Buffering device for power head of drilling machine

Abstract

The utility model discloses a drilling machine power head buffer device, which relates to the technical field of drilling equipment, and comprises an outer hub, a tensioning sleeve, a connecting component, a floating joint, a threaded fastener and a main shaft, the tensioning sleeve is sleeved on the outer wall of the main shaft, the outer hub is sleeved on the outer wall of the tensioning sleeve, and the connecting component is arranged on the outer hub. The outer hub is detachably connected with the connecting assembly through a threaded fastener, the floating connector is in sliding fit with the main shaft, and the outer wall of the floating connector is sleeved with the connecting assembly. According to the technical scheme, rapid positioning and fixing between the outer hub and the main shaft are achieved through the tensioning sleeve, the installation steps and time are reduced, and the structural stability and reliability of the whole drilling machine power head buffering device are enhanced; the detachable connection between the outer hub and the connecting assembly is achieved through the threaded fastener, the structure is simple, the drilling machine power head buffering device is more convenient to assemble and maintain, the overall working efficiency can be improved, and the downtime can be shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling equipment, and particularly relates to a buffer device for a drilling rig power head. Background Art

[0002] Top drive power heads are widely used in the drilling and development of oil wells, water wells, coalbed methane wells, mine ventilation holes, geothermal wells, and emergency rescue wells. The function of the buffer device for the top drive power head is to provide an up and down floating distance for the make-up and break-out of drill pipes, so as to avoid damaging the drill pipe threads. However, the existing buffer devices for top drive power heads have complex structures, are difficult to disassemble, and are inconvenient for replacement and maintenance.

[0003] Therefore, how to make the disassembly and assembly of the buffer device for the top drive power head and the main shaft simpler is an urgent problem to be solved at present. Summary of the Utility Model

[0004] The main object of the utility model is to propose a buffer device for a drilling rig power head, aiming to solve the problem of how to make the disassembly and assembly of the buffer device for the top drive power head and the main shaft simpler.

[0005] To achieve the above object, the utility model proposes a buffer device for a drilling rig power head, which includes an outer hub, a tension sleeve, a connection assembly, a floating joint, a threaded fastener, and a main shaft. The tension sleeve is sleeved on the outer wall of the main shaft, the outer hub is sleeved on the outer wall of the tension sleeve, the tension sleeve can limit the relative movement of the outer hub with respect to the main shaft, the outer hub is detachably connected to the connection assembly through the threaded fastener, the floating joint is slidably matched with the main shaft, the connection assembly is sleeved on the outer wall of the floating joint, a first boss protrudes outward from the outer wall of the floating joint, a second boss protrudes inward from the inner wall of the connection assembly, and the first boss can abut against the second boss to limit the sliding of the floating joint along the axial direction of the main shaft away from the outer hub. One end of the floating joint away from the main shaft is used for connecting with a drill pipe.

[0006] In an embodiment, a first mounting hole is provided on the outer hub, a second mounting hole corresponding to the first mounting hole is provided on the connection assembly, and the threaded fastener is used to pass through the first mounting hole and then be threadedly connected to the second mounting hole;

[0007] The number of the first mounting holes is multiple, the multiple first mounting holes are arranged at intervals along the circumferential direction of the outer hub, the number of the second mounting holes is the same as that of the first mounting holes and is arranged in one-to-one correspondence, and the number of the threaded fasteners is the same as that of the first mounting holes and is arranged in one-to-one correspondence.

[0008] In one embodiment, a smooth shaft section and an external spline section are sequentially arranged on the outer wall of the main shaft along the axial direction of the main shaft. The expansion sleeve is sleeved on the outer wall of the smooth shaft section. One end of the floating joint close to the outer hub is provided with an internal spline section, and the internal spline section is in sliding fit with the external spline section.

[0009] In one embodiment, a threaded section is further arranged between the smooth shaft section and the external spline section. Two ends of the threaded section are respectively connected to the smooth shaft section and the external spline section. The drill rig power head buffer device further includes a screw sleeve. The screw sleeve is sleeved on the main shaft and is in spiral fit with the threaded section, and two sides of the screw sleeve can respectively abut against the outer hub and the connection assembly.

[0010] In one embodiment, a first positioning arc-shaped groove and a second positioning arc-shaped groove are respectively arranged on two sides of the screw sleeve. The outer hub can abut against the inner wall of the first positioning arc-shaped groove so that the axis of the outer hub is parallel to the axis of the main shaft, and the connection assembly can abut against the inner wall of the second positioning arc-shaped groove so that the axis of the connection assembly is parallel to the axis of the main shaft.

