Drum-shaped sliding bearing type shield hob

Abstract

The utility model relates to the technical field of tunnel shield machine hobs, in particular to a drum-shaped sliding bearing type shield hob which comprises a hob shaft, a lower end cover and an upper end cover which are distributed in parallel are arranged on the hob shaft in a sleeved mode, a hob hub is arranged between the lower end cover and the upper end cover, and a drum-shaped sliding bearing of a drum-shaped structure is embedded in the hob hub. The cutter hub is arranged on the cutter shaft in a sleeving manner through a drum-shaped sliding bearing, the drum-shaped sliding bearing is in interference fit with the cutter hub and is in clearance fit with the cutter shaft, and a cutter ring is arranged on the outer side of the cutter hub in a sleeving manner; and floating seals are arranged between the lower end cover and the cutter hub as well as between the upper end cover and the cutter hub. According to the utility model, the drum-shaped sliding bearing is adopted, so that the shield hob is easy to start in a soft rock stratum, and the eccentric wear risk does not exist; meanwhile, the impact resistance is improved, the risk of impact failure of the shield hob in a high-impact stratum is reduced, the service life of the shield hob is prolonged, and then the tunneling efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of tunnel shield machine rolling cutter, specifically relates to a drum-shaped sliding bearing type shield rolling cutter. BACKGROUND

[0002] The shield machine is a tunnel boring machine using the shield method, which is a highly automated large-scale special mechanical equipment for tunnels, can safely and quickly excavate tunnels, and is widely used in subway, railway, highway, municipal, water and electricity and other tunnel projects, wherein the disc-shaped rolling cutter is a key component directly contacting the rock in front of the cutter head of the shield machine, directly affecting the tunneling efficiency and cost of the shield tunnel project.

[0003] The prior art shield rolling cutter mostly uses a tapered roller bearing as a rotary support, the tapered roller bearing is expensive, and the frequency of abnormal failure of the rolling cutter is high under adverse working conditions, the rolling cutter of the tapered roller bearing is insufficient in counterforce in soft rock strata due to pre-tightening, which causes difficulty in starting the bearing and easy to cause eccentric wear of the rolling cutter; in high impact strata such as uneven soft and hard strata, fractured zones and solution development strata, the bearing is impacted and fails, and the rolling cutter is easily damaged; the sliding bearing does not need to adjust the torque, is easier to start, and has no risk of eccentric wear. For example, the Chinese utility model patent with the authorized announcement number CN214944259U discloses a new sliding bearing rolling cutter for a shield machine, which solves the problem of eccentric wear and failure of the rolling cutter by using a flanged sliding bearing, and the Chinese utility model patent with the authorized announcement number CN218376457U discloses a shield machine speed-reducing bearing rolling cutter, which solves the problem of eccentric wear and failure of the rolling cutter by using a combination of a shaft sleeve and a thrust washer. Although the above-mentioned patents solve the problem of eccentric wear and failure of the rolling cutter, they have insufficient impact resistance and have the risk of cracking of the bearing root and the thrust washer. SUMMARY

[0004] The utility model discloses to solve the problem of eccentric wear and impact failure of the shield rolling cutter under adverse working conditions of the prior art, and provides a drum-shaped sliding bearing type shield rolling cutter, which uses a drum-shaped sliding bearing to make the shield rolling cutter easy to start in soft rock strata and have no risk of eccentric wear, improve the impact resistance, reduce the risk of impact failure of the shield rolling cutter in high impact strata, improve the service life of the shield rolling cutter, and further improve the efficiency of tunneling.

[0005] In order to achieve the above object, the technical scheme of the utility model is: a drum-shaped sliding bearing type shield cutter, including cutter shaft, the lower end cover and upper end cover are arranged in parallel on the cutter shaft, the cutter hub is arranged between the lower end cover and the upper end cap, the inside of the cutter hub is inlaid with the drum-shaped sliding bearing of drum-shaped structure. The drum-shaped sliding bearing of drum-shaped structure can bear radial force and axial force simultaneously, improve stress concentration phenomenon, have automatic alignment function, thereby improve the impact resistance, reduce the risk of shield cutter impact failure.

[0006] The cutter hub is sleeved on the cutter shaft through the drum-shaped sliding bearing, the drum-shaped sliding bearing is interference fit with the cutter hub and clearance fit with the cutter shaft, and the cutter hub is sleeved with a cutter ring on the outside; floating seals are arranged between the lower end cover, the upper end cover and the cutter hub. The drum-shaped sliding bearing is clearance fit with the cutter shaft, so that the shield cutter is easy to start in soft rock stratum; the floating seals can meet the sealing requirements of the internal structure of the shield cutter.

