Device for detecting carbon fiber resistance

Abstract

The utility model discloses a device for detecting carbon fiber resistance, which comprises a measuring platform provided with a measuring clamp. The measuring clamp comprises a connecting plate made of an insulating material, two ends of the connecting plate are respectively and fixedly provided with a measuring electrode, and each measuring electrode is an L-shaped copper plate formed by a horizontal side plate and a vertical side plate; a horizontal side plate of the measuring electrode is fixedly connected with the connecting plate, and a vertical side plate of the measuring electrode is used for detecting carbon fibers; a measuring circuit is arranged in the measuring platform and connected with the measuring electrodes through wires to form a complete measuring loop. According to the carbon fiber resistivity measuring device, the carbon fiber can be conveniently fixed and measured by one person, the influence of the contact resistance of the universal meter on the actual measured value is eliminated, and the measuring accuracy of the carbon fiber resistivity is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of device for detecting carbon fiber resistance, belong to carbon fiber resistance detection technical field. BACKGROUND

[0002] Carbon fiber has a series of excellent properties such as high specific strength, high specific modulus, heat resistance, corrosion resistance, electrical conductivity, and using carbon fiber to prepare composite materials can achieve the purpose of increasing strength, preventing static electricity, preventing electromagnetic waves, etc. Before the mid-1990s, aerospace and sports and leisure industries have been the main market for high-performance carbon fibers. Under the background of high-speed industrialization, carbon fiber has been deeply applied to the core of the industrial field, replacing metal and concrete materials to meet the requirements of environmental protection, safety and energy saving. Volume resistivity is an important performance indicator of carbon fiber, and improving the measurement accuracy of carbon fiber volume resistivity is of great significance to the design and safe application of carbon fiber composite materials.

[0003] In the prior art, the common measurement instruments for carbon fiber volume resistivity include multimeter, four-probe instrument and other special resistance testers. The contact resistance during measurement by the above conventional resistance testers has an impact on the actual measurement value, and the resistance value is not accurately measured. In addition, during measurement, the carbon fiber is long and inconvenient to operate, and one person needs to straighten the carbon fiber and another person needs to measure, which is quite troublesome.

[0004] As can be seen from the above, the prior art has obvious inconvenience and defects in actual use, so it is necessary to improve. INVENTION CONTENTS

[0005] The utility model provides a kind of device for detecting carbon fiber resistance according to the deficiency in the background art, carbon fiber can be conveniently fixed and measured, one person can conveniently complete, and the influence of the contact resistance of multimeter on actual measurement value is eliminated, and the measurement accuracy of carbon fiber resistivity is improved.

[0006] To solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A kind of device for detecting carbon fiber resistance, including measurement platform, measurement platform is equipped with measurement clamp;

[0008] The measurement clamp includes a connecting plate of insulating material, two ends of the connecting plate are respectively fixed with a measurement electrode, and the measurement electrode is an L-shaped copper plate composed of a horizontal side plate and a vertical side plate;

[0009] The horizontal side plate of the measurement electrode is fixedly connected with the connecting plate, and the vertical side plate of the measurement electrode is used to detect carbon fiber;

[0010] The measuring platform is internally provided with a measuring circuit, and the measuring circuit is connected with the measuring electrodes through wires to form a complete measuring loop.

[0011] Further, the upper surface of the measuring platform is further provided with an insulating pad, which is fixed on the measuring platform by bolts and forms good insulation with the measuring platform; the insulating pad is made of insulating plastic and has a thickness of not less than 20 mm and covers the complete measuring area.

[0012] Further, a placing groove is formed in the insulating pad, and the carbon fiber is placed in the placing groove after being straightened.

[0013] Further, the connecting plate is made of one of polyoxymethylene, polyether ether ketone or polyether ketone ketone engineering plastics.

[0014] Further, the connecting plate has a thickness of not less than 15 mm, and the two measuring electrodes are fixedly connected with the connecting plate by bolts, and the distance between the two measuring electrodes is 1 meter.

[0015] Further, the measuring electrode copper plate has a thickness of not less than 2 mm, and the electrode knife edge at the lower end of the vertical side plate of the measuring electrode has a thickness of 0.1-0.15 mm and is provided with a rounded corner.

[0016] Further, a wiring terminal is welded on the measuring electrode, and the wire of the measuring circuit is connected with the wiring terminal to form a measuring loop.

[0017] Further, two carbon fiber fixing devices are further arranged on the measuring platform and are arranged on the two sides of the measuring platform.

[0018] Further, the carbon fiber fixing device comprises a base, a swing arm is hingedly connected to the base, an insulating pressing head is arranged below the front end of the swing arm, a pulling arm is hingedly connected to the base, a connecting arm is arranged between the swing arm and the pulling arm, one end of the connecting arm is hingedly connected to the middle position of the pulling arm, and the other end of the connecting arm is hingedly connected to the rear end of the swing arm, when the pulling arm is rotated, the swing arm is swung downward through the connecting arm, so that the insulating pressing head is pressed against the carbon fiber bundle.

[0019] Further, a touch display is further arranged on the measuring platform, and the touch display is used to display the data obtained by the measuring circuit.

