A water jet cutting system carried by a high-pressure water jet tunneling machine

Abstract

The application relates to the technical field of tunnel excavation, and provides a water jet cutting system carried by a high-pressure water jet tunneling machine, which comprises a water jet rotary joint fixed end, a water jet rotary joint rotating end, a low-pressure medium rotary center fixed end and a low-pressure medium rotary center rotating end, the water jet rotary joint rotating end and the low-pressure medium rotary center rotating end rotate synchronously with a combined cutter head; a high-pressure water transmission pipeline is arranged on the central axis of the low-pressure medium rotary center rotating end, the water jet rotary joint fixed end, the water jet rotary joint rotating end and the high-pressure water transmission pipeline are sequentially connected; the fixed end is sleeved outside the rotating end; a plurality of annular grooves are arranged on the inner side of the fixed end, one low-pressure medium input hole is arranged on each annular groove; a plurality of low-pressure medium transmission pipelines are arranged in the rotating end, each low-pressure medium transmission pipeline is connected with one annular groove; the water jet cutting system is convenient to seal; the above parts, a pump group, a monitoring device, a combined cutter and the like jointly form the water jet cutting system.

Description

Technical Field

[0001] This invention relates to the field of tunnel boring technology, and in particular to a water jet cutting system mounted on a high-pressure water jet tunnel boring machine. Background Technology

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

[0003] Common tunnel excavation methods are mainly divided into drill-and-blast method and tunnel boring machine (TBM) construction method. Drill-and-blast tunnel construction has a low degree of mechanization, relies on manual excavation and blasting, resulting in high labor intensity, slow construction speed, and a tendency to reduce the stability of the surrounding rock, leading to frequent personnel injuries and fatalities. TBM construction method, on the other hand, has a high degree of mechanization. When excavating ordinary hard rock tunnels, the construction speed can reach 3-10 times that of the drill-and-blast method, resulting in high construction efficiency, high construction quality, and a safer working environment. However, when full-face tunnel boring machines are excavating in extremely complex geological conditions such as hard rock, ultra-hard rock, and highly abrasive strata, problems such as excessive cutter resistance, severe cutter wear and damage, and difficulty in breaking hard rock arise, leading to increased construction costs and severely restricting on-site construction efficiency.

[0004] To enhance the rock-breaking capabilities of full-face tunnel boring machines (TBMs), various novel rock-breaking methods have been proposed. Among them, high-pressure water jet technology, characterized by its cleanliness, environmental friendliness, low energy consumption, high efficiency, and ease of implementation, along with a rich practical foundation, is considered a highly promising rock-breaking method. Its application to the rock-breaking field of TBMs represents a significant innovation in TBM technology development. Utilizing abrasive water jet-assisted cutterhead rock breaking can increase the penetration depth of the mechanical cutter, significantly reduce the cutter load, extend cutter life, substantially improve tunneling efficiency, reduce mechanical wear, and improve the working environment at the face.

[0005] Existing rotary cutting centers primarily rely on negative pressure adsorption for abrasive supply, which uses high-pressure water to create negative pressure and draw abrasive from the transfer abrasive box. However, this method has limitations, leading to unstable supply and uncontrollable abrasive volume, resulting in several problems. For example, when the water jet is at the top of the cutter head, gravity makes it difficult to draw out the abrasive, resulting in low or no abrasive output; conversely, when it's at the bottom, gravity makes it easier to draw out the abrasive, resulting in high output. In conclusion, due to the unstable and uncontrollable abrasive volume, the negative pressure adsorption method is ineffective.

[0006] Furthermore, the pressure of high-pressure water media can typically reach several hundred megapascals, while the pressure of other transmission media is generally less than ten megapascals. This significant pressure difference means that current rotary centers often overlook the substantial gap in sealing requirements, failing to achieve true sealing design. Additionally, components such as water jet pump sets, combined cutterheads, and monitoring systems are not yet fully developed. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a waterjet cutting system for high-pressure waterjet tunneling machines. It fully considers the pressure differences between high-pressure water and other media, noting that excessive pressure differences lead to significant differences in sealing levels. To facilitate sealing, a waterjet rotary joint for rotating high-pressure water and a low-pressure medium rotation center for rotating other media are proposed. The waterjet rotary joint is positioned along the axis of the low-pressure medium rotation center, and this combination facilitates a true sealing design. Furthermore, considering the unstable and uncontrollable sand supply, an active sand supply and control device is proposed to achieve quantitative sand supply, thus optimizing the sand supply effect.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] The first aspect of the present invention provides a waterjet cutting system mounted on a high-pressure waterjet tunneling machine.

[0010] A waterjet cutting system mounted on a high-pressure waterjet tunneling machine includes a fixed end of a waterjet rotary joint, a rotating end of a waterjet rotary joint, a fixed end of a low-pressure medium rotation center, and a rotating end of a low-pressure medium rotation center, wherein the rotating end of the waterjet rotary joint, the rotating end of the low-pressure medium rotation center, and the combined cutterhead rotate synchronously.

[0011] A high-pressure water transmission pipe is provided on the central axis of the rotating end of the low-pressure medium rotation center. The fixed end of the water jet rotary joint, the rotating end of the water jet rotary joint, and the high-pressure water transmission pipe are connected in sequence for rotating and transmitting high-pressure water to the combined cutting tool.

[0012] The fixed end of the low-pressure medium rotation center is sleeved on the outside of the rotating end of the low-pressure medium rotation center; several annular grooves are opened on the inner side of the fixed end of the low-pressure medium rotation center, and a low-pressure medium input hole is opened on each annular groove; several low-pressure medium transmission pipes are arranged inside the rotating end of the low-pressure medium rotation center, and the first end of each low-pressure medium transmission pipe is connected to an annular groove, and the second end of the low-pressure medium transmission pipe is connected to each of the combined cutting tools on the combined cutting disc.

[0013] Furthermore, it also includes an ultra-high pressure, ultra-high flow pump unit driven by a variable frequency motor with progressively adjustable speed, installed on a trailer;

[0014] The ultra-high pressure and ultra-high flow pump set includes a housing and a pilot-operated overflow valve. The top of the housing has a pump inlet and the bottom of the housing has an outlet, which is connected to the pilot-operated overflow valve. The pilot-operated overflow valve is connected to the fixed end of the water jet rotary joint through a high-pressure water transmission pipeline.

[0015] Furthermore, the pilot-operated relief valve is energized and unloaded before the ultra-high pressure and ultra-high flow pump group is started; the pilot-operated relief valve is de-energized and loaded when the ultra-high pressure and ultra-high flow pump group reaches the preset pressure and flow value.

