Special tool, sample clamp and detection device for low-temperature impact test in liquid helium medium
By designing specialized tooling with support frames, positioning guide rails, and automatic temperature control systems, the problem of inaccurate clamping in low-temperature impact tests in liquid helium media was solved, enabling rapid and accurate sample clamping and temperature control, thus improving the success rate and efficiency of the tests.
Patent Information
- Application Number
- CN202520418210.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-11
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-03-11
AI Technical Summary
In the cryogenic environment of liquid helium, the automatic sample delivery device malfunctions and the sample is not accurately picked up, resulting in test failure and waste of liquid helium, which fails to meet the test requirements.
A specialized tooling was designed, comprising a support frame, positioning guide rails, transverse guide rails, and a sample slot. Combined with an automatic temperature control system, the sample clamp enables rapid and accurate sample clamping, and the temperature control device precisely controls the test temperature.
It improved the success rate and data reliability of the test, reduced the difficulty of operation and the waste of liquid helium, and met the requirements of cryogenic shock test.
Smart Images
Figure CN223897258U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of low-temperature impact testing fixtures, specifically to a special fixture, sample holder, and testing device for low-temperature impact testing in liquid helium media. Background Technology
[0002] Driven by market demand, relevant companies are working intensively to develop equipment such as liquid hydrogen storage tanks. The manufacturing process of liquid hydrogen storage tanks and other equipment involves cryogenic impact testing with liquid helium media. This primarily tests the toughness of metallic materials in low-temperature environments.
[0003] Liquid helium operates at -269°C, an environment with extremely stringent requirements for materials. During cryogenic impact testing, automated sample delivery devices cannot effectively complete the test due to material issues, freezing, or malfunction. Therefore, manual methods conforming to standard requirements are used in the testing process. However, the high volatility of liquid helium leads to unclear visibility during sample handling, making accurate sample handling impossible and resulting in failure to complete the impact test within the specified time. Furthermore, manually adding liquid helium to the Dewar flask makes accurate and timely temperature control difficult, failing to meet testing requirements and wasting liquid helium, thus increasing testing costs.
[0004] In view of the above, in order to overcome the above technical problems, this utility model designs a special tooling, sample holder and temperature control device for low temperature impact testing in liquid helium medium, thus solving the above technical problems. Summary of the Invention
[0005] The technical objective of this invention is to provide a specialized tooling, sample holder, and temperature control device for low-temperature impact testing in liquid helium media with automatic temperature control. The problem to be solved is that low visibility prevents accurate and rapid sample handling. By employing an automatic temperature control system to replace manual liquid infusion, the test temperature can be controlled promptly and accurately, compensating for the shortcomings of manual operation.
[0006] To achieve the above-mentioned technical objectives, this utility model provides the following technical solution:
[0007] This utility model provides a special tooling for low-temperature impact testing in liquid helium medium, including a support frame, on which a positioning guide rail is installed. The support frame is used to connect and support the positioning guide rail and other components. A transverse guide rail is connected to the lower end of the positioning guide rail, and the transverse guide rail is connected to the sample groove.
[0008] The positioning guide rail is located above the transverse guide rail. The sample clamp typically enters the sample slot area from top to bottom to clamp the sample to be tested. The sample slot is located on one side of the positioning guide rail. As the sample clamp slides down along the side of the positioning guide rail, it clamps the sample from the outside of the positioning guide rail, thus setting the sample slot on one side of the positioning guide rail. This allows the sample clamp to quickly position itself in the sample slot, thereby quickly and accurately clamping the sample to be tested in the sample slot.
[0009] The sample well has a clamping slot for the sample clamp to pass through. Since the sample to be tested is placed inside the sample well, to facilitate clamping, and typically from the middle of the long side of the sample well, the clamping slot should be located in the middle of both sides of the sample well to ensure a stable and secure grip. This also prevents the sample clamp from failing to accurately position the sample and damaging the outer wall of the sample well.
[0010] Due to the low visibility caused by the liquid helium filling the sample well, the positioning guide rail is set from top to bottom and connected to the sample well via a transverse guide rail. In this way, the sample clamp can slide from the positioning guide rail to the transverse guide rail and then clamp the sample to be tested in the sample well. To ensure the stability and smoothness of the sample clamp's downward movement, the guide edges on both sides of the positioning guide rail are inclined inward from top to bottom. The inclined side guide rails give the sliding sample clamp a greater upward friction and a support force above the horizontal plane, thereby improving the operator's sliding feel and ensuring the stable positioning and precise fit of the sample clamp during sliding.
