Heading machine main bearing and heading machine

Abstract

The utility model provides a heading machine main bearing and a heading machine, and relates to the technical field of heading machines, the heading machine main bearing comprises an outer ring, an inner ring, a retainer, a rolling body and a bearing part, the bearing part comprises a first bearing part and a second bearing part, the first bearing part is an annular part, and the second bearing part is an annular part; the second bearing part is arranged on at least one of the outer circumference and the inner circumference of the first bearing part, and the second bearing part abuts against the rolling body; the first bearing part is arranged to be the annular piece, the second bearing part is arranged on at least one of the outer circumference and the inner circumference of the first bearing part, and the second bearing part is used for making contact with the rolling body, so that damage to the inner ring or the outer ring caused by direct friction between the rolling body and the inner ring or the outer ring is relieved; the hardness of the second bearing part is set to be greater than that of the first bearing part, so that the strength and hardness of the surface of the bearing part are improved, the use performance of the main bearing of the heading machine is improved, and the service life of the heading machine is prolonged.

Description

Technical Field

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

[0002] The roadheader is a high-tech equipment used for tunnel excavation. It can complete the functions of tunneling, slag discharge, lining, etc. at one time. It has the advantages of high efficiency, high quality, and high safety factor. It is widely used in many engineering construction fields such as high mountains and hills, submarine tunnels, and municipal engineering. As an important component of the roadheader, the main bearing mainly bears the large thrust, large eccentric load, large torque, and high impact generated by the roadheader during excavation.

[0003] In the prior art, the main function of the main bearing is to support the mechanical rotating body, reduce the friction coefficient during its movement, and ensure its rotation accuracy. The main bearing includes an outer ring, an inner ring, rolling elements, and a cage. The outer ring and the inner ring are connected by rolling elements, and the rolling elements are supported by the cage to maintain their position. The main bearing also includes a bearing unit. The existing bearing unit is often designed as an integral unit with the outer ring or the inner ring. The required structure is obtained by performing medium frequency quenching on the surface of the outer ring or the inner ring containing the bearing unit.

[0004] However, the existing main bearings have the problem of poor performance. Utility Model Content

[0005] The present application provides a main bearing of a tunnel boring machine and a tunnel boring machine, which improves the performance of the main bearing of the tunnel boring machine and increases the service life of the tunnel boring machine.

[0006] In the first aspect, the present application provides a main bearing for a tunnel boring machine, comprising an outer ring, an inner ring, a retaining frame, rolling elements and a supporting member. The outer ring and the inner ring are arranged opposite to each other and surround an annular area. The retaining frame, rolling elements and supporting member are all located in the annular area. The retaining frame is arranged in the middle of the annular area, the rolling elements are arranged on the retaining frame, and the supporting member is arranged on at least one of the rolling elements close to the inner ring and close to the outer ring.

[0007] The bearing member includes a first bearing part and a second bearing part. The first bearing part is an annular part. The second bearing part is arranged on at least one of the outer periphery and the inner periphery of the first bearing part. The second bearing part abuts against the rolling body. The hardness of the second bearing part is greater than that of the first bearing part.

[0008] In the above-mentioned main bearing of the tunnel boring machine, optionally, when the first bearing portion is arranged on a side of the rolling element close to the outer ring, the outer periphery of the first bearing portion and the inner periphery of the outer ring are in close contact.

[0009] And / or, when the first bearing portion is arranged on a side of the rolling element close to the inner ring, the inner periphery of the first bearing portion and the outer periphery of the inner ring are in close contact.

[0010] In the above-mentioned tunnel boring machine main bearing, optionally, when the first bearing part is arranged on the side of the rolling element close to the outer ring, the second bearing part is arranged on the inner periphery of the first bearing part; or, the second bearing part is arranged on the inner periphery and the outer periphery of the first bearing part.

[0011] In the above-mentioned tunnel boring machine main bearing, optionally, when the first bearing part is arranged on the side of the rolling element close to the inner ring, the second bearing part is arranged on the outer periphery of the first bearing part; or, the second bearing part is arranged on the inner periphery and the outer periphery of the first bearing part.

