Tunnel boring machine main bearing

Abstract

The present invention relates to a main bearing for a tunnel boring machine, comprising an outer ring structure and an inner ring structure, with rolling elements disposed therebetween. A retaining cage structure is disposed within the outer ring structure. A stress nondestructive testing probe is disposed on the retaining cage structure, capable of directly contacting the non-load-bearing surface of the rolling elements to detect rolling element stress. The stress nondestructive testing probe is electrically connected to a stress monitoring integrated module, which receives probe detection signals, processes and stores data, and provides ultrasonic energy to the stress nondestructive testing probe. The stress monitoring integrated module also receives external operating command signals and provides external feedback on rolling element stress data. The present invention can monitor the stress parameters of the main bearing rollers in real time while the tunnel boring machine is in service, determining the forces acting on the rollers. This timely feedback prevents damage to the main bearing caused by transient overload during tunneling. The stress nondestructive testing probe directly contacts the rollers, resulting in high stress monitoring accuracy and a simple monitoring module structure.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering machinery, and in particular to a main bearing of a tunnel boring machine. Background Art

[0002] The main drive bearing is a critical component of large-scale tunnel boring machines. During operation, it is subjected to axial and radial loads, overturning moments, and transient high impacts. Therefore, the bearing's load-bearing capacity is a key consideration during the design process. While theoretical analysis and simulation are used to calculate the load strength and roller stress during the design phase, direct data on the stresses between the rollers and raceways during actual tunneling is currently unavailable. This paper proposes a bearing that can monitor roller stresses online and in real time during service.

[0003] Patent CN214742761U proposes an intelligent bearing with condition monitoring function, which has a self-generating function and an integrated composite sensor for monitoring vibration and temperature signals, but does not have the function of monitoring the force on the rolling element;

[0004] Patent CN214837878U discloses a self-powered monitoring rolling bearing. It uses coils, coil windings, and magnets to make them rotate relative to each other, thereby cutting magnetic flux lines to generate electricity to power a monitoring module and monitor the operating status of the bearing. However, it cannot sense the force applied to the rollers.

[0005] CN103711801A proposes a bearing assembly for a roadheader cutter with a composite sensor. Acceleration, velocity, and temperature sensors are integrated and rationally arranged to monitor bearing signals without damaging the bearing integrity or generating stress concentration. However, roller stress monitoring is also not mentioned.

[0006] CN113607317A proposes an indirect measurement method and system for raceway contact stress, which sets a mark point on the inner ring, uses a wireless strain gauge to collect the strain magnitude in the placement direction of the resistance strain gauge at the measurement mark point, and simulates the strain of the bearing inner ring measurement mark point and the raceway contact stress under different roller loads through finite element simulation. To a certain extent, it can reflect the raceway contact stress. However, due to the slight deformation of the bearing, the collected signal accuracy is poor; and the signal needs to be transmitted through multiple channels, and the accumulated error causes the final output signal to be significantly different from the actual signal. Therefore, this method has poor measurement accuracy.

[0007] CN103411712B discloses a contact stress sensor. By adopting a flexible support base, a flexible transmission line and a flexible medium, the contact stress sensor can bend and deform according to the installation environment. The sensor is suitable for measuring the contact stress of the upper and lower contact surfaces of objects located in a curved surface structure. However, the sensor needs to be installed on the stress-bearing surface and cannot be applied to contact surfaces with high rigidity requirements. For the main bearing raceway, if this sensor is used, it will inevitably lead to a significant decrease in the bearing's load-bearing capacity and shorten its practical life.

[0008] Therefore, the inventor, relying on years of experience and practice in related industries, proposes a main bearing for a tunnel boring machine to overcome the defects of the prior art. Summary of the Invention

[0009] The purpose of the present invention is to provide a main bearing for a tunnel boring machine, which can monitor the stress parameters of the main bearing rollers in real time when the tunnel boring machine is in service to determine the force acting on the bearing rollers. Through timely feedback, the tunnel boring parameters can be adjusted in a targeted manner to prevent damage to the main bearing caused by instantaneous overload during tunnel boring. The stress non-destructive testing probe is in direct contact with the rollers, the stress monitoring accuracy is high, and the monitoring module structure is simple.

