A main bearing of a large-diameter tunneling machine and an assembly method thereof

Abstract

This application relates to the technical field of tunneling machines, and particularly to a main bearing for a large-diameter tunneling machine and an assembly method thereof. The main bearing of the large-diameter tunneling machine includes an outer ring assembly, an internal gear ring, a main thrust 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. A main thrust raceway is formed by enclosing between the inner wall of the first outer ring, the outer wall of the internal gear ring, the side wall of the second outer ring, and the side wall of the main thrust retaining ring, and the main thrust roller assembly is installed in the main thrust raceway; a radial raceway is formed between the side wall of the second outer ring and the side wall of the internal gear ring, and the radial roller assembly is installed in the radial raceway; an auxiliary thrust raceway is formed by enclosing between the outer wall of the third outer ring, the side wall of the second outer ring, and the inner wall of the internal gear ring, and the auxiliary thrust roller assembly is installed in the auxiliary thrust raceway. The main bearing of the large-diameter tunneling machine in this application reduces the difficulty of subsequent manufacturing and heat treatment.

Description

Technical Field

[0001] This application relates to the technical field of roadheaders, and particularly to a main bearing of a large-diameter roadheader and an assembly method thereof. Background Art

[0002] A roadheader is a high-precision and sophisticated assembly 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 during the excavation of the roadheader.

[0003] In the prior art, the main bearing of a roadheader is mainly a three-row cylindrical roller bearing. Among them, the main thrust rollers are mainly used to bear the extremely large 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 roadheader is getting larger and larger, and the diameter requirement of the main bearing also gradually increases. Moreover, the structural shapes of the components of the main bearing with 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] This application provides a main bearing of a large-diameter roadheader and an assembly method thereof, which are used to solve the problem that the manufacturing and heat treatment are more difficult due to the irregular structural shape of the main bearing of the large-diameter roadheader.

[0006] On the one hand, this application provides a main bearing of a large-diameter roadheader, which includes an outer ring assembly, an internal 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 includes a first outer ring, a second outer ring, and a third outer ring that are coaxially connected in sequence. The first outer ring is installed on the internal gear ring. The main thrust retaining ring is arranged on the side of the first outer ring away from the second outer ring. A main thrust raceway is formed by enclosing between the inner wall of the first outer ring, the outer wall of the internal gear ring, the side wall of the second outer ring, and the side wall of the main thrust retaining ring. The main thrust roller assembly is installed in the main thrust raceway;

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

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

[0010] In some embodiments, the radial roller assembly includes radial rollers and a radial cage for mounting the radial rollers. A limiting groove is formed in the side wall of the second outer ring. The radial rollers protrude partially from the radial cage, and the protruding portions of the radial rollers are fitted in the limiting groove.

[0011] In some embodiments, a plurality of pocket holes are uniformly formed in the radial cage. The radial rollers are correspondingly arranged in the pocket holes one by one. The opening width of the pocket hole on the side away from the second outer ring is smaller than the diameter of the radial roller.

[0012] In some embodiments, the pocket hole includes a straight hole section and a V-shaped hole section. The V-shaped hole section is communicated with the straight hole section. The width of the straight hole section is greater than the diameter of the radial roller. The width of the end of the V-shaped hole section away from the straight hole section is smaller 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 section and the radial roller, and 0.2 mm ≤ b ≤ 1 mm.

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

[0015] In some embodiments, the thickness of the radial cage 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 auxiliary thrust rollers, an auxiliary thrust cage, and a floating member. The auxiliary thrust rollers are mounted on the auxiliary thrust cage. The floating member is arranged on the outer wall of the third outer ring and contacts the auxiliary thrust rollers to provide a floating distance for the auxiliary thrust rollers.

[0017] In some embodiments, the floating member includes a disc spring member and a floating ring. An installation groove is formed in the third outer ring. The disc spring member is arranged in the installation groove. The floating ring is mounted on the third outer ring and contacts the disc spring member. The auxiliary thrust cage is mounted on the floating ring.

