Variable cross-section size tunneling device of bent shield tunneling machine

Abstract

The invention discloses a variable cross-section size tunneling device of a bent shield tunneling machine, which belongs to the technical field of tunneling devices, and comprises a cutterhead, two fulcrum shafts are fixedly connected to the front end of the cutterhead, guide cylinders are rotatably connected to the fulcrum shafts, the axes of the guide cylinders are perpendicular to the axes of the fulcrum shafts, and a swing assembly for driving the two guide cylinders to rotate is arranged on the cutterhead. A support arm is slidably connected in the guide cylinder, and the front end of the support arm extends out of the guide cylinder and is provided with a rotary cutter assembly; a first sleeve is rotationally connected to the top of the guide cylinder, a first rotating shaft is rotationally connected into the first sleeve, and a first transmission assembly is arranged between the first rotating shaft and the supporting arm; a second rotating shaft is arranged between the two first sleeves, a second transmission assembly is arranged between the end of the second rotating shaft and the first rotating shaft, and a driving assembly used for driving the second rotating shaft to rotate is arranged on the cutter head. Tunneling of tunnels with various section sizes can be completed without replacing shield tunneling machines with different sizes, the adaptability and flexibility of the shield tunneling machines are improved, the construction cost is reduced, and the construction time is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel boring devices, and particularly to a variable cross-section tunneling device for a curved shield machine. Background Art

[0002] A shield machine is a tunnel boring machine using the shield method. The tunneling of the shield machine mainly relies on the continuous rotation of the cutting disc at its front end to break and "eat" rocks or soil, and then the muck is discharged through a conveyor belt. However, the cutting disc of the shield machine has a fixed diameter, so a single shield machine device alone cannot complete the tunneling operation of tunnels with different cross-section sizes.

[0003] Therefore, a variable cross-section tunneling device for a curved shield machine is proposed. Summary of the Invention

[0004] The object of the present invention is to provide a variable cross-section tunneling device for a curved shield machine, aiming to solve or improve at least one of the above technical problems.

[0005] To achieve the above object, the present invention provides the following solution: The present invention provides a variable cross-section tunneling device for a curved shield machine, including a cutter head, the cutter head is used to be arranged at the front end of the shield machine, the shield machine drives the cutter head to rotate, two support shafts are fixedly connected to the front end of the cutter head, a guiding cylinder is rotatably connected to the support shafts, the axis of the guiding cylinder is perpendicular to the axis of the support shafts, there is an included angle between the two guiding cylinders, a swinging assembly for driving the two guiding cylinders to rotate is arranged on the cutter head, a support arm is slidably connected in the guiding cylinder, and the front end of the support arm extends out of the guiding cylinder and is provided with a rotary cutting tool assembly;

[0006] A first sleeve is rotatably connected to the top of the guiding cylinder, a first rotating shaft is rotatably connected in the first sleeve, the axis of the first rotating shaft coincides with the axis of the support shaft, and a first transmission assembly is arranged between the first rotating shaft and the support arm; a second rotating shaft is arranged between the two first sleeves, a second transmission assembly is arranged between the end of the second rotating shaft and the first rotating shaft, and a driving assembly for driving the second rotating shaft to rotate is arranged on the cutter head. The driving assembly drives the second rotating shaft to rotate, thereby driving the two first rotating shafts to rotate, and further driving the two support arms to linearly slide synchronously.

[0007] Preferably, the first transmission assembly includes a gear fixedly connected to the bottom of the first rotating shaft, a rack is fixedly connected to one end of the support arm located in the guiding cylinder, the gear meshes with the rack, and the two gears are located between the two racks.

[0008] Preferably, the second transmission assembly includes a first bevel gear fixedly connected to the top of the first rotating shaft. The end of the second rotating shaft extends into the first sleeve and is fixedly connected with a second bevel gear. The first bevel gear meshes with the second bevel gear, and the second rotating shaft is rotatably connected to the side wall of the first sleeve.

