Main bearing structure of shield tunneling machine

Abstract

The utility model discloses a main bearing structure of a shield tunneling machine, which comprises a fixed part and a rotating part which are rotationally sleeved together, and a first main push roller is arranged between the fixed part and the rotating part; the main bearing structure of the shield tunneling machine further comprises at least one roller module capable of improving the bearing capacity of the main bearing structure, the roller module is provided with an annular runway and a second main pushing roller arranged between the annular runway and the rotating piece, and the annular runway is detachably connected to the radial inner side of the fixing piece. And the second main push roller and the first main push roller are arranged at an interval along the radial direction of the main bearing structure of the shield tunneling machine. The main bearing structure of the shield tunneling machine can solve the problems of insufficient bearing capacity and short design service life of the shield tunneling machine in the prior art, so that the main bearing structure of the shield tunneling machine can be applied to various different working conditions needing different bearing capacities.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel excavation equipment, in particular to a main bearing structure of a shield machine with high load-bearing capacity. Background Art

[0002] The main bearing is an important component of the shield machine during excavation. It transmits the motor output torque and cylinder thrust to the cutterhead, providing cutting force for the cutterhead. The main thrust rollers of the shield machine main bearing can be divided into single row and double row. When the rock breaking force required by the cutterhead is large, double row roller main bearings are generally selected. However, in the face of extremely hard rock, in order to ensure construction efficiency, the thrust force required by the cutterhead will be greatly increased. At this time, simply increasing the diameter of the main thrust roller of the main bearing can no longer meet the requirements of the main bearing life and bearing capacity under this working condition.

[0003] In recent years, research on the main drive bearing performance has mostly focused on increasing the service life of the main bearing by adding buffer devices, repairing the main bearings, and other measures. However, when dealing with extremely hard rock conditions, the current main drive bearings cannot meet the requirements of life and bearing capacity under such conditions. Utility Model Content

[0004] The utility model aims to provide a shield machine main bearing structure to solve the problems of insufficient bearing capacity and short design life of the shield machine in the prior art, so that the shield machine main bearing structure can be applied to various working conditions requiring different bearing capacities.

[0005] The above-mentioned implementation purpose of the utility model is mainly achieved by the following technical solutions:

[0006] A shield machine main bearing structure, which includes a fixed part and a rotating part rotatably sleeved together, a first main push roller is arranged between the fixed part and the rotating part; the shield machine main bearing structure also includes at least one roller module that can improve its bearing capacity, the roller module has an annular runway and a second main push roller arranged between the annular runway and the rotating part, the annular runway is detachably connected to the radial inner side of the fixed part, the second main push roller and the first main push roller are arranged at intervals along the radial direction of the shield machine main bearing structure.

[0007] In a preferred embodiment of the present invention, the fixing member includes a first outer ring and a second outer ring connected along the axial direction of the shield machine main bearing structure, and the rotating member is clamped between the first outer ring and the second outer ring.

[0008] In a preferred embodiment of the present invention, the front end face of the second outer ring and the rear end face of the rotating member are arranged relatively to each other along the axial direction of the main bearing structure of the shield machine and a first annular cavity is formed therebetween, and the first main push roller is located in the first annular cavity.

[0009] In a preferred embodiment of the present invention, the rotating member includes an inner ring and a gear ring connected along the radial direction of the shield machine main bearing structure, the gear ring is located radially inside the inner ring, and the first annular cavity is located between the second outer ring and the inner ring.

[0010] In a preferred embodiment of the present invention, the annular runway is detachably connected to the radial inner side of the second outer ring, the front end face of the annular runway and the rear end face of the gear ring are relatively arranged along the axial direction of the main bearing structure of the shield machine and a second annular cavity is formed therebetween, and the second main push roller is located in the second annular cavity.

[0011] In a preferred embodiment of the present invention, the inner ring has a first convex ring facing the second outer ring, and the first annular cavity and the second annular cavity are spaced apart by the first convex ring.

