Radioactive Waste Feed Metering Device and Method for Nuclear Power Plant

Abstract

The present invention relates to a radioactive waste feeding metering device for a nuclear power plant, which comprises a crushing unit, a conveying unit and a weighing unit. The crushing unit has a crushing chamber; the conveying unit includes a first screw conveyor and a second screw conveyor. The first screw conveyor has a first conveying chamber communicated with the crushing chamber; the second screw conveyor has a second conveying chamber communicated with the first conveying chamber; the material conveying amount of the first screw conveyor per unit time is greater than that of the second screw conveyor per unit time; the weighing unit includes a first weighing sensor, a second weighing sensor and a third weighing sensor which are distributed in a triangular shape in the vertical projection. The first weighing sensor and the second weighing sensor are respectively connected with the crushing unit, and the third weighing sensor is connected with the conveying unit. The present application realizes the accurate metering and feeding of materials through the combination of two screw conveyors with different conveying rates and the weighing unit, and solves the problem that the materials cannot be accurately metered and fed in the traditional technology.

Description

Technical Field

[0001] The invention relates to the field of material processing, in particular to a radioactive waste feed metering device and method for a nuclear power plant. Background Art

[0002] With the development of nuclear power technology, radioactive nuclear waste treatment technology has emerged. In traditional technology, radioactive waste treatment equipment is often prone to material jamming during the crushing and transportation of materials, and the weight of the discharged materials cannot be accurately measured. Therefore, it is not suitable for the crushing and precise feeding of various radioactive wastes in different physical states. Summary of the invention

[0003] Based on this, it is necessary to provide a nuclear power plant radioactive waste feed metering device and method to address the problem that the radioactive waste treatment device cannot accurately measure the discharge weight of the material.

[0004] A radioactive waste feed metering device for a nuclear power plant comprises a crushing unit, a conveying unit and a weighing unit, wherein the crushing unit has a crushing chamber for crushing materials of a preset weight M1; the conveying unit comprises a first screw conveyor and a second screw conveyor, wherein the first screw conveyor has a first conveying chamber connected to the crushing chamber to receive the crushed materials in the crushing chamber; the second screw conveyor has a second conveying chamber connected to the first conveying chamber; and the material conveying amount of the first screw conveyor per unit time is greater than the material conveying amount of the second screw conveyor per unit time; the weighing unit comprises a first weighing sensor, a second weighing sensor and a third weighing sensor which are triangularly distributed in a vertical projection, wherein the first weighing sensor and the second weighing sensor are respectively connected to the crushing unit, and the third weighing sensor is connected to the conveying unit, so as to jointly weigh the radioactive waste feed metering device for a nuclear power plant.

[0005] In one embodiment, the first screw conveyor includes a first shell having a first conveying chamber, a first drive motor located outside the first conveying chamber, and a first screw rotatably provided in the first shell and located in the first conveying chamber. The first drive motor is respectively connected to the crusher and the end of the first screw extending out of the first conveying chamber. The transmission ratio of the first drive motor to the crusher is A, and the transmission ratio of the first drive motor to the first screw is B, wherein the ratio of A to B is a preset value.

[0006] In one embodiment, the second screw conveyor includes a second shell arranged parallel to the first shell and having a second conveying chamber, a second drive motor and a second screw rotatably arranged on the second shell, the second screw extends out of the second conveying chamber and is transmission-connected to the second drive motor, a connecting component is provided between the first shell and the second shell, and a connecting channel is formed on the connecting component, which is respectively connected to the first conveying chamber and the second conveying chamber.

[0007] In one embodiment, the connecting component includes a first flange connected to the first housing, a second flange connected to the second housing, and a connecting pipe connected between the first flange and the second flange. The connecting pipe defines a communication channel.

