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The manufacturer introduces the sensitivity and accuracy of the balancing machine
There are always various ways of expressing the sensitivity and accuracy of balancing machines. Generally speaking, the accuracy of the so-called instrumentation is usually expressed as the percentage of the indicated value or full scale for the amplitude error, while the phase error is usually expressed in degrees. But for the balance machine, if it is corrected according to the imbalance indication expressed with the above accuracy.
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27
2021-04
Introduce some daily maintenance rules for balancing machines
The balancing machine is a very important measuring tool. If there is a problem with the balancing machine or the measurement accuracy is inaccurate, it will seriously affect our daily work efficiency and reduce the satisfaction of car owners. Then let's take a look at the daily maintenance of the balance machine? The first step, we are some maintenance items that need to be done daily. For daily maintenance items, the first step is to divide it into 5S, which means to keep the equipment clean and the tools neatly arranged. The second step is to ensure that there is no oil stain in the main shaft and threads of the balancing machine. If there is oil stains inside the spindle or damage and bending, it will seriously affect the measurement accuracy of our balancer. The third step is to ensure this cone, and the vertebra is also a very important tool. It ensures the center positioning of the wheel hub. Then we also need to check whether the wheel hub is bumped or damaged. The fourth step is to check the quick lock nut. The same applies to the quick nut. If the quick lock nut has missing corners and damage, it will directly affect the measurement accuracy during use. If it is said that he can measure zero and zero, but he already has an inherent error, then this is also a very important daily inspection item. For the fifth step, we have to keep some of the bots on the screen that are touch screens, and some of them are button-based. Then we all need to keep these screens and buttons clearly visible without damage.
27
2021-04
Do you know what the balance machine is for?
Now, let us understand together what the balance machine does! The balance machine must first understand what balance is? From the meaning of the word, when there are multiple forces acting on the same object at the same time, the object stays at rest or moves at a constant speed is balance. For example, when the balance is weighing, the balance is used to obtain a certain weight of the item. The balance in the balancing machine refers to checking and, if necessary, adjusting the mass distribution of the rotor to ensure that the remaining unbalance or journal vibration and the force acting on the bearing are within the specified range at the frequency corresponding to the working speed. crafting process. To put it simply: check whether the mass distribution of the rotor is uniform, and adjust the uneven rotor. At this time, someone will want to ask, "What happens if the rotor is unbalanced?" If the rotor mass is not uniform, the force and the force cannot cancel each other out, and centrifugal force will be generated when rotating, and the rotor bearing will be affected by the centrifugal force. It will cause vibration, generate noise, accelerate the wear rate of the bearing, and affect the performance and life of the product. The balancing machine is a machine that measures the position and size of the unbalanced amount of a rotating object (rotor). The rotor is adjusted through the measured data, thereby improving the quality of the workpiece and the products it constitutes, increasing the service life of the supporting parts, and reducing noise and vibration.
24
2021-04
Introduce some prerequisites for on-site dynamic balance
The prerequisite for on-site dynamic balancing is the determination of unbalance faults, the determination of the number of balance faces and the completion of various preparations, which can ensure time-saving and labor-saving balancing work. If the equipment has been shut down, replace the reflective tape. Check whether the balance instrument function and power supply are sufficient and the cable connection status.
24
2021-04
Simple analysis of the technical characteristics of modern dynamic balance
The rotor is an important part of the mechanical system. The vibration often caused by its imbalance will cause equipment vibration, noise and mechanism damage. Especially for the high-speed rotating flexible rotor, the mechanical accidents will be more obvious. The rotor imbalance caused Faults account for more than 60% of all mechanical faults. With the current development of precision CNC machining technology, the dynamic balance problem of high-speed rotors that seriously affects the machining accuracy during the processing and production process becomes particularly important. The dynamic balancer can effectively ensure the reliability and safety of equipment operation, and can achieve Good economic and social benefits are of great practical significance. Various rotating bodies in engineering, due to uneven materials or blank defects, errors in processing and assembly, and even asymmetrical geometric shapes in the design, make the rotating bodies rotate on each of them. The centrifugal inertial forces generated by the tiny particles cannot cancel each other out. The centrifugal inertial force acts on the machine and its foundation through the bearing, causing vibration, generating noise, accelerating the wear of the bearing, shortening the life of the machine, and causing destructive accidents in severe cases. For this reason, the rotor must be balanced to make it reach the allowable balance accuracy level, or the resulting mechanical vibration amplitude is reduced within the allowable range. The difference between rotor dynamic balance and static balance.
24
2021-04
Performance characteristics of rigid rotor dynamic balance
For rotors whose working speed is much lower than the critical speed, the deformation caused by the unbalance is small. This kind of rotor can be treated as a rigid body, and the dynamic balance can be carried out at a low speed, which is called the dynamic balance of a rigid rotor. When the rigid rotor is dynamically balanced, the centrifugal inertial force system caused by the unbalanced amount of each micro-segment can be simplified to two arbitrarily selected sections.
