A drilling rig shock and vibration mitigation connector

Abstract

This invention discloses a drilling rig vibration damping and buffering connector, including an upper connector, an intermediate housing, a floating output shaft, an axial vibration damping component, and a circumferential vibration damping component. The upper connector is fixedly connected to one end of the intermediate housing, and one end of the floating output shaft is slidably inserted into the interior of the intermediate housing. The axial vibration damping component is used to buffer and eliminate axial vibration; the circumferential vibration damping component is used to buffer and eliminate circumferential vibration. This invention achieves multi-dimensional, all-condition vibration damping and buffering effects. The axial component adopts a mating disc spring combination structure, which effectively buffers and eliminates axial vibration. The energy storage effect of the disc spring reduces the energy transmission loss of the drilling system. The circumferential component adopts a trapezoidal cross-section circumferential buffer pad, which simultaneously achieves radial vibration damping while buffering circumferential vibration.

Description

Technical Field

[0001] This invention relates to the field of mining machinery and equipment technology, and in particular to a drilling rig shock absorption connector. Background Technology

[0002] Down-the-hole (DHH) drilling rigs, as the most widely used core equipment in mining, operate by rotating the spindle of a slewing power head, which, in conjunction with compressed air, drives a drilling system consisting of drill rods, a DHH impactor, and a drill bit. During actual drilling, complex and intense alternating vibration shock waves are generated. These shock waves are gradually transmitted to the entire rig through the slewing power head, the feed beam, and the rig body. This not only causes energy loss and reduces drilling efficiency but also easily leads to a series of equipment failures, including drill rod breakage, weld cracking of structural components, loosening of connectors, wear of bushings, and accelerated wear of bearings and gears inside the slewing power head. Consequently, this significantly shortens the overall service life of the DHHH rig, reduces maintenance intervals, and increases operating costs. Therefore, cutting off or weakening the transmission of vibration shock waves during drilling has become a key breakthrough in improving the product quality and operational performance of DHHH rigs.

[0003] The existing matching drilling rig connectors only use a single axial buffer structure in their internal structure, which has low buffering and vibration absorption effect and cannot achieve effective shock absorption and equipment protection. Summary of the Invention

[0004] The purpose of this invention is to provide a drilling rig vibration damping connector to solve the technical problem that the existing drilling rig connectors have low vibration damping effect due to the use of a single axial buffer in their internal structure.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A drilling rig vibration damping connector includes an upper connector, an intermediate housing, a floating output shaft, an axial vibration damping component, and a circumferential vibration damping component.

[0007] The upper connector is fixedly connected to one end of the intermediate housing, and one end of the floating output shaft is slidably inserted into the inside of the intermediate housing;

[0008] The axial damping assembly is located inside the middle housing at the end away from the floating output shaft, and is situated between the upper connector and the end of the floating output shaft. The axial damping assembly is used to buffer and eliminate axial vibration.

[0009] The circumferential damping component is located inside the intermediate housing and in the circumferential gap between the intermediate housing and the floating output shaft. The circumferential damping component is used to buffer and eliminate circumferential vibration.

[0010] As a preferred embodiment of the present invention, the axial damping assembly includes at least one set of disc spring assembly structures, the disc spring assembly structures including two disc springs, the two disc springs being arranged in a counter-position.

[0011] As a preferred embodiment of the present invention, a plurality of first protrusions are fixedly connected to the inner wall of the intermediate housing. The plurality of first protrusions are distributed along the circumference of the intermediate housing, and an installation area is formed between two adjacent first protrusions. A second protrusion corresponding to the installation area is fixedly connected to the outer wall of one end of the floating output shaft that extends into the interior of the intermediate housing. The second protrusion is inserted into the corresponding installation area, and the outer wall of the second protrusion is in sliding contact with the inner wall of the intermediate housing.

[0012] The circumferential damping assembly includes a circumferential buffer pad, which is disposed between the first protrusion and the second protrusion, with one side of the circumferential buffer pad abutting against one side of the first protrusion and the other side of the circumferential buffer pad abutting against one side of the second protrusion.

