Back-up wrench electric cylinder for top drive drilling device

Abstract

The utility model belongs to the technical field of oil exploitation, and mainly relates to a back-up tong electric cylinder for a top drive drilling device, which comprises a shell and two tong heads movably assembled in the shell, and the shell is provided with a through hole; two movable mounting seats and two rack seats are arranged in the shell; the rack seat is slidably assembled with the shell in the front-back direction; the shell is provided with a limiting sliding groove used for limiting the movable installation bases in the left-right direction, the rack bases and the corresponding movable installation bases are assembled in a sliding mode, and the tong heads are connected to the corresponding movable installation bases. A driving gear and a driven gear are arranged in the shell, a driving motor is arranged outside the shell, and the driven gear is meshed with the two rack seats at the same time. The driven gear drives the two rack seats to synchronously move front and back in opposite directions, and the two movable mounting seats provided with the tong heads move in opposite directions relative to the drill rod in the left-right direction, so that synchronous clamping or loosening is achieved.

Description

Technical Field

[0001] The utility model belongs to the field of petroleum exploitation and mainly relates to a back-up electric cylinder for a top drive drilling device. Background Art

[0002] The backup tong of a top-drive drilling rig is a crucial component of the system. It is primarily used to securely clamp the drill pipe during drilling operations, enabling the top drive to connect and disconnect the drill pipe and transmit torque. When tightening or loosening the drill pipe, the backup tong provides reverse clamping force to prevent the drill pipe from rotating or slipping under the action of torque, ensuring safe and stable drilling operations. The backup tong typically features an adjustable clamping mechanism to accommodate drill pipes of varying diameters, and possesses sufficient clamping force and stability to withstand the immense pressure and torque experienced during drilling.

[0003] The existing backup tongs of top drive drilling devices, such as the backup tongs of top drive drilling devices disclosed in the Chinese patent document with authorization publication number CN101424162B, include a backup tong housing and a pair of tong heads consisting of a left tong head and a right tong head, and also include: a tong head floating mounting seat that can move left and right along the housing is arranged inside the backup tong housing; a hydraulic cylinder is installed on one side of the inner cavity of the floating mounting seat, and the hydraulic cylinder floats left and right according to the change of internal oil pressure; the pair of tong heads are respectively connected to the floating mounting seat and the side walls of the hydraulic cylinder. When the backup tongs of the top drive drilling device are made to make and break out, the backup tongs can achieve reliable clamping of the backup tongs and uniform locking force of the left tong head and the right tong head, thereby avoiding the problems of backup tong wear, drill pipe scratches and the need for mechanical straightening.

[0004] However, the backup tongs of the above-mentioned top drive drilling device use hydraulic cylinders on both sides to drive in parallel to achieve the clamping and loosening of the drill pipe. When the loads of the hydraulic cylinders on both sides are unequal, it is easy to cause the drill pipe to be eccentric, affecting the make-up and break-out operations of the drill pipe. Utility Model Content

[0005] The utility model provides a backup tong electric cylinder for a top drive drilling device, which solves the problem in the prior art that the backup tong may cause eccentricity of a drill rod during use.

[0006] In order to solve the above problems, the present invention adopts the following technical solutions:

[0007] A back-up tong electric cylinder for a top-drive drilling device comprises a housing and a left tong head and a right tong head movably assembled in the housing and moving relative to each other, the housing being provided with a through hole which passes through the housing up and down for the drill pipe to pass through; two movable mounting seats, two tong heads for clamping the drill pipe and two rack seats are symmetrically arranged on the radial left and right sides of the through hole in the housing; the rack seat is slidably assembled with the housing in the front-to-back direction; the housing is provided with a limiting slide groove for limiting the movable mounting seat in the left and right directions, the rack seat is slidably assembled with the corresponding movable mounting seat, and the tong heads are connected to the corresponding movable mounting seat; a driving gear and a driven gear which are meshed with each other are rotatably assembled in the housing, a driving motor which is transmission-connected to the driving gear is provided outside the housing, and the driven gear is meshed with the two rack seats at the same time.

