Cleaning device for pollutants on surfaces of inner and outer shells of sealed radioactive source

Abstract

The utility model discloses a device for cleaning pollutants on the surfaces of inner and outer shells of a sealed radioactive source. The device comprises a shell cleaning table, a dry ice manufacturing module, a shell cleaning module and a dust collection fan, the dry ice manufacturing module is used for generating dry ice particles and outputting the dry ice particles. And the cladding cleaning module comprises a limiting driving assembly and a cladding cleaning assembly. The limiting driving assembly is used for limiting the position of the cleaned cladding and driving the cleaned cladding to rotate in the circumferential direction. The cladding cleaning assembly is used for spraying dry ice particles to a cleaned cladding placed on the cladding cleaning table. And the dust collection fan is used for intensively discharging radioactive pollutants peeled off through dry ice cleaning. The two rotating shafts capable of rotating under the driving of the circumferential driving assembly are arranged on the cladding cleaning table. The two rotating shafts drive the cleaned cladding to rotate, so that the cladding cleaning assembly can evenly spray dry ice to the radioactive cladding, and residues of radioactive substances are effectively avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of nuclear technology application-radioactive pollution removal, and specifically relates to a device for cleaning pollutants on the surfaces of inner and outer claddings of a sealed radioactive source. Background Art

[0002] In the process of open production of sealed radioactive sources, radioactive contamination will inevitably occur on the surface of the inner and outer cladding. According to national standards, the total amount of radioactive contamination on the surface of sealed radioactive sources must be removed to less than 200Bq. Therefore, in the production process of cobalt-60 industrial sources, a process and equipment must be developed to effectively clean and decontaminate the inner and outer cladding surfaces of the radioactive sources to meet national standards. For the open production of cobalt-60 industrial sources, during the disassembly of cobalt rod bundles, radioactive source packaging, welding, and transportation, radioactive cobalt-60 will form a viscous contaminant with the oily substance in the hot chamber, and then exist on the surface of the cladding used to store cobalt-60 radioactive sources in the form of physical adsorption; in addition, under the dual effects of welding and strong gamma fields, the spilled cobalt-60 particles are oxidized to a divalent state at high temperature, and are easily firmly combined with ionized electrostatic dust in the air to form an aerosol. In addition, cobalt-60 has paramagnetic properties, and is finally adsorbed on the surface of the cladding and is difficult to remove.

[0003] At present, the common method for cleaning and decontaminating radioactive sources at home and abroad is chemical decontamination, which is to soak the sealed radioactive source with a variety of chemical decontaminants, stimulate the activity of surface contaminants through the surface and form a complex, which is then detached under the action of special chemical solvents to form radioactive waste liquid for discharge and collection. This method has low removal efficiency, high cost, large amount of waste, difficult to handle radioactive waste liquid, and high risk of radiation contamination. The negative impact, high price and cost it brings have an unsustainable adverse impact on the production of cobalt-60 industrial sources, and even affect the normal operation of the enterprise itself. Therefore, it is very necessary to optimize the process equipment, improve the efficiency of cladding cleaning, reduce the risk of radiation contamination, reduce waste production, and even realize the automated production of cobalt-60 industrial sources. Utility Model Content

[0004] In order to make up for the deficiencies of the prior art, the utility model provides a device for cleaning contaminants on the surfaces of inner and outer claddings of a sealed radioactive source, so as to solve the technical problems of low cladding cleaning efficiency, serious contamination, and difficulty in handling radioactive waste liquid.

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

[0006] In a first aspect, a method for cleaning contaminants on the surface of inner and outer claddings of a sealed radioactive source includes a cladding cleaning station;

[0007] A dry ice production module is used to generate dry ice particles and output them.

[0008] The cladding cleaning module includes a limit drive assembly and a cladding cleaning assembly. The limit drive assembly is used to limit the position of the cladding to be cleaned and drive the cladding to be cleaned to rotate circumferentially. The cladding cleaning assembly is used to spray dry ice particles onto the cladding to be cleaned placed on the cladding cleaning table.