[0012] In the above-mentioned tunnel boring machine main bearing, optionally, the thickness of the first bearing portion near the middle of the tunnel boring machine main bearing in the extension direction is greater than the thickness of the first bearing portion near the end of the tunnel boring machine main bearing in the extension direction.

[0013] In the above-mentioned main bearing of the tunnel boring machine, optionally, the thickness of the first bearing portion gradually decreases from the middle to both ends along the extension direction of the main bearing of the tunnel boring machine.

[0014] In the above-mentioned main bearing of the tunnel boring machine, optionally, the first bearing portion has a first surface close to the outer ring and a second surface close to the inner ring.

[0015] In the first surface, a portion close to the middle in the extending direction of the main bearing of the tunnel boring machine is convex toward the outer ring relative to a portion at an end in the extending direction of the main bearing of the tunnel boring machine.

[0016] Alternatively, in the second surface, a portion close to the middle in the extending direction of the main bearing of the tunnel boring machine is concave inwardly toward the inner ring relative to a portion at an end in the extending direction of the main bearing of the tunnel boring machine.

[0017] In the above-mentioned main bearing of the tunnel boring machine, optionally, the thickness range of the portion of the first bearing portion close to the middle of the extension direction of the main bearing of the tunnel boring machine is greater than or equal to 30 mm and less than or equal to 50 mm.

[0018] And / or, the difference in thickness between the middle portion of the first bearing part close to the extension direction of the tunnel boring machine main bearing and the thickness of the two ends of the first bearing part close to the extension direction of the tunnel boring machine main bearing is greater than or equal to 0.1 mm and less than or equal to 0.2 mm.

[0019] And / or, the thickness of the second bearing portion is greater than or equal to 0.1 mm and less than or equal to 0.3 mm.

[0020] In the above-mentioned main bearing of the tunnel boring machine, optionally, the first bearing part includes a carburized steel part, and the second bearing part includes a tungsten carbide part.

[0021] In the second aspect, the present application provides a tunnel boring machine, including a tunnel boring machine body, a drive system, a main shaft, a drill bit and the above-mentioned tunnel boring machine main bearing, the drive system and the main shaft are both arranged on the tunnel boring machine body, the main shaft is connected to the drill bit through the tunnel boring machine main bearing, and the drive system is configured to provide power to the main shaft, and then the main shaft transmits power to the drill bit to rotate the drill bit.

[0022] The present application provides a main bearing of a tunnel boring machine and a tunnel boring machine, the main bearing of the tunnel boring machine includes an outer ring, an inner ring, a retaining frame, a rolling element and a bearing member, wherein the bearing member includes a first bearing part and a second bearing part, the first bearing part is an annular part, the second bearing part is arranged on at least one of the outer periphery and the inner periphery of the first bearing part, and the second bearing part abuts against the rolling element; by setting the first bearing part as an annular part and setting the second bearing part on at least one of the outer periphery and the inner periphery of the first bearing part, wherein the second bearing part is used to contact with the rolling rolling element, thereby reducing the damage to the inner ring or the outer ring caused by the direct contact and friction between the rolling element and the inner ring or the outer ring; by setting the hardness of the second bearing part to be greater than the hardness of the first bearing part, the strength and hardness of the bearing member are improved, the performance of the tunnel boring machine main bearing is improved, and the service life of the tunnel boring machine is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0024] Figure 1 A schematic diagram of the structure of a main bearing of a tunnel boring machine provided in an embodiment of the present application;

[0025] Figure 2 A schematic diagram of the structure of the bearing member of the main bearing of the tunnel boring machine provided in an embodiment of the present application;

[0026] Figure 3 A schematic structural diagram of a first bearing portion of a main bearing of a tunnel boring machine provided in an embodiment of the present application;

[0027] Figure 4 A schematic structural diagram of a main bearing of a tunnel boring machine provided in an embodiment of the present application.