[0018] On the other hand, the present application provides an assembly method for a main bearing of a large-diameter tunneling machine, which is used to assemble the main bearing of the large-diameter tunneling machine as described above. The assembly method includes 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;

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

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

[0022] Install the internal gear ring on the auxiliary thrust roller assembly and make the side wall of the internal gear ring abut against the radial roller assembly;

[0023] Install the main thrust roller assembly on the internal gear ring and abut it against the side wall of the second outer ring;

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

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

[0026] A main bearing for a large-diameter tunneling machine and an assembly method provided by the present application. The main bearing of the large-diameter tunneling machine includes an outer ring assembly, an internal gear ring, a main thrust 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. Thus, the main bearing of the tunneling machine is decomposed into a bearing with a five-piece structure, and the cross-section of each piece structure is more approximately rectangular. The forging of the large-diameter rectangular cross-section forging is simpler, less material is removed during the forging process, the material utilization rate is improved, and the forging cost is reduced. At the same time, when the outer ring assembly is quenched with an approximately rectangular cross-section, the quenching surface is in a single direction, thereby reducing the difficulty of heat treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present application and used together with the specification to explain the principles of the present application.

[0028] Figure 1 It is a schematic view of a partial structure of the main bearing of the large-diameter tunneling machine provided by the embodiment of the present application Figure 1 ;

[0029] Figure 2 is Figure 1 a top view of the radial cage in

[0030] Figure 3 is Figure 1 a partial structural schematic view of the radial cage in

[0031] Figure 4 is Figure 1 a schematic view of the connection structure between the first outer ring and the main thrust retaining ring in

[0032] Figure 5 is Figure 1 a schematic view of the structure of the second outer ring in

[0033] Figure 6 isFigure 1 Schematic structural diagram of the third outer ring;

[0034] Figure 7 is Figure 1 Schematic structural diagram of the internal gear ring;

[0035] Figure 8 Partial structural schematic of the main bearing of the large-diameter tunneling machine provided by the embodiment of the present application Figure 2 .

[0036] Explanation of reference numerals:

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

[0038] Through the above-mentioned drawings, specific embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and text descriptions are not intended to limit the scope of the concept 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. Specific Embodiments

[0039] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, 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 only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0041] In this application, unless otherwise clearly defined and limited, terms such as "installation", "connection", "fixation", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or communicable with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] In this application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature can be 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, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0043] A roadheader is a high-precision and advanced 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 during the excavation of the roadheader.

[0044] In the prior art, the main bearings of roadheaders are mainly three-row cylindrical roller bearings, where the main thrust rollers are mainly used to bear the extremely large 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, with the needs of the project, the diameter of the roadheader is getting larger and larger, and the diameter requirement of the main bearing is also gradually increasing; due to the large diameter of the main bearing, the diameter of the required raw material forgings also increases accordingly. The process of large forgings is more complex, the manufacturing is more difficult, the cost is higher, and there are fewer manufacturers that can produce large-diameter forgings, so it is more difficult to purchase large-diameter forgings. And the structural shapes of the components of the main bearing designed with the traditional structure 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 shapes of the components also increase the difficulty of subsequent heat treatment. Once quenching deformation or quenching cracks occur, it will lead to the direct scrapping of the components, 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 internal gear ring 200, and the main thrust retaining ring 300 are all approximately rectangular. Thus, the main bearing of the roadheader is decomposed into a five-piece structure, and the cross-section of each piece structure is made more approximate to a rectangle. The forging of large-diameter rectangular cross-section forgings is simpler, less material is removed during the forging process, the material utilization rate is increased, the forging cost is reduced. At the same time, when the outer ring assembly 100 is quenched with an approximate rectangular cross-section, the quenching surface is in a single direction, thereby reducing the difficulty of heat treatment.

[0053] In addition, during the repair and transformation of the main bearing, when a single piece structure is damaged, the replacement cost is lower, effectively improving the feasibility of remanufacturing.

