Torsional shock assembly and variable frequency shaft torsional coupling shock drilling speed-up tool

Abstract

This invention relates to the field of oil drilling tool technology, specifically a torsional impact assembly and a variable frequency shaft-torsional coupling impact drilling speed-up tool. The former includes a drill pipe, a housing, a torsional impact shell, and a torsional impact hammer. The invention has a reasonable and compact structure. In use, the torsional impact assembly is installed near the drill bit on a screw drill string. The housing is fixed to the screw drill string housing. The upper part of the drill pipe is connected to the drill collar, and the lower part is connected to the drill bit. The torsional rotary table is fixed in place by the housing. When the screw drill string is running, the torsional impact shell rotates and compresses the first elastic reset member. When the push rod moves outward to its farthest point, it is no longer blocked by the cam block. At this time, the first elastic reset member begins to extend and reset, pushing the torsional impact hammer to its initial position and impacting the torsional impact shell. Thus, the impact force of the torsional impact hammer on the torsional impact shell forms a torsional impact on the drill pipe, thereby transmitting the torsional impact to the drill bit through the drill pipe.

Description

Technical Field

[0001] This invention relates to the field of oil drilling tool technology, and is a torsional impact assembly and a variable frequency shaft-torsional coupling impact drilling speed-up tool. Background Technology

[0002] As oil exploration and development continue to deepen, there are more and more special and complex wells such as deep wells, ultra-deep wells, and horizontal wells with large displacement, which makes the drilling speed slower and slower, seriously restricting the speed and cost of oil and gas exploration and development.

[0003] During drilling, the contact and friction between the drill string and the wellbore prevent the effective transmission of drilling pressure and torque to the drill bit, resulting in "drag" or "stick-slip" phenomena. These phenomena become increasingly pronounced with increasing well inclination angle, the formation of cuttings beds, and the increase in the difference between the wellbore fluid column pressure and the formation pore pressure. In severe cases, drilling pressure cannot be applied to the drill bit at all, leading to halting drilling or causing stick-slip vibrations in the drill bit, accelerating its damage and failure. Conventional methods for reducing friction and torque between the drill string and the wellbore include optimizing the wellbore structure and mud properties, reducing or avoiding the formation of cuttings beds, improving mud cake quality, and employing rotary steerable drilling and underbalanced or near-balanced drilling methods. However, these techniques all have limitations and their effectiveness is limited.

[0004] Studies have shown that vibration can alter the friction state between friction pairs, reducing their friction coefficient. Vibration drag reduction technology has been widely applied in various engineering fields. As a controllable active drag reduction technology, its application in drill string and wellbore drag reduction overcomes the limitations of conventional friction-reducing torque technologies, representing an important development direction for theoretical research and tool development in high-friction well drilling. Laboratory test results show that among axial, torsional, and lateral vibration modes, axial vibration has a greater drag reduction effect than torsional vibration, which in turn has a greater effect than lateral vibration.

[0005] Extensive research has been conducted both domestically and internationally on percussion drilling technology, resulting in the development of various percussion drilling tools. Field applications have demonstrated that percussion drilling tools are highly reliable and offer significant speed-up effects. The use of torsional or rotary percussion drilling tools can significantly improve the drilling speed in difficult-to-drill formations. Consequently, research on percussion drilling tools has become a hot topic in recent years, leading to the development of various hydraulically or mechanically driven torsional and axial percussion drilling tools.

[0006] While existing single-dimensional impact drilling tools can provide axial or torsional impact force to the drill bit to some extent and achieve a certain speed increase, their application effect is not ideal. They suffer from the following technical problems: torsional impact tools provide low impact force, requiring pairing with highly aggressive drill bits to achieve speed and efficiency gains; axial impact tools cause torsional vibration of the drill bit, leading to the risk of tooth breakage, and some axial impact tools have low impact force, failing to achieve the goal of cost reduction and efficiency improvement; existing impact tools have complex structures due to their mechanical impact structure design and sealing rings, and these structures are easily damaged, resulting in short tool life and difficult maintenance; and their use in oil drilling processes suffers from low conversion efficiency, complex structure, and high energy consumption. Summary of the Invention

[0007] This invention provides a torsional impact assembly and a variable frequency shaft-torsion coupling impact drilling speed-up tool, which overcomes the shortcomings of the prior art and can effectively solve the problems of existing torsional impact tools having small impact force, complex structure and easy damage.

[0008] One of the technical solutions of this invention is achieved through the following measures: a torsional impact assembly, comprising a drill rod, a housing, a torsional impact shell, and a torsional impact hammer. The outer housing is fitted onto the outside of the drill rod, and a torsional turntable fitted onto the outside of the drill rod is fixedly installed on the inner side of the housing. A torsional impact shell fitted into the housing is fixedly installed on the outside of the drill rod corresponding to the position below the torsional turntable. Several mounting cavities are distributed circumferentially within the torsional impact shell. A vertically penetrating track groove is provided on the upper side of the impact shell corresponding to each mounting cavity. A push rod is slidably installed in each track groove. When the push rod slides relative to the track groove, it interacts with the drill rod. The center distance between the push rods increases first and then remains constant, or increases first and then decreases. Each push rod has a torsional impact hammer fixedly installed at its lower end and slidably installed in the mounting cavity. A first elastic reset element is provided between the torsional impact hammer and the inner wall of the mounting cavity. A cam block is fixedly installed on the lower side of the torsional turntable corresponding to each push rod position. When the center distance between the push rod and the drill rod increases, it contacts the cam block and the first elastic reset element is compressed. When the center distance between the push rod and the drill rod decreases or remains constant, it separates from the cam block and the first elastic reset element resets. After the first elastic reset element resets, the torsional impact hammer strikes the torsional impact shell and then acts on the drill rod.

[0009] The following are further optimizations and / or improvements to one of the above-mentioned inventive technical solutions: The aforementioned torsional impact shell may include a torsional impact cylinder and a rotating disk. The torsional impact cylinder is an annular cylinder with an open lower end and a closed upper end. The inner wall of the torsional impact cylinder and the drill pipe are fixedly installed together. The lower end of the torsional impact cylinder is fixedly installed together with the upper end of the rotating disk. Two track grooves are evenly distributed along the circumference on the upper side of the torsional impact cylinder. The track grooves include a compression section and a reset section that are interconnected. Both the compression section and the reset section are curved. A cam ring is fixedly installed on the lower side of the torsional rotating disk. A crescent-shaped cam block is fixed on the outer side of the cam ring corresponding to the position of the compression section. The lower outer side of the push rod is located inside the compression section. The first elastic reset element includes a compression spring disposed between the torsional impact hammer and the corresponding reset section. The cam block has a limiting surface and a separation surface. The limiting surface is curved. The limiting surface abuts against the upper outer side of the push rod. When the torsional impact cylinder rotates, the push rod moves away from the drill pipe's central axis when it moves from the compression section to the reset section. When the push rod moves into the reset section, it separates from the limiting surface, and the torsional impact hammer strikes the torsional impact cylinder under the action of the compression spring.

[0010] The separation surface can be an arc surface or an inclined surface. There is a circular arc transition between the separation surface and the limiting surface, and a smooth transition between the separation surface and the outer side of the cam ring. The compression section is an arc shape concentric with the torsional impact cylinder.

[0011] The aforementioned outer casing may include a cylinder, an upper cover, and a lower cover. The outer side of the upper cover is fixedly installed together with the inner side of the upper part of the cylinder, and the inner side of the upper cover is rotatably and sealingly installed together with the outer side of the upper part of the drill rod. The outer side of the lower cover is fixedly installed together with the inner side of the lower part of the cylinder, and the inner side of the lower cover is rotatably and sealingly installed together with the outer side of the lower part of the drill rod. The inner side of the middle part of the cylinder is fixedly installed together with the outer side of the torsion turntable.

[0012] The second technical solution of the present invention is achieved through the following measures: a variable frequency shaft-torsion coupling impact drilling speed-up tool, comprising a torsional impact assembly, a low-frequency shaft impact assembly, and a high-frequency shaft impact assembly. The low-frequency shaft impact assembly is installed between the outer side of the drill rod and the inner side of the housing corresponding to the position above the torsional rotary table, and the high-frequency shaft impact assembly is installed between the outer side of the drill rod and the inner side of the housing corresponding to the position below the torsional impact housing. When the rotational speed of the drill rod is less than the set rotational speed, the low-frequency shaft impact assembly transmits low-frequency axial impact to the drill rod. When the rotational speed of the drill rod is greater than or equal to the set rotational speed, the high-frequency shaft impact assembly transmits high-frequency axial impact to the drill rod.

[0013] The following are further optimizations and / or improvements to the second technical solution of the above invention: The aforementioned low-frequency shaft punch assembly may include a low-frequency punching plate, a low-frequency rotating wheel, a low-frequency connecting shaft, a low-frequency punch hammer, and an upper clutch. The low-frequency punching plate and the low-frequency rotating wheel are fixedly installed at intervals from bottom to top on the outer side of the drill rod corresponding to the position above the rotary table. A hollow low-frequency connecting shaft is fitted on the outer side of the drill rod corresponding to the position above the low-frequency rotating wheel. An upper clutch is provided between the lower part of the low-frequency connecting shaft and the low-frequency rotating wheel. When the drill rod speed is less than the set speed, the low-frequency connecting shaft and the low-frequency rotating wheel rotate synchronously. When the drill rod speed is greater than or equal to the set speed, the low-frequency connecting shaft and the low-frequency rotating wheel rotate relative to each other. A tubular low-frequency hammer is fitted between the outer side of the low-frequency connecting shaft and the inner side of the upper part of the cylinder. Several upper ratchet teeth are evenly distributed along the circumference of the inner side of the upper part of the low-frequency hammer. A low-frequency rotating sleeve is fixedly installed on the outer side of the upper part of the low-frequency connecting shaft. At least one lower ratchet tooth is fixed to the upper end of the low-frequency rotating sleeve, meshing with the upper ratchet teeth. Both the upper and lower ratchet teeth are V-shaped with their openings facing downwards. The first surface of both the upper and lower ratchet teeth is vertical, while the second surface of both is inclined. A second elastic element is provided between the upper end of the low-frequency hammer and the lower end of the upper cover. The reset component has at least two upper limit blocks evenly distributed along the circumference of the outer side of the low-frequency hammer. Each upper limit block has an upper limit plate fixedly installed on both sides of the inner side of the upper part of the cylinder. When the first lower ratchet rotates with the low-frequency rotating sleeve, the second surface of the first upper ratchet first rotates upward along the second surface of the first lower ratchet, which compresses the second elastic reset component. When the lower side of the first upper ratchet is above the first lower ratchet, the second elastic reset component resets, which causes the first surface of the first upper ratchet to move downward along the first surface of the first lower ratchet to the initial position. After the lower end of the low-frequency hammer moves downward, it impacts the upper end of the low-frequency impact plate.

