Slurry-driven heavy-load hydraulic impact hammer capable of actively rotating and converting frequency

Abstract

The invention relates to a slurry-driven heavy-load hydraulic impact hammer capable of actively rotating and converting frequency, which comprises a torque transmission joint short section, an L-shaped upper TC bearing, an L-shaped lower TC bearing, a fixed non-rotating shell, an anchoring pin, a reversing valve sleeve, a rotating middle core shaft, a connecting shell, a piston, a lower shell, an impact hammer, an anti-falling ring, an internal spline joint short section, a hard alloy drill bit, a telescopic limiting pin and a restoring spring. The bearing is composed of an outer TC bearing, an inner TC bearing, an upper TC bearing and a lower TC bearing. According to the slurry-driven heavy-load hydraulic impact hammer capable of actively rotating and converting the frequency, the impact frequency is changed through rotation of a power drilling tool, and the impact force is changed through the displacement of drilling fluid; the impact end speed of the impact hammer can be increased, and then impact energy is increased; meanwhile, the impact frequency is improved, and the purpose of efficient rock breaking is achieved through high-frequency large impact energy.

Description

Technical Field

[0001] The invention relates to the field of petroleum and natural gas industry and mechanical engineering, and in particular to an active rotary frequency-converting mud-driven heavy-load hydraulic impact hammer. Background Art

[0002] In the field of oil and gas drilling and geothermal drilling, as the wells get deeper and deeper, the rocks get harder and harder, and the borehole size gets smaller and smaller, the mechanical energy that can be transmitted from the ground is also less and less, which leads to slower and slower drilling speeds, and finally high drilling costs. In the past 100 years of drilling in the oil and gas industry, mechanical energy is still the main rock-breaking ability of drilling, supplemented by fluid. First, high-strength downhole drilling tools and reformed processes were developed to achieve effective transmission of ground power downward; in recent decades, fluid-driven downhole power drilling tools and impact drilling tools have been studied to form auxiliary power downhole. As far as impact drilling tools are concerned, they have developed from axial impact to torsional impact and axial-torsion composite impact. There are still two major problems with existing impactors. One is that the service life is not long enough, and the other is that the impact energy is not large enough. Although it has played a great role in drilling, there is still room for further improvement.

[0003] Therefore, in order to solve the problem of insufficient impact energy of existing impactors, which is specifically manifested in the problems of small impact work and insufficient impact frequency, there is a need for an active rotating frequency-converting mud-driven heavy-duty hydraulic impact hammer that can increase the final impact velocity of the hammer, increase the impact work, increase the impact frequency, and utilize high-frequency and large impact work to achieve efficient rock breaking. Summary of the invention

[0004] The purpose of the present invention is to provide a mud-driven heavy-duty hydraulic impact hammer with active rotation frequency conversion, which can increase the final impact velocity of the hammer and thus increase the impact work; at the same time, the impact frequency is increased, and the purpose of efficient rock breaking is achieved by utilizing high frequency and large impact work.

[0005] To this end, the present invention provides a mud-driven heavy-duty hydraulic impact hammer with active rotation frequency conversion, which is composed of a torque transmission joint short section, an L-shaped upper TC bearing, an L-shaped lower TC bearing, a fixed non-rotating housing, an anchor pin, a reversing valve sleeve, a rotating central shaft, a connecting housing, a piston, a lower housing, a hammer, an anti-drop ring, an internal spline joint short section, a carbide drill bit, a telescopic limit pin, a restoring spring, an outer TC bearing, an inner TC bearing, an upper TC bearing and a lower TC bearing;

[0006] The torque transmission joint short section abuts against the L-shaped upper TC bearing, the L-shaped upper TC bearing cooperates with the L-shaped lower TC bearing to realize rotation, and the torque transmission joint short section is connected to the rotating central shaft through a tapered thread;

[0007] The L-type lower TC bearing has an interference fit with the fixed non-rotating housing, and the L-type upper TC bearing has an interference fit with the rotating central shaft; the reversing valve sleeve is fixed to the fixed non-rotating housing by anchor pins;