[0010] The objective of the present invention is achieved in this way: a main bearing of a tunnel boring machine includes an outer ring structure and an inner ring structure, a rolling body is arranged between the outer ring structure and the inner ring structure, and a retaining frame structure for supporting and positioning the rolling body is provided in the outer ring structure; a stress non-destructive detection probe is movably provided on the retaining frame structure, and the stress non-destructive detection probe can directly contact the non-bearing surface of the rolling body to detect the stress of the rolling body; the stress non-destructive detection probe is electrically connected to a stress monitoring integrated module, and the stress monitoring integrated module can receive probe detection signals, process data, store data, and can power the stress non-destructive detection probe and provide ultrasonic energy. The stress monitoring integrated module can also receive external operation command signals and feedback rolling body stress data to the outside world.

[0011] In a preferred embodiment of the present invention, the stress monitoring integrated module includes an electrical energy storage module, a data processing module, a signal and data receiving module, and a data storage module.

[0012] In a preferred embodiment of the present invention, a signal and data transmission module is also provided in the outer ring structure, and the signal and data transmission module can be electrically connected to an external computer; the signal and data transmission module is used to transmit signals and data between the stress monitoring integrated module and the external computer.

[0013] In a preferred embodiment of the present invention, a probe coil is provided at one end of the stress non-destructive testing probe, and the probe coil generates magnetic force when energized to cause the stress non-destructive testing probe to be adsorbed on the end surface of the rolling element.

[0014] In a preferred embodiment of the present invention, a permanent magnet block is provided on the retaining frame structure, and an adsorption end face is provided at the other end of the stress nondestructive testing probe. The permanent magnet block can adsorb the adsorption end face by magnetic force to separate the stress nondestructive testing probe from the rolling element; the magnetic force of the permanent magnet block on the adsorption end face is smaller than the magnetic force generated by the probe coil when energized.

[0015] In a preferred embodiment of the present invention, the stress monitoring integrated module and the stress nondestructive testing probe are electrically connected through a probe data transmission line; the signal and data transmission module is electrically connected to an external computer through a signal data transmission line, and a line channel for passing through the signal data transmission line is provided in the outer ring structure.

[0016] In a preferred embodiment of the present invention, the stress monitoring integrated module and the stress nondestructive testing probe are electrically connected via wireless signals; and the signal and data transmission module is electrically connected to an external computer via wireless signals.

[0017] In a preferred embodiment of the present invention, the rolling body includes a main push roller, the retaining frame structure includes a main push retaining frame, the main push roller is supported and positioned in the main push retaining frame, a probe groove is provided on the main push retaining frame, the stress non-destructive testing probe is movably provided in the probe groove, and the stress non-destructive testing probe can directly contact the end face of the main push roller.

[0018] In a preferred embodiment of the present invention, the rolling body also includes radial rollers and auxiliary thrust rollers, and the retaining frame structure also includes auxiliary thrust retainers and radial retainers. The auxiliary thrust retainer supports and positions the auxiliary thrust roller, and the radial retainer supports and positions the radial roller. Probe grooves are provided on the auxiliary thrust retainer and the radial retainer, and the stress non-destructive testing probe can be movably provided in the probe groove, and the stress non-destructive testing probe can directly contact the end face of the radial roller or the auxiliary thrust roller.

[0019] In a preferred embodiment of the present invention, the outer ring structure includes a first outer ring and a second outer ring that can be connected axially, a first outer ring raceway and a second outer ring raceway are arranged in the first outer ring, and a third outer ring raceway is arranged in the second outer ring; a first inner ring raceway and a second inner ring raceway are arranged on the outer wall of the inner ring structure; the main push roller is arranged between the first outer ring raceway and the first inner ring raceway, the radial roller is arranged between the second outer ring raceway and the outer wall of the inner ring structure, and the auxiliary push roller is arranged between the third outer ring raceway and the second inner ring raceway.

[0020] As described above, the main bearing of the tunnel boring machine of the present invention has the following beneficial effects:

[0021] The main bearing of the tunnel boring machine of the present invention monitors the stress of the rolling elements in real time online when the tunnel boring machine is in service, which is conducive to understanding the actual load condition of the main bearing; the stress non-destructive detection probe is in direct contact with the rolling elements, there is no error accumulation in the signal collection route, the stress monitoring accuracy is high, and the monitoring module structure is simple; the stress non-destructive detection probe is in direct contact with the non-load-bearing surface of the rolling elements, and the stress of the main bearing rollers is non-destructively sensed without reducing the load-bearing performance and normal operation of the main bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The following drawings are only intended to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0023] in:

[0024] Figure 1 : It is a schematic diagram of the internal structure of the main bearing of the tunnel boring machine of the present invention.

