Components: Hydraulic fitting bolt is a new type bolt used for flange connecting. It consists of tapered bolt, sleeve, and two fitting nuts.
Working Principle:
Make use of the same taper between the sleeve inner surface and the bolt outer surface, Inject high pressure oil between its taper, Use hydraulic stretchers to stretch the bolt. So that the bushing expansion until the bushing outer circle and the gap between the flanges hole to eliminate, to achieve the outer diameter of the bush with the purpose of the flange hole fit.
Disadvantages of traditional fitting bolts:
The traditional flange holes are used interference fit. Most of the installation using the freezing method of installation, Due to erosion, interference, metal friction and other reasons for the demolition of screw holes and bolts scratching, so when repairing each batch of these reamer bolts, it is necessary to replace a number of bolts. Bolt holes need to be reamed, and some high price components will be damaged. At the same time manufacturing bolt and reaming bolt hole need a long time, will increase the maintenance workload, increase costs, reduce ship running time, and increase equipment maintenance costs.
Main advantage£º
| 1) |
It is easy to install and remove it by hydraulic tension instead of traditional knocking or cold contraction. After removing it, its tapped bolt stem, inner and outer round of middle sleeve and inner hole in shaft coupling keep their original surface roughness. So they can be used time after time. |
| 2) |
Requirements of bolt hole dimension tolerance and surface machined roughness is not high. Bolts need not preciously fit with the hole, make bolt hole machining convenient. |
| 3) |
Because the gap between sleeve outer diameter and bolt hole, it is easy to put it in the holes by hand, on the contrary, also easy to remove it from the holes, avoid gripping. |
| 4) |
It simplifies the alignment of shaft and can control the sleeve expansion, so the concentricity between flanges recovers quickly. |
| 5) |
Hydraulic bolts can bear the torque, and also depends on the pressure between the two flanges, hydraulic bolts can transfer torque. This connection is liable and assures equipments running normally. |
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