Large-diameter heading machine main bearing and assembling method

Abstract

The invention relates to the technical field of heading machines, in particular to a large-diameter heading machine main bearing and an assembling method. The large-diameter heading machine main bearing comprises an outer ring assembly, an inner gear ring, a main pushing check ring, a main pushing roller assembly, an auxiliary pushing roller assembly and a radial roller assembly. The outer ring assembly comprises a first outer ring, a second outer ring and a third outer ring which are coaxially connected in sequence, a main pushing roller path is defined by the inner wall of the first outer ring, the outer wall of the inner gear ring, the side wall of the second outer ring and the side wall of the main pushing check ring, and the main pushing roller assembly is installed in the main pushing roller path; a radial roller path is formed between the side wall of the second outer ring and the side wall of the inner gear ring, and the radial roller assembly is installed in the radial roller path; an auxiliary pushing roller path is defined by the outer wall of the third outer ring, the side wall of the second outer ring and the inner wall of the inner gear ring, and the auxiliary pushing roller assembly is installed in the auxiliary pushing roller path. According to the large-diameter heading machine main bearing, the difficulty of subsequent manufacturing and heat treatment is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of tunnel boring machines, and in particular to a main bearing of a large-diameter tunnel boring machine and an assembly method thereof. Background Art

[0002] The roadheader is a high-precision assembly used for tunnel excavation, and the main bearing is its key core component. The main bearing mainly bears the huge complex alternating loads and overturning moments generated by the roadheader during excavation.

[0003] In the prior art, the main bearings of the tunnel boring machine are mainly three-row cylindrical roller bearings, in which the main thrust rollers are mainly used to bear the huge axial force, the radial rollers are used to bear the radial force, and the auxiliary thrust rollers are used to balance the overturning moment.

[0004] However, with the needs of the project, the diameter of the tunnel boring machine is getting larger and larger, and the diameter requirement of the main bearing is gradually increasing. In addition, the structural shapes of the main bearing components of the traditional structural design are irregular, and the irregular structural shapes of the components make subsequent manufacturing and heat treatment more difficult. Summary of the invention

[0005] The present application provides a main bearing of a large diameter tunnel boring machine and an assembly method thereof, so as to solve the problem that the main bearing of the large diameter tunnel boring machine is difficult to manufacture and heat treat due to the irregular structure shape.

[0006] On the one hand, the present application provides a main bearing for a large-diameter tunnel boring machine, comprising an outer ring assembly, an inner gear ring, a main thrust retaining ring, a main thrust roller assembly, an auxiliary thrust roller assembly and a radial roller assembly;

[0007] The outer ring assembly comprises a first outer ring, a second outer ring and a third outer ring which are coaxially connected in sequence, the first outer ring is mounted on the inner gear ring, the main thrust and retaining ring is arranged on a side of the first outer ring away from the second outer ring, a main thrust raceway is formed between the inner wall of the first outer ring, the outer wall of the inner gear ring, the side wall of the second outer ring and the side wall of the main thrust and retaining ring, and the main thrust roller assembly is mounted in the main thrust raceway;

[0008] The second outer ring is located on the side of the inner gear ring, a radial raceway is formed between the side wall of the second outer ring and the side wall of the inner gear ring, and the radial roller assembly is installed in the radial raceway;

[0009] The inner gear ring is partially installed on the third outer ring, and an auxiliary thrust raceway is formed between the outer wall of the third outer ring, the side wall of the second outer ring and the inner wall of the inner gear ring. The auxiliary thrust roller assembly is installed in the auxiliary thrust raceway.

[0010] In some embodiments, the radial roller assembly includes a radial roller and a radial retaining frame for mounting the radial roller, a limiting groove is opened on the side wall of the second outer ring, the radial roller partially protrudes from the radial retaining frame, and the protruding portion of the radial roller is embedded in the limiting groove.

[0011] In some embodiments, the radial retaining frame is evenly provided with a plurality of pockets, the radial rollers are arranged in the pockets in a one-to-one correspondence, and the opening width of the pockets on a side away from the second outer ring is smaller than the diameter of the radial rollers.

[0012] In some embodiments, the pocket includes a straight hole section and a V-shaped hole section, the V-shaped hole section is connected to the straight hole section, the width of the straight hole section is greater than the diameter of the radial roller, and the width of the V-shaped hole section at one end away from the straight hole section is less than the diameter of the radial roller.

[0013] In some embodiments, there is a gap b between the side wall of the V-shaped hole segment and the radial roller, and 0.2 mm≤b≤1 mm.

