Water jet cantilever cutting mechanism and working method thereof

Abstract

The application discloses a water jet suspension cutting mechanism and a working method thereof, and relates to the technical field of tunnel boring devices.The water jet suspension cutting mechanism comprises a jet spraying device, a target distance adjusting mechanism and a nozzle protection cover, the relative rotation of the target distance adjusting mechanism and the nozzle protection cover drives the displacement of the nozzle, a jet target distance maintaining mechanism, a jet incidence angle adjusting mechanism, and a cutting track adjusting mechanism.The jet target distance maintaining mechanism comprises a main supporting arm and a vice supporting arm which are slidably connected, and a damping buffer rebound device which is connected with the end of the main supporting arm and the vice supporting arm, and the main supporting arm and the vice supporting arm are connected with the jet spraying device.The jet incidence angle adjusting mechanism drives the adjustment of the cutting angle of the nozzle through the extension and retraction of a servo hydraulic oil cylinder.The cutting track adjusting mechanism drives the vertical displacement of the jet incidence angle adjusting mechanism through the servo adjusting device and the sliding device displacement. The jet spraying device and the jet target distance maintaining mechanism guarantee that the jet cuts the rock at a fixed target distance. The jet incidence angle adjusting mechanism and the cutting track adjusting mechanism adjust the cutting angle, and realize the track cutting in different forms.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunneling devices, in particular to a water jet cantilever cutting mechanism and a working method thereof. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute the prior art.

[0003] As a direct rock breaking structure, the cutting head of the cantilever tunneling machine is usually equipped with cutting tools or picks, which have considerable rock breaking efficiency for rock with a strength of less than 100 MPa. However, when facing rock with higher strength and abrasive tools, there are problems such as slow tunneling speed and large tool wear, which affect the construction progress.

[0004] To solve the above problems, a new cutting technology is proposed to assist the cantilever tunneling machine in breaking rocks. High-pressure water jet has the advantages of high efficiency, low energy, and environmental protection, so it can be used to assist the cantilever tunneling machine in breaking rocks. Currently, the high-pressure water jet cantilever tunneling machine adopts the following scheme: the high-pressure water jet cutting nozzle is arranged on the cutting head of the cantilever tunneling machine, and the pump set is independent of the cantilever tunneling machine.

[0005] However, since the cutting head is in a rotating state during the rock breaking process, it is necessary to solve the transmission problem of "dynamic and static separation" of high-pressure water jet. The current high-pressure water rotary sealing transmission device has a complex structure and a limited service life. In addition, the vibration, scraping and impact of the cutting head during the rock breaking process will cause the high-pressure water jet nozzle on the cutting head to be easily damaged, thereby affecting the auxiliary rock breaking effect of the high-pressure water jet. Therefore, the current high-pressure water jet cantilever tunneling machine has problems such as high use cost, short continuous operation time of the tunneling machine, and long maintenance time.

[0006] Therefore, there is currently a lack of a water jet mechanism that can meet the efficient rock breaking of a double-cantilever water jet tunneling machine, which faces the following difficulties: (1) how to protect the nozzle from being impacted by obstacles such as rock surface and falling rocks when the water jet nozzle is mounted on the cantilever; (2) how to ensure efficient cutting of the high-pressure water jet on the uneven rock surface, considering that the jet target distance and incidence angle will affect the cutting effect. SUMMARY

[0007] To solve the above problems, the present application proposes a water jet cantilever cutting mechanism and a working method thereof. Through the jet injection device and the jet target distance maintaining mechanism, the jet is ensured to cut the rock at a fixed target distance. Through the jet incidence angle adjusting mechanism and the cutting trajectory adjusting mechanism, the cutting angle of the high-pressure cutting water jet and the high-pressure flushing water jet is adjusted, and the single cutting seam and parallel multi-cutting seam trajectory cutting of the high-pressure water jet in the form of "S", "Z", straight line, etc. can be realized.

