Rectangular vertical shaft heading machine

Abstract

The invention provides a rectangular vertical shaft heading machine, and belongs to the technical field of tunnel engineering construction. Comprising a shield body, a first gripper shoe device, a second gripper shoe device, a rotation device and an excavation device, the rotating device is connected with the shield body and the excavation device and is used for driving the excavation device to rotate; the excavation device is used for excavating a soil layer. By arranging the first supporting shoe device and the second supporting shoe device which are arranged on the different end faces of the shield body respectively, when the rectangular vertical shaft heading machine conducts heading, the first supporting shoe device and the second supporting shoe device can be attached to the tunnel wall at the same time, so that enough supporting force is provided for the rectangular vertical shaft heading machine, and the rectangular vertical shaft heading machine is prevented from sinking due to gravity; and meanwhile, the rotary device is arranged to drive the excavation device to do 360-degree rotary motion, so that excavation of different positions of the rectangular hole wall is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel engineering construction and relates to a rectangular shaft boring machine. Background Art

[0002] With the acceleration of urbanization and the requirements of some engineering projects, the demand for vertical shafts is increasing. At present, the excavation of vertical shafts mainly adopts the drilling and blasting method, which faces many problems in terms of environment, safety, construction period, etc., and mechanically excavated vertical shafts are mostly circular. However, in the fields of anti-slip piles, underground garages, and other underground spaces, rectangular vertical shafts have higher space utilization than circular vertical shafts. The bending section coefficient of the rectangular section of the same area is larger than that of the circular section. Rectangular vertical shafts have a wider range of applications than circular vertical shafts. However, the existing circular shaft boring equipment is not suitable for the excavation of rectangular sections. How to provide a vertical shaft boring machine with a high degree of mechanization, safe operation, and low environmental impact is a problem that needs to be solved urgently by technical personnel in this field.

[0003] In order to solve the above technical problems, technical personnel in this field have proposed solutions. Patent Publication No. CN114033385A "Shaft Boring Machine and Shaft Boring Method" proposes a shaft boring machine and a shaft boring method. In order to solve the technical problem that the excavation of a large cross-section shaft is difficult, the invention provides a shaft boring machine, including a frame, an excavation unit, a support mechanism and a walking system. The excavation unit is installed on the walking system, and the walking system is installed on the frame. The walking system can drive the excavation unit to move horizontally to excavate the shaft. The support mechanism is connected to the frame to support the frame and provide excavation reaction force. The shaft boring machine has a complex structure. The whole machine has multiple excavation systems, which can easily cause interference between the excavation systems during the construction process. The entire outer frame cannot move longitudinally and transversely, and it is easy to cause excavation blind spots when excavating the four corners of the rectangle, thereby affecting the working efficiency of the shaft boring machine. Summary of the invention

[0004] The present invention provides a rectangular shaft boring machine, comprising a shield body, and a first gripper device, a second gripper device, a rotating device and an excavating device arranged on the shield body;

[0005] The first gripper device comprises a first gripper, the first gripper is connected to the shield body through a first driving member, and the first gripper is driven by the first driving member to move in a direction close to or away from the shield body;

[0006] The second gripper device comprises a second gripper, the second gripper is connected to the shield body through a third driving member, and the second gripper is driven by the third driving member to move in a direction close to or away from the shield body;

[0007] The slewing device is connected to the shield body and the excavation device, and is used to drive the excavation device to perform slewing motion;

[0008] The excavation device comprises a cutter disc for excavating the soil layer.

[0009] Optionally, the first shoe device further comprises a second driving member which is arranged obliquely, wherein the driving end of the second driving member is hinged to the fixed end of the first driving member, and the fixed end of the second driving member is hinged to the shield body, and is used to drive the first driving member to extend or retract at an angle of 30°-60° relative to the shield body;

[0010] The second shoe device also includes a fourth driving member that is arranged obliquely, wherein the driving end of the fourth driving member is hinged to the fixed end of the second driving member, and the fixed end of the fourth driving member is hinged to the shield body, and is used to drive the second driving member to extend or retract at an angle of 30°-60° relative to the shield body.

[0011] Optionally, a first ball head hinge structure is further provided between the second driving member and the shield body, a first ball head seat in the first ball head hinge structure is fixedly connected to the shield body, and a first ball head in the first ball head hinge structure is fixedly connected to the driving end of the second driving member.

