Graphite raw material hardness testing device with heat preservation performance and use method

Abstract

The application relates to a graphite raw material hardness test device with heat preservation performance and a use method, and belongs to the technical field of graphite test. An opening end of an upper end of a heat preservation box body is sealed and blocked by a heat preservation upper cover, a side wall of the heat preservation box body is provided with a through hole two, the through hole two is slidably connected with a horizontally arranged push rod during test, and the through hole two is interference-inserted with a taper plug two during non-test; a middle part of the heat preservation upper cover is provided with a through hole one, the through hole one is internally connected with a working part of a tester during test, and the through hole one is interference-inserted with a taper plug one during non-test. A plurality of stop pins vertically arranged with the push rod are inserted into the heat preservation box body. The plurality of stop pins are arranged in parallel and at equal distances. The application ensures the temperature stability of a test piece during transfer and test, improves test efficiency, reduces detection cost, can collect hardness values of multiple points under low-temperature environment at a time, and the test efficiency is higher than that of single-point hardness value measurement.

Description

TECHNICAL FIELD

[0001] The application relates to a graphite raw material hardness test device with heat preservation performance and a use method, and belongs to the technical field of graphite tests. BACKGROUND

[0002] In the fields of aerospace, cryogenic engineering and superconducting technology, the mechanical property stability of materials in an extremely low-temperature environment is directly related to the reliability and safety of equipment. Graphite raw materials have become candidate materials for key components in the above fields due to their excellent thermal stability, low thermal expansion coefficient and good mechanical properties. In order to accurately evaluate the applicability of the graphite materials in a deep cooling environment, low-temperature hardness testing of the graphite materials needs to be carried out to characterize the low-temperature mechanical property parameters.

[0003] In the prior art, when the low-temperature hardness of the graphite raw material is tested, the graphite raw material is directly exposed to room temperature for testing after being taken out of the extremely low-temperature environment box. Since there is no effective heat preservation device, the immediate heating of the graphite raw material leads to a large deviation of the test because the required temperature cannot be maintained. SUMMARY

[0004] To solve the problems in the background art, the application provides a graphite raw material hardness test device with heat preservation performance and a use method.

[0005] To achieve the above-mentioned purpose, the application adopts the following technical scheme: a graphite raw material hardness test device with heat preservation performance, comprising a heat preservation box body, a cone plug one, a heat preservation upper cover, a cone plug two and a push rod; the open end of the upper end of the heat preservation box body is sealed and plugged by the heat preservation upper cover, the side wall of the heat preservation box body is provided with a through hole two, the push rod arranged horizontally is slidably inserted into the through hole two during testing, and the cone plug two is interference-inserted during non-testing; the middle part of the heat preservation upper cover is provided with a through hole one, the working part of the tester is inserted into the through hole one during testing, and the cone plug one is interference-inserted during non-testing.

[0006] Further, the heat preservation box body and the heat preservation upper cover are detachably fixedly connected through a plurality of screws.

[0007] Further, a sealing ring is arranged between the heat preservation box body and the heat preservation upper cover.

[0008] Further, a wear-resistant bushing is arranged at the contact position of the push rod and the through hole two.

[0009] Further, a guide groove is arranged on the inner bottom surface of the heat preservation box body, and the pushing direction of the push rod is consistent with the guide groove.

[0010] Further, the outer end of the push rod is provided with a scale mark or a scale.

[0011] Further, a plurality of blocking pins vertically arranged with the push rod are inserted into the heat preservation box.

[0012] Further, the plurality of blocking pins are arranged in parallel and equidistant.

