CN114136673A - Full-size myriawatt-level laser auxiliary mechanical rock breaking test bed - Google Patents
Full-size myriawatt-level laser auxiliary mechanical rock breaking test bed Download PDFInfo
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- CN114136673A CN114136673A CN202111349367.0A CN202111349367A CN114136673A CN 114136673 A CN114136673 A CN 114136673A CN 202111349367 A CN202111349367 A CN 202111349367A CN 114136673 A CN114136673 A CN 114136673A
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- 239000011435 rock Substances 0.000 title claims abstract description 89
- 238000012360 testing method Methods 0.000 title claims abstract description 61
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 15
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 7
- 238000007493 shaping process Methods 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 24
- 230000008569 process Effects 0.000 claims description 19
- 239000013307 optical fiber Substances 0.000 claims description 10
- 230000003287 optical effect Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 16
- 238000006073 displacement reaction Methods 0.000 abstract description 9
- 230000001737 promoting effect Effects 0.000 abstract 1
- 238000005553 drilling Methods 0.000 description 20
- 230000008878 coupling Effects 0.000 description 12
- 238000010168 coupling process Methods 0.000 description 12
- 238000005859 coupling reaction Methods 0.000 description 12
- 238000011161 development Methods 0.000 description 11
- 239000003921 oil Substances 0.000 description 9
- 229910001208 Crucible steel Inorganic materials 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/005—Testing of complete machines, e.g. washing-machines or mobile phones
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/08—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B44/00—Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions
Abstract
The invention relates to a full-size myriawatt-level laser auxiliary mechanical rock breaking test bed which mainly comprises a rotating system, a bit pressure loading system, a light path system, a gas path system, a testing system, a rock sample moving and transporting system, a rock sample clamping system and a rack. The rotating system mainly comprises a variable frequency motor, a single-stage gear reducer and a turntable; the bit weight loading system mainly comprises a hydraulic oil cylinder and a loading platform; the light path system mainly comprises a laser generating cabinet and a myriawatt-level laser head; the air path system mainly comprises an air compressor and a one-way valve disc; the test system mainly comprises a torque and rotation speed sensor, a spoke type pressure sensor and a linear displacement sensor; the rock sample transferring system mainly comprises a lifting guide vehicle and a rock sample transferring clamp; the frame mainly comprises an upper frame and a lower frame. The invention can carry out a full-size laser-mechanical combined rock breaking test and has important significance for promoting the practical application of the laser-mechanical combined rock breaking technology.
Description
Technical Field
The invention relates to the field of new technology and new method of oil and gas drilling, in particular to the technical field of laser-mechanical combined rock breaking.
Background
In the exploitation process of oil and gas resources, drilling is one of the necessary steps for developing the oil and gas resources, and the cost of the drilling process accounts for more than half of the development cost of the whole oil and gas field. At present, the onshore oil and gas resources on shallow layers and middle layers which are easy to be exploited are basically exploited, and the development of deep layer and ultra-deep layer oil and gas resources becomes a necessary trend for the development of the petroleum industry. In the drilling process for developing deep and ultra-deep oil and gas resources, because deep rock has the characteristics of high hardness, compact lithology and strong abrasiveness, the rotary mechanical drilling method widely used at present has the problems of slow drilling, immovable drilling, serious abrasion of a drill bit, frequent tripping and the like, increases the exploitation cost of oil and gas, hinders the pace of fully developing the deep and ultra-deep oil and gas resources, and the current petroleum industry urgently needs an efficient rock breaking method suitable for the deep compact rock. In response to this problem, scholars at home and abroad have proposed a large number of new drilling techniques, including laser rock breaking techniques.