[0007] Further, one end of the cutter shaft is provided with a shaft shoulder, the lower end cover is matched and attached to the shaft shoulder, and the lower end cover is interference fit with the cutter shaft and is installed on the cutter shaft through the shaft shoulder.

[0008] Further, a recessed groove is formed in the outside of the upper end cover, one end of the cutter shaft is provided with a locking nut matched with the recessed groove, the upper end cover is attached to the drum-shaped sliding bearing, and the locking nut fixes the upper end cover, so as to fix the entire shield cutter structure.

[0009] Further, an O-shaped sealing ring one is arranged between the shaft shoulder and the lower end cover, and an O-shaped sealing ring two is arranged between the locking nut and the upper end cover. The O-shaped sealing ring one seals the shaft shoulder and the lower end cover, and the O-shaped sealing ring two seals the locking nut and the upper end cover.

[0010] Further, arc-shaped grooves are symmetrically formed in the inside of the cutter hub, the drum-shaped sliding bearing is inlaid in the inside of the cutter hub through the arc-shaped grooves, and the cross-sectional width of the drum-shaped sliding bearing gradually increases from left to right and from right to left. The arc-shaped grooves provide installation positions for the drum-shaped sliding bearing, so as to embed the drum-shaped sliding bearing into the cutter hub, and the drum-shaped sliding bearing adopts a symmetrical design structure and has an error prevention effect.

[0011] Further, a plurality of through holes are arranged on the drum-shaped sliding bearing, and graphite blocks are inlaid in the through holes. The graphite blocks inlaid on the drum-shaped sliding bearing realize self-lubrication of the drum-shaped sliding bearing, so that the shield cutter is more easy to start in soft rock stratum.

[0012] Further, the right side of the cutter ring is provided with a retaining ring, the retaining ring is clamped on the cutter hub to limit the axial movement of the cutter ring, and the retaining ring can limit the axial movement of the cutter ring.

[0013] Further, the lower end cover and the upper end cover are both provided with oil plugs, the number of the oil plugs on the lower end cover is one, and the number of the oil plugs on the upper end cover is two, lubricating oil can be injected into the inside of the shield cutter at the oil plugs, the sliding bearing is further lubricated and cooled, and the sliding bearing can be ensured to operate in good conditions.

[0014] By the above technical scheme, the drum-shaped sliding bearing type shield cutter has the following beneficial effects:

[0015] The drum-shaped sliding bearing type shield cutter has the advantages of reasonable structure and good use effect, the shield cutter is easy to start in soft rock stratum by adopting the drum-shaped sliding bearing mode, and there is no risk of eccentric wear; meanwhile, the impact resistance is improved, the risk of impact failure of the shield cutter in high impact stratum is reduced, the frequency of checking and replacing the shield cutter is reduced, the service life of the shield cutter is improved, the efficiency of tunneling is improved, and the cost of shield construction is reduced.

[0016] The drum-shaped sliding bearing is embedded into the cutter hub, the drum-shaped sliding bearing adopts a symmetrical design structure, has an error-proof function, and is in clearance fit with the cutter shaft, so that the shield cutter is easy to start in soft rock stratum and has no risk of eccentric wear; meanwhile, the graphite blocks embedded on the drum-shaped sliding bearing are used to realize self-lubrication of the drum-shaped sliding bearing, lubricating oil is injected into the inside of the shield cutter, the drum-shaped sliding bearing is further lubricated and cooled, and the drum-shaped sliding bearing can be ensured to operate in good conditions, so that the shield cutter is more easy to start in soft rock stratum.

[0017] The drum-shaped sliding bearing adopts a drum-shaped design structure, can bear radial force and axial force at the same time, the drum-shaped structure of the drum-shaped sliding bearing can improve the stress concentration phenomenon, has an automatic alignment function, has strong adaptability to installation errors and bending deformation of the shaft, has strong bearing capacity of radial and axial loads, the drum-shaped design can reduce stress concentration sensitivity, the impact resistance is significantly increased in soft and hard uneven stratum, fracture zone, solution cavity and other high impact stratum, the use of shield cutter parts can be improved, the service life is improved, and the risk of impact failure of the shield cutter in high impact stratum is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 is a structural schematic view of a drum-shaped sliding bearing type shield cutter;

[0019] Fig. 2 is a structural schematic view of a cutter hub.

