A passability test method and test tool for an ultralong cylindrical container

Abstract

The application provides a passability test method and test tool for an ultralong cylindrical container, and relates to the technical field of nuclear industry, to solve the technical problem that the existing passability test method cannot meet the passability test of the ultralong cylindrical container with a cage type framework structure. The test method comprises the following steps: fixing the container to a support frame, wherein the center axis of the support frame has a preset angle with the horizontal plane; arranging rollers on corresponding tracks, connecting a traction mechanism to the test tool, and placing the test tool into the container through the traction mechanism; when the simulation piece is in a passing mode, the positions of the limiting rods relative to the simulation piece are constant; when the simulation piece is in a crossing mode, the limiting rod in abutment with the ring plate drives the corresponding guide wheel to rotate, so that the limiting rod in abutment with the ring plate crosses the ring plate. The passability test method is simple and effective, and improves the test efficiency.

Description

Technical Field

[0001] This invention relates to the field of nuclear industry technology, and in particular to a method and tooling for a passability test of an ultra-long cylindrical container. Background Technology

[0002] In the nuclear industry, extra-large, elongated cylindrical containers are used vertically to store product containers containing radioactive waste. The inner cavity of these elongated containers is typically a welded, cage-like reinforcing frame. Furthermore, the gap between the product container and the elongated container is small. During manufacturing, the straightness of the elongated container and the deformation of the reinforcing frame both affect the functionality of the elongated container.

[0003] To verify the functionality of the elongated container, a product container passability test was conducted. In related technologies, when using a horizontally positioned elongated container for the passability test, the heavy weight, excessive length, and cage-like internal structure of the container cause it to jam during dragging. Therefore, existing passability test methods are insufficient for passing the test of ultra-long elongated containers with an internal cage-like skeleton structure. Summary of the Invention

[0004] The purpose of this invention is to provide a passability test method and test fixture for ultra-long cylindrical containers, so as to solve the technical problem that existing passability test methods cannot meet the passability test requirements of ultra-long cylindrical containers with cage-like skeleton structures.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] In a first aspect, the present invention provides a passability test method for an extra-long cylindrical container, wherein the inner wall of the container has a cavity formed by a cage-like skeleton, the cage-like skeleton including at least one ring plate and at least two tracks, the length direction of each track being the same as the axial direction of the container, and the plane of each ring plate being parallel to the cross-section of the container.

[0007] The test fixture includes a simulation component and two crawling mechanisms; each crawling mechanism includes a base and rolling structures on both sides of the base, and each base is located on a corresponding end face of the simulation component;

[0008] Each of the rolling structures includes a support plate and rollers and guide wheels respectively rotatably mounted on the support plate; multiple limiting rods are distributed around the periphery of the guide wheels; the test method includes:

[0009] The container is fixed to a support frame, the central axis of which has a preset angle with the horizontal plane;

[0010] The rollers are set on the corresponding tracks, and the traction mechanism is connected to the test fixture. The test fixture is then placed into the container by the traction mechanism.

[0011] When the simulation component is in the pass mode, the position of each of the limit rods relative to the simulation component remains constant;

[0012] When the simulation component is in the overturning mode, the limiting rod that abuts against the ring plate drives the corresponding guide wheel to rotate, so that the limiting rod that abuts against the ring plate overturns the ring plate.

[0013] According to at least one embodiment of the present invention, fixing the container to a support frame, wherein the central axis of the support frame has a predetermined angle with the horizontal plane, includes:

[0014] Adjust the container so that two of the at least two tracks of the container are located at the bottom of the container.

[0015] According to at least one embodiment of the present invention, the method further includes:

[0016] The test fixture, which is placed inside the container, is pulled out of the long cylindrical container from the end that enters the container by a traction mechanism.

[0017] According to at least one embodiment of the present invention, the preset angle is greater than or equal to 0° and less than 45°.

