When the center of mass of the rotating equipment is not coincident with the center of rotation due to various reasons, vibration may occur due to centrifugal force. The vibration seriously affects the accuracy of the equipment and shortens the life of the support bearing. To eliminate this vibration must use balancing technology.
VT series dynamic balance measuring instrument is aimed at the highest technology at home and abroad, adopting large-scale integrated circuit and single chip microcomputer technology. The instrument is versatile and can be used both as a tachometer and as a vibration tester. Both time domain analysis and frequency domain analysis can be performed. In particular, it has all the functions for measuring dynamic balance.
The instrument is simple to operate, man-machine dialogue, menu prompts, measurement data can be locked and maintained at any time. VT dynamic balance instrument is compact and light weight. The keyboard and display are on the panel. Input and output jacks and various control switches are placed on the panel. VT800 balancing instrument can perform dynamic balance on the whole machine for various rotating machines, which is equivalent to a movable balancing machine. It is designed to be portable and easy to carry. The entire instrument is housed in a portable instrument box. In addition to the general dynamic balancing function, the VT800 is also specially designed for the balance of the whole maneuvering balance of horizontal spiral centrifuges and disc centrifuges. It has added anti-jamming capability and can easily measure differential speed composite drums. Body vibration and dynamic balance of the whole machine. -- Baoying Baofei Vibration Instrument Factory
Technical Parameters
1. General measurement:
Speed ​​measurement: 30 to 30,000 rpm
Vibration measurement: 0.01 to 5000μm (peak to peak)
0.01～2000mm/s (effective value)
Vibration Analysis: FFT Spectrum Analysis
Display mode: dot matrix graphic 64X240 dot matrix graphic LCD Chinese cuisine
Keyboard: Eight keys
2. Balance measurement:
Measured points: Dual Channel Single or single side Double or double sided
Vibration signal frequency band: 3Hz～1KHz
Same frequency working speed: 180～30,000 rpm
Co-frequency amplitude range: 0.01 to 5000 μm (peak to peak)
Vibrating intensity range: 0.01～2000mm/s (RMS)
Phase accuracy: 0-360°±1°
Reduction rate of imbalance: ≥95%
Note:
1) When using ultra-low frequency magnetic sensor or eddy current sensor to measure vibration signal, the same frequency working speed can be reduced to 30 rpm.
2) When the working speed of the equipment is greater than 10,000 rpm, please purchase a laser speed sensor.
Three, three important requirements in dynamic balance measurement
3.1, installation of speed sensor
3.1.1 Hall speed sensor should be connected to the photoelectric input socket on the instrument panel (pay attention to the position of the concave and convex on the four-pin socket plug). When using a Hall sensor, small magnetic steel should be placed on the pulley or rotor plane as a zero phase mark. The hall sensor is fixed with a hose magnetic base and is facing the magnetic steel with a clearance of about 10mm. After the power is turned on, the indicator light on the Hall sensor is on, and the light is off when leaving. When the low-frequency rotation Hall sensor light is flashing, the panel light is also flashing. There should be a corresponding stable speed display on the instrument.
Placement of small magnets Note: 1. Magnetic steel has two sides. The circled mark faces outward, facing the hall sensor, otherwise it will not be output. 2. In order to increase the magnet suction and prevent the rotor from flying at high speed when the rotor is running at a high speed, please use 502 glue to drip around the magnet. 3. The magnet is best placed on the plane, if there is a hole in the plane; there is a slot; there is a fly along the place where it is more safe and reliable.
3.1.2 When using a photoelectric speed sensor, first make a photoelectric sign on the shaft. Photoelectric sign is usually black / white mark, the shaft surface is cleaned with black paint or black tape all black, and then use scissors to cut a piece of tin foil or self-adhesive reflective paper is attached to it, the width of the reflective paper should be depending on the shaft diameter However, the large-diameter hinge mark should be wider. Photoelectric signs require clear black and white, neat edges, and better use of special reflective paper.
