Variable scattering chamber shielding device

Abstract

The application provides a variable scattering cavity shielding device, which comprises a main shielding body (1), a rear cavity being arranged at the rear end of the main shielding body (1), a scattering cavity compensation shielding body (2) being slidably sleeved in the rear cavity of the main shielding body (1), a cylindrical sliding channel being arranged in the scattering cavity compensation shielding body (2), and a radioactive source support (3) being arranged in the cylindrical sliding channel of the scattering cavity compensation shielding body (2). The scattering cavity compensation shielding body (2) slides along the radioactive source support (3) to form a scattering cavity in the rear cavity. The device effectively increases the scattering cavity volume and has a strong shielding effect. Meanwhile, the device has a small volume and a light weight, is convenient to carry, store and transport, and greatly reduces the manufacturing cost.

Description

Technical Field

[0001] This invention relates to the field of radiation measurement technology, and more particularly to a shielding device, especially a variable scattering cavity shielding device. Background Technology

[0002] Radiation monitoring instruments play an indispensable role in detecting radiation intensity. To ensure their performance and accuracy, my country's Metrology Law and related regulations stipulate that they must be verified or calibrated periodically. Currently, the scattering cavity volume of existing irradiation devices is relatively small. In particular, the length of the scattering cavity affects the overall shielding effect of the irradiation device. Furthermore, increasing the lateral dimension of the scattering cavity leads to an increase in the weight and size of the irradiation device.

[0003] In summary, the existing technology has the following problems: the small volume of the scattering cavity in the existing irradiation device leads to poor radiation shielding effect, while increasing the volume of the scattering cavity leads to an increase in the weight and size of the irradiation device, which is inconvenient to carry, store and transport, and also increases the manufacturing cost. Summary of the Invention

[0004] This invention provides a variable scattering cavity shielding device to solve the problems of small scattering cavity volume and poor shielding effect in the prior art. It also avoids the inconvenience of carrying, storing, and transporting due to the increased weight and size of the irradiation device caused by increasing the scattering cavity volume. This device effectively increases the scattering cavity volume without increasing the weight and size of the irradiation device, significantly reducing the effect of scattered radiation and providing a strong shielding effect. Furthermore, this device is small in size and light in weight, making it convenient to carry, store, and transport, and greatly reducing manufacturing costs.

[0005] Therefore, the present invention proposes a shielding device, and more particularly a variable scattering cavity shielding device.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A variable scattering cavity shielding device, comprising:

[0008] Main shield 1, wherein a rear cavity is provided at the rear end of the main shield 1;

[0009] The scattering cavity compensation shield 2 is slidably sleeved in the rear cavity of the main shield 1, and the scattering cavity compensation shield 2 is provided with a cylindrical sliding channel inside.

[0010] The radiation source support 3 is placed in the cylindrical sliding channel of the scattering cavity compensation shield 2. The scattering cavity compensation shield 2 slides along the radiation source support 3 to form a scattering cavity in the rear cavity.

[0011] Furthermore, the front end of the radiation source support 3 is a bushing 31, and the rear end is a positioning ring 35, and the bushing 31 and the positioning ring 35 are connected; the front end of the bushing 31 is provided with a positioning cavity 37 for accommodating the radiation source 33; the rear end of the bushing 31 is provided with a sliding cavity, and the radiation source support 3 also includes a slider 32 that can slide in the sliding cavity. The slider 32 is connected to the scattering cavity compensation shield 2, and the slider 32 is also connected to a pulling device 34, which extends outward from the positioning ring 35.

[0012] Furthermore, the pulling device 34 is a steel wire rope or a pull rod.

[0013] Furthermore, the slider 32 is elongated and includes a middle section 321 and two ends. The middle section 321 of the slider is connected to a pulling device 34, and the two ends are connected to the scattering cavity compensation shield 2.

[0014] Furthermore, the middle part 321 of the slider protrudes from both ends of the slider to form a positioning step 324 that engages with the scattering cavity compensation shield 2.

