Roadheader main shaft rotating mechanism and working method thereof

Abstract

The invention discloses a main shaft rotating mechanism of a heading machine and a working method of the main shaft rotating mechanism. The main shaft rotating mechanism comprises a fixed connecting seat, a hydraulic motor, a planetary reducer, a pinion shaft, a slewing bearing inner gear rotor bearing, a slewing bearing stator and a rotating connecting seat, the upper end of the fixed connecting seat is fixedly connected with a heading machine propelling mechanism, the lower end of the fixed connecting seat is fixedly connected with a slewing bearing stator, a slewing bearing inner gear rotor bearing is fixedly connected with the upper end of the rotary connecting seat, and the lower end of the rotary connecting seat is connected with a drill bit or a cutter head; the hydraulic motor is in driving connection with the planetary reducer, the planetary reducer is mounted on the fixed connecting seat and is in driving connection with the pinion shaft, the pinion shaft is in gear transmission connection with an inner gear of the slewing bearing inner gear rotor bearing, and the slewing bearing inner gear rotor bearing is mounted in the slewing bearing stator. A main shaft rotating mechanism is designed to be lightweight, a heavy slewing bearing with inner teeth is selected as a main bearing, the overall structure is compact, the occupied axial space is small, and the impact resistance is high.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel and shaft excavation, and more specifically to a main shaft rotating mechanism of a tunneling machine and a working method thereof. Background Art

[0002] The roadheader is the main equipment for mechanized excavation of tunnels and shafts. Its body is stably supported and uses the extended main shaft to provide powerful rotational power to drive the drill bit or cutting arm to break rocks.

[0003] In the prior art, in order to achieve powerful rotational power, the main bearing and the driving device are large in size and occupy a large axial space. However, the impact resistance of the large-volume main bearing is inevitably weakened, thus affecting its application underground and in tunnels. Summary of the invention

[0004] To this end, the technical problem to be solved by the present invention is to provide a main shaft rotation mechanism for a tunnel boring machine to solve the problems of large axial space occupation and weak impact resistance of the main shaft rotation mechanism in the prior art.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A main shaft rotation mechanism of a tunnel boring machine comprises a fixed connection seat, a hydraulic motor, a planetary reducer, a pinion shaft, a slewing bearing internal gear rotor bearing, a slewing bearing stator and a slewing connection seat; the upper end of the fixed connection seat is fixedly connected to the tunnel boring machine propulsion mechanism, the lower end of the fixed connection seat is fixedly connected to the slewing bearing stator by bolts, the slewing bearing internal gear rotor bearing is fixedly connected to the upper end of the slewing connection seat by bolts, and the lower end of the slewing connection seat is connected to a drill bit or a cutter disc; the hydraulic motor is driven and linked to the planetary reducer, the planetary reducer is installed on the fixed connection seat, the power output end of the planetary reducer is driven and connected to the pinion shaft, the pinion shaft is connected to the internal gear of the slewing bearing internal gear rotor bearing by gear transmission, and the slewing bearing internal gear rotor bearing is installed in the slewing bearing stator.

[0007] In the above-mentioned main shaft rotation mechanism of the tunnel boring machine, the hydraulic motor and the planetary reducer are matched to form a group, and there are more than two groups. Multiple groups of the hydraulic motor and the planetary reducer cooperate to drive multiple groups of the pinion shafts, and then jointly drive the slewing bearing internal gear rotor bearing through gear transmission, so that the slewing bearing internal gear rotor bearing produces positive and negative continuous rotation motion relative to the slewing bearing stator.

[0008] The above-mentioned tunnel boring machine main shaft rotation mechanism, the fixed connecting seat includes an outer cylinder and a base plate, the upper end of the outer cylinder is provided with an external flange, the lower end of the outer cylinder is provided with a base plate, and the middle part of the base plate is a hollow structure; the tunnel boring machine propulsion mechanism is fixedly connected to the outer cylinder through the external flange; the upper plate surface of the base plate is fixedly connected to the inner wall surface of the outer cylinder through the first reinforcing rib.

