Neutron activation detection station device

Abstract

The utility model discloses a neutron activation detection station device for rapidly detecting the element content of a material. The device can be used for rapidly detecting the element content of solid bulk materials in industrial production processes of building materials, coal, metallurgy, mines and the like. The system is composed of an element analyzer, a mechanical arm, a weighing scale, a coding sample barrel, a coding card reader, an electric roller conveyor and a PLC control system. The measurement time of a single sample is 30-300 seconds, the weight of the single sample is 1-10 kg, and a plurality of samples can be continuously and automatically measured. The neutron activation detection device expands the application process points of the neutron activation technology, breaks through the traditional material detection mode, and has the advantages of wide application range, convenience in operation, high measurement precision, effective improvement of the detection efficiency and the like.

Description

Technical Field

[0001] The utility model relates to a neutron activation detection station device for rapidly and automatically detecting the element content of solid bulk materials in the industrial production process. Background Art

[0002] The traditional method for measuring the element content of industrial materials is that specialized sampling personnel collect samples of materials at each process link, crush, reduce, and grind the collected material samples into analysis samples required for measurement, and then conduct chemical analysis through fluorescence analysis or manual chemical analysis in a laboratory. Finally, the element content of the materials is obtained for production guidance and production assessment. The entire process takes several hours. The traditional chemical analysis method has high labor intensity, time lag, and low efficiency of personnel, and cannot effectively guide on-site production.

[0003] The cross-belt element on-line analyzer based on the principle of prompt gamma neutron activation analysis (PGNAA) or pulsed fast thermal neutron activation analysis (PFTNA) has been on the market for more than 20 years. The cross-belt element on-line analyzers of several professional companies in China and the United States have been widely used in the fields of building materials, coal, metallurgy, and mines. The cross-belt element on-line analyzer is a device for analyzing the element content of bulk materials based on belt installation, usually requiring a belt loading flow rate greater than 200 tons / hour, and the measurement conditions require sufficient and continuous material load on the running belt. However, the effect of element analysis on a small amount of materials is poor, and it is not suitable for the application of element content analysis of a small amount of materials.

[0004] The traditional on-line analyzer applying prompt gamma neutron activation analysis (PGNAA) or pulsed fast thermal neutron activation analysis (PFTNA) can only detect the elements of the materials at a single point on the belt to meet the quality control requirements of a certain process point. By applying the neutron activation detection station system, various material detection requirements can be realized, saving users' investment.

[0005] The detection technologies based on other technical principles can only measure the surface of materials, with poor representativeness, and are greatly affected by dust, steam, particle size, surface flatness of materials, etc.

[0006] Taking cement production as an example, the element content of each process link is a strictly controlled technical index, and it is necessary to take samples, prepare samples, and conduct chemical analysis on various materials such as limestone mine borehole rock powder, limestone, coal, slag, gypsum, clay, sandstone, shale, coal gangue, fly ash, raw meal, clinker, and finished cement. The neutron activation detection station system can realize the detection of all the above materials.

[0007] Rapid detection and quality control of element content in the industrial production processes of building materials, coal, metallurgy, and mines are of great significance. At present, there is no rapid element content detection device that can adapt to multiple process points and does not require sample pretreatment. Summary of the Invention

[0008] In view of the technological characteristics of solid bulk materials, quality control requirements, and defects of existing detection means in the industrial production process, the utility model provides a neutron activation detection station device with a wide application range, convenient and simple operation, high measurement accuracy, and remarkable quality control effect.

[0009] The technical solution adopted to solve the above technical problems is: combining the on-site solid bulk material production process, a neutron activation detection station device is used for element detection and quality control.

[0010] The device consists of an element analyzer (5), a robotic arm (8), a weighing scale (7), a coded sample bucket (11), a coded card reader (6), a feeding electric roller conveyor (9), a waste material electric roller conveyor (10), and a PLC control system (1).

