Stress corrosion fatigue test clamp capable of controlling temperature by solution

Abstract

The utility model relates to a stress corrosion fatigue test fixture capable of controlling the temperature by a solution, and belongs to the field of test fixtures. The structure comprises an upper clamp rod (1) and a lower clamp rod (8) which are vertically arranged at an interval, the opposite ends of the upper clamp rod (1) and the lower clamp rod (8) are provided with wedge-shaped sliding block clamping assemblies (5) used for clamping a sample (4), the middle of the lower clamp rod (8) is sleeved with an acrylic solution pool (6), and the outer side of the lower clamp rod (8) is connected with the bottom plate side of the acrylic solution pool (6) in a sealed mode. And a temperature control unit (10) for heating the solution is arranged in the acrylic solution tank (6). According to the structure, the sample (4) can be rapidly clamped through the wedge-shaped sliding block clamping assembly (5), the temperature control unit (10) can achieve the accurate temperature of corrosive liquid, the corrosion effects at different temperatures are simulated, and the accuracy of experimental data is guaranteed. The problem that existing equipment can only simulate a basic corrosion environment and cannot realize a high-precision or specific temperature test scene is solved.

Description

Technical Field

[0001] This utility model relates to a stress corrosion fatigue test fixture with solution temperature control, belonging to the field of test fixtures. Background Technology

[0002] Stress corrosion fatigue is a phenomenon of material failure caused by the combined effects of mechanical stress and a corrosive environment. Its severity has attracted much attention in aerospace, energy, chemical and other fields. Although traditional stress corrosion fatigue testing equipment can simulate basic corrosive environments, it has significant shortcomings in terms of temperature control accuracy and experimental adaptability. In particular, existing equipment is difficult to meet the requirements of testing scenarios involving high precision or specific temperature requirements.

[0003] Temperature is a crucial parameter affecting the corrosion process; different temperature conditions can significantly alter the corrosion behavior and fatigue properties of materials. For example, in tests simulating human body environments, it is typically necessary to precisely control the solution temperature within a range close to body temperature, around 35°C. However, existing testing equipment struggles to provide stable and accurate temperature control capabilities. Furthermore, testing in high-temperature corrosive environments, such as the service conditions of petrochemical equipment, demands even more stringent experimental requirements, further highlighting the limitations of current technologies.

[0004] Existing stress corrosion fatigue testing fixtures are typically used to simulate the fatigue performance of materials under specific environments, but existing devices have limitations in liquid temperature control. Temperature is a crucial factor affecting corrosion rate and fatigue performance, especially for experiments simulating human body environments or high-temperature environments, where precise temperature control is paramount. Therefore, designing a stress corrosion fatigue testing fixture with liquid temperature control functionality is essential. Utility Model Content

[0005] The technical problem to be solved by this invention is that existing equipment can only simulate basic corrosive environments and cannot achieve high-precision or specific temperature testing scenarios.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a stress corrosion fatigue test fixture with solution temperature control, including an upper clamp rod and a lower clamp rod arranged at intervals. The upper clamp rod and the lower clamp rod are provided with wedge-shaped slider clamping components for clamping the sample at their opposite ends. An acrylic solution pool is sleeved in the middle of the lower clamp rod, and the outer side of the lower clamp rod is sealed to the bottom plate side of the acrylic solution pool. A temperature control unit for heating the solution is provided inside the acrylic solution pool.

[0007] The structure also includes a controller and a display. The controller and the temperature control unit are located outside the acrylic solution pool and are electrically connected to the temperature control unit.

[0008] The outer wall of the acrylic solution pool in the above structure is covered with a layer of heat-insulating cotton.

[0009] In the above structure, a cover plate is provided at the upper opening of the acrylic solution pool, and the upper clamping rod extends through the cover plate into the acrylic solution pool.

[0010] Furthermore, the cover plate in the above structure is magnetically connected to the upper end of the acrylic solution pool.