[0013] The use method of the graphite raw material hardness test device with heat preservation performance comprises the following steps:

[0014] S1: the through hole one is blocked by the taper plug one, and the through hole two is blocked by the taper plug two;

[0015] S2: the graphite raw material is placed in the guide groove on the bottom surface of the heat preservation box after being taken out from the low-temperature environment box, the heat preservation box is blocked by the heat preservation upper cover to maintain the temperature and is transferred to the side of the tester;

[0016] S3: the taper plug two is removed, the push rod is inserted into the through hole two, and the taper plug one is removed so that the through hole one corresponds to the interface of the tester;

[0017] S4: the push rod drives the graphite raw material to contact the first blocking pin, and the working part of the tester is inserted through the through hole one to obtain the first point hardness value;

[0018] S5: the first blocking pin is pulled out, the push rod is continuously pushed to drive the graphite raw material to contact the second blocking pin, and the working part of the tester is inserted through the through hole one to obtain the second point hardness value;

[0019] S6: S5 is repeated to obtain the hardness values of all point positions in turn;

[0020] S7: the two hardness values with the maximum and minimum values are removed, and the average value of the remaining hardness values is the hardness value of the graphite raw material.

[0021] Compared with the prior art, the present application has the following advantages:

[0022] The double taper plug sealing structure cooperates with the heat preservation box to form a stable low-temperature maintenance environment, ensures the temperature stability of the test piece during transfer and testing, and significantly improves the accuracy of low-temperature mechanical property test data; the innovative design of the push rod-blocking pin-guide groove linkage mechanism realizes continuous testing of multiple points in a single cooling cycle, greatly improving the testing efficiency; the standardized interface design is compatible with conventional hardness testers, breaking through the limitations of low-temperature special test equipment, reducing detection cost, and avoiding potential safety risks to operators of low-temperature equipment; the modular detachable structure cooperates with the multiple blocking pin parallel array design to collect hardness values at multiple points under low-temperature environment at one time, and the test efficiency is higher than that of single point hardness value measurement. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic diagram of the present application;

[0024] Figure 2 is a top view of Figure 1 ;

[0025] Figure 3 is a side view of Figure 1 . DETAILED DESCRIPTION

[0026] The technical solutions in the present application will be apparently and completely described below with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0027] A graphite raw material hardness test device with heat preservation performance, comprising a heat preservation box body 1, a taper plug one 5, a heat preservation upper cover 6, a taper plug two 7 and a push rod 8; the opening end of the upper end of the heat preservation box body 1 is sealed and blocked by the heat preservation upper cover 6, the side wall of the heat preservation box body 1 is provided with a through hole two, the push rod 8 arranged horizontally is slidably inserted into the through hole two during the test, and the taper plug two 7 is interference-inserted during non-test; the middle part of the heat preservation upper cover 6 is provided with a through hole one penetrating through the thickness direction thereof, the working part of the tester is inserted into the through hole one during the test, and the taper plug one 5 is interference-inserted during non-test.

[0028] Further, the heat preservation box body 1 and the heat preservation upper cover 6 are detachably fixedly connected through a plurality of screws 2.

[0029] Further, a sealing ring 3 is arranged between the heat preservation box body 1 and the heat preservation upper cover 6.

[0030] Further, a wear-resistant bushing is arranged at the contact position of the push rod 8 and the through hole two, the bushing is made of self-lubricating material, and is used for reducing the friction loss when the push rod slides.

[0031] Further, a guide groove is arranged on the inner bottom surface of the heat preservation box body 1, the guide groove is consistent with the pushing direction of the push rod 8, and is used for positioning the graphite raw material.

[0032] Further, a scale mark or a scale is arranged on the outer end of the push rod 8, which is used for displaying the pushing distance of the push rod 8 and ensuring equidistance pushing.

[0033] Further, a plurality of blocking pins 4 vertically arranged with the push rod 8 are inserted into the heat preservation box body 1.

[0034] Further, the plurality of blocking pins 4 are arranged in parallel and equidistance, which further ensures equidistance pushing and ensures the accuracy of the test.