[0008] In one embodiment, the crushing unit includes a bin having a feed chamber, a crushing bin having a crushing chamber, a feed valve, and a crusher. A discharge communication port communicating with both the feed chamber and the crushing chamber is provided at the bottom end of the bin. A feed valve is provided at the discharge communication port to control the on-off between the feed chamber and the crushing chamber. The crushing component of the crusher penetrates through the crushing bin and extends into the crushing chamber to crush the material in the crushing chamber.

[0009] In one embodiment, the bin and the crushing bin are integrally formed.

[0010] In one embodiment, a high-level switch and a low-level switch are arranged at intervals along a first direction on the side wall of the bin. The high-level switch is configured to trigger a high-level alarm signal when the material in the bin is greater than the maximum preset amount, and the low-level switch is configured to trigger a low-level alarm signal when the material in the bin is less than the minimum preset amount.

[0011] In one embodiment, a vibration module is provided on the side wall of the bin, and the vibration module is located between the high-level switch and the low-level switch.

[0012] In one embodiment, the weighing module includes two first support parts and a second support part. The two first support parts are supported below the first weighing module and are symmetrically distributed with respect to the crushing unit as the object, and the second support part is supported below the second weighing module.

[0013] The present application also provides a method for measuring the feed of radioactive waste in a nuclear power plant, including the following steps: putting materials with a preset weight M1 into the crushing unit; crushing the materials in the crushing unit and conveying the materials in the crushing unit by the first screw conveyor of the conveying unit; obtaining the total weight of the feed metering device in real time. When the total weight of the feed metering device reaches the first preset weight M2, stop the crusher and the first screw conveyor of the crushing unit; start the second screw conveyor of the conveying unit; obtain the total weight of the feed metering device in real time. When the total weight of the feed metering device reaches the second preset weight M3, stop the metered feed.

[0014] In one embodiment, the crushing unit includes a bin with a feed chamber, a crushing bin with a crushing chamber, and a feed valve provided at the connection between the bin and the crushing bin and used to control the on-off of the feed chamber and the crushing chamber. Feeding materials with a preset weight M1 into the crushing unit specifically includes: controlling the feed valve to close; feeding materials into the feed chamber of the bin until the total weight of the feed metering device reaches M0 + M1 and then stopping feeding, where M0 is the net weight of the feed metering device when no materials are fed; controlling the feed valve to open and crushing the materials entering the crushing chamber.

[0015] In one embodiment, if the high-level switch on the bin is triggered during feeding, the material replenishment is stopped; if the low-level switch on the bin is triggered during crushing, the metered feeding ends.

[0016] In one embodiment, the opening time of the feed valve is T1, the starting time of crushing the materials in the crushing unit is T1 + ΔT1, where ΔT1 is the first preset time period; the time to stop crushing the materials in the crushing unit is T2, and the opening time of the second screw conveyor is T2 + ΔT2, where ΔT2 is the second preset time period.

[0017] In the technical solution of this application, the radioactive waste feeding metering device of a nuclear power plant includes a crushing unit, a conveying unit, and a weighing unit. The crushing unit has a crushing chamber for crushing materials with a preset weight M1. The conveying unit includes a first screw conveyor and a second screw conveyor. The first screw conveyor has a first conveying chamber connected to the crushing chamber to receive the crushed materials in the crushing chamber. The second screw conveyor has a second conveying chamber connected to the first conveying chamber. And the material conveying amount of the first screw conveyor per unit time is greater than that of the second screw conveyor per unit time. The weighing unit includes a first weighing sensor, a second weighing sensor, and a third weighing sensor that are distributed in a triangular shape in the vertical projection. The first weighing sensor and the second weighing sensor are respectively connected to the crushing unit, and the third weighing sensor is connected to the conveying unit to jointly weigh the radioactive waste feeding metering device of the nuclear power plant. That is to say, the weighing unit uses a three-point support method to jointly bear the entire feeding metering device, making the spatial layout of the device stable while also meeting the requirements of accurate metering. The metering feeding process of the materials is divided into preliminary metering feeding and accurate metering feeding. The preliminary metering feeding amount is controlled by the weighing unit and the first screw conveyor. First, as the crushing and conveying processes proceed, the total weight of the feeding metering device obtained by the weighing unit gradually decreases. Among them, the total weight of the feeding metering device refers to the sum of the net weight M0 of the feeding metering device and the material weight M1. When the actual discharge amount is close to the target discharge amount, the crusher and the first screw conveyor are stopped, and the material is conveyed by the second screw conveyor with a smaller conveying amount, and the weighing unit performs accurate metering feeding. A part of the materials remaining on the first conveying chamber is conveyed to the outside of the device through the second conveying chamber of the second screw conveyor. During this process, the total weight of the feeding metering device obtained by the weighing unit further decreases. When the actual total discharge amount reaches the target total discharge amount, the second screw conveyor is stopped. That is to say, this application realizes the accurate metering feeding of materials through two screw conveyors with different conveying rates combined with the corresponding weighing unit, and solves the problem that the feeding weight of materials cannot be accurately measured in the traditional technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the overall structure diagram of the feeding metering device according to an embodiment of this application;