At present, laser drilling is still fashionable and used completely in the drilling field, and the main research direction of researchers at home and abroad is focused on the laser-mechanical combined rock breaking technology. The laser-mechanical combined rock breaking technology is a technology that laser is introduced into a mechanical drill bit, the rock on the drilling surface is irradiated by the laser, the strength of the rock is weakened, and then the mechanical drill bit is used for breaking the rock on the drilling surface. Compared with the rotary mechanical rock breaking technology, the laser-mechanical combined rock breaking technology has the advantages of low drilling pressure, high drilling speed, capability of drilling hard rock and capability of improving the well wall environment, and has very wide application prospect. In the field of drilling technology, full-scale tests play an important role in connecting laboratory tests with field practical application, and are a stage which must be passed through in the development process of a new drilling technology. However, at present, the research field of the laser-mechanical combined rock breaking technology lacks a full-size test bed, and the development of the laser-mechanical combined rock breaking technology is hindered to a certain extent.
In order to promote the development of a laser-mechanical combined rock breaking technology and promote the application of the laser-mechanical combined rock breaking technology to the field of production practice, a set of full-size ten-kilowatt-level laser auxiliary rock breaking test bed is designed.
Disclosure of Invention
In order to meet the requirement of a full-size test in the development process of a laser-mechanical combined rock breaking technology, promote the development of the technology and promote the application of the technology to the field of engineering practice, the invention provides a full-size myriawatt-level laser auxiliary mechanical rock breaking test bed.
The technical scheme adopted by the invention is as follows: a full-size myriawatt-level laser auxiliary mechanical rock breaking test bed mainly comprises a rotating system, a bit pressure loading system, a light path system, a gas path system, a testing system, a rock sample moving and transporting system, a rock sample clamping system and a rack.
The rotating system comprises a variable frequency motor, a small tire coupler, a single-stage gear reducer, a large tire coupler, a flange coupler and a rotary table, wherein the variable frequency motor, the single-stage gear reducer and the rotary table are fixed on the lower rack through bolts; a pair of meshed bevel gears is arranged in the rotary table, so that the functions of reducing the rotating speed, increasing the torque and changing the direction of the rotary motion are realized; furthermore, a large bevel gear ring in the turntable is fixed on the output shaft of the turntable in an interference connection mode, so that the height of the turntable is reduced, and the connection reliability is ensured; the turntable shell is cast by cast steel and can bear complex load in the test process.
The drilling pressure loading system comprises a hydraulic oil cylinder, a connecting cage, a loading platform, a skid guide rail, a hydraulic station and a drill string, wherein the hydraulic oil cylinder is fixed at the top of an upper frame, the connecting cage is fixed at the tail end of a cylinder rod of the hydraulic oil cylinder through a pin, the loading platform is connected with the connecting cage through a bolt, is fixed on the skid in a test process and moves along the skid guide rail, the drill string is ensured to move along the vertical direction all the time in the test process, the drill string is fixed below the loading platform through conical threads, and the hydraulic station can control the lifting speed of the drill string and adjust the maximum drilling pressure; furthermore, the upper part of the connecting cage is provided with a connecting hole for the pin to pass through, the side surface of the connecting cage is provided with an opening for facilitating the optical fiber to enter the drill column, and the bottom of the connecting cage is provided with a bolt hole for the connecting bolt to pass through.
The light path system consists of a laser generating cabinet, optical fibers, a myriawatt-level laser head, a linear motor, a motor placing disc, a shaping lens group sleeve, an end lens group sleeve and a laser-mechanical drill bit; the laser-mechanical drill bit is fixed at the tail end of the drill column, and a laser beam after shaping and adjustment is emitted from a light-transmitting groove in the drill column; furthermore, the motor placing plate is provided with air vents, and the outer side of the shaping lens group sleeve is provided with cooling fins, so that overheating of the shaping lens group in the test development process can be avoided.
The gas path system consists of an air compressor, an air supply pipe and a one-way valve disc; wherein the one-way valve disc is fixed inside the drill string through a screw, and the one-way valve is arranged in the one-way valve disc, so that rock debris generated in the rock breaking test process can be prevented from entering the drill string.
