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In modern times, various types of machines use more balancing methods. For example, single-sided balancing (also known as static balancing) often uses a balancing frame, and double-sided balancing (also known as dynamic balancing) uses various types of dynamic balancing testing machines. The static balance accuracy is too low and the balance time is long; although the dynamic balance test machine can balance the rotor itself well, for the large difference in rotor size, a dynamic balance machine of different specifications is often required, and the test still needs to be The rotor is removed from the machine, which is obviously neither economical nor very labor intensive (eg steam turbine rotor after overhaul). In particular, the dynamic balancing machine cannot eliminate system vibration caused by assembly or other following components. Balancing the rotor under normal installation and operating conditions is often referred to as "field balancing." On-site balancing can not only reduce the labor of disassembling and disassembling the rotor, but also eliminate the need for a dynamic balancing machine; at the same time, because the test state is the same as the actual working state, it is helpful to improve the accuracy of measuring unbalance and reduce system vibration. The international standard ISO 940-1973 (E) "Balance accuracy of rigid body rotating bodies" stipulates that precision rotors with a balance accuracy of G0.4 must be balanced on-site, otherwise the balance is meaningless.
Modern dynamic balancing technology was developed with the emergence of steam turbines at the beginning of this century. With the rapid development of industrial production, rotating machinery is gradually developing toward precision, large-scale, and high-speed, which makes the problem of mechanical vibration more and more prominent. The severe vibration of the machine will bring a series of hazards to the machine itself and its surrounding environment. Although there are many reasons for vibration, it is generally believed that "unbalanced force" is the main reason. According to statistics, about 50% of mechanical vibrations are caused by unbalanced forces. Therefore, it is necessary to change the mass of the moving part of the rotating machine to reduce the unbalanced force, that is, to balance the rotor.
There are many factors that cause the rotor unbalance, such as: the unevenness of the rotor material, the unbalance of the coupling, the asymmetric keyway, the rotor machining error, the corrosion, wear and thermal deformation of the rotor during the movement. The amount of unbalance caused by these factors is generally random and cannot be calculated. It needs to be measured and corrected by gravity test (static balance) and rotation test (dynamic balance) to reduce it to the allowable range. The most widely used balancing method is the process balancing method and the on-site dynamic balancing method. As an important branch of on-site dynamic balancing technology, online dynamic balancing technology is also booming and promising. Because the process balance method is the earliest classic dynamic balance method.
The on-site dynamic balancing technology of the whole machine is proposed to solve the problems existing in the process balancing technology.
The test system of the process balance method suffers little interference, high balance accuracy, and high efficiency. It is especially suitable for the single balancing of rotating mechanical parts in the production process. It currently plays a very important role in the field of dynamic balance. Steam turbines, aviation This balancing method is commonly used in engines. However, the process balance method still has the following problems:
(1) The rotational speed at the time of balancing is inconsistent with the working rotational speed, resulting in a decrease in balancing accuracy. For example, many rotors are disturbing rotors with second-order critical speed. Due to the limited speed of the balancing machine itself, if these rotors are balanced by process, they cannot effectively prevent the unbalance caused by the deformation of the rotor at high speed.
(2) Balancing machines (especially high-speed vertical balancing machines) are expensive.
(3) The rotor that is well balanced on the dynamic balancing machine is difficult to guarantee its balance accuracy after installation. Because the supporting conditions during dynamic balancing are different from the supporting conditions of the rotor under actual working conditions, and the cooperation between the rotor and the balancing device is also different from the matching conditions between the rotor and its own rotating shaft, even if it has been reached on the dynamic balancing machine before leaving the factory. High-precision balanced rotors, after transportation, reassembly and other processes, the balance accuracy will inevitably decrease before use. When running at the working speed, it may still produce impermissible vibration.
(4) Due to the size and weight limitations of some rotors, it is difficult or even impossible to balance on the balancing machine. For example: For large rotors such as large generators and turbines, due to the lack of corresponding large balancing devices, they often cannot be balanced; for large high-temperature steam turbine rotors, elastic thermal warpage is generally prone to occur and will automatically disappear after shutdown. The rotor needs to be thermally dynamically balanced, and it is obviously impossible to balance with a balancing machine.
(5) The rotor must be disassembled for dynamic balancing, with long downtime, slow balancing speed, and large economic loss.
In order to overcome the shortcomings of the above-mentioned process balancing method, people have proposed the on-site dynamic balancing method.
The balancing operation performed by the assembled rotating machinery in the field installation state is called overall field balancing. In this method, the machine is used as a dynamic balancing machine base, and the vibration information of the relevant parts of the rotor measured by the sensor is used to perform data processing to determine the imbalance and its orientation on each balance correction surface of the rotor, and eliminate it by deduplication or weighting. Unbalance amount, so as to achieve the purpose of high precision balance.
Because the on-site dynamic balancing of the whole machine is directly connected to the whole machine, no dynamic balancing machine is needed, only a low-cost test system is needed, so it is more economical. In addition, because the rotor is balanced under actual working conditions, no reassembly and other processes are required, and the whole machine can obtain a high balance accuracy under working conditions.
The meaning of online dynamic balancing of grinding wheels is that grinding machines are an indispensable working machine for precision machining. In order to meet the requirements of increasingly precise working precision and the continuously pursued goals of high efficiency and low cost, the global grinding machine manufacturing industry is unremittingly committed to: Improve the geometric accuracy, rigidity and performance stability of the machine tool.
As we all know, the grinding wheel is a necessary tool for grinding machines. If you want the grinding wheel to grind out the accurate size and smooth surface, you must prevent the vibration during the grinding process. The structure of the grinding wheel is composed of a large number of unevenly distributed particles. Inherent imbalance cannot be avoided, which will inevitably cause certain eccentric vibration. The eccentricity of the grinding wheel installation, the uneven thickness of the grinding wheel, the unbalance of the main shaft, and the adsorption of the coolant by the grinding wheel will increase the vibration. These vibrations not only affect the processing quality of the grinding machine, but also reduce the life of the spindle of the grinding machine, the life of the grinding wheel, increase the number of grinding wheel corrections, and the consumption of dressing diamonds.
Commonly used machinery contains a large number of components that perform rotary motion, such as various transmission shafts, main shafts, electric motors, and rotors of steam turbines, which are collectively referred to as slewing bodies. In an ideal situation, the pressure on the bearing is the same when the rotating body is rotating and when it is not rotating. Such a rotating body is a balanced rotating body. However, due to uneven materials or rough defects, errors in processing and assembly, and even asymmetric geometric shapes during design, various revolving bodies in the project make the revolving body rotate The centrifugal inertial force generated by the tiny particles cannot cancel each other. The centrifugal inertial force acts on the machine and its foundation through the bearing, causing vibration, generating noise, accelerating bearing wear, and shortening the life of the machine. In severe cases, it can cause destructive accidents. To this end, the rotor must be balanced to achieve the allowed balance accuracy level, or the resulting mechanical vibration amplitude should be reduced within the allowable range.