Random sampling method for powdery raw materials transported by tank truck

Abstract

The invention relates to a random sampling method for powdery raw materials transported by a tank truck, which comprises the following steps: S1, a driver swipes a card, and a system automatically acquires vehicle and cargo information; s2, the unloading duration S is determined; s3, determining sampling times n; s4, the raw and auxiliary material remote sampling system randomly generates sampling parameters of the vehicle: a sampling interval lower limit C, a sampling delay interval A and a sampling interval array [B1, B2,..., Bn-1]; s5, unloading is started, and after the sampling delay time interval A, the sampling machine starts sampling for the first time; after the first-time sampling is completed, the sampling machine starts second-time sampling after a sampling interval B1; and the rest can be done in the same manner until the sampling interval is Bn-1, and then the nth sampling is completed. Through the method, the randomness of the sampling interval is ensured, more comprehensive cargo quality data can be obtained, and the selective sampling risk is avoided. Meanwhile, a sampling delay parameter is introduced, so that the pollution of residues in an unloading pipeline to the sample is avoided, the irregularity of first sampling is ensured, and the representativeness of the sample is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of powdered raw material sampling, and in particular to a random sampling method for powdered raw materials transported by tank trucks. Background Art

[0002] Large steel companies now implement automated sampling for powdered raw materials delivered by tank trucks. Sampling intervals are generally set in accordance with GB2007.1, "General Rules for Sampling and Preparation of Bulk Ores." Because the sampling intervals specified in this standard are fixed, dishonest suppliers can easily manipulate the sampling pattern, mixing high- and low-quality raw materials and then using "selective sampling" to pass off inferior products as high-quality ones, thus compromising the authenticity and accuracy of sampling results. Summary of the Invention

[0003] In order to solve the problem that the automatic sampling interval in the prior art is a fixed constant and there is a risk of "selective sampling", the present invention provides a random sampling method for powdered raw materials transported by tank trucks, comprising the following steps:

[0004] S1. The driver swipes the card and the system automatically obtains vehicle and cargo information;

[0005] S2. Determine the unloading time S based on the cargo weight and unloading speed;

[0006] S3. Determine the sampling frequency n based on the recommended volume V of the sample collection barrel and the number of single samples q;

[0007] S4. The sampling parameters of the vehicle are randomly generated by the remote sampling system for raw and auxiliary materials, including: sampling interval lower limit C, sampling delay interval A and sampling interval array [B1, B2, ... B n-1 ];

[0008] S5. When unloading begins, after the sampling delay interval A, the sampler starts the first sampling; after the first sampling is completed, after the sampling interval B1, the sampler starts the second sampling; after the second sampling is completed, after the sampling interval B2, the sampler starts the third sampling; and so on, until the sampling interval B n-1 After time, the nth sampling is completed;

[0009] S6. Sampling is completed.

[0010] The cargo information in step S1 includes the type of powdered raw materials and the weight of the raw materials.

[0011] The unloading speed in step S2 is obtained by monitoring and summarizing over a period of time; the unloading time S = cargo weight / unloading speed.

[0012] The sample collection bucket in step S3 is used to store the samples taken out by the sampler each time; the recommended volume of the sample collection bucket is V = V max*0.75, where V max is the maximum volume of the sample collection barrel; the number of sampling times n = V / q, and the result is rounded up.

[0013] In step S4, the sampling interval lower limit C is generated by a random function from the interval [0.5*S / (n-1), S / (n-1)];

[0014] In step S4, the sampling delay interval A is generated by a random function from the interval [C, S / (n-1)];

[0015] The first n-2 sampling intervals in step S4 [B1, B2, ..., B n-2 ] is a random function generated from the interval [C, (SA) / (n-1)]; in step S4, the n-1th sampling interval B n-1 =SA-(S1+S2+…+S n-2 ).

