Peeling Tools

Abstract

The present invention is a rotary cutting tool, comprising an annular fixed plate, a driving assembly and a rotary cutting cutter ring, wherein the driving assembly can be rotatably inserted into the fixed plate, the driving assembly is connected to the rotary cutting cutter ring and can drive the rotary cutting cutter ring to rotate. The rotary cutting tool in the present invention can significantly improve the rotary cutting rock breaking efficiency by realizing self-driving capability.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel excavation, and in particular to a rotary cutting tool. Background Art

[0002] The cutter is the teeth of tunnel boring equipment. Common cutters include disc cutters for TBM and shield machines, and picks for coal mining machines and cantilever tunnel boring machines. The disc cutter ring contacts the rock to generate friction to achieve rotation, and its rotation speed is very low. It mainly relies on forward thrust to crush the rock to achieve rock breaking. With the development of rock breaking technology, rotary cutting has higher efficiency than forward thrust rock breaking, but the cutters used in the current research on rotary cutting rock breaking are still mainly disc cutter structures. Relevant studies have shown that when rotary cutting rock breaking is used, the cutter needs a higher rotation speed, and continuous cutting of the rock can obtain higher rock breaking specific energy, but the design method and research content of the relevant cutters are relatively blank. Therefore, it is very necessary to design a new type of cutter suitable for rotary cutting rock breaking theory.

[0003] Therefore, the inventor, relying on his many years of experience and practice in related industries, proposes a rotary cutting tool to overcome the defects of the prior art. Summary of the invention

[0004] The object of the present invention is to provide a rotary cutting tool which can significantly improve the rotary cutting rock breaking efficiency by realizing self-driving capability.

[0005] The object of the present invention is achieved by a rotary cutting tool comprising:

[0006] an annular fixing plate;

[0007] A driving assembly rotatably inserted into the fixed plate;

[0008] And the rotary cutting knife ring, the driving component is connected with the rotary cutting knife ring and can drive the rotary cutting knife ring to rotate.

[0009] In a preferred embodiment of the present invention, the drive assembly includes a drive shaft and a connecting plate arranged at one end of the drive shaft, a bearing is sleeved on the drive shaft and located between the connecting plate and the fixed plate, the outer ring of the bearing is fixedly connected to the fixed plate, the inner ring of the bearing is circumferentially fixed to the drive shaft and fixedly connected to the connecting plate, and the rotary cutter ring is sleeved on the outer side of the bearing and fixedly connected to the connecting plate.

[0010] In a preferred embodiment of the present invention, a stepped hole connected to the inner hole of the fixed plate and with an increased aperture is provided on the plate surface of the fixed plate, and the stepped hole can be connected to the ball in the bearing; an oil filling hole and a balancing hole are provided on the fixed plate, and both the oil filling hole and the balancing hole are connected to the stepped hole, the oil filling hole is used to install the oil filling device, and the balancing hole is used to install the air plug.

[0011] In a preferred embodiment of the present invention, a first rotating sealing ring is sandwiched between the drive shaft and the fixed plate, a mounting hole is opened on the connecting plate, the end of the drive shaft extends into the mounting hole and a first sealing ring is sandwiched between the drive shaft and the hole wall of the mounting hole, and a second rotating sealing ring is sandwiched between the inner wall of the rotary cutting ring and the outer wall of the fixed plate.

[0012] In a preferred embodiment of the present invention, the rotary cutting cutter ring includes an annular cutter ring body and at least two annular blades arranged outside the cutter ring body and spaced apart along its axial direction. The cutter ring body is sleeved on the outside of the bearing and fixedly connected to the connecting plate.

[0013] In a preferred embodiment of the present invention, a central high-pressure water channel is provided in the drive shaft and passes through both ends thereof, a cavity which can be communicated with the high-pressure water channel is provided in the connecting plate, a first high-pressure water channel which is communicated with the cavity is also provided in the connecting plate, and at least one second high-pressure water channel is provided in the rotary cutting ring, and the second high-pressure water channel can be communicated with the first high-pressure water channel and the interval area between two adjacent annular blades.

[0014] In a preferred embodiment of the present invention, a plurality of first high-pressure water channels are opened in the connecting plate along the circumference of the drive shaft, and an annular groove is opened in the outer peripheral wall of the connecting plate, and each first high-pressure water channel is connected to the annular groove; a plurality of intermediate water channels are opened in the rotary cutting knife ring along its circumference, and the intermediate water channels are connected to the annular groove and to each second high-pressure water channel.

