A device for elastic gasket hydrogen embrittlement resistance test

Abstract

The utility model discloses a device for elastic washer anti hydrogen embrittlement test belongs to material mechanics performance test field. The device includes upper pull rod subassembly, lower pull rod subassembly, first group and second group connecting pull rod and multiple sets of positioning pin and washer pad. Upper pull rod subassembly and lower pull rod subassembly are fixedly connected through connecting pull rod respectively, and are connected with the persistent creep testing machine respectively, the lower pull rod pressing plate is slidably arranged in the first group connecting pull rod, and the upper pull rod supporting plate is slidably arranged in the second group connecting pull rod, so that the both relatively set between the upper and lower connecting plates and can produce relative displacement. The positioning pin is detachably installed in one of supporting plate and pressing plate, and is used for setting elastic washer, and the washer pad is set in the other end of positioning pin, and interacts with the other one of supporting plate and pressing plate to transfer load. The utility model can accurately apply and keep constant load, guarantees the coaxial degree, and can test multiple, multiple specifications elastic washers at one time, effectively improves test accuracy, efficiency and versatility.

Description

Technical Field

[0001] This utility model belongs to the field of material mechanical property testing technology, specifically relating to a device for testing the hydrogen embrittlement resistance of elastic washers. Background Technology

[0002] Resilient washers, as anti-loosening elements in threaded fastener connections, are widely used in aerospace, engineering machinery, and other fields. During the manufacturing process of resilient washers, processes such as smelting, hot working, heat treatment, and subsequent machining (such as pickling and electroplating) leave residual hydrogen atoms inside the product. Under the combined action of external load-induced stress or internal residual stress, these hydrogen atoms will undergo early brittle fracture under static load conditions at room temperature and below the yield strength after a certain period. Hydrogen embrittlement of resilient washers typically manifests as delayed fracture under stress, posing a significant threat to normal safe use. Therefore, hydrogen embrittlement testing of resilient washers is of great engineering significance.

[0003] Currently, the commonly used hydrogen embrittlement resistance testing device in the industry is a thick metal plate with threaded through holes. Elastic washers are tested by screwing bolts into the threaded holes and applying a fixed torque using a torque wrench. However, this device has the following problems: 1. The bolts are prone to deformation and loosening during the test, leading to load variations and affecting the accuracy of the test results; 2. Only one elastic washer can be tested per threaded hole at a time, resulting in low efficiency; 3. The threaded hole size is fixed, only suitable for elastic washers of specific sizes, resulting in poor versatility. Utility Model Content

[0004] The purpose of this invention is to solve the problems of existing elastic gasket hydrogen embrittlement resistance testing devices, such as inability to accurately apply constant loads, low testing efficiency, and poor versatility. In response, an hydrogen embrittlement resistance testing device is proposed that can accurately apply constant test loads, complete hydrogen embrittlement resistance tests on multiple elastic gaskets at once, and is applicable to elastic gaskets of different sizes.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] An apparatus for hydrogen embrittlement resistance testing of elastic washers is provided, comprising an upper pull rod assembly, a lower pull rod assembly, a first set of connecting pull rods, a second set of connecting pull rods, and multiple sets of locating pins and washers;

[0007] The upper pull rod assembly includes an upper pull rod connecting plate and an upper pull rod support plate. The upper pull rod connecting plate and the upper pull rod support plate are arranged parallel to each other at intervals and are fixedly connected by a first set of connecting pull rods.

[0008] The pull rod assembly includes a pull rod connecting plate and a pull rod pressure plate. The pull rod connecting plate and the pull rod pressure plate are arranged parallel to each other at intervals and are fixedly connected by a second set of connecting rods.

[0009] The upper pull rod connecting plate and the lower pull rod connecting plate are used to connect with the upper and lower clamps of the creep testing machine, respectively. The lower pull rod pressure plate is slidably mounted on the first set of connecting pull rods, and the upper pull rod support plate is slidably mounted on the second set of connecting pull rods, so that the upper pull rod support plate and the lower pull rod pressure plate are located between the upper pull rod connecting plate and the lower pull rod connecting plate and are arranged vertically opposite to each other. Thus, when the upper pull rod connecting plate and the lower pull rod connecting plate are driven to move relative to each other, the upper pull rod support plate and the lower pull rod pressure plate will generate relative displacement.