[0014] In some embodiments, the angle between the side wall of the V-shaped hole segment and the central axis of the V-shaped hole segment is c, 25°≤c≤45°.

[0015] In some embodiments, the thickness of the radial retainer is greater than the radius of the radial roller and smaller than the diameter of the radial roller.

[0016] In some embodiments, the auxiliary thrust roller assembly includes an auxiliary thrust roller, an auxiliary thrust retainer and a floating member, the auxiliary thrust roller is mounted on the auxiliary thrust retainer, the floating member is arranged on the outer wall of the third outer ring and contacts the auxiliary thrust roller to provide a floating distance for the auxiliary thrust roller.

[0017] In some embodiments, the floating member includes a disc spring member and a floating ring, the third outer ring is provided with a mounting groove, the disc spring member is arranged in the mounting groove, the floating ring is installed on the third outer ring and contacts the disc spring member, and the auxiliary thrust retainer is installed on the floating ring.

[0018] On the other hand, the present application provides a method for assembling a main bearing of a large diameter tunnel boring machine, which is used to assemble the main bearing of the large diameter tunnel boring machine as described above, and the assembly method comprises the following steps:

[0019] Install the second outer ring on the third outer ring, and ensure that the axes of the second outer ring and the third outer ring coincide with each other;

[0020] Install the auxiliary thrust roller assembly on the outer wall of the third outer ring and tightly abut against the side wall of the second outer ring;

[0021] Installing the radial roller assembly on the radial raceway of the side wall of the second outer ring;

[0022] Installing the inner gear ring on the auxiliary thrust roller assembly, and making the side wall of the inner gear ring tightly against the radial roller assembly;

[0023] Install the main push roller assembly on the inner gear ring and press it against the side wall of the second outer ring;

[0024] Install the main thrust ring onto the side wall of the first outer ring;

[0025] Install the first outer ring and the main thrust ring on the second outer ring, and ensure that the axes of the first outer ring and the third outer ring coincide with each other.

[0026] The present application provides a large-diameter main bearing for a tunnel boring machine and an assembly method thereof. The main bearing for a large-diameter tunnel boring machine comprises an outer ring assembly, an inner gear ring, a main thrust and retaining ring, a main thrust roller assembly, an auxiliary thrust roller assembly and a radial roller assembly; the outer ring assembly comprises a first outer ring, a second outer ring and a third outer ring which are coaxially connected in sequence; thereby, the main bearing of the tunnel boring machine is decomposed into a bearing with a five-part structure, and the cross-section of each part structure is made more approximately rectangular, the processing of large-diameter rectangular cross-section forgings is simpler, less material is removed during the forging process, material utilization is improved, and the cost of forgings is reduced; at the same time, when the outer ring assembly with an approximately rectangular cross-section is quenched, the quenching surface is in a single direction, thereby reducing the difficulty of heat treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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.

[0028] Figure 1 Schematic diagram of the partial structure of the main bearing of the large-diameter tunnel boring machine provided in the embodiment of the present application Figure 1 ;

[0029] Figure 2 for Figure 1 Top view of the middle radial cage;

[0030] Figure 3 for Figure 1 Schematic diagram of the partial structure of the radial cage;

[0031] Figure 4 for Figure 1 Schematic diagram of the connection structure between the first outer ring and the main thrust retaining ring;

[0032] Figure 5 for Figure 1 Schematic diagram of the structure of the second outer ring;

[0033] Figure 6 for Figure 1 Schematic diagram of the structure of the third outer ring;

[0034] Figure 7 for Figure 1 Schematic diagram of the structure of the inner gear ring;

[0035] Figure 8 Schematic diagram of the partial structure of the main bearing of the large-diameter tunnel boring machine provided in the embodiment of the present application Figure 2 .

[0036] Description of reference numerals:

[0037] 100, outer ring assembly; 110, first outer ring; 120, second outer ring; 121, limiting groove; 122, main thrust retainer rib; 123, radial retainer guide surface; 124, auxiliary thrust retainer rib; 125, floating ring rib; 126, mounting hole; 130, third outer ring; 200, inner gear ring; 300, main thrust retainer ring; 400, main thrust roller assembly; 410, main thrust roller; 420, main thrust retainer; 500, auxiliary thrust roller assembly; 510, auxiliary thrust roller; 520, auxiliary thrust retainer; 530, floating part; 531, disc spring part; 532, floating ring; 600, radial roller assembly; 610, radial roller; 620, radial retainer; 621, pocket; 6211, straight hole section; 6212, V-shaped hole section.

[0038] 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

[0039] 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.

