A main bearing of a heading machine

Abstract

The application discloses a main bearing of a heading machine, which comprises a retainer assembly, ball rollers, an inner ring and an outer ring; wherein the inner ring and the outer ring are sequentially provided with a main pushing raceway, an auxiliary pushing raceway and a radial raceway; the main pushing raceway is provided with M rows of raceway surfaces in parallel; the auxiliary pushing raceway is provided with N rows of raceway surfaces; the radial raceway is provided with O rows of raceway surfaces; M is greater than N; M, N and O are natural numbers; N and O are greater than or equal to 1; the retainer assembly comprises a first retainer, a second retainer and a third retainer; the retainers are all provided with arc-shaped pockets for positioning the ball rollers; the thicknesses of the first retainer, the second retainer and the third retainer are all 0.1-0.98 times of the diameters of the corresponding ball rollers. The application realizes the lightweight design of the inner ring and the outer ring by arranging the ball rollers and the corresponding retainers in the main bearing, reduces the weight of the main bearing and improves the load capacity of the main bearing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of main bearing of heading machine, and discloses a main bearing of heading machine. BACKGROUND

[0002] The main bearing of heading machine belongs to low-speed heavy load bearing, is the core component of heading machine under the load of bad working condition of breaking rock, and has high bearing capacity requirement. The main bearing of heading machine (bearing outer diameter size Φ3m-Φ7.6m) has large diameter, heavy weight, high precision requirement, and the main bearing product needs to consume huge manpower and material resources in the process of transportation and installation, so that the lightweight design of the main bearing can facilitate hoisting and transfer, reduce transportation cost, avoid transportation deformation and the like.

[0003] Patent No. CN110925296A discloses a kind of lightweight bearing, solve the problem of large friction force of ball, retainer and inner and outer ring in prior art.A kind of lightweight bearing, including outer ring and inner ring, the opposite side of inner ring and outer ring is provided with arc-shaped groove, a plurality of evenly distributed balls are arranged between two arc-shaped grooves, two symmetrically distributed retainers are arranged between outer ring and inner ring, two retainers are located on the two sides of ball, lubrication channel is formed in the inner part of outer ring, the top of one ball is provided with lubricating mechanism, the arc-shaped groove in outer ring is communicated with lubrication channel through lubricating mechanism.The ball is relatively rotated in arc-shaped groove, lubricating oil is driven to lubricate ball and arc-shaped groove, effectively reduce the friction force of ball and arc-shaped groove, effectively prolong the service life of bearing, meet the requirement of low-speed rotation of bearing.But the design of the above-mentioned retainer cannot meet the assembly requirement of ball type roller of main bearing of heading machine, and cannot solve the lightweight problem of main bearing of heading machine.

[0004] In summary, there is an urgent need for a lightweight main bearing of heading machine that can assemble ball type roller to solve the problems in the prior art. SUMMARY

[0005] The present application aims to provide a kind of main bearing of heading machine, and the specific technical solutions are as follows:

[0006] A kind of main bearing of heading machine, characterized in that it comprises a retainer assembly, a ball type roller, an inner ring and an outer ring.

[0007] Specifically, the inner ring and the outer ring are sequentially provided with a main push raceway, an auxiliary push raceway and a radial raceway, the main push raceway is provided with M rows of raceway surfaces side by side, the auxiliary push raceway is provided with N rows of raceway surfaces, and the radial raceway is provided with O rows of raceway surfaces, M is greater than N, and M, N and O are natural numbers, N and O are greater than or equal to 1.

[0008] Specifically, the retainer assembly comprises a first retainer, a second retainer and a third retainer, the first retainer is arranged corresponding to the main thrust raceway and is provided with pockets for accommodating the spherical rollers and corresponding to the raceway surface of the main thrust raceway; the second retainer is provided with pockets for accommodating the spherical rollers and corresponding to the raceway surface of the auxiliary thrust raceway; the third retainer is provided with pockets for accommodating the spherical rollers and corresponding to the raceway surface of the radial raceway; the thickness of the first retainer, the second retainer and the third retainer is 0.1-0.98 times of the diameter of the corresponding spherical roller.

[0009] Further, the raceway surface is a spherical groove structure matching the spherical roller; the maximum cross-sectional angle of the spherical groove structure is α, and the expression of α is as follows:

[0010] α=k*arcsin(d / D);

[0011] Wherein, k is the raceway load coefficient, the value range of k is 0-0.98; d is the thickness of the retainer; D is the radius of the spherical roller.

[0012] Preferably, the first retainer, the second retainer and the third retainer are symmetrically arranged along the central axis of the corresponding spherical roller.

