Novel top drive back-up wrench

Abstract

The utility model relates to the technical field of top drive back-up tongs, and provides a novel top drive back-up tong which is used for providing clamping and positioning for a protection connector when a top drive body and the protection connector are buckled upwards and downwards and comprises a back-up tong shell, a pushing piece and a tong tooth base. The back-up tong shells are detachably and slidably installed on the pushing piece, the tong tooth bases are detachably and slidably installed on the pushing piece, the back-up tong shells, the pushing piece and the tong tooth bases are arranged in pairs, the two back-up tong shells are detachably buckled, a clamping space is formed between the two back-up tong shells and used for containing a protection connector, and after the pushing piece slides, the pushing piece is used for providing force for the two tong tooth bases to be close to the protection connector; the clamping space penetrates through the back-up tong shell, and the tong tooth base enters or breaks away from the clamping space after sliding and is used for being installed on the pushing piece or detached from the pushing piece. According to the technical scheme, the technical problem that the whole back-up wrench needs to be disassembled when the wrench tooth seat is replaced in the prior art is solved.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the field of top drive back clamp technology, and more specifically, to a novel top drive back clamp. Background Technology

[0002] In oil drilling operations, the top drive back clamp is a crucial piece of equipment. Its main function is to provide clamping and positioning during the engagement and disengagement of the top drive body and the protective connector. The protective connector is used to install the drill pipe, thus ensuring the stability of the drill pipe connection. Most top drive back clamps on the market currently adopt a two-part snap-fit ​​structure, which to some extent meets basic operational requirements.

[0003] However, existing top drive back clamps have significant drawbacks. During prolonged use, the internal jaw seats are prone to wear due to frequent contact with the drill pipe, requiring the entire back clamp to be disassembled when replacing the jaw seats. This involves disassembling and reassembling multiple components, a time-consuming and labor-intensive process. Furthermore, because the back clamp operates in harsh environments, over time it may become difficult to open properly, hindering the quick replacement of the jaw seats.

[0004] Therefore, developing a top-drive back clamp that allows for easy replacement of the clamp holder is of significant practical importance. Utility Model Content

[0005] To overcome the above-mentioned defects, the embodiments of this disclosure provide a novel top-drive back clamp, which solves the technical problem in the related art that the entire back clamp needs to be disassembled to replace the clamp jaw seat.

[0006] According to one aspect, at least one embodiment of this disclosure provides a novel top drive back clamp for providing clamping and positioning for the protective connector when the top drive body is engaged and disengaged from the protective connector. The clamp includes a back clamp housing, a pusher, and clamp jaws. The pusher is slidably disposed within the back clamp housing, and the clamp jaws are detachably slidably mounted on the pusher. The back clamp housing, the pusher, and the clamp jaws are all arranged in pairs. The two back clamp housings are detachably engaged, forming a clamping space between them. The clamping space is used to accommodate the protective connector. After the pusher slides, it provides a force to bring the two clamp jaws closer to the protective connector.

[0007] The clamping space extends through the back clamp housing, and the jaw seat slides into or out of the clamping space for installation onto or removal from the pusher.

[0008] For example, a novel top-drive back clamp provided in at least one embodiment of this disclosure further includes:

[0009] The jaw holder has a mounting part, and the pusher has a mounting groove. After the jaw holder slides into the clamping space, the mounting part is used to engage with the mounting groove.

[0010] For example, a novel top-drive back clamp provided in at least one embodiment of this disclosure further includes:

[0011] It also includes a fixed base, a mounting sleeve, and a connecting arm. The fixed base is located above the back clamp housing. The mounting sleeve is detachably mounted on the fixed base. The bottom end of the connecting arm is mounted on the back clamp housing, and the top end slides within the mounting sleeve.

[0012] For example, a novel top-drive back clamp provided in at least one embodiment of this disclosure further includes:

[0013] It also includes a guide rod, a spring seat, and a spring body. The guide rod is disposed inside the mounting sleeve, the spring seat is disposed on the guide rod, the top end of the connecting arm is slidably disposed on the guide rod, and the two ends of the spring body act on the connecting arm and the spring seat respectively to provide a force for the connecting arm to slide into the mounting sleeve.

