CN115436210A - Method for calibrating overall performance of accelerated polishing machine - Google Patents

Abstract

The invention discloses a method for calibrating the whole performance of an accelerated polishing machine, which comprises the following steps: selecting 2 standard samples which are not subjected to a polishing test and are measured, respectively installing the standard samples at 1 and 8 positions of a road wheel, enabling one side of each standard sample with a mark to face outwards, and installing test pieces or simulation test pieces at other positions; installing a rubber wheel marked as C on an adjusting arm, and loading No. 30 brown corundum into a sand storage hopper; adjusting various parameters of the accelerated polishing machine to meet the requirements; when the revolution reaches n1 revolutions, the accelerated polishing machine is automatically stopped, the road wheel and the test piece are cleaned, and all residual brown corundum is removed; unloading the C-marked rubber wheel, replacing the C-marked rubber wheel with the X-marked rubber wheel, and loading No. 280 green silicon carbide into a sand storage hopper; when the revolution reaches n2 revolutions, the accelerated polishing machine is automatically stopped, the standard sample is taken out, the road wheel and the test piece are cleaned, and all residual green silicon carbide is removed; the polishing values of 2 standard samples after polishing by the accelerated polishing machine were measured, respectively.

Description

A method for calibrating the performance of an accelerated polishing machine

technical field

The invention relates to the technical field of accelerated polishing machines, in particular to a method for calibrating the performance of the whole accelerated polishing machine.

Background technique

According to relevant statistics from the National Bureau of Statistics, by the end of 2020, the total mileage of my country's highways has reached 5.1981 million kilometers, of which 161,000 kilometers are expressways, ranking first in the world. In addition, according to relevant statistical data, traffic accidents in my country have occurred on average more than 200,000 times per year in the past five years, causing a large number of personnel and property losses. The reason is that the driver's own irregular driving behavior is a big aspect. At the same time, with the continuous increase of the service life, the continuous decline in the anti-skid performance of the road surface is one of the important factors.

The anti-skid performance of pavement is mainly determined by two aspects. Among them, the gradation determines the macroscopic structure of the road, and the roughness of the aggregate surface determines the microscopic structure of the pavement. In order to test the micro-roughness of the pavement surface and measure whether an aggregate meets the requirements of the anti-skid wear layer of asphalt pavement, the polishing value test is a representative detection method recognized at home and abroad. The accelerated polishing machine is one of the main instruments in the polishing value test.

At present, the performance verification of the whole machine of the accelerated grinder is mainly carried out in accordance with the relevant specifications of the JJG (Transportation) 054-2009 "Verification Regulations for Accelerated Polishing Machines", but there are certain limitations in the implementation of the actual verification:

(1) It is not easy to obtain certified standard test pieces;

(2) The materials used in the certified standard test pieces from different sampling yards have certain differences in various properties, which will affect the final verification results to a certain extent;

(3) The verification process is cumbersome, the cycle is long, and the verification success rate is not high.

Contents of the invention

For this reason, the present invention provides a method for calibrating the overall performance of an accelerated grinder to solve the above-mentioned problems in the prior art.

In order to achieve the above object, the present invention provides the following technical solutions:

According to the first aspect of the present invention, a method for calibrating the performance of an accelerated polishing machine includes the following steps:

Step S100, select 2 standard samples that have not been subjected to the polishing test and have been measured, and install the standard samples at positions 1 and 8 of the road wheel respectively, with the side of the standard sample with the mark facing outward, and install test pieces or Simulation test piece;

Step S200, install the rubber wheel marked C on the adjustment arm, and put No. 30 brown corundum into the sand storage bucket;

Step S300, adjusting various parameters of the accelerated grinder to meet the requirements;

Step S400, set the number of revolutions on the control panel as n1 revolutions, press the power switch to start and accelerate the grinder to start running;

Step S500, when the number of revolutions reaches n1 revolutions, the accelerated grinder automatically stops, and the road wheel and the test piece are cleaned to remove all residual brown fused alumina;

Step S600, remove the C-marked rubber wheel, replace it with an X-marked rubber wheel, and put No. 280 green silicon carbide into the sand storage bucket;

Step S700, set the number of revolutions on the control panel as n2 revolutions, press the power switch to start and accelerate the grinder to start running;

Step S800, when the number of revolutions reaches n2 revolutions, the accelerated grinder automatically stops, the standard sample is taken out, the road wheel and the test piece are cleaned, and all residual green silicon carbide is removed;

Step S900 , respectively measure the polishing values of the two standard samples polished by the accelerated polishing machine.

Further, before step S100, the method further includes: controlling the room temperature to 20°C±2°C 2 hours before and during the test.

Further, n1=3200 in step S400 and step S500.