[0040] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0041] In this application, unless otherwise clearly specified and limited, the terms "installation", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] The roadheader is a high-precision assembly used for tunnel excavation, and the main bearing is its key core component. The main bearing mainly bears the huge complex alternating loads and overturning moments generated by the roadheader during excavation.

[0044] In the prior art, the main bearings of the tunnel boring machine are mainly three-row cylindrical roller bearings, in which the main thrust rollers are mainly used to bear the huge axial force, the radial rollers are used to bear the radial force, and the auxiliary thrust rollers are used to balance the overturning moment.

[0045] However, as the project requires, the diameter of the tunnel boring machine becomes larger and larger, and the diameter requirement of the main bearing also gradually increases; due to the large diameter of the main bearing, the diameter of the required raw material forging also increases accordingly. However, the process of large forgings is more complicated, the manufacturing is more difficult, the cost is higher, and there are fewer manufacturers that can make large-diameter forgings, so it is more difficult to purchase large-diameter forgings. In addition, the structural shapes of the various components of the main bearing with traditional structural design are irregular, so it is inevitable to remove some materials when processing the components, resulting in waste of resources and increased costs. At the same time, the irregular structural shape of the components also increases the difficulty of subsequent heat treatment. Once quenching deformation or quenching cracks occur, the components will be directly scrapped, causing great economic losses.

[0046] In order to solve the above problems, the present application provides a large-diameter tunnel boring machine main bearing and an assembly method. The large-diameter tunnel boring machine main bearing includes an outer ring assembly, an inner gear ring, a main thrust and retaining ring, a main thrust roller assembly, an auxiliary thrust roller assembly and a radial roller assembly; the outer ring assembly includes a first outer ring, a second outer ring and a third outer ring that are coaxially connected in sequence; thereby, the tunnel boring machine main bearing is decomposed into a bearing with a five-part structure, and the cross-section of each part structure is made more approximately rectangular, the processing of large-diameter rectangular cross-section forgings is simpler, less material is removed during the forging process, material utilization is improved, and the cost of forgings is reduced. At the same time, when the outer ring assembly is quenched in an approximately rectangular cross-section, the quenching surface is in a single direction, thereby reducing the difficulty of heat treatment.

[0047] 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.

[0048] On the one hand, the present application provides a main bearing for a large diameter tunnel boring machine, referring to Figures 1 to 8 The main bearing of the large-diameter tunnel boring machine includes an outer ring assembly 100, an inner gear ring 200, a main thrust retaining ring 300, a main thrust roller assembly 400, an auxiliary thrust roller assembly 500 and a radial roller assembly 600.

[0049] The outer ring assembly 100 includes a first outer ring 110, a second outer ring 120 and a third outer ring 130 which are coaxially connected in sequence. The first outer ring 110 is installed on the inner gear ring 200. The main thrust ring 300 is arranged on the side of the first outer ring 110 away from the second outer ring 120. The inner wall of the first outer ring 110, the outer wall of the inner gear ring 200, the side wall of the second outer ring 120 and the side wall of the main thrust ring 300 form a main thrust raceway, and the main thrust roller assembly 400 is installed in the main thrust raceway.

[0050] The second outer ring 120 is located on the side of the inner gear ring 200 , and a radial raceway is formed between the sidewall of the second outer ring 120 and the sidewall of the inner gear ring 200 . The radial roller assembly 600 is installed in the radial raceway.

[0051] The inner gear ring 200 is partially mounted on the third outer ring 130 , and an auxiliary thrust raceway is formed between the outer wall of the third outer ring 130 , the side wall of the second outer ring 120 and the inner wall of the inner gear ring 200 , and the auxiliary thrust roller assembly 500 is mounted in the auxiliary thrust raceway.

[0052] Specifically, the cross-sections of the first outer ring 110, the second outer ring 120, the third outer ring 130, the inner gear ring 200 and the main thrust ring 300 are all approximately rectangular. Thus, the main bearing of the tunnel boring machine is decomposed into five-part structures, and the cross-section of each part structure is more approximately rectangular, the processing of large-diameter rectangular cross-section forgings is simpler, less material is removed during the forging process, the material utilization rate is improved, and the cost of forgings is reduced. At the same time, when the outer ring assembly 100 is quenched in an approximately rectangular cross-section, the quenching surface is in a single direction, thereby reducing the difficulty of heat treatment.

[0053] In addition, during the main bearing maintenance and renovation process, if a single split structure is damaged, the replacement cost is lower, effectively improving the feasibility of remanufacturing.