[0009] In the above-mentioned main shaft rotation mechanism of a tunnel boring machine, more than two reinforcing plates extend from the base plate toward the middle, and the more than two reinforcing plates are evenly arranged along the circumferential direction of the base plate; a reducer seat is fixedly installed on each of the reinforcing plates, and the outer wall surface of the reducer seat, the upper plate surface of the reinforcing plate and the inner wall surface of the outer cylinder are fixedly connected by second reinforcing ribs; a circular hole is opened on the reinforcing plate corresponding to the opening position at the lower end of the reducer seat.

[0010] In the above-mentioned main shaft rotation mechanism of a tunnel boring machine, the reducer seat is a cylindrical structure with a diameter decreasing from large to small from top to bottom, the upper end surface of the reducer seat is set as a first mounting plane, the opening of the reducer seat is set as a first mounting stop, the small cylinder at the lower end of the reducer seat is a second mounting stop, and the diameter of the large cylinder at the upper end of the reducer seat is larger than the diameter of the first mounting stop, and the diameter of the first mounting stop is larger than the diameter of the second mounting stop; the lower end of the planetary reducer passes through the second mounting stop from the first mounting stop of the reducer seat and is flush with the reinforcement plate, and the lower plane of the mounting flange of the planetary reducer cooperates with the first mounting plane and is fixedly connected by bolts.

[0011] In the above-mentioned main shaft rotation mechanism of a tunnel boring machine, an annular groove is provided at the lower end of the fixed connecting seat corresponding to the position of the slewing bearing stator, the bottom of the annular groove is a second mounting plane, the opening of the annular groove is a third mounting stop, the slewing bearing stator is embedded in the annular groove, and the upper end surface of the slewing bearing stator abuts against the second mounting plane.

[0012] In the above-mentioned main shaft rotation mechanism of a tunnel boring machine, a protective cover is provided on the outer side of the slewing bearing stator, the cross-section of the protective cover is L-shaped, and a mounting ear is provided at the upper end of the L-shaped long side of the protective cover, and the protective cover is threadedly connected to the base plate through the mounting ear; the L-shaped short side of the protective cover is adjacent to the outer wall of the rotating connection seat; a second annular groove is provided at the L-shaped short side of the protective cover, and the second annular groove uses the L-shaped short side of the protective cover as the groove bottom, a rotating sealing ring is fixedly installed in the second annular groove, and a pressure cover is provided at the notch of the second annular groove, one end of the pressure cover is connected to the side wall of the second annular groove by bolts, and the other end of the pressure cover is adjacent to the outer wall of the rotating connection seat.

[0013] In the above-mentioned main shaft rotation mechanism of the tunnel boring machine, the hydraulic motor and the planetary reducer are matched to form a group, and there are 5 groups in total.

[0014] The working method of the main shaft rotating mechanism of the tunnel boring machine comprises the following steps:

[0015] (A) Bolt the driving mechanism of the tunnel boring machine to the fixed connection seat through an external flange, and bolt the drill bit or cutter head to the mounting ear at the lower end of the rotating connection seat;

[0016] (B) According to the needs of on-site operations, the hydraulic motor is started, and the hydraulic motor drives the planetary reducer to drive the pinion shaft to rotate. The pinion shaft is connected to the internal gear of the slewing bearing internal gear rotor bearing through a gear transmission, so that the slewing bearing internal gear rotor bearing generates positive and negative continuous rotation motion relative to the slewing bearing stator;

[0017] (C) The internal gear rotor bearing of the slewing support is fixedly connected to the upper end of the rotating connection seat by bolts, thereby driving the rotating connection seat to rotate continuously, driving the drill bit or cutter head to rotate, and realizing excavation;

[0018] (D) When the drill bit or cutter disc is stopped or not rotating, the planetary reducer is controlled to brake to generate a sufficiently large static torque.

[0019] The above-mentioned working method of the main shaft rotation mechanism of a tunnel boring machine is characterized in that a protective cover is provided on the outer side of the slewing bearing stator, the cross-section of the protective cover is L-shaped, and a mounting ear is provided at the upper end of the L-shaped long side of the protective cover, and the protective cover is threadedly connected to the base plate through the mounting ear; the L-shaped short side of the protective cover is adjacent to the outer wall of the slewing connection seat; a second annular groove is provided at the L-shaped short side of the protective cover, and the second annular groove uses the L-shaped short side of the protective cover as the groove bottom, a rotating sealing ring is fixedly installed in the second annular groove, and a pressure cover is provided at the notch of the second annular groove, one end of the pressure cover is connected to the side wall of the second annular groove by bolts, and the other end of the pressure cover is adjacent to the outer wall of the slewing connection seat, and the rotating sealing ring blocks dust, water and other pollutants from outside the main shaft of the tunnel boring machine, so that the slewing support remains well lubricated.