[0015] Furthermore, the rear end of the bushing 31 is provided with a slit 36 ​​formed on the side wall of the bushing 31, the slit 36 ​​is connected to the sliding cavity, and the two ends of the slider 32 extend out of the sliding cavity.

[0016] Furthermore, the middle part 321 of the slider is provided with a first circular hole 322, and the first circular hole 322 is equipped with a pulling device 34; the two ends of the slider 32 are respectively provided with second circular holes 323, and the slider is connected to the scattering cavity compensation shield 2 through the two end second circular holes 323; by pulling the pulling device 34, the slider 32 is driven to slide, thereby driving the scattering cavity compensation shield 2 to slide on the radiation source support 3 to form a scattering cavity.

[0017] Furthermore, the positioning ring 35 can position the bushing 31, and the center of the positioning ring 35 is provided with a circular hole that can pull out the pulling device 34.

[0018] Furthermore, the rear cavity of the main shield 1 is provided with a rear opening, and guide rods 5 are installed at both ends of the rear opening. The rear end of the main shield is connected to the variable scattering cavity shielding device through the guide rods 5, and a return spring is sleeved on the guide rods 5.

[0019] Furthermore, the variable scattering cavity shielding device also includes a housing 6, in which the main shield 1, the scattering cavity compensation shield 2, the radiation source support 3, and the guide rod 5 are fixed. A positioning hole is provided at the rear end of the housing 6, and the positioning ring 35 is fixed on the positioning hole.

[0020] Furthermore, the variable scattering cavity shielding device is provided with a front cavity at the front end, one end of which is a front opening. The variable scattering cavity shielding device also includes an aperture assembly 4 and a front cover. The aperture assembly 4 and the front cover are used together to be screwed into or out of the front opening of the main shield 1. The aperture assembly 4 and the front cover are detachably connected to the variable scattering cavity shielding device.

[0021] Compared with existing technologies, the variable scattering cavity shielding device of the present invention includes: a main shielding body 1, with a rear cavity at its rear end; a scattering cavity compensation shielding body 2, slidably fitted within the rear cavity of the main shielding body 1, the scattering cavity compensation shielding body 2 having a cylindrical sliding channel inside; and a radiation source support 3, placed within the cylindrical sliding channel of the scattering cavity compensation shielding body 2, the scattering cavity compensation shielding body 2 sliding along the radiation source support 3 to form a scattering cavity within the rear cavity. The formed scattering cavity effectively increases the volume of the scattering cavity, significantly reduces the scattered radiation effect, and provides a strong shielding effect.

[0022] The radiation source support 3 has a bushing 31 at the front end and a positioning ring 35 at the rear end, and the bushing 31 and the positioning ring 35 are connected. The front end of the bushing 31 is provided with a positioning cavity 37 to accommodate the radiation source 33. The rear end of the bushing 31 is provided with a sliding cavity. The radiation source support 3 also includes a slider 32 that can slide in the sliding cavity. The slider 32 is connected to the scattering cavity compensation shield 2, and the slider 32 is also connected to a pulling device 34, which extends outward from the positioning ring 35. This device does not increase the weight and volume of the irradiation device, and has the characteristics of small size and light weight, making it convenient to carry, store and transport, and saving a lot of production costs. Attached Figure Description

[0023] Figure 1 This is a schematic cross-sectional view of the present invention from the right perspective;

[0024] Figure 2 This is a schematic diagram of the radioactive source support structure of the present invention;

[0025] Figure 3 This is a cross-sectional view of the slider of the present invention;

[0026] Figure 4 This is a schematic diagram of the three-dimensional structure of the slider of the present invention.

