Rock breaking device for simulating motion trail of hobbing cutter

Abstract

The invention relates to a rock breaking device for simulating the motion trail of a hobbing cutter, and belongs to the technical field of rock breaking, the rock breaking device comprises a drilling machine frame, and a rotary power unit and a drilling rod assembly which are arranged on the drilling machine frame, and the drilling rod assembly comprises two adjusting supports which are arranged at the ends of output shafts of the rotary power unit respectively; one end of each adjusting support is hinged to an output shaft of the rotary power unit, the two tool bases are arranged at the other ends of the two adjusting supports in a one-to-one correspondence mode, and a plurality of inserted teeth are fixedly arranged at the bottoms of the tool bases. And then the rotary power unit on the drilling machine frame is used for driving the inserted teeth to move to break rocks, so that the rock breaking effects of the whole hobbing cutter of different types under various working conditions are simulated by using a limited number of inserted teeth movement tracks, and compared with a full-size hobbing cutter, the large load does not need to be provided, a plurality of full-size hobbing cutters do not need to be machined, and the machining efficiency is improved. Therefore, the cost of the hob rock breaking test is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of rock breaking, and particularly relates to a rock breaking device for simulating the movement trajectory of a hob. Background Art

[0003] Currently, most existing hob simulation tests use a hob to break rocks. However, when using a whole hob for rock breaking tests, not only a large load needs to be provided, but also since a hob of one size can only simulate one type of tool for rock breaking tests, if it is necessary to study the rock breaking mechanism and law of the hob, multiple full-size hobs need to be processed, resulting in a relatively high cost for hob rock breaking tests. Summary of the Invention

[0004] In view of this, the present invention provides a rock breaking device for simulating the movement trajectory of a hob, so as to solve the deficiencies in the prior art. The present invention does not require a large load to be provided and does not need to process multiple full-size hobs, reducing the cost of hob rock breaking tests.

[0005] The technical solution of the present invention is: a rock breaking device for simulating the movement trajectory of a hob, including a drilling rig frame, a rotary power unit provided on the drilling rig frame, and a drill pipe assembly. The rotary power unit is fixed on the drilling rig frame. The drill pipe assembly includes two adjusting brackets respectively arranged at the end of the output shaft of the rotary power unit. One end of the adjusting bracket is hinged to the output shaft of the rotary power unit, and the hinge axis is horizontally arranged. After adjusting the angle of the adjusting bracket, it is locked by a fastener. Two tool bases are correspondingly arranged at the other ends of the two adjusting brackets. The tool base is hinged to the adjusting bracket, and the center lines of the hinge axes at both ends of the adjusting bracket are parallel to each other. After adjusting the angle of the tool base, it is locked by a fastener. A plurality of inserted teeth are fixedly provided at the bottom of the tool base.

[0006] Preferably, a transverse adjusting beam is horizontally arranged between the two adjusting brackets, and the transverse adjusting beam is detachably and fixedly connected to the two adjusting brackets respectively.

[0007] Preferably, an inserted tooth slot is provided at the bottom of the tool base, a rolling shaft is arranged in the inserted tooth slot and is rotationally connected thereto. The rolling shaft is parallel to the center line of the hinge axis. The inserted teeth are radially arranged on the inserted tooth slot along the radial direction of the rolling shaft, and the tail of the inserted tooth is fixedly connected to the rolling shaft.

[0008] Preferably, a ratchet wheel is fixedly sleeved on the rolling shaft, and a reverse stop pin is hinged on the inner wall of the inserted tooth slot. The reverse stop pin is in cooperation connection with the ratchet wheel.

[0009] Preferably, it further includes: a loading bin, which is fixedly arranged at the bottom of the drilling rig frame. Rock sample blocks are placed in the loading bin. The rotary power unit is located directly above the loading bin, and its output shaft extends vertically into the loading bin. A top pressure ring is vertically arranged directly above the rock sample block. One end of the top pressure ring abuts against the rock sample block, and the other end is fixedly connected to the loading bin.

[0010] Preferably, there is an annular gap between the periphery of the rock sample block and the side wall of the loading bin. A confining pressure water inlet pipe penetrates through the upper side of the loading bin and communicates with its interior. The top of the loading bin is provided with a top cover plate and is fixedly and sealingly connected. The output shaft of the rotary power unit passes through the top cover plate and is rotationally and sealingly connected thereto.