[0018] According to at least one embodiment of the present invention, the distance between each of the limiting rods and the support plate is a first distance, and the distance between the surface of the roller facing away from the support plate and the support plate is a second distance, wherein the first distance is greater than the second distance;

[0019] On the same guide wheel, a portion of at least one of the plurality of limiting rods is opposite to the outer surface of the corresponding track.

[0020] According to at least one embodiment of the present invention, the elongated cylindrical container is a container with a length greater than 10m.

[0021] According to at least one embodiment of the present invention, in the same crawling mechanism, the support plates in the two rolling structures are arranged symmetrically with respect to the central axis of the simulation component;

[0022] In one of the two rolling structures, the rollers and guide wheels are distributed in a direction away from the simulation element, while in the other rolling structure, the rollers and guide wheels are distributed in a direction closer to the simulation element.

[0023] According to at least one embodiment of the present invention, the simulation component is a long cylindrical shell, and the two ends of the shell have end plates respectively, and each of the bases is disposed on the corresponding end plate of the simulation component.

[0024] According to at least one embodiment of the present invention, the simulation component is a cylindrical structure with a wall of a predetermined thickness, and each of the bases is disposed on a corresponding end face of the wall.

[0025] According to at least one embodiment of the present invention, the axial direction of each of the limiting rods on the guide wheel is the radial direction of the guide wheel.

[0026] According to at least one embodiment of the present invention, the number of limiting rods distributed around the periphery of each guide wheel is four.

[0027] According to at least one embodiment of the present invention, in the same crawling mechanism, the support plates in the two rolling structures, the rollers in the two rolling structures, and the guide wheels in the two rolling structures are all symmetrically arranged with respect to the central axis of the simulation component.

[0028] According to at least one embodiment of the present invention, the plane in which each of the support plates is located passes through the central axis of the simulation element.

[0029] According to at least one embodiment of the present invention, the distance between the contact surface of the roller with the corresponding track and the central axis of the simulation element is a third spacing, the third spacing being the same as the radius of the inner wall of the ring plate.

[0030] According to at least one embodiment of the present invention, the crawling mechanism further includes at least one traction structure, each of the traction structures being disposed at the end of the corresponding base away from the simulation element.

[0031] According to at least one embodiment of the present invention, the material hardness of the simulation component is less than that of stainless steel.

[0032] According to at least one embodiment of the present invention, the test fixture is clearance-fitted with the cavity of the elongated cylindrical device.

[0033] Secondly, the present invention also provides a testing fixture for use in the testing method described in the first aspect.

[0034] In one or more technical solutions provided in the exemplary embodiments of the present invention, at least one of the following beneficial effects can be achieved.

[0035] The passability testing method of this invention, as an exemplary embodiment, is used for passability testing of a test fixture in a long cylindrical container. The test fixture simulates the product container stored in the long cylindrical container. For example, the test fixture includes a simulation component and crawling mechanisms located at both ends of the simulation component. The crawling mechanism includes a base and rolling structures located on both sides of the base. The rollers of the rolling structures can roll on corresponding tracks arranged along the axial direction of the container. The cooperation between the rollers and the tracks allows the entire test fixture to move smoothly within the container. Since the container is fixed to a support frame, and the central axis of the support frame has a preset angle with the horizontal plane, compared to the prior art using a vertically placed container for passability testing, this exemplary embodiment of the invention uses a non-vertical container arrangement, which can replace the sliding friction between the simulation component and the container with rolling friction. The rolling friction operation between the rollers and the tracks is convenient, simple, and effective, improving testing efficiency.

