Sample connecting device for high-temperature creep test
By designing a connection device that includes upper and lower connectors and a half-flange sleeve, the problems of non-disassembly of threaded connections and uneven loading in high-temperature creep tests were solved, achieving uniform loading of the specimen and accuracy of test data.
Patent Information
- Application Number
- CN202423135121.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2034-12-18
AI Technical Summary
In existing high-temperature creep tests, threaded connections prevent specimens from being disassembled, while open U-shaped hole mounting methods result in uneven loading, affecting the lifespan of the connectors and the accuracy of test data.
A connecting device including upper and lower connectors and a half-flange sleeve is adopted. Through the design of the round hole and the half-flange sleeve, uniform loading of the sample is achieved, ensuring the fixation of the sample at both ends and the accuracy of the data.
Uniform loading of the sample was achieved, ensuring the accuracy of test data in the high-temperature creep test and extending the service life of the connector.
Smart Images
Figure CN223727523U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of mechanical testing equipment under high temperature environment, specifically, it relates to a high temperature creep test specimen connection device. Background Technology
[0002] Metallic materials exhibit creep under certain temperature and stress conditions. In steam turbines, boilers, chemical equipment, and aero engines, many components frequently experience plastic deformation and fracture failure after operating under high temperature and high pressure conditions for a period of time. Therefore, creep performance is one of the important indicators for metal material selection and high-temperature mechanical design.
[0003] In high-temperature creep tests, there are typically two methods for clamping specimens: one is a rod-shaped specimen with threads at both ends, where the specimen is connected to the connector via threads; the other is a rod-shaped specimen with stepped ends, where the specimen is inserted into the connector and hung on it through an open U-shaped hole. The threaded connection method is prone to thread adhesion under prolonged high temperatures, making the specimen impossible to remove. While the open U-shaped hole method avoids thread adhesion, the specimen support surface is not a complete annular surface, leading to uneven loading, which affects the connector's lifespan and the accuracy of the test data. Utility Model Content
[0004] The purpose of this invention is to address the aforementioned problems in current high-temperature creep testing by providing a high-temperature creep test specimen connection device that can uniformly load the specimen, thereby ensuring the accuracy of test data points.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A high-temperature creep test specimen connection device is used for loading a specimen. The specimen has ends at both ends and steps at the ends. The specimen connection device includes upper and lower connectors, and two pairs of half-flange sleeves that respectively engage and fix the specimen at the steps at both ends.
[0007] The connector includes a cylindrical connector body with an externally threaded head at its upper end for loading and fixing with the testing device; a horizontal square through hole is opened in the middle of the connector body, the width of which is slightly larger than the outer diameter of the two half-flange sleeves that are clamped together; a vertical circular hole is opened at the bottom of the connector body and connects to the square through hole; the inner diameter of the circular hole is larger than the outer diameter of the end of the specimen and smaller than the outer diameter of the two half-flange sleeves that are clamped together, thereby allowing the end of the specimen to pass through the circular hole into the square through hole and be clamped and fixed by the two half-flange sleeves on both sides, while the two half-flange sleeves cannot pass through the circular hole after clamping and fixing the specimen.
[0008] Further, the half-flange sleeve is a half-ring body, comprising a limiting part with a larger radius and a card-inserting part with a smaller radius, thereby forming a limiting step.
[0009] Preferably, the outer diameter of the card-inserting part is smaller than the inner diameter of the round hole, so that after the two half-flange sleeves are fixed on the sample, the card-inserting parts can be inserted into the round hole, thereby better fixing the sample during the test.
[0010] More preferably, the outer diameter of the card-inserting part is matched with the inner diameter of the round hole, thereby preventing the card-inserting part from moving left and right in the round hole.
[0011] The utility model has the following beneficial effects:
[0012] 1. In order to ensure the uniformity of the connection head to the two ends of the stepped rod-shaped sample, the connection head cannot be installed with an open U-shaped hole for testing, and a round hole must be used, and the diameter of the two ends of the stepped rod-shaped sample is the largest, therefore, after the stepped rod-shaped sample is installed in the connection head, the upper and lower ends of the stepped rod-shaped sample are respectively loaded through the installation of two half-flange sleeves.
[0013] 2. The high-temperature creep test sample connecting device of the utility model realizes the uniformity of the sample loading by using two half-flange sleeves to realize the load transmission, thereby ensuring the accuracy of the test data points. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 It is a schematic view of the structure in the front view direction of the high-temperature creep test sample connecting device of the utility model.
[0015] Figure 2 It is a schematic view of the structure in the front view direction of the high-temperature creep test sample connecting device of the utility model. Figure 1 It is a structural cross-sectional view along A-A.
[0016] Figure 3 It is a schematic view of the half-flange sleeve.
