A combined tunneling cutter, tunneling device and tunneling method

Abstract

The application discloses a combined tunneling cutter, a tunneling device and a tunneling method, and belongs to the technical field of tunneling devices. The combined tunneling cutter comprises a cutter seat, a plurality of rolling cutters arranged on the cutter seat, an adjusting structure arranged on the cutter seat and used for adjusting the digging diameter of the rolling cutters, a central crushing cutter arranged at the end of the cutter seat, a metal detection module and a cutting module arranged on the central crushing cutter, and the metal detection module and the cutting module are electrically connected with a controller. The combined tunneling cutter, the tunneling device and the tunneling method can solve the problem that the existing tunneling cutter has a poor treatment effect on metal components during tunneling.

Description

Technical Field

[0001] This invention relates to the field of tunneling equipment technology, and in particular to a composite tunneling cutterhead, tunneling device, and tunneling method. Background Technology

[0002] Currently, traditional drilling tools face challenges in deep mining or underground engineering operations, as well as disaster relief efforts, due to difficulties in transportation, complex assembly, and limited cutting capabilities. Especially when dealing with hard strata or complex metal structures, existing equipment often fails to efficiently complete crushing, cutting, and exploration tasks.

[0003] In complex geological environments and disaster relief operations, metal components are often buried in fractured rock layers or collapsed structures, making it difficult for traditional detection technologies to quickly and accurately locate their positions. Especially downhole or other catastrophic environments, the accuracy of metal component detection is crucial for ensuring the safety of drilling equipment and improving operational efficiency.

[0004] In fields such as mining and underground engineering disaster relief, when encountering metal components (such as reinforcing bars, anchor cables, and anchor bolts), traditional cutting methods use lasers or saw blades. However, these methods are unsuitable for emergency rescue operations due to their high energy consumption, low efficiency, and inability to adapt to complex environments. Especially in situations involving deep collapses or complex geological conditions, the visibility of metal components is poor, making traditional cutting tools ineffective. Summary of the Invention

[0005] The purpose of this invention is to provide a composite tunneling cutterhead, tunneling device, and tunneling method to solve the problem of poor handling of metal components by existing tunneling cutterheads during the tunneling process.

[0006] To achieve the above objectives, the present invention provides a composite tunneling cutterhead, including a cutter holder, on which a plurality of roller cutters are arranged, and an adjustment structure for adjusting the digging diameter of the roller cutters is provided on the cutter holder. A central crushing cutter is provided at the end of the cutter holder, and the central crushing cutter is spaced apart from the roller cutters. A metal detection module and a cutting module are provided on the central crushing cutter, and both the metal detection module and the cutting module are electrically connected to a controller.

[0007] Preferably, the adjustment structure includes a mounting groove on the cutter holder, sliding grooves on both sides of the mounting groove, a cutter mounted on a slide block located within the mounting groove, and sliders adapted to the sliding grooves on both sides of the slide block located within and slidably connected to the sliding grooves; the slide block slides within the mounting groove to adjust the digging diameter between the cutters.

[0008] Preferably, the cutter holder is provided with a mounting platform corresponding to the central crushing cutter. The mounting platform is located between the roller cutters. The mounting platform is provided with a clearance groove for the pipeline to pass through. The central crushing cutter is fixed on the mounting platform, and the end of the central crushing cutter near the axis of the cutter holder abuts against it. The end of the central crushing cutter away from the cutter holder is provided with a slot for installing the blade.

[0009] Preferably, the metal detection module includes a focusing electrode for detecting the position and shape of metal. Several focusing electrodes are uniformly arranged in a linear array on the central crushing blade. The interior of the central crushing blade is provided with a first mounting hole corresponding to each focusing electrode. The focusing electrodes are arranged in the first mounting holes along the height direction of the central crushing blade. The focusing electrodes are electrically connected to the controller.

[0010] Preferably, the central crusher blade has a central groove for mounting a focusing electrode at one end near the center of the blade holder, and the central grooves at several ends of the central crusher blade are joined together to form a mounting hole for mounting the central focusing electrode of the blade holder.