[0036] Furthermore, the rollers are set on corresponding tracks, and the traction mechanism is connected to the test fixture. The test fixture is then inserted into the container via the traction mechanism. When the simulated component is in a passage mode without interference from the ring plate, the positions of each limiting rod relative to the simulated component remain constant; that is, each limiting rod only serves to prevent the rollers from derailing. When the simulated component encounters the ring plate obstacle, the limiting rod abutting against the ring plate drives the corresponding guide wheel to rotate, causing the limiting rod abutting against the ring plate to roll over the ring plate. At the same time, another limiting rod on the guide wheel rotates to an anti-slip position to continue preventing the rollers from sliding. This process repeats, ensuring that even if the simulated component reaches the position of the ring plate, the limiting rods will not be blocked by the ring plate until the entire simulated component is completely inserted into the container cavity. Based on this, the passage test method for ultra-long cylindrical containers provided by the exemplary embodiment of the present invention provides a smooth and uninterrupted test process without causing wear to the inner wall of the container. Attached Figure Description

[0037] The accompanying drawings illustrate exemplary embodiments of the invention and, together with the description thereof, serve to explain the principles of the invention. These drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification.

[0038] Figure 1 This is a schematic diagram of the passability test method according to an embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of the test fixture structure according to an embodiment of the present invention;

[0040] Figure 3 This is a side view of the test fixture according to an embodiment of the present invention;

[0041] Figure 4This is a schematic diagram of the rolling structure according to an embodiment of the present invention;

[0042] Figure 5 This is a schematic diagram of the test fixture and container structure according to an embodiment of the present invention;

[0043] Figure 6 This is a schematic diagram of the crawling mechanism structure according to an embodiment of the present invention.

[0044] Reference numerals: 10, rolling structure; 11, guide wheel; 12, roller; 13, limiting rod; 14, support plate; 21, base; 22, traction structure; 30, simulation component; 40, container; 41, track; 42, ring plate. Detailed Implementation

[0045] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0046] In the nuclear industry, the cavity of an ultra-long cylindrical container is formed by a welded, cage-like reinforced frame structure. This cylindrical container is used vertically to store product containers containing radioactive waste, with minimal clearance between the product container and the long cylindrical container. During manufacturing, the straightness of the long cylindrical container and the deformation of the reinforcing frame both affect its functionality. To verify the functionality of the long cylindrical container, it is necessary to conduct tests using the product container.

[0047] Figure 5 This is a schematic diagram of the test fixture and container structure according to an embodiment of the present invention. Figure 5 As shown, in the test environment of the test fixture of the exemplary embodiment of the present invention, at least one ring plate 42 and at least two tracks 41 are provided on the inner wall of the elongated cylindrical container 40. The length direction of each track 41 is the same as the axial direction of the container 40, and the plane on which each ring plate 42 is located is parallel to the cross-section of the container 40.

[0048] For example, the track 41, which is the internal long stiffening plate of the container 40, has six sections, evenly distributed along the circumference of the container 40. The angle between two adjacent long stiffening plates is 60°, while the number of ring plates 42 is set according to actual needs. Multiple long stiffening plates and ring plates 42 are welded together to form the internal cage-like reinforcing skeleton of the container 40. The multiple long stiffening plates and ring plates 42 together form the cavity for accommodating the test fixture, that is, the radius of the inner wall of the ring plate 42 is the radius of the cavity.

[0049] In actual use, the product container needs to pass through the cavity of the long cylindrical container 40 with a small gap. Therefore, the test fixture simulating the product container also has a small gap fit with the container 40, making it difficult to implement the passability test method for the ultra-long cylindrical container.

[0050] In related technologies, placing a long cylindrical container vertically for a passability test using a testing fixture is simple, but it requires excessively high hoisting height at the test site and necessitates anti-tipping measures for the long cylindrical container, increasing construction costs and making implementation difficult. Using a horizontally placed long cylindrical container for the passability test results in the container being jammed by a cage structure during dragging, making it difficult for testing fixtures used to simulate product containers to effectively complete passability tests on long cylindrical containers.

