Shield hob rock breaking test device for shield to pass through karst cave

Abstract

The invention relates to the technical field of shield construction, in particular to a shield hob rock breaking test device for a shield to pass through a karst cave, the shield hob rock breaking test device is characterized in that the top of a bottom shell is connected with a middle plate frame, the top of the middle plate frame is connected with a top shell, and a servo motor I is mounted in the bottom shell through a mounting frame. The cutting device can be inserted only by drilling a small hole in a test rock mass, stress distribution change caused by a large opening is avoided, actual geological conditions are closer, the accuracy of experimental data is improved, the cutting component set can perform multi-angle rotary cutting, the shape and size of a karst cave can be flexibly adjusted, and karst cave structures of different scales can be accurately simulated.

Description

Technical Field

[0001] The invention relates to the technical field of shield construction, in particular to a shield cutter rock breaking test device for a shield machine passing through a karst cave. Background Art

[0002] During the tunneling process of the shield machine, small caves sometimes appear in front, and irregular pits will be formed on the excavation surface. This uneven excavation surface will impact the cutter, causing cutter damage and accelerated wear. Therefore, it is particularly important to establish a special model test device to simulate the working conditions of the shield machine when passing through small caves and study the changes in the force on the cutter during the whole process. The current test device simulates the working conditions of the cutter when encountering small caves, tests the force conditions and rock breaking efficiency of the cutter under uneven rock formations, and analyzes its wear resistance and collapse risk. The experimental results of this device can help engineers optimize the cutter design, reduce cutter damage caused by caves, and improve the construction efficiency and safety of the shield machine under complex geological conditions.

[0003] At present, before conducting a shield cutter test, a simulated cave needs to be opened in the intact test rock by a cutting device. The cutting device needs to open a larger opening in the test rock mass in order to cut a larger simulated cave inside the rock mass. However, most of the caves in reality are closed structures, usually with only a small number of entrances or exits. Due to the large opening in the test rock mass, it is impossible to simulate a closed cave structure close to the actual geological conditions. The large opening will cause the stress distribution inside the rock mass to change, making the experimental environment inconsistent with the actual working conditions, thereby affecting the accuracy of the experimental data. Summary of the invention

[0004] In order to overcome the above technical problems, the purpose of the present invention is to provide a shield cutter rock breaking test device for a shield machine passing through a cave, so as to solve the problem that the current test device mentioned in the above background technology cannot open a simulated cave with a small opening on the test rock mass.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a shield cutter rock breaking test device for a shield machine passing through a karst cave, comprising a test rock body, the test rock body being erected on the ground through a bracket, the bottom of the test rock body being provided with a driving lifting component group, a hole-opening component group, a cutting component group and an adjusting and locking component group, the driving lifting component group being used for driving and controlling the hole-opening component group or the cutting component group, the hole-opening component group being used for opening a hole in the test rock body, the cutting component group being used for cutting in the test rock body to form a simulated karst cave, the adjusting and locking component group being used for controlling the position of the cutting component group, and the driving lifting component group being used for driving and controlling the hole-opening component group or the cutting component group. The component group includes a bottom shell, the top of the bottom shell is connected to an intermediate plate frame, the top of the intermediate plate frame is connected to a top shell, a servo motor 1 is installed inside the bottom shell through a mounting frame, a working end of the servo motor 1 is connected to a gear 1, the gear 1 is meshed with a gear 2, a sleeve component is arranged inside the gear 2, a servo motor 2, a sleeve body, a screw component and a guide rod are arranged inside the sleeve component, one end of the guide rod is connected to an anti-slip guide ring, a lower guide cylinder is arranged outside the anti-slip guide ring, an end clamp is arranged at one end of the screw component, and a telescopic corrugated anti-fouling pipe is arranged outside the guide rod.

[0006] Preferably: the bottom of the bottom shell contacts the ground, the middle plate frame is connected to a working end of the servo motor through a bearing, the middle plate frame is connected to the casing member through a bearing, the gear 2 is fixedly connected to the casing member through a through hole, and the bottom of the casing member contacts the lower guide cylinder through a thrust bearing.

