Accurate ingredient weighing method of single-stage vibration reduction scale in full-automatic material strength detection

Abstract

The invention relates to a single-stage vibration reduction scale accurate batching and weighing method in full-automatic material strength detection. The method comprises the steps of sampling, batching, compensating, testing and the like. According to the accurate batching and weighing method of the single-stage vibration reduction scale in full-automatic material strength detection provided by the invention, multiple weighing, allowance presetting and parallel weighing modes of the first-stage vibration reduction scale are adopted, so that the problem of relatively large weighing deviation of a non-weighing test material entering the rotary drum and the vibration reduction scale can be solved, and meanwhile, the weighing accuracy can be improved; therefore, the precision and accuracy of strength detection are improved.

Description

Technical Field

[0001] The invention relates to an accurate batching and weighing method of a single-stage vibration reduction scale in full-automatic material strength detection, and belongs to the technical field of material strength detection. Background Art

[0002] With the rapid development of automated testing technology, the strength testing of materials such as coke, iron ore, and sintered ore has been gradually transformed from the original manual sampling, manual screening, manual weighing and batching, manual drum screening, manual weighing, and manual calculation methods to automatic sampling, automatic screening, automatic batching, automatic drum testing, automatic screening, automatic weighing, and automatic calculation methods. At present, whether it is the DI strength of coke or the strength test of iron ore (sintered ore), the test sample is first divided into 4 parts through 3 particle size screens, and the theoretical mass of the batching is calculated according to the mass ratio of the sample composed of the three particle size screens. Then, the samples of each particle size are batched manually or mechanically according to the theoretical mass of the batching to form the drum test sample (15kg for iron ore and 10kg for coke). At present, most domestic steel and coking enterprises use fully automatic methods to test the strength of such materials. Therefore, accurate batching of each particle size test sample and accurate weighing are one of the most important links in the fully automatic drum test, and are also one of the reasons for the abnormal drum strength data. At present, there are basically two modes of fully automatic drum testing in China: robotic and non-robotic. (i) Robotic: The sample is sampled at the head of the belt at the material transfer station, and is transferred by the belt to a separate testing area with a better environment. The robot then transfers the sample to various functional equipment to complete particle size detection, batching, drum testing, sample preparation, etc. This model has a large investment and a good working environment. (ii) Non-robotic: The current mainstream model in China (accounting for more than 80%) has a small investment and a poor working environment. It utilizes the height difference of the existing belt transport transfer station to arrange functional equipment such as sampling equipment, screening equipment, batching equipment, drum testing, screening equipment, sample preparation equipment and discarding equipment in layers. The systems are automated through the control system, and there is no robot in the entire process. Some systems use a first-level vibration reduction weighing method for drum batching, that is, the particle size weighing and batching are completed with only one scale, and the batching is carried out by vibration batching and reduction weighing. That is, each particle size sample is weighed twice before and after batching, and the difference in mass before and after batching is taken as the final mass of the particle size sample entering the drum. However, there are also very few automatic detection systems that use a two-level weighing method (two scales). In actual drum tests, although the total mass of most samples entering the drum can meet the test requirements well, it is often the case that the total mass of the samples after drumming is greater than the total mass of the samples entering the drum after batching (negative loss), which ultimately manifests as a large drum strength, resulting in large fluctuations in drum test data or abnormal data.The reason for the above phenomenon is that the batching hopper is a common vibration reduction scale. During actual batching, part of the test material is concentrated on the edge of the hopper after one batching. Once vibration occurs on site or other bucket scales vibrate, the test material at the edge of the open hopper will fall into the transport belt, the feed belt, and finally into the drum. However, in the existing weighing mode, the particle size test material has been weighed and transmitted to the computer system at the end of batching. Therefore, these test materials that fall into the belt due to on-site vibration will not be included in the total mass of the test material, resulting in the total mass of the drum test material exceeding the mass of the drum test material, generally 0.1-0.3kg, and individual extreme values ​​can reach 0.5-0.6kg. When calculating the drum strength, the mass recorded in the computer system is still used, and the drum index detection data is biased. In addition, since the system is installed in a poor on-site environment and works in a vibrating environment, its quality data fluctuates, generally fluctuating between -0.03-0.05kg. On-site weighing uses one weighing and one reading, so there will be certain deviations in the weighing process, which will have a certain impact on the accuracy of the ingredients. Summary of the invention

[0003] The technical problem to be solved by the present invention is: to overcome the disadvantages of the above-mentioned technology and to provide an accurate batching weighing method in the batching link of an automatic drum strength detection system.