[0011] In one embodiment, the connection assembly includes a connection seat and a shaft sleeve. The outer hub is detachably connected to the connection seat through the threaded fastener. A second boss protrudes from the inner wall of the connection seat. Both the connection seat and the shaft sleeve are sleeved on the outer wall of the floating joint. Two ends of the shaft sleeve respectively abut against the screw sleeve and the second boss. The outer wall of the shaft sleeve abuts against the inner wall of the connection seat, and the inner wall of the shaft sleeve is in sliding fit with the outer wall of the floating joint.

[0012] In one embodiment, a first lubricating hole is formed in the connection seat so that lubricant can lubricate the shaft sleeve through the first lubricating hole.

[0013] In one embodiment, the drill rig power head buffer device further includes an inner sleeve. One end of the inner sleeve is detachably connected to the main shaft, and the other end of the inner sleeve is inserted into the floating joint and is in sliding fit with the floating joint.

[0014] In one embodiment, the drill rig power head buffer device further includes a first seal. A first annular groove for accommodating the first seal is arranged on the inner sleeve, and the first seal is used for abutting against the inner wall of the main shaft;

[0015] and / or,

[0016] The drill rig power head buffer device further includes a second seal. A second annular groove for accommodating the second seal is arranged on the floating joint, and the second seal is used for abutting against the outer wall of the inner sleeve.

[0017] In one embodiment, the buffer device of the drill rig power head further includes a third seal. A third annular groove for accommodating the third seal is provided at one end of the connection assembly away from the outer hub, and the third seal is used to abut against the outer wall of the floating joint.

[0018] In the embodiment of the present utility model, the buffer device of the drill rig power head is used to connect the main shaft and the drill pipe, and absorb the impact and vibration suffered by the drill pipe during the drilling process, thereby reducing the damage to the main shaft and the drill pipe; specifically, by setting a tension sleeve, rapid positioning and fixing between the outer hub and the main shaft can be achieved, reducing the installation steps and time. The tension sleeve can limit the movement of the outer hub relative to the main shaft, enhancing the structural stability and reliability of the entire buffer device of the drill rig power head; the detachable threaded connection design between the outer hub and the connection component makes the assembly and maintenance of the buffer device of the drill rig power head more convenient, can improve the overall working efficiency, reduce the downtime, and local maintenance or component replacement can be carried out without disassembling the entire buffer device of the drill rig power head during disassembly, which can effectively reduce the maintenance cost; one end of the floating joint is slidably matched with the main shaft, and the other end of the floating joint is detachably connected to the drill pipe, which can absorb vibration and impact to a certain extent, protect the main shaft, the drill pipe and other components from damage, thereby prolonging the service life of the buffer device of the drill rig power head; through the abutment of the first boss and the second boss, the tensile load of the drill pipe can be transmitted, and the axial movement of the floating joint along the main shaft can also be precisely controlled to ensure that the floating joint floats within the set stroke range, thereby providing stable operating performance. When installing the buffer device of the drill rig power head, first sleeve the tension sleeve and the outer hub on the outer wall of the main shaft, achieve rapid positioning and fixing between the outer hub and the main shaft through the tension sleeve, then sleeve the connection component on the outer wall of the floating joint, make the first boss and the second boss abut, and then sleeve the installed connection component and the floating joint from the lower part of the main shaft, make the floating joint and the main shaft slidably matched, and finally use threaded fasteners to connect the outer hub and the connection component, thereby realizing the installation and fixation of the buffer device of the drill rig power head. When disassembling, only need to remove the threaded fasteners to separate the outer hub and the connection component. Compared with the existing connection method between the top drive power head buffer device and the main shaft through large taper threads, the structure is simpler, the operation is more flexible, and the maintenance is more convenient. The technical solution of the present utility model realizes rapid positioning and fixing between the outer hub and the main shaft by adopting a tension sleeve, reduces the installation steps and time, and enhances the structural stability and reliability of the entire buffer device of the drill rig power head; realizes the detachable connection between the outer hub and the connection component by adopting threaded fasteners, with a simple structure, making the assembly and maintenance of the buffer device of the drill rig power head more convenient, can improve the overall working efficiency, reduce the downtime, and local maintenance or component replacement can be carried out without disassembling the entire buffer device of the drill rig power head during disassembly, which can effectively reduce the maintenance cost; by adopting a floating joint, vibration and impact can be absorbed to a certain extent, protecting the main shaft, the drill pipe and other components from damage, thereby prolonging the service life of the buffer device of the drill rig power head. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0020] Figure 1 Schematic structural diagram of an embodiment of the buffer device for the drill rig power head of the present invention;

