Radiation-resistant camera lightweight device and use method thereof

Abstract

The invention discloses an irradiation-resistant camera lightweight device and a use method thereof. The irradiation-resistant camera lightweight device comprises a protective cover plate, a shielding shell assembly, a bracket and a sealing assembly, the camera is placed in the shielding shell assembly, the support supports the shielding shell assembly, and the protection cover plate shields the shielding shell assembly. On the premise of meeting the environmental requirements of sealing, shielding and isolation, the use cost is reduced, the mass and the size are reduced, the production process requirements can be met by quickly replacing the camera, and meanwhile, the packaging plot ratio of radioactive solid waste can be increased.

Description

Technical Field

[0001] This invention relates to the field of spent fuel technology, and more specifically to a device and method for lightweighting a radiation-resistant camera. Background Art

[0002] At present, the nuclear fuel reprocessing process based on the "cut-off-leaching" method is mainly used for power reactor spent fuel. The spent fuel cut-off process usually uses mechanical methods to expose the fuel core. This process will produce a large amount of aerosols and high-temperature dust with a high level of radioactivity. Therefore, the cut-off process is carried out in a shielded, sealed, ventilated and isolated environment, and is equipped with special cameras to observe the spent fuel cut-off operation process to ensure that all links of the cut-off process meet the operation requirements.

[0003] The cameras currently used in the cutting process are integrated cameras with high radiation resistance and good sealing, in order to achieve a long service life. However, in actual application, they have the following disadvantages: high cost but short service life, large mass and volume, inconvenient for long-distance replacement, and low packaging volume ratio of the highly radioactive solid waste generated. Summary of the invention

[0004] The purpose of the present invention is to provide a method and device for lightweighting cameras in highly radioactive places. It can reduce the use cost, weight and volume under the premise of meeting the requirements of sealing, shielding and isolation environment, and can meet the production process requirements through the rapid replacement of cameras, while at the same time increasing the packaging volume ratio of radioactive solid waste.

[0005] The technical solution of the present invention is as follows: a radiation-resistant camera lightweight device, comprising a protective cover, a shielding shell assembly, a bracket, and a sealing assembly; the camera is placed in the shielding shell assembly, the bracket supports the shielding shell assembly, and the protective cover shields the shielding shell assembly;

[0006] The protective cover plate includes a rotating arm, an operating bracelet, a cover plate, a pressure plate, and an adjusting nut; an operating bracelet is welded on the surface of the rotating arm, and one side of the rotating arm is welded to the cover plate; an oblique triangular boss is provided on the outer side of the cover plate; a positioning hole is provided on the cover plate, and the cover plate is fastened to the pressure plate through an adjusting nut;

[0007] The shielding shell assembly includes a shielding shell and a positioner, and the positioner is placed inside the shielding shell; the shielding shell includes a baffle, a shell, a clamping block, and a wheel assembly. The clamping block is welded to the center of the outer side of the baffle, and the shell is welded to the inner side. The wheel assembly is assembled at the bottom of the shell, and a groove is opened on the front side of the shell to assemble the observation glass; the positioner includes a front fixing plate, a limit track, an adjustment plate, a compression spring, and a rear fixing plate. The outer side of the front fixing plate is welded to the limit track, and the other side of the limit track is welded to the rear fixing plate. A positioning shaft is welded to the center of the inner side of the fixing plate to fix the compression spring. One end of the compression spring is assembled on the adjustment plate, and the camera is placed between the front fixing plate and the adjustment plate;

[0008] The bracket includes an outer frame, side plates, a bottom plate, an adjustment plate, and a support beam. The outer side of the outer frame is welded to the side plates and the bottom, and the adjustment plates are welded to both ends of the support beam.

[0009] The sealing assembly includes an axle, a pressure wheel, a handle, a pin, and a gasket. The axle is assembled with the pressure wheel through the through hole of the pressure wheel, and the end of the axle is connected to the handle and fixed by a pin. Gaskets are installed on both sides of the axle.

