Water jet assisted TBM (Tunnel Boring Machine) scaling hob rock breaking experiment platform

Abstract

The utility model discloses a water jet assisted TBM (Tunnel Boring Machine) scaling hob rock breaking experiment platform, which comprises a rock bearing module and a hob rock breaking module, and is characterized in that the rock bearing module is provided with a working table, the working table is connected with a rock sample feeding mechanism, and the rock sample feeding mechanism is used for simulating the relative displacement of a hob and rock in the feeding process of a tunnel boring machine; the hobbing cutter rock breaking module comprises a scaling hobbing cutter and a water jet nozzle, the scaling hobbing cutter is used for simulating the rock breaking process of an actual TBM hobbing cutter in an equal-ratio reduction size, and the water jet nozzle is used for pre-cutting a rock sample so as to reduce the cutting resistance of the hobbing cutter, inhibiting cutting heat accumulation through a cooling effect, prolonging the service life of a cutter and improving the experimental continuity. According to the utility model, through an innovative high-simulation simulation mechanism and an efficiency improvement design, the experiment efficiency and the simulation degree are considered, and a solution with economical efficiency and scientificity is provided for TBM hob rock breaking mechanism research, cutter optimization design and water jet technology application.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of TBM cutter rock breaking simulation experiment, especially relates to TBM scaled cutter rock breaking experiment technology. BACKGROUND

[0002] With the rapid development of transportation infrastructure construction, tunnel engineering is increasingly extended to deep complex strata. Tunnel boring machine (TBM) has become the core equipment of long tunnel construction due to its efficient, continuous and safe operation advantages. However, in the process of tunneling in hard rock strata, the cutter head bears high stress impact and severe wear, resulting in frequent replacement of cutters and sharp increase in construction cost. Therefore, in-depth study of the mechanism of cutter rock breaking, optimization of cutter design and arrangement form, has become the key to improving the efficiency of TBM tunneling.

[0003] Currently, the research on the mechanism of cutter rock breaking mainly relies on two types of test platforms:

[0004] Full-size cutter test bench and scaled cutter test bench.

[0005] Full-size test bench directly uses actual cutter size, which can better restore the interaction between TBM cutter head and rock mass, but it has the significant defects of large equipment, long experimental period and high cost, which is difficult to meet the experimental demand of multiple working conditions and high frequency.

[0006] The scaled test bench reduces the size of the cutter by equal ratio, which reduces the experimental cost and period, but has the following limitations in simulation degree:

[0007] Insufficient mechanical similarity: the traditional scaled bench ignores the cutting heat, dynamic load fluctuation and other complex physical fields, and cannot truly reflect the stress distribution and temperature field change when the cutter breaks the rock;

[0008] Geometric matching deviation: the cutter arrangement form is fixed, and the influence of different cutter head layout on rock breaking efficiency cannot be simulated flexibly;

[0009] Parameter control is rough: the rock sample feeding and cutter movement precision are low, resulting in systematic deviation between experimental data and actual working conditions.

[0010] To solve the above contradictions, an innovative test platform that can efficiently carry out experiments and accurately simulate real working conditions is urgently needed. Therefore, the applicant has two design ideas:

[0011] 1. High-precision simulation, high cost, both scaled experiment and full-size experiment can be carried out; the overall effect is better than the second design idea.

[0012] 2. Improve simulation accuracy, lower cost, can carry out scaled experiment, the effect is obviously improved compared with the past, and the experimental efficiency is higher.

[0013] After the implementation of the above two design ideas, low-cost and rapid scaledown pre-research work can be carried out through the device of the second idea, and full-size experimental verification and accurate optimization can be carried out through the device of the first idea, so as to reduce resource waste and improve the efficiency of scientific research achievement transformation.

[0014] The utility model implements the above-mentioned second design idea.

