Roller surface inspection apparatus and roller surface inspection method

Abstract

The present invention relates to a roller surface inspection apparatus and a roller surface inspection method. The roller surface inspection apparatus according to the present invention: inspects the surface state of a roller coming into contact with a material sheet, the outer peripheral surface of the roller including a contact surface coming into contact with the material sheet in the longitudinal direction of the roller, and a non-contact surface not coming into contact with the material sheet; and includes measurement sensors for measuring the gaps to the contact surface and the non-contact surface.

Description

Roller surface inspection device and roller surface inspection method

[0001] Cross-citation with related applications

[0002] This application claims the benefit of priority from Korean Patent Application No. 10-2024-0046671, filed April 5, 2024, the entire contents of which are incorporated herein by reference.

[0003] Technology field

[0004] The present invention relates to a roller surface inspection device and a roller surface inspection method.

[0005] Secondary batteries have been applied to small fields such as mobile devices and laptop computers, but recently, their research direction has expanded to medium and large fields, and they are widely used in fields requiring high voltage and large capacity, such as energy storage systems (ESS) and electric vehicles (EV).

[0006] Such secondary batteries can be manufactured in the form of an electrode assembly formed by cross-stacking electrodes and separators, housed in a case or housing. In this case, the electrodes may have the form of electrode sheets coated with electrode active materials, etc., cut to a predetermined size or shape.

[0007] These electrode sheets, for example, go through at least one rolling process. Generally, the rolling of the electrode sheets is performed by rolling rollers. At this time, the gap between the rolling rollers can be used as basic data for controlling the operation of the rolling rollers. The gap can mean the narrowest gap (or space) formed between a pair of rolling rollers. If the gap is excessively large, the electrode sheet may not be rolled sufficiently. This can cause various problems, such as the electrode sheet being rolled not being manufactured uniformly or having defects. Here, the surface of the rolling roller that comes into contact with the electrode sheet wears out as it is used. If the diameter is reduced due to wear or a portion is damaged and a groove is formed, a problem occurs in which some or all of the contact portions of the electrode sheet passing between multiple rolling rollers are not rolled.

[0008] Previously, it was not possible to standardize the replacement period by visually checking the surface condition of the roller in contact with the electrode sheet.

[0009] In other words, if the roller was severely worn with the naked eye, the roller had to be replaced if the roughness value of the roller deviated from the initial roughness value or if there was a change in dimension.

[0010] Therefore, a technology is needed to check the surface wear of the rollers before operating the equipment and determine when to replace them.

[0011] One aspect of the present invention is to provide a roller surface inspection device and roller surface inspection method that can easily inspect the wear condition of a roller in contact with a material sheet.

[0012] A roller surface inspection device according to an embodiment of the present invention is a roller surface inspection device that inspects the surface condition of a roller that comes into contact with a material sheet, wherein the outer peripheral surface of the roller includes a contact surface that comes into contact with the material sheet along the longitudinal direction of the roller and a non-contact surface that does not come into contact with the material sheet, and includes a measuring sensor that measures a gap between the contact surface and the non-contact surface.

[0013] Meanwhile, a roller surface inspection method according to an embodiment of the present invention is a roller surface inspection method for inspecting the surface condition of a roller that comes into contact with a material sheet, wherein the outer peripheral surface of the roller includes a contact surface that comes into contact with the material sheet along the longitudinal direction of the roller and a non-contact surface that does not come into contact with the material sheet, and includes a measuring step of measuring a gap between the contact surface and the non-contact surface using a measuring sensor.

[0014] According to the present invention, by measuring the gap between the contact surface and the non-contact surface that come into contact with the material sheet of the roller and the measuring sensor through the measuring sensor (110), it is easy to inspect the wear condition of the roller, standardize the timing of checking the condition of the roller and the timing of replacement, and make it easy to determine the timing of checking the condition of the roller and the timing of replacement.

[0015] Fig. 1 is a front view showing a roller surface inspection device according to an embodiment of the present invention.

[0016] Fig. 2 is a front view exemplarily showing a roller applied to a roller surface inspection device according to an embodiment of the present invention.

[0017] Fig. 3 is a schematic diagram showing a roller surface inspection device according to an embodiment of the present invention.

