Quality evaluation method for outsourcing pig iron

Abstract

The invention discloses a quality evaluation method for outsourced pig iron, which comprises the following steps: sampling: dividing a sampling area according to the type of an incoming material vehicle, selecting a sample area in the sampling area in a lottery mode, and obtaining the incoming material quality condition in the sample area; the weight condition of common sundries is obtained in the sample area, weight deduction is carried out according to the actual weight of the common sundries, or weight deduction of supplied sundries is estimated through a sundries weight estimation method; and abnormity processing: during sampling in the test area, detecting the quality condition of the pig iron block material, and when the quality of the pig iron block material is abnormal, evaluating and recording the proportion condition of the abnormal pig iron block. By means of sampling area division and system lottery, personnel participation factors are reduced, the reactor bottom sampling process is increased, sampling representativeness is improved, traceability of the sampling inspection process is ensured, supply side source quality control is guided by means of impurity punishment, a basis can be provided when disputes are generated, and legitimate rights and interests of the supply side and the demand side are maintained.

Description

Technical Field

[0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a quality assessment method for purchased pig iron blocks. Background Art

[0002] Pig iron is a product of blast furnace smelting of iron ore. Depending on the form of carbon in the pig iron, it can be divided into steelmaking pig iron, casting pig iron, and ductile iron. With the improvement of steelmaking technology and the shortening of steelmaking cycles, steelmaking requires a large amount of purchased pig iron to increase production.

[0003] At present, the quality sampling method of purchased pig iron blocks is generally to randomly select a piece of pig iron from the surface of the pile as a quality inspection sample, which is not very representative. In addition, the assessment of ash is mostly done by visual inspection, and there is a lack of verification method, which easily leads to disputes between the supply and demand sides. Summary of the Invention

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a quality assessment method for purchased pig iron blocks to solve the problems raised by the above-mentioned background technology.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a quality assessment method for purchased pig iron blocks, comprising the following steps:

[0006] Sampling: Sampling areas are divided according to the types of incoming vehicles, and sample areas are selected within the sampling area by lottery to obtain the quality of incoming materials in the sample areas;

[0007] Debris assessment: Obtain the weight of general debris in the sample area and deduct the weight according to the actual weight of general debris, or use the debris weight estimation method to estimate the weight of incoming debris;

[0008] Abnormal handling: When sampling in the test area, the quality of the pig iron blocks is tested. When the quality of the pig iron blocks is abnormal, the proportion of abnormal pig iron blocks is evaluated and recorded.

[0009] As a further improvement of the present invention: before the sampling step, it also includes: unloading and weighing the incoming vehicle, sampling the unloaded material for quality inspection, checking the vehicle and material information, and detecting whether the vehicle water tank contains water, and deducting penalties based on the water content of the water tank.

[0010] As a further improvement of the present invention, the penalty processing according to the water tank water situation includes: checking whether the vehicle water tank has water, if the water tank has more than 20 kg of water, it is considered to have water in the water tank, and if the water tank has water, a penalty of 5 to 20 times the water tank water amount is imposed;

[0011] If the water tank exceeds 20 kg but does not exceed 100 kg, a penalty of five times the weight will be imposed;

[0012] If the water tank exceeds 100 kg but does not exceed 300 kg, a penalty of 10 times the weight will be applied;

[0013] If the water tank exceeds 300 kilograms, a penalty of 20 times the weight will be imposed.

[0014] As a further improvement of the present invention: said dividing the sampling area according to the type of incoming vehicle includes: said incoming vehicle types include dump trucks, flatbed trucks and trains;

[0015] After the dump truck unloads, the pile is divided into 4 equal parts in a cross pattern, and each part is divided into 3 layers: upper, middle and lower. The layers are divided into 12 sampling areas in a clockwise direction starting from the right.

[0016] According to the materials on the flatbed truck, the materials are divided into three sampling areas: front, middle and back;

[0017] The materials in the train car were divided into five sampling areas in a "Z" shape from the direction of the locomotive, including a sampling area in the center of the car and a sampling area at 1 / 4 of the distance from the corner of the car on each diagonal line.