[0009] Preferably, the driving assembly includes a driving motor fixedly connected to the cutter head. A housing is rotatably sleeved outside the second rotating shaft, and the housing is fixedly connected to the cutter head. A third bevel gear is fixedly sleeved on the side wall of the second rotating shaft located inside the housing. The output shaft of the driving motor extends into the housing and is fixedly connected with a fourth bevel gear. The third bevel gear meshes with the fourth bevel gear, and the output shaft of the driving motor is rotatably connected to the side wall of the housing.

[0010] Preferably, the second rotating shaft includes an outer sleeve. Two connecting shafts are slidably connected inside the outer sleeve. The opposite ends of the two connecting shafts respectively extend outside the outer sleeve and are fixedly connected with the second bevel gear. The connecting shafts are rotatably connected to the side wall of the first sleeve. The outer sleeve is rotatably connected to the housing. A plurality of limiting grooves are formed on the inner wall of the outer sleeve, and a plurality of limiting strips are fixedly connected to the outer wall of the connecting shafts. The plurality of limiting grooves and the plurality of limiting strips are arranged in one-to-one correspondence and are slidably connected.

[0011] Preferably, the swinging assembly includes a hydraulic cylinder fixedly connected to the cutter head. The hydraulic cylinder is located in the middle of the two support shafts. A connecting column is fixedly connected to the piston rod of the hydraulic cylinder. Connecting ears are respectively fixedly connected to the opposite side walls of the two guiding cylinders. A connecting rod is rotatably connected between the connecting ear and the connecting column. The connecting ear is located between the cutter head and the support shaft.

[0012] Preferably, the rotary cutting tool assembly includes a rotating motor fixedly connected to the front end of the support arm. A cutting tool is fixedly connected to the output shaft of the rotating motor.

[0013] Preferably, a rotating shaft is fixedly connected to the bottom of the guiding cylinder. The rotating shaft is rotatably connected to the support shaft. An encoder is fixedly connected to the rotating shaft. The encoder transmits information to the controller, and the controller controls the stroke of the hydraulic cylinder.

[0014] Preferably, a displacement sensor is fixedly connected to the inner wall of the guiding cylinder. The displacement sensor is used to detect the position change of the support arm and transmit the information to the controller, and the controller controls the rotation of the driving motor.

[0015] Preferably, an internal spline sleeve is fixedly connected to the output shaft of the driving motor. An external spline shaft is slidably connected inside the internal spline sleeve. The end of the external spline shaft is fixedly connected with the fourth bevel gear. The external spline shaft is rotatably connected to the side wall of the housing.

[0016] The present invention discloses the following technical effects: When tunnels with different cross-sectional sizes need to be excavated, the original cutter head of the shield machine is removed, and the cutter head of the present invention is installed on the shield machine to replace the original cutter head. The angle between the two guide cylinders is adjusted through the swing assembly, and the two arms are driven to move synchronously and linearly through the drive assembly, thereby changing the horizontal distance between the two rotary cutter assemblies. Therefore, when the shield machine drives the cutter head to rotate, the rotary cutter assembly can precisely cut the tunnel wall, thereby cutting out a tunnel with a corresponding cross-sectional size. With the present invention, it is possible to complete the tunneling tasks of tunnels with various cross-sectional sizes without replacing shield machines of different sizes. This design not only greatly improves the adaptability and flexibility of the shield machine, but also significantly reduces the construction cost and time, providing a more efficient, flexible and economical solution for tunnel excavation projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of this application are used to provide a further understanding of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation to this application. In the drawings:

[0018] Figure 1 is a schematic structural diagram of the present invention;

[0019] Figure 2 is a top view of the present invention;

[0020] Figure 3 is a schematic internal structure diagram of the guide cylinder in the present invention;

[0021] Figure 4 is an exploded view of the drive assembly in the present invention;

[0022] Figure 5 is a schematic structural diagram of the swing assembly in the present invention;

[0023] Figure 6 is a schematic structural diagram of the articulated part of the shield machine in the present invention;

[0024] Figure 7 is a schematic working diagram of the buffer area of the segment erector of the shield machine in the present invention;

[0025] Figure 8 is a schematic operation diagram when the shield machine changes the cross-section in the present invention.