[0028] Description of reference numerals:

[0029] 100: outer ring; 200: inner ring; 300: cage; 400: rolling element; 500: bearing member;

[0030] 510: first bearing portion; 520: second bearing portion.

[0031] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0032] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0033] The inventors of this application discovered during actual research that a tunnel boring machine is a high-tech equipment used for tunnel excavation, which can complete functions such as tunneling, slag discharge, and lining at one time. It has the advantages of high efficiency, high quality, and high safety factor, and is widely used in many engineering construction fields such as mountains and hills, submarine tunnels, and municipal engineering.

[0034] In the prior art, the main bearing, as the "heart of the tunnel boring machine", mainly bears the large thrust, large eccentric load, large torque, high impact, and strong time-varying load generated by the tunnel boring machine during tunneling. Since the tunnel boring machine can only move forward but not backward, once the main bearing is damaged during the tunneling process, it will cause great property losses. Therefore, the operating status and life of the main bearing also determine the working status and overall life of the tunnel boring machine. The main bearing includes an outer ring, an inner ring, rolling elements, and a cage. The outer ring and the inner ring are connected by rolling elements, and the rolling elements are kept in position with the support of the cage.

[0035] At present, the main bearing also includes a load-bearing unit. On main bearings of different structures, the specifications and material types of the load-bearing unit and internal components are also different. As one of the key weak points of the main bearing of the tunnel boring machine, the material and structure of the load-bearing unit not only determine whether the operation is reliable, but also determine the overall structural strength of the main bearing. The existing load-bearing unit is often obtained by surface medium-frequency quenching with the outer ring or the inner ring. The existing load-bearing unit is prone to wear and unstable performance during use. It is very easy to cause rust, fatigue peeling and other phenomena during use. When the main bearing of the tunnel boring machine works under extreme working conditions, the load-bearing unit will fail due to fatigue early. Therefore, the existing main bearings have the problem of poor performance.

[0036] In view of this, an embodiment of the present application provides a main bearing of a tunnel boring machine and a tunnel boring machine, wherein the main bearing of the tunnel boring machine includes an outer ring, an inner ring, a retaining frame, a rolling element and a bearing member, wherein the bearing member includes a first bearing part and a second bearing part, the first bearing part is an annular part, and the second bearing part is arranged on at least one of the outer periphery and the inner periphery of the first bearing part, and the second bearing part abuts against the rolling element; by setting the first bearing part as an annular part and setting the second bearing part on at least one of the outer periphery and the inner periphery of the first bearing part, wherein the second bearing part is used to contact with the rolling rolling element, thereby reducing the damage to the inner ring or the outer ring caused by the direct contact and friction between the rolling element and the inner ring or the outer ring; by setting the hardness of the second bearing part to be greater than the hardness of the first bearing part, the strength and hardness of the bearing member are improved, the performance of the tunnel boring machine main bearing is improved, and the service life of the tunnel boring machine is improved.

[0037] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0038] First, refer to Figures 1 to 3 As shown, the present application provides a main bearing for a tunnel boring machine, comprising an outer ring 100, an inner ring 200, a retaining frame 300, rolling elements 400 and a bearing member 500. The outer ring 100 and the inner ring 200 are arranged relative to each other and surround an annular area. The retaining frame 300, the rolling elements 400 and the bearing member 500 are all located in the annular area. The retaining frame 300 is arranged in the middle of the annular area, the rolling elements 400 are arranged on the retaining frame 300, and the bearing member 500 is arranged on at least one of the rolling elements 400 close to the inner ring 200 and close to the outer ring 100.

[0039] The bearing member 500 includes a first bearing portion 510 and a second bearing portion 520. The first bearing portion 510 is an annular member. The second bearing portion 520 is arranged on at least one of the outer periphery and the inner periphery of the first bearing portion 510. The second bearing portion 520 abuts against the rolling body 400. The hardness of the second bearing portion 520 is greater than that of the first bearing portion 510.