[0009] A dust suction fan is used to centrally discharge radioactive pollutants peeled off by dry ice cleaning.

[0010] Furthermore, the position limiting drive assembly includes a mounting frame, a rotating shaft and a circumferential drive assembly. The mounting frame is fixed on the cladding cleaning table. Two rotating shafts arranged at intervals are both rotatably connected to the mounting frame, and the interval space between them forms a cleaning area for cleaning the cladding to be cleaned. The two rotating shafts rotate under the drive of the circumferential drive assembly.

[0011] Furthermore, the cladding cleaning assembly includes a cleaning nozzle, a mounting base and a displacement drive assembly. The cleaning nozzle is slidably connected to the cladding cleaning table through the mounting base and is located directly above the cleaning area. The cleaning nozzle can reciprocate along the cleaning area under the drive of the displacement drive assembly.

[0012] Furthermore, a support bracket matched with the mounting base is fixed on the shell cleaning table. A threaded rod is rotatably connected to the support bracket. The threaded rod passes through the threaded hole of the mounting base and is threadably matched with the threaded hole. The threaded rod can rotate clockwise or counterclockwise under the drive of the displacement drive assembly.

[0013] Furthermore, the cleaning nozzle is mounted on the mounting base via a fixing frame, the top of the fixing frame is rotatably matched with the mounting base, and both ends of the support bracket are provided with ejector pins matched with the fixing frame.

[0014] Furthermore, the shell cleaning table is divided into a cleaning table body and a cleaning table back plate. A cover shell is hingedly provided on the top of the cleaning table back plate. The cleaning table body is provided with a cleaning air duct corresponding to the cleaning area. The cleaning air duct is provided below the cleaning area.

[0015] Furthermore, the circumferential drive assembly includes a circumferential drive motor. One of the rotating shafts is connected to the output shaft of the circumferential drive motor. The two rotating shafts are respectively provided with gears meshing with each other.

[0016] Furthermore, the displacement drive assembly includes a displacement drive motor and a first transmission connecting rod. The first transmission connecting rod is rotatably connected to the back plate of the washing table and can be rotated under the drive of the displacement drive motor. A first bevel gear is fixed to the end of the first transmission connecting rod. A second bevel gear matched with the first bevel gear is fixed to the end of the threaded rod.

[0017] In a second aspect, a method for cleaning the inner and outer shells of a radioactive source, using the cleaning device described in the first aspect, comprises the following steps:

[0018] Step 1: open the cover set on the cladding cleaning table, place the cleaned cladding in the cleaning area between the two rotating shafts by a robotic arm, and after placement, flip the cover by the robotic arm to close the table top of the cladding cleaning table.

[0019] Step 2, prepare dry ice; use the milling cutter in the dry ice preparation device to quickly and high-speed spin mill the dry ice into uniform particles of 0.2-3 mm; use the dry ice jet machine to transport the dry ice particles generated by spin milling to the cleaning nozzle, and spray them onto the outer surface of the cleaned cladding through the cleaning nozzle.

[0020] Step 3: The cladding to be cleaned rotates 360° under the drive of the circumferential drive assembly. At the same time, the cleaning nozzle reciprocates under the drive of the displacement drive assembly, and the input dry ice is evenly sprayed onto various parts of the cladding to be cleaned.

[0021] Step 4: Start the dust suction fan, which will centrally output the radioactive pollutants peeled off from the cleaned cladding and collect the radioactive pollutants through the filter element in the dust suction fan.

[0022] Step 5: Open the cover, remove the cleaned cladding by a robotic arm, and complete the cleaning of the surface of the cleaned cladding.

[0023] Furthermore, in step three, the dry ice blasting pipeline pressure is continuously maintained above 0.1-1 MPa, and the dry ice blasting temperature is continuously maintained below -78°C.