[0015] In a preferred embodiment of the present invention, a second sealing ring and a third sealing ring are respectively disposed between the connecting plate and the rotary cutting cutter ring and on both sides of the annular groove.

[0016] In a preferred embodiment of the present invention, a first check valve is provided in the central high-pressure water channel, and a second check valve is provided in the second high-pressure water channel.

[0017] In a preferred embodiment of the present invention, the axis of the rotary cutting cutter ring is parallel to and offset from the axis of the driving shaft.

[0018] In a preferred embodiment of the present invention, the first end and the second end of the rotary cutting knife ring are respectively arranged close to the connecting plate and the fixed plate, each annular blade is arranged inclined outward from the first end of the rotary cutting knife ring to the second end, and the outer end diameter of each annular blade gradually increases from the first end to the second end of the rotary cutting knife ring.

[0019] In a preferred embodiment of the present invention, in a cross section along the axis of the rotary cutting cutter ring, the contact points on the tip of each annular blade that can contact the rock are all located on the same inclined line.

[0020] In a preferred embodiment of the present invention, the angle between the normal line of the annular blade at the contact point and the plate surface of the fixed plate is 20-70°.

[0021] In a preferred embodiment of the present invention, the outer wall surface of each annular blade includes a conical surface close to the first end of the rotary cutting ring and a plane close to the second end of the rotary cutting ring, and the diameter of the conical surface gradually increases from the first end to the second end of the rotary cutting ring; the connection between the conical surface and the plane is an arc surface, and the connection between the plane and the conical surface between two adjacent annular blades is a transition arc surface, and the contact point on the annular blade is located on the arc surface.

[0022] As described above, the rotary cutting tool in the present invention fixes the fixed plate to the mechanical arm of the tunnel boring machine when in use. While the entire rotary cutting tool can move with the mechanical arm, the driving component can also drive the rotary cutting cutter ring to rotate independently, so that the entire rotary cutting tool has autonomous driving capability. When applied to rotary cutting and rock breaking technology, the rotary cutting tool can have a higher rotation speed, which is significantly beneficial for improving the rotary cutting and rock breaking efficiency, thereby filling the gap in the current field of rotary cutting tools specifically used for rotary cutting and rock breaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The following drawings are only intended to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0024] in:

[0025] Figure 1 : A structural diagram of the rotary cutting tool provided by the present invention.

[0026] Figure 2 :for Figure 1 Cross-sectional view along AA direction.

[0027] Figure 3 :for Figure 2 A partial enlarged view of the first rotating sealing ring.

[0028] Figure 4 : A schematic diagram of the rotary cutting tool provided by the present invention in contact with rock.

[0029] Figure 5 :for Figure 4 A partial enlarged view of the middle annular blade.

[0030] Description of Figure Numbers:

[0031] 1. Fixing plate; 11. First bolt; 12. Threaded hole; 13. Step hole; 14. Oil filling hole; 15. Balance hole; 16. Ventilation plug; 17. First rotating sealing ring; 18. Second rotating sealing ring;

[0032] 2. Drive shaft; 21. External spline; 22. Center high-pressure water channel;

[0033] 3. Bearings;

[0034] 4. connecting plate; 41. second bolt; 42. third bolt; 43. first sealing ring; 44. cavity; 45. first high-pressure water channel; 46. annular groove; 47. second sealing ring; 48. third sealing ring;

[0035] 5. Peeling knife ring; 51. Knife ring body; 52. Annular blade; 521. Conical surface; 522. Plane; 53. Middle water channel; 54. Second high-pressure water channel;

[0036] 6. Rock; 61. Crack. DETAILED DESCRIPTION

[0037] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0038] like Figures 1 to 5 As shown, this embodiment provides a rotary cutting tool, comprising:

[0039] An annular fixing plate 1;

[0040] A driving assembly, which is rotatably disposed in the fixing plate 1;

[0041] And the rotary cutting knife ring 5, the driving component is connected with the rotary cutting knife ring 5 and can drive the rotary cutting knife ring 5 to rotate.