[0012] Optionally, the first gripper shoe device is provided with two groups symmetrically arranged along the central axis of the shield body, and a single group of the first gripper shoe device is provided with at least two pieces arranged in parallel;

[0013] The second gripper shoe device is provided with two groups symmetrically arranged along the central axis of the shield body, and a single group of the second gripper shoe device is provided with at least two pieces arranged in parallel;

[0014] The end surface of the shield body used for arranging the first shoe device and the end surface used for arranging the second shoe device are perpendicular to each other.

[0015] Optionally, the rotating device is further provided with an anti-twist component and an axial limiting hole;

[0016] The anti-twist assembly is used to limit the torque generated by the slewing device when it is working;

[0017] The axial limiting hole is provided with at least one arranged in parallel with the second support shoe device; and a limiting device is installed in each of the single axial limiting holes, and the limiting device is used to limit the axial movement of the rotating device.

[0018] Optionally, the limiting device includes a fifth driving member and a limiting block; one end of the fifth driving member is fixedly connected to the shield body, and the limiting block is installed on the other end of the fifth driving member. When the shaft boring machine is assembled, the fifth driving member in the limiting device drives the limiting block to extend into the axial limiting hole to limit the axial movement of the rotating device.

[0019] Optionally, a third support shoe device is also provided in the rotary device;

[0020] The third gripper shoe device comprises a sixth driving member and a third gripper shoe; the fixed end of the sixth driving member is fixedly connected to the rotating device, and the driving end of the sixth driving member is hinged to the third gripper shoe for driving the third gripper shoe to move in a direction close to or away from the rotating device.

[0021] Optionally, a second ball head hinge structure is provided between the sixth driving member and the third support shoe, the second ball head seat in the second ball head hinge structure is fixedly connected to the third support shoe, and the second ball head in the second ball head hinge structure is fixedly connected to the driving end of the sixth driving member.

[0022] Optionally, the excavation device also includes a telescopic arm and a swing cylinder; the telescopic arm is hinged to the driving end of the rotating device, one end of the swing cylinder is hinged to the rotating device, and the other end of the swing cylinder is hinged to the telescopic arm, and the swing cylinder is used to drive the telescopic arm to swing; the cutter disc is installed on the end of the telescopic arm away from the rotating device.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The rectangular shaft boring machine provided by the present invention is provided with a first shoe device and a second shoe device respectively arranged on different end surfaces of a shield body, so that when the rectangular shaft boring machine is excavating, the first shoe device and the second shoe device can simultaneously fit the tunnel wall, thereby providing sufficient supporting force for the rectangular shaft boring machine to prevent it from sinking due to gravity; at the same time, a rotating device is provided to drive the excavation device to perform a 360-degree rotating motion, thereby realizing excavation at different positions of the rectangular tunnel wall.

[0025] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0027] Figure 1 It is a structural schematic diagram of a rectangular shaft boring machine in an embodiment of the present invention;

[0028] Figure 2 yes Figure 1 Schematic diagram of the AA section;

[0029] Figure 3 yes Figure 1 Schematic diagram of the middle BB section;

[0030] Figure 4 Schematic diagram of a starting state of a rectangular shaft boring machine in an embodiment of the present invention;

[0031] Figure 5 is a schematic diagram of a rectangular shaft boring machine in an embodiment of the present invention when excavating a blind area;

[0032] Figure 6 yes Figure 1 A cross-sectional schematic diagram of a middle limit device;

[0033] Figure 7 yes Figure 1 Schematic diagram of the middle telescopic arm in the step-changing state;

[0034] Figure 8 yes Figure 1 Schematic diagram of the structure of the third support shoe device.

[0035] in:

[0036] 1. shield body, 11. first oil cylinder seat, 12. second oil cylinder seat, 13. third oil cylinder seat, 14. fourth oil cylinder seat;

[0037] 2. first gripper device, 21. first oil cylinder, 211. fifth oil cylinder seat, 22. second oil cylinder, 23. first gripper;

[0038] 3. second support shoe device, 31. third oil cylinder, 311. sixth oil cylinder seat, 312. first ball head, 32. fourth oil cylinder, 33. second support shoe, 331. first ball head seat, 34. first gland;

[0039] 4. Rotating device, 41. Seventh oil cylinder seat, 42. Eighth oil cylinder seat, 43. Anti-twist assembly, 44. Limiting hole;