[0027] Explanation of reference numerals in the attached diagram: 1. Main shield; 2. Scattering cavity compensation shield; 3. Radiation source support; 4. Aperture assembly; 5. Guide rod; 6. Housing; 31. Bushing; 32. Slider; 33. Radiation source; 34. Pulling device; 35. Positioning ring; 36. Slit; 37. Positioning cavity; 321. Middle part; 322. First circular hole; 323. Second circular hole; 324. Positioning step; 325. Both ends. Detailed Implementation

[0028] To provide a clearer understanding of the technical features, objectives, and effects of this invention, the invention is now described.

[0029] This invention provides a variable scattering cavity shielding device, such as... Figure 1 As shown, it includes:

[0030] The main shield 1 has a rear cavity at its rear end. The main shield is the main structure of the radioactive shielding of the variable scattering cavity shielding device, used to shield radiation and ensure the safety of staff and the public. The material is lead or tungsten alloy.

[0031] The scattering cavity compensation shield 2 is slidably fitted into the rear cavity of the main shield 1. The scattering cavity compensation shield 2 achieves reciprocating motion through a pulling device. When the variable scattering cavity shielding device is put into use, the scattering cavity compensation shield 2 is pulled out by the pulling device to form a scattering cavity in the rear cavity of the main shield, resulting in a strong shielding effect. The scattering cavity compensation shield 2 has a cylindrical sliding channel inside. The material of the scattering cavity compensation shield 2 is lead or tungsten alloy, and the outer end is fitted with a buffer energy-absorbing structure by screws, which can effectively absorb radiation.

[0032] The radiation source support 3 is placed inside the cylindrical sliding channel of the scattering cavity compensation shield 2. The scattering cavity compensation shield 2 slides along the radiation source support 3 to form a scattering cavity in the rear cavity, which can enhance the shielding performance behind the main shield.

[0033] Furthermore, the front end of the radiation source support 3 is a bushing 31, such as... Figure 2 As shown, the bushing 31 is made of tungsten alloy to ensure the shielding performance behind the radiation source. The front end of the bushing is provided with a positioning cavity 37 to accommodate the radiation source 33. The positioning cavity is equipped with an outer hoop, a fixing ferrule ring, an inner fixing tube, and a disc spring. The outer hoop is used to fix the ferrule ring. The end of the ferrule ring has a boss structure. When the radiation source is pressed into the ferrule ring, the disc spring pushes the inner fixing tube forward to lock the radiation source at the boss, thus fixing the radiation source.

[0034] The rear end of the radiation source support is a positioning ring 35, and the bushing 31 is connected to the positioning ring 35. The positioning ring 35 can position the bushing 31 to provide support and positioning for the radiation source. The center of the positioning ring 35 is provided with a circular hole that can pull out the traction device 34 to provide traction for the slider. The rear end of the bushing 31 is provided with a sliding cavity. The radiation source support 3 also includes a slider 32 that can slide in the sliding cavity. The slider 32 is connected to the scattering cavity compensation shield 2, and the slider 32 is also connected to the traction device 34. The traction device 34 is a steel wire rope or a pull rod. The traction device 34 extends outward from the positioning ring 35 so that the traction device can be pulled out.

[0035] Furthermore, the slider 32 is elongated, comprising a middle portion 321 and two ends 325, as shown below. Figure 3 As shown, a pulling device 34 is connected to the middle part 321 of the slider to pull out the slider. The middle part 321 of the slider protrudes from both ends of the slider to form positioning steps 324 that engage with the scattering cavity compensation shield 2, so as to position the scattering cavity compensation shield. Figure 4 As shown, the two ends of the slider are connected to the scattering cavity compensation shield 2 so that the slider can drive the scattering cavity compensation shield 2 to slide.

[0036] Furthermore, the rear end of the bushing 31 is provided with a slit 36 ​​formed on the side wall of the bushing 31. The slit 36 ​​connects to the sliding cavity so that the two ends 325 of the slider slide synchronously with the middle part 321. The two ends 325 of the slider 32 are long strip-shaped or arc-shaped lugs that extend out of the sliding cavity so that the slider can be connected to the scattering cavity compensation shield 2.