[0040] For example, when the main bearing of the tunnel boring machine is sleeved on the shaft of the tunnel boring machine, the inner ring 200 of the main bearing of the tunnel boring machine and the shaft are transitionally matched. Driven by the shaft, the inner ring 200 rotates relative to the outer ring 100, and then the rolling body 400 arranged in the annular area rotates. At this time, the rolling body 400 and the bearing part 500 move relative to each other, and then friction occurs. By providing the bearing part, the friction caused by the direct contact between the rolling body 400 and the outer ring 100 and the inner ring 200 is avoided, and the service life of the main bearing of the tunnel boring machine is improved.

[0041] By setting the bearing member 500 as a first bearing part 510 and a second bearing part 520, setting the second bearing part 520 on at least one of the outer periphery and the inner periphery of the first bearing part 510, and setting the hardness of the second bearing part 520 to be greater than the hardness of the first bearing part 510, the second bearing part 520 can still maintain high strength and hardness under severe escape conditions and high load conditions, thereby improving the wear resistance of the bearing member 500. In this way, during the rolling process of the rolling body 400, the rolling body 400 directly contacts and rubs against the second bearing part 520, thereby improving the performance of the main bearing of the tunnel boring machine.

[0042] As a feasible implementation, when the first bearing portion 510 is disposed on a side of the rolling element 400 close to the outer ring 100 , the outer periphery of the first bearing portion 510 and the inner periphery of the outer ring 100 are in close contact.

[0043] As a feasible implementation, when the first bearing portion 510 is disposed on a side of the rolling element 400 close to the inner ring 200 , the inner periphery of the first bearing portion 510 and the outer periphery of the inner ring 200 are in close contact with each other.

[0044] In some embodiments, the first bearing portion 510 is arranged on the side of the rolling body 400 close to the outer ring 100, and the outer periphery of the first bearing portion 510 is in close contact with the inner periphery of the outer ring 100. In this way, when the bearing component 500 is damaged due to friction, rust, fatigue, etc., the bearing component 500 can be replaced by a vacuum suction cup device. In other words, the bearing component 500 installed on the inner periphery of the outer ring 100 can be repeatedly disassembled and assembled by the vacuum suction cup device, thereby reducing the maintenance cost of the main bearing of the tunnel boring machine and increasing the service life of the main bearing of the tunnel boring machine.

[0045] In other embodiments, the first bearing portion 510 is arranged on a side of the rolling body 400 close to the inner ring 200, and the inner periphery of the first bearing portion 510 is in close contact with the outer periphery of the inner ring 200. In this way, when the bearing component 500 is damaged due to friction, rust, fatigue, etc., the bearing component 500 can be replaced by a vacuum suction cup device. In other words, the bearing component 500 installed on the inner periphery of the outer ring 100 can be repeatedly disassembled and assembled by the vacuum suction cup device, thereby reducing the maintenance cost of the main bearing of the tunnel boring machine and increasing the service life of the main bearing of the tunnel boring machine.

[0046] The close contact refers to the interference fit between the outer periphery of the first bearing part 510 and the inner periphery of the outer ring 100, or the interference fit between the inner periphery of the first bearing part 510 and the outer periphery of the inner ring 200. Interference fit is a connection method that uses elastic pressure generated between the surfaces of two contacting parts to obtain a tight connection. Interference fit has the advantages of simple structure, good coaxiality, and the ability to withstand large axial forces.

[0047] As a feasible implementation, when the first bearing portion 510 is arranged on the side of the rolling body 400 close to the outer ring 100, the second bearing portion 520 is arranged on the inner periphery of the first bearing portion 510; or, the second bearing portion 520 is arranged on the inner periphery and the outer periphery of the first bearing portion 510.

[0048] In some embodiments, when the first bearing portion 510 is disposed on a side of the rolling element 400 close to the outer ring 100, considering that the rolling element 400 will only abut against the inner periphery of the first bearing portion 510, the second bearing portion 520 is only disposed on the inner periphery of the first bearing portion 510 to reduce the damage caused by the friction of the rolling element 400 to the bearing member 500. At the same time, materials are saved.