[0018] As a further improvement of the present invention: the method of selecting a sample area within the sampling area by lottery includes:

[0019] For dump trucks, a number is generated through a lottery system, and a complete sample is taken from the numbered area as the surface sample of the dump truck. Then the material is lifted from the top of the pile, and another complete sample is taken from the bottom area as the inner layer sample of the dump truck;

[0020] The surface and inner samples of the sample area selected by lottery represent the quality of the pig iron blocks of the entire dump truck.

[0021] As a further improvement of the present invention, the method of selecting a sample area within the sampling area by lottery also includes:

[0022] For flatbed trucks, two sampling areas are generated through a lottery system. The first number drawn is the surface sampling area, and a complete sample is taken from the surface of the surface sampling area as the surface sample of the flatbed truck; the second number is the inner sampling area, and a complete sample is taken from the bottom of the inner sampling area as the inner sample of the flatbed truck. The surface sampling area and the inner sampling area of ​​the sample area selected by lottery represent the quality of the pig iron blocks of the entire flatbed truck.

[0023] As a further improvement of the present invention, the method of selecting a sample area within the sampling area by lottery also includes:

[0024] For train car materials, two sampling areas are generated through a lottery system. The first number drawn is the surface sampling area, and a complete sample is taken from the surface of the surface sampling area as the surface sample of the train car; the second number is the inner sampling area, and a complete sample is taken from the bottom of the inner sampling area as the inner sample of the train car. The surface sampling area and the inner sampling area of ​​the train car sample area selected by lottery represent the quality of the pig iron blocks in the train car.

[0025] As a further improvement of the present invention: the general sundries include straw mats, straw bales, tarpaulins, accumulated water in the vehicle and scattered ash. The general sundries are sundries naturally added or brought in during loading, and the weight of the general sundries is deducted according to the actual weight.

[0026] As a further improvement of the present invention: the method for estimating the weight of debris includes selecting an area of ​​one square meter in the sample area as an estimated area, and after unloading the vehicle, weighing the weight of the debris in the estimated area and multiplying it by the actual area of ​​the vehicle as the weight of the batch without debris.

[0027] As a further improvement of the present invention: the detection of the quality of the pig iron block material includes: checking whether the color, shape and size of the incoming pig iron block material are consistent, and when inconsistency occurs, evaluating and recording the proportion of abnormal pig iron blocks.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] In the present invention, the human participation factor is reduced and the bottom sampling process is increased by dividing the sampling areas and using a systematic lottery method. While improving the representativeness of the sampling, the traceability of the random inspection process is ensured. By deducting penalties for debris, the supplier's source quality control is guided, and there is a basis for reference when disputes arise, thereby safeguarding the legitimate rights and interests of both the supply and demand sides. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the present invention.

[0031] Figure 2 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0032] In order to enable a clear and complete understanding of the technical solution, the present invention is further described in conjunction with the embodiments and drawings. Obviously, the described embodiments are only some embodiments of the present invention, and all other embodiments obtained by technical personnel in the relevant field without making creative work are within the scope of protection of the present invention.

[0033] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0034] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the present invention. As used in the specification and appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0035] It should be further understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0036] An embodiment of the present invention provides a quality assessment method for purchased pig iron blocks, comprising the following steps: sampling: dividing a sampling area according to the type of incoming vehicle, selecting a sample area within the sampling area by lottery, and obtaining the quality of the incoming materials within the sample area; debris assessment: obtaining the weight of general debris within the sample area, deducting the weight according to the actual weight of the general debris, or estimating the weight of the incoming debris by a debris weight estimation method; abnormality handling: when sampling within the test area, detecting the quality of the pig iron block material, and when the quality of the pig iron block material is abnormal, evaluating and recording the proportion of abnormal pig iron blocks.

[0037] The quality of incoming materials obtained through the above steps at least includes the weight of the incoming vehicle and the weight of the unloaded materials. This weight information can be used as the basis for incoming material data. Combined with the regional division method of this application, it is designed for the structure and unloading characteristics of different transport vehicles, ensuring that materials can be more comprehensively covered in different scenarios, improving the comprehensiveness and representativeness of sampling. The system determines the selection of sampling areas by lottery, making the sampling process more random and fair, and easy to trace. The site is cleared before the vehicle unloads to reduce the interference of other factors, ensuring the traceability of the sampling process, and guiding the supplier's source quality control through penalties for debris. In the event of disputes, there is a basis to rely on, safeguarding the legitimate rights and interests of both supply and demand parties.

