A rotary force torque increasing device

Abstract

The application discloses a rotary force torque increasing device, relates to the field of drilling tool torque increasing technology, and comprises a shell, a main shaft is arranged in the shell, an impact cylinder is arranged on the outer side of the main shaft, a torsion ring is arranged at the connecting position of the main shaft and the impact cylinder, a baffle ring is arranged below the main shaft, an upper energy storage impact piece is arranged on the top of the impact cylinder, a pressing ring is arranged on the bottom of the impact cylinder, a limiting bearing is arranged between the baffle ring and the pressing ring, a limiting bearing is also arranged on the top of the upper energy storage impact piece, a locking sleeve is arranged at the bottom of the shell, a lower energy storage impact piece is arranged between the locking sleeve and the baffle ring, a lower connector is arranged at the bottom of the main shaft, the lower connector extends out of the locking sleeve, and the lower connector is connected with a drill bit.

Description

Technical Field

[0001] This invention relates to the field of drill bit torque enhancement technology, specifically a rotary torque enhancement device. Background Technology

[0002] In oil, gas, and geological exploration drilling operations, the torque required for the drill bit to break rocks is a key factor determining drilling efficiency. When encountering hard formations or deep, complex rock formations, conventional rotary drilling methods often suffer from insufficient torque, leading to a sharp drop in drilling speed or even stuck drill bit accidents. To address this, the industry has developed various torque-enhancing devices.

[0003] In existing technologies, the impact mating surfaces of the spindle and the hammer often employ a planar contact design. Theoretically, planar contact can uniformly transmit impact force. However, under actual working conditions, due to the complex drilling environment, the drill string inevitably experiences axial runout, radial runout, and installation alignment errors downhole. This causes the originally designed ideal planar contact to easily evolve into localized line contact or even point contact during actual collisions. This non-uniform contact leads to a sharp increase in impact pressure within a very small area, far exceeding the allowable contact stress of the material. This results in plastic deformation, fatigue cracks, and even localized fractures on the impact surfaces of the hammer or spindle, severely limiting the service life of downhole tools.

[0004] Secondly, the existing torque-enhancing devices have a single impact direction. Traditional impact-type torque-enhancing devices mainly generate axial impact, which is parallel to the drill bit's rotation axis. It mainly assists the drill bit in overcoming the rock's indentation hardness. However, current torque-enhancing devices generally lack effective utilization of radial impact, resulting in a relatively simple form of impact energy utilization, making it difficult to fully utilize the comprehensive effectiveness of impact torque enhancement.

[0005] Due to the lack of buffer and energy storage structures, existing drill bits are prone to unstable transmission of impact energy when encountering fluctuations in drilling pressure at the bottom of the well or sudden changes in the softness or hardness of the formation. This can easily affect the stability of the torque-enhancing effect and even cause impact damage to the drill bit and the lower drilling tools.

[0006] Therefore, there is an urgent need in this field for an innovative torque-enhancing device for drilling that can not only improve the rock-breaking efficiency of the torque-enhancing device, but also extend the service life of the drill bit, so as to meet the technical requirements of efficient drilling in deep and complex formations. Summary of the Invention

[0007] The purpose of this invention is to provide a torque-increasing device to solve the problems mentioned in the prior art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: The rotary torque amplification device includes a housing, a main shaft is installed inside the housing, an impact cylinder is sleeved on the outside of the main shaft, a torque ring is provided at the connection between the main shaft and the impact cylinder, a retaining ring is provided below the main shaft, an upper energy storage impact member is installed on the top of the impact cylinder, a pressure ring is installed on the bottom of the impact cylinder, a limit bearing is installed between the retaining ring and the pressure ring, a limit bearing is also installed on the top of the upper energy storage impact member, a locking sleeve is installed at the bottom of the housing, a lower energy storage impact member is provided between the locking sleeve and the retaining ring, a lower connector is provided at the bottom of the main shaft, the lower connector extends out of the locking sleeve, and the lower connector is connected to a drill bit.

[0009] As a preferred technical solution, the main shaft is divided into a contact area and a connection area by the retaining ring. The contact area is symmetrically provided with contact bosses on the outer side, and arc-shaped concave teeth are provided on both sides of the contact bosses. The torsion ring is disposed at the gap between the contact area and the impact cylinder.

