A thin film structure test tool and test method

Abstract

The application relates to the technical field of test tooling, in particular to a thin film structure test tooling and a test method, which comprises a fixing rod, a fixing abutting strip connected to the fixing rod, and the fixing rod being used for being connected with a fixing end; a plurality of fixing bolts, the fixing bolts being slid and arranged on the fixing abutting strip; a moving rod, the moving rod being coaxially arranged with the fixing rod, a moving abutting strip being connected to the moving rod, and the moving rod being used for being connected with a moving end; a plurality of moving bolts, the moving bolts being slid and arranged on the moving abutting strip; the fixing rod, the fixing abutting strip, the moving rod and the moving abutting strip are symmetrically arranged about a reference surface, the central axis of the fixing rod is coplanarly arranged with the reference surface, and the fixing bolts and the moving bolts are perpendicularly arranged with the reference surface; the application has the effect of simulating the fatigue stretching of an anchoring system in actual operation conditions.

Description

Technical Field

[0001] This application relates to the field of testing fixture technology, and in particular to a thin film structure testing fixture and testing method. Background Technology

[0002] Liquefied natural gas (LNG) storage tanks are special cryogenic pressure vessels used to store LNG at temperatures down to -163°C under normal pressure. Based on tank type, they can be divided into four categories: horizontal / vertical, mother-daughter tanks, full-containment tanks, and membrane-type tanks. Among them, membrane-type LNG storage tanks represent an innovative cryogenic storage technology. By separating structural support, thermal insulation, and airtightness functions in their design, they significantly improve the safety, economy, and environmental friendliness of large LNG storage tanks, making them suitable for both land and sea use.

[0003] When moving a storage tank containing liquefied natural gas, the internal liquid oscillations can exert impact pressure on the shielding membrane, affecting the strength of the anchoring structure. Alternatively, thermal expansion and contraction caused by the internal liquid temperature can lead to displacement of the shielding membrane structure in direct contact with the liquid. This displacement can occur at very high frequencies. To verify the mechanical stability of the shielding membrane structure after high-frequency displacement, mechanical testing is required. In actual testing, the main plywood is usually connected to a mechanical device, and then the device is used to repeatedly apply tension to the main plywood, causing relative displacement between the main plywood and the secondary plywood, thus simulating the displacement during use.

[0004] Regarding the aforementioned technologies, mechanical equipment is used inside the tank to apply force to the main plywood, causing relative displacement between the main plywood and the secondary plywood. However, there is a deviation between the tensile force applied to the main plywood by the mechanical equipment and the actual tensile force exerted by the liquid inside the tank on the main plywood. This results in the main plywood exerting a component force perpendicular to the main plywood on the mechanical equipment after the tensile force applied by the mechanical equipment acts on the shielding membrane. This leads to deviations in the detection data of the mechanical equipment and also affects its service life. Summary of the Invention

[0005] In order to reduce the impact of tensile force deviation on the detection accuracy and service life of mechanical equipment while ensuring the accuracy of test results, this application provides a thin film structure testing fixture and testing method.

[0006] The thin film structure testing fixture and testing method provided in this application adopt the following technical solution:

[0007] In one aspect, this application provides a thin film structure testing fixture.

[0008] A thin film structure testing fixture, comprising:

[0009] A fixing rod, on which a fixing abutment strip is connected, and the fixing rod is used to connect to a fixing end;

[0010] Multiple fixing bolts, which slide and pass through the fixing abutment strip;

[0011] A movable rod, which is coaxially arranged with the fixed rod, is connected to a movable abutment strip, and is used to connect to a movable end;

[0012] Multiple movable bolts, which slide and pass through the movable abutment strip;

[0013] The fixed rod, fixed abutment strip, movable rod, and movable abutment strip are all symmetrically arranged about the reference plane. The central axis of the fixed rod is coplanar with the reference plane, and the fixed bolt and movable bolt are both perpendicular to the reference plane.

