Water jet tunneling machine center rotation mechanism and sand blocking treatment method

Abstract

This invention belongs to the technical field of abrasive waterjet tunnel boring machine components, and provides a central rotating mechanism for a waterjet tunnel boring machine and a method for sand blocking. The central rotating mechanism includes a central tube shaft, one end of which is fixedly connected to the center of the tunnel boring machine cutterhead and rotates around the axis of the tube shaft with the rotating cutterhead; the input end of an abrasive conveying device is connected to a sand supply bin, and the output end is connected to the abrasive waterjet cutting terminal; an abrasive flow rate regulating device is installed on the abrasive conveying device to regulate the abrasive flow rate supplied to the abrasive waterjet cutting terminal; an abrasive mixing device is installed on the central tube shaft located inside the sand supply bin to mix the abrasive inside the sand supply bin; a high-pressure water conveying device outputs high-pressure water to the abrasive waterjet cutting terminal; and a high-pressure air conveying device outputs high-pressure air to the abrasive waterjet cutting terminal. This invention ensures a stable and effective supply of abrasive, high-pressure water, and high-pressure air to the tunnel boring machine.

Description

Technical Field

[0001] This invention belongs to the technical field of abrasive waterjet tunnel boring machine components, and particularly relates to a central rotation mechanism for a waterjet tunnel boring machine and a method for sand blocking treatment. 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] (Full-face) tunnel boring machines (TBMs) are widely used in the construction of tunnels for highways, railways, and urban subways due to their advantages such as fast construction speed, high-quality tunneling, and high safety. However, when TBMs encounter high-strength, highly abrasive hard rock or underground reinforced concrete obstacles, traditional mechanical tunneling faces engineering problems such as abnormal damage to the cutterhead and cutting tools, and machine jamming, resulting in low safety and slow construction speed. These problems are caused by insufficient rock-breaking ability of the mechanical cutting tools. To solve the problem of insufficient rock-breaking ability of traditional TBMs, and given the strong cutting ability of abrasive waterjet, abrasive waterjet-assisted cutting technology for TBM mechanical cutting tools has emerged.

[0004] To achieve abrasive waterjet-assisted mechanical cutting, the abrasive, high-pressure air, and high-pressure water required to form the abrasive waterjet need to be supplied externally to the abrasive waterjet cutting terminal fixed on a rotating cutter head. This presents the challenge of separating dynamic and static transmission. Secondly, since abrasive waterjet cutting primarily achieves its effect through the erosive action of high-speed abrasive particles, the abrasive supply significantly impacts the abrasive waterjet-assisted mechanical cutting performance. Current technology mainly utilizes the "negative pressure" generated by the high-speed waterjet to draw abrasive from the abrasive supply chamber through the abrasive pipeline into the mixing pipe, where the high-speed waterjet mixes with the abrasive to form the abrasive waterjet. However, this abrasive supply method is affected by the rotation of the cutterhead and a large installation radius. Specifically, when the abrasive waterjet cutting terminal moves to the upper half of the cutterhead, the abrasive is difficult to enter the mixing pipe through negative pressure due to its own weight. When the abrasive waterjet cutting terminal is located on the lower half of the cutterhead, its own weight promotes the entry of abrasive into the mixing pipe. When the installation radius is large, the abrasive cannot be effectively drawn in by negative pressure. This results in difficulty in supplying, metering, and stability of the abrasive, leading to uneven jet cutting effect. In addition, the particle size of commonly used abrasives is not uniform. The abrasive in the sand supply chamber may segregate due to factors such as the vibration of the tunneling machine, which greatly inhibits the performance of the abrasive waterjet.

[0005] Meanwhile, during operation, abrasive waterjet cutting terminals are prone to sand blockage caused by "backflow," which prevents the abrasive from being supplied to the terminal properly. Consequently, the abrasive waterjet cannot achieve its efficient cutting capability due to a lack of abrasive. Existing methods for addressing sand blockage typically involve disassembling and repairing relevant components, which significantly impacts construction efficiency.

