A device for removing target contamination and sampling

Abstract

The present invention belongs to the technical field of radioactive target decontamination, and particularly relates to a target contamination removal and sampling device for decontaminating and sampling a radioactive target (4) inside a glove box. The device includes a clamping mechanism and a wiping mechanism mounted on a rectangular system chassis (1). The clamping mechanism is used to fix the cylindrical target (4), and the wiping mechanism is used to wipe the target (4). In the decontamination and sampling operations of the target, the present invention reduces the finger tip dose and the whole body external irradiation dose of the operator, improves the decontamination effect, and simplifies the operation.

Description

Technical Field

[0001] The invention belongs to the technical field of radioactive target decontamination, and in particular relates to a target contamination removal and sampling device. Background Art

[0002] Radioactive target decontamination methods can be broadly categorized into wet and dry methods. Dry methods primarily utilize mechanical principles to remove radioactive contamination, while wet methods utilize the mechanical action of a liquid medium or the physical and chemical interactions between the liquid medium and the radioactive contaminant. Decontamination methods can also be categorized as mechanical, chemical, and electrochemical.

[0003] The requirements for selecting a decontamination method should be:

[0004] 1) It can effectively remove radioactive contamination so that the residual radioactive activity on the surface does not exceed the specified value;

[0005] 2) Little corrosion and damage to the decontaminated surface;

[0006] 3) The radioactive waste generated is as small as possible;

[0007] 4) Economy and security.

[0008] According to the personnel dose limit and the requirements for preventing the spread of contamination, it is necessary to complete the removal of non-fixed contamination of the target and sampling analysis in the glove box. Only after meeting the decontamination standards can the glove box be taken out to carry out subsequent operations. Summary of the Invention

[0009] The purpose of the present invention is to provide a device that can reduce the operator's fingertip dose and whole-body external radiation dose during the decontamination and sampling operations of the target in the glove box, and solve the problems of complexity and inconvenience in inspection and maintenance of the full-automatic sampling device.

[0010] To achieve the above objectives, the technical solution adopted by the present invention is a target contamination removal and sampling device, which is used to perform decontamination and sampling operations on radioactive targets in a glove box, wherein the device includes a clamping mechanism and a wiping mechanism installed on a rectangular system chassis, wherein the clamping mechanism is used to fix the cylindrical target, and the wiping mechanism is used to wipe the target.

[0011] Furthermore, the clamping mechanism includes a first drive motor, an adjustable center frame and a tail point frame arranged in sequence along the system base frame, a three-jaw chuck is provided on the first drive motor, a clamping sleeve is provided on the three-jaw chuck, and the first drive motor is arranged at the top of the system base frame. The first drive motor is used to drive the target on the clamping mechanism to rotate around the axis.

[0012] further,

[0013] It further includes a first center point and a second center point, and the target part is clamped on the clamping mechanism by the first center point and the second center point;

[0014] The first center point is arranged on the three-jaw chuck and is used to clamp the top end of the target part;

[0015] The second center point is arranged on the tailstock and is used to clamp the tail end of the target part.

[0016] Furthermore,

[0017] The clamping sleeve is used to fix the top end of the target part on the three-jaw chuck;

[0018] The adjustable steady rest is used to support the target part when wiping the inner hole of the target part. A steady rest inner ring is arranged on the adjustable steady rest, and three supporting wheels are arranged inside the steady rest inner ring. The supporting wheels are used to support the target part and reduce friction when the target part rotates;

[0019] An adjusting handle is arranged on the adjustable steady rest and is used to adjust the three supporting wheels to contact the outer surface of the target part simultaneously;

[0020] When wiping the outer surface of the target part, the adjustable steady rest can also be deflected to avoid interfering with the wiping mechanism to wipe the outer surface of the target part.

[0021] Furthermore, the wiping mechanism includes a support plate arranged on the system chassis, a moving lead screw arranged on the support plate, a wiping head arranged at the top end of the moving lead screw. The wiping head is close to the tailstock, and it further includes a second driving motor for driving the moving lead screw to move; a wiping paper is arranged on the wiping head. The thickness of the wiping paper is 3 to 4 mm, and the width is not greater than 23 mm. The wiping paper is wound around the body of the wiping head.