[0020] The technical solution of the present invention achieves the following beneficial technical effects:

[0021] 1. The main shaft rotating mechanism of the present invention is designed to be lightweight overall, and a heavy-duty slewing bearing with internal teeth is selected as the main bearing. The overall structure is compact, the axial space is small, the impact resistance is strong, and it is more convenient to use in underground and tunnels. At the same time, the hollow structure design is more conducive to the installation of personnel, materials and pipeline channels.

[0022] 2. The present invention drives multiple pinion shafts through the cooperation of multiple groups of hydraulic motors and reducers, and utilizes the gear transmission connection between the pinion shaft and the internal gear of the slewing bearing internal gear rotor bearing, thereby driving the slewing bearing internal gear rotor bearing (main shaft) of the tunnel boring machine to rotate forward and reverse continuously, thereby achieving small axial space occupancy and increased driving force.

[0023] 3. The reducer seat is arranged in the circumferential direction on the reinforcement plate extended from the bottom plate. The middle part of the bottom plate is a hollow structure, which can be used as a passage from the main body of the tunnel boring machine to the drill bit, facilitating the passage of personnel, pipelines, materials, etc.

[0024] 4. The diameter of the first mounting stop at the upper opening of the reducer seat is larger than the second mounting stop in the middle, so that the planetary reducer can be accurately installed in the reducer seat, thereby realizing the precise positioning of the planetary reducer and the pinion shaft, the slewing bearing internal gear rotor and the slewing bearing stator. The reducer seat is provided with two second reinforcement ribs, which can stabilize and reinforce the reducer seat and reduce the disturbance caused by the high-speed rotation of the hydraulic motor, planetary reducer and pinion shaft.

[0025] 5. A protective cover is provided on the outside of the slewing bearing stator. The cross-section of the protective cover is designed in an L-shaped structure. The upper end of the long side of the L-shape is fixedly connected to the fixed connection seat, and the short side of the L-shape is adjacent to the outer wall of the slewing bearing stator. A second annular groove is provided, and a rotating sealing ring is installed in the second annular groove and a pressure cover is provided at the notch. On the one hand, it will not hinder the rotation of the slewing bearing stator. On the other hand, it can block the interference of dust, water and other pollutants from the outside of the main shaft of the tunnel boring machine, so that the internal gear rotor bearing of the slewing bearing and the slewing bearing stator are well lubricated. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic structural diagram of the main shaft rotation mechanism of the tunnel boring machine of the present invention;

[0027] Figure 2 A schematic cross-sectional structure diagram of the main shaft rotation mechanism of the tunnel boring machine of the present invention;

[0028] Figure 3 A partial enlarged view of the protective cover and the slewing bearing stator of the main shaft rotating mechanism of the tunnel boring machine of the present invention;

[0029] Figure 4 A schematic structural diagram of a fixed connection seat of a main shaft rotating mechanism of a tunnel boring machine according to the present invention;

[0030] Figure 5 A schematic cross-sectional view of the fixed connection seat of the main shaft rotating mechanism of the tunnel boring machine of the present invention;

[0031] Figure 6 Figure 5 A partial enlarged view of position A of the fixed connection seat of the main shaft rotating mechanism of the tunnel boring machine of the present invention.

[0032] The reference numerals in the figure are represented as follows: 1-fixed connecting seat; 2-hydraulic motor; 3-planetary reducer; 4-pinion shaft; 5-slewing bearing internal gear rotor bearing; 6-slewing bearing stator; 7-protective cover; 8-rotating sealing ring; 9-pressure cover; 10-rotating connecting seat; 11-second annular groove; 101-first reinforcing rib; 102-external flange; 103-second reinforcing rib; 104-outer cylinder; 105-reducer seat; 106-bottom plate; 107-first mounting plane; 108-first mounting stop; 109-second mounting stop; 110-second mounting plane; 111-third mounting stop; 112-reinforcement plate. DETAILED DESCRIPTION