[0042] Therefore, the rotary cutting tool in this embodiment, when in use, fixes the fixed plate 1 to the mechanical arm of the tunnel boring machine. While the entire rotary cutting tool can move with the mechanical arm, the driving component can also drive the rotary cutting cutter ring 5 to rotate independently, so that the entire rotary cutting tool has autonomous driving capability. When applied to rotary cutting and rock breaking technology, the rotary cutting tool can have a higher rotation speed, which is significantly beneficial for improving the rotary cutting and rock breaking efficiency, so as to fill the gap in the current field of rotary cutting tools used specifically for rotary cutting and rock breaking.

[0043] The rotary cutting tool in this embodiment is generally used in combination with a flexible arm tunnel boring machine. The flexible arm tunnel boring machine includes a frame and a flexible mechanical arm. The flexible mechanical arm includes six oil cylinders arranged in parallel and two end plates at both ends. The two ends of the oil cylinder are hinged to the two end plates, which can provide six degrees of freedom in six directions. The number of the rotary cutting tool can be only one, which is installed at the front end of the flexible mechanical arm, and the fixed plate 1 is fixed to the corresponding end plate in the flexible mechanical arm. It can move with the flexible mechanical arm and drive the rotary cutting knife ring 5 to rotate through the driving component. Of course, according to needs, multiple rotary cutting tools can also be integrated on a cutter disc, and the cutter disc is fixed to the flexible mechanical arm. Each rotary cutting tool can be driven to rotate separately through the driving component. In actual use, it is more preferred to use a rotary cutting tool installed on the mechanical arm of the tunnel boring machine, so that the rotary cutting knife ring 5 can better contact with the rock and improve the rock breaking efficiency.

[0044] In a specific implementation, the drive assembly includes a drive shaft 2 and a connecting plate 4 arranged at one end of the drive shaft 2. A bearing 3 is sleeved on the drive shaft 2 and located between the connecting plate 4 and the fixed plate 1. The outer ring of the bearing 3 is fixedly connected to the fixed plate 1, and the inner ring of the bearing 3 is circumferentially fixed to the drive shaft 2 and fixedly connected to the connecting plate 4. The rotary cutting knife ring 5 is sleeved on the outer side of the bearing 3 and fixedly connected to the connecting plate 4.

[0045] The fixing plate 1 can be fixed to the outer ring of the bearing 3 by the first bolt 11, and can be installed and fixed to the mechanical arm of the tunnel boring machine by the threaded hole 12 provided thereon, so that the entire rotary cutting tool can move with the mechanical arm. An inner spline is provided on the inner ring of the bearing 3, which cooperates with the outer spline 21 provided on the outer wall of the driving shaft 2 to achieve circumferential fixation of the two. When the driving shaft 2 rotates, the inner ring of the bearing 3 can be driven to rotate together. The connecting plate 4 can be fixed to the inner ring of the bearing 3 by the second bolt 41, and fixed to the first end of the rotary cutting cutter ring 5 by the third bolt 42, so as to drive the rotary cutting cutter ring 5 to rotate when the inner ring of the bearing 3 rotates. The driving assembly also includes a driving device, which is connected to the driving shaft 2 and can drive the driving shaft 2 to rotate. The driving device, for example, adopts an electric motor or a hydraulic motor to directly drive the driving shaft 2 to rotate, drive the inner ring of the bearing 3 and the connecting plate 4 to rotate together, and then drive the rotary cutting cutter ring 5 to rotate together.

[0046] Furthermore, a stepped hole 13 with an increased aperture is provided on the plate surface of the fixed plate 1 (specifically, the plate surface facing the bearing 3), which is connected to its inner hole (i.e., the through hole formed by the inner annular surface of the fixed plate 1), and the stepped hole 13 can be connected to the ball in the bearing 3; an oil filling hole 14 and a balancing hole 15 are provided on the fixed plate 1 (generally, the number of the oil filling hole 14 and the number of the balancing hole 15 are one each), and the oil filling hole 14 and the balancing hole 15 are both connected to the stepped hole 13, and the oil filling hole 14 is used to install an oil filling device to achieve lubrication of the bearing 3; the balancing hole 15 is used to install a breathable plug 16 to provide pressure balance for the internal sealing cavity.

[0047] In order to achieve sealing of the internal chamber, prevent leakage of lubricating oil in the bearing 3, and resist the entry of external pollutants such as dust, a first rotating sealing ring 17 is sandwiched between the drive shaft 2 and the fixed plate 1, a mounting hole is opened on the connecting plate 4, the end of the drive shaft 2 extends into the mounting hole and a first sealing ring 43 is sandwiched between the drive shaft 2 and the hole wall of the mounting hole, and a second rotating sealing ring 18 is sandwiched between the inner wall of the rotary cutting ring 5 and the outer wall of the fixed plate 1.