[0006] In summary, the existing abrasive waterjet assisted tunneling machine cutting technology has the following problems: the abrasive supply is difficult due to the rotation of the cutterhead and the large installation radius; the abrasive flow rate is unstable and difficult to control precisely; segregation is very likely to occur during the abrasive transportation process; and the transportation of high-pressure water and high-pressure air is difficult and causes sand blockage, ultimately resulting in an unstable and ineffective supply of abrasive, high-pressure water, and high-pressure air to the tunneling machine. Summary of the Invention

[0007] In order to solve the technical problems existing in the background art, the present invention provides a central rotation mechanism for a water jet tunneling machine and a method for sand blocking treatment, which can ensure a stable and effective supply of abrasive, high-pressure water and high-pressure air on the tunneling machine.

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

[0009] The first aspect of the present invention provides a center rotation mechanism for a waterjet tunneling machine.

[0010] A waterjet tunneling machine center rotation mechanism includes: a sand supply bin, a central tube shaft, an abrasive conveying device, an abrasive flow regulating device, an abrasive mixing device, a high-pressure water conveying device, and a high-pressure air conveying device;

[0011] One end of the central tube shaft axially passes through the sand supply bin and is coaxial with the sand supply bin, while the other end is fixedly connected to the center of the tunneling machine cutterhead and rotates around the axis of the central tube shaft with the rotating cutterhead.

[0012] The input end of the abrasive conveying device is connected to the sand supply bin, and the output end is connected to the abrasive waterjet cutting terminal; the abrasive flow rate regulating device is installed on the abrasive conveying device and is used to regulate the abrasive flow rate supplied by the abrasive conveying device to the abrasive waterjet cutting terminal; the abrasive stirring device is installed on the central tube shaft located inside the sand supply bin and is used to stir and mix the abrasive inside the sand supply bin.

[0013] The high-pressure water delivery device is installed inside the central tube shaft and is used to output high-pressure water to the abrasive waterjet cutting terminal; the high-pressure air delivery device is installed inside the central tube shaft and is used to output high-pressure air to the abrasive waterjet cutting terminal.

[0014] In one embodiment, the sand supply bin includes: a static sand bin, an air outlet pipe, and a rotating baffle.

[0015] The bottom of the static sand bin is provided with a bottom plate through hole, and the central tube shaft passes through the bottom plate through hole and is slidably connected to the static sand bin;

[0016] The air outlet pipe is installed on the static sand chamber, with one end extending into the interior of the static sand chamber and the inner end of the air outlet pipe located at the horizontal line corresponding to the maximum volume of the abrasive in the static sand chamber; the other end of the air outlet pipe is placed outside the static sand chamber.

[0017] The rotating partition is fixedly connected to the central tube shaft, rotates with the central tube shaft, and is slidably and sealingly connected to the static sand chamber.

[0018] In one implementation, the static sand chamber is fixedly connected to the outside and does not rotate with the central tube shaft.

[0019] In one embodiment, the static sand bin is provided with a feed inlet, which is sealed to an external abrasive supply device pipeline for adding abrasive from the outside into the sand supply bin;

[0020] In one implementation, the sand silo is provided with an air inlet. When cleaning up sand blockage, high-pressure gas is introduced into the sand silo from an external high-pressure gas source through the air inlet.

[0021] In one embodiment, the abrasive conveying device includes: bearings, gears, helical blades, and abrasive pipelines;

[0022] The bearing is installed in the through hole of the partition plate, and the through hole of the partition plate is set on the rotating partition plate; the outer ring of the bearing is fixedly connected to the inner wall of the through hole of the partition plate;

[0023] The gear teeth mesh with the gear ring, which is mounted on the static sand chamber; the gear shaft is fixedly connected to the inner ring of the bearing, and the gear shaft is provided with a gear shaft through hole.

[0024] One end of the spiral blade passes through the inner ring of the bearing and is fixedly connected to the through hole of the gear shaft; the other end is located inside the static sand chamber and is in a free state.

[0025] The abrasive pipeline input end is slidably connected to the outer edge of the gear shaft through hole on the outside of the gear shaft, and the axes of the two coincide; the abrasive pipeline output end is connected to the abrasive flow regulating device.

[0026] The internal space of the abrasive pipeline is filled with abrasive, and the abrasive flow regulating device is installed at the output end of the abrasive pipeline. The other end of the abrasive flow regulating device is close to the abrasive waterjet cutting terminal.

[0027] This allows for precise adjustment of the abrasive flow rate, unaffected by the installation radius or the rotation of the cutter head. The abrasive flow rate is fully and precisely controllable through the combined operation of the abrasive conveying device and the abrasive flow rate regulating device.

[0028] In one embodiment, the outer edge of the through hole on the inner side of the rotating partition is fixedly connected to the spiral blade cover.