[0020] The attached diagram is labeled as follows: 1 is the cutter shaft, 2 is the shoulder, 3 is the lower end cover, 4 is the cutter hub, 5 is the cutter ring, 6 is the retaining ring, 7 is the upper end cover, 8 is the lock nut, 9 is the drum-shaped sliding bearing, 10 is the floating seal, 11 is the oil plug, 12 is the O-ring one, 13 is the O-ring two, and 14 is the arc-shaped groove. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0022] like Figs. 1-2 As shown, a drum-shaped sliding bearing type shield cutterhead includes a cutter shaft 1. A lower end cover 3 and an upper end cover 7 are mounted side-by-side on the cutter shaft 1. A cutter hub 4 is positioned between the lower end cover 3 and the upper end cover 7. A drum-shaped sliding bearing 9 with a drum-like structure is embedded inside the cutter hub 4. In this embodiment, the lower end cover 3 and the upper end cover 7 are located on both sides of the cutter hub 4, and grooves for mounting the lower end cover 3 and the upper end cover 7 are respectively opened on both sides of the cutter hub 4. The drum-shaped sliding bearing 9 with a drum-like structure can simultaneously withstand radial and axial forces, improving stress concentration, providing self-aligning functionality, enhancing impact resistance, and reducing the risk of shield cutterhead impact failure.

[0023] The cutter hub 4 is mounted on the cutter shaft 1 via a drum-shaped sliding bearing 9. The drum-shaped sliding bearing 9 has an interference fit with the cutter hub 4 and a clearance fit with the cutter shaft 1. A cutter ring 5 is fitted on the outer side of the cutter hub 4. Floating seals 10 are provided between the lower end cover 3 and the upper end cover 7 and the cutter hub 4. In this embodiment, the drum-shaped sliding bearing 9 and the clearance fit between the drum-shaped sliding bearing 9 and the cutter shaft 1 facilitate the start-up of the shield cutter head in soft rock formations, reducing the risk of uneven wear of the shield cutter head. The floating seals 10 achieve the sealing requirements of the internal structure of the shield cutter head.

[0024] One end of the cutter shaft 1 is provided with a shoulder 2, and the lower end cover 3 is fitted and disposed on the shoulder 2, with the lower end cover 3 and the cutter shaft 1 having an interference fit. In this embodiment, the shoulder 2 on the cutter shaft 1 facilitates the installation of the lower end cover 3 onto the cutter shaft 1.

[0025] The upper end cover 7 has a concave groove on its outer side, and one end of the cutter shaft 1 is provided with a locking nut 8 that matches the concave groove. The upper end cover 7 is fitted with the drum-shaped sliding bearing 9. In this embodiment, the locking nut 8 is located in the concave groove, and the upper end cover 7 is fixed by the locking nut 8 to achieve the purpose of fixing the entire shield cutter head structure.

[0026] An O-shaped sealing ring one 12 is arranged between the shaft shoulder 2 and the lower end cover 3; an O-shaped sealing ring two 13 is arranged between the locking nut 8 and the upper end cover 7. In the embodiment, the O-shaped sealing ring one 12 seals the shaft shoulder 2 and the lower end cover 3; the locking nut 8 has an annular groove on the outside, and the O-shaped sealing ring two 13 is located in the annular groove, so that the locking nut 8 and the upper end cover 7 are sealed by the O-shaped sealing ring two 13.

[0027] An arc-shaped slot 14 is symmetrically arranged on the inner side of the cutter hub 4, and the drum-shaped sliding bearing 9 is embedded in the cutter hub 4 through the arc-shaped slot 14; the cross-sectional width of the drum-shaped sliding bearing 9 gradually increases from left to right and from right to left. In the embodiment, the arc-shaped slot 4 provides a mounting position for the drum-shaped sliding bearing 9 and limits the drum-shaped sliding bearing 9; the cross-sectional width of the drum-shaped sliding bearing 9 gradually increases from left to right and from right to left, so that the drum-shaped sliding bearing 9 has a symmetrical design structure and an error-proofing effect.

[0028] A plurality of through holes are arranged on the drum-shaped sliding bearing 9, and graphite blocks are embedded in the through holes. In the embodiment, the graphite blocks are made of graphite material, so that the drum-shaped sliding bearing 9 is self-lubricated and easier to start, and the shield cutter is easier to start in soft rock stratum, and the risk of eccentric wear is reduced.

[0029] A retaining ring 6 is arranged on the right side of the cutter ring 5, and the retaining ring 6 is clamped on the cutter hub 4 to limit the axial movement of the cutter ring 5. In the embodiment, the retaining ring 6 is welded and fixed on the cutter ring 5, and the retaining ring 6 can limit the axial movement of the cutter ring 5.

[0030] Oil plugs 11 are arranged on the lower end cover 3 and the upper end cover 7, and the number of the oil plugs 11 on the lower end cover 3 is one, and the number of the oil plugs 11 on the upper end cover 7 is two. In the embodiment, oil holes are arranged on the lower end cover 3 and the upper end cover 7, and the oil plugs 11 are installed in the oil holes, and the number of the oil holes on the lower end cover 3 is one, and the number of the oil holes on the upper end cover 7 is two; oil grooves are arranged on the side of the lower end cover 3 and the upper end cover 7 corresponding to the drum-shaped sliding bearing 9; during the rock breaking of the shield cutter, lubricating oil can be injected into the shield cutter through the oil plugs 11, so that the drum-shaped sliding bearing 9 is further lubricated and cooled, and the drum-shaped sliding bearing 9 is easier to start.