[0019] Figure 2 is the structure diagram of the conveying unit of the feeding metering device according to an embodiment of this application;

[0020] Figure 3 is the side view of the feeding metering device according to an embodiment of this application;

[0021] Figure 4 is the flowchart of the metering feeding method according to an embodiment of this application.

[0022] Reference numerals:

[0023] Crushing unit 1;

[0024] Crushing bin 11; storage bin 12; crusher 13; vibration module 14;

[0025] Crushing chamber A1; feeding chamber A2; outflow connecting hole A3;

[0026] Conveying unit 2;

[0027] First screw conveyor 21; first drive motor 211; first housing 212; first screw 213;

[0028] Second screw conveyor 22; second drive motor 221; second housing 222; second screw 223;

[0029] Connecting component 23; first flange 231; second flange 232; connecting pipe 233;

[0030] Reducer 24;

[0031] First conveying chamber B1; second conveying chamber B2; connecting channel B3;

[0032] Weighing unit 3;

[0033] First weighing sensor 31; second weighing sensor 32; third weighing sensor 33;

[0034] High level switch 34; low level switch 35.

[0035] Controller 4;

[0036] Net weight M0 of the feeding metering device; preset material weight M1; weight M2 of the material in the conveying unit;

[0037] Opening time T1 of the feeding valve; first preset time period ΔT1;

[0038] Time T2 to stop the crusher; second preset time period ΔT2. Detailed implementation manners

[0039] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following will describe the detailed implementation manners of the present invention with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0040] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0041] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0042] In the present invention, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0044] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation.

[0045] Please refer to Figure 1 , Figure 1 which shows a schematic diagram of the overall structure of the feed metering device in an embodiment of the present invention.

[0046] An embodiment of the present invention provides a nuclear power plant radioactive waste feed metering device, which includes a crushing unit 1, a conveying unit 2 and a weighing unit 3. The crushing unit 1 has a crushing chamber A1 for crushing materials with a preset weight M1. The conveying unit 2 includes a first screw conveyor 21 and a second screw conveyor 22. The first screw conveyor 21 has a first conveying chamber B1 communicating with the crushing chamber A1 to receive the crushed materials in the crushing chamber A1. The second screw conveyor 22 has a second conveying chamber B2 communicating with the first conveying chamber B1. And the material conveying amount of the first screw conveyor 21 per unit time is greater than that of the second screw conveyor 22 per unit time. That is to say, there are two screw conveyors with different levels in the conveying unit of this application. The conveying rate of the first screw conveyor 21 is greater than that of the second screw conveyor 22. Therefore, the conveying accuracy of the second screw conveyor 22 is higher than that of the first screw conveyor 21.