[0021] Figure 2 Schematic cross-sectional view of an embodiment of the buffer device for the drill rig power head of the present invention;

[0022] Figure 3 Schematic structural diagram of an embodiment of the connecting seat of the buffer device for the drill rig power head of the present invention;

[0023] Figure 4 Schematic structural diagram of an embodiment of the floating joint of the buffer device for the drill rig power head of the present invention;

[0024] Figure 5 Schematic structural diagram of an embodiment of the main shaft of the buffer device for the drill rig power head of the present invention;

[0025] Figure 6 Schematic structural diagram of an embodiment of the screw sleeve of the buffer device for the drill rig power head of the present invention;

[0026] Figure 7 For Figure 2 Partial enlarged view at position A in

[0027] Explanation of the reference numerals in the drawings:

[0028] 100. Buffer device for drill rig power head; 1. Outer hub; 11. First mounting hole; 2. Expansion sleeve; 3. Connecting assembly; 31. Connecting seat; 311. Second boss; 312. Second mounting hole; 313. First lubricating hole; 314. Third annular groove; 32. Sleeve; 4. Floating joint; 41. First boss; 42. Internal spline section; 43. Second annular groove; 44. Second lubricating hole; 5. Threaded fastener; 6. Main shaft; 61. Smooth shaft section; 62. External spline section; 63. Threaded section; 7. Screw sleeve; 71. First positioning arc-shaped groove; 72. Second positioning arc-shaped groove; 73. Internal threaded hole; 8. Inner sleeve; 81. First annular groove; 9. First seal; 110. Second seal; 120. Third seal.

[0029] The realization of the object, functional features and advantages of the present invention will be further described in conjunction with the embodiments with reference to the drawings. Detailed implementation manners

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0031] It should be noted that if there are directional indications (such as up, down, left, right, front, and back) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0032] In addition, if there are descriptions such as "first" and "second" involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0033] The top drive power head is widely used in the drilling and development of oil wells, water wells, coalbed methane wells, mine ventilation holes, geothermal wells, and emergency rescue wells. The design purpose of the top drive power head buffer device is to provide the necessary up and down floating distance when the drill pipe is made up and broken out to protect the drill pipe thread from damage. The existing top drive power head buffer devices may have problems such as complex structure, difficult disassembly, and inconvenient maintenance.

[0034] The applicant has carefully studied and found that to ensure the connection strength between the top drive power head buffer device and the main shaft, the top drive power head buffer device is usually connected to the main shaft through a large taper thread. However, the structure of the taper thread connection is complex, and it may be difficult and time-consuming to repair or replace once needed.

[0035] The present utility model proposes a buffer device for the power head of a drilling rig to solve the problem of how to make the disassembly and assembly of the top drive power head buffer device and the main shaft simpler.

[0036] Please refer to Figures 1 to 4, in an embodiment of the present utility model, the drilling rig power head buffer device 100 includes an outer hub 1, a tension sleeve 2, a connection assembly 3, a floating joint 4, a threaded fastener 5, and a main shaft 6. The tension sleeve 2 is sleeved on the outer wall of the main shaft 6, the outer hub 1 is sleeved on the outer wall of the tension sleeve 2, and the tension sleeve 2 can limit the relative movement of the outer hub 1 with respect to the main shaft 6. The outer hub 1 is detachably connected to the connection assembly 3 through the threaded fastener 5. The floating joint 4 is slidably matched with the main shaft 6, the connection assembly 3 is sleeved on the outer wall of the floating joint 4, a first boss 41 protrudes outward from the outer wall of the floating joint 4, and a second boss 311 protrudes inward from the inner wall of the connection assembly 3. The first boss 41 can abut against the second boss 311 to limit the sliding of the floating joint 4 along the axial direction of the main shaft 6 away from the outer hub 1. One end of the floating joint 4 away from the main shaft 6 is used for connecting with a drill pipe.