[0008] To achieve the above object, the present application adopts the following technical solutions:

[0009] In a first aspect, the present application provides a water jet suspension cutting mechanism, comprising:

[0010] The jet spray device comprises a nozzle protection cover, a nozzle arranged in the nozzle protection cover, and a target distance adjusting mechanism connected with the nozzle protection cover and the nozzle, and the relative rotation of the target distance adjusting mechanism and the nozzle protection cover drives the nozzle to displace;

[0011] The jet target distance maintaining mechanism comprises a main support arm and a secondary support arm connected in sliding mode, and a damping buffer rebound device connected with the end of the main support arm and the secondary support arm, and the main support arm and the secondary support arm are connected with the jet spray device;

[0012] The jet incidence angle adjusting mechanism comprises a support frame connected with the main support arm, a mounting bottom plate connected with the support frame, and a servo hydraulic cylinder connected with the support frame and the mounting bottom plate, and the extension and retraction of the servo hydraulic cylinder drives the adjustment of the nozzle cutting angle;

[0013] The cutting track adjusting mechanism comprises a fixed side plate, a sliding device and a servo adjusting device arranged on the fixed side plate, the servo adjusting device is connected with the sliding device, the sliding device is connected with the mounting bottom plate, and the action of the servo adjusting device drives the displacement of the sliding device, thereby driving the vertical displacement of the jet incidence angle adjusting mechanism to adjust the nozzle cutting angle.

[0014] As an optional implementation, the nozzle comprises a flushing nozzle and a jet cutting nozzle, the target distance adjusting mechanism is connected with the nozzle protection cover through threads, and the relative displacement of the flushing nozzle and the jet cutting nozzle and the nozzle protection cover is caused by the rotation of the target distance adjusting mechanism and the nozzle protection cover, so as to adjust the target distance of the jet cutting nozzle and the flushing nozzle.

[0015] As an optional implementation, the nozzle protection cover is provided with a high-pressure cutting water jet outlet communicating with the jet cutting nozzle and a high-pressure flushing water jet outlet communicating with the flushing nozzle.

[0016] As an optional implementation, the front end of the nozzle protection cover is designed in a circular arc shape to fit the uneven rock surface.

[0017] As an optional implementation, the damping buffer rebound device is used to buffer the vibration caused by the nozzle protection cover driving the main support arm and the secondary support arm, and the main support arm and the secondary support arm are restored to the initial state through the rebound effect.

[0018] As an optional implementation, the extension and retraction of the servo hydraulic cylinder drives the lateral displacement of the jet target distance maintaining mechanism through the support frame, and then adjusts the nozzle cutting angle.

[0019] As an alternative embodiment, the sliding device comprises a sliding rail arranged on the fixed side plate, a sliding block arranged on the sliding rail, and a sliding side plate connected with the sliding block, the sliding side plate is connected with the mounting bottom plate, and the sliding side plate moves vertically along the sliding rail through the sliding block.

[0020] As an alternative embodiment, the servo adjusting device comprises a servo motor, a screw rod, a nut, and a support; the servo motor and the support are arranged on the fixed side plate, one end of the screw rod is connected with the servo motor, the other end of the screw rod is connected with the support, the nut is rotationally connected with the screw rod, and the nut is connected with the sliding side plate.

[0021] As an alternative embodiment, the servo motor drives the screw rod to rotate, the screw rod drives the nut to rotate, the nut is used for converting rotary motion into linear motion, thereby driving the sliding side plate to move vertically along the sliding rail through the sliding block, and then driving the vertical movement of the jet flow incidence angle adjusting mechanism, the vertical movement of the jet flow incidence angle adjusting mechanism drives the vertical displacement of the jet flow target distance maintaining mechanism, thereby adjusting the cutting angle of the nozzle.

[0022] In a second aspect, the present application provides a working method of the water jet suspension arm cutting mechanism in the first aspect, comprising:

[0023] The rock mass with fissures after the rock is broken by the flushing nozzle;

[0024] The cutting is performed on the flushed rock mass by the jet flow cutting nozzle, and the residual abrasive particles on the cut rock surface are washed by the flushing nozzle;

[0025] The relative displacement between the flushing nozzle, the jet flow cutting nozzle, and the nozzle protection cover is generated by the rotation of the target distance adjusting mechanism and the nozzle protection cover, thereby adjusting the target distance of the jet flow cutting nozzle and the flushing nozzle;

[0026] The horizontal displacement of the jet flow target distance maintaining mechanism is driven by the support frame through the extension and retraction movement of the servo hydraulic cylinder;

[0027] The rotation of the nut is driven by the screw rod through the action of the servo motor, the screw converts rotary motion into linear motion, thereby driving the sliding side plate to move vertically along the sliding rail through the sliding block, and then driving the vertical movement of the jet flow incidence angle adjusting mechanism, the vertical movement of the jet flow incidence angle adjusting mechanism drives the vertical displacement of the jet flow target distance maintaining mechanism, thereby adjusting the cutting angle of the high-pressure cutting water jet and the high-pressure flushing water jet.