[0054] The main thrust roller assembly 400 includes a main thrust roller 410 and a main thrust retainer 420 for mounting the main thrust roller 410. One side of the main thrust retainer 420 contacts the second outer ring 120, and the other side maintains a certain gap with the main thrust retainer ring 300. The main thrust roller 410 is mounted in the main thrust retainer 420, and the two sides of the main thrust roller 410 abut against the inner wall of the first outer ring 110 and the outer wall of the inner gear ring 200, respectively.

[0055] Reference Figure 1 and Figure 4 The main push and retaining ring 300 is fixed to the side wall of the first outer ring 110 by bolts. There is a gap between the main push and retaining ring 300 and the inner gear ring 200 to avoid hindering the rotation of the inner gear ring 200. A sealing strip is installed on the outer wall of the inner gear ring 200 to seal the gap between the main push and retaining ring 300 and the inner gear ring 200.

[0056] Therefore, there is no need to provide an oil groove on the outer ring, thereby eliminating the risk of quenching cracks occurring in the oil groove of the original first outer ring 110 .

[0057] Through holes for pin connection are provided between the first outer ring 110, the second outer ring 120 and the third outer ring 130, and an annular boss and an annular groove are provided at the ends of the through holes. The annular boss is inserted into the annular groove to play a positioning role. The annular groove and the annular boss are stoppers for the first outer ring 110, the second outer ring 120 and the third outer ring 130. The stoppers of the first outer ring 110 and the third outer ring 130 are matched with the stoppers of the second outer ring 120 respectively.

[0058] Furthermore, sealing rings are provided on both sides of the stoppers of the first outer ring 110 and the second outer ring 120. Sealing rings are also provided on both sides of the stoppers of the second outer ring 120 and the third outer ring 130 to seal the connection of the outer ring assembly 100.

[0059] In some embodiments, reference Figure 1 and Figure 5The radial roller assembly 600 includes a radial roller 610 and a radial retainer 620 for mounting the radial roller 610 . A limiting groove 121 is provided on the side wall of the second outer ring 120 . Part of the radial roller 610 protrudes from the radial retainer 620 , and the protruding part of the radial roller 610 is embedded in the limiting groove 121 .

[0060] The limiting groove 121 is an annular groove provided on the side wall of the second outer ring 120. The central axis of the radial roller 610 is perpendicular to the central axis of the second outer ring 120, and the thickness of the radial retainer 620 is smaller than the diameter of the radial roller 610, so that after the radial roller 610 is installed on the radial retainer 620, the radial roller 610 partially protrudes outside the radial retainer 620, and the protruding portion of the radial roller 610 is embedded in the limiting groove 121 and is rotatably connected to the limiting groove 121.

[0061] The depth of the limiting groove 121 is preferably 1 / 6 of the diameter of the radial roller 610 , so that the radial roller 610 stands on the side wall of the limiting groove 121 when the radial roller 610 is assembled without falling off.

[0062] By adopting the above technical solution, when the radial roller 610 is embedded in the limiting groove 121, the end wall of the limiting groove 121 abuts against the end of the radial roller 610, thereby limiting the radial roller 610 from falling from the limiting groove 121; when installing the radial roller assembly 600, the radial roller 610 is placed in the limiting groove 121, and the radial retaining frame 620 is installed on the radial roller 610, so as to keep the radial roller assembly 600 connected to the second outer ring 120, thereby preventing the radial tube assembly from falling or deviating from the second outer ring 120.

[0063] In some embodiments, reference Figure 1 , Figure 2 and Figure 3 A plurality of pockets 621 are evenly distributed on the radial retainer 620 , and the radial rollers 610 are arranged in the pockets 621 in a one-to-one correspondence. The opening width of the pockets 621 on the side away from the second outer ring 120 is smaller than the diameter of the radial rollers 610 .

[0064] By adopting the above technical solution, the radial rollers 610 are placed in the pockets 621 in a one-to-one correspondence and are rotatably connected with the pockets 621. When the radial rollers 610 are placed in the pockets 621, both sides of the radial rollers 610 can partially protrude outside the pockets 621 to facilitate the rotation of the radial rollers 610. In addition, the opening width of one side of the pockets 621 is smaller than the diameter of the radial rollers 610, thereby limiting the radial rollers 610 from falling off from the pockets 621, thereby preventing the radial rollers 610 from falling off radially from the radial retainer 620 during installation and use.

[0065] In addition, the pocket 621 transitions from the side with a larger width to the side with a smaller width, so that the pocket 621 has a certain oil storage effect and can better provide lubrication for the radial roller 610. The pocket 621 has a better positioning effect than a straight hole and can improve the running stability of the radial roller 610.

