A device for testing the magnetic permeability of absorbing materials

Abstract

The present invention provides a device for testing the magnetic permeability of an absorbing material, comprising: a rotating portion comprising a first rotating member and a second rotating member, the first rotating member and the second rotating member rotating in conjunction with each other and driving the absorbing material; an inductance testing portion having an opening for accommodating the passage of the absorbing material, the testing coil being disposed on the opening; and a thickness measuring portion comprising a first thickness measuring member and a second thickness measuring member, the first and second thickness measuring members being disposed opposite each other, with a test area for the absorbing material to pass between the first and second thickness measuring members; wherein the inductance testing portion and the thickness measuring portion are disposed between the first and second rotating members. The device for testing the magnetic permeability of an absorbing material provided by the present invention can continuously test the magnetic permeability of the absorbing material without damaging the absorbing material, thereby achieving continuous testing of the magnetic properties of the absorbing material.

Description

Technical Field

[0001] The present invention relates to the technical field of wave-absorbing material detection, and in particular to a device for testing the magnetic permeability of wave-absorbing materials. Background Art

[0002] Absorbing materials absorb incident electromagnetic waves and convert them into heat or other forms of energy, effectively addressing electromagnetic interference and radiation pollution. Magnetic permeability is expressed as a complex number: μ = μ' - jμ", where the real part of the complex permeability, μ', indicates the ease with which magnetic flux is concentrated. When attached to an antenna, it has the effect of extending communication range, for example. The imaginary part, μ", is the magnetic loss term, indicating the magnitude of the absorption effect. This imaginary part absorbs unwanted electromagnetic waves and converts them into heat, achieving the desired absorption effect. This makes magnetic permeability one of the most important performance indicators of absorbing materials.

[0003] However, there is a problem in the actual process of testing the magnetic permeability of absorbing materials: the current method of testing the magnetic permeability of absorbing materials is mainly to first use a die to cut the absorbing material into a Φ7×3mm ring, and then use an impedance analyzer and a fixture for testing. However, the impedance analyzer is expensive, and the fixture requires frequent maintenance and replacement, which increases the testing cost. In addition, it will damage the absorbing material and is not suitable for continuous testing of absorbing materials. Summary of the Invention

[0004] The device for detecting the magnetic permeability of an absorbing material provided by the present invention can continuously detect the magnetic permeability of the absorbing material without destroying the absorbing material, thereby realizing continuous detection of the magnetic properties of the absorbing material.

[0005] To address the aforementioned issues, the present invention provides a device for testing the magnetic permeability of an absorbing material. The device comprises: a rotating portion, comprising a first rotating member and a second rotating member, the first rotating member and the second rotating member rotating in conjunction with each other and driving the absorbing material to move; an inductance testing portion, wherein the inductance testing portion is provided with an opening for accommodating the passage of the absorbing material, and a test coil is disposed on the opening; and a thickness measuring portion, comprising a first thickness measuring member and a second thickness measuring member, the first and second thickness measuring members being disposed opposite each other, with a test area for the absorbing material to pass between the first and second thickness measuring members. The inductance testing portion and the thickness measuring portion are disposed between the first and second rotating members.

[0006] Compared with the prior art, this technical solution achieves the following technical effects: non-destructive, continuous testing of absorbing materials. In the device for testing the magnetic permeability of absorbing materials of the present invention, the rotating portion controls the direction and speed of the absorbing material's movement, the inductance measuring portion measures the absorbing material's inductance, and the thickness measuring portion measures the absorbing material's thickness. During the testing process, the absorbing material travels from the first rotating member, passes through the inductance measuring portion and the thickness measuring portion, and is then reeled in by the second rotating member. The device for testing the magnetic permeability of absorbing materials provided by the present invention enables continuous testing of the magnetic permeability of the absorbing material without damaging it, thus achieving continuous testing of the magnetic properties of the absorbing material.

[0007] In one embodiment of the present invention, the thickness measuring portion is located between the inductance testing portion and the second rotating member.

