Shield tunneling machine cutter with high impact resistance

Abstract

The utility model discloses a shield tunneling machine cutter with high impact resistance, which comprises a cutter shaft, an end cover and a cutter hub, the end cover is positioned on the outer surface of the cutter shaft, the cutter hub is connected on the outer surface of the end cover, a floating seal is arranged between the end cover and the cutter hub, and a mud blocking ring sealed on the floating seal is arranged at the connecting end of the cutter hub and the end cover. According to the high-impact-resistance shield tunneling machine cutter, the high-wear-resistance polyether polyurethane is selected as the mud blocking ring, the cutter hub is grooved, the mud blocking ring is installed, the mud blocking ring is filled with grease, outside silt is blocked from entering the floating sealing position, the damage probability of sealing is low, and the service life of the cutter can be effectively prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of shield machine cutters, in particular to a shield machine cutter with high impact resistance. Background Art

[0002] With the rapid development of my country's economy and society, the pace of infrastructure construction has accelerated, and the development and utilization of underground space resources have received increasing attention. As a key piece of equipment in tunneling projects, shield machines have been widely used in subways, underground pipelines, and cross-river tunnels due to their high efficiency and safety. However, during hard rock excavation, the wear of shield machine cutters has always been a key factor restricting their performance improvement.

[0003] During the tunnel excavation process, shield machine cutters need to withstand extremely high pressure and wear, especially when constructing in hard rock formations. The wear rate of the cutters is accelerated, resulting in shortened tool life and frequent maintenance and replacement. This not only affects the progress of the project, but also increases the project cost. At present, the shield machine cutters on the market have certain limitations in sealing performance, which can easily lead to poor internal lubrication of the cutters, thereby exacerbating cutter wear. Utility Model Content

[0004] The purpose of the utility model is to provide a shield machine cutter with high impact resistance, so as to solve the problem in the above background technology that the sealing performance has certain limitations and may easily lead to poor lubrication inside the cutter.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-impact-resistant shield machine cutter, comprising a cutter shaft, an end cover and a cutter hub, the end cover being located on the outer surface of the cutter shaft, the cutter hub being connected to the outer surface of the end cover, a floating seal being provided between the end cover and the cutter hub, and a mud retaining ring sealed to the floating seal being provided at the connecting end of the cutter hub and the end cover.

[0006] The mud guard ring plays a certain role in preventing the mud and sand from entering the outside, and lubricating oil is poured into the mud guard ring to expand the volume of the mud guard ring, so the mud guard room is not easily worn away. Secondly, the mud and sand will not enter the floating seal due to the effect of the mud guard ring.

[0007] As a preferred technical solution of the present invention, a cavity is provided inside the mud guard ring, and the cavity is filled with lubricating grease.

[0008] The inside of the mud guard ring is hollow, and grease is filled into the inner cavity of the mud guard ring to enhance the anti-immersion and anti-deformation capabilities of the mud guard ring.

[0009] As a preferred technical solution of the present invention, the outer surfaces of the mud guard rings are respectively provided with convex patterns.

[0010] The convex patterns on the surface of the mud guard ring fit into the grooves provided inside the sealing groove, which not only prevents the mud guard ring from being displaced due to impact, but also adopts a labyrinth seal to further improve the sealing performance of the floating seal.

[0011] As a preferred technical solution of the present invention, a sealing groove is provided between the end cover and the cutter hub, and the sealing groove and the mud retaining ring form a sealing structure.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] Use highly wear-resistant polyether polyurethane as the mud guard ring, groove on the cutter hub, install the mud guard ring, fill the mud guard ring with grease to prevent the mud and sand outside from entering the floating seal position, reduce the chance of seal damage, and effectively extend the life of the tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall internal cross-sectional structure of the utility model.