Further, step S400 also includes starting the coarse sand speed control button and the water flow meter at the same time.

Further, n2=6400 in step S700 and step S800.

Further, step S700 also includes starting the fine sand speed control button and the water flow meter at the same time.

Further, the formula for calculating the difference before and after polishing of the standard sample in step S900 is:

Δ = PSV _0i - PSV _1i ;

In the formula:

Δ is the difference between the polished value of the standard sample before and after the polished value;

PSV _1i is the polishing value of the standard sample after polishing;

PSV _0i is the polishing value before the standard sample polishing value.

Further, test the polishing value of the standard sample after polishing, and compare it with the PSV value before polishing, so as to eliminate the polishing caused by the wear of the rubber sheet of the high-precision pendulum friction coefficient measuring device during the same test The introduction of measurement uncertainty.

Furthermore, the difference between the PSV of the standard sample before and after the polishing test should be 7 to 13, which means that the performance of the accelerated polishing machine is qualified.

The invention has the following advantages: compared with the original verification method, the raw materials of the new standard test piece used in the improved method are easier to obtain, effectively solving the bottleneck problem of the current standard substance production. In addition, the compressive performance of the new standard test piece is better than that of the original standard test piece, which can reduce the breakage of the test piece during the test. Based on the new standard test piece, using the improved verification method can reduce the verification process that originally took a day or even a few days to a few hours, and can also greatly improve the success rate of the verification. In the original verification method, the method of using the measurement results of PSV to directly judge the performance verification results of the accelerated polishing machine is improved, and the difference between the PSV of the standard test piece before and after the polishing test is used for judgment, thereby eliminating the friction caused by the pendulum friction. The influence of the uncertainty introduced by the measurement process of the coefficient determiner.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that are required in the description of the embodiments or the prior art. Apparently, the drawings in the following description are only exemplary, and those skilled in the art can also obtain other implementation drawings according to the provided drawings without creative work.

The structures, proportions, sizes, etc. shown in this manual are only used to cooperate with the content disclosed in the manual, so that people familiar with this technology can understand and read, and are not used to limit the conditions for the implementation of the present invention, so there is no technical In the substantive meaning above, any modification of structure, change of proportional relationship or adjustment of size shall still fall within the scope of the technical content disclosed in the present invention without affecting the functions and objectives of the present invention. within the range that can be covered.

Fig. 1 is a flow chart of a method for calibrating the overall performance of an accelerated grinder provided by some embodiments of the present invention.

detailed description

The implementation mode of the present invention is illustrated by specific specific examples below, and those who are familiar with this technology can easily understand other advantages and effects of the present invention from the contents disclosed in this description. Obviously, the described embodiments are a part of the present invention. , but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Accelerated Grinder Verification:

A. Control the room temperature at 20°C±2°C 2 hours before the test and during the test;

B. Select 2 standard samples that have not been tested for polishing and have been measured. Install the standard samples at positions 1 and 8 of the road wheel respectively. The side of the standard sample with the mark faces outward, that is, the running direction of the rubber wheel on the grinder is consistent with the running direction of the slippery block in the standard sample. Install the test piece at other positions or mock test piece;

C. Install the rubber wheel marked C on the adjustment arm, and put No. 30 brown corundum into the sand storage bucket;

D. Adjust the parameters of the accelerated grinder to meet the requirements;

E. Set the number of rotations on the control panel to 3200 rpm, press the power switch to start the accelerated grinder to start running, and start the coarse sand speed control button and water flow meter at the same time;

F. When the number of revolutions reaches 3200 revolutions, the accelerated grinder stops automatically, and the road wheels and test pieces are cleaned to remove all residual brown corundum;

G. Remove the C-marked rubber wheel, replace it with an X-marked rubber wheel, and put No. 280 green silicon carbide into the sand storage bucket;

H. Set the number of revolutions on the control panel to 6400 revolutions, press the power switch to start the accelerated grinder to start running, and start the fine sand speed control button and water flow meter at the same time;

I. When the number of revolutions reaches 6400 revolutions, the accelerated polishing machine stops automatically, takes out the standard sample, cleans the road wheel and the test piece, and removes all residual green silicon carbide;

J. Measure the polishing values of the two standard samples polished by the accelerated polishing machine respectively, and calculate the difference before and after polishing of the standard samples according to the following formula.

Δ = PSV _0i - PSV _1i ;

In the formula:

Δ is the difference between the polished value of the standard sample before and after the polished value;

PSV _1i is the polishing value of the standard sample after polishing;

PSV _0i is the polishing value before the standard sample polishing value.