[0007] Preferably: the servo motor 2 is installed inside the shell part through a mounting frame, the servo motor 2 is connected to the sleeve body through an umbrella gear assembly, the sleeve body is connected to the shell part through a bearing, the sleeve body is connected to the screw rod part through a nut pair, the guide rod is connected between the end bracket and the anti-slip guide ring, the anti-slip guide ring is in sliding contact with the lower guide cylinder through a slide groove, the shell part is in sliding contact with the guide rod through a through hole, the shell part is provided with a through hole corresponding to the screw rod part, and one end of the screw rod part is fixedly connected to the end bracket.

[0008] Preferably: the hole-opening component group is provided with a lower mounting seat 1 and a rock hole-opening drill bit, the lower mounting seat 1 is connected to the rock hole-opening drill bit, the rock hole-opening drill bit is used to drill a hole in the test rock body, and the lower mounting seat 1 can be connected to the end bracket by bolts.

[0009] Preferably: the cutting component group includes a lower mounting seat 2, one end of the lower mounting seat 2 is in contact with a bottom adjusting rod, one end of the bottom adjusting rod is provided with a middle adjusting rod, a servo motor 3 is provided on the side of the middle adjusting rod, one end of the middle adjusting rod is provided with a top adjusting rod, a rock cutting drill bit is provided on the top adjusting rod, and a universal transmission flexible shaft is provided inside the middle adjusting rod.

[0010] Preferably: the lower mounting seat 2 can be connected to the end bracket by bolts, the middle adjusting rods are provided with 3, and the 3 middle adjusting rods are rotatably connected, the servo motor 3 is provided with 4, one of the servo motor 3 is installed on the side of the bottom adjusting rod through a mounting frame, and the working end of this servo motor 3 is connected to a middle adjusting rod, and the other 3 servo motors 3 are respectively installed on the sides of the 3 middle adjusting rods through mounting frames, the bottom adjusting rod and the middle adjusting rod are rotatably connected, the middle adjusting rod and the top adjusting rod are rotatably connected, the top adjusting rod is connected to the rock cutting drill bit through a bearing, the bottom adjusting rod, the middle adjusting rod and the top adjusting rod are all provided with through holes corresponding to the universal transmission flexible shaft, and one end of the universal transmission flexible shaft is connected to the lower mounting seat 2, and the other end of the universal transmission flexible shaft is connected to the rock cutting drill bit.

[0011] Preferably: the adjustment and locking component group includes a stabilizing ring, an expansion bolt is arranged inside the stabilizing ring, a pull ring is arranged at the bottom of the stabilizing ring, a cross bar is connected to the side of the pull ring, a guide frame is arranged outside the cross bar, a clamp is arranged inside the guide frame, a hanging ring is arranged on the guide frame, and a ring member and a threaded rod member are arranged at the bottom of the stabilizing ring.

[0012] Preferably: the stabilizing ring is connected to the bottom of the test rock body through expansion bolts, the stabilizing ring is provided with a through hole for avoiding the cutting component group, the cross bar is connected between the pull ring and the clamp, the cross bar is sleeved with a spring, and the spring is connected between the clamp and the guide frame, the cross bar is in sliding contact with the guide frame through the through hole, the clamp is in sliding contact with the guide frame through the slide groove, one end of the clamp is inserted into the bottom adjusting rod through the slot, the lifting ring is connected to the top of the guide frame, the lifting ring is in sliding contact with the stabilizing ring through the slide rail, the ring member is connected to the bottom of the stabilizing ring, the threaded rod is connected to the pull ring through threads, one end of the threaded rod is connected with a toothed gasket, and the ring member is in contact with the toothed gasket of the threaded rod through a matching toothed structure.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. Through the precise control of the hole-opening component group and the cutting component group, the device only needs to drill a small hole in the test rock mass to insert the cutting device, and no large-area hole is needed. This effectively avoids the stress distribution changes caused by large openings, thus being closer to the actual geological conditions and ensuring the closedness of the cave structure. By reducing the size of the opening of the rock mass, the internal stress of the rock mass remains closer to the natural state. Since there is no interference from the large opening, the stress distribution of the experimental rock mass is more similar to the conditions of the real cave, and the accuracy of the test data has been significantly improved;