[0014] By adopting the above technical solution, first prepare two sets of shielding film structures, each with through holes, and adjust the relative positions of the main plywood and the secondary upper plywood within the same set until they overlap, then connect them with anchor bolts; then, arrange the two sets of shielding film structures symmetrically about the reference plane, and then pass the moving bolt through the through holes in the moving abutment strip and the two main plywoods, making the main plywood abut against the moving abutment strip; then, pass the fixing bolt through the through holes in the fixing abutment strip and the two secondary upper plywoods, making the secondary upper plywood abut against the fixing abutment strip; next, move the moving rod towards the end away from the fixing rod by the target value, then reset the moving rod. While moving the moving rod towards the end away from the fixing rod, apply force to the moving abutment strip and apply force to the two main plywoods through the moving bolt. This completes one test, and the test is repeated multiple times until the number of tests reaches the preset value; once the number of tests reaches... After reaching the preset value, observe whether the main plywood is damaged and whether the anchor bolts can be tightened normally. If the main plywood is damaged and / or the anchor bolts cannot be tightened normally, the membrane structure performance is unqualified; otherwise, the membrane structure performance is qualified. The designed membrane structure test fixture can form a fixed end for fixing the shielding membrane by using a fixed rod and a fixed abutment strip, and a movable end for fixing the shielding membrane by using a movable rod and a movable abutment strip. The secondary plywood can be fixed to the fixed abutment strip by using a fixed bolt, and the main plywood can be fixed to the movable abutment strip by using a movable bolt. At this time, since the two sets of shielding membranes are symmetrically set about the reference plane, the component of the force perpendicular to the direction of the tension applied by the movable rod can cancel each other out, thereby reducing the impact of tension deviation on the detection accuracy of the mechanical equipment and avoiding the impact on the service life of the mechanical equipment.

[0015] In one specific implementation, a first smooth rod segment is formed on the fixing bolt, and the first smooth rod segment contacts the fixing abutment strip and the shielding film structure; a second smooth rod segment is formed on the movable bolt, and the second smooth rod segment contacts the movable abutment strip and the shielding film structure.

[0016] By adopting the above technical solution, the designed fixed bolts and movable bolts with smooth rod sections can avoid the threads from contacting the fixed or movable abutment bars, which would cause the threads to deform when the movable rod moves and applies force, affecting the consistency of the tensile force applied to the shielding film by multiple fixed bolts or movable bolts.

[0017] In one specific implementation, at least one fixed bending rib is connected to the fixed abutment strip, and the fixed bending rib is arranged along the arrangement direction of the plurality of fixed bolts.

[0018] By adopting the above technical solution, the designed fixed bending rib can improve the bending performance of the fixed abutment strip, thereby making the tensile force applied to the shielding film by the multiple fixing bolts distributed along the setting direction of the fixed bending rib consistent.

[0019] In one specific implementation, the fixed bending rib is connected to the fixed rod.

[0020] By adopting the above technical solution, the fixed bending rib designed to connect with the fixed rod can further improve the bending performance of the fixed abutment strip.

[0021] In one specific implementation, at least one movable anti-bending rib is connected to the movable abutment bar, and the movable anti-bending rib is arranged along the arrangement direction of the plurality of movable bolts.

[0022] By adopting the above technical solution, the designed movable bending rib can improve the bending performance of the movable abutment strip, thereby making the tensile force applied to the shielding film by multiple movable bolts distributed along the setting direction of the movable bending rib consistent.

[0023] In one specific implementation, the movable bending rib is connected to the movable rod.

[0024] By adopting the above technical solution, the designed movable anti-bending rib connected to the movable rod can further improve the bending performance of the movable abutment strip.

[0025] Secondly, this application provides a method for testing thin film structures, including:

[0026] S1: Sample preparation. Prepare two sets of shielding film structures with through holes, and adjust the relative positions of the main plywood and the secondary plywood in the same set until the main plywood and the secondary plywood have an overlapping area. A shielding film is also set between the secondary plywood and the main plywood. The shielding film is welded and fixed to the secondary plywood. Then, the connection between the main plywood, the shielding film and the secondary plywood is achieved by anchor bolts.