The magnetic sensor is placed opposite the photoelectric sign with a magnetic suction tube, and the gap is between 5 and 10 mm. Pay attention to observe the orange light emitting tube (action indicator) on the photoelectric sensor, and the action indicator should keep flashing when receiving the reflected signal. Adjust the sensitivity knob on the photoelectric sensor so that the operation indicator light flashes continuously (at this time, please pay attention to safety). The instrument has a corresponding stable speed display. Otherwise, adjust the photo sensor distance or redo the photoelectric sign.
3.2, vibration sensor installation
3.2.1 The vibration sensor is used to pick up the absolute vibration signal of the equipment. When using, the magnetic holder is firmly sucked on the point to be measured, which means the bearing seat supporting the rotor, and the closer to the bearing seat, the better. The sensor can be used in both vertical and horizontal directions. The general vibration sensor is installed horizontally.
3.2.2 Magnetic holder is a special mounting sucker composed of ferronickel high-strength magnetic steel and specially designed magnetic circuit. The top M5 screw can be just screwed into the screw hole in the lower part of the vibration sensor. This kind of magnetic holder can be very convenient for the sensor. Mounted on ferromagnetic material bearing housings, and for non-ferromagnetic material equipment, the user needs to make another hole, drill wire to fix, screwing screw depth should be less than 5mm. Magnetic suction is very large and it is very easy to hold your fingers. The operation should be very safe.
3.3, determine the phase angle
The Hall sensor places the position of small magnets as the zero degree of the phase angle. Photoelectric sensor with a white photoelectric sign position, as the phase angle of zero. All of them are phase angles in the reverse direction of the rotor rotation direction. This must not be mistaken, otherwise the results of dynamic balance calculation become worse and worse.
The stable rotation speed measurement, stable vibration signal measurement, and correct phase angle definition are the keys to the success or failure of the dynamic balance calculation results.
The mounting position of the vibration sensor and speed sensor should always remain unchanged.
Some explanations on the operation of the instrument
4.1,|Keep|Keys Function During Measurement
During the measurement process, the measured parameter may change, which causes the parameter value on the display to flicker. For this purpose, you can press / hold | to permanently display the parameter at a certain moment for observation or selection. At this time, the screen The ** mark appears in the upper right corner. If you press the | | key again, the ** mark disappears and the number on the display continues to flash.
If you are satisfied with the measured amount of vibration in the dynamic balance measurement, you can press | hold|| to hold the data on the display. Press | to execute the | key to save the data and prompt you for the next operation.
4.2 Speed ​​rms and shift peak-to-peak measurement switching
In the measurement state, press the |+| key to switch between the speed effective value (mm/s) and the displacement peak-to-peak value (um), and press the |+| key once to switch. In the dynamic balance measurement, when the measured vibration signal is large, the effective speed is usually used, and the unit is mm/s. Vibration signal hours with displacement measurement, the unit is um, u is displayed on the screen.
4.3 Magnification selection
In the measurement state, the xN value displayed in the upper left corner of the screen is the magnification. Press the â–² and â–¼ keys to select the magnification again. There are four steps for the magnification of the instrument: x0.1, x1, x10 and x100. In the displacement measurement process, if 999u digits appear on the display, it means that the digits overflow and the X0.1 range should be switched. If a 1u figure appears on the display, the vibration signal is very small and the X10 range should be switched.
4.4 Preset speed
In the dynamic balance measurement, when the actual speed ≥ the preset speed, the instrument enters the hold state, which is equivalent to pressing the |Keep|. The instrument software design preset speed = 400000rpm, in most cases are not used, please press | execution | key to skip.
4.5 channel switch
In the vibration measurement, the switching of the A channel and the B channel is realized by using the ? key. In the dynamic balance measurement, the single plane measurement is fixed in the A channel, and the channel switching of the dual plane measurement is performed automatically.
4.6 Bandwidth Selection
Balancing filter bandwidth. You can choose narrowband (0.2Hz), medium (1Hz), wideband (5Hz). Medium bandwidth is generally used in dynamic balance testing. If the disturbance in the field is large, the displayed vibration value and phase angle change greatly, or the double rotor measurement, narrowband bandwidth can be selected. In the low-speed dynamic balance test, broadband bandwidth can be selected to speed up the display of measurement values.
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