[0015] 2. The cutting component group can perform multi-angle rotation cutting inside the test rock mass through the linkage of the servo motor and the adjusting rod. The shape and size of the simulated cave can be flexibly adjusted, and the cave structures of different shapes and sizes can be simulated more accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the device of the present invention when drilling a hole in the test rock body;

[0017] Figure 2 It is a structural schematic diagram of the connection between the hole opening component group and the driving lifting component group of the present invention;

[0018] Figure 3 It is a schematic diagram of the structure of the device of the present invention when cutting the test rock body to simulate the karst cave;

[0019] Figure 4 It is a two-dimensional structural schematic diagram of the cutting component group, the adjusting and locking component group and the driving and lifting component group of the present invention;

[0020] Figure 5 It is a three-dimensional structural schematic diagram of the cutting component group, the adjusting and locking component group and the driving and lifting component group of the present invention;

[0021] Figure 6 It is a schematic cross-sectional view of the cutting component group, the adjusting and locking component group and the driving and lifting component group of the present invention;

[0022] Figure 7 For the present invention Figure 6 The structural diagram at A in the middle;

[0023] Figure 8 It is a structural schematic diagram of the driving lifting component assembly of the present invention;

[0024] Fig. 9 It is a three-dimensional cross-sectional structural schematic diagram of the driving lifting component assembly of the present invention;

[0025] Fig.10 It is a schematic diagram of the structure inside the casing of the present invention;

[0026] Fig.11 It is a cross-sectional structural schematic diagram of the intersecting position of the adjusting locking component group, the cutting component group and the driving lifting component group of the present invention;

[0027] Fig.12 It is a three-dimensional structural schematic diagram of the interfacing position of the adjusting locking component group, the cutting component group and the driving lifting component group of the present invention;

[0028] Fig.13 It is a schematic structural diagram of the cutting component assembly of the present invention;

[0029] Fig.14 It is a schematic structural diagram of the middle adjusting rod part of the present invention.

[0030] In the figure: 05, test rock body; 01, driving lifting component group; 11, bottom shell; 12, middle plate frame; 13, top shell; 14, servo motor 1; 15, gear 1; 16, gear 2; 17, sleeve shell; 18, servo motor 2; 19, sleeve body; 110, lower guide cylinder; 111, screw rod; 112, guide rod; 113, anti-drop guide ring; 114, end bracket; 115, telescopic corrugated anti-fouling pipe; 02, opening component group; 21, lower Mounting seat one; 22, rock drilling drill bit; 03, cutting component group; 31, lower mounting seat two; 32, bottom adjustment rod; 33, middle adjustment rod; 34, servo motor three; 35, top adjustment rod; 36, rock cutting drill bit; 37, universal transmission flexible shaft; 04, adjustment locking component group; 41, stabilizing ring; 42, expansion bolt; 43, pull ring; 44, guide frame; 45, cross bar; 46, clamp; 47, lifting ring; 48, ring member; 49, threaded rod member. DETAILED DESCRIPTION