[0004] In order to solve the above technical problems, the technical solution proposed by the present invention is: a method for accurately weighing ingredients using a single-stage vibration reduction scale in a fully automatic material strength test, comprising the following steps:

[0005] (1) Sample screening and sampling: the sample is screened, classified according to the particle size, divided into several particle sizes and collected on the vibrating weight loss scale of each particle size;

[0006] According to the mass of each particle size sample and the standard of the test to be performed, the mass percentage of each particle size sample to be tested is calculated, and then the theoretical batch mass M of each particle size sample to be tested is calculated. i理论 ; According to the formula: M i设定 =M i理论 -M i平均质量 ; Calculate the set batching mass of each particle size to be tested; where M i平均质量 It is the average particle mass of the sample of each particle size to be tested; i ranges from 1 to n-1, indicating the classification from large to small particle size, 1 indicates the largest particle size to be tested, and n indicates the smallest particle size to be tested;

[0007] According to the formula: Calculate the set batch mass of the sample with the minimum particle size required for testing;

[0008] (2) Batching: Batching is performed according to the set batching mass of the samples of each particle size to be tested. Batching is performed in the order of particle size from large to small, starting with the sample of the largest particle size. The vibrator of the vibration reduction scale is started, and the sample is placed on the feeding belt, and then the feeding belt enters the drum. During the discharge process, the vibration reduction scale weighs the remaining sample, and the actual discharge amount is calculated by difference subtraction, and compared with the set batching mass of the particle size. When the set weight is reached, the material is stopped, and the actual batching mass of the sample of the particle size is calculated.

[0009] Replace the sample with the next particle size and repeat the process until all the samples of each particle size to be tested are batched.

[0010] (3) Compensation; re-weigh the mass of the samples of each particle size to be tested by a vibrating weight reduction scale. If the total mass of the samples of each particle size to be tested differs from the test standard by between -0.15% and 0.25%, no compensation is performed; if the total mass of the samples of each particle size to be tested differs from the test standard by less than -0.15%, use the sample of the smallest particle size to be tested for compensation until the total mass of the samples of each particle size to be tested differs from the test standard by between -0.15% and 0.25%; if the total mass of the samples of each particle size to be tested differs from the test standard by more than 0.25%, abandon the samples of this batching and return to step (2) for re-batch;

[0011] (4) Place in a rotating drum for testing.

[0012] A further improvement of the above scheme is that in step (2), when the actual discharge amount reaches M i设定 -AM i理论 When , the vibrator reduces the amplitude, where A takes a value of 0.05 to 0.2.

[0013] A further improvement of the above scheme is that in step (2), the sample is placed in front of the feeding belt, and the feeding belt is first reversed by 1 / 2 of the belt length.

[0014] A further improvement of the above scheme is that in the steps (1) and (3), when the vibrating weight reduction scale is used for weighing, repeated weighing is performed, a maximum mass and a minimum mass are eliminated, and then the weighing is averaged, and the average value is calculated as the mass of the sample of each particle size.