[0014] The aforementioned upper clutch may include two upper clutch assemblies evenly spaced along the circumference. Each upper clutch assembly includes an upper ratchet, an upper pawl, an upper hinge shaft, an inner connecting rod, an outer connecting rod, and a third elastic reset member. The upper ratchet is fixedly installed on the lower outer side of the low-frequency connecting shaft. The upper hinge shaft and the inner connecting rod are fixedly installed at intervals on the upper end of the low-frequency rotating wheel. The distance between the upper hinge shaft and the drill pipe center axis is greater than the distance between the inner connecting rod and the drill pipe center axis. The upper pawl is hingedly installed on the upper part of the upper hinge shaft. The outer connecting rod is fixedly installed on the lower side of the upper pawl. The third elastic reset member is installed between the inner connecting rod and the outer connecting rod. The upper pawl engages with the upper ratchet when the drill pipe speed is less than the set speed, and disengages from the upper ratchet when the drill pipe speed is greater than or equal to the set speed. The lower end of the upper cover is provided with a first limiting ring groove with an opening facing downwards. The upper end of the low-frequency hammer corresponding to the position of the first limiting ring groove is provided with a second limiting ring groove with an opening facing upwards. The upper part of the second elastic reset member is located in the first limiting ring groove, and the lower part of the second elastic reset member is located in the second limiting ring groove.

[0015] The aforementioned high-frequency shaft punch assembly may include a high-frequency punching plate, a high-frequency rotating wheel, a high-frequency connecting shaft, a high-frequency punch hammer, and a lower clutch. A high-frequency rotating wheel is fixedly installed on the outside of the drill rod corresponding to the position below the rotating disk. A hollow high-frequency connecting shaft is provided below the high-frequency rotating wheel and fitted onto the outside of the drill rod. A lower clutch is provided between the upper end of the high-frequency connecting shaft and the lower end of the high-frequency rotating wheel. When the drill rod speed is greater than or equal to the set speed, the high-frequency connecting shaft and the high-frequency rotating wheel rotate synchronously. When the drill rod speed is less than the set speed, the high-frequency connecting shaft and the high-frequency rotating wheel rotate relative to each other. A tubular high-frequency impact hammer is fitted on the outer side of the lower part of the high-frequency connecting shaft. A high-frequency impact plate is fixedly installed on the outer side of the lower part of the drill rod corresponding to the lower end of the high-frequency impact hammer. A limiting ring plate fitted on the inner side of the upper part of the high-frequency impact hammer is fixedly installed on the outer side of the drill rod corresponding to the lower end of the high-frequency connecting shaft. An inner ring platform is fixed on the inner side of the lower part of the high-frequency impact hammer corresponding to the position below the limiting ring plate. A fourth elastic reset member is provided between the lower end of the limiting ring plate and the upper end of the inner ring platform. Several second upper ratchet teeth are evenly distributed along the circumference of the upper inner side of the high-frequency hammer. A high-frequency rotating sleeve is fixedly installed on the lower outer side of the high-frequency connecting shaft. At least one second lower ratchet tooth is fixed at the upper end of the high-frequency rotating sleeve, which meshes with the second upper ratchet teeth. Both the second upper and lower ratchet teeth are V-shaped with their openings facing downwards. The first surfaces of the second and lower ratchet teeth are both vertical surfaces, and the second surfaces of the second and lower ratchet teeth are both inclined surfaces. At least two lower limit blocks are evenly distributed along the circumference of the outer side of the high-frequency hammer. Each lower limit block has a lower limit plate fixedly installed on both sides of the lower inner side of the cylinder. When the second lower ratchet tooth rotates with the high-frequency rotating sleeve, the second surface of the second upper ratchet tooth first rotates upwards along the second surface of the second lower ratchet tooth, which compresses the fourth elastic reset member. When the lower side of the second upper ratchet tooth is above the second lower ratchet tooth, the fourth elastic reset member resets, which causes the first surface of the second upper ratchet tooth to move downwards along the first surface of the second lower ratchet tooth to the initial position. After the lower end of the high-frequency hammer moves downwards, it impacts the upper end of the high-frequency impact plate.

[0016] The aforementioned lower clutch may include two lower clutch assemblies evenly spaced along the circumference. Each lower clutch assembly includes a retaining ring, a lower pawl, a lower hinge shaft, an inner connecting post, an outer connecting post, and a fifth elastic reset component. A retaining ring is fixedly installed at the upper end of the high-frequency rotating shaft, and several retaining grooves are evenly distributed along the circumference of the retaining ring. The lower hinge shaft and the inner connecting post are fixedly installed at intervals at the lower end of the high-frequency rotating wheel. The distance between the lower hinge shaft and the drill pipe center axis is greater than the distance between the inner connecting post and the drill pipe center axis. A lower pawl is hingedly installed at the lower part of the lower hinge shaft, and an outer connecting post is fixedly installed on the upper side of the lower pawl. The fifth elastic reset component is installed between the inner connecting post and the outer connecting post. The lower pawl separates from the retaining ring when the drill pipe speed is less than the set speed, and the upper pawl engages with the retaining ring when the drill pipe speed is greater than or equal to the set speed.

[0017] Positioning rings can be fixedly installed at both ends of the high-frequency rotor and both ends of the low-frequency rotor. Several bearings are provided at intervals between the inner side of the high-frequency connecting shaft, the inner side of the low-frequency connecting shaft and the outer side of the drill rod.

[0018] The present invention has a reasonable and compact structure. In use, the torsional impact assembly is installed near the drill bit of the screw drill. The outer shell is fixed to the outer shell of the screw drill. The upper part of the drill rod is connected to the drill collar, and the lower part of the drill rod is connected to the drill bit. The torsional turntable is fixed by the outer shell and does not move. The cam block is also fixed. The push rod abuts against the cam block at the corresponding position under the action of the first elastic reset member.

[0019] When the screw drill bit is running, the screw drill bit housing and the torsional impact assembly housing remain stationary. The drill collar drives the drill rod to rotate, and the rotation of the drill rod drives the torsional impact housing to rotate. The push rod, blocked by the cam block, will not move forward, and the torsional impact hammer will also not move forward. After the torsional impact housing rotates, it presses against the first elastic reset member. The first elastic reset member, through the torsional impact hammer, continues to cause the push rod to abut against the cam block. At the same time, as the track groove rotates with the torsional impact housing, the center distance between the push rod and the drill rod when the push rod slides relative to the track groove first increases and then remains unchanged, or first increases and then decreases. That is, the push rod gradually moves outward under the constraint of the track groove. When the push rod moves outward to the farthest point, that is, when the push rod and the cam block are at their farthest point, the center distance between the push rod and the drill rod is at its farthest point. When the center distance between drill rods is at its maximum, the distance between the inner wall of the track groove and the central axis of the drill rod is also at its maximum. The distance between the farthest end of the cam block and the central axis of the drill rod is less than the maximum center distance between the push rod and the drill rod. The push rod is no longer blocked by the cam block. At this time, the first elastic reset member begins to extend and reset, pushing the torsional impact hammer to the initial position and impacting the torsional impact shell. Since the torsional impact shell is fixedly installed with the drill rod, the impact force of the torsional impact hammer on the torsional impact shell forms a torsional impact on the drill rod, thereby transmitting the torsional impact to the drill bit through the drill rod. At this time, the push rod also moves to the initial position with the torsional impact hammer and abuts against the side of the next cam block.

[0020] After the push rod periodically abuts against the cam block, it moves along the surface of the cam block in a direction away from the outside of the drill pipe. The first elastic reset element is squeezed and eventually separates from the cam block. After the first elastic reset element resets, it pushes the torsional impact hammer to strike the torsional impact shell, thereby transmitting torsional impact to the drill pipe and drill bit. After the push rod resets, it abuts against the cam block again. This process repeats. After the first elastic reset element is squeezed, it accumulates energy and releases the energy after the push rod is released. This energy acts on the torsional impact hammer to the torsional impact shell. The torsional impact hammer to the torsional impact shell is transmitted to the drill pipe, and the drill pipe further transmits the force to the drill bit. The tool transmits periodic torque and axial impact to the drill bit, which accelerates the rock breaking speed of the drill bit, reduces the drilling cycle, and thus saves costs and time. Attached Figure Description

[0021] Appendix Figure 1These are schematic diagrams of the main cross-sectional structure of embodiments one to four of the present invention.

[0022] Appendix Figure 2 This is a top cross-sectional view of the cam ring structure in embodiments two to four of the present invention.

[0023] Appendix Figure 3 This is a bottom-view cross-sectional structural diagram of the outer shell in embodiments two to four of the present invention.

[0024] Appendix Figure 4 This is a top view of the torsional impact shell in embodiments two to four of the present invention.

[0025] Appendix Figure 5 This is a bottom cross-sectional view of the torsional impact shell in embodiments two to four of the present invention.

[0026] Appendix Figure 6 This is a top sectional view of the push rod in the compression section when it is initially positioned in Embodiments 2 to 4 of the present invention.

[0027] Appendix Figure 7 This is a top sectional view of the push rod after it has been reset, located within the reset section, in embodiments two to four of the present invention.

[0028] Appendix Figure 8 This is a three-dimensional structural diagram of the torsion turntable in embodiments two to four of the present invention.

