High-temperature resistivity tester

Abstract

The utility model discloses a high-temperature resistivity tester which comprises an instrument desk, a high-temperature electric furnace is fixedly installed on the instrument desk through electric furnace supporting columns, stand columns are arranged on the instrument desk, an upper cross beam is connected between the stand columns, the upper cross beam is connected with an upper graphite electrode, and the upper graphite electrode extends into a hearth of the high-temperature electric furnace. A lifting device is installed in the instrument desk, a lower graphite electrode corresponding to the upper graphite electrode is connected to the lifting device, the lower graphite electrode extends into a hearth of the high-temperature electric furnace, the lifting device drives the lower graphite electrode to ascend, and a test sample is fixed in the hearth of the high-temperature electric furnace through clamping of the upper graphite electrode and the lower graphite electrode; the upper graphite electrode and the lower graphite electrode are connected with a constant-voltage constant-current stabilized voltage supply, two test probes are inserted into the side wall of the high-temperature electric furnace, the inner ends of the two test probes are in contact with a test sample in a hearth of the high-temperature electric furnace, and the other ends of the two test probes are connected with a voltmeter. The high-temperature resistivity tester provided by the utility model can measure the resistivity of the test sample at different temperatures.

Description

Technical Field

[0001] The utility model relates to the field of resistance measuring instruments, in particular to a high-temperature resistivity tester. Background Art

[0002] Carbon material is an important industrial material with the characteristics of good chemical stability, high temperature resistance, corrosion resistance, self-lubrication, low elastic modulus and good conductivity. Analyzing and testing the characteristics of carbon raw materials is an important step to ensure their quality and performance. Resistivity is a physical quantity used to represent the resistance characteristics of a material, which can reflect the conductive properties of carbon materials. Resistivity testing is an important means to evaluate the quality and performance of carbon materials. High temperature resistivity testing of carbon materials is an important parameter indicator for studying the physical conductive properties of carbon materials. Therefore, it is necessary to design a high temperature resistivity tester to test the conductive properties of carbon materials at high temperatures. Summary of the invention

[0003] The utility model provides a high temperature resistivity tester which is suitable for testing the electrical conductivity of carbon materials at high temperatures.

[0004] The technical solution adopted by the utility model is as follows: a high-temperature resistivity tester comprises an instrument platform, on which a high-temperature electric furnace is fixedly installed through electric furnace pillars, and columns are also arranged on the instrument platform, an upper crossbeam is connected between the columns, an upper graphite electrode is connected to the upper crossbeam, and the upper graphite electrode extends into the furnace of the high-temperature electric furnace, a lifting device is installed in the instrument platform, a lower graphite electrode corresponding to the upper graphite electrode is connected to the lifting device, and the lower graphite electrode extends into the furnace of the high-temperature electric furnace, the lifting device drives the lower graphite electrode to rise and fixes the test sample in the furnace of the high-temperature electric furnace by clamping the upper graphite electrode and the lower graphite electrode, the upper graphite electrode and the lower graphite electrode are connected to a constant-voltage and constant-current regulated power supply, and two measuring needles are plugged into the side wall of the high-temperature electric furnace, the inner ends of the two measuring needles are in contact with the test sample located in the furnace of the high-temperature electric furnace, and the other ends are connected to a voltmeter.

[0005] Furthermore, an insulating sleeve is fixedly installed on the side wall of the high-temperature electric furnace, the measuring needle passes through the insulating sleeve, a limit block is fixedly connected to the measuring needle, and a spring for pressing the limit block is arranged in the insulating sleeve.

[0006] Furthermore, a thermocouple for measuring the furnace temperature is arranged on the high-temperature electric furnace.

[0007] Furthermore, a pressure sensor is connected to the upper crossbeam, the upper graphite electrode is fixedly connected to the pressure sensor via an upper insulating plate, and an upper cooling water jacket is sleeved on the connecting end of the upper graphite electrode and the upper insulating plate.

[0008] Furthermore, the lifting device comprises a lifting rod, the upper end of which is fixedly connected to the lower graphite electrode via a lower insulating plate, and a lower cooling water jacket is sleeved on the connecting end of the lower graphite electrode and the lower insulating plate.

