Decontamination and cleaning device for surface pollution of radioactive substance storage and transportation container

Abstract

The utility model discloses a surface pollution decontaminating and cleaning device for a radioactive substance storage and transportation container. The surface pollution decontaminating and cleaning device comprises a cleaning machine frame, a cleaning machine box, an outer wall cleaning spray gun, an inner wall cleaning spray gun, a dry ice cleaning machine, a dust collection fan and a container cleaning base table. The cleaning machine box is installed on the cleaning machine frame. The container cleaning base table is connected to the cleaning rack in a sliding mode and can be switched between moving in or moving out of an inner cavity of the cleaning machine box. The container cleaning base table is used for loading a cleaned container and can drive the cleaned container to rotate. The outer wall cleaning spray gun and the inner wall cleaning spray gun are arranged to spray dry ice powder output by the dry ice cleaning machine to the outer wall or the inner cavity of the cleaned container, and radioactive pollutants on the surface of the cleaned container are converted into gaseous pollutants; the gas pollutants are output in a centralized manner through the dust collection fan; and the water is filtered and collected through the filter element, so that secondary pollution to the outside is effectively avoided.

Description

Technical Field

[0001] This utility model belongs to the field of nuclear technology—radioactive contamination treatment technology, specifically relating to a device for cleaning and decontaminating the surface of radioactive material storage and transportation containers. Background Technology

[0002] In existing technologies, storage containers are required during the storage and transportation of radioactive sources to prevent radiation contamination. However, these containers inevitably become contaminated with radioactive material during use, making them difficult to handle and even rendering them unusable. Decontamination of the storage containers allows for their recycling.

[0003] Currently, nuclear power plants primarily employ a chemical immersion combined with ultrasonic decontamination process for decontamination of radioactive storage containers. This process involves immersing the container in a chemical solution while simultaneously applying ultrasonic vibrations for surface cleaning. While this method is effective and causes minimal damage to the container's surface, the large amount of radioactive material dissolved in the chemical solution creates substantial radioactive waste, necessitating secondary pollution treatment that is more difficult and costly. Therefore, there is an urgent need to develop a decontamination and cleaning device that minimizes or eliminates secondary pollution. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, this utility model provides a device for cleaning and decontaminating the surface of radioactive material storage and transportation containers, thereby solving the technical problems of high automation and high cleaning efficiency while protecting personnel radiation safety.

[0005] To achieve the above objectives, the specific technical solution of this utility model is as follows:

[0006] A device for cleaning and decontaminating the surface of a radioactive material storage and transport container includes a cleaning frame, a cleaning chamber, an outer wall cleaning spray gun, an inner wall cleaning spray gun, a dry ice cleaning machine, a dust extraction fan, and a container cleaning platform; the cleaning chamber is mounted on the cleaning frame.

[0007] The container cleaning platform is slidably connected to the cleaning frame and can be switched between moving into or out of the cleaning chamber; the container cleaning platform is used to load the container to be cleaned and can drive the container to be cleaned to rotate.

[0008] Both the outer wall cleaning spray gun and the inner wall cleaning spray gun are connected to the dry ice cleaning machine, and are used to spray the dry ice powder output by the dry ice cleaning machine onto the outer wall or inner cavity of the container being cleaned.

[0009] The cleaning machine casing has a ventilation opening that communicates with the outside; the inlet of the vacuum fan is connected to the ventilation opening; and the vacuum fan has a filter element inside.

[0010] Furthermore, the container cleaning platform includes a rotary reducer, a mounting bracket, a limiting base, and a clamping assembly; the clamping assembly is disposed on the limiting base and is used to limit and clamp the container to be cleaned; the limiting base is disposed on the mounting bracket and can rotate under the drive of the rotary reducer.

[0011] Furthermore, the clamping assembly includes multiple support columns; each support column is fixed on the top surface of the limiting base and is evenly distributed circumferentially along the axis of the limiting base; each support column has an L-shaped limiting member at its top end; the limiting member is slidably connected to the top of the support column and is locked in position by bolts.

[0012] Furthermore, the cleaning chamber has multiple first operating holes and second operating holes arranged sequentially from top to bottom on both side walls; the outer wall cleaning spray gun is located at the first operating hole; and the inner wall cleaning spray gun is located at the second operating hole.

[0013] Furthermore, a cleaning inlet is provided on one side of the cleaning machine housing; a sealing door panel matching the cleaning inlet is provided on the cleaning frame; the sealing door panel is slidably connected to the cleaning frame and is used to close or open the cleaning inlet.