[0029] Appendix Figure 9 These are schematic diagrams of the main cross-sectional structure of embodiments five to ten of the present invention.

[0030] Appendix Figure 10 These are schematic diagrams of the three-dimensional structure after removing the cylinder, low-frequency impact hammer, and high-frequency impact hammer in embodiments five to ten of the present invention.

[0031] Appendix Figure 11 This is a schematic diagram of the front cross-sectional structure of the low-frequency impact hammer in embodiments five to seven of the present invention.

[0032] Appendix Figure 12 This is a top-view cross-sectional structural diagram of the low-frequency impact hammer in embodiments five to seven of the present invention.

[0033] Appendix Figure 13 This is a top cross-sectional view of the upper clutch in Embodiment 7 of the present invention.

[0034] Appendix Figure 14 This is a schematic diagram of the front cross-sectional structure of the high-frequency impact hammer in embodiments eight to ten of the present invention.

[0035] Appendix Figure 15 This is a top sectional view of the high-frequency connecting shaft in embodiments eight to ten of the present invention.

[0036] Appendix Figure 16This is a top sectional view of the lower clutch in embodiments nine and ten of the present invention.

[0037] Appendix Figure 17 This is a schematic diagram of the main cross-sectional structure of the cylinder in embodiments eight to ten of the present invention.

[0038] The codes in the attached diagram are as follows: 1 is drill pipe, 2 is connecting ring platform, 3 is torsional impact hammer, 4 is torsional turntable, 5 is mounting cavity, 6 is push rod, 7 is first elastic reset element, 8 is cam block, 9 is torsional impact cylinder, 10 is rotating disk, 11 is compression section, 12 is reset section, 13 is cam ring, 14 is limiting surface, 15 is separation surface, 16 is cylinder body, 17 is upper cover, 18 is lower cover, 19 is low-frequency impact plate, 20 is low-frequency wheel, 21 is low-frequency connecting shaft, 22 is low-frequency impact hammer, 23 is first upper ratchet, 24 is low-frequency rotating sleeve, 25 is first lower ratchet, 26 is second elastic reset element, 27 is upper limit block, 28 is upper limit plate, 29 is upper ratchet, 30 is... 31 is the upper ratchet, 32 is the upper hinge shaft, 33 is the inner connecting rod, 34 is the outer connecting rod, 35 is the third elastic reset component, 36 is the first limiting ring groove, 37 is the second limiting ring groove, 38 is the high-frequency impact plate, 39 is the high-frequency connecting shaft, 40 is the high-frequency impact hammer, 41 is the limiting ring plate, 42 is the inner ring platform, 43 is the fourth elastic reset component, 44 is the second upper ratchet, 45 is the high-frequency rotating sleeve, 46 is the second lower ratchet, 47 is the lower limiting block, 48 is the lower limiting plate, 49 is the retaining ring, 50 is the lower ratchet, 51 is the lower hinge shaft, 52 is the inner connecting post, 53 is the outer connecting post, 54 is the fifth elastic reset component, 55 is the retaining groove, 56 is the positioning ring, and 57 is the bearing. Detailed Implementation

[0039] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0040] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as the positional relationships of front, back, top, bottom, left, and right, which are based on the instructions attached. Figure 1 The orientation of the layout is determined by the direction of the map.

[0041] The present invention will be further described below with reference to embodiments and accompanying drawings: Example 1: As shown in the attached document Figure 1As shown, the torsional impact assembly includes a drill rod 1, a housing, a torsional impact shell, and a torsional impact hammer 3. The outer housing is fitted onto the outside of the drill rod 1, and a torsional turntable 4 fitted onto the outside of the drill rod 1 is fixedly installed on the inner side of the housing. A torsional impact shell fitted into the housing is fixedly installed on the outside of the drill rod 1 at a position below the torsional turntable 4. Several mounting cavities 5 are distributed circumferentially within the torsional impact shell. A vertically penetrating track groove is provided on the upper side of the impact shell corresponding to each mounting cavity 5. A push rod 6 is slidably installed in each track groove. When the push rod 6 slides relative to the track groove, the center distance between it and the drill rod 1 first increases and then remains constant, or first... After increasing, the size decreases. Each push rod 6 has a torsional impact hammer 3 fixedly installed at its lower end and slidably installed in the mounting cavity 5. A first elastic reset member 7 is provided between the torsional impact hammer 3 and the inner wall of the mounting cavity 5. A cam block 8 is fixedly installed on the lower side of the torsional turntable 4 corresponding to the position of each push rod 6. When the center distance between the push rod 6 and the drill rod 1 increases, it contacts the cam block 8 and the first elastic reset member 7 is compressed. When the center distance between the push rod 6 and the drill rod 1 decreases or remains unchanged, it separates from the cam block 8 and the first elastic reset member 7 resets. After the first elastic reset member 7 resets, the torsional impact hammer 3 strikes the torsional impact shell and then acts on the drill rod 1.

[0042] Depending on the requirements, the first elastic reset element 7 is a known prior art, such as a cylindrical compression spring, and the track groove can be crescent-shaped or an arc with an inward opening.

[0043] In use, the torsional impact assembly is installed near the drill bit of the screw drill bit, the outer shell is fixed to the outer shell of the screw drill bit, the upper part of the drill rod 1 is connected to the drill collar, the lower part of the drill rod 1 is connected to the drill bit, the torsional turntable 4 is fixed by the outer shell and does not move, the cam block 8 is also fixed, and the push rod 6 abuts against the cam block 8 at the corresponding position under the action of the first elastic reset member 7.

[0044] When the screw drill is running, the screw drill housing and the torsional impact assembly housing remain stationary. The drill collar drives the drill rod 1 to rotate. As the drill rod 1 rotates, it drives the torsional impact housing to rotate. The push rod 6 is blocked by the cam block 8 and will not move forward. The torsional impact hammer 3 will also move forward. After the torsional impact housing rotates, it squeezes the first elastic reset member 7. The first elastic reset member 7 continues to make the push rod 6 abut against the cam block 8 through the torsional impact hammer 3. At the same time, as the track groove rotates with the torsional impact housing, the center distance between the push rod 6 and the drill rod 1 when sliding relative to the track groove first increases and then remains unchanged, or first increases and then decreases. That is, the push rod 6 gradually moves outward under the constraint of the track groove. When the push rod 6 moves outward to the farthest end, that is, when the push rod 6 and the drill rod 1 are at their farthest point, the center distance between the push rod 6 and the drill rod 1 is first increased and then remains unchanged, or first increased and then decreased. That is, the push rod 6 gradually moves outward under the constraint of the track groove. When the center distance between rods 1 is at its maximum, the distance between the inner wall of the track groove and the central axis of drill rod 1 is at its maximum. The distance between the farthest end of cam block 8 and the central axis of drill rod 1 is less than the maximum center distance between push rod 6 and drill rod 1. Push rod 6 is no longer blocked by cam block 8. At this time, the first elastic reset member 7 begins to extend and reset, pushing the torsional impact hammer 3 to the initial position and impacting the torsional impact shell. Since the torsional impact shell is fixedly installed with drill rod 1, the impact force of torsional impact hammer 3 on torsional impact shell forms a torsional impact on drill rod 1, thereby transmitting the torsional impact to the drill bit through drill rod 1. At this time, push rod 6 also moves to the initial position with torsional impact hammer 3 and abuts against the side of the next cam block 8.

[0045] After periodically abutting against the cam block 8, the push rod 6 moves along the surface of the cam block 8 in a direction away from the outside of the drill rod 1. The first elastic reset member 7 is squeezed and eventually separates from the cam block 8. After the first elastic reset member 7 resets, it pushes the torsional impact hammer 3 to strike the torsional impact shell, thereby transmitting torsional impact to the drill rod 1 and the drill bit. After the push rod 6 resets, it abuts against the cam block 8 again. This process is repeated. After the first elastic reset member 7 is squeezed, it accumulates energy and releases the energy after the push rod 6 is released from its obstruction. This energy acts on the torsional impact hammer 3 to the torsional impact shell. The torsional impact hammer 3 to the torsional impact shell is transmitted to the drill rod 1. The drill rod 1 further transmits the force to the drill bit. The torsional impact assembly transmits the periodic torque impact to the drill bit, which accelerates the rock breaking speed of the drill bit, reduces the drilling cycle, and thus saves costs and time.

[0046] The above-mentioned torsional impact components can be further optimized and / or improved according to actual needs: Example 2: As an optimization of the above examples, as shown in the appendix. Figures 1 to 8As shown, the torsional impact housing includes a torsional impact cylinder 9 and a rotating disk 10. The torsional impact cylinder 9 is an annular cylinder with an open lower end and a closed upper end. The inner wall of the torsional impact cylinder 9 is fixedly installed with the drill rod 1. The lower end of the torsional impact cylinder 9 is fixedly installed with the upper end of the rotating disk 10. Two track grooves are evenly distributed along the circumference on the upper side of the torsional impact cylinder 9. The track grooves include a compression section 11 and a reset section 12 that are interconnected. Both the compression section 11 and the reset section 12 are curved. A cam ring 13 is fixedly installed on the lower side of the torsional rotating disk 4. A crescent-shaped... The cam block 8 and the lower outer side of the push rod 6 are located inside the compression section 11. The first elastic reset member 7 includes a compression spring disposed between the torsional impact hammer 3 and the corresponding reset section 12. The cam block 8 has a limiting surface 14 and a separation surface 15. The limiting surface 14 is a curved surface. The limiting surface 14 abuts against the upper outer side of the push rod 6. When the torsional impact cylinder 9 rotates, the push rod 6 moves away from the central axis of the drill rod 1 when it moves from the compression section 11 to the reset section 12. When the push rod 6 moves into the reset section 12, it separates from the limiting surface 14. The torsional impact hammer 3 strikes the torsional impact cylinder 9 under the action of the compression spring.