[0010] As a preferred technical solution, a punch is provided between the inner wall of the impact cylinder and the outer side of the main shaft. The punch is arc-shaped, and the arc of the punch is consistent with the arc of the outer wall of the main shaft. The punch is located between the two contact bosses. Arc-shaped protrusions are provided on both sides of the punch. A connecting column is provided on the outer wall of the punch. Connecting grooves are symmetrically opened on the inner wall of the impact cylinder.

[0011] As a preferred technical solution, the arc-shaped concave tooth cooperates with the arc-shaped convex tooth, and when the punch collides with the contact boss, the arc-shaped convex tooth is completely embedded in the arc-shaped concave tooth.

[0012] As a preferred technical solution, the upper energy storage impact member includes a lower seat and an upper seat nested in the lower seat. An energy storage spring assembly is provided between the lower seat and the upper seat. The energy storage spring assembly includes an outer spring and an inner spring with a helical direction opposite to that of the outer spring. Dustproof scraper rings are provided on both the outer and inner sides of the upper energy storage impact member.

[0013] As a preferred technical solution, a limiting ring is provided on the inner side of the housing, and the limiting bearing is installed at the bottom of the limiting ring. The limiting bearing is fixed to the upper energy storage impact member by the limiting ring.

[0014] As a preferred technical solution, the lower energy storage impact member is installed between the retaining ring and the locking sleeve. The lower energy storage impact member has the same structure as the upper energy storage impact member, and the installation directions of the lower energy storage impact member and the upper energy storage impact member are opposite.

[0015] As a preferred technical solution, a transmission sleeve is provided on the top of the torsion ring, and the transmission sleeve connects the upper energy storage impact member and the limiting bearing.

[0016] As a preferred technical solution, the contact surface between the connecting column and the connecting groove is an arc surface, and the punch can rotate around the connecting column as the center.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. The present invention is provided with a contact boss, and the arc-shaped concave teeth on the contact boss cooperate with the arc-shaped convex teeth of the punch, changing the planar contact between the main shaft and the punch to an arc-shaped contact, which can disperse the impact pressure and avoid local damage caused by planar line contact due to installation or movement errors, and avoid premature cracking and peeling of metal.

[0019] 2. By adding upper and lower energy storage impact components, radial impact can be supplemented. Replacing the traditional thrust bearing with a more elastic energy storage impact component is equivalent to installing an adaptive axial impact adjuster on the drill bit, so that when it encounters hard rocks, it no longer hits them head-on, but impacts the formation through high-frequency multi-directional vibration.

[0020] 3. The energy storage spring assembly redirects the hard impact caused by axial vibration, which was originally acting on the lower drill bit, to the upper and lower energy storage impact components. This avoids directly transmitting the harmful vibrations generated during the impact to the expensive upper instruments. The upper and lower energy storage impact components act as mechanical filters, absorbing the instantaneous high-frequency peak stress generated by the collision while transmitting the torque-increasing power. When the drill bit encounters an extremely hard interlayer, the drill bit vibrates violently axially. The upper and lower energy storage impact components drive the drill bit to retreat and buffer, effectively preventing the cutting teeth of the drill bit from chipping and the spindle from breaking. This significantly improves the mechanical environment of the lower drill bit assembly, increases the service life of the drill bit and the rock-breaking efficiency in extreme formations. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a cross-sectional structural diagram of the main body of the present invention; Figure 3 This is a schematic diagram of the main shaft of the present invention; Figure 4 This is a schematic diagram of the impact hammer structure of the present invention; Figure 5 This is a cross-sectional structural diagram of the energy storage impact component of the present invention; Figure 6 This is a cross-sectional structural diagram of the main body of the invention; Figure 7 yes Figure 2 A magnified structural diagram of point A in the middle.

[0022] In the diagram: 1. Housing; 2. Main shaft; 3. Impact cylinder; 4. Upper energy storage impact component; 5. Limit bearing; 6. Locking sleeve; 7. Lower energy storage impact component; 8. Transmission sleeve; 11. Limiting ring; 21. Torque ring; 22. Retaining ring; 23. Lower connector; 24. Contact area; 25. Connecting area; 31. Pressure ring; 32. Punch; 33. Connecting groove; 41. Lower seat; 42. Upper seat; 43. Energy storage spring assembly; 44. Dustproof scraper ring; 2401, Contact boss; 2402, Arc-shaped concave tooth; 3201, Arc-shaped convex tooth; 3202, Connecting post; 4301, Outer spring; 4302, Inner spring. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Example: Figures 1-7 As shown, the present invention provides a technical solution for a rotary torque amplification device, which includes a housing 1, a main shaft 2 installed inside the housing 1, an impact cylinder 3 sleeved on the outside of the main shaft 2, a torque ring 21 provided at the connection between the main shaft 2 and the impact cylinder 3, a retaining ring 22 provided below the main shaft 2, an upper energy storage impact member 4 installed on the top of the impact cylinder 3, a pressure ring 31 installed on the bottom of the impact cylinder 3, a limit bearing 5 installed between the retaining ring 22 and the pressure ring 31, a limit bearing 5 also installed on the top of the upper energy storage impact member 4, a locking sleeve 6 installed at the bottom of the housing 1, a lower energy storage impact member 7 provided between the locking sleeve 6 and the retaining ring 22, a lower connector 23 provided at the bottom of the main shaft 2, the lower connector 23 extending out of the locking sleeve 6, and the lower connector 23 connected to the drill bit.