[0016] Furthermore, the top of the housing is provided with a pump inlet for dyeing agent, and a stirring rod is provided inside the housing.

[0017] Furthermore, the combined cutting tool includes a shell cutter, a waterjet cutter head, and a cushioning material;

[0018] The shell cutter has a groove inside, the water jet cutter head is embedded in the groove of the shell cutter, and the gap between the shell cutter and the water jet cutter head is filled with buffer material.

[0019] Furthermore, the combined cutting tool is arranged at the concentric circle where the forward hob is located, or the combined cutting tool is arranged between the concentric circles where the side hob is located.

[0020] Furthermore, the high-pressure water transmission pipeline is connected to the combined cutting tool in sequence through a diversion valve block, a water switch, and a water jet water supply line, and a high-pressure water pressure gauge is installed on the water jet water supply line.

[0021] Furthermore, it also includes a transfer sand box fitted outside the rotating end of the low-pressure medium rotation center, forming an abrasive storage space between the rotating end of the low-pressure medium rotation center and the transfer sand box;

[0022] The rotating end of the low-pressure medium rotary center is equipped with several abrasive transmission pipes. One end of each abrasive transmission pipe is connected to the abrasive storage space, and the other end is connected to the combined cutting tool.

[0023] Furthermore, the abrasive transmission pipeline is connected to the combined cutting tool via a water jet sand delivery pipeline, and a coil induction component connected to the wireless transmission module is provided on the outside of the water jet sand delivery pipeline.

[0024] Furthermore, a plurality of spiral blades are provided in the abrasive storage space, and the spiral blades are fixed on the rotating end of the low-pressure medium rotation center; the spiral blades rotate with the rotating end of the low-pressure medium rotation center to push the abrasive into the abrasive transmission pipeline, and the conveying speed and conveying amount of abrasive into the abrasive transmission pipeline are changed by adjusting the arc angle and spacing of the spiral blades.

[0025] A second aspect of the present invention provides a tunneling machine.

[0026] A tunneling machine employs a waterjet cutting system mounted on a high-pressure waterjet tunneling machine as described in the first aspect.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. The water jet cutting system mounted on a high-pressure water jet tunneling machine as described in this invention fully considers the pressure difference between high-pressure water medium (generally greater than tens of megapascals) and other media (generally less than ten megapascals). Excessive pressure difference leads to a huge difference in the sealing level between the two. To facilitate sealing and other designs, a water jet rotary joint for rotating and transmitting high-pressure water and a low-pressure medium rotary center for rotating and transmitting other media are proposed. The water jet rotary joint is placed on the axis of the low-pressure medium rotary center. The combination of the two constitutes a miniaturized and integrated multi-media rotary center that can simultaneously rotate and transmit the media required by the tunneling machine and the media required by the high-pressure water jet system, which facilitates the realization of true sealing design.

[0029] 2. The water jet cutting system mounted on the high-pressure water jet tunneling machine of the present invention uses a variable frequency motor with adjustable speed for its ultra-high pressure and ultra-high flow pump group. At the same time, a pilot-operated overflow valve is installed at the outlet of the ultra-high pressure and ultra-high flow pump group. Before the ultra-high pressure and ultra-high flow pump group is started, the pilot-operated overflow valve is energized and unloaded. When the ultra-high pressure and ultra-high flow pump group reaches the preset pressure and flow value, the pilot-operated overflow valve is de-energized and reloaded. This not only greatly reduces the pressure fluctuation during the pump group start-up process, but also protects the various components from damage. While ensuring the rock breaking and pile cutting effect, it further reduces the construction risk.

[0030] 3. The water jet cutting system mounted on the high-pressure water jet tunneling machine of the present invention has a dyeing agent inlet on the shell of the ultra-high pressure and ultra-high flow pump group. The dyeing agent is introduced into the shell. The shell is equipped with a stirring rod, which can quickly mix the dyeing agent and water. The dyeing agent mixture leaves colored residues at the broken or leaking points of hoses, rigid pipes, and high-pressure pipe joints, which facilitates timely detection and discovery of leaks and avoids further pipeline rupture and joint disconnection, which could cause personal injury and equipment damage.

[0031] 4. The water jet cutting system mounted on a high-pressure water jet tunneling machine as described in this invention embeds a water jet cutter head within a shell cutter as a combined water jet-shell cutter. The combined cutter not only has the original scraping function of the shell cutter but also effectively protects the water jet cutter head. Furthermore, to further improve the reliability and service life of the combined cutter, buffer material is filled in the pores between the water jet cutter head and the shell cutter, greatly reducing the damage to the water jet cutter head caused by rock-breaking vibration.

[0032] 5. The water jet cutting system mounted on a high-pressure water jet tunneling machine as described in this invention fully considers the stress, rock-breaking efficiency, and service life of the cutters at different positions on the combined cutterhead. Considering that the spacing between the forward cutters is larger and the stress on the cutters is significantly higher than in other positions, the water jet cutter head is arranged along the same trajectory as the forward cutter head to improve the stress on the cutters. Considering that the stress on the cutters at the edge positions is relatively smaller, the water jet cutter head is arranged along a different trajectory than the edge cutter head to improve the overall rock-breaking efficiency of the cutterhead.

[0033] 6. The water jet cutting system of the high-pressure water jet tunneling machine described in this invention fully considers the problem that the working status of the water jet mounted on the cutterhead of the tunneling machine cannot be obtained in real time and the location of the damaged water jet cannot be accurately located. A high-pressure water pressure gauge is installed on the water jet supply pipeline. When the water jet leaks or is damaged in other abnormal ways, the pressure at the water jet will drop rapidly. The working status of the water jet can be fed back in real time through the pressure gauge.

[0034] 7. The waterjet cutting system for a high-pressure waterjet tunneling machine described in this invention fully considers the problem of the inability of traditional rotary centers to accurately control the sand supply. It proposes an active sand control device including helical blades and a sand conveying chamber. The abrasive storage space formed between the rotating end of the low-pressure medium rotary center and the transfer sand box is used as the sand conveying chamber. The helical blades are set on the rotating end of the low-pressure medium rotary center. The rotation of the rotating end drives the helical blades to rotate, thereby continuously transporting the abrasive towards the cutterhead. At the same time, by adjusting the spacing and arc angle of the helical blades, the abrasive can be input into the system with a precise amount. This improves the traditional rotary center and solves the problem of unstable and uncontrollable sand supply in high-pressure waterjet cutting systems.