[0010] Two oblique triangular bosses are arranged on the outer side of the cover plate, which are symmetrical along the center; and a positioning hole is arranged on each of the upper and lower sides of the cover plate, which are symmetrical along the center.

[0011] A U-groove is formed on the top of the baffle plate, and two oblique triangular bosses are formed on the outer side of the U-groove, symmetrically along the center.

[0012] The observation glass is radiation-resistant and high-temperature-resistant glass.

[0013] The front fixing plate is used to determine the position of the camera lens.

[0014] One end of the compression spring is assembled on the circular boss outside the adjusting plate, and the adjusting plate moves back and forth along the limiting track.

[0015] The bottom plate is provided with a concave groove, so that the wheel assembly moves along the predetermined groove.

[0016] The sealing assembly cooperates with the outside of the cover plate or the baffle plate.

[0017] A method for using a radiation-resistant camera lightweight device,

[0018] When the camera is needed for observation, the operating bracelet is clamped and rotated, and the protective cover is rotated to the open limit position; then, the clamping block on the shielding shell assembly is clamped to push the camera shielding block assembly forward to the inner wall of the baffle, and then the handle is rotated to complete the sealing of the camera in the working state;

[0019] When there is no need to observe through the camera, operate the manipulator to rotate the handle away from the baffle, then operate the clamping block to pull the shielding shell assembly to the maximum rearward position of the wheel assembly, and then clamp the operating bracelet to rotate the protective cover back to a certain angle to block the observation. At this time, rotate the handle to act on the triangular boss of the cover to complete the sealing of the camera when it is not working.

[0020] A method for repairing and replacing a lightweight device of a radiation-resistant camera. When an observation glass loaded on the front end of a shielding shell assembly is damaged, the damaged observation glass on the shielding shell assembly is clamped by a manipulator and placed in a high-level radioactive waste barrel while the protective cover is in a shielding protection state, and a new observation glass is placed in its original position; when the camera reaches the end of its service life, the manipulator is operated to clamp out the camera together with a locator while the protective cover is in a shielding protection state, and the locator is selectively used or the compression spring is replaced in combination with the new camera shape and size, and the camera is put back into the shielding shell; when the shielding shell is stuck during operation, the shielding shell assembly is clamped out as a whole, and the wheel assembly is replaced by the manipulator; when the protective cover does not meet the use requirements, the manipulator is operated to repair or replace the protective cover as a whole.

[0021] The significant effect of the present invention is that when there is no need for observation, the protective cover can achieve the environmental requirements of relative sealing, shielding and isolation of the spent fuel treatment process, reducing the time the camera is exposed to a high-radioactive environment, thereby extending the overall service life of the device;

[0022] The coordination between the camera and the protective cover, sealing gasket, shielding shell, bracket and lens reduces the requirements for radiation resistance and sealing of the camera itself, thereby reducing the mass and volume of the camera itself. By operating the manipulator to replace different parts remotely, the high-value, high-quality, large-volume, difficult-to-disassemble and replace special devices are converted into low-value, light-weight, small-volume, quickly replaceable common devices, which can then be replaced according to the service life of each component, reducing the overall manufacturing and processing difficulty and use cost of the camera; at the same time, the volume of high-level radioactive solid waste generated is reduced, and in the absence of other disassembly and other treatments, the barrel volume ratio of high-level radioactive solid waste is significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1-1 Schematic diagram of the structure of the present invention

[0024] Figure 1-2 Schematic diagram of the overall structure of the present invention

[0025] Figure 2-1 Schematic diagram of the protective cover;

[0026] Figure 2-2 Schematic diagram of the protective cover;

[0027] Figure 3-1 is a schematic diagram of a shielding shell;

[0028] Figure 3-2 is a schematic diagram of a shielding shell;

[0029] Figure 4 Schematic diagram of camera locator

[0030] Figure 5-1 is a schematic diagram of the structure of the bracket;

[0031] Figure 5-2 Schematic diagram of the support beam;

[0032] Figure 6 Schematic diagram of the sealing component

[0033] Marks and corresponding parts names in the attached drawings:

[0034] In the figure: 1 protective cover, 2 shielding shell assembly, 3 bracket, 4 sealing assembly, 5 rotating arm, 6 operating bracelet, 7 cover, 8 pressure plate, 9 adjusting nut, 10 baffle, 11 shell, 12 clamping block, 13 wheel assembly, 14 front fixing plate, 15 limiting track, 16 adjustment plate, 17 compression spring, 18 rear fixing plate, 19 outer frame, 20 side plate, 21 bottom plate, 22 adjustment plate, 23 support beam, 24 wheel axle, 25 pressure wheel, 26 handle, 27 pin, 28 gasket, 30 observation channel. DETAILED DESCRIPTION

[0035] Many specific details are described in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present application, so the present application is not limited by the specific implementation disclosed below.

[0036] The terms used in one or more embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit one or more embodiments of the present application. The singular forms of "a", "said" and "the" used in one or more embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in one or more embodiments of the present application refers to and includes any or all possible combinations of one or more associated listed items.

[0037] It should be understood that, although the terms first, second, etc. may be used to describe various information in one or more embodiments of the present application, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of one or more embodiments of the present application, the first may also be referred to as the second, and similarly, the second may also be referred to as the first.

[0038] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0039] The present invention provides a radiation-resistant camera lightweight device. According to an embodiment of the present invention, referring to Figure 1-1 , Figure 1-2 , including a protective cover 1, a shielding shell assembly 2, a bracket 3, and a sealing assembly 4; the camera is placed in the shielding shell assembly 2, the bracket 3 supports and enables the shielding shell assembly 2 loaded with the camera to move back and forth along the axial direction of the observation channel 30, and the protective cover 1 can block the observation channel 30; the protective cover 1 and the shielding shell assembly 2 can both act on the observation channel 30 to seal and isolate, so as to prevent the radioactive atmosphere generated by the cutting process from escaping from the observation channel 30; wherein the protective cover 1 rotates circumferentially along the observation channel 30, and the shielding shell assembly 2 rotates along the bracket 3 along the observation channel 30. The observation channel 30 moves axially and horizontally, and the protective cover 1 and the shielding shell assembly 2 are in a complementary relationship, that is, when the protective cover 1 is located in front of the observation channel 30 (sealed position), the shielding shell is in the maximum retreat position (the position where the whole is completely away from the shielding boundary); if the protective cover 1 is on the stopper (unscrewed state), the shielding shell is in the forward sealing position (the inner side of the baffle 10 is in contact with the outer side of the shielding boundary), and both are pressed and sealed by the pressure wheel 25 on the sealing assembly 4 and the oblique triangular boss thereon, so that the spent fuel cutting process is in a relatively sealed and isolated environment.

[0040] According to an embodiment of the present invention, Figure 2-1 and Figure 2-2 As shown, the protective cover 1 includes a rotating arm 5, an operating bracelet 6, a cover 7, a pressure plate 8, and an adjusting nut 9; one end of the rotating arm 5 is hinged to the upper fixed point of the observation channel 30 at the shielding boundary, and an operating bracelet 6 is welded on its upper surface so that it can be manipulated by a robot, and the other side is welded to the cover 7; two oblique triangular bosses are provided on the outer side of the cover 7, which are symmetrical along the center; there is a positioning hole on the upper and lower sides of the cover 7, which is symmetrical about the center and assembled with the pressure plate 8, and is used to position the sealing gasket installed on the inner side of the cover 7, and at the same time, it can be adjusted and tightened by adjusting the nut 9 according to the thickness of the sealing gasket.

