A beta ray sensor self-calibration device and beta ray sensor

Abstract

The present invention relates to a beta ray sensor self-calibration device and a beta ray sensor, comprising a shell and a mylar sheet. A first rotating shaft for mounting a radiation source and a second rotating shaft sleeved on the first rotating shaft are arranged in the shell. The second rotating shaft is provided with a first through hole and a second through hole. Any through hole of the two through holes is sealed by the mylar sheet. When calibration is required, the second rotating shaft is rotated to make the through hole with the mylar sheet face the radiation source. When thickness is measured normally, the second rotating shaft is rotated to make the through hole without the mylar sheet face the radiation source, thereby effectively improving the detection efficiency. The second rotating shaft can also play a further protective role and reduce radiation to the outside. By arranging a circular hole, a rectangular hole and a square hole on the second rotating shaft, the second rotating shaft also has the function of providing a collimating hole. When the beta ray source needs to be closed, the first rotating shaft only needs to be rotated to make the beta ray source face the opposite direction of the shell opening, so that the radiation can be shielded by the shell. The device has very wide applicability.

Description

Technical Field

[0001] The present invention relates to the technical field of radioactive material sensor equipment, and in particular to a beta ray sensor self-calibration device and a beta ray sensor containing the beta ray sensor self-calibration device. Background Art

[0002] β rays are produced by radioactive isotopes such as Kr85. They will be produced regardless of whether they are in use or not, and they are relatively stable in a short period of time. In addition to β rays, Kr85 also produces a certain amount of γ rays. Shielding of γ rays is required during measurement.

[0003] At present, some sheet materials, especially high-precision products, including battery pole pieces, tire rubber cord fabrics, and steel belts, need to strictly ensure the dimensional accuracy of their thickness during the production process in order to ensure that they have high and stable quality. Therefore, it is necessary to frequently test their thickness or density during the production process.

[0004] Most companies use beta-ray sensors for detection. The measurement principle is based on the process of ray projection. Generally, the ray source and the ray detector are configured in groups. The sheet to be tested is placed in the middle. After the ray penetrates the sheet to be tested, the radiation weakens. The attenuation of radiation depends on the density, thickness and composition of the sheet to be tested, and the absorption coefficient depends on the type of ray and the composition of the sheet to be tested.

[0005] Affected by the surrounding environment and its own attenuation caused by long-term use, the accuracy of the β-ray sensor needs to be frequently calibrated during use, usually through a Mylar sheet. Therefore, a Mylar sheet is also installed near the machine where the β-ray sensor is installed. After a period of use, the β-ray sensor is moved to the Mylar sheet for calibration. This not only occupies the limited detection space, but also greatly affects the normal detection efficiency. Summary of the invention

[0006] In order to overcome the defects of the prior art, the present invention provides a beta-ray sensor self-calibration device and a beta-ray sensor. A rotatable second shaft is arranged in a shell where a radiation source is installed. Two through holes are provided on the second shaft, one of which is used to place a Mylar sheet. By rotating the second shaft, both normal detection and calibration can be performed.

[0007] The technical solution to achieve the above purpose is:

[0008] The present invention provides a β-ray sensor self-calibration device, which comprises a shell and a Mylar sheet, wherein the shell has an opening, and a window protective cover is installed on the opening;

[0009] The housing is provided with an open first rotating shaft which can rotate facing the opening, and a radiation source is placed in the first rotating shaft;

[0010] The shell is also provided with a second rotating shaft which is sleeved on the first rotating shaft and rotates coaxially with the first rotating shaft. The second rotating shaft is provided with a first through hole and a second through hole facing the radiation source along its rotation direction. Any through hole of the first through hole and the second through hole is sealed by the Mylar sheet. During normal use, the second rotating shaft is rotated to make the through hole of the first through hole and the second through hole without the Mylar sheet facing the radiation source, so as to measure the thickness of the sheet. When correction is needed, it is only necessary to rotate the second rotating shaft to make the Mylar sheet facing the radiation source, thereby saving limited detection space, greatly improving work efficiency and facilitating operation.

[0011] Furthermore, the second rotating shaft is also provided with circular holes, rectangular holes and square holes facing the radiation source at intervals along its rotation direction. On the basis of providing a correction function, the second rotating shaft can also provide a collimation hole for detection.

[0012] Furthermore, the second rotating shaft is open and consists of an arc-shaped cylinder and end plugs at both ends of the arc-shaped cylinder. The arc-shaped cylinder and the end plugs are detachably connected to facilitate the disassembly and assembly of the second rotating shaft.

[0013] Furthermore, the inner side surface of the second rotating shaft is clearance-matched with the outer side surface of the first rotating shaft, which facilitates the rotation of the second rotating shaft and plays a further protective role, thereby reducing the radiation of the radiation source to the external space.

