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Interpreting How To Ensure The Accuracy Of HVI Test Results

2014/1/7 20:18:00 30

HVI Accuracy Semi Automated Cotton Tester

MA Luo module mainly tests the micron value and maturity of cotton; the length / intensity module mainly tests cotton length, length uniformity, short fiber content, breaking strength and elongation at break; the color / impurity module mainly tests cotton reflectivity, yellowness, color grade, impurity particle number, impurity area and impurity grade.

The following are the following aspects: how to control cotton reflectivity, yellowness, color grade, micron value, length, length uniformity and fracture strength index, and explain from 8 aspects, such as power supply, air pressure, vacuum, environment, instrument, calibration, operation and maintenance.

1 check the voltage of each part of HVI to ensure the voltage stability is normal .

HVI different moving parts have different voltage requirements, so the maintainer should check the voltage before putting into use.

Check 36V voltage, ensure track motor, length measuring motor, brush motor, sampler motor and stepping motor driver work normally; check 24V voltage to ensure normal operation of valve group, Mark Ron Men sensor, vacuum motor, power box fan, main gas source and brush; check 12V voltage, ensure that the color head works normally; check 3V, 5V and + 15V voltage, ensure that the control board, long strong control board sensor and microprocessor are working normally.

24V, 5V, 3V and + 15V are checked by entering the system diagnostic equine clone and length / strength control board. All these voltage errors are within + 5%. Check the 12V input voltage through the opening and closing of xenon lamp. When the xenon lamp is not lit, the voltage will be within 12V + 0.1V, and the voltage will be reduced by about 0.3V. The motor voltage will be checked by various motor tests of the length / intensity control board, or the voltage of the length / strength power box will be tested directly with multimeter, which does not comply with timely maintenance or replacement.

2 for airflow check and air valve adjustment to meet the HVI different parts pressure requirements /p >

the main air flow into HVI must be clean and dry gas. The input air pressure is 6895Pa (i.e. 100psi), and the airflow speed can be controlled by slow opening valve.

each component has different requirements for airflow and is controlled by corresponding air valves.

The valve has been adjusted in the installation of HVI, and generally does not need to be adjusted. However, with the malfunction of HVI, maintenance personnel need to check and adjust the valve.

It should be emphasized that the front and rear clamps must reach about 300000 Pa (i.e. 3bar) at closing time to ensure the normal work of the front and rear clamps, the closure of the clonus airflow, and the precision control valve pressure up to 82740Pa to 103425Pa (12psi to 15psi), in order to ensure the level of the micronan test.

It does not conform to the requirements of HVIC1000 setting and adjustment.

3, check HVI vacuum to avoid waste cotton residue impact test /p >

when testing cotton length and strength, it is necessary to adsorb the free fibers from brush brush and the waste cotton held by the broken clip of the brush to the vacuum box. The vacuum readings required by HVI are different from those of the sampler and brush, which are 0.59 and 0.62 respectively, and the allowable difference is 0.07.

Through the system diagnosis, enter the length / intensity control board, turn on the vacuum motor, click the sampler and brush on the mouse, and observe the corresponding readings.

Failure to comply with maintenance personnel need to check whether the vacuum tube is blocked, whether the filter screen of waste cotton box is intact and whether the vacuum motor operates normally.

4, regulating the temperature and humidity of the laboratory and the moisture content of cotton samples meet the requirements of HVI test /p >

HVI required laboratory temperature in the testing process: (20 + 2) C, relative humidity: (65 + 3)%.

The requirement of temperature and humidity is first manifested in the requirement of HVI for temperature and humidity. If the temperature is too high, the oxidation of some components will be accelerated. Too much humidity can cause short circuit and affect the service life of HVI.

Next is to calibrate the cotton sample's requirement for temperature and humidity.

Because cotton has the phenomenon of water absorption and drainage, and cotton moisture has a great influence on cotton length and strength, calibration cotton sample is balanced to ensure that the calibration cotton sample is consistent with the ambient temperature and humidity required by HVI, so that the calibration cotton sample can absorb and release moisture to achieve dynamic balance, reduce the influence of calibration cotton moisture fluctuation on HVI calibration quality, and ensure that HVI is calibrated to the best condition.