[0010] Multiple sets of locating pins and washers are used to accommodate elastic washers of different sizes. Each set includes one locating pin and one washer. The locating pin is detachably and vertically mounted on one of the upper pull rod support plate and the lower pull rod pressure plate for mounting the elastic washer to be tested. The washer is detachably mounted on the end of the locating pin opposite to its mounting end and interacts with the other of the upper pull rod support plate and the lower pull rod pressure plate to transfer the force applied by the lower pull rod pressure plate or the upper pull rod support plate to the elastic washer mounted on the locating pin, thereby applying an axial load to the elastic washer.

[0011] Furthermore, in the multiple sets of locating pins and washers, the locating pins of different sets have different diameters, and the washers that match them have different diameter center holes, so as to adapt to elastic washers with different inner diameters respectively.

[0012] Furthermore, the washer has a large diameter section and a small diameter section. The small diameter section is used to extend into the mating hole on the other of the upper pull rod support plate and the lower pull rod pressure plate. The large diameter section is used to press against the elastic washer. One axial end face of the large diameter section is used to contact the other of the upper pull rod support plate and the lower pull rod pressure plate to be limited, and the other axial end face is used to press against the elastic washer.

[0013] Furthermore, one end of the positioning pin is provided with a limiting head, and one of the upper pull rod support plate and the lower pull rod pressure plate is provided with a positioning hole that mates with the limiting head. The positioning pin is installed in the positioning hole through the limiting head to achieve the limiting.

[0014] Furthermore, both the first and second sets of connecting rods consist of a rod and a hexagonal nut. The upper rod connecting plate, the upper rod support plate, the lower rod pressure plate, and the lower rod connecting plate are each provided with a through hole or threaded hole for the rod to pass through, and are locked and fixed by the hexagonal nut.

[0015] Furthermore, both the upper and lower tie rod connecting plates are equipped with equipment connecting bolts for connecting to the upper and lower clamps of the creep testing machine.

[0016] Furthermore, the upper tie rod connecting plate, upper tie rod support plate, lower tie rod pressure plate, and lower tie rod connecting plate are all made of 30CrMnSiA structural steel, while the first set of connecting rods and the second set of connecting rods are both made of 40Cr steel.

[0017] Furthermore, the device can simultaneously install multiple locating pins, and each locating pin can be alternately fitted with multiple elastic washers and flat washers, so as to realize the hydrogen embrittlement resistance test of multiple elastic washers at one time.

[0018] The advantages of this utility model are:

[0019] 1. The device for hydrogen embrittlement resistance testing of elastic washers provided by this utility model, by connecting to a creep testing machine and utilizing its high-precision force sensor to monitor the loading force, can apply and maintain a precise and constant test load on the elastic washer over a long period. This fundamentally overcomes the load variation problem caused by bolt deformation and loosening in traditional methods, greatly ensuring the accuracy and reliability of the hydrogen embrittlement test results. Simultaneously, the device, relying on the matching design of the locating pin and the washer pad, as well as the interaction between the washer pad and the opposite plate, ensures a clear load transfer path and coaxiality of the loading force during the test, avoiding test errors caused by off-center loading.

[0020] 2. This utility model employs a design with multiple sets of locating pins and washers, enabling the same device to accommodate elastic washers of different specifications and sizes. This significantly enhances the versatility of the equipment, eliminating the need to manufacture tooling separately for different sizes of washers and saving production costs. Furthermore, the locating pin design allows for the simultaneous installation of multiple elastic washers, enabling batch testing and greatly improving testing efficiency. Attached Figure Description

[0021] The above and / or other features and advantages of the present invention will become more readily understood from the following description with reference to the accompanying drawings, which are not drawn to scale and some features are enlarged or reduced to show details of specific parts.

[0022] Figure 1 This is a three-dimensional cross-sectional view of the device for hydrogen embrittlement resistance testing of elastic washers according to this utility model;

[0023] Figure 2 This is a front cross-sectional view of the device for hydrogen embrittlement resistance testing of elastic washers according to this utility model;

[0024] Figure 3 This is a side cross-sectional view of the device for hydrogen embrittlement resistance testing of elastic washers according to this utility model.

[0025] In the diagram: 11-Upper pull rod connecting plate; 12-Upper pull rod support plate; 21-Lower pull rod pressure plate; 22-Lower pull rod connecting plate; 3-First connecting pull rod; 4-Second connecting pull rod; 5-Positioning pin; 6-Washer; 7-Hexagonal nut; 8-Equipment connecting bolt; 101-Upper chuck of creep testing machine; 102-Lower chuck of creep testing machine; 201-Flat washer; 202-Elastic washer. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings and exemplary embodiments thereof. It should be noted that the following detailed description of the present invention is for illustrative purposes only and is not intended to limit the scope of the invention.