[0012] In a preferred embodiment of the present invention, a plurality of roller modules are provided on the main bearing structure of the shield machine, and the plurality of annular tracks of the plurality of roller modules are sequentially connected along the radial direction of the main bearing structure of the shield machine, and a second annular cavity is formed between each of the annular tracks and the rotating member.

[0013] In a preferred embodiment of the present invention, the annular track has a second convex ring facing the rotating member, and two adjacent second annular cavities are spaced apart by the second convex ring.

[0014] In a preferred embodiment of the present invention, main thrust retaining frames are provided in both the first annular cavity and the second annular cavity, and the first main thrust roller and the second main thrust roller are respectively provided in the retaining frames.

[0015] In a preferred embodiment of the present invention, the rotation axis direction of the first main push roller and the rotation axis direction of the second main push roller are respectively perpendicular to the axial direction of the main bearing structure of the shield machine, and the revolution axis direction of the circumferential rotation of the first main push roller and the revolution axis direction of the circumferential rotation of the second main push roller are respectively parallel to the axial direction of the main bearing structure of the shield machine.

[0016] In a preferred embodiment of the present invention, the inner side surface of the first outer ring and the outer side surface of the inner ring are arranged opposite to each other along the radial direction of the shield machine main bearing structure and a radial roller is provided therebetween. The rotation axis direction of the radial roller is parallel to the axial direction of the shield machine main bearing structure, and the revolution axis direction of the circumferential rotation of the radial roller is parallel to the axial direction of the shield machine main bearing structure.

[0017] In a preferred embodiment of the present invention, a radial retainer is disposed outside the radial roller, and the radial retainer is located between the first outer ring and the inner ring.

[0018] In a preferred embodiment of the present invention, the rear end face of the first outer ring and the front end face of the inner ring are arranged relatively to each other along the axial direction of the main bearing structure of the shield machine and an auxiliary thrust roller is provided between the two. The rotation axis direction of the auxiliary thrust roller is perpendicular to the axial direction of the main bearing structure of the shield machine, and the revolution axis direction of the circumferential rotation of the auxiliary thrust roller is parallel to the axial direction of the main bearing structure of the shield machine.

[0019] In a preferred embodiment of the present invention, an auxiliary thrust retainer is disposed outside the auxiliary thrust roller, and the auxiliary thrust retainer is located between the first outer ring and the inner ring.

[0020] Compared with the prior art, the technical solution described in the utility model has the following characteristics and advantages:

[0021] The shield machine main bearing structure described in the utility model is provided with a roller module between the fixed part and the rotating part. The number of main push rollers between the fixed part and the rotating part is increased by the roller module, thereby improving the bearing capacity of the shield machine main bearing, making it applicable to a variety of different actual operation scenarios. The number of roller modules can be adjusted according to the needs of the actual operation, thereby avoiding the problem of reduced service life of the shield machine main bearing structure due to insufficient bearing capacity in an operating environment requiring high bearing capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0023] Figure 1 This is a schematic diagram of the structure of the shield machine main bearing structure of the utility model without a roller module;

[0024] Figure 2 The present invention is a schematic structural diagram of a shield machine main bearing structure provided with a roller module.

[0025] Description of Figure Numbers:

[0026] 10. fixing member; 11. first outer ring; 12. second outer ring;

[0027] 20. Rotating member; 21. Inner ring; 22. Ring gear;

[0028] 30. Roller module; 31. Circular runway; 32. Second main push roller;

[0029] 40. first main push roller; 41. first annular cavity; 42. second annular cavity;

[0030] 50. first convex ring; 51. second convex ring;

[0031] 60, radial roller; 61, auxiliary thrust roller; 62, main thrust cage; 63, radial cage; 64, auxiliary thrust cage;

[0032] 70. Screws;

[0033] A. Radial direction; B. Axial direction; C. Rotation axis direction; D. Revolution axis direction; E. Rotation axis direction; F. Revolution axis direction; G. Rotation axis direction; H. Revolution axis direction. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0035] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0037] like Figure 1 and Figure 2As shown, the utility model provides a shield machine main bearing structure, which includes a fixed part 10 and a rotating part 20 that are rotatably sleeved together, and a first main push roller 40 is arranged between the fixed part 10 and the rotating part 20; the shield machine main bearing structure also includes at least one roller module 30 that can improve its bearing capacity, the roller module 30 has an annular runway 31 and a second main push roller 32 arranged between the annular runway 31 and the rotating part 20, the annular runway 31 is detachably connected to the radial inner side of the fixed part 10, and the second main push roller 32 and the first main push roller 40 are arranged at intervals along the radial direction A of the shield machine main bearing structure.