[0011] Preferably, an inner drill pipe is coaxially and fixedly arranged at the end of the output shaft of the rotary power unit. The inner drill pipe passes through the top cover plate and extends into the loading bin. An outer casing is coaxially sleeved on the inner drill pipe and is rotationally and sealingly connected thereto. The outer casing passes through the top cover plate and is fixedly and sealingly connected thereto.

[0012] Preferably, an axial pressure water inlet pipe penetrates through the bottom of the loading bin and communicates with its interior. The rock sample block is located directly above the outlet of the axial pressure water inlet pipe.

[0013] Preferably, an axial pressure piston is arranged between the outlet of the axial pressure water inlet pipe and the rock sample block. The axial pressure piston is slidably and sealingly connected to the loading bin along its axial direction.

[0014] Preferably, a load cell is fixedly arranged on the output shaft of the rotary power unit, and a strain gauge sensor is fixedly arranged on the insert tooth.

[0015] Compared with the prior art, a rock breaking device for simulating the movement trajectory of a hob provided by the present invention can adjust the spacing and angle of the insert teeth through the adjusting bracket and the tool base of the drill pipe assembly, and then drive the insert teeth to move for rock breaking by the rotary power unit on the drilling rig frame, so as to realize simulating the rock breaking effect of a whole hob of different types with the movement trajectories of a limited number of insert teeth. Compared with a full-size hob, it does not need to provide a large load, and does not need to machine multiple full-size hobs, thereby reducing the cost of the hob rock breaking test. Description of the Drawings

[0016] Figure 1 is a schematic diagram of single-ring cutter tooth rock breaking; Figure 2 is a schematic diagram of single cutter tooth rock breaking; Figure 3 is an arrangement diagram of a cutter head; Figure 4 is another arrangement diagram of a cutter head; Figure 5 is the overall structure diagram of the rock breaking device of the present invention; Figure 6It is the top view of the top pressing ring of the present invention; Figure 7 It is the structural schematic diagram of the drill pipe assembly of the present invention; Figure 8 It is the structural schematic diagram of a single tooth on the tool base of the present invention; Figure 9 It is the structural schematic diagram of a double tooth on the tool base of the present invention; Figure 10 It is the structural schematic diagram of a triple tooth on the tool base of the present invention; Figure 11 It is the schematic diagram of the installation of the rock sample test block of the present invention. Detailed implementation manners

[0017] The present invention provides a rock-breaking device for simulating the movement trajectory of a hob. The following will be described in conjunction with Figures 1 to 11 the structural schematic diagram of the present invention.

[0018] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the technical solutions of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0019] Currently, most existing hob simulation tests use hobs to break rocks. However, when using a whole hob for rock-breaking tests, not only a large load needs to be provided, but also since a hob of one size can only simulate one type of tool for rock-breaking tests. As Figure 3 shown, there are six center cutters and two insert cutters on the cutter head 102. As Figure 4 shown, there are four center cutters and four insert cutters on the cutter head 102. The spacing between the tools on the cutter head 102 is not the same, and the tools are not distributed along the generatrix direction of the hob conical surface and have different phase differences. If it is necessary to study the rock-breaking mechanism and law of the hob, multiple full-size hobs need to be processed, resulting in a high cost for the hob rock-breaking test.

[0020] Based on the above problems, the present application studies the mechanism of hob rock-breaking. As Figure 1 shown, for a single row of hobs, the number of cutting teeth 101 that drill rock at the same time is limited. A reference system can be selected with a rock sample of unit volume, and it is not necessary to provide a large piece of rock required for the whole hob to break rock. As Figure 2As shown in the figure, the rock-breaking process of the same cutter tooth 101 consists of three dynamic processes: contact, intrusion, and departure. It is necessary to conduct more detailed research on the influence of different states of the inserted tooth on rock fragmentation. For the rock-breaking process of the inserted-tooth hob, for a unit volume of rock, the cutter tooth periodically repeats the three states of contact, intrusion, and departure.

[0021] As Figure 3 , 4 It can be seen that the spacing between the cutters on the cutter head is not the same, and the cutters are not distributed along the generatrix direction of the hob conical surface, with different phase differences. Under the condition of taking a unit volume of rock as the reference system, this phase difference can be converted into a time difference for the inserted tooth to drill the rock (that is, different inserted teeth drill the rock successively).