[0011] Preferably, the metal detection module includes a magnetic detector for detecting ferromagnetic metals, and a second mounting hole is provided at one end of the central crushing blade near the center of the blade holder. The magnetic detector is installed in the second mounting hole and is electrically connected to the controller.

[0012] Preferably, the cutting module includes a high-pressure water jet cutting head for cutting metal. A third mounting hole for the cutting head is provided on the central crushing blade. The blade holder has a pipeline hole and a clearance hole for the connecting pipe to pass through. The cutting head includes a body, a connector, and a nozzle. The connector and nozzle are connected through the body, and the body is connected to the connecting pipe through the connector. The connector has a first water chamber inside, the diameter of which is smaller than the diameter of the connecting pipe. The end of the first water chamber is connected to the connecting pipe through a flared opening. The body has a second water chamber inside, the diameter of which is larger than the diameter of the first water chamber. The first water chamber communicates with the second water chamber through the flared opening. The nozzle has a spray chamber inside, the diameter of which is smaller than the diameter of the first water chamber. The second water chamber communicates with the spray chamber through the flared opening. Water enters the cutting head and is accelerated to form a high-speed jet for metal cutting.

[0013] Preferably, the cutter holder is provided with a scraper, which is located on one side of the roller cutter and between the roller cutter and the central crushing cutter.

[0014] A tunneling device includes the aforementioned composite tunneling cutterhead, which is connected to an external moving device via a connecting seat. The connecting seat has a central hole through which a pipeline passes.

[0015] The tunneling method based on the above-mentioned tunneling device includes the following steps:

[0016] S1. Adjust the position of the slide block in the installation slot according to the tunneling requirements, and adjust the digging radius of the cutter head;

[0017] S2. Start the metal detection module. During the excavation process, the focusing electrode and magnetic detector of the metal detection module will detect the metal buried deep in the tunnel. The controller will adjust the attitude of the cutterhead according to the detection results to avoid collision and interference with the detected metal parts.

[0018] S3. When it is necessary to cut the detected metal, start the cutting module, and high-pressure water will cut the metal part through the cutting head.

[0019] The advantages and positive effects of the composite tunneling cutterhead, tunneling device, and tunneling method described in this invention are:

[0020] 1. This invention incorporates a roller cutter, scraper, and central breaker on the cutterhead. The roller cutter has an adjustable diameter, allowing for flexible switching of its working radius according to different geological conditions. This ensures strong cutting capability in hard rock formations and stable propulsion in loose soil. The central breaker, as the core cutting unit of the cutterhead, concentrates crushing of the rock mass at the front end, improving tunneling efficiency and effectively balancing the stress on the cutterhead, reducing structural damage caused by localized stress concentration. The synergistic effect of these two components significantly enhances the overall adaptability and durability of the cutterhead. The scraper effectively removes loose rock and soil, reducing drilling resistance. 2. A metal detection module is integrated into the cutterhead. This module uses a focusing electrode and a magnetic detector to detect metals, improving detection accuracy and preventing collisions between the cutterhead and metal components, ensuring equipment and personnel safety. Both the focusing electrode and the magnetic detector are located on the central breaker, increasing the cutterhead's integration level without affecting normal excavation and facilitating metal detection, thus improving detection accuracy.

[0021] 3. The cutterhead integrates a cutting module, employing ultra-high-speed water jets to cut metal components. This effectively avoids cutterhead deformation and thermal damage caused by heating, ensuring the cutterhead's tunneling efficiency in complex environments and extending the tool life. The ultra-high-speed water jet cutting method is particularly suitable for metal cutting in complex environments such as coal mines and underground mines, effectively cutting through collapsed, invisible metal. The cutting head, focusing electrode, and magnetic detector are all located on the central breaker, enabling the cutting head to perform rapid, efficient, and accurate cutting based on the metal components detected by the focusing electrode and magnetic detector.