[0038] The shield machine main bearing structure described in the utility model is provided with at least one roller module 30 between the fixed part 10 and the rotating part 20. The number of main push rollers between the fixed part 10 and the rotating part 20 is increased by the roller module 30, thereby improving the bearing capacity of the shield machine main bearing structure, making it applicable to a variety of different operating scenarios. The number of roller modules 30 can be adjusted according to the actual operation needs, thereby avoiding the problem of reduced service life of the shield machine main bearing structure due to insufficient bearing capacity in an operating environment requiring high bearing capacity.

[0039] Specifically, Figure 1 and Figure 2 As shown, the fixed part 10 and the rotating part 20 are both annular components. The fixed part 10 is sleeved on the radially outer side of the rotating part 20, and a first main push roller 40 is arranged between the fixed part 10 and the rotating part 20. When the main bearing structure of the shield machine is working, the fixed part 10 is fixed and does not rotate, and the rotating part 20 rotates circumferentially relative to the fixed part 10 under the drive of the power mechanism, thereby driving the cutter head connected to the rotating part 20 to rotate.

[0040] According to one embodiment of the present utility model, Figure 1 As shown, the fixing member 10 includes a first outer ring 11 and a second outer ring 12 connected together along the axial direction B of the shield machine main bearing structure, and the rotating member 20 is clamped between the first outer ring 11 and the second outer ring 12. The first outer ring 11 and the second outer ring 12 are both annular components, and the two are connected together by screws 70; the cross-sections of the first outer ring 11 and the second outer ring 12 are both "L"-shaped, and an annular groove is formed between the first outer ring 11 and the second outer ring 12 that are butt-jointed, and the rotating member 20 is clamped in the annular groove.

[0041] Further, such as Figure 1As shown, the rotating member 20 includes an inner ring 21 and a gear ring 22 connected along the radial direction A of the shield machine main bearing structure, and the gear ring 22 is located radially inside the inner ring 21. The inner ring 21 and the gear ring 22 are both annular components, and the two are connected together by screws 70; the inner ring 21 located on the radial outside is clamped between the first outer ring 11 and the second outer ring 12, and the inner side surface of the gear ring 22 located on the radial inside has gear teeth meshing with the driving gear.

[0042] According to one embodiment of the present utility model, Figure 1 and Figure 2 As shown, the front end face of the second outer ring 12 and the rear end face of the inner ring 21 are arranged opposite to each other along the axial direction B of the shield machine main bearing structure and a first annular cavity 41 is formed therebetween. The first main thrust roller 40 is located in the first annular cavity 41 .

[0043] Specifically, a main thrust cage 62 is provided in the first annular cavity 41, and the first main thrust roller 40 is provided in the main thrust cage 62. The first main thrust roller 40 rolls on the front end face of the second outer ring 12 and the rear end face of the inner ring 21. The rotation axis direction C of the first main thrust roller 40 is perpendicular to the axial direction B of the shield machine main bearing structure, and the revolution axis direction D of the circumferential rotation of the first main thrust roller 40 is parallel to the axial direction B of the shield machine main bearing structure.

[0044] In this embodiment, if Figure 1 As shown, the first main push roller 40 arranged in the first annular cavity 41 is a double-row roller structure to increase the contact area between the first main push roller 40 and the front end face of the second outer ring 12 and the rear end face of the inner ring 21, thereby increasing the bearing capacity of the main bearing structure of the shield machine; of course, in other embodiments of the utility model, the first main push roller 40 can also be arranged as a single-row structure according to actual needs.