[0028] In a third aspect, the present application provides a double-suspension-arm high-pressure water jet tunneling machine, comprising: the water jet suspension arm cutting mechanism in the first aspect and a tunneling machine body, and the water jet suspension arm cutting mechanism is arranged on the tunneling machine body.

[0029] Compared with the prior art, the present application has the following beneficial effects:

[0030] The present application provides a water jet cantilever cutting mechanism and its working method, which can maximize the rock breaking ability of high pressure water jet. By adjusting the target distance adjusting mechanism and the rotation of the nozzle protection cover, the relative displacement of the flushing nozzle and the jet cutting nozzle and the nozzle protection cover is generated, so that the target distance of the jet cutting nozzle and the flushing nozzle is adjusted, and the jet cutting rock with fixed target distance value is ensured. At the same time, the jet target distance maintaining mechanism is designed, when the nozzle protection cover moves on the uneven rock surface, the severe high frequency vibration generated by the nozzle protection cover driving the main support arm and the auxiliary support arm is weakened, and then the main support arm and the auxiliary support arm are quickly restored to the initial state through the rebound effect, so that the nozzle protection cover is attached to the rock surface, and finally the high pressure cutting water jet and the high pressure flushing water jet with fixed target distance value are realized on the rock surface.

[0031] The present application provides a water jet cantilever cutting mechanism and its working method, which designs a jet incidence angle adjusting mechanism, controls the extension and retraction of the servo hydraulic cylinder, drives the jet target distance maintaining mechanism to move horizontally through the support frame, and adjusts the cutting angle of the high pressure cutting water jet and the high pressure flushing water jet.

[0032] The present application provides a water jet cantilever cutting mechanism and its working method, which designs a cutting trajectory adjusting mechanism, controls the action of the servo motor, drives the nut to rotate through the screw rod, converts the rotary motion into linear motion, drives the sliding side plate to move vertically along the slide rail through the sliding block, and then drives the vertical movement of the jet incidence angle adjusting mechanism, the vertical movement of the jet incidence angle adjusting mechanism drives the vertical displacement of the jet target distance maintaining mechanism, and the trajectory cutting of single cutting seam and parallel multiple cutting seams of high pressure water jet in the form of "S shape", "Z shape" and straight line is realized.

[0033] The present application provides a water jet cantilever cutting mechanism and its working method, the nozzle protection cover can protect the jet cutting nozzle and the flushing nozzle, resist the damage of rock surface impact and rockfall impact, and the front end of the nozzle protection cover is designed as a circular arc shape, which can ensure the smooth movement of the nozzle protection cover on the uneven rock surface.

[0034] The present application provides a water jet cantilever cutting mechanism and its working method, which effectively removes the weak rock with cracks on the cutting rock surface of the tunneling machine through the flushing nozzle, improves the flatness of the jet cutting rock surface, ensures the effective cutting of hard and complete rock by high pressure water jet, and improves the utilization rate of the strong cutting ability of high pressure water jet. Moreover, the abrasive particles remaining on the rock surface and inside the cutting seam after cutting by high pressure abrasive water jet are effectively washed away, so as to avoid mechanical wear caused by contact with high hardness abrasive particles when the mechanical cutting head breaks rock.

[0035] Advantages of the additional aspects of the application will become apparent in the following description, which is given by way of example only, from the description and from the accompanying drawings, or can be learned from the practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from the provided drawings without creative labor.

[0037] Figure 1 The schematic diagram of the overall structure of the water jet cantilever cutting mechanism provided for the embodiment 1 of the present application is shown in the figure.