[0027] S2: Sample clamping, so that the two sets of shielding layer film structures are symmetrically set about the reference plane, and then the moving bolt passes through the through holes on the moving abutment strip and the two main plywoods, and the main plywoods abut against the moving abutment strip. Then the fixing bolt passes through the through holes on the fixing abutment strip and the two secondary upper plywoods, and the secondary upper plywoods abut against the fixing abutment strip.

[0028] S3: Tensile test. First, move the moving rod toward the end away from the fixed rod to the target value. Then, reset the moving rod. While moving the moving rod toward the end away from the fixed rod, apply force to the moving abutment strip and apply force to the two main plywood through the moving bolt. This completes one test. Repeat the test multiple times until the number of tests reaches the preset value.

[0029] S4: Result recording. After the number of tests reaches the preset value, observe whether the main plywood is damaged and whether the anchor bolts can be turned normally. If the main plywood is damaged and / or the anchor bolts cannot be turned normally, the performance of the shielding layer film structure is unqualified; otherwise, the performance of the shielding layer film structure is qualified.

[0030] By adopting the above technical solution, first prepare two sets of shielding film structures, each with through holes, and adjust the relative positions of the main plywood and the secondary upper plywood within the same set until they overlap, then connect them with anchor bolts; then, arrange the two sets of shielding film structures symmetrically about the reference plane, and then pass the moving bolt through the through holes in the moving abutment strip and the two main plywoods, making the main plywood abut against the moving abutment strip; then, pass the fixing bolt through the through holes in the fixing abutment strip and the two secondary upper plywoods, making the secondary upper plywood abut against the fixing abutment strip; next, move the moving rod towards the end away from the fixing rod by the target value, then reset the moving rod. While moving the moving rod towards the end away from the fixing rod, apply force to the moving abutment strip and apply force to the two main plywoods through the moving bolt. This completes one test, and the test is repeated multiple times until the number of tests reaches the preset value; once the number of tests reaches... After reaching the preset value, observe whether the main plywood is damaged and whether the anchor bolts can be tightened normally. If the main plywood is damaged and / or the anchor bolts cannot be tightened normally, the membrane structure performance is unqualified; otherwise, the membrane structure performance is qualified. The designed membrane structure test method uses a fixed rod in conjunction with a fixed abutment strip to form a fixed end for fixing the shielding membrane, and a moving rod in conjunction with a moving abutment strip to form a moving end for fixing the shielding membrane. The fixed bolts can fix the secondary plywood to the fixed abutment strip, and the moving bolts can fix the main plywood to the moving abutment strip. At this time, since the two sets of shielding membranes are symmetrically set about the reference plane, the component of the force perpendicular to the direction of the tension applied by the moving rod can cancel each other out, thereby reducing the impact of tension deviation on the detection accuracy of the mechanical equipment and avoiding the impact on the service life of the mechanical equipment.

[0031] In one specific implementation, in step S2, a first smooth rod segment is formed on the fixing bolt, the first smooth rod segment is in contact with the fixing abutment strip and the secondary upper plywood, and a second smooth rod segment is formed on the moving bolt, the second smooth rod segment is in contact with the moving abutment strip and the main plywood.

[0032] By adopting the above technical solution, the fixed bolts and movable bolts with smooth rod sections can avoid the threads from contacting the fixed abutment strip or the movable abutment strip, which would cause the threads to deform when the movable rod moves and applies force, affecting the consistency of the tensile force applied to the shielding film by multiple fixed bolts or movable bolts.

[0033] In one specific implementation, in step S3, during the tensile test, the ambient temperature of the sample is controlled to keep the ambient temperature at the target value T℃.

[0034] By adopting the above technical solution and controlling the ambient temperature of the sample, the performance of the shielding layer film structure can be tested when the tank contains liquids of different temperatures.