[0045] According to one embodiment of the present utility model, Figure 2 As shown, the annular runway 31 on the roller module 30 is detachably connected to the radial inner side of the second outer ring 12, the front end face of the annular runway 31 and the rear end face of the gear ring 22 are arranged relatively to each other along the axial direction B of the main bearing structure of the shield machine and a second annular cavity 42 is formed therebetween, and the second main push roller 32 is located in the second annular cavity 42.

[0046] Specifically, Figure 2As shown, the annular runway 31 is an annular component, which is detachably mounted on the radial inner side of the second outer ring 12 by means of screws 70; in the present embodiment, the thickness of the annular runway 31 is the same as the thickness of the second outer ring 12, and the annular runway 31 is connected to the second outer ring 12, which is equivalent to increasing the radial dimension of the second outer ring 12, thereby forming more accommodating space between the rotating member 20 (inner ring 21 and gear ring 22) and the second outer ring 12, and the bearing capacity of the main bearing structure of the shield machine is improved by arranging the second main push roller 32 in the increased accommodating space.

[0047] Further, such as Figure 2 As shown, the annular track 31 connected to the second outer ring 12 is axially arranged opposite to the gear ring 22, and a second annular cavity 42 is formed between the front end surface of the annular track 31 and the rear end surface of the gear ring 22, and the second main push roller 32 is arranged in the second annular cavity 42.

[0048] Specifically, a main thrust retainer 62 is provided in the second annular cavity 42, and a second main thrust roller 32 is provided in the retainer. The second main thrust roller 32 rolls on the front end surface of the annular runway 31 and the rear end surface of the gear ring 22. The rotation axis direction C of the second main thrust roller 32 is perpendicular to the axial direction B of the shield machine main bearing structure, and the revolution axis direction D of the circumferential rotation of the second main thrust roller 32 is parallel to the axial direction B of the shield machine main bearing structure.

[0049] In this embodiment, if Figure 1 As shown, the second main push roller 32 arranged in the second annular cavity 42 is a double-row roller structure to increase the contact area between the second main push roller 32 and the front end surface of the annular runway 31 and the rear end surface of the gear ring 22, thereby increasing the bearing capacity of the main bearing structure of the shield machine; of course, in other embodiments of the utility model, the second main push roller 32 can also be arranged as a single-row structure according to actual needs.

[0050] According to one embodiment of the present utility model, Figure 2 As shown, the inner ring 21 has a first convex ring 50 facing the second outer ring 12, and the first annular cavity 41 and the second annular cavity 42 are arranged at intervals by the first convex ring 50. The first convex ring 50 is located on the rear end surface of the inner ring 21 and is convexly arranged in the opposite direction to the tunneling direction of the shield machine. On the one hand, the first convex ring 50 can play a certain sealing role on the first annular cavity 41 to prevent the first main push roller 40 from shifting in the first annular cavity 41, and on the other hand, it can play a role in separating the first annular cavity 41 and the second annular cavity 42.

[0051] In other embodiments of the present invention, the first convex ring 50 may be located on the front end surface of the second outer ring 12 and convexly provided along the tunneling direction of the shield machine (convexly provided toward the inner ring 21 ), which may also play a role of sealing and separation.

[0052] Furthermore, the annular runway 31 has a second convex ring 51 facing the rotating member 20. The second convex ring 51 is located on the front end surface of the annular runway 31 and is convexly arranged along the excavation direction of the shield machine. The second convex ring 51 can play a certain sealing role to prevent the second main push roller 32 from shifting in the second annular cavity 42.

[0053] According to one embodiment of the utility model, a plurality of roller modules 30 are provided on the main bearing structure of the shield machine, and a plurality of annular tracks 31 of the plurality of roller modules 30 are sequentially connected along the radial direction A of the main bearing structure of the shield machine, and a second annular cavity 42 is formed between each annular track 31 and the rotating member 20. The plurality of roller modules 30 are sequentially connected along the radial direction A of the main bearing structure of the shield machine, which can further increase the bearing capacity of the main bearing structure of the shield machine.

