A metal tensile testing device simulating a corrosive environment

Abstract

The utility model relates to a kind of metal tensile test device of simulated corrosion environment, including rack rack inside two sides respectively symmetrically set with mutually matched sealing cavity mechanism, sealing cavity mechanism includes linear module, drive cylinder and sealing cover, linear module is respectively longitudinally set on the inner wall of rack two sides, the slider in linear module is horizontally provided with mounting sleeve, drive cylinder is fixedly set in mounting sleeve, the piston rod one end of drive cylinder is connected with a sealing cover by elastic support rod, the sealing cover in the sealing cavity mechanism of two mutually abuts and cover is set in the middle part of metal sample under the drive of drive cylinder, to form a closed chamber, the upper and lower ends of sealing cover are respectively connected with air inlet pipe and air exhaust pipe by joint, the air inlet pipe and air exhaust pipe are respectively connected with gas supply source and negative pressure gas source by switch valve, suction in closed chamber by negative pressure, again inject hydrogen by gas supply source, meet the demand of metal tensile test under corrosion environment.

Description

Technical Field

[0001] This utility model relates to the technical field of metal tensile testing devices, and in particular to a metal tensile testing device that simulates a corrosive environment. Background Technology

[0002] A corrosion testing device for metallic materials under stress is suitable for studying the corrosion process of metallic materials under the combined action of stress and corrosive media. Hydrogen, especially high-pressure hydrogen, poses a unique corrosion risk to metallic materials. Due to its extremely small atomic radius, hydrogen can easily penetrate the microstructure of metals. Under high pressure, hydrogen atoms invade the metal matrix and preferentially accumulate at defects such as microcracks, leading to accelerated crack propagation. More seriously, hydrogen may react with carbon in steel to produce methane, causing material decarburization and performance degradation, ultimately resulting in cracking. Therefore, when manufacturing metallic material products that come into contact with high-pressure hydrogen, it is necessary to verify the tensile properties of the metal materials used in the product under high-pressure hydrogen environment. Existing technology: CN202210258986.7 discloses a hydrogen environment mechanical testing device and its testing method. This application sets up a transparent chamber at the position of two clamps, and supplies hydrogen to the transparent chamber through a hydrogen supply system to achieve the required hydrogen environment, thereby detecting the changes in the mechanical property indicators of various metals under hydrogen environment. The transparent chamber in this application has a simple structure and no corresponding opening and closing mechanism, which makes it inconvenient to load and unload test metal materials, and also cannot fully guarantee the airtightness of the chamber. Utility Model Content

[0003] To address the aforementioned problems, this invention discloses a metal tensile testing device that simulates a corrosive environment, thus solving the problem that existing metal tensile testing devices cannot effectively simulate corrosive environments.

[0004] The specific technical solution is as follows:

[0005] A metal tensile testing device simulating a corrosive environment includes a frame. A fixed crossbeam is installed at the upper end of the frame, and a lifting crossbeam is installed at the lower end of the frame. The lifting crossbeam is driven to rise and fall at both ends by a lifting drive mechanism installed on the frame. Clamp assemblies for fixing the two ends of the metal sample are respectively installed at the top of the lifting crossbeam and the bottom of the fixed crossbeam. Symmetrically arranged on both sides of the frame are mutually cooperating sealing cavity mechanisms. Each sealing cavity mechanism includes a linear module, a drive cylinder, and a sealing cover. The linear module is longitudinally arranged on the inner wall of both sides of the frame. A mounting sleeve is horizontally installed on the slider of the linear module. The drive cylinder is horizontally fixed in the mounting sleeve. One end of the piston rod of the drive cylinder is connected to a sealing cover through an elastic support rod. The sealing covers in the two sealing cavity mechanisms abut against each other under the drive of the drive cylinder and cover the middle of the metal sample, thereby forming a sealed chamber.