[0038] Figure 2 The cross-sectional view of the water jet spraying device provided for the embodiment 1 of the present application is shown in the figure.

[0039] Figure 3 The schematic diagram of the water jet target distance maintaining mechanism provided for the embodiment 1 of the present application is shown in the figure.

[0040] Figure 4 The schematic diagram of the water jet incidence angle adjusting mechanism provided for the embodiment 1 of the present application is shown in the figure.

[0041] Figure 5 The schematic diagram of the cutting track adjusting mechanism provided for the embodiment 1 of the present application is shown in the figure.

[0042] Figure 6 The side view of the cutting track adjusting mechanism provided for the embodiment 1 of the present application is shown in the figure.

[0043] Figure 7 The overall schematic diagram of the double-cantilever type high-pressure water jet tunneling machine provided for the embodiment 3 of the present application is shown in the figure.

[0044] In the figure, 1 is a water jet spraying device, 11 is a flushing nozzle, 12 is a water jet cutting nozzle, 13 is a nozzle protection cover, 14 is a target distance adjusting mechanism, 2 is a water jet target distance maintaining mechanism, 21 is a main support arm, 22 is a secondary support arm, 23 is a damping buffer rebound device, 3 is a water jet incidence angle adjusting mechanism, 31 is a support frame, 32 is a servo hydraulic cylinder, 33 is a mounting bottom plate, 4 is a cutting track adjusting mechanism, 41 is a fixed side plate, 42 is a sliding device, 43 is a servo adjusting device, 44 is a connecting base, 421 is a sliding rail, 422 is a sliding block, 423 is a sliding side plate, 431 is a servo motor, 432 is a screw rod, 433 is a nut, 434 is a support base, 5 is a high-pressure water jet cantilever, 6 is a mechanical cutting head cantilever, and 7 is a water jet cantilever cutting mechanism. DETAILED DESCRIPTION

[0045] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0046] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0047] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that the terms "include" and "comprise" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0048] In the absence of conflict, the embodiments of the present invention and the features thereof may be combined with each other.

[0049] Example 1

[0050] The water jet cantilever cutting mechanism provided in this embodiment can be mounted on a double-cantilever water jet tunnel boring machine, solving the problems of high cost, short continuous operation time, and long maintenance time in the existing technology. Figure 1 As shown, it includes: a jet injection device 1, a jet target distance maintaining mechanism 2, a jet incident angle adjustment mechanism 3, and a cutting trajectory adjustment mechanism 4.

[0051] In this embodiment, if Figure 2 As shown, the jet injection device 1 includes a flushing nozzle 11 , a jet cutting nozzle 12 , a nozzle protection cover 13 and a target distance adjustment mechanism 14 .

[0052] Specifically:

[0053] The flushing nozzle 11 and the jet cutting nozzle 12 are installed inside the nozzle protection cover 13 and are fixed to the target distance adjustment mechanism 14 .

[0054] The nozzle protection cover 13 is provided with a high-pressure cutting water jet outlet connected to the jet cutting nozzle 12 and a high-pressure flushing water jet outlet connected to the flushing nozzle 11, which can ensure that the jet is ejected from the cover body by the nozzle and acts on the excavation rock surface.

[0055] The target distance adjusting mechanism 14 is connected with the spray head protective cover 13 through thread connection, and by rotating the two, relative displacement between the flushing spray head 11, the jet cutting spray head 12 and the spray head protective cover 13 can be generated, so that the target distance of the jet cutting spray head 12 and the flushing spray head 11 can be adjusted.

[0056] As an alternative embodiment, the front end of the spray head protective cover 13 is designed as a circular arc shape, which can be attached to the uneven rock surface during operation, and the circular arc-shaped front end can ensure that the spray head protective cover 13 moves smoothly on the rock surface.

[0057] In this embodiment, the flushing spray head 11 and the jet cutting spray head 12 are combined to break the rock, and the flushing spray head 11 is used to flush the soft rock with cracks after the mechanical cutting head breaks the rock, so that the rock surface is smooth, and the jet cutting spray head of high-pressure water jet can cut the complete and hard rock with a higher probability.

