Dynamic balance tester must use dynamic balance technology to eliminate this kind of vibration

With the rapid development of modern industry, higher and higher requirements are placed on the performance of rotating machinery. 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.

Targeting the highest technology at home and abroad, using large-scale integrated circuits and microcontroller 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. Compact and lightweight, the keyboard and display are on the panel, and the input and output jacks and various control switches are placed on the panel. The whole machine can be dynamically balanced on various rotating machines, which is equivalent to a movable balancing machine. It is designed to be portable and easy to carry, the entire instrument in a portable instrument box.

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: Single or double-sided or double-sided

Vibration signal frequency band: 5Hz～1KHz

Same frequency working speed: 300～30,000 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: ≥85%

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 seat and is facing the magnetic steel with a clearance of about 5-10mm. 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 wiped clean with black paint or black tape all black, and then use scissors to cut a piece of tin foil or sticker reflective paper 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.

With a magnetic suction tube, the photoelectric sensor is facing the photoelectric sign with a clearance of 5-30mm. 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 action 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 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 measured at any angle. The principle is to measure the direction with the largest vibration amplitude and the most stable value. It is generally installed horizontally.

3.2.2 Magnetic holder is a special mounting sucker made 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 key 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.