Shield main bearing structure

Abstract

The utility model relates to a shield main bearing structure. The shield main bearing structure comprises a main bearing inner ring and a main bearing outer ring, the main bearing outer ring is rotatably arranged on the periphery of the main bearing inner ring in a sleeving mode in the circumferential direction of the main bearing inner ring, and at least one roller is arranged between the main bearing outer ring and the main bearing inner ring; the auxiliary pushing sliding block is located on one side of the main bearing inner ring, the auxiliary pushing sliding block at least can move between a first position and a second position, and when the auxiliary pushing sliding block is located at the first position, the auxiliary pushing sliding block is separated from the main bearing outer ring; and when the auxiliary pushing sliding block moves to the second position, at least part of the outer wall of the auxiliary pushing sliding block is in sliding contact with the outer ring of the main bearing. The main bearing solves the technical problem that a rolling bearing and a sliding bearing cannot be combined for use, so that the main bearing of the shield tunneling machine cannot keep light weight while improving the bearing capacity.

Description

TECHNICAL FIELD

[0001] The utility model relates to a tunnel construction technical field further relates to a shield main bearing structure especially relates to a rolling, sliding multi -mode set in one's body's shield main bearing knot. BACKGROUND

[0002] The shield machine main bearing is installed in the main drive, and needs to bear the combined action of complex radial load, axial load and overturning moment load when working, and the main machine has high reliability requirements for the shield machine main bearing, once the shield machine main bearing fails, not only the main machine will stop maintenance and bring major economic losses, and even cause safety accidents. For the structure of the shield machine main bearing, generally, the bearing carrying capacity can be improved by increasing the roller diameter, the number and even increasing the overall diameter of the bearing. Of course, the bearing carrying capacity can also be improved by changing the material properties, increasing the depth of the hardened layer and improving the machining precision. But for the working environment of the shield machine main bearing, the strong impact and high stress of the large working condition only appear in a certain time period in the tunneling section, and the sudden strong impact and high stress can easily lead to bearing failure, which has great hidden dangers for the safe operation of the shield machine main bearing. Because the shield machine is in a small working condition environment for most of the time in the long tunneling process (i.e. the impact and stress are relatively stable, and there is no sudden strong impact and high stress), in order to improve the shield machine main bearing in the traditional way for a short time, the overall structure carrying capacity is increased, which can lead to the increase of the design and production cost of the shield machine main bearing, and the weight is also increased.

[0003] Because the shield machine main bearing cannot be replaced during operation, the maintenance cost of the shield machine main bearing after damage is high, so it is particularly important to select a suitable shield machine main bearing. For the current bearing characteristics: the rolling bearing has small carrying capacity, small friction in the running process, small starting torque and smooth running, and is suitable for small working condition; the carrying capacity of the sliding bearing is much larger than that of the rolling bearing, but the friction (i.e. resistance) in the running process is larger, and the wear is also larger, which is suitable for large working condition (i.e. short time, strong impact and high stress), but how to combine the rolling bearing with the sliding bearing so that the shield machine main bearing can have the characteristics of both to meet the needs of different working conditions of the shield machine is still to be solved.

[0004] For the problem that the rolling bearing and the sliding bearing cannot be used together in the related art, the shield machine main bearing cannot improve the carrying capacity while maintaining the light weight, and the problem has not been solved.

[0005] Therefore, the utility model provides a shield main bearing structure to overcome the defects of the prior art. UTILITY MODEL CONTENT

[0006] The shield main bearing structure combines rolling bearings and sliding bearings, and adapts to corresponding bearing modes according to different working conditions, thereby improving the load capacity of the shield machine main bearing while maintaining light weight.

[0007] The purpose of the utility model can be realized by the following scheme:

[0008] The utility model provides a kind of shield main bearing structure, and the shield main bearing structure includes:

[0009] Main bearing inner ring;

[0010] Main bearing outer ring, the main bearing outer ring is rotatably sleeved in the outer periphery of the main bearing inner ring along the circumference of the main bearing inner ring, and at least one roller is arranged between the main bearing outer ring and the main bearing inner ring;

[0011] Auxiliary push slider, the auxiliary push slider is located at one side of the main bearing inner ring, and the auxiliary push slider can be moved at least between first position and second position, when the auxiliary push slider is located at the first position, the auxiliary push slider is separated from the main bearing outer ring;When the auxiliary push slider moves to the second position, at least part of the outer wall of the auxiliary push slider and the main bearing outer ring are in sliding contact.