[0013] Further, the first retainer, the second retainer and the third retainer are circular ring retainers, and the circular ring retainers are provided with a first guide block and a second guide block corresponding to the first guide block.

[0014] Preferably, the annular surface of the first retainer is provided with two rows of arc-shaped pockets in the radial direction of the main bearing, and the two rows of arc-shaped pockets are outer circle arc-shaped pockets and inner circle arc-shaped pockets respectively; the main thrust raceway is provided with two rows of raceway surfaces; the first guide block is arranged on the outer wall of the retainer, and the second guide block is arranged on the inner wall of the retainer.

[0015] Preferably, the number of the outer circle arc-shaped pockets is greater than or equal to the number of the inner circle arc-shaped pockets, and the outer circle arc-shaped pockets and the inner circle arc-shaped pockets are arranged in radial interval or adjacent correspondence.

[0016] Preferably, the annular surface of the second retainer is provided with one row of arc-shaped pockets, and the auxiliary thrust raceway is provided with one row of raceway surfaces; the first guide block is arranged on the outer wall of the retainer, and the second guide block is arranged on the inner wall of the retainer.

[0017] Preferably, the radial surface of the third retainer is provided with one row of arc-shaped pockets, and the first guide block is arranged on the outer wall of the retainer, and the second guide block is arranged on the inner wall of the retainer.

[0018] The technical scheme of the application has the following beneficial effects:

[0019] The raceway surface of the spherical groove structure in the application can improve the main bearing load; the maximum load of the main bearing can be adjusted by adjusting the contact angle of the ball contact type roller, different diameter main bearings can be adapted without changing the roller diameter, and the optimal contact angle can be designed according to actual needs, which is beneficial to realize the lightweight design of the main bearing.

[0020] The cage in the application is designed in one piece, has good stability, and the arc-shaped pockets for positioning the ball type rollers are designed on the cage, so that the assembly of the ball type rollers can be better realized.

[0021] The ball type roller in the application is better lubricated than the cylindrical roller, can use lubricating grease and the like for lubrication, does not need to be soaked in lubricating oil, and the overall weight of the main bearing is also reduced; the roller needs full quenching in the processing and manufacturing of the main bearing, as the excavation diameter of the tunneling machine increases, the diameter of the main bearing also increases accordingly, the required bearing capacity is enhanced, the diameter of the cylindrical roller in the prior art increases as the bearing demand of the main bearing increases, and the larger cylindrical roller is not easy to quench; the maximum load of the main bearing can be adjusted by adjusting the contact angle of the ball type roller, and the diameter of the roller can not be increased, so that the problem of difficult quenching of the large diameter roller is solved.

[0022] In addition to the purposes, features and advantages described above, the application has other purposes, features and advantages. The application will be further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application, and are incorporated in and constitute a part of this application. The embodiments of the application illustrated in the drawings, and their description, are used to explain the application and are not intended to limit the application. In the drawings:

[0024] Figure 1 is an axial sectional view of the main bearing of the tunneling machine;

[0025] Figure 2 is a top view of the main push cage (the number of arc-shaped pockets of the outer ring is greater than that of the inner ring);

[0026] Figure 3 is a top view of the main push cage (the number of arc-shaped pockets of the outer ring is equal to that of the inner ring);

[0027] Figure 4 is a top view of the auxiliary push cage;

[0028] Figure 5 is a top view of the radial cage.

[0029] Wherein, 1-main push cage inner guide block, 2-main push cage outer guide block, 3-main push cage body, 4-main push ball roller, 5-radial cage outer guide block, 6-radial ball roller, 7-radial cage body, 8-radial cage inner guide block, 9-secondary push cage outer guide block, 10-secondary push cage inner guide block, 11-secondary push cage body, 12-secondary push ball roller, 13-first outer ring, 14-second outer ring, 15-inner ring. DETAILED DESCRIPTION

[0030] The embodiments of the present application will be described in detail below with reference to the accompanying drawings, but the present application can be implemented in various different ways as defined and covered by the claims.

[0031] The embodiment realizes a main bearing of a heading machine, and details are shown in Figure 1 , including a cage assembly, a ball roller, an inner ring 15 and an outer ring.

[0032] Specifically, the inner ring 15 and the outer ring are sequentially provided with a main push raceway, a secondary push raceway and a radial raceway, the main push raceway is provided with M rows of raceway surfaces side by side, the secondary push raceway and the radial raceway are each provided with N rows of raceway surfaces, M is greater than N and M and N are natural numbers, and N is greater than or equal to 1.