[0022] Furthermore, the support plate is arranged on the system chassis through a first moving guide rail. The support plate can move along the first moving guide rail, and the moving direction is parallel to the radial direction of the target part; an adjusting handwheel is arranged on the support plate, and the movement of the support plate on the first moving guide rail is realized through the adjusting handwheel.

[0023] Furthermore, a second moving guide rail is arranged on the support plate. The moving lead screw is arranged on the support plate through the second moving guide rail. The moving lead screw can move along the second moving guide rail under the drive of the second driving motor, and the moving direction is parallel to the axial direction of the target part.

[0024] Furthermore, the system chassis adopts a foldable design, which is convenient for entering and exiting the glove box.

[0025] Furthermore, the boundary dimensions of the system chassis are 2515 mm in length and 300 mm in width.

[0026] The beneficial effects of the present invention are that, in the decontamination and sampling operations on the target, the fingertip dose and the whole-body external irradiation dose of the operator are reduced, the decontamination effect is increased, and the operation is simplified. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of a target contamination removal and sampling device according to a specific embodiment of the present invention;

[0028] In the figure: 1-system base, 2-first drive motor, 3-clamping sleeve, 4-target, 5-adjustable center frame, 6-adjustment handle, 7-tail center frame, 8-wiping head, 9-second drive motor, 10-first movable guide rail, 11-support plate, 12-second movable guide rail, 13-adjustment handwheel, 14-moving screw, 15-center frame inner ring. DETAILED DESCRIPTION

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

[0030] The present invention provides a target contamination removal and sampling device (see Figure 1 ), which is used for decontamination and sampling operations on radioactive targets 4 in a glove box, and includes a clamping mechanism and a wiping mechanism installed on a rectangular system chassis 1. The clamping mechanism is used to fix the cylindrical target 4, and the wiping mechanism is used to wipe the target 4.

[0031] The clamping mechanism includes a first drive motor 2, an adjustable center frame 5 and a tail point center frame 7 which are arranged in sequence along the system base frame 1. A three-jaw chuck is provided on the first drive motor 2, and a clamping sleeve 3 is provided on the three-jaw chuck. The first drive motor 2 is arranged at the top of the system base frame 1. The first drive motor 2 is used to drive the target 4 on the clamping mechanism to rotate around the axis (the axis of the target 4).

[0032] It also includes a first top and a second top, and the target 4 is clamped on the clamping mechanism by the first top and the second top;

[0033] The first tip is set on the three-jaw chuck to clamp the top of the target 4;

[0034] The second tip is set on the tail tip holder 7 to clamp the tail end of the target 4 (the target 4 has two specifications, with inner diameters of 26mm and 47mm respectively. The corresponding first tip and second tip also have two specifications to adapt to targets 4 of different specifications).

[0035] The clamping sleeve 3 is used to fix the top end of the target part 4 on the three-jaw chuck (the clamping sleeve 3 also has two specifications to adapt to different specifications of the target part 4);

[0036] The adjustable steady rest 5 is used to support the target part 4 when wiping the inner hole of the target part 4. There is a steady rest inner ring 15 on the adjustable steady rest 5, and there are three supporting wheels in the steady rest inner ring 15. The supporting wheels are used to support the target part 4 and reduce friction when the target part 4 rotates;

[0037] The adjustable steady rest 5 is provided with an adjusting handle 6 for adjusting the three supporting wheels to contact the outer surface of the target part 4 simultaneously;

[0038] When wiping the outer surface of the target part 4, the adjustable steady rest 5 can also be deflected (deflected by 90 degrees) to avoid interfering with the wiping mechanism to wipe the outer surface of the target part 4.