[0022] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the three-dimensional structure of the cutter head according to Embodiment 1 of the present invention;

[0024] Figure 2 This is a top view schematic diagram of the cutter head structure according to Embodiment 1 of the present invention;

[0025] Figure 3 This is a schematic diagram of the cutter head body structure according to Embodiment 1 of the present invention;

[0026] Figure 4 This is a schematic diagram of the cross-sectional structure of the cutter head according to Embodiment 1 of the present invention;

[0027] Figure 5 This is a schematic diagram of the three-dimensional structure of the tool holder according to Embodiment 1 of the present invention;

[0028] Figure 6 This is a schematic diagram of the hobbing cutter mounting structure according to Embodiment 1 of the present invention;

[0029] Figure 7 This is a schematic diagram of the three-dimensional structure of the central crushing blade in Embodiment 1 of the present invention;

[0030] Figure 8 This is a schematic diagram of the three-dimensional structure of the scraper in Embodiment 1 of the present invention;

[0031] Figure 9 This is a three-dimensional structural diagram of the cutting head according to Embodiment 1 of the present invention;

[0032] Figure 10 This is a schematic diagram of the cross-sectional structure of the cutting head in Embodiment 1 of the present invention.

[0033] Figure Labels

[0034] 1. Blade holder; 2. Slide; 3. Roller cutter; 4. Scraper; 5. Central crusher; 6. Focusing electrode; 7. Magnetic detector; 8. Cutting head; 9. Connecting seat; 10. First mounting hole; 11. Second mounting hole; 12. Third mounting hole; 13. Central hole; 14. Connecting pipe; 15. Mounting groove; 16. Slide groove; 17. Mounting platform; 18. Clearance groove; 19. Clearance hole; 20. Pipe hole; 21. Slider; 22. Central groove; 23. Mounting block; 24. Slot; 25. Body; 26. Connector; 27. Nozzle; 28. Sealing ring; 29. ​​First water chamber; 30. Second water chamber; 31. Spray chamber. Detailed Implementation

[0035] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] In this application, unless otherwise defined, 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 application pertains. In case of any inconsistency, the meaning set forth in this specification or derived from the content described herein shall prevail. Furthermore, the terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit the scope of this application.

[0037] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0038] Example 1

[0039] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, a composite tunneling cutterhead includes a cutterhead holder 1, on which several roller cutters 3 are mounted. In this embodiment, three roller cutters 3 are mounted on the cutterhead holder 1 and are evenly distributed in a circumferential array. A central breaking cutter 5 is mounted at the end of the cutterhead holder 1, also evenly distributed in a circumferential array at the end of the cutterhead holder 1. The central breaking cutter 5 is spaced apart from the roller cutters 3 and overlaps with them. The central breaking cutter 5 performs tunneling at the center of the cutterhead holder 1, while the roller cutters 3 perform tunneling at the edge of the cutterhead holder 1, which helps improve the tunneling efficiency of the cutterhead. A metal detection module and a cutting module are mounted on the central breaking cutter 5, both of which are electrically connected to a controller. The metal detection module detects metal buried in the soil, preventing interference between the metal and the cutterhead. The cutting module cuts the detected metal, ensuring normal tunneling operation.

[0040] like Figure 5 , Figure 6As shown, the cutter holder 1 is equipped with an adjustment structure for adjusting the digging diameter of the roller cutter 3. The adjustment structure includes a mounting groove 15 on the cutter holder 1, with sliding grooves 16 on both sides of the mounting groove 15. The roller cutter 3 is mounted on a slide block 2, which has a motor that drives the roller cutter 3 to rotate. The slide block 2 is located within the mounting groove 15. Sliding blocks 21, adapted to the sliding grooves 16, are integrally mounted on both sides of the slide block 2. The sliding blocks 21 are located within and slidably connected to the sliding grooves 16. The slide block 2 slides within the mounting groove 15, adjusting the digging diameter between the roller cutters 3. The two ends of the slide block 2 have inwardly inclined slopes to facilitate smooth sliding within the mounting groove 15. The bottom of the mounting groove 15 bends upward to position the slide block 2 and prevent it from slipping out of the mounting groove 15. In this embodiment, the diameter range of the cutter head 3 is φ555 mm–φ665 mm, with a diameter variation of 110 mm and an opening of 30%, enabling the cutter head to adapt to different types of strata and to change diameter during the tunneling process to meet the tunneling needs of different strata.