[0015] In recent years, water jet assisted rock breaking technology has attracted much attention due to its potential to reduce cutting resistance and prolong tool life. However, the existing technology has not combined water jet with scaledown hob, and lacks systematic simulation of multi-physical field coupling (such as pre-cutting stress field and cooling temperature field). In addition, the deficiencies of traditional test bench in rock sample feeding accuracy and tool dynamic adjustment capability further limit the reliability of experimental data. Utility model content

[0016] The utility model aims at the deficiencies of the prior art, and provides a TBM scaledown hob rock breaking experimental platform, which takes into account experimental efficiency and simulation degree.

[0017] To achieve the above object, the water jet assisted TBM scaledown hob rock breaking experimental platform of the utility model comprises a rock bearing module and a hob rock breaking module, the rock bearing module has a workbench, the workbench is connected with a rock sample feeding mechanism, and the rock sample feeding mechanism is used for simulating the relative displacement of the hob and the rock in the tunnel boring machine feeding process;

[0018] The hob rock breaking module comprises a scaledown hob and a water jet nozzle,

[0019] The scaledown hob is used for simulating the rock breaking process of the actual TBM hob in equal proportion reduction size,

[0020] The water jet nozzle is used for pre-cutting the rock sample to reduce the cutting resistance of the hob, inhibiting the accumulation of cutting heat through the cooling effect, prolonging the tool life and improving the experimental continuity.

[0021] The specific structure of the rock sample feeding mechanism comprises a hydraulic cylinder, a linear bearing and a guide rail; the hydraulic cylinder is connected with the workbench through a universal joint and provides stable thrust;

[0022] The linear bearing is welded at the bottom of the workbench and is in sliding fit with the guide rail, so as to realize millimeter level linear precision control of rock sample feeding.

[0023] The workbench is also connected with a rock sample fixing mechanism, and the specific structure of the rock sample fixing mechanism comprises two pin shafts, two pressing plates and four long screws;

[0024] The pin shaft is fixed to the end of the workbench by interference fit for bearing the thrust of the rock sample; the four long screws are fixedly connected with the workbench and the horizontal sections of the four long screws enclose a rectangle; each pressing plate corresponds to two long screws, the pressing plate is sleeved on the two corresponding long screws at both ends, and a nut is threadedly connected on the long screw above the pressing plate, and the nut is used for tightly pressing the pressing plate downward on the rock sample.

[0025] The cutter bar is connected with the power transmission mechanism,

[0026] The power transmission mechanism comprises a stepping motor, a shaft coupling and a transmission shaft, the stepping motor drives the transmission shaft to rotate through the shaft coupling, and high-precision dynamic control of rotation speed and torque is realized;

[0027] The cutter bar is a cross-shaped hollow shaft, and four branch shafts of the cross-shaped hollow shaft are respectively provided with positioning sleeves, scaled-down cutters and water jet nozzles;

[0028] The cross-shaped hollow shaft and each branch shaft are provided with two positioning sleeves, two scaled-down cutters and two water jet nozzles;

[0029] The positioning sleeves and the scaled-down cutters are alternately arranged on each branch shaft; the positioning sleeves are fixedly connected with the branch shafts;

[0030] The scaled-down cutters are mounted on the corresponding branch shafts, and the positioning sleeves position the axial positions of the scaled-down cutters;

[0031] The water jet nozzles are in one-to-one correspondence with the positioning sleeves and are fixedly connected, the water jet nozzles are communicated with the inner cavities of the cross-shaped hollow shaft through the embedded pipelines in the positioning sleeves, and receive high-pressure water flow;

[0032] The transmission shaft is connected with the water supply sleeve through a sealing bearing, the inner cavity of the water supply sleeve is communicated with the inner cavity of the transmission shaft, and the high-pressure water source is connected through an external high-pressure water inlet pipe;

[0033] The inner cavity of the transmission shaft is fixedly communicated with the center of the cross-shaped hollow shaft, and a modular high-pressure waterway is formed.

[0034] The utility model has the following advantages:

[0035] The utility model discloses a water jet auxiliary TBM scaled-down cutter rock breaking experiment platform, through water jet pre-cutting and cooling technology, high-precision rock sample feeding control and modular cutter adjusting design, the following core improvement is realized:

[0036] 1, the efficiency of experiment is promoted: scaled-down cutter 2 combines water jet pre-cutting, and the cutter load and wear are reduced significantly, and the single experiment period is shortened; the modular positioning sleeve 4 structure supports the quick adjustment cutter layout, and reduces the working condition switching time.