[0054] Specifically, in Figure 2 On the basis of the structure shown, in order to further increase the bearing capacity of the shield machine main bearing structure, at least one roller module 30 can be connected to the radial inner side of the roller module 30. Along the radial direction A of the shield machine main bearing structure, multiple annular tracks 31 are connected in sequence by bolts, further increasing the radial size of the second outer ring 12, and multiple groups of second main push rollers 32 are arranged in the further increased accommodation space to further improve the bearing capacity of the shield machine main bearing structure. Accordingly, when the roller module 30 is added to the radial inner side of the second outer ring 12, the gear ring 22 needs to be replaced with a gear ring 22 with a larger radial size, and then multiple second annular cavities 42 are formed between the gear ring 22 and the annular track 31, and each second annular cavity 42 is installed with a second main push roller 32; the second annular cavities 42 adjacent to each other are arranged at intervals by the second convex ring 51 on the annular track 31.

[0055] According to one embodiment of the present utility model, Figure 2 As shown, the inner side surface of the first outer ring 11 and the outer side surface of the inner ring 21 are arranged opposite to each other along the radial direction A of the shield machine main bearing structure, and a radial roller 60 is arranged between the two. The rotation axis direction E of the radial roller 60 is parallel to the axial direction B of the shield machine main bearing structure, and the revolution axis direction F of the circumferential rotation of the radial roller 60 is parallel to the axial direction B of the shield machine main bearing structure. The arrangement of the radial roller 60 improves the stability of the relative rotation between the fixed part 10 and the rotating part 20.

[0056] Further, such as Figure 2 As shown, a radial retainer 63 is disposed outside the radial roller 60, and the radial retainer 63 is located between the first outer ring 11 and the inner ring 21. The radial retainer 63 is used to position the radial roller 60, ensuring that the radial roller 60 is always located between the first outer ring 11 and the inner ring 21.

[0057] According to one embodiment of the present utility model, Figure 2 As shown, the rear end face of the first outer ring 11 and the front end face of the inner ring 21 are arranged opposite to each other along the axial direction B of the shield machine main bearing structure, and an auxiliary thrust roller 61 is arranged between the two. The rotation axis direction G of the auxiliary thrust roller 61 is perpendicular to the axial direction B of the shield machine main bearing structure, and the revolution axis direction H of the circumferential rotation of the auxiliary thrust roller 61 is parallel to the axial direction B of the shield machine main bearing structure. The relative rotation stability between the fixed part 10 and the rotating part 20 is further improved by the arrangement of the auxiliary thrust roller 61.

[0058] Furthermore, an auxiliary thrust retainer 64 is disposed outside the auxiliary thrust roller 61 and is located between the first outer ring 11 and the inner ring 21. The auxiliary thrust retainer 64 is used to position the auxiliary thrust roller 61, ensuring that the auxiliary thrust roller 61 is always located between the first outer ring 11 and the inner ring 21.

[0059] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only a specific embodiment of the utility model and is not intended to limit the scope of protection of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the scope of protection of the utility model.

Claims

1. A shield machine main bearing structure, characterized in that: The invention comprises a fixed part (10) and a rotating part (20) which are rotatably sleeved together, wherein a first main thrust roller (40) is arranged between the fixed part (10) and the rotating part (20); the main bearing structure of the shield machine also comprises at least one roller module (30) capable of improving its bearing capacity, wherein the roller module (30) comprises an annular track (31) and a second main thrust roller (32) arranged between the annular track (31) and the rotating part (20), wherein the annular track (31) is detachably connected to the radial inner side of the fixed part (10), and the second main thrust roller (32) and the first main thrust roller (40) are arranged at intervals along the radial direction (A) of the main bearing structure of the shield machine.

2. The shield machine main bearing structure according to claim 1, characterized in that: The fixing member (10) comprises a first outer ring (11) and a second outer ring (12) connected along an axial direction (B) of the main bearing structure of the shield machine, and the rotating member (20) is clamped between the first outer ring (11) and the second outer ring (12).