[0051] To address the aforementioned issues, the passability test method provided by the exemplary embodiment of the present invention uses a roller with a rolling structure to roll on a track. The method incorporates a guide wheel and a limiting rod, which on the one hand restricts the roller from sliding sideways on the track, and on the other hand, when encountering a circumferentially arranged ring plate, the limiting rod rotates to overcome the ring plate obstacle, thereby efficiently completing the passability test.

[0052] Figure 1 This is a schematic diagram of the passability test method according to an embodiment of the present invention. Figure 1 As shown, the passability test method for extra-long cylindrical containers includes the following steps:

[0053] Before introducing the passability test method for extra-long cylindrical containers, the test fixture will be explained first. Figure 2 This is a schematic diagram of the test fixture structure according to an embodiment of the present invention. Figure 2 As shown, the test fixture includes a simulation component 30 and two crawling mechanisms. The shape of the simulation component 30 is fitted with the cavity clearance of the container 40.

[0054] Two crawling mechanisms are located at corresponding ends of the simulation component 30. The simulation component 30 can be used to simulate the product container to be stored in the extra-long cylindrical container 40, for example, a product container for storing radioactive waste. The simulation component 30 has the same shape as the cavity of the container 40. For example, the simulation component 30 is an extra-long cylindrical shape, which can effectively simulate the actual environment where the gap between the actual product container and the long cylindrical container 40 is small.

[0055] Figure 3 This is a side view of the test fixture according to an embodiment of the present invention; Figure 4 This is a schematic diagram of a rolling structure according to an embodiment of the present invention. Figure 3 and Figure 4As shown, each crawling mechanism includes a base 21 and rolling structures 10 on both sides of the base 21. Each base 21 is located on the corresponding end face of the simulation component 30. Each rolling structure 10 includes a support plate 14 and rollers 12 and guide wheels 11 that are rotatably mounted on the support plate 14. The rollers 12 are used to roll on the corresponding track 41. Multiple limiting rods 13 are distributed around the guide wheel 11 to prevent the rollers 12 from sliding sideways on the corresponding track 41. When the test fixture is in the overturning mode, one of the multiple limiting rods 13 is used to abut against the ring plate 42 to make the guide wheel 11 rotate.

[0056] Step 101: Fix container 40 to support frame, wherein the central axis of support frame has a preset angle with the horizontal plane.

[0057] For example, the support frame is used to fix the container 40, so as to maintain stability during the test. The preset angle is greater than or equal to 0° and less than 45°, that is, the extra-long cylindrical container 40 is different from the vertical placement method in the prior art, but is placed horizontally and at a certain angle. With the horizontal placement method, since the rollers 12 of the test fixture are rolled on the corresponding track 41, it can stably contact the track 41, thus running more smoothly and making it less likely for the simulation element 30 to collide with the inner wall of the long cylindrical container 40.

[0058] When the support frame has a certain tilt angle, during the test, the simulation component 30 is entered from the higher end of the container 40, and then pulled in from the other end. Gravity makes manual operation or using a traction device less strenuous.

[0059] In some embodiments, step 101 above further includes: adjusting the container 40 so that two of the at least two tracks 41 of the container 40 are located at the bottom of the container 40, that is, the two tracks 41 are symmetrical with respect to the longitudinal section passing through the central axis of the container 40 in the vertical direction, so that the roller 12 is pressed tightly against the top surface of the track 41 by gravity.

[0060] To ensure that the limiting rod 13 always functions to prevent the roller 12 from slipping during dragging. Figures 3-5 As shown, the distance between each limiting rod 13 and the support plate 14 is the first distance, and the distance between the surface of the roller 12 away from the support plate 14 and the support plate 14 is the second distance. The first distance is greater than the second distance. On the same roller 12, at least one part of the limiting rod 13 among the multiple limiting rods 13 is opposite to the outer side of the corresponding track 41.