[0014] For example, a novel top-drive back clamp provided in at least one embodiment of this disclosure further includes:

[0015] It also includes a limiting member, which is disposed inside the mounting sleeve. The connecting arm has a limiting groove, and after the connecting arm slides, it is used to make the groove wall of the limiting groove abut against the limiting member.

[0016] For example, a novel top-drive back clamp provided in at least one embodiment of this disclosure further includes:

[0017] The top of the mounting sleeve and the fixed base each have two through connecting pin holes, and also include two connecting pins, which are detachably inserted into the two connecting pin holes respectively, for connecting the mounting sleeve and the fixed base.

[0018] The mounting sleeve has a fixed state and an avoidance state. In the fixed state, two connecting pins are installed to position the mounting sleeve above the wellhead. In the avoidance state, one connecting pin is installed to allow the mounting sleeve to swing and avoid the position above the wellhead.

[0019] For example, a novel top-drive back clamp provided in at least one embodiment of this disclosure further includes:

[0020] Both of the back clamp housings have through locking pin holes and also include locking pin shafts, which pass through the locking pin holes on both back clamp housings to connect the two back clamp housings.

[0021] For example, a novel top-drive back clamp provided in at least one embodiment of this disclosure further includes:

[0022] It also includes a jaw body, the jaw seat having a jaw groove, the jaw body being disposed within the jaw groove for abutting against the protective connector.

[0023] For example, a novel top-drive back clamp provided in at least one embodiment of this disclosure further includes:

[0024] It also includes a straightening sleeve, which is detachably mounted on the back clamp housing and located above the clamping space. The straightening sleeve is used to contact the protective connector.

[0025] For example, a novel top-drive back clamp provided in at least one embodiment of this disclosure further includes:

[0026] The inner wall of the mounting sleeve has a wear-resistant layer, and the connecting arm contacts the wear-resistant layer.

[0027] The beneficial effects of the embodiments disclosed herein are as follows:

[0028] In this disclosure, when it is necessary to replace the jaw holder, it is no longer necessary to disassemble the entire back jaw housing, because the jaw holder and the pusher are detachably slidably connected, and the clamping space is through the back jaw housing. Therefore, the operator can directly reach into the clamping space, remove the worn jaw holder from the pusher, detach it from the clamping space, and then install a new jaw holder to complete the replacement process.

[0029] Even if the back clamps work for extended periods in harsh environments and become difficult to open, it does not affect the replacement of the jaw holders. Because it is not necessary to open the entire back clamp, the jaw holders can be replaced simply by reaching into the clamping space, effectively solving the problem in existing technologies where the jaw holders cannot be quickly replaced due to the difficulty in opening the back clamps. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.

[0031] Figure 1 This is a schematic diagram of the external shape of a novel top-drive back clamp in one embodiment of the present disclosure;

[0032] Figure 2 for Figure 1 A schematic diagram of the back clamp housing in the embodiment;

[0033] Figure 3 for Figure 2 Enlarged view at point B in the middle;

[0034] Figure 4 for Figure 2 A cross-sectional view along the AA direction;

[0035] Figure 5 for Figure 1 A schematic diagram of the jaw holder in the embodiment;

[0036] Figure 6 for Figure 1 The internal structure diagram of the mounting sleeve in the embodiment is shown.

[0037] In the diagram: 1. Top drive body, 2. Protective connector, 3. Back clamp housing, 4. Pushing component, 5. Jaw seat, 6. Clamping space, 7. Mounting part, 8. Mounting groove, 9. Fixing seat, 10. Mounting sleeve, 11. Connecting arm, 12. Guide rod, 13. Spring seat, 14. Spring body, 15. Limiting component, 16. Limiting groove, 17. Connecting pin hole, 18. Connecting pin shaft, 19. Locking pin hole, 20. Locking pin shaft, 21. Jaw body, 22. Jaw groove, 23. Straightening sleeve, 24. Mounting seat, 25. Pin hole, 26. Countersunk groove, 27. Fixing pin, 28. Oil pipe, 29. Receiving groove. Detailed Implementation

[0038] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.