[0033] Specifically, the cage assembly includes a first cage, a second cage and a third cage, the first cage is provided corresponding to the main push raceway and is provided with pockets for accommodating the ball roller and corresponding to the raceway surfaces on the main push raceway; the second cage is provided with pockets for accommodating the ball roller and corresponding to the raceway surfaces on the secondary push raceway; the third cage is provided with pockets for accommodating the ball roller and corresponding to the raceway surfaces on the radial raceway; the thicknesses of the first cage, the second cage and the third cage are each 0.1-0.98 times the diameter of the corresponding ball roller.

[0034] Further, the ball roller and the raceway surface can be in point contact or surface contact, and the greater the contact surface is, the stronger the load bearing capacity of the main bearing is.

[0035] Further, the raceway surface is a spherical groove structure matched with the ball roller; the maximum cross-sectional angle of the spherical groove structure is α, and the expression of α is as follows:

[0036] α=k*arcsin(d / D);

[0037] Wherein, k is a raceway load coefficient, the value range of k is 0-0.98; d is the thickness of the cage; D is the radius of the ball roller.

[0038] Further, the greater the α, the stronger the load capacity of the retainer, and the size of α can be adjusted according to the requirement of the raceway load, thereby reducing the thickness of the main bearing and achieving the lightweight of the main bearing of the tunneling machine, which is beneficial to transportation.

[0039] Preferably, the first retainer, the second retainer and the third retainer are symmetrically arranged along the central axis of the corresponding ball rollers.

[0040] Further, the first retainer, the second retainer and the third retainer are circular ring retainers, and the circular ring retainers are provided with first guide blocks and second guide blocks corresponding to the first guide blocks.

[0041] It should be noted that the arc-shaped pockets are used for positioning when installing the ball rollers, and do not engage the ball rollers, that is, there is no interference fit between the arc-shaped pockets and the ball rollers; for example, the diameter of the circular pocket is 1 mm larger than that of the ball roller, and assuming that the diameter of the ball roller is 90 mm, the diameter of the circular pocket is 91 mm.

[0042] Further, the retainer in the embodiment is a one-piece retainer, which is more stable than the split retainers of the main bearing of the tunneling machine in the prior art, and the load capacity is also improved to a certain extent; compared with the split retainers in the prior art, the one-piece retainer structure is stable.

[0043] The preferred retainer of the embodiment includes a main push retainer, an auxiliary push retainer and a radial retainer, and the three retainers are the three retainers required by the main bearing of the tunneling machine.

[0044] As shown in Figure 2 and Figure 3 , in the main push retainer, the main push retainer body 3 is a circular ring retainer, the first guide block is a main push retainer outer guide block 2, and the second guide block is a main push retainer inner guide block 1; two rows of arc-shaped pockets are arranged on the annular surface, that is, M is equal to 2, the main push retainer outer guide block 2 is arranged on the outer wall of the retainer, and the main push retainer inner guide block 1 is arranged on the inner wall of the retainer.

[0045] Preferably, the number of the outer ring arc-shaped pockets is greater than or equal to the number of the inner ring arc-shaped pockets, and the outer ring arc-shaped pockets and the inner ring arc-shaped pockets are arranged in a radial interval or adjacent correspondence.

[0046] Further, since the main push retainer mainly bears the radial load caused by the first outer ring 13 and the inner ring 15, which is the main load in the main bearing of the tunneling machine, two rows of arc-shaped pockets are designed for installing two rows of ball rollers, so that the main push retainer can bear the radial load caused by the first outer ring 13 and the inner ring 15.

[0047] Specifically, asFigure 4 As shown, in the auxiliary push retainer, the auxiliary push retainer body 11 is an annular retainer, the first guide block is the outer guide block 9 of the auxiliary push retainer, and the second guide block is the inner guide block 10 of the auxiliary push retainer; a row of arc-shaped pockets is provided on the annular surface of the retainer body, that is, N equals 1; the outer guide block 9 of the auxiliary push retainer is provided on the outer wall of the retainer, and the inner guide block 10 of the auxiliary push retainer is provided on the inner wall of the retainer.

[0048] Specifically, such as Figure 5 As shown, in the radial retainer, the radial retainer body 7 is an annular retainer, the first guide block is the radial retainer outer guide block 5, and the second guide block is the radial retainer inner guide block 8; a row of arc-shaped pockets is provided on the radial surface of the retainer body, i.e., O equals 1; the radial retainer outer guide block 5 and the radial retainer inner guide block 8 are correspondingly arranged on the outer wall and inner wall of the radial retainer.

[0049] The ball rollers described in this embodiment include a main push ball roller 4, an auxiliary push ball roller 12, and a radial ball roller 6.

