Sample clamp

Abstract

A sample clamp is used for improving the high temperature resistance of the sample clamp. The sample clamp comprises a loaded part and a clamping part; the loaded part is provided with a first end and a second end in the length direction, and the first end is used for being connected with a tester to be loaded; the clamping piece is provided with a third end and a fourth end in the length direction, and the fourth end is used for being connected with a sample; wherein the second end is connected with the third end; the second end is provided with a first cooling flow channel, the third end is provided with a second cooling flow channel, and the first cooling flow channel communicates with the second cooling flow channel so that a cooling medium can flow.

Description

TECHNICAL FIELD

[0001] The utility model relates to test fixture, concretely relates to a sample fixture for high temperature tensile and high temperature creep test. BACKGROUND

[0002] With the continuous pursuit of high performance of the turbine of the aero-engine, the service temperature of the hot end component of the aero-engine is also continuously improved, the hot end component not only bears the continuous high stress, but also bears the huge temperature load, the strength performance of the hot end component, such as tensile, fatigue and creep performance, is crucial to the durability of the engine parts, and directly affects the safety and economy of the engine. In order to ensure the strength design reliability of the hot end component, a fatigue machine or a tensile machine is usually used for related strength test. However, the working temperature of the hot end component of the aero-engine is extremely high, in order to ensure the effectiveness of the test, the fatigue and creep test is usually carried out at a high temperature of about 1000 DEG C. In the test process, the extremely high temperature of the sample is easily conducted to the sample fixture, and the sample fixture is conducted to the clamping end of the test machine, causing the damage of the tester and the sensor. In addition, under the action of high temperature and high load for a long time, the sample fixture and the sample are easy to be oxidized and bonded, causing the sample fixture to be scrapped. SUMMARY

[0003] The utility model discloses a sample fixture for improving the high temperature resistance of the sample fixture.

[0004] According to the embodiment of the utility model, the sample fixture includes a load-bearing part and a clamping part, the load-bearing part is provided with a first end and a second end in the length direction, the first end is used for connecting the loaded test machine, the clamping part is provided with a third end and a fourth end in the length direction, the fourth end is used for connecting the sample, wherein the second end is connected with the third end, the second end is provided with a first cooling flow channel, the third end is provided with a second cooling flow channel, and the first cooling flow channel is communicated with the second cooling flow channel for the flow of cooling medium.

[0005] In one or more embodiments, the first end is provided with a first threaded head, and the first threaded head is used for connecting the test machine.

[0006] In one or more embodiments, the fourth end is provided with a first threaded hole, and the first threaded hole is used for connecting the sample.

[0007] In one or more embodiments, the second end is provided with a second threaded head, the third end is provided with a second threaded hole, the second threaded head is threadedly connected with the second threaded hole to connect the second end and the third end, the second cooling flow channel is communicated with the second threaded hole, and the first cooling flow channel is provided with an opening at the second threaded head for the first cooling flow channel to be communicated with the second threaded hole.

[0008] In one or more embodiments, the second threaded hole extends along the length direction; the fourth end is provided with a first threaded hole for connecting a test sample, the first threaded hole extending along the length direction; a central axis of the second threaded hole coincides with a central axis of the first threaded hole, and a distance between a bottom of the second threaded hole and a bottom of the first threaded hole in the length direction is greater than a length of the second threaded hole.

[0009] In one or more embodiments, a sealing gasket is arranged between an end face of the second end and an end face of the third end.

[0010] In one or more embodiments, the second threaded head protrudes from the second end along the length direction, the first cooling flow channel includes a first hole and a second hole, the second hole extends from the second threaded head along the length direction to the second end from the opening, the first hole communicates with the second hole and extends to a side wall face of the second end, and the first hole and the second hole are perpendicular to each other; the second threaded hole extends from the end face of the third end along the length direction, the second cooling flow channel includes a third hole and a fourth hole, the fourth hole extends from the end face of the third end along the length direction, the third hole communicates with the fourth hole and extends to the second threaded hole, and the third hole and the fourth hole are perpendicular to each other.