[0011] In the above structure, the outer wall of the middle part of the lower clamp rod is provided with external threads, the bottom plate of the lower end of the acrylic solution pool is provided with a matching through hole, and the middle part of the lower clamp rod is fitted with a matching sealing nut, and the sealing nut is located on the upper and lower sides of the bottom plate of the lower end of the acrylic solution pool.

[0012] Furthermore, the above structure also includes a magnetic sealing washer, which is sleeved on the lower clamp rod and located between the sealing nut and the bottom plate of the acrylic solution pool.

[0013] The wedge-shaped slider clamping assembly described above includes a base, a slider, a fixing block, and a double-ended screw. The base has a wedge-shaped groove, the slider is adapted to the groove and symmetrically arranged in the groove, the fixing block is located at the end of the slider away from the groove, and a V-shaped clamping opening is provided at the opposite end of the fixing block, the double-ended screw is mounted in the groove and rotatably connected to the base, and the threads at both ends of the double-ended screw have opposite directions, the slider has a matching threaded hole through it and is sleeved on the double-ended screw.

[0014] Furthermore, in the above structure, a support seat is provided in the middle of the slide groove, and the middle of the double-headed screw is rotatably mounted on the support seat.

[0015] Furthermore, the double-ended screw in the above structure is provided with a turning part at both ends.

[0016] The beneficial effects of this invention are as follows: By adding a liquid temperature control system, this structure achieves precise adjustment and real-time monitoring of the temperature of the corrosive solution, filling the gap in temperature control functionality of existing devices. This improvement not only meets the temperature control requirements under various experimental conditions but also provides more reliable experimental data support for material research and development and quality control. This structure can precisely adjust the temperature of the corrosive liquid to meet the needs of specific experimental conditions, ensuring the reliability and repeatability of experimental data, and is applicable to various corrosive liquids and experimental environments. In new material development, precise temperature control to simulate specific corrosive environments helps evaluate the service performance of materials; in production quality control, it can be used to test the corrosion resistance of materials, improving product quality. Furthermore, this structure is standardized and modular, suitable for promotion both domestically and internationally, especially for laboratories with high requirements, and has a broad market prospect. Additionally, wedge-shaped slider clamping components are set at the opposite ends of the upper and lower clamping rods, enabling rapid sample clamping and improving clamping efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the wedge-shaped slider clamping assembly of this utility model;

[0019] Figure 3 This is a utility model Figure 2 Top view of the structure;

[0020] Figure 4 This is a schematic diagram of the connection structure between the wedge-shaped slider clamping assembly and the upper clamping rod of this utility model;

[0021] Figure 5 This is a schematic diagram of the connection structure between the wedge-shaped slider clamping assembly and the lower clamping rod of this utility model.

[0022] Marked in the image:

[0023] 1. Upper clamping rod; 2. Cover plate; 3. Insulation cotton layer; 4. Sample; 5. Wedge-shaped slider clamping assembly; 51. Base; 52. Fixing block; 53. Double-ended screw; 54. Slider; 55. Support base; 6. Acrylic solution pool; 7. Sealing nut; 8. Lower clamping rod; 9. Magnetic sealing gasket; 10. Temperature control unit; 11. Display; 12. Controller. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] like Figures 1 to 5As shown, this utility model discloses a solution-controlled temperature stress corrosion fatigue testing fixture, comprising an upper clamping rod 1 and a lower clamping rod 8 spaced apart vertically. A wedge-shaped slider clamping assembly 5 for clamping a sample 4 is positioned at the opposite ends of the upper clamping rod 1 and the lower clamping rod 8. An acrylic solution pool 6 is fitted into the middle of the lower clamping rod 8, and the outer side of the lower clamping rod 8 is sealed to the bottom plate side of the acrylic solution pool 6. A temperature control unit 10 for heating the solution is installed inside the acrylic solution pool 6. Those skilled in the art will understand that the upper clamping rod 1 and the lower clamping rod 8 of this structure can be directly connected and fixed to the testing machine fixture. The wedge-shaped slider clamping assembly 5, positioned at the opposite ends of the upper clamping rod 1 and the lower clamping rod 8, allows for rapid clamping of the sample 4. An acrylic solution pool 6 is fitted into the middle of the lower clamp rod 8. The corrosive solution can be poured directly into the acrylic solution pool 6, keeping the sample 4 submerged and ensuring the accuracy of the test data. Preferably, the outer side of the lower clamp rod 8 is sealed to the bottom plate of the acrylic solution pool 6 to prevent leakage. Simultaneously, this structure preferably embeds a temperature control unit 10 into the bottom of the solution pool. The temperature control unit 10 integrates a temperature sensor and a heating element, enabling precise temperature control of the solution to meet the needs of specific experimental conditions, ensuring the reliability and repeatability of experimental data. It is also suitable for various corrosive liquids and experimental environments.