[0054] The main thrust roller assembly 400 includes main thrust rollers 410 and a main thrust cage 420 for mounting the main thrust rollers 410. One side of the main thrust cage 420 is in contact with the second outer ring 120, and there is a certain gap between the other side and the main thrust retaining ring 300. The main thrust rollers 410 are installed in the main thrust cage 420, and both sides of the main thrust rollers 410 are in contact with the inner wall of the first outer ring 110 and the outer wall of the internal gear ring 200 respectively.

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

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

[0057] Through holes for pin shaft connection are provided between the first outer ring 110, the second outer ring 120, and the third outer ring 130. And at the end of the through hole, there are also an annular boss and an annular groove. The annular boss is inserted into the annular groove to play a positioning role. This annular groove and annular boss are the stop mouths of the first outer ring 110, the second outer ring 120, and the third outer ring 130. The stop mouth of the first outer ring 110 and the stop mouth of the third outer ring 130 are respectively matched with the stop mouth of the second outer ring 120.

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

[0059] In some embodiments, refer to Figure 1 and Figure 5, the radial roller assembly 600 includes radial rollers 610 and a radial cage 620 for mounting the radial rollers 610. A limiting groove 121 is formed in the side wall of the second outer ring 120. The radial rollers 610 protrude partially from the radial cage 620, and the protruding portions of the radial rollers 610 are fitted into the limiting groove 121.

[0060] Among them, the limiting groove 121 is an annular groove formed in 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. The thickness of the radial cage 620 is less than the diameter of the radial roller 610. After the radial roller 610 is mounted on the radial cage 620, the radial roller 610 protrudes partially from the radial cage 620, and the protruding portion of the radial roller 610 is fitted into the limiting groove 121 and is rotatably connected within 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 during the assembly of the radial roller 610 without falling off.

[0062] By adopting the above technical solution, when the radial roller 610 is fitted into the limiting groove 121, the end wall of the limiting groove 121 abuts against the end of the radial roller 610, thereby restricting the radial roller 610 from falling out of the limiting groove 121; when installing the radial roller assembly 600, the radial roller 610 is placed into the limiting groove 121, and then the radial cage 620 is mounted on the radial roller 610, so that the radial roller assembly 600 can be connected to the second outer ring 120, avoiding the radial tube assembly from falling off or shifting from the second outer ring 120.

[0063] In some embodiments, referring to Figure 1 、 Figure 2 and Figure 3 , a plurality of pocket holes 621 are evenly formed in the radial cage 620, and the radial rollers 610 are correspondingly arranged in the pocket holes 621. The opening width of the pocket hole 621 on the side away from the second outer ring 120 is less than the diameter of the radial roller 610.

[0064] By adopting the above technical solution, the radial rollers 610 are correspondingly placed in the pocket holes 621 and are rotatably connected to the pocket holes 621. When the radial rollers 610 are placed in the pocket holes 621, both sides of the radial rollers 610 can partially protrude outside the pocket holes 621 to facilitate the rotation of the radial rollers 610. Moreover, the opening width of one side of the pocket hole 621 is less than the diameter of the radial roller 610, thereby restricting the radial roller 610 from falling out from this side of the pocket hole 621, thus avoiding the radial detachment of the radial roller 610 from the radial cage 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 section 6212 and the central axis of the V-shaped hole section 6212 is c, and 25° ≤ c ≤ 45°.

[0073] By reasonably setting the side wall angle of the V-shaped hole section 6212, better limiting and oil storage effects can be achieved. If the angle is too large, it is easy 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, if the angle is too small, it is not conducive to limiting the radial roller 610 and is also not conducive to oil storage in the pocket 621.

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

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

[0076] By adopting the above technical solution, the reasonable thickness of the radial cage 620 not only meets the stiffness requirements of the radial cage 620 to avoid damage to the radial cage 620 during the operation of the radial roller 610, but also prevents interference with the radial raceway during the subsequent assembly of the internal gear ring 200 and damage to the radial roller.