[0016] Compared with the prior art, this invention has the following beneficial effects:

[0017] The randomization of sampling intervals ensures the randomness of sampling intervals, helping to obtain more comprehensive cargo quality data, avoiding the risk of selective sampling, and ensuring the reliability and effectiveness of sample extraction. The introduction of a sampling delay parameter also prevents contamination of samples by residues in the unloading pipeline, while ensuring that the initial sampling is irregular and representative. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a flow chart of a random sampling method for powdered raw materials transported by a tank truck. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0020] It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. Terms such as "upper," "lower," "front," "back," "top," and "bottom" indicate positions or locations based on those shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or parts referred to must have a specific orientation, be constructed, or operate in a specific orientation, and are therefore not to be construed as limitations on the present invention. It should be understood that the terms used in this manner are interchangeable where appropriate for the purposes of describing the embodiments of the present invention herein. Furthermore, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0021] like Figure 1 As shown, a random sampling method for powdered raw materials transported by tank trucks of the present invention comprises the following steps:

[0022] S1. The driver swipes the card and the system automatically obtains vehicle and cargo information.

[0023] Cargo information includes the type of powdered raw materials and the weight of the raw materials.

[0024] S2. Determine the unloading time S based on the cargo weight and unloading speed.

[0025] The unloading speed in step S2 is obtained by monitoring and summarizing over a period of time; the unloading time S = cargo weight / unloading speed.

[0026] S3. Determine the number of sampling times n based on the recommended volume V of the sample collection bucket and the number of single samples q.

[0027] The sample collection bucket is used to store the samples taken out by the sampler each time. In order to prevent the samples from overflowing the sample collection bucket, the recommended volume of the sample collection bucket is V = V max *0.75, where V max The maximum volume of the sample collection bucket. The number of sampling times n = V / q, the result is rounded up.

[0028] S4. The sampling parameters of the vehicle are randomly generated by the remote sampling system for raw and auxiliary materials, including: sampling interval lower limit C, sampling delay interval A and sampling interval array [B1, B2, ... B n-1 ].

[0029] To prevent the phenomenon of too short a sampling interval, resulting in a too long interval between two samples and a too short interval between the last sample, a parameter called the lower limit of the sampling interval C is set to ensure the representativeness of the samples. The lower limit of the sampling interval C is generated by a random function from the interval [0.5*S / (n-1), S / (n-1)].

[0030] Because samples may be contaminated by residues in the unloading pipeline at the beginning of unloading, the sampling delay interval A is set. The sampling delay interval A is the time between the start of unloading and the start of sampling by the sampler. The sampling delay interval A is generated by a random function from the interval [C, S / (n-1)];

[0031] The first n-2 sampling intervals [B1, B2, ..., B n-2 ] is a random function generated from the interval [C, (SA) / (n-1)]; in step S4, the n-1th sampling interval B n-1 =SA-(S1+S2+…+S n-2 ).

[0032] S5. When unloading begins, after the sampling delay interval A, the sampler starts the first sampling; after the first sampling is completed, after the sampling interval B1, the sampler starts the second sampling; after the second sampling is completed, after the sampling interval B2, the sampler starts the third sampling; and so on, until the sampling interval B n-1 After time, the nth sampling is completed.

[0033] S6. Sampling is completed.

[0034] Example 1

[0035] The driver swipes the card and the system automatically obtains vehicle and cargo information: 30 tons of lime powder.

[0036] According to previously monitored unloading data, the unloading time S for this weight of lime powder is 400 seconds.

[0037] The maximum volume V of the sample collection barrel used in this sampling max =4.5 liters, recommended volume of sample collection barrel V = 4.5*0.75 = 3.375 liters, single sampling quantity q = 1 liter, number of samplings n = 3.375 / 1 = 3.375 times, and the number of samplings after rounding up is n = 4 times.

[0038] The sampling parameters of the vehicle are randomly generated using the remote sampling system for raw and auxiliary materials:

[0039] The lower limit of the sampling interval C is generated from the interval [0.5*400 / 3, 400 / 3] using a random function, C = 73 seconds;

[0040] The sampling delay interval A is generated from the interval [73, 400 / 3] using a random function, A = 86 seconds;

[0041] The first two sampling intervals [B1, B2] are generated from the interval [73, (400-86) / 3] using a random function, resulting in the first two sampling intervals being 89 seconds and 103 seconds respectively; the third sampling interval B3 = 400-86-(89+103) = 122 seconds.

[0042] After sampling starts, the sampler starts the first sampling after the unloading delay interval of 86 seconds; after the first sampling is completed, the sampler starts the second sampling after B1 = 89 seconds; after the second sampling is completed, the sampler starts the third sampling after B2 = 103 seconds; after the third sampling is completed, the sampler starts the fourth sampling after B3 = 122 seconds.

[0043] Sampling is complete.