[0012] In a preferred embodiment of the utility model, the number of auxiliary push sliders is multiple, and multiple auxiliary push sliders are distributed along the axial direction of the main bearing outer ring;

[0013] Multiple auxiliary push sliders are independently moved between the first position and the second position.

[0014] In a preferred embodiment of the utility model, the auxiliary push slider is movably arranged on the main bearing inner ring along the radial direction of the main bearing outer ring, the outer wall of the auxiliary push slider has a first inclined surface, and the inner wall of the main bearing outer ring and the position radially opposite to the auxiliary push slider has an annular second inclined surface;

[0015] When the auxiliary push slider moves to the second position, the first inclined surface and the second inclined surface are in sliding fit.

[0016] In a preferred embodiment of the utility model, the included angle between the first inclined surface and the second inclined surface and the horizontal direction is 40° to 50°.

[0017] In a preferred embodiment of the utility model, the shield main bearing structure further includes a connecting flange, the connecting flane is located at one side of the main bearing inner ring and is connected with the main bearing inner ring, a driving element is arranged on the connecting flange, the action end of the driving element is connected with the auxiliary push sliding block to drive the auxiliary push sliding block to move along the radial direction of the main bearing outer ring.

[0018] In a preferred embodiment of the utility model, the driving element is a push oil cylinder, the cylinder body of the push oil cylinder is fixed on the connecting flange, and the end of the piston rod of the push oil cylinder is connected with the auxiliary push sliding block.

[0019] In a preferred embodiment of the utility model, the connecting flange is connected with one end of the main bearing inner ring through bolts.

[0020] In a preferred embodiment of the utility model, a lubricating layer for reducing sliding friction is arranged on the first inclined surface and / or the second inclined surface.

[0021] In a preferred embodiment of the utility model, a plurality of grooves are formed on the first inclined surface and / or the second inclined surface, and the grooves are used for injecting lubricating oil.

[0022] In a preferred embodiment of the utility model, the main bearing outer ring includes a first outer ring and a second outer ring, the first outer ring is connected with the second outer ring and is sleeved on the outer periphery of the main bearing inner ring in cooperation;

[0023] An annular boss is formed on the outer wall of the main bearing inner ring along the circumferential direction, the boss has opposite first and second end faces and an outer peripheral surface between the first and second end faces,

[0024] A first raceway in the form of an annular groove is formed between the inner wall of the first outer ring and the first end face, a first roller is arranged in the first raceway, and the first roller is used for bearing the axial load of the shield main bearing;

[0025] A second raceway in the form of an annular groove is formed between the inner wall of the second outer ring and the second end face, a second roller is arranged in the second raceway, and the second roller is used for bearing a part of the axial load of the shield main bearing and the overturning moment for overturning the shield main bearing;

[0026] A third raceway in the form of an annular groove is formed between the position where the inner wall of the first outer ring and the inner wall of the second outer ring are connected and the outer peripheral surface, and a third roller is arranged in the third raceway, and the third roller is used for bearing the radial load of the shield main bearing.

[0027] In a preferred embodiment of the utility model, the contact area of the first roller with the first end face is larger than the contact area of the second roller with the second end face, so that the first roller is a main pushing roller and the second roller is an auxiliary pushing roller.

[0028] The third roller is a radial roller.

[0029] As described above, the shield main bearing structure has the following characteristics and advantages:

[0030] At least one roller is arranged between the main bearing inner ring and the main bearing outer ring of the shield main bearing structure, so that the shield main bearing structure has the characteristics of a rolling bearing, that is, the main bearing inner ring and the main bearing outer ring have a small friction force when rotating relative to each other, the shield main bearing structure has a small starting torque, and the operation is smoother; the auxiliary pushing block can be moved to a position where at least part of the outer wall thereof is in sliding contact with the main bearing outer ring, so that the auxiliary pushing block and the main bearing outer ring are in sliding contact while the main bearing inner ring and the main bearing outer ring are in rolling contact, that is, the shield main bearing structure has the characteristics of both a rolling bearing and a sliding bearing, so that the corresponding bearing mode can be adapted according to different working conditions, thereby improving the load capacity of the main bearing of the shield tunneling machine while maintaining lightweight. BRIEF DESCRIPTION OF DRAWINGS