[0020] Compared with the prior art, the measuring electrode at the two ends of the measuring clamp is pressed against the two ends of the carbon fiber, the measuring circuit is connected with the measuring electrode through wires to form a complete measuring loop, the resistance of the carbon fiber can be conveniently measured, the volume resistivity of the sample is calculated through the volume resistivity formula, and the volume resistivity is displayed on the touch display, so that the detection is convenient and the measurement is accurate.

[0021] The utility model will be illustrated in detail below in combination with the drawings and embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the three-dimensional structure schematic diagram of the utility model;

[0023] Figure 2 It is the structure schematic diagram of the measuring clamp;

[0024] Figure 3 It is the structure schematic diagram of the carbon fiber fixing device in the utility model.

[0025] In the drawings,

[0026] 1-measuring platform, 2-touch display, 3-insulating pad, 4-placing groove, 5-connection plate, 6-measuring electrode, 7-bolt, 8-carbon fiber fixing device, 9-swinging arm, 10-insulating pressure head, 11-connection arm, 12-pulling arm, 13-base. DETAILED DESCRIPTION

[0027] In order to have more clear understanding of the technical features, purposes and effects of the utility model, the specific implementation mode of the utility model will be illustrated in combination with the drawings.

[0028] As Figure 1 Indicated, the utility model provides a kind of device for detecting carbon fiber resistance, including measuring platform 1, and measuring platform 1 is equipped with measuring clamp;

[0029] The measuring clamp includes a connection plate 5 of insulating material, and one measuring electrode 6 is fixed at the both ends of the connection plate 5, and the measuring electrode 6 is L-shaped copper plate formed by horizontal side plate and vertical side plate;

[0030] The horizontal side plate of the measuring electrode 6 is fixedly connected with the connection plate 5, and the vertical side plate of the measuring electrode 6 is used to detect carbon fiber;

[0031] There is measuring circuit in the measuring platform, and the measuring circuit is connected with the measuring electrode by wire, to form complete measuring loop.

[0032] When detecting, a certain length of carbon fiber is placed on the measuring platform 1, and the both ends of the measuring electrode 6 at the both ends of the measuring clamp are pressed to the both ends of the carbon fiber, and after the measuring circuit is powered on, the resistance of the carbon fiber can be conveniently measured.

[0033] The upper surface of the measuring platform 1 is also paved with insulating pad 3, and the insulating pad 3 is fixed on the measuring platform 1 by bolt, and the insulating pad 3 and the measuring platform 1 form good insulation;The insulating pad 3 is composed of insulating plastic, and the thickness is not less than 20mm, and covers complete measuring area.

[0034] In some embodiments, a placing groove 4 is formed on the insulating base plate 3, and the carbon fiber is placed in the placing groove 4 after being straightened. It is emphasized that the placing groove 4 cannot be too deep to ensure that the measuring electrode 6 can be in good contact with the carbon fiber.

[0035] The connecting plate 5 is made of one of the engineering plastics such as polyoxymethylene (POM), polyether ether ketone (PEEK) or polyether ketone ketone (PEKK), which has the characteristics of high modulus, low thermal expansion coefficient and good insulation performance.

[0036] The thickness of the connecting plate 5 is not less than 15 mm, and the connecting plate 5 is fixedly connected with the measuring electrode 6 through the bolt 7. The distance between the two measuring electrodes 6 is 1 meter (±0.5 mm).

[0037] The thickness of the copper plate of the measuring electrode 6 is not less than 2 mm, the thickness of the electrode knife edge at the lower end of the vertical side plate of the measuring electrode 6 is 0.1-0.15 mm, and the electrode knife edge is provided with a rounded corner.

[0038] The measuring electrode 6 is welded with a terminal, the wire of the measuring circuit is connected with the terminal, and a measuring loop is formed.

[0039] In some embodiments, two carbon fiber fixing devices 8 are further arranged on the measuring platform 1, and the two carbon fiber fixing devices 8 are arranged on the two sides of the measuring platform 1.

[0040] The carbon fiber fixing device 8 comprises a base 13, a swing arm 9 is hinged on the base 13, an insulating pressure head 10 is arranged below the front end of the swing arm 9, a pulling arm 12 is hinged on the base 13, a connecting arm 11 is arranged between the swing arm 9 and the pulling arm 12, one end of the connecting arm 11 is hinged on the middle position of the pulling arm 12, and the other end is hinged on the rear end of the swing arm 9. When the pulling arm 12 is rotated, the swing arm 9 is swung downward through the connecting arm 11, so that the insulating pressure head 10 tightly presses the carbon fiber bundle.

[0041] The touch display 2 is further arranged on the measuring platform 1, and is used to display the data obtained by the measuring circuit, display the current voltage, current and resistance calculation value, display not less than 5 resistance historical measurement values and average value calculation results, and configure a start key and a clear key, so that a single data or all data can be deleted.

[0042] During the test, a carbon fiber bundle sample with a length of about 1.5 m is intercepted, the carbon fiber bundle is placed in the placing groove 4, one end of the bundle is pressed by the carbon fiber fixing device 8, then the bundle is straightened, and the other end of the bundle is pressed by the other carbon fiber fixing device 8; then the measuring clamp is placed on the sample, the start key on the touch display 2 is clicked to start the measurement, after enough effective data is obtained, the average value button on the display is clicked to calculate the average value, and the data is recorded.