[0009] Furthermore, the lifting rod is a screw rod, the lower end of which is connected to a limit plate, the limit plate is vertically slidably matched with a guide rod fixedly installed in the instrument panel, a servo drive motor is installed in the instrument panel, the output end of the servo drive motor is matched with the lifting rod thread, and the servo drive motor drives the lifting rod to move up and down.

[0010] Furthermore, two small holes corresponding to the two measuring needles are arranged in the middle of the test sample.

[0011] When the high temperature resistivity tester of the utility model is used, one end of the test sample is placed on the lower graphite electrode, the lower graphite electrode is driven to rise by the lifting device to press the test sample against the upper graphite electrode and the sample is pressed tightly, then two high temperature measuring needles are inserted and in good contact with the test sample, the test sample is preheated by a high temperature electric furnace, and the test can be started, and the resistivity of the sample can be calculated by measuring the voltage between the two measuring needles and the constant current passing through the sample and substituting the two values ​​into the formula. The tester can measure the resistivity of the test sample at different temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0013] Figure 2 It is a structural schematic diagram of a high-temperature electric furnace of the utility model. DETAILED DESCRIPTION

[0014] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively and carefully below in conjunction with the accompanying drawings and preferred embodiments of the specification, but the protection scope of the present invention is not limited to the following specific embodiments.

[0015] like Figure 1 , Figure 2As shown, the high temperature resistivity tester of this embodiment includes an instrument platform 1, on which a high temperature electric furnace 10 is fixedly installed through an electric furnace support 21, and the instrument platform 1 is also provided with a column 5, between which an upper crossbeam 15 is connected, and an upper graphite electrode 11 is connected to the upper crossbeam 15, and the upper graphite electrode 11 extends into the furnace of the high temperature electric furnace 10, and a lifting device is installed in the instrument platform 1, and the lifting device is connected to a lower graphite electrode 8 corresponding to the upper graphite electrode 11, and the lower graphite electrode 11 is connected to the upper crossbeam 15. The graphite electrode 8 extends into the furnace of the high-temperature electric furnace 10. The lifting device drives the lower graphite electrode 8 to rise and fixes the test sample 9 in the furnace of the high-temperature electric furnace 10 by clamping the upper graphite electrode 11 and the lower graphite electrode 8. The upper graphite electrode 11 and the lower graphite electrode 8 are connected to a constant-voltage and constant-current regulated power supply. Two measuring needles 18 are plugged into the side wall of the high-temperature electric furnace 10. The inner ends of the two measuring needles 18 are in contact with the test sample 9 located in the furnace of the high-temperature electric furnace 10, and the other ends are connected to a voltmeter.

[0016] In this embodiment, an insulating sleeve 19 is fixedly installed on the side wall of the high-temperature electric furnace 10, and a measuring needle 18 passes through the insulating sleeve 19. A limit block 16 is fixedly connected to the measuring needle 18. A spring 17 for pressing the limit block 16 is arranged in the insulating sleeve 19, so that the measuring needle 18 can maintain good contact with the test sample 9.

[0017] As a further preferred solution, two small holes corresponding to the two measuring pins 18 are provided in the middle of the test sample 9, and the measuring pins 18 are inserted into the corresponding small holes.

[0018] In order to detect the furnace temperature of the high-temperature electric furnace 10 in real time, a thermocouple 20 for measuring the furnace temperature is provided on the high-temperature electric furnace 10 .

[0019] In this embodiment, a pressure sensor 14 is connected to the upper crossbeam 15, and the upper graphite electrode 11 is fixedly connected to the pressure sensor 14 through the upper insulating plate 13, and the upper cooling water jacket 12 is sleeved at the connection end of the upper graphite electrode 11 and the upper insulating plate 13. The lifting device includes a lifting rod 4, the upper end of the lifting rod 4 is fixedly connected to the lower graphite electrode 8 through the lower insulating plate 6, and the lower cooling water jacket 7 is sleeved at the connection end of the lower graphite electrode 8 and the lower insulating plate 6. When the lifting rod 4 drives the lower graphite electrode 8 and the test sample 9 to rise and contact with the upper graphite electrode 11, the pressure sensor 14 controls the lifting rod 4 to stop rising when the set value is measured, thereby avoiding excessive extrusion.