[0031] See also Figure 1-14 An embodiment of the present invention is as follows: a shield cutter rock breaking test device for a shield machine passing through a karst cave, comprising a test rock body 05, the test rock body 05 being erected on the ground through a bracket, the bottom of the test rock body 05 being provided with a driving lifting component group 01, a hole-opening component group 02, a cutting component group 03 and an adjusting and locking component group 04, the driving lifting component group 01 being used for driving and controlling the hole-opening component group 02 or the cutting component group 03, the hole-opening component group 02 being used for opening a hole in the test rock body 05, the cutting component group 03 being used for cutting in the test rock body 05 to form a simulated karst cave, the adjusting and locking component group 04 being used for controlling the position of the cutting component group 03, the driving lifting component group 01 comprising a bottom shell 11, a bottom shell 12 and a bottom shell 13. The top of the bottom shell 11 is connected to the middle plate frame 12, the top of the middle plate frame 12 is connected to the top shell 13, a servo motor 14 is installed inside the bottom shell 11 through a mounting frame, the working end of the servo motor 14 is connected to a gear 15, the gear 15 is meshed with a gear 2 16, a sleeve member 17 is arranged inside the gear 2 16, a servo motor 2 18, a sleeve body 19, a screw member 111 and a guide rod 112 are arranged inside the sleeve member 17, one end of the guide rod 112 is connected to an anti-slip guide ring 113, the outside of the anti-slip guide ring 113 is provided with a lower guide cylinder 110, one end of the screw member 111 is provided with an end bracket 114, and the outside of the guide rod 112 is provided with a telescopic corrugated anti-fouling pipe 115.

[0032] The bottom of the bottom shell 11 contacts the ground, the middle plate frame 12 is connected to the working end of the servo motor 14 through a bearing, the middle plate frame 12 is connected to the casing member 17 through a bearing, the gear 2 16 is fixedly connected to the casing member 17 through a through hole, and the bottom of the casing member 17 contacts the lower guide cylinder 110 through a thrust bearing.

[0033] The servo motor 2 18 is installed inside the casing 17 through a mounting frame. The servo motor 2 18 is connected to the sleeve body 19 through an umbrella gear assembly. The sleeve body 19 is connected to the casing 17 through a bearing. The sleeve body 19 is connected to the screw member 111 through a nut pair. The guide rod 112 is connected between the end bracket 114 and the anti-slip guide ring 113. The anti-slip guide ring 113 is in sliding contact with the lower guide cylinder 110 through a slide groove. The casing 17 is in sliding contact with the guide rod 112 through a through hole. The casing 17 is provided with a through hole corresponding to the screw member 111. One end of the screw member 111 is fixedly connected to the end bracket 114.

[0034] The hole-opening component group 02 is provided with a lower mounting seat 21 and a rock hole-opening drill bit 22, the lower mounting seat 21 and the rock hole-opening drill bit 22 are connected, the rock hole-opening drill bit 22 is used to drill holes in the test rock body 05, and the lower mounting seat 21 can be connected to the end bracket 114 by bolts.

[0035] The cutting component group 03 includes a lower mounting seat 2 31, one end of the lower mounting seat 2 31 contacts a bottom adjusting rod 32, one end of the bottom adjusting rod 32 is provided with a middle adjusting rod 33, a servo motor 34 is provided on the side of the middle adjusting rod 33, one end of the middle adjusting rod 33 is provided with a top adjusting rod 35, a rock cutting drill bit 36 ​​is provided on the top adjusting rod 35, and a universal transmission flexible shaft 37 is provided inside the middle adjusting rod 33.

[0036] The lower mounting seat 2 31 can be connected to the end bracket 114 by bolts, three middle adjusting rods 33 are provided, and the three middle adjusting rods 33 are rotatably connected to each other, four servo motors 34 are provided, one servo motor 34 is installed on the side of the bottom adjusting rod 32 through a mounting frame, and the working end of this servo motor 34 is connected to a middle adjusting rod 33, and the other three servo motors 34 are respectively installed on the sides of the three middle adjusting rods 33 through mounting frames, the bottom adjusting rod 32 and the middle adjusting rod 33 are rotatably connected, the middle adjusting rod 33 and the top adjusting rod 35 are rotatably connected, the top adjusting rod 35 is connected to the rock cutting drill bit 36 ​​through a bearing, the bottom adjusting rod 32, the middle adjusting rod 33 and the top adjusting rod 35 are all provided with through holes corresponding to the universal transmission flexible shaft 37, and one end of the universal transmission flexible shaft 37 is connected to the lower mounting seat 2 31, and the other end of the universal transmission flexible shaft 37 is connected to the rock cutting drill bit 36.