[0039] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0040] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0041] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0043] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0044] like Figures 1-6 As shown, a novel top-drive back clamp in one embodiment of this disclosure is provided for clamping and positioning the protective connector 2 when the top drive body 1 is engaged and disengaged with the protective connector 2. The clamp includes a back clamp housing 3, a pusher 4, and a jaw seat 5. The pusher 4 is slidably disposed within the back clamp housing 3, and the jaw seat 5 is detachably slidably mounted on the pusher 4. The back clamp housing 3, the pusher 4, and the jaw seat 5 are all arranged in pairs. The two back clamp housings 3 are detachably engaged and a clamping space 6 is formed between them. The clamping space 6 is used to accommodate the protective connector 2. After the pusher 4 slides, it provides a force for the two jaw seats 5 to approach the protective connector 2.

[0045] The clamping space 6 extends through the back clamp housing 3. The jaw seat 5 slides into or out of the clamping space 6 for installation onto or removal from the pusher 4.

[0046] For example, such as Figures 1-6 As shown, during the upper and lower clamping operations of the top drive body 1 and the protective connector 2, the paired back clamp housings 3 are first clamped around the protective connector 2, at which point the clamping space 6 accommodates the protective connector 2. After the equipment is started, the pusher 4 begins to slide within the back clamp housing 3. Since the jaw seat 5 is mounted on the pusher 4, the sliding of the pusher 4 causes the jaw seat 5 to tightly grip the protective connector 2, providing a stable clamping position for the protective connector 2, so as to smoothly perform the upper and lower clamping operations. The so-called upper and lower clamping refers to assembly and disassembly.

[0047] The pusher 4 is preferably a piston, which is sealed and slidably disposed within the back clamp housing 3, and slides by being supplied with hydraulic oil through the oil pipe 28. See [link to relevant documentation]. Figure 1 The oil pipe 28 is connected to the piston chamber where the piston is located. The outer surface of the back clamp housing 3 also has a receiving groove 29 to hide and receive the oil pipe 28, so as to prevent the oil pipe 28 from contacting and hitting other parts during operation and causing damage.

[0048] When it is necessary to replace the jaw holder 5, it is no longer necessary to disassemble the entire back jaw housing 3, because the jaw holder 5 and the pusher 4 are detachably slidably connected, and the clamping space 6 is through the back jaw housing 3. Therefore, the operator can directly put his hand into the clamping space 6, remove the worn jaw holder 5 from the pusher 4, detach it from the clamping space 6, and then install the new jaw holder 5 to complete the replacement process.

[0049] Even if the back clamps work for extended periods in harsh environments and become difficult to open, it does not affect the replacement of the jaw holder 5. This is because it is not necessary to open the entire back clamp; simply reaching into the clamping space 6 to replace the jaw holder 5 effectively solves the problem in existing technologies where the jaw holder 5 cannot be quickly replaced due to the difficulty in opening the back clamps.

[0050] In some examples, the jaw holder 5 has a mounting portion 7 and the pusher 4 has a mounting groove 8. After the jaw holder 5 slides into the clamping space 6, the mounting portion 7 is used to engage with the mounting groove 8.

[0051] For example, such as Figure 5 As shown, the jaw clamp 5 has a dovetail-shaped mounting portion 7, and the pusher 4 has a matching dovetail-shaped mounting groove 8. When installing a new jaw clamp 5, the dovetail-shaped mounting portion 7 gradually engages with the dovetail-shaped mounting groove 8 until they are fully fitted, ensuring the stability of the jaw clamp 5 during operation. Both the mounting portion 7 and the mounting groove 8 adopt a dovetail-shaped cross-section, which increases the stability of the installation. The dovetail structure provides constraint from multiple directions during engagement, preventing the jaw clamp 5 from loosening or shifting during operation.