[0008] Beneficial effects: the driving motor drives the active gear to rotate, the active gear drives the driven gear to rotate, and the two rack seats symmetrically distributed on the left and right sides of the through hole are engaged with the driven gear at the same time, and the driven gear drives the two rack seats to move back and forth synchronously and in opposite directions. The two movable mounting seats with clamp heads installed move toward each other in the left and right directions relative to the drill rod, realizing synchronous clamping or loosening to solve the problem of eccentricity of the drill rod caused by the back clamp in the prior art during use.

[0009] Furthermore, a first sliding groove extending in the front-to-back direction is provided in the shell, and a first protrusion slidingly engaged with the first sliding groove is provided at the bottom of the rack seat.

[0010] Beneficial effect: The first protrusion and the first sliding groove are slidably matched to ensure the forward and backward sliding path of the rack seat.

[0011] Furthermore, the upper surface of the rack seat is provided with a plurality of second protrusions spaced apart and inclined in the left and right directions, and an inclined second slide groove is formed between any two adjacent second protrusions; the lower surface of the movable mounting seat is provided with a plurality of third protrusions spaced apart and inclined in the left and right directions, and an inclined third slide groove is formed between any two adjacent third protrusions, the inclination angles of the second slide groove, the second protrusion, the third slide groove and the third protrusion are the same, the second protrusion is in sliding cooperation with the third slide groove, and the third protrusion is in sliding cooperation with the second slide groove.

[0012] Beneficial effects: the second obliquely arranged protrusion slides with the third slide groove, the third obliquely arranged protrusion slides with the second slide groove, the rack seat moves forward and backward to drive the required left and right movement of the movable mounting seat, and the structure is simple.

[0013] Furthermore, the inclination angle of the second protrusion does not exceed 5°.

[0014] Beneficial Effect: When the rack seat slides back and forth, it drives the movable mounting base, on which the pliers are mounted, to move left and right. The second protrusion's inclination angle does not exceed 5°, minimizing the pliers' left and right movement distance, facilitating precise control of the pliers' clamping force. This inclination also facilitates mechanical self-locking of the pliers, providing additional safety.

[0015] Furthermore, the driving motor is an explosion-proof planetary servo reduction motor.

[0016] Beneficial Effects: The explosion-proof planetary servo motor features a built-in power-off brake, which instantly applies the brake in the event of a power failure or emergency, ensuring system safety. Furthermore, the explosion-proof planetary servo motor combines a powerful planetary reducer with a highly dynamic synchronous servo reducer, providing high precision and accurate torque. The reducer provides an additional layer of safety by limiting the motor's output speed, mitigating potential hazards caused by high-speed operation. This backup clamp electric cylinder utilizes a mechanical self-locking transmission mechanism and a built-in power-off brake in the explosion-proof planetary servo reducer, achieving "dual redundancy" for electric cylinder braking, providing enhanced safety.

[0017] Furthermore, the clamp head has a V-shaped groove for clamping the drill rod.

[0018] Benefits: V-grooves provide greater clamping force because the force is distributed across two contact points, helping to more securely hold the drill pipe. They also help maintain the drill pipe's center position. V-grooves also accommodate drill pipes of varying diameters, providing increased versatility.

[0019] Furthermore, the output shaft of the driving motor extends in the up-down direction and is fixedly connected to the driving gear.

[0020] Furthermore, the shell includes a left cylinder body and a right cylinder body that are detachably connected together, and two rack seats and two movable mounting seats are respectively installed in the left cylinder body and the right cylinder body.

[0021] Beneficial effect: When parts in the shell are damaged, the left cylinder body and the right cylinder body are disassembled to expose the damaged parts so as to facilitate the repair or replacement of the damaged parts.

