Shutter device for radiation protection

Abstract

The invention provides a shutter device for radiation protection, which comprises a shielding body, a light emitting diode, a photosensitive diode, a collimator and a driving and logic circuit, the collimator is provided with a hole, the shielding body goes in and out of the hole, one end of the collimator is provided with a channel for accommodating a fuel rod, and the other end of the collimator is provided with a light emitting diode. The light-emitting diode and the photosensitive diode are arranged on the channel, and the light-emitting diode and the photosensitive diode are electrically connected with the driving and logic circuit respectively. Shielding is carried out on key parts where X-rays overflow, the thickness and the area of a shielding layer do not need to be greatly increased, the high-energy X-ray tube does not need to be repeatedly switched on and off, the equipment manufacturing and transporting cost is reduced, the equipment operability is improved, and the service life of the equipment is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of manufacturing nuclear fuel elements for nuclear power plants, and in particular to a shutter device for radiation protection. Background Art

[0002] In the process of fuel rod inspection, equipment with high-energy X-ray tubes is often used to detect product quality. If the high-energy X-rays generated by them are not shielded, they will cause harm to the personnel on duty. In production practice, due to the limitations of processing technology, manufacturing costs, transportation methods and working methods, the shielding method of blindly increasing the thickness and area of ​​the shielding layer is not advisable, and frequent switching of high-energy X-ray tubes will cause damage to the equipment itself. Therefore, inventing a shielding device that can enable the equipment to work continuously is a key method to solve the above contradiction. Summary of the invention

[0003] The purpose of the present invention is to provide a shutter device for radiation protection, which solves the problems of increased equipment cost and shortened life caused by increasing the thickness and area of ​​the shielding layer or switching high-energy X-ray tubes in the prior art.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A shutter device for radiation protection comprises a shielding body, a light emitting diode, a photosensitive diode, a collimator, and a driving and logic circuit. The collimator is provided with a hole, and the shielding body enters and exits the hole. One end of the collimator is provided with a channel for accommodating a fuel rod, and the light emitting diode and the photosensitive diode are arranged on the channel. The light emitting diode and the photosensitive diode are electrically connected to the driving and logic circuit respectively.

[0006] As an implementable manner, the shielding body is connected to a transmission device, the transmission device is connected to a rotating electromagnet, and the rotating electromagnet is electrically connected to the driving and logic circuit.

[0007] As an implementable manner, the rotary electromagnet is a rotary electromagnet with a fixed rotation angle.

[0008] As an implementable manner, the light emitting diode is arranged above the channel, and the photosensitive diode is arranged below the channel.

[0009] As an practicable manner, the shielding body has a diameter of 10 mm and a height of 44 mm.

[0010] As an implementable manner, the shielding body is in the shape of a cylinder.

[0011] As an implementable manner, the material of the shielding body is lead.

[0012] As an practicable manner, the collimator has a height of 88 mm and a length of 62.71 mm.

[0013] As an implementable manner, the right end of the fuel rod is arranged between the light emitting diode and the photosensitive diode.

[0014] As an practicable manner, the depth of the hole of the collimator is 34 mm.

[0015] Compared with the prior art, the shutter device for radiation protection provided by the present invention has the following beneficial effects:

[0016] The present invention shields the key parts where X-rays overflow, without greatly increasing the thickness and area of ​​the shielding layer, and without repeatedly switching on and off the high-energy X-ray tube, thereby reducing the manufacturing and transportation costs of the equipment, improving the operability of the equipment, and extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for the technical description.

[0018] Figure 1 A schematic structural diagram of a shutter device for radiation protection provided by the present invention.

[0019] Description of reference numerals:

[0020] 1. Rotating electromagnet; 2. Shielding body; 3. Transmission device; 4. Light-emitting diode; 5. Photosensitive diode; 6. Fuel rod; 7. Collimator; 8. Driving and logic circuit. DETAILED DESCRIPTION

[0021] The following is further explained in detail through specific implementation methods.

[0022] like Figure 1 As shown, the present invention provides a shutter device for radiation protection, including a rotating electromagnet 1, a shielding body 2, a light-emitting diode 4 and a photosensitive diode 5. A fuel rod 6 is provided at one end of the collimator 7, and a hole is provided on the collimator 7. Under the driving action of the transmission device 3, the shielding body 2 is lowered into the hole or lifted out of the hole. The rotating electromagnet 1 is connected to the transmission device 3, and the transmission device 3 is connected to the shielding body 2. The rotating electromagnet 1 is electrically connected to the driving and logic circuit 8, and the driving and logic circuit 8 is electrically connected to the light-emitting diode 4 and the photosensitive diode 5. The light-emitting diode 4 and the photosensitive diode 5 are respectively arranged at the upper and lower ends of the collimator 7, and one end of the fuel rod 6 is arranged between the light-emitting diode 4 and the photosensitive diode 5.

[0023] Preferably, a channel for accommodating the end of the fuel rod 6 is opened at the left end of the collimator 7, and the light emitting diode 4 and the photosensitive diode 5 are respectively arranged at the upper and lower ends of the channel.

[0024] The shielding body 2 is made of lead alloy and has a high mass absorption coefficient, which can effectively shield X-rays. At the same time, the shielding body 2 has a certain mass (for example, about 40 grams), and can fall back to the shielding state after the rotating electromagnet 1 is powered off. During the detection process, the rotating electromagnet 1 is responsible for raising the shielding body 2 through the transmission device 3 to remove the shielding body's blocking of X-rays. After the detection is completed, the rotating electromagnet 1 is responsible for lowering the shielding body 2 to restore the shielding body 2's blocking of X-rays.