[0008] Compared with existing technologies, this technical solution achieves the following technical effects: more accurate test results. Because the thickness measurement unit uses instruments such as lasers during the test process, if the thickness measurement unit is tested first, it will affect the test results of the inductance measurement unit that is tested later. Therefore, the configuration of the inductance measurement unit for testing first and the thickness measurement unit for testing later can effectively prevent the influence between the two detection units, resulting in more accurate test results.

[0009] In one embodiment of the present invention, the testing device further includes: a magnetic permeability calculation device, and the inductance testing part and the thickness measuring part are respectively connected to the magnetic permeability calculation device.

[0010] Compared to existing technologies, this solution achieves the following technical benefits: automatic calculation of magnetic permeability. After obtaining the inductance and thickness values ​​of the absorber material using the inductance tester and thickness measurement unit, the magnetic permeability result still needs to be calculated using a formula. Compared to manual calculations, using the magnetic permeability calculation device is faster and more accurate.

[0011] In one embodiment of the present invention, the inductance testing unit further includes: a digital bridge device, which is connected to the testing coil and the magnetic permeability calculation device respectively.

[0012] Compared with existing technologies, this technical solution achieves the following technical benefits: using a digital bridge for inductance testing instead of an impedance analyzer, resulting in a more affordable solution. Existing permeability testing directly uses an impedance analyzer, which is expensive and easily damaged. In this application, an impedance analyzer is first used to determine the thickness coefficient for different material thicknesses. Subsequently, a digital bridge device and a thickness measurement unit are used to determine the inductance and thickness of the absorbing material, allowing the magnetic permeability of the absorbing material to be calculated. The testing device in this application is 70% cheaper than an impedance analyzer, thereby reducing the cost of testing absorbing materials.

[0013] In one embodiment of the present invention, the testing device further includes: a marking portion, which is disposed near the second rotating member and is connected to the magnetic permeability calculation device.

[0014] Compared to the prior art, this technical solution achieves the following technical effects: marking the location of unqualified absorbing material. The marking portion is connected to a magnetic permeability calculation device. After the magnetic permeability calculation device detects an abnormality in the magnetic permeability of the absorbing material, the marking portion can mark the area of ​​the abnormal absorbing material. The marking portion is positioned near the second rotating member because the absorbing material moves toward the second rotating member, and the marking portion has a certain reaction time to the alarm of the magnetic permeability calculation device, during which the absorbing material continues to move. Therefore, the position of the marking portion is calculated and balanced with the absorbing material's movement speed and reaction time, allowing the marking portion to accurately mark the location of unqualified absorbing material.

[0015] In one embodiment of the present invention, a printing device is provided in the marking portion.

[0016] Compared with the existing technology, this technical solution achieves the following technical effects: using printed labels for marking. The printing device can print out labels and affix them to locations where the absorbing material has abnormal magnetic permeability. Through the labels, workers can quickly identify the abnormal locations and take appropriate measures to deal with the absorbing material with abnormal magnetic permeability.

[0017] In one example of the present invention, the inductance testing unit further includes: a first skeleton, which is arranged on the outside of the test coil; and a second skeleton, which is arranged on the inside of the test coil; wherein the test coil is arranged between the first skeleton and the second skeleton, and the test coil is wound on the second skeleton.

[0018] Compared to existing technologies, this technical solution achieves the following advantages: The first and second frames enclose the test coil within the inductance test section, protecting it from external interference and damage. Furthermore, the first and second frames themselves do not affect the test coil's detection. Furthermore, the test coil is wound around the inner second frame, keeping it closer to the absorbing material and enabling more sensitive detection.

[0019] In one embodiment of the present invention, a first coil hole and a second coil hole are provided on the first frame, and the test coil passes through the first coil hole and the second coil hole respectively.

[0020] Compared with the existing technology, this technical solution achieves the following technical effects: it facilitates the connection of other devices to the test coil. During the actual testing process, the test coil also needs to be connected to various conversion devices. However, the test coil is protected within the protective layer formed by the first and second frames. Therefore, the first and second coil holes are provided on the outer first frame. The first and second coil holes can accommodate the test coil to pass through, so that the test coil can be connected to the devices outside the first frame.

[0021] In one embodiment of the present invention, an epoxy resin layer is provided between the first frame and the test coil; and / or an epoxy resin layer is provided between the second frame and the test coil.