[0027] It should be noted that, in the context of this utility model, the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and 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 this utility model.

[0028] Furthermore, terms such as "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0029] Reference Figures 1 to 3 The apparatus for hydrogen embrittlement resistance testing of elastic washers, as an exemplary embodiment of the present invention, includes an upper pull rod assembly, a lower pull rod assembly, a first set of connecting pull rods, a second set of connecting pull rods, and multiple sets of positioning pins and washers.

[0030] The upper pull rod assembly includes an upper pull rod connecting plate 11 and an upper pull rod support plate 12. The upper pull rod connecting plate 11 is used to connect to the upper clamp 101 of the creep testing machine. The upper pull rod connecting plate 11 and the upper pull rod support plate 12 are arranged parallel to each other vertically and are fixedly connected by a first set of connecting pull rods. In some embodiments, the first set of connecting pull rods consists of multiple first connecting pull rods 3 (such as...). Figure 3 The first connecting rod 3 consists of two rods (as shown in the diagram) and multiple hexagonal nuts 7. The two ends of the first connecting rod 3 pass through corresponding through holes or threaded holes on the upper connecting rod connecting plate 11 and the upper connecting rod support plate 12, and are then locked by the hexagonal nuts 7, thereby fixing the upper connecting rod connecting plate 11 and the upper connecting rod support plate 12 into a stable whole. As an example and not a limitation, the number of first connecting rods 3 is two, and they are symmetrically arranged about the central axis of the disc-shaped upper connecting rod connecting plate 11 and the upper connecting rod support plate 12.

[0031] The pull rod assembly includes a pull rod pressure plate 21 and a pull rod connecting plate 22. The pull rod connecting plate 22 is used to connect to the lower clamp 102 of the creep testing machine. The pull rod connecting plate 22 and the pull rod pressure plate 21 are arranged parallel to each other vertically and are fixedly connected by a second set of connecting rods. In some embodiments, the second set of connecting rods consists of multiple second connecting rods 4 (such as...). Figure 1 and Figure 2 The assembly consists of a plurality of hexagonal nuts 7, as shown in the diagram, and is connected in the same manner as the upper pull rod assembly. The number of second connecting pull rods 4 is exemplarily two, and they are arranged symmetrically about the central axis of the disc-shaped lower pull rod pressure plate 21 and the lower pull rod connecting plate 22.

[0032] Both the upper tie rod connecting plate 11 and the lower tie rod connecting plate 22 are equipped with equipment connecting bolts 8, which are used to firmly connect with the upper clamp 101 and the lower clamp 102 of the creep test machine, respectively, so that the entire device can be installed on the test machine.

[0033] To achieve internal loading and ensure load stability, the lower pull rod pressure plate 21 is slidably mounted on the first set of connecting rods, and the upper pull rod support plate 12 is slidably mounted on the second set of connecting rods. The upper pull rod support plate 12 and the lower pull rod pressure plate 21 are located between the upper pull rod connecting plate 11 and the lower pull rod connecting plate 22, and are positioned vertically opposite each other, allowing them to slide freely along the axial direction of the connecting rods 3 or 4. Specifically, the central axes of each plate are coaxial, and the connecting rods 3 and 4 are evenly distributed around the central axis of each plate. This design ensures that when the creep testing machine drives the upper pull rod connecting plate 11 and the lower pull rod connecting plate 22 to move relative to each other, the upper pull rod support plate 12 and the lower pull rod pressure plate 21 will experience relative displacement, remaining parallel during the relative movement.

[0034] To accommodate and test elastic washers of different sizes, this invention provides multiple sets of locating pins and washers, each set including one locating pin 5 and one washer 6. Specifically, the multiple sets of locating pins and washers may include several sets of spring washer locating pins and spring washer washers for spring washers, and several sets of saddle washer locating pins and saddle washer washers for saddle washers. The locating pins of different sets have different diameters, and the matching washers also have center holes of different diameters to accommodate spring washers or saddle washers with different inner diameters. During testing, the appropriate locating pin and washer are selected according to the type and size of the elastic washer being tested.