The test system comprises a torque rotating speed sensor, a spoke type pressure sensor and a linear displacement sensor, wherein the torque rotating speed sensor is fixed on a platform of the lower rack, two ends of a shaft are respectively connected with a single-stage gear coupler and a turntable through a large tire coupler and a flange coupler, the spoke type pressure sensor is located between a drill column and a connecting cage, one end of the linear displacement sensor is fixed on the top end of the upper rack, and the other end of the linear displacement sensor is connected with an extension part of the loading platform.
The rock sample moving system comprises a guide rail, a lifting guide trolley and a rock sample moving clamp, wherein the lifting guide trolley can move along the guide rail, and the rock sample moving clamp is connected with the rock sample moving clamp through a hoisting chain to lift a test rock sample.
The rock sample clamping system comprises a clamping screw and a rock sample bearing disc, wherein the rock sample bearing disc is fixed on the output shaft of the rotary table.
The frame comprises an upper frame, a lower frame, an operating platform and an escalator, wherein the upper frame is connected with the lower frame through bolts.
The invention has the advantages that:
1. the full-size myriawatt-level laser-assisted rock breaking test bed can be used for carrying out a full-size rock breaking test and a laser-mechanical combined rock breaking test.
2. The optical path system and the air path system are arranged in the fixed drill rod in a coupling mode, so that the number of movable parts is small, the space is compact, and the reliability of the test is ensured; the weight-on-bit loading system achieves the purpose of introducing laser into a drill string through a connecting cage structure.
3. The shaping mirror group and the end face mirror group which are arranged in the drill column and have the distance adjusted through the linear motor are designed, the purpose of shaping and adjusting laser spots is achieved, the operation of disassembling and replacing the shaping mirror group for adjusting the size of the spots is avoided, and the test period is shortened.
4. The rock sample moving and transporting system of the test bed accelerates the replacement speed of the tested rock sample in the test development process and saves the physical consumption of testing personnel in the rock sample moving and transporting process; the frame of the test bench is provided with the escalator and the operating platform, so that the tester can conveniently overhaul and debug the large-scale test equipment.
Drawings
FIG. 1 and FIG. 2 are general views of a full-scale ten-kilowatt-level laser-assisted mechanical rock breaking test bed according to the present invention;
FIG. 3 is a side view of a full-scale ten-kilowatt-class laser-assisted mechanical rock breaking test bed according to the present invention;
FIG. 4 is a front view of a full-scale ten-kilowatt-level laser-assisted mechanical rock breaking test bed according to the present invention;
FIG. 5 is a partial enlarged view of the I position in FIG. 3 of a full-scale ten-kilowatt-level laser-assisted mechanical rock breaking test bed according to the present invention;
FIG. 6 is a partial enlarged view of the second part of the FIG. 3 of a full-scale ten-kilowatt-level laser-assisted mechanical rock breaking test bed according to the present invention;
FIG. 7 is a partial enlarged view of part III of a full-scale ten-kilowatt-class laser-assisted mechanical rock breaking test bed of the present invention shown in FIG. 4;
FIG. 8 is a schematic diagram of a connecting cage part in a full-size ten-kilowatt-level laser-assisted mechanical rock breaking experimental bench;
FIG. 9 is a partial enlarged view of the area IV of a full-scale ten-kilowatt-class laser-assisted mechanical rock breaking test bed of the present invention.
In the figure: 1. a variable frequency motor; 2. a small tire coupling; 3. a single stage gear reducer; 4. a large tire coupling; 5. a flange coupling; 6. a turntable; 601. a turntable output shaft; 602. a large bevel gear ring; 603. a turntable housing; 7. a hydraulic cylinder; 8. connecting a cage; 801. connecting holes; 802. an opening; 803. bolt holes; 804. a central through hole; 9. loading a platform; 10. a skid guide rail; 11. a hydraulic station; 12. a drill string; 13. a laser generating cabinet; 14. an optical fiber; 15. a myriawatt grade laser head; 16. a linear motor; 17. a motor placing tray; 18. a shaping lens group; 19. a shaping mirror set; 20. an end lens group; 21. an end mirror stack; 22. laser-mechanical drill bits; 23. an air compressor; 24. a gas supply pipe; 25. a one-way valve disc; 26. a torque and rotation speed sensor; 27. a spoke-type pressure sensor; 28. a linear displacement sensor; 29. a guide rail; 30. a hoisting guide vehicle; 31. a rock sample transferring clamp; 32. clamping the screw rod; 33. a rock sample carrying disc; 34. an upper frame; 35. a lower frame; 36. an operating platform; 37. an escalator; 38. an air flow path.