[0022] Furthermore, the left cylinder includes a left base and a left connecting portion integrally formed at the end of the left base and spaced apart vertically. The right cylinder includes a right base and a right connecting portion integrally formed at the end of the right base. The right connecting portion is inserted between the two left connecting portions. The left and right connecting portions are provided with coaxially arranged through-holes. The thickness of the left base is the same as that of the right base. The left and right bases are provided with arcuate notches on opposing sides. The two arcuate notches form the through-hole when the left and right cylinders are connected. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0024] Figure 1 This is the main view of the utility model;

[0025] Figure 2 for Figure 1 Cross-sectional view at AA in the middle;

[0026] Figure 3 It is a top view of the utility model;

[0027] Figure 4 This is a structural diagram of the back-up clamp electric cylinder in the clamping state of the utility model;

[0028] Figure 5 Schematic diagram of the structure of the left rack seat (the structure of the right rack seat is the same as that of the left rack seat);

[0029] Figure 6 Schematic diagram of the structure of the left movable mounting base (the structure of the right movable mounting base is the same as that of the left movable mounting base);

[0030] Figure 7 This is a schematic diagram of the assembly of the left movable mounting base, the left clamp head and the left rack base;

[0031] Figure 8 It is the assembly diagram of the left cylinder block and the right cylinder block.

[0032] Description of reference numerals:

[0033] 1. Housing; 2. Machine body; 3. Left cylinder; 4. Right cylinder; 5. Left rack seat; 6. Left movable mounting seat; 7. Right movable mounting seat; 8. First slide; 9. Left clamp head; 10. Driving gear; 11. Driven gear; 12. Right clamp head; 13. Right rack seat; 14. Right spur rack; 15. Right base; 16. Through hole; 17. Left spur rack; 18. Drill rod; 19. Right connecting part; 20. Left base; 21. Through hole; 22. Second protrusion; 23. Second slide; 24. Third protrusion; 25. Third slide; 26. First protrusion; 27. V-shaped groove; 28. Left connecting part. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0035] The following describes various non-limiting embodiments of the present invention. The numbers of any elements in the accompanying drawings are for illustrative purposes only and are not intended to be limiting. Any nomenclature is provided for distinction only and does not have any limiting meaning. It should be noted that the embodiments and features of the embodiments of the present invention may be combined with one another unless there is a conflict.

[0036] Embodiment 1 of the backup tong electric cylinder for a top drive drilling device of the present invention:

[0037] like Figure 1 and Figure 2 As shown, a backup tong electric cylinder for a top drive drilling rig includes a housing 1 and a body 2 connected together, wherein the housing 1 is provided with a left tong head 9, a right tong head 12, a left movable mounting seat 6, a right movable mounting seat 7, a left rack seat 5, a right rack seat 13 and a driven gear 11; the body 2 includes an outer shell and a drive motor arranged in the outer shell.

[0038] like Figure 2 and Figure 8 As shown, the shell 1 includes a left cylinder body 3 and a right cylinder body 4, which are connected together to form an arc-shaped cavity inside. The left cylinder body 3 and the right cylinder body 4 are placed up and down. The left cylinder body 3 includes a left base body 20 and a left connecting portion 28 integrally formed at the end of the left base body 20 and arranged at intervals up and down. The right cylinder body 4 includes a right base body 15 and a right connecting portion 19 integrally formed at the end of the right base body 15. The thickness of the left base body 20 is the same as that of the right base body 15. Arc-shaped notches are respectively provided on the opposite sides of the left base body 20 and the right base body 15. The two arc-shaped notches form a through hole 16 after the left cylinder body 3 and the right cylinder body 4 are connected to allow the drill rod 18 to pass through. There are two left connecting parts 28 and one right connecting part 19. The right connecting part 19 is inserted between the two left connecting parts 28. The two left connecting parts 28 and the right connecting part 19 are provided with coaxially arranged through-holes 21. The housing 1 is provided with fastening bolts, which are inserted through the through-holes 21 in the two left connecting parts 28 and the right connecting part 19. The tail of the fastening bolt has a fastening nut to secure the connection. If a part in the housing 1 is damaged, the left cylinder body 3 and the right cylinder body 4 can be disassembled by unscrewing the fastening nut to expose the damaged part, thereby facilitating repair or replacement of the damaged part.