[0011] The lower end of the positioning guide rail is open and connected to the transverse guide rail. The transverse guide rail is horizontally set and connected to the sample slot through the clamping slot, thereby ensuring the smooth passage of the sample clamp and improving the clamping efficiency.
[0012] The test sample is located inside the sample tank. To improve the utilization rate of the liquid helium discharged from the sample tank, the bottom of the sample tank is shaped to closely match the shape of the test sample, thereby improving the contact effect between the test sample and the liquid helium and enhancing the effect of the liquid helium. Multiple equally spaced liquid helium channels are provided at the bottom of the sample tank. Through the aforementioned shape-fitting design, liquid helium is introduced into the sample tank through these channels, ensuring sufficient contact between the cryogenic liquid helium and the test sample, thus improving experimental efficiency and accuracy.
[0013] This utility model also provides a sample clamp for use in the aforementioned special tooling for cryogenic impact testing in liquid helium media. The clamp grips the sample to be tested within the sample slot. It includes a sliding clamp and an auxiliary clamp. To improve the applicability of the sample clamp and to grip samples of different shapes and sizes, the sliding clamp is designed to be planar, thereby increasing its gripping range. Its front end plane is flush with the side of the positioning guide rail, ensuring smooth sliding of the sliding clamp and thus ensuring accurate positioning. The auxiliary clamp's shape matches the gripping groove on the sample slot, preventing the auxiliary clamp from being unable to pass through the outside of the sample slot, thus avoiding the inability to grip the sample.
[0014] To improve the gripping stability of the sample clamp, the front end of the sliding clamp is provided with a protruding locking head. The protruding locking head matches the groove on the sample, thereby engaging with the groove on the sample. This not only enables quick positioning using the protruding locking head, but also improves the gripping stability of the sliding clamp.
[0015] This utility model also provides a detection device for low-temperature impact testing in liquid helium medium, including the above-mentioned special tooling for low-temperature impact testing in liquid helium medium, and a temperature control device. The temperature control device includes a sensor, a central control unit, and a liquid helium flow control component. The sensor can accurately measure the ambient temperature of the sample and feed the information back to the central control unit. The central control unit controls the liquid helium flow control component to regulate the liquid helium flow rate, thereby achieving fully automatic and precise control of the sample test temperature and realizing the effect of cost reduction and efficiency improvement.
[0016] The beneficial effects of this utility model are as follows:
[0017] 1. This utility model sets up a positioning guide rail, and the sample clamp slides down along the side of the positioning guide rail to perform a clamping action from the outside of one side of the positioning guide rail. At the same time, the sample slot is set on one side of the positioning guide rail, so that the sample clamp can quickly position itself to the position of the sample slot and quickly and accurately clamp the sample to be tested in the sample slot.
[0018] 2. This invention also ensures stable gripping by placing the clamping slots in the middle of both sides of the sample well, preventing damage to the outer wall of the sample well caused by the sample clamps failing to accurately position the sample. This effectively reduces the difficulty of operation and human error for operators in low-temperature environments, improving the success rate of the test and the reliability of the data.
[0019] 3. This utility model ensures smooth sliding of the sliding chuck by designing its sliding chuck to be planar, with its front end plane fitting against the side of the positioning guide rail, thus guaranteeing precise positioning of the sliding chuck. The front end plane of the sample clamp has a protruding locking head that matches the groove on the test sample, achieving rapid positioning and secure clamping. This avoids the auxiliary chuck being unable to pass through the outside of the sample groove, preventing clamping failure. Therefore, the sample clamp can adapt to test samples of different shapes and sizes, meeting diverse testing needs. Attached Figure Description
[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0021] The above and other aspects of the present invention will now be described by way of example only, with reference to the accompanying drawings, in which:
[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0023] Figure 2 This is a utility model Figure 1 An enlarged view of point A;
[0024] Figure 3 This is a schematic diagram of the structure of this practical sample holder;
[0025] Figure 4 This is a schematic diagram of the installation location of this practical sensor;
[0026] Figure 5 This is a schematic diagram of the sample groove of this utility model;
[0027] Figure 6 This is a schematic diagram of the central control panel and liquid helium flow control component of this utility model;
[0028] Figure 7 This is a schematic diagram showing the clamping relationship between the sample clamp and the sample to be tested in this utility model.
[0029] In the figure: 1. Support frame; 2. Positioning guide rail; 21. Guide edge; 3. Transverse guide rail; 4. Sample tank; 41. Liquid helium flow channel; 5. Gripping slot; 6. Sliding chuck; 61. Front end plane; 62. Protruding chuck; 7. Auxiliary chuck; 8. Sensor; 9. Central control panel; 10. Liquid helium flow control component. Detailed Implementation
[0030] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.