Detailed Description
The present invention will be further described with reference to the following embodiments in conjunction with the accompanying drawings.
The invention relates to a full-size myriawatt-level laser auxiliary mechanical rock breaking test bed which mainly comprises a rotating system, a bit pressure loading system, a light path system, a gas path system, a testing system, a rock sample moving and transporting system, a rock sample clamping system and a rack.
As shown in fig. 3, 5 and 6, the rotating system is composed of a variable frequency motor 1, a small tire coupling 2, a single-stage gear reducer 3, a large tire coupling 4, a flange coupling 5 and a turntable 6, wherein the variable frequency motor 1, the single-stage gear reducer 3 and the turntable 6 are fixed on a lower frame 35 through bolts, an output shaft of the variable frequency motor 1 is connected with an input shaft of the single-stage gear reducer 3 through the small tire coupling 3, an output shaft of the single-stage gear reducer 3 is connected with an input shaft of a torque and speed sensor 26 through the large tire coupling 4, an output shaft of the torque and speed sensor 25 is connected with an input shaft of the turntable 5 through the flange coupling 4, the impact of the tire coupling in the rock breaking process is reduced, the impact on the single-stage gear reducer 3 and the variable frequency motor 1 is reduced, and the flange coupling 5 ensures the accuracy of the measurement of the rotating speed and torque; a pair of meshed bevel gears is arranged in the rotary table 6, so that the functions of reducing the rotating speed, increasing the torque and changing the direction of the rotary motion are realized; furthermore, the large bevel gear ring 602 in the turntable 6 is fixed on the turntable output shaft 601 in an interference connection mode, so that the height of the turntable 6 is reduced, and the connection reliability is ensured; the turntable housing 603 is cast from cast steel and can withstand complex loads during testing.
As shown in fig. 1, 3, 4, 7 and 8, the weight-on-bit loading system comprises a hydraulic cylinder 7, a connecting cage 8, a loading platform 9, a skid guide rail 10, a hydraulic station 11 and a drill string 12, wherein the hydraulic cylinder 7 is fixed at the top of an upper frame 34, the connecting cage 8 is fixed at the tail end of a cylinder rod of the hydraulic cylinder 7 through a pin, the loading platform 9 is connected with the connecting cage 8 through a bolt, is fixed on a skid in a test process and moves along the skid guide rail 10, so that the drill string 12 is ensured to move in the vertical direction all the time in the test process, the drill string 12 is fixed below the loading platform 9 through a conical thread, and the hydraulic station 11 can control the lifting speed of the drill string 12 and adjust the maximum weight-on-bit; further, the upper part of the connection cage 8 is provided with a connection hole 801 for the pin to pass through, the side surface is provided with an opening 802 for facilitating the optical fiber 14 to enter the drill string 12, and the bottom part is provided with a bolt hole 803 for the connection bolt to pass through and a central through hole 804 for the optical fiber 14 to enter the drill string 12.
As shown in fig. 1, 2, 4 and 9, the optical path system comprises a laser generating cabinet 13, an optical fiber 14, a myriawatt-level laser head 15, a linear motor 16, a motor placing disc 17, a shaping mirror group 18, a shaping mirror group 19, an end mirror group 20, an end mirror group 21 and a laser-mechanical drill bit 22, wherein the motor placing disc 17 is fixed on a flange at the inner side of a drill string 12, the linear motor 16 is fixed on the motor placing disc 17 through screws, the linear motor 16 is connected with the shaping mirror group 19 in a downward way, the shaping mirror group 18 is fixed inside the shaping mirror group 19, a circular light spot output by the myriawatt-level laser head 15 can be shaped into a rectangular light spot, the end face 20 is fixed in the end mirror group 21, the end mirror group 21 is fixed on a one-way valve disc 25, and the adjustment of the size of the emergent light spot can be realized by adjusting the distance between the end mirror group 20 and the shaping mirror group 21 through the linear motor 16, a laser-mechanical drill bit 22 is fixed at the tail end of the drill string 12, and the shaped and adjusted laser beam is emitted from a light-transmitting groove in the drill string; furthermore, the motor placing plate 17 is provided with vent holes, and the outer side of the shaping lens group sleeve 19 is provided with cooling fins, so that overheating of the shaping lens group 18 in the test development process can be avoided.