[0041] like Figure 7 As shown, the cutter holder 1 is equipped with mounting platforms 17 corresponding to the central crusher blades 5, and the mounting platforms 17 are located between the roller cutters 3. The mounting platforms 17 have clearance grooves 18 to facilitate pipeline passage. The bottom of the central crusher blade 5 is equipped with a mounting block 23, which is welded to the mounting platform 17 to fix the central crusher blade 5 on the mounting platform 17. The end of the central crusher blade 5 closest to the axis of the cutter holder 1 abuts against the central crusher blade. The end of the central crusher blade 5 away from the cutter holder 1 is provided with a blade mounting groove 24, and the blades are fixed in a linear array within the groove 24 for easy blade replacement.

[0042] like Figure 8 As shown, a scraper 4 is mounted on the cutterhead 1, located on one side of the roller cutter 3 and between the roller cutter 3 and the central breaker 5. The cutterhead 1 is made of high-strength alloy material to ensure its compressive strength and wear resistance in complex operating environments. The cutterhead integrates two tunneling tools: the roller cutter 3 and the scraper 4. The roller cutter 3 is used to break hard rock layers, while the scraper 4 is used to remove loose soil and rock, reducing drilling resistance. Through their combined action, the cutterhead can efficiently break both soft and hard rock layers, increasing drilling speed. The central breaker 5 enhances the stress-bearing capacity of the cutterhead structure, effectively preventing deformation or damage to the cutterhead during large-scale drilling.

[0043] The metal detection module includes focusing electrodes 6 for detecting the position and shape of metal. Several focusing electrodes 6 are uniformly arranged in a linear array on a central crushing blade 5. The central crushing blade 5 has first mounting holes 10 corresponding to the focusing electrodes 6 one-to-one. The focusing electrodes 6 are fixedly mounted within the first mounting holes 10 along the height direction of the central crushing blade 5. The bottom of the central crushing blade 5 has a groove for placing the wires connecting the focusing electrodes 6. The focusing electrodes 6 are electrically connected to a controller. A central groove 22 for mounting the focusing electrodes 6 is provided at one end of the central crushing blade 5 near the center of the blade holder 1. Several central grooves 22 at the ends of the central crushing blade 5 are joined together to form a mounting hole for the central focusing electrodes 6 of the blade holder 1.

[0044] The focusing electrode 6 employs a combination of a main power supply electrode and a shielding electrode, utilizing the principle of current focusing to improve detection depth and imaging accuracy. Through electrode configuration, it focuses current into the strata, enabling the detection of metal components and providing feedback on their location, shape, and other information. Compared to traditional metal detection technologies, the focusing electrode 6 device can perform detection in deeper underground environments, especially where rock formations are severely fractured, where its advantages are even more pronounced. The focusing electrodes 6 are evenly distributed on the central crushing cutter 5, i.e., at the front end of the cutter head, which further enhances the depth and accuracy of metal detection.

[0045] The metal detection module includes a magnetic detector 7 for detecting ferromagnetic metals. A second mounting hole 11 is provided at one end of the central cutter head 5 near the center of the cutter head 1. The magnetic detector 7 is fixedly installed in the second mounting hole 11 and is electrically connected to the controller. The magnetic detector 7 sends the detected signal to the controller, which adjusts the cutting direction of the cutter head to prevent collisions between the cutter head and metal components. The magnetic detector 7 can be selected from existing structures as needed.

[0046] The magnetic detector 7 identifies ferromagnetic metallic objects by detecting disturbances in the Earth's magnetic field. Ferromagnetic metallic components alter the distribution of the Earth's magnetic field, and by monitoring these disturbance signals, the magnetic detector 7 can accurately identify metallic components in front of or to the side, providing timely feedback for subsequent drilling and cutting operations. The magnetic detector 7 can effectively identify metallic components such as reinforcing bars and anchor cables.

[0047] In this embodiment, the focusing electrode 6 and the magnetic detector 7 work together to improve the identification accuracy of metal components. The focusing electrode 6 and the magnetic detector 7 are integrated at the front of the cutter holder 1 to improve the accuracy of metal detection; and they are also integrated inside the central crushing cutter 5, which helps to improve the integration level of the cutter disc and reduce its volume.