[0047] The weighing unit 3 includes a first weighing sensor 31, a second weighing sensor 32 and a third weighing sensor 33 that are distributed in a triangular shape in the vertical projection. And the first weighing sensor 31 and the second weighing sensor 32 are respectively connected to the crushing unit 1, and the third weighing sensor 33 is connected to the conveying unit 2 to jointly weigh the nuclear power plant radioactive waste feed metering device. In this way, the weighing unit 3 uses a three-point support method to jointly bear the entire feed metering device, making the device layout stable in space and meeting the requirements of accurate metering at the same time. It can be understood that the material feed metering device of this application divides the material metering and feeding process into preliminary metering and feeding and accurate metering and feeding. The preliminary metering and feeding amount is controlled by the weighing unit 3 and the first screw conveyor 21. First, as the crushing and conveying processes proceed, the total weight of the feed metering device obtained by the weighing unit 3 gradually decreases until the actual discharge amount approaches the target discharge amount, and then the crusher 13 and the first screw conveyor 21 stop running.

[0048] In the accurate metering feeding, the material conveying is transferred to the weighing unit 3 and the second screw conveyor 22 with a smaller conveying capacity. A part of the material staying in the first conveying cavity B1 is conveyed to the outside of the device through the second conveying cavity B2 of the second screw conveyor 22. In this process, the total weight of the feeding metering device obtained by the weighing unit 3 is further reduced until the actual total discharge reaches the target total discharge, and then the second screw conveyor 32 is stopped. In other words, the present application realizes accurate metering feeding of materials by combining two screw conveyors with different conveying rates with three weighing sensors of the weighing unit.

[0049] Preferably, the rated conveying capacity of the second screw conveyor is 1 / 10 of the rated conveying capacity of the first screw conveyor, so as to achieve the best accurate metering feeding effect of radioactive waste.

[0050] Combination Figure 2 and Figure 3 As shown, Figure 2 It is a schematic diagram of the structure of the conveying unit of the feed metering device.

[0051] In one embodiment, the first screw conveyor 21 includes a first shell 212 having a first conveying chamber B1, a first drive motor 211 located outside the first conveying chamber B1, and a first screw 213 rotatably disposed in the first shell 212 and located in the first conveying chamber B1. In this way, the first screw conveyor 21 can conveniently receive the crushed material from the crusher 13, and under the action of the first screw 213, the material is transported to other locations through the first conveying chamber B1.

[0052] Figure 3 It is a side view of a feed metering device in one embodiment of the present application.

[0053] The first drive motor 211 is respectively connected to the rotating shaft in the pulverizer 13 and the rotating shaft driving the first screw 213 in the first screw conveyor 21. The transmission ratio between the first drive motor 211 and the pulverizer 13 is A, and the transmission ratio between the first drive motor 211 and the first screw 213 is B, wherein the ratio of A to B is a preset value. Specifically, if the rotating shaft speed in the pulverizer 13 is , the rotation speed of the first screw 213 is , because both are driven by the first drive motor 211, so A / B= / , the discharge amount of the pulverizer 13 is = , the conveying capacity of the first screw conveyor 21 is = ,in, is the discharge coefficient of the pulverizer 13, is the discharge coefficient of the first screw conveyor 21, and the numerical relationship between the discharge of the first screw conveyor 21 and the discharge of the crusher 13 is < <1.2 . That is to say, the first drive motor 211 is the common power source of the pulverizer 13 and the first screw 213. The first drive motor 211 can be driven to the pulverizer 13 and the first screw 213 after being decelerated by the gear set of the reducer 24. It can be understood that by designing the preset values ​​of the transmission ratio A and the transmission ratio B according to the above relationship, the discharge amount of the pulverizer 13 can be slightly lower than the conveying amount of the first screw conveyor 21, avoiding the blockage problem caused by the rate mismatch, thereby achieving the effect of synchronizing the material crushing rate and the material conveying rate. In addition, since the structural design of the shared motor of the present application reduces the number of electric components and interfaces, the sealing of the device is improved, and to a certain extent, it can effectively prevent the leakage of radioactive nuclear waste during the transportation process, thereby ensuring the safety of equipment and personnel.