[0011] In one or more embodiments, the first hole is provided with an internal thread for connecting a cooling medium pipeline, and the fourth hole is provided with an internal thread for connecting a cooling medium pipeline.

[0012] In one or more embodiments, the first cooling flow channel and the second cooling flow channel have the same inner diameter, and an inner diameter of the first threaded hole is twice the inner diameter of the first cooling flow channel and the second cooling flow channel.

[0013] In one or more embodiments, the clamping member has a prismatic profile.

[0014] The embodiments of the utility model have at least one of the following beneficial effects:

[0015] The connection part of the load-receiving member and the clamping member is cooled by the cooling medium, heat transfer from the clamping member to the load-receiving member is reduced, the load-receiving member and the testing machine are prevented from being damaged due to high temperature, and the clamping member and the load-receiving member are prevented from being adhered due to high temperature. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above and other features, properties, and advantages of the utility model will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0017] Figure 1 Schematic view of a test using a test fixture;

[0018] Figure 2 Schematic view of a test using a test fixture; Figure 1 Oblique view of a high-medium temperature furnace opened;

[0019] Figure 3 Schematic view of a test using a test fixture; Figure 1 Sectional view of the A-A section;

[0020] Figure 4 Schematic view of a test using a test fixture; Figure 3 Detail of the sectional view of the A-A section;

[0021] Figure 5 Schematic view of a test using a test fixture;

[0022] Figure 6 Schematic view of a test using a test fixture; Figure 5 Sectional view of the B-B section;

[0023] Figure 7 Schematic view of a test using a test fixture;

[0024] Figure 8 Schematic view of a test using a test fixture; Figure 7 Sectional view of the B-B section;

[0025] Figure 9 Schematic view of a test using a test fixture;

[0026] Figure 10 Schematic view of a test using a test fixture.

[0027] Reference signs:

[0028] 1 - test specimen;

[0029] 2 - load receiver;

[0030] 3 - first end;

[0031] 4 - second end;

[0032] 5 - clamping element;

[0033] 6 - third end;

[0034] 7 - fourth end;

[0035] 8 - first threaded hole;

[0036] 9 - first cooling channel;

[0037] 10 - second cooling channel;

[0038] 11 - high temperature furnace;

[0039] 12 - second threaded head;

[0040] 13 - second threaded hole;

[0041] 14 - opening;

[0042] 15 - first hole;

[0043] 16 - second hole;

[0044] 17 - third hole;

[0045] 18 - fourth hole;

[0046] 19 - plug screw;

[0047] 20 - sealing washer;

[0048] 21 - cooling medium line;

[0049] 22 - circulating cooling system. DETAILED DESCRIPTION

[0050] The utility model will be further described below in combination with specific embodiments and drawings, and more details are set forth in the following description to facilitate full understanding of the utility model, but the utility model can obviously be implemented in various other ways different from the description, and those skilled in the art can make similar generalization and deduction according to actual application conditions without departing from the connotation of the utility model, therefore the protection scope of the utility model should not be limited by the content of the specific embodiments.

[0051] It should be noted that these and other subsequent drawings are merely examples, not drawn in proportion, and should not be used as a limitation on the actual protection scope required by the utility model.

[0052] The terms "first", "second", etc. can be used interchangeably to distinguish one feature from another, and are not intended to indicate that the respective features must be located in the positions as shown in the drawings in various embodiments.

