The vibration detector (VIB05) is a microprocessor-based machine condition monitoring instrument with vibration detection, bearing status analysis and infrared temperature measurement. The operation is simple, and the status alarm is automatically indicated. It is very suitable for the field equipment operation and maintenance personnel to monitor the equipment status, find problems in time, and ensure the normal and reliable operation of the equipment.
basic introduction
The vibrometer is also called the vibration meter vibrating analyzer or the vibrating pen. It is designed by the piezoelectric effect of quartz crystal and artificially polarized ceramic (PZT). It is widely used in machinery manufacturing, electric power, metallurgy and other fields.
In order to modernize equipment management, factories should actively implement advanced equipment management methods and equipment maintenance techniques based on equipment condition monitoring. Equipment condition monitoring and fault diagnosis techniques are prerequisites for preventive maintenance of equipment. Especially for heavy industry enterprises, with strong work continuity and high safety and reliability requirements, through condition monitoring
Vibration measurement principle
The vibrometer is also called the vibration meter vibrating analyzer or the vibrating pen. It is designed by the piezoelectric effect of quartz crystal and artificially polarized ceramic (PZT). When a quartz crystal or an artificially polarized ceramic is subjected to mechanical stress, a charge is generated on the surface. The piezoelectric acceleration sensor is used to convert the vibration signal into an electrical signal. Through the processing and analysis of the input signal, the acceleration, velocity and displacement values ​​of the vibration are displayed, and the corresponding measured value can be printed by the printer. The technical performance of this instrument is in line with the international standard ISO2954 and the Chinese national standard GB/T13824. For the vibration intensity measuring instrument, the requirements of the sinusoidal excitation method vibration standard. It is widely used in machinery manufacturing, power, metallurgy and other fields.
main feature
Vibration testing is an important means of achieving equipment status and fault diagnosis. The use of hand-held vibrometers increases production safety, production quality and production efficiency. Therefore, the research on hand-held vibrometer is of great significance and practical value. This paper analyzes the development of vibration tester and the development of vibration test system at home and abroad. For the vibration tester, there are limitations such as single system function or high price. Combined with the application of single chip microcomputer, it focuses on high precision, small size, strong function and anti-interference. A strong, low-cost handheld vibrometer. Mainly carried out the following aspects of work: 1. According to the overall design of the handheld vibrometer, the circuit block diagram is given and the specific circuit of the PCB is advertised by Protel99SE software, and the important parameters of the circuit are analyzed and calculated. Various anti-interference measures have been taken in both hardware and software to ensure the accuracy of the measurement and improve the reliability of the instrument. 2. Fully understand the vibration measurement system. Based on the existing piezoelectric acceleration sensor and charge amplifier vibration measurement system, an integrated handheld vibration meter with built-in miniature dual-charge amplifier and frequency compensation circuit is designed. 3. Adopt ZOOMFFT algorithm in data processing to improve the accuracy of measurement; use the principle of embedded system to create data file storage system, improve reading speed, save space of single-chip RAM; communication adopts USB interface, greatly improved The speed of data transmission and provides a good foundation for secondary development.
1. The vibrometer is advanced in design, featuring low power consumption, reliable performance, beautiful appearance and extremely convenient carrying.
2, according to the national standard manufacturing, the measured value and the international vibration intensity standard (ISO2372) comparison can directly determine the equipment operating status.
3, high reliability ring shear acceleration sensor, performance is far superior to compression sensor.
4, with high
The low frequency binning function makes it easy to identify the type of equipment failure during vibration measurement.
5, with a signal input function, coupled with a temperature sensor, you can measure the temperature.
6. It has signal output function, optional special earphone, and equipment stethoscope function; it can be used to monitor and record vibration information.
7. According to the connection mode of the vibration sensor and the host computer, it can be divided into one type and split type for you to choose.
8, suitable for vibration and temperature measurement of various types of machinery.
Fold edit this paragraph classification
Folding hand-held vibrometer
Hand-held vibrometers are designed according to national standard series test standards and instrument standards. The circuit design is advanced, all integrated circuits are used, and the charge conversion stage is placed in the probe, which has the advantages of low noise, anti-interference, and can be connected by thick cables.
Blasting vibrometer
The blasting vibrometer is applied to the blasting measurement project. It is a vibration measuring instrument specially used to record and analyze the blasting vibration data. The instrument can form an intelligent test system with the sensor and data analysis system.