[0047] According to the requirements, the torsional impact cylinder 9 is an annular cylinder with an open bottom and a closed top. That is, the torsional impact cylinder 9 has an annular mounting groove with the opening facing downward. Two partitions are evenly distributed around the circumference of the mounting groove. The partitions, the inner side of the torsional impact cylinder 9, and the upper side of the rotating disk 10 form two mounting cavities 5. A connecting ring platform 2 is fixed inside the outer shell. The outer side of the torsional rotating disk 4 is screwed to the connecting ring platform 2. Two bearings are arranged vertically between the inner side of the torsional rotating disk 4 and the outer side of the drill rod 1. The inner side of the torsional impact cylinder 9 is fixed to the outer side of the drill rod 1. The inner side of the lower end of the torsional impact cylinder 9 is screwed to the outer side of the rotating disk 10. This facilitates the installation of the torsional impact hammer 3 and the first elastic reset member 7. The first elastic reset member 7 also includes two mounting posts. One mounting post is fixed inside the torsional impact cylinder 9 (side of the partition), and the other mounting post is fixed to the side of the torsional impact hammer 3. The two ends of the compression spring are respectively fitted on the outer sides of the two mounting posts. This can prevent the compression spring from shifting during operation.

[0048] In this embodiment, the compression section 11 is an arc concentric with the drill rod 1. The compression section 11 and the reset section 12 can also be arcs with openings opposite each other. When the push rod 6 moves from the compression section 11 to the reset section 12 in the track groove, the center distance between the push rod 6 and the drill rod 1 first increases and then remains unchanged. The limiting surface 14 and the separation surface 15 of the cam block 8 form a crescent shape. In this way, when the push rod 6 moves outward along the limiting surface 14 to the farthest position, the cam block 8 no longer blocks the push rod 6. In order to avoid the separation surface 15 and the push rod 6 from contacting each other and affecting the moving speed of the push rod 6, the outline of the separation surface 15 is located in the area between the outer side of the cam ring 13, the limiting surface 14, the farthest end of the cam block 8 and the central axis of the drill rod 1. In order to facilitate the processing of the separation surface 15, the separation surface 15 is an inclined surface.

[0049] Initially, the limiting surface 14 abuts against the push rod 6. When the screw drill bit is running, the screw drill bit housing and the housing of the torsional impact assembly remain stationary. The drill collar drives the drill rod 1 to rotate. When the drill rod 1 rotates, it drives the torsional impact housing to rotate. The push rod 6 is blocked by the cam block 8 and will not move forward. The torsional impact hammer 3 also does not move forward. After the torsional impact housing rotates, the compression spring is compressed. The compression spring continues to cause the push rod 6 to abut against the cam block 8 through the torsional impact hammer 3. At the same time, as the track groove rotates with the torsional impact housing, the center distance between the push rod 6 and the drill rod 1 gradually increases when the push rod 6 slides in the compression section 11. When the push rod 6 moves outward to the farthest end, that is, when the push rod 6 enters the reset section 12 from the compression section 11, the farthest end of the cam block 8 and the... The distance between the central axes of drill rod 1 is less than the maximum center distance between push rod 6 and drill rod 1. Push rod 6 is no longer blocked by cam block 8. At this time, the first elastic reset member 7 begins to extend and reset, pushing the torsional impact hammer 3 to the initial position and impacting the torsional impact cylinder 9. Since the torsional impact cylinder 9 is fixedly installed with drill rod 1, the impact force of torsional impact hammer 3 on torsional impact cylinder 9 forms a torsional impact on drill rod 1, thereby transmitting the torsional impact to the drill bit through drill rod 1. At this time, push rod 6 also moves to the initial position with torsional impact hammer 3 and abuts against the limiting surface 14 of the next cam block 8. This process repeats. As drill rod 1 continues to rotate, torsional impact hammer 3 periodically forms a torsional impact on drill rod 1.

[0050] Example 3: As an optimization of the above examples, as shown in the appendix. Figures 2 to 8 As shown, the separation surface 15 is an arc surface or an inclined surface, the separation surface 15 and the limiting surface 14 are connected by an arc, the separation surface 15 and the outer side of the cam ring 13 are connected by a smooth transition, and the compression section 11 is an arc shape concentric with the torsional impact cylinder 9.

[0051] The separation surface 15 is an arc surface, an inclined surface, or an involute spiral surface. In order to reduce the impact force when the push rod 6 contacts the separation surface 15 and to reduce the processing difficulty of the separation surface 15, the separation surface 15 in this embodiment is an arc surface. The reset section 12 is arc-shaped. From the end of the reset section 12 that connects to the compression section 11 to the other end of the reset section 12, the distance between the inner wall of the reset section 12 and the central axis of the drill rod 1 gradually decreases.

[0052] Example 4: As an optimization of the above examples, as shown in the appendix. Figure 1 As shown, the outer casing includes a cylinder 16, an upper cover 17, and a lower cover 18. The outer side of the upper cover 17 is fixedly installed with the upper inner side of the cylinder 16, and the inner side of the upper cover 17 is rotatably and sealingly installed with the upper outer side of the drill rod 1. The outer side of the lower cover 18 is fixedly installed with the lower inner side of the cylinder 16, and the inner side of the lower cover 18 is rotatably and sealingly installed with the lower outer side of the drill rod 1. The inner side of the middle part of the cylinder 16 is fixedly installed with the outer side of the torsion turntable 4.

[0053] To facilitate the assembly and disassembly of the cylinder 16 and the rotary table 4, the cylinder 16 can be divided into two sections. Sealing rings are installed between the inner side of the upper cover 17 and the outer side of the upper part of the drill pipe 1, and between the inner side of the lower cover 18 and the outer side of the lower part of the drill pipe 1. This improves the sealing performance of the cylinder 16, protects the parts inside the cylinder 16, and reduces the failure rate during downhole operations.

[0054] Example 5: As attached Figure 9 As shown, the variable frequency shaft-torsion coupling impact drilling speed-up tool includes a torsional impact assembly, a low-frequency shaft impact assembly, and a high-frequency shaft impact assembly. The low-frequency shaft impact assembly is installed between the outer side of the drill pipe 1 and the inner side of the housing, corresponding to the position above the torsional rotary table 4. The high-frequency shaft impact assembly is installed between the outer side of the drill pipe 1 and the inner side of the housing, corresponding to the position below the torsional impact housing. When the rotational speed of the drill pipe 1 is less than the set rotational speed, the low-frequency shaft impact assembly transmits low-frequency axial impact to the drill pipe 1. When the rotational speed of the drill pipe 1 is greater than or equal to the set rotational speed, the high-frequency shaft impact assembly transmits high-frequency axial impact to the drill pipe 1.

[0055] The variable frequency shaft-torsion coupling impact drilling speed-up tool can switch its working state according to the drill pipe speed and the drilling difficulty of the formation. When the formation is difficult to drill, the tool will be in low frequency shaft-impact mode, applying a low-frequency but strong shaft-impact force to the drill bit; when the formation is easy to drill, the tool will be in high frequency shaft-impact mode, the drill bit rotation frequency will be increased, and a high-frequency but weak axial impact force will be applied to the drill bit.

[0056] The above-mentioned variable frequency shaft-torsion coupling impact drilling speed-up tool can be further optimized and / or improved according to actual needs: Example 6: As an optimization of the above examples, as shown in the appendix Figures 9 to 12 As shown in Figure 17, the low-frequency shaft punch assembly includes a low-frequency punching plate 19, a low-frequency rotating wheel 20, a low-frequency connecting shaft 21, a low-frequency punch 22, and an upper clutch. The low-frequency punching plate 19 and the low-frequency rotating wheel 20 are fixedly installed on the outer side of the drill rod 1, which is located above the rotary table 4, from bottom to top. A hollow low-frequency connecting shaft 21 is fitted on the outer side of the drill rod 1, which is located above the low-frequency rotating wheel 20. An upper clutch is provided between the lower part of the low-frequency connecting shaft 21 and the low-frequency rotating wheel 20. When the rotation speed of the drill rod 1 is less than the set rotation speed, the low-frequency connecting shaft 21 and the low-frequency rotating wheel 20 rotate synchronously. When the rotation speed of the drill rod 1 is greater than or equal to the set rotation speed, the low-frequency connecting shaft 21 and the low-frequency rotating wheel 20 rotate relative to each other.

[0057] A tubular low-frequency hammer 22 is fitted between the outer side of the low-frequency connecting shaft 21 and the inner side of the upper part of the cylinder 16. Several first upper ratchet teeth 23 are evenly distributed along the circumference of the inner side of the upper part of the low-frequency hammer 22. A low-frequency rotating sleeve 24 is fixedly installed on the outer side of the upper part of the low-frequency connecting shaft 21. At least one first lower ratchet tooth 25, which meshes with the first upper ratchet teeth 23, is fixed at the upper end of the low-frequency rotating sleeve 24. Both the first upper ratchet teeth 23 and the first lower ratchet teeth 25 are V-shaped with their openings facing downwards. The first surface of the first upper ratchet tooth 23 and the first surface of the first lower ratchet tooth 25 are vertical surfaces, while the second surface of the first upper ratchet tooth 23 and the second surface of the first lower ratchet tooth 25 are inclined surfaces. A second elastic element is provided between the upper end of the low-frequency hammer 22 and the lower end of the upper cover 17. The reset component 26 and the low-frequency hammer 22 are evenly distributed with at least two upper limit blocks 27 on the outer side of the circumference. Each upper limit block 27 has an upper limit plate 28 fixedly installed on the inner side of the upper part of the cylinder 16 on both sides. When the first lower ratchet 25 rotates with the low-frequency rotating sleeve 24, the second surface of the first upper ratchet 23 first rotates upward along the second surface of the first lower ratchet 25, which compresses the second elastic reset component 26. When the lower side of the first upper ratchet 23 is above the first lower ratchet 25, the second elastic reset component 26 resets, which causes the first surface of the first upper ratchet 23 to move downward along the first surface of the first lower ratchet 25 to the initial position. After the lower end of the low-frequency hammer 22 moves downward, it impacts the upper end of the low-frequency impact plate 19.

