Radioactive substance transportation container heat resistance test support and test method

Abstract

The invention discloses a radioactive substance transportation container heat resistance test support which comprises a supporting frame, a connecting frame is fixedly arranged at the upper end of the supporting frame, a plurality of tying holes are evenly formed in the side portion of the connecting frame in the length direction, at least one movable beam is detachably and fixedly connected to the connecting frame, and the supporting frame is designed to be of a lifting structure; according to the invention, the number of the movable beams and the positions of the movable beams are determined according to the size of the container, after the movable beams are fixed on the connecting frame, the container is fixed on the bracket, the steel cable for binding the container is bound on the tying hole, then the bracket is sent into a heating furnace for heating, and the heat resistance of the container is tested. The container can be always positioned at the fire spraying port of the heating furnace, so that the container is uniformly heated, and the test precision is improved.

Description

Technical Field

[0001] This invention relates to the field of test support technology, and in particular to a heat resistance test support and test method for radioactive material transport containers. Background Technology

[0002] Radioactive materials refer to items containing radioactive nuclides whose activity and specific activity both exceed the exemption values ​​stipulated by the state. They can spontaneously release invisible rays such as alpha, beta, and gamma rays, as well as neutron flux. They are widely used in industrial irradiation, agricultural breeding, medical diagnosis, and nuclear energy development. However, excessive exposure may cause damage to human tissues or radiation-induced diseases, and in severe cases, death. The emitted rays may also cause deterioration of photosensitive materials.

[0003] Because radioactive materials pose a significant hazard to human health, containers used to hold them are generally subject to specific regulations. For example, regarding heat resistance, national regulations require containers holding radioactive materials to undergo heat resistance testing to verify their safety performance under fire conditions. The heat resistance test requires exposing the container to a thermal environment for 30 minutes, where the heat flux density is at least equivalent to that of a hydrocarbon fuel / air flame under completely static conditions. This results in a minimum average flame emission coefficient of 0.9, an average temperature of at least 800°C, and the sample being completely engulfed by the flame, achieving a surface absorption coefficient of 0.8, or using the actual absorption coefficient value of the container exposed to a specified flame. Currently, the following methods are generally used for fire testing of containers holding radioactive materials: The first method is for containers equipped with lifting lugs or other lifting structures, where the container sample is directly lifted onto the heating furnace trolley, and the trolley drives the container into the heating furnace for heating. The second method is to place the container sample on a fixed support, then place the support on a heating furnace trolley, and the trolley will move the entire support into the heating furnace for heating. However, all of the above heating methods have certain problems. For example, the first method cannot adjust the height of the container, which means that the flame nozzle cannot be directly aimed at the container for heating, easily leading to uneven heating of the container. Although the second method can raise the container to the flame nozzle through the support, the support is fixed. When the size of the container changes, the container will deviate from the flame nozzle, which also cannot be heated evenly. Therefore, each type of container requires a corresponding support, resulting in a waste of resources. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the prior art by providing a heat resistance testing bracket and testing method for radioactive material transport containers.

[0005] To solve the above problems, the technical solution adopted by the present invention is as follows: A heat resistance test bracket for a radioactive material transport container includes a support frame, which is a lifting structure for adjusting the height of the support frame. A connecting frame is fixedly installed at the upper end of the support frame. Multiple bolt holes are evenly opened on the side of the connecting frame along the length direction. At least one movable beam is detachably and fixedly connected to the connecting frame.

[0006] Preferably, the support frame includes two parallel crossbeams, with support legs fixedly connected to the crossbeams, and at least two longitudinal beams between the two crossbeams, with the longitudinal beams fixedly connected to the support legs.

[0007] Preferably, both the crossbeam and the longitudinal beam are made of square tubing.

[0008] Preferably, the support leg includes a sleeve, the upper end of which is fixedly connected to the crossbeam. A first positioning hole is provided on the sleeve, and a movable rod is slidably disposed inside the sleeve. A plurality of second positioning holes are provided on the movable rod, and a positioning pin is inserted into the first positioning hole and one of the second positioning holes.