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

[0078] In some embodiments, referring to Figure 1 、 Figure 6 and Figure 7 , the auxiliary thrust roller assembly 500 includes an auxiliary thrust roller 510, an auxiliary thrust cage 520, and a floating member 530. The auxiliary thrust roller 510 is installed on the auxiliary thrust cage 520. The floating member 530 is disposed 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, one side of the internal gear ring 200 close to the second outer ring 120 has a convex ring, so that the cross-section of the internal 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 internal gear ring 200. A plurality of placement grooves are evenly arranged on the auxiliary thrust cage 520, and the placement grooves penetrate through the auxiliary thrust cage 520. The auxiliary thrust rollers 510 are correspondingly 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 internal gear ring 200. One side of the auxiliary thrust cage 520 abuts against the side wall of the second outer ring 120, and the other side abuts against the side wall of the internal gear ring 200. An auxiliary thrust raceway is formed by jointly enclosing the inner wall of the internal gear ring 200, the side wall of the internal 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. An installation groove is provided on the third outer ring 130. The disc spring member 531 is arranged in the installation groove. The floating ring 532 is installed on the third outer ring 130 and contacts the disc spring member 531. The auxiliary thrust cage 520 is installed on the floating ring 532.

[0081] There are a plurality of installation grooves, and the plurality of installation grooves are evenly arranged on the outer wall of the third outer ring 130. The disc spring members 531 are correspondingly arranged in the installation 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 cage 520 is installed on the floating ring 532, so that the auxiliary thrust rollers 510 are placed on the outer wall of the floating ring 532. The disc spring member 531 can provide a pre-tightening 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] On one side of the second outer ring 120 close to the internal gear ring 200, there are successively a main thrust cage rib 122, a radial cage guide surface 123, a limiting groove 121, an auxiliary thrust cage rib 124, and a floating ring rib 125. Among them, the main thrust cage 420 abuts against the main thrust cage rib 122; the radial cage 620 abuts against the radial cage guide surface 123; part of the radial roller 610 is 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 cage 520 abuts against the auxiliary thrust cage rib 124; the floating ring 532 abuts against the floating ring rib 125. Different stepped surfaces are arranged 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 there are multiple stepped surfaces on the side of the second outer ring 120, when the second outer ring 120 is quenched, the quenching surface is a single radial quenching, which can avoid the multi-directional deformation problem caused by a complex quenching surface.

[0083] Exemplarily, as shown at position A in Figure 1 、 Figure 5 and Figure 8 , the main thrust cage rib 122 and the radial cage guide surface 123 can also be set to the same plane. At this time, the thickness of the main thrust cage 420 is changed so that the radial cage 620 can be smoothly placed into the gap between the second outer ring 120 and the internal gear ring 200.

[0084] Exemplarily, as shown at position B in Figure 1 、 Figure 5 and Figure 8 , an installation hole 126 can also be opened on the side of the second outer ring 120. The installation hole 126 communicates with the limiting groove 121, and the length of the installation hole 126 is 0.5 mm larger than the length of the radial roller 610. The installation hole 126 is a tapered hole. A plug for sealing the installation hole 126 is also arranged on the installation 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 installation hole 126 is synchronously processed to ensure the integrity of the limiting groove 121. During assembly, first assemble the second outer ring 120, the radial cage 620, and the internal gear ring 200; then take out the plug, place the radial roller 610 into the limiting groove 121 from the installation hole 126, so as to assemble the radial roller 610 into the radial cage 620. By rotating while assembling, all the radial rollers 610 are assembled into the radial cage 620.

[0085] On the other hand, the present application provides an assembly method for the main bearing of a large-diameter tunneling machine, which is used for assembling the main bearing of a large-diameter tunneling machine. The assembly method includes 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.

[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 rabbet of the second outer ring 120 matches the rabbet 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 tightly against the side wall of the second outer ring 120.