[0017] FIG. 1 is a schematic view of the structure in the front view direction of the high-temperature creep test sample connecting device of the utility model.
[0018] 1- sample; 11- end; 12- step;
[0019] 2- connection head; 21- connection head body; 22- head; 23- square hole; 24- round hole;
[0020] 3- half-flange sleeve; 31- limiting part; 32- card-inserting part. DETAILED DESCRIPTION
[0021] The utility model will be further described in detail in combination with the drawings and specific embodiments. It should be understood that the following embodiments are only used to illustrate the utility model and are not used to limit the scope of the utility model.
[0022] As Figure 1and Figure 2 As shown in the drawings, the high-temperature creep test sample connecting device of the utility model is used for loading sample 1, the sample 1 has end 11 at both ends, and has ladder 12 at the end; the sample connecting device includes two connecting heads 2 up and down, and two pairs of half flange sleeves 3 that embrace and fix the sample 1 at ladder 12 at both ends of the sample 1, wherein:
[0023] The connecting head 2 includes a cylindrical connecting head body 21, the upper end of which has a threaded head 22 for loading and fixing with the test device (not shown in the drawings); the middle part of the connecting head body 21 is provided with a horizontal square through hole 23, the width of which is slightly larger than the outer diameter of the embraced two half flange sleeves 3; the bottom of the connecting head body 21 is provided with a vertical circular hole 24 that is communicated to the square through hole 23; the inner diameter of the circular hole 24 is greater than the outer diameter of the end 11 of the sample 1 and smaller than the outer diameter of the embraced two half flange sleeves 3, so that the end 11 of the sample 1 can pass through the circular hole 24 into the square through hole 23 and be fixed by the two half flange sleeves 3 on both sides, and the two half flange sleeves 3 cannot pass through the circular hole 24 after embracing and fixing the sample 1.
[0024] Further, as shown in the drawings, Figure 3 The half flange sleeve 3 is a half annular body, including a limiting part 31 with a larger radius and a card inserting part 32 with a smaller radius, so as to form a limiting ladder; the outer diameter of the card inserting part 32 is smaller than the inner diameter of the circular hole 24, so that the card inserting part 32 of the two half flange sleeves 3 can be inserted into the circular hole 24 after embracing and fixing the sample 1, so that the sample 1 can be better fixed in the test; preferably, the outer diameter of the card inserting part 32 is matched with the inner diameter of the circular hole 24, that is, the card inserting part 32 can be inserted into the circular hole 24, so as to prevent the card inserting part 32 from moving left and right in the circular hole 24.
[0025] The use method of the high-temperature creep test sample connecting device of the utility model is as follows:
[0026] First, the upper and lower ends 11 of the sample 1 are respectively passed through the circular holes 24 of the upper and lower connecting heads 2 into the corresponding square through holes 23, then the two half flange sleeves 3 are tightly fixed to the ladder 12 of the sample 1 to embrace and fix the sample 1, then the card inserting parts 32 of the two half flange sleeves 3 are inserted into the corresponding circular holes 24, so as to complete the embracing and fixing of the sample 1; finally, the head 22 of the upper and lower connecting heads 2 is screwed with the test device, so as to complete the loading of the sample 1, and then the high-temperature creep test of the sample 1 can be carried out.
Claims
1. A high temperature creep test sample connecting device for loading a sample (1) having end heads (11) at both ends and steps (12) at the end heads, characterized in that: the sample connecting device comprises two connecting heads (2) and two pairs of half flange sleeves (3) for embracing and fixing the sample (1) at the steps (12) at both ends of the sample (1), wherein: the connecting head (2) comprises a cylindrical connecting head body (21) having an externally threaded head (22) at the upper end for loading and fixing with a test device; a horizontally oriented square through hole (23) is formed in the middle of the connecting head body (21), the width of the square through hole (23) being greater than the outer diameter of the two embracing half flange sleeves (3); a vertically oriented circular hole (24) is formed in the bottom of the connecting head body (21) and is connected to the square through hole (23); the inner diameter of the circular hole (24) is greater than the outer diameter of the end head (11) of the sample (1) and is less than the outer diameter of the two embracing half flange sleeves (3). The half flange sleeve (3) is a half annular body comprising a limiting portion (31) with a larger radius and an insertion portion (32) with a smaller radius, thereby forming a limiting step. The outer diameter of the insertion portion (32) is less than the inner diameter of the circular hole (24).
2. The high temperature creep test specimen attachment device of claim 1, wherein, The outer diameter of the insertion portion (32) is adapted to the inner diameter of the circular hole (24).
3. The high temperature creep test specimen attachment apparatus of claim 2, wherein, 4. The high temperature creep test specimen attachment apparatus of claim 3, wherein,