[0035] In summary, this application includes at least one of the following beneficial technical effects:

[0036] 1. The designed thin-film structure testing fixture can form a fixed end for fixing the shielding film by using a fixed rod and a fixed abutment strip, and a movable end for fixing the shielding film by using a movable rod and a movable abutment strip. The upper plywood can be fixed to the fixed abutment strip by fixing bolts, and the main plywood can be fixed to the movable abutment strip by movable bolts. At this time, since the two sets of shielding films are symmetrically set about the reference plane, the component of the tensile force applied by the movable rod perpendicular to the tensile force direction can cancel each other out, thereby reducing the impact of tensile force deviation on the detection accuracy of the mechanical equipment, and also avoiding the impact on the service life of the mechanical equipment.

[0037] 2. The designed thin-film structure test fixture, through the fixed bolts and movable bolts with smooth rod sections, can avoid the threads from contacting the fixed or movable abutment strips, which would cause the threads to deform when the movable rod moves and applies force, affecting the consistency of the tensile force applied to the shielding film by multiple fixed or movable bolts.

[0038] 3. The designed membrane structure test fixture can improve the bending resistance of the fixed abutment strip by fixing the bending ribs, thereby making the tensile force applied to the shielding membrane by the multiple fixing bolts distributed along the setting direction of the fixed bending ribs consistent. Attached Figure Description

[0039] Figure 1 This is a cross-sectional view of the shielding layer thin film structure in this application.

[0040] Figure 2 This is a schematic diagram of the thin film structure testing fixture according to an embodiment of this application.

[0041] Figure 3 yes Figure 2 The cross-sectional view in the image is mainly used to show the positional relationship between the shielding thin film structure and the test fixture.

[0042] Figure 4 Is Figure 2 A schematic diagram of the structure after adding fixed and movable bending ribs to the original structure.

[0043] Figure 5 yes Figure 4 Another perspective illustration, mainly used to show the moving bending ribs.

[0044] Explanation of reference numerals in the attached drawings: 01, main plywood; 02, secondary plywood; 03, anchor bolt; 04, shielding film; 1, fixing rod; 2, fixing abutment strip; 3, fixing bolt; 4, moving rod; 5, moving abutment strip; 6, moving bolt; 7, fixing anti-bending rib; 8, moving anti-bending rib. Detailed Implementation

[0045] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0046] This application discloses a thin film structure testing fixture and testing method.

[0047] In a first aspect, embodiments of this application disclose a thin film structure testing fixture.

[0048] Reference Figure 1 The shielding layer thin film structure includes a main plywood 01, a secondary upper plywood 02, an anchor bolt 03, and a shielding film 04. There is an overlap area between the main plywood 01 and the secondary upper plywood 02. The shielding film 04 is located between the main plywood 01 and the secondary upper plywood 02, and the shielding film 04 is located within the overlap area. The shielding film 04 has a through hole for the anchor bolt 03 to pass through, and the diameter of the through hole is larger than the outer diameter of the anchor bolt 03, so as to facilitate the welding and fixing between the shielding film 04 and the secondary upper plywood 02. The anchor bolt 03 is installed through the main plywood 01, the secondary upper plywood 02, and the shielding film 04.

[0049] Reference Figure 2 A thin-film structure testing fixture includes a fixing rod 1, a fixing abutment strip 2, and multiple fixing bolts 3. One end of the fixing rod 1 is welded and fixed to the fixing abutment strip 2, and the other end is used for detachable fixed connection to the fixing end of a mechanical device. The fixing abutment strip 2 has multiple through holes for the fixing bolts 3 to pass through. The fixing bolts 3 pass through the through holes and are slidably connected to the fixing abutment strip 2. In this application, the fixing abutment strip 2 can be a solid structure or a hollow structure. In order to reduce the overall weight of the testing fixture and facilitate the operation of the operator, the fixing abutment strip 2 is preferably a square tube in this embodiment.