The second is the requirement of temperature and humidity for testing samples.

Through balancing, the moisture content of the test sample is equal to that of the calibrated cotton sample, and it is at the same test level, so as to ensure the accuracy and stability of the test results.

equipment maintenance staff should ensure that the air conditioner operates normally, so that the laboratory temperature and humidity meet the inspection requirements.

HVI maintenance personnel and operators should check the cotton sample balance time and moisture before carrying out HVI calibration and testing. The cotton sample should be balanced for at least 48 hours, and moisture regain reached 6.5% ~ 8.8%, preferably from 7% to 8%;

test cotton sample balance is not less than 24 hours, moisture regain is 6.5% ~ 8.8%.

The temperature and humidity of the laboratory should be kept normal during the whole inspection process, otherwise the temperature and humidity should be controlled.

5 set up adjustment machinery to ensure HVI running normally /p >

maintenance personnel should check the power supply voltage, airflow pressure, vacuum pressure and temperature and humidity under normal condition. Mechanical adjustment and operation check of HVI shall be carried out, and the specific settings shall be adjusted according to the HVIC1000 setting and adjustment requirements.

the setting of length / intensity modules is to check various sensors, set up various intelligent motor positions and adjust the optical zeros of the analog board. These checks and settings need to enter the system diagnosis, mainly through the corresponding diagnostic screen check setup of the length / intensity control panel, and at the same time, combined with the use of HVI special tools.

The other is mechanical adjustment, which is mainly set to adjust the distance between the brush and the brush, the sampler and the breaker, the setting of the pulley and the brake of the sampler, and the setting of the brush pressure.

These settings must be adjusted using HVI specific tools.

the setup of the Macon module and the color / impurity module is mainly adjusted to set the sensor positions of each component, mainly through the diagnostic screen of the Macon control panel.

When necessary, adjust the pressure of the position sensor, the clone cavity and the color / impurity pressure.

after all the settings are completed, the running parts of the moving parts are checked by cotton. The length / strength module mainly checks whether the left and right comb switches are normal, whether the cotton bundles are carding at sampling time, whether the residual clothing of the card clothing, whether the combing cotton fibers are clean and even, and whether the breaking device is set is reasonable, etc.; the Mclon module and the color / impurity module mainly inspect the operation of the horse's cylinder, such as the forward and backward steps, the switch of the horse's door, the movement of the color / impurity, the movement of the front and back of the tray and the rise and fall of the stopping rod.

Identify problems and set up adjustments accordingly.

6 through calibration, the < a href= "//www.sjfzxm.com/news/index_c.asp > HVI < /a > is corrected to standard substance level /p >

Due to motion, vibration, maintenance, installation and other reasons, the level of HVI hardware will change frequently, so HVI should be revised to standard substance level.

The maintenance personnel need to perform length / intensity calibration, equine calibration, color calibration and impurity calibration. The specific steps are entered into the HVI software calibration menu and completed according to the prompts.

In addition to manual calibration for the delay calibration of the back clamp, the HVI software will automatically indicate whether the other calibration is passed or not.

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< --EndFragment-- > should pay attention to: length / strength module calibration includes the time calibration of the back clamp, deformation calibration, lens to break point calibration and cotton calibration, these calibration need to be carried out sequentially, because these calibration support each other.

The calibration of micron is mainly air flow calibration and cotton calibration.

MA Lun passed the calibration and then checked the calibration results with the equine cloning test.

The specific method is to enter the test of the equine cloning module. The test samples were calibrated 5 times with low, medium and high horse samples. The weight of the samples was 9.50g, 9.75g, 10.0g, 10.25g and 10.50g. The average and standard deviation of the test results were observed. The difference between the average and the standard values of each calibration cotton sample 5 times was within 0.08, and the standard deviation was not greater than 0.07.

length / strength calibration is adopted, and calibration results are verified again with short / weak and long / strong calibration cotton samples.