[0013] As a further aspect of the present invention, the cross-section of the circumferential buffer pad is trapezoidal, and the circumferential buffer pad can deform radially along the intermediate shell and abut against the inner wall of the intermediate shell when compressed.

[0014] As a further embodiment of the present invention, the second protrusion divides the corresponding mounting area into two mounting gaps, and the circumferential buffer pad is only provided in the mounting gap corresponding to the drilling rotation direction of the drilling rig.

[0015] As a preferred embodiment of the present invention, it further includes a lower end cover and a lower buffer pad. The lower end cover is fixedly connected to the opening at the end of the intermediate housing away from the upper connector by an internal hex bolt. The lower buffer pad is located between the lower end face of the second protrusion and the lower end cover.

[0016] As a further embodiment of the present invention, it also includes a guide wear-resistant belt, which is slidably sleeved on the lower outer wall of the floating output shaft, and the guide wear-resistant belt is embedded in the inner wall of the lower end cover.

[0017] As a further embodiment of the present invention, it also includes an air guide tube, which is disposed inside the intermediate housing. One end of the air guide tube is slidably inserted into the interior of the upper connector, and the other end of the air guide tube is slidably inserted into the interior of the floating output shaft near the upper connector. The two ends of the air guide tube are respectively connected to the air inlet of the upper connector and the air outlet of the floating output shaft. A disc spring is slidably sleeved on the air guide tube.

[0018] As a further aspect of the present invention, a sealing element is also included. The sealing element includes a first shaft sealing ring, a second shaft sealing ring, a dustproof ring, and an O-ring. Two first shaft sealing rings are provided, which are respectively embedded in the interior of the upper connector and the interior of the floating output shaft. The two ends of the air guide tube are slidably sealed to the upper connector and the floating output shaft respectively through the two first shaft sealing rings. The second shaft sealing ring is fixedly embedded in the inner wall of the lower end cover, and the inner wall of the second shaft sealing ring is in slidable sealing contact with the outer wall of the floating output shaft. The dustproof ring is fixedly embedded in the inner wall of the lower end cover at the end away from the upper connector, and the inner wall of the dustproof ring is in slidable sealing contact with the outer wall of the floating output shaft. The O-ring is located at the connection between the upper connector and the intermediate housing.

[0019] As a further preferred embodiment of the present invention, the intermediate housing is provided with a first grease nipple for adding grease to the inside of the intermediate housing, and the lower end cover is provided with a second grease nipple for adding grease to the outer wall of the floating output shaft.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] This invention achieves multi-dimensional, all-condition vibration reduction and buffering effects through its structure. The axial structure adopts a combination of mating disc springs, which can not only effectively buffer and eliminate axial vibration, but also reduce the energy transfer loss of the drilling system through the energy storage effect of the disc springs. The circumferential structure adopts a trapezoidal cross-section circumferential buffer pad, which can simultaneously achieve radial vibration reduction while achieving circumferential vibration buffering.

[0022] Vibration reduction is achieved under drilling rig lifting conditions by using a lower buffer pad, completing full-condition vibration reduction coverage for drilling and lifting. This effectively cuts off or reduces the transmission of alternating complex vibration shock waves generated by the drilling system. The air guide pipe provides a stable delivery channel for compressed air and provides radial positioning for the disc spring, ensuring axial vibration reduction effect.

[0023] Multiple seals ensure all-around sealing of the connector, preventing compressed air leakage to maintain drilling power and blocking external dust and impurities from entering, protecting internal moving parts; the guide wear-resistant belt ensures the coaxiality of the floating output shaft, reducing yaw vibration and sliding wear. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only examples of embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the main structure of an embodiment of the present invention;

[0027] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure at position AA;

[0028] Figure 4 This is a schematic diagram of the structure of the intermediate shell in an embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of the floating output shaft in an embodiment of the present invention;

[0030] Figure 6 This is a top view of the structure according to an embodiment of the present invention;

[0031] Figure 7 for Figure 6 Cross-sectional view of the BB location.