[0009] Preferably, the connecting frame is fixedly provided with lifting lugs.

[0010] Preferably, the connecting frame includes a horizontal plate and a vertical plate fixedly disposed on one side of the horizontal plate. The horizontal plate and the vertical plate are arranged perpendicularly, and a reinforcing plate is disposed between the horizontal plate and the vertical plate. The bolt hole is located on the vertical plate.

[0011] Preferably, a plurality of first insertion holes are evenly provided along the length of the horizontal plate, and a second insertion hole is provided on the movable beam. A fixing column is inserted after the second insertion hole and one of the first insertion holes overlap.

[0012] Preferably, the upper end face of the movable beam is provided with a plurality of limiting holes evenly distributed along the length direction, and two limiting blocks are detachably and fixedly connected to the movable beam. The two limiting blocks are located on both sides of the container and are used to limit the position of the container.

[0013] Preferably, multiple temperature sensors are provided on the crossbeam and the longitudinal beam.

[0014] A method for testing the heat resistance of a radioactive material transport container includes the following steps: Step 1: Determine the number of movable beams based on the size of the container, and fix the movable beams to the support frame; Step 2: Place the container on the support and secure it to the support with steel cables. The steel cables are tied to the bolt holes of the connecting frame. Step 3: Adjust the size of the support legs according to the size of the container; Step 4: Hook the lifting hook onto the lifting lug and lift the bracket holding the container onto the heating furnace trolley; Step 5: The lifting hook is separated from the lifting lug, and the heating furnace trolley moves the support into the heating furnace to heat the container for a heat resistance test; Step 6: After the test is completed, the heating furnace trolley will move the support out of the heating furnace, hook the lifting hook onto the lifting lug, and lift the support to the cold bridge area to allow the container to cool naturally. Step 7: Record the experimental data and finally clean up the site.

[0015] The beneficial effects of adopting the above technical solution are as follows: In this invention, the movable beams can be positioned on the support frame. Therefore, the position and number of movable beams can be adjusted according to the size of the container, so that the support can support the container and accommodate containers of different sizes, allowing various types of containers to be placed on the support. At the same time, the support legs of the support can also be adjusted in height, so that the container on the support can always correspond to the flame nozzle of the heating furnace, allowing the flame emitted from the flame nozzle to directly heat the container and make the container heated evenly. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the present invention; Figure 2 This is a three-dimensional schematic diagram of the support frame of the present invention; Figure 3 This is a three-dimensional schematic diagram of the connecting frame of the present invention; Figure 4 This is a three-dimensional schematic diagram of the movable beam of the present invention; Figure 5 This is a three-dimensional schematic diagram of the limiting block of the present invention; Figure 6 This is an exploded view of the support leg of the present invention.

[0017] In the diagram: 1 is the support frame, 2 is the connecting frame, 3 is the bolt hole, 4 is the movable beam, 5 is the crossbeam, 6 is the support leg, 7 is the longitudinal beam, 8 is the sleeve, 9 is the first positioning hole, 10 is the movable rod, 11 is the second positioning hole, 12 is the positioning column, 13 is the lifting lug, 14 is the horizontal plate, 15 is the vertical plate, 16 is the reinforcing plate, 17 is the first insertion hole, 18 is the second insertion hole, 19 is the fixed column, 20 is the temperature sensor, 21 is the limiting hole, and 22 is the limiting block. Detailed Implementation