3. The shield machine main bearing structure according to claim 2, characterized in that: The front end face of the second outer ring (12) and the rear end face of the rotating member (20) are arranged relative to each other along the axial direction (B) of the main bearing structure of the shield machine, and a first annular cavity (41) is formed therebetween, and the first main thrust roller (40) is located in the first annular cavity (41).

4. The shield machine main bearing structure according to claim 3, characterized in that: The rotating member (20) comprises an inner ring (21) and a gear ring (22) connected along a radial direction (A) of the main bearing structure of the shield machine, the gear ring (22) is located radially inside the inner ring (21), and the first annular cavity (41) is located between the second outer ring (12) and the inner ring (21).

5. The shield machine main bearing structure according to claim 4, characterized in that: The annular runway (31) is detachably connected to the radial inner side of the second outer ring (12); the front end face of the annular runway (31) and the rear end face of the gear ring (22) are arranged relative to each other along the axial direction (B) of the main bearing structure of the shield machine, and a second annular cavity (42) is formed therebetween; the second main thrust roller (32) is located in the second annular cavity (42).

6. The shield machine main bearing structure according to claim 5, characterized in that: The inner ring (21) has a first convex ring (50) facing the second outer ring (12), and the first annular cavity (41) and the second annular cavity (42) are spaced apart by the first convex ring (50).

7. The shield machine main bearing structure according to claim 1, characterized in that: A plurality of roller modules (30) are provided on the main bearing structure of the shield machine, and a plurality of annular tracks (31) of the plurality of roller modules (30) are sequentially connected along a radial direction (A) of the main bearing structure of the shield machine, and a second annular cavity (42) is formed between each of the annular tracks (31) and the rotating member (20).

8. The shield machine main bearing structure according to claim 7, characterized in that: The annular raceway (31) has a second convex ring (51) facing the rotating member (20), and two adjacent second annular cavities (42) are spaced apart by the second convex ring (51).

9. The shield machine main bearing structure according to claim 5, characterized in that: A main thrust retaining frame (62) is provided in each of the first annular cavity (41) and the second annular cavity (42), and the first main thrust roller (40) and the second main thrust roller (32) are respectively arranged in the retaining frame.

10. The shield machine main bearing structure according to claim 1, characterized in that: The rotation axis direction of the first main thrust roller (40) and the rotation axis direction of the second main thrust roller (32) are respectively perpendicular to the axial direction (B) of the main bearing structure of the shield machine, and the revolution axis direction of the circumferential rotation of the first main thrust roller (40) and the revolution axis direction of the circumferential rotation of the second main thrust roller (32) are respectively parallel to the axial direction (B) of the main bearing structure of the shield machine.

11. The shield machine main bearing structure according to claim 4, characterized in that: The inner side surface of the first outer ring (11) and the outer side surface of the inner ring (21) are arranged opposite to each other along the radial direction (A) of the main bearing structure of the shield machine, and a radial roller (60) is arranged between the two. The rotation axis direction of the radial roller (60) is parallel to the axial direction (B) of the main bearing structure of the shield machine, and the revolution axis direction of the circumferential rotation of the radial roller (60) is parallel to the axial direction (B) of the main bearing structure of the shield machine.

12. The shield machine main bearing structure according to claim 11, characterized in that: A radial retainer (63) is disposed outside the radial roller (60), and the radial retainer (63) is located between the first outer ring (11) and the inner ring (21).

13. The shield machine main bearing structure according to claim 4 or 11, characterized in that: The rear end face of the first outer ring (11) and the front end face of the inner ring (21) are arranged relative to each other along the axial direction (B) of the main bearing structure of the shield machine, and an auxiliary thrust roller (61) is arranged between the two. The rotation axis direction of the auxiliary thrust roller (61) is perpendicular to the axial direction (B) of the main bearing structure of the shield machine, and the revolution axis direction of the circumferential rotation of the auxiliary thrust roller (61) is parallel to the axial direction (B) of the main bearing structure of the shield machine.

14. The shield machine main bearing structure according to claim 13, characterized in that: An auxiliary thrust retainer (64) is arranged outside the auxiliary thrust roller (61), and the auxiliary thrust retainer (64) is located between the first outer ring (11) and the inner ring (21).

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