Balancing
machine is used for testing the instrument
From an experimental point of view, each balancing machine, you
need to evaluate the measurement of each frame interference signal
to noise ratio. Recently, some disturbances about the rack were
obtained by using specialized measurement methods based on the
theoretical mechanics of the rack.
Equipped with a matching sensor function is a permanent
calibration guarantee: the design mode of the foreign balancing
machine: the signal-based manufacturing method to achieve signal
consistency (the sensitivity of each sensor has a consistency
requirements), the wobble of the interference signal to noise ratio
is determined by the structure Relatively high and designed. We now
have most of the domestic sensor signal indicators because there is
no control process in the manufacturing process of the sensitivity
parameters of the process, as well as mechanical structure design
interference signal to noise ratio is very poor. And the electrical
measurement system has not joined the matching sensor calculation
mode. So it will cause the calibration factor to not cover the scope
of work. For a change in the form of a large rotor have to
re-calibration. Has long lost the characteristics of permanent
calibration balancer. Become a smooth use of the machine. Making the
large-scale balancing machine can not work in full range.
The balancing machine is an instrument for testing and testing,
which conforms to the mechanical model and the corresponding
mathematical model for measuring the level of exciting force on both
sides. The mechanical model is the theoretical basis of mechanical
mechanics design. The mathematical model is the design basis of the
electrical measurement system. There is also a crucial model in the
actual manufacturing of the theoretical mathematical model of the
sensor mechanics. This year with the introduction of new electrical
measurement system, while the mechanical system for a new match. The
working mode of the vibration velocity sensor is carefully studied,
and its mechanical model is deduced. It has found that it has a high
interference suppression index and has very reasonable measurement
parameters.
So we re-plan our own mechanical structure and detection mode,
re-establish the corresponding mechanical model, from the
experimental point of view to set our own measurement methods to
produce a corresponding detection method of this method, used to
detect the correctness of the mechanical model, Frame interference
signal to noise ratio. Reestablishment of our own software math
calculation model, by constantly measuring the data, changing the
measurement structure, it really can meet the dynamic balance of the
formula inside the required level of exciting force data. So that
our measurement results with the foreign product vibration speed
sensor operating mode is the same.
Vibration speed sensor pendulum can not be directly changed to
the piezoelectric sensor. Because the mechanical model is different,
the mathematical model of the matching electrical measurement system
is made up. Speed sensor structure rack, directly after the
piezoelectric sensor, found that each rotor should be calibrated.
The balance of precision used to repair the industry is never
satisfactory. The biggest difference is that the working range of
the machine becomes smaller. Because the different sensors
correspond to different gripping rigidity, the use of the speed
sensor is the elastic deformation of the pendulum, the use of
piezoelectric sensors is the force-type pendulum.
Because some devices have not produced large companies, the market
is now selling the quality of the device is used to support the
quality of maintenance. For this reason forced us to improve our
products, using the latest industrial computer chips.
New technology has many advantages, while the difficulty of its
technology development is relatively high. First, the requirements
of theoretical and technical preparation are more specific and
strict.
2005 development of the HP05 51 series cpu, then the product is
part of the software function to replace the hardware solution,
improve the accuracy of the calculation.
After three years of technology development, this time finally
made a good performance of the new electrical measurement system.
The new version of the measurement of the technical development of
the box, using the latest industrial single-chip, from the technical
level to give full play to the strengths of modern computer
hardware, as far as possible in the computer internal balance
machine to deal with digital analog signals. This circuit hardware
and software structure, the most consistent with the mathematical
technology model. In the signal input process strictly for sine wave
correlation function operation. In the input digital signal circuit,
has been removed all the digital circuit, the computer directly
handle the reference signal, covering all the mechanical work
rotation conditions. The test box increases the data of the sensor
signal and the static balance value of the supporting point, and the
sensor condition is displayed by this method to judge the best
balance result of the fan. As much as possible for our customers
more services, but also our product innovation.