[0022] The rock-breaking of the hob is achieved by the periodic rolling pressure of the cutter teeth on the hob. Therefore, if it is necessary to study the rock-breaking mechanism and law of the inserted-tooth hob, it is not necessary to design a complete cutter for linear cutting and rotary cutting tests like a traditional test platform. Only by selecting a certain number of inserted teeth to simulate the motion trajectories of the center cutter, positive cutter, and side cutter in the linear and rotary motion modes can the virtual destruction process of the inserted-tooth hob on the rock mass be realized.

[0023] Figure 5 This is the overall structure diagram of the rock-breaking device of this embodiment. As Figure 5 shown, this embodiment discloses a rock-breaking device for simulating the motion trajectory of a hob, including a drilling rig frame, a rotary power unit 3 provided on the drilling rig frame, and a drill pipe assembly. The rotary power unit 3 is fixed on the drilling rig frame. Figure 7 This is the structural schematic diagram of the drill pipe assembly of this embodiment. As Figure 7 shown, the drill pipe assembly includes two adjusting brackets 4 respectively arranged at the end of the output shaft of the rotary power unit 3. One end of the adjusting bracket 4 is hinged to the output shaft of the rotary power unit 3, and the hinge axis is horizontally arranged. After adjusting the angle of the adjusting bracket 4, it is locked by a fastener. Two cutter bases 5 are correspondingly arranged at the other ends of the two adjusting brackets 4. The cutter base 5 is hinged to the adjusting bracket 4, and the center lines of the hinge axes at both ends of the adjusting bracket 4 are parallel to each other. After adjusting the angle of the cutter base 5, it is locked by a fastener. A plurality of inserted teeth 6 are fixedly arranged at the bottom of the cutter base 5.

[0024] In this embodiment, a rotary power unit on the drilling rig frame drives the insert teeth to move for rock breaking. The rock breaking effect of the entire hob is simulated by using the movement trajectories of a limited number of insert teeth to replace the rock drilling trajectories of unit volume of rock within the rotation cycle of the hob. Meanwhile, during the dynamic rock breaking process of the insert teeth, the spacing, angle, and penetration load of the insert teeth can be adjusted by changing the angles of the adjusting bracket and the tool base, and the rotation speed of the rotary power unit. Thus, the rock breaking tests of different types of hobs under various working conditions can be simulated. Compared with full-size hobs, it does not require a large load to be provided, does not need to machine multiple full-size hobs, reduces the cost of the hob rock breaking test, and improves the effect of the hob simulation test.

[0025] The rock breaking device in this embodiment simulates the process of a full-size hob reciprocatingly drilling rock on a unit area of rock by controlling the movement trajectory of the insert teeth. Its advantages are that, compared with intrusion rock breaking equipment, it can realize the dynamic rock breaking process of the drill teeth, and can simulate the rock breaking tests of different types of hobs under various working conditions by changing the angle, speed, and penetration load. Compared with full-size hobs, it has lower requirements for the penetration load and does not need to machine multiple full-size hob models, which not only saves the test cost but also increases the types of test tool simulations.

[0026] In this embodiment, a first angle adjustment shaft 41 is arranged on the output shaft of the rotary power unit 3. One end of the adjusting bracket 4 is hinged to the output shaft of the rotary power unit 3 through the first angle adjustment shaft 41. A second angle adjustment shaft 51 is arranged on the top of the tool base 5. The other end of the adjusting bracket 4 is hinged to the tool base 5 through the second angle adjustment shaft 51. The center lines of the first angle adjustment shaft 41 and the second angle adjustment shaft 51 are parallel to each other.

[0027] In this embodiment, the rock breaking device adopts a top drive method. The maximum rotation speed of the rotary power unit 3 is not less than 5 r / min, and it can be steplessly adjusted in speed. It can achieve constant pressure feeding and can also achieve constant torque drilling. It can work normally under vertical installation conditions. The drill pipe assembly and the insert teeth are detachably and fixedly connected, which is convenient for adjusting the angle, size, and spacing of the insert teeth.