[0035] 8. The waterjet cutting system mounted on a high-pressure waterjet tunneling machine of the present invention has a coil induction component installed outside the waterjet sand delivery pipeline. To detect whether the sand pipe is discharging sand normally, small steel balls are thoroughly mixed with abrasive before sand is added to the sand inlet. When the sand pipe is discharging sand normally, the small steel balls pass through the induction coil component, thereby causing a change in the inductive reactance of the coil inside the coil induction component. The wireless transmission module is used to capture the change in the inductive reactance of the coil induction component and convert the change in inductive reactance into a detection signal whose frequency changes with the inductive reactance, which is wirelessly transmitted to the terminal. When the frequency increases, it indicates that the abrasive supply flow rate mixed with small steel balls is large; when the frequency decreases, it indicates that the abrasive supply flow rate mixed with small steel balls is small.

[0036] 9. The water jet cutting system mounted on a high-pressure water jet tunneling machine as described in this invention has made multiple adjustments and optimizations to the component design and spatial arrangement based on existing problems, thereby improving the working effect of the water jet cutting system. Attached Figure Description

[0037] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention and do not constitute an improper limitation of the invention.

[0038] Figure 1 This is a structural diagram of the water jet cutting system mounted on the high-pressure water jet tunneling machine according to Embodiment 1 of the present invention;

[0039] Figure 2 This is a schematic diagram of the ultra-high pressure and ultra-large flow pump unit of Embodiment 1 of the present invention;

[0040] Figure 3(a) is an external view of the multi-media rotary center structure of Embodiment 1 of the present invention;

[0041] Figure 3(b) is a cross-sectional view of the multi-media rotation center structure of Embodiment 1 of the present invention;

[0042] Figure 4 This is a cross-sectional view of the active sand supply device according to Embodiment 1 of the present invention;

[0043] Figure 5(a) is an external view of the water jet-shell cutter combined tool structure of Embodiment 1 of the present invention;

[0044] Figure 5(b) is a cross-sectional view of the water jet-shell cutter combined tool structure of Embodiment 1 of the present invention;

[0045] Figure 6 This is a schematic diagram of the water jet-mechanical combined cutterhead structure of Embodiment 1 of the present invention. Detailed Implementation

[0046] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0047] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0048] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0049] In this invention, terms such as "upper," "lower," "left," "right," "front," "back," "vertical," "horizontal," "side," and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only to facilitate the description of the structural relationships of the various components or elements of this invention and do not specifically refer to any component or element in this invention. They should not be construed as limiting the invention.

[0050] In this invention, terms such as "fixed connection," "connected," and "linked" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can determine the specific meaning of these terms in this invention based on the specific circumstances, and they should not be construed as limitations on the invention.

[0051] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0052] Example 1

[0053] Embodiment 1 of the present invention provides a water jet cutting system mounted on a high-pressure water jet tunneling machine.

[0054] This embodiment provides a waterjet cutting system mounted on a high-pressure waterjet tunneling machine, such as... Figure 1 As shown, it includes: 2. Ultra-high pressure and ultra-high flow pump set; 3. High pressure water transmission pipeline; 4. Multi-media rotary center; 5. Water jet diversion valve block; 6. Water jet-shell cutter combined tool (hereinafter referred to as combined tool); 7. Water jet-mechanical combined cutter head (hereinafter referred to as combined cutter head); 8. Water switch.

[0055] like Figure 1 As shown, considering the tunnel spatial layout, the ultra-high pressure ultra-high flow pump unit 2 is placed on a trailer section 1 of the full-face tunnel boring machine. The ultra-high pressure ultra-high flow pump unit 2 is the high-pressure water generator required by the high-pressure water jet cutting system. It is driven by a variable frequency motor with adjustable speed, which can control and adjust parameters such as pressure and flow as needed. At the same time, a pilot-operated overflow valve 24 is installed at the outlet of the ultra-high pressure ultra-high flow pump unit 2, which greatly reduces the pressure fluctuation during the start-up process of the ultra-high pressure ultra-high flow pump unit 2. The high-pressure water generated by the ultra-high pressure ultra-high flow pump unit 2 is transmitted to the multi-media rotary center 4 through the high-pressure water transmission pipeline 3, and then transmitted to each water switch 8 through the water jet diversion valve block 5, and finally transmitted to the water jet-shell cutter combined cutter 6.

[0056] like Figure 2As shown, the ultra-high pressure and ultra-high flow pump set 2 includes a housing and a pilot-operated overflow valve 24. The top of the housing has a pump inlet 21 and a dye inlet 22. The inside of the housing is equipped with a stirring rod 23. The bottom of the housing has an outlet, which is connected to the pilot-operated overflow valve 24. The pilot-operated overflow valve 24 is connected to the high-pressure water transmission pipeline 3.

[0057] like Figure 1 and Figure 2 As shown, the ultra-high pressure, ultra-high flow rate pump unit 2 is driven by a variable frequency motor with progressively adjustable speed, and a pilot-operated relief valve 24 is installed at the pump unit outlet. Before starting the ultra-high pressure, ultra-high flow rate pump unit 2, the pilot-operated relief valve 24 is energized to unload. When the ultra-high pressure, ultra-high flow rate pump unit 2 reaches the preset pressure and flow rate values, the pilot-operated relief valve 24 is de-energized and reloaded. The entire control system can not only greatly reduce pressure fluctuations during the startup process of the ultra-high pressure, ultra-high flow rate pump unit 2, but also protect various components from damage, further reducing construction risks while ensuring rock breaking and pile cutting effects.

[0058] As shown in Figures 3(a) and 3(b), the multi-media rotary center 4 is the core device of the high-pressure water jet cutting system, which can solve the "bottleneck" problem of dynamic and static separation between the rotation of the water jet-mechanical combined cutter head 7 and the static pipeline at the transmission point of the ultra-high pressure and ultra-large flow pump group 2.

[0059] As shown in Figures 3(a) and 3(b), the multi-media rotary center 4 consists of a water jet rotary joint 41, a low-pressure media transmission system, and an abrasive transmission system. The water jet rotary joint 41 is used to rotaryly transmit high-pressure water to the combined cutting tool. The low-pressure media transmission system is used to rotaryly transmit other low-pressure media, such as low-pressure water, foam / bentonite, abrasive, high-pressure gas, etc.