[0052] In some examples, a fixing base 9, a mounting sleeve 10, and a connecting arm 11 are also included. The fixing base 9 is located above the back clamp housing 3. The mounting sleeve 10 is detachably mounted on the fixing base 9. The bottom end of the connecting arm 11 is mounted on the back clamp housing 3, and the top end slides within the mounting sleeve 10.

[0053] In some examples, a guide rod 12, a spring seat 13, and a spring body 14 are also included. The guide rod 12 is disposed inside the mounting sleeve 10, the spring seat 13 is disposed on the guide rod 12, the top end of the connecting arm 11 is slidably disposed on the guide rod 12, and the two ends of the spring body 14 act on the connecting arm 11 and the spring seat 13 respectively to provide a force for the connecting arm 11 to slide into the mounting sleeve 10.

[0054] For example, such as Figure 6 As shown, during the actual operation of the top-drive back clamp, the clamp housing 3 may move vertically due to various external forces. The fixing base 9 is located above the clamp housing 3, and the mounting sleeve 10 is detachably mounted on the fixing base 9, providing the mounting foundation for the entire structure. The connecting arm 11 is mounted on the clamp housing 3, and its top end is located inside the mounting sleeve 10, and can slide on the guide rod 12.

[0055] See Figure 6 The mounting sleeve 10 is provided with a mounting base 24. The side wall of the mounting sleeve 10 is provided with at least two pin holes 25. The mounting base 24 is also designed with a countersunk groove 26 corresponding to the pin holes 25. The fixing pin 27 can be inserted into the pin holes 25 and the countersunk groove 26 to fix the mounting base 24 in the mounting sleeve 10. The top end of the guide rod 12 can be fixedly set on the mounting base 24 to achieve a stable connection of the guide rod 12.

[0056] Initially, the spring body 14 is in a pre-compressed state, applying a force to the connecting arm 11 to slide into the mounting sleeve 10. When the back clamp housing 3 moves upward, the connecting arm 11 moves upward along with the back clamp housing 3. At this time, the spring body 14 gradually changes from a pre-compressed state to a relaxed state. During this process, the spring body 14 absorbs part of the energy generated by the upward movement of the back clamp housing 3, playing a buffering role. When the back clamp housing 3 moves downward, the connecting arm 11 moves downward accordingly, causing the spring body 14 to be further compressed, thereby achieving buffering and reducing the rigid impact experienced by the back clamp during operation.

[0057] In some examples, a limiting member 15 is also included, which is disposed within the mounting sleeve 10. The connecting arm 11 has a limiting groove 16, which, when slid, causes the groove wall of the limiting groove 16 to abut against the limiting member 15.

[0058] For example, such as Figure 6As shown, during operation, the connecting arm 11 slides along the guide rod 12 within the mounting sleeve 10 as the back clamp housing 3 moves up and down. A limiting member 15 is installed within the mounting sleeve 10, and the connecting arm 11 has an arc-shaped limiting groove 16. When the back clamp housing 3 moves downwards, the connecting arm 11 also slides downwards. If the connecting arm 11 slides too low, i.e., the downward floating stroke of the back clamp housing 3 is too long, the groove wall of the limiting groove 16 will abut against the limiting member 15. Because the limiting groove 16 is arc-shaped, it can contact the limiting member 15 with a large contact area during the abutment process, limiting the up and down floating stroke of the back clamp housing 3 and preventing instability in the back clamp operation due to excessive stroke, or damage to other components.

[0059] In some examples, the top end of the mounting sleeve 10 and the fixing seat 9 each have two through connecting pin holes 17, and also include two connecting pins 18, which are detachably inserted into the two connecting pin holes 17 respectively, for connecting the mounting sleeve 10 and the fixing seat 9.

[0060] The mounting sleeve 10 has a fixed state and an avoidance state. In the fixed state, two connecting pins 18 are installed to position the mounting sleeve 10 above the wellhead. In the avoidance state, one connecting pin 18 is installed to allow the mounting sleeve 10 to swing and avoid the position above the wellhead.