[0058] The jet cutting spray head 12 cuts on the rock surface broken by the boring machine to form a series of prefabricated cutting joints and cracks. When the jet cutting spray head 12 sprays high-pressure abrasive water jet, the flushing spray head 11 can effectively flush the abrasive particles remaining on the rock surface and inside the cutting joint after high-pressure abrasive water jet cutting, so as to avoid mechanical wear caused by contact with high-hardness abrasive particles when the mechanical cutting head breaks the rock.

[0059] In this embodiment, as shown in Figure 3 The jet target distance maintaining mechanism 2 is connected with the jet spray device 1, and includes a main support arm 21, a secondary support arm 22 and a damping buffer rebound device 23.

[0060] Specifically:

[0061] The main support arm 21 and the secondary support arm 22 are respectively hingedly connected with the jet spray device 1.

[0062] The main support arm 21 is provided with a sliding groove, and one end of the secondary support arm 22 is installed in the sliding groove and can freely slide.

[0063] The damping buffer rebound device 23 is connected with the end portions of the main support arm 21 and the secondary support arm 22, and its function is to weaken the violent high-frequency vibration of the main support arm 21 and the secondary support arm 22 caused by the spray head protective cover 13 when the spray head protective cover 13 moves on the uneven rock surface, and at the same time, the rebounding action of the damping buffer rebound device 23 drives the main support arm 21 and the secondary support arm 22 to quickly recover to the initial state, so as to ensure that the spray head protective cover 13 is attached to the rock surface, and finally realize that the high-pressure cutting water jet and the high-pressure flushing water jet act on the rock surface with a fixed target distance value.

[0064] In this embodiment, as shown in Figure 4As shown, the jet incidence angle adjusting mechanism 3 comprises a support frame 31, a servo hydraulic cylinder 32 and a mounting base plate 33.

[0065] Specifically,

[0066] One end of the support frame 31 is fixedly connected with the main support arm 21 of the jet target distance maintaining mechanism 2, and the other end is hingedly connected with the mounting base plate 33, for supporting the jet spraying device 1 and the jet target distance maintaining mechanism 2.

[0067] Both ends of the servo hydraulic cylinder 32 are connected with the support frame 31 and the mounting base plate 33 respectively, and by controlling the extension and contraction movement of the servo hydraulic cylinder 32, the transverse displacement of the jet target distance maintaining mechanism 2 is driven by the support frame 31, and then the cutting angle of the high-pressure cutting water jet and the high-pressure flushing water jet is adjusted.

[0068] In the embodiment, as shown, Figures 5-6 The cutting trajectory adjusting mechanism 4 comprises a fixed side plate 41, a sliding device 42, a servo adjusting device 43 and a connecting base 44.

[0069] Specifically,

[0070] The fixed side plate 41 is fixedly connected with the connecting base 44, and the connecting base 44 is provided with a mounting hole, so that the whole water jet cantilever cutting mechanism can be directly connected with the cantilever of the double-cantilever high-pressure water jet tunneling machine.

[0071] The sliding device 42 comprises a sliding rail 421, a sliding block 422 and a sliding side plate 423.

[0072] The sliding rail 421 is fixed on the fixed side plate 41, the sliding block 422 is arranged on the sliding rail 421, the sliding side plate 423 is fixedly connected with the sliding block 422, and the sliding side plate 423 moves up and down along the sliding rail 421 through the sliding block 422; and the sliding side plate 423 is fixedly connected with the mounting base plate 33 of the jet incidence angle adjusting mechanism 3.

[0073] The servo adjusting device 43 comprises a servo motor 431, a screw rod 432, a nut 433 and a support 434.

[0074] The servo motor 431 and the support 434 are fixed on the fixed side plate 41, one end of the screw rod 432 is fixedly connected with the servo motor 431, and the other end of the screw rod 432 is connected with the support 434; the nut 433 is arranged on the screw rod 432 and can rotate relative to the screw rod 432; and the nut 433 is fixedly connected with the sliding side plate 423.