[0060] like Figure 1As shown in Figures 3(a) and 3(b), the high-pressure water transmission system mainly consists of an ultra-high pressure, ultra-high flow pump set 2, a high-pressure water transmission pipeline 3, a water jet rotary joint 41, a water jet diversion valve block 5, a water switch 8, and a water jet-shell cutter combined tool 6. The ultra-high pressure, ultra-high flow pump set 2 is the high-pressure water generating device, and the generated high-pressure water flows into the water jet rotary joint 41 through the high-pressure water transmission pipeline 3. The water jet rotary joint 41 includes a fixed end 411 and a rotating end 412. The fixed end 411 is fixedly connected to the low-pressure medium rotation center fixed end 421, and the rotating end 412 is threadedly connected to the low-pressure medium rotation center rotating end 422. The high-pressure water transmission pipeline 3 is directly connected to the fixed end 411 of the water jet rotary joint. High-pressure water transmitted through the pipeline 3 flows into the fixed end 411 and out through the rotating end 412, achieving dynamic and static separation of the pipeline. Subsequently, the high-pressure water flowing out from the rotating end 412 of the water jet rotary joint flows out through the central hole of the low-pressure medium rotation center 42 and connects to the water jet diversion valve block 5. The high-pressure water is then divided into multiple media streams and transmitted to the water switch 8, and finally to the multiple water jet-shell cutter joints 6 located at the cutter head position. This completes the dynamic and static separation transmission of high-pressure water from the ultra-high pressure, ultra-high flow pump unit 2 to the water jet-shell cutter joints 6. It should be noted that steel plates are welded along the pipeline and at the cutter nozzle connection points for protection, and observation doors are provided to protect people and objects inside the soil chamber. Multiple effective methods and facilities ensure the safe transmission of high-pressure water jets. The water jet-mechanical combined cutterhead 7 directly participates in rock breaking during tunnel excavation. In order to reduce the stress on the cutter and improve the rock breaking efficiency, the design of the water jet-mechanical combined cutterhead 7 fully considers the spatial position influence of the water jet-shell cutter combined cutter 6, and finally obtains a new type of high-efficiency rock breaking cutterhead that balances the stress on the cutter and the rock breaking energy consumption.

[0061] As shown in Figures 3(a) and 3(b), the low-pressure medium transmission system mainly consists of a low-pressure medium inlet 45, a low-pressure medium rotation center 42, and a low-pressure medium transmission pipeline 46. The low-pressure medium rotation center 42 includes a fixed end 421 and a rotating end 422. The fixed end 421 is a hollow cylinder, and the rotating end 422 is cylindrical. The fixed end 421 is fitted onto the outside of the rotating end 422, with a sealing ring between them allowing relative rotation. The fixed end 421 remains stationary. A cutter head connector 47 is fixedly installed at the end of the rotating end 422 near the cutter head, which is used to fix the rotating end 422 and the cutter head.

[0062] A low-pressure medium inlet 45 is located at the fixed end 421 of the low-pressure medium rotation center and is used to input external low-pressure media, such as low-pressure water, foam / bentonite, high-pressure gas, etc. A low-pressure medium transmission pipe 46 is located inside the rotating end 422 of the low-pressure medium rotation center and is used to output the low-pressure media flowing through the low-pressure medium rotation center 42.

[0063] Specifically, several annular grooves are formed on the inner side of the fixed end 421 of the low-pressure medium rotation center, and a low-pressure medium input hole 45 is formed on each annular groove; several low-pressure medium transmission pipes 46 are arranged inside the rotating end 422 of the low-pressure medium rotation center, the first end of each low-pressure medium transmission pipe 46 is connected to an annular groove, the second end of the low-pressure medium transmission pipe 46 is connected to a diversion valve, and the diversion valve is connected to the connecting combined tool and / or combined tool disc.

[0064] Specifically, low-pressure media such as external low-pressure cooling water, foam / bentonite, abrasive, and high-pressure gas are input through the low-pressure media inlet 45 into the annular groove of the fixed end 421 of the low-pressure media rotation center, and then flow through the low-pressure media transmission pipe 46 located inside the rotating end 422 of the low-pressure media rotation center, achieving dynamic and static separation of the pipeline. Subsequently, the low-pressure media is transmitted through relevant diversion valves to the water jet-shell cutter joint tool 6 and the water jet-mechanical joint cutter head 7, thus completing the dynamic and static separation transmission of the low-pressure media from the outside to the water jet-shell cutter joint tool 6 and the water jet-mechanical joint cutter head 7.

[0065] This invention fully considers the pressure difference between high-pressure water media (generally greater than tens of megapascals) and other media (generally less than ten megapascals). Excessive pressure difference leads to significant differences in sealing levels between the two. To facilitate sealing and other design aspects, this invention proposes a modular design method for a water jet rotary joint 41 for rotating high-pressure water and a low-pressure medium rotary center 42 for rotating other media. Furthermore, the water jet rotary joint 41 is positioned along the axis of the low-pressure medium rotary center 42. The combination of the two constitutes a miniaturized, integrated multi-media rotary center 4 capable of simultaneously rotating and transmitting the media required by the tunneling machine and the media required by the high-pressure water jet system.

[0066] As shown in Figure 3(a), Figure 3(b) and Figure 4 As shown, the abrasive transmission system mainly consists of an active sand supply device 48, a sand transfer box 44, a connecting flange 43, a sand inlet 441, an air inlet 442, a sand discharge port 443, and an abrasive transmission pipeline 444.

[0067] The trailer 1 is also equipped with a sand tank, sand conveying pipe, etc., which can continuously supply abrasive to the sand inlet 441 of the transfer sand box 44.

[0068] As shown in Figures 3(a) and 3(b), the transfer sand box 44 is a hollow cylinder with a fixed connecting flange 43 on its outer side. The transfer sand box 44 is fitted outside the rotating end 422 of the low-pressure medium rotation center, with a sealing ring between them allowing relative rotation. A closed annular space (abrasive storage space) is formed between them, where an active abrasive supply device 48 is installed to control the quantitative supply of abrasive. The left side of the transfer sand box 44 is fixedly connected to the fixed end 421 of the low-pressure medium rotation center via the connecting flange 43, remaining stationary during operation. The sand inlet 441 and air inlet 442 are located at the top of the transfer sand box 44, used for transmitting abrasive and balancing air pressure, respectively. The sand drain port 443 is located at the bottom of the transfer sand box 44 and is normally sealed. When the abrasive inside the transfer sand box 44 needs to be replaced due to moisture or other reasons, the sand drain port 443 can be opened to promptly remove the abrasive from the transfer sand box 44.