[0033] like Figure 1 and Figure 2 The main shaft rotating mechanism of the tunnel boring machine shown in the figure includes a fixed connecting seat 1, a hydraulic motor 2, a planetary reducer 3, a pinion shaft 4, a slewing bearing internal gear rotor bearing 5, a slewing bearing stator 6 and a rotating connecting seat 10; the upper end of the fixed connecting seat 1 is fixedly connected to the tunnel boring machine propulsion mechanism, the lower end of the fixed connecting seat 1 is fixedly connected to the slewing bearing stator 6 by bolts, the slewing bearing internal gear rotor bearing 5 is fixedly connected to the upper end of the rotating connecting seat 10 by bolts, and the lower end of the rotating connecting seat 10 is connected to a drill bit or a cutter head; the hydraulic motor 2 is driven and linked to the planetary reducer 3, the planetary reducer 3 is installed on the fixed connecting seat 1, the power output end of the planetary reducer 3 is driven and connected to the pinion shaft 4, the pinion shaft 4 is connected to the internal gear of the slewing bearing internal gear rotor bearing 5 by gear transmission, and the slewing bearing internal gear rotor bearing 5 is installed in the slewing bearing stator 6.

[0034] The hydraulic motor 2 and the planetary reducer 3 are matched to form a group, and there are more than two groups. Multiple groups of the hydraulic motor 2 and the planetary reducer 3 cooperate to drive multiple groups of the pinion shafts 4, and then jointly drive the slewing bearing internal gear rotor bearing 5 through gear transmission, so that the slewing bearing internal gear rotor bearing 5 produces positive and negative continuous rotation motion relative to the slewing bearing stator 6.

[0035] In this embodiment, the hydraulic motor 2 and the planetary reducer 3 are 5 groups, which are evenly arranged and mounted on the reinforcing plate 12 of the fixed connection seat 1.

[0036] According to the needs of on-site operations, the hydraulic motor 2 is started, and the hydraulic motor 2 drives the planetary reducer 3 to drive the pinion shaft 4 to rotate. The pinion shaft 4 is connected to the internal gear of the slewing bearing internal gear rotor bearing 5 through a gear transmission, so that the slewing bearing internal gear rotor bearing 5 produces positive and negative continuous rotational motion relative to the slewing bearing stator 6; the slewing bearing internal gear rotor bearing 5 is fixedly connected to the upper end of the rotating connecting seat 10 through bolts, thereby driving the rotating connecting seat 10 to rotate continuously, driving the drill bit or cutter head to rotate, and realizing excavation; at the same time, when the drill bit is stopped or not rotating, the planetary reducer 3 is operated for braking, which can generate a sufficiently large static torque.

[0037] In order to achieve stable installation of the slewing bearing internal gear rotor bearing 5 and the slewing bearing stator 6, the present invention optimizes the design of the fixed connection seat and the rotating connection seat.

[0038] The fixed connection seat 1 includes an outer cylinder 104 and a bottom plate 106. An external flange 102 is provided at the upper end of the outer cylinder 104. The tunnel boring machine propulsion mechanism is fixedly connected to the outer cylinder 104 via the external flange 102. The external flange 102 is provided to facilitate the assembly between the tunnel boring machine propulsion mechanism and the fixed connection seat 1 of the present invention.

[0039] The lower end of the outer cylinder 104 is provided with a bottom plate 106, and the middle part of the bottom plate 106 is a hollow structure; the upper plate surface of the bottom plate 106 is fixedly connected to the inner wall surface of the outer cylinder 104 through the first reinforcing rib 101. Five reinforcing plates 112 extend from the middle of the bottom plate 106, and the reinforcing plates 112 are evenly arranged along the circumference of the bottom plate 106. The middle part of the reinforcing plates is not connected, that is, the middle part is also a hollow structure. The hollow structure can be used as a passage from the main body of the tunnel boring machine to the drill bit, which is convenient for personnel, pipelines, materials, etc. to pass through.