[0025] Figure 2 : It is the structural representation of the main push roller place of the present invention.

[0026] Figure 3 :for Figure 2 Cross-sectional view at AA in the middle.

[0027] Figure 4 :for Figure 3 Enlarged view of point I in the middle.

[0028] Figure 5 : It is the front view of the stress nondestructive testing probe of the present invention.

[0029] Figure 6 : A top view of the stress nondestructive testing probe of the present invention.

[0030] In the picture:

[0031] 1. First outer ring; 2. Second outer ring; 3. Inner ring structure; 4. Main push roller; 5. Main push cage; 51. Probe slot; 6. Auxiliary push roller; 7. Auxiliary push cage; 8. Radial roller; 9. Radial cage; 10. Stress non-destructive testing probe; 101. Probe data transmission line; 102. Probe coil; 103. Adsorption end face; 11. Stress monitoring integrated module; 111. Power storage and energy supply module; 112. Data processing module; 113. Signal and data receiving module; 114. Data storage module; 121. Signal and data transmission module; 122. Signal data transmission line; 13. Permanent magnet block; 14. External computer; 15. Line channel. DETAILED DESCRIPTION

[0032] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0033] The specific embodiments of the present invention described herein are intended only to illustrate the present invention and are not to be construed as limiting the present invention in any way. In light of the present invention, a skilled person may conceive of any possible variations based on the present invention, all of which should be considered to fall within the scope of the present invention. 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 an intermediate 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 an intermediate element at the same time. The terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to mechanical or electrical connections, or to internal communication between two elements, and may be directly connected or indirectly connected through an intermediate medium. A person of ordinary skill in the art can understand the specific meanings of the above terms based on the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are intended only to describe specific embodiments and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] like Figures 1 to 6 As shown, the present invention provides a main bearing for a roadheader, comprising an outer ring structure and an inner ring structure 3. Rolling bodies are arranged between the outer ring structure and the inner ring structure 3. The rolling bodies withstand the squeezing force exerted by the outer ring structure and the inner ring structure 3 and provide support. A retaining frame structure for supporting and positioning the rolling bodies is provided within the outer ring structure. The retaining frame structure is used to maintain the position of the rolling bodies to prevent them from moving around or colliding with each other.

[0036] A stress non-destructive testing probe 10 is movably provided on the retaining structure. The stress non-destructive testing probe 10 can directly contact the non-load-bearing surface of the rolling element to detect the stress of the rolling element. The stress non-destructive testing probe 10 is electrically connected to a stress monitoring integrated module 11. The stress monitoring integrated module 11 can receive probe detection signals, process data, store data, and provide power and ultrasonic energy to the stress non-destructive testing probe 10. The stress monitoring integrated module 11 can also receive external operation command signals and feed back rolling element stress data to the outside world. The external operation command signals and rolling element stress data are sent or received by an external computer and fed back to the engineer.

[0037] Through timely feedback, designers can optimize the design matching degree based on the feedback parameters, adjust the design margin, and make targeted adjustments to the excavation parameters; monitor the real-time stress status of the rolling elements (rollers) to prevent damage to the main bearings caused by instantaneous overload during excavation.

[0038] The main bearing of the tunnel boring machine of the present invention monitors the stress of the rolling elements (rollers) in real time online when the tunnel boring machine is in service (without disassembly, shutdown, or damage to various components), which is conducive to understanding the actual load condition of the main bearing and making targeted adjustments to the tunneling parameters to prevent damage to the main bearing caused by instantaneous overload during the tunneling process; the stress non-destructive detection probe (signal collection point) is in direct contact with the rolling elements (rollers), there is no error accumulation in the signal collection route, the stress monitoring accuracy is high, and the monitoring module structure is simple; the stress non-destructive detection probe is in direct contact with the non-load-bearing surface of the rolling element, the stress of the main bearing roller is non-destructively sensed, and the load-bearing performance and normal operation of the main bearing are not reduced.

[0039] In the tunnel boring machine main bearing of this invention, an integrated ultrasonic nondestructive stress testing module is embedded within the bearing structure to monitor rolling element (roller) stress in real time. Before performing nondestructive stress testing, a calibration experiment is performed. A gradient of known forces is applied to the rolling element (roller). Testing is then performed in the laboratory at the center of rollers of specific specifications under varying loads. The testing tool used is an ultrasonic probe.