[0075] The specific working process is as follows: the servo motor 431 drives the screw rod 432 to rotate, the rotary motion is converted into linear motion through the nut 433, the sliding side plate 423 is driven to slide up and down, the sliding side plate 423 moves up and down along the slide rail 421 through the sliding block 422, and then the vertical movement of the jet incidence angle adjusting mechanism 3 is driven, the vertical movement of the jet incidence angle adjusting mechanism 3 drives the vertical displacement of the jet target distance maintaining mechanism 2, so that the cutting angle of the high-pressure cutting water jet and the high-pressure flushing water jet is adjusted.

[0076] In the embodiment, the cutting track adjusting mechanism 4 can control the up-and-down movement of the water jet when the water jet cuts transversely, so as to drive the water jet to cut in an "S-shaped", "zigzag", straight line and the like. In addition, the up-and-down movement of the cutting track adjusting mechanism 4 is matched with the horizontal movement of the tunneling machine boom, so that the water jet cutting parallel joint can be realized, thereby replacing the up-and-down movement of the tunneling machine boom and realizing accurate and rapid up-and-down adjustment.

[0077] Embodiment 2

[0078] The embodiment provides a working method of the water jet boom cutting mechanism in embodiment 1, which comprises the following steps:

[0079] The rock mass with cracks after being broken by the flushing nozzle;

[0080] The rock mass after being flushed is cut by the jet cutting nozzle, and the residual abrasive particles on the cut rock surface are washed by the flushing nozzle;

[0081] The relative displacement between the flushing nozzle and the jet cutting nozzle and the nozzle protection cover is generated by rotating the target distance adjusting mechanism and the nozzle protection cover, so that the target distance of the jet cutting nozzle and the flushing nozzle is adjusted;

[0082] The jet target distance maintaining mechanism is driven to move laterally by the support frame through the extension and retraction movement of the servo hydraulic cylinder;

[0083] The rotation of the nut is driven by the screw rod through the action of the servo motor, the rotary motion is converted into linear motion, the sliding side plate is driven to move vertically along the slide rail through the sliding block, then the vertical movement of the jet incidence angle adjusting mechanism is driven, the vertical displacement of the jet target distance maintaining mechanism is driven by the vertical movement of the jet incidence angle adjusting mechanism, so that the cutting angle of the high-pressure cutting water jet and the high-pressure flushing water jet is adjusted.

[0084] Embodiment 3

[0085] The embodiment provides a double-boom high-pressure water jet tunneling machine, which comprises the water jet boom cutting mechanism in embodiment 1 and a tunneling machine body.

[0086] As Figure 7As shown, the machine body of the tunneling machine has two cantilevers, which are a high-pressure water jet cantilever 5 and a mechanical cutting head cantilever 6; wherein the high-pressure water jet cantilever 5 is used to pre-damage rock mass on the excavation surface with high-pressure water jet; the mechanical cutting head cantilever 6 is used to mechanically break rocks on the jet pretreated rock surface;

[0087] The water jet cantilever cutting mechanism 7 is arranged on the high-pressure water jet cantilever 5 of the machine body of the tunneling machine, and specifically is connected with the high-pressure water jet cantilever 5 of the double-cantilever high-pressure water jet tunneling machine through the mounting holes arranged on the connecting base.

[0088] The above describes the specific embodiments of the present application in combination with the drawings, but is not a limitation on the protection scope of the present application, and those skilled in the art should understand that various modifications or changes made by those skilled in the art on the basis of the technical solutions of the present application without creative labor are still within the protection scope of the present application.