[0031] like Figure 1-4 As shown, a specialized fixture for cryogenic impact testing in liquid helium includes a support frame 1, on which a positioning guide rail 2 is mounted. The support frame 1 serves as the basic structure of the entire fixture, with the positioning guide rail 2 mounted on it. A transverse guide rail 3 is connected to the lower end of the positioning guide rail 2, and the transverse guide rail 3 is connected to the sample groove 4. The support frame 1 is made of high-strength steel to ensure sufficient rigidity and stability in cryogenic environments. The positioning guide rail 2 is fixed to the support frame 1 with bolts to ensure its stability and accuracy during use.
[0032] In this embodiment, as Figure 1 As shown, the support frame 1, which is composed of rectangular tubes, can not only effectively fix the guide rail and the sample groove 4, but also control the depth of the sample in the medium.
[0033] In this embodiment, as Figure 1 and Figure 2 As shown, the positioning guide rail 2 is located above the transverse guide rail 3, and the sample slot 4 is located on one side of the positioning guide rail 2. A clamping slot 5 is provided on the sample slot 4 for the sample clamp to pass through. The guide edges 21 on both sides of the positioning guide rail 2 are inclined inwards from top to bottom, and the lower end of the positioning guide rail 2 is open and connected to the transverse guide rail 3. The transverse guide rail 3 is horizontally positioned and connected to the sample slot 4 through the clamping slot 5. This design ensures that the sample clamp can slide smoothly along the positioning guide rail 2 and accurately clamp the test sample through the clamping slot 5. The bottom of the sample slot 4 fits the shape of the test sample, ensuring that the test sample is stably fixed during the test.
[0034] In this embodiment, as Figure 5 As shown, the bottom of the sample well 4 fits snugly against the shape of the sample to be tested. This facilitates full contact between the sample and the liquid helium medium and makes it easier to grip the sample, preventing jamming. All openings and corners within the sample well 4 are rounded.
[0035] In this embodiment, as Figure 3 As shown, a sample clamp is used for a special tooling for cryogenic impact testing in liquid helium media, as described above, to clamp the test sample in the sample slot 4. The sample clamp consists of a sliding chuck 6 and an auxiliary chuck 7. The front end plane 61 of the sliding chuck 6 is fitted with the side of the positioning guide rail 2 to ensure smooth sliding and precise positioning of the sliding chuck 6. The auxiliary chuck 7 is rectangular in shape and matches the clamping slot 5 on the sample slot 4 to prevent the auxiliary chuck 7 from being unable to pass through the outside of the sample slot 4, thus preventing failure to clamp the sample.
[0036] like Figure 3 and Figure 7 As shown, the front surface 61 of the sliding clamp 6 is provided with a protruding locking head 62, which matches the groove on the test sample to achieve rapid positioning and firm clamping. By opening a groove on the test sample that matches the protruding locking head 62, the clamping stability of the test sample is improved, thereby ensuring that the test sample clamp can adapt to test samples of different shapes and sizes and meet diverse testing needs.
[0037] In this embodiment, as Figure 4 and Figure 6 As shown, the temperature control device includes a sensor 8, a central control unit 9, and a liquid helium flow control component 10. The sensor 8 is used to measure the ambient temperature of the sample to be tested and feed the temperature information back to the central control unit 9. The central control unit 9 regulates the liquid helium flow by controlling the liquid helium flow control component. The specific structural design can be combined and replaced by those skilled in the art. The central control unit 9 is a commonly used laboratory circuit and display control system used to control and adjust the flow and opening / closing of the liquid helium flow control component 10. The liquid helium flow control component 10 consists of a gas delivery pump and an electric control switch, and can be replaced by any electric control pump gas delivery device that those skilled in the art can conceive of and that has been disclosed in the prior art.
[0038] In this embodiment, six equally spaced liquid helium channels are provided at the bottom of the sample tank 4. The liquid helium flow control component 10 is connected to the liquid helium channels 41 to introduce cryogenic liquid helium into the sample tank 4, thereby ensuring that the cryogenic liquid helium is in full contact with the sample to be tested.
[0039] like Figure 1-6 As shown, during the test, before the liquid helium medium impact test is performed on the sample in the test sample, the sample is placed in the sample tank 4, and then the fixture is placed in the Dewar flask containing liquid helium medium. The central control panel 9 sets the test temperature, opens the liquid helium bottle valve, and the liquid helium flow control component 10 controls the liquid helium to flow into the Dewar flask. When the temperature reaches the test temperature, the central control panel 9 adjusts the liquid helium flow control component 10 to control the liquid helium flow rate, so that the ambient temperature is stable and meets the test requirements.