[0040] 5. excavation device, 51. telescopic arm, 511. ninth cylinder seat, 52. swing cylinder, 53. cutterhead;

[0041] 6. Limiting device, 61. Fifth oil cylinder, 62. Limiting block;

[0042] 7. The third support shoe device, 71. The sixth oil cylinder, 711. The second ball head, 72. The second gland, 73. The third support shoe, 731. The second ball head seat. DETAILED DESCRIPTION

[0043] In order to make the above-mentioned purposes, features and advantages of the present invention more clear and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings. It should be noted that the drawings of the present invention are all simplified and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the implementation of the present invention; the "number" mentioned in the present invention is not limited to the specific number in the examples in the accompanying drawings; the directions or positional relationships indicated by "front", "middle", "back", "left", "right", "up", "down", "top", "bottom", "middle", etc. mentioned in the present invention are based on the directions or positional relationships shown in the drawings of the present invention, and do not indicate or imply that the devices or components referred to must have a specific direction, nor can they be understood as limitations on the present invention.

[0044] Example:

[0045] See also Figures 1 to 8 As shown, a rectangular shaft boring machine provided by the present invention comprises a shield body 1, a first gripper shoe device 2, a second gripper shoe device 3, a rotating device 4, an excavation device 5, a limiting device 6 and a third gripper shoe device 7.

[0046] A first oil cylinder seat 11 , a second oil cylinder seat 12 , a third oil cylinder seat 13 and a fourth oil cylinder seat 14 are provided on the shield body 1 .

[0047] The first support shoe device 2 includes a first cylinder 21, a second cylinder 22 and a first support shoe 23. The fixed end of the first cylinder 21 is connected to the shield body 1 through the first cylinder seat 11, and the first support shoe 23 is installed on the driving end of the first cylinder 21; the driving end of the second cylinder 22 is hinged to the fixed end of the first cylinder 21 through the fourth cylinder seat 211, and the fixed end of the second cylinder 22 is hinged to the shield body 1 through the second cylinder seat 12.

[0048] Preferably, the first gripper shoe device 2 is provided with two groups symmetrically arranged along the central axis of the shield body 1, and a single group of first gripper shoe devices 2 is provided with at least two pieces arranged in parallel. Specifically, two groups of first gripper shoe devices 2 spaced apart from each other are preferably provided on two mutually parallel side end surfaces of the shield body 1, and the first gripper shoe devices 2 respectively arranged on two different side end surfaces of the shield body 1 are arranged corresponding to each other.

[0049] Further preferably, the first cylinder seat 11 is provided with a one-to-one correspondence with the first cylinder 21 , and the second cylinder seat 12 is provided with a one-to-one correspondence with the second cylinder 22 .

[0050] The second support shoe device 3 includes a third oil cylinder 31, a fourth oil cylinder 32, a second support shoe 33 and a first pressure cover 34. The fixed end of the third oil cylinder 31 is connected to the shield body 1 through the second oil cylinder seat 12, and the driving end of the third oil cylinder 31 is hinged to the second support shoe 33. The driving end of the fourth oil cylinder 32 is hinged to the fixed end of the third oil cylinder 31 through the sixth oil cylinder seat 311, and the fixed end of the fourth oil cylinder 32 is hinged to the shield body 1 through the fourth oil cylinder seat 14. Specifically, a pressure cover 34 is installed on the driving end of the third oil cylinder 31, and a first ball head hinge structure is installed on the second support shoe 33. The first ball head seat 331 in the first ball head hinge structure is fixedly connected to the second support shoe 33, and the first ball head 312 in the first ball head hinge structure is fixedly connected to the pressure cover 34.

[0051] Preferably, the second shoe device 3 is provided with two groups symmetrically arranged along the central axis of the shield body 1, and a single group of the second shoe device 3 is provided with at least two pieces arranged in parallel; and the end surface of the shield body 1 used to set the first shoe device 2 and the end surface used to set the second shoe device 3 are perpendicular to each other. Specifically, two groups of second shoe devices 3 spaced apart from each other are preferably provided on two mutually parallel side end surfaces of the shield body 1, and the second shoe devices 3 respectively arranged on two different side end surfaces of the shield body 1 are arranged correspondingly to each other, and the second shoe devices 3 and the first shoe devices 2 are arranged perpendicular to each other.

