Power head slip assembly

Abstract

The utility model discloses a power head slip assembly which is arranged in a power head and comprises a slip, a taper snap ring and a power piece, the taper snap ring is sleeved on a main shaft of the power head, one side of the taper snap ring close to the main shaft is provided with a chute, the slip is arranged on the shaft wall of the main shaft in a penetrating mode, and the slip is limited in the axial direction of the main shaft. The slip is provided with a clamping face for clamping a drill rod and an inclined face connected with the inclined groove in a sliding mode, and the power piece provides force for the taper clamping ring to slide in the axial direction of the main shaft. By means of the design, the power piece drives the taper clamping ring to move in the axial direction of the main shaft, the inclined faces of the slips slide relative to the inclined grooves, and due to the fact that the slips are limited in the axial direction of the main shaft, sliding of the inclined faces and the inclined grooves is converted into movement of the slips in the radial direction of the main shaft. The slips can slightly move in the axial direction of the main shaft due to the dead weight of the drill rod, and the inclined grooves can further convert the axial movement into the clamping force of the slips to the drill rod.

Description

Technical Field

[0001] The utility model belongs to the field of drilling equipment, in particular to a power head slip assembly. Background Art

[0002] The slips in the power head are an important component of the power head. The slips clamp the drill rod so that the drill rod can rotate synchronously with the power head. The power head needs to clamp and loosen the drill rod frequently. Common power heads clamp the drill rod directly through the oil cylinder, which has a simple structure and is energy-consuming. Therefore, it is necessary to provide a power head slip assembly with a better structure. Utility Model Content

[0003] The utility model aims to provide a power head slip assembly to solve the technical problems that common power heads directly clamp drill rods through oil cylinders, have a single structure and consume energy.

[0004] To achieve the above purpose, the specific technical solution of the utility model is as follows:

[0005] A power head slip assembly is arranged in the power head, comprising slips, a tapered clamping ring and a power member, wherein the tapered clamping ring is sleeved on the main shaft of the power head, a side of the tapered clamping ring close to the main shaft is provided with an inclined groove, the slips are penetrated and arranged on the shaft wall of the main shaft, the slips are limited in the axial direction of the main shaft, the slips have a clamping surface for clamping a drill pipe and an inclined surface slidably connected with the inclined groove, and the power member provides force for the axial sliding of the tapered clamping ring along the main shaft. Through such a design, the power member drives the tapered clamping ring to move axially along the main shaft, and the inclined surface of the slips slides with the inclined groove. Since the slips are limited in the axial direction of the main shaft, the inclined surface will convert the sliding with the inclined groove into the movement of the slips in the radial direction of the main shaft. When the slips clamp the drill pipe, the slips will slightly move axially along the main shaft due to the deadweight of the drill pipe, and the inclined groove will further convert this axial movement into the clamping force of the slips on the drill pipe.

[0006] Furthermore, the power part includes a disc spring and a driving oil cylinder. The disc spring is sleeved on the outer wall of the main shaft. One end of the disc spring abuts against a retaining ring fixed on the outer wall of the main shaft, and the other end abuts against a tapered retaining ring. The disc spring pushes the tapered retaining ring along the axial direction of the main shaft; the driving oil cylinder pushes the tapered retaining ring in the opposite direction of the disc spring along the axial direction of the main shaft. With such a design, the drill rod is clamped by the preload force of the disc spring itself, saving energy.

[0007] Furthermore, the driving oil cylinder includes a piston sleeve and an outer sleeve, the piston sleeve is fixedly connected to the tapered retaining ring, and the piston sleeve is configured to slide along the main shaft axially; the piston sleeve is sleeved on the outer periphery of the tapered retaining ring, and the outer sleeve is sleeved on the outer periphery of the piston sleeve, and the fitting surfaces of the outer sleeve and the piston sleeve are provided with a relative step structure, and the step structure cooperates to form a hydraulic chamber. Through such a design, the disc spring serves as a power source for the slips to clamp the drill rod, and the oil cylinder serves as a power source for the slips to loosen the drill rod, so the oil cylinder is only used at the moment of loosening the drill rod, which greatly reduces the use time of the oil cylinder and saves energy.