[0053] Figure 1 A scenario of high-temperature tensile test using the specimen clamp of the utility model embodiment is shown. As shown in Figure 2 and Figure 3 Two specimen clamps are used to clamp the specimen 1. As shown in Figures 1 to 4 The specimen clamp includes a load-bearing member 2, which is provided with a first end 3 and a second end 4 in the length direction. The first end 3 is used to connect the test machine to be loaded, and the first end 3 can be provided with a first threaded head to be threadedly connected with the test machine, which can be formed by machining external threads on the first end 3 of the cylindrical load-bearing member 2, which is simple in structure and suitable for existing test machines, as shown in Figure 5 . As shown inFigures 1 to 4 As shown in the figure, the sample clamp further comprises a clamping member 5, which is provided with a third end 6 and a fourth end 7 in the length direction, and the fourth end 7 is used to connect the sample 1, and further refer to Figure 8 , the fourth end 7 can be provided with a first threaded hole 8 to be screwed with the sample 1, and the structure is simple. As shown in the figure, Figures 1 to 4 The second end 4 is connected with the third end 6, so that the load-bearing member 2 is connected with the clamping member 5, and the testing machine applies load to the sample 1 through the load-bearing member 2 and the clamping member 5. As shown in the figure, Figure 6 The second end 4 is provided with a first cooling flow channel 9, as shown in the figure, Figure 8 The third end 6 is provided with a second cooling flow channel 10, as shown in the figure, Figure 4 The first cooling flow channel 9 is communicated with the second cooling flow channel 10, and the cooling medium flows in the first cooling flow channel 9 and the second cooling flow channel 10 to cool the second end 4 and the third end 6. The second cooling flow channel 10 of the clamping member 5 is located at the third end 6, which reduces the cooling of the fourth end 7 and thus reduces the influence of the high-temperature environment on the sample 1.

[0054] As shown in the figure, Figures 1 to 3 When the high-temperature tensile test is carried out, the high-temperature furnace 11 is used to make the sample 1 in a high-temperature environment, and the fourth end 7 of the clamping member 5 is also in a high-temperature environment. The connection between the load-bearing member 2 and the clamping member 5 is cooled by the cooling medium, which reduces the heat transfer from the clamping member 5 to the load-bearing member 2, avoids the damage of the load-bearing member 2 and the testing machine due to high temperature, and avoids the adhesion of the clamping member 5 and the load-bearing member 2 due to high temperature. After the test is completed, if the clamping member 5 and the sample 1 are adhered due to high temperature, the clamping member 5 and the load-bearing member 2 are separated, which facilitates the disassembly of the sample 1 together with the clamping member 5. The clamping member 5 can be made of high-temperature steel material, and the cost of replacing a new clamping member 5 is low. Replacing clamping members 5 of different structures and sizes facilitates the adaptation to different samples 1.

[0055] As shown in the figure, Figure 4 The second end 4 can be provided with a second threaded head 12, and the third end 6 can be provided with a second threaded hole 13. The second threaded head 12 is screwed with the second threaded hole 13 to connect the second end 4 and the third end 6, and the structure is simple. The second cooling flow channel 10 is communicated with the second threaded hole 13, and the first cooling flow channel 9 is provided with an opening 14 at the second threaded head 12 for the first cooling flow channel 9 to be communicated with the second threaded hole 13, so that the first cooling flow channel 9 is communicated with the second cooling flow channel 10 through the second threaded hole 13. The opening 14 can be provided on the end face of the second threaded head 12 to communicate with the second threaded hole 13.

[0056] As shown in the figure, Figure 8 The second threaded hole 13 can extend in the length direction, and the first threaded hole 8 can also extend in the length direction, and the central axis of the second threaded hole 13 coincides with the central axis of the first threaded hole 8. After the sample 1 and the load-bearing member 2 are screwed, the coaxial stability is good, which ensures that the loading direction coincides with the axis of the sample 1. As shown in the figure, Figure 8As shown, the distance between the bottom of the second threaded hole 13 and the bottom of the first threaded hole 8 in the length direction is greater than the length of the second threaded hole 13, which can be expressed as H3-H1-H2>H1, which makes the first threaded hole 8 away from the second threaded hole 13, reducing the influence of the cooling on the high-temperature environment of the sample 1. Figure 8