[0050] In this embodiment, the outer ring is a split outer ring, including a first outer ring 13 and a second outer ring 14. A main push cage and a main push ball roller 4, as well as a radial cage and a radial ball roller 6, are provided between the first outer ring 13 and the inner ring 15. An auxiliary push cage and an auxiliary push ball roller 12 are provided between the second outer ring 14 and the inner ring 15.

[0051] This embodiment discloses a main bearing for a tunneling machine, including a cage assembly, ball rollers, an inner ring, and an outer ring. The inner and outer rings are sequentially provided with a main thrust raceway, an auxiliary thrust raceway, and a radial raceway. The main thrust raceway has M rows of raceway surfaces arranged side-by-side, the auxiliary thrust raceway has N rows of raceway surfaces, and the radial raceway has O rows of raceway surfaces. M is greater than N, and M, N, and O are natural numbers, with N and O being greater than or equal to 1. The cage assembly includes a first cage, a second cage, and a third cage, each cage having arc-shaped pockets for positioning the ball rollers. The thickness of the first, second, and third cages is 0.1-0.98 times the diameter of the corresponding ball roller. This invention achieves a lightweight design for the inner and outer rings by incorporating ball rollers and corresponding cages in the main bearing, reducing the weight of the main bearing and increasing its load-bearing capacity.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A main bearing of a heading machine, characterized in that, The cage assembly, the spherical roller, the inner ring and the outer ring are included. The inner ring and the outer ring are sequentially provided with a main pushing raceway, an auxiliary pushing raceway and a radial raceway, the main pushing raceway is provided with M rows of raceway surfaces in parallel, the auxiliary pushing raceway is provided with N rows of raceway surfaces, and the radial raceway is provided with O rows of raceway surfaces, M is greater than N, M, N and O are natural numbers, and N and O are greater than or equal to 1. The cage assembly includes a first cage, a second cage and a third cage, the first cage is provided corresponding to the main pushing raceway and is provided with pockets for accommodating the spherical roller and corresponding to the raceway surfaces of the main pushing raceway, the second cage is provided with pockets for accommodating the spherical roller and corresponding to the raceway surfaces of the auxiliary pushing raceway, and the third cage is provided with pockets for accommodating the spherical roller and corresponding to the raceway surfaces of the radial raceway, and the thicknesses of the first cage, the second cage and the third cage are 0.1-0.98 times of the diameters of the corresponding spherical rollers.

2. The main bearing of a heading machine according to claim 1, characterized in that The raceway surfaces of the main pushing raceway, the auxiliary pushing raceway and the radial raceway are all spherical groove structures matched with the spherical rollers, the maximum cross-section included angle of the spherical groove structure is α, and the expression of α is as follows: α=k*arcsin(d / D); wherein, k is a raceway load coefficient, the value range of k is 0-0.98, d is the cage thickness, and D is the radius of the spherical roller.

3. The main bearing of a heading machine according to claim 1, characterized in that The first cage, the second cage and the third cage are symmetrically arranged along the central axes of the corresponding spherical rollers.

4. The main bearing of a heading machine according to claim 1, characterized in that, The first cage, the second cage and the third cage are circular ring cages, the circular ring cages are provided with first guide blocks and second guide blocks corresponding to the first guide blocks.

5. The main bearing of a heading machine according to claim 4, characterized in that Two rows of arc-shaped pockets are arranged in the radial direction of the main bearing on the annular surface of the first cage, and the two rows of arc-shaped pockets are outer ring arc-shaped pockets and inner ring arc-shaped pockets respectively, the main pushing raceway is provided with two rows of raceway surfaces, the first guide blocks are arranged on the outer wall of the cage, and the second guide blocks are arranged on the inner wall of the cage.

6. The main bearing of a heading machine according to claim 5, characterized in that The number of the outer ring arc-shaped pockets is greater than or equal to the number of the inner ring arc-shaped pockets, and the outer ring arc-shaped pockets and the inner ring arc-shaped pockets are radially spaced or adjacently arranged.

7. The main bearing of a heading machine according to claim 6, characterized in that The first guide blocks are arranged close to the outer ring arc-shaped pockets, and the second guide blocks are arranged close to the inner ring arc-shaped pockets.

8. The main bearing of a heading machine according to claim 4, characterized in that One row of arc-shaped pockets is arranged on the annular surface of the second cage, the auxiliary pushing raceway is provided with one row of raceway surfaces, the first guide blocks are arranged on the outer wall of the cage, and the second guide blocks are arranged on the inner wall of the cage.

9. The main bearing of a heading machine according to claim 4, characterized in that One row of arc-shaped pockets is arranged on the radial surface of the third cage, the first guide blocks are arranged on the outer wall of the cage, and the second guide blocks are arranged on the inner wall of the cage.

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