[0037] Furthermore, the middle part 321 of the slider is provided with a first circular hole 322, and the first circular hole 322 is equipped with a pulling device 34 so as to fix the pulling device in the middle of the slider; the two ends of the slider 32 are respectively provided with second circular holes 323, and the slider is connected to the scattering cavity compensation shield 2 through the two end second circular holes 323. The circular holes at both ends of the slider can position the scattering cavity compensation shield; by pulling the pulling device 34, the slider 32 is driven to slide, thereby driving the scattering cavity compensation shield 2 to slide on the radiation source support 3 to form a scattering cavity. In this way, the internal space can be fully utilized, the overall volume can be reduced, and the shielding performance behind the main shield can be increased.

[0038] Furthermore, the rear cavity of the main shield 1 is provided with a rear opening, and guide rods 5 are installed at both ends of the rear opening. There are two guide rods. The rear end of the main shield is connected to the variable scattering cavity shielding device through the guide rods 5. The guide rods 5 are fitted with return springs so that the scattering cavity compensation shield 2 returns to the locked position in the storage or transportation state.

[0039] Furthermore, the variable scattering cavity shielding device also includes a housing 6, which is an aluminum box, to protect the internal structure of the variable scattering cavity shielding device. The main shield 1, the scattering cavity compensation shield 2, the radiation source support 3, and the guide rod 5 are fixed inside the housing 6. A positioning hole is provided at the rear end of the housing 6, and the positioning ring 35 is fixed on the positioning hole for installation, disassembly, or daily maintenance.

[0040] Furthermore, the variable scattering cavity shielding device has a front cavity at its front end, with one end of the front cavity being an opening. The variable scattering cavity shielding device also includes an aperture assembly 4 and a front cover. The aperture assembly 4 and the front cover are used together to screw into or out of the front opening of the main shielding body 1. The aperture assembly 4 and the front cover are detachably connected to the variable scattering cavity shielding device. The aperture assembly consists of an outer shell, a tungsten alloy ring, a stainless steel ring, and graphite. The graphite is fixed to the front end of the outer shell, and the tungsten alloy ring and stainless steel ring are fixed inside the outer shell. The aperture assembly has a cone angle of 12°. When storing or transporting the variable scattering cavity shielding device, the operation of first screwing out the aperture assembly and then screwing in the front cover is performed sequentially. When the variable scattering cavity shielding device is first used, the operation of first screwing in the front cover and then screwing out the aperture assembly is performed sequentially. The aperture assembly protrudes from the front end of the variable scattering cavity shielding device.

[0041] Furthermore, the variable scattering cavity shielding device also includes a handle and an adjustable base. The handle is fixed to the upper end of the housing for carrying, and the handle is made of aluminum alloy. The adjustable base consists of a base and a shaft. The shaft is mounted on the base and can rotate. The variable scattering cavity shielding device is fixed to the base after being rotated to a certain angle via the shaft. The base is made of stainless steel.

[0042] The radiation source support 3 of the variable scattering cavity shielding device is placed in the cylindrical sliding channel of the scattering cavity compensation shield 2. The scattering cavity compensation shield 2, which is set in the rear cavity of the main shield 1, slides along the radiation source support 3 to form a scattering cavity in the rear cavity. The front end of the radiation source support 3 is a bushing 31 and the rear end is a positioning ring 35. The bushing 31 and the positioning ring 35 are connected. The front end of the bushing 31 is provided with a positioning cavity 37 for accommodating the radiation source 33. The rear end of the bushing 31 is provided with a sliding cavity. The radiation source support 3 also includes a slider 32 that can slide in the sliding cavity. The slider 32 is connected to the scattering cavity compensation shield 2 and is also connected to a pulling device 34. The pulling device 34 extends outward from the positioning ring 35. When storing or transporting this device, the scattering cavity compensation shield 2 is returned to the locked position, and the aperture assembly 4 is screwed out first, followed by the front end cover. When the device is turned on, the scattering cavity compensation shield 2 is pulled out, and the front end cover is screwed in first, followed by the aperture assembly.