[0039] like Figure 1 、 Figure 2 and Figure 3 As shown, the driven gear 11 is located in the housing 1, and the driven gear 11 is coaxial with the above-mentioned through hole 16. The drive motor is an explosion-proof planetary servo reduction motor. The explosion-proof planetary servo reduction motor is provided with a power-off brake. In the event of a power failure or emergency, the power-off brake can immediately apply the brake to ensure the safety of the system. The explosion-proof planetary servo reduction motor combines a powerful planetary reducer and a high-dynamic synchronous servo reduction motor, providing high precision and correct torque. The reducer can provide an additional layer of safety by limiting the output speed of the motor to reduce the potential dangers caused by high-speed operation. The body 2 is located above the left cylinder body 3, and the body 2 is connected to the left cylinder body 3 in the upper and lower directions. The drive motor is located in the body 2. The explosion-proof planetary servo reduction motor is a prior art and will not be described in detail here. The output shaft of the drive motor extends in the upper and lower directions and is connected to the driving gear 10. The driving gear 10 is engaged with the above-mentioned driven gear 11. When the drive motor rotates, the driving gear 10 drives the driven gear 11 to rotate. The inner side of the driven gear 11 is connected to a rotating bearing, and a hollow cylinder is connected inside the rotating bearing. The lower end of the hollow cylinder is connected to the lower wall of the shell 1. The inner diameter of the hollow cylinder is the same as the diameter of the above-mentioned through hole 16, and the diameter of the through hole 16 is larger than the diameter of the drill rod 18.

[0040] like Figure 2 、 Figure 5 、 Figure 7 and Figure 8 As shown, the left rack seat 5 and the right rack seat 13 are respectively disposed in the left cylinder body 3 and the right cylinder body 4 in a radially symmetrical manner about the through hole 16. The bottoms of the left cylinder body 3 and the right cylinder body 4 are each provided with a first slide groove 8 in the front-to-back direction. The bottoms of the left rack seat 5 and the right rack seat 13 are respectively connected to first protrusions 26 corresponding to the corresponding first slide grooves 8. The first protrusions 26 in the left cylinder body 3 slide in conjunction with the corresponding first slide grooves 8, and the first protrusions 26 in the right cylinder body 4 slide in conjunction with the corresponding first slide grooves 8. The inner sides of the left rack seat 5 and the right rack seat 13 are respectively provided with a left spur rack 17 and a right spur rack 14. The left spur rack 17 and the right spur rack 14 are radially symmetrical about the through hole 16. The left spur rack 17 and the right spur rack 14 are both meshed with the above-mentioned driven gear 11. The driven gear 11 rotates to drive the left rack seat 5 and the right rack seat 13 to slide synchronously and oppositely back and forth in the corresponding first slide grooves 8.

[0041] like Figure 5 、 Figure 6 and Figure 7As shown, the upper surfaces of both rack seats are provided with a plurality of second protrusions 22 spaced apart and arranged obliquely in the left-right direction, with an obliquely arranged second chute 23 formed between any two adjacent second protrusions 22. The lower surface of the movable mounting seat is provided with a plurality of third protrusions 24 spaced apart and arranged obliquely in the left-right direction, with an obliquely arranged third chute 25 formed between any two adjacent third protrusions 24. The second chute 23, second protrusions 22, third chute 25, and third protrusion 24 have the same inclination angle, and the inclination angle does not exceed 5°. This reduces the left and right movement distance of the left and right clamp heads 9 and 12, facilitating precise control of the clamp head clamping force. Furthermore, this inclination angle is less than the static friction angle of the material. This back-up clamp electric cylinder can achieve mechanical self-locking of the transmission mechanism to provide additional safety. This back-up clamp electric cylinder utilizes mechanical self-locking of the transmission mechanism and a built-in power-off brake in the explosion-proof servo motor to achieve "dual redundancy" in the electric cylinder braking safety, providing higher safety. The second protrusion 22 slides in cooperation with the third slide groove 25, and the third protrusion 24 slides in cooperation with the second slide groove 23. The left rack seat 5 and the right rack seat 13 slide back and forth synchronously in the corresponding limit slide grooves, driving the left movable mounting seat 6 and the right movable mounting seat 7 to slide left and right synchronously in the corresponding slide grooves.

