Horizontal boring machine boring shaft seal structure

2020 - horizontal boring machine boring shaft seal structure form 04 - 10 shu-sheng Yang Li Kun Wang Jingxing ( Shen machine group kunming machine tool co. , LTD. ) Abstract: the paper introduces the boring boring shaft seal structure and its principle, analyzes the horizontal milling and boring machine boring axis sealing structure, and the advantages and disadvantages of each structure is presented. Key words: boring axis; Seal; Structure 0 is the purpose of the introduction boring shaft seal to prevent iron filings, cooling fluid, dirt and other contaminants into the boring axis components inside, at the same time prevent boring axis bearing lubricating oil or grease leak. Horizontal boring machine boring axis horizontally to decorate, this structure makes dirt to enter, and horizontal boring machine boring shaft seal design more stringent requirements are put forward. In view of this, this paper introduces the horizontal milling and boring machine boring axis 4 kind of sealing structure, and analyzes the features and advantages and disadvantages of each structure. 1, horizontal boring machine boring shaft seal structure of the common forms of horizontal boring machine boring shaft seal structure can be summarized as the following four: gap seal, seal and seal oil slinger curved road and gas seal. The four belong to non-contact rotary sealing to seal structure. Non-contact seal is produced by in the sealed fluid pressure drop to seal. This seal structure is simple, durable and reliable operation. But boring machine boring axis belong to precision mechanism, single seal form function have some limitations. Therefore, this article introduces the practice how to combine several sealing form combination. Gap sealing structure is boring axis and retain only narrow the gap between bearing gland hole, in the end of the boring axis and the bearing gland has a few very narrow gap, radius clearance usually is 0. 1毫米~ 0。 3mm。 Using the minimum clearance throttle effect so as to achieve sealing effect, this seal structure is simple, but the sealing effect is relatively poor. Qu road seal is made between rotating and stationary seal parts of twists and turns of the synthetic aperture combination. The use of fluid in a narrow and winding road piece of throttling effect of sealing effect. According to sealing qu road bump in the direction of the judge, divides into the sealing curve road radial and axial curve road. Through theoretical analysis, the longer the length of road, the gap is smaller, the better the sealing effect. But the gap is smaller, the longer the related parts processing cycle, the higher the cost, and with the component temperature, due to the long hot cold there parts of rotating and stationary parts, bilge death phenomenon. On road clearance when the design of specific values, the designer can be combined with boring machine to determine the actual usage, also can through the query to determine the relative bearing sample. Oil slinger seal is at the end of boring axis machining of up to six zigzag ring groove, using boring axis generated when the high-speed rotation of the centrifugal force will flow out again by the bearing end cover of the oil collecting chamber and the bearing oil cavity interlinked orifice flow back to seal. Usually toothed ring groove can be used of equilateral, inequilateral may be adopted. When l sawtooth ring groove is used, should pay attention to the direction of the sawtooth in contrast to the direction of flow. Gas seal is the use of compressed air in boring axis and the gaps between the mating part to produce a outward gas curtain, to prevent fluid into the boring axis parts internal implementation seals. Boring axis boring axis front end using gas seal, the back-end also should use similar structure of gas seal, boring axis to ensure internal pressure balance, avoid even the appearance of large flow rate of air convection. Compressed air should be internal boring axis can enter after purification and drying. 2, boring shaft seal after the combination form of figure 1 is used to in turn with the unequal symmetric jilt oil seal and seal curved road. The advantage of this kind of sealing structure is parts of simple structure, easy processing and assembly. Defect is boring and have a certain gap between shaft and bearing cover, due to the manufacturing and assembly error, very easy to cause cooling fluid sealing, impurities such as iron into the road. And such qu road sealed only play the role of a block inside, when boring axis rotate rapidly generate centrifugal force, very easy to cast his impurities into boring axis bearing, lost the sealing effect. Therefore, this kind of structure to use less and less. Figure 2 to an adopted after former scalene symmetrical seal oil seal and hyperbolic road. This structure is shown in figure 1 and compare the biggest advantage is that after the impurities into the curved road with forms of curved road, seal, to stop because of the boring axis high-speed centrifugal force produced by the rotation of the impurities, curved road seal also can prevent the bearing lubricating oil leakage. Second, the sealing structure has the characteristics of simple in structure, convenient in installation. Therefore the use of this structure is more and more. Shown in figure 3 the sealing structure adopts sealing ring, sealing gap sealing and curved road. On the basis of gap seal and curved road seal increased oil baffle and gland, implements prevent dirt from entering boring axis components inside, at the same time realize the prevent the effect of the boring axis bearing lubricating oil or grease leak. But this kind of complex structure, higher requirements of parts processing and assembly. Therefore, this structure is mainly used in precision machining center. Figure 4 seal structure adopted qu road seal and seal gap and oil sealing structure. This structure can prevent impurities from entering the internal boring axis, but this kind of structure is complex and parts processing and assembly have higher requirements. Therefore, this kind of structure is not recommended. 3, epilogue boring boring shaft seal method has a lot of kinds, how to select appropriate sealing structure form, the need to the designer according to the use environment of boring machine, boring machine processing factors such as beats to determined comprehensively. In conclusion, through the contrast analysis we can see, the left oil seal and hyperbolic seal and gap sealing and road structure has more advantages. Therefore, this kind of structure has been widely used in the horizontal boring machine boring shaft seal structure. Source: the mechanical and electrical equipment. 4, 2015