[0018] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0019] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] like Figure 1As shown, a heat resistance testing bracket for a radioactive material transport container includes a support frame 1. The support frame 1 is a height-adjustable structure, and includes two parallel horizontal beams 5. Multiple support legs 6 are fixedly connected to the lower end of each horizontal beam 5, and are vertically arranged to support the beams 5. The beams 5 and support legs 6 are fixedly connected by welding. To achieve this fixed connection, at least two longitudinal beams 7 are provided between the two beams 5, with both ends of the longitudinal beams 7 fixedly connected to the support legs 6 on the two horizontal beams 5 respectively. The longitudinal beam 7 and the support leg 6 are fixedly connected by welding. When there are two longitudinal beams 7, the two cross beams are located on one side of both ends of the cross beam 5. In this embodiment, there are four longitudinal beams 7, and two longitudinal beams 7 are respectively provided at both ends of the cross beam 5 to enhance the structural strength of the support. A connecting frame 2 is fixedly provided at the upper end of the support frame 1. Specifically, the connecting frame 2 is fixedly provided on the cross beam 5. The connecting frame 2 and the cross beam 5 are fixedly connected by welding. Multiple bolt holes 3 are evenly provided on the side of the connecting frame 2 along the length direction. At least one movable beam 4 is detachably fixedly connected to the connecting frame 2. In this invention, the number of movable beams 4 and their positions on the connecting frame 2 are determined according to the size of the container. After determining the number of movable beams 4, the movable beams 4 are fixedly connected to the connecting frame 2. Then, the container is placed on the movable beams 4, which provide support for the container. The container is then fixed to the support by steel cables. After the steel cables are tied to the container, the two ends are tied to the bolt holes 3 of the connecting frame 2. After the container is tied, the support is sent into a heating furnace for heating. The support in this application can adapt to containers of different sizes, thereby reducing the amount of support manufacturing and reducing resource waste.

[0022] Furthermore, both the crossbeam 5 and the longitudinal beam 7 are made of square tubing.

[0023] Furthermore, such as Figure 6As shown, the support leg 6 is a telescopic structure. The support leg 6 includes a sleeve 8, the upper end of which is fixedly connected to the lower end face of the crossbeam 5. A first positioning hole 9 is provided on the side wall of the sleeve 8. A movable rod 10 is slidably arranged inside the sleeve 8. Multiple second positioning holes 11 are evenly provided along the length direction on the side wall of the movable rod 10. When the first positioning hole 9 and one of the second positioning holes 11 coincide, a positioning pin 12 is inserted, thus enabling the size adjustment of the support leg 6. In this embodiment, after the container is tied and fixed, its height may be different due to the different sizes and shapes of the containers. Therefore, in order to ensure that the container is at the flame nozzle, the height of the support leg 6 can be adjusted so that the container is always at the flame nozzle, and the flame can directly act on the container, making the container heat evenly. During the adjustment process, the height of the support leg 6 is adjusted by sliding the movable rod 10. When the position of the movable rod 10 is fixed, the first positioning hole 9 coincides with one of the second positioning holes 11, and then the positioning pin 12 is inserted.

[0024] In another embodiment, a plurality of first positioning holes 9 can be opened on the side wall of the sleeve 8 along the height direction, and a second positioning hole 11 can be opened on the side wall of the movable rod 10. During the sliding process of the movable rod 10, the second positioning hole 11 can be made to coincide with one of the positioning holes 9. After the height adjustment is completed, the positioning pin 12 can be inserted into the second positioning hole 11 and the first positioning hole 9 that coincides with it.

[0025] Furthermore, a support plate is fixedly connected to the lower end of the movable rod 10. The support plate is horizontally set, which can increase the contact area between the support and the ground, making the support more stable and preventing the support from tipping over.

[0026] Furthermore, such as Figure 1 As shown, multiple lifting lugs 13 are fixedly installed on the connecting frame 2. The lifting lugs 13 are located on one side of the end of the connecting frame 2. During the movement of the support, the hook of the gantry crane can be hooked onto the lifting lugs 13 for hoisting and movement.

[0027] Furthermore, such as Figure 3 As shown, the connecting frame 2 includes a horizontal plate 14 and a vertical plate 15 fixedly disposed on one side of the horizontal plate 14. The horizontal plate 14 and the vertical plate 15 are vertically arranged. The length of the horizontal plate 14 is the same as the length of the crossbeam 5. The horizontal plate 14 is horizontally welded and fixed to the upper end face of the crossbeam 5. The vertical plate 15 is the same length as the horizontal plate 14. A reinforcing plate 16 is disposed between the horizontal plate 14 and the vertical plate 15. The reinforcing plate 16 is located at the end of the horizontal plate 14. The reinforcing plate 16 can enhance the structural strength of the horizontal plate 14 and the vertical plate 15 and prevent the horizontal plate 15 from being deformed and broken due to excessive tension after the steel cable is tied. The bolt hole 3 is located on the vertical plate 15. The bolt hole 3 adopts a long strip hole structure design to facilitate the binding of the steel cable.