[0031] The following drawings are only intended to schematically illustrate and explain the utility model and do not limit the scope of the utility model. Among them:

[0032] Figure 1 It is a partial cross-sectional view of the shield main bearing structure of the utility model;

[0033] Figure 2 It is a partial cross-sectional view of the second outer ring in the shield main bearing structure of the utility model;

[0034] Figure 3 It is a partial cross-sectional view of the auxiliary pushing block in the shield main bearing structure of the utility model;

[0035] Figure 4 It is one of the working state schematic views of the shield main bearing structure of the utility model;

[0036] Figure 5 It is another working state schematic view of the shield main bearing structure of the utility model;

[0037] Figure 6 It is a third working state schematic view of the shield main bearing structure of the utility model.

[0038] In the utility model, the reference signs are:

[0039] 1, main bearing inner ring; 101, boss;

[0040] 2, main bearing outer ring; 201, first outer ring;

[0041] 202, second outer ring; 2021, second inclined surface;

[0042] 3, auxiliary push slider; 301, first inclined surface;

[0043] 302, lubricating layer; 4, connecting flange;

[0044] 5, driving piece; 6, first roller;

[0045] 7, second roller; 8, third roller;

[0046] 9, bolt. DETAILED DESCRIPTION

[0047] The technical scheme of the utility model will be described in detail below with reference to the drawings and specific embodiments, and it should be understood that these embodiments are only used for illustrating the utility model and not for limiting the scope of the utility model, and after reading the utility model, the modification of various equivalent forms of the utility model by those skilled in the art falls within the scope defined by the claims attached to the present application.

[0048] It should be noted that when an element is referred to as "provided on" another element, it can be directly on the other element or there can be a middle element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or there can be a middle element. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0050] As Figures 1 to 6The utility model provides a kind of shield main bearing structure, the shield main bearing structure includes main bearing inner ring 1, main bearing outer ring 2 and auxiliary push slider 3, main bearing inner ring 1 and main bearing outer ring 2 are all annular structure, and the diameter of main bearing outer ring 2 is greater than the diameter of main bearing inner ring 1, in assembly state, main bearing outer ring 2 is rotatably sleeved in the outer periphery of main bearing inner ring 1 along the circumference of main bearing inner ring 1, at least one roller is arranged between the inner wall of main bearing outer ring 2 and the outer wall of main bearing inner ring 1, main bearing outer ring 2, main bearing inner ring 1 and roller cooperate to form rolling bearing structure;Auxiliary push slider 3 is located in one side of main bearing inner ring 1, and auxiliary push slider 3 can at least move between first position and second position, when auxiliary push slider 3 is located in first position, auxiliary push slider 3 is separated from main bearing outer ring 2, at this time, shield main bearing structure only has the characteristics of rolling bearing (i.e. smaller carrying capacity, but smaller friction in running process, smaller starting torque, more smooth running, suitable for small working condition state running);When auxiliary push slider 3 moves to second position, at least part of the outer wall of auxiliary push slider 3 is in sliding contact with main bearing outer ring 2, at this time, shield main bearing structure not only has the characteristics of rolling bearing, but also increases the characteristics of sliding bearing (i.e. has greater carrying capacity, but greater friction in running process, greater wear, suitable for large working condition state running).

[0051] In the utility model, at least one roller is arranged between main bearing inner ring 1 and main bearing outer ring 2 of shield main bearing structure, so that shield main bearing structure has the characteristics of rolling bearing, i.e. smaller friction when main bearing inner ring 1 and main bearing outer ring 2 relatively rotate, shield main bearing structure has smaller starting torque, and running is more smooth;Because auxiliary push slider 3 is arranged in one side of main bearing inner ring 1, auxiliary push slider 3 can move to the position that at least part of its outer wall is in sliding contact with main bearing outer ring 2, while main bearing inner ring 1 and main bearing outer ring 2 are in rolling contact, sliding contact between auxiliary push slider 3 and main bearing outer ring 2 is realized, i.e. shield main bearing structure has the characteristics of rolling bearing and sliding bearing, thus, corresponding bearing mode can be adapted according to different working conditions (i.e. actual stress condition of shield machine main bearing), so as to adjust the carrying capacity of shield main bearing structure, greatly reduce the influence of high carrying capacity working condition of shield main bearing, ensure the safe and stable operation of shield main bearing in various working conditions, improve the carrying capacity of shield machine main bearing while keeping lightweight, so that shield machine main bearing has wider application range.