[0066] In some embodiments, the pocket hole 621 includes a straight hole section 6211 and a V-shaped hole section 6212, the V-shaped hole section 6212 is connected to the straight hole section 6211, the width of the straight hole section 6211 is greater than the diameter of the radial roller 610, and the width of the V-shaped hole section 6212 at one end away from the straight hole section 6211 is less than the diameter of the radial roller 610.

[0067] When the radial roller 610 is placed in the pocket 621, the central axis of the radial roller 610 is located in the straight hole section 6211, which is conducive to placing the radial roller 610 in the pocket 621. The diameter of the straight hole section 6211 is larger than the diameter of the radial roller 610, which is convenient for placing the radial roller 610 in the pocket 621. The V-shaped hole section 6212 limits the possibility of the radial roller 610 falling from the pocket 621, and the contact between the radial roller 610 and the side wall of the V-shaped hole section 6212 is a line contact, thereby reducing the contact area, reducing the influence of the friction between the radial roller 610 and the hole wall of the pocket 621 on the rotation of the radial roller 610, and changing the normal collision force and tangential friction force between the radial roller 610 and the wall of the pocket 621, thereby improving stability.

[0068] Exemplarily, the V-shaped hole segment 6212 may also be replaced by a circular arc hole segment.

[0069] In some embodiments, there is a gap b between the side wall of the V-shaped hole segment 6212 and the radial roller 610, and 0.2 mm≤b≤1 mm.

[0070] By adopting the above technical solution, there is a gap b between the side wall of the V-shaped hole section 6212 and the radial roller 610, and when the radial roller 610 is running, it only contacts the wall of the pocket hole 621 on one side, thereby preventing the radial roller 610 from getting stuck in the pocket hole 621. At the same time, the gap between the side wall of the V-shaped hole section 6212 and the radial roller 610 is conducive to the storage of lubricating oil between the pocket hole 621 and the radial roller 610, thereby improving the lubrication effect of the radial roller 610.

[0071] Furthermore, the gap b between the side wall of the V-shaped hole section 6212 and the radial roller 610 is preferably 0.5 mm. Maintaining a reasonable gap can prevent the radial roller 610 from getting stuck and from shaking too much in the pocket 621, causing damage to the pocket 621 wall or the radial roller 610.

[0072] In some embodiments, the angle between the side wall of the V-shaped hole segment 6212 and the central axis of the V-shaped hole segment 6212 is c, and 25°≤c≤45°.

[0073] Reasonable setting of the side wall angle of the V-shaped hole section 6212 can better achieve the limiting and oil storage effects. A larger angle is likely to cause excessive restriction on the radial roller 610, which is not conducive to the rotation of the radial roller 610 and is likely to cause damage to the surface of the pocket 621; however, a smaller angle is not conducive to limiting the radial roller 610 and is not conducive to oil storage in the pocket 621.

[0074] Furthermore, the angle c between the side wall of the V-shaped hole segment 6212 and the central axis of the V-shaped hole segment 6212 is preferably 35°.

[0075] In some embodiments, the thickness of the radial retainer 620 is greater than the radius of the radial roller 610 and smaller than the diameter of the radial roller 610 .

[0076] By adopting the above technical solution, the reasonable thickness of the radial retainer 620 can not only meet the stiffness requirements of the radial retainer 620 to avoid damage to the radial roller 610 during operation, but also prevent interference with the radial roller 610 during subsequent assembly of the inner gear ring 200 to damage the radial raceway.

[0077] Furthermore, the thickness of the radial retainer 620 is preferably 3 / 5 of the diameter of the radial roller 610 .

[0078] In some embodiments, reference Figure 1 , Figure 6 and Figure 7 The auxiliary thrust roller assembly 500 includes an auxiliary thrust roller 510, an auxiliary thrust retainer 520 and a floating member 530. The auxiliary thrust roller 510 is installed on the auxiliary thrust retainer 520. The floating member 530 is arranged on the outer wall of the third outer ring 130 and contacts the auxiliary thrust roller 510 to provide a floating distance for the auxiliary thrust roller 510.

[0079] Specifically, the inner gear ring 200 has a convex ring on one side close to the second outer ring 120, so that the cross section of the inner gear ring 200 is L-shaped. The auxiliary thrust roller assembly 500 is installed at the corner of the L-shaped inner ring of the inner gear ring 200. A plurality of placement grooves are evenly distributed on the auxiliary thrust retainer 520, and the placement grooves penetrate the auxiliary thrust retainer 520. The auxiliary thrust rollers 510 are installed in the placement grooves one by one. The central axis of the auxiliary thrust roller 510 is parallel to the central axis of the third outer ring 130, and the floating member 530 is installed on the outer wall of the third outer ring 130; one side of the auxiliary thrust roller 510 contacts the floating member 530, and the other side contacts the inner wall of the inner gear ring 200. One side of the auxiliary thrust retainer 520 abuts against the side wall of the second outer ring 120, and the other side abuts against the side wall of the inner gear ring 200. The auxiliary thrust raceway is formed by the inner wall of the inner gear ring 200 , the side wall of the inner gear ring 200 , the outer wall of the third outer ring 130 , and the side wall of the second outer ring 120 .