[0008] The rotating center shaft and the reversing valve sleeve are clearance-matched, and the two can rotate relative to each other; there are an outer TC bearing and an inner TC bearing between the fixed non-rotating outer shell;

[0009] The rotating central core shaft and the lower housing are respectively connected to the connecting housing through tapered threads;

[0010] The lower housing is connected to the internal spline joint nipple by means of a tapered thread;

[0011] The internal spline joint short section has splines inside to match the carbide drill bit; the hammer is connected to the piston through a tapered thread;

[0012] How it works:

[0013] The upper part of the torque transmission joint short section is connected to the power drill, drill pipe, etc. in sequence. The power drill provides rotational power and lowers the entire drill string to the bottom of the well to prepare for drilling;

[0014] When the ground mud pump is turned on, most of the mud reaches the inner hole of the torque transmission joint short section through the power drill, and then flows out to the center hole of the rotating central core shaft, the inner hole of the piston, the inner hole of the hammer, the inner hole of the drill bit, and the diversion hole of the drill bit in sequence; a part of the mud reaches the telescopic limit cavity surrounded by the fixed non-rotating outer shell and the rotating central core shaft through the center hole of the rotating central core shaft and the first lateral hole. At this time, the telescopic limit pin extends in a direction perpendicular to the axis of the hydraulic impact hammer, contacts the well wall, and limits the rotational movement of the fixed non-rotating outer shell;

[0015] A part of the mud reaches the return pressure chamber through the center hole of the rotating central shaft and the normal pressure through hole;

[0016] A part of the drilling fluid passes through the central hole of the rotating central shaft, the second lateral hole, the lateral hole, and the main flow hole to reach the stroke pressure chamber surrounded by the rotating central shaft, the connecting shell and the piston; according to the different positions of the rotating central shaft, the drilling fluid can also flow out through the central hole of the rotating central shaft, the second lateral hole, the lateral hole, the main flow hole, the leakage hole and the intermittent opening and closing hole;

[0017] At this time, after the drilling fluid passes through the power drill, the center shaft of the power drill will drive the torque transmission joint short section, the rotating central shaft, the connecting shell, the lower shell, the internal spline joint short section, and the carbide drill bit to rotate;

[0018] Impact stroke:

[0019] When the rotating central core shaft rotates to the point where the second lateral hole is connected to the lateral hole, the intermittent opening and closing hole and the leakage hole are not connected, and the drilling fluid passes through the central hole of the rotating central core shaft, the second lateral hole, the lateral hole, and the main flow hole to reach the stroke pressure chamber surrounded by the rotating central core shaft, the connecting shell, and the piston. The stroke pressure chamber is high pressure, and the upper step surface area of ​​the piston is larger than the lower step surface, so the piston drives the hammer to impact the drill bit;

[0020] Reply to itinerary

[0021] When the rotating central shaft rotates to the point where the second lateral hole is no longer connected to the lateral hole, the intermittent opening and closing hole is connected to the leakage hole, and the stroke pressure chamber has low pressure. At this time, the piston drives the hammer away from the drill bit. The above phenomenon will occur alternately with the rotation. The hammer periodically impacts the drill bit, and its impact frequency is controlled by the rotation speed. The hydraulic impact hammer can provide a frequency of 0-100Hz, an impact force of 1-100 tons, a working pressure of 0-10MPa, and a displacement of 10-150L / s.

[0022] The rotating central shaft is provided with a first lateral hole, a second lateral hole, a main flow hole, and a leakage hole;

[0023] The number of the first lateral holes is 1-4;

[0024] The number of the second lateral holes is the same as that of the leakage holes, which is 8-30, and the second lateral holes and the leakage holes are arranged alternately;

[0025] The number of mainstream holes is 4-12, and the ratio of their equivalent area to the central hole area ranges from 0.8-1.

[0026] The extension of the telescopic limit pins is 3-50 mm, and the number of the telescopic limit pins is 4-10, which are symmetrically distributed;

[0027] The number of restoring springs is the same as the number of telescopic limit pins.