[0058] According to requirements, the second elastic reset member 26 is a known compression spring. A key is provided between the low-frequency rotor 20 and the drill rod 1 to ensure torque transmission. The upper clutch is a known overspeed clutch. The overspeed clutch engages when the speed of the driven shaft is lower than that of the driven shaft, causing both shafts to rotate together. When the speed exceeds that of the driven shaft, it disengages the two shafts. Specifically, it can be a speed limiter (elevator). The first upper ratchet 23 and the first lower ratchet 25 correspond one-to-one. When the lower side of the first upper ratchet 23 is above the first lower ratchet 25, the second elastic reset member 26 resets. The first surface of the first upper ratchet 23 moves downward along the first surface of the first lower ratchet 25 to the initial position. After the lower end of the low-frequency hammer 22 moves downward, it impacts the upper end of the low-frequency impact plate 19. That is, when the tip of the first upper ratchet 23 is above the tip of the first lower ratchet 25, the second elastic reset member 26 resets, causing the first surface of the first upper ratchet 23 to move downward along the first surface of the first lower ratchet 25 to the initial position. That is, when the second elastic reset member 26 resets, the lower end of the low-frequency hammer 22 moves downward and impacts the upper end of the low-frequency impact plate 19. The first lower ratchet 25 can also be a right-angled trapezoid that is narrower at the top and wider at the bottom.

[0059] Three upper limit blocks 27 are evenly distributed around the outer side of the low-frequency hammer 22. Each upper limit block 27 has an upper limit plate 28 fixedly installed on the inner side of the upper part of the cylinder 16 on both sides. The two upper limit plates 28 form an upper limit groove. The width of the upper limit groove matches the thickness of the upper limit block 27, so that the upper limit block 27 can only move up and down between the two upper limit plates 28.

[0060] The variable frequency shaft-torsion coupling impact drilling speed-up tool is connected to the screw drill bit. The screw drill bit housing is stationary, while the internal drill rod 1 rotates. The housing is connected to the screw drill bit housing, and the internal drill rod 1 is connected to the screw drill bit 1. The lower part of the drill rod 1 is connected to the drill bit. In the initial state, the first upper ratchet 23 and the first lower ratchet 25 are engaged with each other.

[0061] When the screw drill rotates, the outer casing remains stationary, the drill rod 1 rotates, and the low-frequency rotary wheel 20 rotates with the drill rod 1. When the drill rod 1 rotates at high speed (greater than or equal to the set speed), the upper clutch is activated, and the low-frequency connecting shaft 21 rotates relative to the low-frequency rotary wheel 20. That is, the low-frequency connecting shaft 21 is stationary relative to the outer cylinder 16, and the low-frequency rotary wheel 20 rotates at low speed with the drill rod 1.

[0062] When drill rod 1 rotates at low speed (less than the set speed), the upper clutch does not engage. The low-frequency connecting shaft 21 and the low-frequency rotating wheel 20 rotate synchronously after being connected. The rotation of the low-frequency connecting shaft 21 drives the low-frequency rotating sleeve 24 to rotate. When the first lower ratchet 25 on the low-frequency rotating sleeve 24 rotates, the second surface of the first lower ratchet 25 presses against the second surface of the first upper ratchet 23 and pushes the first upper ratchet 23 upwards. The first upper ratchet 23 drives the low-frequency hammer 22 to move upwards and presses against the second elastic reset member 26. When the second surface of the first lower ratchet 25 has completely rotated past the second surface of the first upper ratchet 23 (the lower side of the first upper ratchet 23 is located above the first lower ratchet 25), due to the first upper ratchet... The first surface of tooth 23 and the first surface of the first lower ratchet 25 are both vertical surfaces. The first upper ratchet 23 is no longer supported by the first lower ratchet 25. The second elastic reset member 26 extends and resets. The low-frequency hammer 22 moves downward under the action of the second elastic reset member 26 and then strikes the low-frequency impact plate 19. Since the low-frequency impact plate 19 is fixedly installed with the drill rod 1, the low-frequency impact plate 19 forms an axial impact force on the drill rod 1. This process repeats. When the drill rod 1 rotates, the first lower ratchet 25 and the first upper ratchet 23 reciprocate to mesh and separate. When separating, the axial impact force formed by the low-frequency impact plate 19 on the drill rod 1 is transmitted to the drill bit through the drill rod 1, thereby accelerating the rock breaking speed of the drill bit.

[0063] Example 7: As an optimization of the above examples, as shown in the appendix. Figure 9 , 10As shown in Figure 13, the upper clutch includes two upper clutch assemblies evenly spaced along the circumference. Each upper clutch assembly includes an upper ratchet 29, an upper pawl 30, an upper hinge shaft 31, an inner connecting rod 32, an outer connecting rod 33, and a third elastic reset member 34. The upper ratchet 29 is fixedly installed on the lower outer side of the low-frequency connecting shaft 21. The upper hinge shaft 31 and the inner connecting rod 32 are fixedly installed at intervals on the upper end of the low-frequency rotating wheel 20. The distance between the upper hinge shaft 31 and the central axis of the drill pipe 1 is greater than the distance between the inner connecting rod 32 and the central axis of the drill pipe 1. The upper pawl 30 is hingedly installed on the upper part of the upper hinge shaft 31. The outer connecting rod 33 is fixedly installed on the lower side of the upper pawl 30. The third elastic reset member 34 is installed between the inner connecting rod 32 and the outer connecting rod 33. The upper pawl 30 engages with the upper ratchet 29 when the rotational speed of the drill pipe 1 is less than the set rotational speed, and the upper pawl 30 disengages from the upper ratchet 29 when the rotational speed of the drill pipe 1 is greater than or equal to the set rotational speed.

[0064] The lower end of the upper cover 17 is provided with a first limiting ring groove 35 with an opening facing downwards. The upper end of the low-frequency hammer 22, corresponding to the position of the first limiting ring groove 35, is provided with a second limiting ring groove 36 with an opening facing upwards. The upper part of the second elastic reset member 26 is located in the first limiting ring groove 35, and the lower part of the second elastic reset member 26 is located in the second limiting ring groove 36.

[0065] According to the requirements, the second elastic reset member 26 is a known prior art, such as a tension spring. In order to facilitate the disassembly and assembly of the tension spring, annular grooves are provided on the upper outer side of the inner connecting rod 32 and the lower outer side of the outer connecting rod 33. The two ends of the tension spring are hooked in the annular grooves. During use, the distance between the upper hinge shaft 31 and the central axis of the drill rod 1 is greater than the distance between the inner connecting rod 32 and the central axis of the drill rod 1. Thus, in the initial state, the second elastic reset member 26 pulls the outer connecting rod 33 tight, thereby causing the claw hook of the upper pawl 30 to be engaged in the slot 55 of the upper ratchet 29, and the upper pawl 30 and the upper ratchet 29 mesh with each other.

[0066] When the low-frequency rotary wheel 20 rotates at low speed with the drill rod 1, the upper clutch does not engage. The low-frequency rotary wheel 20 drives the upper ratchet 29 to rotate via the upper pawl 30 and the third elastic reset member 34. When the upper ratchet 29 rotates, it drives the low-frequency connecting shaft 21 to rotate. After the low-frequency connecting shaft 21 rotates, it drives the low-frequency rotating sleeve 24 to rotate. When the first lower ratchet 25 on the low-frequency rotating sleeve 24 rotates, the second surface of the first lower ratchet 25 presses against the second surface of the first upper ratchet 23 and pushes the first upper ratchet 23 upward. The first upper ratchet 23 drives the low-frequency hammer 22 to move upward and presses against the second upper ratchet 23. The first upper ratchet 23 drives the low-frequency hammer 22 to move upward and press against the second upper ratchet 23. When the second face of the first lower ratchet 25 has completely rotated past the second face of the first upper ratchet 23, since the first faces of the first upper ratchet 23 and the first faces of the first lower ratchet 25 are both vertical, the first upper ratchet 23 is no longer supported by the first lower ratchet 25. The second elastic reset member 26 extends and resets. The low-frequency hammer 22 moves downward under the action of the second elastic reset member 26 and then strikes the low-frequency impact plate 19. Since the low-frequency impact plate 19 is fixedly installed with the drill rod 1, the low-frequency impact plate 19 forms an axial impact force on the drill rod 1.

[0067] When the low-frequency rotor 20 rotates at high speed with the drill pipe 1, the upper pawl 30 gradually moves away from the slot 55 between the drill pipe 1 and the upper ratchet 29 after being subjected to a centrifugal force greater than the pulling force of the third elastic reset member 34. The upper pawl 30 no longer engages with the slot 55 of the upper ratchet 29, that is, the upper pawl 30 and the upper ratchet 29 separate from each other. The upper clutch is activated, and the low-frequency connecting shaft 21 rotates relative to the low-frequency rotor 20. That is, the low-frequency connecting shaft 21 is stationary relative to the outer shell, and the low-frequency rotor 20 rotates at high speed with the drill pipe 1.

[0068] Example 8: As an optimization of the above examples, as shown in the appendix Figure 9 , 10 As shown in Figures 14, 15, and 17, the high-frequency shaft punch assembly includes a high-frequency punching plate 37, a high-frequency rotating wheel 38, a high-frequency connecting shaft 39, a high-frequency punch hammer 40, and a lower clutch. The high-frequency rotating wheel 38 is fixedly installed on the outside of the drill rod 1 below the rotating disk 10. The high-frequency connecting shaft 39, which is hollow and fitted onto the outside of the drill rod 1, is located below the high-frequency rotating wheel 38. A lower clutch is provided between the upper end of the high-frequency connecting shaft 39 and the lower end of the high-frequency rotating wheel 38. When the rotation speed of the drill rod 1 is greater than or equal to the set rotation speed, the high-frequency connecting shaft 39 and the high-frequency rotating wheel 38 rotate synchronously. When the rotation speed of the drill rod 1 is less than the set rotation speed, the high-frequency connecting shaft 39 and the high-frequency rotating wheel 38 rotate relative to each other.