Through the improved new method of accelerated grinder verification, use the new standard sample, use coarse sand to polish 3200 revolutions and fine sand to polish 6400 revolutions successively, and the verification of the accelerated grinder can be completed. Test the polishing value of the standard sample after polishing, and compare it with the PSV value before polishing, so as to eliminate the inaccurate measurement of the polishing value caused by the wear of the rubber sheet of the high-precision pendulum friction coefficient measuring device during the same test. The introduction of certainty. The difference between the PSV of the standard sample before and after the polishing test should be 7 to 13, and it can be determined that the performance of the accelerated polishing machine is qualified.

Traceability of the polishing quality value of the accelerated grinder: the polished value of the test piece is measured by a high-precision pendulum friction coefficient measuring device. Therefore, the accuracy of the performance verification of the accelerated grinder is evaluated by a high-precision pendulum friction coefficient measuring device .

According to the national measurement standards, the standards of angle, length and quality involved in the verification process of the accelerated grinder are shown in Table 1.

Table 1 Angle, length, quality national measurement standards.

The uncertainty evaluation of the measurement results of the polishing value of the standard sample in the performance verification process of the accelerated polishing machine is as follows:

U=1.2, k=2.

The maximum allowable error of the PSV difference between the pre-polished and post-polished PSV values of the accelerated polisher for the measurement of the qualification evaluation standard sample is 10±3. From this, it can be judged that the test result of the improved method of the performance test of the accelerated grinder is accurate and credible.

Advantages of the improved method of accelerated grinder verification: Compared with the original verification method, the advantages of the improved method of accelerated grinder performance verification are shown in Table 2.

Table 2 Comparison results of accelerated grinder verification methods.

Compared with the original verification method, the raw materials of the new standard sample used in the improved method are easier to obtain, effectively solving the bottleneck problem of the current standard substance production. In addition, the compressive performance of the new standard sample is better than that of the original standard sample, which can reduce the breakage of the test piece during the test. Based on the new standard sample, using the improved test method can reduce the test process that originally took a day or even a few days to a few hours, and can also greatly improve the success rate of the test. In the original verification method, the method of using the measurement results of PSV to directly judge the performance verification results of the accelerated polishing machine is improved, and the difference between the PSV of the standard sample before and after the polishing test is used for judgment, thereby eliminating the problem caused by the pendulum friction coefficient. The influence of uncertainty introduced by the measurement process of the determination device.

In order to verify the effectiveness and feasibility of the improved method for the performance verification of the accelerated grinder proposed in this paper, six certified standard samples and new standards stipulated in JJG (Transportation) 054-2009 "Verification Regulations for Accelerated Polisher" were used respectively. For the sample, according to the corresponding verification process, the performance verification of the three accelerated grinders was carried out respectively, and the verification results are as follows.

The test environment room temperature is 22°C, humidity is 85%RH, select three accelerated polishing machines 1#, 2#, and 3# to be verified and a pendulum friction coefficient measuring device within the maximum allowable error. Before the polishing test, the standard samples made of epidote andesite specified in JJG (Traffication) 054-2009 and the standard samples proposed in this paper, which are mainly composed of alumina ceramics 75% to 85%, sand (SiO2) 15% to 25% and adhesives etc. to measure the polishing value PSV of the new standard sample, and the average value of the measurement results is shown in Table 3.

Table 3 The average results of the PSV measurement of the specimen polishing value before the polishing test.

First, use the standard sample made of epidote petrochemical andesite to verify the accelerated grinder according to the JJG (Traffic) 054-2009 accelerated grinder verification regulations, and conduct two parallel tests. After the test, use the pendulum friction coefficient to measure The device measures the PSV of the specimen, and the measurement results are shown in Table 4.

Table 4 Results of PSV measurement of polishing value of standard sample of epidote petrochemical andesite.

It can be seen from Table 4 that according to the relevant provisions of JJG (Transportation) 054-2009 "Verification Regulations for Accelerated Polishing Machines", the PSV measurement results of the standard samples of the three accelerated polishing machines all meet the specified 46-52, Therefore, it can be determined that the accuracy of the three accelerated grinders is qualified.

Table 5 The results of the PSV measurement of the polished value of the new standard sample by the improved method.

Afterwards, using the improved method proposed in this paper, the three accelerated grinders were verified according to the accuracy verification steps of the whole machine. Using the new standard samples made, they were polished with coarse sand at 3200 turns and then with fine sand at 6400 turns. Two parallel experiments were performed, and the PSV value of the new standard sample was measured after the experiment. The results are shown in Table 5. It can be seen that, according to the process described in the improved method for the verification of accelerated grinders proposed in this paper, the measured PSV values of the new standard samples of the three accelerated grinders range from 61 to 64.