[0048] like Figure 9 , Figure 10As shown, the cutting module includes a high-pressure water jet cutting head 8 for cutting metal. A third mounting hole 12 for mounting the cutting head 8 is provided on the central breaker 5. Integrating the cutting head 8 onto the central breaker 5 improves the integration of the cutterhead, reduces its size, and does not affect its normal tunneling operation. The cutting head 8, focusing electrode 6, and magnetic detector 7 are all mounted on the central breaker 5, enabling the cutting head 8 to perform rapid, efficient, and accurate cutting based on the metal components detected by the focusing electrode 6 and magnetic detector 7.

[0049] The cutter holder 1 has a pipe hole 20 and a clearance hole 19 inside for the connecting pipe 14 of the cutting head 8 to pass through, which also helps to reduce the weight of the cutter holder 1. The cutting head 8 includes a body 25, a connector 26, and a nozzle 27. The connector 26 and the nozzle 27 are connected through the body 25. The end of the connector 26 near the body 25 is located inside the body 25 and is threadedly connected to the body 25. One end of the nozzle 27 is fixedly inserted into the body 25. The body 25 is provided with a sealing ring 28 for sealing with the central crushing blade 5. The body 25 is connected to the connecting pipe 14 through the connector 26. The connector 26 has a first water chamber 29 inside, the diameter of which is smaller than the diameter of the connecting pipe 14. The end of the first water chamber 29 is connected to the connecting pipe 14 through a flared opening. The body 25 has a second water chamber 30 inside, the diameter of which is larger than the diameter of the first water chamber 29. The first water chamber 29 communicates with the second water chamber 30 through the flared opening. The nozzle 27 has an internal spray chamber 31, the diameter of which is smaller than the diameter of the first water chamber 29. The second water chamber 30 is connected to the spray chamber 31 via a funnel-shaped opening. Water enters the cutting head 8 and is accelerated by the first water chamber 29, the second water chamber 30, the spray chamber 31, and the funnel-shaped opening, forming a high-speed jet for metal cutting. Using a high-speed water jet to cut metal components effectively avoids cutter head deformation and thermal damage caused by heating, ensuring the cutting efficiency of the cutter head in complex environments and extending the service life of the cutters. Using a high-speed water jet to cut metal components is particularly suitable for metal cutting in complex environments such as coal mines and underground mines, effectively cutting collapsed, invisible metal.

[0050] Example 2

[0051] A tunneling device includes a composite tunneling cutterhead as described in Embodiment 1. The composite tunneling cutterhead is connected to an external moving device via a connecting seat 9. The external moving device can adopt an existing structure as needed to drive the cutterhead to move. The top end of the connecting seat 9 is inserted into the clearance hole 19 of the cutterhead 1 and is fixedly connected to the cutterhead by welding or threading. A positioning platform is fixedly provided on the connecting seat 9 to position the cutterhead 1, facilitating the installation of the cutterhead 1 on the connecting seat 9. A central hole 13 is provided inside the connecting seat 9 for pipelines to pass through.

[0052] The mobile device is equipped with an abrasive jet unit connected to the cutting head 8. This unit generates a high-pressure, high-speed abrasive jet to cut the metal. The addition of abrasive to the ultra-high-speed water jet effectively improves the cutting effect and efficiency, enabling the cutting of difficult-to-cut metal components. The abrasive jet unit can utilize existing structures as needed.

[0053] The tunneling method based on the above-mentioned tunneling device includes the following steps:

[0054] S1. Adjust the position of the slide block 2 in the installation slot 15 according to the tunneling requirements, and adjust the digging radius of the cutter head 3.

[0055] S2. Start the metal detection module. During the excavation process, the focusing electrode 6 and magnetic detector 7 of the metal detection module will detect the metal buried deep in the tunnel. The detection results will be sent to the controller. The controller will adjust the attitude of the cutterhead according to the detection results to avoid collision and interference between the cutterhead and the detected metal parts.

[0056] S3. When it is necessary to cut the detected metal, start the cutting module. High-pressure water or a mixture of high-pressure water and abrasive enters the cutting head 8 to form a jet to cut the metal part.

