Sealing protection cover for punch test
The sealing cover, with its threaded connection and multi-layer sealing ring design, combined with high-temperature alloy materials and thermal insulation coating, solves the problem of insufficient sealing performance at high temperatures in existing technologies, achieving stability and data accuracy in high-temperature tests, and improving operational safety and convenience.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CEIC BOILER & PRESSURE VESSEL INSPECTION CO LTD
- Filing Date
- 2026-03-04
- Publication Date
- 2026-04-21
AI Technical Summary
Existing gas shields for punch tests are prone to breakage at high temperatures and have insufficient sealing performance, leading to inert gas leakage and affecting the accuracy and safety of test data.
The design employs a threaded connection structure and a multi-layer sealing ring, combined with high-temperature alloy materials and a thermal insulation coating, to ensure sealing and high-temperature resistance. Meanwhile, an observation window is provided on the protective cylinder wall to facilitate real-time observation of the test process.
It effectively prevents inert gas leakage in high-temperature environments, improves the accuracy of test data and operational safety, reduces test costs, and enhances the stability and convenience of the test.
Smart Images
Figure CN224152172U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of sealing protection covers, and more specifically, it relates to a sealing protection cover for punching rod testing. Background Technology
[0002] The punch test is a core micro-testing technique for evaluating the high-temperature mechanical properties of materials (such as high-temperature creep and high-temperature fatigue strength), and it is widely used in the local performance testing of rare metal materials or components in aerospace, nuclear power and other fields. However, in high-temperature test scenarios, the sample is prone to oxidation reaction with air, which leads to changes in the surface properties of the sample and thus causes deviations in the test data. Therefore, it is necessary to construct a closed inert gas environment (such as argon or nitrogen) through a gas protective cover.
[0003] Existing gas protective covers for punch tests generally suffer from poor high-temperature resistance, easy breakage and failure, insufficient sealing performance, and serious protective gas leakage. Traditional protective covers are mostly made of quartz glass, which is prone to cracking due to uneven thermal expansion at high temperatures, leading to frequent replacements, increased costs, and even direct breakage at excessively high temperatures. This can not only damage the sample or equipment but also cause injury to operators without their knowledge. Furthermore, the glass cover is not sealed to the base of the testing machine or is only fitted with a simple rubber ring, which is prone to aging and deformation at high temperatures, causing protective gas to leak from the gaps. This necessitates continuously increasing the gas flow rate to maintain the concentration, resulting in a significant waste of expensive inert gas.
[0004] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings, and provided a sealing protective cover for punch testing, in order to achieve a more practical purpose. Utility Model Content
[0005] To solve the above-mentioned technical problems, this utility model provides a sealing protective cover for punch testing, which is achieved by the following specific technical means:
[0006] A sealing protective cover for punch testing includes a protective cylinder, a top cover, and a bottom cover. The protective cylinder is sleeved on the outside of the punch. The outer wall of the top end of the protective cylinder is provided with an upper external thread, and the outer wall of the bottom end of the protective cylinder is provided with a lower external thread. The inner wall of the top cover is provided with an upper internal thread that matches the upper external thread. The top cover is threadedly connected to the upper external thread at the top end of the protective cylinder through the upper internal thread. The inner wall of the bottom cover is provided with a lower internal thread that matches the lower external thread. The bottom cover is threadedly connected to the lower external thread at the bottom end of the protective cylinder through the lower internal thread. The cover also includes a transparent arc plate. The cylinder wall of the protective cylinder has an observation window. The transparent arc plate is adapted to and fixedly assembled at the observation window.
[0007] Furthermore, it also includes an upper outer sealing ring, a lower outer sealing ring, and an inner sealing ring. The outer wall of the connection between the protective cylinder and the top cover has an upper groove, and the upper outer sealing ring is fitted into the upper groove. The outer wall of the connection between the protective cylinder and the bottom cover has a lower groove, and the lower outer sealing ring is fitted into the lower groove. The inner wall of the contact area between the protective cylinder and the punch has an annular groove, and the inner sealing ring is fitted into the annular groove.
[0008] Furthermore, the upper outer sealing ring, the lower outer sealing ring, and the inner sealing ring are all fluororubber parts, and the cross-sections of the upper outer sealing ring, the lower outer sealing ring, and the inner sealing ring are all circular with a cross-sectional diameter of 2mm to 4mm.
[0009] Furthermore, the protective sleeve is made of alloy.
[0010] Furthermore, the protective cylinder is a high-temperature alloy component.
[0011] Furthermore, the inner wall of the protective cylinder is coated with a heat-insulating coating.