[0069] A tubular high-frequency hammer 40 is fitted on the outer side of the lower part of the high-frequency connecting shaft 39. A high-frequency impact plate 37 is fixedly installed on the outer side of the lower part of the drill rod 1 corresponding to the lower end of the high-frequency hammer 40. A limiting ring plate 41 fitted on the inner side of the upper part of the high-frequency hammer 40 is fixedly installed on the outer side of the drill rod 1 corresponding to the lower end of the high-frequency connecting shaft 39. An inner ring platform 42 is fixed on the inner side of the lower part of the high-frequency hammer 40 corresponding to the position below the limiting ring plate 41. A fourth elastic reset member 43 is provided between the lower end of the limiting ring plate 41 and the upper end of the inner ring platform 42.

[0070] A number of second upper ratchet teeth 44 are evenly distributed along the circumference of the upper inner side of the high-frequency hammer 40. A high-frequency rotating sleeve 45 is fixedly installed on the lower outer side of the high-frequency connecting shaft 39. At least one second lower ratchet tooth 46 that meshes with the second upper ratchet teeth 44 is fixed at the upper end of the high-frequency rotating sleeve 45. Both the second upper ratchet teeth 44 and the second lower ratchet tooth 46 are V-shaped with their openings facing downwards. The first surface of both the second and lower lower ratchet teeth 46 is a vertical surface, and the second surface of both the second and lower lower ratchet teeth 46 is an inclined surface. At least two lower limit blocks 47 are evenly distributed along the circumference of the outer side of the high-frequency hammer 40. Each lower limit block 47 has a lower limit plate 48 fixedly installed on both sides of the lower inner side of the cylinder 16. When the second lower ratchet 46 rotates with the high-frequency rotating sleeve 45, the second surface of the second upper ratchet 44 first rotates upward along the second surface of the second lower ratchet 46, which compresses the fourth elastic reset member 43. When the lower side of the second upper ratchet 44 is above the second lower ratchet 46, the fourth elastic reset member 43 resets, which causes the first surface of the second upper ratchet 44 to move downward along the first surface of the second lower ratchet 46 to the initial position. After the lower end of the high-frequency hammer 40 moves downward, it impacts the upper end of the high-frequency impact plate 37.

[0071] According to requirements, the fourth elastic reset element 43 is a known compression spring. A key is provided between the high-frequency rotating wheel 38 and the drill rod 1 to ensure torque transmission. The lower clutch is a known overspeed clutch. The overspeed clutch engages when the speed of the driven shaft is lower than that of the driven shaft, causing both shafts to rotate together. When the speed exceeds that of the driven shaft, it disengages the two shafts. Specifically, it can be a speed limiter (elevator). The second upper ratchet 44 and the second lower ratchet 46 correspond one-to-one. When the lower side of the second upper ratchet 44 is above the second lower ratchet 46, the fourth elastic reset... When component 43 is reset, the first surface of the second upper ratchet 44 moves downward along the first surface of the second lower ratchet 46 back to the initial position. After the lower end of the high-frequency hammer 40 moves downward, it impacts the upper end of the high-frequency impact plate 37. That is, when the tip of the second upper ratchet 44 is above the tip of the second lower ratchet 46, the fourth elastic reset component 43 resets, causing the first surface of the second upper ratchet 44 to move downward along the first surface of the second lower ratchet 46 back to the initial position. After the lower end of the high-frequency hammer 40 moves downward, it impacts the upper end of the high-frequency impact plate 37. The second lower ratchet 46 can also be a right-angled trapezoid that is narrower at the top and wider at the bottom.

[0072] Three lower limit blocks 47 are evenly distributed around the outer circumference of the high-frequency hammer 40. Each lower limit block 47 has a lower limit plate 48 fixedly installed on both sides of the lower inner side of the cylinder 16. The two lower limit plates 48 form a lower limit groove. The width of the lower limit groove matches the thickness of the lower limit block 47. In this way, the lower limit block 47 can only move up and down between the two lower limit plates 48.

[0073] The variable frequency shaft-torsion coupling impact drilling speed-up tool is connected to the screw drill bit. The screw drill bit housing is stationary, while the internal drill rod 1 rotates. The housing is connected to the screw drill bit housing, and the internal drill rod 1 is connected to the screw drill bit 1. The lower part of the drill rod 1 is connected to the drill bit. In the initial state, the second upper ratchet 44 and the second lower ratchet 46 are engaged with each other.

[0074] When the screw drill rotates, the outer casing remains stationary, the drill rod 1 rotates, and the high-frequency rotary wheel 38 rotates with the drill rod 1. When the drill rod 1 rotates at a low speed (less than the set speed), the lower clutch does not engage, and the high-frequency connecting shaft 39 rotates relative to the high-frequency rotary wheel 38. That is, the high-frequency connecting shaft 39 is stationary relative to the outer casing, and the high-frequency rotary wheel 38 rotates with the drill rod 1 at a low speed.

[0075] When drill rod 1 rotates at high speed (greater than or equal to the set speed), the lower clutch engages, and the high-frequency connecting shaft 39 and the high-frequency rotating wheel 38 rotate synchronously after being connected by transmission. The rotation of the high-frequency connecting shaft 39 drives the high-frequency rotating sleeve 45 to rotate. When the second lower ratchet 46 on the high-frequency rotating sleeve 45 rotates, the second surface of the second lower ratchet 46 presses against the second surface of the second upper ratchet 44 and pushes the second upper ratchet 44 upward. The second upper ratchet 44 drives the high-frequency hammer 40 to move upward and presses against the fourth elastic reset member 43. When the second surface of the second lower ratchet 46 has completely rotated past the second surface of the second upper ratchet 44 (the lower side of the second upper ratchet 44 is located above the second lower ratchet 46), due to the second upper ratchet... The first surface of the tooth 44 and the first surface of the second lower ratchet 46 are both vertical surfaces. The second upper ratchet 44 is no longer supported by the second lower ratchet 46. The fourth elastic reset member 43 extends and resets. The high-frequency hammer 40 moves downward under the action of the fourth elastic reset member 43 and then impacts the high-frequency impact plate 37. Since the high-frequency impact plate 37 is fixedly installed with the drill rod 1, the high-frequency impact plate 37 forms an axial impact force on the drill rod 1. This process repeats. When the drill rod 1 rotates, the second lower ratchet 46 and the second upper ratchet 44 reciprocate to mesh and separate. When separating, the axial impact force formed by the high-frequency impact plate 37 on the drill rod 1 is transmitted to the drill bit through the drill rod 1, thereby accelerating the rock breaking speed of the drill bit.

[0076] Example 9: As an optimization of the above examples, as shown in the appendix Figure 9 , 10As shown in Figure 16, the lower clutch includes two lower clutch assemblies evenly spaced along the circumference. Each lower clutch assembly includes a retaining ring 49, a lower pawl 50, a lower hinge shaft 51, an inner connecting post 52, an outer connecting post 53, and a fifth elastic reset element 54. A retaining ring 49 is fixedly installed on the upper end of the high-frequency rotating shaft. Several retaining grooves 55 are evenly distributed along the circumference of the retaining ring 49. The lower hinge shaft 51 and the inner connecting post 52 are fixedly installed at intervals on the lower end of the high-frequency rotating wheel 38. The lower hinge shaft 51 is aligned with the central axis of the drill pipe 1. The distance between them is greater than the distance between the inner connecting post 52 and the central axis of the drill pipe 1. The lower hinge shaft 51 is hinged to the lower part and a lower pawl 50 is installed. An outer connecting post 53 is fixedly installed on the upper side of the lower pawl 50. The fifth elastic reset member 54 is installed between the inner connecting post 52 and the outer connecting post 53. The lower pawl 50 separates from the retaining ring 49 when the speed of the drill pipe 1 is less than the set speed. The upper pawl 30 engages with the retaining ring 49 when the speed of the drill pipe 1 is greater than or equal to the set speed.

[0077] According to the requirements, the fifth elastic reset member 54 is a known prior art, such as a tension spring. In order to facilitate the disassembly and assembly of the tension spring, annular grooves are provided on the lower outer side of the inner connecting post 52 and the upper outer side of the outer connecting post 53. The two ends of the tension spring are hooked in the annular grooves. During use, the distance between the lower hinge shaft 51 and the central axis of the drill rod 1 is greater than the distance between the inner connecting post 52 and the central axis of the drill rod 1. Thus, in the initial state, the fifth elastic reset member 54 tightens the outer connecting post 53, thereby causing the claw hook of the lower pawl 50 to separate from the groove 55 of the retaining ring 49.

[0078] As the high-frequency rotary wheel 38 rotates at high speed with the drill rod 1, the lower clutch engages. The lower pawl 50, subjected to a centrifugal force greater than the tension of the fifth elastic reset member 54, gradually moves away from and engages in the groove 55 of the retaining ring 49. Thus, the high-frequency rotary wheel 38 drives the retaining ring 49 to rotate via the lower pawl 50. The rotation of the retaining ring 49 drives the high-frequency connecting shaft 39 to rotate, which in turn drives the high-frequency rotating sleeve 45 to rotate. When the second lower ratchet 46 on the high-frequency rotating sleeve 45 rotates, its second surface presses against the second surface of the second upper ratchet 44, pushing the second upper ratchet 44 upwards. After the high-frequency hammer 40 moves upward, it squeezes the fourth elastic reset member 43. When the second surface of the second lower ratchet 46 completely rotates past the second surface of the second upper ratchet 44, since the first surface of the second upper ratchet 44 and the first surface of the second lower ratchet 46 are both vertical surfaces, the second upper ratchet 44 is no longer supported by the second lower ratchet 46. The fourth elastic reset member 43 extends and resets. Under the action of the fourth elastic reset member 43, the high-frequency hammer 40 moves downward and strikes the high-frequency impact plate 37. Since the high-frequency impact plate 37 is fixedly installed with the drill rod 1, the high-frequency impact plate 37 forms an axial impact force on the drill rod 1.