[0028] A high temperature wear-resistant sealing ring is installed between the rotating central shaft and the fixed non-rotating outer shell, and the shape of the sealing ring is O-type or Y-type.

[0029] The anchor pins are connected to the fixed non-rotating housing via threads. The anchor pins can transmit a torque less than or equal to 100 N.m, and the number of the anchor pins is 2-20.

[0030] The fixed non-rotating housing is provided with intermittent opening and closing holes around its circumference, and the number of intermittent opening and closing holes is the same as the number of the second lateral holes and the leakage holes.

[0031] The area of ​​the upper step surface of the piston is larger than that of the lower step surface, and the area ratio of the upper step surface to the lower step surface is 1.1-2; sealing rings are arranged between the piston and the rotating central shaft and the connecting shell.

[0032] Internal spline joint nipple and carbide drill bit limit and transmit torque through spline.

[0033] The hydraulic impact hammer controls the frequency between 0-100Hz through the rotary drilling speed, the impact force is 1-100 tons, the working pressure is 0-10MPa, and the displacement is 10-150L / s;

[0034] The drill bit's diverter holes will produce different pressure drops corresponding to different flow rates, thereby achieving changes in impact force.

[0035] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention has a simple main structure, a full-diameter structure, and low medium sensitivity; (2) It adopts low-speed rotational motion to achieve high-frequency impact, thereby avoiding the contact problem of high-speed motion; (3) The present invention is applicable to existing construction technology and has low cost of use; (4) The present invention has no electronic components, is easy to operate, safe and reliable, and has strong adaptability; (5) The present invention can reduce damage to other ground equipment and reduce drilling costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the overall structure of an active rotary frequency conversion mud-driven heavy-duty hydraulic impact hammer of the present invention;

[0037] Figure 2 This is an important flow identification diagram of an active rotary frequency conversion mud-driven heavy-duty hydraulic impact hammer of the present invention;

[0038] Figure 3 It is a schematic diagram of the three-dimensional structure of the reversing valve sleeve of the present invention;

[0039] Figure 4 This is a schematic diagram of the three-dimensional structure of the rotating central shaft of the present invention;

[0040] Figure 5 It is a two-dimensional structural plane diagram of the rotating central axis of the present invention;

[0041] Figure 6 This is a schematic diagram of the piston structure of the present invention;

[0042] In the figure: 1. Torque transmission joint short section, 2. L-type upper TC bearing, 3. L-type lower TC bearing, 4. Fixed non-rotating housing, 5. Anchor pin, 6. Reversing valve sleeve, 7. Rotating central shaft, 8. Connecting housing, 9. Piston, 10. Lower housing, 11. Hammer, 12. Anti-drop ring, 13. Internal spline joint short section, 14. Carbide drill, 15. Telescopic limit pin, 16. Restoration spring, 17. External TC bearing, 18. Internal TC bearing, 19. Upper TC bearing, 20. Lower TC bearing, 21. Stroke pressure chamber, 22. Return pressure chamber, 23. Telescopic limit chamber, 41. Intermittent opening and closing lateral hole, 61. Lateral hole, 71. Center hole, 72. First lateral hole, 73. Second lateral hole, 74. Main flow hole, 75. Drain hole, 91. Normal pressure through hole, 92. Inner hole, 111. Hammer inner hole, 141. Drill bit inner hole, 142. Drill bit diversion hole. DETAILED DESCRIPTION

[0043] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0044] The specific embodiments of the present invention described herein are only used for the purpose of explaining the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible changes based on the present invention, which should be regarded as belonging to the scope of the present invention. It should be noted that when an element is referred to as "disposed on" another element, it can be directly on the other element or there can also be a central element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a central element at the same time. The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation method.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0046] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0047] See also Figures 1 to 6 The present invention provides a mud-driven heavy-duty hydraulic impact hammer with active rotation frequency conversion, which is composed of a torque transmission joint short section 1, an L-type upper TC bearing 2, an L-type lower TC bearing 3, a fixed non-rotating housing 4, an anchor pin 5, a reversing valve sleeve 6, a rotating central shaft 7, a connecting housing 8, a piston 9, a lower housing 10, a hammer 11, an anti-drop ring 12, an inner spline joint short section 13, a carbide drill bit 14, a telescopic limit pin 15, a restoring spring 16, an outer TC bearing 17, an inner TC bearing 18, an upper TC bearing 19 and a lower TC bearing 20;

