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Analysis of Seal Leakage of Roller
Release date: 2017-01-11    Views: 116    News editor: 
Heavy wheel is an important load-bearing parts of track-type construction machinery (commonly known as "the next roller"), which consists of the weight wheel, shaft, left and right bearing seat and seal components and other components. The supporting shaft is fixed on the carriage frame through the left and right bearing seats, the sleeve of the wheel body is press-fitted to rotate with the supporting shaft, and a sealing component is arranged between the rotating wheel body and the fixed left and right bearing blocks to keep the supporting shaft And bushings and other parts of the oil seal. The seal assembly consists of a pair of double tapered metal seal ring and two small rubber eyes fixed ring composed of compressed. The rubber ring is installed in the sealing seat of the wheel body and the bearing seat respectively. The sealing ring is floating seal type, because the metal sealing ring is pressed by the rubber ring to ensure the annular cutting belt is tightly engaged in the rotation.
Analysis of Seal Leakage of Roller
Roller is an important load-bearing parts of track-type construction machinery (commonly known as "the next roller"), which consists of the weight wheel, support shaft, left and right bearing seat and sealing components and other components. The supporting shaft is fixed on the carriage frame through the left and right bearing seats, the sleeve of the wheel body is press-fitted to rotate with the supporting shaft, and a sealing component is arranged between the rotating wheel body and the fixed left and right bearing blocks to keep the supporting shaft And bushings and other parts of the oil seal. The seal assembly consists of a pair of double tapered metal seal ring and two small rubber eyes fixed ring composed of compressed. The rubber ring is installed in the sealing seat of the wheel body and the bearing seat respectively. The sealing ring is floating seal type, because the metal sealing ring is pressed by the rubber ring to ensure the annular cutting belt is tightly engaged in the rotation.
In 1995, I plant for a company supporting the production of excavators supporting wheel, the company provides foreign production drawings, floating seal components imported from abroad. After several tests, analysis and testing, it was found that the floating angle of the company's floating seal assembly and its seat was significantly smaller than that of our factory. Of the other types of oil seal angle; by mapping calculation, the rubber ring compression is too large.
We believe that the floating oil seal of the cone angle is small, for reducing the external impact of the floating ring seal ring meshing ring beating, sealing surface to improve the axial force and maintain its axial force is not due to the axis of the system It is advantageous to make a sudden change to a large gap. But the sealing cone angle becomes smaller, in the wheel assembly can easily lead to rubber ring in the cone on the skew, coupled with the seal seat on the rubber ring compression increased, more difficult to ensure the sealing engagement with the blade in the correct position. Analysis of some of the international advanced information on the company know, floating oil seal cone angle smaller, is the development trend of the design.
According to the above analysis, we have taken two measures:
(L) the original design of the floating oil seal ring taper and rubber ring seat cone angle and other parameters remain unchanged, with the most simple design changes to properly change the sealing rubber ring compression.
(2) to improve the assembly process, adding special tools to ensure that the floating oil seal rubber ring in the sealing ring cone on the correct location and the seat of the seat into the correct position to ensure the two ring seal ring meshing.
According to the above measures, after rigorous assembly, whether the test or installed, no leakage was found.
We believe that, in order to improve the travel mechanism of construction machinery floating wheel supporting the life of the seal components, foreign companies will be the sealing ring cone angle and the rubber ring seat cone angle oblique angle smaller, theoretically and practically Look are beneficial, but the manufacturing can not guarantee if the assembly is in place, will backfire.
If the assembly of the floating seal assembly is wrong, in the static original position, although the factory to do air tight check, but because of the elasticity of the rubber ring, air tightness check the pressure is less than a considerable value is not check out, Does not occur Leakage work After a certain time, due to friction heating parts, cavity pressure rises to a certain value, the rotation of the meshing due to the elastic rubber band at this point in the axial cutting force to minimize the force, there will be intermittent Of the instantaneous leakage; if this case to stop the rotation, then the leak is not a moment in the meshing but a serious oil spill, and continued to the cavity pressure dropped to a certain value, the elastic rubber ring to reach a new balance, the leak before stop.
In the assembly error state, the operation will occur in the local blade surface due to the pressure Ambassador wear and tear increased, while the rapid heat, resulting in reduced viscosity of the lubricant, the rotation of the wear and tear increased.
The above analysis shows that a high-quality components, in addition to the advanced design, high-quality parts processing, the correct perfect assembly is very important.
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