[0052] The fixed end of the rotating device 4 is fixedly connected to the shield body 1, and the driving end of the rotating device 4 is provided with an excavating device 5, which is used to drive the excavating device 5 to rotate 360 ​​degrees relative to the shield body 1. Preferably, the specific structure of the rotating device 4 refers to the prior art.

[0053] Preferably, in order to increase the excavation depth each time, the rotating device 4 is also provided with an anti-torsion component 43 and an axial limiting hole 44; the anti-torsion component 43 is used to limit the torque generated by the rotating device 4 when working, and the anti-torsion component 43 is provided with a plurality of groups arranged in a circumferential array along the rotating device 4 (in this embodiment, it is preferably arranged as four groups, and the four groups of anti-torsion components 43 are not arranged on the central axis of the rotating device 4); the axial limiting hole 44 is provided with two arranged in parallel with the second support shoe device 3; and a limiting device 6 is installed in a single axial limiting hole 44, and the limiting device 6 includes The fifth oil cylinder 61 and the limit block 62, one end of the fifth oil cylinder 61 is fixedly connected to the shield body 1, and the limit block 62 is installed on the other end of the fifth oil cylinder 61. The fifth oil cylinder 61 drives the limit block 62 to move in the axial limit hole 44 in the direction close to or away from the rotating device 4. The limit block 62 and the limit plate clearance in the shield body 1 are matched to prevent the limit block 62 from shifting during the movement; when the shaft boring machine is assembled, the fifth oil cylinder 61 in the limit device 6 is extended, so that the limit block 62 extends into the axial limit hole 44 in the rotating device 4, thereby limiting the axial movement of the rotating device 4.

[0054] The excavation device 5 includes a telescopic arm 51, a swing cylinder 52 and a cutter head 53; the telescopic arm 51 is hinged to the driving end of the rotary device 4, one end of the swing cylinder 52 is hinged to the rotary device 4 through the seventh cylinder seat 41, and the other end of the swing cylinder 52 is hinged to the telescopic arm 51 through the ninth cylinder seat 511, and the swing cylinder 52 is used to drive the telescopic arm 51 to swing; the cutter head 53 is installed on the end of the telescopic arm 51 away from the rotary device 4 for excavation. It is preferred here that the structure of the cutter head 53 refers to the prior art.

[0055] When the shaft boring machine starts, all the cylinders are in the initial position. When the shaft boring machine starts to dig, the second cylinder 22 and the fourth cylinder 32 extend to make the first cylinder 21 and the third cylinder 31 in a horizontal position. When the first cylinder 21 and the third cylinder 31 are in a horizontal position, the first cylinder 21 and the third cylinder 31 extend to make the first support shoe 23 and the second support shoe 33 fit the hole wall, providing sufficient support force for the shaft boring machine to prevent the shaft boring machine from sinking due to gravity. The swing cylinder 52 is distributed on both sides of the excavation device 5. The extension and retraction of the swing cylinder 52 drive the swing of the telescopic arm 51, and then the cutter head 53 excavates the excavation surface. Because the telescopic arm 51 can extend a certain distance, the excavation depth of the cutter head 53 can be increased. Starting from the rotation starting point, the slewing device 4 can rotate clockwise, and starting from the rotation starting point, it can rotate counterclockwise to achieve 360-degree excavation of the cutter head 53. Because the excavation surface is rectangular, there is a certain blind spot when the cutter head 53 excavates. In order to avoid the blind spot in the excavation surface, all the third cylinders 31 in the second gripper device 3 are retracted, and the second gripper 33 is separated from the hole wall. At the same time, the first cylinder 21 on one side of the first gripper device 2 is extended, and the first cylinder 21 on the other side is retracted. The first gripper 23 is still tightly fitted with the hole wall. After the shield body reaches the position, the third cylinder 31 in the second gripper device 3 is extended to make the second gripper 33 fit with the hole wall, and then the rotating device 4 is combined with the excavation device 5 to excavate the blind spot. If there is an excavation blind spot on the side of the second gripper device 3, then based on the existing position of the shield body 1, the first cylinders 21 in the first gripper device 2 are all retracted, and the first grippers 23 are away from the cave wall. At the same time, the third cylinders 31 on one side of the second gripper device 3 are extended, and the third cylinders 31 on the other side are retracted, and all the second grippers 33 are in contact with the cave wall. After the shield body reaches the position, the first cylinders 21 of the first gripper device 2 are all extended, and the first grippers 23 are in contact with the cave wall. Then the rotating device 4 and the excavating device 5 are combined to excavate the blind spot.