[0048] The torque transmission joint short section 1 is in contact with the L-shaped upper TC bearing 2, and the L-shaped upper TC bearing 2 cooperates with the L-shaped lower TC bearing 3 to achieve rotation. The L-shaped upper TC bearing 2 and the L-shaped lower TC bearing 3 reduce the wear between the torque transmission joint short section 1, the fixed non-rotating housing 4 and the rotating central shaft 7.

[0049] There can be no relative rotation between the L-shaped upper TC bearing 2 and the rotating central shaft 7;

[0050] There can be no relative rotation between the L-shaped lower TC bearing 3 and the fixed non-rotating housing 4;

[0051] The torque transmission joint nipple 1 is connected to the rotating central shaft 7 through a tapered thread;

[0052] The L-shaped lower TC bearing 3 is interference fit with the fixed non-rotating housing 4, and the L-shaped upper TC bearing 2 is interference fit with the rotating central shaft 7;

[0053] The reversing valve sleeve 6 is fixed to the fixed non-rotating housing 4 by means of the anchor pin 5, and the two cannot rotate relative to each other at any time;

[0054] The rotating central shaft 7 and the reversing valve sleeve 6 are clearance-matched, and the two can rotate relative to each other, and there is a metal seal between the two;

[0055] There are outer TC bearing 17 and inner TC bearing 18 between the fixed non-rotating housing 4;

[0056] The rotating central shaft 7 and the lower housing 10 are respectively connected to the connecting housing 8 through tapered threads;

[0057] The lower housing 10 is connected to the internal spline joint nipple 13 via a tapered thread;

[0058] The internal spline joint short section 13 has splines inside to cooperate with the carbide drill bit 14; the hammer 11 is connected to the piston 9 through a tapered thread;

[0059] The rotating central shaft 7 is provided with a first lateral hole 72, a second lateral hole 73, a main flow hole 74, and a leakage hole 75; the number of the first lateral holes 72 is 1-4;

[0060] The number of the second lateral holes 73 and the leakage holes 75 is the same, which is 8-30, and the second lateral holes 73 and the leakage holes 75 are arranged alternately;

[0061] The number of the main flow holes 74 is 4-12, and the ratio of their equivalent areas to the area of ​​the central hole 71 is in the range of 0.8-1.

[0062] The extension amount of the telescopic limit pins 15 is 3-50 mm, and the number of the telescopic limit pins 15 is 4-10, which are symmetrically distributed;

[0063] The number of the restoring springs 16 is consistent with the number of the telescopic limiting pins 15 .

[0064] A high temperature wear-resistant sealing ring is installed between the rotating central shaft 7 and the fixed non-rotating outer shell 4, and its shape is O-type or Y-type.

[0065] The anchor pins 5 are connected to the fixed non-rotating housing 4 via threads. The anchor pins 5 can transmit a torque less than or equal to 100 N.m, and the number of the anchor pins 5 is 2-20.

[0066] The fixed non-rotating housing 4 is circumferentially provided with intermittent opening and closing holes 41 , the number of which is the same as the number of the second lateral holes 73 and the leakage holes 75 .

[0067] The area of ​​the upper step surface 93 of the piston 9 is larger than that of the lower step surface 94 , and the area ratio of the upper step surface 93 to the lower step surface 94 is 1.1-2; there are sealing rings between the piston 9 and the rotating central shaft 7 and the connecting shell 8 .

[0068] The internal spline joint short section 13 and the carbide drill bit 14 are limited and transmit torque through the spline.

[0069] The hydraulic impact hammer controls the frequency between 0-100Hz through the rotary drilling speed, the impact force is 1-100 tons, the working pressure is 0-10MPa, and the displacement is 10-150L / s;

[0070] The drill bit's diverter holes will produce different pressure drops corresponding to different flow rates, thereby achieving changes in impact force.