[0037] In the embodiment of the present utility model, the drilling rig power head buffer device 100 is used to connect the main shaft 6 and the drill pipe, and absorb the impact and vibration received by the drill pipe during the drilling process, thereby reducing the damage to the main shaft 6 and the drill pipe; specifically, by setting the expansion sleeve 2, rapid positioning and fixation between the outer hub 1 and the main shaft 6 can be achieved, reducing the installation steps and time. The expansion sleeve 2 can limit the movement of the outer hub 1 relative to the main shaft 6, enhancing the structural stability and reliability of the entire drilling rig power head buffer device 100; the detachable threaded connection design between the outer hub 1 and the connection assembly 3 makes the assembly and maintenance of the drilling rig power head buffer device 100 more convenient, can improve the overall working efficiency, reduce the downtime, and can perform partial maintenance or component replacement without disassembling the entire drilling rig power head buffer device 100, effectively reducing the maintenance cost; one end of the floating joint 4 is slidably matched with the main shaft 6, and the other end of the floating joint 4 is detachably connected to the drill pipe, which can absorb vibration and impact to a certain extent, protect the main shaft 6, the drill pipe and other components from damage, thereby extending the service life of the drilling rig power head buffer device 100; through the abutment of the first boss 41 and the second boss 311, the tensile load of the drill pipe can be transmitted, and the axial movement of the floating joint 4 along the main shaft 6 can be accurately controlled to ensure that the floating joint 4 floats within the set stroke range, thereby providing stable operating performance. When installing the drilling rig power head buffer device 100, first sleeved the expansion sleeve 2 and the outer hub 1 on the outer wall of the main shaft 6, and achieve rapid positioning and fixation between the outer hub 1 and the main shaft 6 through the expansion sleeve 2. Then sleeved the connection assembly 3 on the outer wall of the floating joint 4, so that the first boss 41 and the second boss 311 are abutted. Then insert the installed connection assembly 3 and the floating joint 4 from the lower part of the main shaft 6, so that the floating joint 4 and the main shaft 6 are slidably matched. Finally, use the threaded fastener 5 to connect the outer hub 1 and the connection assembly 3, thereby realizing the installation and fixation of the drilling rig power head buffer device 100. When disassembling, only need to remove the threaded fastener 5 to separate the outer hub 1 from the connection assembly 3. Compared with the existing top drive power head buffer device connected to the main shaft 6 by a large taper thread connection method, the structure is simpler, the operation is more flexible, and the maintenance is more convenient.

[0038] The technical solution of the present utility model realizes the rapid positioning and fixation between the outer hub 1 and the main shaft 6 by adopting a tension sleeve 2, reducing the installation steps and time, and enhancing the structural stability and reliability of the entire drill rig power head buffer device 100; by adopting a threaded fastener 5, the detachable connection between the outer hub 1 and the connection assembly 3 is realized, with a simple structure, making the assembly and maintenance of the drill rig power head buffer device 100 more convenient, capable of improving the overall working efficiency, reducing the downtime, and enabling local maintenance or component replacement without disassembling the entire drill rig power head buffer device 100 during disassembly, which can effectively reduce the maintenance cost; by adopting a floating joint 4, vibration and impact can be absorbed to a certain extent, protecting the main shaft 6, drill pipe and other components from damage, thereby extending the service life of the drill rig power head buffer device 100.

[0039] In this embodiment, one end of the floating joint 4 away from the main shaft 6 is threadedly connected to the drill pipe, thereby realizing the detachable connection between the floating joint 4 and the drill pipe, with a simple structure and convenient disassembly and assembly.