[0032] Figure label:

[0033] 1. Upper connector; 2. Intermediate housing; 201. First protrusion; 3. Air guide pipe; 4. Lower end cover; 5. Floating output shaft; 501. Second protrusion; 6. Disc spring; 7. Lower buffer pad; 8. Circumferential buffer pad; 9. First shaft seal ring; 10. Second shaft seal ring; 11. Guide wear-resistant belt; 12. Dustproof ring; 13. Socket head bolt; 14. O-ring seal; 15. First grease filler nozzle; 16. Second grease filler nozzle. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0035] In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention.

[0036] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to the internal connection of two components; they can refer to a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present invention can be understood according to the specific circumstances.

[0037] See Figures 1 to 7 As shown in the figure, an embodiment of the present invention provides a drilling rig vibration damping and buffer connector, including an upper connector 1, an intermediate housing 2, a floating output shaft 5, an axial vibration damping component, and a circumferential vibration damping component.

[0038] The upper connector 1 is fixedly connected to one end of the intermediate housing 2, and one end of the floating output shaft 5 is slidably inserted into the interior of the intermediate housing 2.

[0039] The axial damping assembly is located inside the middle housing 2 at the end away from the floating output shaft 5, and is located between the upper connector 1 and the end of the floating output shaft 5. The axial damping assembly is used to buffer and eliminate axial vibration.

[0040] The circumferential damping component is installed inside the intermediate housing 2 and located in the circumferential gap between the intermediate housing 2 and the floating output shaft 5. The circumferential damping component is used to buffer and eliminate circumferential vibration.

[0041] The above technical solution utilizes the upper connector 1 to achieve a fixed connection with the main spindle of the drilling rig's rotary power head, providing an installation foundation for the drilling rig's vibration damping and buffering connector. The intermediate housing 2 serves as the core installation carrier, providing space for the axial vibration damping components, circumferential vibration damping components, and floating output shaft 5. The floating output shaft 5 is slidably inserted into the intermediate housing 2, enabling flexible axial and circumferential movement. The axial vibration damping components are precisely positioned inside the intermediate housing 2 between the upper connector 1 and the end of the floating output shaft 5, directly receiving and buffering the axial vibration transmitted by the floating output shaft 5. The circumferential vibration damping components are precisely positioned at the circumferential gap between the intermediate housing 2 and the floating output shaft 5, directly receiving and buffering the circumferential vibration transmitted between them. By independently setting the axial and circumferential vibration damping components in separate areas, targeted vibration damping for axial and circumferential vibrations is achieved, structurally cutting off the transmission path of vibration shock waves from the drilling system to the drilling rig body.

[0042] In this embodiment of the invention, the axial damping component includes at least one set of disc spring assembly structures, the disc spring assembly structure including two disc springs 6, the two disc springs 6 being arranged in a counter-position.

[0043] In the above technical solution, the axial damping component is set as at least one set of disc spring combination structure, and each set of disc spring combination structure consists of two disc springs 6 arranged in a mating manner. The mating arrangement allows the disc springs 6 to form nonlinear stiffness, effectively improving the adaptability and effect of axial buffering. The disc springs 6 themselves have good elastic deformation capacity, and can absorb the axial vibration energy transmitted by the floating output shaft 5 through their own deformation, thereby achieving the buffering and elimination of axial vibration. At the same time, the disc springs 6 also have an energy storage effect, which can store the absorbed vibration energy and release it during drilling operations, reducing the energy transmission loss of the drilling system. Multiple sets of disc spring combination structures can be flexibly adapted according to the actual drilling load of the down-the-hole drill rig to meet the axial damping requirements of different working conditions.

[0044] In this embodiment of the invention, a plurality of first protrusions 201 are fixedly connected to the inner wall of the intermediate housing 2. The plurality of first protrusions 201 are distributed along the circumference of the intermediate housing 2. An installation area is formed between two adjacent first protrusions 201. A second protrusion 501 corresponding to the installation area is fixedly connected to the outer wall of one end of the floating output shaft 5 that extends into the interior of the intermediate housing 2. The second protrusion 501 is inserted into the corresponding installation area. The outer wall of the second protrusion 501 is in sliding contact with the inner wall of the intermediate housing 2.