[0037] The adjustment and locking component group 04 includes a stabilizing ring 41, an expansion bolt 42 is arranged inside the stabilizing ring 41, a pull ring 43 is arranged at the bottom of the stabilizing ring 41, a cross bar 45 is connected to the side of the pull ring 43, a guide frame 44 is arranged outside the cross bar 45, a clamp 46 is arranged inside the guide frame 44, a hanging ring 47 is arranged on the guide frame 44, and a ring member 48 and a threaded rod member 49 are arranged at the bottom of the stabilizing ring 41.

[0038] The stabilizing ring 41 is connected to the bottom of the test rock body 05 through the expansion bolt 42. A through hole is opened on the stabilizing ring 41 to avoid the cutting component group 03. The cross bar 45 is connected between the pull ring 43 and the clamp 46. A spring is sleeved on the cross bar 45, and the spring is connected between the clamp 46 and the guide frame 44. The cross bar 45 slides in contact with the guide frame 44 through the through hole. The clamp 46 slides in contact with the guide frame 44 through the slide groove. One end of the clamp 46 is inserted into the bottom adjustment rod 32 through the slot. The lifting ring 47 is connected to the top of the guide frame 44. The lifting ring 47 slides in contact with the stabilizing ring 41 through the slide rail. The ring member 48 is connected to the bottom of the stabilizing ring 41. The threaded rod 49 is connected to the pull ring 43 through a thread. A toothed gasket is connected to one end of the threaded rod 49, and the ring member 48 contacts the toothed gasket of the threaded rod 49 through a matching toothed structure.

[0039] Working principle: Before conducting the shield cutter test, the rock to be tested is set on the ground through a bracket, and then the hole-opening component group 02 is installed on the end bracket 114, specifically, the lower mounting seat 21 is connected to the end bracket 114 through bolts, and then the driving lifting component group 01 and the hole-opening component group 02 are placed at the bottom of the test rock body 05, and the bottom of the driving lifting component group 01 is in contact with the ground, and the servo motor 18 in the driving lifting component group 01 is started by controlling the servo motor 18 to drive the sleeve body 19 to rotate through the bevel gear assembly, and the sleeve body 19 rotates to drive the screw rod through the nut pair. 111 rises, so that the screw rod 111, the guide rod 112, the anti-drop guide ring 113, the end bracket 114 and the hole-opening component group 02 can move upward together, so that the rock hole-opening drill bit 22 in the hole-opening component group 02 can contact the test rock body 05, and then the servo motor 14 is started, and the servo motor 14 drives the gear 15 through the working end, and the gear 15 drives the gear 2 16, the sleeve body 19 and the shell 17 to rotate, and finally drives the lower mounting seat 121 and the rock hole-opening drill bit 22 to rotate, and then cooperates with the servo motor 2 18 to vertically drill the test rock body 05. Figure 1 For the structure shown, the drilling depth is determined according to the actual required simulated cave size;

[0040] After the drilling of the test rock body 05 is completed, the driving lifting component group 01 is controlled to make the screw rod 111 descend and retract into the bottom shell 11, and the hole opening component group 02 is pulled out from the vertical hole of the test rock body 05. The driving lifting component group 01 is moved to move the driving lifting component group 01 out from the bottom of the test rock body 05, and the bolts between the lower mounting seat 21 and the end bracket 114 are screwed off, and the rock hole opening drill bit 22 and the lower mounting seat 21 are removed from the end bracket 114;