[0040] In one embodiment, a first mounting hole 11 is provided on the outer hub 1, and a second mounting hole 312 corresponding to the first mounting hole 11 is provided on the connecting assembly 3. The threaded fastener 5 is used to pass through the first mounting hole 11 and then threadedly connect with the second mounting hole 312. The number of the first mounting holes 11 is multiple, and the multiple first mounting holes 11 are arranged at intervals along the circumferential direction of the outer hub 1. The number of the second mounting holes 312 is the same as that of the first mounting holes 11 and is arranged in one-to-one correspondence. The number of the threaded fasteners 5 is the same as that of the first mounting holes 11 and is arranged in one-to-one correspondence. Specifically, by providing multiple first mounting holes 11 and corresponding second mounting holes 312, as well as the matching threaded fasteners 5, the contact area and friction force between the connecting assembly 3 and the outer hub 1 can be increased, thereby improving the strength and rigidity of the drill rig power head buffer device 100. Multiple mounting positions and methods can be provided, which can be suitable for different mounting requirements and conditions, and can allow adaptation to different sizes of the outer hub 1 and the connecting assembly 3, improving the versatility and adaptability of the drill rig power head buffer device 100. In addition, in this embodiment, the multiple first mounting holes 11 are evenly arranged along the circumferential direction of the outer hub 1, which helps to evenly distribute the fastening force between the connecting assembly 3 and the outer hub 1, reduce local stress concentration, and improve the stability and reliability of the connection of the drill rig power head buffer device 100. Moreover, the first mounting holes 11, the second mounting holes 312 and the threaded fasteners 5 arranged in one-to-one correspondence also help to ensure the coaxiality between the connecting assembly 3 and the outer hub 1, which is crucial for ensuring the precise operation of the drill rig power head buffer device 100. The design of multiple threaded fasteners 5 can reduce the demand for customized parts, improve production efficiency and reduce costs, and also facilitate automatic assembly, improving the assembly speed and accuracy. When disassembling the drill rig power head buffer device 100, only need to remove the multiple threaded fasteners 5 to separate the outer hub 1 from the connecting assembly 3. Compared with the existing way that the top drive power head buffer device and the main shaft 6 are connected by a large taper thread, the structure is simpler, the operation is more flexible, and the maintenance is more convenient. In this embodiment, the threaded fastener 5 includes a bolt, and the second mounting hole 312 is a threaded hole. The bolt passes through the first mounting hole 11 and then threadedly connects with the second mounting hole 312, thereby realizing the detachable connection between the outer hub 1 and the connecting assembly 3.

[0041] According to an embodiment of the present invention, the threaded fastener 5 includes a bolt and a nut. The bolt passes through the first mounting hole 11 and the second mounting hole 312 and then threadedly connects with the nut, thereby realizing the detachable connection between the outer hub 1 and the connecting assembly 3.

[0042] Please refer to 2 and Figure 5, in an embodiment, a smooth shaft section 61 and an external spline section 62 are sequentially arranged on the outer wall of the main shaft 6 along the axial direction of the main shaft 6. The expansion sleeve 2 is sleeved on the outer wall of the smooth shaft section 61. One end of the floating joint 4 close to the outer hub 1 is provided with an internal spline section 42, and the internal spline section 42 is in sliding fit with the external spline section 62. Specifically, by providing the smooth shaft section 61, the expansion sleeve 2 can be easily sleeved on the main shaft 6, facilitating the installation and adjustment of the position of the expansion sleeve 2. By providing the sliding fit between the internal spline section 42 and the external spline section 62, the floating joint 4 has a certain movement space in the axial direction of the main shaft 6, which helps to absorb vibration and shock, protect the main shaft 6, drill pipe and other components from damage, thereby extending the service life of the drill rig power head buffer device 100. Moreover, the sliding fit between the internal spline section 42 and the external spline section 62 can also achieve the precise positioning and torque transmission of the floating joint 4, which can improve the stability, reliability and load-bearing capacity of the drill rig power head buffer device 100, ensure the effective operation of the drill rig power head buffer device 100, and make the disassembly and assembly of the floating joint 4 and the main shaft 6 more convenient through spline fit, which is beneficial to timely maintenance and inspection.

[0043] In an embodiment, a threaded section 63 is further arranged between the smooth shaft section 61 and the external spline section 62. The two ends of the threaded section 63 are respectively connected to the smooth shaft section 61 and the external spline section 62. The drill rig power head buffer device 100 further includes a screw sleeve 7. The screw sleeve 7 is sleeved on the main shaft 6 and is in screw fit with the threaded section 63, and both sides of the screw sleeve 7 can respectively abut against the outer hub 1 and the connecting component 3. Specifically, an internal threaded hole 73 is provided on the screw sleeve 7, and the internal threaded hole 73 is in screw fit with the threaded section 63. Through the pre-tightening force of the threaded fastener 5, the outer hub 1 and the connecting component 3 can respectively abut against both sides of the screw sleeve 7, thereby clamping the screw sleeve 7 and restricting the relative rotation of the screw sleeve 7 with respect to the main shaft 6. Whether the drill rig power head rotates forward or backward, it can prevent the drill rig power head buffer device 100 and the main shaft 6 from loosening, thereby improving the safety of the operation. Moreover, the screw sleeve 7 can bear the pressure from the outer hub 1 and can transmit the pulling force of the drill pipe.