[0061] For example, such as Figure 2 As shown, during the upper and lower connection operations of the top drive body 1 and the protective connector 2, two connecting pins 18 are inserted into two connecting pin holes 17 respectively, connecting the mounting sleeve 10 and the fixed seat 9. At this time, the mounting sleeve 10 is in a fixed state, and the back clamp housing 3 is stably positioned above the wellhead, continuously aligned with the wellhead. When the top drive body 1 and the protective connector 2 begin to assemble, the back clamp provides clamping and positioning for the protective connector 2 through its own structure, facilitating the smooth progress of the upper and lower connection operations.

[0062] After the top drive body 1 and the protective connector 2 are initially assembled, one of the connecting pins 18 can be removed to make room for further operations. At this time, the mounting sleeve 10 changes from a fixed state to a clearance state. Due to the removal of the constraint of one connecting pin 18, the mounting sleeve 10 can swing around the remaining connecting pin 18. As the mounting sleeve 10 swings, the back clamp housing 3 connected to it also swings, thereby avoiding the position above the wellhead and providing sufficient operating space for other operations to be carried out at the wellhead.

[0063] By simply disassembling and installing the connecting pin 18, the installation sleeve 10 can be switched between a fixed state and a clearance state, which meets the space requirements of different stages in the assembly process of the top drive body 1 and the protective joint 2, making the entire drilling operation process more reasonable and efficient, and improving the versatility and applicability of the top drive back tongs.

[0064] In some examples, both back clamp housings 3 have through locking pin holes 19 and also include locking pin shafts 20, which pass through the locking pin holes 19 on both back clamp housings 3 to connect the two back clamp housings 3.

[0065] For example, such as Figure 1 and Figure 4 As shown, when the two back clamp housings 3 are engaged, the locking pin holes 19 on the two back clamp housings 3 are aligned, and the locking pin shaft 20 passes through the locking pin holes 19 of the two back clamp housings 3 simultaneously. In this way, the two back clamp housings 3 are tightly connected together by the locking pin shaft 20, forming a stable clamping structure, which effectively prevents separation due to external forces during operation and ensures that the clamping and positioning of the back clamps on the protective connector 2 is stable and reliable.

[0066] In some examples, a jaw body 21 is also included, wherein the jaw seat 5 has a jaw groove 22, and the jaw body 21 is disposed in the jaw groove 22 for abutting against the protective connector 2.

[0067] For example, such as Figures 2-4 As shown, multiple jaws 21 work together from different directions to achieve a tight clamping of the protective connector 2, thereby providing a stable counter torque for the upper and lower clamping operations of the top drive body 1 and the protective connector 2, ensuring smooth operation.

[0068] The jaw body 21 is installed in the jaw groove 22, which provides a more concentrated and effective clamping force when clamping the protective connector 2, ensuring that the protective connector 2 will not loosen or shift during operation. When the jaw body 21 is worn or damaged due to long-term use, it can be simply removed from the jaw groove 22 for replacement without disassembling the entire jaw seat 5 or the back clamp.

[0069] In some examples, a straightening sleeve 23 is also included, which is detachably mounted on the back clamp housing 3 and located above the clamping space 6. The straightening sleeve 23 is used to contact the protective connector 2.

[0070] For example, such as Figure 2 and Figure 3As shown, the main function of the straightening sleeve 23 is to ensure the alignment of the protective connector 2, so that the protective connector 2 is always in the ideal center position throughout the operation, avoiding problems such as inaccurate connection, improper upper or lower locking caused by the offset of the protective connector 2, reducing the shaking and displacement of the protective connector 2 during operation, and improving the accuracy and quality of the operation.

[0071] In some examples, the inner wall of the mounting sleeve 10 has a wear-resistant layer, and the connecting arm 11 contacts the wear-resistant layer.

[0072] For example, such as Figure 6 As shown, a wear-resistant layer is provided on the inner wall of the mounting sleeve 10, and the connecting arm 11 is always in contact with the wear-resistant layer during sliding. The wear-resistant layer has a good surface finish and a low coefficient of friction, which makes the sliding of the connecting arm 11 within the mounting sleeve 10 smoother. The wear-resistant layer reduces the wear of the mounting sleeve 10, thereby reducing the frequency of equipment maintenance and replacement.