[0040] This test employs two principles, either of which can be used, but both require experimental calibration. The first principle states that steel deforms when subjected to force. Under the same conditions, the elastic modulus of the same material is a constant. By measuring the strain generated at the center of a roller subjected to a known force, the nonlinear coefficient corresponding to the load force and the strain at the center of the end face is calculated inversely. This coefficient is then applied to monitoring the main bearing in service.

[0041] The second principle is: based on the theory of acoustic elasticity, the changing relationship between the speed of sound and stress in the elastic medium is utilized. That is, when the stress changes, the propagation speed of the ultrasonic wave will also change accordingly. By measuring the change in the propagation speed of the ultrasonic wave in the workpiece, the stress at the center position of the roller end face is calculated, and the nonlinear coefficient corresponding to the loading force on the roller and the stress at the center position of the end face is reversely calculated. This coefficient is applied to the monitoring of the main bearing in service status.

[0042] Further, if Figure 2As shown, the stress monitoring integrated module 11 includes a power storage and energy supply module 111, a data processing module 112, a signal and data receiving module 113, and a data storage module 114. The power storage and energy supply module 111 is used to supply power to the stress nondestructive testing probe 10 and provide ultrasonic energy. The power storage and energy supply module 111 can be a battery or a self-generating component. The inner ring structure rotates, and the coil is set to cut the magnetic flux lines to generate induced current and collect electrical energy.

[0043] Further, if Figure 1 As shown, a signal and data transmission module 121 is also provided within the outer ring structure. The signal and data transmission module 121 can be electrically connected to an external computer 14. The signal and data transmission module 121 is used to transmit signals and data between the stress monitoring integrated module 11 and the external computer 14. The external computer 14 is used to monitor and analyze the sensed roller stress data.

[0044] The signal and data receiving module 113 receives external operation command signals and transmits them to the data processing module 112. The data processing module 112 activates the power storage module 111 to power the stress nondestructive testing probe 10, which then emits ultrasonic waves to test the rolling element. After testing, the probe detection signal is transmitted to the data processing module 112 for processing. The processing results are fed back to the data storage module 114, which stores the data and transmits it to an external computer for feedback to the engineer.

[0045] Further, if Figure 5 、 Figure 6 As shown, a probe coil 102 is provided at one end of the stress nondestructive testing probe 10 . The probe coil 102 generates a magnetic force when energized so that the stress nondestructive testing probe 10 is adsorbed on the end surface of the rolling element.

[0046] Further, if Figure 3 、 Figure 4 As shown, a permanent magnet block 13 is provided on the retaining structure, and an adsorption end surface 103 is provided at the other end of the stress nondestructive testing probe 10. The permanent magnet block 13 can adsorb the adsorption end surface 103 by magnetic force to separate the stress nondestructive testing probe 10 from the rolling element (when not in the monitoring state); the magnetic force of the permanent magnet block 13 on the adsorption end surface 103 is smaller than the magnetic force generated by the probe coil 102 when energized.

[0047] In the first embodiment, a probe coil 102 is provided on the lower end surface of the stress nondestructive testing probe 10. When powered, electromagnetic induction generates a magnetic force that causes the stress nondestructive testing probe 10 to be adsorbed on the end surface of the roller. This magnetic force is greater than the magnetic force of the permanent magnet block 13 on the adsorption end surface 103, enabling the stress nondestructive testing probe 10 to be adsorbed on the roller for long-term monitoring.

[0048] The roller is often immersed in oil, keeping its end surface lubricated. This lubricating oil acts as a coupling agent for ultrasonic transmission. When the external computer 14 sends a command to stop monitoring, the power supply module 111 stops supplying power, the lower end surface of the stress nondestructive testing probe 10 separates from the end surface of the roller, and the adsorption end surface 103 of the stress nondestructive testing probe 10 is magnetically attracted by the permanent magnet block 13. The stress nondestructive testing probe 10 remains separated from the roller for a long time, awaiting the next monitoring command.

[0049] In the first embodiment, Figure 1 、 Figure 2 As shown, the stress monitoring integrated module 11 and the stress non-destructive testing probe 10 are electrically connected through the probe data transmission line 101; the signal and data transmission module 121 is electrically connected to the external computer 14 through the signal data transmission line 122, and a line channel 15 for passing through the signal data transmission line 122 is provided in the outer ring structure.

[0050] In the second embodiment, the stress monitoring integrated module 11 and the stress nondestructive testing probe 10 are electrically connected via wireless signals; and the signal and data transmission module 121 is electrically connected to the external computer 14 via wireless signals.