[0024] Compared with the prior art, the utility model has the following advantages:

[0025] 1. The utility model provides two rotating shafts on the cladding cleaning table that can rotate under the drive of the circumferential driving assembly. The two rotating shafts drive the cladding to be cleaned to rotate, so that the cladding cleaning assembly can evenly spray dry ice onto the radioactive cladding, effectively avoiding the residue of radioactive substances.

[0026] 2. The utility model provides a cleaning nozzle that can reciprocate along the cleaning area. At the same time, ejectors that cooperate with the fixing frame are provided at both ends of the supporting bracket, so that when the cleaning nozzle moves to the two ends of the cleaned cladding, it can be tilted by cooperating with the ejector to clean the ends of the cleaned cladding.

[0027] 3. The utility model provides a cleaning table back plate on the cleaning table body, and a cover shell hinged on the top thereof. The cover shell can be switched between a closed cleaning table body surface and an open cleaning table body surface under the drive of the manipulator. When the cover shell rotates to the position of closing the cleaning table body, the cover shell cooperates with the cleaning table back plate to form a cleaning chamber of the cleaning area in the closed cladding cleaning module, so that when dry ice cleaning is used, the radioactive contaminants on the surface of the cleaned cladding can be bound in the cleaning chamber, effectively preventing the suspended small particles of radioactive contaminants formed by a large amount of dry ice cleaning from escaping.

[0028] 4. The utility model provides a cleaning air duct matched with the cleaning area on the cladding cleaning table, so that the radioactive pollutants peeled off by dry ice cleaning can be centrally output through the cleaning air duct and collected by the filter element in the dust suction fan, thereby avoiding secondary pollution caused by the escape of radioactive pollutants during the cleaning process. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0030] Figure 2 This is a schematic diagram of the relative positions of the limit drive assembly and the cladding cleaning assembly in the utility model;

[0031] Figure 3 This is a schematic diagram of the structure of the cladding cleaning assembly in the utility model;

[0032] Figure 4 This is a schematic diagram of the relative position of the cover shell in the open state and the back plate of the washing table in the utility model;

[0033] Figure 5 This is a schematic diagram of the relative positions of the housing limit drive assembly and the cleaning air duct in the utility model;

[0034] Figure 6 This is a schematic diagram of the structure of the cleaning box in the utility model;

[0035] Figure 7 It is a schematic diagram of the structure of the circumferential drive component and the displacement drive component in the utility model.

[0036] Figure numerals: 1, cladding cleaning station; 1-1, cleaning station body; 1-2, cleaning station back plate; 1-3, cover shell; 2, limit drive assembly; 2-1, mounting frame; 2-2, rotating shaft; 2-3, rotating wheel; 2-4, limit member; 2-5, gear; 3, cladding cleaning assembly; 3-1, cleaning nozzle; 3-2, mounting base; 3-3, threaded rod; 3-4, fixing frame; 3-5, ejector pin; 4, circumferential drive assembly; 4-1, second transmission shaft; 4-2, third bevel gear; 4-3, fourth bevel gear; 5, displacement drive assembly; 5-1, first transmission connecting rod; 5-2, first bevel gear; 5-3, second bevel gear; 6, cleaning air duct; 7, cleaning box; 8, cleaned cladding. DETAILED DESCRIPTION

[0037] In the description of the present invention, it should be understood that the terms "one end", "the other end", "outside", "upper", "inside", "horizontal", "coaxial", "center", "end", "length", "outer end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 understood as a limitation on the present invention.

[0038] The utility model will be further described below in conjunction with the accompanying drawings.

[0039] like Figure 1 As shown, a method for cleaning the surface contaminants of the inner and outer claddings of a sealed radioactive source comprises a cladding cleaning station 1, a dust suction fan, a dry ice manufacturing module and a cladding cleaning module. The dry ice manufacturing module is used to provide dry ice to the cladding cleaning module, and the dry ice is used to clean the cladding containing radioactivity. The dust suction fan is used to centrally discharge the radioactive contaminants peeled off by dry ice cleaning, and collect the radioactive contaminants through the filter element in the dust suction fan.