[0006] The two sealing covers have openings on adjacent sides. Each of the two sealing covers has a sealing strip on its opening side. The two sealing covers abut against each other through the sealing strips, ensuring a seal between the sides. The upper and lower ends of the opening side of each sealing cover have mounting grooves. Insert plates are detachably installed in each mounting groove. One end of each insert plate has a concave groove that matches the size and shape of the side wall of the metal sample. The concave grooves on the two insert plates fit together and are fitted onto the side wall of the metal sample. The inner wall of the concave groove has a sealing strip for pressing against the side wall of the metal sample. The two ends of the sealing strip extend to the side end face of the insert plate and fit against the end of the sealing strip.

[0007] Furthermore, one of the sealing covers has an air inlet pipe and an air extraction pipe connected to its upper and lower ends via connectors, and the air inlet pipe and the air extraction pipe are respectively connected to an air supply source and a negative pressure air source via switching valves.

[0008] Furthermore, the mounting sleeve is provided with side plates on both sides, and a guide rod is horizontally and slidably arranged on the side plate. One end of the guide rod is fixedly connected to the side wall of the sealing cover to guide the sealing cover.

[0009] Furthermore, both the mounting groove and the insert plate are trapezoidal in shape and have the same size. The inner wall of the mounting groove is provided with a recess, and the other three side walls of the insert plate are provided with protruding edges for embedding into the recess, so as to realize the installation and fixation of the insert plate.

[0010] Furthermore, a sealing strip is embedded in the groove.

[0011] Furthermore, the two linear modules are driven by servo motors, and the two servo motors are controlled by the same controller to achieve synchronous operation.

[0012] The beneficial effects of this utility model are reflected in:

[0013] (1) In this utility model, two sealing covers distributed on the left and right abut each other to form a closed chamber that is fitted onto the metal sample. Then, the closed chamber is first drawn by negative pressure, and then hydrogen is injected into it through the gas supply source, so as to meet the requirements of metal tensile testing under corrosive environment.

[0014] (2) When the two sealing covers come into contact, the sealing covers are sealed by the sealing strips on their opening sides pressing against each other. At the same time, the upper and lower ends of the sealing covers are sealed by the sealing strips on the insert plates and the metal sample surface, thus effectively ensuring the airtightness of the sealed chamber. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a side sectional view of the sealing cover in this utility model.

[0017] Figure 3 This is a schematic diagram of the structure between the two sealing covers and the metal sample in this utility model.

[0018] Figure 4 This is a schematic diagram of the structure after the insert plate and the sealing cover are separated in one embodiment of this utility model.

[0019] Figure 5 This is a schematic diagram of the structure after the insert plate and the sealing cover are separated in another embodiment of the present invention.

[0020] Explanation of reference numerals in the attached drawings: Frame 1, Fixed crossbeam 11, Lifting crossbeam 12, Clamp assembly 13, Metal sample 14, Linear module 2, Mounting sleeve 21, Side plate 22, Drive cylinder 3, Elastic support rod 31, Sealing cover 4, Guide rod 41, Sealing strip one 42, Mounting groove 43, Groove 431, Insert plate 44, Concave groove 441, Slot 442, Protruding edge 443, Sealing strip two 45, Air inlet pipe 46, Air extraction pipe 47. Detailed Implementation

[0021] To make the technical solution of this utility model clearer and more explicit, the utility model will be further described below with reference to the accompanying drawings. Any solution derived by equivalent substitution and conventional reasoning of the technical features of this utility model falls within the protection scope of this utility model. The fixed connections and fixed settings mentioned in this utility model are all common connection methods in the mechanical field, including welding, bolt and nut connections, and screw connections.

[0022] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" 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.