[0011] Detection process:

[0012] a: Start the program of the PLC control system (1) to control the operation of the feeding electric roller conveyor (9) and the waste material electric roller conveyor (10);

[0013] b: Place all the coded sample buckets (11) filled with materials to be tested on the feeding electric roller conveyor (9);

[0014] c: When the first coded sample bucket (11) is transported to the position to be tested at the head of the feeding electric roller conveyor (9), the feeding electric roller conveyor (9) automatically stops running;

[0015] d; The robotic arm (8) automatically grabs the coded sample bucket (11)) and places it on the bench weighing scale (7) for weighing;

[0016] e: The robotic arm (8) grabs the weighed coded sample bucket (11) and places it into the sample station (3) of the loading / unloading position (4) of the analyzer (5) to complete loading;

[0017] f: The coded card reader (6) at the sample station of the loading / unloading position (4) reads the code of the coded sample bucket (11);

[0018] g: The turntable of the analyzer (5) starts and rotates 180 degrees to transfer the sample station (3) to the detection position (2) of the analyzer;

[0019] h; The analyzer (5) automatically starts measuring and completes the measurement after measuring for a preset time;

[0020] i: The turntable of the analyzer (5) turns the sample bucket (11) out of the detection position (2) and rotates 180 degrees to reach the loading / unloading position (4);

[0021] j: The robotic arm (8) picks up the coded sample bucket (11) at the loading / unloading position (4) and places it on the waste electric roller conveyor (10) to complete the unloading.

[0022] k: Repeat steps d to j until all the coded sample buckets (11) have been measured.

[0023] The elemental analyzer (5) uses neutron activation analysis technology. The analyzer detects one or more materials in the production process and has an elemental knowledge spectrum library and calibration model parameters for different types of materials. The elemental analyzer (5) adopts a rotary structure and is rotated by a motor controlling the middle axis of the turntable. The turntable has two sample positions (3) distributed at 180 degrees. When one position is at the detection position (2), the other position is at the loading / unloading position (4) simultaneously, improving the detection efficiency. The measurement time for a single sample is 30 seconds to 300 seconds, and the weight of a single sample is 1 kg to 10 kg. The sample does not need to be crushed or ground, and the sample is directly measured after being loaded into the coded sample bucket (11). A sample coding card is installed at the bottom of the coded sample bucket (11), and the coding card reader (6) is located at the bottom of the loading / unloading position (4) of the analyzer. When the coded sample bucket (11) is placed in the loading / unloading position (4), the card is read, and the system records the sample code. The entire system is controlled by the PLC control system (1), and multiple samples are continuously and automatically measured without manual intervention.

[0024] The system has an automatic correction function for measurement data affected by the sample weight. The coded sample bucket is weighed by a weighing scale, and the measurement model corrects the measured element data according to the sample weight information to eliminate the measurement error caused by different weight changes. The content data of each element measured by the analyzer increases with the increase of the sample weight and is highly linearly positively correlated with the sample weight. A mathematical model is established to correct the relationship between the elemental detection value of the analyzer and the change of the sample weight, a weight correction factor is added, and the multiple linear regression is used to adaptively adjust its measurement model to obtain the accurate percentage of each element content.

[0025] Y1 = (K1 * Y + K2 * L + K3 / L 2 + B) / L

[0026] Y1 is the detected value after weight correction; Y is the initial detected value; L is the collected sample weight; K1, K2, K3 are fitting parameters, and B is the fitting constant term.