[0018] The objects, specific advantages, and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments taken in conjunction with the accompanying drawings. In this specification, when reference numerals are given to components in each drawing, it should be noted that, as far as possible, identical components are given the same reference numerals even if they are shown in different drawings. Furthermore, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. Furthermore, in describing the present invention, detailed descriptions of related known technologies that may unnecessarily obscure the gist of the present invention will be omitted.

[0019]

[0020] Roller surface inspection device according to an embodiment of the present invention

[0021]

[0022] FIG. 1 is a front view showing a roller surface inspection device according to an embodiment of the present invention, FIG. 2 is a front view showing an example of a roller applied to the roller surface inspection device according to an embodiment of the present invention, and FIG. 3 is a configuration diagram showing a roller surface inspection device according to an embodiment of the present invention.

[0023] Referring to FIGS. 1 to 3, a roller surface inspection device (100) according to an embodiment of the present invention is a roller surface inspection device (100) that inspects the surface condition of a roller (10) that comes into contact with a material sheet (20), wherein an outer peripheral surface (11) of the roller (10) includes a contact surface (11a) that comes into contact with the material sheet (20) along the longitudinal direction (L) of the roller (10) and a non-contact surface (11b) that does not come into contact with the material sheet (20), and includes a measuring sensor (110) that measures a gap between the contact surface (11a) and the non-contact surface (11b). In addition, the roller surface inspection device (100) according to an embodiment of the present invention may further include a determination unit (130) and an amplifier unit (120).

[0024]

[0025] In more detail, the roller surface inspection device (100) according to an embodiment of the present invention is a roller surface inspection device (100) that inspects the surface condition of a roller (10) that comes into contact with a material sheet (20).

[0026] The material sheet (20) can be composed of a sheet-shaped electrode.

[0027] The roller (10) may be extended in the longitudinal direction (L) in a cylindrical shape. Here, the outer circumferential surface (11) of the roller (10) may be made of a metal material. At this time, the roller (10) may be configured as a calendar roll. In addition, the roller (10) may have a rotational axis (12) extended in the direction of the central axis, so that the rotational axis (12) rotates and the roller (10) rotates.

[0028] In addition, the outer surface (11) of the roller (10) includes a contact surface (11a) that comes into contact with the material sheet (20) along the longitudinal direction (L) of the roller (10) and a non-contact surface (11b) that does not come into contact with the material sheet (20).

[0029] Here, the contact surface (11a) is located on both sides of the roller (10) with respect to the longitudinal direction (L) of the roller (10), and the non-contact surface (11b) can be located between a plurality of contact surfaces (11a) located on both sides of the roller (10).

[0030]

[0031] The measuring sensor (110) can measure the gap between the contact surface (11a) and the non-contact surface (11b) on the outer surface (11) of the roller (10), respectively. Here, the measuring sensor (110) can detect the wear status of the contact surface (11a) and the non-contact surface (11b) by measuring the gap (d1, d2, d3) between the measuring sensor (110) and the outer surface (11) of the roller (10). The position of the measuring sensor (110) can be adjusted and fixed by a fixing means. Here, the fixing means can include, for example, a fixing frame.

[0032] In addition, the measuring sensor (110) may be formed of a capacitance sensor. At this time, the measuring sensor (110) may transmit a capacitance signal, which is a measurement value of the contact surface (11a) and non-contact surface (11b) of the roller (10) being measured, to the determination unit (130).

[0033] The capacitive sensor may be, for example, a capacitive displacement sensor. The capacitive sensor can detect a change in capacitance and measure the gap (d1, d2, d3) between the measuring sensor (110), which is a capacitive sensor, and the outer surface (11) of the roller (10).

[0034] The capacitance sensor may include a non-contact surface sensor (111) that measures the capacitance of a non-contact surface (11b) and a contact surface sensor (112) that measures the capacitance of a contact surface (11a).

[0035] A plurality of non-contact surface sensors (111) are provided, and can sense the non-contact surfaces (11b) located on both sides of the roller (10).

[0036] A plurality of contact surface sensors (112) are provided along the longitudinal direction (L) of the roller (10), so that the diameter of the roller (10) of a plurality of parts can be measured at the contact surface (11a).

[0037] In addition, the contact surface sensor (112) may include a first contact surface sensor (112a) that measures the electrostatic capacity of the edge portion of the contact surface (11a) with which the material sheet (20) comes into contact with respect to the longitudinal direction (L) of the roller (10), and a second contact surface sensor (112b) that measures the electrostatic capacity of the central portion of the contact surface (11a) with which the material sheet (20) comes into contact with respect to the longitudinal direction (L) of the roller (10).