[0044] Please refer to Figure 2 and Figure 6, in one embodiment, first positioning arc-shaped grooves 71 and second positioning arc-shaped grooves 72 are respectively arranged on both sides of the screw sleeve 7. The outer hub 1 can abut against the inner wall of the first positioning arc-shaped groove 71 to make the axis of the outer hub 1 parallel to the axis of the main shaft 6, and the connecting assembly 3 can abut against the inner wall of the second positioning arc-shaped groove 72 to make the axis of the connecting assembly 3 parallel to the axis of the main shaft 6. Specifically, by the outer hub 1 abutting against the inner wall of the first positioning arc-shaped groove 71 and the connecting assembly 3 abutting against the inner wall of the second positioning arc-shaped groove 72, it can be ensured that the axes of both the outer hub 1 and the connecting assembly 3 are parallel to the axis of the main shaft 6, thereby ensuring the coaxiality of the drilling rig power head buffer device 100, contributing to improving the assembly accuracy and operation stability of the drilling rig power head buffer device 100, reducing the wear between the main shaft 6, the outer hub 1 and the connecting assembly 3, and prolonging the service life of the components. Moreover, the assembly process is simple. By setting the first positioning arc-shaped groove 71 and the second positioning arc-shaped groove 72, the outer hub 1 and the connecting assembly 3 can be accurately positioned on the screw sleeve 7 without additional positioning devices or complex adjustments, reducing the time required for assembly and adjustment, and contributing to improving the installation efficiency and production efficiency. In this embodiment, the second positioning arc-shaped groove 72 can have the same structure as the first positioning arc-shaped groove 71.

[0045] Please refer to Figure 2 and Figure 3 , in one embodiment, the connecting assembly 3 includes a connecting seat 31 and a bushing 32. The outer hub 1 is detachably connected to the connecting seat 31 through a threaded fastener 5. A second boss 311 protrudes from the inner wall of the connecting seat 31. Both the connecting seat 31 and the bushing 32 are sleeved on the outer wall of the floating joint 4. Both ends of the bushing 32 abut against the screw sleeve 7 and the second boss 311 respectively. The outer wall of the bushing 32 abuts against the inner wall of the connecting seat 31, and the inner wall of the bushing 32 is in sliding fit with the outer wall of the floating joint 4. Specifically, by arranging the bushing 32, the gap between the floating joint 4 and the connecting seat 31 can be reduced, enabling the radial direction of the floating joint 4 to be reasonably positioned, thereby restricting the radial sway of the floating joint 4, ensuring the operation stability and reliability of the drilling rig power head buffer device 100, and also ensuring the sealing effect between the floating joint 4 and the connecting seat 31 to prevent leakage.

[0046] In one embodiment, a first lubricating hole 313 is formed in the connecting seat 31 to enable lubricant to lubricate the bushing 32 through the first lubricating hole 313. Specifically, by arranging the first lubricating hole 313, the maintenance process is simplified, enabling the lubricant to be directly delivered to the bushing 32 through the first lubricating hole 313, ensuring that the sliding fit surface between the bushing 32 and the outer wall of the floating joint 4 is fully lubricated, reducing the friction and wear between the bushing 32 and the floating joint 4, and prolonging the service life of the components.

[0047] In one embodiment, the drill rig power head buffer device 100 further includes an inner sleeve 8. One end of the inner sleeve 8 is detachably connected to the main shaft 6, and the other end of the inner sleeve 8 is inserted into the floating joint 4 and is in sliding fit with the floating joint 4. Specifically, the inner sleeve 8 is detachably connected to the main shaft 6 by bolts, making the installation and adjustment process of the inner sleeve 8 more convenient, enabling quick assembly and maintenance. The inner sleeve 8 can reduce the direct contact between the main shaft 6 and the floating joint 4, thereby reducing wear and extending the service life of the main shaft 6 and the floating joint 4. When the inner sleeve 8 is worn, it can be replaced in time. The connection between the inner sleeve 8 and the main shaft 6 can provide additional connection strength for the floating joint 4, ensuring the reliability of the floating joint 4 under high load conditions, helping to maintain the coaxiality between the floating joint 4 and the main shaft 6, thereby improving the movement accuracy of the drill rig power head buffer device 100, and the inner sleeve 8 also helps to improve the sealing performance of the floating joint 4 and prevent the leakage of the force medium.

[0048] According to an embodiment of the present invention, an external thread is provided at one end of the inner sleeve 8 close to the main shaft 6, and an internal thread is provided on the main shaft 6. The detachable connection between the inner sleeve 8 and the main shaft 6 is achieved through the spiral fit of the internal thread and the external thread.