[0014] Further, the shell is provided with a first rotary cylinder and a second rotary cylinder respectively on both sides of the opening, the first rotary shaft passes through the side wall of the second rotary shaft and is fixedly connected to the first rotary cylinder through a coupling, the second rotary cylinder is fixedly connected to the second rotary shaft and is slidably supported on a side of the first rotary shaft opposite to the first rotary cylinder after passing through the second rotary shaft;

[0015] It also includes an industrial computer and a solenoid valve, the industrial computer is electrically connected to the solenoid valve, the solenoid valve is electrically connected to the first rotating cylinder and the second rotating cylinder respectively, the industrial computer controls the rotation of the first rotating cylinder and the second rotating cylinder respectively through the solenoid valve, thereby driving the rotation of the first rotating shaft and the second rotating shaft respectively.

[0016] The present application also provides a beta-ray sensor, including a box body, the box body is provided with a detection port, the box body is provided with the beta-ray sensor self-calibration device as described above, the beta-ray sensor self-calibration device covers the detection port, and the window protective cover is opposite to the detection port, and the radiation source in the shell body passes through the opening of the shell body and the window protective cover and is detected through the detection port.

[0017] Beneficial effects: Compared with the prior art, the present invention is different in that the β-ray sensor self-calibration device and the β-ray sensor provided by the present invention include a shell and a Mylar sheet, a first rotating shaft for mounting a radiation source and a second rotating shaft sleeved on the first rotating shaft are provided in the shell, the second rotating shaft is provided with a first through hole and a second through hole, any through hole of the two through holes is sealed by the Mylar sheet, when calibration is required, it is only necessary to rotate the second rotating shaft to make the through hole with the Mylar sheet face the radiation source, and when normal thickness measurement is performed, the second rotating shaft is rotated again to make the through hole without the Mylar sheet face the radiation source, which not only effectively improves the detection efficiency, but also saves limited detection space; in addition, the second rotating shaft is sleeved on the first rotating shaft, which can also play a further protective role and reduce the radiation of the radiation source to the outside world; further, by arranging a circular hole, a rectangular hole and a square hole on the second rotating shaft, the second rotating shaft also has the function of providing a collimating hole; further, when the β-ray source needs to be closed, it is only necessary to rotate the first rotating shaft to make the β-ray source face the opposite direction of the shell opening, so that the radiation can be shielded by the shell, and therefore, it has very wide applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a β-ray sensor self-calibration device according to a preferred embodiment of the present application.

[0019] Figure 2 This is a schematic diagram of an explosion of a β-ray sensor self-calibration device according to a preferred embodiment of the present application.

[0020] Figure 3 This is a side cross-sectional view of a β-ray sensor self-calibration device according to a preferred embodiment of the present application.

[0021] Figure 4 This is a front and cross-sectional view of a β-ray sensor self-calibration device according to a preferred embodiment of the present application.

[0022] Figure 5 This is a schematic diagram of the structure of a β-ray sensor according to a preferred embodiment of the present application.

[0023] Among them, 1-shell, 11-first rotary cylinder, 111-coupling, 12-second rotary cylinder, 2-window protective cover, 3-first rotating shaft, 31-radiation source, 32-first bearing, 4-second rotating shaft, 41-arc cylinder, 42-end plug, 43-second bearing, 5-box, 51-detection port. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] See also Figures 1 to 4 As shown, the present invention provides a β-ray sensor self-calibration device, which includes a housing 1 and a Mylar sheet, wherein the bottom surface of the housing 1 is provided with an opening, and the opening is installed with a window protective cover 2;

[0026] The housing 1 is provided with an open first rotating shaft 3 which can rotate facing the opening, and a radiation source 31 is placed in the first rotating shaft 3;

[0027] The shell 1 is further provided with a second rotating shaft 4 which is sleeved on the first rotating shaft 3 and rotates coaxially with the first rotating shaft 3. The second rotating shaft 4 is provided with a first through hole and a second through hole facing the radiation source 31 along its rotation direction. Any through hole of the first through hole and the second through hole is sealed by the Mylar sheet. In normal use, the second rotating shaft 4 is rotated to make the through hole of the first through hole and the second through hole without the Mylar sheet facing the radiation source 31, so as to measure the thickness of the sheet. When correction is needed, it is only necessary to rotate the second rotating shaft 4 to make the through hole with the Mylar sheet facing the radiation source 31, so as to avoid setting up another Mylar sheet next to the sensor, thereby effectively saving detection space, greatly improving work efficiency and facilitating operation.

[0028] Preferably, the second rotating shaft 4 is also provided with circular holes, rectangular holes and square holes facing the radiation source 31 at intervals along its rotation direction. On the basis of the second rotating shaft 4 providing the Mylar correction function, by rotating the second rotating shaft 4 so that the circular hole, rectangular hole or square hole on the second rotating shaft 4 faces the radiation source, the function of a collimation hole can be provided for sensor detection.