[0050] Reference Figure 2 Furthermore, the thin film structure testing fixture also includes a movable rod 4, a movable abutment strip 5, and multiple movable bolts 6. One end of the movable rod 4 is welded and fixed to the movable abutment strip 5, and the other end is used for detachable fixed connection to the movable end of the mechanical equipment. The movable abutment strip 5 has multiple through holes for the movable bolts 6 to pass through. The movable bolts 6 pass through the through holes and are slidably connected to the movable abutment strip 5. In this application, the movable abutment strip 5 can be a solid structure or a hollow structure. In order to reduce the overall weight of the testing fixture and facilitate the operation of the operator, the movable abutment strip 5 in this embodiment is a hollow tubular structure.

[0051] Reference Figure 2 and Figure 3 Since the main plywood 01 and the secondary upper plywood 02 are connected by anchor bolts 03, and the secondary upper plywood 02 is pressed against the fixed abutment strip 2 by fixing bolts 3, and when force is applied to the main plywood 01 by moving bolts 6, the tension at both ends is not on the same straight line, which will generate lateral torque, thus affecting the service life and detection accuracy of the mechanical equipment. Therefore, the main plywood 01 and the secondary upper plywood 02 are a set of shielding film structures. There are two sets of shielding film structures in this application. The two sets of shielding film structures are symmetrical about the reference plane, and the fixing rod 1, the fixed abutment strip 2, the moving rod 4 and the moving abutment strip 5 are all symmetrical about the reference plane. The central axis of the fixing rod 1 and the moving rod 4 are coplanar with the reference plane, and the fixing bolts 3 and the moving bolts 6 are perpendicular to the reference plane.

[0052] Reference Figure 3 Furthermore, a first smooth section is formed on the fixing bolt 3. The first smooth section contacts the fixing abutment strip 2 and the secondary upper plywood 02. The threaded section on the fixing bolt 3 is threaded with a first fastening nut. After the fixing bolt 3 passes through the secondary upper plywood 02, the fixing abutment strip 2 and the secondary upper plywood 02 in sequence, the first fastening nut is tightened so that the two secondary upper plywood 02 abut against the fixing abutment strip 2. The fixing bolt 3 and the moving bolt 6 with smooth sections can avoid the threads from contacting the fixing abutment strip 2 or the moving abutment strip 5, which would cause the threads of the moving rod 4 to deform when it moves and applies force, affecting the consistency of the tensile force applied to the shielding film by multiple fixing bolts 3 or moving bolts 6.

[0053] Reference Figure 3 and Figure 4 Furthermore, in order to improve the bending resistance of the fixed abutment strip 2, so as to avoid uneven stress on the upper plywood 02 caused by the bending of the fixed abutment strip 2 when force is applied to the fixed abutment strip 2 by the fixed rod 1, at least one fixed bending rib 7 is welded and fixed on the fixed abutment strip 2. The fixed bending rib 7 is arranged along the arrangement direction of the plurality of fixed bolts 3, and the fixed bending rib 7 is welded and fixed to the fixed rod 1. In this application, there are two fixed bending ribs 7, and the two fixed bending ribs 7 are located on opposite sides of the fixed rod 1.

[0054] Reference Figure 3 and Figure 4 Specifically, a second smooth rod section is formed on the movable bolt 6. The second smooth rod section contacts the movable abutment strip 5 and the main plywood 01. The threaded section on the movable bolt 6 is threaded with a second fastening nut. After the movable bolt 6 passes through the main plywood 01, the movable abutment strip 5 and the main plywood 01 in sequence, the two main plywood 01 are pressed against the movable abutment strip 5 by tightening the second fastening nut.

[0055] Reference Figure 3 and Figure 5 Furthermore, in order to improve the bending resistance of the movable abutment strip 5, so as to avoid uneven stress on the main plywood 01 caused by the bending of the movable abutment strip 5 when force is applied to the movable abutment strip 5 by the movable rod 4, at least one movable anti-bending rib 8 is welded and fixed on the movable abutment strip 5. The movable anti-bending rib 8 is arranged along the arrangement direction of the plurality of movable bolts 6, and the movable anti-bending rib 8 is welded and fixed to the movable rod 4. In this application, there are two movable anti-bending ribs 8, and the two movable anti-bending ribs 8 are located on opposite sides of the movable rod 4.