[0049] In other embodiments, when the first bearing portion 510 is disposed on a side of the rolling body 400 close to the outer ring 100, the second bearing portion 520 is disposed on the outer periphery and the inner periphery of the first bearing portion 510. By arranging the second bearing portion 520 on the outer periphery and the inner periphery of the first bearing portion 510, the rolling body 400 directly contacts the second bearing portion 520 when rolling, thereby improving the strength and hardness of the bearing component 500 and improving the bearing capacity of the bearing component 500.

[0050] As a feasible implementation, when the first bearing portion 510 is arranged on the side of the rolling body 400 close to the inner ring 200, the second bearing portion 520 is arranged on the outer periphery of the first bearing portion 510; or, the second bearing portion 520 is arranged on the inner periphery and the outer periphery of the first bearing portion 510.

[0051] In some embodiments, when the first bearing portion 510 is disposed on a side of the rolling body 400 close to the inner ring 200, considering that the rolling body 400 will only abut against the outer periphery of the first bearing portion 510, the second bearing portion 520 is only disposed on the outer periphery of the first bearing portion 510 to reduce the damage caused by the friction of the rolling body 400 to the bearing member 500.

[0052] In other embodiments, when the first bearing portion 510 is disposed on a side of the rolling body 400 close to the inner ring 200, the second bearing portion 520 is disposed on the outer periphery and the inner periphery of the first bearing portion 510. By disposing the second bearing portion 520 on the outer periphery and the inner periphery of the first bearing portion 510, the rolling body 400 directly contacts the second bearing portion 520 when rolling, thereby improving the strength and hardness of the bearing member 500 and improving the bearing capacity of the bearing member 500.

[0053] As a feasible implementation, the thickness of the first bearing portion 510 near the middle of the extension direction of the main bearing of the tunnel boring machine is greater than the thickness of the first bearing portion 510 near the end of the extension direction of the main bearing of the tunnel boring machine.

[0054] For example, the main bearing used in the tunnel boring machine is a cylindrical roller bearing, which has a large load capacity and mainly bears radial loads. By setting the thickness of the first bearing part 510 near the middle of the extension direction of the tunnel boring machine main bearing to be greater than the thickness of the first bearing part 510 near the end of the extension direction of the tunnel boring machine main bearing, when the tunnel boring machine main bearing is subjected to radial loads, the middle part of the tunnel boring machine main bearing along the axial extension can bear a larger load and transfer the load to the two ends of the tunnel boring machine main bearing along the axial extension direction, thereby improving the load capacity of the bearing 500 and improving the structural stability of the bearing 500.

[0055] As a feasible implementation, the thickness of the first bearing portion 510 gradually decreases from the middle to both ends along the extension direction of the main bearing of the tunnel boring machine.

[0056] For example, the thickness of the first bearing part 510 gradually decreases in a linear pattern from the middle to the two ends along the extension direction of the main bearing of the tunnel boring machine. By setting the thickness of the first bearing part 510 to gradually decrease in a linear pattern, it is beneficial to the processing of the first bearing part 510 during the molding process. At the same time, during the use of the main bearing of the tunnel boring machine, the first bearing part 510 will not affect the rolling of the rolling element 400. If the thickness of the first bearing part 510 decreases in a step-like manner from the middle to the two ends along the extension direction of the main bearing of the tunnel boring machine, this will affect the rolling of the rolling element 400, increase the friction between the rolling element 400 and the bearing part 500, and is not conducive to improving the service life of the main bearing of the tunnel boring machine. Therefore, the present application sets the thickness of the first bearing part 510 to decrease in a linear pattern from the middle to the two ends along the extension direction of the main bearing of the tunnel boring machine.

[0057] As a feasible implementation, the first bearing portion 510 has a first surface close to the outer ring 100 and a second surface close to the inner ring 200 .

[0058] In the first surface, a portion close to the middle in the extending direction of the main bearing of the tunnel boring machine is convex toward the direction close to the outer ring 100 relative to a portion at an end in the extending direction of the main bearing of the tunnel boring machine.