[0045] The circumferential damping component includes a circumferential buffer pad 8, which is disposed between the first protrusion 201 and the second protrusion 501. One side of the circumferential buffer pad 8 abuts against one side of the first protrusion 201, and the other side of the circumferential buffer pad 8 abuts against one side of the second protrusion 501.

[0046] In the above technical solution, a plurality of first protrusions 201 are arranged circumferentially on the inner wall of the intermediate housing 2, and adjacent first protrusions 201 form an installation area. Second protrusions 501 corresponding to the installation area are arranged on the outer wall of the floating output shaft 5, and the second protrusions 501 are inserted into the installation area to achieve precise circumferential matching between the intermediate housing 2 and the floating output shaft 5. The outer wall of the second protrusion 501 slides in contact with the inner wall of the intermediate housing 2 to ensure the axial and circumferential sliding movement of the floating output shaft 5 in the intermediate housing 2. At the same time, a circumferential buffer pad 8 is arranged between the first protrusions 201 and the second protrusions 501 and abuts tightly against them. When the intermediate housing 2 transmits rotational torque to the floating output shaft 5, the torque can be stably transmitted through the first protrusions 201, the circumferential buffer pad 8, and the second protrusions 501. The circumferential vibration generated by the rock drilling operation will be transmitted to the circumferential buffer pad 8 through the first protrusions 201 or the second protrusions 501. The circumferential buffer pad 8 absorbs the circumferential vibration energy through its own elastic deformation to achieve buffering and elimination of circumferential vibration.

[0047] In this embodiment of the invention, the cross-section of the circumferential buffer pad 8 is trapezoidal. When the circumferential buffer pad 8 is compressed, it can deform radially along the intermediate shell 2 and abut against the inner wall of the intermediate shell 2. By setting the cross-section of the circumferential buffer pad 8 to be trapezoidal, and utilizing the force decomposition characteristics of the trapezoidal structure, when the circumferential buffer pad 8 is subjected to the circumferential extrusion force of the first protrusion 201 and the second protrusion 501, its force direction is effectively decomposed. It can not only generate elastic deformation along the circumferential direction to absorb circumferential vibration energy, but also generate radial deformation along the intermediate shell 2. During the deformation process, the circumferential buffer pad 8 will tightly abut against the inner wall of the intermediate shell 2. This radial abutment can effectively counteract the radial vibration generated by the periodic movement during rock drilling operations, allowing the circumferential buffer pad 8 to simultaneously complete radial vibration reduction while achieving circumferential vibration reduction, achieving a dual-purpose vibration reduction effect, and further cutting off the transmission path of radial vibration shock waves.

[0048] The second protrusion 501 divides the corresponding installation area into two installation gaps. The circumferential buffer pad 8 is only installed in the installation gap corresponding to the drilling rotation direction of the drilling rig. By using the second protrusion 501 to precisely divide each installation area into two installation gaps, and only installing the circumferential buffer pad 8 in the installation gap corresponding to the drilling rotation direction of the drilling rig, while not installing the circumferential buffer pad 8 in the installation gap in the non-drilling rotation direction, this arrangement can effectively reduce the number of circumferential buffer pads 8 used, reduce structural design and manufacturing costs, and at the same time avoid the circumferential buffer pad 8 being subjected to ineffective compressive force in the non-drilling rotation direction, reduce unnecessary wear, significantly improve the service life of the circumferential buffer pad 8, and accurately adapt to the drilling rotation conditions in a single direction of the drilling rig.

[0049] The circumferential buffer pads 8 can be distributed equidistantly or non-equidistantly to flexibly adapt to different drilling conditions and rock formation stress characteristics of down-the-hole drills. When equidistantly distributed for conventional drilling conditions such as homogeneous hard rock, it can ensure the uniformity of circumferential torque transmission and the consistency of the full circumferential damping effect. When non-equidistantly distributed for complex drilling conditions such as heterogeneous rock formations and localized high torque stress, the circumferential buffer pads 8 can be densified or added at the circumferential positions where the torque stress is concentrated, which can precisely improve the circumferential damping capacity and torque transmission stability at local positions. At the same time, by combining the setting of the drilling rotation direction and the absence of the setting in the non-drilling rotation direction, the ineffective wear of the circumferential buffer pads 8 can be reduced on the basis of optimizing the damping effect, further improving the overall adaptability and service life of the connector.