[0015] The single-stage vibration reduction scale accurate batching weighing method in the fully automatic material strength detection provided by the present invention adopts a first-stage vibration reduction scale for multiple weighing, preset margin and parallel weighing mode, which can solve the problem of large weighing deviation of non-weighed samples entering the drum and the vibration reduction scale, and at the same time improve the accuracy of weighing, thereby improving the precision and accuracy of strength detection. The present invention can continue to use the existing equipment system without adding new equipment, and only needs to modify the batching part of the control software. The automatic detection system using the method of the present invention has lower investment and is more competitive. The method of the present invention improves the precision and accuracy of strength detection, can reduce the number of tests (reduce the number of re-batching) and equipment loss, and at the same time, can also reduce equipment maintenance costs. The present invention is applicable to fully automatic drum strength detection of coke and iron ore and tests of other multi-grade batching materials. DETAILED DESCRIPTION

[0016] The single-stage vibration reduction weighing method for accurate batching in the fully automatic material strength detection of this embodiment, taking the coke DI drum test as an example, comprises the following steps:

[0017] (1) Sample screening and sampling: After the coke transported by the belt is collected by the coke automatic sampling and testing system, it is screened by a multi-stage drum and the test material is divided into multiple particle sizes: <25mm, 25-50mm, 50-75mm, >75mm; the samples are collected on a vibration reduction scale for each particle size; when the vibration reduction scale is used for weighing, the samples are weighed repeatedly, the maximum mass and the minimum mass are eliminated, and then the average is calculated as the mass of the sample of each particle size.

[0018] According to the actual mass of each particle size and the requirements of JIS k 2151:2004, the mass of coke of the three particle sizes of 25-50mm, 50-75mm, and >75mm is used to calculate the percentage of the three sample particle sizes of the batch, and the theoretical batch mass of coke of each particle size is calculated based on 10kg of the sample;

[0019] According to the formula: M i设定 =M i理论 -M i平均质量 ; Calculate the set batching mass of the samples of each particle size to be tested;

[0020] Where M i理论 is the theoretical batching mass of the sample of each particle size; M i平均质量 is the average particle mass of the sample of each particle size; i is 1 to 2, indicating the classification from large to small particle size, 1 indicates the largest particle size to be tested, that is, >75mm, 2 indicates the middle particle size to be tested, that is, 50-75mm;

[0021] According to the formula: Calculate the set batch mass of the sample with the smallest particle size to be tested, that is, 25-50mm;

[0022] (2) Batching: Before batching, the feeding belt is reversed by 1 / 2 of the belt length to remove individual cokes that fall into the feeding belt during screening; batching is performed according to the set batching mass of the samples of each particle size to be tested, and batching is performed in the order of particle size from large to small, starting with the sample of the largest particle size. The vibrator of the vibration reduction scale is started, and the sample is placed on the feeding belt, and then the feeding belt enters the drum; during the discharge process, the vibration reduction scale weighs the remaining sample, and the actual discharge amount is calculated by difference subtraction, and compared with the set batching mass of the particle size; until the adjusted set weight is reached, the material is stopped, and the actual batching mass of the sample of the particle size is calculated;

[0023] Replace the sample with the next particle size and repeat the process until all the samples of each particle size to be tested are batched.

[0024] During the discharge process, when the actual discharge amount reaches the set batching mass M n设定 -(0.05~0.2)*M i理论 kg, the amplitude of the vibrator of the vibration weighing scale decreases, and the material feeding slows down, so that more accurate batching can be carried out.

[0025] The coefficient of 0.05 to 0.2 can be selected according to the density, average particle size mass and actual number of batched particles of different test materials. If batching fails multiple times, a larger coefficient should be used. If the batching time is too long, a smaller coefficient should be used.

[0026] (3) Compensation: The mass of the samples of each particle size to be tested is re-weighed by a vibration weight loss scale. When the vibration weight loss scale is used for weighing, the weighing is repeated several times, and the maximum mass and the minimum mass are eliminated. The average is then taken as the mass of the samples of each particle size.

[0027] If the weight difference of the samples of each particle size to be tested is between -0.15% and 0.25% compared with the test standard (according to the coke DI standard sample of 10kg, that is, 9.85kg to 10.25kg), no compensation is performed; if the total weight difference of the samples of each particle size to be tested is less than -0.15% compared with the weight difference of the test standard, the sample of the smallest particle size to be tested is used for compensation until the total weight difference of the samples of each particle size to be tested is between -0.15% and 0.25% compared with the weight difference of the test standard; if the total weight difference of the samples of each particle size to be tested is greater than 0.25% compared with the test standard, the samples of this batching are abandoned and the process returns to step (2) to re-batch.