[0026] In the figure: 1. Cutter head; 2. Support shaft; 3. Guide cylinder; 4. Support arm; 5. First sleeve; 6. First rotating shaft; 7. Second rotating shaft; 8. Gear; 9. Rack; 10. First bevel gear; 11. Second bevel gear; 12. Driving motor; 13. Housing; 14. Third bevel gear; 15. Fourth bevel gear; 16. Outer sleeve; 17. Connecting shaft; 18. Limit strip; 19. Hydraulic cylinder; 20. Connecting column; 21. Connecting ear; 22. Tool; 23. Connecting rod; 24. Internal spline sleeve; 25. External spline shaft; 26. Front end of shield; 27. Rear end of shield; 28. Front end spherical hinge; 29. Rear end spherical hinge; 30. Waterstop rubber curtain board. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] Referring to Figures 1 - 8 , the present invention provides a variable cross-section size tunneling device for a bending shield machine, including a cutter head 1, the cutter head 1 is used to be arranged at the front end of the shield machine, the shield machine drives the cutter head 1 to rotate, two support shafts 2 are fixedly connected to the front end of the cutter head 1, a guide cylinder 3 is rotatably connected to the support shaft 2, the axis of the guide cylinder 3 is perpendicular to the axis of the support shaft 2, there is an included angle between the two guide cylinders 3, and a swing assembly for driving the two guide cylinders 3 to rotate is arranged on the cutter head 1. A support arm 4 is slidably connected in the guide cylinder 3, and the front end of the support arm 4 extends out of the guide cylinder 3 and is provided with a rotary cutter assembly;

[0030] The top of the guide cylinder 3 is rotatably connected with a first sleeve 5, a first rotating shaft 6 is rotatably connected in the first sleeve 5, the axis of the first rotating shaft 6 coincides with the axis of the support shaft 2, and a first transmission assembly is arranged between the first rotating shaft 6 and the support arm 4; A second rotating shaft 7 is arranged between the two first sleeves 5, and a second transmission assembly is arranged between the end of the second rotating shaft 7 and the first rotating shaft 6. A driving assembly for driving the second rotating shaft 7 to rotate is arranged on the cutter head 1. The driving assembly drives the second rotating shaft 7 to rotate, thereby driving the two first rotating shafts 6 to rotate, and further driving the two support arms 4 to slide linearly synchronously.

[0031] The axis of the first rotating shaft 6 coincides with the axis of the first sleeve 5.

[0032] When tunnels of different cross-sectional sizes need to be excavated, the original cutter head of the shield machine is removed, and the cutter head of the present invention is installed on the shield machine to replace the original cutter head. The angle between the two guiding cylinders 3 is adjusted by the swinging assembly, and the two arms 4 are driven to move linearly synchronously by the driving assembly, so as to change the horizontal distance between the two rotary cutter assemblies. Therefore, when the shield machine drives the cutter head 1 to rotate, the rotary cutter assemblies can precisely cut the tunnel wall, thereby cutting out a tunnel with a corresponding cross-sectional size. With the present invention, the tunneling tasks of tunnels with various cross-sectional sizes can be completed without replacing shield machines of different sizes. This design not only greatly improves the adaptability and flexibility of the shield machine, but also significantly reduces the construction cost and time, providing a more efficient, flexible and economical solution for tunnel excavation projects.

[0033] In some alternative embodiments, the first transmission assembly includes a gear 8 fixedly connected to the bottom of the first rotating shaft 6. One end of the arm 4 located inside the guiding cylinder 3 is fixedly connected with a rack 9. The gear 8 meshes with the rack 9, and the two gears 8 are located between the two racks 9.