[0080] In some embodiments, the floating member 530 includes a disc spring member 531 and a floating ring 532. A mounting groove is opened on the third outer ring 130. The disc spring member 531 is arranged in the mounting groove. The floating ring 532 is installed on the third outer ring 130 and contacts with the disc spring member 531. The auxiliary thrust retaining frame 520 is installed on the floating ring 532.

[0081] There are multiple mounting grooves, which are evenly distributed on the outer wall of the third outer ring 130. The disc spring members 531 are arranged in the mounting grooves one by one. The floating ring 532 is installed on the third outer ring 130, and the inner wall of the floating ring 532 abuts against the disc spring member 531, so that the disc spring member 531 supports the floating ring 532. The auxiliary thrust retainer 520 is installed on the floating ring 532, so that the auxiliary thrust roller 510 is placed on the outer wall of the floating ring 532. The disc spring member 531 can provide a preload force to balance the overturning moment generated by the main bearing, so as to extend the service life of the auxiliary thrust roller assembly 500.

[0082] The second outer ring 120 has a main thrust retainer rib 122, a radial retainer guide surface 123, a limiting groove 121, an auxiliary thrust retainer rib 124, and a floating ring rib 125 on one side close to the inner gear ring 200. The main thrust retainer 420 abuts against the main thrust retainer rib 122; the radial retainer 620 abuts against the radial retainer guide surface 123; the radial roller 610 is partially embedded in the limiting groove 121, and the end of the radial roller 610 abuts against the side wall of the limiting groove 121; the auxiliary thrust retainer 520 abuts against the auxiliary thrust retainer rib 124; and the floating ring 532 abuts against the floating ring rib 125. Different step surfaces are provided on the side wall of the second outer ring 120 to abut and limit different components, so as to improve the effect of limiting and fixing. Although a plurality of step surfaces are arranged on the side surface of the second outer ring 120 , when the second outer ring 120 is quenched, the quenched surface is subjected to single radial quenching, thereby avoiding the multi-directional deformation problem caused by the complex quenched surface.

[0083] Exemplary, combined Figure 1 , Figure 5 and Figure 8 As shown at A in the figure, the main push retainer rib 122 and the radial retainer guide surface 123 can also be set to the same plane. At this time, the thickness of the main push retainer 420 is changed so that the radial retainer 620 can be smoothly placed in the gap between the second outer ring 120 and the inner gear ring 200.

[0084] Exemplary, combined Figure 1 , Figure 5 and Figure 8 As shown in B in the figure, a mounting hole 126 can also be opened on the side of the second outer ring 120, and the mounting hole 126 is connected to the limiting groove 121. The length of the mounting hole 126 is 0.5 mm longer than the length of the radial roller 610. The mounting hole 126 is a tapered hole. A plug for sealing the mounting hole 126 is also provided on the mounting hole 126, and the plug is made of the same material as the second outer ring 120. During the processing of the limiting groove 121, the mounting hole 126 is formed by synchronous processing to ensure the integrity of the limiting groove 121. During assembly, the second outer ring 120, the radial retainer 620 and the inner gear ring 200 are assembled first; then the plug is removed, and the radial roller 610 is placed from the mounting hole 126 into the limiting groove 121, so that the radial roller 610 is assembled into the radial retainer 620, and all the radial rollers 610 are assembled into the radial retainer 620 by rotating while assembling.

[0085] On the other hand, the present application provides a method for assembling a main bearing of a large-diameter tunnel boring machine, which is used to assemble a main bearing of a large-diameter tunnel boring machine. The assembly method comprises the following steps:

[0086] 1. Install the second outer ring 120 on the third outer ring 130 and ensure that the axes of the second outer ring 120 and the third outer ring 130 coincide with each other.

[0087] First, place the third outer ring 130 stably, and then install the second outer ring 120 on the third outer ring 130 so that the stopper of the second outer ring 120 matches the stopper of the third outer ring 130 and ensure that the axis of the second outer ring 120 coincides with the axis of the third outer ring 130 .

[0088] 2. Install the auxiliary thrust roller assembly 500 on the outer wall of the third outer ring 130 and press it against the side wall of the second outer ring 120 .