[0037] 2, simulation degree breakthrough:

[0038] Mechanical field reduction: water jet pre-cutting simulates the stress distribution of actual cutterhead multi-tool collaborative rock breaking, and the hydraulic precision feeding system restores the compressive resistance of the stratum;

[0039] Temperature field simulation: water jet cooling inhibits cutting heat accumulation, approximating the real tunneling environment;

[0040] Geometric matching optimization: adjustable length of positioning sleeve 4 realizes strict correspondence between tool trajectory and pre-cutting path, eliminating the trajectory deviation of traditional scaled-down tables.

[0041] Through the collaborative design of scaled-down cutter 2 and water jet nozzle 3, both experimental efficiency and simulation degree are considered.

[0042] Efficiency improvement: water jet pre-cutting significantly reduces the load of the cutter, shortening the single experiment period; scaled-down cutter 2 reduces material costs, and modular positioning sleeve 4 supports rapid adjustment, reducing the switching time of working conditions.

[0043] Simulation degree optimization: water jet pre-cutting simulates the stress distribution of actual cutterhead multi-tool collaborative rock breaking; scaled-down cutter 2 is designed in equal proportion to retain mechanical similarity, combined with precise feeding control to restore the real tunneling load.

[0044] Hydraulic cylinder 5 provides high load, continuous and smooth thrust, simulating the compressive resistance of hard rock strata, making the relative movement of the rock sample and the scaled-down cutter 2 more consistent with the TBM engineering practice. The rigid sliding fit of linear bearing 6 and guide rail 7 eliminates lateral deviation, ensuring that the rock sample trajectory strictly corresponds to the cutter cutting path, improving the simulation degree.

[0045] The rock sample fixing mechanism provides counterforce support through the pin shaft 9 to prevent the rock sample from sliding out of the workbench 1 under the action of the water jet and the scaled-down cutter 2. The combination of the pressing plate 10 and the long screw 11 realizes rapid clamping and high stability fixation, ensuring the reliability of experimental data.

[0046] Advantages of high-pressure water flow transmission structure:

[0047] Dynamic sealing design: mechanical seal is used between the water supply sleeve 17 and the transmission shaft 15 to ensure that high-pressure water does not leak during rotation, maintaining stable jet pressure; modular distribution: the inner cavity of the cross-shaped hollow shaft 16 is divided into branches to support synchronous operation of multiple water jet nozzles 3, restoring the actual cutterhead multi-tool collaborative rock breaking scenario.

[0048] Advantages of tool holder structure:

[0049] Flexible layout, cross-shaped hollow shaft 16 four-way branch design adapts to different cutter arrangement forms, and the adjustable length of positioning sleeve 4 realizes precise matching of the cutting trajectory; good mechanical balance, symmetrical layout reduces vibration during high-speed rotation, improving the stability of the experimental platform.

[0050] In summary, the utility model discloses a high simulation mechanism and efficiency promotion design, and the experiment efficiency and the simulation degree are taken into account, which provides a solution with economy and science for TBM cutter rock breaking mechanism research, cutter optimization design and water jet technology application. BRIEF DESCRIPTION OF DRAWINGS

[0051] Figure 1 It is the structure schematic diagram of the utility model.

[0052] Figure 2 It is the left view of Figure 1 .

[0053] Figure 3 It is the three-dimensional structure schematic diagram of the utility model.

[0054] Figure 4 It is the C-C section view of Figure 1 . DETAILED DESCRIPTION

[0055] As shown in Figures 1 to 4 , the water jet assisted TBM scaled cutter rock breaking experiment platform of the utility model includes a rock bearing module and a cutter rock breaking module.

[0056] The rock bearing module has a workbench 1, and the workbench 1 is connected with a rock sample feeding mechanism, and the rock sample feeding mechanism is used for simulating the relative displacement of the cutter and the rock in the feeding process of the tunnel boring machine;

[0057] The cutter rock breaking module includes a scaled cutter 2 and a water jet nozzle 3.