[0029] As an alternative implementation, the abrasive flow rate regulating device can be controlled manually or automatically.

[0030] As an alternative implementation, the abrasive stirring device includes a stirring mechanism and a connecting member, wherein the stirring mechanism is detachably mounted on the central tube shaft via the connecting member.

[0031] The stirring mechanism includes several stirring blades / stirring teeth.

[0032] In one embodiment, the high-pressure water conveying device includes: a still water tank, a water distribution tank, and a water outlet pipe;

[0033] The still water chamber is located outside the central tube shaft and is stationary, not rotating with the central tube shaft; the still water chamber is also provided with a water inlet for supplying high-pressure water into the still water chamber;

[0034] The water distribution chamber is located inside the central tube shaft, is stationary relative to the central tube shaft, and is connected to the still water chamber by a sliding seal.

[0035] The water outlet pipe is installed on the water distribution chamber and is used to output high-pressure water to the abrasive waterjet cutting terminal.

[0036] In one embodiment, the central tube shaft is provided with a side hole for providing a window for the water outlet pipe to extend from the inside of the central tube shaft to the abrasive waterjet cutting terminal.

[0037] In one embodiment, the high-pressure gas delivery device includes: a static gas chamber, a gas distribution chamber, and a gas outlet pipe;

[0038] The static air chamber is located outside the central tube shaft and is in a stationary state, not rotating with the central tube shaft; the static air chamber is also provided with an air inlet for supplying high-pressure gas into the static air chamber;

[0039] The gas distribution chamber is located inside the central tube shaft, is stationary relative to the central tube shaft, and is connected to the static gas chamber by a sliding seal.

[0040] The air outlet pipe is installed on the air distribution chamber and is used to output high-pressure air to the abrasive waterjet cutting terminal.

[0041] In one embodiment, the central tube shaft is provided with side holes for providing windows for the water outlet pipe and the air outlet pipe to extend from the inside of the central tube shaft to the abrasive waterjet cutting terminal.

[0042] A second aspect of the present invention provides a method for treating sand blockage in the central rotary mechanism of a waterjet tunneling machine as described above.

[0043] A method for treating sand blockage in the center rotary mechanism of a waterjet tunneling machine as described above, comprising:

[0044] Control the cutter head to stop rotating and advancing, and stop the external supply of abrasive to the sand supply chamber;

[0045] Empty the remaining abrasive from the abrasive supply bin;

[0046] Block the feed inlet and the air outlet;

[0047] Turn on the abrasive flow rate regulating device corresponding to the abrasive waterjet cutting terminal where sand blockage has occurred, and turn off all other abrasive flow rate regulating devices.

[0048] High-pressure gas is supplied to the sand supply bin from an external high-pressure gas source through the air inlet.

[0049] The sand blockage has been cleared.

[0050] The beneficial effects of this invention are:

[0051] 1. The central rotary mechanism of the water jet tunneling machine of the present invention realizes the dynamic-static separation and transmission of abrasive, high-pressure water and high-pressure air from the outside to the abrasive water jet cutting terminal. The present invention makes full use of the structural space by installing a high-pressure water conveying device and a high-pressure air conveying device in the internal space of the central tube shaft.

[0052] 2. This invention actively supplies abrasive to the abrasive waterjet cutting terminal through an abrasive conveying device, which solves the problem that the abrasive waterjet cutting terminal on the cutter head has insufficient abrasive absorption capacity due to its large installation radius, resulting in little or no abrasive in the abrasive waterjet.

[0053] 3. This invention achieves effective regulation of abrasive flow rate by combining an abrasive flow rate regulating device and an abrasive conveying device, thereby achieving precise control of the cutting performance of the abrasive waterjet.

[0054] 4. This invention uses the rotational power of the cutter head to drive the abrasive conveying device and abrasive stirring device through the central tube shaft, avoiding the need for an external power source, preventing the structure from becoming too complex, and improving the overall reliability of the device.

[0055] 5. This invention solves the problem of abrasive segregation that is easily caused by factors such as mechanical vibration through an abrasive stirring device, effectively ensuring the performance of abrasive waterjet cutting.