[0048] Specifically, a first annular sealing groove is opened on the inner wall of the fixed plate 1, and the first rotating sealing ring 17 is installed in the first annular sealing groove; the connecting plate 4 and the driving shaft 2 are installed in a shaft-hole matching manner, and a second annular sealing groove is opened in the hole wall of the mounting hole, and the first sealing ring 43 (O-ring) is installed in the second annular sealing groove; a third annular sealing groove is opened on the outer wall of the fixed plate 1, and the second rotating sealing ring 18 is installed in the third annular sealing groove, so as to realize the rotating seal between the fixed plate 1 and the second end of the rotary cutting knife ring 5.

[0049] Furthermore, the rotary cutting cutter ring 5 includes an annular cutter ring body 51 and at least two annular blades 52 arranged outside the cutter ring body 51 and spaced apart along the axial direction thereof. The cutter ring body 51 is sleeved on the outside of the bearing 3 and fixedly connected to the connecting plate 4 .

[0050] In order to facilitate cooling of each annular blade 52 and dust removal, a central high-pressure water channel 22 is opened in the drive shaft 2 and runs through both ends thereof, a cavity 44 which can be communicated with the high-pressure water channel is opened in the connecting plate 4, a first high-pressure water channel 45 which is communicated with the cavity 44 is also provided in the connecting plate 4, and at least one second high-pressure water channel 54 is opened in the rotary cutting ring 5, and the second high-pressure water channel 54 can be communicated with the first high-pressure water channel 45 and the interval area between two adjacent annular blades 52.

[0051] When in use, the central high-pressure water channel 22 is connected to the corresponding water pump and is used to pass high-pressure water. Generally, a groove connected to the mounting hole is opened in the connecting plate 4, and the diameter of the groove is larger than the aperture of the mounting hole. One end of the drive shaft 2 is inserted into the mounting hole and enclosed with the groove to form the above-mentioned cavity 44, which can realize the continued storage of high-pressure water and play a role in water pressure energy storage. In order to facilitate processing and installation, a plurality of first high-pressure water channels 45 are opened in the connecting plate 4 along the circumference of the drive shaft 2, and an annular groove 46 is opened on the outer peripheral wall of the connecting plate 4, and each first high-pressure water channel 45 is connected to the annular groove 46; a plurality of intermediate water channels 53 are opened in the rotary cutting cutter ring 5 along its circumference, and the intermediate water channel 53 is connected to the annular groove 46 and is connected to each second high-pressure water channel 54. The annular groove 46 can be used to ensure that the water flow enters the second high-pressure water channel 54 in the rotary cutting knife ring 5 more smoothly; the number of the second high-pressure water channel 54 is one less than the number of the annular blades 52, and it is set corresponding to the spacing area between two adjacent annular blades 52, so that the high-pressure water can be sprayed out from the spacing area between two adjacent annular blades 52, thereby having a better cooling effect on each annular blade 52.

[0052] Generally, a second sealing ring 47 and a third sealing ring 48 are sandwiched between the connecting plate 4 and the rotary cutting knife ring 5 and on both sides of the annular groove 46. The second sealing ring 47 and the third sealing ring 48 are both O-rings and are embedded in the corresponding sealing grooves on the outer wall of the connecting plate 4 to prevent leakage of high-pressure water. A first check valve (small valve) is provided in the central high-pressure water channel 22 to prevent water backflow; a second check valve (small valve) is provided in the second high-pressure water channel 54 to prevent dust from entering the channel and causing pipe blockage.

[0053] Furthermore, if Figure 2 As shown, the axis of the rotary cutting ring 5 is parallel to and offset from the axis of the drive shaft 2, that is, the axis of the rotary cutting ring 5 and the axis of the drive shaft 2 are both at an eccentric distance e, so that the rotary cutting tool can generate a sinusoidal impact in the contact area between the rotary cutting ring 5 and the rock when breaking the rock, further improving the rock breaking efficiency. The size of this spacing has an impact on the sinusoidal impact, and the size of the spacing determines the size of the impact load. When the diameter of the cutter disc remains unchanged, the larger the eccentric distance e, the stronger the impact load, and the faster the wear of the cutter disc. The specific size of the eccentric distance e depends on actual needs.