[0040] like Figure 1-3 As shown, the cladding cleaning module includes a limit drive assembly 2 and a cladding cleaning assembly 3. The cladding cleaning assembly 3 is used to spray the input dry ice onto the cleaned cladding 8 containing radioactive contaminants placed on the cladding cleaning station 1. The limit drive assembly 2 is used to limit the position of the cleaned cladding 8 and drive the cleaned cladding 8 to rotate circumferentially, so that the dry ice sprayed by the cladding cleaning assembly 3 can be evenly sprayed on various parts of the cleaned cladding 8.

[0041] Specifically, Figure 2As shown, the limit drive assembly 2 includes a mounting frame 2-1, a rotating shaft 2-2 and a circumferential drive assembly 4. Among them, the mounting frame 2-1 is fixed on the cladding cleaning station 1 and is located directly below the cladding cleaning assembly 3. The two rotating shafts 2-2 are rotatably connected to the mounting frame 2-1, and the interval space between them forms a cleaning area for cleaning the cleaned cladding 8. The two rotating shafts 2-2 rotate under the drive of the circumferential drive assembly 4, and drive the cleaned cladding 8 in the cleaning area to rotate, thereby achieving that the dry ice sprayed by the cladding cleaning assembly 3 can be evenly sprayed on various parts of the cleaned cladding 8.

[0042] Furthermore, a plurality of rotating wheels 2-3 are arranged at intervals on the two rotating shafts 2-2. The rotating wheels 2-3 are fixed on the rotating shafts 2-2 by screws. The cleaning cladding 8 is further clamped and limited by the rotating wheels 2-3 to ensure that when the two rotating shafts 2-2 rotate, the cleaning cladding 8 can rotate synchronously to avoid slipping.

[0043] Furthermore, the length of the rotating shaft 2-2 is adapted to the cleaned cladding 8. Limiting members 2-4 are provided at both ends of the mounting frame 2-1. The limiting members 2-4 can be adjusted along the length direction of the rotating shaft 2-2, and after being adjusted to a position adapted to the length of the cleaned cladding 8, are locked by screws. During cleaning, the cleaned cladding 8 is placed between the two limiting members 2-4 by a mechanical arm, and its two ends are limited by the limiting members 2-4, so as to prevent the cleaned cladding 8 from sliding along the axial direction when the rotating shaft 2-2 drives the cleaned cladding 8 to rotate.

[0044] like Figure 7 As shown, the circumferential drive assembly 4 includes a circumferential drive motor. One of the rotating shafts 2-2 is connected to the output shaft of the circumferential drive motor and can rotate under the drive of the circumferential drive motor.

[0045] Specifically, the two rotating shafts 2-2 are respectively provided with gears meshing with each other. When working, one of the rotating shafts 2-2 is driven to rotate by the circumferential driving motor, and the two rotating shafts 2-2 are driven to rotate under the transmission of the two meshing gears, thereby driving the cleaned cladding 8 located in the limiting area to rotate.

[0046] like Figure 3 As shown, the cladding cleaning assembly 3 includes a cleaning nozzle 3-1, a mounting base 3-2 and a displacement drive assembly 5. The cleaning nozzle 3-1 is slidably connected to the cladding cleaning platform 1 through the mounting base 3-2, and is driven by the displacement drive assembly 5 to reciprocate to spray the input dry ice onto the cladding 8 to be cleaned.

[0047] Specifically, a support bracket corresponding to the mounting frame 2-1 is provided on the cladding cleaning station 1. A threaded rod 3-3 is rotatably connected to the support bracket. A threaded hole matching the threaded rod 3-3 is provided on the mounting base 3-2. The threaded rod 3-3 passes through the threaded hole and is threadedly matched with the threaded hole. The threaded rod 3-3 can rotate forward and reversely under the drive of the displacement drive assembly 5, thereby driving the cleaning nozzle 3-1 on the mounting base 3-2 to reciprocate along the cleaning area on the mounting frame 2-1, and fully cleaning the cladding 8 to be cleaned in the cleaning area.

