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Ultra-high pressure hydraulic nuts for mining/bearing assembly and disassembly
Key words:
Hydraulic coupling, hydraulic bolt, hydraulic nut, thruster
Classification:
Product Description
Features of 1. hydraulic nuts
Suitable for all kinds of vibration, fast rotation, large power equipment and narrow space economy, light weight, high precision
It can be equipped with manual pump, pneumatic hydraulic pump and electric hydraulic pump. Multiple hydraulic nuts can use standard working pressure 150Mpa at the same time (non-standard hydraulic nut M300 pressure can reach 250MPA can be customized according to customers). Application scope: bolt fastening of large equipment such as mines, electric power, oil fields, ships, steel, metallurgy, petrochemical, etc!
Principle of 2. hydraulic nut
Ordinary thread locking is locked by turning a wrench to generate torque. The main force is consumed to overcome the frictional resistance between threads. Especially for large-diameter thread connections, affected by manpower, tools and working space, the pre-tightening force simply cannot reach Design and installation requirements, so the thread is easy to loosen in vibration occasions.
The hydraulic nut completely changes the traditional thread fastening method and changes the traditional torque locking to axial tension locking. That is, the hydraulic nut is used to elongate the fastening bolt axially with the help of the power of the oil pressure pump, close to the yield point of the material, and the thread is locked by using the elasticity of the material itself.
3. hydraulic nut working system
Hydraulic nut working system is mainly composed of three parts:
① Pressure oil pump (manual, electric or pneumatic) (optional)
② Pressure hose assembly (including quick-change connector) (optional)
③ Hydraulic nut (or hydraulic bolt tensioner)
Wide application of 4. hydraulic nuts
The structural particularity and fastening property of hydraulic nuts have been widely used in various fields of strong anti-loosening fastening, strong jacking and strong connection locking, especially suitable for strong pressing, strong fastening and strong jacking in frequent disassembly and assembly occasions. They have been widely used in equipment manufacturing, equipment installation, equipment matching and equipment maintenance, and have achieved excellent results incomparable with other methods.
Application of hydraulic nut in shearer machinery
The application of hydraulic nuts in shearers has been more than ten years of history, mainly used for the detachable connection of large boxes of shearers. As a large-scale equipment for underground operation, shearer should not only meet the needs of transportation and downhole, but also meet the connection reliability between various components and the disassembly and assembly needs for frequent maintenance. Hydraulic nut can easily realize the reliable connection of electric control box, electric box, electric box and intermediate box of large-scale shearer and ensure that shearer is not loose in normal operation to ensure the safety of use.
Application of hydraulic bolt tensioner in oil pipeline
Long-distance oil pipelines are connected by welding or large flanges with different specifications. The flange connection must require the connecting bolts to have certain strength requirements and fastening and sealing requirements. At present, the traditional human wrench or hydraulic wrench has insurmountable disadvantages: heavy and inconvenient to use, only one bolt can be fastened at a time, low fastening efficiency and long time, multiple sets of bolt pretightening force can not guarantee unity, and the cost of hydraulic wrench is high. If the hydraulic bolt tensioner is used, it has the following advantages: light weight, simple and convenient use, multiple sets of bolts can be fastened at the same time to achieve the same pre-tightening force (deviation ≤ 3%) as required, high efficiency, only 1-2 minutes for fastening a set of bolts, low use cost, and especially suitable for field projects or field projects without power supply.
③ Other wide application of hydraulic nut
After several years of rapid development and promotion of hydraulic nuts, its application areas have been fully understood and applied in various industries:
Power generation industry turbine wheel and large cooling pump and large fan fastening connection;
Application Specifications: M36,M42,M46,M48,M52,M64,M76,M80
▲ Chemical machinery and chemical equipment chemical container large pipeline, flange fastening connection and sealing connection;
Application Specifications: M64,M72,M80,M120,M135,M220
The fixed installation of large-scale equipment on the ship platform and the application of equipment connection;
Application Specifications: M80,M100,M160,M240,M260
▲ Locomotive engine shell connection using a large number of hydraulic nuts and hydraulic bolt tensioner;
Application Specifications: M36,M42,M64,M80
▲ The rolling ring of the new composite roll rolling mill adopts a special hydraulic nut for strong tightening;
Application Specifications: M200,M220,M240,M260,M275,M280
▲ The interference cold assembly of large bearings (or axles) uses special hydraulic nuts for cold assembly work;
Application Specifications: M120,M140,M200,Tr220,Tr240,Tr260,Tr320,Tr360
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