[0052] In an optional embodiment of the utility model, Figures 4 to 6As shown, the number of auxiliary pushing blocks 3 is multiple, the multiple auxiliary pushing blocks 3 are spaced and uniformly distributed along the axial direction of the main bearing outer ring 2; the multiple auxiliary pushing blocks 3 independently move between the first position and the second position, so that there are auxiliary pushing blocks 3 in sliding contact with the main bearing outer ring 2 in each direction, and in the actual operation process, different numbers and corresponding positions of auxiliary pushing blocks 3 can be selected to move and be in sliding contact with the main bearing outer ring 2 according to different actual working conditions, so as to meet the different bearing capacity requirements of the shield main bearing. Since the shield main bearing needs to bear the axial force, radial force and overturning moment in the tunneling process, in the tunneling process in various complex strata, when in a small working condition (the axial force, radial force and overturning moment borne by the shield machine main bearing are small), such as Figure 4 As shown, the multiple auxiliary pushing blocks 3 can be controlled to be separated from the main bearing outer ring 2, and the shield main bearing of the utility model is consistent with the general main bearing structure in the running state (that is, both are rolling bearing modes); when the shield main bearing is in an eccentric load working condition (that is, the axial force, radial force and overturning moment borne by the shield machine main bearing suddenly increase on one side), such as Figure 5 As shown, one auxiliary pushing block 3 or multiple auxiliary pushing blocks 3 located on the eccentric load side are controlled to move to the position in sliding contact with the main bearing outer ring 2, so as to improve the bearing capacity of the shield main bearing on the corresponding eccentric load position and reduce the damage of the shield main bearing; when the shield main bearing is in an extreme working condition (that is, the axial force, radial force and overturning moment borne by the shield machine main bearing are large or suddenly increase), such as Figure 6 As shown, all of the circumferentially distributed auxiliary pushing blocks 3 are controlled to move to the position in sliding contact with the main bearing outer ring 2, so as to maximally increase the bearing capacity of the shield main bearing as a whole, which can greatly reduce the influence of the high bearing working condition on the shield main bearing and ensure the safe and stable operation of the shield main bearing. In the utility model, for the small working condition, the eccentric load working condition and the large working condition, the construction personnel can set according to the actual situation, so as to ensure that the shield main bearing has stable bearing capacity by controlling the auxiliary pushing blocks 3 in different working conditions.

[0053] In an optional embodiment of the utility model, as shown in Figures 1 to 6As shown, the auxiliary pushing block 3 is arranged on the main bearing inner ring 1 and can move in the radial direction of the main bearing outer ring 2, the outer wall of the auxiliary pushing block 3 is provided with a first inclined surface 301, the inner wall of the main bearing outer ring 2 and the position radially opposite to the auxiliary pushing block 3 is provided with an annular second inclined surface 2021, the inclination angle of the first inclined surface 301 is the same as the inclination angle of the second inclined surface 2021; when the auxiliary pushing block 3 moves to the second position, the first inclined surface 301 and the second inclined surface 2021 are in sliding fit, so that the auxiliary pushing block 3 and the main bearing outer ring 2 can be fully contacted, and the load capacity of the main bearing of the shield machine can be improved as much as possible. The first inclined surface 301 and the second inclined surface 2021 can be inclined straight surfaces or inclined curved surfaces, and when the first inclined surface 301 and the second inclined surface 2021 are both inclined curved surfaces, the sliding contact area of the first inclined surface 301 and the second inclined surface 2021 can be further increased, so that the load capacity of the main bearing of the shield machine can be further improved.

[0054] Further, as shown in Figure 2 and Figure 3 , when the main bearing of the shield machine extends in the horizontal direction along the axial direction, the included angle β between the first inclined surface 301 and the second inclined surface 2021 and the horizontal direction is 40° to 50°, so that the first inclined surface 301 and the second inclined surface 2021 can be uniformly stressed when they are in sliding contact, and the load of the inclined surface can be uniformly borne. Preferably, the included angle β between the first inclined surface 301 and the second inclined surface 2021 and the horizontal direction is 45°.