[0054] In one embodiment, the second screw conveyor 22 includes a second housing 222 arranged in parallel with the first housing 212 and having a second conveying chamber B2, a second drive motor 221, and a second screw 223 rotatably arranged on the second housing 222, the second screw 223 extends out of the second conveying chamber B2 and is transmission-connected to the second drive motor 221, a connecting component 23 is arranged between the first housing 212 and the second housing 222, and a connecting channel B3 is formed on the connecting component 23, which is connected to the first conveying chamber B1 and the second conveying chamber B2 respectively. In this way, part of the material in the first conveying chamber B1 of the first screw conveyor 21 can enter the second conveying chamber B2 of the second screw conveyor 22 through the connecting channel B3, and the parallel arrangement of the first housing 212 and the second housing 222 can make the overall structure of the device more compact and also facilitate the stable conveying of materials.

[0055] Optionally, the first screw conveyor 21 and the second screw conveyor 22 can be flange-connected, and the connecting component 23 includes a first flange 231 connected to the first shell 212, a second flange 232 connected to the second shell 222, and a connecting pipe 233 connected between the first flange 231 and the second flange 232, and the connecting pipe 233 defines a connecting channel B3.

[0056] Therefore, in terms of structural layout, since the first screw conveyor 21 and the second screw conveyor 22 are integrally combined in a flange connection form, the layout space is greatly reduced, and the structural compactness is further improved. Moreover, the flange connection has high connection strength, so it can withstand greater pressure. The integrated structural design of the first screw conveyor 21 and the second screw conveyor 22 makes the device have better sealing performance, which can further prevent radioactive nuclear waste from leaking during transportation, thus improving the overall safety of the device. In addition, in this application, the input end of the controller 4 is electrically connected to the weighing module 3, and the output end of the controller 4 is electrically connected to the first drive motor 211 and the second drive motor 221. In this way, the controller 4 can integrally control the crusher 13, the first screw conveyor 21 and the second screw conveyor 22 according to the data of the weighing module 3, and adjust the speed through the frequency converter in the controller 4, so as to achieve accurate feeding and convenient debugging.

[0057] Please continue to refer to Figure 1 and Figure 2 , in one embodiment, the crushing unit 1 includes a crushing bin 11 with a crushing chamber A1, a bin 12 with a feeding chamber A2, a feeding valve and a crusher 13. A flow outlet communication port A3 that communicates with both the crushing chamber A1 and the feeding chamber A2 is provided at the bottom end of the bin 12, and a feeding valve is provided at the flow outlet communication port A3 to control the on-off of the crushing chamber A1 and the feeding chamber A2, so that the material in the feeding chamber A2 can flow into the crushing chamber A1. The crushing component of the crusher 13 penetrates through the crushing bin 11 and extends into the crushing chamber A1 to crush the material in the crushing chamber A1. In this way, a certain weight of material can be stored in the feeding chamber A2 of the bin 12. After the feeding valve is opened, the material can enter the crushing chamber A1 of the crushing bin 11 through the flow outlet communication port A3 and be crushed by the crushing component in the crusher 13. Optionally, the bin 12 and the crushing bin 11 are integrally formed, thereby improving the sealing performance of the crushing unit 1 and avoiding the risk of radioactive material diffusion.

[0058] In one embodiment, a high-level switch 33 and a low-level switch 34 are arranged at intervals along the first direction on the side wall of the bin 12. The high-level switch 33 is configured to trigger a high-level alarm signal when the material in the bin 12 is greater than the maximum preset amount, and the low-level switch 34 is configured to trigger a low-level alarm signal when the material in the bin 12 is less than the minimum preset amount. In this way, through the settings of the high-level switch 33 and the low-level switch 34, the weight of the material in the bin 12 can be controlled. On the one hand, it can prevent the material from overflowing when replenishing the material into the bin 12 exceeding its maximum capacity, and on the other hand, it can ensure that the bin 12 reserves the minimum weight of the material to provide necessary preparations for subsequent production.