[0034] When the extended length of the arm 4 needs to be changed, the first rotating shaft 6 is driven to rotate by the driving assembly. The rotation of the first rotating shaft 6 drives the gear 8 to rotate, thereby driving the rack 9 to move linearly back and forth inside the guiding cylinder 3, and further driving the arm 4 to move back and forth to change the extended length of the arm 4. The two arms 4 are arranged in a V shape. When the extended length of the arm 4 is longer, the distance between the two rotary cutter assemblies is larger. When the rotary cutter assemblies driven by the cutter head 1 rotate, a tunnel with a larger cross-sectional size can be cut;

[0035] When the extended length of the arm 4 remains unchanged, the distance between the rotary cutter assemblies can also be adjusted by adjusting the angle between the two guiding cylinders 3. When the angle between the two guiding cylinders 3 needs to be adjusted, the guiding cylinder 3 is driven to rotate around the support shaft 2 by the swinging assembly. Since the axis of the first rotating shaft 6 coincides with the axis of the support shaft 2, during the rotation of the guiding cylinder 3, the rack 9 and the gear 8 are always kept in a meshing state.

[0036] In some alternative embodiments, the second transmission assembly includes a first bevel gear 10 fixedly connected to the top of the first rotating shaft 6. The end of the second rotating shaft 7 extends into the first sleeve 5 and is fixedly connected with a second bevel gear 11. The first bevel gear 10 meshes with the second bevel gear 11, and the second rotating shaft 7 is rotatably connected to the side wall of the first sleeve 5.

[0037] In some alternative embodiments, the driving assembly includes a driving motor 12 fixedly connected to the cutter head 1. A housing 13 is rotatably sleeved outside the second rotating shaft 7, and the housing 13 is fixedly connected to the cutter head 1. A third bevel gear 14 is fixedly sleeved on the side wall of the second rotating shaft 7 located inside the housing 13. The output shaft of the driving motor 12 extends into the housing 13 and is fixedly connected with a fourth bevel gear 15. The third bevel gear 14 meshes with the fourth bevel gear 15, and the output shaft of the driving motor 12 is rotatably connected to the side wall of the housing 13.

[0038] When it is necessary to adjust the extending length of the support arm 4, the driving motor 12 drives the fourth bevel gear 15 to rotate. The rotation of the fourth bevel gear 15 drives the third bevel gear 14 to rotate, so that the second bevel gears 11 at both ends rotate, and then drives the two first bevel gears 10 to rotate synchronously and in opposite directions. The first bevel gear 10 drives the gear 8 to rotate, and the gear 8 drives the rack 9 to move back and forth, so as to realize the telescoping of the support arm 4. Since the two first bevel gears 10 rotate in opposite directions, the two gears 8 rotate in opposite directions, and the two gears 8 are located between the two racks 9. Therefore, the two racks 9 move synchronously and in the same direction, realizing the synchronous telescoping of the two support arms 4.

[0039] In some alternative embodiments, the second rotating shaft 7 includes an outer sleeve 16. Two connecting shafts 17 are slidably connected inside the outer sleeve 16. The opposite ends of the two connecting shafts 17 respectively extend outside the outer sleeve 16 and are fixedly connected with the second bevel gears 11. The connecting shafts 17 are rotatably connected to the side wall of the first sleeve 5, and the outer sleeve 16 is rotatably connected to the housing 13. A plurality of limiting grooves are formed on the inner wall of the outer sleeve 16, and a plurality of limiting strips 18 are fixedly connected to the outer wall of the connecting shafts 17. The plurality of limiting grooves and the plurality of limiting strips 18 are arranged in one-to-one correspondence and are slidably connected.

[0040] When the outer sleeve 16 rotates, it drives the two connecting shafts 17 to rotate synchronously. By providing the outer sleeve 16 and the two connecting shafts 17, it is convenient for the installation, maintenance and replacement of the second bevel gear 11.

[0041] Furthermore, an internal spline sleeve 24 is fixedly connected to the output shaft of the driving motor 12. An external spline shaft 25 is slidably connected inside the internal spline sleeve 24. The end of the external spline shaft 25 is fixedly connected with the fourth bevel gear 15, and the external spline shaft 25 is rotatably connected to the side wall of the housing 13.