[0048] In this embodiment, two guide rods are fixed between the two support brackets. The mounting base 3-2 is provided with limit holes that match the two guide rods. The two guide rods pass through the two limit holes respectively to prevent the mounting base 3-2 from rotating synchronously with the threaded rod 3-3 during the process of being driven by the threaded rod 3-3.

[0049] Furthermore, in this embodiment, the cleaning nozzle 3-1 is mounted on the mounting base 3-2 via a fixing frame 3-4, wherein the top of the fixing frame 3-4 is rotatably matched with the mounting base 3-2, and both ends of the support bracket are provided with ejector pins 3-5 matched with the fixing frame 3-4.

[0050] During the cleaning process, the cleaning nozzle 3-1, in cooperation with the fixing frame 3-4 and the ejector pin 3-5, has two working states, namely, the surface cleaning state and the end cleaning state. In the initial state, the fixing frame 3-4 and the cleaning nozzle 3-1 are in a vertical downward surface cleaning state under the action of gravity, and the surface of the cleaned cladding 8 located directly below the cleaning nozzle 3-1 is cleaned with dry ice. When the displacement drive assembly 5 drives the cleaning nozzle 3-1 to move to the ends of both sides of the support bracket, the ejector pin 3-5 provided on the support bracket cooperates with the fixing frame 3-4 to drive the cleaning nozzle 3-1 to switch to the end cleaning state, and the surfaces of both ends of the cleaned cladding 8 are cleaned with dry ice.

[0051] like Figure 4 and 5 As shown, in this embodiment, the cladding cleaning station 1 is divided into a cleaning station body 1-1 and a cleaning station back plate 1-2. Among them, a cover shell 1-3 is hingedly provided on the top of the cleaning station back plate 1-2. Driven by the manipulator, the cover shell 1-3 can switch between a closed cleaning station body 1-1 table top and an open cleaning station body 1-1 table top. When the cover shell 1-3 rotates to the position of closing the cleaning station body 1-1, the cover shell 1-3 cooperates with the cleaning station back plate 1-2 to form a cleaning chamber of the cleaning area in the closed cladding cleaning module, so that the radioactive contaminants on the surface of the cleaned cladding 8 can be confined in the cleaning chamber when being cleaned by dry ice, thereby preventing small particles of radioactive contaminants from escaping in a suspended state due to a large amount of dry ice cleaning.

[0052] Further, such as Figure 5 As shown, a cleaning air duct 6 matching the cleaning area is provided on the cladding cleaning station 1. The cleaning air duct 6 is arranged just below the cleaning area.

[0053] In this embodiment, the two ends of the cleaning air duct 6 are divided into an input port and an output port. The input port is in the shape of a trumpet with a large top and a small bottom, so that the radioactive contaminants peeled off by dry ice cleaning can be centrally output through the cleaning air duct 6. The pipe through the air inlet of the dust suction fan is connected to the output port of the cleaning air duct 6. During the cleaning process, the dust suction fan provides suction to the cleaning chamber, centrally outputs the peeled and suspended radioactive contaminants, and collects them through the filter element in the dust suction fan.

[0054] like Figure 7 As shown, the displacement drive assembly 5 includes a displacement drive motor and a first transmission connecting rod 5-1. The first transmission connecting rod 5-1 is rotatably connected to the back plate 1-2 of the washing table and can be rotated under the drive of the displacement drive motor. A first bevel gear 5-2 is fixed to the end of the first transmission connecting rod 5-1. A second bevel gear 5-3 that matches the first bevel gear 5-2 is fixed to the end of the threaded rod 3-3.