[0038] Furthermore, before the sampling step, it also includes: unloading and weighing the incoming vehicle, sampling the unloaded material for quality inspection, verifying the vehicle and material information, and detecting whether the vehicle's water tank contains water, and imposing penalties based on the water content of the water tank.

[0039] Vehicles entering the factory are strictly prohibited from carrying water in their tanks for weighing. This is primarily to ensure the accuracy of the quality inspection data for pig iron blocks. The weight of the pig iron blocks is an important basis for settlement. Carrying water in the vehicle's tank will increase the overall weight of the vehicle. If this is not restricted, suppliers may increase the "weight" of the pig iron blocks by carrying water in the tank, thereby obtaining improper benefits during transaction settlement, harming the economic interests of the consignee, and maintaining fairness and justice in transactions. Therefore, vehicles entering the factory are strictly prohibited from carrying water in the tank. After materials arrive at the unloading point, personnel from the receiving unit will notify the quality inspection team to collect samples. Upon arrival, the quality inspection team will first verify whether the license plate number and material name information are consistent, and then check whether the vehicle's tank is filled with water.

[0040] Furthermore, the penalty processing based on the water tank contains water includes: checking whether the vehicle water tank contains water, if the water tank contains more than 20 kg, it is considered as water tank containing water, and if the water tank contains water, a penalty of 5 to 20 times the water tank volume will be imposed;

[0041] If the water tank exceeds 20 kg but does not exceed 100 kg, a penalty of five times the weight will be imposed;

[0042] If the water tank exceeds 100 kg but does not exceed 300 kg, a penalty of 10 times the weight will be applied;

[0043] If the water tank exceeds 300 kilograms, a penalty of 20 times the weight will be imposed.

[0044] The adoption of a tiered penalty standard sets different penalty multiples according to different water volume ranges, which has a stronger management orientation. The differentiated punishment method can encourage the transporter to be more cautious in avoiding the problem of water in the water tank, improve the effectiveness of management, and better safeguard the legitimate rights and interests of both supply and demand parties.

[0045] Furthermore, the dividing of the sampling areas according to the types of incoming vehicles includes: the types of incoming vehicles include dump trucks, flatbed trucks and trains;

[0046] After the dump truck unloads, the pile is divided into 4 equal parts in a cross pattern, and each part is divided into 3 layers: upper, middle and lower. The layers are divided into 12 sampling areas in a clockwise direction starting from the right.

[0047] For dump trucks, a number is generated through a lottery system, and a complete sample is taken from the number area as the surface sample of the dump truck. The material is then hoisted from the top of the pile, and another complete sample is taken from the bottom area as the inner sample of the dump truck. The surface and inner samples of the sample area selected by lottery represent the quality of the pig iron blocks of the entire dump truck.

[0048] In this embodiment, the pile is divided crosswise into four equal parts, allowing for a preliminary division of the material from different directions, covering all lateral areas of the pile and avoiding sampling concentrated on one side or a local area. This is then divided into three layers, allowing for sampling at different depths, including the top, middle, and bottom of the pile, to account for possible differences between the surface and interior materials. Surface materials may differ from the interior materials in terms of oxidation level and surface attachments due to factors such as bumps and friction during transportation. Sampling in three layers allows for comprehensive collection of material samples at different depths. Finally, 12 sampling areas are divided clockwise, further refining the sampling range and more comprehensively reflecting the characteristics of the entire pile. After the 12 areas are divided, the sampling areas are selected by lottery, reducing the subjectivity of human selection. Each area has the same probability of being selected, making the sampled samples more random, thereby improving the representativeness of the sampling and better reflecting the overall quality of the pig iron blocks carried by the dump trucks.

[0049] According to the materials on the flatbed truck, the materials are divided into three sampling areas: front, middle and back;

[0050] For flatbed trucks, two sampling areas are generated through a lottery system. The first number drawn is the surface sampling area, and a complete sample is taken from the surface of the surface sampling area as the surface sample of the flatbed truck; the second number is the inner sampling area, and a complete sample is taken from the bottom of the inner sampling area as the inner sample of the flatbed truck. The surface sampling area and the inner sampling area of ​​the sample area selected by lottery represent the quality of the pig iron blocks of the entire flatbed truck.