[0027] The described neutron activation detection station system is based on Prompt Gamma Neutron Activation Analysis (PGNAA) or Pulsed Fast Thermal Neutron Activation (PFTNA) technology. The neutron excitation source and the detector are located inside the measuring device, and a transmission measurement method is adopted. The neutron excitation source is an isotope neutron source or a neutron generator, and the elemental analyzer uses a large-volume detector or a detector array. Inside the device, there are different neutron moderation, reflection materials and specifications for different types of neutron excitation sources, which are used to improve the utilization efficiency of different types of neutron sources and ensure the maximization of the neutron activation reaction efficiency in the measurement area. Through the structural layout design of the neutron excitation source, detector and sample workstations, the two sample workstations have the same measurement effect and consistent detection capabilities after reaching the detection position. In the system, the elemental analyzer, robotic arm, feeding electric roller conveyor and waste electric roller conveyor are all automatically controlled by the PLC system to realize the automatic operation of the whole system. The system can be optionally equipped with a moisture detection unit for material moisture detection and correction of elemental detection data. The system is equipped with a quality control program, which conducts data interaction with the on-site quality system and production control system to participate in quality control. The main detected elements include Cu, Fe, S, Ni, Si, Al, Ca, Mg, K, Na, Cl, Ti, Mn, Ag, Au, Cd, Co, Cr, Hg, P, V, Zn, N, Mo, As, Pb, etc.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows: it expands the application process points of neutron activation analysis technology, makes up for the deficiencies of the prior art, improves the detection efficiency, replaces the traditional chemical analysis method, saves investment costs, and can automatically and continuously detect multiple quantities and various types of material samples through the neutron activation detection station system. It realizes the functions of elemental detection and quality control, and stabilizes the product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic diagram of the composition of the neutron activation detection station device provided by an embodiment of the present utility model;

[0030] Figure 1 In the figure: 1. PLC control system, 2. Detection position, 3. Sample workstation, 4. Loading / unloading position, 5. Analyzer, 6. Coding card reader, 7. Desktop weighing scale, 8. Robotic arm, 9. Feeding electric roller conveyor, 10. Waste electric roller conveyor, 11. Coding sample bucket. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] As Figure 1 shown, an embodiment of the present utility model provides a neutron activation detection station device, which comprises: a PLC control system (1), a detection position (2), a sample station (3), a loading / unloading position (4), an analyzer (5), a coding card reader (6), a bench weighing scale (7), a robotic arm (8), a feeding electric roller conveyor (9), a waste material electric roller conveyor (10), and a coded sample bucket (11).

[0033] The detection process of the neutron activation detection station system in this example is as follows:

[0034] a: Start the program of the PLC control system (1) to control the operation of the feeding electric roller conveyor (9) and the waste material electric roller conveyor (10);

[0035] b: Place all the coded sample buckets (11) filled with materials to be tested on the feeding electric roller conveyor (9);

[0036] c: When the first coded sample bucket (11) is transported to the position to be tested at the head of the feeding electric roller conveyor (9), the feeding electric roller conveyor (9) automatically stops running;

[0037] d; The robotic arm (8) automatically grabs the coded sample bucket (11)) and places it on the bench weighing scale (7) for weighing;

[0038] e: The robotic arm (8) grabs the weighed coded sample bucket (11) and places it in the loading / unloading position (4) of the analyzer (5) turntable, sample station (3), to complete loading;

[0039] f: The coding card reader (6) at the sample station of the loading / unloading position (4) reads the code of the coded sample bucket (11);

[0040] g: The turntable of the analyzer (5) starts and rotates 180 degrees to transfer the sample station (3) to the analyzer detection position (2);

[0041] h; The analyzer (5) automatically starts measuring and completes the measurement after measuring for a preset time;

[0042] i: The turntable of the analyzer (5) turns the sample bucket (11) out of the detection position (2) and rotates 180 degrees to reach the loading / unloading position (4);

[0043] j: The robotic arm (8) grabs the coded sample bucket (11) at the loading / unloading position (4) and places it on the waste material electric roller conveyor (10) to complete unloading;

[0044] k: Repeat steps d to j until all the coded sample buckets (11) are measured;