[0022] Compared to existing technologies, this technical solution achieves the following technical benefits: It strengthens the connection between the test coil and the frame. Since the test coil is not fixedly connected to either the first or second frame, an epoxy resin layer is provided between the test coil and the first or second frame. This layer secures the connection between the test coil and the frame, preventing the test coil from slipping.

[0023] In one embodiment of the present invention, the rotating portion further includes: a power device, which is connected to the first rotating member and the second rotating member respectively.

[0024] Compared to existing technologies, this technical solution achieves the following technical effects: It provides power to the movement of the first and second rotating members. A power device is connected to each of the first and second rotating members to control their movement, thereby causing the absorbing material to pass through the inductance testing section and thickness measurement section at a set speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic structural diagram of an inductance testing unit provided in an embodiment of the present invention.

[0026] Figure 2 A schematic structural diagram of a device for testing the magnetic permeability of an absorbing material provided in an embodiment of the present invention.

[0027] Figure 3 A schematic structural diagram of a rotating part provided in an embodiment of the present invention.

[0028] Figure 4 A schematic diagram of the connection structure of the inductance testing unit provided in an embodiment of the present invention.

[0029] Figure 5 This is a schematic structural diagram of a thickness measurement unit provided by an embodiment of the present invention.

[0030] Figure 6A connection diagram of a magnetic permeability calculation device provided in an embodiment of the present invention.

[0031] Description of reference numerals:

[0032] 100-testing device; 110-rotating part; 111-first rotating member; 112-second rotating member; 113-power device; 120-inductance testing part; 121-test coil; 122-digital bridge device; 123-first skeleton; 124-second skeleton; 125-first coil hole; 126-second coil hole; 127-through opening; 130-thickness measuring part; 131-first thickness measuring member; 132-second thickness measuring member; 133-testing area; 140-magnetic permeability calculating device; 150-marking part; 151-printing device; 200-absorbing material. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below.

[0034] Example 1:

[0035] See also Figure 1-6 This embodiment provides a device for testing the magnetic permeability of an absorbing material. The testing device 100 includes a rotating portion 110, comprising a first rotating member 111 and a second rotating member 112. The first rotating member 111 and the second rotating member 112 rotate in conjunction with each other and drive the absorbing material 200 to move; an inductance testing portion 120, comprising an opening 127 for accommodating the absorbing material 200, and a test coil 121 disposed on the opening 127; and a thickness measuring portion 130, comprising a first thickness measuring member 131 and a second thickness measuring member 132. The first and second thickness measuring members 131 and 132 are disposed opposite each other, with a test area 133 defined between the first and second thickness measuring members 131 and 132 for the absorbing material 200 to pass through. The inductance testing portion 120 and the thickness measuring portion 130 are disposed between the first and second rotating members 111 and 112.

[0036] The rotating portion 110 controls the movement of the absorbing material 200. A first rotating member 111 and a second rotating member 112 are fixedly connected to the absorbing material 200. The first rotating member 111 unwinds the absorbing material 200, while the second rotating member 112 rewinds the absorbing material 200. Both the first rotating member 111 and the second rotating member 112 are cylindrical in shape. Before testing the absorbing material 200, the absorbing material 200 is fully wound on the first rotating member 111. After testing is complete, the absorbing material 200 is fully wound on the second rotating member 112. During testing, the first and second rotating members 111, 112 rotate in the same direction, causing the absorbing material 200 to move from the first rotating member 111 to the second rotating member 112. During this movement, the absorbing material 200 is straightened and moves at a set speed.

[0037] The inductance testing unit 120 is used to measure the inductance of the absorbing material 200 between the first rotating member 111 and the second rotating member 112. The inductance testing unit 120 is cylindrical in shape, with a central opening 127 disposed therein. This opening 127 is designed to allow the absorbing material 200 to pass through the unit, enabling the unit 120 to comprehensively test all absorbing material 200 passing through it. A test coil 121 is disposed within the unit 120 and surrounds the opening 127, ensuring that all absorbing material 200 passing through the opening 127 is detected by the test coil 121.

[0038] In a specific embodiment, the test coil 121 is an enameled wire, and the diameter of the enameled wire is 0.1-1.5 mm, preferably 0.5-0.8 mm.