[0035] The positioning pin 5 is detachably and vertically mounted on one of the upper pull rod support plate 12 and the lower pull rod pressure plate 21. In a specific embodiment of this utility model, one end of the positioning pin 5 is provided with a head for limiting, and the upper pull rod support plate 12 or the lower pull rod pressure plate 21 is provided with a positioning hole that mates with the head. The positioning pin 5 achieves axial limiting by mounting its head in the positioning hole. The positioning pin 5 is used to fit the elastic washer 202 to be tested. The washer 6 is detachably fitted on the end of the positioning pin 5 opposite to its mounting end, i.e., the free end, and interacts with the other of the upper pull rod support plate 12 and the lower pull rod pressure plate 21 to apply an axial load to the elastic washer under test.

[0036] In a specific embodiment of this utility model, the washer 6 has a large-diameter section and a small-diameter section. The small-diameter section is used to extend into a mating hole, such as a center hole, on the other of the upper pull rod support plate 12 and the lower pull rod pressure plate 21. The large-diameter section is a bearing end, used to press against the outermost elastic washer or flat washer on the locating pin 5. One axial end face of the large-diameter section is used to contact the other of the upper pull rod support plate 12 and the lower pull rod pressure plate 21 for being limited, and the other axial end face is used to press against the washer. It should be understood that the elastic washer 202 used for testing is located between the large-diameter section of the washer 6 and the limiting head of the locating pin 5. With this structure, when the lower pull rod pressure plate 21 and the upper pull rod support plate 12 are relatively displaced, the other of the lower pull rod pressure plate 21 and the upper pull rod support plate 12 will press against the circumferential end face of the large diameter section of the washer 6, and then the applied force will be transmitted to the elastic washer 202 sleeved on the positioning pin 5 through the large diameter section of the washer 6, thereby achieving precise axial loading of the elastic washer 202.

[0037] According to this utility model, when multiple elastic washers need to be tested simultaneously, multiple flat washers 201 and elastic washers 202 can be alternately threaded onto the positioning pin 5 (the flat washers do not need to be tested, but are only used to separate the elastic washers), and finally the corresponding washers 6 are put on, so that multiple elastic washers can be tested for hydrogen embrittlement resistance at one time, and batch testing can be achieved.

[0038] Preferably, the upper tie rod connecting plate 11, upper tie rod support plate 12, lower tie rod pressure plate 21, and lower tie rod connecting plate 22 are all made of 30CrMnSiA structural steel to ensure sufficient structural strength and flatness. The first set of connecting rods and the second set of connecting rods are both made of 40Cr steel to ensure sufficient strength and wear resistance. All structural components can be bluing to ensure surface rust prevention.

[0039] Furthermore, the threaded holes on the upper pull rod connecting plate 11, upper pull rod support plate 12, lower pull rod pressure plate 21, and lower pull rod connecting plate 22 in this device can be of the same size to facilitate processing and assembly.

[0040] The working principle of this utility model is as follows:

[0041] First, pass the connecting bolts 8 through the center holes of the upper pull rod connecting plate 11 and the lower pull rod connecting plate 22, respectively, and connect them to the upper and lower clamps of the creep testing machine. Select appropriate locating pins 5 and washers 6 according to the type and size of the elastic washer to be tested. Install the locating pin on one of the upper pull rod support plate 12 and the lower pull rod pressure plate 21. Then, alternately insert the elastic washer 202 and the flat washer 201 into the locating pin 5, and place the washer 6 on the end of the locating pin, so that the large-diameter section of the washer 6 presses against the outermost washer. Adjust the testing machine so that the small-diameter section of the washer 6 enters the mating hole of the other of the upper pull rod support plate 12 and the lower pull rod pressure plate 21. Precisely control the relative displacement of the upper and lower clamps using the creep testing machine, and simultaneously monitor the loading force value through the machine's force sensor to apply the predetermined test load.

[0042] When the creep testing machine drives the upper and lower tie rod connecting plates to move relative to each other and applies a predetermined load, the entire device forms a stable, rigid load-bearing frame through the reliable locking of the connecting rods and hexagonal nuts, and the tight fit between the components. The large-diameter section of the washer directly presses against the elastic washer, ensuring effective load transfer; the small-diameter section mates with the mating hole of the opposite plate to ensure load coaxiality. The axial end face of the large-diameter section of the washer contacts the plate to achieve reliable limiting, ensuring a clear load transfer path. This structural design effectively resists stress relaxation and structural deformation during the test, ensuring that the test load applied to the elastic washer remains accurate and constant throughout the entire test cycle. Simultaneously, the precise fit between the mating hole and the locating pin effectively avoids test errors caused by off-center loading, further ensuring the accuracy and reliability of the test results.