[0055] During operation, the first transmission connecting rod 5-1 is rotated by the displacement driving motor, and the first bevel gear 5-2 and the second bevel gear 5-3 cooperate with each other to drive the threaded rod 3-3 to rotate, thereby driving the cleaning nozzle 3-1 to reciprocate along the cleaning area.

[0056] like Figure 6 As shown, in this embodiment, the device further comprises a cleaning box 7 for storing the cladding cleaning module. The cleaning box 7 forms a closed environment around the cladding cleaning station 1, thereby reducing the impact of radioactive contaminants on the cleaned cladding 8 on the outside.

[0057] Furthermore, in the present embodiment, there are two cladding cleaning modules, which are divided into an inner cladding cleaning module and an outer cladding cleaning module, which are used to clean the inner cladding and the outer cladding respectively.

[0058] like Figure 7 As shown, the circumferential drive assembly 4 in the inner shell cleaning module also includes a second transmission shaft 4-1. The second transmission shaft 4-1 is rotatably connected to the back plate 1-2 of the cleaning table, and a third bevel gear 4-2 for transmission is fixed at the end. A fourth bevel gear 4-3 meshing with the third bevel gear 4-2 is fixed on one of the rotating shafts 2-2 mounted on the mounting frame 2-1. During operation, the second transmission shaft 4-1 is driven to rotate by the circumferential drive motor, and the corresponding rotating shaft 2-2 is driven to rotate with the cooperation of the third bevel gear 4-2 and the fourth bevel gear 4-3. With the cooperation of the gears on the two rotating shafts 2-2, the two rotating shafts 2-2 rotate in coordination, driving the cleaned shell to rotate 360°.

[0059] Furthermore, a third transmission shaft is installed on the output shaft of the circumferential drive motor, and the inner end of the third transmission shaft is connected to the second transmission shaft 4-1 via a universal coupling.

[0060] The utility model is used for the cleaning method of the inner and outer shells of the radioactive source, which comprises the following steps:

[0061] Step 1: Open the cover 1-3 disposed on the cladding cleaning station 1, adjust the distance between the two stoppers 2-4 according to the length of the cladding 8 to be cleaned, and lock them.

[0062] Step 2: The cleaned cladding 8 is placed in the cleaning area between the two rotating shafts 2 - 2 by a robot arm, and after the placement is completed, the cover 1 - 3 is turned over by the robot arm to cover the table surface of the cladding cleaning table 1 .

[0063] Step 3: Prepare dry ice; use the milling cutter in the dry ice preparation device to quickly and high-speed spin mill the dry ice into uniform particles of 0.2-3 mm (adjustable);

[0064] Step 4: The dry ice particles generated by the rotary milling are transported to the cleaning nozzle 3-1 by the dry ice blasting machine, and sprayed to the outer surface of the cleaned cladding 8 through the cleaning nozzle 3-1. The pressure of the dry ice blasting pipeline is continuously maintained at more than 0.1-1MPa, and the dry ice blasting temperature is continuously maintained at less than -78°C.

[0065] Step 5: The cleaned cladding 8 rotates 360° under the drive of the circumferential drive assembly 4. At the same time, the cleaning nozzle 3-1 reciprocates under the drive of the displacement drive assembly 5, and the input dry ice is evenly sprayed onto various parts of the cleaned cladding 8.

[0066] Step 6: Start the dust suction fan, which will centrally output the radioactive pollutants peeled off from the cleaned cladding 8 and collect the radioactive pollutants through the filter element in the dust suction fan.