[0057] As shown, the second threaded head 12 can protrude from the end face of the second end 4 in the length direction, the first cooling flow channel 9 can include a first hole 15 and a second hole 16, the second hole 16 can extend from the second threaded head 12 to the second end 4 in the length direction from the opening 14, the first hole 15 communicates with the second hole 16 and extends to the side wall surface of the second end 4, the first hole 15 and the second hole 16 are perpendicular to each other, which is simple in structure and convenient for punching processing. Figure 6 As shown, the second threaded hole 13 can extend from the end face of the third end 6 in the length direction, the second cooling flow channel 10 can include a third hole 17 and a fourth hole 18, the fourth hole 18 can extend from the end face of the third end 6 in the length direction, the third hole 17 communicates with the fourth hole 18 and extends to the second threaded hole 13, the third hole 17 and the fourth hole 18 are perpendicular to each other, which is simple in structure and convenient for punching processing. Further, the third hole 17 also extends to the side wall surface of the third end 6, which is convenient for punching processing of the third hole 17 from the side wall surface of the third end 6, and the third hole 17 can be provided with a plug screw 19 as shown, the plug screw 19 is screwed to the opening of the third hole 17 in the side wall surface of the third end 6, which avoids leakage of the cooling medium. Figure 8 Figure 4 As shown, the second threaded hole 13 can extend from the end face of the third end 6 in the length direction, the second cooling flow channel 10 can include a third hole 17 and a fourth hole 18, the fourth hole 18 can extend from the end face of the third end 6 in the length direction, the third hole 17 communicates with the fourth hole 18 and extends to the second threaded hole 13, the third hole 17 and the fourth hole 18 are perpendicular to each other, which is simple in structure and convenient for punching processing. Further, the third hole 17 also extends to the side wall surface of the third end 6, which is convenient for punching processing of the third hole 17 from the side wall surface of the third end 6, and the third hole 17 can be provided with a plug screw 19 as shown, the plug screw 19 is screwed to the opening of the third hole 17 in the side wall surface of the third end 6, which avoids leakage of the cooling medium.

[0058] As shown, the second end 4 and the third end 6 can be provided with a sealing washer 20 between the end faces, which improves the sealing performance and avoids leakage of the cooling medium, the sealing washer 20 can be made of high-temperature metal material and coated with high-temperature resistant anti-seizure agent. Figure 4 As shown, the first hole 15 can be provided with internal threads to threadedly connect a cooling medium pipeline 21, the fourth hole 18 can be provided with internal threads to threadedly connect the cooling medium pipeline 21, and the cooling medium pipeline 21 is used for cooling medium flow. Further referring to

[0059] , a circulating cooling system 22 can be configured to circulate the cooling medium, as shown by the curved arrow in Figure 4 , the cooling medium can flow in the order of the first hole 15, the second hole 16, the second threaded hole 13, the third hole 17, and the fourth hole 18, and the cooling medium can also flow in the order of the fourth hole 18, the third hole 17, the second threaded hole 13, the second hole 16, and the first hole 15. Figure 3 Figure 3 As shown, the first hole 15 can be provided with internal threads to threadedly connect a cooling medium pipeline 21, the fourth hole 18 can be provided with internal threads to threadedly connect the cooling medium pipeline 21, and the cooling medium pipeline 21 is used for cooling medium flow. Further referring to

[0060] As shown, the first hole 15 can be provided with internal threads to threadedly connect a cooling medium pipeline 21, the fourth hole 18 can be provided with internal threads to threadedly connect the cooling medium pipeline 21, and the cooling medium pipeline 21 is used for cooling medium flow. Further referring to Figure 4 ​​​As shown, the first cooling channel 9 and the second cooling channel 10 can have the same inner diameter, thereby stabilizing the flow rate of the cooling medium within the first cooling channel 9 and the second cooling channel 10. Figure 4 In the illustrated embodiment, the first channel 15, the second channel 16, the third channel 17, and the fourth channel 18 may have the same inner diameter, so that the first cooling channel 9 and the second cooling channel 10 have the same inner diameter. The inner diameter of the first cooling channel 9 and the second cooling channel 10 may be set to half the inner diameter of the first threaded hole 8. This avoids insufficient cooling capacity, thus ensuring the cooling effect at the connection between the load-bearing member 2 and the clamping member 5, and also avoids excessive cooling capacity, which could affect the high-temperature environment of the sample 1. Furthermore, the inner diameter of the first cooling channel 9 and the second cooling channel 10 is greater than or equal to six millimeters to avoid insufficient cooling capacity, thus ensuring the cooling effect at the connection between the load-bearing member 2 and the clamping member 5. Preferably, the inner diameter of the first cooling channel 9 and the second cooling channel 10 is six millimeters.