[0028] Furthermore, the horizontal plate 14 has a plurality of first insertion holes 17 evenly distributed along its length, and the movable beam 4 has a second insertion hole 18. A fixing post 19 is inserted after the second insertion hole 18 and one of the first insertion holes 17 are aligned. In this embodiment, when adjusting the position of the movable beam 4, the second insertion hole 18 on the movable beam 4 can be moved to align with the first insertion hole 17 on the horizontal plate 14. After alignment, inserting the fixing post 19 allows the movable beam 4 to be fixedly connected to the connecting frame 2. The fixing post 19 can be a bolt.

[0029] It should be noted that, in order to increase the insertion depth of the fixing post 19, multiple third insertion holes can be opened on the upper end face of the crossbeam 5. The number of third insertion holes is the same as that of the first insertion holes 17 and their positions correspond one-to-one, so that the fixing post 19 can continue to be inserted into the third insertion hole after being inserted into the first insertion hole 17, thereby making the movable beam 4 firmly fixed. In addition, the movable beam 4 can be made of I-beams, and the second insertion hole 18 is opened on the lower flange.

[0030] Furthermore, such as Figure 1 , Figure 4 and Figure 5 As shown, the upper end face of the movable beam 4 is evenly provided with a plurality of limiting holes 21 along the length direction. Two limiting blocks 22 are detachably and fixedly connected to the movable beam 4. The two limiting blocks 22 are located on both sides of the container. In this embodiment, after the container is fixed to the movable beam 4 by steel cables, in order to prevent the container from moving left and right during hoisting, limiting blocks 22 can be set on both sides of the container. The limiting blocks 22 are close to the side wall of the container to limit the container and prevent the container from moving left and right.

[0031] It should be noted that a limiting post is fixedly provided at the lower end of the limiting block 22. The limiting post is inserted into one of the limiting holes 21, so that the limiting block 22 can be located on both sides of the container and limit and fix the container to prevent the container from moving left and right.

[0032] Furthermore, in order to make the limiting block 22 fit more tightly with the container, a threaded hole is made on the limiting block 22, and a locking screw is threaded into the threaded hole. A locking plate is fixedly connected to the end of the locking screw near the container. After the limiting block 22 is fixed on the movable beam 4, the locking plate is moved to the side closer to the container by rotating the locking screw until it fits tightly with the container, thereby completing the locking and fixing of the container. A locking nut can be threaded onto the locking screw to facilitate the locking and fixing of the locking screw.

[0033] Furthermore, such as Figure 1As shown, multiple temperature sensors 20 are installed on the crossbeam 5 and the longitudinal beam 7. The temperature sensors 20 are armored thermocouples, which can detect the temperature data around the support during the fire test, thereby determining whether the container is heated evenly. Since the crossbeam 5 is made of square tubing, the middle part of the crossbeam 5 is a hollow structure. The connecting wires of the temperature sensors 20 can pass through the hollow structure in the middle of the crossbeam 5 and eventually extend to the outside of the heating furnace, which is convenient for data monitoring.

[0034] A method for testing the heat resistance of a radioactive material transport container includes the following steps: Step 1: Determine the number of movable beams 4 according to the size of the container, and fix the movable beams 4 to the support frame 1; Step 2: Place the container on the support and secure it to the support with a steel cable. The steel cable is tied to the bolt hole 3 of the connecting frame 2. Step 3: Adjust the size of support leg 6 according to the size of the container; Step 4: Hook the lifting hook onto the lifting lug 13 and lift the bracket holding the container onto the heating furnace trolley; Step 5: The lifting hook is separated from the lifting lug 13, and the heating furnace trolley moves the support into the heating furnace to heat the container for a heat resistance test; Step 6: After the test is completed, the heating furnace trolley will move the support out of the heating furnace, hook the lifting hook onto the lifting lug 13, and lift the support to the cold bridge site to allow the container to cool naturally. Step 7: Record the experimental data and finally clean up the site.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A heat resistance test stand for a radioactive material transport container, characterized by, The utility model provides a support frame (1) is the lifting structure for the height adjustment of support frame (1), and the upper end of support frame (1) is fixedly provided with the connecting frame (2), and the side of connecting frame (2) is evenly provided with a plurality of tethering holes (3) along the length direction, and at least one movable beam (4) is detachably fixedly connected on connecting frame (2).