[0056] The implementation principle of a thin-film structure testing fixture according to an embodiment of this application is as follows: First, prepare two sets of shielding thin-film structures, each with through holes, and adjust the relative positions of the main plywood 01 and the secondary upper plywood 02 within the same set until they have an overlapping area, then connect them with anchor bolts 03; then, arrange the two sets of shielding thin-film structures symmetrically about a reference plane, and then pass the moving bolt 6 through the moving abutment strip 5 and the through holes on the two main plywood 01, so that the main plywood 01 abuts against the moving abutment strip 5; then, pass the fixing bolt 3 through the fixing abutment strip 2 and the through holes on the two secondary upper plywood 02, so that the secondary upper plywood 02 abuts against the fixing abutment strip 2; next, move the moving rod 4 towards the end away from the fixing rod 1 by a target value, and then reset the moving rod 4. While moving the moving rod 4 towards the end away from the fixing rod 1, it applies force to the moving abutment strip 5 and applies force to the two main plywood 01 through the moving bolt 6. A single test is completed, and the test is repeated multiple times. Until the number of tests reaches the preset value; after the number of tests reaches the preset value, observe whether the main plywood 01 is damaged and whether the anchor bolt 03 can be turned normally. If the main plywood 01 is damaged and / or the anchor bolt 03 cannot be turned normally, the performance of the membrane structure is unqualified; otherwise, the performance of the membrane structure is qualified. The fixed end for fixing the shielding membrane can be formed by the fixed rod 1 and the fixed abutment strip 2. The movable end for fixing the shielding membrane can be formed by the movable rod 4 and the movable abutment strip 5. The secondary plywood 02 can be fixed to the fixed abutment strip 2 by the fixed bolt 3. The main plywood 01 can be fixed to the movable abutment strip 5 by the movable bolt 6. At this time, since the two sets of shielding membranes are symmetrically set about the reference plane, the component force perpendicular to the direction of the tension force generated by the tension force applied by the movable rod 4 can be mutually canceled, thereby reducing the impact of tension deviation on the detection accuracy of the mechanical equipment and avoiding the impact on the service life of the mechanical equipment.

[0057] Secondly, this application discloses a method for testing thin film structures.

[0058] Reference Figures 1 to 5A method for testing thin film structures, implemented using the thin film structure testing fixture disclosed in the first aspect of the embodiments of this application, includes:

[0059] S1: Sample preparation: Prepare two sets of shielding film structures with through holes, and adjust the relative positions of the main plywood 01 and the secondary upper plywood 02 in the same set until the main plywood 01 and the secondary upper plywood 02 have an overlapping area. A shielding film 04 is also provided between the secondary upper plywood 02 and the main plywood 01. The shielding film 04 is welded and fixed to the secondary upper plywood 02. Then, the connection between the main plywood 01, the shielding film 04 and the secondary upper plywood 02 is realized by anchor bolts 03.

[0060] S2: The sample is clamped so that the two sets of shielding film structures are symmetrically set about the reference plane. Then, the moving bolt 6 passes through the moving abutment strip 5 and the through holes on the two main plywood 01, and the main plywood 01 abuts against the moving abutment strip 5. Then, the fixing bolt 3 passes through the fixing abutment strip 2 and the through holes on the two secondary upper plywood 02, and the secondary upper plywood 02 abuts against the fixing abutment strip 2.

[0061] S3: Tensile test. First, move the moving rod 4 toward the end away from the fixed rod 1 to the target value. Then, reset the moving rod 4. While moving the moving rod 4 toward the end away from the fixed rod 1, apply force to the moving abutment strip 5 and apply force to the two main plywood 01 through the moving bolt 6. The test is completed in one go. Repeat the test multiple times until the number of tests reaches the preset value.

[0062] S4: Result Recording. After the number of tests reaches the preset value, observe whether the main plywood 01 is damaged, observe whether the anchor bolt 03 can be turned normally, and check whether the support reaction force of the tensioning equipment is normal. If the main plywood 01 is damaged and / or the anchor bolt 03 cannot be turned normally, the performance of the shielding layer film structure is unqualified; otherwise, the performance of the shielding layer film structure is qualified.