Our electronic measurement system software technology structure,
all are self-compiled source code hex file. One of the liquid
crystal display system is also the development of their own source
code, compiled into a complete industrial microcontroller hex file
system. This shows that we have a single chip system graphics
software development capabilities. Has its own proprietary
intellectual property rights. Do not use the factory with the basic
operating software with the property description.
Now more software technology products are based on computational
models, programming techniques. Strict mathematical relations
correspond to strict calculation results. Sampling, filtering high
precision and high stability is also appropriate to filter the
mathematical model after the establishment of the calculation.
Our mathematical model of balancing machines can not learn abroad
because our products are made for use by people. Products have low
cost, low failure rate, but also easy to use, so from the beginning
have to optimize the product structure. For this reason it looks
like our rack is large and strong, while bringing more advantages -
with a particularly large overload capacity. Customers can use our
machines to be overdated.
Now 32-bit cpu is the leading product, due to the increase in
computing speed, memory and cache increased, to the complex
computing provides ample environment margin.
HP15 and HP16 main signal processing began using 32-bit cpu.
HP-15 hard bearing balancing machine computer measuring instrument
is a balancing machine dedicated computer: high reliability
industrial computer chip circuit, 220vac power work, strong
anti-interference, to adapt to unstable power conditions, for
unstable speed can also be measured. It is the hardware processing
analog signal at least the circuit structure. Two analog signals are
used in synchronous sampling mode. Its pulse circuit hardware only
one input buffer circuit. Software vector solution measurement data,
graphics and digital display. A full 4-digit display of input
parameters, static balance display, sensor output display, you can
set the parameters of the data stability. Application of the latest
computer technology, high-speed dynamic sampling, a comprehensive
vector solution, a new hardware structure.
With the latest 32-bit Cpu industrial computer chip, high-speed
dynamic sin cos function weighted sampling, can be set parameters of
the digital optimization of dynamic filtering.
Using AC sampling, theoretically avoid zero interference.
The reference signal uses the computer direct processing mode, so
the phase-locked loop circuit beyond the limit of the speed range,
can completely cover the mechanical operation can exist in the speed
range.
Solution mode flexibility, the user can self-calibration, you can
also restore the factory calibration.
Test results report card using sd card or tf card storage. 1,000
report records, and report records. Can be flexibly moved to the pc
machine for direct report printing, no need to re-format, file
format editing or not. As a result of txt file output, the phone can
also see the contents of the report.
The formula of correcting plane
separation with hard support
The correction
plane separation is performed.
It should be
noted that the constants appearing in the formula for
correcting plane separation of hard support are all
geometric dimensions, while in the case of soft support,
besides geometric dimensions, there are mass and moment
of inertia, and these values are not only for the rotor
itself, but also for the parasitic mass.
The geometric
dimension can be measured simply, but other quantities
mentioned above cannot be measured simply. Therefore,
when balancing, it is necessary to reset the correction
plane separation circuit whenever the type of rotor
changes.
Figure 3.7
geometric dimension between rotor bearing and correction
plane
In the case of
hard support, as long as the dimensions of a, B and C
are measured and the correction plane separation circuit
is placed, the setting is completed. In the case of soft
support, the test weight must be applied on the rotor
and the rotor must rotate, and the test results must be
used according to certain steps
To set the
constant of the separation circuit. Moreover, by the
formula under the condition of soft support
It can be seen
that even if the sensitivity (indicating the correction
unbalance size [g] or [g ， cm] corresponding to the
scale) is changed, it is necessary to calibrate again
under the rotating state of the rotor according to the
test weight with known mass. The above operation of soft
support balancing machine is called calibration
operation. One of the biggest characteristics of hard
support balancing machine is that it can set the
calibration plane separation circuit without the above
calibration operation. And the size of correction can be
indicated by absolute quantity.