[0056] 6. In this invention, the abrasive enters the sand supply chamber through the feed inlet via the pipeline of the external abrasive supply device. The air displaced by the abrasive entering the sand supply chamber is discharged through the air outlet pipe. When the abrasive is continuously supplied to the point where it does not overflow the air outlet pipe, external abrasive cannot be added to the sand supply chamber. The feed inlet and the exhaust pipe work together to ensure that the abrasive in the sand supply chamber is always full.

[0057] 7. This invention provides a fast and effective method for clearing sand blockage problems, saving time wasted on equipment maintenance due to sand blockage, indirectly improving the efficiency of abrasive waterjet cutting construction, and bringing a better experience to users.

[0058] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0059] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0060] Figure 1 This is a three-dimensional structural schematic diagram of the central rotary mechanism of the water jet tunneling machine according to an embodiment of the present invention;

[0061] Figure 2 A three-dimensional structural diagram of an active sand supply device without an abrasive flow rate regulating device;

[0062] Figure 3 for Figure 1 A perspective view of the abrasive conveying device shown in the figure;

[0063] Figure 4 for Figure 1 A cross-sectional view of the abrasive conveying device shown;

[0064] Figure 5 for Figure 1 A three-dimensional view of the sand supply bin shown;

[0065] Figure 6 for Figure 1 The cross-sectional view shown is of the sand supply bin, central tube shaft, and abrasive mixing device.

[0066] Figure 7 for Figure 6 A perspective view of the central tube shaft and the abrasive mixing device shown;

[0067] Figure 8 for Figure 1 The diagram shows a cross-sectional view of the central tube shaft and the abrasive mixing device.

[0068] Figure 9 for Figure 6 A perspective view of the abrasive mixing device shown;

[0069] Figure 10 A three-dimensional diagram of a high-pressure water conveying device and a high-pressure air conveying device.

[0070] Figure 11Cross-sectional view of the high-pressure water conveying device and the high-pressure gas conveying device.

[0071] in:

[0072] 1. Sand supply bin; 11. Static sand bin; 111. Bottom plate through hole; 112. Sliding seal; 12. Feed inlet; 13. Gear ring; 14. Rotating partition; 141. Partition through hole; 142. Sliding seal; 15. Air outlet pipe; 16. Air inlet;

[0073] 2. Abrasive mixing device; 21. Mixing teeth; 22. Bolt;

[0074] 3. Central tube shaft; 31. Side hole;

[0075] 4. Abrasive conveying device; 41. Bearing; 42. Gear; 421. Gear shaft through hole; 422. Sliding joint; 43. Helical blade cover; 44. Helical blade; 45. Abrasive pipeline;

[0076] 5. Abrasive flow rate regulating device;

[0077] 6. High-pressure water conveying device; 61. Static water tank; 611. Water inlet; 62. Water distribution tank; 621. Water outlet pipe; 63. Sliding seal;

[0078] 7. High-pressure gas conveying device; 71. Static air chamber; 711. Air inlet pipe; 72. Air distribution chamber; 721. Air outlet pipe; 73. Sliding seal;

[0079] 8. Abrasive waterjet cutting terminal;

[0080] 9. Tunneling machine cutterhead. Detailed Implementation

[0081] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0082] It should be noted that the following detailed description is illustrative and intended to provide further explanation 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.

[0083] 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.

[0084] like Figures 1-4As shown, the central slewing mechanism of a water jet tunneling machine in this embodiment includes: a sand supply bin 1, a central tube shaft 3, an abrasive conveying device 4, an abrasive flow regulating device 5, an abrasive mixing device 2, a high-pressure water conveying device 6, and a high-pressure air conveying device 7.

[0085] One end of the central tube shaft 3 axially passes through the sand supply chamber 1 and is coaxial with the sand supply chamber 1, while the other end is fixedly connected to the center of the tunneling machine cutterhead 9 and rotates around the central tube shaft axis with the rotating cutterhead.

[0086] The input end of the abrasive conveying device 4 is connected to the sand supply bin 1, and the output end is connected to the abrasive waterjet cutting terminal 8; the abrasive flow rate regulating device 5 is installed on the abrasive conveying device 4 and is used to regulate the abrasive flow rate supplied by the abrasive conveying device 4 to the abrasive waterjet cutting terminal 8; the abrasive stirring device 2 is installed on the central tube shaft 3 located inside the sand supply bin 1 and is used to stir and mix the abrasive inside the sand supply bin 1.