[0028] As a further optimization scheme, in this embodiment, a transverse adjustment beam 43 is horizontally arranged between the two adjusting brackets 4. The transverse adjustment beam 43 is detachably and fixedly connected to the two adjusting brackets 4 respectively.

[0029] In this embodiment, the stability of the two adjusting brackets 4 can be enhanced through the transverse adjustment beam 43. At the same time, an adjustment oil cylinder or an adjustment screw is arranged on the transverse adjustment beam 43 to realize the elongation or shortening of the transverse adjustment beam 43, so that the transverse adjustment beam 43 can assist in adjusting the angle of the adjusting bracket 4, further improving the convenience of use and the stability of the adjusting bracket 4.

[0030] In this embodiment, a plurality of adjustment holes 42 are equidistantly formed in the adjustment bracket 4 along its length direction. The two ends of the transverse adjustment beam 43 are inserted into the adjustment holes 42 and are detachably connected thereto, which facilitates the installation of the transverse adjustment beam 43.

[0031] Figure 9 It is a schematic structural diagram of the double teeth on the tool base in this embodiment. Figure 10 It is a schematic structural diagram of the triple teeth on the tool base in this embodiment, as Figure 9 、 Figure 10 shown. As a further optimization scheme, in this embodiment, a tooth insert slot 53 is formed at the bottom of the tool base 5. A rolling shaft 54 is arranged in the tooth insert slot 53 and is rotatably connected thereto. The central lines of the rolling shaft 54 and the hinge shaft are parallel to each other. The tooth inserts 6 are radially arranged on the tooth insert slot 53 along the radial direction of the rolling shaft 54, and the tails of the tooth inserts 6 are fixedly connected to the rolling shaft 54.

[0032] In this embodiment, through the rolling shaft 54 in the tooth insert slot 53 at the bottom of the tool base 5, a plurality of tooth inserts 6 are radially installed on the rolling shaft 54, which can realize the rock breaking by the rolling of the plurality of tooth inserts 6 and further improve the effect of rock breaking by simulating the motion track of the rolling cutter.

[0033] In this embodiment, a socket is installed at the position of the tooth insert 6. A plurality of pins are radially arranged on the rolling shaft 54 along its radial direction, and the socket is fixedly connected with the pins in a matching manner.

[0034] Figure 8 It is a schematic structural diagram of the single tooth on the tool base in this embodiment, as Figure 8 shown. When performing single / double tooth intrusion rock breaking, the tooth insert 6 is fixed at the bottom of the tool base 5, and a counterbore 52 is formed at the bottom of the tool base 5, and a plurality of tooth inserts 6 are inserted into the counterbore 52.

[0035] In the above embodiment, the tooth insert design uses ball teeth and cone teeth with a diameter of 5 mm, and the tool base 5 is a cylindrical base with a diameter of 30 mm and a height of 40 mm, or a prismatic shape with a side length of 30 mm and a height of 40 mm.

[0036] As a further optimization scheme, in this embodiment, a ratchet wheel 55 is fixedly sleeved on the rolling shaft 54, and a check pin 56 is hinged on the inner wall of the tooth insert slot 53, and the check pin 56 is connected with the ratchet wheel 55 in a matching manner.

[0037] In this embodiment, when performing the rock breaking by the rolling of the plurality of tooth inserts 6, the ratchet wheel 55 and the check pin 56 are used to prevent the rolling shaft 54 from rotating in the reverse direction, avoid the reverse rolling of the plurality of tooth inserts 6, and improve the stability of the rock breaking test by the rolling of the plurality of tooth inserts 6.

[0038] Figure 6 It is a top view of the top compression ring in this embodiment, as Figure 6As shown in the figure, as a further optimization solution, this embodiment further includes: a loading bin 1 fixedly arranged at the bottom of the drilling rig frame. A rock sample block 2 is placed in the loading bin 1. The rotary power unit 3 is located directly above the loading bin 1, and its output shaft extends vertically into the loading bin 1. A top pressure ring 14 is vertically arranged directly above the rock sample block 2. One end of the top pressure ring 14 abuts against the rock sample block 2, and the other end is fixedly connected to the loading bin 1.

[0039] In this embodiment, the rock sample block 2 is placed in the loading bin 1, and then the top pressure ring 14 and the loading bin 1 are used in cooperation to fix the rock sample block 2, improving the stability of the hob rock breaking simulation test.