[0059] In one embodiment, a vibration module 14 is provided on the side wall of the silo 12, and the vibration module 14 is located between the high-level switch 33 and the low-level switch 34. In this way, under the action of the vibration module 14, the silo 12 vibrates, driving the materials in the silo 12 to vibrate as well. The materials will pass through the outflow communication hole A3 more smoothly, thereby preventing the materials from blocking at the position of the outflow communication hole A3.

[0060] Please refer to Figure 3 , Figure 3 which is the flow chart of the metering and feeding method in this application.

[0061] The present invention provides a method for measuring the radioactive waste feed of a nuclear power plant, which includes the following steps: putting materials with a preset weight M1 into the crushing unit; crushing the materials in the crushing unit and conveying the materials in the crushing unit by the first screw conveyor of the conveying unit; obtaining the total weight of the feed measuring device in real time. When the total weight of the feed measuring device reaches the first preset weight M2, stop the crusher and the first screw conveyor in the crushing unit; start the second screw conveyor of the conveying unit; obtain the total weight of the feed measuring device in real time. When the total weight of the feed measuring device reaches the second preset weight M3, stop the metered feed. It can be understood that in this application, the metered feed of the materials is divided into preliminary metered feed and precise metered feed. In the preliminary metered feed stage, as the crushing process progresses for the materials with a preset weight of M1 in the crushing unit 1, the materials are gradually transported to the outside of the device through the first screw conveyor 21. Therefore, the total weight of the feed measuring device will gradually decrease. Here, the total weight of the feed measuring device refers to the sum of the net weight M0 of the feed measuring device and the material weight M1. Until the total weight of the feed measuring device measured by the weighing unit 3 reaches the first preset weight M2, stop the crusher 13 and the first screw conveyor 21 in the crushing unit 1. At this time, the preliminary metered feed is completed. It should be noted that this application controls the weight of the materials based on the subtraction method. The value obtained by M0 + M1 - M2 is a value close to the target feed total amount to be controlled. At this time, the difference between the precise target feed total amount to be controlled and the actual transported material weight in the preliminary metered feed stage is the material weight within a certain small range. If the first screw conveyor 21 continues to be used for conveying, it may cause the actual discharged total amount to be greater than the target discharged total amount to be controlled due to its large conveying capacity. And since the conveying capacity of the first screw conveyor 21 is greater than that of the second screw conveyor 22, therefore, it is necessary to stop the first screw conveyor 21 and enter the precise metered feed process, and start the second screw conveyor 22 with a smaller conveying capacity in the conveying unit 2, and convey the materials stored in the connection channel B3 and part of the materials on the first conveying chamber B1 to the outside through the second screw conveyor 21 until the total weight of the feed measuring device measured by the weighing module 32 reaches the second preset weight M3 to complete the precise metered feed process. At this time, the actual feed total amount is the target discharged total amount to be controlled. Thus, through the first screw conveyor 21, the second screw conveyor 22 and the weighing unit 3, combined with the corresponding control method, the preliminary metered feed process and the precise metered feed process are completed, so that the weight of the materials flowing out of the device is consistent with the precise discharged total amount to be controlled, realizing the precise metered feed of the materials.