[0039] In a specific embodiment, the number of winding turns of the test coil 121 is 10-100 turns, preferably 30-50 turns.

[0040] The thickness measurement unit 130 is used to measure the thickness of the absorbing material 200. Since the thickness of the absorbing material 200 after manufacture is not uniform, there is a certain degree of variation in the thickness of the same roll of absorbing material 200. Furthermore, the thickness of the absorbing material 200 can affect the measured magnetic permeability. Therefore, thickness measurement is performed using first and second thickness measurement devices 131, 132, located on either side of the absorbing material 200. The absorbing material 200 moves horizontally through a test area 133 between the first and second thickness measurement devices 131, 132. Precision lasers are installed on each of the first and second thickness measurement devices 131, 132. The first and second thickness measurement devices 131, 132 are arranged in a U-shaped arrangement, facing each other and fixedly connected. They accurately measure the thickness of the absorbing material 200 by measuring the distance between two light spots on the upper and lower surfaces of the absorbing material 200.

[0041] During the testing process, the absorbing material 200 moves from the first rotating member 111, passes through the inductance testing unit 120 and the thickness testing unit 130, and is then reeled in by the second rotating member 112. The device for testing the magnetic permeability of the absorbing material provided by the present invention can continuously test the magnetic permeability of the absorbing material 200 without damaging the absorbing material 200, thereby achieving continuous testing of the magnetic properties of the absorbing material 200.

[0042] Example 2:

[0043] Based on Example 1, see Figure 1-6 The thickness measuring portion 130 is located between the inductance testing portion 120 and the second rotating member 112 .

[0044] During the inspection process of the absorbing material 200, the absorbing material 200 travels from the first rotating member 111, passes through the inductance measuring unit 120, then through the thickness measuring unit 130, and finally is reeled up by the second rotating member 112. Because the thickness measuring unit 130 utilizes instruments such as lasers during the inspection process, placing the thickness measuring unit 130 at the front end of the inductance measuring unit 120 would affect the measurement results of the inductance measuring unit 120. While placing the thickness measuring unit 130 at a distance from the front end of the inductance measuring unit 120 can prevent the thickness measuring unit 130 from affecting the inductance measuring unit 120's inspection results, this increases the distance between the first rotating member 111 and the second rotating member 112, making the inspection device excessively bulky.

[0045] Example 3:

[0046] Based on Example 1, see Figure 1-6The testing device 100 further includes: a magnetic permeability calculation device 140 , and the inductance testing unit 120 and the thickness measuring unit 130 are respectively connected to the magnetic permeability calculation device 140 .

[0047] After the inductance testing unit 120 and the thickness measurement unit 130 measure the inductance and thickness of the absorbing material 200, calculation is required to obtain the magnetic permeability value. To quickly calculate the magnetic permeability, the inductance testing unit 120 and the thickness measurement unit 130 are communicatively connected to the magnetic permeability calculation device 140. The inductance and thickness data measured by the inductance testing unit 120 and the thickness measurement unit 130 are transmitted to the magnetic permeability calculation device 140, and the magnetic permeability calculation device 140 calculates the magnetic permeability result of the absorbing material 200.

[0048] In a specific embodiment, the magnetic permeability calculation device 140 is a computer, in which software for calculating magnetic permeability is installed. The computer is also equipped with a display to display the calculation results.

[0049] Example 4:

[0050] Based on Example 3, see Figure 1-6 The inductance testing unit 120 further includes a digital bridge device 122 , which is connected to the testing coil 121 and the magnetic permeability calculation device 140 , respectively.

[0051] The digital bridge device 122 is used to measure the inductance of the absorbing material 200. The digital bridge device 122 is provided with at least two terminals, each of which is connected to the digital bridge device 122 and the test coil 121. The digital bridge device 122 can measure the resistance R, inductance L, capacitance C, dissipation factor D, and quality factor Q of the absorbing material 200. The digital bridge device 122 has four available frequencies: 100 Hz, 120 Hz, 1 kHz, and 10 kHz. The digital bridge device 122 has four available voltages: 0.3 V and 1.0 V. The digital bridge device 122 has two available internal resistances: 30 Ω and 100 Ω. The digital bridge device 122 has two available equivalent circuits: series and parallel. The digital bridge device 122 has three available scanning speeds: fast, medium, and slow.