[0031] The utility model discloses a lower end cover 3 is installed on the cutter shaft 1 through the shaft shoulder 2, and installs the floating seal 10 in the inside of lower end cover 3, then the drum-shaped sliding bearing 9 is sleeved in the cutter hub 4, then the cutter hub 4 is sleeved on the cutter shaft 1 through the drum-shaped sliding bearing 9, then the floating seal 10 is also installed on the right side of cutter hub 4, then the upper end cover 7 is sleeved on the cutter shaft 1, and the locking nut 8 is installed on the right end of cutter shaft 1 to fix the upper end cover 7, wherein the cutter ring 5 is sleeved on the outside of cutter hub 4, and the retaining ring 6 is installed on the right side of cutter ring 5, and the retaining ring 6 is fixed on the cutter hub 4.

[0032] The utility model discloses low in cost, and the assembly process is simple, and through drum-shaped sliding bearing 9, it is convenient to start in soft rock stratum, and there is no eccentric wear risk, and drum-shaped sliding bearing 9 adopts drum-shaped design structure, has good automatic aligning function, and has strong adaptability to the installation error of shaft, bending deformation condition, and the bearing radial and axial load capacity is stronger, and drum-shaped design can reduce stress concentration sensitivity, and in soft and hard uneven, fracture zone, solution cave etc. high impact stratum, impact resistance is increased significantly, can improve the use of shield cutter spare parts, improve its service life, solve the problem that shield is easy to eccentric wear and impact failure under the adverse condition in the prior art.

[0033] The above-mentioned embodiments are only preferred embodiments of the utility model, and do not limit the scope of the utility model, so that equivalent changes or modifications of the technical solutions in the utility model patent range should be included in the utility model application patent range.

Claims

1. A drum-shaped sliding bearing type shield cutter comprising a cutter shaft (1), characterized in that, The lower end cover (3) and the upper end cover (7) are arranged on the cutter shaft (1) in parallel, the cutter hub (4) is arranged between the lower end cover (3) and the upper end cover (7), and the drum-shaped sliding bearing (9) in a drum-shaped structure is embedded in the inside of the cutter hub (4). The cutter hub (4) is sleeved on the cutter shaft (1) through the drum-shaped sliding bearing (9), the drum-shaped sliding bearing (9) is in interference fit with the cutter hub (4) and in clearance fit with the cutter shaft (1), and the cutter hub (4) is sleeved with the cutter ring (5) on the outside; the floating seal (10) is arranged between the lower end cover (3), the upper end cover (7) and the cutter hub (4).

2. A drum-shaped sliding bearing type shield cutter according to claim 1, characterized in that, One end of the cutter shaft (1) is provided with the shaft shoulder (2), the lower end cover (3) is matched and attached to the shaft shoulder (2), and the lower end cover (3) is in interference fit with the cutter shaft (1).

3. A drum-shaped sliding bearing type shield cutter according to claim 2, characterized in that, The outer side of the upper end cover (7) is provided with a concave groove, one end of the cutter shaft (1) is provided with the locking nut (8) matched with the concave groove, and the upper end cover (7) is attached with the drum-shaped sliding bearing (9).

4. A drum-shaped sliding bearing type shield cutter according to claim 3, characterized in that, The O-shaped sealing ring one (12) is arranged between the shaft shoulder (2) and the lower end cover (3); and the O-shaped sealing ring two (13) is arranged between the locking nut (8) and the upper end cover (7).

5. The drum-shaped sliding bearing type shield cutter according to claim 1, characterized in that, The inside of the cutter hub (4) is symmetrically provided with the arc-shaped slot (14), and the drum-shaped sliding bearing (9) is embedded in the inside of the cutter hub (4) through the arc-shaped slot (14); and the cross-sectional width of the drum-shaped sliding bearing (9) gradually increases from left to right and from right to left.

6. A drum-shaped sliding bearing type shield cutter according to claim 5, characterized in that A plurality of through holes are arranged on the drum-shaped sliding bearing (9), and the graphite blocks are embedded in the inside of the through holes.

7. The drum-shaped sliding bearing type shield cutter according to claim 1, wherein The right side of the cutter ring (5) is provided with the retaining ring (6), the retaining ring (6) is clamped on the cutter hub (4) to limit the axial movement of the cutter ring (5).

8. The drum-shaped sliding bearing type shield cutter according to claim 1, characterized in that, The oil plugs (11) are arranged on the lower end cover (3) and the upper end cover (7), the number of the oil plugs (11) on the lower end cover (3) is one, and the number of the oil plugs (11) on the upper end cover (7) is two.

Images