[0087] The high-pressure water delivery device 6 is installed inside the central tube shaft 3 and is used to output high-pressure water to the abrasive waterjet cutting terminal 8; the high-pressure air delivery device 7 is installed inside the central tube shaft 3 and is used to output high-pressure air to the abrasive waterjet cutting terminal 8.

[0088] In this embodiment, the limiting cooperation between the abrasive conveying device 4, the central tube shaft 3, and the sand supply bin 1 enables the central tube shaft 3 to drive the abrasive conveying device 4 using the rotational power of the cutter head. This avoids the problem of power transmission difficulties caused by providing power to the abrasive conveying device 4 from an external power source, and improves reliability.

[0089] The abrasive flow rate supplied by the abrasive conveying device 4 to the abrasive waterjet cutting terminal 8 is adjusted by the abrasive flow rate regulating device 5, thereby controlling the cutting performance of the abrasive waterjet by adjusting the abrasive flow rate.

[0090] In some embodiments, such as Figure 5 and Figure 6 As shown, the sand supply bin 1 includes: a static sand bin 11, a feed inlet 12, a gear ring 13, a rotating baffle 14, and an air outlet pipe 15. Specifically, the static sand bin 11 does not rotate with the central tube shaft 3, and the bottom of the static sand bin 11 is provided with a bottom plate through hole 111. The central tube shaft 3 passes through the bottom plate through hole 111 and is connected to the static sand bin 11 through a sliding seal 112.

[0091] The feed inlet 12 is located on the static sand bin 11 and is used to add abrasive from the outside into the sand supply bin 1;

[0092] Gear ring 13 is fixedly connected to the static sand chamber 11. The connection method can be bolt connection, welding, etc.

[0093] A rotating partition 14 is fixedly connected to the central tube shaft 3, rotates with the central tube shaft 3, and is sealed to the static sand chamber 11 through a sliding seal 142; a partition through hole 141 is provided on the rotating partition 14; an air outlet pipe 15 is provided on the static sand chamber 11, one end of which extends into the interior of the static sand chamber, with the inner end of the air outlet pipe located on the horizontal line corresponding to the maximum volume of abrasive in the static sand chamber 11; the other end is placed outside the static sand chamber; an air inlet 16 is provided on the static sand chamber 11.

[0094] Abrasive is fed into the sand supply chamber 1 through the feed inlet 12 via the pipeline of the external abrasive supply device. The air displaced by the abrasive entering the sand supply chamber 1 is discharged through the air outlet 15. When the abrasive is continuously supplied to the point that it does not overflow the air outlet 15, external abrasive cannot be added to the sand supply chamber 1. The feed inlet 12 and the air outlet 15 work together to ensure that the abrasive in the sand supply chamber is always full.

[0095] In this embodiment, the sand chamber 11 can be connected to an external, stationary frame. The gear ring 13 can be replaced by an internal gear or an external gear, etc.

[0096] In some other embodiments, such as Figures 2-5 As shown, the abrasive conveying device 4 includes: bearing 41, gear 42, spiral blade cover 43, spiral blade 44, and abrasive pipeline 45.

[0097] Bearing 41 is installed on the outer edge of the partition through hole 141, and the outer ring of bearing 41 is fixedly connected to the inner wall of the partition through hole 141; the gear teeth of gear 42 are configured to mesh with gear ring 13; the gear shaft of gear 42 is configured to be fixedly connected to the inner ring of bearing 41, and the gear shaft of gear 42 is provided with a gear shaft through hole 421; the spiral blade cover 43 is disposed in the partition through hole 141 on the inner side of the rotating partition 14 (the inner side of the sand supply chamber 1), and is fixedly connected to the inner ring of bearing 41; spiral One end of the blade 44 is set to pass through the inner ring of the bearing 41 and is fixedly connected to the gear shaft through hole 421; the other end is set inside the static sand chamber 11 and is in a free state; the input end of the abrasive pipeline 45 is set to be connected to the gear shaft through hole 421 on the outside of the gear 42 shaft (opposite to the sand chamber 1) through a sliding joint 422, which ensures that the rotation of the bearing 41 does not interfere with the abrasive pipeline 45 under the premise of normal abrasive transmission; the output end of the abrasive pipeline 45 is connected to the abrasive flow regulating device 5.