[0050] The embodiments of the present invention also include a lower end cover 4 and a lower buffer pad 7. The lower end cover 4 is fixedly connected to the opening of the middle housing 2 away from the upper connector 1 by an internal hex bolt 13. The lower buffer pad 7 is located between the lower end face of the second protrusion 501 and the lower end cover 4.

[0051] The above technical solution uses hexagonal socket head caps 13 to fix the lower end cover 4 at the opening of the intermediate housing 2 away from the upper connector 1. The lower end cover 4 is used to axially limit and protect the floating output shaft 5, circumferential buffer pad 8 and other components inside the intermediate housing 2, preventing the internal components from coming out of the intermediate housing 2 during drilling operations. At the same time, a lower buffer pad 7 is set between the lower end face of the second protrusion 501 and the lower end cover 4. When the drilling rig lifts the drill rod, down-the-hole impactor and drill bit by rotating the power head, the floating output shaft 5 will be subjected to an upward lifting force. This lifting force will be stably transmitted to the lower buffer pad 7 through the second protrusion 501. The lower buffer pad 7 absorbs the vibration energy generated during the lifting process through its own elastic deformation, thereby achieving the buffering and elimination of vibration under the lifting condition, effectively supplementing the vibration reduction range of the axial vibration reduction component, and realizing full-condition vibration reduction during drilling and lifting operations.

[0052] The embodiments of the present invention also include a guide wear-resistant belt 11, which is slidably sleeved on the lower outer wall of the floating output shaft 5 and embedded in the inner wall of the lower end cover 4.

[0053] The above technical solution involves sliding the guide wear-resistant belt 11 onto the lower outer wall of the floating output shaft 5 and firmly embedding it into the inner wall of the lower end cover 4. The guide wear-resistant belt 11 provides reliable radial support and sliding guidance for the lower end of the floating output shaft 5, ensuring the coaxiality of the floating output shaft 5 when it moves axially and circumferentially within the intermediate housing 2. This avoids additional vibration and impact caused by the sway of the floating output shaft 5. At the same time, the guide wear-resistant belt 11 can effectively isolate the floating output shaft 5 from direct contact with the lower end cover 4, reducing sliding wear between the two and significantly improving the service life of the floating output shaft 5 and the lower end cover 4, thus adapting to the long-term reciprocating motion conditions of the floating output shaft 5.

[0054] The embodiment of the present invention also includes an air guide tube 3, which is disposed inside the intermediate housing 2. One end of the air guide tube 3 is slidably inserted into the interior of the upper connector 1, and the other end of the air guide tube 3 is slidably inserted into the interior of the floating output shaft 5 near the upper connector 1. The two ends of the air guide tube 3 are respectively connected to the air inlet of the upper connector 1 and the air outlet of the floating output shaft 5. The disc spring 6 is slidably sleeved on the air guide tube 3.

[0055] The above technical solution involves setting an air guide pipe 3 inside the intermediate housing 2, with both ends of the air guide pipe 3 slidably inserted into the upper connector 1 and the floating output shaft 5, respectively, to achieve precise connection with the air inlet of the upper connector 1 and the air outlet of the floating output shaft 5. This provides a dedicated sealed delivery channel for compressed air, allowing the compressed air from the main shaft of the drilling rig's rotary power head to be stably delivered to the down-the-hole impactor sequentially through the upper connector 1, the air guide pipe 3, and the floating output shaft 5, providing continuous power for rock drilling operations. At the same time, a disc spring 6 is slidably sleeved on the air guide pipe 3, using the air guide pipe 3 to provide reliable radial positioning for the disc spring 6, preventing radial wobble during the elastic deformation of the disc spring 6 and ensuring the axial buffering effect of the disc spring 6. The sliding insertion of the air guide pipe 3 can flexibly adapt to the axial movement of the floating output shaft 5, preventing the air passage from bending or breaking due to the movement of the floating output shaft 5.