[0043] This device effectively increases the volume of the scattering cavity, significantly reduces the effect of scattered radiation, and provides strong shielding, while not increasing the weight and volume of the irradiation device. It is characterized by its small size and light weight, making it convenient to carry, store, and transport, and saving a lot of production costs.

[0044] The above description is merely an illustrative embodiment of the present invention and is not intended to limit the scope of the invention. The various components of the present invention can be combined with each other without conflict. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention should fall within the scope of protection of the present invention.

Claims

1. A variable scattering cavity shielding device, characterized in that, include: The main shield (1) has a rear cavity at its rear end; The scattering cavity compensation shield (2) is slidably sleeved in the rear cavity of the main shield (1), and the scattering cavity compensation shield (2) is provided with a cylindrical sliding channel inside; A radiation source support (3) is placed in the cylindrical sliding channel of the scattering cavity compensation shield (2). The scattering cavity compensation shield (2) slides along the radiation source support (3) to form a scattering cavity in the rear cavity. The front end of the radiation source support (3) is a bushing (31) and the rear end is a positioning ring (35), and the bushing (31) and the positioning ring (35) are connected; the front end of the bushing (31) is provided with a positioning cavity (37) for accommodating the radiation source (33); the rear end of the bushing (31) is provided with a sliding cavity, and the radiation source support (3) also includes a slider (32) that can slide in the sliding cavity. The slider (32) is connected to the scattering cavity compensation shield (2), and the slider (32) is also connected to a traction device (34), which extends outward from the positioning ring (35).

2. The variable scattering cavity shielding device according to claim 1, characterized in that, The pulling device (34) is a wire rope or a pull rod.

3. The variable scattering cavity shielding device according to claim 2, characterized in that, The slider (32) is long and includes a middle part (321) and two ends. The middle part (321) of the slider is connected to a traction device (34), and the two ends are connected to the scattering cavity compensation shield (2).

4. The variable scattering cavity shielding device according to claim 3, characterized in that, The middle part (321) of the slider protrudes from both ends of the slider to form a positioning step (324) that engages with the scattering cavity compensation shield (2).

5. A variable scattering cavity shielding device according to claim 3, characterized in that, The rear end of the bushing (31) is provided with a slit (36) opened on the side wall of the bushing (31), the slit (36) is connected to the sliding cavity, and the two ends of the slider (32) extend out of the sliding cavity.

6. A variable scattering cavity shielding device according to claim 3, characterized in that, The middle part (321) of the slider is provided with a first circular hole (322), and the first circular hole (322) is equipped with a traction device (34); the two ends of the slider (32) are respectively provided with second circular holes (323), and the slider is connected to the scattering cavity compensation shield (2) through the two ends of the second circular holes (323); by pulling the traction device (34) to drive the slider (32) to slide, the scattering cavity compensation shield (2) is driven to slide on the radiation source support (3) to form a scattering cavity.

7. A variable scattering cavity shielding device according to claim 2, characterized in that, The positioning ring (35) can position the bushing (31), and the center of the positioning ring (35) is provided with a circular hole that can pull out the pulling device (34).

8. A variable scattering cavity shielding device according to claim 1, characterized in that, The main shield (1) has a rear opening in its rear cavity, and guide rods (5) are installed at both ends of the rear opening. The rear end of the main shield is connected to the variable scattering cavity shielding device through the guide rods (5), and a return spring is sleeved on the guide rods (5).

9. A variable scattering cavity shielding device according to claim 8, characterized in that, The variable scattering cavity shielding device also includes a housing (6), the main shield (1), the scattering cavity compensation shield (2), the radiation source support (3) and the guide rod (5) are fixed inside the housing (6), and a positioning hole is provided at the rear end of the housing (6), and the positioning ring (35) is fixed on the positioning hole.

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