[0038] The first contact surface sensor (112a) is provided in multiple numbers and can sense the edges on both sides of the contact surface (11a). In addition, the second contact surface sensor (112b) can be positioned between the multiple first contact surface sensors (112a).

[0039] The non-contact surface sensor (111) and the contact surface sensor (112) can transmit the initial gap value measured between the non-contact surface sensor (111) and the contact surface sensor (112) and the outer surface (11) of the roller (10) to the determination unit (130) before the equipment including the roller (10) is operated. That is, the initial gap value of the non-contact surface (11b) measured by the non-contact surface sensor (111) and the initial gap value of the contact surface (11a) measured by the contact surface sensor (112) can be transmitted to the determination unit (130).

[0040] In addition, the non-contact surface sensor (111) and the contact surface sensor (112) can measure the gap (d1, d2, d3) between the non-contact surface sensor (111) and the contact surface sensor (112) and the outer surface (11) of the roller (10) after the equipment including the roller (10) is operated, and transmit the measured gap value to the determination unit (130). Here, the non-contact surface sensor (111) and the contact surface sensor (112) can measure the gap (d1, d2, d3) between the non-contact surface sensor (111) and the contact surface sensor (112) and the outer surface (11) of the roller (10) by rotating the roller (10) when measuring after the equipment is operated.

[0041] At this time, for example, the measured gap value measured while rotating the roller (10) in the determination unit (130) can be determined using the average value. That is, the average value of the gap values ​​transmitted from the measurement sensor (110) can be used as the measured gap value. Accordingly, it may be possible for the determination unit (130) to detect a change in the diameter of the contact surface (11a) and the non-contact surface (11b) of the roller (10). That is, it can be easily determined whether the contact surface (11a) and the non-contact surface (11b) of the roller (10) have worn out and the diameter has decreased.

[0042] Meanwhile, as another example, the measurement gap value measured by rotating the roller (10) in the determination unit (130) can be determined using a value exceeding a predetermined range. That is, a value exceeding a decimal point range in the gap value transmitted from the measurement sensor (110) can be used as the measurement gap value. Accordingly, the determination unit (130) can easily detect that some parts of the contact surface (11a) and non-contact surface (11b) of the roller (10) are damaged and grooves, etc. are formed.

[0043]

[0044] The determination unit (130) can receive the measurement values ​​of the contact surface (11a) and non-contact surface (11b) of the roller (10) measured through the measurement sensor (110) and determine whether the roller (10) is in need of condition check and replacement.

[0045] In addition, the determination unit (130) can determine that the condition of the roller (10) needs to be checked if the difference between the measurement value of the contact surface (11a) and the measurement value of the non-contact surface (11b) is greater than a certain value. At this time, the determination unit (130) can determine that the condition of the roller (10) needs to be checked if, for example, the difference between the measurement value of the contact surface (11a) and the measurement value of the non-contact surface (11b) is greater than 2%.

[0046] Here, the determination unit (130) can determine that the status of the roller (10) needs to be checked, for example, when the amplitude difference of the electrostatic capacitance signal waveform of the contact surface (11a) with respect to the electrostatic capacitance signal waveform of the non-contact surface (11b) is greater than a certain value. At this time, the determination unit (130) can determine that the status of the roller (10) needs to be checked, for example, when the amplitude difference of the electrostatic capacitance signal waveform of the contact surface (11a) with respect to the electrostatic capacitance signal waveform of the non-contact surface (11b) is greater than 2%.

[0047] In addition, the determination unit (130) can compare the initial gap value measured before the equipment operation by the non-contact surface sensor (111) and the contact surface sensor (112) with the measured gap value measured after the equipment operation, and determine that the roller (10) needs to be replaced if the difference is greater than a certain range. At this time, the determination unit (130) can compare the initial gap value measured before the equipment operation by the non-contact surface sensor (111) and the contact surface sensor (112), and determine that the roller (10) needs to be replaced if the difference is greater than a 3% range.

[0048]

[0049] The amplifier (120) can be connected to the measurement sensor (110) to amplify the measurement values ​​of the contact surface (11a) and the non-contact surface (11b) and transmit them to the determination unit (130). At this time, the amplifier (120) can be connected to the measurement sensor (110), for example, to amplify the electrostatic capacitance signal of the contact surface (11a) and the electrostatic capacitance signal of the non-contact surface (11b) and transmit them to the determination unit (130).