[0043] Finally, it should be noted that the features mentioned and / or shown in the above description of exemplary embodiments of the present invention can be combined in the same or similar manner with one or more other embodiments, combined with features in other embodiments, or substituted for corresponding features in other embodiments. These combined or substituted technical solutions should also be considered as included within the protection scope of the present invention.

Claims

1. An apparatus for testing the hydrogen embrittlement resistance of elastic washers, characterized in that: Includes an upper pull rod assembly, a lower pull rod assembly, a first set of connecting pull rods, a second set of connecting pull rods, and multiple sets of locating pins and washers; The upper pull rod assembly includes an upper pull rod connecting plate and an upper pull rod support plate. The upper pull rod connecting plate and the upper pull rod support plate are arranged parallel to each other at intervals and are fixedly connected by the first set of connecting pull rods. The pull rod assembly includes a pull rod connecting plate and a pull rod pressure plate. The pull rod connecting plate and the pull rod pressure plate are arranged parallel to each other at intervals and are fixedly connected by the second set of connecting rods. The upper pull rod connecting plate and the lower pull rod connecting plate are respectively used to connect with the upper and lower clamps of the creep testing machine; the lower pull rod pressure plate is slidably mounted on the first set of connecting pull rods, and the upper pull rod support plate is slidably mounted on the second set of connecting pull rods, so that the upper pull rod support plate and the lower pull rod pressure plate are located between the upper pull rod connecting plate and the lower pull rod connecting plate and are arranged vertically opposite each other, so that when the upper pull rod connecting plate and the lower pull rod connecting plate are driven to move relative to each other, the upper pull rod support plate and the lower pull rod pressure plate will generate relative displacement; The multiple sets of locating pins and washers are used to accommodate elastic washers of different sizes. Each set includes one locating pin and one washer. The locating pin is detachably and vertically mounted on one of the upper pull rod support plate and the lower pull rod pressure plate for mounting the elastic washer to be tested. The washer is detachably mounted on the end of the locating pin opposite to its mounting end and interacts with the other of the upper pull rod support plate and the lower pull rod pressure plate to transfer the force applied by the lower pull rod pressure plate or the upper pull rod support plate to the elastic washer mounted on the locating pin, thereby applying an axial load to the elastic washer.

2. The apparatus according to claim 1, characterized in that: In the multiple sets of locating pins and washers, the locating pins of different sets have different diameters, and the washers that match them have different diameter center holes, so as to adapt to elastic washers with different inner diameters respectively.

3. The apparatus according to claim 1 or 2, characterized in that: The washer has a large diameter section and a small diameter section. The small diameter section is used to extend into a mating hole on the other of the upper pull rod support plate and the lower pull rod pressure plate. The large diameter section is used to press against the elastic washer. One axial end face of the large diameter section is used to contact the other of the upper pull rod support plate and the lower pull rod pressure plate for being limited, and the other axial end face is used to press against the elastic washer.

4. The apparatus according to claim 1 or 2, characterized in that: One end of the positioning pin is provided with a limiting head, and one of the upper pull rod support plate and the lower pull rod pressure plate is provided with a positioning hole that cooperates with the limiting head. The positioning pin is installed in the positioning hole through the limiting head to achieve the limiting.

5. The apparatus according to claim 1 or 2, characterized in that: Both the first and second sets of connecting rods consist of a rod and a hexagonal nut. The upper rod connecting plate, the upper rod support plate, the lower rod pressure plate, and the lower rod connecting plate are each provided with a through hole or threaded hole for the rod to pass through, and are locked and fixed by the hexagonal nut.

6. The apparatus according to claim 1 or 2, characterized in that: Both the upper and lower pull rod connecting plates are equipped with equipment connecting bolts for connecting to the upper and lower clamps of the creep testing machine.

7. The apparatus according to claim 1 or 2, characterized in that: The upper tie rod connecting plate, upper tie rod support plate, lower tie rod pressure plate, and lower tie rod connecting plate are all made of 30CrMnSiA structural steel, and the first set of connecting rods and the second set of connecting rods are both made of 40Cr steel.

8. The apparatus according to claim 1 or 2, characterized in that: The device can simultaneously install multiple positioning pins, and multiple elastic washers and flat washers can be alternately fitted on each positioning pin to achieve a hydrogen embrittlement resistance test on multiple elastic washers at one time.

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