[0079] As the high-frequency rotary wheel 38 rotates at low speed with the drill rod 1, the lower pawl 50, subjected to a centrifugal force less than the tension of the fifth elastic reset member 54, gradually moves away from the groove 55 of the clasp ring 49 and the drill rod 1. The lower pawl 50 no longer engages with the groove 55 of the clasp ring 49, the lower clutch does not operate, and the high-frequency connecting shaft 39 rotates relative to the high-frequency rotary wheel 38. That is, the high-frequency connecting shaft 39 is stationary relative to the outer casing, and the high-frequency rotary wheel 38 rotates at low speed with the drill rod 1.

[0080] Example 10: As an optimization of the above embodiments, as shown in the appendix Figure 9 As shown, positioning rings 56 are fixedly installed at both ends of the high-frequency rotor 38 and the low-frequency rotor 20. Several bearings 57 are provided at intervals between the inner side of the high-frequency connecting shaft 39, the inner side of the low-frequency connecting shaft 21 and the outer side of the drill rod 1.

[0081] The positioning ring 56 makes it easier to assemble and disassemble the high-frequency rotor 38 and the low-frequency rotor 20. Two bearings 57 are provided at intervals between the inner side of the high-frequency connecting shaft 39, the inner side of the low-frequency connecting shaft 21 and the outer side of the drill rod 1, so that the high-frequency rotor 38 and the high-frequency connecting shaft 39, and the low-frequency rotor 20 and the low-frequency connecting shaft 21 can rotate relative to each other.

[0082] When the screw drill rotates, the outer casing remains stationary, the drill rod 1 rotates, and the low-frequency rotary wheel 20 rotates with the drill rod 1. When the drill rod 1 rotates at high speed (greater than or equal to the set speed), the upper clutch is activated, and the low-frequency connecting shaft 21 rotates relative to the low-frequency rotary wheel 20. That is, the low-frequency connecting shaft 21 is stationary relative to the outer casing, and the low-frequency rotary wheel 20 rotates at low speed with the drill rod 1.

[0083] When drill rod 1 rotates at a low speed (less than the set speed), the upper clutch does not engage. The low-frequency rotary wheel 20 drives the upper ratchet 29 to rotate via the upper pawl 30 and the third elastic reset member 34. When the upper ratchet 29 rotates, it drives the low-frequency connecting shaft 21 to rotate. After the low-frequency connecting shaft 21 rotates, it drives the low-frequency rotating sleeve 24 to rotate. When the first lower ratchet 25 on the low-frequency rotating sleeve 24 rotates, the second surface of the first lower ratchet 25 presses against the second surface of the first upper ratchet 23 and pushes the first upper ratchet 23 upward. The first upper ratchet 23 drives the low-frequency hammer 22 to move upward and press against the first upper ratchet 23. When the second face of the first lower ratchet 25 has completely rotated past the second face of the first upper ratchet 23, since the first faces of the first upper ratchet 23 and the first faces of the first lower ratchet 25 are both vertical, the first upper ratchet 23 is no longer supported by the first lower ratchet 25. The second elastic reset member 26 extends and resets. The low-frequency hammer 22 moves downward under the action of the second elastic reset member 26 and then strikes the low-frequency impact plate 19. Since the low-frequency impact plate 19 is fixedly installed with the drill rod 1, the low-frequency impact plate 19 forms an axial impact force on the drill rod 1.

[0084] At the same time, the lower clutch does not engage. After the lower pawl 50 is subjected to a centrifugal force less than the tension of the fifth elastic reset member 54, it gradually moves away from the groove 55 of the drill rod 1 and the retaining ring 49. The lower pawl 50 no longer engages with the groove 55 of the retaining ring 49. The high-frequency connecting shaft 39 and the high-frequency rotating wheel 38 rotate relative to each other. That is, the high-frequency connecting shaft 39 is stationary relative to the outer shell, and the high-frequency rotating wheel 38 rotates at a low speed with the drill rod 1.

[0085] When the drill rod 1 rotates at high speed (greater than or equal to the set speed), the upper clutch is activated. The upper pawl 30 is subjected to centrifugal force greater than the tension of the third elastic reset member 34 and gradually moves away from the drill rod 1 and the upper ratchet 29. The upper pawl 30 no longer meshes with the upper ratchet 29. The low-frequency connecting shaft 21 and the low-frequency rotating wheel 20 rotate relative to each other. That is, the low-frequency connecting shaft 21 is stationary relative to the outer shell, and the low-frequency rotating wheel 20 rotates at high speed with the drill rod 1.

[0086] Simultaneously, the lower clutch actuates, and the lower pawl 50, subjected to a centrifugal force greater than the tension of the fifth elastic reset member 54, gradually moves away from and engages in the groove 55 of the retaining ring 49. Thus, the high-frequency rotating wheel 38 drives the retaining ring 49 to rotate via the lower pawl 50. The rotation of the retaining ring 49 drives the high-frequency connecting shaft 39 to rotate, which in turn drives the high-frequency rotating sleeve 45 to rotate. When the second lower ratchet 46 on the high-frequency rotating sleeve 45 rotates, its second surface presses against the second surface of the second upper ratchet 44, pushing the second upper ratchet 44 upwards. The second upper ratchet 44 then drives the high-frequency impact hammer 40. After moving upward, the fourth elastic reset member 43 is squeezed. When the second surface of the second lower ratchet 46 has completely rotated past the second surface of the second upper ratchet 44, since the first surface of the second upper ratchet 44 and the first surface of the second lower ratchet 46 are both vertical surfaces, the second upper ratchet 44 is no longer supported by the second lower ratchet 46. The fourth elastic reset member 43 extends and resets. The high-frequency hammer 40 moves downward under the action of the fourth elastic reset member 43 and then strikes the high-frequency impact plate 37. Since the high-frequency impact plate 37 is fixedly installed with the drill rod 1, the high-frequency impact plate 37 forms an axial impact force on the drill rod 1.

[0087] Depending on the requirements, the number of first upper ratchet 23 and first lower ratchet 25 can be less than the number of second upper ratchet 44 and second lower ratchet 46 (when the drill rod 1 rotates once, the number of times the low-frequency hammer 22 impacts the low-frequency impact plate 19 is less than the number of times the high-frequency hammer 40 impacts the high-frequency impact plate 37, and the frequency is lower). The height of the first surface (vertical surface) of the first upper ratchet 23 is greater than the height of the first surface (vertical surface) of the second upper ratchet 44, and the weight of the low-frequency hammer 22 is greater than the weight of the high-frequency hammer 40 (when the drill rod 1 rotates once, the impact force of the low-frequency hammer 22 on the low-frequency impact plate 19 is greater than the impact force of the high-frequency hammer 40 on the high-frequency impact plate 37). In this way, the first upper ratchet 23... When drill pipe 1 rotates at low speed, the first lower ratchet 25 interacts with the low-frequency impact hammer 22, which will give the low-frequency impact plate 19 a large and low-frequency axial impact force. When drill pipe 1 rotates at high speed, the second upper ratchet 44 and the second lower ratchet 46 interact with the high-frequency impact hammer 40, which will give the high-frequency impact plate 37 a small and high-frequency axial impact force. When drill pipe 1 rotates at low or high speed, the torsional impact hammer 3 always periodically impacts the torsional impact shell. The impact received by the torsional impact shell is transmitted to drill pipe 1 to form a torsional impact. Drill pipe 1 further transmits the force to the drill bit. In this way, the variable frequency shaft-torsion coupling impact drilling speed-up tool will transmit the periodic torque and axial impact to the drill bit.

[0088] The variable frequency shaft-torsion coupling impact drilling speed-up tool can switch its working state according to the drill pipe speed and the drilling difficulty of the formation. When the formation is difficult to drill, the tool will be in low frequency shaft-impact mode, applying a low-frequency but strong shaft-impact force to the drill bit; when the formation is easy to drill, the tool will be in high frequency shaft-impact mode, the drill bit rotation frequency will be increased, and a high-frequency but weak axial impact force will be applied to the drill bit.

[0089] The above technical features constitute various embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A torsional impact assembly, characterized in that... The system includes a drill pipe, a housing, a torsion impact shell, and a torsion impact hammer. The outer housing is fitted over the drill pipe, and a torsion turntable fitted over the drill pipe is fixedly installed inside the housing. A torsion impact shell, fitted inside the housing, is fixedly installed on the outer side of the drill pipe below the torsion turntable. The torsion impact shell has several mounting cavities spaced circumferentially inside. Each mounting cavity has a vertically penetrating track groove on its upper side. A push rod is slidably installed in each track groove. When the push rod slides relative to the track groove, the center distance between it and the drill pipe first increases and then remains constant, or first increases and then remains constant. The size decreases as the push rod decreases. Each push rod has a torsional impact hammer fixedly installed at its lower end and slidably installed in the mounting cavity. A first elastic reset element is provided between the torsional impact hammer and the inner wall of the mounting cavity. A cam block is fixedly installed on the lower side of the torsional turntable corresponding to each push rod position. When the center distance between the push rod and the drill rod increases, it contacts the cam block and the first elastic reset element is compressed. When the center distance between the push rod and the drill rod decreases or remains unchanged, it separates from the cam block and the first elastic reset element resets. After the first elastic reset element resets, the torsional impact hammer strikes the torsional impact shell and then acts on the drill rod.

2. The torsional impact assembly according to claim 1, characterized in that... The torsional impact housing includes a torsional impact cylinder and a rotating disk. The torsional impact cylinder is an annular cylinder with an open lower end and a closed upper end. The inner wall of the torsional impact cylinder and the drill pipe are fixedly installed together. The lower end of the torsional impact cylinder is fixedly installed together with the upper end of the rotating disk. Two track grooves are evenly distributed along the circumference on the upper side of the torsional impact cylinder. The track grooves include a compression section and a reset section that are interconnected. Both the compression section and the reset section are curved. A cam ring is fixedly installed on the lower side of the torsional rotating disk. A crescent-shaped cam block is fixed on the outer side of the cam ring corresponding to the position of the compression section. The lower outer side of the push rod is located inside the compression section. The first elastic reset element includes a compression spring disposed between the torsional impact hammer and the corresponding reset section. The cam block has a limiting surface and a separating surface. The limiting surface is curved. The limiting surface abuts against the upper outer side of the push rod. When the torsional impact cylinder rotates, the push rod moves away from the drill pipe's central axis when it moves from the compression section to the reset section. When the push rod moves into the reset section, it separates from the limiting surface, and the torsional impact hammer strikes the torsional impact cylinder under the action of the compression spring.