[0071] How it works:

[0072] The upper part of the torque transmission joint short section 1 is connected to the power drill, drill pipe, etc. in sequence. The power drill provides rotational power and lowers the entire drill string to the bottom of the well to prepare for drilling.

[0073] When the ground mud pump is turned on, most of the mud reaches the inner hole of the torque transmission joint short section 1 through the power drill, and then flows out to the center hole 71 of the rotating central core shaft 7, the inner hole 92 of the piston 9, the inner hole 111 of the hammer, the inner hole 141 of the drill bit, and the diversion hole 142 of the drill bit in sequence; a part of the mud reaches the telescopic limit cavity 23 surrounded by the fixed non-rotating outer shell 4 and the rotating central core shaft 7 through the center hole 71 of the rotating central core shaft 7 and the first lateral hole 72. At this time, the telescopic limit pin 15 extends along the direction perpendicular to the axis of the hydraulic impact hammer, contacts the well wall, and limits the rotational movement of the fixed non-rotating outer shell 4;

[0074] A portion of the mud passes through the central hole 71 of the rotating central shaft 7 and the normal pressure through hole 91 to reach the return pressure chamber 22;

[0075] A part of the drilling fluid passes through the central hole 71 of the rotating central shaft 7, the second lateral hole 73, the lateral hole 61, and the main flow hole 71 to reach the stroke pressure chamber 21 surrounded by the rotating central shaft 7, the connecting shell 8, and the piston 9; according to the different positions of the rotating central shaft 7, the drilling fluid can also flow out through the central hole 71 of the rotating central shaft 7, the second lateral hole 73, the lateral hole 61, the main flow hole 71, the leakage hole 75, and the intermittent opening and closing hole 41;

[0076] At this time, after the drilling fluid passes through the power drill, the center shaft of the power drill will drive the torque transmission joint short section 1, the rotating core shaft 7, the connecting shell 8, the lower shell 10, the internal spline joint short section 13, and the carbide drill bit 14 to rotate;

[0077] Impact stroke:

[0078] When the rotating central core shaft 7 rotates to the point where the second lateral hole 73 is connected to the lateral hole 61, the intermittent opening and closing hole 41 and the leakage hole 75 are not connected, and the drilling fluid passes through the central hole 71 of the rotating central core shaft 7, the second lateral hole 73, the lateral hole 61, and the main flow hole 71 to reach the stroke pressure chamber 21 surrounded by the rotating central core shaft 7, the connecting shell 8, and the piston 9. The stroke pressure chamber 21 is high pressure, and the area of ​​the upper step surface 93 of the piston 9 is larger than the area of ​​the lower step surface 94, so the piston 9 drives the hammer 11 to impact the drill bit downward, and the drill bit impacts the rock at the bottom of the well;

[0079] Reply itinerary:

[0080] When the rotating central shaft 7 rotates to the point where the second lateral hole 73 is no longer connected to the lateral hole 61, the intermittent opening and closing hole 41 is connected to the leakage hole 75, and the stroke pressure chamber 21 is at low pressure. At this time, the piston 9 drives the hammer 11 away from the drill bit. The above phenomenon will appear alternately with the rotation. The hammer periodically impacts the drill bit, and its impact frequency is controlled by the rotation speed. The hydraulic impact hammer can provide a frequency of 0-100Hz, an impact force of 1-100 tons, a working pressure of 0-10MPa, and a displacement of 10-150L / s.

[0081] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention has a simple main structure, a full-diameter structure, and low medium sensitivity; (2) It adopts low-speed rotational motion to achieve high-frequency impact, thereby avoiding the contact problem of high-speed motion; (3) The present invention is applicable to existing construction technology and has low cost of use; (4) The present invention has no electronic components, is easy to operate, safe and reliable, and has strong adaptability; (5) The present invention can reduce damage to other ground equipment and reduce drilling costs.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the spirit and principle of the present invention. Any modifications, equivalent substitutions, improvements, etc. made should be included in the scope of the present invention.