[0043] The center distance of the two measuring electrodes 6 is l, the volume resistivity of the sample is calculated by the volume resistivity formula: S=R(s / l), wherein S is the volume resistivity of the sample, R is the resistance of the sample, and s is the cross-sectional area of the carbon fiber sample. The formula S=RT / (lρ) can also be used, wherein T is the linear density of the sample, and p is the density of the sample. The resistance and resistivity can be directly read from the touch display 2, the influence of the contact resistance of the multimeter on the actual measurement value is eliminated, and the measurement accuracy of the resistivity of the carbon fiber is improved.

[0044] The test data of the three samples are shown in the following table:

[0045] Resistance / Ω Linear density / (g m -1 ) Bulk density / (g-cm -3 ) Resistivity / (Ω-cm) Sample 1 39.88 0.802 1.814 1.76 x 10 -3 ]] Sample 2 39.80 0.802 1.814 1.76 x 10 -3 ]] Sample 2 39.83 0.802 1.814 1.76 x 10 -3 ]]>

[0046] The above is an example of the best implementation of the present application, wherein the parts not described in detail are the common knowledge of ordinary technical personnel in the art. The protection scope of the present application is subject to the content of the claims, and any equivalent transformation based on the technical inspiration of the present application is also within the protection scope of the present application.

Claims

1. An apparatus for detecting a carbon fiber resistance, characterized by: The utility model relates to a carbon fiber tensile strength testing device, which comprises a measuring platform (1) provided with a measuring clamp; The measuring clamp comprises an insulating connecting plate (5), two measuring electrodes (6) are fixed at the two ends of the connecting plate (5) respectively, and the measuring electrode (6) is an L-shaped copper plate composed of a horizontal side plate and a vertical side plate; The horizontal side plate of the measuring electrode (6) is fixedly connected with the connecting plate (5), and the vertical side plate of the measuring electrode (6) is used for detecting carbon fibers; The measuring platform is provided with a measuring circuit, and the measuring circuit is connected with the measuring electrode through a wire to form a complete measuring loop.

2. A device for detecting the resistance of carbon fibers as claimed in claim 1, characterized in that The upper surface of the measuring platform (1) is also paved with an insulating pad (3), the insulating pad (3) is fixed on the measuring platform (1) through bolts, the insulating pad (3) and the measuring platform (1) form good insulation, the insulating pad (3) is composed of insulating plastic, the thickness is not less than 20 mm, and the insulating pad (3) covers the complete measuring area.

3. A device for detecting the resistance of carbon fibers as claimed in claim 2, characterized in that: A placing groove (4) is formed in the insulating pad (3), and the carbon fibers are placed in the placing groove (4) after being straightened.

4. A device for detecting the resistance of carbon fibers as defined in claim 1, characterized in that: The connecting plate (5) is made of one kind of engineering plastics such as polyformaldehyde, polyether ether ketone or polyether ketone ketone.

5. The apparatus for detecting resistance of carbon fiber according to claim 1, wherein: The thickness of the connecting plate (5) is not less than 15 mm, the connecting plate (5) is fixedly connected with the measuring electrode (6) through bolts (7), and the distance between the two measuring electrodes (6) is 1 m.

6. A device for detecting the resistance of carbon fibers as defined in claim 1, characterized in that: The thickness of the copper plate of the measuring electrode (6) is not less than 2 mm, the thickness of the electrode knife edge at the lower end of the vertical side plate of the measuring electrode (6) is 0.1-0.15 mm, and the electrode knife edge is provided with a rounded corner.

7. A device for detecting the resistance of carbon fibers as defined in claim 1, characterized in that: A wiring terminal is welded on the measuring electrode (6), the wire of the measuring circuit is connected with the wiring terminal to form a measuring loop.

8. A device for detecting the resistance of carbon fibers as defined in claim 1, characterized in that: Two carbon fiber fixing devices (8) are further arranged on the measuring platform (1), and the two carbon fiber fixing devices (8) are arranged on the two sides of the measuring platform (1).

9. A device for detecting the resistance of carbon fibers as claimed in claim 8, characterized in that: The carbon fiber fixing device (8) comprises a base (13), a swing arm (9) is hinged to the base (13), an insulating pressing head (10) is arranged below the front end of the swing arm (9), a pulling arm (12) is hinged to the upper side of the base (13), a connecting arm (11) is arranged between the swing arm (9) and the pulling arm (12), one end of the connecting arm (11) is hinged to the middle position of the pulling arm (12), the other end is hinged to the rear end of the swing arm (9), when the pulling arm (12) is rotated, the swing arm (9) is swung downward through the connecting arm (11), so that the insulating pressing head (10) presses the carbon fiber bundle.

10. The apparatus for detecting resistance of carbon fiber according to claim 1, wherein: A touch display (2) is further arranged on the measuring platform (1), and the touch display (2) is used for displaying the data obtained by the measuring circuit.

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