[0040] In this embodiment, the maximum uniaxial compressive strength of the rock sample block is 150 MPa. Under the condition of no in-situ stress field, the maximum drilling pressure is 80 kN, the maximum torque is 5 kN·m, and the maximum penetration speed for rock breaking is not less than 5 mm / min.

[0041] The specific structure of the loading bin 1 in this embodiment is given, including: a bottom flange 11, a pipe body 12, and a top flange 13. The bottom flange 11 is horizontally and fixedly arranged on the drilling rig frame. The pipe body 12 is vertically arranged on the bottom flange 11 and is coaxial with it. The bottom of the pipe body 12 is fixedly connected to the bottom flange 11. The rock sample block 2 abuts against the bottom flange 11. The top flange 13 is horizontally and fixedly arranged on the top of the pipe body 12 and is coaxial with it. The top flange 13 is fixedly connected to the pipe body 12. The rotary power unit 3 is located directly above the top flange 13. The adjusting bracket 4 passes through the top flange 13 and extends into the pipe body 12. One end of the top pressure ring 14 abuts against the rock sample block 2, and the other end abuts against the top flange 13, thereby realizing the fixation of the rock sample block 2.

[0042] Figure 11 This is a schematic diagram of the installation of the rock sample block in this embodiment, as Figure 11 As shown in the figure, as a further optimization solution, an annular gap is provided between the periphery of the rock sample block 2 and the side wall of the loading bin 1 in this embodiment. A confining pressure water inlet pipe 16 penetrates through the upper side of the loading bin 1 and is communicated with its interior. A top cover plate 15 is arranged on the top of the loading bin 1 and is fixedly and sealedly connected. The output shaft of the rotary power unit 3 passes through the top cover plate 15 and is rotationally and sealedly connected to it.

[0043] In this embodiment, the top of the loading bin 1 is closed by the top cover plate 15, and then water is injected into the loading bin 1 through the confining pressure water inlet pipe 16, thereby simulating the confining pressure on the rock sample block 2.

[0044] In this embodiment, the top cover plate 15 is arranged above the top flange 13 of the loading bin 1. The top cover plate 15 is detachably and fixedly sealed to the top flange 13. The confining pressure inlet pipe 16 is arranged on the top flange 13, and the water outlet of the confining pressure inlet pipe 16 is directly above the annular gap.

[0045] In this embodiment, when the insert teeth perform vertical drilling during rock breaking, air or liquid is used for well flushing. Water inlet 151 and water outlet 152 are respectively vertically provided on the top cover plate 15, and liquid is flushed into the rock breaking space for the pressure of the simulated well flushing fluid.

[0046] When breaking rock under the condition of simulating the in-situ stress field, the full-section rock breaking diameter is Φ200mm. Among them, when performing vertical drilling, air or liquid is used for well flushing. For the pressure of the simulated well flushing fluid, liquid is flushed into the rock breaking space, and the maximum pressure-bearing capacity of the rock breaking space is 20MPa.

[0047] In this embodiment, the overall dimensions of the rock breaking device are controlled within a range of 1.0m in length and width and 1.5m in height, and rock breaking tests under two working conditions can be realized: rock breaking with pressure after installing the top cover plate and rock breaking without pressure after removing the top cover plate.

[0048] In the above embodiment, lifting rings or handles are arranged on the outer wall of the pipe body 12, the top cover plate 15, the top flange 13 and other structures, and the test machine frame or forklift can be used for lifting and disassembly, which is convenient for sample loading.

[0049] As a further optimization scheme, in this embodiment, an inner drill pipe 31 is coaxially and fixedly arranged at the end of the output shaft of the rotary power unit 3. The inner drill pipe 31 passes through the top cover plate 15 and extends into the loading bin 1. An outer casing 32 is coaxially sleeved on the inner drill pipe 31 and is rotationally and sealingly connected thereto. The outer casing 32 passes through the top cover plate 15 and is fixedly and sealingly connected thereto.

[0050] In this embodiment, the inner drill pipe 31 and the outer casing 32 form a drill pipe, and its length should meet the requirements that the installation of the drill bit and the drilling stroke are not less than 20mm.