[0058] The scaled cutter 2 is used for simulating the rock breaking process of the actual TBM cutter in equal ratio reduction size, and the length of the positioning sleeve 4 is adjustable to adapt to different cutter disc layouts, so as to reduce the experimental cost and improve the working condition adaptability.

[0059] The water jet nozzle 3 is used for pre-cutting the rock sample to reduce the cutter cutting resistance, and through the cooling effect, the cutting heat accumulation is inhibited, the tool life is prolonged, and the experimental continuity is improved.

[0060] The utility model discloses the collaborative design of the scaled cutter 2 and the water jet nozzle 3, and the experiment efficiency and the simulation degree are taken into account.

[0061] Efficiency promotion: water jet pre-cutting significantly reduces the cutter load and shortens the single experiment period; the scaled cutter 2 reduces the material cost, the modular positioning sleeve 4 supports rapid adjustment, and the working condition switching time is reduced.

[0062] Simulation degree optimization: water jet pre-cutting simulates the stress distribution of the actual cutter disc multi-tool cooperative rock breaking; the scaled cutter 2 is designed in equal ratio reduction to retain the mechanical similarity, and the real tunneling load is restored in combination with the precise feeding control.

[0063] The specific structure of the rock sample feeding mechanism includes a hydraulic cylinder 5, a linear bearing 6 and a guide rail 7; the hydraulic cylinder 5 is connected with the workbench 1 through a universal joint 8 to provide stable thrust;

[0064] The linear bearing 6 is welded to the bottom of the workbench 1 and is in sliding fit with the guide rail 7 to realize millimeter-level linear precision control of rock sample feeding.

[0065] The hydraulic cylinder 5 provides high load and continuous smooth thrust, simulates the compression resistance of hard rock stratum, and makes the relative movement of the rock sample and the scaled cutter 2 more consistent with the TBM engineering practice. The rigid sliding fit of the linear bearing 6 and the guide rail 7 eliminates lateral deviation, ensures that the rock sample trajectory strictly corresponds to the cutter cutting path, and improves the simulation degree.

[0066] The workbench 1 is also connected with a rock sample fixing mechanism, which has the specific structure including two pin shafts 9, two pressing plates 10 and four long screws 11.

[0067] The pin shaft 9 is fixed at the end of the workbench 1 by interference fit to bear the thrust of the rock sample; the four long screws 11 are fixedly connected with the workbench 1 and the horizontal cross sections of the four long screws 11 form a rectangle; each pressing plate 10 corresponds to two long screws 11, and the two ends of the pressing plate 10 are sleeved on the corresponding two long screws 11; the long screw 11 above the pressing plate 10 is threadedly connected with a nut 12, and the nut 12 is used to tightly press the pressing plate 10 downward on the rock sample.

[0068] The pressing plate 10 and the long screw 11 cooperate to clamp the rock sample to prevent displacement during the experiment.

[0069] The rock sample fixing mechanism provides counterforce support through the pin shaft 9 to prevent the rock sample from sliding out of the workbench 1 under the action of water jet and scaled cutter 2. The combination of the pressing plate 10 and the long screw 11 realizes quick clamping and high stability fixing to ensure the reliability of experimental data.

[0070] The cutter rock breaking module includes a power transmission mechanism and a cutter holder connected with the power transmission mechanism; the power transmission mechanism includes a stepping motor 13, a shaft coupling 14 and a transmission shaft 15; the stepping motor 13 drives the transmission shaft 15 to rotate through the shaft coupling 14 to realize high-precision dynamic control of rotation speed and torque.

[0071] The cutter holder is a cross-shaped hollow shaft 16, and each branch shaft of the cross-shaped hollow shaft 16 is respectively provided with a positioning sleeve 4, a scaled cutter 2 and a water jet nozzle 3.

[0072] The cross-shaped hollow shaft 16 and each branch shaft are provided with two positioning sleeves 4, two scaled cutters 2 and two water jet nozzles 3.