[0050] Accordingly, by amplifying the measurement values ​​of the contact surface (11a) and the non-contact surface (11b) through the amplification unit (120), the state of the roller (10) can be more accurately determined in the determination unit (130).

[0051]

[0052] The roller surface inspection device (100) according to the embodiment of the present invention, configured as described above, measures the gap between the contact surface (11a) that comes into contact with the material sheet (20) of the roller (10) and the non-contact surface (11b) that does not come into contact with the material sheet (20) and the measurement sensor (110), thereby facilitating inspection of the wear condition of the roller (10), standardizing the timing for checking the condition of the roller (10) and the timing for replacement, and facilitating judgment of the timing for checking the condition of the roller (10) and the timing for replacement.

[0053]

[0054] Roller surface inspection method according to an embodiment of the present invention

[0055]

[0056] Hereinafter, a roller surface inspection method according to an embodiment of the present invention will be described.

[0057] Referring to FIGS. 1 to 3, a roller surface inspection method according to an embodiment of the present invention is a roller surface inspection method for inspecting the surface state of a roller (10) that comes into contact with a material sheet (20), wherein an outer peripheral surface (11) of the roller (10) includes a contact surface (11a) that comes into contact with the material sheet (20) along the longitudinal direction (L) of the roller (10) and a non-contact surface (11b) that does not come into contact with the material sheet (20), and includes a measuring step of measuring a gap (Gap) between the contact surface (11a) and the non-contact surface (11b) through a measuring sensor (110). In addition, the roller surface inspection method according to an embodiment of the present invention may further include a determination step and an amplification step.

[0058] The roller surface inspection method according to an embodiment of the present invention relates to a roller surface inspection method applied to the roller surface inspection device (100) according to the embodiment described above. Therefore, in this embodiment, any content overlapping with the embodiment described above will be omitted or briefly described, and differences will be described.

[0059]

[0060] In more detail, the roller surface inspection method according to the embodiment of the present invention is a roller surface inspection method that inspects the surface condition of a roller (10) in contact with a material sheet (20).

[0061] The material sheet (20) can be composed of a sheet-shaped electrode.

[0062] The roller (10) may be extended in the longitudinal direction (L) in a cylindrical shape. Here, the outer peripheral surface (11) of the roller (10) may be made of a metal material. At this time, the roller (10) may be configured as a calendar roll.

[0063] In addition, the outer surface (11) of the roller (10) includes a contact surface (11a) that comes into contact with the material sheet (20) along the longitudinal direction (L) of the roller (10) and a non-contact surface (11b) that does not come into contact with the material sheet (20).

[0064] Here, the contact surface (11a) is located on both sides of the roller (10) with respect to the longitudinal direction (L) of the roller (10), and the non-contact surface (11b) can be located between a plurality of contact surfaces (11a) located on both sides of the roller (10).

[0065]

[0066] The measurement step can measure the gap between the contact surface (11a) and the non-contact surface (11b) on the outer surface (11) of the roller (10) using a measurement sensor (110).

[0067] And, the measurement step can detect the wear status of the contact surface (11a) and the non-contact surface (11b) by measuring the gap (d1, d2, d3) between the measuring sensor (110) and the outer surface (11) of the roller (10) measured through the measuring sensor (110).

[0068] In addition, the measuring step can transmit the measurement values ​​of the contact surface (11a) and the non-contact surface (11b) of the roller (10) measured by the measuring sensor (110) composed of the electrostatic capacitance sensor to the determination unit (130). Here, the measuring step can transmit the electrostatic capacitance signal, which is the measurement values ​​of the contact surface (11a) and the non-contact surface (11b) of the roller (10) measured by the measuring sensor (110), to the determination unit (130), for example.

[0069]

[0070] The capacitive sensor may include a non-contact surface sensor (111) that measures the capacitance of a non-contact surface (11b) and a contact surface sensor (112) that measures the capacitance of a contact surface (11a). For example, when an AC current of a constant frequency is passed toward a conductive measurement object, the amplitude of the AC voltage is proportional to the distance from the measurement object, and thus the distance between the capacitive sensor and the measurement object can be measured.