[0041] like Figure 3-1 and Figure 3-2 As shown, the shielding shell assembly 2 includes a shielding shell for shielding protection and a positioner ( Figure 4As shown); the shielding shell includes a baffle 10, a shell 11, a clamping block 12, and a wheel assembly 13. A U-groove is opened on the top of the baffle 10 for placing the cable connected to the camera. The outer side thereof is similar to the outer side of the cover plate 7, and is provided with two oblique triangular bosses, which are symmetrical along the center. A clamping block 12 is welded at the center of the outer side for clamping and manipulation by a robot. The shell 11 is welded on the inner side, and the bottoms of the two are in the same plane. Four concave grooves are opened at the bottom of the shell 11 for assembling the wheel assembly 13 to reduce the running resistance of the shielding shell assembly. A groove is opened on the front side of the shell 11 for assembling observation glass (such as radiation-resistant glass, high-temperature-resistant glass, etc.). The positioner includes a front fixing plate 14, a limiting rail 15, an adjusting plate 16, a compression spring 17, and a rear fixing plate 18. The positioner is placed inside the shielding shell, and its size depends on the size of the shielding shell. The front fixing plate 14 is used to determine the position of the camera lens. Its outer side is welded to the three limiting rails 15, and the other side of the limiting rail 15 is welded to the rear fixing plate 18. A positioning shaft is welded at the center of the inner side of the fixing plate 18 to fix the compression spring 17. The other end of the compression spring 17 is assembled on the circular boss on the outer side of the adjusting plate 16. The adjusting plate 16 can move back and forth along the limiting rail 15. The camera is placed between the front fixing plate 14 and the adjusting plate 16. The compression spring 17 indirectly acts on the camera by applying a certain spring force to the adjusting plate 16, thereby achieving the purpose of fixing cameras of different sizes. The cables connected to the camera can be led out through the U-shaped grooves on the adjusting plate 16 and the rear fixing plate 18.

[0042] The bracket 3 is used to support and enable the shielding shell assembly 2 loaded with the camera to move back and forth along the axial direction of the observation channel 30. The bracket 3 includes an outer frame 19, a side plate 20, a bottom plate 21, an adjustment plate 22, and a support beam 23. The outer frame 19 is installed on the inner side of the observation channel 30, that is, the side where the cutting process occurs; when the shielding shell assembly 2 moves forward to the right position, its front end plane contacts the outer side of the outer frame 19 close to the observation operation side, and the outer side of the outer shell 19 close to the observation operation side is welded to the side plate 20 and the bottom 21. The bottom plate 21 is provided with a concave groove, so that the wheel assembly 13 can move along the predetermined groove track, and the two sides of the support beam 23 are connected. The end of the side plate 20 is welded with an adjustment plate 22, which is respectively connected to the lower outer surface of the observation channel 30 on the bottom plate 21 and the shielding boundary by threads to ensure that the outer frame 19 is in close contact with the inner surface of the shielding boundary near the cutting process, and at the same time ensure that the bottom plate 21 is in a horizontal state. The outer surfaces of the side plate 20 and the bottom plate 21 are tightly fitted to the inner side of the observation channel 30, and grooves are opened thereon to avoid interference with the rotation movement of the protective cover. The U-groove depth of the bottom plate 21 is also affected by the bottom position of the observation channel 30, that is, the bottom surface of the U-groove should be lower than the observation channel 30, so as to ensure that the protective cover can completely cover the observation channel 30.

[0043] The sealing component 4 cooperates with the two oblique triangular bosses on the outside of the cover plate 7 or the baffle plate 10 to form a relatively sealed and isolated environment for the observation channel 30. The sealing component 4 includes an axle 24, a pressure wheel 25, a handle 26, a pin 27, and a gasket 28. The axle 24 is hinged on both sides of the observation channel 30 and is assembled with the pressure wheel 25 through the through hole of the pressure wheel 25. The end is connected to the handle 26 and fixed by the pin 27. The axle 24 is rotated by operating the handle 26, so that the pressure wheel 25 acts on the triangular boss of the cover plate 7 or the baffle plate 10 to generate axial force, thereby playing a compression and sealing role.