Claims

1. A mud-driven heavy-duty hydraulic impact hammer with active rotation frequency conversion, comprising a torque transmission joint short section (1), an L-shaped upper TC bearing (2), an L-shaped lower TC bearing (3), a fixed non-rotating housing (4), an anchor pin (5), a reversing valve sleeve (6), a rotating central shaft (7), a connecting housing (8), a piston (9), a lower housing (10), a hammer (11), an anti-drop ring (12), an inner spline joint short section (13), a carbide drill bit (14), a telescopic limit pin (15), a restoring spring (16), an outer TC bearing (17), an inner TC bearing (18), an upper TC bearing (19) and a lower TC bearing (20); characterized in that: The torque transmission joint short section (1) is in contact with the L-shaped upper TC bearing (2), and the L-shaped upper TC bearing (2) and the L-shaped lower TC bearing (3) cooperate to realize rotation. The torque transmission joint short section (1) is connected to the rotating central shaft (7) through a tapered thread; the L-shaped lower TC bearing (3) and the fixed non-rotating housing (4) are interference fit, and the L-shaped upper TC bearing (2) and the rotating central shaft (7) are interference fit; the reversing valve sleeve (6) is fixed to the fixed non-rotating housing (4) through an anchor pin (5); the rotating central shaft (7) and the reversing valve sleeve (6) are clearance fit, and the two can rotate relative to each other; there is an outer TC shaft between the fixed non-rotating housing (4) and the outer TC shaft (7). The rotary center shaft (7) and the lower housing (10) are connected to the connecting housing (8) through tapered threads respectively; the lower housing (10) is connected to the internal spline joint short section (13) through tapered threads; the internal spline joint short section (13) has splines that cooperate with the carbide drill bit (14); the hammer (11) is connected to the piston (9) through tapered threads; its working principle is: the upper part of the torque transmission joint short section (1) is connected to the power drill, the drill pipe, etc. in sequence, the power drill provides rotational power, and lowers the entire drill string to the bottom of the well to prepare for drilling; the ground mud pump is turned on, and most of the mud reaches the bottom of the well through the power drill. The inner hole of the torque transmission joint short section (1) then reaches the center hole (71) of the rotating central shaft (7), the inner hole (92) of the piston (9), the inner hole (111) of the hammer, the inner hole (141) of the drill bit, and the diversion hole (142) of the drill bit and flows out; a part of the mud passes through the center hole (71) of the rotating central shaft (7) and the first lateral hole (72) to reach the telescopic limit cavity (23) surrounded by the fixed non-rotating outer shell (4) and the rotating central shaft (7), at which time the telescopic limit pin (15) extends in a direction perpendicular to the axis of the hydraulic impact hammer and contacts the well wall, limiting the rotational movement of the fixed non-rotating outer shell (4); a part of the mud passes through the center hole (71) of the rotating central shaft (7) and the first lateral hole (72) to reach the telescopic limit cavity (23) surrounded by the fixed non-rotating outer shell (4) and the rotating central shaft (7). The drilling fluid reaches the return pressure chamber (22) through the central hole (71) and the normal pressure through hole (91) of the rotating central shaft (7); a part of the drilling fluid reaches the stroke pressure chamber (21) surrounded by the rotating central shaft (7), the connecting shell (8) and the piston (9) through the central hole (71), the second lateral hole (73), the lateral hole (61) and the main flow hole (71) of the rotating central shaft (7); according to the different positions of the rotating central shaft (7), the drilling fluid can also flow out through the central hole (71), the second lateral hole (73), the lateral hole (61), the main flow hole (71), the leakage hole (75) and the intermittent opening and closing hole (41) of the rotating central shaft (7); At this time, after the drilling fluid passes through the power drill, the central axis of the power drill will drive the torque transmission joint short section (1), the rotating central core shaft (7), the connecting shell (8), the lower shell (10), the internal spline joint short section (13), and the carbide drill bit (14) to rotate; when the rotating central core shaft (7) rotates to the point where the second lateral hole (73) is connected to the lateral hole (61), the intermittent opening and closing hole (41) and the leakage hole (75) are disconnected, and the drilling fluid passes through the central hole (71), the second lateral hole (73), the lateral hole (61), and the main flow hole (71) of the rotating central core shaft (7) to reach the stroke pressure chamber (21) surrounded by the rotating central core shaft (7), the connecting shell (8), and the piston (9). The stroke pressure chamber (21) The upper step surface (93) of the piston (9) is larger than the lower step surface (94), so the piston (9) drives the hammer (11) to impact the drill bit; when the rotating central shaft (7) rotates to the point where the second lateral hole (73) is not connected to the lateral hole (61), the intermittent opening and closing hole (41) and the leakage hole (75) are connected, and the stroke pressure chamber (21) is low-pressure. At this time, the piston (9) drives the hammer (11) away from the drill bit. As the rotation occurs, the above phenomenon will occur alternately. The hammer periodically impacts the drill bit, and its impact frequency is controlled by the rotation speed. The hydraulic impact hammer can provide a frequency of 0-100 Hz, an impact force of 1-100 tons, a working pressure of 0-10 MPa, and a displacement of 10-150 L / s.

