Shield machine Lord bearing seal sealing performance research

Shield machine Lord 2018 - bearing seal sealing performance research 10 - 23 Chen zhou jj Li Fengyuan help wang feng qi-wei Chen ( Shield and tunneling technology state key laboratory) Large buried depth of shield tunnel machine Lord bearing seal performance put forward higher requirements. Different material were studied with finite element analysis software ANSYS Workbench hold-down ring seals under different load stress condition, study its sealing performance. The analysis results show that the compression ring lip seal sealing ability and pre-tightening load and material have a relationship, when the pre-tightening load, the greater the seal when the higher hardness value, the greater the sealing surface contact pressure, the stronger the sealing ability. Therefore, in order to improve the large buried depth of shield machine Lord bearing seal ring sealing performance, can take the following measures: in the aspect of material should choose high hardness value compression ring sealing ring, can increase the number of pressure seal when necessary; In the aspect of structure should be appropriately increased the diameter of pressure ring, ensure hold-down ring have enough preloaded exerting greater displacement load, improve the sealing surface contact pressure. Across the river in the sea tunnel with large buried depth, high pressure, the characteristics of long and complicated geological conditions, the shield machine Lord bearing seal reliability and life expectancy higher requirements are put forward. If the main bearing seal failure, will directly cause of shield machine downtime, and inside the hole of shield machine Lord bearing repair is very difficult, if that were to happen, will increase the risk of shield construction, the construction period will be extended, cause the cost increase, for construction enterprise to bring the huge losses. At present about the shield machine Lord bearing seal sealing performance of the study is not much. SangJianBing, psoriasis and other people study the axis force of the lip seals under different load and seal performance; Yu Run raw studied the influence factors of Yx seal ring seal, put forward the structural optimization scheme, in order to investigate the influence of heating on the sealing performance; Lu selection is described in detail, such as the axis of rotation of lip seal sealing mechanism, influencing factors, the key points of design and material selection principle; Zhang dong ge Yx seal ring is analyzed by using ANSYS, such as the deformation and stress distribution under different working pressure, find out the Yx ring between sealing performance and structural parameter change rule. The literature from different angles, different levels of the axis of rotation lip seal of this type are studied, but in view of the shield machine with compression ring lip seal's stress state and material properties, the relationship between the sealing performance research. In this paper, the author used in common outside the shield machine Lord bearing seal compression ring lip seal as the research object, analysis of shield machine Lord bearing seal structure is outside the lip seal sealing performance, research under different load, the lip seal contact pressure and the relationship between the material and seal material and pre-tightening load were analyzed and the relationship between the hydrostatic pressure resistance. 1, outside the shield machine Lord bearing seal structure on the current international famous shield construction machine manufacturer of main bearing sealing adopts frame type lip seal, common lip seals are single lip seal, with a compression ring lip seals and lip seal, as shown in figure 1. In this paper, the author will study the pressure seal installation diagram as shown in figure 2, it is a common outside of the shield machine Lord bearing seal structure and seal chamber were two hold-down ring seal and double lip seal separated into five relatively independent seal chamber, each separated seal by the sealing spacer, make it keep good state of installation position and seal. When installation, by sealing spacer and outside pressure hardening of the rubber sealing ring ring, make the seal lip produces a certain pressure, improve the sealing effect. Sealing ring material is different, the size of the preloading is different also, through the analysis of the relationship of the preloading and material, combined with the lip seal principle, research is suitable for large buried depth of shield machine Lord bearing outer gland seal material and seal performance. 2, the working principle of the lip seal lip seal face for lip, under the action of pressure, lip and sealing surface fit closely, compared with JiYaXing seals have stronger self-tightening effect, the use of compression ring is to further strengthen the self-tightening effect. As shown in figure 3, when hold-down ring lip seal, the sealing lip and sealing bushing of the contact pressure between the pw comes from two aspects: one is from the medium pressure, medium pressure PI directly effect on the lip, make the seal lips and seal liner produce certain contact pressure; On the other hand from the compression ring. Hold-down ring outside the medium pressure, under the action of sealing ring and sealing spacer, constantly into wedge-shaped lip seal mouth, have a certain amount of pressure on the sealing lip. When the maximum of contact pressure pw is greater than medium pressure PI, sealing lip blocking medium leakage passage, play the role of sealing. Conclusion (3, 1) Compression ring lip seal sealing ability and pre-tightening load and material have relations. When pre-tightening load, the greater the seal hardness value is higher, the greater the sealing surface contact pressure, the stronger the sealing ability, can resist greater external pressure. （ 2) For large buried depth of shield machine Lord bearing outer seal design, in terms of material, high hardness value should be selected for the hold-down ring seal, when necessary, can increase the number of compression ring sealing ring; In terms of structure, in order to improve the sealing performance of hold-down ring sealing ring, should be appropriate to improve the structure of sealing ring size, increase the diameter of pressure ring, ensure hold-down ring have enough preloaded exerting greater displacement load, improve the sealing surface contact pressure.