[0056] The embodiments of the present invention also include sealing components, which include a first shaft sealing ring 9, a second shaft sealing ring 10, a dustproof ring 12, and an O-ring 14. Two first shaft sealing rings 9 are provided, which are respectively embedded in the interior of the upper connector 1 and the interior of the floating output shaft 5. The two ends of the air guide tube 3 are slidably sealed to the upper connector 1 and the floating output shaft 5 through the two first shaft sealing rings 9 respectively. The second shaft sealing ring 10 is fixedly embedded in the inner wall of the lower end cover 4, and the inner wall of the second shaft sealing ring 10 is in slidable sealing contact with the outer wall of the floating output shaft 5. The dustproof ring 12 is fixedly embedded in the inner wall of the lower end cover 4 away from the upper connector 1, and the inner wall of the dustproof ring 12 is in slidable sealing contact with the outer wall of the floating output shaft 5. The O-ring 14 is located at the connection between the upper connector 1 and the intermediate housing 2.

[0057] The above technical solution consists of a multi-seal component comprising a first shaft seal ring 9, a second shaft seal ring 10, a dustproof ring 12, and an O-ring seal 14. The two first shaft seal rings 9 are respectively embedded inside the upper connector 1 and the floating output shaft 5, achieving a sliding seal between the air guide pipe 3 and the upper connector 1 and the floating output shaft 5, effectively preventing compressed air from leaking out from the insertion gap of the air guide pipe 3. The second shaft seal ring 10 is embedded in the inner wall of the lower end cover 4 and slides in sealing contact with the outer wall of the floating output shaft 5, preventing grease from leaking out from the mating gap between the floating output shaft 5 and the lower end cover 4. To prevent leakage, the dustproof ring 12 is embedded in the inner wall of the lower end cover 4 away from the upper connector 1 and in close contact with the outer wall of the floating output shaft 5. This effectively prevents dust, sand and other impurities in the mining environment from entering the connector, avoiding wear and jamming of internal moving parts caused by impurities. The O-ring seal 14 is set at the connection between the upper connector 1 and the intermediate housing 2 to achieve static sealing between the two and prevent grease from leaking out from the connection surface. Through the synergistic cooperation of multiple sealing structures, the connector achieves all-round sealing, ensuring the air circuit sealing and the protection effect of internal components.

[0058] In this embodiment of the invention, the intermediate housing 2 is provided with a first grease nipple 15 for adding grease to the inside of the intermediate housing 2, and the lower end cover 4 is provided with a second grease nipple 16 for adding grease to the outer wall of the floating output shaft 5.

[0059] A first grease nipple 15 is provided on the intermediate housing 2, through which grease can be conveniently added to the inside of the intermediate housing 2. The grease can be evenly adhered to the contact surfaces between the intermediate housing 2 and the floating output shaft 5, the first protrusion 201 and the second protrusion 501, the circumferential buffer pad 8 and each protrusion, effectively reducing the friction between these moving mating surfaces, reducing additional vibration and component wear caused by friction. A second grease nipple 16 is provided on the lower end cover 4, through which grease can be precisely added to the outer wall of the floating output shaft 5. The grease can smoothly enter the sliding mating surfaces between the floating output shaft 5 and the guide wear-resistant belt 11 and the second shaft seal ring 10, reducing sliding friction, improving the smoothness of sliding mating, and further extending the service life of each moving part.

[0060] The circumferential buffer pad 8 has a trapezoidal cross-section, and its circumferential compression ΔC and radial deformation ΔR satisfy the following relationship equation:

[0061]

[0062] in:

[0063] ΔR: Radial deformation (mm);

[0064] ΔC: Circumferential compression (mm);

[0065] H: Radial height (mm) of the trapezoidal cross-section of the circumferential buffer pad;

[0066] θ: The angle (°) between the side of the trapezoid and the radial normal;

[0067] ν: Poisson's ratio (dimensionless) of the circumferential cushioning material;

[0068] K: Structural correction factor, ranging from 0.85 to 0.98, determined by the contact friction characteristics between the buffer pad and the inner wall of the intermediate shell.

[0069] Example: Design input: H=12mm; θ=15°; ν=0.48 (polyurethane material); K=0.92 (empirical value); expected circumferential compression ΔC=1.2mm.