[0052] The specific operation process of the inductance test unit 120 is as follows: Open the digital bridge device 122, select the test item inductance L, and set the frequency, voltage, internal resistance, scan speed, and equivalent resistance. For example, set the frequency to 1 kHz, voltage to 1.0 V, internal resistance to 100 Ω, scan speed to slow, and equivalent resistance to parallel. Connect the terminal blocks to the digital bridge device 122, leave nothing connected at both ends of the terminal blocks, select "Open Circuit" on the digital bridge device 122 panel, and when you hear a beep, the open circuit is complete. Clamp the two ends of the terminal blocks together, select "Short Circuit" on the digital bridge device 122 panel, and when you hear a beep, the short circuit is complete. After calibration is complete, connect the two ends of the terminal blocks to the interfaces of the test coil 121. The air inductance L1 will now be displayed on the digital bridge device 122. The settings of the test coil 121 can be selected specifically, for example, a test coil 121 with a diameter of 0.8 mm and 30 turns. The cured absorbing material 200 passes through the inductance tester 120 and the thickness measurement unit 130 in sequence. The digital bridge device 122 displays the inductance L2 of the absorbing material 200 , and the thickness measurement unit 130 displays the thickness T of the absorbing material 200 , for example, 50 μm≦T≦100 μm.

[0053] Digital bridge device 122 and thickness measurement unit 130 are connected to magnetic permeability calculation device 140. Magnetic permeability calculation device 140 is installed with matching calculation software. Magnetic permeability calculation device 140 automatically reads the inductance L2 and thickness T of the absorbing material 200 at its current location. The real-time magnetic permeability of the absorbing material 200 is calculated as follows: magnetic permeability u = (inductance L2 - inductance L1) × thickness coefficient K / thickness T. The thickness coefficient K is related to the thickness T of the absorbing material 200. Absorbing materials 200 of different thicknesses T have different thickness coefficients K. Specific values ​​for thickness coefficient K are shown in Table 1:

[0054] Table 1

[0055]

[0056]

[0057] For example, when 50 μm≦thickness T≦100 μm, magnetic permeability u=(L2-L1)×K2 / T.

[0058] The thickness coefficient K is determined by measuring the inductance L2' of absorber material 200 samples of varying thickness using the digital bridge device 122. The thickness T' is measured using the thickness measurement unit 130. The magnetic permeability u' of the absorber material 200 and the inductance L1' of air in the bridge device 122 are then measured using an impedance analyzer. The thickness coefficient K' for absorber material 200 of varying thickness is calculated as: magnetic permeability u' × thickness T' / (inductance L2' - inductance L1'). Samples from different batches of each material thickness range were tested no less than 100 times. After processing the data for the thickness coefficient K', the values ​​in Table 1 above were obtained. Since absorber material rolls are generally within 400 μm in thickness, the thickness coefficient K is calculated only up to 400 μm.

[0059] The testing device 100 of the present invention uses a digital bridge device 122 instead of an impedance analyzer to detect the magnetic permeability of the absorbing material 200, significantly reducing the cost of testing the magnetic permeability of the absorbing material 200. Conventional permeability testing directly uses an impedance analyzer, which is expensive and easily damaged. In this application, however, an impedance analyzer is first used to determine the thickness coefficient K of the material at different thicknesses. Subsequently, the digital bridge device 122 and thickness measurement unit 130 are used to determine the inductance L2 and thickness T of the absorbing material 200, and the magnetic permeability u of the absorbing material 200 can be calculated. The testing device 100 of this application is 70% less expensive than an impedance analyzer, thereby reducing the testing cost of the absorbing material 200.

[0060] Embodiment 5:

[0061] Based on Example 3, see Figure 1-6 The testing device 100 further includes a marking portion 150 , which is disposed near the second rotating member 112 and connected to the magnetic permeability calculation device 140 .