[0061] like Figure 7 As shown, the clamping member 5 may have a prismatic profile, which facilitates applying force to the clamping member 5 to rotate the clamping member 5 for threaded connection. The prismatic profile of the clamping member 5 may be a regular octagon, a regular hexagon, a regular dodecagon, etc.

[0062] Figure 9 A cross-section of the loaded member 2 of another embodiment is shown below, which will only be discussed in detail below. Figure 9 The illustrated embodiments and Figure 6 The differences between the illustrated embodiments will be described. Figure 9 In the embodiment shown, the first cooling channel 9 is provided with two first channels 15, the central axes of the two first channels 15 coincide, and both first channels 15 are connected to the second channel 16.

[0063] Figure 10 A cross-section of the clamping member 5 of another embodiment is shown below, which will only be discussed in detail below. Figure 10 The illustrated embodiments and Figure 8 The differences between the illustrated embodiments will be described. Figure 8 In the illustrated embodiment, the clamping member 5 is provided with a second cooling channel 10. Figure 10 In the embodiment shown, the clamping member 5 is provided with two second cooling channels 10, which are located in the same plane and are symmetrical about the central axis of the second threaded hole 13.

[0064] Although the present invention has been disclosed above with reference to embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention.

Claims

1. A sample holder for high-temperature testing, characterized in that... include: The load-bearing component has a first end and a second end in the length direction, the first end being used to connect the testing machine to be loaded; as well as A clamping member having a third end and a fourth end along the length direction, the fourth end being used to connect the sample; in, The second end is connected to the third end; The second end is provided with a first cooling channel, and the third end is provided with a second cooling channel. The first cooling channel is connected to the second cooling channel for the flow of cooling medium.

2. The sample fixture according to claim 1, characterized in that: The first end is provided with a first threaded head, which is used to connect to the testing machine.

3. The sample fixture according to claim 1, characterized in that: The fourth end is provided with a first threaded hole, which is used to connect the sample.

4. The sample holder according to claim 1, characterized in that: The second end is provided with a second threaded head, and the third end is provided with a second threaded hole. The second threaded head is threadedly connected to the second threaded hole to connect the second end and the third end. The second cooling channel is connected to the second threaded hole, and the first cooling channel has an opening at the head of the second thread for the first cooling channel to connect to the second threaded hole.

5. The sample fixture according to claim 4, characterized in that: The second threaded hole extends along the length direction; The fourth end is provided with a first threaded hole, which is used to connect the sample, and the first threaded hole extends along the length direction. The central axis of the second threaded hole coincides with the central axis of the first threaded hole, and the distance between the bottom of the second threaded hole and the bottom of the first threaded hole in the length direction is greater than the length of the second threaded hole.

6. The sample holder according to claim 4, characterized in that: A sealing gasket is provided between the end face of the second end and the end face of the third end.

7. The sample fixture according to claim 4, characterized in that: The second thread head protrudes from the second end along the length direction. The first cooling channel includes a first channel and a second channel. The second channel extends from the opening from the second thread head along the length direction to the second end. The first channel communicates with the second channel and extends to the side wall of the second end. The first channel and the second channel are perpendicular to each other. The second threaded hole extends from the end face of the third end along the length direction. The second cooling channel includes a third channel and a fourth channel. The fourth channel extends from the end face of the third end along the length direction. The third channel connects to the fourth channel and extends to the second threaded hole. The third channel and the fourth channel are perpendicular to each other.

8. The sample fixture according to claim 7, characterized in that: The first channel is provided with an internal thread for connecting to a cooling medium pipeline, and the fourth channel is provided with an internal thread for connecting to a cooling medium pipeline.

9. The sample fixture according to claim 3, characterized in that: The first cooling channel and the second cooling channel have the same inner diameter, and the inner diameter of the first threaded hole is twice the inner diameter of the first cooling channel and the second cooling channel.

10. The sample fixture according to claim 1, characterized in that: The clamping element has a prismatic profile.

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