[0014] Furthermore, the first operating hole is provided with a plurality of outer spray gun clamps arranged in sequence; the second operating hole is provided with an inner spray gun clamp.

[0015] Furthermore, both the inner wall cleaning spray and the outer wall cleaning spray gun have nozzles at their nozzles; the nozzle on the outer wall cleaning spray gun is longer than or equal to the depth of the inner cavity of the container being cleaned.

[0016] Furthermore, a position sensor is installed inside the cleaning chamber.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. This utility model uses an outer wall cleaning spray gun and an inner wall cleaning spray gun to spray dry ice powder output from the dry ice cleaning machine onto the outer wall or inner cavity of the container being cleaned, thereby converting radioactive contaminants on the surface of the container into gaseous contaminants; the gaseous contaminants are concentrated and output by a dust extraction fan; and the gaseous contaminants are collected by a filter element, effectively avoiding secondary pollution to the outside world.

[0019] 2. This utility model adopts a dry ice spray cleaning process, which avoids the generation of a large amount of radioactive liquid in similar container rinsing and cleaning processes, greatly reduces pollution treatment costs, simplifies the cleaning process, avoids pollution of the production site, and improves work efficiency.

[0020] 3. This utility model uses a clamping component on a limiting base to limit the container being cleaned, and the limiting base can rotate under the drive of a rotary reducer, so that the container being cleaned can rotate during the cleaning process, thereby achieving thorough cleaning of the container.

[0021] 4. This utility model provides multiple first operating holes and second operating holes arranged sequentially from top to bottom on both sides of the cleaning chamber; this allows the device to perform all-round cleaning of radioactive containers of different sizes by selecting the operating hole position when cleaning them. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a schematic diagram showing the relative positions of the container cleaning station and the container loading and unloading station in this utility model;

[0024] Figure 3 This is a schematic diagram of the container cleaning base in this utility model;

[0025] Figure 4 This is a schematic diagram showing the relative positions of the container cleaning base and the closed door panel in this utility model;

[0026] Figure 5 This is a schematic diagram of the structure of the inner spray gun clamp and the outer spray gun clamp in this utility model.

[0027] Attached reference numerals: 1. Cleaning frame; 1-1. Container cleaning station; 1-2. Container loading and unloading station; 2. Cleaning machine housing; 2-1. External wall cleaning station; 2-2. Internal cavity cleaning station; 2-3. Internal spray gun clamp; 2-4. External spray gun clamp; 3. External wall cleaning spray gun; 4. Internal wall cleaning spray gun; 5. Container cleaning base; 5-1. Rotary reducer; 5-2. Limiting base; 5-3. Support column; 5-4. Limiting component; 6. Dry ice cleaning machine; 7. Dust extraction fan; 8. Enclosed door panel. Detailed Implementation

[0028] In the description of this utility model, it should be understood that the terms "one end", "the other end", "outer side", "upper side", "inner side", "horizontal", "coaxial", "center", "end", "length", "outer end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] The present invention will be further described below with reference to the accompanying drawings.

[0030] like Figure 1 and 2 As shown, a surface contamination removal and cleaning device for radioactive material storage and transportation containers includes a cleaning frame 1, a cleaning housing 2, an outer wall cleaning spray gun 3, an inner wall cleaning spray gun 4, a container cleaning base 5, a dry ice cleaning machine 6, and a dust extraction fan 7.

[0031] The cleaning frame 1 has two workstations: container cleaning workstation 1-1 and container loading / unloading workstation 1-2. The cleaning housing 2 is installed on container cleaning workstation 1-1. The container cleaning base 5 is slidably connected to the cleaning frame 1 and can be switched between container cleaning workstation 1-1 and container loading / unloading workstation 1-2 by means of a hydraulic push rod.

[0032] The radioactive container to be cleaned is installed onto the container cleaning platform 5 at container loading / unloading stations 1-2 using a robotic arm, and then moved into the cleaning machine housing 2 after installation. The outer wall cleaning spray gun 3 and the inner wall cleaning spray gun 4 spray dry ice powder output from the dry ice cleaning machine 6 onto the outer wall or inner cavity of the container to be cleaned, respectively. Under the action of high-pressure airflow purging, dry ice vaporization "explosion," and dry ice sublimation carrier, the radioactive contaminants on the surface of the container to be cleaned are peeled off, becoming gaseous contaminants. The gaseous contaminants are concentrated, filtered, and collected by the vacuum fan 7, which also collects the radioactive substances within them. Simultaneously, the container to be cleaned rotates under the drive of the container cleaning platform 5 during the cleaning process, thereby ensuring thorough cleaning of all parts of the container.