[0025] The long-term operational bottleneck of existing drilling equipment's torque-enhancing devices lies in the fatigue failure of the impact surfaces of the hammer 32 and the spindle 2. High-frequency, high-stress metal collisions easily induce the generation and propagation of microcracks. This technical solution improves the contact surface of the impact components. In the ideal state of traditional impactors, the contact stress between planes is uniform. However, in actual downhole operations, due to the slight oscillation of the spindle 2 or the installation tolerance of the hammer 32, it is extremely difficult for the two planes to remain absolutely parallel. Once a slight tilt occurs, the contact nature changes from "surface contact" to "line contact" or even "point contact," resulting in a large stress concentration at the edge, leading to chipping, indentation, or fatigue spalling on the metal surface. By improving the original collision contact surface design to an arc-shaped contact to disperse impact stress, and by laying a buffer coating on the contact surface, the technical problem of easy damage to the impact contact surface of the existing impactor under long-term collision conditions is solved. Furthermore, the impact hammer 32 and the impact cylinder 3 are movably connected through the cooperation of the connecting column 3202 and the connecting groove 33, allowing the impact hammer 32 to rotate within a certain range, which can avoid hard collision between the impact hammer 32 and the main shaft 2. By adjusting the contact surface between the impact hammer 32 and the main shaft 2, impact loss is reduced, and the service life of the torque-increasing device is extended. In terms of mechanical mechanism, the arc-shaped contact pair replaces the traditional planar collision, effectively eliminating the edge stress concentration induced by installation deviation or the swing of the main shaft 2, and realizing the diffusion and dispersion of impact energy and pressure. Meanwhile, by replacing the rigid thrust bearing with upper and lower energy storage impact components, a floating support system with axial and radial flexibility is constructed for the main shaft 2. At the moment of impact of the hammer 32, through vector decomposition of the contact interface, the energy originally lost on the rigid support is converted into axial high-frequency chatter and radial pulsating impact, which significantly alleviates the hard impact of the axial force on the lower drill bit, thereby improving the service life of the lower drill bit.

[0026] Existing impactors increase torque through impact components, but when the drill bit gets stuck vertically, the upper energy-storing impactor 4 and the lower energy-storing impactor 7 can be added to release the drill bit vertically. After replacing them with the upper energy-storing impactor 4 and the lower energy-storing impactor 7, the spindle 2 becomes an axial floating load. When the hammer 32 impacts the spindle 2, the drill bit at the bottom is no longer subject to rigid axial constraint. The energy generated at the moment of impact induces axial chatter and radial vibration of the spindle 2. By adding the upper energy-storing impactor 4 and the lower energy-storing impactor 7, the collision energy that was originally lost on the rigid bearing is converted into radial and axial auxiliary impacts that help break rocks, giving the tool stronger penetration and higher reliability when facing deep geothermal drilling and heterogeneous formations.

[0027] The main shaft 2 is divided into a contact area 24 and a connecting area 25 by the retaining ring 22. The contact area 24 is symmetrically provided with contact bosses 2401 on the outer side. Both sides of the contact bosses 2401 are provided with arc-shaped concave teeth 2402. The torsion ring 21 is located in the gap between the contact area 24 and the impact cylinder 3.