2. A heat resistance test stand for a radioactive material transport container according to claim 1, characterized in that, The support frame (1) comprises two parallel arranged cross beams (5), the cross beams (5) are fixedly connected with support legs (6), at least two longitudinal beams (7) are arranged between the two cross beams (5), and the longitudinal beams (7) are fixedly connected with the support legs (6).

3. A heat resistance test stand for a radioactive material transport container according to claim 2, characterized in that, The cross beams (5) and the longitudinal beams (7) are all made of square tubes.

4. The heat resistance test stand for a radioactive material transport container according to claim 2, characterized by The support leg (6) comprises a sleeve pipe (8), the upper end of the sleeve pipe (8) is fixedly connected with the cross beam (5), the sleeve pipe (8) is provided with a first positioning hole (9), the sleeve pipe (8) is slidably provided with a movable rod (10), the movable rod (10) is provided with a plurality of second positioning holes (11), and the first positioning hole (9) and one of the second positioning holes (11) are coincided and inserted with a positioning column (12).

5. The heat resistance test stand for a radioactive material transport container according to claim 2, characterized by The connecting frame (2) is fixedly provided with an ear (13).

6. The heat resistance test stand for a radioactive material transport container according to claim 2, characterized by The connecting frame (2) comprises a horizontal plate (14) and a vertical plate (15) fixedly arranged on one side of the horizontal plate (14), the horizontal plate (14) and the vertical plate (15) are arranged perpendicularly, a reinforcing plate (16) is arranged between the horizontal plate (14) and the vertical plate (15), and the tethering hole (3) is located on the vertical plate (15).

7. A heat resistance test stand for a radioactive material transport container according to claim 6, characterized in that, A plurality of first insertion holes (17) are evenly arranged on the horizontal plate (14) along the length direction, a second insertion hole (18) is arranged on the movable beam (4), and a fixing column (19) is inserted into the second insertion hole (18) and one of the first insertion holes (17).

8. The heat resistance test stand for a radioactive material transport container according to claim 2, characterized by A plurality of limiting holes (21) are evenly arranged on the upper end surface of the movable beam (4) along the length direction, and two limiting blocks (22) are detachably fixedly connected to the movable beam (4), and the two limiting blocks (22) are respectively located on the two sides of the container and used for limiting the container.

9. The heat resistance test stand for a radioactive material transport container according to claim 2, characterized by A plurality of temperature sensors (20) are arranged on the cross beams (5) and the longitudinal beams (7).

10. A method of heat resistance testing of a radioactive material transport container, characterized by, The test support frame is used, and the steps include the following: Step 1: the number of movable beams (4) is determined according to the size of the container, and the movable beams (4) are fixedly connected to the support frame (1); Step 2: the container is placed on the support frame, the container and the support frame are fixedly connected through a steel cable, and the steel cable is bound on the tethering hole (3) of the connecting frame (2); Step 3: the size of the support leg (6) is adjusted according to the size of the container; Step 4: the lifting hook is hooked on the ear (13), and the support frame bound with the container is lifted to the heating furnace trolley; Step 5: the lifting hook is separated from the ear (13), the heating furnace trolley drives the support frame to move into the heating furnace, and the container is heated to perform heat resistance test. Step 6: After the test is completed, the furnace trolley is heated to move the support out of the heating furnace, the lifting hook is hooked on the lifting lug (13), the support is lifted to the cold bridge site, and the container is naturally cooled; Step 7: Record the experimental data and finally clean up the site.

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