17
2021-04
Selection and determination of rotor balance
In the related problems of dynamic balancing machine detection: common machinery contains a large number of rotating parts, such as various transmission shafts, main shafts, electric motors, and steam turbine rotors, which are collectively referred to as rotating bodies. Under ideal circumstances, the pressure on the bearing is the same when the revolving body rotates and when it is not rotating. Such a revolving body is a balanced revolving body.
17
2021-04
Manufacturers introduce the industry applications of gravity balancing machines
Gravity balancing machines are generally called static balancing machines. It relies on the gravity of the rotor itself to measure static unbalance. If the rotor placed on two horizontal guide rails has an imbalance, its gravitational moment on the axis causes the rotor to roll on the guide rail until the imbalance is at the lowest position. The balanced rotor is placed on a support supported by a hydrostatic bearing, and a mirror is embedded under the support. When there is no unbalance in the rotor, the light beam emitted by the light source is reflected by this mirror and then projected on the polar coordinate origin of the unbalance indicator. If there is an imbalance in the rotor, the rotor support tilts under the action of the gravitational moment of the imbalance. The reflector under the support also tilts and deflects the reflected light beam, so that the light spot of the light beam projected on the polar coordinate indicator leaves the origin. According to the coordinate position of the deflection of the light spot, the size and position of the imbalance can be obtained. Generally, rotor balancing includes two steps: unbalance measurement and correction. The balancing machine is mainly used for the measurement of the unbalance, and the correction of the unbalance is often done with the aid of other auxiliary equipment such as drilling machines, milling machines, and spot welding machines, or by manual methods. Some balancing machines have made the correction device a part of the balancing machine. The signal detected by the small support rigidity sensor of this kind of balancer is proportional to the vibration displacement of the support. The balance speed is lower than the natural frequency of the rotor-support system is called a hard-supported balancer. This kind of balancer has a large support rigidity, and the signal detected by the sensor is proportional to the vibration force of the support.
17
2021-04
The manufacturer introduces the transmission mode of the balancing machine
The driving mode of the balancing machine to drag the rotor includes ring and belt drag, coupling drag and self-driving. Ring belt drag is to use rubber ring belt or silk woven ring belt, the rotor is driven by the motor pulley. Therefore, ring belt drag requires the rotor surface to have a smooth cylindrical surface. The advantage of ring belt drag is that it does not affect the imbalance of the rotor. , High balance accuracy. Coupling drag is the use of universal joints to connect the main shaft of the balancing machine with the rotor. The characteristic of coupling drag is that it is suitable for rotors with irregular appearance, can transmit larger torque, and is suitable for dragging rotors with large wind resistance such as fans. The disadvantage of coupling drag is that the unbalance of the coupling itself will affect The rotor has an impact (so the coupling must be balanced before use). Interference will also be introduced to affect the accuracy of the balance. In addition, a large number of connecting plates must be made to adapt to different types of rotors. Self-driving uses the power of the rotor to rotate. Self-driving is the drag mode that has the least impact on the balance accuracy, and the balance accuracy can reach the highest, but only special rotors allowed by the structure can use this drag mode. The balancing machine is a machine that measures the size and position of the unbalance of a rotating object (rotor). When the rotor rotates around its axis, centrifugal force is generated due to the uneven mass distribution relative to the axis. This kind of unbalanced centrifugal force acting on the rotor bearing will cause vibration, generate noise and accelerate bearing wear, which will seriously affect the performance and life of the product. Therefore, a balance machine must be used for testing.
11
2021-04
Take you to appreciate the industry development of balancing machines
Balancing technology originated from the emergence of rotating bodies. With the emergence of high-speed steam turbines, engines, electric motors, centrifugal pumps, compressors, etc., it began to receive extensive attention and rapid development. With the continuous improvement of balance requirements, symmetrical design can no longer be fully achieved. For the performance requirements of the machine, in order to obtain better practical results in the professional roll cutter and roller calibration, it is necessary to perform high-precision Dynamic balance correction. The balancing machines from 20 years ago are still in use today. Compared with modern machines, only a small part of the previous balancing machines are the same. Although generally speaking, the rotor is still mounted on the bearing in recent years, the driving method has not changed much, and the electronic technology is not very mature. In industry, only pure mechanical measurement is usually used. In order to improve the sensitivity of the test and select the frequency, it is generally chosen to measure below the resonance frequency. This method is a very good and commonly used choice. Initially, the angle of the unbalance is determined based on empirical guesses, and this is also true in the plane separation of multi-plane calibration. In the following ten years, a variety of new methods and patented technologies appeared. They are mainly used to perfect and improve the balance machine, develop various temporary new systems, balance correction, and improve the economic efficiency of the product and reduce the balance time as the development purpose. This principle is introduced into the design of the machine. Before electromechanical converters were widely adopted, most companies only put their energy into improving designs. After World War II, with the rapid development of electric F technology, it led to a revolutionary leap in balancing machines.
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