[0069] like Figure 4 As shown, the active abrasive supply device 48 includes a conveying chamber 481 and a spiral blade 482. Abrasive is added to the active abrasive supply device 48 through the inlet 441 and enters the conveying chamber 481. The conveying chamber 481 has an annular structure, forming a closed space enclosed by the low-pressure medium rotating end 422 and the transfer sand box 44. The spiral blade 482 is positioned on the low-pressure medium rotating center rotating end 422 at a certain angle. After the abrasive falls onto the spiral blade 482 in the conveying chamber 481, the spiral blade 482 can push the abrasive in as the low-pressure medium rotating center rotating end 422 rotates. The abrasive transmission pipe 444 transports the abrasive towards the cutter head, ensuring continuous and uninterrupted abrasive supply. Simultaneously, by adjusting the arc angle and spacing of the spiral blade 482, the abrasive supply can be precisely controlled, achieving a long-distance, segmented, and unobstructed supply of abrasive from the trolley to the cutter head.

[0070] The arc angle of the spiral blades is adjusted according to the sand conveying volume and speed; the spacing of the spiral blades is also adjusted according to the sand conveying volume and speed.

[0071] The abrasive transmission pipe 444 is located inside the rotating end 422 of the low-pressure medium rotation center. One end is connected to the active abrasive supply device 48 (abrasive storage space), and the other end is connected to the combined cutting tool 6, enabling the transmission of abrasive from the active abrasive supply device 48 to the outside. Specifically, external abrasive is added to the inside through the abrasive inlet 441, during which the air inlet 442 of the transfer sand box 44 remains open to balance the internal air pressure. After the abrasive enters the active abrasive supply device 48 inside the transfer sand box 44 through the abrasive inlet 441, the abrasive outlet 443 remains closed to prevent abrasive leakage. After falling onto the spiral blades 482 in the sand conveying chamber 481, the rotation of the spiral blades 482 can be driven by the rotation of the rotating end 422 of the low-pressure medium rotation center, mechanically pushing the abrasive to move continuously towards the cutter head. At the same time, by adjusting the arc angle and spacing of the spiral blades 482, the abrasive can be controlled to be transmitted to the outside through the abrasive transmission pipe 444 in a stable and controllable amount, and then transmitted to the combined cutter 6 through the corresponding abrasive transmission pipe 444. Thus, the dynamic and static separation transmission of the abrasive from the outside to the combined cutter 6 is completed.

[0072] As shown in Figures 5(a) and 5(b), the waterjet-shell cutter combined tool 6 mainly consists of a shell cutter 61, a waterjet cutter head 62, a thread 621, a high-pressure water jet outlet 622, and a buffer material 63. The shell cutter 61 has an internal groove and an internal thread 621. The waterjet cutter head 62 has an external thread 621 at its shank and is embedded in the groove of the shell cutter 61. The two are fixedly connected by the thread 621. The working surface of the waterjet cutter head 62 is exposed on the surface of the shell cutter 61, and a high-pressure water jet outlet 622 is located at the end of the waterjet cutter head 62. Furthermore, the gap between the shell cutter 61 and the waterjet cutter head 62 is filled with the buffer material 63, which greatly reduces damage to the waterjet cutter head 62 caused by rock-breaking vibration.

[0073] The water jet-shell cutter combined cutter 6 not only has the original rock-scraping and breaking function of the shell cutter 61, but also effectively protects the water jet cutter head 62, greatly improving the safety and reliability of the water jet cutter head 62 during the rock breaking process of the full-face tunnel boring machine.

[0074] In addition, the waterjet-shell cutter combined tool 6 is also equipped with a real-time waterjet working status monitoring system (waterjet working status monitoring device), a sand supply system working status monitoring device, and a pipeline leakage detection system.

[0075] As shown in Figures 5(a) and 5(b), the water jet operating status monitoring device includes a high-pressure water gauge 64 and a water jet supply pipeline 65. One end of the water jet supply pipeline 65 is connected to the water switch 8, and the other end of the water jet supply pipeline 65 is directly connected to the water jet cutter head 62. The high-pressure water gauge 64 is installed on the water jet supply pipeline.

[0076] As a further limitation, each water jet cutter head 62 is equipped with a high-pressure water pressure gauge 64 on its water jet supply line 65. When the water jet cutter head 62 is working normally, the high-pressure water pressure gauge 64 reads normally. When the water jet cutter head 62 leaks or suffers other abnormal damage, the pressure at that water jet cutter head 62 will drop rapidly, and the working status of the water jet cutter head 62 can be fed back in real time through the high-pressure water pressure gauge 64.

[0077] As shown in Figures 5(a) and 5(b), the sand supply system operation status monitoring device includes a coil induction component 66, a water jet sand delivery pipeline 67, and a wireless transmission module 68. One end of the water jet sand delivery pipeline 67 is connected to the abrasive delivery pipeline 444, and the other end is directly connected to the water jet cutter head 62 for conveying abrasive. The coil induction component 66 is placed outside the water jet sand delivery pipeline 67 and connected to the wireless transmission module 68. When sand discharge detection is required, small steel balls can be thoroughly mixed with abrasive before being added to the sand inlet 441. When sand is being discharged normally from the sand pipe, the small steel balls pass through the induction coil component 66, thereby causing a change in the inductive reactance of the coil inside the induction coil component 66. The wireless transmission module 68 is used to capture the change in inductive reactance of the induction coil component 66 and convert the change in inductive reactance into a detection signal whose frequency varies with the inductive reactance, and transmit it to the terminal wirelessly. When the frequency of the detector signal increases, it indicates that the abrasive supply flow rate doped with small steel balls is large, and the sand tube is discharging sand normally. When the frequency decreases, it indicates that the abrasive supply flow rate doped with small steel balls is small, and the sand tube is blocked, requiring treatment.

[0078] like Figure 1 , Figure 2 As shown in Figures 3(a), 3(b), 5(a), and 5(b), this invention provides a pipeline leak detection system. A water pump delivers dye to the ultra-high pressure, ultra-high flow pump unit 2 through the dye inlet 22. The ratio of the water pump's displacement to the ultra-high pressure, ultra-high flow pump unit 2's displacement is the same as the ratio of dye to water, ensuring the dye is mixed in the optimal ratio. A stirring rod 23 is installed inside the ultra-high pressure, ultra-high flow pump unit 2 to quickly mix the dye and water. The dye mixture passes through the high-pressure water transmission pipeline 3, the water jet rotary joint 41, the multi-media rotary center 4 (high-pressure water transmission pipeline 413), the water jet diversion valve block 5, the water switch 8, and the water jet delivery pipeline 65, finally reaching the water jet-shell cutter combined blade 6. If a break or leak occurs at any point during this process, a colored residue will be left, facilitating timely detection and preventing further pipeline rupture and joint disconnection that could cause personal injury and equipment damage.