[0098] The abrasive pipeline 45 is filled with abrasive material, and the abrasive flow regulating device 5 is installed at the output end of the abrasive pipeline 45, with the other end of the abrasive flow regulating device 5 adjacent to the abrasive waterjet cutting terminal 8. This allows for precise adjustment of the abrasive flow rate, unaffected by the installation radius or the rotation of the cutter head. The abrasive flow rate is completely and precisely controllable through the cooperation of the abrasive conveying device and the abrasive flow regulating device.

[0099] like Figures 2-3 As shown, the cutter head drives the rotating partition 14 to rotate around the central tube shaft 3 via the central tube shaft 3, thereby causing the gear 42 on the rotating partition 14 to revolve around the central tube shaft 3. The gear ring 13, fixed to the static sand chamber 11, remains stationary with the static sand chamber 11, and has a relative motion tendency with the rotating partition 14, which is rotating. Under the combined action of the gear ring 13 and the gear 42 meshing, the gear 42 rotates. The rotating gear 42 drives the helical blade 44 to rotate, and under the combined action of the helical blade cover 43, the abrasive is conveyed outward from the sand supply chamber 1. Through the sliding joint 422, the abrasive pipeline 45 is prevented from rotating with the gear 42 while ensuring that the abrasive is normally conveyed to the abrasive pipeline 45.

[0100] Understandably, the number of abrasive conveying devices 4 can be adjusted according to actual needs; the type, size, gear ratio, and other parameters of gear ring 13 and gear 42 can be adjusted according to actual needs.

[0101] like Figure 1 As shown, one end of the abrasive flow regulating device 5 is connected to the output end of the abrasive pipeline 45; the other end is connected to the abrasive waterjet cutting terminal 8. The control methods of the abrasive flow regulating device 5 include, but are not limited to, one or more of manual adjustment, computer remote control adjustment, etc.

[0102] like Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown, the abrasive mixing device 2 includes a mixing tooth 21 and a bolt 22. The mixing tooth 21 is fixed to the outer wall of the central tube shaft 3 by the bolt 22. The abrasive mixing device 2 can be used to mix mixed abrasives (multiple types, multiple particle sizes, etc.) located inside the sand supply bin 1; the abrasive mixing device 2 can also be used to mix a single abrasive.

[0103] The abrasive flow rate regulating device can be controlled manually or automatically.

[0104] As an alternative implementation, the abrasive stirring device includes a stirring mechanism and a connecting member, wherein the stirring mechanism is detachably mounted on the central tube shaft via the connecting member. The stirring mechanism includes a plurality of stirring blades / teeth.

[0105] It should be noted that the abrasive mixing device 2 can be quickly installed and disassembled according to the user's actual needs. The mixing teeth 21 can also be replaced with blades or other mechanisms with mixing functions, and the connection method can be changed to welding or other methods.

[0106] In some embodiments, such as Figure 1 , Figure 10 and Figure 11As shown, the high-pressure water conveying device and the high-pressure air conveying device are installed inside the central tube shaft through a limiting fit, wherein:

[0107] The high-pressure water delivery device mainly consists of a still water chamber 61 and a distribution water chamber 62, which are connected by a sliding seal 63. The distribution water chamber 62 is stationary relative to the central tube shaft 3 but rotates with it, while the still water chamber 61 is stationary relative to the still sand chamber 11 and does not rotate with the central tube shaft 3. An inlet 611 is installed on the still water chamber 61 to supply high-pressure water into it; an outlet pipe 621 is installed on the distribution water chamber 62 to output high-pressure water to the abrasive waterjet cutting terminal.

[0108] The high-pressure gas delivery device mainly consists of a static air chamber 71 and a gas distribution chamber 72, which are connected by a sliding seal 73. The gas distribution chamber 72 is stationary relative to the central tube shaft 3 but rotates with it, while the static air chamber 71 is stationary relative to the static sand chamber 11 and does not rotate with the central tube shaft 3. An air inlet pipe 711 is installed on the static air chamber 71 to supply high-pressure gas into it; an air outlet pipe 721 is installed on the gas distribution chamber 72 to output high-pressure water to the abrasive waterjet cutting terminal.

[0109] The central tube shaft 3 is provided with a side hole 31, which is used to provide windows for the water outlet pipe 621 and the air outlet pipe 721 to extend from the inside of the central tube shaft 3 to the abrasive waterjet cutting terminal 8.

[0110] In some other embodiments, the abrasive waterjet system is mounted on the tunneling machine, and the central tube shaft 3 can also provide installation or transmission space for control devices / lines, etc.