[0040] A reducer seat 105 is fixedly mounted on each of the reinforcing plates 112, and the outer wall surface of the reducer seat 105, the upper plate surface of the reinforcing plate 112 and the inner wall surface of the outer cylinder 104 are fixedly connected by the second reinforcing ribs 103; the reinforcing plate 112 is provided with a circular hole corresponding to the lower end opening position of the reducer seat 105. Two second reinforcing ribs are provided on each reducer seat 105, which can stabilize and reinforce the reducer seat 105 and reduce the disturbance caused by the high-speed rotation of the hydraulic motor, the planetary reducer and the pinion shaft.

[0041] The reducer seat 105 is a cylindrical structure with a diameter that decreases from large to small from top to bottom. The upper end surface of the reducer seat 105 is set as a first mounting plane 107, and the opening of the reducer seat 105 is set as a first mounting stop 108. The small cylinder at the lower end of the reducer seat 105 is a second mounting stop 109, and the diameter of the large cylinder at the upper end of the reducer seat 105 is larger than the diameter of the first mounting stop 108, and the diameter of the first mounting stop 108 is larger than the diameter of the second mounting stop 109; the lower end of the planetary reducer 3 passes through the second mounting stop 109 from the first mounting stop 108 of the reducer seat 105 and is flush with the reinforcing plate 112, and the lower plane of the mounting flange of the planetary reducer 3 cooperates with the first mounting plane 107 and is fixedly connected by bolts. A first mounting stop 108 and a second mounting stop 109 of different diameters are provided on the inner side wall of the reducer seat 105, so that the planetary reducer 3 can be accurately mounted on the reducer seat 105, thereby achieving accurate positioning between the pinion shaft 4, the slewing bearing internal gear rotor bearing 5 and the slewing bearing stator 6, thereby improving the efficiency of the slewing bearing.

[0042] In order to achieve the coordinated installation of the slewing bearing stator 6 and the fixed connecting seat 1, an annular groove is provided at the lower end of the fixed connecting seat 1 of the present invention corresponding to the position of the slewing bearing stator 6, the bottom of the annular groove is a second mounting plane 110, and the opening of the annular groove is a third mounting stop 111, so that the slewing bearing stator 6 can be embedded in the annular groove, and the upper end surface of the slewing bearing stator 6 abuts against the second mounting plane 110, so that the slewing bearing stator 6 can be stably and accurately embedded in the annular groove and fixedly connected with bolts.

[0043] In order to prevent interference from dust, water and other pollutants outside the main shaft of the tunnel boring machine, the present invention provides a protective cover 7 on the outside of the slewing bearing stator 6; the cross-section of the protective cover 7 is designed in an L-shaped structure: a mounting ear is provided at the upper end of the L-shaped long side of the protective cover 7, and the protective cover 7 is threadedly connected to the base plate 106 through the mounting ear; the L-shaped short side of the protective cover 7 is adjacent to the outer wall of the rotating connection seat 10; a second annular groove 11 is provided at the L-shaped short side of the protective cover 7, and the second annular groove 11 uses the L-shaped short side of the protective cover 7 as the groove bottom, and a rotating sealing ring 8 is fixedly installed in the second annular groove 11, and a pressure cover 9 is provided at the notch of the second annular groove 11, one end of the pressure cover 9 is connected to the side wall of the second annular groove 11 by bolts, and the other end of the pressure cover 9 is adjacent to the outer wall of the rotating connection seat 10. A second annular groove is provided, and a rotating sealing ring is installed in the second annular groove and a pressure cover is provided at the groove. On the one hand, it will not hinder the rotation of the rotating connecting seat, and on the other hand, it can block the interference of dust, water and other pollutants from the outside of the main shaft of the tunnel boring machine, so as to maintain good lubrication between the internal gear rotor bearing of the slewing bearing and the slewing bearing stator.

[0044] The specific working method of the main shaft rotation mechanism of the tunnel boring machine is:

[0045] A. Connecting the tunnel boring machine propulsion mechanism, the main shaft rotation mechanism and the drill bit or cutter head: Bolt the tunnel boring machine propulsion mechanism to the fixed connection seat 1 through the external flange 102, and bolt the drill bit or cutter head to the mounting ear at the lower end of the rotating connection seat 10;

[0046] B. According to the on-site operation requirements, the hydraulic motor 2 is started, and the 5 groups of hydraulic motors 2 drive the planetary reducer 3 to drive the pinion shaft 4 to rotate. The 5 groups of pinion shafts 4 are connected to the internal gear of the slewing bearing internal gear rotor bearing 5 through gear transmission, so that the slewing bearing internal gear rotor bearing 5 produces positive and negative continuous rotational motion relative to the slewing bearing stator 6; multiple groups of the hydraulic motors and the planetary reducers cooperate to jointly drive the pinion shaft to achieve small axial space occupation and increased driving force.