[0079] like Figure 6As shown, the waterjet-mechanical combined cutterhead 7 fully considers the stress on the cutters, rock-breaking efficiency, and service life at different positions on the combined cutterhead. The waterjet cutter head 62 and the forward cutter head 71 are arranged along the same trajectory to improve cutter stress, while the waterjet cutter head 62 and the side cutter head 72 are arranged along different trajectories to improve the overall rock-breaking efficiency of the cutterhead. Furthermore, multiple spare waterjet cutters are added to locations on the tunneling machine cutterhead that are prone to damage to extend cutter life.

[0080] like Figure 1 and Figure 6 As shown, the waterjet-mechanical combined cutterhead 7 mainly consists of a forward hob cutter 71, a side hob cutter 72, and a waterjet-shell cutter combined cutter 6. The design fully considers the force on the cutters, rock-breaking efficiency, and service life at different positions on the waterjet-mechanical combined cutterhead 7. Given that the forward hob cutter 71 has a larger blade spacing, resulting in significantly higher force on the cutter compared to other positions, the waterjet-shell cutter combined cutter 6 is arranged along a combined cutter arrangement trajectory 711 at the center of the cutterhead. This arrangement follows the same cutting trajectory as the forward hob cutter 71, thus improving the cutter's performance. Since the side hob cutter 72 experiences relatively lower force, the waterjet-shell cutter combined cutter 6 is arranged along a combined cutter arrangement trajectory 721 at the edge of the cutterhead, differing from the cutting trajectories of the side hob cutters 72, thereby improving the rock-breaking efficiency of the cutters.

[0081] Specifically, the water jet-shell cutter combined with the shell cutter 6 and the forward hob 71 located at the center can be set at the same concentric circle, while the other part of the water jet-shell cutter combined with the shell cutter 6 located at the edge can be set between the concentric circles where the edge hobs 72 are located.

[0082] To further improve the rock-breaking efficiency of water-jet assisted mechanical cutters, this invention divides the water-jet-mechanical combined cutterhead 7 into multiple zones, each equipped with a cutter pressure sensor. During tunneling machine operation, the cutter pressure sensor signals are collected and recorded. When the collected signal value exceeds a set value, it automatically determines that each zone of the water-jet-mechanical combined cutterhead 7 has rotated to this angle. At this time, the corresponding water switch 8 located behind the water-jet cutter head 62 is opened, and the water-jet cutter head 62 of that zone emits a high-pressure water jet. In addition, the locations of the cutterhead of the full-face tunnel boring machine that are prone to damage are obtained through field measurement and statistical methods. Multiple spare water-jet-shell cutter heads 6 are added at these locations to improve the service life of the water-jet-mechanical combined cutterhead 7.

[0083] This embodiment provides a water jet cutting system mounted on a high-pressure water jet tunneling machine, which can switch between various combined rock breaking methods by changing the high-pressure water jet-mechanical coordination mode, including the following rock breaking methods:

[0084] (1) Pure mechanical tunneling rock breaking method: The ultra-high pressure and ultra-large flow pump group 2 stops working, and there is no high pressure water in the high pressure water transmission pipeline 3 that is transmitted to the multi-medium rotation center 4. The water jet-mechanical combined cutter head 7 rotates and propels, relying solely on pure mechanical cutters to break rocks.

[0085] (2) Pure water jet cutting and rock breaking method: The ultra-high pressure and ultra-high flow pump group 2 works and generates high pressure water. The high pressure water is transmitted to the multi-medium rotation center 4 through the high pressure water transmission pipeline 3, flows out through the central hole of the low pressure medium rotation center 42, and is divided into the required multi-channel medium through the water jet diversion valve block 5. Finally, it is transmitted to the water jet-shell knife combined cutter 6 at the cutter head position. In addition, the water jet-mechanical combined cutter head 7 stops rotating and relies solely on pure water jet cutting and rock breaking.

[0086] (3) High-pressure water jet-mechanical combined rock breaking method: The ultra-high pressure and ultra-large flow pump group 2 works and generates high-pressure water. The high-pressure water is transmitted to the multi-medium rotation center 4 through the high-pressure water transmission pipeline 3, flows out through the central hole of the low-pressure medium rotation center 42, and is divided into multiple media as required by the water jet diversion valve block 5. Finally, it is transmitted to the water jet-shell cutter 6 at the cutter head position. At the same time, the water jet-mechanical combined cutter head 7 rotates and advances. Both high-pressure water jet and mechanical cutter rock breaking methods are in effect. The tunnel boring machine adopts the high-pressure water jet-mechanical combined method for rock breaking.

[0087] In the above testing method, different types of water jet cutter heads 62 can be replaced to change the energy distribution of high-pressure water, such as high-pressure pure water jet, high-pressure abrasive water jet, pulsed water jet, cavitation jet, particle jet, slurry jet, etc. The ultra-high pressure, ultra-high flow rate pump set 2 can be adjusted to set different water jet rock-breaking parameters, such as jet pressure and flow rate. Furthermore, multiple high-pressure water jet-mechanical coordination modes can be adaptively switched according to the tunneling environment to achieve optimal rock-breaking efficiency.

[0088] This embodiment provides a waterjet cutting system mounted on a high-pressure waterjet tunneling machine. It fully considers the pressure difference between high-pressure water medium (generally greater than tens of megapascals) and other media (generally less than ten megapascals). The excessive pressure difference leads to a huge difference in the sealing level between the two. In order to facilitate sealing and other designs, a waterjet rotary joint for rotating and transmitting high-pressure water and a low-pressure medium rotary center for rotating and transmitting other media are proposed. The waterjet rotary joint is placed on the axis of the low-pressure medium rotary center. The combination of the two constitutes a miniaturized and integrated multi-media rotary center that can simultaneously rotate and transmit the media required by the tunneling machine and the media required by the high-pressure waterjet system.