[0059] As a feasible implementation, in the second surface, a portion close to the middle of the extension direction of the tunnel boring machine main bearing is concave inwardly toward the inner ring 200 relative to a portion at an end of the extension direction of the tunnel boring machine main bearing.

[0060] In some embodiments, when the first bearing portion 510 is disposed on the side of the rolling element 400 close to the outer ring 100, in the first surface, the portion close to the middle portion in the extending direction of the main bearing of the tunnel boring machine is convex toward the direction close to the outer ring 100 relative to the portion at the end portion in the extending direction of the main bearing of the tunnel boring machine. Figure 2As shown, the first bearing portion 510 is an arc-shaped structure. The first bearing portion 510 with an arc-shaped structure can bear a larger load. At the same time, the portion close to the middle of the extension direction of the tunnel boring machine main bearing can disperse the load to the end of the extension direction of the tunnel boring machine main bearing, thereby improving the stability of the first bearing portion 510, improving the structural stability of the tunnel boring machine main bearing, and improving the performance of the tunnel boring machine main bearing.

[0061] In other embodiments, when the first bearing portion 510 is disposed on the side of the rolling element 400 close to the inner ring 200, the portion close to the middle of the extension direction of the tunnel boring machine main bearing in the second surface is concave relative to the portion at the end of the extension direction of the tunnel boring machine main bearing toward the direction close to the inner ring 200. In this way, the first bearing portion 510 is an arc-shaped structure, and the first bearing portion 510 of the arc-shaped structure can bear a larger load, and at the same time, the portion close to the middle of the extension direction of the tunnel boring machine main bearing can disperse the load to the end of the extension direction of the tunnel boring machine main bearing, thereby improving the stability of the first bearing portion 510, improving the structural stability of the tunnel boring machine main bearing, and improving the performance of the tunnel boring machine main bearing.

[0062] As a feasible implementation, the first bearing part 510 includes a carburized steel part, and the second bearing part 520 includes a tungsten carbide part.

[0063] For example, the material of the carburized steel part may be G20CrNi2MoA, which is a commonly used high-quality alloy carburized steel. After carburizing treatment, the surface has a relatively high hardness, wear resistance and contact fatigue strength, while the core retains good toughness and can withstand high impact loads.

[0064] For example, the material of the tungsten carbide part can be tungsten carbide (WC). Tungsten carbide is a hexagonal crystal, and the bonding angle with G20CrNi2MoA is almost zero. It has the characteristics of good wear resistance, small thermal expansion coefficient, high hardness, high melting point, etc.

[0065] It is understandable that, since tungsten carbide can wet most steel materials, carburized steel parts can be replaced with most steel parts.

[0066] As a feasible implementation, the thickness of the first bearing portion 510 close to the middle of the extension direction of the main bearing of the tunnel boring machine is greater than or equal to 30 mm and less than or equal to 50 mm.

[0067] For example, when the thickness range of the first bearing portion 510 close to the middle part of the extension direction of the tunnel boring machine main bearing is set to less than 30 mm, the first bearing portion 510 cannot bear excessive load due to its too thin thickness; when the thickness range of the first bearing portion 510 close to the middle part of the extension direction of the tunnel boring machine main bearing is set to greater than 50 mm, the first bearing portion 510 is too thick and heavy, which is not conducive to using a vacuum suction cup device to install the bearing component 500 in the annular area of ​​the tunnel boring machine main bearing. Therefore, the present application sets the thickness range of the first bearing portion 510 close to the middle part of the extension direction of the tunnel boring machine main bearing to greater than or equal to 30 mm and less than or equal to 50 mm, which is conducive to the bearing component 500 being installed on at least one of the outer ring 100 and the inner ring 200 through the vacuum suction cup device, thereby improving the bearing capacity of the bearing component 500 and improving the structural stability of the tunnel boring machine main bearing.

[0068] As a feasible implementation, the dimensional difference range of the thickness of the first bearing part 510 close to the middle of the extension direction of the main bearing of the tunnel boring machine and the thickness of the first bearing part 510 close to the two ends of the extension direction of the main bearing of the tunnel boring machine is greater than or equal to 0.1mm and less than or equal to 0.2mm.