[0020] Specifically, in this embodiment, the lifting rod 4 is a screw rod, and the lower end of the lifting rod 4 is connected to a limit plate 3. The limit plate 3 is vertically slidably matched with a guide rod 2 fixedly installed in the instrument panel 1. A servo drive motor 22 is installed in the instrument panel 1. The output end of the servo drive motor 22 is threadedly matched with the lifting rod 4, and the servo drive motor 22 drives the lifting rod 4 to move up and down.

[0021] With the help of the teachings in the foregoing description and the related drawings, a person skilled in the art will be able to think of many modifications and other embodiments of the present invention. Therefore, it is to be understood that the present invention is not limited to the specific embodiments disclosed, and modifications and other embodiments are considered to be included within the scope of the appended claims. Although specific terms are used herein, they are used only in a general and descriptive sense and not for limitation.

Claims

1. High temperature resistivity tester, characterized in that, The invention comprises an instrument panel (1), a high-temperature electric furnace (10) being fixedly mounted on the instrument panel (1) via an electric furnace support (21), the instrument panel (1) being further provided with upright posts (5), an upper crossbeam (15) being connected between the upright posts (5), an upper graphite electrode (11) being connected to the upper crossbeam (15), and the upper graphite electrode (11) extending into the furnace of the high-temperature electric furnace (10), a lifting device being installed in the instrument panel (1), a lower graphite electrode (8) corresponding to the upper graphite electrode (11) being connected to the lifting device, and the lower graphite electrode (8) The electrode (8) extends into the furnace of the high-temperature electric furnace (10), the lifting device drives the lower graphite electrode (8) to rise and fix the test sample (9) in the furnace of the high-temperature electric furnace (10) through the clamping of the upper graphite electrode (11) and the lower graphite electrode (8), the upper graphite electrode (11) and the lower graphite electrode (8) are connected to a constant voltage and constant current regulated power supply, two measuring needles (18) are inserted into the side wall of the high-temperature electric furnace (10), the inner ends of the two measuring needles (18) are in contact with the test sample (9) located in the furnace of the high-temperature electric furnace (10), and the other ends are connected to a voltmeter.

2. The high temperature resistivity tester according to claim 1, characterized in that: An insulating sleeve (19) is fixedly mounted on the side wall of the high-temperature electric furnace (10); the measuring needle (18) passes through the insulating sleeve (19); a limit block (16) is fixedly connected to the measuring needle (18); and a spring (17) for pressing the limit block (16) is arranged in the insulating sleeve (19).

3. The high temperature resistivity tester according to claim 1, characterized in that: The high-temperature electric furnace (10) is provided with a thermocouple (20) for measuring the furnace temperature.

4. The high temperature resistivity tester according to claim 1, characterized in that: A pressure sensor (14) is connected to the upper crossbeam (15), the upper graphite electrode (11) is fixedly connected to the pressure sensor (14) via an upper insulating plate (13), and an upper cooling water jacket (12) is sleeved on the connecting end between the upper graphite electrode (11) and the upper insulating plate (13).

5. The high temperature resistivity tester according to claim 1, characterized in that: The lifting device comprises a lifting rod (4), the upper end of the lifting rod (4) being fixedly connected to the lower graphite electrode (8) via a lower insulating plate (6), and the connecting end between the lower graphite electrode (8) and the lower insulating plate (6) being sleeved with a lower cooling water jacket (7).

6. The high temperature resistivity tester according to claim 5, characterized in that: The lifting rod (4) is a screw rod, the lower end of the lifting rod (4) is connected to a limit plate (3), the limit plate (3) is vertically slidably matched with a guide rod (2) fixedly installed in the instrument panel (1), a servo drive motor (22) is installed in the instrument panel (1), the output end of the servo drive motor (22) is threadedly matched with the lifting rod (4), and the servo drive motor (22) drives the lifting rod (4) to move up and down.

7. The high temperature resistivity tester according to claim 1, characterized in that: Two small holes corresponding to the two measuring needles (18) are arranged in the middle of the test sample (9).

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