[0035] The use method of the graphite raw material hardness test device with heat preservation performance, the method comprises the following steps:

[0036] S1: blocking the through hole one by the cone plug one 5, and blocking the through hole two by the cone plug two 7;

[0037] S2: placing the graphite raw material in the guiding groove on the inner bottom surface of the heat preservation box body 1 after taking it out from the low-temperature environment box, and blocking the heat preservation box body 1 by the heat preservation upper cover 6 to keep the temperature and transfer to the tester;

[0038] S3: taking down the cone plug two 7, inserting the push rod 8 into the through hole two, and taking down the cone plug one 5 to make the through hole one corresponding to the interface of the tester;

[0039] S4: driving the push rod 8 to make the graphite raw material contact with the first blocking pin 4, and inserting the working part of the tester through the through hole one to obtain the first point hardness value;

[0040] S5: pulling out the first blocking pin 4, continuing to drive the push rod 8 to make the graphite raw material contact with the second blocking pin 4, and inserting the working part of the tester through the through hole one to obtain the second point hardness value;

[0041] S6: repeating S5 to obtain the hardness values of all point positions in turn;

[0042] S7: removing the two hardness values with the maximum and minimum values, and taking the average value of the remaining hardness values as the hardness value of the graphite raw material.

[0043] It is apparent for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and range of equivalents of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims to which they relate.

[0044] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, and those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can be combined to form other embodiments which can be understood by those skilled in the art.

Claims

1. A method for using a graphite raw material hardness testing device with heat preservation performance, the device comprising a heat preservation box body (1), a cone plug one (5), a heat preservation upper cover (6), a cone plug two (7), and a push rod (8); the open end of the upper end of the heat preservation box body (1) is sealed and blocked by the heat preservation upper cover (6), the sidewall of the heat preservation box body (1) is provided with a through hole two, the through hole two is slidingly connected with the horizontally arranged push rod (8) during testing, and the through hole two is interference fitted with the cone plug two (7) when not testing; the middle part of the heat preservation upper cover (6) is provided with a through hole one, the through hole one is internally connected with the working part of the tester during testing, and the through hole one is interference fitted with the cone plug one (5) when not testing; a plurality of stop pins (4) are inserted into the heat preservation box body (1) and are arranged perpendicularly to the push rod (8); the method is characterized by the following: The method comprises the following steps: S1: blocking the through hole one by the taper plug one (5) and blocking the through hole two by the taper plug two (7); S2: taking out the graphite raw material from the low temperature environment box and placing it in the guide groove on the inner bottom surface of the heat preservation box body (1), blocking the heat preservation box body (1) by the heat preservation upper cover (6) to maintain the temperature and transfer to the tester; S3: removing the taper plug two (7), inserting the push rod (8) into the through hole two; removing the taper plug one (5) to make the through hole one corresponding to the tester interface; S4: pushing the push rod (8) to drive the graphite raw material to contact with the first stop pin (4), and the tester working part is inserted through the through hole one to obtain the first point hardness value; S5: pulling out the first stop pin (4), continuing to push the push rod (8) to drive the graphite raw material to contact with the second stop pin (4), and the tester working part is inserted through the through hole one to obtain the second point hardness value; S6: repeating S5 to obtain the hardness values of all points in turn; S7: removing the two largest and smallest hardness values, and taking the average value of all remaining hardness values as the hardness value of the graphite raw material.

2. The use of a graphite raw material hardness testing device with heat preservation performance according to claim 1, characterized in that: The heat preservation box body (1) and the heat preservation upper cover (6) are detachably fixedly connected by a plurality of screws (2).

3. The use of a graphite raw material hardness testing device with heat retention properties according to claim 1 or 2, characterized in that: A sealing ring (3) is arranged between the heat preservation box body (1) and the heat preservation upper cover (6).

4. The use of a graphite raw material hardness testing device with heat preservation performance according to claim 1, characterized in that: A wear-resistant bushing is arranged at the contact position of the push rod (8) and the through hole two.

5. The use of a graphite raw material hardness testing device with heat retention properties according to claim 4, characterized in that: The guide groove is consistent with the pushing direction of the push rod (8).

6. The use of a graphite raw material hardness testing device with heat retention properties according to claim 5, characterized in that: The outer end of the push rod (8) is provided with a scale mark or a scale.

7. The use of a graphite raw material hardness testing device with heat retention properties according to claim 6, characterized in that: A plurality of stop pins (4) are arranged in parallel and equidistantly.

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