[0033] like Figure 3 As shown, the container cleaning platform 5 includes a rotary reducer 5-1, a mounting bracket, a limiting base 5-2, and a clamping assembly. The clamping assembly is mounted on the limiting base 5-2 and is used to limit and clamp the container to be cleaned. The limiting base 5-2 is mounted on the mounting bracket and can rotate under the drive of the rotary reducer 5-1, allowing the container to be cleaned to be cleaned 360 degrees.

[0034] The clamping assembly includes four support columns 5-3. The four support columns 5-3 are fixed to the top surface of the limiting base 5-2 and are evenly distributed circumferentially along the axis of the limiting base 5-2. Each support column 5-3 has an L-shaped limiting member 5-4 at its top. The limiting member 5-4 is slidably connected to the top of the support column 5-3 and can be locked in position by bolts when adjusted to fit the shape of the container being cleaned.

[0035] Specifically, a through slot is provided on the limiting member 5-4. A stepped surface is provided on the side wall of the through slot to support the end of the bolt. The bolt passes through the through slot on the limiting member 5-4, and its bottom is threadedly connected to the support column 5-3. Tightening or loosening the bolt locks or unlocks the position of the limiting member 5-4. After the limiting member 5-4 is adjusted to the outer wall of the container being cleaned, the limiting base 5-2 gradually moves into the cleaning machine housing 2. The inner cavity and outer wall of the container being cleaned are sprayed and cleaned by the inner wall cleaning spray and the outer wall cleaning spray gun 3, respectively.

[0036] like Figure 1 and 5 As shown, both the inner wall cleaning spray gun and the outer wall cleaning spray gun 3 have nozzles, allowing the dry ice output from the dry ice cleaning machine 6 to be concentrated and output to a designated area of ​​the container being cleaned. The length of the nozzle on the outer wall cleaning spray gun 3 is greater than or equal to the depth of the inner cavity of the container being cleaned. During cleaning, the nozzle on the outer wall cleaning spray gun 3 extends into the inner cavity of the container being cleaned and gradually completes the cleaning process.

[0037] Furthermore, such as Figure 1 and 5 As shown, the cleaning machine housing 2 has an outer wall cleaning station 2-1 and an inner cavity cleaning station 2-2 on its two side walls, respectively. The outer wall cleaning station 2-1 of the cleaning machine housing 2 has multiple first operating holes arranged sequentially from top to bottom. Each first operating hole corresponds to the cleaning of the outer wall and bottom area of ​​containers of different sizes. During cleaning, the operator operates the outer wall cleaning spray gun 3 at the corresponding first operating hole to perform the spraying operation, thereby completing the cleaning of various parts of the outer wall of the container.

[0038] like Figure 5 As shown, multiple external spray gun clamps 2-4 are provided at the external wall cleaning station 2-1 to hold the external wall cleaning spray guns 3 after the spraying work is completed, so that the staff can pick them up for the next spraying work.

[0039] The inner cavity cleaning station 2-2 is equipped with a second operating port, through which the operator can control the inner wall cleaning spray gun 4 to spray and clean the inner cavity of the container being cleaned. During operation, the operator operates the nozzle of the inner wall cleaning spray gun 4 to extend into the inner cavity of the container being cleaned, and by operating the inner wall cleaning spray gun 4, the inner cavity and top surface area of ​​the container being cleaned are cleaned.

[0040] Furthermore, an internal spray gun clamp 2-3 is provided at the internal cleaning station 2-2 to hold the internal wall cleaning spray gun 4 after the spraying work is completed, so that the staff can take it out for the next spraying work.

[0041] In this embodiment, protective gloves are provided at both the first and second operating ports. During cleaning, the operator wears protective gloves and operates the inner wall cleaning spray gun 4 or the outer wall cleaning spray gun 3 to clean the inner cavity or outer wall of the container being cleaned.

[0042] like Figure 1 and 4 As shown, the cleaning chamber 2 has a cleaning inlet on the side facing the container loading / unloading station 1-2. A sealing door 8 is installed on the cleaning inlet side of the cleaning chamber 2. The sealing door 8 is slidably connected to the cleaning frame 1. When the container cleaning platform 5, containing the container to be cleaned, is moved into the cleaning chamber 2, the sealing door 8 slides towards the cleaning inlet side and gradually closes the cleaning inlet, forming a closed cleaning chamber inside the cleaning chamber 2 to prevent the leakage of gaseous pollutants.