[0062] In one embodiment, the crushing unit 1 includes a crushing bin 11 having a crushing chamber A1, a bin 12 having a feeding chamber A2, and a feeding valve provided at the connection between the bin 12 and the crushing bin 11 and used to control the on-off of the feeding chamber and the crushing chamber. The specific steps for feeding a material with a preset weight M1 into the crushing unit 1 are as follows: control the feeding valve to close; feed the material into the feeding chamber of the bin until the total weight measured by the feeding metering device reaches M0 + M1 and then stop feeding, where M0 is the net weight of the feeding metering device when no material is fed; control the feeding valve to open and crush the material entering the crushing chamber. That is to say, first close the feeding valve to form a sealed space at the lower part in the bin 12. As the material accumulated in the feeding chamber A2 increases, the value measured by the weighing unit 3 also gradually increases. When it reaches the preset weight M0 + M1, stop feeding. At this time, open the feeding valve to allow the material in the bin 12 to enter the crushing chamber A1 through the outflow communication hole A3 for further processing.

[0063] Optionally, the opening time of the feeding valve is T1, and the starting time for crushing the material in the crushing unit 1 is T1 + ΔT1, where ΔT1 is the first preset time period; the stopping time for crushing the material in the crushing unit 1 is T2, and the opening time of the second screw conveyor 22 is T2 + ΔT2, where ΔT2 is the second preset time period. In this way, by setting the first preset time period ΔT1, the weighing unit 3 has a suitable response time during the preliminary metering feeding process, overcoming the measurement error caused by the short-term fluctuation of the measurement result of the sensor inside the weighing unit 3 during actual weighing, so that the preliminary metering feeding amount is more accurate. Similarly, by setting the second preset time period ΔT2, the weighing unit 3 has a suitable response time during the precise metering feeding process, so that the precise metering feeding amount is more accurate.

[0064] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as falling within the scope described in this specification.

[0065] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent should be subject to the appended claims.

Claims

1. A radioactive waste feed metering device for a nuclear power plant, characterized in that, The nuclear power plant radioactive waste feed metering device comprises: A pulverizing unit (1), the pulverizing unit (1) having a pulverizing chamber (A1) for pulverizing materials of a preset weight M1; A conveying unit (2), the conveying unit (2) comprising a first screw conveyor (21) and a second screw conveyor (22), the first screw conveyor (21) having a first conveying chamber (B1) in communication with the crushing chamber (A1) to receive the crushed material in the crushing chamber (A1); the second screw conveyor (22) having a second conveying chamber (B2) in communication with the first conveying chamber (B1); and the material conveying amount per unit time of the first screw conveyor (21) is greater than the material conveying amount per unit time of the second screw conveyor (22); The weighing unit (3) comprises a first weighing sensor (31), a second weighing sensor (32) and a third weighing sensor (33) which are distributed in a triangular shape in vertical projection, wherein the first weighing sensor (31) and the second weighing sensor (32) are respectively connected to the crushing unit (1), and the third weighing sensor (33) is connected to the conveying unit (2), so as to jointly weigh the nuclear power plant radioactive waste feed metering device; the first screw conveyor (21) comprises a first shell (212) having the first conveying cavity (B1), a first driving motor (211) located outside the first conveying cavity (B1), and a first screw (213) rotatably arranged in the first shell (212) and located in the first conveying cavity (B1); The pulverizing unit (1) comprises a silo (12) having a feed cavity (A2), a pulverizing bin (11) having the pulverizing cavity (A1), a feed valve and a pulverizer (13); The first driving motor (211) is respectively connected in transmission with the pulverizer (13) and one end of the first screw (213) extending outside the first conveying chamber (B1); The transmission ratio between the first drive motor (211) and the pulverizer (13) is A, and the transmission ratio between the first drive motor (211) and the first screw (213) is B; Wherein, the ratio of A to B is a preset value.

2. The radioactive waste feed metering device for a nuclear power plant according to claim 1, wherein The second screw conveyor (22) comprises a second housing (222) arranged parallel to the first housing (212) and having the second conveying chamber (B2), a second driving motor (221), and a second screw (223) rotatably arranged on the second housing (222); The second screw (223) extends out of the second conveying chamber (B2) and is drivingly connected to the second driving motor (221); A connecting component (23) is provided between the first shell (212) and the second shell (222), and a connecting channel (B3) is formed on the connecting component (23) and is respectively connected to the first conveying cavity (B1) and the second conveying cavity (B2).