[0054] Preferably, the first end and the second end of the rotary cutting ring 5 are respectively arranged close to the connecting plate 4 and the fixed plate 1, and each annular blade 52 is arranged obliquely outward from the first end of the rotary cutting ring 5 to the second end. Since there is a certain fracture angle when the rock is broken, each annular blade 52 is arranged obliquely, so that each annular blade 52 has a certain angle when in contact with the rock, which can better adapt to the crushing angle of the rock and is more conducive to the crushing of the rock; and the outer end diameter of each annular blade 52 gradually increases from the first end to the second end of the rotary cutting ring 5 (that is, there is a blade spacing between two adjacent annular blades 52). The gradual increase is to gradually adapt to the fracturing angle of the rock, which is more conducive to rock breaking and reducing the wear of the rotary cutting tool.

[0055] Further preferably, in the cross section along the axis of the rotary cutting ring 5 (i.e., the axial longitudinal cross section of the rotary cutting ring 5), the contact points on the tip of each annular blade 52 that can contact the rock are all located on the same inclined line, which can better control the inclination angle of each annular blade 52 and is more conducive to rock breaking.

[0056] The blade inclination angle α of the annular blade 52 is the angle between the normal line of the annular blade 52 at the contact point and the plate surface of the fixed plate 1. This angle is mainly related to the fracturing angle (or fracture angle) of the rock. Too large or too small an angle will affect the rock breaking effect. The angle is preferably equal to the fracturing angle of the rock, and is specifically preferably 20-70°.

[0057] Generally, in order to facilitate design and processing, the first end and the second end of the rotary cutting ring 5 are respectively arranged close to the connecting plate 4 and the fixed plate 1, and the outer wall surface of each annular blade 52 includes a conical surface 521 close to the first end of the rotary cutting ring 5 and a plane 522 close to the second end of the rotary cutting ring 5. The diameter of the conical surface 521 gradually increases from the first end to the second end of the rotary cutting ring 5; the connection between the conical surface 521 and the plane 522 is an arc surface, and the connection between the plane 522 and the conical surface 521 between two adjacent annular blades 52 is a transition arc surface, and the contact point on the annular blade 52 is located on the arc surface.

[0058] When the rotary cutting tool is used to break rock, the contact between each annular blade 52 and the rock 6 is as follows: Figure 4 and Figure 5 As shown in FIG. 1 , during the rock breaking process, the cracks 61 generated by the rotary cutting action of the annular blade 52 are as shown in FIG. Figure 4As shown, the shape parameter design of the entire annular blade 52 can better adapt to the crushing angle of the rock 6, so that the annular blade 52 can more easily and efficiently crush the rock 6 along the crushing angle. In the cross section along the axis of the rotary cutting ring 5 mentioned above, the contact points on the tip of each annular blade 52 that can contact the rock are all located on the same inclined line, which is actually equivalent to that in the cross section, the centers of each arc surface on each annular blade 52 are all located on the same inclined line, and the inclined line is parallel to the above-mentioned inclined line. The above-mentioned blade inclination angle α actually also satisfies the following relationship: tanα=h / d, where h represents the blade spacing between two adjacent annular blades 52, which is equal to the distance between the contact points on the tips of two adjacent annular blades 52 that can contact the rock in the cross section along the axis of the rotary cutting ring 5 along the radial direction of the rotary cutting ring 5, and is also equal to the distance between the centers of each arc surface on two adjacent annular blades 52 in the cross section along the radial direction of the rotary cutting ring 5. d represents the difference in blade height between two adjacent annular blades 52, which is equal to the distance along the axial direction of the rotary cutting ring 5 between the contact points on the tips of two adjacent annular blades 52 that can contact the rock in the cross section along the axis of the rotary cutting ring 5, and is also equal to the distance along the axial direction of the rotary cutting ring 5 between the centers of the arc surfaces on the two adjacent annular blades 52 in the cross section.

[0059] In an optional embodiment, the arc surface and transition arc mentioned above may also be a plane or an acute angled inclined surface, or other shapes, which may be determined according to the specific needs of the tool to ensure the rock breaking effect.