[0055] In an optional embodiment of the present application, as shown in Figure 1 , Figures 4 to 6 , the main bearing structure of the shield machine further comprises a connecting flange 4 in the shape of a ring, the connecting flange 4 is located on one side of the main bearing inner ring 1 and connected with the main bearing inner ring 1, the connecting flange 4 is provided with a driving member 5 on the side of the inner wall of the main bearing outer ring 2, the driving member 5 is connected with the auxiliary pushing block 3 through the action end, and the auxiliary pushing block 3 is driven to move in the radial direction of the main bearing outer ring 2 by the driving member 5, so as to control the sliding contact or separation of the auxiliary pushing block 3 and the inner wall of the main bearing outer ring 2.

[0056] In the present embodiment, as shown in Figure 1 , Figures 4 to 6 , the driving member 5 can be a push oil cylinder, the cylinder body of the push oil cylinder is fixed on the connecting flange 4, the piston rod of the push oil cylinder extends in the radial direction of the main bearing of the shield machine and the end of the piston rod is connected with the auxiliary pushing block 3, so that the auxiliary pushing block 3 can be driven to move in the radial direction of the main bearing of the shield machine by controlling the extension and retraction of the piston rod. Of course, other driving members 5 (such as telescopic structures) can also be used, which can drive the auxiliary pushing block 3 to move in the radial direction of the main bearing of the shield machine, and the driving structure and driving mode of the driving member 5 are not limited herein.

[0057] In a specific embodiment of the present application, as shown inFigure 1 , Figures 4 to 6 As shown, the connecting flange 4 is connected to one end of the inner ring 1 of the main bearing via bolts 9. By adjusting the length of the bolts 9 screwed into the inner ring 1 of the main bearing, the relative position of the connecting flange 4 and the inner ring 1 of the main bearing in the axial direction of the shield machine's main bearing can be adjusted. This allows for adjustment of the sliding contact area between the first inclined surface 301 and the second inclined surface 2021 when the auxiliary pusher slider 3 slides against the outer ring 2 of the main bearing, thereby adjusting the load-bearing capacity of the shield machine's main bearing. Specifically, the longer the adjusting bolts 9 are screwed into the inner ring 1 of the main bearing, the closer the relative position of the connecting flange 4 and the inner ring 1 of the main bearing in the axial direction of the shield machine's main bearing, and the larger the sliding contact area between the first inclined surface 301 and the second inclined surface 2021. Conversely, the shorter the length of the adjusting bolts 9 are screwed into the inner ring 1 of the main bearing, the farther the relative position of the connecting flange 4 and the inner ring 1 of the main bearing in the axial direction of the shield machine's main bearing, and the smaller the sliding contact area between the first inclined surface 301 and the second inclined surface 2021.

[0058] In one optional embodiment of this utility model, such as Figure 3 As shown, a lubricating layer 302 for reducing sliding friction is provided on the first inclined surface 301. The lubricating layer 302 reduces the sliding friction between the first inclined surface 301 and the second inclined surface 2021, lowering the coefficient of friction. This reduces sliding wear between the auxiliary push slider 3 and the outer ring 2 of the main bearing, extending their service life. Alternatively, the lubricating layer 302 can also be provided on the second inclined surface 2021 of the outer ring 2 of the main bearing, or simultaneously on both the first inclined surface 301 of the auxiliary push slider 3 and the second inclined surface 2021 of the outer ring 2 of the main bearing. The lubricating layer 302 may be made of, but is not limited to, polytetrafluoroethylene (PTFE).

[0059] In another optional embodiment of this utility model, multiple channels can be opened on the first inclined surface 301 and / or the second inclined surface 2021. Lubricating oil is injected into the multiple channels. The lubricating oil in the channels wets the first inclined surface 301 and the second inclined surface 2021, which can also reduce the sliding friction and reduce the coefficient of friction, thereby reducing the sliding wear between the auxiliary push slider 3 and the outer ring 2 of the main bearing.

[0060] In one optional embodiment of this utility model, such as Figures 1 to 6As shown, the main bearing outer ring 2 comprises a circular ring-shaped first outer ring 201 and a circular ring-shaped second outer ring 202, the first outer ring 201 is connected with the second outer ring 202 and is sleeved on the outer periphery of the main bearing inner ring 1; the outer wall of the main bearing inner ring 1 is formed with a circular ring-shaped boss 101 along the circumferential direction, the boss 101 has an axially opposite first end face and a second end face and an outer peripheral surface between the first end face and the second end face, a circular ring-shaped first raceway is formed between the inner wall of the first outer ring 201 and the first end face, and a first roller 6 is arranged in the first raceway; a circular ring-shaped second raceway is formed between the inner wall of the second outer ring 202 and the second end face, and a second roller 7 is arranged in the second raceway, since the contact area of the first roller 6 with the first end face is greater than the contact area of the second roller 7 with the second end face, the first roller 6 is a main thrust roller, and the second roller 7 is an auxiliary thrust roller, the first roller 6 is used for bearing the axial load of the main bearing of the shield, and the second roller 7 is used for bearing part of the axial load of the main bearing of the shield and the overturning moment for overturning the main bearing of the shield.