[0008] Furthermore, a spring pressure seat is fixedly provided at the top of the piston sleeve, and the spring pressure seat has a plurality of spring installation bolts arranged along the main shaft axis, and the end of the spring installation bolt is inserted into the top of the outer shell, and the spring pressure seat is configured to change the depth of the spring installation bolt inserted into the top of the outer shell as the piston sleeve moves, and the spring installation bolt sleeve is provided with a load-reducing spring, and the load-reducing spring is elastically supported between the spring pressure seat and the outer shell, and a bearing tray is fixedly provided at one end of the tapered retaining ring close to the disc spring, and the bearing tray supports a tapered bearing, and the tapered bearing includes a tapered outer ring and a tapered inner ring, and the tapered outer ring is fixed to the piston sleeve, and the tapered inner ring is fixed to the bearing tray. Through such a design, when the driving cylinder does not press down the piston sleeve, the load-reducing spring pushes up the spring pressure seat, and the spring pressure seat drives the piston sleeve upward, and the piston sleeve lifts the tapered outer ring, thereby reducing the pressure between the tapered outer ring and the tapered inner ring, protecting the tapered bearing, and extending the service life of the tapered bearing.

[0009] Furthermore, the tapered clamping ring is provided with a plurality of inclined grooves, the groove bottom of the inclined groove is provided with a widening opening, a slip slide plate is slidably arranged in the widening opening, and the slip slide plate is fixed to the inclined surface of the slip. With such a design, the slip slide plate is inserted into the widening opening to prevent the slip from falling out of the inclined groove when in use.

[0010] Furthermore, the clamping surface of the slip is provided with an alloy slip installation groove, in which the alloy slip is fixedly arranged, and the clamping surface of the alloy slip is provided with a sharp tooth structure. With such a design, when the slip clamps the drill pipe, the sharp tooth structure can push into the outer wall of the drill pipe, thereby increasing the clamping force of the slip on the drill pipe.

[0011] Furthermore, the alloy slip installation groove is gradually narrowed in the direction away from the slip, the alloy slip is a trapezoidal block, the wide bottom surface of the alloy slip is welded to the alloy slip installation groove, the narrow bottom surface of the alloy slip is a clamping surface, and the alloy slip installation groove is provided with anti-slip screws at both ends of the alloy slip. When the alloy slip is used for too long and the welding structure is loose, the trapezoidal block structure of the alloy slip can prevent it from falling out of the notch of the alloy slip installation groove, and the two ends of the alloy slip installation groove are provided with anti-slip screws to prevent the alloy slip from falling out of the two ends of the alloy slip installation groove, and avoid the alloy slip from falling to the bottom of the drill hole due to loosening. The alloy slip is hard and wear-resistant, which will greatly affect the drilling efficiency. At the same time, the alloy slip may also be stuck between the drill rod and the hole wall, causing the drill to be stuck. Forcibly lifting the drill will cause serious damage to the surface of the drill rod.

[0012] The beneficial effects of the utility model are as follows: the power part drives the tapered clamping ring to move axially along the main shaft, and the inclined surface of the slip slides with the inclined groove. Since the slip is limited in the axial direction of the main shaft, the inclined surface will convert the sliding with the inclined groove into the movement of the slip in the radial direction of the main shaft. When the slip clamps the drill pipe, the slip will move slightly axially along the main shaft due to the deadweight of the drill pipe, and the inclined groove will further convert this axial movement into the clamping force of the slip on the drill pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the planing structure of the power head;

[0014] Figure 2 for Figure 1 A schematic diagram of the enlarged structure of part A;

[0015] Figure 3 This is a schematic diagram of the power head structure of the utility model;

[0016] Figure 4 It is a schematic diagram of the assembly structure of the disc spring, spring pressure seat, load-reducing spring and other components of the utility model;