[0073] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. A novel top drive back clamp, used to provide clamping and positioning for the protective connector (2) when the top drive body (1) is engaged and disengaged from the protective connector (2), characterized in that, The device includes a back clamp housing (3), a pusher (4), and a jaw seat (5). The pusher (4) is slidably disposed within the back clamp housing (3), and the jaw seat (5) is detachably slidably mounted on the pusher (4). The back clamp housing (3), the pusher (4), and the jaw seat (5) are all arranged in pairs. The two back clamp housings (3) are detachably fastened together, and a clamping space (6) is formed between them. The clamping space (6) is used to accommodate the protective connector (2). After the pusher (4) slides, it is used to provide a force for the two jaw seats (5) to approach the protective connector (2). The clamping space (6) extends through the back clamp housing (3), and the jaw seat (5) slides into or out of the clamping space (6) for installation onto or removal from the pusher (4).

2. A new top drive back tongs according to claim 1, characterized in that, The jaw holder (5) has a mounting part (7), and the pusher (4) has a mounting groove (8). After the jaw holder (5) slides into the clamping space (6), the mounting part (7) is used to engage with the mounting groove (8).

3. A new type of top drive back tongs according to claim 1, characterized in that, It also includes a fixing seat (9), a mounting sleeve (10) and a connecting arm (11). The fixing seat (9) is located above the back clamp housing (3). The mounting sleeve (10) is detachably mounted on the fixing seat (9). The bottom end of the connecting arm (11) is mounted on the back clamp housing (3), and the top end slides inside the mounting sleeve (10).

4. A new type of top drive back tongs according to claim 3, characterized in that, It also includes a guide rod (12), a spring seat (13) and a spring body (14). The guide rod (12) is located inside the mounting sleeve (10), the spring seat (13) is located on the guide rod (12), the top end of the connecting arm (11) is slidably located on the guide rod (12), and the two ends of the spring body (14) act on the connecting arm (11) and the spring seat (13) respectively to provide the force for the connecting arm (11) to slide into the mounting sleeve (10).

5. A new type of top drive back tongs according to claim 4, characterized in that, It also includes a limiting member (15), which is located inside the mounting sleeve (10). The connecting arm (11) has a limiting groove (16). After the connecting arm (11) slides, it is used to make the groove wall of the limiting groove (16) abut against the limiting member (15).

6. A new type of top drive back tongs according to claim 5, characterized in that, The top of the mounting sleeve (10) and the fixed base (9) each have two through connecting pin holes (17), and also include connecting pin shafts (18). There are two connecting pin shafts (18), which are detachably inserted into the two connecting pin holes (17) respectively, for connecting the mounting sleeve (10) and the fixed base (9). The mounting sleeve (10) has a fixed state and an avoidance state. In the fixed state, two connecting pins (18) are installed to position the mounting sleeve (10) above the wellhead. In the avoidance state, one connecting pin (18) is installed to allow the mounting sleeve (10) to swing and avoid the position above the wellhead.

7. A new type of top drive back tongs according to claim 1, characterized in that, Both of the back clamp housings (3) have through locking pin holes (19) and also include locking pin shafts (20), which pass through the locking pin holes (19) on both back clamp housings (3) to connect the two back clamp housings (3).

8. A new top drive back tongs according to claim 1, characterized by, It also includes a jaw body (21), the jaw seat (5) has a jaw groove (22), the jaw body (21) is disposed in the jaw groove (22) and is used to abut against the protective connector (2).

9. A new type of top drive back tongs according to claim 1, characterized in that, It also includes a straightening sleeve (23), which is detachably mounted on the back clamp housing (3) and located above the clamping space (6). The straightening sleeve (23) is used to contact the protective connector (2).

10. A new type of top drive back tongs according to claim 3, characterized in that, The inner wall of the mounting sleeve (10) has a wear-resistant layer, and the connecting arm (11) contacts the wear-resistant layer.

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