[0111] In one or more embodiments, the abrasive mixing device includes a mixing mechanism and a quick-release assembly. The mixing mechanism is installed on the central tube shaft via the quick-release assembly. The abrasive mixing device can be used to mix mixed abrasives (multiple types, multiple particle sizes, etc.) located inside the sand supply chamber. The abrasive mixing device can also be used to mix a single abrasive. Of course, the abrasive mixing device can be quickly installed and disassembled according to the user's actual needs.

[0112] It should be noted that, in addition to being applicable to engineering tunneling machines, this invention can also be applied to related experimental equipment.

[0113] This embodiment provides a solution to the problem of sand blockage caused by "backflow," and offers a sand blockage treatment method based on the central rotary mechanism of a water jet tunneling machine as described above. The specific process is as follows:

[0114] Step 1: The cutter head stops rotating and advancing, and the external supply of abrasive to the abrasive bin is stopped;

[0115] Step 2: Empty the remaining abrasive material from the abrasive supply chamber;

[0116] Step 3: Seal the feed inlet and the air outlet;

[0117] Step 4: Turn on the abrasive flow rate regulating device corresponding to the abrasive waterjet cutting terminal where sand blockage has occurred, and turn off all other abrasive flow rate regulating devices.

[0118] Step 5: High-pressure gas is introduced into the sand supply chamber through the air inlet due to the external high-pressure gas source;

[0119] Step 6: Sand blockage clearing complete.

[0120] This invention overcomes the problem of uneven abrasive waterjet cutting results caused by unstable abrasive suction due to the large installation radius of the abrasive waterjet cutting terminal caused by the rotation of the cutter head. Furthermore, the invention solves the problem of abrasive segregation during the dynamic-static separation process by using an abrasive stirring device, promoting abrasive flow and ensuring the effective performance of the abrasive waterjet cutting. Finally, this invention provides a fast and effective method for clearing sand blockage, saving time lost due to equipment maintenance and indirectly improving the efficiency of abrasive waterjet cutting, thus providing a better user experience.

[0121] 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 central slewing mechanism for a waterjet tunneling machine, characterized in that, include: Abrasive supply bin, central tube shaft, abrasive conveying device, abrasive flow regulating device, abrasive mixing device, high-pressure water conveying device, and high-pressure air conveying device; One end of the central tube shaft axially passes through the sand supply bin and is coaxial with the sand supply bin, while the other end is fixedly connected to the center of the tunneling machine cutterhead and rotates around the axis of the central tube shaft with the rotating cutterhead. The input end of the abrasive conveying device is connected to the sand supply bin, and the output end is connected to the abrasive waterjet cutting terminal; the abrasive flow rate regulating device is installed on the abrasive conveying device and is used to regulate the abrasive flow rate supplied by the abrasive conveying device to the abrasive waterjet cutting terminal; the abrasive stirring device is installed on the central tube shaft located inside the sand supply bin and is used to stir and mix the abrasive inside the sand supply bin. The high-pressure water delivery device is installed inside the central tube shaft and is used to output high-pressure water to the abrasive waterjet cutting terminal; the high-pressure air delivery device is installed inside the central tube shaft and is used to output high-pressure air to the abrasive waterjet cutting terminal.

2. The center rotation mechanism of the water jet tunneling machine as described in claim 1, characterized in that, The sand supply bin includes: a static sand bin, an air outlet pipe, and a rotating baffle. The bottom of the static sand bin is provided with a bottom plate through hole, and the central tube shaft passes through the bottom plate through hole and is slidably connected to the static sand bin; The air outlet pipe is installed on the static sand chamber, with one end extending into the interior of the static sand chamber and the inner end of the air outlet pipe located at the horizontal line corresponding to the maximum volume of the abrasive in the static sand chamber; the other end of the air outlet pipe is placed outside the static sand chamber. The rotating partition is fixedly connected to the central tube shaft, rotates with the central tube shaft, and is slidably and sealingly connected to the static sand chamber.

3. The central slewing mechanism of the waterjet tunneling machine as described in claim 2, characterized in that, The static sand chamber is fixedly connected to the outside and does not rotate with the central tube shaft.

4. The center rotation mechanism of the water jet tunneling machine as described in claim 2, characterized in that, The static sand bin is equipped with a feed inlet, which is sealed to an external abrasive supply device pipeline for adding abrasive from the outside into the sand bin.