[0044] Workflow: When the spent fuel assembly is in the "cut-off" process and a camera is needed to observe the internal processing situation, the manipulator is operated to clamp the operating bracelet 6 to rotate the protective cover 1 completely away from the observation channel 30, that is, the instantaneous clockwise rotation angle is greater than 180 degrees. At this time, the protective cover 1 will be rotated to the open limit position under the action of gravity; then, the manipulator is operated to clamp the clamping block 12 on the shielding shell assembly 2, and the shielding block assembly 2 loaded with the camera is pushed forward until the inner wall of the baffle 10 is in contact with the outer wall of the observation channel 30, and then the manipulator is operated to rotate the handle 26 to act on the triangular boss of the baffle 10 to complete the sealing of the camera in the working state; when When it is in the non-cutting process or there is no need to observe through the camera, the manipulator is operated to rotate the handle 26 to leave the triangular boss on the baffle, and then the manipulator operates the clamping block 12 to pull the shielding shell assembly 2 loaded with the camera to the maximum rearward position of the wheel assembly, that is, at this time the shielding shell assembly completely leaves the observation channel 30 on the shielding boundary, and then the manipulator clamps the operating bracelet 6 to rotate the protective cover 2 back to a certain angle. At this time, under the action of gravity, the protective cover 2 will naturally rotate to just above the observation channel 30. At this time, the manipulator is operated to rotate the handle 26 to act on the triangular boss of the cover 7 to complete the sealing of the camera when it is not working.

[0045] Instructions for use and replacement: In combination with the characteristics of the camera's own lens and the environmental characteristics of the spent fuel assembly cutting process, when the radiation-resistant glass or high-temperature-resistant special lens loaded at the front end of the shielding shell assembly 2 is physically damaged, when the protective cover 1 is in the shielding protection state, the old glass lens on the shielding shell assembly 2 is clamped by the manipulator and placed in the high-level radioactive waste barrel, and the new special lens is placed in the card slot of the shielding shell assembly 2; when the camera reaches the end of its service life, when the protective cover 1 is in the shielding protection state, the manipulator is operated to clamp the camera together with the locator, and then the manipulator is operated to remove the camera to be replaced from the locator, and the locator is selectively used or the compression spring 17 is replaced according to the shape and size of the new camera, and then the camera is put back into the shielding shell; when the shielding shell is stuck during operation and the wheel assembly 13 needs to be replaced, the shielding shell assembly 2 can be clamped out as a whole, and the wheel axle assembly can be replaced by the manipulator; when the protective cover 1 does not meet the use requirements, the manipulator can be operated to replace the sealing gasket on the protective cover 1 or replace it as a whole when the shielding shell assembly is in the shielding protection working state.

[0046] The above description is only a preferred embodiment of this patent and is not intended to limit this patent. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this patent should be included in the scope of protection of this patent.

[0047] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described action sequence, because according to the present application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0048] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0049] The preferred embodiments of the present application disclosed above are only used to help explain the present application. The optional embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of the present application. The present application selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can understand and use the present application well.

Claims

1. A radiation-resistant camera lightweight device, characterized in that: It comprises a protective cover plate (1), a shielding shell assembly (2), a bracket (3), and a sealing assembly (4); the camera is placed in the shielding shell assembly (2), the bracket (3) supports the shielding shell assembly (2), and the protective cover plate (1) shields the shielding shell assembly (2); The protective cover plate (1) comprises a rotating arm (5), an operating bracelet (6), a cover plate (7), a pressure plate (8), and an adjusting nut (9); the surface of the rotating arm (5) is welded with the operating bracelet (6), and one side of the rotating arm (5) is welded to the cover plate (7); an oblique triangular boss is provided on the outer side of the cover plate (7); a positioning hole is provided on the cover plate (7), and the cover plate (7) is fastened to the pressure plate (8) by means of the adjusting nut (9); The shielding shell assembly (2) comprises a shielding shell and a positioner, and the positioner is placed inside the shielding shell; the shielding shell comprises a baffle (10), a shell (11), a clamping block (12), and a wheel assembly (13); the clamping block (12) is welded at the center of the outer side of the baffle (10), and the shell (11) is welded on the inner side; the wheel assembly (13) is assembled at the bottom of the shell (11); a groove is opened on the front side of the shell (11) and an observation glass is assembled; the positioner comprises a front fixing plate (14), a limiting track (15), an adjusting plate (16), a compression spring (17), and a rear fixing plate (18); the outer side of the front fixing plate (14) is welded to the limiting track (15), and the other side of the limiting track (15) is welded to the rear fixing plate (18); a positioning shaft is welded at the center of the inner side of the fixing plate (18) for fixing the compression spring (17); one end of the compression spring (17) is assembled on the adjusting plate (16), and the camera is placed between the front fixing plate (14) and the adjusting plate (16); The bracket (3) comprises an outer frame (19), a side plate (20), a bottom plate (21), an adjustment plate (22), and a support beam (23); the outer side of the outer frame (19) is welded to the side plate (20) and the bottom (21); and the adjustment plates (22) are welded to both ends of the support beam (23); The sealing assembly (4) comprises a wheel axle (24), a pressure wheel (25), a handle (26), a pin (27), and a gasket (28). The wheel axle (24) is assembled with the pressure wheel (25) through a through hole of the pressure wheel (25), and the end of the wheel axle (24) is connected with the handle (26) and fixed by the pin (27). Gaskets (28) are installed on both sides of the wheel axle (24).