[0049] Please refer to Figure 2 、 Figure 4 and Figure 7, in one embodiment, the drill rig power head buffer device 100 further includes a first seal 9. A first annular groove 81 for accommodating the first seal 9 is provided on the inner sleeve 8, and the first seal 9 is used to abut against the inner wall of the main shaft 6; and / or, the drill rig power head buffer device 100 further includes a second seal 110. A second annular groove 43 for accommodating the second seal 110 is provided on the floating joint 4, and the second seal 110 is used to abut against the outer wall of the inner sleeve 8; specifically, by providing the first seal 9 to abut against the inner wall of the main shaft 6 and the second seal 110 to abut against the outer wall of the inner sleeve 8, the sealing performance of the drill rig power head buffer device 100 is enhanced, effectively preventing the leakage of the pressure medium, ensuring the safety and environmental protection of the drilling operation; and the provision of the first seal 9 and the second seal 110 reduces the direct contact between the main shaft 6, the inner sleeve 8 and the floating joint 4, thereby reducing wear, extending the service life of the components, making maintenance and inspection work more convenient, helping to detect and solve problems in a timely manner, reducing maintenance costs and downtime, improving the reliability of the entire drill rig power head buffer device 100, and reducing the risk of failures caused by poor sealing. In addition, in this embodiment, the number of the first seals 9 is at least one, the number of the first annular grooves 81 is the same as and corresponds one-to-one to the number of the first seals 9, the number of the second seals 110 is at least one, and the number of the second annular grooves 43 is the same as and corresponds one-to-one to the number of the second seals 110, so as to improve the sealing effect of the drill rig power head buffer device 100. The specific numbers of the first seal 9 and the second seal 110 are not limited in this embodiment.

[0050] Please refer to Figure 2 and Figure 4 , in this embodiment, a second lubrication hole 44 is provided on the floating joint 4 so that the lubricant can lubricate the second seal 110 through the second lubrication hole 44; specifically, by providing the second lubrication hole 44, the maintenance process is simplified. The lubricant conveyed through the second lubrication hole 44 can prevent the second seal 110 from hardening due to overheating or drying, keep the second seal 110 flexible and elastic, thereby improving the sealing performance and preventing leakage, and the lubricant can also reduce the friction between the second seal 110 and the floating joint 4, thereby reducing the wear rate of the second seal 110, maintaining the integrity and functionality of the second seal 110, extending the service life of the second seal 110, reducing the replacement frequency, and reducing the maintenance cost.

[0051] In this embodiment, the lubricant can be a substance such as lubricating oil or grease for reducing friction, reducing wear, dissipating heat and sealing.

[0052] Please refer to Figure 2 and Figure 3, in one embodiment, the drill rig power head buffer device 100 further includes a third seal 120. A third annular groove 314 for accommodating the third seal 120 is provided at one end of the connecting assembly 3 away from the outer hub 1. The third seal 120 is used to abut against the outer wall of the floating joint 4. Specifically, by providing the third seal 120 to abut against the outer wall of the floating joint 4, a sealing guarantee is provided to prevent external impurities from entering the inside of the floating joint 4, ensuring the sealing integrity of the drill rig power head buffer device 100. Moreover, the third seal 120 is located in the third annular groove 314, which is convenient for disassembly and installation, making maintenance and replacement more convenient.

[0053] The above are only exemplary embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A drilling rig power head buffer device, characterized in that: The drilling rig power head buffer device (100) comprises an outer hub (1), a tension sleeve (2), a connecting assembly (3), a floating joint (4), a threaded fastener (5) and a main shaft (6), wherein the tension sleeve (2) is sleeved on the outer wall of the main shaft (6), the outer hub (1) is sleeved on the outer wall of the tension sleeve (2), the tension sleeve (2) can limit the movement of the outer hub (1) relative to the main shaft (6), the outer hub (1) is detachably connected to the connecting assembly (3) via the threaded fastener (5), the floating joint (4) is detachably connected to the main shaft (6), and the floating joint (4) is detachably connected to the main shaft (6). The main shaft (6) is slidably matched, the connecting component (3) is sleeved on the outer wall of the floating joint (4), the outer wall of the floating joint (4) protrudes outward to form a first boss (41), and the inner wall of the connecting component (3) protrudes inward to form a second boss (311), the first boss (41) can abut against the second boss (311) to limit the floating joint (4) from sliding in the axial direction of the main shaft (6) in a direction away from the outer hub (1), and the end of the floating joint (4) away from the main shaft (6) is used for connecting with a drill pipe.