Enter the length / strength module test, and verify the two calibration cotton samples 8 times. Observe the operation and test results of the instrument. The average value of the average length test value of the 8 upper half of the two cotton samples is within the standard value of + 0.38mm (+ 0.015 inches). The average standard deviation is not greater than 0.012. The average length uniformity is within the standard value of + 0.9, the mean value of standard deviation is not more than 0.8; the average value of the fracture strength is within the standard value of + 0.0128N/tex (i.e., 1.3gl/tex), the mean value of standard deviation is not greater than 1, the average value of the clones is within the standard value of 0.11, and the average value of the standard deviation is not greater than 0.10.

failure of calibration should first consider whether there is any problem in the calibration substance itself, such as whether the cotton sample is mixed contamination, the number of failures or repeated use is too large, and the standard value of the porcelain plate is drifting or unclean.

Secondly, we should eliminate the problem of manipulation. For example, when Malcom calibrated, the balance reading was not consistent with the software display readings. When cotton was stuffed into the clone cavity, there was a phenomenon of discarding cotton. When the length / intensity was calibrated, the sampling surface was not replaced in time, and the cotton sample was not loosed; the color calibration did not preheat the color head and correct the porcelain plate; the impurity calibration time test window was not clean and had plucent phenomena.

On the basis of eliminating calibration substances, calibration techniques, environmental temperature and humidity and calibrating cotton samples, we must carefully observe the data and carefully analyze the causes.

For example, if the length calibration fails, the luminous flux must be checked, the optical zero adjustment should be carried out for the failure of strength, the failure of the equine calibration, the check of whether the gas bridge is blocked by cotton, the inaccurate setting of the clone cavity, and so on. If necessary, clean the air bridge and adjust the cavity; if the color calibration fails, check the color head voltage and the wiring connection.

to ensure that the calibration is passed, otherwise the relevant voltage, air pressure, cotton sample moisture should be checked again, and < a href= "//www.sjfzxm.com/news/index_c.asp" > Mechanical setting < /a >.

7 strictly enforce the calibration and operation standards to ensure that the test results

The work of is complete and HVI should be in good condition.

The accuracy of the test results depends on the operator's operation.

Operators should strictly calibrate, calibrate and check the samples according to the HVI calibration specifications and operation procedures. It is found that the abnormal running state and data changes of the HVI will be checked and maintained by the times maintenance personnel to ensure that the inspection data are true and reliable.

For different modules, we should pay attention to the following questions:

1. < a href= "//www.sjfzxm.com/news/index_c.asp" > "clone" module < /a > test /p >

one is to rip up the cotton fibers before weighing, remove the coarse impurities and non cotton fibers in the fibers.

Two is the weighing, the balance should be set up 0, and the accuracy of weighing, to ensure the quality of cotton fiber between 9.5g to 10.5G, and as close to 10.0g as possible.

Check whether the cotton weight on the balance is in accordance with the weight of the HVI screen.

The three is to use both hands to evenly fill the cotton fiber and the clones.

The four is to calibrate and calibrate cotton samples, which can not be reused without restriction, and use at most 3 times. Once agglomeration is necessary, it must be discarded.

Five, calibration inspection should be carried out in strict accordance with the HVI calibration standard. Each calibration check must use one of the high and low horse test cotton samples, and two consecutive calibration tests can not use the same verification cotton sample, and ensure that each verification cotton sample is used at random.

2. length / strength module test

1 put the 8g ~ 12g cotton sample into the two sampler window respectively, and the sample must be representative enough. The sample should be loosened by hand.

Two the cotton sample in the sampler should be loose and uniform, covering all the sampling holes on the sampler, so as to avoid caking holes or holes in the sampler hole.

Three when large (or small) samples are found, place less (or more) cotton samples in the sampler or place the cotton sample on the bottom of the sampler to make contact with less (or more) sampling holes.

Four when calibrating, calibrating and repeating the same sample, each sample should be loosed and turned over for each test. When the sample is less than 8g, it should be added appropriately, but not more than 12g.