[0051] Among them, the outer casing 32 cooperates with the top cover plate 15 to realize the functions of sealing and injecting confining pressure water and well flushing liquid. The outer casing 32 is provided with wire inlet and outlet holes for the wiring of test sensors. There is no fluid load acting on the inner edge of the outer casing, and the outer edge is subjected to the pressure of 20MPa well flushing liquid in the loading bin 1. The outer casing should be easy to disassemble and replace, and there can be no radial connection with the inner drill pipe 31. Its lower end can be directly connected to the housing of the first angle adjustment shaft 41, and its upper end does not need to be connected to the output end of the rotary power unit 3. The inner drill pipe 31 is mainly used to transmit the drilling pressure and torque, the upper end is connected to the output end of the rotary power unit 3, and the lower end is connected to the first angle adjustment shaft 41.

[0052] In this embodiment, the annular space between the inner drill pipe 31 and the outer casing 32 can be used to route the leads of sensors such as the weight-on-bit, torque, rotational speed, vibration, strain, temperature, and flow field pressure sensors arranged on the insert teeth 6 and the inner drill pipe 31, so that the leads are in a water-free and dry state.

[0053] As a further optimization scheme, in this embodiment, an axial pressure water inlet pipe 19 penetrates through the bottom of the loading bin 1 and is in communication with its interior, and the rock sample block 2 is located directly above the outlet of the axial pressure water inlet pipe 19.

[0054] In this embodiment, water is injected into the loading bin 1 directly below the rock sample block 2 through the axial pressure water inlet pipe to simulate the application of axial pressure to the rock sample block 2.

[0055] As a further optimization scheme, in this embodiment, an axial pressure piston 18 is provided between the outlet of the axial pressure water inlet pipe 19 and the rock sample block 2, and the axial pressure piston 18 is slidably and sealingly connected to the loading bin 1 along its axial direction.

[0056] In this embodiment, the axial pressure piston 18 is used to apply uniform axial pressure to the rock sample block 2 with the water injected into the loading bin 1 through the axial pressure water inlet pipe 19.

[0057] In this embodiment, the axial pressure piston 18 is arranged on the bottom flange 11 of the loading bin 1, and the axial pressure water inlet pipe 19 also penetrates through the bottom flange 11.

[0058] As a further optimization scheme, in this embodiment, a confining pressure drain pipe 17 penetrates through the lower side of the loading bin 1, and one end of the confining pressure drain pipe 17 is in communication with the annular gap.

[0059] In this embodiment, the water outside the rock sample block 2 is drained after the test by using the confining pressure drain pipe 17, and the water directly below the axial pressure piston 18 is drained from the axial pressure water inlet pipe 19.

[0060] As a further optimization scheme, in this embodiment, a load cell 21 is fixedly arranged on the output shaft of the rotary power unit 3, and a strain gauge sensor 24 is fixedly arranged on the insert teeth 6.

[0061] In this embodiment, the load cell 21 and the strain gauge sensor 24 are respectively connected to the data collector 22 in a signal manner. For parameters such as the weight-on-bit, torque, and rotational speed related to the working state of the drill rig itself, a direct monitoring method can be adopted (i.e., arranging the sensors on the insert teeth and the inner drill pipe, and leading out the sensor leads from the annular space between the middle layer and the outer casing), such as the load cell 21 and the strain gauge sensor 24. It is also possible to convert the weight-on-bit by monitoring the oil pressure of the cylinder of the vertical motor 74, convert the torque by monitoring the oil pressure of the rotary power unit 3, and convert the drill bit rotational speed by the drill pipe rotational speed.

[0062] The drill rig frame in this embodiment includes a bottom cross beam 71, a test machine cross beam 72, two vertical guide rails 73, a vertical motor 74, a vertical motor drive 75, and a moving cross beam 76. The two vertical guide rails 73 are vertically arranged on the bottom cross beam 71 and are located on both sides of the bottom flange 11. One end of the vertical guide rail 73 is fixedly connected to the bottom cross beam 71. The vertical motor drive 75 is arranged on the vertical guide rail 73 and is slidably connected thereto along the length direction of the vertical guide rail 73. The moving cross beam 76 is horizontally arranged between the two vertical guide rails 73. The vertical motors 74 are respectively fixedly arranged at both ends of the moving cross beam 76. The vertical motors 74 are connected to the vertical motor drive 75. The rotary power unit 3 is vertically and fixedly arranged on the moving cross beam 76.