[0028] (4) After the prepared sample enters the drum, the system automatically performs drum detection and post-drum screening, and calculates the strength value of the batch of coke.

[0029] The single-stage vibration reduction weighing method for accurate batching in the fully automatic material strength test of this embodiment was verified 15 times after being cited, and the specific results are as follows:

[0030]

[0031] From the above table, it can be concluded that except for some ingredients that exceed the quality control range, the quality entering the drum is consistent with the actual quality of the ingredients discharged, and the rest of the ingredients meet the requirements.

[0032] The present invention is not limited to the above embodiments. Any technical solution formed by equivalent replacement falls within the protection scope required by the present invention.

Claims

1. A method for accurately weighing ingredients using a single-stage vibration reduction scale in a fully automatic material strength test, characterized in that: The steps include: (1) Sample screening and sampling: the sample is screened, classified according to the particle size, divided into several particle sizes and collected on the vibrating weight loss scale of each particle size; According to the mass of each particle size sample and the standard of the test to be conducted, calculate the mass percentage of each particle size sample to be tested, and calculate the theoretical batch mass of each particle size sample to be tested based on the total amount of standard test samples. ; Then according to the formula: = - ; Calculate the set batching mass of the test materials of each particle size to be tested; In the formula, It is the average particle mass of the sample of each particle size to be tested; i ranges from 1 to n-1, indicating the classification from large to small particle size, 1 indicates the largest particle size to be tested, and n indicates the smallest particle size to be tested; According to the formula: = - - ; Calculate the set batch mass of the sample with the minimum particle size required for testing; (2) Batching: Batching is carried out according to the set batching mass of the samples of each particle size to be tested. Batching is carried out in the order of particle size from large to small, starting with the sample of the largest particle size. The vibrator of the vibration reduction scale is started, and the sample is placed on the feeding belt, and then the feeding belt enters the drum. During the discharge process, the vibration reduction scale weighs the remaining sample, and the actual discharge amount is calculated by difference subtraction and compared with the set batching mass of the particle size. When the set batching mass is reached, the material is stopped, and the actual batching mass of the sample of the particle size is calculated. Replace the sample with the next particle size and repeat the process until all the samples of each particle size to be tested are batched. (3) Compensation: Re-weigh the mass of the samples of each particle size to be tested by a vibrating weight reduction scale. If the total mass of the samples of each particle size to be tested differs from the test standard by between -0.15% and 0.25%, no compensation is performed. If the total mass of the samples of each particle size to be tested differs from the test standard by less than -0.15%, use the sample of the smallest particle size to be tested for compensation until the total mass of the samples of each particle size to be tested differs from the test standard by between -0.15% and 0.25%. If the total mass of the samples of each particle size to be tested differs from the test standard by more than 0.25%, abandon the samples of this batching and return to step (2) for re-batch. (4) Place in the drum for testing.

2. The single-stage vibration reduction scale accurate batching weighing method in the fully automatic material strength detection according to claim 1 is characterized by: In step (2), when the actual discharge amount reaches -A When , the vibrator reduces the amplitude, where A takes a value of 0.05 to 0.

2.

3. The method for accurately weighing ingredients using a single-stage vibration reduction scale in a fully automatic material strength test according to claim 1 is characterized in that: In the step (2), the sample is placed in front of the feeding belt, and the feeding belt is first reversed by 1 / 2 of the belt length.

4. The method for accurately weighing ingredients using a single-stage vibration reduction scale in a fully automatic material strength test according to claim 1 is characterized in that: In the steps (1) and (3), when the vibrating weight loss scale is used for weighing, the weighing is repeated multiple times, a maximum mass and a minimum mass are eliminated, and then the weighing is averaged, and the average value is calculated as the mass of the sample of each particle size.

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