[0061] In an optional embodiment of the utility model, as shown in Figures 1 to 6 As shown, a circular ring-shaped third raceway is formed between the connecting position of the inner wall of the first outer ring 201 and the inner wall of the second outer ring 202 and the outer peripheral surface, a third roller 8 is arranged in the third raceway, the third roller 8 is a radial roller, and the third roller 8 is used for bearing the radial load of the main bearing of the shield.

[0062] The utility model discloses in actual working process, can switch the sliding contact state between auxiliary push slider 3 and main bearing outer ring 2 in shield main bearing at any time according to different strata, when being in small working condition (the axial force, radial force and overturning moment of shield machine main bearing is smaller), the control multiple auxiliary push slider 3 is separated with main bearing outer ring 2, at this moment, shield main bearing and general main bearing structure operating state are consistent, and all are pure rolling bearing mode, when shield main bearing is in partial load working condition (namely the axial force, radial force and overturning moment of shield machine main bearing only one side appears suddenly increased condition), then control one auxiliary push slider 3 or multiple auxiliary push slider 3 in partial load side moves to the position of sliding contact with main bearing outer ring 2, at this moment, it is rolling bearing mode and partial sliding bearing mode cooperation, improve the carrying capacity of shield main bearing on corresponding partial load position, reduce the damage of shield main bearing, when shield main bearing is in limit working condition (namely the axial force, radial force and overturning moment of shield machine main bearing is larger, or suddenly increases), then control all auxiliary push slider 3 of circumferential distribution moves to the position of sliding contact with main bearing outer ring 2, at this moment, it is rolling bearing mode and all sliding bearing mode cooperation, the carrying capacity of shield main bearing is maximized (the circumferential one circle of main bearing outer ring 2 is all surface-to-surface sliding contact), can greatly reduce the influence of shield main bearing due to high carrying condition under this working condition, guarantee the safe, stable operation of shield main bearing, simultaneously, the internal structure of shield main bearing is protected, but friction resistance is larger at this moment, is not suitable for long time operation, therefore, the utility model discloses on first slope 301 And / or second slope 2021 Set up lubricating layer 302, reach the sliding friction force of reducing, the purpose of reducing the friction coefficient, avoid the abrasion of sliding surface easily caused by too large friction resistance.

[0063] The shield main bearing structure has the following characteristics and advantages:

[0064] I. The shield main bearing structure can have the characteristics of rolling bearing and sliding bearing simultaneously, and thus can adapt to the corresponding bearing mode according to different working conditions, so as to adjust the carrying capacity of the shield main bearing structure, greatly reduce the influence of the shield main bearing due to high carrying condition, ensure the safe and stable operation of the shield main bearing under various working conditions, improve the carrying capacity of the shield machine main bearing while keeping lightweight, and make the shield machine main bearing have a wider application range.

[0065] II. The shield main bearing structure can bear axial force, radial force and overturning moment in the process of tunneling, and in various complex strata and in small working condition tunneling environment, the shield main bearing structure and the general main bearing structure are consistent in operation state (i.e. both are rolling bearing mode); when in partial load working condition, one auxiliary pushing block 3 or multiple auxiliary pushing blocks 3 located in the partial load side are controlled to move to the position of sliding contact with the main bearing outer ring 2, thereby improving the carrying capacity of the shield main bearing at the corresponding partial load position and reducing the damage of the shield main bearing; when in extreme working condition environment, all auxiliary pushing blocks 3 distributed in the circumferential direction are controlled to move to the position of sliding contact with the main bearing outer ring 2, thereby increasing the carrying capacity of the shield main bearing to the greatest extent as a whole, which can greatly reduce the influence of high carrying capacity of the shield main bearing and ensure the safe and stable operation of the shield main bearing.