[0062] An alarm device is provided on the marking portion 150, and the alarm device is in communication with the magnetic permeability calculation device 140. When the magnetic permeability calculated by the magnetic permeability calculation device 140 exceeds the upper and lower limits preset by the system, the magnetic permeability calculation device 140 transmits an alarm signal to the alarm device. After receiving the alarm signal, the alarm device issues an alarm. At the same time, the marking portion 150 marks the position of the absorbing material 200 with unqualified magnetic permeability.

[0063] The marking portion 150 is positioned between the inductance testing portion 120 or the thickness measuring portion 130 and the second rotating member 112. The distance between the marking portion 150 and the inductance testing portion 120 or the thickness measuring portion 130 is 10-200 cm. Because it takes a certain amount of time from when the magnetic permeability calculation device 140 detects an abnormality to when the marking portion 150 marks the abnormality, and the absorbing material 200 continues to move during this reaction time, a certain reaction distance is required between the marking portion 150 and the inductance testing portion 120 or the thickness measuring portion 130.

[0064] Example 6:

[0065] Based on Example 5, see Figure 1-6 , a printing device 151 is provided in the marking unit 150.

[0066] The printing device 151 can print out labels and attach the labels to the corresponding locations of the absorbing materials 200 .

[0067] When the magnetic permeability calculation device 140 calculates an abnormal magnetic permeability, the alarm device sounds an alarm, and the printing device 151 prints the real-time magnetic permeability and affixes it to the corresponding location. There is a reaction time between the issuance of the alarm and the printing and affixing of the label by the printing device 151. If the response distance is too short, the printing device 151 may not respond in time. If the response distance is too long, the size of the testing device 100 will be too large. Considering the speed of printing and affixing the label by the printing device 151, the distance between the printing device 151 and the inductance testing unit 120 or the thickness measurement unit 130 is preferably 30-50 cm.

[0068] After the test is completed, by observing the end face of the roll of absorbing material 200, it is possible to clearly understand whether the magnetic permeability of the roll of material is abnormal. Products without abnormalities can be shipped without worry. Products with abnormalities need to be cut into Φ7x3mm rings and re-tested using an impedance analyzer for confirmation. Products with abnormal magnetic permeability will be handled according to quality management regulations.

[0069] In a specific embodiment, the printing device 151 is located on the upper surface of the absorbing material 200 .

[0070] In a specific embodiment, the thickness measuring unit 130 is disposed between the printing device 151 and the inductance testing unit 120 , and the distance between the printing device 151 and the thickness measuring unit 130 is 40 cm.

[0071] Embodiment seven:

[0072] Based on Example 1, see Figure 1-6The inductance testing unit 120 further includes: a first skeleton 123, which is arranged on the outside of the test coil 121; and a second skeleton 124, which is arranged on the inside of the test coil 121; wherein the test coil 121 is arranged between the first skeleton 123 and the second skeleton 124, and the test coil 121 is wound on the second skeleton 124.

[0073] The inductance test section 120 has a square-shaped structure, with the first frame 123 located at the outermost side of the inductance test section 120 and the second frame 124 located at the inner circle of the square. The second frame 124 secures the shape of the opening 127. The first and second frames 123, 124 are used to protect the test coil 121. The first and second frames 123, 124 are made of nylon material and can support the shape of the test coil 121. Holes are punched in the first and second frames 123, 124 and are connected by bolts. The test coil 121 is wound around the second frame 124, which forms the shape of the test coil 121. The test coil 121 is enameled wire.

[0074] Embodiment 8:

[0075] Based on Example 7, see Figure 1-6 A first coil hole 125 and a second coil hole 126 are provided on the first skeleton 123 , and the test coil 121 passes through the first coil hole 125 and the second coil hole 126 respectively.

[0076] The first frame 123 is an outer protective layer, on which a first coil hole 125 and a second coil hole 126 are provided. The first coil hole 125 and the second coil hole 126 can accommodate the test coil 121 to pass through.

[0077] Inductance measuring fixtures are provided on the first coil hole 125 and the second coil hole 126 . The test coils 121 passing through the first coil hole 125 and the second coil hole 126 are connected to the inductance measuring fixtures. The inductance measuring fixtures facilitate the connection of other devices to the test coils 121 .

[0078] Embodiment 9:

[0079] Based on Example 7, see Figure 1-6 An epoxy resin layer is provided between the first skeleton 123 and the test coil 121 ; and / or an epoxy resin layer is provided between the second skeleton 124 and the test coil 121 .