[0063] In this embodiment, the drilling pressure is provided by the vertical motor 74, and the torque for drilling is provided by the rotary power unit 3.

[0064] In this embodiment, there should be at least an expansion space inside the drill rig frame to accommodate the outward expansion of the drill pipe assembly with a diameter of Φ160mm, and a space for height adjustment of 140mm up and down.

[0065] For the rock-breaking device that simulates the movement trajectory of the hob in the present invention, generally, first install the rock sample test block 2 on the bottom flange 11, then install the pipe body 12, then install the top flange 13, then adjust the intrusion range and angle of the inserted teeth 6, install the inserted tooth cover and seal it with the top cover plate, and then connect the inner drill pipe 31 to the output shaft of the rotary power unit 3 in the installation mode.

[0066] Adopt the removal mode of first disconnecting the connection between the inner drill pipe 31 and the output shaft of the rotary power unit 3, then removing the top cover plate, lifting the drill pipe assembly by the vertical motor 74, and then removing the drill pipe assembly.

[0067] When installing the rock sample test block 2, place the rock sample test block 2 on the axial pressure piston, place the top pressure ring 14 on the top, and put on the heat shrinkable tube for sealing; Install the pipe body 12, press on the top flange 13, and complete the sealing of the confining pressure loading chamber.

[0068] Adjust the first angle adjustment shaft 41 and the transverse adjustment beam, adjust the angle of the second angle adjustment shaft 51, and install the inserted teeth; Arrange the sensor lines; If an underwater rock-breaking test is to be carried out, pass the inner drill pipe 31 through the top cover plate and then connect it to the output shaft of the rotary power unit 3. If a free surface rock-breaking test is to be carried out, directly connect it to the output shaft of the rotary power unit 3; Adjust the position of the vertical motor and conduct the test.

[0069] During the test, the prototype sample, that is, real rock, was used for the rock sample block 2. Therefore, for the loading of confining pressure and axial pressure on the rock sample, the actual in-situ stress conditions were referred to. According to statistics, the in-situ stress of rock strata in the range of 25 m to 2700 m underground can be roughly calculated according to the average unit weight value of 27 kN / m 3 and generally, the rock stratum depth above 700 m is considered deep mining. Therefore, taking the deep pressure at 1000 m as an example, the designed values of axial pressure and confining pressure for the rock sample loading chamber were set to 40 MPa.

[0070] The rock sample block was a cylindrical specimen. For the convenience of sampling, the radius of the rock sample block was taken as 200 mm, and the height of the rock sample block was taken as 100 mm. This size can be adjusted according to the design.

[0071] Axial pressure and confining pressure were applied to the rock sample block through the axial pressure inlet pipe 19 and the confining pressure inlet pipe 16. A reaction rod 20 was arranged between the bottom flange 11 and the top flange 13. The reaction rod 20 was connected by fastening nuts to bear the reaction forces brought by the confining pressure and axial pressure. Sealing rings were arranged between the bottom flange 11, the pipe body 12, and the top flange 13 of the loading chamber 1 to prevent the pressurized liquid from leaking.

[0072] The rock-breaking device for simulating the movement trajectory of the hob in the present invention can simulate the rock-breaking process of the insert hob, realize the multi-tooth cooperative rock-breaking test, and analyze the wear, stress conditions, and rock-breaking effect of the inserts during the rock-breaking process.

[0073] The tests that this rock-breaking device can complete include but are not limited to the following: (1) Realize the intrusion rock-breaking test of single / multiple inserts under conditions such as different angles, spacings, speeds, and intrusion forces; (2) Be able to simulate the linear cutting test and rotary cutting test of the hob; (3) Can simulate the in-situ stress environment of the rock and control the confining pressure and axial pressure of the rock sample block; (4) Can monitor in real time the stress, displacement of the inserts, and the crack propagation of the rock during the rock-breaking process; (5) Can realize the rock-breaking test of mechanical tools under high-pressure water.