[0043] In this embodiment, the top surface of the cleaning frame 1 is provided with a slide rail connecting the container cleaning station 1-1 and the container loading and unloading station 1-2. The bottom of the limiting base 5-2 and the closed door plate 8 are respectively provided with a first pulley and a second pulley that cooperate with the slide rail. The limiting base 5-2 and the closed door plate 8 slide towards one side of the cleaning machine box 2 via the first pulley and the second pulley, respectively.

[0044] Furthermore, a position sensor is provided on the container cleaning station 1-1 of the cleaning frame to limit the extreme position of the container cleaning base 5 entering the cleaning chamber 2.

[0045] In this embodiment, the cleaning chamber 2 has a ventilation opening that communicates with the outside. The inlet of the vacuum cleaner 7 is connected to the ventilation opening. After the dry ice spray cleaning operation is completed, the vacuum cleaner 7 outputs the gaseous pollutants in the cleaning chamber and collects them through the filter element inside the vacuum cleaner 7.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A device for cleaning and decontaminating the surface of a radioactive material storage and transport container, comprising a cleaning frame (1) and a cleaning housing (2); wherein the cleaning housing (2) is mounted on the cleaning frame (1); characterized in that: It also includes an outer wall cleaning spray gun (3), an inner wall cleaning spray gun (4), a dry ice cleaner, a vacuum blower (7), and a container cleaning platform (5); The container cleaning platform (5) is slidably connected to the cleaning frame (1) and can switch between moving into or out of the inner cavity of the cleaning chamber (2); the container cleaning platform (5) is used to load the container to be cleaned and can drive the container to be cleaned to rotate. The outer wall cleaning spray gun (3) and the inner wall cleaning spray gun (4) are both connected to the dry ice cleaning machine (6) and are used to spray the dry ice powder output by the dry ice cleaning machine (6) onto the outer wall or inner cavity of the container being cleaned. The cleaning machine box (2) is provided with a ventilation opening that communicates with the outside; the inlet of the vacuum blower (7) is connected to the ventilation opening; the vacuum blower (7) shown is provided with a filter element; The cleaning machine box (2) has multiple first operating holes and second operating holes arranged sequentially from top to bottom on both side walls; the outer wall cleaning spray gun (3) is located at the first operating hole; the inner wall cleaning spray gun (4) is located at the second operating hole. A cleaning inlet is provided on one side of the cleaning machine box; a closed door panel (8) matching the cleaning inlet is provided on the cleaning frame (1); the closed door panel (8) is slidably connected to the cleaning frame (1) and is used to close or open the cleaning inlet; The first operating hole is provided with a plurality of outer spray gun clamps (2-4) arranged in sequence; the second operating hole is provided with an inner spray gun clamp (2-3).

2. The device for cleaning and decontaminating the surface of a radioactive material storage and transportation container according to claim 1, characterized in that: The container cleaning platform (5) includes a rotary reducer (5-1), a mounting bracket, a limiting base (5-2), and a clamping assembly; the clamping assembly is disposed on the limiting base (5-2) and is used to limit and clamp the container to be cleaned; the limiting base (5-2) is disposed on the mounting bracket and can rotate under the drive of the rotary reducer (5-1).

3. The device for cleaning and decontaminating the surface of a radioactive material storage and transportation container according to claim 2, characterized in that: The clamping assembly includes multiple support columns (5-3); each support column (5-3) is fixed on the top surface of the limiting base (5-2) and is evenly distributed around the axis of the limiting base (5-2); each support column (5-3) has an L-shaped limiting member (5-4) at its top end; the limiting member (5-4) is slidably connected to the top of the support column (5-3) and is locked in position by bolts.

4. The device for cleaning and decontaminating the surface of a radioactive material storage and transportation container according to claim 1, characterized in that: Both the inner wall cleaning spray and the outer wall cleaning spray gun (3) are equipped with nozzles; the nozzle on the outer wall cleaning spray gun (3) is longer than or equal to the depth of the inner cavity of the container being cleaned.

5. The device for cleaning and decontaminating the surface of a radioactive material storage and transportation container according to claim 1, characterized in that: The cleaning machine housing (2) is equipped with a position sensor inside.

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