[0067] Step seven, open the cover shell 1-3, remove the cleaned cladding shell 8 by a robot arm, and complete the cleaning of the surface of the cleaned cladding shell 8.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A device for cleaning contaminants on the surface of the inner and outer shells of a sealed radioactive source, characterized in that: It comprises a cladding cleaning station (1); A dry ice manufacturing module, wherein the dry ice manufacturing module is used to generate dry ice particles and output them; A cladding cleaning module, the cladding cleaning module comprising a limit drive assembly (2) and a cladding cleaning assembly (3); the limit drive assembly (2) is used to limit the position of the cladding (8) to be cleaned and drive the cladding (8) to be cleaned to rotate in a circumferential direction; the cladding cleaning assembly (3) is used to spray dry ice particles onto the cladding (8) to be cleaned placed on the cladding cleaning table (1); A dust suction fan is used to centrally discharge radioactive pollutants peeled off by dry ice cleaning.

2. A device for cleaning contaminants on the surface of inner and outer shells of a radioactive source according to claim 1, characterized in that: The position-limiting drive assembly (2) comprises a mounting frame (2-1), a rotating shaft (2-2) and a circumferential drive assembly (4); the mounting frame (2-1) is fixed on the cladding cleaning platform (1); the two rotating shafts (2-2) are both rotatably connected to the mounting frame (2-1) and are arranged at intervals, and the interval space between them forms a cleaning area for position-limiting cleaning of the cladding (8) to be cleaned; the two rotating shafts (2-2) can rotate under the drive of the circumferential drive assembly (4).

3. The device for cleaning contaminants on the surface of the inner and outer shells of a radioactive source according to claim 2, characterized in that: The cladding cleaning assembly (3) comprises a cleaning nozzle (3-1), a mounting base (3-2) and a displacement drive assembly (5); the cleaning nozzle (3-1) is slidably connected to the cladding cleaning table (1) via the mounting base (3-2) and is located directly above the cleaning area; The cleaning nozzle (3-1) can be driven by the displacement driving component (5) to reciprocate along the cleaning area.

4. A device for cleaning contaminants on the surface of inner and outer shells of a radioactive source according to claim 3, characterized in that: A support bracket matched with the mounting base (3-2) is fixed on the cladding cleaning table (1); a threaded rod (3-3) is rotatably connected to the support bracket; the threaded rod (3-3) passes through a threaded hole of the mounting base (3-2) and is threadably matched with the threaded hole; the threaded rod (3-3) can rotate clockwise or counterclockwise under the drive of the displacement drive component (5).

5. The device for cleaning contaminants on the surface of the inner and outer shells of a radioactive source according to claim 4, characterized in that: The cleaning nozzle (3-1) is mounted on the mounting base (3-2) via a fixing frame (3-4); the top of the fixing frame (3-4) is rotatably matched with the mounting base (3-2); and both ends of the support bracket are provided with ejector pins (3-5) matched with the fixing frame (3-4).

6. The device for cleaning contaminants on the surface of the inner and outer shells of a radioactive source according to claim 1, characterized in that: The shell cleaning table (1) is divided into a cleaning table body (1-1) and a cleaning table back plate (1-2); a cover shell (1-3) is hingedly provided on the top of the cleaning table back plate (1-2); the cleaning table body (1-1) is provided with a cleaning air duct (6) corresponding to the cleaning area; the cleaning air duct (6) is arranged below the cleaning area.

7. The device for cleaning contaminants on the surface of the inner and outer shells of a radioactive source according to claim 2, characterized in that: The circumferential drive assembly (4) comprises a circumferential drive motor; one of the rotating shafts (2-2) is connected to the output shaft of the circumferential drive motor; and mutually meshing gears (2-5) are respectively arranged on the two rotating shafts (2-2).

8. The device for cleaning contaminants on the surface of the inner and outer shells of a radioactive source according to claim 3, characterized in that: The displacement drive assembly (5) comprises a displacement drive motor and a first transmission connecting rod (5-1); the first transmission connecting rod (5-1) is rotatably connected to the back plate (1-2) of the washing table and can be rotated under the drive of the displacement drive motor; a first bevel gear (5-2) is fixed to the end of the first transmission connecting rod (5-1); and a second bevel gear (5-3) matched with the first bevel gear (5-2) is fixed to the end of the threaded rod (3-3).

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