[0023] Please see the appendix Figure 1-5This embodiment provides a metal tensile testing device simulating a corrosive environment, including a frame 1. A fixed crossbeam 11 is provided at the upper end of the frame 1, and a lifting crossbeam 12 is provided at the lower end of the frame 1. The lifting crossbeam 12 is driven to rise and fall at both ends by a lifting drive mechanism provided on the frame 1. Clamp assemblies 13 for fixing the two ends of the metal sample 14 are respectively provided at the top of the lifting crossbeam 12 and the bottom of the fixed crossbeam 11. A sealing cavity mechanism is symmetrically arranged on both sides of the frame 1, and the sealing cavity mechanism includes a linear module 2, a drive cylinder 3, and a sealing cover 4. The linear module 2 is longitudinally arranged on the inner wall of both sides of the frame 1. A mounting sleeve 21 is horizontally arranged on the slider in the linear module 2. The drive cylinder 3 is horizontally fixed in the mounting sleeve 21. One end of the piston rod of the drive cylinder 3 is connected to a sealing cover 4 through an elastic support rod 31. The two sealing covers are open on adjacent sides and are used to abut and seal each other. The elastic support rod 31 can prevent the two sealing covers from being rigidly connected and causing damage. The sealing covers 4 in the two sealing cavity mechanisms abut against each other and cover the middle of the metal sample under the drive of the drive cylinder 3, thereby forming a sealed chamber for injecting hydrogen gas to simulate a corrosive environment.

[0024] Each of the two sealing covers 4 has a sealing strip 42 on one end face of its opening side. The two sealing covers 4 abut against each other on their opening sides, ensuring a seal through the mutual pressure of the sealing strips 42. Each of the upper and lower ends of the opening side of the sealing cover 4 has a mounting groove 43, in which a detachable insert plate 44 is installed. One end of each insert plate 44 has a concave groove 441, which is semi-circular or rectangular. When the concave grooves 441 on the two insert plates 44 mate... When fully fitted onto the sidewall of the metal sample 14, the two concave grooves fit together to form a complete circle or rectangle to accommodate the outer wall of the metal sample 14. A detachable structure is employed to facilitate the replacement of insert plates 44 with different concave grooves 441 to accommodate metal samples 14 of different structural dimensions. The inner wall of the concave groove 441 is provided with a second sealing strip 45 for pressing against the sidewall of the metal sample 14. Both ends of the second sealing strip 45 extend to the side end face of the insert plate 44 and abut against the end of the first sealing strip. After the two sealing covers 4 abut against each other, the second sealing strip 45 is deformed and elongated by the pressure of the metal sample, thereby eliminating the gap between the two second sealing strips 45 and the small gap between the end of the first sealing strip 42 and the end of the second sealing strip 45, thus ensuring a sealing effect.

[0025] In this embodiment, slots 442 are provided on the side end face of the opening of the sealing cover 4 and the side end face of the insert plate 44 for installing sealing strips respectively.

[0026] In this embodiment, the upper and lower ends of one of the sealing covers 4 are respectively connected to an air inlet pipe 46 and an air extraction pipe 47 via connectors. The air inlet pipe 46 and the air extraction pipe 47 are respectively connected to an air supply source and a negative pressure air source via electromagnetic switch valves. The two electromagnetic switch valves are opened sequentially by a PLC controller, thereby realizing the extraction, supply, and exhaust of air from the sealed chamber after the test.

[0027] In this embodiment, the mounting sleeve 21 is provided with side plates 22 on both sides, and a guide rod 41 is horizontally and slidably arranged on the side plate 22. One end of the guide rod 41 is fixedly connected to the side wall of the sealing cover 4 to guide the sealing cover 4 and ensure that the two sealing covers 4 can be accurately connected.

[0028] In this embodiment, both the mounting groove 43 and the insert plate 44 are isosceles trapezoidal structures with the same dimensions. The inner wall of the mounting groove 43 is provided with a recess 431, into which a sealing strip is embedded. The other three side walls of the insert plate are provided with protruding edges 443 for embedding into the recess 431, thus achieving the installation and fixation of the insert plate 44. After installation, the two sealing covers 4 abut against each other, causing the insert plate 44 to press against the metal sample 14. Due to the isosceles trapezoidal structure of the insert plate 44, under pressure, one end and both sides of the protruding edges 443 compress the sealing strip, thereby ensuring the sealing of the mounting groove 43 and preventing leakage.