[0026] Preferably, the above structure further includes a controller 12 and a display 11. The controller 12 and the temperature control unit 10 are disposed outside the acrylic solution pool 6 and electrically connected to the temperature control unit 10. Those skilled in the art will understand that, in order to achieve precise automatic temperature control, this structure preferably also includes a controller 12 and a display 11. The controller 12 monitors and displays the temperature in real time and is easy to operate. The display 11 is electrically connected to the temperature sensor of the temperature control unit 10 and can display the solution temperature in real time. Preferably, the temperature control accuracy is controlled within ±1℃ to meet experimental requirements.

[0027] Preferably, the outer wall of the acrylic solution pool 6 in the above structure is covered with a thermal insulation layer 3. Those skilled in the art will understand that, in order to further ensure a constant temperature inside the acrylic solution pool 6, this structure preferably covers the outer wall of the acrylic solution pool 6 with a thermal insulation layer 3, thereby achieving thermal insulation of the acrylic solution pool 6.

[0028] Preferably, in the above structure, a cover plate 2 is provided at the upper opening of the acrylic solution pool 6, and the upper clamping rod 1 extends through the cover plate 2 into the acrylic solution pool 6. Those skilled in the art will understand that this structure further provides a cover plate 2 at the upper opening of the acrylic solution pool 6 to seal the upper opening of the acrylic solution pool 6, thereby achieving the purpose of heat preservation. For ease of connection, the upper clamping rod 1 actually extends through the cover plate 2 into the acrylic solution pool 6, and the side of the upper clamping rod 1 that penetrates should be sealed to the cover plate 2. Insulation cotton layer 3 can also be wrapped around the cover plate 2.

[0029] Preferably, in the above structure, the cover plate 2 is magnetically connected to the upper end of the acrylic solution tank 6. Those skilled in the art will understand that, for ease of installation and sealing of the cover plate 2, this structure preferably uses a magnetic connection between the cover plate 2 and the upper end of the acrylic solution tank 6. Specifically, a magnet block or magnet strip can be embedded in the cover plate 2, and a metal layer can be provided at the upper end of the acrylic solution tank 6 to achieve a magnetic seal between the cover plate 2 and the acrylic solution tank 6, facilitating liquid addition and cleaning operations.

[0030] Preferably, in the above structure, the outer wall of the lower clamp rod 8 is provided with an external thread, the bottom plate of the acrylic solution pool 6 is provided with a matching through hole, and a matching sealing nut 7 is sleeved on the middle of the lower clamp rod 8, with the sealing nut 7 located on the upper and lower sides of the bottom plate of the acrylic solution pool 6. Those skilled in the art will understand that, in order to ensure a sealed connection between the lower clamp rod 8 and the bottom plate of the acrylic solution pool 6, this structure preferably has an external thread on the outer wall of the middle of the lower clamp rod 8, and a matching through hole is provided on the bottom plate of the lower acrylic solution pool 6. Alternatively, the through hole can preferably be a threaded hole. A matching sealing nut 7 is screwed onto the middle of the lower clamp rod 8, and the sealing nut 7 is located on the upper and lower sides of the bottom plate of the acrylic solution pool 6. Since the sealing nut 7 is threadedly connected to the lower clamp rod 8, under the action of the thread preload, the sealing nut 7 can be tightly pressed against the bottom plate of the acrylic solution pool 6 on the side closest to the bottom plate, thereby achieving a seal.