[0070] Calculation process:

[0071]

[0072]

[0073] Engineering assessment:

[0074] The radial deformation is about 1.14 mm, which is sufficient to make the outer edge of the buffer pad fit tightly against the inner wall of the middle shell, forming effective radial support, while not exceeding the elastic limit, thus meeting the requirements for shock absorption and wear resistance.

[0075] Technical effects:

[0076] Precisely design the radial deformation amount: avoid permanent deformation of the gasket due to overpressure or vibration damping failure due to underpressure;

[0077] Achieve dual-purpose control for the pad: elevate the radial vibration reduction function of the circumferential buffer pad from a qualitative description to a quantitative design;

[0078] Improve connector lifespan and stability: Reduce floating output shaft yaw vibration and decrease guide wear band wear by controlling radial contact force;

[0079] It has adaptive design capabilities: parameters can be adjusted according to different models, torque, and materials to quickly complete serialized designs.

[0080] When using the above technical solution, the upper connector 1 of the connector is fixedly connected to the main spindle of the drilling rig's rotary power head by a thread, the floating output shaft 5 of the connector is fixedly connected to the drill rod by a thread, and the lower end of the drill rod is connected to the down-the-hole impactor and the drill bit in sequence, thus completing the overall installation of the connector and the drilling rig's drilling system.

[0081] After the drilling rig starts, the rotary power head spindle drives the upper connector 1 and the intermediate housing 2 to rotate. The rotational torque is transmitted to the floating output shaft 5 through the first protrusion 201, the circumferential buffer pad 8, and the second protrusion 501, which in turn drives the drill rod, down-the-hole impactor, and drill bit to rotate. At the same time, the compressed air of the drilling rig enters the air guide pipe 3 through the air inlet of the upper connector 1 and is delivered to the down-the-hole impactor through the air outlet of the floating output shaft 5, driving the drill bit to make axial impact motion. The rotational motion of the drill bit and the axial impact motion are superimposed to achieve rock breaking. The axial vibration generated by the reaction force of rock breaking is buffered and eliminated by the disc spring 6, and the circumferential vibration is buffered and eliminated by the circumferential buffer pad 8. After being compressed, the circumferential buffer pad 8 deforms radially and abuts against the inner wall of the intermediate housing 2 to achieve radial vibration reduction. When the drilling rig needs to lift the drill bit, the rotary power head drives the upper connector 1 and the intermediate housing 2 to move upward. The lifting force on the floating output shaft 5 is transmitted to the lower buffer pad 7 through the second protrusion 501, and the vibration generated during the lifting process is buffered and eliminated by the lower buffer pad 7. During operation, multiple seals ensure the sealing of compressed air and protection against external impurities, while lubricating grease continuously reduces frictional wear on all moving surfaces.

[0082] After the work is completed, regularly check the connection status of each component of the connector and tighten any loose hex bolts 13 in a timely manner; replenish grease every 15-20 working days through the first grease filler nozzle 15 and the second grease filler nozzle 16; regularly replace worn seals, guide wear-resistant strips 11 and circumferential buffer pads 8 to ensure the shock absorption and working performance of the connector.

[0083] The above description illustrates the basic principles of the present invention. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The above embodiments and descriptions in the specification are only for illustrating the principles of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and scope of the present invention without departing from the scope of the present invention should be included within the protection scope of the present invention.

Claims

1. A drilling rig vibration damping and buffer connector, characterized in that: Includes an upper connector (1), an intermediate housing (2), a floating output shaft (5), an axial damping assembly, and a circumferential damping assembly; The upper connector (1) is fixedly connected to one end of the intermediate housing (2), and one end of the floating output shaft (5) is slidably inserted into the interior of the intermediate housing (2); The axial damping assembly is disposed inside the middle housing (2) at the end away from the floating output shaft (5), and the axial damping assembly is located between the upper connector (1) and the end of the floating output shaft (5). The axial damping assembly buffers and eliminates axial vibration. The circumferential damping component is disposed inside the intermediate housing (2) and located in the circumferential gap between the intermediate housing (2) and the floating output shaft (5). The circumferential damping component is used to buffer and eliminate circumferential vibration.