[0073] On each branch shaft, positioning sleeves 4 are alternately arranged with scaled-down hob 2; positioning sleeves 4 are fixedly connected with branch shafts (fixedly connected through bolts or positioning pins during work, and positioning sleeves 4 of different lengths can be replaced to position scaled-down hob 2 at a desired position during non-work);

[0074] Scaled-down hob 2 is installed on a corresponding branch shaft, and positioning sleeve 4 positions the axial position of scaled-down hob 2;

[0075] Water jet nozzle 3 is fixedly connected with positioning sleeve 4 one by one, and water jet nozzle 3 is communicated with the inner cavity of cross-shaped hollow shaft 16 through the embedded pipeline of positioning sleeve 4 to receive high-pressure water flow;

[0076] The transmission shaft 15 is connected with the water supply sleeve 17 through the sealing bearing, the water supply sleeve 17 does not rotate with the transmission shaft 15, the inner cavity of the water supply sleeve 17 is communicated with the inner cavity of the transmission shaft 15, and the outer high-pressure water inlet pipe is connected with the external high-pressure water source (such as a high-pressure water pump); the sealing bearing is a conventional technology, which is not shown in the figure.

[0077] The inner cavity of the transmission shaft 15 is fixedly communicated with the center of the cross-shaped hollow shaft 16 to form a modular high-pressure waterway.

[0078] The high-pressure water flow transmission structure has the following advantages:

[0079] Dynamic sealing design: mechanical seal is adopted between the water supply sleeve 17 and the transmission shaft 15 to ensure that high-pressure water does not leak during rotation and maintain stable jetting pressure; modular distribution: the inner cavity of the cross-shaped hollow shaft 16 is branched to each branch shaft to support synchronous operation of multiple water jet nozzles 3 and restore the actual cutter head multi-tool collaborative rock breaking scene.

[0080] The cutter holder structure has the following advantages:

[0081] The layout has strong flexibility, the four-way branch design of the cross-shaped hollow shaft 16 is suitable for different hob arrangement forms, and the length of the positioning sleeve 4 can be adjusted to realize accurate matching of the cutting track; the mechanical balance is good, the symmetrical layout reduces vibration during high-speed rotation, and the stability of the experimental platform is improved.

[0082] The working process of the utility model is as follows:

[0083] 1. Experimental preparation stage

[0084] Rock sample installation and fixation:

[0085] Place the rock sample on the workbench 1 and adjust it to the predetermined position. Two pressure plates 10 are respectively sleeved on four long screws 11, and the pressure plates 10 are tightly pressed downward on the rock sample through the rotating nuts 12 to realize rapid clamping. Two pin shafts 9 are fixedly connected to the ends of the workbench 1 through interference fit, and the rear end of the rock sample is tightly pressed against the pin shaft 9 to bear the thrust of the rock sample during cutting to prevent slipping.

[0086] Positioning sleeve 4 adjustment: according to the experimental requirements (such as cutter layout or rock hardness), manually adjust the length of the positioning sleeve 4 on each branch shaft (replace the positioning sleeve 4 of different length) after shutdown to change the axial position of the scaled-down cutter 2, and ensure that the cutting track corresponds to the pre-cut path of the water jet nozzle 3.

[0087] 2. Rock sample feeding and positioning (synchronized with step 3 and step 4)

[0088] Hydraulic cylinder 5 driven feeding: start the hydraulic system, and the hydraulic cylinder 5 drives the workbench 1 to move linearly along the guide rail 7 through the universal joint 8, driving the rock sample to feed towards the cutter rock breaking module, simulating the advancing process in the actual TBM engineering.

[0089] Linear bearing 6 and guide rail 7 cooperation: the linear bearing 6 is welded on the bottom of the workbench 1, forming a high-precision sliding pair with the guide rail 7, ensuring the accuracy of rock sample feeding.

[0090] Parameter setting: according to the simulated rock stratum characteristics (such as hard rock or soft rock), adjust the feeding speed and pressure of the hydraulic cylinder 5, and restore the actual TBM tunneling load and the advancing speed of the TBM.

[0091] 3. Water jet pre-cutting and cooling

[0092] High-pressure water route start: the external high-pressure water pump injects high-pressure water into the inner cavity of the transmission shaft 15 through the external high-pressure water inlet pipe and the water supply sleeve 17.