[0015] In the figure: 1. End cover; 2. Blade shaft; 3. Blade hub; 4. Blade ring; 5. Retaining ring; 6. First O-ring; 7. Gasket; 8. Limit cover; 9. Buckle; 10. Valve core; 11. Second O-ring; 12. Floating seal; 13. Magnet; 14. Oil plug; 15. Graphite copper sleeve. DETAILED DESCRIPTION

[0016] See also Figure 1 The utility model provides a technical solution: a high-impact-resistant shield machine cutter, comprising an end cover 1, a cutter shaft 2 and a cutter hub 3. The end cover 1 is located on the outer surface of the cutter shaft 2, and the cutter hub 3 is connected to the outer surface of the end cover 1. A floating seal 4 is provided between the end cover 1 and the cutter hub 3, and a mud retaining ring 6 sealed to the floating seal 4 is provided at the connecting end of the cutter hub 3 and the end cover 1.

[0017] The mud retaining ring 6 plays a certain role in preventing the mud and sand from entering the outside, and lubricating oil is poured into the mud retaining ring 6 to expand the volume of the mud retaining ring 6, so the mud retaining room is not easily worn away. Secondly, the mud and sand will not enter the floating seal 4 due to the effect of the mud retaining ring 6.

[0018] As a preferred technical solution of the present invention, a cavity 7 is provided inside the mud guard ring 6 , and the cavity 7 is filled with lubricating grease.

[0019] The interior of the mud guard ring 6 is hollow, and grease is filled into the internal cavity 7 of the mud guard ring 6 to enhance the anti-immersion and anti-deformation capabilities of the mud guard ring 6.

[0020] As a preferred technical solution of the present invention, the outer surface of the mud guard ring 6 is respectively provided with convex patterns 8 .

[0021] The convex patterns 8 on the surface of the mud guard ring 6 fit into the grooves provided inside the sealing groove 5, which not only prevents the mud guard ring 6 from being displaced due to impact, but also further improves the sealing performance of the floating seal 4 by using a labyrinth seal.

[0022] As a preferred technical solution of the present invention, a sealing groove 5 is provided between the end cover 1 and the cutter hub 3 , and the sealing groove 5 and the mud retaining ring 6 form a sealing structure.

[0023] The floating seal 12 can adapt to the radial movement of the cutter shaft 2, maintain the sealing effect, and prevent the leakage of lubricating grease and the entry of rock and soil particles; the cutter shaft 2 runs through the inside of the end cover 1 and realizes the cutting operation through the axial movement of the middle end. The design of the cutter shaft 2 should ensure that it has good stability and wear resistance during the tunnel excavation process, and is usually made of high-hardness and high-strength materials.

[0024] Working principle: The end cover 1 is fixed to the outer surface of the cutter shaft 2, playing a protective and supporting role. At the same time, a floating seal 4 is provided between the end cover 1 and the cutter hub 3. The sealing structure can adapt to the radial movement of the cutter shaft 2, maintain a good sealing effect, and prevent the leakage of lubricating grease and the entry of rock and soil particles. The mud ring 6 is provided at the connection end between the cutter hub 3 and the end cover 1, and its internal cavity 7 is filled with lubricating grease to enhance the anti-immersion and anti-deformation capabilities of the mud ring. The function of the mud ring 6 is to prevent external mud and sand from entering the floating seal 4, thereby protecting the sealing structure from wear. The convex grooves 8 on the surface of the mud ring 6 are engaged with the grooves inside the sealing groove 5 to form a labyrinth seal, further improving the sealing performance and preventing the displacement of the mud ring due to impact. The cutter hub 3 is connected to the outer surface of the end cover 1, and the sealing groove 5 between the end cover 1 and the mud ring 6 together constitute a sealing structure to ensure good lubrication inside the tool and reduce wear.

Claims

1. A high impact resistant shield machine cutter, characterized in that: The invention comprises an end cover (1), a knife shaft (2) and a knife hub (3), wherein the end cover (1) is located on the outer surface of the knife shaft (2), the knife hub (3) is connected to the outer surface of the end cover (1), a floating seal (4) is provided between the end cover (1) and the knife hub (3), and a mud retaining ring (6) sealed to the floating seal (4) is provided at the connection end between the knife hub (3) and the end cover (1); a cavity (7) is provided inside the mud retaining ring (6), and the cavity (7) is filled with lubricating grease; convex patterns (8) are respectively provided on the outer surface of the mud retaining ring (6); a sealing groove (5) is provided between the end cover (1) and the knife hub (3), and the sealing groove (5) and the mud retaining ring (6) constitute a sealing structure.

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