[0089] This embodiment provides a waterjet cutting system mounted on a high-pressure waterjet tunneling machine. For the generation and transmission of high-pressure water, it is generated by an ultra-high-pressure, ultra-high-flow pump unit placed on a trailer. The high-pressure water is then transmitted via a high-pressure water pipe to the fixed end of the waterjet rotary joint. From the rotating end of the waterjet rotary joint, it flows out through the central hole of the low-pressure medium rotation center and is transmitted to the waterjet diversion valve block. The waterjet diversion valve block can divide the incoming high-pressure water into multiple required water paths, further reducing the size of the rotation center. Finally, the high-pressure water is transmitted through pipelines to the waterjet cutter head at the cutterhead position. Other low-pressure media, such as low-pressure cooling water and foam / bentonite required by the tunneling machine, as well as abrasives and high-pressure air required by the waterjet system, are all transmitted via relevant pipelines to the fixed end of the low-pressure medium rotation center. From the rotating end of the low-pressure medium rotation center, it flows out through the central hole of the low-pressure medium rotation center and is transmitted to the corresponding diversion valve block, where it is divided into multiple required media paths before being transmitted to the waterjet cutter head at the cutterhead position.

[0090] This embodiment provides a water jet cutting system mounted on a high-pressure water jet tunneling machine. The pipeline and the connection between the cutter nozzle are protected by welded steel plates, and an observation door is provided to protect people and objects inside the soil chamber.

[0091] This embodiment provides a waterjet cutting system for a high-pressure waterjet tunneling machine. The ultra-high pressure and ultra-high flow pump unit is driven by a variable frequency motor with adjustable speed in stages. At the same time, a pilot-operated relief valve is installed at the outlet of the ultra-high pressure and ultra-high flow pump unit. Before the ultra-high pressure and ultra-high flow pump unit is started, the pilot-operated relief valve is energized to unload. When the ultra-high pressure and ultra-high flow pump unit reaches the preset pressure and flow value, the pilot-operated relief valve is de-energized and reloaded. The entire control system can not only greatly reduce the pressure fluctuation during the pump unit startup process, but also protect the various components from damage, further reducing construction risks while ensuring the rock breaking and pile cutting effects.

[0092] During the rock-breaking process of a tunneling machine, the cutterhead directly contacts and breaks the rock, subjecting it to tremendous impact and abrasive forces. Therefore, the waterjet cutter head needs to be equipped with a safe and reliable protective device. This embodiment provides a waterjet cutting system for a high-pressure waterjet tunneling machine, in which the waterjet cutter head is embedded within a shell cutter as a combined waterjet-shell cutter. The combined cutter not only has the original scraping function of the shell cutter but also effectively protects the waterjet cutter head. In addition, to further improve the reliability and service life of the combined cutter, buffer material is filled in the pores between the waterjet cutter head and the shell cutter, greatly reducing the damage to the waterjet cutter head caused by rock-breaking vibration.

[0093] This embodiment provides a water jet cutting system mounted on a high-pressure water jet tunneling machine, with multiple effective methods and facilities to ensure the safe transmission of high-pressure water jets.

[0094] This embodiment provides a waterjet cutting system for a high-pressure waterjet tunneling machine. It fully addresses the challenge of not being able to obtain real-time information on the working status of the waterjet on the cutterhead and accurately locate damaged waterjet units. A pressure gauge is installed on the water supply line of each waterjet, and an induction coil assembly is installed on the sand supply line of each waterjet. When a waterjet leaks or suffers other abnormal damage, the pressure at that waterjet will drop rapidly, and the pressure gauge provides real-time feedback on the waterjet's working status. Furthermore, to detect whether the sand pipe is discharging sand normally, small steel balls are thoroughly mixed with abrasive before sand is added to the sand inlet. When the sand pipe is discharging sand normally, the small steel balls pass through the induction coil assembly, causing a change in the inductive reactance of the coil within the assembly. A wireless transmission module captures this change in reactance and converts it into a detector signal with a frequency that varies with the reactance, which is then wirelessly transmitted to the terminal. A higher frequency indicates a larger abrasive supply flow rate mixed with small steel balls, while a lower frequency indicates a smaller abrasive supply flow rate.

[0095] This embodiment provides a waterjet cutting system mounted on a high-pressure waterjet tunneling machine, which includes a dye mixing device. A water pump is used to input the dye into the housing. The ratio of the water pump displacement to the displacement of the ultra-high pressure and ultra-high flow pump group is the same as the ratio of dye to water, ensuring that the dye can be mixed in the optimal ratio. A stirring rod is installed in the housing to quickly mix the dye and water. When the dye mixture passes through damaged or leaking hoses, rigid pipes, or high-pressure pipe joints, it leaves colored residue, which facilitates timely detection and discovery of leaks, and prevents further pipeline rupture and joint disconnection that could cause personal injury and equipment damage.

[0096] This embodiment provides a waterjet cutting system for a high-pressure waterjet tunneling machine, which fully considers the stress, rock-breaking efficiency, and service life of the cutters at different positions on the combined cutterhead. Considering that the spacing between the forward cutters is larger and the stress on the cutters is significantly higher than in other positions, the waterjet cutter head is arranged along the same trajectory as the forward cutters to improve the stress on the cutters. Considering that the stress on the cutters at the edge positions is relatively smaller, the waterjet cutter head is arranged along a different trajectory than the edge cutters to improve the overall rock-breaking efficiency of the cutterhead. In addition, the locations on the tunneling machine cutterhead that are prone to damage are obtained through field measurement and statistical methods, and multiple spare waterjet cutters are added at these locations to improve the service life of the cutters.

[0097] This embodiment provides a waterjet cutting system for a high-pressure waterjet tunneling machine. To further improve the rock-breaking efficiency of the waterjet-assisted mechanical cutter, the cutterhead is divided into multiple zones, each equipped with a cutter pressure sensor. During operation, the tunneling machine collects and records the cutter pressure sensor signals. When the collected signal value exceeds a set value, it automatically determines that each zone of the cutterhead has rotated to this angle. At this time, the corresponding water switch behind the water jet opens, and the waterjet cutter head of that zone ejects a high-pressure water jet. Simultaneously, multiple spare water jets are installed at the cutterhead to improve the reliability of the waterjet system and further ensure the combined tunneling efficiency.