[0051] In this embodiment, the flatbed truck divides the material into three sampling areas: front, middle, and rear. This is primarily to improve sampling representativeness and reduce operational complexity. When transporting pig iron on a flatbed truck, the material distribution within the truck may vary. The front and rear sections of the truck are affected by inertia and bumps during transportation, and the state of the pig iron may differ from that of the middle section. Dividing the material into three sampling areas: front, middle, and rear allows samples to be obtained from different locations, covering the characteristics of the material at different locations within the truck. This makes the samples more representative and more accurately reflects the quality of the pig iron throughout the truck.

[0052] The materials in the train carriage were divided into five sampling areas in a "Z" shape from the locomotive direction, including a sampling area in the center of the carriage and a sampling area at 1 / 4 of the distance from the corner of the carriage on both diagonals;

[0053] For train car materials, two sampling areas are generated through a lottery system. The first number drawn is the surface sampling area, and a complete sample is taken from the surface of the surface sampling area as the surface sample of the train car; the second number is the inner sampling area, and a complete sample is taken from the bottom of the inner sampling area as the inner sample of the train car. The surface sampling area and the inner sampling area of ​​the train car sample area selected by lottery represent the quality of the pig iron blocks in the train car.

[0054] In this example, when transporting pig iron, the train carriages are relatively long, and the characteristics of the material at different locations within the carriage may vary. By adopting a "Z"-shaped partitioning system, the sampling area can cover different horizontal and vertical locations in the carriage. In the areas near the front and rear of the train, the pig iron may be subjected to varying degrees of compression and friction due to inertia during transportation, and its surface condition and degree of oxidation may differ from those in the middle of the carriage. The material distribution at the sides and center of the carriage may also vary during loading. The five "Z"-shaped partitioning zones can account for the material conditions at these different locations, ensuring that the collected samples are more representative and more accurately reflect the quality of the pig iron in the entire carriage.

[0055] Furthermore, the general sundries include straw mats, straw bales, tarpaulins, accumulated water in the vehicle and scattered ash. The general sundries are sundries that are naturally added or brought in during loading, and the general sundries will be deducted according to their actual weight.

[0056] As a further improvement of the present invention: the method for estimating the weight of debris includes selecting an area of ​​one square meter in the sample area as an estimated area, and after unloading the vehicle, weighing the weight of the debris in the estimated area and multiplying it by the actual area of ​​the vehicle as the weight of the batch without debris.

[0057] The debris weight estimation method involves drawing lots to select a truckload of the same unit and material arriving that day. The weight of the debris is then measured in a one-square-meter area, and the weight is multiplied by the actual area of ​​the truckload to calculate the weight before debris. This method, through sampling and area conversion, more accurately determines the actual weight of the debris than simple estimates or irregular measurements. By measuring representative areas, the weight of the entire truckload can be reasonably estimated, bringing the weight before debris closer to the actual value and ensuring the accuracy of pig iron quality assessment and transaction settlement.

[0058] Furthermore, the detection of the quality of the pig iron block material includes: checking whether the color, shape and size of the incoming pig iron block material are consistent, and when inconsistency occurs, evaluating and recording the proportion of abnormal pig iron blocks.

[0059] Implementation Cases:

[0060] 1. Automobile sampling:

[0061] (1) Vehicles entering the factory: It is strictly forbidden for vehicles entering the factory to carry water in the water tank. After the materials arrive at the unloading point, the personnel of the receiving unit will notify the quality inspection to take samples. After the quality inspection personnel arrive at the scene, they will first check whether the license plate number and material name information are consistent, and check whether the vehicle water tank carries water. If the amount of water exceeds 20 kg, it will be identified as water in the water tank. If there is water in the water tank, a penalty of 5 to 20 times the amount of water will be imposed. If it exceeds 20 kg but does not exceed 100 kg, a penalty of 5 times will be imposed; if it exceeds 100 kg but does not exceed 300 kg, a penalty of 10 times will be imposed; if it exceeds 300 kg, a penalty of 20 times will be imposed.