[0017] Figure 5 This is a schematic diagram of the assembly structure of the piston sleeve and other components of the utility model;

[0018] Figure 6 This is a schematic diagram of the assembly structure of the gasket, piston sleeve and other components of the utility model;

[0019] Figure 7 This is a schematic diagram of the main shaft and slip assembly structure of the utility model;

[0020] Figure 8 This is a schematic diagram of the assembly structure of six groups of slips and the main shaft of the utility model;

[0021] Fig. 9 It is a schematic diagram of the assembly structure of the taper chuck and slips of the utility model;

[0022] Fig.10 This is a schematic diagram of the structure of the slip clamping surface of the utility model;

[0023] Fig.11 This is a schematic diagram of the inclined surface structure of the slip of the utility model;

[0024] Fig.12 This is a schematic diagram of the alloy slip structure of the utility model;

[0025] Explanation of marks in the figure: 1. Slip; 2. Taper retaining ring; 3. Main shaft; 4. Inclined groove; 5. Clamping surface; 6. Inclined surface; 7. Disc spring; 8. Driving cylinder; 9. Retaining ring; 10. Piston sleeve; 11. Outer shell; 12. Step structure; 13. Hydraulic chamber; 14. Spring pressure seat; 15. Spring mounting bolt; 16. Load-reducing spring; 17. Bearing tray; 18. Conical bearing; 19. Conical outer ring; 20. Conical inner ring; 21. Widening mouth; 22. Slip slide plate; 23. Alloy slip installation groove; 24. Alloy slip; 25. Sharp tooth structure; 26. Anti-slip screw. DETAILED DESCRIPTION

[0026] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0027] like Figures 1 to 12 shown.

[0028] Example 1

[0029] A power head slip assembly is arranged in the power head, comprising a slip 1, a tapered retaining ring 2 and a power piece, wherein the tapered retaining ring 2 is sleeved on the main shaft 3 of the power head, and a bevel groove 4 is arranged on the side of the tapered retaining ring 2 close to the main shaft 3, the slip 1 penetrates the shaft wall of the main shaft 3, the slip 1 is limited in the axial direction of the main shaft 3, the slip 1 has a clamping surface 5 for clamping a drill pipe and an inclined surface 6 slidably connected to the bevel groove 4, and the power piece provides force for the tapered retaining ring 2 to slide axially along the main shaft 3.

[0030] The power part includes a disc spring 7 and a driving cylinder 8. The disc spring 7 is sleeved on the outer wall of the main shaft 3. One end of the disc spring 7 abuts against a retaining ring 9 fixed on the outer wall of the main shaft 3, and the other end abuts against a tapered retaining ring 2. The disc spring 7 pushes the tapered retaining ring 2 axially along the main shaft 3; the driving cylinder 8 pushes the tapered retaining ring 2 in the opposite direction of the disc spring 7 along the axial direction of the main shaft 3. The driving cylinder 8 includes a piston sleeve 10 and an outer sleeve 11. The piston sleeve 10 is fixedly connected to the tapered retaining ring 2, and the piston sleeve 10 is configured to slide axially along the main shaft 3; the piston sleeve 10 is sleeved on the outer periphery of the tapered retaining ring 2, and the outer sleeve 11 is sleeved on the outer periphery of the piston sleeve 10. The fitting surfaces of the outer sleeve 11 and the piston sleeve 10 are provided with a relative step structure 12, and the step structure 12 cooperates to form a hydraulic chamber 13.

[0031] The implementation of the above embodiment is as follows:

[0032] When the tapered retaining ring 2 moves up and down, the slip 1 will also tend to move. Since the slip 1 is limited in the axial direction of the main shaft 3, the slip 1 can only slide relative to the inclined groove 4. When the tapered retaining ring 2 moves up and down, the thickness of the matching position of the inclined groove 4 and the slip 1 will change, thereby pushing the slip 1 to move along the radial direction of the main shaft 3. The slip 1 clamps the drill rod through the elastic preload force of the disc spring 7. When the drill rod needs to be replaced, the oil cylinder 8 is driven to inject oil into the hydraulic chamber 13 to push the piston sleeve 10 downward. The piston sleeve 10 drives the tapered retaining ring 2 to move downward. As the tapered retaining ring 2 moves downward, the slip 1 gradually moves away from the central axis of the main shaft 3 to release the drill rod, saving energy.