Claims

1. A water jet cantilever cutting mechanism, characterized in that: include: The jet injection device includes a nozzle protective cover, a nozzle arranged in the nozzle protective cover, and a target distance adjustment mechanism connected to the nozzle protective cover and the nozzle, wherein the relative rotation of the target distance adjustment mechanism and the nozzle protective cover drives the nozzle to move; The jet target distance maintaining mechanism includes a main support arm and a secondary support arm that are slidably connected, and a damping buffer rebound device connected to the ends of the main support arm and the secondary support arm, and the main support arm and the secondary support arm are both connected to the jet injection device; The jet incident angle adjustment mechanism includes a support frame connected to the main support arm, a mounting base connected to the support frame, and a servo hydraulic oil cylinder connected to the support frame and the mounting base. The extension and contraction of the servo hydraulic oil cylinder drives the adjustment of the nozzle cutting angle. The cutting trajectory adjustment mechanism includes a fixed side plate and a sliding device and a servo adjustment device provided on the fixed side plate. The servo adjustment device is connected to the sliding device, and the sliding device is connected to the mounting base plate. The movement of the servo adjustment device drives the displacement of the sliding device, thereby driving the vertical displacement of the jet incidence angle adjustment mechanism to adjust the cutting angle of the nozzle; The nozzles include a flushing nozzle and a jet cutting nozzle. The target distance adjustment mechanism is connected to the nozzle protection cover by a thread. By rotating the target distance adjustment mechanism and the nozzle protection cover, the flushing nozzle and the jet cutting nozzle are relatively displaced from the nozzle protection cover, thereby adjusting the target distance between the jet cutting nozzle and the flushing nozzle. The nozzle protection cover is provided with a high-pressure cutting water jet outlet connected to the jet cutting nozzle and a high-pressure flushing water jet outlet connected to the flushing nozzle; The front end of the nozzle protection cover is designed to be arc-shaped so as to fit the uneven rock surface.

2. A water jet cantilever cutting mechanism according to claim 1, characterized in that: The damping buffer rebound device is used to buffer the vibration generated by the nozzle protection cover driving the main support arm and the auxiliary support arm, and to drive the main support arm and the auxiliary support arm to return to their initial state through rebound action.

3. The water jet cantilever cutting mechanism according to claim 1, characterized in that: The telescopic movement of the servo hydraulic cylinder drives the jet target distance maintaining mechanism to move horizontally through the support frame, thereby adjusting the nozzle cutting angle.

4. The water jet cantilever cutting mechanism according to claim 1, characterized in that: The sliding device includes a slide rail arranged on the fixed side plate, a slider arranged on the slide rail and a slide side plate connected to the slider. The slide side plate is connected to the installation base plate, and the slide side plate moves vertically along the slide rail through the slider.

5. A water jet cantilever cutting mechanism as claimed in claim 4, characterized in that: The servo adjustment device includes a servo motor, a screw, a nut and a support; the servo motor and the support are arranged on the fixed side plate, one end of the screw is connected to the servo motor, the other end of the screw is connected to the support, the nut is rotationally connected to the screw, and the nut is connected to the sliding side plate.

6. A water jet cantilever cutting mechanism according to claim 5, characterized in that: The servo motor drives the screw to rotate, and the screw drives the nut to rotate. The nut is used to convert the rotational motion into linear motion, thereby driving the sliding side plate to move vertically along the slide rail through the slider, and then driving the vertical movement of the jet incidence angle adjustment mechanism. The vertical movement of the incidence angle adjustment mechanism drives the vertical displacement of the jet target distance maintaining mechanism, thereby adjusting the nozzle cutting angle.

7. A method for operating the water jet cantilever cutting mechanism according to any one of claims 1 to 6, characterized in that: include: Use the scouring nozzle to scour the rock mass with cracks after breaking the rock; Cutting is performed on the scour rock mass by using a jet cutting nozzle, and residual abrasive particles on the cut rock surface are flushed by using a scouring nozzle; By rotating the target distance adjustment mechanism and the nozzle protection cover, the flushing nozzle, the jet cutting nozzle and the nozzle protection cover are relatively displaced, thereby adjusting the target distance between the jet cutting nozzle and the flushing nozzle; By controlling the telescopic movement of the servo hydraulic cylinder, the jet target distance maintaining mechanism is driven to move laterally through the support frame; By controlling the action of the servo motor, the nut is driven to rotate through the screw, and the screw converts the rotary motion into linear motion, thereby driving the sliding side plate to move vertically along the slide rail through the slider, and then driving the vertical movement of the jet incidence angle adjustment mechanism. The vertical movement of the incidence angle adjustment mechanism drives the vertical displacement of the jet target distance maintaining mechanism, thereby adjusting the cutting angle of the high-pressure cutting water jet and the high-pressure flushing water jet.

8. A double-cantilever high-pressure water jet boring machine, characterized in that: include: The water jet cantilever cutting mechanism and the tunnel boring machine body according to any one of claims 1 to 6, wherein the water jet cantilever cutting mechanism is arranged on the tunnel boring machine body.

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