[0061] When the first gap is greater than the second gap, the limiting rod 13 is further away from the support plate 14 relative to the roller 12. That is, when the limiting rod 13 drives the guide wheel 11 to rotate, each limiting rod 13 will not be blocked by the roller 12. Furthermore, among the multiple limiting rods 13 distributed around the same roller 12, at least one limiting rod 13 has a portion facing the outer side of the track 41, thus achieving anti-slip limiting of the roller 12 in both the normal operation mode and the overturning mode of the test fixture. It can be understood that the outer side of the track 41 refers to the side of the two tracks 41 that are opposite to each other. For example, the roller 12 is provided on the top surface of the track 41, and at least one limiting rod 13 is located outside the outer side of the track 41. The limiting rods 13 in the two rolling structures of the same crawling mechanism are provided on the outer side surfaces of both tracks 41, thereby limiting the roller 12 to the top surface of the track 41 to achieve anti-slip. On the other hand, there is always a limiting rod 13 on the outer side of the two tracks 41 to ensure the anti-slip function.

[0062] It should be noted that in the test method provided by the exemplary embodiment of the present invention, the length of the long cylindrical container 40 is greater than 10m, and correspondingly, the length of the simulation component 30 is adapted to the length of the long cylindrical container 40, which is also greater than 10m.

[0063] It should be understood that, such as Figure 5 As shown, the spacing and angle between the two rollers 12 in the same crawling mechanism match the positions of the two adjacent long ribs of the container 40, i.e., the two tracks 41. For example, if the angle between the two long ribs is 60°, then the angle between the two rollers 12 is also 60°. Exemplarily, the width of the rollers 12 is equal to or greater than the thickness of the tracks 41 so that the rollers 12 can operate stably.

[0064] To ensure the smooth operation of the simulation component 30 on the track 41, in the same crawling mechanism, the support plates 14, rollers 12, and guide wheels 11 in the two rolling structures 10 are all symmetrically arranged with respect to the central axis of the simulation component 30. That is, the two rolling structures 10 are symmetrically arranged along the vertical center plane of the simulation component 30.

[0065] like Figure 5As shown, since the two tracks 41 are the long stiffeners of the container 40, and the width direction of the stiffeners is the radial direction of the container 40, and the central axis of the simulation component 30 also roughly coincides with the central axis of the container 40 during operation, the plane containing each support plate 14 passes through the central axis of the simulation component 30. That is, the support plate 14 is set along the radial direction of the simulation component 30. In the same crawling mechanism, the included angle between the two support plates 14 is the same as the included angle between the two tracks 41, for example, both are 60°, thus ensuring that the roller 12 is exactly located on the top surface of the track 41, ensuring the smooth operation of the simulation component 30 on the track 41.

[0066] In another alternative implementation, such as Figure 2 As shown, in the same crawling mechanism, the support plates 14 in the two rolling structures 10 are symmetrically arranged with respect to the central axis of the simulation component 30; the rollers 12 and guide wheels 11 of one of the rolling structures 10 are distributed along the direction away from the simulation component 30, and the rollers 12 and guide wheels 11 of the other rolling structure 10 are distributed along the direction close to the simulation component 30.

[0067] The two rolling structures 10 in the same crawling mechanism described above are not completely symmetrically arranged. Specifically, the two support plates 14 are symmetrically arranged with respect to the central axis of the simulation component 30; along the direction of movement of the simulation component 30, in one rolling structure 10, the roller 12 is located in front of the guide wheel 11, and in the other rolling structure 10, the roller 12 is located behind the guide wheel 11. With this alternating arrangement, when the test fixture is in the flipping mode, the limiting rod 13 of one rolling structure 10 first touches the ring plate 42, thereby driving the guide wheel 11 to rotate. After it has flipped over, the limiting rod 13 of the other rolling structure 10 then touches the ring plate 42. The way in which the limiting rods 13 on both sides alternately touch the ring plate 42 can avoid the large friction caused by simultaneous contact, thus making dragging less strenuous; at the same time, since the limiting rods 13 on both sides are located at different axial positions of the track 41, the protection range against side slippage of the roller 12 is larger, and the limiting stability is higher.