[0042] By providing the external spline shaft 25 and the internal spline sleeve 24, it is convenient to realize the connection between the fourth bevel gear 15 and the driving motor 12, and at the same time it is convenient to disassemble for maintenance and replacement.

[0043] In some alternative embodiments, the swing assembly includes a hydraulic cylinder 19 fixedly connected to the cutter head 1. The hydraulic cylinder 19 is located in the middle of the two support shafts 2. A connecting column 20 is fixedly connected to the piston rod of the hydraulic cylinder 19. Connecting ears 21 are respectively fixedly connected to the opposite side walls of the two guide cylinders 3. A connecting rod 23 is rotatably connected between the connecting ear 21 and the connecting column 20. The connecting ear 21 is located between the cutter head 1 and the support shaft 2.

[0044] When it is necessary to change the angle between the two guide cylinders 3, the hydraulic cylinder 19 drives the two connecting rods 23 to rotate, thereby driving the two guide cylinders 3 to rotate around the two support shafts 2 respectively, and the rotation directions are opposite and the rotation angles are the same.

[0045] By adjusting the angle of the guide cylinder 3 and at the same time adjusting the extension length of the support arm 4, the adjustment of a larger cutting range is realized.

[0046] In some alternative embodiments, the rotary cutting tool assembly includes a rotating motor fixedly connected to the front end of the support arm 4, and a cutting tool 22 is fixedly connected to the output shaft of the rotating motor.

[0047] The cutting tool 22 is driven to rotate by the rotating motor, so as to precisely cut the tunnel wall.

[0048] In some alternative embodiments, a rotating shaft is fixedly connected to the bottom of the guide cylinder 3. The rotating shaft is rotatably connected to the support shaft 2. An encoder is fixedly connected to the rotating shaft. The encoder transmits information to the controller, and the controller controls the stroke of the hydraulic cylinder 19.

[0049] According to the input preset information, the controller controls the output shaft of the hydraulic cylinder 19 to extend, thereby driving the two guide cylinders 3 to rotate synchronously. The encoder obtains the rotation angle information of the guide cylinder 3 and transmits the information to the controller. The controller compares it with the preset information. When the actual rotation angle does not match the preset angle, it is fed back to the hydraulic cylinder 19 for further adjustment, thereby forming a closed-loop control to improve the accuracy of angle adjustment.

[0050] In some alternative embodiments, a displacement sensor is fixedly connected to the inner wall of the guide cylinder 3. The displacement sensor is used to detect the position change of the support arm 4 and transmit the information to the controller, and the controller controls the rotation of the drive motor 12.

[0051] According to the input preset information, the controller controls the output shaft of the drive motor 12 to rotate, thereby driving the linear displacement of the support arm 4. The displacement sensor transmits the movement information of the support arm 4 to the controller. The controller compares it with the preset information. When the actual movement distance does not match the preset distance, it is fed back to the drive motor 12 for further adjustment, thereby forming a closed-loop control to improve the accuracy of the telescopic adjustment of the support arm 4.

[0052] Specifically, when a tunnel with a smaller cross-section needs to be excavated, the boom 4 can be retracted to a shorter length, and the angle between the two guiding cylinders 3 can be adjusted to a smaller value, so that the overall cutting diameter of the cutter head is reduced to adapt to the narrow space; while when a tunnel with a larger cross-section needs to be excavated, the boom 4 can be extended accordingly, and the angle between the two guiding cylinders 3 can be adjusted to a larger value to expand the cutting range of the cutter head and ensure the one-time forming of the tunnel cross-section. At the same time, the boom 4 can also be fixed to the corresponding length. First, the two cutters 22 are made to approach each other, and cutting is performed during the rotation of the cutter head 1. Then, the distance between the two cutters 22 is gradually increased during the rotation of the cutter head 1, so as to achieve the one-time cutting of the tunnel from the middle to the side, and cut out a tunnel with the required cross-sectional size. This design not only greatly improves the adaptability and flexibility of the shield machine, but also significantly reduces the construction cost and time, because the tunneling tasks of tunnels with various cross-sectional sizes can be completed without replacing shield machines of different sizes.