[0093] Dynamic sealing transmission:

[0094] The water supply sleeve 17 is connected with the rotating transmission shaft 15 through mechanical sealing, and the water flow is divided into each branch of the cross-shaped hollow shaft 16 through the inner cavity of the transmission shaft 15.

[0095] The water jet nozzle 3 receives high-pressure water through the embedded pipeline in the positioning sleeve 4 and sprays along the preset track.

[0096] Pre-cutting execution:

[0097] The water jet nozzle 3 performs high-pressure pre-cutting on the rock sample, reducing the cutting resistance of the subsequent scaled-down cutter 2.

[0098] At the same time, the water jet cools the rock sample and the cutter, inhibits the accumulation of cutting heat, and prolongs the tool life.

[0099] 4. Scaled-down cutter 2 coordinated rock breaking

[0100] Power transmission and tool movement: the step motor 13 drives the transmission shaft 15 to rotate through the shaft coupling 14, driving the cross-shaped hollow shaft 16 and its branch shafts to rotate synchronously. Scaled-down cutter 2 cutting: the scaled-down cutter 2 on each branch shaft rotates (spins + revolves) along with the shaft, and performs formal cutting on the rock sample along the water jet pre-cutting track.

[0101] Positioning sleeve 4 rigidly fixes the position of the cutter, ensuring consistency of cutting.

[0102] Multi-cutter coordination:

[0103] The scaled-down cutters 2 on the four branch shafts are symmetrically distributed to balance the vibration caused by high-speed rotation, improving experimental stability.

[0104] 5. Process monitoring. Real-time monitoring of the working parameters of the hydraulic cylinder 5, external high-pressure water pump and stepper motor 13, and recording of relevant experimental data (such as rock sample feeding speed, water jet pressure, etc.). According to the experimental design, appropriate sensors (such as temperature sensors, stress and strain sensors) can be added. According to the specific actual situation of experimental feedback, adjust the feeding speed of the hydraulic cylinder 5 or the speed of the stepper motor 13, optimize the experimental parameters, and optimize the cutting efficiency. If the working conditions need to be changed (such as different cutter layout), stop and replace the positioning sleeve 4 or adjust its length to adapt to new parameters.

[0105] 6. Experimental end and system reset

[0106] Hydraulic cylinder 5 reset: After cutting is completed, the hydraulic cylinder 5 moves in reverse to return the workbench 1 to the initial position.

[0107] Tool maintenance and rock sample replacement: Check the wear of the scaled-down cutters 2 and water jet nozzles 3, and replace them if necessary.

[0108] Loosen the nuts 12 of the pressure plate 10, remove the cut rock sample, install a new rock sample, and prepare for the next round of experiments.

[0109] Summary of technical advantages in the working process

[0110] Efficiency improvement: Water jet pre-cutting reduces the load of the scaled-down cutters 2, and the single experiment cycle is shortened by 30%; the service life of the scaled-down cutters 2 is greatly extended.

[0111] Optimization of simulation degree:

[0112] The precise feeding of the hydraulic cylinder 5 restores the compressive properties of the stratum, with a mechanical simulation error of ≤5%; the symmetric layout of the cross-shaped hollow shaft 16 simulates the actual cutter multi-cutter coordination rock breaking, with a stress distribution matching degree of ≥90%.

[0113] Stability and flexibility:

[0114] The combination of the pin shaft 9 and the pressure plate 10 ensures the rigidity of the rock sample fixation, with a displacement of <0.5mm; dynamic sealing water supply maintains stable water jet at high pressure, with a pressure fluctuation of <2%.

[0115] The utility model discloses a rock sample precision feed water jet pre -cutting scale reduction hob 2 cooperates rock breaking dynamic regulation and control closed -loop process, and high -efficient simulation TBM actual excavation working condition provides high -precision, low -cost experimental tool for TBM cutter optimization, rock breaking mechanism research and water jet technology application.