5. The central slewing mechanism of the waterjet tunneling machine as described in claim 2, characterized in that, The sand silo is equipped with an air inlet. When cleaning up sand blockage, high-pressure gas is introduced into the sand silo from an external high-pressure gas source through the air inlet.

6. The center rotation mechanism of the waterjet tunneling machine as described in claim 2, characterized in that, The abrasive conveying device includes: bearings, gears, spiral blades, and abrasive pipelines; The bearing is installed in the through hole of the partition plate, and the through hole of the partition plate is set on the rotating partition plate; the outer ring of the bearing is fixedly connected to the inner wall of the through hole of the partition plate; The gear teeth mesh with the gear ring, which is mounted on the static sand chamber; the gear shaft is fixedly connected to the inner ring of the bearing, and the gear shaft is provided with a gear shaft through hole. One end of the spiral blade passes through the inner ring of the bearing and is fixedly connected to the through hole of the gear shaft; the other end is located inside the static sand chamber and is in a free state. The abrasive pipeline input end is slidably connected to the outer edge of the gear shaft through hole on the outside of the gear shaft, and the axes of the two coincide; the abrasive pipeline output end is connected to the abrasive flow regulating device.

7. The central slewing mechanism of the waterjet tunneling machine as described in claim 6, characterized in that, The internal space of the abrasive pipeline is filled with abrasive, and the abrasive flow regulating device is set right next to the abrasive waterjet cutting terminal.

8. The center rotation mechanism of the waterjet tunneling machine as described in claim 6, characterized in that, The outer edge of the through hole on the inner side of the rotating partition is fixedly connected to the spiral blade cover.

9. The center rotation mechanism of the waterjet tunneling machine as described in claim 6, characterized in that, The abrasive flow rate regulating device can be controlled manually or automatically.

10. The center rotation mechanism of the waterjet tunneling machine as described in claim 6, characterized in that, The abrasive stirring device includes a stirring mechanism and a connecting component. The stirring mechanism is detachably mounted on the central tube shaft via the connecting component.

11. The center rotation mechanism of the water jet tunneling machine as described in claim 1 or 2, characterized in that, The high-pressure water conveying device includes: a still water tank, a water distribution tank, and a water outlet pipe; The still water chamber is located outside the central tube shaft and is stationary, not rotating with the central tube shaft; the still water chamber is also provided with a water inlet for supplying high-pressure water into the still water chamber; The water distribution chamber is located inside the central tube shaft, is stationary relative to the central tube shaft, and is connected to the still water chamber by a sliding seal. The water outlet pipe is installed on the water distribution chamber and is used to output high-pressure water to the abrasive waterjet cutting terminal.

12. The center rotation mechanism of the waterjet tunneling machine as described in claim 11, characterized in that, The central tube shaft is provided with a side hole for providing a window for the water outlet pipe to extend from the inside of the central tube shaft to the abrasive waterjet cutting terminal.

13. The center rotation mechanism of the waterjet tunneling machine as described in claim 4, characterized in that, The high-pressure gas delivery device includes: a static gas chamber, a gas distribution chamber, and a gas outlet pipe; The static air chamber is located outside the central tube shaft and is in a stationary state, not rotating with the central tube shaft; the static air chamber is also provided with an air inlet for supplying high-pressure gas into the static air chamber; The gas distribution chamber is located inside the central tube shaft, is stationary relative to the central tube shaft, and is connected to the static gas chamber by a sliding seal. The air outlet pipe is installed on the air distribution chamber and is used to output high-pressure air to the abrasive waterjet cutting terminal.

14. The center rotation mechanism of the waterjet tunneling machine as described in claim 13, characterized in that, The central tube shaft is provided with a side hole for providing a window for the air outlet pipe to extend from the inside of the central tube shaft to the abrasive waterjet cutting terminal.

15. A method for treating sand blockage in the central rotary mechanism of a waterjet tunneling machine as described in claim 14, characterized in that, include: Control the cutter head to stop rotating and advancing, and stop the external supply of abrasive to the sand supply chamber; Empty the remaining abrasive from the abrasive supply bin; Block the feed inlet and the air outlet; Open the abrasive flow rate regulating device corresponding to the abrasive waterjet cutting terminal where sand blockage has occurred, and close all other abrasive flow rate regulating devices. High-pressure gas is introduced into the sand supply bin through the air inlet; Clearing the sand blockage is complete.

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