2. The drilling rig vibration damping connector according to claim 1, characterized in that: The axial damping assembly includes at least one set of disc spring combination structures, the disc spring combination structure including two disc springs (6), the two disc springs (6) being arranged in a paired manner.

3. The drilling rig vibration damping connector according to claim 1, characterized in that: The inner wall of the intermediate housing (2) is fixedly connected with a plurality of first protrusions (201). The plurality of first protrusions (201) are distributed along the circumference of the intermediate housing (2). An installation area is formed between two adjacent first protrusions (201). The outer wall of one end of the floating output shaft (5) that extends into the interior of the intermediate housing (2) is fixedly connected with a second protrusion (501) that corresponds one-to-one with the installation area. The second protrusion (501) is inserted into the corresponding installation area. The outer wall of the second protrusion (501) is in sliding contact with the inner wall of the intermediate housing (2). The circumferential damping component includes a circumferential buffer pad (8), which is disposed between a first protrusion (201) and a second protrusion (501). One side of the circumferential buffer pad (8) abuts against one side of the first protrusion (201), and the other side of the circumferential buffer pad (8) abuts against one side of the second protrusion (501).

4. A drilling rig vibration damping connector according to claim 3, characterized in that: The cross-section of the circumferential buffer pad (8) is trapezoidal. When the circumferential buffer pad (8) is compressed, it can deform radially along the intermediate shell (2) and abut against the inner wall of the intermediate shell (2).

5. A drilling rig vibration damping connector according to claim 4, characterized in that: The second protrusion (501) divides the corresponding installation area into two installation gaps, and the circumferential buffer pad (8) is only set in the installation gap corresponding to the drilling rotation direction of the drilling rig.

6. A drilling rig vibration damping connector according to claim 1, characterized in that: It also includes a lower end cover (4) and a lower buffer pad (7). The lower end cover (4) is fixedly connected to the opening of the middle housing (2) away from the upper connector (1) by an internal hex bolt (13). The lower buffer pad (7) is located between the lower end face of the second protrusion (501) and the lower end cover (4).

7. A drilling rig vibration damping and buffer connector according to claim 6, characterized in that: It also includes a guide wear-resistant belt (11), which is slidably sleeved on the lower outer wall of the floating output shaft (5) and is embedded in the inner wall of the lower end cover (4).

8. A drilling rig vibration damping connector according to claim 7, characterized in that: It also includes an air guide tube (3), which is disposed inside the intermediate housing (2). One end of the air guide tube (3) is slidably inserted into the interior of the upper connector (1), and the other end of the air guide tube (3) is slidably inserted into the interior of the floating output shaft (5) near the upper connector (1). The two ends of the air guide tube (3) are respectively connected to the air inlet of the upper connector (1) and the air outlet of the floating output shaft (5). The disc spring (6) is slidably sleeved on the air guide tube (3).

9. A drilling rig vibration damping connector according to claim 8, characterized in that: It also includes sealing components, which include a first shaft sealing ring (9), a second shaft sealing ring (10), a dustproof ring (12), and an O-ring (14). Two first shaft sealing rings (9) are provided, each embedded inside the upper connector (1) and the floating output shaft (5), respectively. The two ends of the air guide pipe (3) are slidably and sealingly connected to the upper connector (1) and the floating output shaft (5) respectively through the two first shaft sealing rings (9). The second shaft sealing ring (10) is fixedly embedded in the inner wall of the lower end cover (4). The inner wall of the second shaft sealing ring (10) is in sliding sealing contact with the outer wall of the floating output shaft (5). The dustproof ring (12) is fixedly embedded in the inner wall of the lower end cover (4) away from the upper connector (1). The inner wall of the dustproof ring (12) is in sliding sealing contact with the outer wall of the floating output shaft (5). The O-ring sealing ring (14) is located at the connection between the upper connector (1) and the intermediate housing (2).

10. A drilling rig vibration damping connector according to any one of claims 1-9, characterized in that: The intermediate housing (2) is provided with a first grease nipple (15) for adding grease to the inside of the intermediate housing (2), and the lower end cover (4) is provided with a second grease nipple (16) for adding grease to the outer wall of the floating output shaft (5).

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