[0031] Preferably, the above structure further includes a magnetic sealing washer 9, which is sleeved on the lower clamp rod 8 and located between the sealing nut 7 and the bottom plate of the acrylic solution pool 6. Those skilled in the art will understand that, to further ensure the sealing effect, this structure preferably includes a magnetic sealing washer 9 between the sealing nut 7 and the bottom plate of the acrylic solution pool 6, ensuring that the liquid does not leak during temperature control.

[0032] Preferably, the wedge-shaped slider clamping assembly 5 in the above structure includes a base 51, a slider 54, a fixing block 52, and a double-ended screw 53. The base 51 has a wedge-shaped groove. The slider 54 is adapted to the groove and symmetrically arranged in the groove. The fixing block 52 is located at the end of the slider 54 away from the groove, and a V-shaped clamping opening is provided at the opposite end of the fixing block 52. The double-ended screw 53 is mounted in the groove and is rotatably connected to the base 51. The threads at both ends of the double-ended screw 53 have opposite directions. The slider 54 has a matching threaded hole and is sleeved on the double-ended screw 53. Those skilled in the art will understand that the preferred wedge-shaped slider clamping assembly 5 includes a base 51, a slider 54, a fixing block 52, and a double-ended screw 53. A wedge-shaped groove is actually formed on the base 51, preferably a dovetail groove structure. The slider 54 is adapted to and symmetrically arranged within the groove, and is slidably connected within it. The fixing block 52 is located at the end of the slider 54 furthest from the groove, and a V-shaped clamping opening is provided at the opposite end of the fixing block 52, allowing the sample 4 to be fixed. The double-ended screw 53 is mounted within the groove and rotatably connected to the base 51, allowing it to rotate freely. Preferably, the threads at both ends of the double-ended screw 53 have opposite directions. The slider 54 has a matching threaded hole and is fitted onto the double-ended screw 53. Tightening the double-ended screw 53 moves the two sliders 54 closer or further apart, thereby clamping the sample 4.

[0033] Preferably, in the above structure, a support base 55 is provided in the middle of the slide groove, and the double-ended screw 53 is rotatably mounted on the support base 55 in the middle. Those skilled in the art will understand that, in order to facilitate the rotatable mounting of the double-ended screw 53 within the slide groove, this structure preferably provides a support base 55 in the middle of the slide groove; in practice, the double-ended screw 53 can be rotatably mounted on the support base 55 in the middle.

[0034] Preferably, the double-ended screw 53 in the above structure is provided with a tightening part at both ends. Those skilled in the art will understand that, in order to facilitate the adjustment of the double-ended screw 53, this structure preferably provides a tightening part at both ends of the double-ended screw 53. The tightening part mainly facilitates the tightening and fixing of the fixing block 52. Therefore, in practice, a cutting surface can be provided at both ends of the double-ended screw 53 to increase friction, preferably with a hexagonal cross-section, which also facilitates the insertion of tightening sleeves or wrenches and other tools.

[0035] The usage process is as follows:

[0036] 1. According to the test requirements, fix the rod-shaped specimen 4 between the upper clamp rod 1 and the lower clamp rod 8 of the hydraulic clamp of the fatigue testing machine, and clamp it with the wedge-shaped slider clamping assembly 5;

[0037] 2. Fix the acrylic solution tank 6 to the middle of the lower clamp rod 8 using the sealing nut 7 at the bottom, install the magnetic sealing washer 9 and apply sealant to ensure a seal;

[0038] 3. Inject the corrosive liquid into the acrylic solution tank 6, install the insulation cotton layer 3 and the cover plate 2 on the outside of the acrylic solution tank 6, and set the target temperature (e.g., 35℃) through the controller 12.