2. A radiation-resistant camera lightweight device according to claim 1, characterized in that: The outer side of the cover plate (7) is provided with two oblique triangular bosses, which are symmetrical along the center; the upper and lower sides of the cover plate (7) each have a positioning hole, which is symmetrical along the center.

3. The radiation-resistant camera lightweight device according to claim 1, characterized in that: The baffle (10) has a U-groove on the top, and two oblique triangular bosses are arranged on the outside thereof, symmetrically along the center.

4. The radiation-resistant camera lightweight device according to claim 1, characterized in that: The observation glass is radiation-resistant and high-temperature-resistant glass.

5. The radiation-resistant camera lightweight device according to claim 1, characterized in that: The front fixing plate (14) is used to determine the position of the camera lens.

6. The radiation-resistant camera lightweight device according to claim 1, characterized in that: One end of the compression spring (17) is mounted on the outer circular boss of the adjustment plate (16), and the adjustment plate (16) moves back and forth along the limiting track (15).

7. The radiation-resistant camera lightweight device according to claim 1, characterized in that: The bottom plate 21 is provided with a concave groove, so that the wheel assembly (13) moves along a predetermined groove.

8. The radiation-resistant camera lightweight device according to claim 1, characterized in that: The sealing assembly (4) cooperates with the outer side of the cover plate (7) or the baffle plate (10).

9. A method for using a radiation-resistant camera lightweight device, characterized in that: When the camera is required to observe, the operating bracelet (6) is clamped and rotated, and the protective cover (1) is rotated to the open limit position; then, the clamping block (12) on the shielding shell assembly (2) is clamped to push the camera shielding block assembly (2) forward to the inner wall of the baffle (10), and then the handle (26) is rotated to complete the sealing of the camera in the working state; When observation through the camera is not required, the manipulator is operated to rotate the handle (26) away from the baffle (10), and then the clamping block (12) is operated to pull the shielding shell assembly (2) to the maximum retreat position of the wheel assembly (13), and then the operating bracelet (6) is clamped to rotate the protective cover (2) back to a certain angle, thereby blocking observation. At this time, the handle (26) is rotated to act on the triangular boss of the cover (7), completing the sealing of the camera when it is not in operation.

10. A method for repairing and replacing a radiation-resistant camera lightweight device, characterized in that: When the observation glass loaded on the front end of the shielding shell assembly (2) is damaged, the damaged observation glass on the shielding shell assembly (2) is clamped and placed into a high-level radioactive waste barrel by a manipulator while the protective cover (1) is in the shielding protection state, and a new observation glass is placed in the original position; when the camera reaches the end of its service life, the manipulator is operated to clamp out the camera together with the positioner while the protective cover (1) is in the shielding protection state, and the positioner is selectively used or the compression spring (17) is replaced in combination with the shape and size of the new camera, and then placed back into the shielding shell; when the shielding shell is stuck during operation, the shielding shell assembly (2) is clamped out as a whole, and the wheel assembly (13) is replaced by the manipulator; when the protective cover (1) does not meet the use requirements, the manipulator is operated to repair or replace the protective cover (1) as a whole.

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