[0068] Because the product container in actual applications is extremely long and heavy, the simulation part 30 needs to be reduced in weight to save effort.

[0069] For example, the simulation component 30 is a long cylindrical shell with end plates at both ends, and each base 21 is mounted on the corresponding end plate of the simulation component 30. That is, the simulation component 30 is a shell with very thin walls, which is lighter than a simulation component 30 with thick walls, making it easier to drag. Furthermore, in order to accommodate the installation of the crawling mechanism, end plates are provided at both ends of the cylindrical shell, and the bases 21 are fixed to the end plates, thereby realizing the assembly of the crawling mechanism and the simulation component 30.

[0070] In another alternative implementation, such as Figure 5 As shown, the simulation component 30 is a cylindrical structure with a wall of a preset thickness, and each base 21 is located on the corresponding end face of the wall. This cylindrical structure with a wall thickness is more consistent with the actual simulated product container used for storing nuclear waste. The crawling mechanism can be directly welded to the end of the wall without using end caps to close the end of the simulation component 30.

[0071] Figure 6 This is a schematic diagram of the crawling mechanism structure according to an embodiment of the present invention. Figure 6 As shown, in order to ensure that at least one free end of the limiting rod 13 is always located outside the outer side of the track 41, the number of limiting rods 13 distributed around the periphery of each guide wheel 11 is at least 3, that is, the angle between two adjacent limiting rods 13 is at most 120°.

[0072] For example, the number of limiting rods 13 distributed around the periphery of each guide wheel 11 is 4, that is, the angle between two adjacent limiting rods 13 is 90°. This method can ensure that the test fixture can keep at least one free end of the limiting rod 13 outside the outer side of the track 41, whether in normal operation mode or overturning mode. Moreover, the number of limiting rods 13 is small and the structure is simple.

[0073] like Figure 5 As shown, the distance between the contact surface of the roller 12 with the corresponding track 41 and the central axis of the simulation component 30 is the third spacing, which is the same as the radius of the inner wall of the ring plate 42. The ring plate 42 and the track 41 together form a cage-like structure and form the cavity of the container; therefore, the radius of the container cavity is the same as the radius of the inner wall of the ring plate 42. It should be understood that the inner wall of the ring plate 42 refers to the side opposite the connecting surface of the inner wall of the ring plate 42 and the container 40.

[0074] Since the roller 12 needs to extend beyond the outer surface of the simulation component 30 to support it, its use reduces the gap between the simulation component 30 and the inner cavity of the container 40, potentially causing the simulation component 30 to touch the container 40. In the exemplary embodiment of this invention, the distance between the contact surface of the roller 12 with the corresponding track 41 and the central axis of the simulation component 30 is a third gap, which is the same as the radius of the inner wall of the ring plate 42. By designing the relative positional relationship between the roller 12 and the simulation component 30, the central axis of the simulation component 30 is kept consistent with the central axis of the container 40 during operation, closely mimicking the actual passage of the product container through the elongated cylindrical container 40. Because the third gap is the same as the radius of the inner wall of the ring plate 42, the circumferential gap between the simulation component 30 and the container 40 remains consistent; therefore, even with a small gap, the passability test can be performed smoothly.

[0075] In some embodiments, the material hardness of the simulation component 30 is less than that of stainless steel. For example, the simulation component 30 can be made of aluminum alloy, or it can be made of a material with a hardness less than that of stainless steel. Using such materials makes its hardness less than that of the container 40, which can prevent the simulation component 30 from bumping and abrading the container 40 during transit. Especially in the nuclear industry, where safety requirements are extremely high, even slight wear can render the container 40 unusable for actual product storage.

[0076] Step 102: Set the roller 12 on the corresponding track 41, connect the traction mechanism to the test fixture, and use the traction mechanism to put the test fixture into the container.

