Xuanhua Beilun Balancing Machinery Co., Ltd.
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Special rotor balance process

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LARGE FAN ROTER END DRIVE 

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How to determine a reasonable balancing accuracy

    With the development of modern industry, the precision of rotating machinery and high speed, making the elimination of machine vibration are becoming increasingly important. For rotating machinery (such as motors, blowers, diesel, cars, aircraft), its rotating parts (the following industry practice by balancing machine, referred to as the rotor) will directly affect the vibration of the machine's efficiency, life and personal safety. The unbalance of rotating machinery vibration is one of the main. Therefore, in order to effectively address the problem of machine vibration on rotating body (hereinafter referred to as the rotor) is essential for balancing school testing process measures.

Balancing machine in the rapidly growing popularity in recent years, use more widely. Its main functions are: to detect and display the size of the rotor unbalance and location, to guide the operator will try to remove the unbalance to balance the rotor precision.

Rotor imbalance, simply put, is due to deviation from the center of rotor rotation of the rotor geometric centerline. The rotor rotates the resulting centrifugal force together with the rotor rotation, the rotor and the rotor in order to stimulate the installed base (such as: bearing, frame, chassis, body, etc.) to vibrate. Therefore, it can be said: The main function is to balance the machine detects the rotor geometric center of gravity of the rotor centerline offset.

Any kind of instrument accuracy of product will have its limits, balancing machine is no exception.

Currently, most of balancing machine-made, the measurement accuracy in the micron level, while the highest domestic level of the most common machining times to stay in microns (silk, Road) level, that is, balancing machine accuracy is much higher than normal machining accuracy can be achieved.

Here are my company's series of hard bearing horizontal balancing machine of precision and general machining the rotor corresponds to the most accurate:

  

 Maximum load balancing machine (kg)

3.5—16

50—2000

3000—20000

 Limits of precision balancing machines ( µm)

0.3—0.5

0.5—1

2

  Rotor machining precision  ( µm)

3—10

5—20

20

or more

 

From the foregoing, there is no need to balance each rotor balancing machines are the limits of accuracy.

For different rotor, how to choose the best balance between a reasonable accuracy of it?

Balancing machine measurement system to accurately measure the small amount of imbalance. And this accuracy is usually much higher than the user's balance is always accuracy.

Accuracy in determining the balance of the rotor, in addition to special experiments, each rotor is not necessary to have a balance to the limit of accuracy.

According to the characteristics of different types of mechanical and practical experience, the following table lists the International Organization for Standardization issued a "typical rigid rotor balancing accuracy level."

   

Accuracy

Grade

G

mm / sec

rotor type example

 

G630

630

marine diesel engine installed in rigid crankshaft-driven pieces; rigid installation of large four-stroke engine crankshaft-driven pieces.

G250

250

high-speed four-cylinder diesel engine installed in rigid crankshaft-driven pieces.

G100

100

six-cylinder and multi-cylinder diesel engine crankshaft-driven pieces. Cars, trucks and locomotives used (gasoline, diesel) engine machine.

G40

40

car wheels, hoop wheel, the wheel as a whole; car, truck and locomotive engine crankshaft-driven pieces.

G16

16

mill, agricultural machinery parts; cars, trucks and locomotives used (gasoline, diesel) engines of individual parts.

G6.3

6.3

seagoing vessel (merchant) host worm drive gear; centrifuge, pump impeller; fan; aero gas turbine rotor parts; flywheel; general machine parts; normal motor rotor; special requirements of the individual parts of the engine.

G2.5

2.5

gas and steam turbines, including marine vessels (merchant) rigidity of the main turbine generator turbine rotor; turbine turbocharger: the machine-driven pieces; special requirements of medium and large rotor; small rotor; turbo pump.

G1

1

 tape recorder and record player-driven pieces; grinding machine driven piece; special requirements of small armature.

G0.4

0.4

precision grinding spindles, wheels and armature, gyroscopes.

Note: When the rotor balancing accuracy than G2.5 must be a self-drive or very close to the actual working conditions of drivers, supporting balanced way, be possible to get a better balancing.

The user can on the table, according to their specific circumstances rotor, a reasonable choice of balancing accuracy.

For example: general blowers, fans, pumps and other products of the rotor Optional G6.3 level. And so on.

Choosing the appropriate balance between accuracy, it shall the indicators (such as G6.3 level) are translated into operational a specific target (eg: in a radius less than the number of grams).

The following details the calculation method for the user.

Balance precision conversion method

Assuming the rotor weight W;

The actual operating speed of rotor n,

That the actual work the angular velocity ω = 2×π×n/60 or  ω  n/10;

If the accuracy of rotor balancing selection 6.3, which e×ω = 6.3 mm / sec.

Then, the rotor allows the center of gravity offset e  6.3×10000 / n (micron)

By the formula  e ×W = m× r  deduced:

Weight specified in the rotor surface radius of the specified maximum allowable unbalance m = e × W / r

The above equation:

e - the focus of the rotor correction plane offset (microns μm),

Or known than the unbalance (g.mm / kg)

m-rotor correction plane radius r on the quality of the imbalance, grams (g)

r - to where the unbalanced mass m radius, millimeter (mm)

W - rotor mass, kilograms (kg)

Operator to the target as long as the balance of the rotor m or less, can be considered to balance the rotor has been precision.

Simplified formula: permissible residual unbalance mass (g) = 9549 × total mass of the rotor (kg) × equilibrium level (G ... ...) / {actual work speed (rev / min) ×effect is the radius (mm)}.

 

For example, a motor rotor:

Total mass = 50 (kg)

Select G6.3 balance grade level

Actual operating speed for the 4-pole motor = 1450 (r / min)

Efficiency is the radius = 130 (mm)

Then, allow the quality of the residual unbalance = 9549×50×6.3 / (1450 ×130) = 15.96 (g)

 

For surface labeling problem:

There is no uniform labeling standards. Generally can be labeled as: balancing accuracy: XXX grams mm (g.mm) or XXX grams cm (g.cm).

Some drawings are marked as: G2.5--1000 rev / min, while in the drawings to provide the total mass of the rotor.

The most convenient way to mark the implementation of the operator is: specify the rotor to mark its re-location allows the residual imbalance in the corresponding quality. Such as: "In the face of R200 mm radius XXX on the quality of the residual unbalance is less than 5 grams. 

 

How to detect and determine the balance machine and balancing accuracy

What is dynamic balancing

How to make a reasonable balancing accuracy

    Our balanced electromechanical tester uses industrial single-chip technology and has a fast start-up speed, making it especially suitable for factory work environments! The technology that can be measured after turning on, memorizing and stopping, can input and change the automatic calculation result of the parameter, the electrical measurement box has the data record of the measurement result, and the measurement data sd card records the function.

Our hard-bearing balancing machine is a permanently calibrated hard-support balancing machine.

  The rotors that balance different shapes and weights do not need to be recalibrated. The size and angle of the unbalanced values can be measured at a single start.

 

Addr: Wanfeng Rd Dongmenwai Str. Xuanhua District Hebei Province China

Post code:075100

E-mail: cdf@beilun.com.cn              

Tel: +86 313-3112400  

       +86 313 3175800

Fax: +86 313 3175900

http://www.balance.net.cn

 

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