[0012] Furthermore, the insulation coating on the inner wall of the protective cylinder is a ceramic fiber insulation coating with a thickness of 0.3mm to 0.8mm, and the surface of the insulation coating has a smooth and dense layer formed by polishing.
[0013] Furthermore, the inner diameter of the protective cylinder is 40mm to 60mm, the length is 50mm to 80mm, and the wall thickness is 1mm to 2mm.
[0014] Furthermore, the transparent arc plate is made of high borosilicate glass, and the gap between the transparent arc plate and the observation window is filled with sealant.
[0015] Furthermore, the thickness of the transparent arc plate is 5mm to 8mm, and the opening area of the observation window accounts for 15% to 25% of the total area of the protective cylinder wall.
[0016] Compared with the prior art, the present invention has the following beneficial effects:
[0017] In this invention, by setting an upper outer sealing ring, a lower outer sealing ring, and an inner sealing ring, and cooperating with the threaded connection structure of the top cover, bottom cover, and protective cylinder, the thread preload force causes each sealing ring to elastically deform and tightly fit the sealing surface, thus forming a stable closed test space. This effectively prevents the leakage of inert protective gas, avoids air entering and interfering with the test, ensures the stability of the test environment, and improves the accuracy of the test data.
[0018] In this invention, the protective cylinder is made of high-strength and high-temperature resistant alloy material, which can adapt to the high-temperature test environment and avoid structural deformation; at the same time, the heat-insulating coating on the inner wall of the protective cylinder can effectively reduce internal heat loss and maintain the stability of the high-temperature test environment, providing a reliable guarantee for the smooth conduct of the high-temperature performance test of the punch.
[0019] In this invention, by opening an observation window in the protective cylinder wall and assembling a transparent arc plate, the operator can clearly observe the status of the punch rod during the test in real time, making it convenient to record relevant test data in a timely manner. The test progress can be monitored without disassembling the protective cover, thus improving the convenience and safety of the test operation. Attached Figure Description
[0020] Figure 1 This is a three-dimensional schematic diagram of a sealing protective cover for punching rod testing according to an embodiment of this utility model.
[0021] Figure 2 This is a cross-sectional perspective view of the protective cylinder of the sealing protective cover for punching rod testing according to an embodiment of the present invention, showing the upper outer sealing ring, the lower outer sealing ring, the inner sealing ring, and the transparent arc plate.
[0022] Figure 3 This is a cross-sectional perspective view of the protective cylinder of the sealing protective cover for punching rod testing according to an embodiment of the present invention.
[0023] In the diagram, the correspondence between component names and drawing numbers is as follows:
[0024] 1. Protective sleeve; 2. Upper external thread; 3. Lower external thread; 4. Top cover; 5. Upper outer sealing ring; 6. Lower outer sealing ring; 7. Inner sealing ring; 8. Upper groove; 9. Lower groove; 10. Annular groove; 11. Observation window; 12. Transparent arc plate; 13. Bottom cover. Detailed Implementation
[0025] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.
[0026] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0028] Example:
[0029] As attached Figure 1 To be continued Figure 3 As shown:
[0030] This utility model provides a sealing protective cover for punch testing, including a protective cylinder 1, a top cover 4, and a bottom cover 13. The protective cylinder 1 is sleeved on the outside of the punch. The outer wall of the top end of the protective cylinder 1 is provided with an upper external thread 2, and the outer wall of the bottom end of the protective cylinder 1 is provided with a lower external thread 3. The inner wall of the top cover 4 is provided with an upper internal thread that matches the upper external thread 2. The top cover 4 is threadedly connected to the upper external thread 2 at the top end of the protective cylinder 1 through the upper internal thread. The inner wall of the bottom cover 13 is provided with a lower internal thread that matches the lower external thread 3. The bottom cover 13 is threadedly connected to the lower external thread 3 at the bottom end of the protective cylinder 1 through the lower internal thread. This allows for sealing of the test chamber. The system includes a quick-sealing and plugging mechanism at both ends of the body, and a threaded connection structure that provides stable pre-tightening force, laying the foundation for subsequent sealing reinforcement. It also includes a transparent arc plate 12. The wall of the protective cylinder 1 has an observation window 11. The size of the observation window 11 is optimized to ensure the field of view without affecting the structural strength of the protective cylinder 1. The transparent arc plate 12 is adapted to and fixedly assembled with the observation window 11. Its edge is sealed and fixed to the wall of the observation window 11 with sealant, which can achieve clear observation and ensure the sealing performance of the observation window 11 to prevent the leakage of protective gas.