[0060] The above are only exemplary embodiments of the present invention and are not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A rotary cutting tool, characterized in that: include: an annular fixing plate; A driving assembly, which is rotatably disposed in the fixing plate; and a rotary cutting cutter ring; the driving assembly comprises a driving shaft and a connecting plate arranged at one end of the driving shaft, a bearing is sleeved on the driving shaft and located between the connecting plate and the fixed plate, the outer ring of the bearing is fixedly connected to the fixed plate, the inner ring of the bearing is circumferentially fixed to the driving shaft and fixedly connected to the connecting plate, the rotary cutting cutter ring is sleeved on the outer side of the bearing and fixedly connected to the connecting plate; the driving assembly is connected to the rotary cutting cutter ring and can drive the rotary cutting cutter ring to rotate; the rotary cutting cutter ring comprises an annular cutter ring body and a cutter ring body arranged outside the cutter ring body At least two annular blades are arranged on the side and spaced apart along its axial direction, the blade ring body is sleeved on the outer side of the bearing and fixedly connected to the connecting plate; the first end and the second end of the rotary cutting blade ring are respectively arranged close to the connecting plate and the fixed plate, each of the annular blades is inclined outward from the first end of the rotary cutting blade ring to the second end, and the outer end diameter of each annular blade gradually increases from the first end to the second end of the rotary cutting blade ring; in the cross section along the axis of the rotary cutting blade ring, the contact points on the tip of each annular blade that can contact the rock are all located on the same inclined line.

2. The rotary cutting tool according to claim 1, characterized in that: A stepped hole connected to the inner hole of the fixed plate and having an increased aperture is provided on the plate surface of the fixed plate, and the stepped hole can be connected to the ball in the bearing; an oil filling hole and a balancing hole are provided on the fixed plate, and both the oil filling hole and the balancing hole are connected to the stepped hole, the oil filling hole is used to install an oil filling device, and the balancing hole is used to install a breathable plug.

3. The rotary cutting tool according to claim 1, characterized in that: A first rotating sealing ring is sandwiched between the driving shaft and the fixed plate, a mounting hole is opened on the connecting plate, the end of the driving shaft extends into the mounting hole and a first sealing ring is sandwiched between the driving shaft and the hole wall of the mounting hole, and a second rotating sealing ring is sandwiched between the inner wall of the rotary cutting knife ring and the outer wall of the fixed plate.

4. The rotary cutting tool according to claim 1, characterized in that: A central high-pressure water channel is provided in the drive shaft and runs through both ends thereof, a cavity which can communicate with the central high-pressure water channel is provided in the connecting plate, a first high-pressure water channel which can communicate with the cavity is also provided in the connecting plate, and at least one second high-pressure water channel is provided in the rotary cutting ring, and the second high-pressure water channel can communicate with the first high-pressure water channel and the interval area between two adjacent annular blades.

5. The rotary cutting tool according to claim 4, characterized in that: A plurality of first high-pressure water channels are opened in the connecting plate along the circumferential direction of the drive shaft, and an annular groove is opened in the outer peripheral wall of the connecting plate, and each of the first high-pressure water channels is connected to the annular groove; a plurality of intermediate water channels are opened in the rotary cutting knife ring along its circumferential direction, and the intermediate water channels are connected to the annular groove and to each of the second high-pressure water channels.

6. The rotary cutting tool according to claim 5, characterized in that: A second sealing ring and a third sealing ring are respectively disposed between the connecting plate and the rotary cutting cutter ring and on both sides of the annular groove.

7. The rotary cutting tool according to claim 5, characterized in that: A first check valve is provided in the central high-pressure water channel, and a second check valve is provided in the second high-pressure water channel.

8. The rotary cutting tool according to claim 1, characterized in that: The axis of the rotary cutting knife ring is parallel to and deviates from the axis of the driving shaft.

9. The rotary cutting tool according to claim 1, characterized in that: The angle between the normal line of the annular blade at the contact point and the plate surface of the fixing plate is 20-70°.

10. The rotary cutting tool according to claim 1, characterized in that: The outer wall surface of each annular blade includes a conical surface close to the first end of the rotary cutting blade ring and a plane close to the second end of the rotary cutting blade ring, and the diameter of the conical surface gradually increases from the first end to the second end of the rotary cutting blade ring; the connection between the conical surface and the plane is an arc surface, and the connection between the plane and the conical surface between two adjacent annular blades is a transition arc surface, and the contact point on the annular blade is located on the arc surface.

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