[0029] Preferably, the second rotating shaft 4 is open and consists of an arc-shaped cylinder 41 and end plugs 42 at both ends of the arc-shaped cylinder 41 . The arc-shaped cylinder 41 and the end plugs 42 are detachably connected to facilitate the disassembly and assembly of the second rotating shaft 4 .

[0030] Preferably, the inner side surface of the second rotating shaft 4 is clearance-matched with the outer side surface of the first rotating shaft 3 to facilitate the rotation of the second rotating shaft 4 and to further protect and reduce the radiation of the radiation source 31 to the external space.

[0031] Preferably, the housing 1 is provided with a first rotary cylinder 11 and a second rotary cylinder 12 on both sides of the opening, and the first rotating shaft 3 is fixedly connected to the first rotary cylinder 11 through a coupling 111 after passing through the side wall of the second rotating shaft 4, wherein a second bearing 43 sleeved on the first rotating shaft 3 is provided in the side wall of the second rotating shaft 4 at the place where the first rotating shaft 3 passes through the side wall of the second rotating shaft 4, so that the first rotating shaft 3 can rotate freely relative to the second rotating shaft 4;

[0032] The second rotary cylinder 12 is fixedly connected to the second rotating shaft 4, and after passing through the second rotating shaft 4, is slidably supported on the side of the first rotating shaft 3 opposite to the first rotary cylinder 11, wherein a first bearing 32 is embedded in the outer wall on the left side of the first rotating shaft 3, and the end of the second rotary cylinder 12 passes through the second rotating shaft 4 and is embedded in the first bearing 32, so that the second rotary cylinder 12 can rotate freely relative to the first rotating shaft 3;

[0033] It also includes an industrial computer and a solenoid valve, the industrial computer is electrically connected to the solenoid valve, the solenoid valve is electrically connected to the first rotary cylinder 11 and the second rotary cylinder 12 respectively, the industrial computer controls the rotation of the first rotary cylinder 11 and the second rotary cylinder 12 respectively through the solenoid valve, thereby driving the rotation of the first rotating shaft 3 and the second rotating shaft 4 respectively.

[0034] See also Figure 5 As shown, the present application also provides a β-ray sensor, including a box body 5, wherein the box body 5 is provided with a detection port 51, wherein the box body 5 is provided with the β-ray sensor self-calibration device as described above, wherein the β-ray sensor self-calibration device covers the detection port 51, and the window protective cover 2 is directly opposite to the detection port 51, and after the radiation source 31 in the shell body 1 passes through the opening of the shell body 1 and the window protective cover 2, it is detected through the detection port 51.

[0035] It should be noted that the terms "first, second" in the present invention are only used for descriptive purposes and do not indicate any order. They cannot be understood as indicating or implying relative importance. These terms can be interpreted as names.

[0036] The above specific implementation methods are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A β-ray sensor self-calibration device, characterized in that: It includes a shell and a Mylar sheet, the shell has an opening, and the opening is equipped with a window protective cover; The housing is provided with an open first rotating shaft which can rotate facing the opening, and a radiation source is placed in the first rotating shaft; The housing is further provided with a second rotating shaft which is sleeved on the first rotating shaft and rotates coaxially with the first rotating shaft, the second rotating shaft is provided with a first through hole and a second through hole facing the radiation source along its rotation direction, and any through hole of the first through hole and the second through hole is sealed by the Mylar sheet; The inner side surface of the second rotating shaft is clearance-matched with the outer side surface of the first rotating shaft; the first rotating cylinder and the second rotating cylinder are respectively installed on both sides of the opening of the shell, and the first rotating shaft passes through the side wall of the second rotating shaft and is fixedly connected to the first rotating cylinder through a coupling, and the second rotating cylinder is fixedly connected to the second rotating shaft and is slidably supported on the side of the first rotating shaft opposite to the first rotating cylinder after passing through the second rotating shaft.

2. The β-ray sensor self-calibration device according to claim 1, characterized in that: The second rotating shaft is also provided with a circular hole, a rectangular hole and a square hole facing the radiation source at intervals along its rotation direction.

3. The β-ray sensor self-calibration device according to claim 1, characterized in that: The second rotating shaft is open and consists of an arc-shaped cylinder and end plugs at both ends of the arc-shaped cylinder. The arc-shaped cylinder and the end plugs are detachably connected.

4. The β-ray sensor self-calibration device according to any one of claims 1 to 3, characterized in that: It also includes an industrial computer and a solenoid valve, wherein the industrial computer is electrically connected to the solenoid valve, and the solenoid valve is electrically connected to the first rotating cylinder and the second rotating cylinder.

5. A β-ray sensor, characterized in that: It comprises a box body, the box body is provided with a detection port, the beta ray sensor self-calibration device as claimed in any one of claims 1 to 4 is provided in the box body, the beta ray sensor self-calibration device covers the detection port, and the window protective cover faces the detection port.

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