[0031] This includes an upper outer sealing ring 5, a lower outer sealing ring 6, and an inner sealing ring 7. An upper groove 8 is provided on the outer wall of the connection between the protective cylinder 1 and the top cover 4, and the upper outer sealing ring 5 is fitted inside the upper groove 8. A lower groove 9 is provided on the outer wall of the connection between the protective cylinder 1 and the bottom cover 13, and the lower outer sealing ring 6 is fitted inside the lower groove 9. An annular groove 10 is provided on the inner wall of the contact area between the protective cylinder 1 and the punch rod, and the inner sealing ring 7 is fitted inside the annular groove 10. Through the synergistic effect of the upper outer sealing ring 5, the lower outer sealing ring 6, and the inner sealing ring 7, an all-round seal can be formed from the connection points at both ends of the protective cylinder 1 and the mating points between the protective cylinder 1 and the punch rod, reducing gas leakage.
[0032] Among them, the upper outer sealing ring 5, the lower outer sealing ring 6, and the inner sealing ring 7 are all fluororubber parts. The upper outer sealing ring 5, the lower outer sealing ring 6, and the inner sealing ring 7 are made of fluororubber material. The cross-section of the upper outer sealing ring 5, the lower outer sealing ring 6, and the inner sealing ring 7 is circular with a cross-sectional diameter of 2mm to 4mm. The fluororubber upper outer sealing ring 5, the lower outer sealing ring 6, and the inner sealing ring 7 can work stably in a temperature range of -20℃ to 250℃, and have good elasticity and sealing performance. Under the action of thread pre-tightening force, the circular cross-section of the upper outer sealing ring 5, the lower outer sealing ring 6, and the inner sealing ring 7 has a surface contact with the sealing surface, resulting in a better sealing effect. The cross-sectional diameter of 2mm to 4mm is suitable for the structural dimensions of the protective cylinder 1, and there will be no loosening or excessive compression deformation after assembly.
[0033] Among them, the protective cylinder 1 is an alloy component. The protective cylinder 1 is made of high-strength and high-temperature resistant alloy material. This alloy material is processed by special process and has excellent high-temperature resistance, deformation resistance and mechanical strength. It can work stably for a long time in the high temperature and pressure environment of the punch test and is not easy to deform or be damaged, thus providing structural support for the safe and smooth conduct of the test.
[0034] Among them, the protective cylinder 1 is a high-temperature alloy component. The high-strength and high-temperature resistant alloy material used in the protective cylinder 1 is a high-temperature alloy with a melting point of not less than 1200℃, and the outer wall of the protective cylinder 1 is subjected to anodizing anti-corrosion treatment.
[0035] The inner wall of the protective cylinder 1 is coated with a heat-insulating coating made of high-temperature resistant heat-insulating material. The coating thickness is precisely controlled, which can effectively reduce the heat exchange between the test space inside the protective cylinder 1 and the external environment, reduce the rate of heat loss, and thus stably maintain the high-temperature environment required for the test, ensuring the accuracy of the high-temperature performance test of the punch.
[0036] The inner wall of the protective cylinder 1 is coated with a ceramic fiber insulation coating with a thickness of 0.3mm to 0.8mm. The surface of the insulation coating has a smooth, dense layer formed through polishing, and the surface is treated with a polishing anti-sticking process. The thermal conductivity of the ceramic fiber insulation coating is as low as 0.03W / (m²). Below K), the thermal insulation effect is significant. The coating thickness of 0.3mm to 0.8mm will not reduce the test space inside the protective cylinder 1. The coating surface after polishing and anti-sticking treatment is smooth, and oxide scale, impurities and other substances generated during high-temperature testing are not easy to adhere. Cleaning can be completed with a cloth after the test.
[0037] The inner diameter of the protective cylinder 1 is 40mm to 60mm, the length is 50mm to 80mm, and the wall thickness is 1mm to 2mm.
[0038] The transparent arc plate 12 is made of high borosilicate glass. The gap between the transparent arc plate 12 and the observation window 11 is filled with high-temperature resistant sealant. The high borosilicate glass transparent arc plate 12 has a high temperature resistance of over 600℃ and a light transmittance of over 90%. Its thickness of 5mm to 8mm ensures that it is not easily broken at high temperatures, allowing for clear observation of the test process. The high-temperature resistant sealant can withstand the high temperature environment of the test and will not age or crack after long-term use, effectively sealing the gap between the transparent arc plate 12 and the observation window 11 and preventing the leakage of protective gas from this part.
[0039] The thickness of the transparent arc plate 12 is 5mm to 8mm, and the opening area of the observation window 11 accounts for 15% to 25% of the total wall area of the protective cylinder 1.