[0077] Because the container 40 is an extra-long cylindrical container, and the simulation component 30 is also an extra-long component, it is difficult for a conventional driving device to achieve a smooth entry once one end of the simulation component 30 enters the container 40. The test fixture provided in the exemplary embodiment of the present invention also includes at least one traction structure 22, each traction structure 22 being disposed at the end of the corresponding base 21 away from the simulation component 30.

[0078] For example, the traction structure 22 can be a traction hook, connected to the traction structure 22 by a rope or tie rod, allowing the simulator 30 to be moved through the container 40 by dragging rather than pushing or pulling. In some embodiments, the simulator 30 of the exemplary embodiment of the present invention is relatively light, and the passability test can be conducted by manual dragging or by automatic dragging by a winch.

[0079] For example, a traction structure 22 can be provided on the crawling mechanism at one end of the simulation component 30, or the traction structure 22 can be provided on both crawling mechanisms. When the traction structure 22 is provided on both crawling mechanisms, the simulation component 30 can pass through the container 40 in both directions, thereby simulating the loading and unloading of the product container from the container 40. It should be understood that in some embodiments, the roller 12 and guide wheel 11 described above are both bidirectional rotating wheels.

[0080] Step 1021: The test fixture, which is placed in the elongated cylindrical container 40, is pulled out of the elongated cylindrical container 40 from the end that enters the container 40 by a traction mechanism. This achieves the bidirectional passability test of the simulation component 30 in the elongated cylindrical container 40.

[0081] Step 103: When the simulation component is in the pass mode, the position of each limit rod relative to the simulation component is constant; when the simulation component is in the overturn mode, the limit rod that abuts against the ring plate drives the corresponding guide wheel to rotate, so that the limit rod that abuts against the ring plate overturns the ring plate.

[0082] In actual use, the simulated component 30 is dragged into the container 40 by the rolling of the roller 12, and the position of the limiting rod 13 does not change. When it is dragged to the position of the ring plate 42, the roller 12 continues to roll, and the ring plate 42 will block the passage of one of the limiting rods 13 in the anti-slip position. The test fixture enters the overturning mode, and the limiting rod 13 in the anti-slip position will abut against the ring plate 42. The roller 12 continues to roll, which causes the limiting rod 13 to drive the guide wheel 11 to rotate, thereby raising the position of the limiting rod 13 and passing over the ring plate 42. At the same time, the other limiting rod 13 rotates to the anti-slip position to continue to maintain the anti-slip function of the roller 12 until the entire test fixture is completely inserted into or out of the container 40, completing the passability test.

[0083] The following is a specific implementation method to further illustrate the steps of the passability test method.

[0084] Step 201: Assemble the passability test fixture for a small clearance fit with the ultra-long cylindrical container 40 of the nuclear industry's internal cavity cage structure to be tested;

[0085] Specifically, the guide wheel 11 and roller 12 are installed on the support plate 14 and tightened in place. Then, the support plate 14 and the traction structure 22 are installed on the base 21 respectively to complete the installation of the crawling mechanism. Then, the two crawling mechanisms are welded to the two end faces of the simulation part 30.

[0086] Step 202: Connect the traction rope or traction mechanism to the traction structure 22 at both ends of the test fixture. The length of the traction rope should be greater than the total length of the container 40.

[0087] Step 203: Install container 40 onto the support frame and secure it in place. The support frame can be horizontal or have a certain slope.

[0088] Step 204: Lift the test fixture and place it into the nuclear industrial container 40 from the unsealed end. The rollers 12 on both sides of the test fixture are respectively installed on the two adjacent long stiffening plates at the bottom of the cage inside the container 40, that is, on the track 41.

[0089] Step 205: The traction test fixture is slowly pulled through the container 40 by a traction rope or traction mechanism. In the passing mode and the overturning mode, each roller 12 is always kept on the corresponding track 41. When it encounters the cage-like ring plate 42, the anti-slip limit rod 13 drives the guide wheel 11 to rotate, thereby driving the test fixture to overturn the ring plate 42 until it successfully reaches the bottom of the container 40, verifying that the simulation part 30 can be successfully put into the container 40.