[0089] Assemble the disc spring part 531 in the installation groove of the third outer ring 130; install the floating ring 532 on the disc spring part 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 surface of the floating ring 532 is in close contact with the floating ring stop edge 125 of the second outer ring 120; install the auxiliary thrust cage 520 on the floating ring 532, and the outer side wall of the auxiliary thrust cage 520 should be in close contact with the auxiliary thrust cage stop edge 124 of the second outer ring 120; assemble the auxiliary thrust roller 510 in the auxiliary thrust cage 520; the auxiliary thrust roller 510 should be gently placed into the corresponding hole position of the auxiliary thrust cage 520 to prevent damage to the auxiliary thrust raceway due to falling by its own weight.

[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 limit groove 121 so that the rolling surface of the radial roller 610 is in close contact with the limit groove 121 of the second outer ring 120. At this time, the side wall of the limit groove 121 blocks the radial roller 610 from falling off; then place the radial cage 620 so that the hole wall of the V-shaped hole section 6212 of the radial cage 620 is in close contact with the rolling surface of the radial roller 610, and then hang the radial cage 620 on the radial roller 610.

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

[0093] Place the internal gear ring 200 so that the axis of the internal gear ring 200 coincides with the axis of the third outer ring 130 to avoid interference with other components; the inner wall of the internal gear ring 200 is in contact with the auxiliary thrust roller 510, and the side wall of the internal gear ring 200 is in close contact with the radial roller 610.

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

[0095] The outer side of the main thrust cage 420 is closely attached to the main thrust cage rib 122 of the second outer ring 120 to prevent interference between the main thrust cage 420 and the main thrust retaining ring 300 during the subsequent assembly of the first outer ring 110 and the main thrust retaining ring 300, which may cause damage to the main thrust cage 420, the main thrust rollers 410, and the main thrust retaining ring 300. Then, place the main thrust rollers 410 into the main thrust cage 420. The main thrust rollers 410 should be gently placed into the main thrust cage 420 to prevent damage to the main thrust raceway caused by falling due to their own weight. Generally, there are two rows of main thrust rollers 410, and when placing them, care should be taken to avoid collision with each other, which may damage the rolling surfaces of the main thrust rollers 410.

[0096] 6. Install the main thrust retaining ring 300 on 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, and the main thrust retaining ring 300 abuts against the main thrust roller assembly 400.

[0098] An assembly method for the main bearing of a large-diameter tunneling machine provided by this application decomposes the main bearing of the tunneling machine into a bearing with a five-piece structure, and makes the cross-section of each piece structure more approximate to a rectangle. The processing of large-diameter rectangular-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 replacing defective materials during the processing is lower. Also, when a single structure is damaged, the replacement cost is lower. At the same time, when the outer ring assembly 100 is quenched with an approximate rectangular cross-section, the quenching surface is in a single direction, thereby reducing the difficulty of heat treatment.

[0099] Those skilled in the art will readily think of other embodiments of this application after considering the specification and practicing this application. This application is intended to cover any variations, uses, or adaptations of this application, which follow the general principles of this application and include the common general knowledge or conventional technical means in this technical field that are not disclosed in this application.

[0100] It should be understood that this application is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is only limited 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 mounted on the third outer ring (130), 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; The radial roller assembly (600) comprises a radial roller (610) and a radial retainer (620) for mounting the radial roller (610); the radial retainer (620) is evenly provided with a plurality of pockets (621); the radial rollers (610) are arranged in the pockets (621) in a one-to-one correspondence; the pockets (621) comprise 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); There is a gap b between the side wall of the V-shaped hole section (6212) and the radial roller (610), 0.2mm≤b≤1mm; the angle between the side wall of the V-shaped hole section (6212) and the central axis of the V-shaped hole section (6212) is c, 25°≤c≤45°.

2. The main bearing of a large-diameter tunnel boring machine according to claim 1, characterized in that: 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 opening width of the pocket hole (621) on the side away from the second outer ring (120) is smaller than the diameter of the radial roller (610).

4. The main bearing of a large diameter tunnel boring machine according to claim 1, 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).

5. The main bearing of a large diameter tunnel boring machine according to any one of claims 1 to 4, 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).

6. The main bearing of a large-diameter tunnel boring machine according to claim 5, 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).

7. 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 6, 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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