[0089] Assemble the disc spring component 531 in the installation groove of the third outer ring 130; install the floating ring 532 on the disc spring component 531 of the third outer ring 130, and make the axis of the floating ring 532 coincide with the axis of the third outer ring 130, at this time, the side of the floating ring 532 is close to the floating ring rib 125 of the second outer ring 120; install the auxiliary thrust retainer 520 on the floating ring 532, and the outer side wall of the auxiliary thrust retainer 520 should be close to the auxiliary thrust retainer rib 124 of the second outer ring 120; install the auxiliary thrust roller 510 in the auxiliary thrust retainer 520; the auxiliary thrust roller 510 should be gently placed in the corresponding hole position of the auxiliary thrust retainer 520 to prevent it from falling due to its own weight and causing damage to the auxiliary thrust raceway.

[0090] 3. Install the radial roller assembly 600 on the radial raceway of the side wall of the second outer ring 120 .

[0091] Place the radial roller 610 into the limiting groove 121 so that the rolling surface of the radial roller 610 is in close contact with the limiting groove 121 of the second outer ring 120. At this time, the side wall of the limiting groove 121 prevents the radial roller 610 from falling off. Then place the radial retainer 620 so that the hole wall of the V-shaped hole section 6212 of the radial retainer 620 is in close contact with the rolling surface of the radial roller 610, and then hang the radial retainer 620 on the radial roller 610.

[0092] 4. Install the inner gear ring 200 on the auxiliary thrust roller assembly 500 , and make the side wall of the inner gear ring 200 tightly abut against the radial roller assembly 600 .

[0093] The inner gear ring 200 is placed so that the axis of the inner gear ring 200 coincides with the axis of the third outer ring 130 to avoid interference with other components; the inner wall of the inner gear ring 200 abuts against the auxiliary thrust roller 510, and the side wall of the inner gear ring 200 abuts against the radial roller 610.

[0094] 5. Install the main push roller assembly 400 on the inner gear ring 200 and press it against the side wall of the second outer ring 120 .

[0095] The outer side of the main push retainer 420 is in close contact with the main push retainer rib 122 of the second outer ring 120 to avoid interference between the main push retainer 420 and the main push retainer 300 during subsequent assembly of the first outer ring 110 and the main push retainer 300, thereby causing damage to the main push retainer 420, the main push roller 410 and the main push retainer 300; then the main push roller 410 is placed in the main push retainer 420, and the main push roller 410 should be placed gently in the main push retainer 420 to prevent it from falling by its own weight and causing damage to the main push raceway; wherein, the main push rollers 410 are generally in two rows, and collisions with each other should be avoided when they are placed to avoid damaging the rolling surfaces of the main push rollers 410.

[0096] 6. Install the main thrust retaining ring 300 onto the side wall of the first outer ring 110 .

[0097] 7. Install the first outer ring 110 on the second outer ring 120 and ensure that the axes of the first outer ring 110 and the third outer ring 130 coincide with each other, and the main thrust retaining ring 300 and the main thrust roller assembly 400 are tightly pressed against each other.

[0098] The present application provides an assembly method for a main bearing of a large-diameter tunnel boring machine, which decomposes the main bearing of the tunnel boring machine into a bearing with a five-part structure, and makes the cross-section of each part structure more approximately rectangular, so that the processing of large-diameter rectangular cross-section forgings is simpler, less material is removed during the forging process, the material utilization rate is improved, the forging cost is reduced, and the cost of scrapping and re-material in the processing process is lower; and after a single structure is damaged, the replacement cost is lower; at the same time, when the outer ring assembly 100 with an approximately rectangular cross-section is quenched, the quenching surface is in a single direction, thereby reducing the difficulty of heat treatment.

[0099] Those skilled in the art will readily come up with other embodiments of the present application after considering the specification and practicing the present application. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary technical means in the art that are not disclosed in the present application.

[0100] 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 for a large diameter tunnel boring machine, characterized in that: It comprises an outer ring assembly (100), an inner gear ring (200), a main thrust retaining ring (300), a main thrust roller assembly (400), an auxiliary thrust roller assembly (500) and a radial roller assembly (600); The outer ring assembly (100) comprises a first outer ring (110), a second outer ring (120) and a third outer ring (130) which are coaxially connected in sequence, the first outer ring (110) being mounted on the inner gear ring (200), the main thrust ring (300) being arranged on a side of the first outer ring (110) away from the second outer ring (120), the inner wall of the first outer ring (110), the outer wall of the inner gear ring (200), the side wall of the second outer ring (120) and the side wall of the main thrust ring (300) forming a main thrust raceway, and the main thrust roller assembly (400) being mounted in the main thrust raceway; The second outer ring (120) is located on the side of the inner gear ring (200), a radial raceway is formed between the side wall of the second outer ring (120) and the side wall of the inner gear ring (200), and the radial roller assembly (600) is installed in the radial raceway; The inner gear ring (200) is partially installed on the third outer ring (130), and an auxiliary thrust raceway is formed between the outer wall of the third outer ring (130), the side wall of the second outer ring (120) and the inner wall of the inner gear ring (200), and the auxiliary thrust roller assembly (500) is installed in the auxiliary thrust raceway.