[0074] The above-disclosed are only the preferred specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto, and any changes that can be thought of by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A rock-breaking device that simulates the motion trajectory of a hob, characterized in that, Comprising: A drilling rig frame, a rotary power unit (3) provided on the drilling rig frame, and a drill pipe assembly. The rotary power unit (3) is fixed on the drilling rig frame. The drill pipe assembly includes: Two adjusting brackets (4) respectively arranged at the end of the output shaft of the rotary power unit (3). One end of the adjusting bracket (4) is hinged to the output shaft of the rotary power unit (3), and the hinge shaft is horizontally arranged. After adjusting the angle of the adjusting bracket (4), it is locked by a fastener; Two cutter bases (5) respectively arranged at the other ends of the two adjusting brackets (4). The cutter base (5) is hinged to the adjusting bracket (4). The center lines of the hinge shafts at both ends of the adjusting bracket (4) are parallel to each other. After adjusting the angle of the cutter base (5), it is locked by a fastener. A plurality of inserted teeth (6) are fixedly provided at the bottom of the cutter base (5).

2. The rock-breaking device for simulating the movement track of a hob according to claim 1, wherein, A horizontal adjusting beam (43) is horizontally arranged between the two adjusting brackets (4). The horizontal adjusting beam (43) is detachably and fixedly connected to the two adjusting brackets (4) respectively.

3. The rock-breaking device for simulating the movement track of a hob according to claim 1, wherein A tooth inserting slot (53) is formed at the bottom of the cutter base (5). A rolling shaft (54) is arranged in the tooth inserting slot (53) and is rotatably connected thereto. The rolling shaft (54) is parallel to the center line of the hinge shaft. The inserted teeth (6) are radially arranged in a radial pattern on the tooth inserting slot (53) along the rolling shaft (54). The tail of the inserted tooth (6) is fixedly connected to the rolling shaft (54).

4. The rock-breaking device for simulating the movement track of a hob according to claim 3, characterized in that, A ratchet wheel (55) is sleeved and fixed on the rolling shaft (54). A check pin (56) is hinged on the inner wall of the tooth inserting slot (53). The check pin (56) is cooperatively connected with the ratchet wheel (55).

5. The rock-breaking device for simulating the motion trajectory of a hob according to claim 1, characterized in that, Further comprising: A loading bin (1) fixedly provided at the bottom of the drilling rig frame. A rock sample test block (2) is placed in the loading bin (1). The rotary power unit (3) is located directly above the loading bin (1), and its output shaft vertically extends into the loading bin (1). A top pressing ring (14) is vertically arranged directly above the rock sample test block (2). One end of the top pressing ring (14) abuts against the rock sample test block (2), and the other end is fixedly connected to the loading bin (1).

6. The rock-breaking device for simulating the motion track of a hob according to claim 5, characterized in that An annular gap is provided between the periphery of the rock sample test block (2) and the side wall of the loading bin (1). A confining pressure water inlet pipe (16) penetrates through the upper side of the loading bin (1) and is communicated with its interior. A top cover plate (15) is provided at the top of the loading bin (1) and is fixedly and sealedly connected. The output shaft of the rotary power unit (3) passes through the top cover plate (15) and is rotatably and sealedly connected thereto.

7. The rock-breaking device for simulating the movement track of a hob according to claim 6, wherein, An inner drill pipe (31) is coaxially and fixedly provided at the end of the output shaft of the rotary power unit (3). The inner drill pipe (31) passes through the top cover plate (15) and extends into the loading bin (1). An outer casing (32) is coaxially sleeved on the inner drill pipe (31) and is rotatably and sealedly connected thereto. The outer casing (32) passes through the top cover plate (15) and is fixedly and sealedly connected thereto.

8. The rock-breaking device for simulating the motion trajectory of a hob according to claim 5, characterized in that, An axial pressure water inlet pipe (19) penetrates through the bottom of the loading bin (1) and is communicated with its interior. The rock sample test block (2) is located directly above the outlet of the axial pressure water inlet pipe (19).

9. The rock-breaking device for simulating the motion trajectory of a hob according to claim 8, characterized in that, An axial compression piston (18) is provided between the outlet of the axial compression water inlet pipe (19) and the rock sample block (2), and the axial compression piston (18) is slidably and sealingly connected to the loading chamber (1) along its axial direction.

10. The rock-breaking device for simulating the motion track of a hob according to claim 1, wherein, A load cell (21) is fixedly provided on the output shaft of the rotary power unit (3), and a strain gauge sensor (24) is fixedly provided on the insert tooth 6.

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