The Hydraulic Nut as drilling machine for tunnel construction is a permanent fixture, replacing the conventional nut and retaining the high bolt load and extension in small space envelopes where there may not be sufficient space to use tensioners. The nut can be retrofitted to existing plant and is a simple and accurate solution to mechanical jointing problems.
The locking for hydraulic nuts is different from common nuts. When the hydraulic nut is locking, it causes ultra-high pre-tightening force by hydraulic pressure (about 200 MPa), which can get close to the yield point of the bolts. It will not loosen even if it is in vibrating condition.
Hydraulic nut is especially suitable in the fastening for the coal miners and roadheaders in underground mining where the space is very narrow. It can also be used in the machines for metallurgy , chemical industry and engineering machinery.
Hydraulic nut is a kind of locking device which relies on pre-tightening force that can make the connecting nuts longer. So the high-strength two head nuts above 10.9 grade must be used.
|No.||Code name||M Model||Overall dimensionsΦB×A||Route|
|11||KMYC||M42×3(Major external diameter)||Φ94×66||14|
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