[0040] The working principle of this embodiment:
[0041] During the punch test, the inner sealing ring 7 is first fitted into the annular groove 10 on the inner wall of the protective cylinder 1. Then, the protective cylinder 1 is accurately fitted onto the outside of the punch to be tested, ensuring that the punch and the protective cylinder 1 are coaxially aligned. Next, the upper outer sealing ring 5 is fitted into the upper groove 8, and the lower outer sealing ring 6 is fitted into the lower groove 9. The top cover 4 and the bottom cover 13 are tightened respectively. The pre-tightening force of the threaded connection causes the upper outer sealing ring 5, the lower outer sealing ring 6, and the inner sealing ring 7 to undergo elastic deformation, tightly fitting against the corresponding sealing surfaces to form a closed test space. Then, inert protective gas is introduced into the protective cover to expel the internal air. The heat insulation coating can effectively maintain the high-temperature test environment inside the protective cover. The operator observes the test status of the punch in real time through the transparent arc plate 12 and records the relevant test data. After the test, the supply of protective gas is stopped. After the internal temperature of the protective cover drops to a safe range, the top cover 4 and the bottom cover 13 are unscrewed, the protective cylinder 1 is removed, and the test procedure is completed. Throughout the test, the protective cover maintained excellent sealing performance, effectively preventing leakage of protective gas. It also demonstrated strong high-temperature resistance and structural stability, providing a reliable guarantee for the smooth conduct of the test.
[0042] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.
Claims
1. A sealed protective cover for a punch test, characterized by: The device includes a protective cylinder (1), a top cover (4), and a bottom cover (13). The protective cylinder (1) is sleeved on the outside of the punch rod. The outer wall of the top end of the protective cylinder (1) is provided with an upper external thread (2). The outer wall of the bottom end of the protective cylinder (1) is provided with a lower external thread (3). The inner wall of the top cover (4) is provided with an upper internal thread that matches the upper external thread (2). The top cover (4) is threadedly connected to the upper external thread (2) at the top end of the protective cylinder (1) through the upper internal thread. The inner wall of the bottom cover (13) is provided with a lower internal thread that matches the lower external thread (3). The bottom cover (13) is threadedly connected to the lower external thread (3) at the bottom end of the protective cylinder (1) through the lower internal thread. The device also includes a transparent arc plate (12). The cylinder wall of the protective cylinder (1) is provided with an observation window (11). The transparent arc plate (12) is adapted to the observation window (11) and fixedly assembled at the observation window (11).
2. The sealed protective cover for a punch test as defined in claim 1, wherein: It also includes an upper outer sealing ring (5), a lower outer sealing ring (6) and an inner sealing ring (7). The outer wall of the connection between the protective cylinder (1) and the top cover (4) is provided with an upper groove (8), and the upper outer sealing ring (5) is fitted inside the upper groove (8). The outer wall of the connection between the protective cylinder (1) and the bottom cover (13) is provided with a lower groove (9), and the lower outer sealing ring (6) is fitted inside the lower groove (9). The inner wall of the contact part between the protective cylinder (1) and the punch rod is provided with an annular groove (10), and the inner sealing ring (7) is fitted inside the annular groove (10).
3. The sealed protective cover for a punch test as defined in claim 2, wherein: The upper outer sealing ring (5), the lower outer sealing ring (6) and the inner sealing ring (7) are all fluororubber parts. The cross-sections of the upper outer sealing ring (5), the lower outer sealing ring (6) and the inner sealing ring (7) are all circular with a cross-sectional diameter of 2mm to 4mm.
4. The protective seal for a punch test according to claim 1, wherein: The protective cylinder (1) is an alloy component.
5. The protective seal for a punch test as defined in claim 4, wherein: The protective cylinder (1) is a high-temperature alloy component.
6. The sealed protective cover for a punch test as defined in claim 1, wherein: The inner wall of the protective cylinder (1) is coated with a heat-insulating coating.
7. The sealed protective cover for a punch test as defined in claim 6, wherein: The inner wall of the protective cylinder (1) is coated with a ceramic fiber insulation coating, the thickness of which is 0.3mm to 0.8mm, and the surface of which has a smooth and dense layer formed by polishing.
8. The sealing protective cover for punch testing as described in claim 7, characterized in that: The inner diameter of the protective cylinder (1) is 40mm to 60mm, the length is 50mm to 80mm, and the wall thickness is 1mm to 2mm.
9. The sealed protective cover for a punch test as defined in claim 1, wherein: The transparent arc plate (12) is a high borosilicate glass component, and the gap between the transparent arc plate (12) and the observation window (11) is filled with sealant.
10. The sealed protective cover for a punch test as defined in claim 1, wherein: The thickness of the transparent arc plate (12) is 5mm to 8mm, and the opening area of the observation window (11) accounts for 15% to 25% of the total area of the protective cylinder (1) wall.