[0053] In this embodiment, the shield machine includes a shield front end 26 and a shield rear end 27 that are hinged to each other, an oil cylinder, and a front end ball joint 28 and a rear end ball joint 29 for steering control. The front end ball joint 28 and the rear end ball joint 29 are provided with openings in the middle to facilitate the passage of the shield machine pipeline. The shield front end 26 and the shield rear end 27 are connected by a ball joint to form a movable hinge section. Lubricating oil is added to the gaps between the front end ball joint 28 and the rear end ball joint 29. The shield front end 26 and the shield rear end 27 automatically form an angle under the restriction of the excavated soil body, so as to realize the turning of the fuselage along a curved path. In this example, a water-stop rubber curtain board 30 is provided on the outer side of the hinge section of the turning shield machine. The inner side of the water-stop rubber curtain board 30 is closely attached to the connection parts of the front end ball joint 28 and the rear end ball joint 29. When the shield machine turns, the front end ball joint 28 and the rear end ball joint 29 deflect along with the action of the oil cylinder in the excavated area of the surrounding soil body. The water-stop rubber curtain board 30 adapts to the dynamic displacement of the hinge section through its own elastic deformation and always remains in contact with the outer periphery of the ball joint to form a continuous seal. In addition, the surface of the ball joint should be specially polished, and the contact part with the water-stop rubber curtain board 30 is smooth without welds, reducing friction loss and ensuring the durability of the seal.

[0054] A bending shield machine, which includes a shield main machine, a connecting bridge, several carriages connected in sequence, a front traction device, a rear traction device, and a bearing device connected between the connecting bridge and the adjacent carriage. The front traction device is connected between the shield main machine and the connecting bridge. When there is one carriage, there is one rear traction device and it is connected between the connecting bridge and the carriage. When there are multiple carriages, there are multiple rear traction devices and they are respectively connected between the connecting bridge and the carriage and between two adjacent carriages. The bearing device is located above the rear traction device between the connecting bridge and the carriage. The rear end of the shield main machine has an operation platform. The front traction device includes a base fixedly connected to the front end of the connecting bridge, and a traction oil cylinder connected between the base and the operation platform. The base has an extension section located above the operation platform. A spherical first protrusion is provided on the lower end surface of the extension section. A first lapping platform is provided on the upper end surface of the operation platform and below the first protrusion. The first protrusion is lapped on the first lapping platform.

[0055] During daily work, the shield turning is realized by the shield driver operating the stroke of the active hinge oil cylinder according to the deviation value and trend value displayed by the guiding system equipped on the shield machine. Generally, the designed axis of the shield tunnel is a straight line or an arc curve with a large curvature radius (approximately a straight line in a large range). The shield driver operates the shield machine to move forward around a straight line, which is equivalent to the reference standard remaining unchanged. Reflected in the stroke difference of the hinge oil cylinder, theoretically it should always be zero and remain unchanged. Therefore, the operation is relatively simple.

[0056] Based on the relevant parameters of the shield machine and the principle of turning, obtain the stroke of the shield machine hinge oil cylinder and the data parameters related to different turning radii and other equipment;

[0057] Use the calculation module to calculate the stroke of the shield machine hinge oil cylinder obtained and the data parameters related to different turning radii and other equipment to obtain the data parameters of the included angle and stroke difference of the hinge oil cylinder corresponding to the shield machine mileage;

[0058] Use the monitoring module to monitor the actual included angle and stroke difference data parameters of the shield machine hinge oil cylinder in real time and transmit them to the calculation module;

[0059] Calculate the data parameters of the included angle and stroke difference of the hinge oil cylinder corresponding to the shield machine mileage obtained by the calculation module and the actual included angle and stroke difference data parameters of the shield machine hinge oil cylinder monitored in real time by the monitoring module through the calculation module to obtain control information, and send the control information to the execution module;