[0044] Example 2

[0045] The driver swipes the card and the system automatically obtains vehicle and cargo information: 50 tons of bentonite.

[0046] According to previously monitored unloading data, the unloading time S for this weight of bentonite is 1500 seconds.

[0047] The maximum volume V of the sample collection barrel used in this sampling max The recommended volume of the sample collection bucket is 6 liters, V = 6*0.75 = 4.5 liters, the single sampling quantity q is 1 liter, the number of sampling times n = 4.5 / 1 = 4.5 times, and the number of sampling times after rounding up is n = 5 times.

[0048] The sampling parameters of the vehicle are randomly generated using the remote sampling system for raw and auxiliary materials:

[0049] The lower limit of the sampling interval C is generated from the interval [0.5*1500 / 4, 1500 / 4] using a random function, C = 198 seconds;

[0050] The sampling delay interval A is generated from the interval [198, 1500 / 4] using a random function, A = 236 seconds;

[0051] The first three sampling intervals [B1, B2, B3] are generated using a random function from the interval [198, (1500-236) / 4], resulting in the first three sampling intervals being 294 seconds, 308 seconds, and 199 seconds, respectively; the fourth sampling interval B3 = 1500-236-(294+308+199) = 463 seconds.

[0052] After sampling starts, the sampler starts the first sampling after a unloading delay interval of 236 seconds; after the first sampling is completed, the sampler starts the second sampling after B1 = 294 seconds; after the second sampling is completed, the sampler starts the third sampling after B2 = 308 seconds; after the third sampling is completed, the sampler starts the fourth sampling after B3 = 199 seconds; after the fourth sampling is completed, the sampler starts the fifth sampling after B4 = 463 seconds.

[0053] Sampling is complete.

[0054] The above is only one embodiment of the present invention and is not intended to limit the scope of the present invention. It should be noted that a person skilled in the art can make several improvements and modifications without departing from the technical principles of the present invention, and such improvements and modifications should all be included in the scope of protection of the present invention.

Claims

1. A random sampling method for powdered raw materials transported by tank trucks, characterized in that: The following steps are involved: S1. The driver swipes the card, and the system automatically obtains vehicle and cargo information; S2. Determine the unloading time S based on the cargo weight and unloading speed; S3. Determine the sampling number n according to the recommended volume V of the sample collection bucket and the number of single samples q; S4. The sampling parameters of the vehicle are randomly generated through the remote sampling system for raw and auxiliary materials, including: sampling interval lower limit C, sampling delay interval A and sampling interval array [B1, B2, ... B n-1 ]; S5. When unloading starts, after sampling delay interval A, the sampler starts the first sampling; after the first sampling is completed, after sampling interval B1, the sampler starts the second sampling; after the second sampling is completed, after sampling interval B2, the sampler starts the third sampling; and so on, until sampling interval B n-1 After time, the nth sampling is completed; S6. Sampling ends.

2. A random sampling method for powdered raw materials transported by tank trucks according to claim 1, characterized in that: The cargo information in step S1 includes the type of powdered raw materials and the weight of the raw materials.

3. The random sampling method for powdered raw materials transported by tank trucks according to claim 1, characterized in that: The unloading speed in step S2 is obtained by monitoring and summarizing over a period of time; unloading time S = cargo weight / unloading speed.

4. The random sampling method for powdered raw materials transported by tank trucks according to claim 1, characterized in that: The sample collection bucket in step S3 is used to store the samples taken out by the sampler each time; the recommended volume of the sample collection bucket is V = V max *0.75, where V max is the maximum volume of the sample collection barrel; the number of sampling times n = V / q, and the result is rounded up.

5. The random sampling method for powdered raw materials transported by tank trucks according to claim 1, characterized in that: In step S4, the sampling interval lower limit C is generated by a random function from the interval [0.5*S / (n-1), S / (n-1)].

6. The random sampling method for powdered raw materials transported by tank trucks according to claim 1, characterized in that: In step S4, the sampling delay interval A is generated by a random function from the interval [C, S / (n-1)].

7. The random sampling method for powdered raw materials transported by tank trucks according to claim 1, characterized in that: The sampling intervals [B1, B2, ..., B n-2 ] is a random function generated from the interval [C, (SA) / (n-1)]; in step S4, the n-1th sampling interval B n-1 =SA-(S1+S2+…+S n-2 ).

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