[0028] A hammer 32 is installed between the inner wall of the impact cylinder 3 and the outer side of the spindle 2. The hammer 32 is arc-shaped, and its curvature matches that of the outer wall of the spindle. The hammer 32 is located between two contact bosses 2401. Arc-shaped protrusions 3201 are provided on both sides of the hammer 32. A connecting post 3202 is provided on the outer wall of the hammer 32. Connecting grooves 33 are symmetrically opened on the inner wall of the impact cylinder 3. In the crushing of high-hardness rocks, the arc-shaped contact between the arc-shaped protrusions 3201 and the arc-shaped concave teeth 2402 helps to disperse the impact pressure, rather than acting directly on the contact plane between the hammer 32 and the spindle 2. The arc-shaped tooth structure can better diffuse energy than the flat structure, which helps to reduce the material wear of the tool in the conventional rotation mode, thereby improving rock breaking efficiency and extending service life. For the torque-enhancing device, this focused impact can ensure that the pulsating torque acts more violently on the spindle 2, forcibly breaking the jammed state of the drill bit. At the same time, a buffer structure can be further laid on the contact surface between the hammer 3 and the spindle 2 to reduce collision damage.

[0029] The upper energy storage impact member 4 includes a lower seat 41 and an upper seat 42 nested within the lower seat 42. An energy storage spring assembly 43 is provided between the lower seat 41 and the upper seat 42. The energy storage spring assembly 43 includes an outer spring 4301 and an inner spring 4302 with a spiral direction opposite to that of the outer spring 4301. Dustproof scraper rings 44 are provided on both the outer and inner sides of the upper energy storage impact member 4. By setting the upper energy storage impact member 4, the spindle 2 is affected by the upper energy storage impact member 4. When the fan-shaped impact 32 hits the spindle 2, the system is no longer subject to rigid axial constraint. The energy generated at the moment of impact will induce axial chatter and radial vibration of the spindle 2. The impact force, due to the arc-shaped contact surface between the hammer 32 and the spindle 2 with a certain slope, is decomposed into three components: circumferential tangential force, providing the pulsating torque required for torque amplification; axial force, which compresses the upper energy storage impact member 4, generating high-frequency axial oscillation; and radial force, which, because springs do not provide the extremely high lateral stiffness constraint of bearings, causes the spindle 2 to produce instantaneous radial displacement, i.e., radial impact. Radial impact can induce lateral cutting and trajectory deflection of the drill bit, helping to break the bottom rock, especially when dealing with plastic formations, effectively preventing drill bit jamming. At the same time, the upper energy storage impact member 4 acts as an axial and lateral shock absorber for the drill bit, absorbing the stress originally generated by the hard axial impact, extending the service life of the upper measuring instruments. Furthermore, by adjusting the preload of the energy storage spring assembly 43, the natural frequency of the system can be changed, thereby mechanically tuning the impact frequency to a certain extent and avoiding the resonance zone of the drill string system.

[0030] The energy storage spring assembly 43 is prone to lateral bending when compressed. The upper and lower seats are designed as a fitted sleeve structure, which actually transforms the upper and lower seats into a set of guiding mechanisms. When the radial component force generated by the arc-shaped impact pair causes the main shaft 2 to strike the formation laterally, the nested sleeve can ensure that the radial displacement of the main shaft 2 is translational rather than tilted. After the impact is completed, the powerful radial restoring torque provided by the energy storage spring assembly 43 can instantly pull the main shaft back to the central axis, ensuring that the radial impact is a high-frequency, rhythmic, and controlled pulse. At the same time, when arranging the energy storage spring assembly 43, it is important to note that the outer spring 4301 and the inner spring 4302 must adopt opposite helical directions. If the helical directions are the same, when subjected to pressure or torque deformation, the spring wire of the inner spring 4302 is very likely to get embedded in the gap of the outer spring 4301, resulting in serious mechanical jamming. When the upper and lower seats slide relative to each other, solid particles and rock cuttings in the well fluid can easily enter the gap. The dust scraper rings 44 set on the outermost layer of the lower seat 41 and the upper seat 42 can scrape off the rock cuttings and impurities attached to the sidewalls, preventing the liquid hammer effect or debris jamming from causing the upper and lower seats to jam.

[0031] A limit ring 11 is provided on the inner side of the housing 1, and a limit bearing 5 is installed at the bottom of the limit ring 11. The limit bearing 5 is fixed to the upper energy storage impact member 4 by the limit ring 11.

[0032] The lower energy storage impact component 7 is installed between the retaining ring 22 and the locking sleeve 6. The lower energy storage impact component 7 has the same structure as the upper energy storage impact component 4, but the installation directions of the lower energy storage impact component 7 and the upper energy storage impact component 4 are opposite.

[0033] The top of the torsion ring 21 is provided with a transmission sleeve 8, which is connected to the energy storage impact member 4 and the limit bearing 5.