[0047] C. The slewing bearing inner gear rotor bearing 5 is fixedly connected to the upper end of the rotary connection seat 10 by bolts, thereby driving the rotary connection seat 10 to rotate continuously, driving the drill bit or cutter head to rotate, and realizing excavation;

[0048] D. When the drill bit or cutter disc stops or is not rotating, the planetary reducer 3 is controlled to brake to generate a sufficiently large static torque.

[0049] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. A main shaft rotation mechanism for a tunnel boring machine, characterized in that: The invention comprises a fixed connection seat (1), a hydraulic motor (2), a planetary reducer (3), a pinion shaft (4), a slewing bearing internal gear rotor bearing (5), a slewing bearing stator (6) and a rotating connection seat (10); the upper end of the fixed connection seat (1) is fixedly connected to the driving mechanism of the tunnel boring machine, the lower end of the fixed connection seat (1) is fixedly connected to the slewing bearing stator (6) by bolts, the slewing bearing internal gear rotor bearing (5) is fixedly connected to the upper end of the rotating connection seat (10) by bolts, and the The lower end of the rotating connection seat (10) is connected to a drill bit or a cutter head; the hydraulic motor (2) is drive-linked to the planetary reducer (3); the planetary reducer (3) is mounted on the fixed connection seat (1); the power output end of the planetary reducer (3) is drive-connected to the pinion shaft (4); the pinion shaft (4) is connected to the internal gear of the slewing bearing internal gear rotor bearing (5) through a gear transmission; the slewing bearing internal gear rotor bearing (5) is mounted in the slewing bearing stator (6).

2. A main shaft rotation mechanism for a tunnel boring machine according to claim 1, characterized in that: The hydraulic motor (2) and the planetary reducer (3) are matched to form a group, and there are more than two groups. Multiple groups of the hydraulic motor (2) and the planetary reducer (3) cooperate to drive multiple groups of the pinion shafts (4), and then jointly drive the slewing bearing internal gear rotor bearing (5) through gear transmission, so that the slewing bearing internal gear rotor bearing (5) generates positive and negative continuous rotational motion relative to the slewing bearing stator (6).

3. The main shaft rotation mechanism of a tunnel boring machine according to claim 1, characterized in that: The fixed connection seat (1) comprises an outer cylinder (104) and a bottom plate (106); an external flange (102) is arranged at the upper end of the outer cylinder (104); a bottom plate (106) is arranged at the lower end of the outer cylinder (104); the middle part of the bottom plate (106) is a hollow structure; the tunnel boring machine propulsion mechanism is fixedly connected to the outer cylinder (104) via the external flange (102); and the upper plate surface of the bottom plate (106) is fixedly connected to the inner wall surface of the outer cylinder (104) via a first reinforcing rib (101).

4. A main shaft rotation mechanism for a tunnel boring machine according to claim 3, characterized in that: The bottom plate (106) has more than two reinforcing plates (112) extending toward the middle, and the more than two reinforcing plates (112) are evenly arranged along the circumferential direction of the bottom plate (106); a reducer seat (105) is fixedly mounted on each of the reinforcing plates (112), and the outer wall surface of the reducer seat (105), the upper plate surface of the reinforcing plate (112) and the inner wall surface of the outer cylinder (104) are fixedly connected via a second reinforcing rib (103); and a circular hole is provided on the reinforcing plate (112) corresponding to the lower end opening position of the reducer seat (105).

5. A main shaft rotation mechanism for a tunnel boring machine according to claim 4, characterized in that: The reducer seat (105) is a cylindrical structure with a diameter that decreases from large to small from top to bottom. The upper end surface of the reducer seat (105) is set as a first mounting plane (107). The opening of the reducer seat (105) is set as a first mounting stop (108). The small cylinder at the lower end of the reducer seat (105) is a second mounting stop (109). The diameter of the large cylinder at the upper end of the reducer seat (105) is larger than the diameter of the first mounting stop (108). The diameter of the first mounting stop (108) is larger than the diameter of the second mounting stop (109). The lower end of the planetary reducer (3) passes through the second mounting stop (109) from the first mounting stop (108) of the reducer seat (105) and is flush with the reinforcing plate (112). The lower plane of the mounting flange of the planetary reducer (3) cooperates with the first mounting plane (107) and is fixedly connected by bolts.