2. The drilling rig power head buffer device according to claim 1, characterized in that: The outer hub (1) is provided with a first mounting hole (11), the connecting assembly (3) is provided with a second mounting hole (312) corresponding to the first mounting hole (11), and the threaded fastener (5) is used to pass through the first mounting hole (11) and be threadedly connected to the second mounting hole (312); The number of the first mounting holes (11) is multiple, and the multiple first mounting holes (11) are arranged at intervals along the circumference of the outer hub (1); the number of the second mounting holes (312) is consistent with the number of the first mounting holes (11) and are arranged one-to-one; the number of the threaded fasteners (5) is consistent with the number of the first mounting holes (11) and are arranged one-to-one.

3. The drilling rig power head buffer device according to claim 1, characterized in that: The outer wall of the main shaft (6) is provided with an optical axis section (61) and an external spline section (62) in sequence along the axial direction of the main shaft (6); the tension sleeve (2) is sleeved on the outer wall of the optical axis section (61); an internal spline section (42) is provided at one end of the floating joint (4) close to the outer hub (1); the internal spline section (42) is slidably matched with the external spline section (62).

4. The drilling rig power head buffer device according to claim 3, characterized in that: A threaded section (63) is also provided between the optical axis section (61) and the external spline section (62), and two ends of the threaded section (63) are respectively connected to the optical axis section (61) and the external spline section (62). The drilling rig power head buffer device (100) further comprises a screw sleeve (7), the screw sleeve (7) is sleeved on the main shaft (6) and is spirally matched with the threaded section (63), and two sides of the screw sleeve (7) can respectively abut against the outer hub (1) and the connecting assembly (3).

5. The drilling rig power head buffer device according to claim 4, characterized in that: A first positioning arc groove (71) and a second positioning arc groove (72) are respectively provided on both sides of the screw sleeve (7); the outer hub (1) can abut against the inner wall of the first positioning arc groove (71) so that the axis of the outer hub (1) is parallel to the axis of the main shaft (6); the connecting component (3) can abut against the inner wall of the second positioning arc groove (72) so that the axis of the connecting component (3) is parallel to the axis of the main shaft (6).

6. The drilling rig power head buffer device according to claim 4, characterized in that: The connecting assembly (3) comprises a connecting seat (31) and a shaft sleeve (32); the outer hub (1) is detachably connected to the connecting seat (31) via the threaded fastener (5); the inner wall of the connecting seat (31) protrudes to form the second boss (311); the connecting seat (31) and the shaft sleeve (32) are both sleeved on the outer wall of the floating joint (4); the two ends of the shaft sleeve (32) are respectively abutted against the threaded sleeve (7) and the second boss (311); the outer wall of the shaft sleeve (32) is abutted against the inner wall of the connecting seat (31); and the inner wall of the shaft sleeve (32) is slidably matched with the outer wall of the floating joint (4).

7. The drilling rig power head buffer device according to claim 6, characterized in that: The connecting seat (31) is provided with a first lubrication hole (313) so that a lubricant can lubricate the shaft sleeve (32) through the first lubrication hole (313).

8. The drilling rig power head buffer device according to any one of claims 1 to 7, characterized in that: The drilling rig power head buffer device (100) also includes an inner sleeve (8), one end of which is detachably connected to the main shaft (6), and the other end of which is inserted into the floating joint (4) and slidably matched with the floating joint (4).

9. The drilling rig power head buffer device according to claim 8, characterized in that: The drilling rig power head buffer device (100) further comprises a first sealing member (9), the inner sleeve (8) is provided with a first annular groove (81) for accommodating the first sealing member (9), and the first sealing member (9) is used to abut against the inner wall of the main shaft (6); and / or, The drilling rig power head buffer device (100) further comprises a second sealing member (110), and a second annular groove (43) for accommodating the second sealing member (110) is provided on the floating joint (4), and the second sealing member (110) is used to abut against the outer wall of the inner sleeve (8).

10. The drilling rig power head buffer device according to any one of claims 1 to 7, characterized in that: The drilling rig power head buffer device (100) further comprises a third seal (120); an end of the connecting assembly (3) away from the outer hub (1) is provided with a third annular groove (314) for accommodating the third seal (120); and the third seal (120) is used to abut against the outer wall of the floating joint (4).

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