As shown in fig. 1 and 9, the gas circuit system is composed of an air compressor 23, an air supply pipe 24 and a one-way valve disc 25, wherein the one-way valve disc 25 is fixed inside the drill string 12 through screws, a one-way valve is arranged in the one-way valve disc 25, so that rock debris generated in a rock breaking test process can be prevented from entering the inside of the drill string 12, and an air flow in the drill string in the test process flows along a direction shown by an air flow path 38.
As shown in fig. 4, 5 and 7, the testing system comprises a torque and rotation speed sensor 26, a spoke type pressure sensor 27 and a linear displacement sensor 28, wherein the torque and rotation speed sensor 26 is fixed on a platform of a lower frame 35, two ends of a shaft are respectively connected with the single-stage gear reducer 3 and the rotary table 6 through a large tyre coupler 4 and a flange coupler 5, the spoke type pressure sensor 27 is positioned between the drill string 12 and the connecting cage 8, one end of the linear displacement sensor 28 is fixed on the top end of an upper frame 34, and the other end of the linear displacement sensor is connected with an extension part of the loading platform 9.
As shown in fig. 1, the rock sample transferring system comprises a guide rail 29, a lifting guide trolley 30 and a rock sample transferring clamp 31, wherein the lifting guide trolley 30 can move along the guide rail 29, and the rock sample transferring clamp 31 is connected with a hoisting chain to lift a test rock sample.
As shown in fig. 2, the rock sample clamping system comprises a clamping screw 32 and a rock sample carrying disc 33, wherein the rock sample carrying disc 33 is fixed on a turntable output shaft 601.
As shown in fig. 1, the machine frame includes an upper frame 34, a lower frame 35, an operation platform 36 and an escalator 37, wherein the upper frame 34 and the lower frame 35 are connected by bolts.
The invention relates to a full-size myriawatt-level laser auxiliary mechanical rock breaking test bed, which has the working principle that:
before the test starts, the lifting guide vehicle 30 moves along the guide rail 29, the rock sample conveying clamp 31 clamping the rock sample is driven by the lifting chain, the rock sample is conveyed to the rock sample bearing disc 33, the clamping screw 32 on the rock sample bearing disc 33 clamps the rock sample, and test preparation is carried out.
When the test starts, the variable frequency motor 1 is started to drive the small tire coupler 2, the single-stage gear reducer 3, the large tire coupler 4, the flange coupler 5 and the turntable 6 in sequence to drive the rock sample to rotate, and meanwhile, the hydraulic station 11 is opened to control the drill stem 12 to be quickly lowered.
When the laser-mechanical drill bit 22 is close to a rock sample, the hydraulic station 11 controls the drill string 12 to be slowly lowered, the air compressor 23 and the laser generating cabinet 13 are opened, air flow enters the drill string 12 through the air supply pipe 24, passes through the motor placing disc 17 along the direction shown by the air flow path 38, flows through the one-way valve disc 25, and flows out of the air vent and the light through groove of the laser-mechanical drill bit 22; laser enters the drill string 12 from the opening on the side surface of the connecting cage 8 through the optical fiber 14, is emitted from the myriawatt-level laser head 15, is shaped by the shaping lens group 18 and the end surface lens group 20, and forms a rectangular light spot with a proper size to irradiate on a rock sample through a light through groove of the laser-mechanical drill bit 22.