6. A main shaft rotation mechanism for a tunnel boring machine according to claim 3, characterized in that: An annular groove is provided at the lower end of the fixed connection seat (1) at a position corresponding to the slewing bearing stator (6); the bottom of the annular groove is a second mounting plane (110); the opening of the annular groove is a third mounting stop (111); the slewing bearing stator (6) is embedded in the annular groove, and the upper end surface of the slewing bearing stator (6) abuts against the second mounting plane (110).

7. The main shaft rotation mechanism of a tunnel boring machine according to claim 1, characterized in that: A protective cover (7) is provided on the outer side of the slewing bearing stator (6). The cross section of the protective cover (7) is L-shaped. A mounting ear is provided at the upper end of the L-shaped long side of the protective cover (7). The protective cover (7) is threadedly connected to the base plate (106) via the mounting ear. The L-shaped short side of the protective cover (7) is adjacent to the outer wall of the rotary connection seat (10). A second annular groove (11) is provided at the L-shaped short side of the protective cover (7). The second annular groove (11) uses the L-shaped short side of the protective cover (7) as the groove bottom. A rotary sealing ring (8) is fixedly installed in the second annular groove (11). A pressure cover (9) is provided at the notch of the second annular groove (11). One end of the pressure cover (9) is connected to the side wall of the second annular groove (11) by bolts, and the other end of the pressure cover (9) is adjacent to the outer wall of the rotary connection seat (10).

8. The main shaft rotation mechanism of a tunnel boring machine according to claim 2, characterized in that: The hydraulic motor (2) and the planetary reducer (3) are matched to form a group, and there are 5 groups in total.

9. A working method of a main shaft rotating mechanism of a tunnel boring machine according to any one of claims 1 to 8, characterized in that: The steps include: (A) bolting the driving mechanism of the tunnel boring machine to the fixed connection seat (1) via an external flange (102), and bolting the drill bit or cutter head to the mounting ear at the lower end of the rotating connection seat (10); (B) According to the on-site operation requirements, the hydraulic motor (2) is started, and the hydraulic motor (2) drives the planetary reducer (3) to drive the pinion shaft (4) to rotate. The pinion shaft (4) is connected to the internal gear of the slewing bearing internal gear rotor bearing (5) through a gear transmission, so that the slewing bearing internal gear rotor bearing (5) generates positive and negative continuous rotational motion relative to the slewing bearing stator (6); (C) The slewing bearing internal gear rotor bearing (5) is fixedly connected to the upper end of the rotary connection seat (10) by bolts, thereby driving the rotary connection seat (10) to rotate continuously, driving the drill bit or cutter head to rotate, and realizing excavation; (D) When the drill bit or cutter head stops or is not rotating, the planetary reducer (3) is controlled to brake to generate a sufficiently large static torque.

10. A working method of a main shaft rotating mechanism of a tunnel boring machine according to claim 9, characterized in that: A protective cover (7) is provided on the outer side of the slewing bearing stator (6). The cross section of the protective cover (7) is L-shaped. A mounting ear is provided at the upper end of the L-shaped long side of the protective cover (7). The protective cover (7) is threadedly connected to the base plate (106) through the mounting ear. The L-shaped short side of the protective cover (7) is adjacent to the outer wall of the slewing bearing seat (10). A second annular groove (11) is provided at the L-shaped short side of the protective cover (7). The second annular groove (11) takes the L-shaped short side of the protective cover (7) as the groove bottom. A rotary sealing ring (8) is fixedly installed in the second annular groove (11). A pressure cover (9) is provided at the notch of the second annular groove (11). One end of the pressure cover (9) is connected to the side wall of the second annular groove (11) by bolts. The other end of the pressure cover (9) is adjacent to the outer wall of the slewing bearing seat (10). The rotary sealing ring (8) blocks dust, water and other pollutants from outside the main shaft of the tunnel boring machine, so that the slewing bearing maintains good lubrication.

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