[0062] (2) Sample inspection:

[0063] 1. After checking that there are no abnormalities in the relevant information, notify the receiving unit to arrange unloading operations;

[0064] 2. Sample extraction method:

[0065] (1) Dump truck:

[0066] After unloading, the pile is divided into 4 equal parts in a cross manner in the direction of unloading and with the top of the material pile as the center. Each equal part is then divided into 3 layers in the form of upper, middle and lower layers. The pile is then divided into 12 sampling areas (represented by Arabic numerals from 1 to 12) in a clockwise direction starting from the right. A number is then generated by lottery through the system, and a complete sample is taken from the numbered area as the surface sample of the vehicle.

[0067] After taking the samples, arrange the overhead crane to lift the material from the top of the pile until the bottom is seen, and then take another complete sample from the bottom area as the inner layer sample of the car.

[0068] Two samples, the surface sample and the inner layer sample, represent the quality of the entire vehicle.

[0069] (2) Flatbed truck (requires overhead crane for unloading):

[0070] Divide the materials on the vehicle into three sampling areas (represented by numbers 1-3) at the front, middle, and back;

[0071] The system draws lots to generate two sampling areas. The first number drawn is the surface sampling area, and a complete sample is taken from the surface of this area as the surface sample of the vehicle; the second number is the inner sampling area, and the overhead crane opens this area and takes a complete sample from the bottom. The two samples, the surface sample and the inner sample, represent the quality of the vehicle.

[0072] (3) Train:

[0073] The material in the carriage was divided into five sampling areas in a "Z" shape (i.e. the center and the two diagonal lines 1 / 4 of the distance from the corner of the carriage) from the locomotive direction;

[0074] Each car will be assigned two numbers. The first number will be used to take the surface sample, and the second number will be used to take the inner layer sample. The surface sample will be taken on the surface. When taking the inner layer sample, a bottom sampling "pit" must be moved and a complete sample will be taken from this area as the inner layer sample.

[0075] When deducting miscellaneous items, photos of each vehicle must be taken for record.

[0076] 3. Debris Assessment Method

[0077] (1) General sundries: mainly refers to sundries naturally added or brought into the vehicle during loading, such as straw mats, straw bales, tarpaulins, accumulated water in the vehicle, and scattered ash. Such items will be deducted according to their actual weight (a straw mat covering the bottom of the vehicle will be deducted at 30 kg / vehicle; a dry straw bale will be deducted at 5 kg; a wet straw bale will be deducted at 7 kg; a tarpaulin will be deducted at 70 kg / vehicle).

[0078] (2) Miscellaneous object weight estimation method: Under the premise that no other abnormal conditions are found, a vehicle with the same unit and the same materials entering the factory on the same day is selected by lottery. Then, an area of ​​one square meter is selected. After unloading the vehicle, the weight of the miscellaneous objects in the area is weighed and multiplied by the actual area of ​​the vehicle to obtain the weight of the miscellaneous objects for the batch (miscellaneous object weight = weight of one square meter of the vehicle × actual area of ​​the vehicle).

[0079] (3) Deduction of punitive debris: refers to piles of debris that appear among the pig iron blocks and are not naturally brought in during loading or are necessary for protection, such as accumulated ash and debris. Select the largest pile, weigh it by square meter, and multiply it by a coefficient of 2 to be the debris weight of the car. The deduction of debris weight = the weight of the largest pile of debris per square meter × the actual area of ​​the car × 2.

[0080] 4. Abnormal situations

[0081] When taking samples, it is necessary to check whether the color, shape and size of the materials are consistent. If inconsistencies occur, relevant units need to be organized to jointly evaluate the proportions. If necessary, they should be processed as AB samples, that is, 2 samples are taken according to two different situations, and the sample result with the largest deduction represents the quality of the entire vehicle.

[0082] In summary, after reading the present invention document, ordinary technicians in this field can make various other corresponding transformation schemes based on the technical solutions and technical concepts of the present invention without creative mental work, and all of them fall within the scope of protection of the present invention.

Claims

1. A method for evaluating the quality of purchased pig iron blocks, characterized in that: The following steps are involved: Sampling: Sampling areas are divided according to the types of incoming vehicles, and sample areas are selected within the sampling area by lottery to obtain the quality of incoming materials in the sample areas; Debris assessment: Obtain the weight of general debris in the sample area and deduct the weight according to the actual weight of general debris, or use the debris weight estimation method to estimate the weight of incoming debris; Abnormal handling: When sampling in the test area, the quality of the pig iron blocks is tested. When the quality of the pig iron blocks is abnormal, the proportion of abnormal pig iron blocks is evaluated and recorded.