2. The main bearing of a large-diameter tunnel boring machine according to claim 1, characterized in that: The radial roller assembly (600) comprises a radial roller (610) and a radial retaining frame (620) for mounting the radial roller (610); a limiting groove (121) is provided on the side wall of the second outer ring (120); a portion of the radial roller (610) protrudes from the radial retaining frame (620), and the protruding portion of the radial roller (610) is embedded in the limiting groove (121).

3. The main bearing of a large diameter tunnel boring machine according to claim 2, characterized in that: The radial retaining frame (620) is evenly provided with a plurality of pockets (621), and the radial rollers (610) are arranged in the pockets (621) in a one-to-one correspondence, and the opening width of the pockets (621) on the side away from the second outer ring (120) is smaller than the diameter of the radial rollers (610).

4. The main bearing of a large-diameter tunnel boring machine according to claim 3, characterized in that: The pocket hole (621) comprises a straight hole section (6211) and a V-shaped hole section (6212), the V-shaped hole section (6212) being connected to the straight hole section (6211), the width of the straight hole section (6211) being greater than the diameter of the radial roller (610), and the width of the V-shaped hole section (6212) at one end away from the straight hole section (6211) being less than the diameter of the radial roller (610).

5. The main bearing of a large diameter tunnel boring machine according to claim 4, characterized in that: There is a gap b between the side wall of the V-shaped hole section (6212) and the radial roller (610), and the gap is 0.2mm≤b≤1mm.

6. The main bearing of a large diameter tunnel boring machine according to claim 4, characterized in that: The angle between the side wall of the V-shaped hole segment (6212) and the central axis of the V-shaped hole segment (6212) is c, 25°≤c≤45°.

7. The main bearing of a large diameter tunnel boring machine according to claim 2, characterized in that: The thickness of the radial retainer (620) is greater than the radius of the radial roller (610) and smaller than the diameter of the radial roller (610).

8. The main bearing of a large diameter tunnel boring machine according to any one of claims 1 to 7, characterized in that: The auxiliary thrust roller assembly (500) comprises an auxiliary thrust roller (510), an auxiliary thrust retainer (520) and a floating member (530); the auxiliary thrust roller (510) is mounted on the auxiliary thrust retainer (520); the floating member (530) is arranged on the outer wall of the third outer ring (130) and contacts the auxiliary thrust roller (510) to provide a floating distance for the auxiliary thrust roller (510).

9. The main bearing of a large-diameter tunnel boring machine according to claim 8, characterized in that: The floating component (530) includes a disc spring component (531) and a floating ring (532). The third outer ring (130) is provided with a mounting groove, and the disc spring component (531) is arranged in the mounting groove. The floating ring (532) is installed on the third outer ring (130) and contacts the disc spring component (531). The auxiliary thrust retainer (520) is installed on the floating ring (532).

10. A method for assembling a main bearing of a large diameter tunnel boring machine, characterized in that: For assembling the main bearing of a large-diameter tunnel boring machine according to any one of claims 1 to 9, the assembly method comprises the following steps: Installing the second outer ring (120) on the third outer ring (130), and ensuring that the axes of the second outer ring (120) and the third outer ring (130) coincide with each other; The auxiliary thrust roller assembly (500) is mounted on the outer wall of the third outer ring (130) and is tightly pressed against the side wall of the second outer ring (120); Installing a radial roller assembly (600) on the radial raceway of the side wall of the second outer ring (120); Installing the inner gear ring (200) on the auxiliary thrust roller assembly (500) so that the side wall of the inner gear ring (200) is tightly pressed against the radial roller assembly (600); The main push roller assembly (400) is installed on the inner gear ring (200) and is tightly pressed against the side wall of the second outer ring (120); Installing the main thrust retaining ring (300) onto the side wall of the first outer ring (110); The first outer ring (110) and the main thrust ring (300) are installed on the second outer ring (120), and it is ensured that the axes of the first outer ring (110) and the third outer ring (130) coincide with each other.

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