[0063] The fixed end for fixing the shielding film can be formed by the fixed rod 1 and the fixed abutment strip 2. The movable end for fixing the shielding film can be formed by the movable rod 4 and the movable abutment strip 5. The secondary plywood 02 can be fixed to the fixed abutment strip 2 by the fixed bolt 3, and the main plywood 01 can be fixed to the movable abutment strip 5 by the movable bolt 6. At this time, since the two sets of shielding films are symmetrically arranged about the reference plane, the component force perpendicular to the direction of the tension force generated by the tension force applied by the movable rod 4 can cancel each other out, thereby reducing the impact of tension deviation on the detection accuracy of the mechanical equipment and avoiding the impact on the service life of the mechanical equipment.

[0064] Furthermore, in step S2, a first smooth rod segment is formed on the fixing bolt 3, which contacts the fixing abutment strip 2 and the secondary upper plywood 02. A second smooth rod segment is formed on the moving bolt 6, which contacts the moving abutment strip 5 and the main plywood 01. The fixing bolt 3 and the moving bolt 6 with smooth rod segments can prevent the threads from contacting the fixing abutment strip 2 or the moving abutment strip 5, thereby causing the threads of the moving rod 4 to deform when it moves and applies force, affecting the consistency of the tensile force applied to the shielding film by multiple fixing bolts 3 or moving bolts 6.

[0065] Furthermore, in step S3, during the tensile test, the ambient temperature of the sample is controlled to be within the target value T℃. In this embodiment, the target value T can be above zero, such as room temperature, equal to zero, or below zero, such as -20℃. Controlling the ambient temperature of the sample allows for testing the performance of the shielding layer film structure when the tank contains liquids of different temperatures.

[0066] Specifically, step S4 includes:

[0067] S41: After the number of tests reaches the preset value, observe whether the main plywood 01 is damaged, observe whether the anchor bolt 03 can be turned normally, and check whether the support reaction force of the tensioning equipment is normal. If the main plywood 01 is damaged and / or the anchor bolt 03 cannot be turned normally, the performance of the shielding layer film structure is unqualified; otherwise, the performance of the film structure is qualified.

[0068] S42: After disassembling the anchor bolt 03, remove the main plywood 01, and then observe whether there is any damage at the weld point between the shielding film 04 and the secondary plywood 02. If there is no damage at the weld point, the shielding layer film structure is qualified.

[0069] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A thin film structure testing fixture, characterized in that: include: A fixing rod (1) is connected to a fixing abutment strip (2), and the fixing rod (1) is used to connect to a fixing end; Multiple fixing bolts (3) are slidably inserted into and pass through the fixing abutment strip (2); A movable rod (4) is coaxially arranged with the fixed rod (1), and a movable abutment strip (5) is connected to the movable rod (4), and the movable rod (4) is used to connect with the movable end; Multiple movable bolts (6) are slidably mounted on the movable abutment strip (5); The fixed rod (1), fixed abutment strip (2), moving rod (4) and moving abutment strip (5) are all symmetrically arranged about the reference plane. The central axis of the fixed rod (1) is coplanar with the reference plane, and the fixed bolt (3) and moving bolt (6) are both perpendicular to the reference plane, so that the component force perpendicular to the direction of the tension force generated by the tension force applied by the moving rod (4) cancels each other out. The shielding film structure consists of a main plywood (01), a secondary upper plywood (02), an anchor bolt (03), and a shielding film (04). The main plywood (01) and the secondary upper plywood (02) have an overlapping area. The shielding film (04) is located between the main plywood (01) and the secondary upper plywood (02), and is situated within the overlapping area. The shielding film (04) has a through-hole for the anchor bolt (03) to pass through, and the diameter of the through-hole is larger than the outer diameter of the anchor bolt (03) to facilitate welding and fixing between the shielding film (04) and the secondary upper plywood (02). The anchor bolt (03) passes through the main plywood (01). The main plywood (01), the secondary plywood (02), and the shielding film (04) are provided. The movable bolt (6) passes through the main plywood (01), and the fixed bolt (3) passes through the secondary plywood (02). The main plywood (01), the secondary plywood (02), the anchor bolt (03), and the shielding film (04) are all provided in pairs. The fixed abutment strip (2) is located between the two secondary plywoods (02) and attached to the secondary plywood (02). The movable abutment strip (5) is located between the two main plywoods (01) and attached to the main plywood (01).