[0069] For example, by setting the dimensional difference range of the thickness of the first bearing portion 510 close to the middle of the extension direction of the tunnel boring machine main bearing and the thickness of the first bearing portion 510 close to the two ends of the extension direction of the tunnel boring machine main bearing to be greater than or equal to 0.1 mm and less than or equal to 0.2 mm, it can be ensured that the first bearing portion 510 is an arc structure to distribute and transfer the load; and the problem of assembly difficulty and unstable structure of the tunnel boring machine main bearing caused by excessive difference in thickness between the middle and end parts of the first bearing portion 510 can be avoided.

[0070] As a feasible implementation, the thickness of the second bearing portion 520 is greater than or equal to 0.1 mm and less than or equal to 0.3 mm.

[0071] For example, when the thickness of the second bearing part 520 is less than 0.1 mm, and the second bearing part 520 is arranged on at least one of the inner periphery and the outer periphery of the first bearing part 510, due to the excessive thinness of the second bearing part 520, the hardness and strength provided by the second bearing part 520 are insufficient to support the friction between the rolling element 400 and the second bearing part 520, which may easily cause damage to the second bearing part 520; when the thickness of the second bearing part 520 is greater than 0.3 mm, and the second bearing part 520 is arranged on at least one of the inner periphery and the outer periphery of the first bearing part 510, due to the excessive thickness of the second bearing part 520, considering that tungsten carbide itself is relatively brittle, the second bearing part 520 cannot bear excessive loads due to its brittleness, which may easily cause damage. Therefore, the present application sets the thickness of the second bearing part 520 to be greater than or equal to 0.1 mm, and less than or equal to 0.3 mm.

[0072] In the second aspect, the present application provides a tunnel boring machine, including a tunnel boring machine body, a drive system, a main shaft, a drill bit and the above-mentioned tunnel boring machine main bearing, the drive system and the main shaft are both arranged on the tunnel boring machine body, the main shaft is connected to the drill bit through the tunnel boring machine main bearing, and the drive system is configured to provide power to the main shaft, and then the main shaft transmits power to the drill bit to rotate the drill bit.

[0073] For example, during the operation of the tunnel boring machine, when the main bearing of the tunnel boring machine is subjected to a huge impact force, the rolling element 400 bears a huge load, and the rolling element 400 contacts and rubs against the bearing member 500 to relieve the force on the main bearing of the tunnel boring machine, thereby improving the impact resistance of the main bearing of the tunnel boring machine and making it less likely for the main bearing of the tunnel boring machine to be damaged by external impact force, thereby increasing the service life of the main bearing of the tunnel boring machine and the safety and reliability of the tunnel boring machine construction.

[0074] For example, refer to Figure 4 As shown, the main bearing of the tunnel boring machine is usually a three-row cylindrical roller bearing, and the main feature of the three-row cylindrical roller bearing is that it has three rows of cylindrical rollers. The inner ring 200 and the outer ring 100 of the three-row cylindrical roller bearing are respectively installed on the shaft and the seat ring, and the rollers are located between the inner and outer rings 100, supporting and transmitting the load through rolling motion. The cage 300 is used to maintain the position of the rollers to ensure that they maintain the correct gap and relative position during operation. Among them, the three rows of cylindrical rollers are in contact with at least one of the outer ring 100 and the inner ring 200 through the bearing member 500, thus improving the impact resistance of the tunnel boring machine main bearing, increasing the service life of the tunnel boring machine main bearing, and improving the performance of the tunnel boring machine.

[0075] It is understandable that, since the tunnel boring machine of the present application adopts the technical solution of the above-mentioned tunnel boring machine main bearing embodiment, it at least has the beneficial effects brought by the technical solution of the above-mentioned embodiment, which will not be described one by one here.