[0056] See also Figure 3 As shown, in order to increase the working efficiency of the rectangular shaft boring machine, after the shaft boring machine completes the excavation layer, the boring machine needs to perform the next excavation face action, retract all the third cylinders 31 in the second support shoe device 3, separate the second support shoe 33 from the tunnel wall, retract the fourth cylinder 32, and extend the third cylinder 31 after being inclined at an angle of 45°-50° with the shield body 1. Since the second support shoe 33 and the third cylinder 31 are connected by the first ball head seat 312, the second support shoe 33 can rotate at an angle less than 10°. After the second support shoe 33 can fit the tunnel wall, all the first cylinders 21 in the first support shoe device 2 are retracted, the first support shoe 23 is separated from the tunnel wall, and the fourth cylinder 32 in the second support shoe device 3 is extended to make the third cylinder 31 in a horizontal state. The whole process can be repeated many times until the shield body 1 reaches the predetermined position, and then excavation is carried out.

[0057] See also Figure 7As shown, after the shaft boring machine completes an excavation surface work, the telescopic arm 51 is in an extended state, the swing arm 52 is adjusted to adjust the position of the telescopic arm 51 to the axial position, and the fifth oil cylinder 61 in the limit device 6 retracts to drive the limit block 62 to move, thereby releasing the axial movement of the rotating device 4. When the telescopic arm 51 retracts and the rotating device 4 descends to another limit hole 44, the fifth oil cylinder 61 extends to drive the limit block 62 to re-extend into the axial limit hole 44 in the rotating device 4, thereby limiting the axial movement of the rotating device 4, and the shaft boring machine resumes excavation.

[0058] When the slewing device 4 cannot be lowered any further, the axial restriction of the slewing device 4 needs to be released, and the first gripper device 2 and the gripper system 2 cooperate to lower the shield body 1, and the shaft boring machine starts excavation again. If any part of the slewing device 4 and the excavation device 5 is damaged, the entire slewing device 4 and the excavation device 5 can be lifted to the ground for repair.

[0059] As a further embodiment of the present invention, when the rotary device 4 is in the process of descending, the cutter head 53 plays a supporting role. In order to avoid damage to the cutter head in this process, a third shoe device 7 is further provided in the rotary device 4, and the third shoe device 7 includes a sixth oil cylinder 71 and a third shoe 73; the fixed end of the sixth oil cylinder 71 is fixedly connected to the rotary device 4, and the driving end of the sixth oil cylinder 71 is hinged to the third shoe 73. Specifically, a second pressure cap 72 is installed on the driving end of the sixth oil cylinder 71, and a second ball head hinge structure is installed on the third shoe 73. The second ball head seat 731 in the second ball head hinge structure is fixedly connected to the third shoe 73, and the second ball head 711 in the second ball head hinge structure is fixedly connected to the second pressure cap 72. By adopting a ball hinge between the sixth oil cylinder 71 and the third shoe 73, the contact area between the third shoe 73 and the excavation surface is increased.

[0060] When the shaft boring machine completes one layer of excavation and needs to proceed to the next layer of excavation, the sixth oil cylinder 71 in the third support shoe device 7 extends, the third support shoe 73 fits tightly against the excavation surface, the fifth oil cylinder 61 in the limit device 6 retracts, the limit block 62 separates from the rotary device 4, contacts the axial constraint of the rotary device 4, and the sixth oil cylinder 71 of the third support shoe device 7 retracts, driving the rotary device 4 to descend. When it reaches the next limit hole 44, the sixth oil cylinder 71 stops retracting, the fifth oil cylinder 61 in the limit device 6 extends to drive the limit block 62 to re-limit the axial constraint of the rotary device 4, the sixth oil cylinder 71 continues to retract to the original position, and the shaft boring machine once again excavates the excavation surface.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rectangular shaft boring machine, characterized in that: It comprises a shield body (1), and a first gripper device (2), a second gripper device (3), a rotating device (4) and an excavating device (5) arranged on the shield body (1); The first gripper shoe device (2) comprises a first gripper shoe (23), the first gripper shoe (23) being connected to the shield body (1) via a first driving member, and the first gripper shoe (23) being driven by the first driving member to move in a direction approaching or moving away from the shield body (1); The second gripper shoe device (3) comprises a second gripper shoe (33), the second gripper shoe (33) being connected to the shield body (1) via a third driving member, and the second gripper shoe (33) being driven by the third driving member to move in a direction approaching or away from the shield body (1); The rotating device (4) is connected to the shield body (1) and the excavating device (5) and is used to drive the excavating device (5) to perform a rotating motion; The excavation device (5) comprises a cutter head (53) for excavating the soil layer.