2. The thin film structure testing fixture according to claim 1, characterized in that: A first smooth rod segment is formed on the fixing bolt (3), and the first smooth rod segment is in contact with the fixing abutment strip (2) and the shielding film structure; a second smooth rod segment is formed on the moving bolt (6), and the second smooth rod segment is in contact with the moving abutment strip (5) and the shielding film structure.

3. The thin film structure testing fixture according to claim 1, characterized in that: At least one fixed bending rib (7) is connected to the fixed abutment strip (2), and the fixed bending rib (7) is arranged along the arrangement direction of the plurality of fixed bolts (3).

4. The thin film structure testing fixture according to claim 3, characterized in that: The fixed bending rib (7) is connected to the fixed rod (1).

5. The thin film structure testing fixture according to claim 1, characterized in that: At least one movable anti-bending rib (8) is connected to the movable abutment strip (5), and the movable anti-bending rib (8) is arranged along the arrangement direction of the plurality of movable bolts (6).

6. The thin film structure testing fixture according to claim 5, characterized in that: The movable anti-bending rib (8) is connected to the movable rod (4).

7. A method for testing thin film structures, characterized in that: The thin film structure testing fixture described in any one of claims 1-6 is used, comprising: S1: Sample preparation: Prepare two sets of shielding film structures with through holes, and adjust the relative positions of the main plywood (01) and the secondary plywood (02) in the same set until the main plywood (01) and the secondary plywood (02) have an overlapping area. A shielding film (04) is also provided between the secondary plywood (02) and the main plywood (01). The shielding film (04) is welded and fixed to the secondary plywood (02). Then, the connection between the main plywood (01), the shielding film (04) and the secondary plywood (02) is realized by anchor bolts (03). S2: The sample is clamped so that the two sets of shielding film structures are symmetrically set about the reference plane. Then, the moving bolt (6) passes through the through holes on the moving abutment strip (5) and the two main plywood (01) and makes the main plywood (01) abut against the moving abutment strip (5). Then, the fixing bolt (3) passes through the through holes on the fixing abutment strip (2) and the two secondary upper plywood (02) and makes the secondary upper plywood (02) abut against the fixing abutment strip (2). S3: Tensile test. First, move the moving rod (4) toward the end away from the fixed rod (1) to the target value. Then, reset the moving rod (4). While moving the moving rod (4) toward the end away from the fixed rod (1), apply force to the moving abutment strip (5) and apply force to the two main plywood (01) through the moving bolt (6). The single test is completed. Repeat the test multiple times until the number of tests reaches the preset value. S4: Result recording. After the number of tests reaches the preset value, observe whether the main plywood (01) is damaged and whether the anchor bolt (03) can be turned normally. If the main plywood (01) is damaged and / or the anchor bolt (03) cannot be turned normally, the performance of the shielding layer film structure is unqualified. Otherwise, the performance of the shielding layer film structure is qualified.

8. The thin film structure testing method according to claim 7, characterized in that: In S2, a first smooth rod segment is formed on the fixing bolt (3), and the first smooth rod segment contacts the fixing abutment strip (2) and the secondary upper plywood (02). A second smooth rod segment is formed on the moving bolt (6), and the second smooth rod segment contacts the moving abutment strip (5) and the main plywood (01).

9. The thin film structure testing method according to claim 7, characterized in that: In step S3, during the tensile test, the ambient temperature of the sample is controlled to keep it at the target value T℃.

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