[0060] When the monitoring module receives again the actual included angle and stroke difference data parameters of the shield machine hinge oil cylinder monitored in real time, transmit them to the calculation module, obtain new control information, and then send it to the execution module until the shield machine completes the entire curved tunnel;

[0061] The data parameters of the actual angle and stroke difference of the articulated cylinders of the shield machine monitored in real time by the monitoring module are calculated by the calculation module to obtain the calculation formula of the control information as follows:

[0062] Let s be the buffer distance of the variable cross-section tunneling device, r1 be the radius before the change of the tunnel cross-section, and r2 be the radius after the change of the tunnel cross-section. When s approaches infinity, the triangle with sides r2 - r1 and s is approximately a right triangle. The angle that the variable cross-section tunneling device needs to expand is α, then:

[0063]

[0064] The specific working process of the buffer area of the shield machine is as follows:

[0065] (1) Place the segment (equipped with matching screws for the segment gripper) on the segment conveying trolley in the correct order; the segment matching screws need to be determined in advance according to the relevant parameters of the buffer area such as α.

[0066] (2) Start the filter cooling pump, auxiliary pump, propulsion pump, and segment erector pump on the middle shield in sequence;

[0067] (3) Switch the working mode of the shield machine to the segment installation mode;

[0068] (4) Retract the propulsion cylinders in the first segment installation area;

[0069] (5) The conveying trolley transports the first segment to below the erector;

[0070] (6) After the segment erector grabs the segment, accurately position it to the final position by adjusting the large cylinder, rotary motor, and flipping of the gripper head, etc.;

[0071] (7) Insert bolts into the holes that need to install bolts and put on nuts, but do not tighten them temporarily;

[0072] (8) Extend the corresponding propulsion cylinders and press against the segments that have reached the position. It must be ensured that at least two (pairs) of cylinders symmetrically press against the segments for each of the A, B, and C segments;

[0073] (9) Tighten the bolts with a pneumatic wrench, and the air pressure of the pneumatic wrench should meet the specified torque requirements;

[0074] (10) Loosen the gripper head and proceed with the installation of the next segment;

[0075] (11) Install the remaining segments except the closing segment in sequence according to the above steps; when installing the closing segment, the closing segment should be positioned by slowly moving from the large end to the small end of the trapezoidal head;

[0076] After the segment is installed, the gripper head of the segment erector shall be placed upward, and the shield machine shall be switched to the tunneling mode.

[0077] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0078] The above-described embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A variable cross-section tunneling device for a bending shield machine, characterized in that: It includes a cutter head (1) which is used to be arranged at the front end of a shield machine. The shield machine drives the cutter head (1) to rotate. Two support shafts (2) are fixedly connected to the front end of the cutter head (1). A guiding cylinder (3) is rotatably connected to the support shafts (2). The axis of the guiding cylinder (3) is perpendicular to the axis of the support shafts (2). There is an included angle between the two guiding cylinders (3). A swinging assembly for driving the two guiding cylinders (3) to rotate is arranged on the cutter head (1). A support arm (4) is slidably connected in the guiding cylinder (3). The front end of the support arm (4) extends out of the guiding cylinder (3) and is provided with a rotary cutting tool assembly. A first sleeve (5) is rotatably connected to the top of the guiding cylinder (3). A first rotating shaft (6) is rotatably connected in the first sleeve (5). The axis of the first rotating shaft (6) coincides with the axis of the support shaft (2). A first transmission assembly is arranged between the first rotating shaft (6) and the support arm (4). A second rotating shaft (7) is arranged between the two first sleeves (5). A second transmission assembly is arranged between the end of the second rotating shaft (7) and the first rotating shaft (6). A driving assembly for driving the second rotating shaft (7) to rotate is arranged on the cutter head (1). The driving assembly drives the second rotating shaft (7) to rotate, thereby driving the two first rotating shafts (6) to rotate, and further driving the two support arms (4) to slide linearly synchronously.

2. The variable cross-section size tunneling device of the bending shield machine according to claim 1, characterized in that: The first transmission assembly includes a gear (8) fixedly connected to the bottom of the first rotating shaft (6). A rack (9) is fixedly connected to one end of the support arm (4) located in the guiding cylinder (3). The gear (8) meshes with the rack (9). The two gears (8) are located between the two racks (9).