Five the samples in the sampler were repeated for 15 times and abandoned in time.

Six carefully observe the sampler sampling, brush combing, comb broken cotton status and testing data, find the problem timely notify the maintenance staff to check, do not wait for the computer to report errors, then report to the maintenance staff to repair.

Seven each calibration check must use one short, medium and long length / strength verification cotton, and two consecutive calibration tests can not use the same cotton sample, and ensure that each cotton sample is used at random.

3. color / impurity module test

one or two samples should be uniform in thickness and not less than 5cm in length, and the sample should be covered with the whole test window, so that xenon lamp can not be plucent when irradiated. The color / impurity pressure is pressed evenly on the cotton sample.

Two do not touch the color and impurities on the front side of the porcelain plate when calibrating and calibrating. Keep the test window, color and impurity porcelain face clean, and do not show light.

Three when calibrating the test, the calibration plate should be rotated for 90 degrees at each test, and then the next test will be carried out, with a total of 4 tests.

8 to strengthen maintenance so that HVI is always in good condition /p >

The maintenance of HVI is of great importance to the test results.

The maintenance staff and operators should cooperate closely to maintain the HVI maintenance work and ensure the test results.

The operator should do well in each class maintenance and timely reflect the HVI operation condition to the repairman.

Maintenance personnel should take the initiative to do routine maintenance work, regular inspection and maintenance of HVI, do not wait for HVI failure and then check and repair.

After each class inspection work, operators should clean and maintain in time.

clean scales, computer monitors and keyboards to ensure balance and computer integrity;

two clean vacuum box, ensure that the vacuum box net and filter net are clean and nondestructive; three clean the cooling fan filter net of the computer, power box and vacuum motor, ensure the HVI heat dissipation is good; four clean the color / impurity test window with wet cotton cloth, ensure that the test window is clean, no scratches and sundries; five clean and clean pallet rails, brush and clamping track to ensure smooth operation of the track; five clean the sampler and the cotton behind the press hand, ensure the sampling of the carding is normal; six check the dehydrator on the main air valve to ensure that there is no water accumulation in the gas path system.

maintenance personnel should carry out HVI cleaning and maintenance every day.

According to the use of HVI, do the following tasks in a timely manner: first, clean work.

Clean computer mainframe outside, including the rear wiring part of the main engine; cleaning length / intensity, and the control board, input and output board, analog board, intelligent motor, powerful motor and its initial position sensor; cleaning length / intensity and the masked air valve group, the exact control valve of the Morgan and the vacuum pipe.

The two is to check the lines and gas lines to ensure that all lines and gas roads are connected well.

The three is to check and adjust the air pressure of key components, to ensure that the total air pressure 6895Pa (i.e. 100psi), the pressure of the pinch mouth before and after the pull off device is about 300000 Pa (i.e. 3bar), the pressure of the exact control valve of the clone is 82740Pa to 103425Pa (12psi ~ 15psi), and the color heterozygosity pressure is not less than 45.3kg (i.e. 100 pounds).

The four is hardware check and adjustment.

Enter the length / intensity control board to check the analog voltage of the analog board, and adjust the optical zeros according to the need.

Five enter the control of the clone and length / strength control board, check whether the voltage is normal, carry out long and strong distribution test, motor current test and so on, and carry out maintenance and debugging when necessary.

Six check whether the combing pin is intact, whether the opening of the cylinder is normal, whether the opening position of the comb is correct or not, and to replace the comb or needle bed when necessary.

Adjust the opening position of the comb.

Seven check the Mack door opening and closing the tightness, carry out the test of the clone air flow, check whether the plug of the plug on the piston extension cap is blocked by cotton, and whether the seal ring of the masked cavity is worn and worn, so as to ensure the correctness of the Mack test.

Eight check the movement of color / impurity pressure pallets, pallets and stop rods to ensure the color test results.

Nine clean the porcelain tiles according to the maintenance requirements.

Ten calibrate the elongation, lens to break point, airflow calibration, cotton calibration and so on.

Ensure HVI runs normally and test results are accurate.