[0034] A rotating shaft 81 is provided in the middle of the valve core 8, and a worm gear 8101 is provided at one end of the rotating shaft 81. The worm gear 8101 is located on the outer wall of the filter valve 6, and a sealing ring 8102 is provided at the edge of the valve core 8.

[0035] The contact surface between the connecting post 3202 and the connecting groove 33 is an arc surface, and the punch 32 can rotate around the connecting post 3202 as the center.

[0036] Working principle of the invention: The long-term operational bottleneck of existing drilling equipment's torque-enhancing devices lies in the fatigue failure of the impact surfaces of the hammer 32 and the spindle 2. High-frequency, high-stress metal collisions easily induce the generation and propagation of microcracks. This device improves the contact surface of the impact components. In the ideal state of traditional impactors, the contact stress between planes is uniform. However, in actual downhole operations, due to the slight oscillation of the spindle 2 or the installation tolerance of the hammer 32, it is extremely difficult for the two planes to remain absolutely parallel. Once a slight tilt occurs, the contact nature changes from "surface contact" to "line contact" or even "point contact," resulting in a large stress concentration at the edge, leading to chipping, indentation, or fatigue spalling on the metal surface. By improving the original collision contact surface design to an arc-shaped contact to disperse impact stress, and by laying a buffer coating on the contact surface, the technical problem of easy damage to the impact contact surface of the existing impactor under long-term collision conditions is solved. Furthermore, the impact hammer 32 and the impact cylinder 3 are movably connected through the cooperation of the connecting column 3202 and the connecting groove 33, allowing the impact hammer 32 to rotate within a certain range, which can avoid hard collision between the impact hammer 32 and the main shaft 2. By adjusting the contact surface between the impact hammer 32 and the main shaft 2, impact loss is reduced, and the service life of the torque-increasing device is extended. In terms of mechanical mechanism, the arc-shaped contact pair replaces the traditional planar collision, effectively eliminating the edge stress concentration induced by installation deviation or the swing of the main shaft 2, and realizing the diffusion and dispersion of impact energy and pressure. Meanwhile, by replacing the rigid thrust bearing with upper and lower energy storage impact components, a floating support system with axial and radial flexibility is constructed for the main shaft 2. At the moment of impact of the hammer 32, through vector decomposition of the contact interface, the energy originally lost on the rigid support is converted into axial high-frequency chatter and radial pulsating impact, which significantly alleviates the hard impact of the axial force on the lower drill bit, thereby improving the service life of the lower drill bit.

[0037] Existing impactors increase torque through impact components, but when the drill bit gets stuck vertically, the upper energy-storing impactor 4 and the lower energy-storing impactor 7 can be added to release the drill bit vertically. After replacing them with the upper energy-storing impactor 4 and the lower energy-storing impactor 7, the spindle 2 becomes an axial floating load. When the hammer 32 impacts the spindle 2, the drill bit at the bottom is no longer subject to rigid axial constraint. The energy generated at the moment of impact induces axial chatter and radial vibration of the spindle 2. By adding the upper energy-storing impactor 4 and the lower energy-storing impactor 7, the collision energy that was originally lost on the rigid bearing is converted into radial and axial auxiliary impacts that help break rocks, giving the tool stronger penetration and higher reliability when facing deep geothermal drilling and heterogeneous formations.

[0038] By adjusting the contact surface of the impact components, impact loss is reduced and service life is extended. At the same time, the collision energy that was originally lost on the rigid bearing is converted into radial and axial auxiliary impacts that help break rocks, giving the drilling equipment stronger penetration and higher reliability when facing deep geothermal drilling and heterogeneous formations.

[0039] The present invention provides a contact boss 2401, and the arc-shaped concave teeth 2402 on the contact boss 2401 cooperate with the arc-shaped convex teeth 3201 of the punch 32 to change the planar contact between the main shaft 2 and the punch 32 into an arc-shaped contact. This can disperse the impact pressure, avoid local damage caused by planar line contact due to installation or movement errors, and prevent early chipping and peeling of metal.

[0040] By adding the upper energy storage impact component 4 and the lower energy storage impact component 7, radial impact can be supplemented. Replacing the traditional thrust bearing with a more elastic energy storage impact component is equivalent to installing an adaptive axial impact adjuster on the drill bit, so that when it encounters hard rocks, it no longer hits them head-on, but impacts the formation through high-frequency multi-directional vibration.