[0029] In this embodiment, the two linear modules 2 are driven by servo motors, and the two servo motors are controlled by the same PLC controller to achieve synchronous operation. When clamping metal samples 14 of different lengths and adjusting their height, the PLC controller sends a signal to control the two servo motors to operate synchronously, thereby ensuring that the positions of the two sealing covers 4 can always remain corresponding and avoiding misalignment.

[0030] The above description is merely a preferred embodiment of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A metal tensile testing apparatus simulating a corrosive environment, comprising a frame (1), a fixed crossbeam (11) disposed at the upper end of the frame, and a lifting crossbeam (12) disposed at the lower end of the frame, the lifting crossbeam (12) being driven to rise and fall at both ends by a lifting drive mechanism disposed on the frame, and clamp assemblies (13) for fixing both ends of a metal specimen (14) being respectively disposed at the top of the lifting crossbeam (12) and the bottom of the fixed crossbeam (11); characterized in that, The frame (1) is symmetrically provided with mutually cooperating sealing cavity mechanisms on both sides. The sealing cavity mechanism includes a linear module (2), a drive cylinder (3) and a sealing cover (4). The linear module (2) is longitudinally arranged on the inner wall of both sides of the frame (1). The slider in the linear module is horizontally provided with an installation sleeve (21). The drive cylinder (3) is horizontally fixed in the installation sleeve (21). One end of the piston rod of the drive cylinder (3) is connected to a sealing cover (4) through an elastic support rod (31). The sealing covers (4) in the two sealing cavity mechanisms abut against each other under the drive of the drive cylinder (3) and cover the middle of the metal sample (14), thereby forming a sealed chamber. The two sealing covers (4) are open on one side of each other. Each of the two sealing covers (4) is provided with a sealing strip (42) on the end face of the opening side. The two sealing covers (4) abut against each other on the opening side, so that the sides of the sealing covers (4) are pressed against each other by the sealing strip (42) to ensure sealing. The upper and lower ends of the opening side of the sealing cover (4) are provided with mounting grooves (43). Insert plates (44) are detachably provided in the mounting grooves. One end of the insert plate (44) is provided with a concave groove (441) that matches the size and shape of the side wall of the metal sample (14). The concave grooves on the two insert plates (44) are fitted together and sleeved on the side wall of the metal sample. The inner wall of the concave groove (441) is provided with a sealing strip (45) for pressing against the side wall of the metal sample. The two ends of the sealing strip (45) extend to the side end face of the insert plate (44) and fit against the end of the sealing strip (42).

2. The metal tensile testing apparatus for simulating a corrosive environment as described in claim 1, characterized in that, One of the sealing covers (4) has an air inlet pipe (46) and an air extraction pipe (47) connected to its upper and lower ends via connectors. The air inlet pipe (46) and the air extraction pipe (47) are connected to an air supply source and a negative pressure air source via switching valves, respectively.

3. The metal tensile testing apparatus for simulating a corrosive environment as described in claim 1, characterized in that, The mounting sleeve (21) has side plates (22) on both sides. A guide rod (41) is horizontally and slidably arranged on the side plate (22). One end of the guide rod (41) is fixedly connected to the side wall of the sealing cover (4) to guide the sealing cover (4).

4. The metal tensile testing apparatus for simulating a corrosive environment as described in claim 1, characterized in that, The mounting groove (43) and the insert plate (44) are both trapezoidal in shape and have the same size. The inner wall of the mounting groove (43) is provided with a groove (431). The other three side walls of the insert plate (44) are provided with protruding edges (443) for embedding into the groove (431) to realize the installation and fixation of the insert plate (44).

5. The metal tensile testing apparatus for simulating a corrosive environment as described in claim 4, characterized in that, A sealing strip is embedded in the groove (431).

6. The metal tensile testing apparatus for simulating a corrosive environment as described in claim 1, characterized in that, The two linear modules (2) are driven by servo motors respectively, and the two servo motors are controlled by the same controller to achieve synchronous operation.

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