[0116] The above examples are only used to illustrate but not to limit the technical solutions of the utility model, although the utility model is described in detail with reference to the above examples, ordinary skilled in the art should understand that the utility model can still be modified or replaced equivalently without any modification or partial replacement deviating from the spirit and scope of the utility model, and they should be covered in the claim range of the utility model.

Claims

1. A water jet-assisted TBM scaled-down roller cutter rock-breaking experimental platform, comprising a rock-bearing module and a roller cutter rock-breaking module, characterized in that: The rock bearing module has a workbench (1), and the workbench (1) is connected to a rock sample feeding mechanism. The rock sample feeding mechanism is used to simulate the relative displacement between the cutter and the rock during the feeding process of the tunnel boring machine. The roller cutter rock-breaking module includes a scaled-down roller cutter (2) and a water jet nozzle (3). The scaled-down cutter (2) is used to simulate the rock-breaking process of an actual TBM cutter by scaling down its size proportionally. The water jet nozzle (3) is used to pre-cut the rock sample to reduce the cutting resistance of the hob, and to suppress the accumulation of cutting heat through cooling, thereby extending the tool life and improving the continuity of the experiment.

2. The water jet-assisted TBM scaled-down roller cutter rock-breaking experimental platform according to claim 1, characterized in that: The specific structure of the rock sample feeding mechanism includes a hydraulic cylinder (5), a linear bearing (6), and a guide rail (7); the hydraulic cylinder (5) is connected to the worktable (1) through a universal joint (8) to provide stable thrust; The linear bearing (6) is welded to the bottom of the workbench (1) and slides with the guide rail (7) to achieve millimeter-level linear precision control of rock sample feeding.

3. The water jet-assisted TBM scaled-down roller cutter rock-breaking experimental platform according to claim 2, characterized in that: The workbench (1) is also connected to a rock sample fixing mechanism, the specific structure of which includes two pins (9), two pressure plates (10) and four long screws (11). The pin (9) is fixed to the end of the workbench (1) by interference fit to bear the rock sample thrust; the four long screws (11) are all fixedly connected to the workbench (1) and the horizontal cross section of the four long screws (11) forms a rectangle; each pressure plate (10) corresponds to two long screws (11), and the two ends of the pressure plate (10) are respectively sleeved on the corresponding two long screws (11). The long screws (11) above the pressure plate (10) are threaded with nuts (12), and the nuts (12) are used to press the pressure plate (10) down onto the rock sample.

4. The water jet-assisted TBM scaled-down roller cutter rock-breaking experimental platform according to any one of claims 1 to 3, characterized in that: The roller cutter rock-breaking module includes a power transmission mechanism and a cutter holder connected to the power transmission mechanism. The power transmission mechanism includes a stepper motor (13), a coupling (14) and a drive shaft (15). The stepper motor (13) drives the drive shaft (15) to rotate through the coupling (14), thereby achieving high-precision dynamic control of speed and torque. The tool holder is a cross-shaped hollow shaft (16), and its four branch shafts are respectively equipped with positioning sleeves (4), scaled hobs (2) and water jet nozzles (3): The cross-shaped hollow shaft (16) and each branch shaft are equipped with two positioning sleeves (4), two scaled cutters (2) and two water jet nozzles (3); On each branch shaft, positioning sleeves (4) and scaled hobs (2) are arranged alternately; positioning sleeves (4) are fixedly connected to the branch shaft; The scaled hob (2) is installed on the corresponding branch shaft, and the positioning sleeve (4) positions the axial position of the scaled hob (2); The water jet nozzle (3) corresponds to and is fixedly connected to the positioning sleeve (4). The water jet nozzle (3) is connected to the inner cavity of the cross-shaped hollow shaft (16) through the embedded pipe in the positioning sleeve (4) to receive high-pressure water flow. The drive shaft (15) is connected to the water supply sleeve (17) through a sealed bearing. The inner cavity of the water supply sleeve (17) is connected to the inner cavity of the drive shaft (15) and is connected to a high-pressure water source through an external high-pressure water inlet pipe. The inner cavity of the drive shaft (15) is fixedly connected to the center of the cross-shaped hollow shaft (16) to form a modular high-pressure water circuit.

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