[0051] Further, if Figure 1 、 Figure 2 As shown, the rolling body includes a main push roller 4, and the retaining frame structure includes a main push retaining frame 5. The main push roller 4 is supported and positioned in the main push retaining frame 5. A probe groove 51 is provided on the main push retaining frame 5. A stress non-destructive testing probe 10 is movably provided in the probe groove 51. The stress non-destructive testing probe 10 can directly contact the end face of the main push roller 4.

[0052] Further, if Figure 1 As shown, the rolling body also includes a radial roller 8 and an auxiliary push roller 6, and the cage structure also includes an auxiliary push cage 7 and a radial cage 9. The auxiliary push cage 7 supports and positions the auxiliary push roller 6, and the radial cage 9 supports and positions the radial roller 8. Probe grooves 51 are provided on the auxiliary push cage 7 and the radial cage 9. A stress non-destructive testing probe 10 is movably provided in the probe groove 51. The stress non-destructive testing probe 10 can directly contact the end face of the radial roller 8 or the auxiliary push roller 6 to monitor the auxiliary push roller 6 and the radial roller 8 in real time.

[0053] In embodiment 1, the outer ring structure includes a first outer ring 1 and a second outer ring 2 that can be connected axially (can be connected by bolts), a first outer ring raceway and a second outer ring raceway are arranged in the first outer ring 1, and a third outer ring raceway is arranged in the second outer ring 2; a first inner ring raceway and a second inner ring raceway are arranged on the outer wall of the inner ring structure 3; a main push roller 4 is arranged between the first outer ring raceway and the first inner ring raceway, a radial roller 8 is arranged between the second outer ring raceway and the outer wall of the inner ring structure 3, and an auxiliary push roller 6 is arranged between the third outer ring raceway and the second inner ring raceway.

[0054] Taking the first embodiment as an example, the working state of the main bearing of the tunnel boring machine of the present invention is as follows:

[0055] When stress monitoring of the main bearing is required, a monitoring instruction is initiated by the external computer 14, and the instruction is transmitted to the signal and data transmission module 121 through the signal data transmission line 122. When the inner ring structure 3 rotates to drive the main push cage 5, the signal and data receiving module 113 on it rotates to the vicinity of the signal and data transmission module 121, wireless transmission of instructions and signals can be achieved between the signal and data transmission module 121 and the signal and data receiving module 113. The signal and data receiving module 113 transmits the instruction to the data processing module 112, and the data processing module 112 starts the power storage energy supply module 111 to start powering the stress non-destructive testing probe 10.

[0056] Electromagnetic induction generates magnetic force that causes the stress nondestructive testing probe 10 to be adsorbed onto the end face of the main push roller 4. The stress nondestructive testing probe 10 emits ultrasonic waves to detect the center position of the end face of the main push roller 4. After detection, the probe detection signal is transmitted to the data processing module 112 for processing. The processing result is fed back to the data storage module 114. The data storage module 114 stores the data and transmits it to the signal and data transmission module 121. The data is then transmitted to an external computer via the signal data transmission line 122 and fed back to the engineer.

[0057] When the external computer 14 sends an instruction to stop monitoring, the power storage supply module 111 stops supplying power, the lower end face of the stress non-destructive testing probe 10 is separated from the end face of the main push roller 4, and the adsorption end face 103 of the stress non-destructive testing probe 10 is adsorbed by the magnetic force of the permanent magnet block 13. The stress non-destructive testing probe 10 remains separated from the roller, waiting for the next monitoring instruction.

[0058] The stress detection process of the radial roller 8 and the auxiliary thrust roller 6 is the same as the stress detection of the main thrust roller 4 described above.

[0059] As described above, the main bearing of the tunnel boring machine of the present invention has the following beneficial effects:

[0060] The main bearing of the tunnel boring machine of the present invention monitors the stress of the rolling elements in real time online when the tunnel boring machine is in service, which is conducive to understanding the actual load condition of the main bearing; the stress non-destructive detection probe is in direct contact with the rolling elements, there is no error accumulation in the signal collection route, the stress monitoring accuracy is high, and the monitoring module structure is simple; the stress non-destructive detection probe is in direct contact with the non-load-bearing surface of the rolling elements, and the stress of the main bearing rollers is non-destructively sensed without reducing the load-bearing performance and normal operation of the main bearing.