3. The torsional impact assembly according to claim 2, characterized in that... The separation surface is an arc or inclined surface, with a circular arc transition between the separation surface and the limiting surface, and a smooth transition between the separation surface and the outer side of the cam ring. The compression section is an arc concentric with the torsional impact cylinder.

4. The torsional impact assembly according to claim 1, 2, or 3, characterized in that... The outer casing includes a cylinder, an upper cover, and a lower cover. The outer side of the upper cover is fixedly installed with the inner side of the upper part of the cylinder, and the inner side of the upper cover is rotatably and sealingly installed with the outer side of the upper part of the drill rod. The outer side of the lower cover is fixedly installed with the inner side of the lower part of the cylinder, and the inner side of the lower cover is rotatably and sealingly installed with the outer side of the lower part of the drill rod. The inner side of the middle part of the cylinder is fixedly installed with the outer side of the torsion turntable.

5. A variable frequency shaft-torsion coupled impact drilling speed-up tool using the torsional impact assembly as described in any one of claims 1 to 4, characterized in that... The device includes a torsional impact assembly, a low-frequency axial impact assembly, and a high-frequency axial impact assembly. The low-frequency axial impact assembly is installed between the outer side of the drill rod and the inner side of the housing, corresponding to the position above the torsional turntable. The high-frequency axial impact assembly is installed between the outer side of the drill rod and the inner side of the housing, corresponding to the position below the torsional impact housing. When the rotational speed of the drill rod is less than the set rotational speed, the low-frequency axial impact assembly transmits low-frequency axial impact to the drill rod. When the rotational speed of the drill rod is greater than or equal to the set rotational speed, the high-frequency axial impact assembly transmits high-frequency axial impact to the drill rod.

6. The variable frequency shaft-torsion coupling impact drilling speed-up tool according to claim 5, characterized in that... The low-frequency shaft punch assembly includes a low-frequency punching plate, a low-frequency rotating wheel, a low-frequency connecting shaft, a low-frequency punch hammer, and an upper clutch. The low-frequency punching plate and the low-frequency rotating wheel are fixedly installed on the outside of the drill rod at intervals from bottom to top, corresponding to the position above the rotary table. A hollow low-frequency connecting shaft is fitted on the outside of the drill rod corresponding to the position above the low-frequency rotating wheel. An upper clutch is provided between the lower part of the low-frequency connecting shaft and the low-frequency rotating wheel. When the drill rod speed is less than the set speed, the low-frequency connecting shaft and the low-frequency rotating wheel rotate synchronously. When the drill rod speed is greater than or equal to the set speed, the low-frequency connecting shaft and the low-frequency rotating wheel rotate relative to each other. A tubular low-frequency hammer is fitted between the outer side of the low-frequency connecting shaft and the inner side of the upper part of the cylinder. Several upper ratchet teeth are evenly distributed along the circumference of the inner side of the upper part of the low-frequency hammer. A low-frequency rotating sleeve is fixedly installed on the outer side of the upper part of the low-frequency connecting shaft. At least one lower ratchet tooth is fixed to the upper end of the low-frequency rotating sleeve, meshing with the upper ratchet teeth. Both the upper and lower ratchet teeth are V-shaped with their openings facing downwards. The first surface of both the upper and lower ratchet teeth is vertical, while the second surface of both is inclined. A second elastic element is provided between the upper end of the low-frequency hammer and the lower end of the upper cover. The reset component has at least two upper limit blocks evenly distributed along the circumference of the outer side of the low-frequency hammer. Each upper limit block has an upper limit plate fixedly installed on both sides of the inner side of the upper part of the cylinder. When the first lower ratchet rotates with the low-frequency rotating sleeve, the second surface of the first upper ratchet first rotates upward along the second surface of the first lower ratchet, which compresses the second elastic reset component. When the lower side of the first upper ratchet is above the first lower ratchet, the second elastic reset component resets, which causes the first surface of the first upper ratchet to move downward along the first surface of the first lower ratchet to the initial position. After the lower end of the low-frequency hammer moves downward, it impacts the upper end of the low-frequency impact plate.

7. The variable frequency shaft-torsion coupling impact drilling speed-up tool according to claim 6, characterized in that... The upper clutch includes two upper clutch assemblies evenly spaced along the circumference. Each upper clutch assembly includes an upper ratchet, an upper pawl, an upper hinge shaft, an inner connecting rod, an outer connecting rod, and a third elastic reset element. The upper ratchet is fixedly installed on the lower outer side of the low-frequency connecting shaft. The upper hinge shaft and the inner connecting rod are fixedly installed at intervals on the upper end of the low-frequency rotating wheel. The distance between the upper hinge shaft and the drill pipe center axis is greater than the distance between the inner connecting rod and the drill pipe center axis. The upper pawl is hingedly installed on the upper part of the upper hinge shaft. The outer connecting rod is fixedly installed on the lower side of the upper pawl. The third elastic reset element is installed between the inner connecting rod and the outer connecting rod. The upper pawl engages with the upper ratchet when the drill pipe speed is less than the set speed, and disengages from the upper ratchet when the drill pipe speed is greater than or equal to the set speed. The lower end of the upper cover is provided with a first limiting ring groove with an opening facing downwards. The upper end of the low-frequency hammer corresponding to the position of the first limiting ring groove is provided with a second limiting ring groove with an opening facing upwards. The upper part of the second elastic reset member is located in the first limiting ring groove, and the lower part of the second elastic reset member is located in the second limiting ring groove.

8. The variable frequency shaft-torsion coupling impact drilling speed-up tool according to claim 6 or 7, characterized in that... The high-frequency shaft punch assembly includes a high-frequency punching plate, a high-frequency rotating wheel, a high-frequency connecting shaft, a high-frequency punch hammer, and a lower clutch. A high-frequency rotating wheel is fixedly installed on the outside of the drill rod corresponding to the position below the rotating disk. A hollow high-frequency connecting shaft is fitted on the outside of the drill rod below the high-frequency rotating wheel. A lower clutch is provided between the upper end of the high-frequency connecting shaft and the lower end of the high-frequency rotating wheel. When the drill rod speed is greater than or equal to the set speed, the high-frequency connecting shaft and the high-frequency rotating wheel rotate synchronously. When the drill rod speed is less than the set speed, the high-frequency connecting shaft and the high-frequency rotating wheel rotate relative to each other. A tubular high-frequency impact hammer is fitted on the outer side of the lower part of the high-frequency connecting shaft. A high-frequency impact plate is fixedly installed on the outer side of the lower part of the drill rod corresponding to the lower end of the high-frequency impact hammer. A limiting ring plate fitted on the inner side of the upper part of the high-frequency impact hammer is fixedly installed on the outer side of the drill rod corresponding to the lower end of the high-frequency connecting shaft. An inner ring platform is fixed on the inner side of the lower part of the high-frequency impact hammer corresponding to the position below the limiting ring plate. A fourth elastic reset member is provided between the lower end of the limiting ring plate and the upper end of the inner ring platform. Several second upper ratchet teeth are evenly distributed along the circumference of the upper inner side of the high-frequency hammer. A high-frequency rotating sleeve is fixedly installed on the lower outer side of the high-frequency connecting shaft. At least one second lower ratchet tooth is fixed at the upper end of the high-frequency rotating sleeve, which meshes with the second upper ratchet teeth. Both the second upper and lower ratchet teeth are V-shaped with their openings facing downwards. The first surfaces of the second and lower ratchet teeth are both vertical surfaces, and the second surfaces of the second and lower ratchet teeth are both inclined surfaces. At least two lower limit blocks are evenly distributed along the circumference of the outer side of the high-frequency hammer. Each lower limit block has a lower limit plate fixedly installed on both sides of the lower inner side of the cylinder. When the second lower ratchet tooth rotates with the high-frequency rotating sleeve, the second surface of the second upper ratchet tooth first rotates upwards along the second surface of the second lower ratchet tooth, which compresses the fourth elastic reset member. When the lower side of the second upper ratchet tooth is above the second lower ratchet tooth, the fourth elastic reset member resets, which causes the first surface of the second upper ratchet tooth to move downwards along the first surface of the second lower ratchet tooth to the initial position. After the lower end of the high-frequency hammer moves downwards, it impacts the upper end of the high-frequency impact plate.

9. The variable frequency shaft-torsion coupling impact drilling speed-up tool according to claim 8, characterized in that... The lower clutch includes two lower clutch assemblies evenly spaced along the circumference. Each lower clutch assembly includes a retaining ring, a lower pawl, a lower hinge shaft, an inner connecting post, an outer connecting post, and a fifth elastic reset element. A retaining ring is fixedly installed on the upper end of the high-frequency rotating shaft. Several retaining grooves are evenly distributed along the circumference of the retaining ring. The lower hinge shaft and the inner connecting post are fixedly installed at intervals on the lower end of the high-frequency rotating wheel. The distance between the lower hinge shaft and the drill pipe center axis is greater than the distance between the inner connecting post and the drill pipe center axis. A lower pawl is hingedly installed on the lower part of the lower hinge shaft. An outer connecting post is fixedly installed on the upper side of the lower pawl. The fifth elastic reset element is installed between the inner connecting post and the outer connecting post. The lower pawl separates from the retaining ring when the drill pipe speed is less than the set speed, and the upper pawl engages with the retaining ring when the drill pipe speed is greater than or equal to the set speed.

10. The variable frequency shaft-torsion coupling impact drilling speed-up tool according to claim 8, characterized in that... Positioning rings are fixedly installed at both ends of the high-frequency rotor and the low-frequency rotor. Several bearings are provided at intervals between the inner side of the high-frequency connecting shaft, the inner side of the low-frequency connecting shaft and the outer side of the drill rod.

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