[0041] Place the stabilizing ring 41 at the bottom of the test rock body 05, and the axis of the stabilizing ring 41 and the axis of the hole of the test rock body 05 are at the same position. Fix the stabilizing ring 41 to the bottom of the test rock body 05 by the expansion bolt 42, and then control the screw rod 111 to fully retract it into the lower guide tube 110, so that the cutting component group 03 is inserted into the hole of the test rock body 05. Before insertion, pull the pull rings 43 on both sides to keep it away from the guide frame 44, and the spring on the cross bar 45 will accumulate force and shrink, and the clamp 46 will avoid the insertion of the cutting component group 03, and the cutting After the component group 03 is inserted into the appropriate position, the pull on the pull ring 43 is released, the spring releases the stored force and stretches, allowing the clamp 46 to be inserted into the slot on the lower mounting seat 2 31 or the bottom adjustment rod 32, completing the connection of the cutting component group 03, and then the end clamp 114 and the lower mounting seat 2 31 are placed on the same axis by moving the driving lifting component group 01, and then the guide rod 112 is controlled to rise and fall, so that the end clamp 114 is connected to the lower mounting seat 2 31 through bolts, and the servo motor 14 in the driving lifting component group 01 is started, which can drive The lower mounting seat 2 31 rotates, and the rotation of the lower mounting seat 2 31 drives the rock cutting drill bit 36 ​​to rotate through the universal transmission flexible shaft 37, so that the test rock body 05 can be cut by the rock cutting drill bit 36. The angles of the bottom adjustment rod 32, the middle adjustment rod 33 and the top adjustment rod 35 are changed by controlling the rotation of the servo motor 34 to adjust the angle of the rock cutting drill bit 36 ​​inside the test rock body 05. The toothed gasket at one end of the threaded rod 49 is released from contact with the toothed structure of the ring member 48 by rotating the threaded rod 49, so that the test rock body 05 can be cut by the rock cutting drill bit 36. The guide frame 44 and the lifting ring 47 rotate, which will drive the bottom adjusting rod 32 or the middle adjusting rod 33 to rotate. By coordinating with the servo motor 34 to rotate at an angle and driving the lifting component group 01 to move up and down, the purpose of cutting the inside of the test rock body 05 at multiple angles is achieved. Since the cutting component group 03 is inserted through the hole in the test rock body 05 to cut the inside of the test rock body 05, there is no need to open a large hole like in the prior art. The size of the hole only needs to ensure that the cutting component group 03 can be inserted into the test rock body 05.

Claims

1. A shield cutter rock breaking test device for a shield machine passing through a karst cave, comprising a test rock body, wherein the test rock body is erected on the ground through a bracket, Features: The bottom of the test rock body is provided with a driving and lifting component group, a hole-opening component group, a cutting component group and an adjusting and locking component group, the driving and lifting component group is used to drive and control the hole-opening component group or the cutting component group, the hole-opening component group is used to open a hole in the test rock body, the cutting component group is used to cut and form a simulated cave in the test rock body, and the adjusting and locking component group is used to control the position of the cutting component group, the driving and lifting component group includes a bottom shell, the top of the bottom shell is connected to an intermediate plate frame, the top of the intermediate plate frame is connected to a top shell, a servo motor 1 is installed inside the bottom shell through a mounting frame, a working end of the servo motor 1 is connected to a gear 1, the gear 1 is meshed with a gear 2, a sleeve member is provided inside the gear 2, a servo motor 2, a sleeve body, a screw member and a guide rod are provided inside the sleeve member, one end of the guide rod is connected to an anti-slip guide ring, the outside of the anti-slip guide ring is provided with a lower guide cylinder, one end of the screw member is provided with an end bracket, and the outside of the guide rod is provided with a telescopic corrugated anti-fouling pipe.

2. A shield cutter rock breaking test device for a shield machine passing through a karst cave according to claim 1, Features: The bottom of the bottom shell contacts the ground, the middle plate frame is connected to a working end of the servo motor through a bearing, the middle plate frame is connected to the casing member through a bearing, the gear 2 is fixedly connected to the casing member through a through hole, and the bottom of the casing member contacts the lower guide cylinder through a thrust bearing.