[0033] Example 2

[0034] A spring pressure seat 14 is fixedly provided on the top of the piston sleeve 10, and the spring pressure seat 14 has a plurality of spring mounting bolts 15 axially arranged along the main shaft 3, and the end of the spring mounting bolt 15 is inserted into the top of the outer shell sleeve 11, and the spring pressure seat 14 is configured to change the depth of the spring mounting bolt 15 inserted into the top of the outer shell sleeve 11 as the piston sleeve 10 moves, and the spring mounting bolt 15 is sleeved with a load-reducing spring 16, and the load-reducing spring 16 is elastically supported between the spring pressure seat 14 and the outer shell sleeve 11, and a bearing tray 17 is fixedly provided at one end of the tapered retaining ring 2 close to the disc spring 7, and the bearing tray 17 supports a tapered bearing 18, and the tapered bearing 18 includes a tapered outer ring 19 and a tapered inner ring 20, and the tapered outer ring 19 is fixed to the piston sleeve 10, and the tapered inner ring 20 is fixed to the bearing tray 17.

[0035] The implementation method of the above embodiment is: when the driving cylinder 8 does not press down the piston sleeve 10, the load-reducing spring 16 pushes up the spring pressure seat 14, the spring pressure seat 14 drives the piston sleeve 10 upward, and the piston sleeve 10 lifts the tapered outer ring, thereby reducing the pressure between the tapered outer ring and the tapered inner ring, protecting the tapered bearing 18, and extending the service life of the tapered bearing 18.

[0036] Example 3

[0037] The tapered retaining ring 2 is provided with a plurality of inclined grooves 4 , and a widened opening 21 is provided at the bottom of the inclined groove 4 , a slip slide plate 22 is slidably arranged in the widened opening 21 , and the slip slide plate 22 is fixed to the inclined surface 6 of the slip 1 .

[0038] The clamping surface 5 of the slip 1 is provided with an alloy slip installation groove 23 , an alloy slip 24 is fixedly arranged in the alloy slip installation groove 23 , and the clamping surface 5 of the alloy slip 24 is provided with a sharp tooth structure 25 .

[0039] The alloy slip installation groove 23 gradually narrows in the direction away from the slip 1, the alloy slip 24 is a trapezoidal block, the wide bottom surface of the alloy slip 24 is welded to the alloy slip installation groove 23, the narrow bottom surface of the alloy slip 24 is the clamping surface 5, and the alloy slip installation groove 23 is provided with anti-slip screws 26 at both ends of the alloy slip 24.

[0040] The implementation of the above embodiment is as follows:

[0041] When the slip 1 is clamping the drill pipe, the sharp tooth structure 25 can push into the outer wall of the drill pipe, increasing the clamping force of the slip 1 on the drill pipe. When the trapezoidal structure of the alloy slip 24 is inserted into the alloy slip installation groove 23, the trapezoidal block structure of the alloy slip 24 can prevent it from detaching from the notch of the alloy slip installation groove 23, and the two ends of the alloy slip installation groove 23 are provided with anti-slip screws 26. When the alloy slip 24 is not firmly welded after long-term use, the alloy slip 24 is prevented from falling to the bottom of the drill hole due to loosening. The alloy slip 24 is hard and wear-resistant, which will greatly affect the drilling efficiency. At the same time, the alloy slip 24 may also be stuck between the drill pipe and the hole wall, causing the drill to be stuck. Forcibly lifting the drill will cause serious damage to the surface of the drill pipe.