[0042] like Figure 2 、 Figure 4 and Figure 7 As shown, the tops of the left and right cylinder bodies 3 and 4 are provided with first and second limiting grooves along the left and right directions. The top of the left movable mounting seat slides in engagement with the first limiting groove, while the top of the right movable mounting seat slides in engagement with the second limiting groove. The left and right clamp heads 9 and 12 are respectively disposed in the left and right symmetrical positions radially relative to the through hole 16. The left cylinder body 3 is fixedly connected to the outer groove of the left clamp head 9, while the right cylinder body 4 is fixedly connected to the outer groove of the right clamp head 12. Both the left and right clamp heads 9 and 12 have V-shaped grooves 27 for clamping the drill rod 18, with both V-shaped grooves 27 facing the direction of the inner through hole 16. The left and right movable mounting seats 6 and 7 respectively slide synchronously and oppositely in their corresponding grooves, driving the left and right clamp heads 9 and 12 to move synchronously and oppositely to clamp and release the drill rod 18. The V-groove 27 provides greater clamping force because the clamping force is distributed across two contact points, helping to more securely hold the drill rod. Furthermore, the V-groove 27 maintains the drill rod's center position. The V-groove 27 is also adaptable to drill rods of varying diameters, making it highly versatile.

[0043] The working process of this utility model is as follows:

[0044] After the explosion-proof planetary servo reduction motor receives the power supply and signal input by the system, it runs forward and reverse at a certain speed, driving the driving gear 10 to rotate forward and reverse, and the driving gear 10 drives the driven gear 11 to rotate forward and reverse, and the driven gear 11 drives the left rack seat 5 and the right rack seat 13 to slide back and forth synchronously in the opposite direction. The left rack seat 5 and the right rack seat 13 slide back and forth synchronously in the opposite direction, driving the left movable mounting seat 6 on which the left clamp head 9 is installed and the right movable mounting seat 7 on which the right clamp head 12 is installed to move left and right synchronously in the opposite direction, thereby realizing the clamping and loosening of the drill rod 18.

[0045] The two rack seats symmetrically distributed on the radial left and right sides of the through hole 16 are engaged with the driven gear 11 at the same time. The driven gear 11 drives the two rack seats to move synchronously and in opposite directions. The two movable mounting seats with clamp heads installed move toward each other in the left and right directions relative to the drill rod 18 to achieve synchronous clamping or loosening with high synchronization accuracy, avoiding the previous phenomenon that the drill rod 18 of the back clamp cylinder is prone to eccentricity, thereby improving the reliability and efficiency of the make-up and break-out operations.

[0046] Embodiment 2 of the backup tong electric cylinder for a top drive drilling device of the present invention:

[0047] The main difference between this embodiment and Example 1 is that, in Example 1, the output shaft of the drive motor extends in the vertical direction and is directly connected to the driving gear, which meshes with the aforementioned driven gear. In this embodiment, a transmission structure can be provided between the output shaft of the drive motor and the driving gear. For example, if the output shaft of the drive motor is arranged horizontally, since the axis of the driving gear extends in the vertical direction, in this case, bevel gears that mesh with each other can be provided between the transmission shaft of the driving gear and the output shaft of the drive motor.

[0048] Embodiment 3 of the backup tong electric cylinder for a top drive drilling device of the present invention:

[0049] The main difference between the present invention and embodiment 1 is that: in embodiment 1, the tongs have a V-shaped groove for clamping the drill rod. In this embodiment, an arc groove for clamping the drill rod can also be provided on the tongs.