2. The active rotary frequency conversion mud-driven heavy-duty hydraulic impact hammer according to claim 1 is characterized in that: The rotating central shaft (7) is provided with a first lateral hole (72), a second lateral hole (73), a main flow hole (74), and a leakage hole (75); the number of the first lateral holes (72) is 1-4; the number of the second lateral holes (73) and the leakage holes (75) is the same, that is, 8-30, and the second lateral holes (73) and the leakage holes (75) are arranged alternately; the number of the main flow holes (74) is 4-12, and the ratio of their equivalent area to the area of ​​the central hole (71) is in the range of 0.8-1.

3. The active rotary frequency conversion mud-driven heavy-duty hydraulic impact hammer according to claim 1 is characterized in that: The extension amount of the telescopic limit pins (15) is 3-50 mm, and the number of the telescopic limit pins (15) is 4-10 and symmetrically distributed; the number of the restoring springs (16) is consistent with the number of the telescopic limit pins (15).

4. The active rotary frequency conversion mud driven heavy-duty hydraulic impact hammer according to claim 1 is characterized in that: A high temperature wear-resistant sealing ring is installed between the rotating central shaft (7) and the fixed non-rotating outer shell (4), and its shape is O-type or Y-type.

5. The active rotary frequency conversion mud-driven heavy-duty hydraulic impact hammer according to claim 1 is characterized in that: The anchor pin (5) is connected to the fixed non-rotating housing (4) via threads. The anchor pin (5) can transmit a torque less than or equal to 100 N.m, and the number of the anchor pins (5) is 2-20.

6. The active rotary frequency conversion mud driven heavy-duty hydraulic impact hammer according to claim 1, characterized in that: The fixed non-rotating housing (4) is circumferentially provided with intermittent opening and closing holes (41), the number of which is the same as the number of the second lateral holes (73) and the leakage holes (75).

7. The active rotary frequency conversion mud driven heavy-duty hydraulic impact hammer according to claim 1, characterized in that: The area of ​​the upper step surface (93) of the piston (9) is larger than that of the lower step surface (94), and the area ratio of the upper step surface (93) to the lower step surface (94) is 1.1-2; There are sealing rings between the piston (9), the rotating central shaft (7) and the connecting shell (8).

8. The active rotary frequency conversion mud-driven heavy-duty hydraulic impact hammer according to claim 1, characterized in that: The internal spline joint short section (13) and the carbide drill bit (14) are limited and torque is transmitted through the spline.

9. The active rotary frequency conversion mud-driven heavy-duty hydraulic impact hammer according to claim 1, characterized in that: The hydraulic impact hammer controls the frequency between 0-100Hz through the rotation drilling speed, with an impact force of 1-100 tons, a working pressure of 0-10MPa, and a displacement of 10-150L / s; the drill bit diverter hole will produce different pressure drops corresponding to different flow rates, thereby achieving changes in impact force.

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