[0061] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A main bearing for a tunnel boring machine, characterized in that: The invention comprises an outer ring structure and an inner ring structure (3), wherein a rolling body is arranged between the outer ring structure and the inner ring structure (3), and a retaining frame structure for supporting and positioning the rolling body is arranged in the outer ring structure; a stress nondestructive detection probe (10) is movably arranged on the retaining frame structure, and the stress nondestructive detection probe (10) can directly contact the non-bearing surface of the rolling body to detect the stress of the rolling body; the stress nondestructive detection probe (10) is electrically connected to a stress monitoring integrated module (11), and the stress monitoring integrated module (11) can receive probe detection signals, process data, store data, and supply power and ultrasonic energy to the stress nondestructive detection probe (10); the stress monitoring integrated module (11) can also receive external operation instruction signals and feed back rolling body stress data to the outside world.

2. The main bearing of the tunnel boring machine according to claim 1, characterized in that: The stress monitoring integrated module (11) comprises an electrical energy storage module (111), a data processing module (112), a signal and data receiving module (113), and a data storage module (114).

3. The main bearing of the tunnel boring machine according to claim 2, characterized in that: A signal and data transmission module (121) is also provided in the outer ring structure, and the signal and data transmission module (121) can be electrically connected to an external computer (14); the signal and data transmission module (121) is used to transmit signals and data between the stress monitoring integrated module (11) and the external computer (14).

4. The main bearing of the tunnel boring machine according to claim 3, characterized in that: A probe coil (102) is provided at one end of the stress nondestructive testing probe (10), and the probe coil (102) generates a magnetic force when energized to enable the stress nondestructive testing probe (10) to be adsorbed on the end surface of the rolling body.

5. The main bearing of the tunnel boring machine according to claim 4, characterized in that: A permanent magnet block (13) is provided on the retaining frame structure, and an adsorption end face (103) is provided on the other end of the stress nondestructive testing probe (10). The permanent magnet block (13) can adsorb the adsorption end face (103) by magnetic force to separate the stress nondestructive testing probe (10) from the rolling element; the magnetic force of the permanent magnet block (13) on the adsorption end face (103) is smaller than the magnetic force generated by the probe coil (102) when energized.

6. The main bearing of the tunnel boring machine according to claim 3, characterized in that: The stress monitoring integrated module (11) and the stress nondestructive testing probe (10) are electrically connected via a probe data transmission line (101); the signal and data transmission module (121) is electrically connected to an external computer (14) via a signal data transmission line (122); and a line channel (15) for passing through the signal data transmission line is provided in the outer ring structure.

7. The main bearing of the tunnel boring machine according to claim 3, characterized in that: The stress monitoring integrated module (11) and the stress nondestructive testing probe (10) are electrically connected via wireless signals; and the signal and data transmission module (121) is electrically connected to an external computer (14) via wireless signals.

8. The main bearing of the tunnel boring machine according to claim 3, characterized in that: The rolling body includes a main push roller (4), the retaining frame structure includes a main push retaining frame (5), the main push roller (4) is supported and positioned in the main push retaining frame (5), a probe groove (51) is provided on the main push retaining frame (5), the stress nondestructive testing probe (10) is movably provided in the probe groove (51), and the stress nondestructive testing probe (10) can directly contact the end face of the main push roller (4).

9. The main bearing of a tunnel boring machine according to claim 8, characterized in that: The rolling body further comprises a radial roller (8) and an auxiliary thrust roller (6); the retainer structure further comprises an auxiliary thrust retainer (7) and a radial retainer (9); the auxiliary thrust retainer (7) internally supports and positions the auxiliary thrust roller (6); the radial retainer (9) internally supports and positions the radial roller (8); a probe groove (51) is provided on the auxiliary thrust retainer (7) and the radial retainer (9); the stress nondestructive testing probe (10) is movably provided in the probe groove (51); and the stress nondestructive testing probe (10) can directly contact the end face of the radial roller (8) or the auxiliary thrust roller (6).

10. The main bearing of the tunnel boring machine according to claim 9, characterized in that: The outer ring structure comprises a first outer ring (1) and a second outer ring (2) which can be connected in the axial direction, wherein a first outer ring raceway and a second outer ring raceway are arranged in the first outer ring (1), and a third outer ring raceway is arranged in the second outer ring (2); a first inner ring raceway and a second inner ring raceway are arranged on the outer wall of the inner ring structure (3); the main push roller (4) is arranged between the first outer ring raceway and the first inner ring raceway, the radial roller (8) is arranged between the second outer ring raceway and the outer wall of the inner ring structure, and the auxiliary push roller (6) is arranged between the third outer ring raceway and the second inner ring raceway.

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