[0039] 4. Start the temperature control unit 10 to monitor temperature changes and maintain the set temperature;

[0040] 5. Set the stress corrosion fatigue test parameters and start the fatigue testing machine;

[0041] 6. After the experiment, turn off the temperature control unit 10, remove the magnetic cover 2, and clean the equipment.

Claims

1. A fixture for stress corrosion fatigue test of solution controllable temperature, comprising upper fixture rod (1) and lower fixture rod (8) which are arranged in interval, characterized in that: The upper clamp rod (1) and the lower clamp rod (8) are provided with wedge-shaped sliding block clamping assemblies (5) for clamping the sample (4) at the opposite ends, the lower clamp rod (8) is sleeved with an acrylic solution pool (6) in the middle, and the lower clamp rod (8) is sealingly connected with the bottom plate side of the acrylic solution pool (6) on the outside, and the acrylic solution pool (6) is provided with a temperature control unit (10) for heating the solution inside.

2. The fixture for stress corrosion fatigue test of claim 1, wherein: It also includes a controller (12) and a display (11), and the controller (12) and the temperature control unit (10) are arranged outside the acrylic solution pool (6) and are electrically connected with the temperature control unit (10).

3. The fixture for stress corrosion fatigue test of claim 1, wherein: The outer wall of the acrylic solution pool (6) is covered with a heat preservation cotton layer (3).

4. The fixture for stress corrosion fatigue test of claim 1, wherein: The upper end of the acrylic solution pool (6) is provided with a cover plate (2), and the upper clamp rod (1) extends through the cover plate (2) into the acrylic solution pool (6).

5. The fixture for stress corrosion fatigue test with controllable temperature according to claim 4, characterized in that: The cover plate (2) is magnetically connected with the upper end of the acrylic solution pool (6).

6. The fixture for stress corrosion fatigue test of claim 1, wherein: The outer wall of the middle part of the lower clamp rod (8) is provided with external threads, the bottom plate of the lower end of the acrylic solution pool (6) is provided with a matching through hole, and the middle part of the lower clamp rod (8) is sleeved with a matching sealing nut (7), and the sealing nut (7) is located on both sides of the bottom plate of the lower end of the acrylic solution pool (6).

7. The fixture for stress corrosion fatigue test of claim 6, wherein: It also includes a magnetic sealing gasket (9) which is sleeved on the lower clamp rod (8) and located between the sealing nut (7) and the bottom plate of the acrylic solution pool (6).

8. The fixture for stress corrosion fatigue test of claim 1, wherein: The wedge-shaped sliding block clamping assembly (5) includes a base (51), a sliding block (54), a fixed block (52) and a double-headed screw rod (53), the base (51) is provided with a wedge-shaped sliding groove, the sliding block (54) is symmetrically arranged in the sliding groove and matched with the sliding groove, the fixed block (52) is arranged at the end of the sliding block (54) away from the sliding groove, and the fixed block (52) is provided with a V-shaped clamping opening at the opposite end, the double-headed screw rod (53) is arranged in the sliding groove and rotationally connected with the base (51), and the threads at both ends of the double-headed screw rod (53) are opposite in rotation direction, the sliding block (54) is provided with a matching threaded hole and sleeved on the double-headed screw rod (53).

9. The fixture for stress corrosion fatigue test of claim 8, wherein: The middle part of the sliding groove is provided with a support seat (55), and the middle part of the double-headed screw rod (53) is rotationally arranged on the support seat (55).

10. The fixture for stress corrosion fatigue test of claim 8, wherein: The both ends of the double-headed screw rod (53) are provided with a screwing part.

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