[0090] Step 206: Use the traction rope or traction mechanism on the other side to pull the test fixture slowly through the container 40 in the opposite direction, the process is the same as step 205;

[0091] Step 207: Steps 205 and 206 are successfully completed, which verifies that the nuclear industry long cylindrical container 40 has passed the passability test and meets the usage requirements; the test fixture is taken out and lifted and placed on the workbench for the next nuclear industry long cylindrical container 40 passability test.

[0092] Those skilled in the art should understand that the above embodiments are merely for illustrating the present invention and are not intended to limit the scope of the invention. Those skilled in the art can make other changes or modifications based on the above disclosure, and these changes or modifications still fall within the scope of the present invention.

Claims

1. A method for a passability test of an extra-long cylindrical container, characterized in that, The inner wall of the container has a cavity formed by a cage-like skeleton. The cage-like skeleton includes at least one ring plate and at least two tracks. The length direction of each track is the same as the axial direction of the container, and the plane on which each ring plate is located is parallel to the cross-section of the container. The test fixture includes a simulation component and two crawling mechanisms; each crawling mechanism includes a base and rolling structures on both sides of the base, and each base is located on a corresponding end face of the simulation component; Each of the rolling structures includes a support plate and rollers and guide wheels respectively rotatably mounted on the support plate; multiple limiting rods are distributed around the periphery of the guide wheels; the test method includes: The container is fixed to a support frame, wherein the central axis of the support frame has a preset angle with the horizontal plane; The rollers are set on the corresponding tracks, and the traction mechanism is connected to the test fixture. The test fixture is then placed into the container by the traction mechanism. When the simulation component is in the pass mode, the position of each of the limit rods relative to the simulation component remains constant; When the simulation component is in the overturning mode, the limiting rod that abuts against the ring plate drives the corresponding guide wheel to rotate, so that the limiting rod that abuts against the ring plate overturns the ring plate.

2. The test method according to claim 1, characterized in that, The step of fixing the container to the support frame, wherein the central axis of the support frame has a preset angle with the horizontal plane, includes: Adjust the container so that two of the at least two tracks of the container are located at the bottom of the container.

3. The test method according to claim 1, characterized in that, The test method also includes: The test fixture, which is placed inside the container, is pulled out of the container from the end that enters the container by a traction mechanism.

4. The test method according to claim 1, characterized in that, The preset angle is greater than or equal to 0° and less than 45°.

5. The test method according to any one of claims 1-4, characterized in that, The distance between each of the limiting rods and the support plate is a first distance, and the distance between the surface of the roller facing away from the support plate and the support plate is a second distance, wherein the first distance is greater than the second distance; On the same guide wheel, a portion of at least one of the plurality of limiting rods is opposite to the outer surface of the corresponding track.

6. The test method according to any one of claims 1-4, characterized in that, The container is a container with a length greater than 10m.

7. The test method according to any one of claims 1-4, characterized in that, In the same crawling mechanism, the support plates in the two rolling structures are symmetrically arranged with respect to the central axis of the simulation component; In one of the two rolling structures, the rollers and guide wheels are distributed in a direction away from the simulation element, while in the other rolling structure, the rollers and guide wheels are distributed in a direction closer to the simulation element.

8. The test method according to any one of claims 1-4, characterized in that, The simulation component is a long cylindrical shell with end plates at both ends, and each base is disposed on the corresponding end plate of the simulation component.

9. The test method according to any one of claims 1-4, characterized in that, The simulation component is a cylindrical structure with a wall of a preset thickness, and each base is disposed on the corresponding end face of the wall.

10. A passability testing fixture, characterized in that, Applied to the test method described in any one of claims 1-9.

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