3. A shield cutter rock breaking test device for a shield machine passing through a karst cave according to claim 1, Features: The servo motor 2 is installed inside the casing part through a mounting frame, the servo motor 2 is connected to the sleeve body through an umbrella gear assembly, the sleeve body is connected to the casing part through a bearing, the sleeve body is connected to the screw rod part through a nut pair, the guide rod is connected between the end bracket and the anti-slip guide ring, the anti-slip guide ring is in sliding contact with the lower guide cylinder through a slide groove, the casing part is in sliding contact with the guide rod through a through hole, the casing part is provided with a through hole corresponding to the screw rod part, and one end of the screw rod part is fixedly connected to the end bracket.

4. A shield cutter rock breaking test device for a shield machine passing through a karst cave according to claim 1, Features: The hole-opening component group is provided with a lower mounting seat 1 and a rock hole-opening drill bit, the lower mounting seat 1 is connected to the rock hole-opening drill bit, the rock hole-opening drill bit is used to drill a hole in the test rock body, and the lower mounting seat 1 can be connected to the end bracket by bolts.

5. A shield cutter rock breaking test device for a shield machine passing through a karst cave according to claim 1, Features: The cutting component group includes a lower mounting seat 2, one end of which is in contact with a bottom adjusting rod, one end of the bottom adjusting rod is provided with a middle adjusting rod, a servo motor 3 is provided on the side of the middle adjusting rod, one end of the middle adjusting rod is provided with a top adjusting rod, a rock cutting drill bit is provided on the top adjusting rod, and a universal transmission flexible shaft is provided inside the middle adjusting rod.

6. A shield cutter rock breaking test device for a shield machine passing through a karst cave according to claim 5, Features: The second lower mounting seat can be connected to the end bracket by bolts, the middle adjusting rod is provided with a, and the middle adjusting rods are rotatably connected with each other, the third servo motor is provided with a, one servo motor three is installed on the side of the bottom adjusting rod through a mounting bracket, and the working end of the servo motor three is connected to a middle adjusting rod, and the other servo motors three are respectively installed on the sides of the middle adjusting rods through mounting brackets, the bottom adjusting rod and the middle adjusting rod are rotatably connected, the middle adjusting rod and the top adjusting rod are rotatably connected, the top adjusting rod is connected to the rock cutting drill bit through a bearing, the bottom adjusting rod, the middle adjusting rod and the top adjusting rod are all provided with through holes corresponding to the universal transmission flexible shaft, and one end of the universal transmission flexible shaft is connected to the second lower mounting seat, and the other end of the universal transmission flexible shaft is connected to the rock cutting drill bit.

7. A shield cutter rock breaking test device for a shield machine passing through a karst cave according to claim 1, Features: The adjustment and locking component group includes a stabilizing ring, an expansion bolt is arranged inside the stabilizing ring, a pull ring is arranged at the bottom of the stabilizing ring, a cross bar is connected to the side of the pull ring, a guide frame is arranged outside the cross bar, a clamp is arranged inside the guide frame, a hanging ring is arranged on the guide frame, and a ring member and a threaded rod member are arranged at the bottom of the stabilizing ring.

8. A shield cutter rock breaking test device for a shield machine passing through a karst cave according to claim 7, Features: The stabilizing ring is connected to the bottom of the test rock body through expansion bolts, a through hole is provided on the stabilizing ring to avoid the cutting component group, the cross bar is connected between the pull ring and the clamp, a spring is sleeved on the cross bar, and the spring is connected between the clamp and the guide frame, the cross bar is in sliding contact with the guide frame through the through hole, the clamp is in sliding contact with the guide frame through the slide groove, one end of the clamp is inserted into the bottom adjusting rod through the slot, the lifting ring is connected to the top of the guide frame, the lifting ring is in sliding contact with the stabilizing ring through the slide rail, the ring member is connected to the bottom of the stabilizing ring, the threaded rod is connected to the pull ring through threads, one end of the threaded rod is connected with a toothed gasket, and the ring member is in contact with the toothed gasket of the threaded rod through a matching toothed structure.

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