[0039] The wiping mechanism includes a support plate 11 arranged on the system chassis 1, a moving lead screw 14 arranged on the support plate 11, a wiping head 8 arranged at the top end of the moving lead screw 14. The wiping head 8 is close to the tail center rest 7, and also includes a second driving motor 9 for driving the moving lead screw 14 to move; A wiping paper is arranged on the wiping head 8. The thickness of the wiping paper is 3 to 4 mm and the width is not more than 23 mm. The wiping paper is wound around the body of the wiping head 8. By pressing the wiping paper pressing plate and locking the locking buckle of the wiping paper pressing plate, the wiping paper is installed in place.

[0040] The support plate 11 is arranged on the system chassis 1 through the first moving guide rail 10. The support plate 11 can move along the first moving guide rail 10, and the moving direction is parallel to the radial direction of the target part 4 (the target part 4 is arranged on the clamping mechanism); The support plate 11 is provided with an adjusting handwheel 13, and the movement of the support plate 11 on the first moving guide rail 10 is realized through the adjusting handwheel 13.

[0041] A second moving guide rail 12 is arranged on the support plate 11. The moving lead screw 14 is arranged on the support plate 11 through the second moving guide rail 12. The moving lead screw 14 can move along the second moving guide rail 12 under the drive of the second driving motor 9, and the moving direction is parallel to the axial direction of the target part 4 (the target part 4 is arranged on the clamping mechanism).

[0042] The system chassis 1 adopts a foldable design, which is convenient for entering and exiting the glove box. Before manually folding the system chassis 1, it is necessary to confirm that the target part 4 is not clamped on the clamping mechanism.

[0043] The boundary dimensions of the system chassis 1 are 2515 mm in length and 300 mm in width, which is convenient for installation in the narrow space of the glove box.

[0044] Finally, the specific application of the present invention is described:

[0045] When wiping the outer surface of the target 4, a double-top clamping method is used, with the first and second tops clamped by the three-jaw chuck and the tail top holder 7, respectively. After the target 4 is fully in contact with the first top, the second top is manually adjusted so that the second top is in full contact with the inner hole of the target 4, and the clamping is complete. At this point, the outer cylindrical surface of the target 4 is completely exposed, and the first drive motor 2 is turned on. The support plate 11 is then manually adjusted by adjusting the hand wheel 13 so that the wiping paper clamped on the wiping head 8 is in full contact with the outer cylindrical surface of the target 4. The second drive motor 9 can then be turned on for automatic wiping. When wiping the outer cylindrical surface of the target 4, the target 4 should rotate so that the direction of movement relative to the wiping paper is opposite to the direction of gravity, so as to provide friction opposite to the direction of gravity for the wiping head 8 and the moving screw 14, thereby offsetting the deformation of the screw caused by gravity.

[0046] When wiping the inner hole of the target 4, first adjust the adjustable center frame 5 to the working position and lock it with a locking pin. The target 4 passes through the inner ring 15 of the center frame, and the end close to the three-jaw chuck (the top of the target 4) is first inserted into the clamping sleeve 3. After that, the clamping sleeve 3 is clamped to the three-jaw chuck and locked. Use the "cross"-shaped adjustment handle 6 to adjust the support rollers in the inner ring 15 of the center frame so that the three support rollers touch the outer surface of the target 4 at the same time. After that, turn on the first drive motor 2 and adjust the speed to the required speed. Turn on the second drive motor 9, and when the wiping head 8 approaches the tail end face of the target 4, pause the movement of the wiping head 8. While visually observing, manually adjust the adjustment handwheel 13 to ensure that the wiping paper contacts the inner surface of the target 4, then start the second drive motor 9 and adjust the speed to start wiping the inner wall of the target 4.

[0047] Regardless of whether the inner or outer surface of the target 4 is wiped, when the wiping is completed and the wiping head 8 needs to be retracted, it is necessary to ensure that the wiping paper is out of contact with the surface of the target 4. Then, the moving screw 14 is operated in the reverse direction to retract the wiping head 8 to the set position.

[0048] The adjustable center stand 5 provides external support when wiping and decontaminating the target's inner diameter. The distance between the support rollers can be adjusted by adjusting the handle 6 according to the target's outer diameter. When wiping the target's outer surface 4, the adjustable center stand 5 can be deflected 90°, fully exposing the target's outer surface for easier wiping. The adjustable center stand 5 should be locked in place with a locating pin in both the deflected and working positions to prevent displacement due to external forces, which could affect target wiping or other operations.