[0045] In the embodiment, the elemental analyzer (5) adopts neutron activation analysis technology. The analyzer detects one or more materials in the production process and has an elemental knowledge spectrum library and calibration model parameters for different types of materials. The elemental analyzer (5) adopts a rotary structure. The motor controls the rotation of the middle axis of the turntable. The turntable has two sample stations (3), which are distributed at 180 degrees. When one station is at the detection position (2), the other station is at the loading / unloading position (4) at the same time, improving the detection efficiency. The measurement time for a single sample is 30 seconds to 300 seconds, and the weight of a single sample is 1 kg to 10 kg. The sample does not need to be crushed or ground. The sample is directly measured after being loaded into the coded sample bucket (11). A sample coding card is installed at the bottom of the coded sample bucket (11). The coding card reader (6) is located at the bottom of the loading / unloading position (4) of the analyzer. When the coded sample bucket (11) is placed in the loading / unloading position (4), the card is read and recorded. The entire system is controlled by the PLC control system (1), and multiple samples are continuously and automatically measured.

[0046] The system has an automatic correction function for measurement data affected by the sample weight. The coded sample bucket is weighed by a bench scale (7). The measurement model corrects the measured elemental data according to the sample weight information, mathematically models and corrects the relationship between the elemental detection value of the analyzer and the change in the sample weight, adds a weight correction factor, and adaptively adjusts its measurement model using multiple linear regression to obtain the accurate percentage of each element content.

[0047] Y1 = (K1 * Y + K2 * L + K3 / L 2 + B) / L

[0048] Y1 is the detected value after weight correction; Y is the initial detected value; L is the weight of the collected sample; K1, K2, and K3 are fitting parameters, and B is the fitting constant term.

[0049] In the neutron activation detection station system of the embodiment, based on the prompt gamma neutron activation analysis (PGNAA) technology, the neutron excitation source and the detector are located inside the measuring device, and the transmission measurement method is adopted. The neutron excitation source is an isotope neutron source, and the elemental analyzer (5) uses two large-volume detectors. The neutron moderation, reflection materials and specifications are designed inside the device to improve the utilization efficiency of the neutron source and ensure the maximization of the neutron activation reaction efficiency in the measurement area. Through the structural layout design of the neutron excitation source, detector and sample workstations, the two sample workstations (3) have the same measurement effect and consistent detection capabilities after rotating to the detection position (2). In the system, the elemental analyzer (5), the robotic arm (8), the feeding electric roller conveyor (9), and the waste electric roller conveyor (10) are all automatically controlled by the PLC control system (1) to realize the automatic operation of the entire system. The detection station system is equipped with a quality control program, which conducts data interaction and transmission with the on-site quality system and the production control system to participate in quality control. The main detected elements include Cu, Fe, S, Ni, Si, Al, Ca, Mg, K, Na, Cl, Ti, Mn, Ag, Au, Cd, Co, Cr, Hg, P, V, Zn, N, Mo, As, Pb, etc.

Claims

1. A neutron activation detection station device, characterized in that: The device is composed of an element analyzer (5), a mechanical arm (8), a weighing scale (7), a coded sample barrel (11), a coded card reader (6), a feed electric roller conveyor (9), a discard electric roller conveyor (10) and a PLC control system (1).

2. The neutron activation detection station device according to claim 1, characterized in that The element analyzer (5) adopts a rotary structure, and the middle shaft of the turntable is rotated by a motor. The turntable has two sample stations (3) distributed at 180 degrees. When one station is located at the detection station (2), the other station is simultaneously located at the loading / unloading station (4).

3. The neutron activation detection station device according to claim 1 is characterized in that A sample coding card is installed at the bottom of the coded sample barrel (11), and the coding card reader (6) is located at the bottom of the loading / unloading position (4) of the analyzer. When the coded sample barrel (11) is placed in the loading / unloading position (4), the card is read.

4. The neutron activation detection station device according to claim 1, characterized in that The element analyzer (5), the mechanical arm (8), the feed electric roller conveyor (9), and the discard electric roller conveyor (10) are controlled by a PLC control system (1), and multiple samples are measured continuously and automatically.

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