3. The radioactive waste feed metering device for a nuclear power plant according to claim 2, characterized in that, The connecting component (23) includes a first flange (231) connected to the first housing (212), a second flange (232) connected to the second housing (222), and a connecting pipe (233) connected between the first flange (231) and the second flange (232). The connecting pipe (233) defines the communication channel (B3).

4. The nuclear power plant radioactive waste feeding metering device according to claim 1, wherein a flow-out communication hole (A3) that communicates with the feeding chamber (A2) and the crushing chamber (A1) respectively is provided at the bottom end of the silo (12); a feeding valve is provided at the flow-out communication hole (A3) to control the on-off of the feeding chamber (A2) and the crushing chamber (A1); the crushing component of the crusher (13) penetrates through the crushing bin (11) and extends into the crushing chamber (A1) to crush the materials in the crushing chamber (A1).

5. The radioactive waste feed metering device for a nuclear power plant according to claim 4, wherein The silo (12) and the crushing bin (11) are integrally formed.

6. The radioactive waste feed metering device for a nuclear power plant according to claim 4, characterized in that, a high-level switch (34) and a low-level switch (35) are arranged at intervals along the first direction on the side wall of the silo (12); the high-level switch (34) is configured to trigger a high-level alarm signal when the materials in the silo (12) are greater than the maximum preset amount; the low-level switch (35) is configured to trigger a low-level alarm signal when the materials in the silo (12) are less than the minimum preset amount.

7. The radioactive waste feed metering device for a nuclear power plant according to claim 6, wherein a vibration module (14) is provided on the side wall of the silo (12), and the vibration module (14) is located between the high-level switch (34) and the low-level switch (35).

8. A method for measuring the radioactive waste feed of a nuclear power plant, characterized in that, For controlling the nuclear power plant radioactive waste feeding metering device according to any one of claims 1-7, the nuclear power plant radioactive waste feeding metering method includes the following steps: put materials with a preset weight M1 into the crushing unit (1); crush the materials in the crushing unit (1), and convey the materials in the crushing unit (1) by the first screw conveyor (21) of the conveying unit (2); acquire the total weight of the feeding metering device in real time. When the total weight of the feeding metering device reaches the first preset weight M2, stop the crusher (13) and the first screw conveyor (21) of the crushing unit (1); wherein, the total weight of the feeding metering device is the sum of the net weight of the feeding metering device and the weight of the materials; start the second screw conveyor (22) of the conveying unit (2); acquire the total weight of the feeding metering device in real time. When the total weight of the feeding metering device reaches the second preset weight M3, stop the metered feeding.

9. The method for measuring the radioactive waste feed of a nuclear power plant according to claim 8, characterized in that, The crushing unit (1) includes a silo (12) having a feeding chamber (A2), a crushing bin (11) having a crushing chamber (A1), and a feeding valve provided at the connection between the silo (12) and the crushing bin (11) and used to control the on-off of the feeding chamber (A2) and the crushing chamber (A1). The step of putting materials with a preset weight M1 into the crushing unit (1) specifically includes: control the feeding valve to close; Put materials into the feeding cavity (A2) of the silo (12) until the total weight of the feeding metering device reaches M0 + M1, and then stop feeding; Among them, M0 is the net weight of the feeding metering device when no materials are fed; Control the opening of the feeding valve and crush the materials entering the crushing cavity (A1).

10. The nuclear power plant radioactive waste feeding metering method according to claim 9, characterized in that The opening time of the feeding valve is T1, and the starting time of crushing the materials in the crushing unit (1) is T1 + ΔT1, where ΔT1 is the first preset time period; The time to stop crushing the materials in the crushing unit (1) is T2, and the opening time of the second screw conveyor (22) is T2 + ΔT2, where ΔT2 is the second preset time period.

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