3. The variable cross-section tunneling device of the bending shield machine according to claim 2, characterized in that: The second transmission assembly includes a first bevel gear (10) fixedly connected to the top of the first rotating shaft (6). The end of the second rotating shaft (7) extends into the first sleeve (5) and is fixedly connected with a second bevel gear (11). The first bevel gear (10) meshes with the second bevel gear (11). The second rotating shaft (7) is rotatably connected to the side wall of the first sleeve (5).

4. The variable cross-section tunneling device of the curved shield machine according to claim 3, characterized in that: The driving assembly includes a driving motor (12) fixedly connected to the cutter head (1). A housing (13) is rotatably sleeved outside the second rotating shaft (7). The housing (13) is fixedly connected to the cutter head (1). A third bevel gear (14) is fixedly sleeved on the side wall of the second rotating shaft (7) located in the housing (13). The output shaft of the driving motor (12) extends into the housing (13) and is fixedly connected with a fourth bevel gear (15). The third bevel gear (14) meshes with the fourth bevel gear (15). The output shaft of the driving motor (12) is rotatably connected to the side wall of the housing (13).

5. The variable cross-section tunneling device of a curved shield machine according to claim 4, characterized in that: The second rotating shaft (7) includes an outer sleeve (16). Two connecting shafts (17) are slidably connected inside the outer sleeve (16). One end of each of the two connecting shafts (17) facing away from each other extends outside the outer sleeve (16) and is fixedly connected to the second bevel gear (11). The connecting shaft (17) is rotatably connected to the side wall of the first sleeve (5). The outer sleeve (16) is rotatably connected to the housing (13). A plurality of limiting grooves are formed on the inner wall of the outer sleeve (16). A plurality of limiting strips (18) are fixedly connected to the outer wall of the connecting shaft (17). The plurality of limiting grooves and the plurality of limiting strips (18) are arranged in one-to-one correspondence and are slidably connected.

6. The variable cross-section size tunneling device of the bending shield machine according to claim 1, characterized in that: The swinging assembly includes a hydraulic cylinder (19) fixedly connected to the cutter head (1). The hydraulic cylinder (19) is located in the middle of the two support shafts (2). A connecting column (20) is fixedly connected to the piston rod of the hydraulic cylinder (19). Connecting ears (21) are respectively fixedly connected to the opposite side walls of the two guide cylinders (3). A connecting rod (23) is rotatably connected between the connecting ear (21) and the connecting column (20). The connecting ear (21) is located between the cutter head (1) and the support shaft (2).

7. The variable cross-section tunneling device of the bending shield machine according to claim 1, characterized in that: The rotary cutting tool assembly includes a rotating motor fixedly connected to the front end of the support arm (4). A cutting tool (22) is fixedly connected to the output shaft of the rotating motor.

8. The variable cross-section size tunneling device of the curved shield machine according to claim 6, characterized in that: A rotating shaft is fixedly connected to the bottom of the guide cylinder (3). The rotating shaft is rotatably connected to the support shaft (2). An encoder is fixedly connected to the rotating shaft. The encoder transmits information to the controller, and the controller controls the stroke of the hydraulic cylinder (19).

9. The variable cross-section tunneling device of the bending shield machine according to claim 4, characterized in that: A displacement sensor is fixedly connected to the inner wall of the guide cylinder (3). The displacement sensor is used to detect the position change of the support arm (4) and transmit the information to the controller, and the controller controls the rotation of the drive motor (12).

10. The variable cross-section tunneling device of the bending shield machine according to claim 4, characterized in that: An internal spline sleeve (24) is fixedly connected to the output shaft of the drive motor (12). An external spline shaft (25) is slidably connected inside the internal spline sleeve (24). The end of the external spline shaft (25) is fixedly connected to the fourth bevel gear (15). The external spline shaft (25) is rotatably connected to the side wall of the housing (13).

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