[0066] It should be noted that in the description of the present application, the terms "first", "second" and the like are only used for descriptive purposes and to distinguish similar objects, and there is no prior and posterior order between them, nor can it be understood as indicating or implying relative importance. In addition, in the description of the present application, unless otherwise stated, the meaning of "multiple" is two or more.

[0067] The above various embodiments in the specification are described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment mainly explains the difference from other embodiments.

[0068] The above is only a few embodiments of the present application, although the embodiments disclosed by the present application are as above, but the content is only for the purpose of understanding the present application and the adopted embodiment, and is not used to limit the present application. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principle of the present application shall fall within the scope of protection of the present application.

Claims

1. A shield main bearing structure, characterized by, The shield main bearing structure comprises: a main bearing inner ring; a main bearing outer ring, which is rotatably sleeved on the outer periphery of the main bearing inner ring along the circumferential direction of the main bearing inner ring, and at least one roller is arranged between the main bearing outer ring and the main bearing inner ring; an auxiliary push block, which is located on one side of the main bearing inner ring and can move between at least a first position and a second position, when the auxiliary push block is located at the first position, the auxiliary push block is separated from the main bearing outer ring, and when the auxiliary push block moves to the second position, at least part of the outer wall of the auxiliary push block is in sliding contact with the main bearing outer ring.

2. The shield main bearing structure according to claim 1, wherein The number of auxiliary push blocks is multiple, and the multiple auxiliary push blocks are distributed along the axial direction of the main bearing outer ring; The multiple auxiliary push blocks independently move between the first position and the second position.

3. The shield main bearing structure according to claim 1 or 2, characterized in that, The auxiliary push block is movably arranged on the main bearing inner ring along the radial direction of the main bearing outer ring, the outer wall of the auxiliary push block has a first inclined surface, and the inner wall of the main bearing outer ring and the position radially opposite to the auxiliary push block has an annular second inclined surface; When the auxiliary push block moves to the second position, the first inclined surface and the second inclined surface are in sliding fit.

4. The shield main bearing structure according to claim 3, wherein The included angle between the first inclined surface and the second inclined surface and the horizontal direction is 40° to 50°.

5. The shield main bearing structure according to claim 3, wherein The shield main bearing structure further comprises a connecting flange, which is located on one side of the main bearing inner ring and connected with the main bearing inner ring, and a driving member is arranged on the connecting flange, the action end of the driving member is connected with the auxiliary push block, so as to drive the auxiliary push block to move along the radial direction of the main bearing outer ring.

6. The shield main bearing structure according to claim 5, wherein The driving member is a push oil cylinder, the cylinder body of the push oil cylinder is fixed on the connecting flange, and the end of the piston rod of the push oil cylinder is connected with the auxiliary push block.

7. The shield main bearing structure according to claim 5, wherein The connecting flange is connected with one end of the main bearing inner ring through bolts.

8. The shield main bearing structure according to claim 3, wherein A lubricating layer for reducing sliding friction is arranged on the first inclined surface and / or the second inclined surface.

9. The shield main bearing structure according to claim 3, wherein A plurality of grooves are formed on the first inclined surface and / or the second inclined surface, and lubricating oil is injected into the grooves.

10. The shield main bearing structure according to claim 1, wherein The main bearing outer ring comprises a first outer ring and a second outer ring, the first outer ring is connected with the second outer ring and is sleeved on the outer periphery of the main bearing inner ring; An annular boss is formed on the outer wall of the main bearing inner ring along the circumferential direction thereof, the boss has opposite first and second end faces and an outer peripheral surface between the first and second end faces, An annular first raceway is formed between the inner wall of the first outer ring and the first end face, and a first roller is arranged in the first raceway, the first roller is used to bear the axial load of the shield main bearing; An annular second raceway is formed between the inner wall of the second outer ring and the second end face, and a second roller is arranged in the second raceway, the second roller is used to bear part of the axial load of the shield main bearing and the overturning moment for overturning the shield main bearing; An annular third raceway is formed between the connecting position of the inner wall of the first outer ring and the inner wall of the second outer ring and the outer peripheral surface, and a third roller is arranged in the third raceway, and the third roller is used for bearing the radial load of the main bearing of the shield.

11. The shield main bearing structure according to claim 10, wherein The contact area of the first roller and the first end face is greater than the contact area of the second roller and the second end face, so that the first roller is a main pushing roller, and the second roller is an auxiliary pushing roller. The third roller is a radial roller.

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