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Vibration meter is an instrument used to directly indicate the peak value, peak-to-peak value, average value or root mean square value of vibration quantities such as displacement, velocity, acceleration and acceleration derivative. The main parts of this instrument are integral and differential circuit, amplifier circuit, voltage detector and meter. The integral and differential circuit is used to complete the integral and differential operations between the above-mentioned vibration quantities. Generally, integral and differential operational amplifiers can be used, and low-pass filters and high-pass filters can be used to complete the integral and differential operations. However, when calculating with such instruments, attention should be paid to their application frequency range. Vibration meters can only allow people to obtain the total intensity of vibration (vibration level), but can not obtain other information, so the scope of use is limited. For the vibration measurement method, it is required that it does not have any influence on the vibration process to be measured. Therefore, if a point away from the measured object can be used as a static reference point, it is ideal to measure vibration by a non-contact method. However, when measuring the vibration of a running vehicle, there are many cases where a stationary point as a reference cannot be obtained. In this case, an inertial vibrator is often installed on the measurement object to indirectly measure the vibration of the measured object from the movement of the vibrator. In fact, most of the vibration measurements are carried out using inertial vibrometers with vibrators. Even in the case where the reference static point can be found, many such vibrometers are used. Therefore, the general vibrometer often refers to this inertial vibrator using vibrators.

The multi-functional mechanical vibration analyzer is a basic instrument for the factory to carry out condition monitoring and realize predictive maintenance. It is a powerful tool for equipment reliability management and TPM. Its simple operation is suitable for equipment maintenance and inspection personnel, as well as production operators, for measuring, recording and tracking machine status, detecting abnormalities, and enabling diagnosis and trend monitoring of common machine vibration failures. Vibration analyzers are generally piezoelectric, and there are roughly two structural forms: ①compression type; ②shear type. The principle of vibration analyzer is designed by using the piezoelectric effect of quartz crystal and artificially polarized ceramics (PZT). When a quartz crystal or artificially polarized ceramic is subjected to mechanical stress, charges are generated on its surface, and the resulting charge density has a strict linear relationship with the applied mechanical stress. At the same time, the mechanical stress is proportional to the acceleration value under the condition of a certain sensitive mass. Under certain conditions, the charge generated by the piezoelectric crystal is proportional to the acceleration value felt.

The portable balancer has embedded computer technology and dynamic balancing technology, and has many functions such as on-site vibration data measurement, vibration analysis, and single- and double-sided dynamic balancing. It is simple and easy to use. It is the most ideal tool for industrial and mining enterprises to predict maintenance and repair, especially for fans, motors and other equipment manufacturers and vibration technical service organizations. It is an American cutting-edge technology product. It has 1. Perfect application functions: it can perform single-sided and double-sided imbalance correction, and provides single- and dual-channel vibration analysis, dynamic balance fast acquisition, vector decomposition and synthesis calculation, ISO permissible imbalance query and other practical functions; 2. Excellent instrument performance; 3. Microsoft WindowsCE operating system, stable and efficient; 4. 400MHZ high-performance embedded microprocessor with powerful data processing capability; 5. High-density FPGA chip provides accurate data acquisition control; 6. The low-noise circuit board manufacturing process and the hardware gain of up to 1024 times make the resolution of the vibration signal up to 0.001um, and the balance accuracy is better than the national standard; 7. Up to 1G data storage capacity, can store 10,000 sets of on-site balance process records; 8. Using low-power hardware design, intelligent power management and large-capacity lithium battery pack, the KMBALancer can work continuously for more than 7 hours after a single charge.

The balancing machine is an instrument used to measure the unbalance of the rotor. The balancing machine is a hard-supported balancing machine. The rigidity of the swing frame is very large. The measurement results of the dynamic balancing machine are used to correct the unbalance of the rotor, so that the vibration generated when the rotor rotates or acts on the rotor. The vibration on the bearing is reduced to the allowable range to achieve the purpose of reducing vibration, improving performance and improving product quality. A balancing machine is a machine that measures the size and position of the unbalance of a rotating object (rotor). Centrifugal force is generated as the rotor rotates around its axis due to the uneven distribution of mass relative to the axis. The 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 balancing machine should be used for testing. Rotating parts such as motor rotors, machine tool spindles, fan impellers, steam turbine rotors, auto parts and air-conditioning blades all need to be balanced to operate smoothly and normally during the manufacturing process. Correcting the unbalance of the rotor according to the data measured by the balancing machine can improve the mass distribution of the rotor relative to the axis, and reduce the vibration generated when the rotor rotates or the vibration force acting on the bearing within the allowable range. Therefore, balancing machines are essential equipment for reducing vibration, improving performance and improving quality. Usually, the balance of the rotor includes two steps of unbalance measurement and correction. The balancing machine is mainly used for the measurement of unbalance.

The online monitoring system is a combination of monitoring and wireless transmission technology. It can transmit on-site information from different locations to the wireless monitoring center through wireless communication in real time, and automatically form a video database for future retrieval. The biggest advantage of arranging a online monitoring system outdoors is that there are no large buildings blocking it. Therefore, there is no need to think too much about the problem of wireless signal passing through the wall, and the wireless network cameras in the outdoor wireless monitoring system are generally scattered, but the interference of some external signals should also be considered. The establishment of the external online monitoring system should be determined according to the distance between the wireless network camera and the monitoring center. If the distance between them does not exceed 400 meters (theoretical value), the monitoring signal can be received directly through the wireless AP of the monitoring center. If the distance between the wireless network camera and the monitoring center is within 1 km, and a wireless AP can be added near the wireless network camera, then it is necessary to consider using a wireless network bridge to realize data transmission. In theory, it can monitor scenes with a distance of up to 50 kilometers. If the monitoring distance needs to be longer, the relay method can be used, and the two wireless bridges can be placed back-to-back to extend the wireless signal transmission distance.

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