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中文a
Special rotor balance process
METERS
for Balancer
LARGE FAN ROTER END DRIVE
BALANCER
Universal BALANCER
YFW-16000
YFW-10000
YFW-3000
YFW-300
YYQ-160
YYW-30
RYQ-5 |
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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 |
eω
（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.
Address: Wanfeng Rd Dongmenwai Str. Xuanhua Hebei Province China
Post code:075100
Tel: +86 313 3175800
冀ICP备05002859号-2 冀ICP备05002859号-1
 冀公安备13070502000109
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