[0080] The test coil 121 is formed by winding enameled wire, and its shape itself is not fixed. Therefore, an epoxy resin layer is set between the first skeleton 123 and the test coil 121 or between the second skeleton 124 and the test coil 121. The epoxy resin layer can fix the shape of the test coil 121 and strengthen the connection between the test coil 121 and the first skeleton 123 and the second skeleton 124 to prevent the test coil 121 from sliding on the skeleton.

[0081] Embodiment 10:

[0082] Based on Example 1, see Figure 1-6 The rotating part 110 further includes a power device 113 , which is connected to the first rotating member 111 and the second rotating member 112 respectively.

[0083] The first rotating member 111 and the second rotating member 112 need to drive the absorbing material 200 to move in a certain direction. The power shaft of the motion device 113 is connected to the first rotating member 111 and the second rotating member 112, respectively. The power device 113 provides power for the rotation of the first rotating member 111 and the second rotating member 112. The power device 113 can also control the rotation speed of the first rotating member 111 and the second rotating member 112, respectively, so that the absorbing material 200 can pass through the inductance testing section 120 and the thickness measurement section 130 at a set speed.

[0084] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope defined by the claims.

Claims

1. A device for testing the magnetic permeability of an absorbing material, characterized in that: The testing device (100) comprises: A rotating portion (110), the rotating portion (110) comprising a first rotating member (111) and a second rotating member (112), wherein the first rotating member (111) and the second rotating member (112) rotate in coordination with each other and drive the absorbing material (200) to move; an inductance testing portion (120), wherein the inductance testing portion (120) is provided with a through opening (127) for accommodating the absorbing material (200) to pass through, and a testing coil (121) is provided on the through opening (127); a thickness measuring section (130), the thickness measuring section (130) comprising a first thickness measuring piece (131) and a second thickness measuring piece (132), the first thickness measuring piece (131) and the second thickness measuring piece (132) being arranged opposite to each other, and a test area (133) for the absorbing material (200) to pass through being provided between the first thickness measuring piece (131) and the second thickness measuring piece (132); Wherein, the inductance testing part (120) and the thickness measuring part (130) are arranged between the first rotating part (111) and the second rotating part (112); The first rotating member (111) and the second rotating member (112) are respectively fixedly connected to the wave absorbing material (200).

2. The testing device according to claim 1, wherein: The thickness measuring portion (130) is located between the inductance testing portion (120) and the second rotating member (112).

3. The testing device according to claim 1, wherein: The testing device (100) further comprises: A magnetic permeability calculation device (140) is provided. The inductance testing unit (120) and the thickness measuring unit (130) are respectively connected to the magnetic permeability calculation device (140).

4. The testing device according to claim 3, characterized in that: The inductance testing unit (120) further includes: A digital bridge device (122) is connected to the test coil (121) and the magnetic permeability calculation device (140) respectively.

5. The testing device according to claim 3, characterized in that: The testing device (100) further comprises: A marking portion (150) is provided at a position close to the second rotating member (112), and the marking portion (150) is connected to the magnetic permeability calculation device (140).

6. The testing device according to claim 5, characterized in that: The marking portion (150) is provided with a printing device (151).

7. The testing device according to claim 1, characterized in that The inductance testing unit (120) further includes: a first frame (123), the first frame (123) being arranged outside the test coil (121); a second frame (124), the second frame (124) being arranged on the inner side of the test coil (121); The test coil (121) is arranged between the first frame (123) and the second frame (124), and the test coil (121) is wound around the second frame (124).

8. The testing device according to claim 7, characterized in that: A first coil hole (125) and a second coil hole (126) are provided on the first frame (123), and the test coil (121) passes through the first coil hole (125) and the second coil hole (126) respectively.

9. The testing device according to claim 7, characterized in that: An epoxy resin layer is provided between the first skeleton (123) and the test coil (121); and / or An epoxy resin layer is provided between the second skeleton (124) and the test coil (121).

10. The testing device according to claim 1, wherein: The rotating part (110) further includes: A power device (113) is connected to the first rotating member (111) and the second rotating member (112) respectively.

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