When a full-size laser-mechanical combined rock breaking test is carried out, the spoke type pressure sensor 27, the torque and rotating speed sensor 26 and the linear displacement sensor 28 can measure the bit pressure, the torque, the rotating speed and the drilling speed in the test in real time. After the test is finished, the laser generation cabinet 13 and the variable frequency motor 1 are closed firstly, then the air compressor 23 is closed, the drill string 12 is controlled to retract quickly through the hydraulic station 11, the clamping screw 32 is loosened, the hoisting guide trolley 30 drives the rock sample transport clamp 31 which clamps the tested rock sample to leave the test bed, and the test is finished.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (3)
1. The utility model provides a broken rock test bench of ten thousand watts of grades of laser-assisted machines of full-size which characterized in that: the device mainly comprises a rotating system, a bit pressure loading system, a light path system, a gas path system, a testing system, a rock sample moving and transporting system, a rock sample clamping system and a rack; the optical path system comprises a laser generation cabinet (13), an optical fiber (14), a myriawatt-level laser head (15), a linear motor (16), a motor placing disc (17), a shaping mirror group (18), a shaping mirror group sleeve (19), an end face mirror group (20), an end face mirror group sleeve (21) and a laser-mechanical drill bit (22), wherein the motor placing disc (17) is fixed on a flange on the inner side of a drill string (12), the linear motor (16) is fixed on the motor placing disc (17) through screws, the shaping mirror group sleeve (19) is connected below the linear motor (16), the shaping mirror group (18) is fixed inside the shaping mirror group sleeve (19), the end face mirror group (20) is fixed in the end face mirror group sleeve (21), the end face mirror group sleeve (21) is fixed on a one-way valve disc (25), and the laser-mechanical drill bit (22) is fixed at the tail end of the drill string (12); furthermore, a vent hole is formed in the motor placing disc (17), a radiating fin is arranged on the outer side of the shaping lens group sleeve (19), and the distance between the end surface lens group (20) and the shaping lens group (18) can be adjusted through the linear motor (16).
2. The full-size myriawatt-level laser-assisted mechanical rock breaking test bed according to claim 1, wherein: the rotating system is composed of a variable frequency motor (1), a small tire coupler (2), a single-stage gear reducer (3), a large tire coupler (4), a flange coupler (5) and a rotary table (6), wherein the variable frequency motor (1), the single-stage gear reducer (3) and the rotary table (6) are fixed on a lower rack (35) through bolts, an output shaft of the variable frequency motor (1) is connected with an input shaft of the single-stage gear reducer (4) through the small tire coupler (2), an output shaft of the single-stage gear reducer (4) is connected with an input shaft of a torque and speed sensor (26) through the large tire coupler (4), and an output shaft of the torque and speed sensor (26) is connected with the input shaft of the rotary table (6) through the flange coupler (5); a pair of meshed bevel gears is arranged in the rotary table (6); furthermore, a large bevel gear ring (602) in the rotary table (6) is fixed on the rotary table output shaft (601) in an interference connection mode.
3. The full-size myriawatt-level laser-assisted mechanical rock breaking test bed according to claim 1, wherein: the bit pressure loading system comprises a hydraulic oil cylinder (7), a connecting cage (8), a loading platform (9), a skid guide rail (10), a hydraulic station (11) and a drill string (12), wherein the hydraulic oil cylinder (7) is fixed at the top of an upper rack (34), the connecting cage (8) is fixed at the tail end of a cylinder rod of the hydraulic oil cylinder (7) through a pin, the loading platform (9) is connected with the connecting cage (8) through a bolt and moves along the skid guide rail (10) in the test process, and the drill string (12) is connected below the loading platform (9) through a conical thread; furthermore, the upper part of the connecting cage (8) is provided with a connecting hole (801) for a pin to pass through, the side surface is provided with an opening (802) for facilitating the optical fiber (14) to enter the drill string (12), and the bottom part is provided with a bolt hole (803) for a connecting bolt to pass through and a central through hole (804) for the optical fiber to enter the drill string (12).
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