Introduction of hydraulic nut
Hydraulic nut is a detachable tool, which is usually used on relatively large machines to lock the interface. The shape is generally round or conical, which is very suitable for the use of specific workpieces. It can be installed and easily removed. The basic working principle of hydraulic nut is to send hydraulic oil into the nut through certain means, and then generate strong pressure to generate the force to push the piston, thus making the installation and disassembly of the workpiece more convenient. Using hydraulic nuts is a safer and less wasteful method. In this sense, hydraulic nuts also promote the development of industrial production.
Characteristics of hydraulic nut
1, the tension mode is not affected by the bolt lubrication effect and thread friction, and more accurate bolt load can be obtained;
2, a plurality of bolts can be stretched synchronously, so that the whole circle of bolts is uniformly stressed and a balanced load is obtained;
3. As the most advanced ultra-high pressure hydraulic technology is adopted, the bolt can be locked in a small space;
4. The residual load and effective load obtained by fastening bolts by tension method are larger than those by torque method;
5. The stretching method is more suitable for the bonding application with high fastening precision, which can make the connecting surface uniformly stressed to realize bonding and truly prevent leakage.
Advantages of hydraulic nut
1, suitable for all kinds of vibration, fast rotation, high-power equipment and narrow space;
2, economy, high efficiency, light weight and high precision;
3, can be equipped with manual hydraulic pump, pneumatic hydraulic pump and electric hydraulic pump;
4. Multiple hydraulic nuts can be used at the same time; ;
5. The axial thrust distance required by the bearing can be measured directly, accurately and stably through the measuring ring in the structural design without using a gauge;
6. Hydraulic nuts with the same specifications can be used when installing and disassembling the dismounting sleeve, which are not available in patent hydraulic nuts such as attached tables or hanging connecting blocks;
7. Using the additional screw of the measuring ring to disassemble the nut and replace the damaged O-ring, which saves time and parts cost compared with the general design;
8. The sealed bearing can be installed without measuring the internal clearance of the bearing to determine the axial thrust of the bearing.
Working principle of hydraulic nut
Hydraulic nut is an advanced bolt fastening system with the same working principle as bolt tensioner, which is mainly used for the assembly of fasteners in narrow spaces and the fastening of heavy-duty vibrating machinery. It reformed the traditional fastening method, and used the hydraulic system to make the fastened bolt accurately reach the predetermined load through pure axial stretching, and then mechanically locked on the fastener, thus completing the fastening work. Because the screw is only subjected to pure tension, the pre-tightening force of the bolt pair can be increased by 20%-30%.
Application of hydraulic nut
1, hydraulic nuts are widely used in metallurgical copper-aluminum metal industry, paper industry, hydraulic locking on cutting machines and so on.
2. Install and remove the propeller and rudder tile, etc.
3. Remove the high-voltage grounding meters, such as train wheels, couplings, flywheels and gears.
Hydraulic nut is an advanced bolt assembly method, especially suitable for mechanical fastening with narrow space and large load vibration. The working principle of hydraulic nut is that the hydraulic cylinder directly exerts external force on the bolt, which makes the applied bolt elongate in its elastic deformation zone. After the bolt is extended, the locking ring on the hydraulic nut is tightened, so that the bolt will be locked in the extended position by the locking ring.
The hydraulic cylinder is located at the central axis of the bolt and is used to axially stretch the bolt to achieve the required stretching amount of the bolt. It is the tension of the bolt that determines the clamping force required for bolt fastening. When the hydraulic nut is pressed, the bolt is stretched and the hydraulic nut is close to the joint surface. So as to lock the axial deformation of the bolt, that is, the residual bolt load in the locking nut. Many connection surfaces are equipped with washers. The gasket only works when the connecting surface is compressed, so it is particularly important that the connecting surface is always clamped. The load applied to the bolt is directly proportional to the oil pressure in the hydraulic cylinder, and this design can retain the payload very accurately. Because the load is directly applied to the bolt, and all the acting forces are used to lengthen the bolt, the space required for generating the load can be minimized.
Hydraulic nut action
Hydraulic nuts can be used alone or in combination, and can also be equipped with manual or pneumatic or electric hydraulic pumps. When in use, the distance can be well measured without a scale. Hydraulic nuts are widely used in some papermaking industries and some metallurgical industries. Some propellers and rudder shoes can be installed or unloaded, and the contact surface between train wheel and flywheel can also be removed.
Hydraulic nut installation
1. Prepare the hydraulic nut, screw in the workpiece, then lock the nut, and pay attention to that the pressure ring of the hydraulic nut is fixed in place.
2. Insert the oil injection interface of the manual pump into the oil injection port of the hydraulic nut, lock the handle of the unloading switch on the right side of the manual pump, and then slowly pressurize it to deflate the deflation cover on the oil drain joint until the air in the nut is exhausted.
3. When the air in the nut is released, unscrew the discard cap outward, close the one-way valve, and then pressurize the oil to make the pressure ring of the hydraulic nut press outward. When the pressure reaches the required pressure, loosen the handle of the unloading switch and the pressure connector of the manual pump to complete the installation.
Usage of hydraulic nut
One. Before using the hydraulic nut, prepare the hydraulic oil, and then connect the hydraulic nut with the large workpiece through the connecting wire, so that the hydraulic oil can be transported normally;
Two. When transporting hydraulic oil, we lock it in a key position by hand, and then observe the transportation of hydraulic oil. When the hydraulic oil is delivered to the standard line, we can manually turn off the delivery switch, and then proceed to the next operation;
Three. After the hydraulic oil is delivered, we need to run a component to check the normal use of the equipment and the compression of the hydraulic nut, and then we can install and disassemble it normally.
Matters needing attention in using hydraulic nut
One. When we use hydraulic nuts, we should pay attention to the delivery of hydraulic oil, which is related to the actual use of our hydraulic nuts, so we should pay close attention to its situation;
Two. When using hydraulic nuts, attention should be paid to the docking of interfaces when combining with large workpieces, which is related to the safety of hydraulic nuts. If there is no docking, there will be many problems, such as the waste of hydraulic oil and time, and the most important thing is safety.
Three. Hydraulic nuts should be cleaned in time after use.
Editor's summary: The above is the introduction of the working principle of hydraulic nut, the use method and matters needing attention of hydraulic nut. Due to the research of hydraulic technology, the hydraulic nut can lock the bolt in a narrow space to minimize the load space. We can also use hydraulic nuts to stretch multiple bolts together, so that the force is uniform, thus completing the load balance.