[0041] The energy storage spring assembly 43 redirects the hard impact caused by axial vibration, which was originally acting on the lower drill bit, to the upper energy storage impact member 4 and the lower energy storage impact member 7. This avoids directly transmitting the harmful oscillations generated during the impact to the expensive upper instruments. The upper energy storage impact member 4 and the lower energy storage impact member 7 act as mechanical filters. While transmitting the torque-increasing power, they absorb the instantaneous high-frequency peak stress generated by the collision. When the drill bit encounters an extremely hard interlayer, the drill bit vibrates violently axially. The upper energy storage impact member 4 and the lower energy storage impact member 7 drive the drill bit to retreat and buffer, which effectively prevents the cutting teeth of the drill bit from chipping and the spindle 2 from breaking. This significantly improves the mechanical environment of the lower drill bit assembly, increases the service life of the drill bit and the rock-breaking efficiency in extreme formations.

[0042] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A torque-increasing device, characterized in that: The rotary torque amplification device includes a housing (1), a main shaft (2) installed inside the housing (1), an impact cylinder (3) sleeved on the outside of the main shaft (2), a torque ring (21) provided at the connection between the main shaft (2) and the impact cylinder (3), a retaining ring (22) provided below the main shaft (2), an upper energy storage impact member (4) installed on the top of the impact cylinder (3), a pressure ring (31) installed at the bottom of the impact cylinder (3), a limit bearing (5) installed between the retaining ring (22) and the pressure ring (31), a limit bearing (5) also installed on the top of the upper energy storage impact member (4), a locking sleeve (6) installed at the bottom of the housing (1), a lower energy storage impact member (7) provided between the locking sleeve (6) and the retaining ring (22), a lower connector (23) provided at the bottom of the main shaft (2), the lower connector (23) extending out of the locking sleeve (6), and the lower connector (23) connected to the drill bit.

2. The torque-increasing device according to claim 1, characterized in that: The main shaft (2) is divided into a contact area (24) and a connection area (25) by the retaining ring (22). The contact area (24) is symmetrically provided with contact bosses (2401) on the outside. Both sides of the contact bosses (2401) are provided with arc-shaped concave teeth (2402). The torsion ring (21) is located in the gap between the contact area (24) and the impact cylinder (3).

3. The torque-increasing device according to claim 2, characterized in that: A hammer (32) is provided between the inner wall of the impact cylinder (3) and the outer side of the main shaft (2). The hammer (32) is arc-shaped, and the arc of the hammer (32) is consistent with the arc of the outer wall of the main shaft. The hammer (32) is located between the two contact bosses (2401). Arc-shaped protrusions (3201) are provided on both sides of the hammer (32). A connecting post (3202) is provided on the outer wall of the hammer (32). A connecting groove (33) is symmetrically opened on the inner wall of the impact cylinder (3).

4. The torque-increasing device according to claim 3, characterized in that: The arc-shaped concave tooth (2402) cooperates with the arc-shaped convex tooth (3201). When the hammer (32) collides with the contact boss (2401), the arc-shaped convex tooth (3201) is completely embedded in the arc-shaped concave tooth (2402).

5. The torque-increasing device according to claim 4, characterized in that: The upper energy storage impact member (4) includes a lower seat (41) and an upper seat (42) nested in the lower seat (42). An energy storage spring assembly (43) is provided between the lower seat (41) and the upper seat (42). The energy storage spring assembly (43) includes an outer spring (4301) and an inner spring (4302) with the opposite spiral direction to the outer spring (4301). Dustproof scraper rings (44) are provided on both the outer and inner sides of the upper energy storage impact member (4).

6. The torque-increasing device according to claim 5, characterized in that: The housing (1) is provided with a limiting ring (11) on the inner side, and the limiting bearing (5) is installed at the bottom of the limiting ring (11). The limiting bearing (5) is fixed by the limiting ring (11) and the upper energy storage impact member (4).

7. The torque-increasing device according to claim 6, characterized in that: The lower energy storage impact member (7) is installed between the retaining ring (22) and the locking sleeve (6). The lower energy storage impact member (7) has the same structure as the upper energy storage impact member (4), and the lower energy storage impact member (7) and the upper energy storage impact member (4) are installed in opposite directions.

8. The torque-increasing device according to claim 7, characterized in that: The top of the torsion ring (21) is provided with a transmission sleeve (8), which connects the upper energy storage impact member (4) and the limiting bearing (5).

9. A torque-increasing device according to claim 8, characterized in that: The contact surface between the connecting post (3202) and the connecting groove (33) is an arc surface, and the hammer (32) can rotate around the connecting post (3202) as the center.

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