[0076] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the application disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0077] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A main bearing of a tunnel boring machine, characterized in that: The invention comprises an outer ring, an inner ring, a retainer, a rolling element and a bearing member, wherein the outer ring and the inner ring are arranged opposite to each other and surround an annular area, the retainer, the rolling element and the bearing member are all located in the annular area, the retainer is arranged in the middle of the annular area, the rolling element is arranged on the retainer, and the bearing member is arranged on at least one of the inner ring and the outer ring of the rolling element; The bearing member includes a first bearing part and a second bearing part, the first bearing part is an annular part, the second bearing part is arranged on at least one of the outer periphery and the inner periphery of the first bearing part, the second bearing part abuts against the rolling body, and the hardness of the second bearing part is greater than the hardness of the first bearing part.

2. The main bearing of the tunnel boring machine according to claim 1, characterized in that: When the first bearing portion is arranged on a side of the rolling element close to the outer ring, the outer periphery of the first bearing portion and the inner periphery of the outer ring are in close contact; And / or, when the first bearing portion is arranged on a side of the rolling element close to the inner ring, the inner periphery of the first bearing portion and the outer periphery of the inner ring are in close contact.

3. The main bearing of the tunnel boring machine according to claim 1, characterized in that: When the first bearing portion is arranged on a side of the rolling element close to the outer ring, the second bearing portion is arranged on the inner periphery of the first bearing portion; or, the second bearing portion is arranged on the inner periphery and the outer periphery of the first bearing portion.

4. The main bearing of the tunnel boring machine according to claim 1, characterized in that: When the first bearing portion is arranged on a side of the rolling element close to the inner ring, the second bearing portion is arranged on the outer periphery of the first bearing portion; or, the second bearing portion is arranged on the inner periphery and the outer periphery of the first bearing portion.

5. The main bearing of a tunnel boring machine according to any one of claims 3 or 4, characterized in that: The thickness of the first bearing portion close to the middle portion in the extending direction of the tunnel boring machine main bearing is greater than the thickness of the first bearing portion close to the end portion in the extending direction of the tunnel boring machine main bearing.

6. The main bearing of the tunnel boring machine according to claim 5, characterized in that: The thickness of the first bearing portion gradually decreases from the middle to both ends of the extension direction of the main bearing of the tunnel boring machine.

7. The main bearing of the tunnel boring machine according to claim 6, characterized in that: The first bearing portion has a first surface close to the outer ring and a second surface close to the inner ring; In the first surface, a portion close to the middle of the main bearing of the tunnel boring machine in the extending direction is convex toward the outer ring relative to a portion at an end of the main bearing of the tunnel boring machine in the extending direction; Alternatively, in the second surface, a portion close to a middle portion in an extending direction of the tunnel boring machine main bearing is concave inwardly toward a direction close to the inner ring relative to a portion at an end portion in the extending direction of the tunnel boring machine main bearing.

8. The main bearing of a tunnel boring machine according to any one of claims 6 to 7, characterized in that: The thickness of the first bearing portion close to the middle of the main bearing of the tunnel boring machine in the extension direction is greater than or equal to 30 mm and less than or equal to 50 mm; And / or, the difference between the thickness of the first bearing portion close to the middle of the main bearing of the tunnel boring machine in the extending direction and the thickness of the first bearing portion close to both ends of the main bearing of the tunnel boring machine in the extending direction is greater than or equal to 0.1 mm and less than or equal to 0.2 mm; And / or, the thickness of the second bearing portion is greater than or equal to 0.1 mm and less than or equal to 0.3 mm.

9. The main bearing of the tunnel boring machine according to claim 7, characterized in that: The first bearing part includes a carburized steel part, and the second bearing part includes a tungsten carbide part.

10. A tunnel boring machine, characterized in that: The invention comprises a tunnel boring machine body, a driving system, a main shaft, a drill bit and a tunnel boring machine main bearing as described in any one of claims 1 to 9, wherein the driving system and the main shaft are both arranged on the tunnel boring machine body, the main shaft is connected to the drill bit through the tunnel boring machine main bearing, and the driving system is configured to provide power to the main shaft, and then the main shaft transmits power to the drill bit to rotate the drill bit.

Images