[0049] The user can decide the order of wiping the inner and outer surfaces of the target 4 according to usage requirements. However, in order to avoid cross-contamination of the inner and outer surfaces by the fixture during the wiping process, it is recommended to wipe the inner surfaces of targets of different specifications together, and then wipe the outer surfaces together after passing the inspection.

[0050] The device described in the present invention is not limited to the embodiments described in the specific embodiments. Those skilled in the art can obtain other embodiments based on the technical solutions of the present invention, which also fall within the scope of the technical innovation of the present invention.

Claims

1. A target contamination removal and sampling device for performing decontamination and sampling operations on a radioactive target (4) in a glove box, characterized by: It comprises a clamping mechanism and a wiping mechanism installed on a rectangular system chassis (1), wherein the clamping mechanism is used to fix the cylindrical target (4), and the wiping mechanism is used to wipe the target (4); The clamping mechanism comprises a first drive motor (2), an adjustable center frame (5) and a tail center frame (7) sequentially arranged along the system base frame (1); a three-jaw chuck is provided on the first drive motor (2); a clamping sleeve (3) is provided on the three-jaw chuck; the first drive motor (2) is arranged at the top end of the system base frame (1); the first drive motor (2) is used to drive the target (4) on the clamping mechanism to rotate around an axis; It also includes a first top and a second top, and the target (4) is clamped on the clamping mechanism by the first top and the second top; The first tip is arranged on the three-jaw chuck and is used to clamp the top of the target (4); The second tip is arranged on the tail tip holder (7) and is used to clamp the tail end of the target (4); The clamping sleeve (3) is used to fix the top end of the target (4) on the three-jaw chuck; The adjustable center frame (5) is used to support the target (4) when wiping the inner hole of the target (4). The adjustable center frame (5) is provided with a center frame inner ring (15). Three supporting wheels are provided inside the center frame inner ring (15). The supporting wheels are used to support the target (4) and reduce friction when the target (4) rotates. The adjustable center frame (5) is provided with an adjustment handle (6) for adjusting the three supporting wheels to contact the outer surface of the target (4) at the same time; When wiping the outer surface of the target (4), the adjustable center frame (5) can also be deflected to avoid obstructing the wiping mechanism from wiping the outer surface of the target (4).

2. The target contamination removal and sampling device according to claim 1, characterized in that: The wiping mechanism comprises a support plate (11) arranged on the system chassis (1), a movable lead screw (14) arranged on the support plate (11), a wiping head (8) arranged at the top end of the movable lead screw (14), the wiping head (8) being close to the tail top frame (7), and further comprising a second drive motor (9) for driving the movable lead screw (14) to move; a wiping paper is arranged on the wiping head (8), the wiping paper has a thickness of 3 to 4 mm and a width of not more than 23 mm, and the wiping paper is wound around the body of the wiping head (8).

3. The target contamination removal and sampling device according to claim 2, characterized in that: The support plate (11) is arranged on the system base frame (1) via a first movable guide rail (10), and the support plate (11) can move along the first movable guide rail (10), and the moving direction is parallel to the radial direction of the target (4); an adjusting hand wheel (13) is provided on the support plate (11), and the movement of the support plate (11) on the first movable guide rail (10) is achieved by the adjusting hand wheel (13).

4. A target contamination removal and sampling device as claimed in claim 3, characterized in that: A second movable guide rail (12) is provided on the support plate (11), and the movable lead screw (14) is arranged on the support plate (11) via the second movable guide rail (12). The movable lead screw (14) can move along the second movable guide rail (12) under the drive of the second drive motor (9), and the moving direction is parallel to the axial direction of the target (4).

5. The target contamination removal and sampling device according to claim 4, characterized in that: The system chassis (1) adopts a foldable design, which facilitates entry and exit of the glove box.

6. The target contamination removal and sampling device according to claim 5, characterized in that: The boundary dimensions of the system chassis (1) are 2515 mm in length and 300 mm in width.

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