2. The rectangular shaft boring machine according to claim 1, characterized in that: The first shoe support device (2) further comprises a second driving member which is arranged obliquely, wherein the driving end of the second driving member is hinged to the fixed end of the first driving member, and the fixed end of the second driving member is hinged to the shield body (1), and is used for driving the first driving member to extend or retract relative to the shield body (1) at an angle of 30°-60°. The second support shoe device (3) further comprises a fourth driving member which is arranged obliquely, wherein the driving end of the fourth driving member is hinged to the fixed end of the second driving member, and the fixed end of the fourth driving member is hinged to the shield body (1), and is used for driving the second driving member to extend or retract relative to the shield body (1) at an angle of 30°-60°.

3. The rectangular shaft boring machine according to claim 2, characterized in that: A first ball head hinge structure is also provided between the second driving member and the shield body (1); a first ball head seat (312) in the first ball head hinge structure is fixedly connected to the shield body (1); and a first ball head (331) in the first ball head hinge structure is fixedly connected to the driving end of the second driving member.

4. The rectangular shaft boring machine according to claim 2, characterized in that: The first gripper shoe device (2) is provided with two groups symmetrically arranged along the central axis of the shield body (1), and a single group of the first gripper shoe device (2) is provided with at least two pieces arranged in parallel; The second gripper shoe device (3) is provided with two groups symmetrically arranged along the central axis of the shield body (1), and a single group of the second gripper shoe device (3) is provided with at least two pieces arranged in parallel; The end surface of the shield body (1) used to set the first shoe device (2) and the end surface used to set the second shoe device (3) are perpendicular to each other.

5. The rectangular shaft boring machine according to any one of claims 1 to 4, characterized in that: The rotating device (4) is also provided with an anti-twist component (43) and an axial limiting hole (44); The anti-twist assembly (43) is used to limit the torque generated by the rotating device (4) during operation; The axial limiting hole (44) is provided with at least one arranged in parallel with the second support shoe device (3); and a limiting device (6) is installed in each single axial limiting hole (44), and the limiting device (6) is used to limit the axial movement of the rotating device (4).

6. The rectangular shaft boring machine according to claim 5, characterized in that: The limiting device (6) comprises a fifth driving member and a limiting block (62); one end of the fifth driving member is fixedly connected to the shield body (1), and the limiting block (62) is installed on the other end of the fifth driving member. When the shaft boring machine is assembled, the fifth driving member in the limiting device (6) drives the limiting block (62) to extend into the axial limiting hole (44) to limit the axial movement of the rotary device (4).

7. The rectangular shaft boring machine according to claim 6, characterized in that: A third support shoe device (7) is also arranged in the rotating device (4); The third support shoe device (7) comprises a sixth driving member and a third support shoe (73); the fixed end of the sixth driving member is fixedly connected to the rotating device (4), and the driving end of the sixth driving member is hinged to the third support shoe (73) for driving the third support shoe (73) to move in a direction close to or away from the rotating device (4).

8. The rectangular shaft boring machine according to claim 7, characterized in that: A second ball head hinge structure is provided between the sixth driving member and the third support shoe (73); a second ball head seat (731) in the second ball head hinge structure is fixedly connected to the third support shoe (73); and a second ball head (711) in the second ball head hinge structure is fixedly connected to the driving end of the sixth driving member.

9. The rectangular shaft boring machine according to any one of claims 6 to 8, characterized in that: The excavation device (5) further comprises a telescopic arm (51) and a swing cylinder (52); the telescopic arm (51) is hinged to the driving end of the rotary device (4); one end of the swing cylinder (52) is hinged to the rotary device (4); the other end of the swing cylinder (52) is hinged to the telescopic arm (51); the swing cylinder (52) is used to drive the telescopic arm (51) to swing; the cutter head (53) is mounted on one end of the telescopic arm (51) away from the rotary device (4).

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