[0042] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A power head slip assembly, arranged in a power head, characterized in that: The invention comprises a slip (1), a tapered retaining ring (2) and a power piece, wherein the tapered retaining ring (2) is sleeved on a main shaft (3) of a power head, a side of the tapered retaining ring (2) close to the main shaft (3) is provided with an inclined groove (4), the slip (1) is penetrated through the shaft wall of the main shaft (3), the slip (1) is limited in the axial direction of the main shaft (3), the slip (1) has a clamping surface (5) for clamping a drill pipe and an inclined surface (6) slidably connected to the inclined groove (4), and the power piece provides force for the tapered retaining ring (2) to slide along the axial direction of the main shaft (3).

2. The power head slip assembly according to claim 1, characterized in that: The power component comprises a disc spring (7) and a driving cylinder (8); the disc spring (7) is sleeved on the outer wall of the main shaft (3); one end of the disc spring (7) abuts against a retaining ring (9) fixed to the outer wall of the main shaft (3), and the other end abuts against a tapered retaining ring (2); the disc spring (7) pushes the tapered retaining ring (2) along the axial direction of the main shaft (3); and the driving cylinder (8) pushes the tapered retaining ring (2) in the opposite direction to the disc spring (7) along the axial direction of the main shaft (3).

3. The power head slip assembly according to claim 2, characterized in that: The driving cylinder (8) comprises a piston sleeve (10) and an outer sleeve (11); the piston sleeve (10) is fixedly connected to the tapered retaining ring (2); and the piston sleeve (10) is configured to slide axially along the main shaft (3); the piston sleeve (10) is sleeved on the outer circumference of the tapered retaining ring (2); the outer sleeve (11) is sleeved on the outer circumference of the piston sleeve (10); the mating surfaces of the outer sleeve (11) and the piston sleeve (10) are provided with relative step structures (12); and the step structures (12) cooperate to form a hydraulic chamber (13).

4. The power head slip assembly according to claim 3, characterized in that: A spring pressure seat (14) is fixedly arranged on the top of the piston sleeve (10), and the spring pressure seat (14) has a plurality of spring mounting bolts (15) arranged axially along the main shaft (3). The ends of the spring mounting bolts (15) are inserted into the top of the outer shell (11). The spring pressure seat (14) is configured to change the depth of the spring mounting bolts (15) inserted into the top of the outer shell (11) as the piston sleeve (10) moves. The spring mounting bolts (15) are sleeved with a load-reducing spring (16). A load-reducing spring (16) is elastically supported between the spring pressure seat (14) and the outer shell (11); a bearing tray (17) is fixedly arranged at one end of the tapered retaining ring (2) close to the disc spring (7); the bearing tray (17) supports a conical bearing (18); the conical bearing (18) includes a conical outer ring (19) and a conical inner ring (20); the conical outer ring (19) is fixed to the piston sleeve (10), and the conical inner ring (20) is fixed to the bearing tray (17).

5. The power head slip assembly according to claim 1, characterized in that: The tapered clamping ring (2) is provided with a plurality of inclined grooves (4), the groove bottom of the inclined groove (4) is provided with a widening opening (21), a slip guide plate (22) is slidably arranged in the widening opening (21), and the slip guide plate (22) is fixed to the inclined surface (6) of the slip (1).

6. The power head slip assembly according to claim 5, characterized in that: The clamping surface (5) of the slip (1) is provided with an alloy slip installation groove (23), an alloy slip (24) is fixedly arranged in the alloy slip installation groove (23), and the clamping surface (5) of the alloy slip (24) is provided with a sharp tooth structure (25).

7. The power head slip assembly according to claim 6, characterized in that: The alloy slip installation groove (23) gradually narrows in a direction away from the slip (1); the alloy slip (24) is a trapezoidal block; the wide bottom surface of the alloy slip (24) is welded to the alloy slip installation groove (23); the narrow bottom surface of the alloy slip (24) is a clamping surface (5); and the alloy slip installation groove (23) is provided with anti-slip screws (26) at both ends of the alloy slip (24).

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