2. The quality assessment method of purchased pig iron blocks according to claim 1, characterized in that: Before the sampling step, it also includes: unloading and weighing the incoming vehicle, sampling the unloaded material for quality inspection, verifying the vehicle and material information, and checking whether the vehicle's water tank contains water, and deducting penalties based on the water content of the water tank.

3. The quality assessment method of purchased pig iron blocks according to claim 2, characterized in that: The penalty treatment based on water in the water tank includes: checking whether the vehicle water tank has water, if the water in the water tank exceeds 20 kg, it is considered as water in the water tank, and if the water tank has water, a penalty of 5 to 20 times the water in the water tank will be imposed; If the water tank exceeds 20 kg but does not exceed 100 kg, a penalty of five times the weight will be imposed; If the water tank exceeds 100 kg but does not exceed 300 kg, a penalty of 10 times the weight will be applied; If the water tank exceeds 300 kilograms, a penalty of 20 times the weight will be imposed.

4. The quality assessment method of purchased pig iron blocks according to claim 1, characterized in that: The sampling area is divided according to the type of incoming vehicle, including: the incoming vehicle types include dump trucks, flatbed trucks and trains; After the dump truck unloads, the pile is divided into 4 equal parts in a cross pattern, and each part is divided into 3 layers: upper, middle and lower. The layers are divided into 12 sampling areas in a clockwise direction starting from the right. According to the materials on the flatbed truck, the materials are divided into three sampling areas: front, middle and back; The materials in the train carriage were divided into five sampling areas in a "Z" shape from the direction of the locomotive, including a sampling area in the center of the carriage and a sampling area at 1 / 4 of the distance from the corner of the carriage on each diagonal line.

5. The quality assessment method of purchased pig iron blocks according to claim 4, characterized in that: The method of selecting a sample area within the sampling area by lottery includes: For dump trucks, a number is generated through a lottery system, and a complete sample is taken from the numbered area as the surface sample of the dump truck. Then the material is lifted from the top of the pile, and another complete sample is taken from the bottom area as the inner layer sample of the dump truck; The surface and inner samples of the sample area selected by lottery represent the quality of the pig iron blocks of the entire dump truck.

6. The quality assessment method of purchased pig iron blocks according to claim 4, characterized in that: The selecting of the sample area within the sampling area by lottery also includes: For flatbed trucks, two sampling areas are generated through a lottery system. The first number drawn is the surface sampling area, and a complete sample is taken from the surface of the surface sampling area as the surface sample of the flatbed truck; the second number is the inner sampling area, and a complete sample is taken from the bottom of the inner sampling area as the inner sample of the flatbed truck. The surface sampling area and the inner sampling area of ​​the sample area selected by lottery represent the quality of the pig iron blocks of the entire flatbed truck.

7. The quality assessment method of purchased pig iron blocks according to claim 4, characterized in that: The selecting of the sample area within the sampling area by lottery also includes: For train car materials, two sampling areas are generated through a lottery system. The first number drawn is the surface sampling area, and a complete sample is taken from the surface of the surface sampling area as the surface sample of the train car; the second number is the inner sampling area, and a complete sample is taken from the bottom of the inner sampling area as the inner sample of the train car. The surface sampling area and the inner sampling area of ​​the train car sample area selected by lottery represent the quality of the pig iron blocks in the train car.

8. The quality assessment method of purchased pig iron blocks according to claim 1, characterized in that: The general sundries include straw mats, straw bales, tarpaulins, accumulated water in the vehicle and scattered ash. The general sundries are sundries that are naturally added or brought in during loading. The weight of the general sundries will be deducted according to the actual weight.

9. The quality assessment method of purchased pig iron blocks according to claim 8, characterized in that: The method for estimating the weight of debris includes selecting an area of ​​one square meter in the sample area as an estimated area, weighing the weight of the debris in the estimated area after unloading, and then multiplying the weight by the actual area of ​​the entire vehicle to obtain the weight of the batch without debris.

10. The quality assessment method of purchased pig iron blocks according to claim 1, characterized in that: The detection of the quality of the pig iron block material includes: checking whether the color, shape and size of the incoming pig iron block material are consistent, and when inconsistency occurs, evaluating and recording the proportion of abnormal pig iron blocks.

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