Instructions
1. Measurement of measuring point of vibration measuring table: Using the vibration measuring table, the bearing and axial end point of the main equipment are tested, and the on-site inspection record table is provided, and each measuring point must correspond to each other.
2. Measurement period: It should be measured once every two weeks after the equipment is overhauled or close to overhaul; once every month during normal operation; if there is a significant change between the measured value and the previous measurement, the test density should be strengthened to Prevent accidents and cause downtime.
3. Basis for determining the measured value: Refer to the international standard ISO2372.
Speed: 600~1200r/min, vibration measurement range: 10~1000Hz. Generally, when the equipment is in normal operation, the detection speed value is in the range of 4.5~11.2mm/s (units above 75kW) for monitoring use. If it exceeds 7.1mm/s, it is necessary to consider major repairs. In addition to considering the motor capacity of the equipment, the determination of this value should also consider the aspects of strong work continuity and high safety and reliability. In short, the vibration meter is used in conjunction with other testing instruments to facilitate analysis of the operating state of the equipment. If the vibration meter is used together with oil quality analyzer, motor fault detector, alignment instrument, etc., it can more accurately judge the operation of the equipment.
Requirements for blasting vibrometers in blasting site environment
The vibrometer needs to have the advantages of small size, light weight, high sensitivity, multiple functions, convenient use, high degree of automation, large memory capacity, and diverse data transmission interfaces, so that it can be applied to the special environment of the blasting site. The specific requirements are as follows:
â—† The vibrometer can be powered by battery and can be placed freely at any position on the test site for easy wiring.
â—† The vibrometer should be light and portable, with a strong outer casing and strong impact and vibration resistance;
â—† Each data recording channel of the vibrometer should have a certain data record length, which can ensure the maximum value of the seismic wave of each measuring point in the on-site blasting;
â—† The vibrometer should have multiple ranges, each channel can be set separately, and can be easily changed at the test site to adapt to different sensor installation positions;
â—† Provide supporting vibration measurement software, which can estimate the charge amount, vibration speed, etc. according to the measured data, and facilitate adjustment of the blasting parameters;
â—† Ability to automatically generate test reports based on recorded waveforms and data
Blasting vibration measurement system
During the blasting test, the blasting vibrometer is placed at the vibration test point, and the measuring points can be distributed over a large area. The blasting vibrometer automatically performs signal conditioning and storage on the dynamic and static analog signals generated by the sensor (including speed, acceleration, pressure, strain, temperature, etc.). After the test is completed, it can directly communicate with the computer and transmit data through the USB interface on the instrument. Combined with the supporting software for further data analysis and processing. The blasting site layout diagram is as follows, and is composed of vertical and horizontal velocity sensors.
Different types of vibrometers can be used depending on the test requirements. Before the blasting field test, the user can start the acquisition by simply setting the parameters, and then the scene can be evacuated. When the seismic wave signal is transmitted, the vibrometer will automatically record the dynamic waveform of the entire seismic wave and convert it into digital signal storage. , then can be connected to the desktop or laptop through the USB interface, using the supporting software for data processing and analysis
Measurement method
1. The application of the vibration meter to the state detection of the equipment, although not the only basis for the equipment overhaul cycle, but as a reference condition is indeed very necessary. Because the speed of pumps, fans and other equipment is low, the damage caused by vibration is not unique. For example, sometimes there is no problem with the vibrometer, but the impeller is severely corroded and needs to be overhauled. Therefore, it is determined that the equipment overhaul period should be comprehensively considered from the aspects of the vibration meter test results, the cumulative operation time of the equipment, and the efficiency.
2, the application of vibration meter detection, as a means of equipment after the overhaul is also very necessary. It should be pointed out that due to the different degrees of old and new equipment, the inspection value of the acceptance is not uniformly defined. It should be based on the detection value of the pump group before the overhaul, and the inspection value of the repair value is not made. Uniform provisions shall be based on the test value before the overhaul of the pump set being accepted, and the repair value shall be lower than the pre-repair value. In addition, the application of the vibrometer can also find pump group installation problems (including poor alignment, long-term loosening of anchor bolts), and cavitation of the pump.
In short, the vibrometer is used in conjunction with other testing instruments to facilitate analysis of the operating state of the equipment. If the vibrometer is used together with instruments such as oil quality analyzer and motor fault detector, it can more accurately judge the operation of the equipment.
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