[0040] After the heat preservation time reaches the required test time, the operator holds the sample clamp and slides it down along the side of the positioning guide rail 2. Specifically, the sliding chuck 6 of the sample clamp contacts the side of the positioning guide rail 2. Furthermore, the front end plane 61 of the sliding chuck 6 fits against the side of the positioning guide rail 2, thereby enabling the operator to hold the sample clamp and stably move it down along the positioning guide rail 2 towards the transverse guide rail 3.
[0041] Furthermore, the sliding chuck 6 slides down into the transverse guide rail 3, where it is precisely embedded. The sliding chuck 6 then grips the sample via the gripping slot 5 on the sample slot 4. The operator can perform the gripping action from the outside of the positioning guide rail 2, without visual observation, under the positioning of the transverse guide rail 3. By placing the sample slot 4 on one side of the positioning guide rail 2, the sample clamp can quickly and accurately position itself in the sample slot 4, rapidly and accurately gripping the sample to be tested within it. After gripping the sample, it is quickly moved to the impact testing machine for impact testing.
[0042] It is worth noting that the clamping slot 5 should be located in the middle of both sides of the sample slot 4 to ensure stable clamping and prevent the sample clamp from failing to accurately position the sample and damaging the outer wall of the sample slot 4. This effectively reduces the difficulty of operation and human error for operators in low-temperature environments, and improves the success rate of the test and the reliability of the data.
[0043] Although one or more exemplary embodiments of this disclosure have been described with reference to the accompanying drawings, those skilled in the art will understand that various changes in form and detail may be made therein without departing from the spirit and scope of this disclosure as defined by the appended claims.
[0044] Although the present disclosure has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to the embodiments of the present disclosure, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present disclosure are within the scope of protection claimed by the present disclosure.
[0045] The above is merely a description of the present disclosure, and modifications may be made to the present invention in light of the above detailed description. The terminology used in the appended claims should not be construed as limiting the present invention to the specific embodiments disclosed in the specification. Rather, the scope of the present invention will be fully defined by the appended claims, which will be interpreted according to established principles of claim interpretation.
Claims
1. A special tooling for cryogenic impact testing in liquid helium medium, comprising a support frame (1), characterized in that: The support frame (1) is equipped with a positioning guide rail (2), and the lower part of the positioning guide rail (2) is connected to one end of a transverse guide rail (3), and the other end of the transverse guide rail (3) is connected to the sample groove (4). The sample groove (4) is located on one side of the positioning guide rail (2); The sample groove (4) is provided with a clamping groove (5) for the sample clamp to pass through.
2. The special tooling for cryogenic impact testing in liquid helium medium according to claim 1, characterized in that: The guide edges (21) on both sides of the positioning guide rail (2) are inclined inward from top to bottom, and the lower end of the positioning guide rail (2) is open and connected to the transverse guide rail (3).
3. The special tooling for cryogenic impact testing in liquid helium medium according to claim 1 or 2, characterized in that: The transverse guide rail (3) is horizontally arranged and connected to the sample groove (4) through the clamping groove (5).
4. The special tooling for cryogenic impact testing in liquid helium medium according to claim 1, characterized in that: The clamping groove (5) is located at the middle position on both sides of the sample groove (4).
5. The special tooling for cryogenic impact testing in liquid helium medium according to claim 4, characterized in that: The internal shape of the sample groove (4) is adapted to the shape of the sample to be tested.
6. The special tooling for cryogenic impact testing in liquid helium medium according to claim 5, characterized in that: The bottom of the sample tank (4) is provided with multiple liquid helium channels (41) arranged at equal intervals, and the liquid helium channels (41) are used to introduce liquid helium.
7. A sample clamp, used for clamping the sample to be tested in the sample slot (4) as described in claim 1, for a special tooling for cryogenic impact testing in liquid helium medium, characterized in that: It includes a sliding chuck (6) and an auxiliary chuck (7). The sliding chuck (6) is planar, and its front end plane (61) is in contact with the side of the positioning guide rail (2). The shape of the auxiliary chuck (7) matches the clamping groove (5) on the sample groove (4).
8. The sample holder according to claim 7, characterized in that: The sliding chuck (6) has a raised chuck (62) on its front end plane (61), which matches the groove on the sample to be tested.
9. A testing device for cryogenic impact testing in liquid helium medium, characterized in that: The special tooling as described in claim 1 also includes a temperature control device, which includes a sensor (8), a central control unit (9) and a liquid helium flow control component (10). The sensor (8) is used to measure the ambient temperature of the sample to be tested and to feed the temperature information back to the central control unit (9). The central control unit (9) controls the liquid helium flow by controlling the liquid helium flow control component (10).