[0025] Preferably, the shielding body 2 has a diameter of 10 mm, a height of 44 mm, and a cylindrical shape.

[0026] Preferably, the material of the shielding body 2 is lead.

[0027] Preferably, in order to increase the speed of lifting and lowering the shielding body 2 and facilitate control, a rotary electromagnet with a fixed rotation angle is used to drive the shielding body 2 to lift and lower.

[0028] Preferably, in order to effectively ensure that the X-ray beam can be effectively turned on only when the fuel rod 6 is in place, and to ensure the radiation safety of the staff, in the invention, a light emitting diode 4 and a photosensitive diode 5 are used to form a detection pair (the light emitting diode 4 and the photosensitive diode 5 are a photoelectric detection pair tube) to determine whether the fuel rod 6 is in place, and to control the operation of the rotating electromagnet 1. The above control process is implemented by hardware circuits to avoid the uncertainty of software control and improve system reliability.

[0029] Based on the above design, the present invention can make the high-energy X-ray tube unnecessary to switch during the inspection of the fuel rod 6, which not only avoids damage to the equipment caused by frequent switching, but also ensures the safety of the personnel on duty. The rotating electromagnet can also ensure that in the event of abnormal power failure, the shielding body can fall to the designed position by gravity and normally block the emission of X-rays.

[0030] Preferably, the height of the collimator 7 is 88 mm and the length is 62.71 mm.

[0031] The driving and logic circuit 8 is an existing standard product, and its function is to detect whether the fuel rod 6 is in place, and when the fuel rod 6 is in place, control the rotating electromagnet 1 to be in a conducting state, so that the shielding body 2 is lifted and X-rays are emitted.

[0032] The basic principle is that the electron emission gun ionizes the anode through thermal excitation to produce electrons. After being accelerated by the electric field, the electrons bombard the target material, causing the electrons to decelerate rapidly and produce high-energy X-rays.

[0033] The workflow of the present invention is as follows:

[0034] After the instrument is powered on, the light emitting diode 4 is in working state. When the fuel rod 6 does not enter the measuring position, the photosensitive diode 5 is turned on, the rotary electromagnet 1 is in a power-off state, the shielding body 2 falls, and the X-rays are blocked.

[0035] When the fuel rod 6 enters the measuring station, the light emitted by the light emitting diode 4 is blocked, the photosensitive diode 5 is turned off, the rotary electromagnet 1 is in the on state, the shielding body 2 is lifted, and the X-rays irradiate the fuel rod breakpoint through the small hole of the collimator 7.

[0036] When the instrument is powered off, the rotary electromagnet 1 is in a power-off state, the shielding body 2 falls down, and the small hole of the collimator 7 is shielded.

[0037] The existing technology mainly achieves reliable radiation protection through two points: one is to greatly increase the thickness and area of ​​the shielding layer, and the other is to repeatedly turn on and off the high-energy X-ray tube. A large increase in the thickness and area of ​​the shielding layer will increase the manufacturing cost and transportation cost and reduce the operability of the equipment, while repeatedly turning on and off the high-energy X-ray tube will damage the high-energy X-ray tube and shorten the service life of the equipment. The shutter device for radiation protection provided by the present invention is to shield the key parts of the X-ray overflow, without greatly increasing the thickness and area of ​​the shielding layer, and without repeatedly turning on and off the high-energy X-ray tube, which reduces the manufacturing and transportation costs of the equipment, improves the operability of the equipment, and extends the service life of the equipment.

[0038] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A shutter device for radiation protection, characterized in that: The invention comprises a shielding body (2), a light-emitting diode (4), a photosensitive diode (5), a collimator (7), and a driving and logic circuit (8); the collimator (7) is provided with a hole, the shielding body (2) enters and exits the hole; one end of the collimator (7) is provided with a channel for accommodating a fuel rod (6); the light-emitting diode (4) and the photosensitive diode (5) are arranged on the channel; the light-emitting diode (4) and the photosensitive diode (5) are respectively electrically connected to the driving and logic circuit (8).

2. The shutter device for radiation protection according to claim 1, characterized in that: The shielding body (2) is connected to a transmission device (3), the transmission device (3) is connected to a rotating electromagnet (1), and the rotating electromagnet (1) is electrically connected to the driving and logic circuit (8).

3. The shutter device for radiation protection according to claim 2, characterized in that: The rotary electromagnet (1) is a rotary electromagnet with a fixed rotation angle.

4. The shutter device for radiation protection according to claim 1, characterized in that: The light emitting diode (4) is arranged above the channel, and the photosensitive diode (5) is arranged below the channel.

5. The shutter device for radiation protection according to claim 1, characterized in that: The shielding body (2) has a diameter of 10 mm and a height of 44 mm.

6. The shutter device for radiation protection according to claim 1, characterized in that: The shielding body (2) is in the shape of a cylinder.

7. The shutter device for radiation protection according to claim 1, characterized in that: The material of the shielding body (2) is lead.

8. The shutter device for radiation protection according to claim 1, characterized in that: The collimator (7) has a height of 88 mm and a length of 62.71 mm.

9. The shutter device for radiation protection according to claim 1, characterized in that: The right end of the fuel rod (6) is arranged between the light emitting diode (4) and the photosensitive diode (5).

10. The shutter device for radiation protection according to claim 1, characterized in that: The depth of the hole of the collimator (7) is 34 mm.

Images