[0050] Embodiment 4 of the backup tong electric cylinder for a top drive drilling device of the present invention:

[0051] The main difference between this embodiment and Example 1 is that, in Example 1, the housing includes a left cylinder body and a right cylinder body that are detachably connected. The left and right cylinder bodies are connected to form an arc-shaped cavity, and the two rack seats and two movable mounting seats are installed in the arc-shaped cavity. In this embodiment, a structure in which the top cover and the base are connected can also be adopted. The base has an inner cavity, and the two rack seats and two movable mounting seats are all disposed within the inner cavity. Both the base and the top cover are provided with through holes for the drill rod to pass through.

Claims

1. A back-up electric cylinder for a top drive drilling rig, comprising a housing and two clamp heads movably assembled in the housing and capable of relative motion, characterized in that: The housing is provided with a through hole that passes through the housing vertically for the drill rod to pass through; Two movable mounting seats and two rack seats are symmetrically arranged on the left and right sides of the through hole in the shell, and the two clamp heads are symmetrically arranged on the left and right sides of the through hole; The rack seat is slidably assembled with the housing in the front-to-back direction; a limiting slide groove is provided on the housing for limiting the movable mounting seat in the left-right direction, the rack seat is slidably assembled with the corresponding movable mounting seat, and the pliers head is connected to the corresponding movable mounting seat; A driving gear and a driven gear that mesh with each other are rotatably assembled in the shell, a driving motor that is transmission-connected to the driving gear is provided outside the shell, and the driven gear meshes with the two rack seats at the same time.

2. The backup tong electric cylinder for a top drive drilling rig according to claim 1, characterized in that: A first sliding groove extending in the front-to-back direction is provided in the shell, and a first protrusion slidingly matched with the first sliding groove is provided at the bottom of the rack seat.

3. The backup tong electric cylinder for a top drive drilling rig according to claim 1, characterized in that: A plurality of second protrusions are provided on the upper surface of the rack seat and are spaced apart and arranged obliquely in the left-right direction, and a second inclined slide groove is formed between any two adjacent second protrusions; a plurality of third protrusions are provided on the lower surface of the movable mounting seat and are spaced apart and arranged obliquely in the left-right direction, and a third inclined slide groove is formed between any two adjacent third protrusions, the inclination angles of the second slide groove, the second protrusion, the third slide groove and the third protrusion are the same, the second protrusion is slidably matched with the third slide groove, and the third protrusion is slidably matched with the second slide groove.

4. The backup tong electric cylinder for a top drive drilling rig according to claim 3, characterized in that: The inclination angle of the second protrusion does not exceed 5°.

5. The backup tong electric cylinder for a top drive drilling rig according to claim 1, characterized in that: The driving motor is an explosion-proof planetary servo reduction motor.

6. The backup tong electric cylinder for a top drive drilling rig according to any one of claims 1 to 5, characterized in that: The tongs head is provided with a V-shaped groove for clamping a drill rod.

7. The backup tong electric cylinder for a top drive drilling rig according to any one of claims 1 to 5, characterized in that: The output shaft of the driving motor extends in the up-down direction and is fixedly connected to the driving gear.

8. The backup tong electric cylinder for a top drive drilling rig according to any one of claims 1 to 5, characterized in that: The shell comprises a left cylinder body and a right cylinder body which are detachably connected together, and two rack seats and two movable mounting seats are respectively mounted in the left cylinder body and the right cylinder body.

9. The backup tong electric cylinder for a top drive drilling rig according to claim 8, characterized in that: The left cylinder body includes a left base body and a left connecting part integrally formed at the end of the left base body and spaced apart in an upper and lower manner; the right cylinder body includes a right base body and a right connecting part integrally formed at the end of the right base body; the right connecting part is inserted between the two left connecting parts; the left connecting part and the right connecting part are provided with coaxially arranged through holes; the thickness of the left base body is the same as that of the right base body; arc-shaped notches are respectively provided on opposite sides of the left base body and the right base body, and the two arc-shaped notches form the through hole after the left cylinder body and the right cylinder body are connected.

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