[0057] Therefore, by using the composite tunneling cutterhead, tunneling device, and tunneling method described in this invention, the problem of poor handling of metal components by existing tunneling cutterheads during the tunneling process can be solved.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A composite tunneling cutterhead, characterized in that: It includes a cutter holder, on which several roller cutters are installed. The cutter holder is equipped with an adjustment structure for adjusting the digging diameter of the roller cutters. A central crushing cutter is installed at the end of the cutter holder. The central crushing cutter and the roller cutters are spaced apart. A metal detection module and a cutting module are installed on the central crushing cutter. Both the metal detection module and the cutting module are electrically connected to the controller. The metal detection module includes a focusing electrode for detecting the position and shape of metal. Several focusing electrodes are uniformly arranged in a linear array on the central crushing blade. The interior of the central crushing blade is provided with a first mounting hole corresponding to each focusing electrode. The focusing electrodes are arranged in the first mounting holes along the height direction of the central crushing blade. The focusing electrodes are electrically connected to the controller. The metal detection module also includes a magnetic detector for detecting ferromagnetic metals. A second mounting hole is provided at one end of the central crushing blade near the center of the blade holder. The magnetic detector is installed in the second mounting hole and is electrically connected to the controller. The cutting module includes a high-pressure water jet cutting head for cutting metal, a third mounting hole for mounting the cutting head is provided on the central crushing blade, and the inside of the blade holder is provided with a pipeline hole and a clearance hole for the connecting pipe of the cutting head to pass through.

2. The composite tunneling cutterhead according to claim 1, characterized in that: The adjustment structure includes a mounting groove on the cutter holder, sliding grooves on both sides of the mounting groove, a cutter head mounted on a slide block located within the mounting groove, and sliders adapted to the sliding grooves on both sides of the slide block located within and slidably connected to the sliding grooves; the slide block slides within the mounting groove to adjust the digging diameter between the cutters.

3. A composite tunneling cutterhead according to claim 2, characterized in that: The cutter holder is provided with mounting platforms that correspond one-to-one with the central crushing cutter. The mounting platforms are located between the roller cutters. The mounting platforms are provided with clearance grooves for pipelines to pass through. The central crushing cutter is fixed on the mounting platform, with the end of the central crushing cutter closest to the axis of the cutter holder abutting against it. The end of the central crushing cutter away from the cutter holder is provided with a slot for mounting the blade.

4. A composite tunneling cutterhead according to claim 3, characterized in that: The central crusher blade has a central groove for mounting a focusing electrode at one end near the center of the blade holder. The central grooves at the ends of several central crusher blades are joined together to form a mounting hole for mounting the central focusing electrode of the blade holder.

5. A composite tunneling cutterhead according to claim 4, characterized in that: The cutting head includes a body, a connector, and a nozzle. The connector and nozzle are connected through the body, and the body is connected to a connecting pipe through the connector. The connector has a first water chamber inside, the diameter of which is smaller than the diameter of the connecting pipe. The end of the first water chamber is connected to the connecting pipe through a flared opening. The body has a second water chamber inside, the diameter of which is larger than the diameter of the first water chamber. The first water chamber is connected to the second water chamber through the flared opening. The nozzle has a spray chamber inside, the diameter of which is smaller than the diameter of the first water chamber. The second water chamber is connected to the spray chamber through the flared opening. Water enters the cutting head, is accelerated, and forms a high-speed jet for metal cutting.

6. A composite tunneling cutterhead according to claim 5, characterized in that: The cutter holder is equipped with a scraper, which is located on one side of the roller cutter and between the roller cutter and the central crushing cutter.

7. A tunneling device, characterized in that: Includes the composite tunneling cutterhead as described in claim 6, wherein the composite tunneling cutterhead is connected to an external moving device via a connecting seat, and the connecting seat has a central hole for pipelines to pass through.

8. A tunneling method based on the tunneling device of claim 7, characterized in that, Includes the following steps: S1. Adjust the position of the slide block in the installation slot according to the tunneling requirements, and adjust the digging radius of the cutter head; S2. Start the metal detection module. During the excavation process, the focusing electrode and magnetic detector of the metal detection module will detect the deeply buried metal. The controller will adjust the attitude of the cutter head according to the detection results to avoid collision and interference with the detected metal parts; S3. When it is necessary to cut the detected metal parts, start the cutting module. High-pressure water will cut the metal parts through the cutting head.

Images