According to the average PSV of the polished value of the specimen in the parallel test in Table 4 and Table 5, the calculation results of the difference with the PSV of the specimen before polishing are shown in Table 6.

Table 6 compares the results of the PSV difference between the polished value of the test piece before and after the test.

It can be seen from the results in Table 6 that in accordance with the relevant regulations of JJG (Transportation) 054-2009, during the multiple tests using epidote petrified andesite, although the uncertainty brought about by the measurement of the pendulum friction coefficient measurement device was introduced, However, the PSV difference range of the specimens before and after multiple polishing tests is still in the range of 26-29. Therefore, in order to eliminate the impact of the uncertainty introduced by the use of verification equipment on the verification results during the verification process of the accelerated grinder, the improved method of this application judges the speed of the accelerated grinder through the PSV difference of the standard sample before and after the polishing test. Whether the overall performance of the optical machine is qualified. According to the results shown in Table 6, the PSV difference range of the new standard sample used in the improved method before and after the polishing test is 7 to 13, which is in line with the verification standard for the accuracy of the accelerated polishing machine proposed in the regulations, so it can be determined The accuracy of the three accelerated grinders is qualified.

Although the present invention has been described in detail with general descriptions and specific examples above, it is obvious to those skilled in the art that some modifications or improvements can be made on the basis of the present invention. Therefore, the modifications or improvements made on the basis of not departing from the spirit of the present invention all belong to the protection scope of the present invention.

Terms such as "upper", "lower", "left", "right", and "middle" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the present invention. The change or adjustment of the relative relationship shall also be regarded as the implementable scope of the present invention without substantive change of the technical content.

Claims (9)

1. A method for calibrating the performance of an accelerated polishing machine, comprising the following steps: Step S100, select 2 standard samples that have not been subjected to the polishing test and have been measured, and install the standard samples at positions 1 and 8 of the road wheel respectively, with the side of the standard sample with the mark facing outward, and install test pieces or Simulation test piece; Step S200, install the rubber wheel marked C on the adjustment arm, and put No. 30 brown corundum into the sand storage bucket; Step S300, adjusting various parameters of the accelerated grinder to meet the requirements; Step S400, set the number of revolutions on the control panel as n1 revolutions, press the power switch to start and accelerate the grinder to start running; Step S500, when the number of revolutions reaches n1 revolutions, the accelerated grinder automatically stops, and the road wheel and the test piece are cleaned to remove all residual brown fused alumina; Step S600, remove the C-marked rubber wheel, replace it with an X-marked rubber wheel, and put No. 280 green silicon carbide into the sand storage bucket; Step S700, set the number of revolutions on the control panel as n2 revolutions, press the power switch to start and accelerate the grinder to start running; Step S800, when the number of revolutions reaches n2 revolutions, the accelerated grinder automatically stops, the standard sample is taken out, the road wheel and the test piece are cleaned, and all residual green silicon carbide is removed; Step S900 , respectively measure the polishing values of the two standard samples polished by the accelerated polishing machine. 2. A method for calibrating the overall performance of an accelerated grinder according to claim 1, characterized in that before step S100, it further comprises: controlling the room temperature to 20°C±2°C 2 hours before and during the verification. 3. A method for calibrating the performance of the whole accelerated grinder according to claim 1, characterized in that n1=3200 in step S400 and step S500. 4. The method for calibrating the overall performance of an accelerated grinder according to claim 3, characterized in that step S400 further comprises simultaneously starting the coarse sand speed control button and the water flow meter. 5. A method for calibrating the performance of the whole accelerated grinding machine according to claim 4, characterized in that n2=6400 in step S700 and step S800. 6. The method for calibrating the overall performance of an accelerated grinder according to claim 5, characterized in that step S700 also includes starting the fine sand speed control button and the water flow meter at the same time. 7. A method for calibrating the performance of a complete accelerated polishing machine according to claim 1, wherein the formula for calculating the difference between the standard sample before and after polishing in step S900 is: Δ = PSV _0i - PSV _1i ; In the formula: Δ is the difference between the polished value of the standard sample before and after the polished value; PSV _1i is the polishing value of the standard sample after polishing; PSV _0i is the polishing value before the standard sample polishing value. 8. A method for calibrating the performance of a complete accelerated polishing machine according to claim 7, wherein the polishing value of the standard sample after testing is compared with the PSV value before polishing to eliminate In the same test process, the measurement uncertainty of the polishing value is introduced due to the wear of the rubber sheet of the high-precision pendulum friction coefficient measuring device. 9. A method for calibrating the performance of an accelerated polishing machine according to claim 8, characterized in that the difference between the PSV of the standard sample before and after the polishing test should be 7 to 13, and the accelerated polishing machine can be identified The performance of the whole machine has passed the inspection.

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