[0098] This embodiment provides a waterjet cutting system mounted on a high-pressure waterjet tunneling machine. It fully considers the limitations of the sand supply principle of the rotary center, which makes the sand supply process susceptible to factors such as gravity, resulting in unstable and uncontrollable sand supply. Therefore, it proposes an active sand supply device for quantitatively controlling the abrasive supply. This active sand supply device is placed inside the transfer sand box, ensuring stable and controllable sand supply. Combined with the original rotary center device, it forms a multi-media rotary center capable of active sand supply. The low-pressure media rotary center's rotating end is surrounded by a transfer sand box, and the annular sealed space formed between the two, along with the spiral blades, constitutes the active sand supply device. When the high-pressure water jet system is working, abrasive can be added to the system through the sand inlet. After the abrasive enters the gap between the spiral blades in the sand conveying chamber through the sand inlet, the spiral blades are driven to rotate by the rotation center of the low-pressure medium, which can continuously push the abrasive towards the cutter head. By controlling the arc angle and spacing of the spiral blades, the abrasive in the sand box can be input into the abrasive transmission pipeline in a stable and controllable amount, and then transmitted to the water jet cutter head in the cutter head through the transmission pipeline.

[0099] This embodiment provides a water jet cutting system for a high-pressure water jet tunneling machine, which solves the problems of unstable and uncontrollable sand supply in high-pressure water jet cutting systems, as well as the technical and process difficulties in the actual tunneling machine installation process. It greatly optimizes the sand supply effect of the system, and provides practical suggestions and references for the overall design, optimization and spatial layout of high-pressure water jet systems, improving the quality and efficiency of engineering construction, and saving time and economic costs on site.

[0100] Example 2

[0101] Embodiment 2 of the present invention provides a tunneling machine.

[0102] This embodiment provides a tunneling machine that uses a water jet cutting system mounted on a high-pressure water jet tunneling machine as described in Embodiment 1.

[0103] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A waterjet cutting system mounted on a high-pressure waterjet tunneling machine, characterized in that: It includes a fixed end of a water jet rotary joint, a rotating end of a water jet rotary joint, a fixed end of a low-pressure medium rotation center, and a rotating end of a low-pressure medium rotation center. The rotating end of the water jet rotary joint and the rotating end of the low-pressure medium rotation center rotate synchronously with the combined cutter head. The water jet rotary joint is positioned on the axis of the low-pressure medium rotation center. A high-pressure water transmission pipe is provided on the central axis of the rotating end of the low-pressure medium rotation center. The fixed end of the water jet rotary joint, the rotating end of the water jet rotary joint, and the high-pressure water transmission pipe are connected in sequence for rotating and transmitting high-pressure water to the combined cutting tool. The multi-media rotary center consists of a water jet rotary joint, a low-pressure media transmission system, and an abrasive transmission system. The abrasive transmission system mainly consists of an active sand supply device, a transfer sand box, a connecting flange, a sand inlet, an air inlet, a sand outlet, and an abrasive transmission pipeline. The abrasive storage space formed between the rotating end of the low-pressure media rotary center and the transfer sand box serves as the sand conveying chamber. The spiral blades are set on the rotating end of the low-pressure media rotary center. The rotation of the rotating end drives the spiral blades to rotate, continuously pushing the abrasive towards the cutter head. By adjusting the spacing and arc angle of the spiral blades, the abrasive is input into the system in a precise quantity. The fixed end of the low-pressure medium rotation center is sleeved on the outside of the rotating end of the low-pressure medium rotation center; several annular grooves are opened on the inner side of the fixed end of the low-pressure medium rotation center, and a low-pressure medium input hole is opened on each annular groove; several low-pressure medium transmission pipes are arranged inside the rotating end of the low-pressure medium rotation center, the first end of each low-pressure medium transmission pipe is connected to an annular groove, and the second end of the low-pressure medium transmission pipe is connected to a combined cutting tool and / or a combined cutting disc.

2. The waterjet cutting system mounted on a high-pressure waterjet tunneling machine as described in claim 1, characterized in that: It also includes ultra-high pressure and ultra-large flow pump sets driven by variable frequency motors with progressively adjustable speed; The ultra-high pressure and ultra-high flow pump set includes a housing and a pilot-operated overflow valve. The top of the housing has a pump set inlet, and the bottom of the housing has an outlet, which is connected to the pilot-operated overflow valve. The pilot-operated overflow valve is connected to the fixed end of the water jet rotary joint through a high-pressure water transmission pipeline.

3. The waterjet cutting system mounted on a high-pressure waterjet tunneling machine as described in claim 2, characterized in that: The pilot-operated relief valve is energized and unloaded before the ultra-high pressure and ultra-high flow pump unit is started; the pilot-operated relief valve is de-energized and reloaded when the ultra-high pressure and ultra-high flow pump unit reaches the preset pressure and flow values.

4. The waterjet cutting system mounted on a high-pressure waterjet tunneling machine as described in claim 2, characterized in that: The top of the housing is also provided with a pump inlet for dyeing agent, and a stirring rod is provided inside the housing.

5. The waterjet cutting system mounted on a high-pressure waterjet tunneling machine as described in claim 1, characterized in that: The combined cutting tool includes a shell cutter, a water jet cutter head, and a cushioning material; The shell cutter has a groove inside, the water jet cutter head is embedded in the groove of the shell cutter, and the gap between the shell cutter and the water jet cutter head is filled with buffer material.

6. The waterjet cutting system mounted on a high-pressure waterjet tunneling machine as described in claim 1, characterized in that: The combined cutting tool is arranged at the concentric circle of the positive hob, or the combined cutting tool is arranged between the concentric circles of the side hobs.

7. The waterjet cutting system mounted on a high-pressure waterjet tunneling machine as described in claim 1, characterized in that: The high-pressure water transmission pipeline is connected to the combined cutting tool via a diversion valve block, a water switch, and a water jet water supply line in sequence, and a high-pressure water pressure gauge is installed on the water jet water supply line.

8. The waterjet cutting system mounted on a high-pressure waterjet tunneling machine as described in claim 1, characterized in that: It also includes a transfer sand box fitted on the outside of the rotating end of the low-pressure medium rotation center; One end of the abrasive conveying pipe is connected to the abrasive storage space, and the other end is connected to the combined cutting tool. The abrasive delivery pipeline is connected to the combined cutting tool via a water jet sand delivery pipeline, and a coil induction component connected to the wireless transmission module is installed on the outside of the water jet sand delivery pipeline.

9. The waterjet cutting system mounted on a high-pressure waterjet tunneling machine as described in claim 1, characterized in that: The abrasive storage space is equipped with several spiral blades. By adjusting the arc angle and spacing of the spiral blades, the sand conveying speed and sand conveying volume to the abrasive conveying pipe can be changed.

10. A tunneling machine, characterized in that: The water jet cutting system is used on a high-pressure water jet tunneling machine as described in any one of claims 1-9.

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