[0071] A plurality of non-contact surface sensors (111) are provided, and can sense the non-contact surfaces (11b) located on both sides of the roller (10).

[0072] In addition, the measurement step can measure the diameter of multiple portions of the roller (10) at the contact surface (11a) by positioning multiple contact surface sensors (112) along the longitudinal direction (L) of the roller (10).

[0073] The contact surface sensor (112) may include a first contact surface sensor (112a) that measures the electrostatic capacity of the edge portion of the contact surface (11a) with which the material sheet (20) comes into contact with respect to the longitudinal direction (L) of the roller (10), and a second contact surface sensor (112b) that measures the electrostatic capacity of the central portion of the contact surface (11a) with which the material sheet (20) comes into contact with respect to the longitudinal direction (L) of the roller (10).

[0074] The first contact surface sensor (112a) is provided in multiple numbers and can sense the edges on both sides of the contact surface (11a). In addition, the second contact surface sensor (112b) can be positioned between the multiple first contact surface sensors (112a).

[0075]

[0076] Meanwhile, the measurement step may include an initial setting process of measuring a gap (d1, d2, d3) between the ends (111a, 112a-1, 112b-1) of the non-contact surface sensor (111) and the contact surface sensor (112) and the outer surface (11) of the roller (10) before operation of the equipment including the roller (10), so as to position the ends (111a, 112a-1, 112b-1) of the non-contact surface sensor (111) and the contact surface sensor (112) so as to have a constant initial gap value with the outer surface (11) of the roller (10). At this time, the initial setting process may be set so that, for example, the ends (111a, 112a-1, 112b-1) of the non-contact surface sensor (111) and the contact surface sensor (112) have a gap value of about 600 um with the outer surface (11) of the roller (10).

[0077] In addition, the measurement step may further include a post-measurement process of measuring the gap (d1, d2, d3) between the non-contact surface sensor (111) and the contact surface sensor (112) and the outer surface (11) of the roller (10) after the equipment including the roller (10) is operated, and extracting the measurement gap value.

[0078] Here, the post-measurement process can measure the gap (d1, d2, d3) between the non-contact surface sensor (111) and the contact surface sensor (112) and the outer surface (11) of the roller (10) by rotating the roller (10) after the equipment is started.

[0079] At this time, for example, the measured gap value measured while rotating the roller (10) in the determination step can be determined using the average value. That is, the determination unit (130) can use the average value of the gap values ​​transmitted from the measurement sensor (110) as the measured gap value. Accordingly, it may be possible to detect a change in the diameter of the contact surface (11a) and the non-contact surface (11b) of the roller (10) in the determination step. That is, it is possible to easily determine whether the contact surface (11a) and the non-contact surface (11b) of the roller (10) have worn out and the diameter has decreased in the determination step.

[0080] Meanwhile, as another example, in the determination step, the measured gap value measured while rotating the roller (10) can be determined using a value exceeding a predetermined range. That is, in the determination step, a value exceeding a decimal point range among the gap values ​​transmitted from the measurement sensor (110) can be used as the measured gap value. Accordingly, in the determination step, it is possible to easily detect that some parts of the contact surface (11a) and non-contact surface (11b) of the roller (10) are damaged and grooves, etc. are formed.

[0081]

[0082] The judgment step receives the measurement values ​​of the contact surface (11a) and non-contact surface (11b) of the roller (10) measured through the measurement step, and can determine through the judgment unit (130) whether the roller (10) is in good condition and needs to be replaced.

[0083] In addition, the determination step can determine that it is necessary to check the condition of the roller (10) if the difference between the measurement value of the contact surface (11a) and the measurement value of the non-contact surface (11b) is greater than a certain value. At this time, the determination step can determine that it is necessary to check the condition of the roller (10) if, for example, the difference between the measurement value of the contact surface (11a) and the measurement value of the non-contact surface (11b) is greater than 2%.

[0084] Here, the judgment step can determine that it is necessary to check the status of the roller (10) when, for example, the difference in amplitude between the electrostatic capacitance signal waveform of the contact surface (11a) and the electrostatic capacitance signal waveform of the non-contact surface (11b) is greater than a certain value. At this time, the judgment step can determine that it is necessary to check the status of the roller (10) when, for example, the difference in amplitude between the electrostatic capacitance signal waveform of the contact surface (11a) and the electrostatic capacitance signal waveform of the non-contact surface (11b) is greater than 2%.

[0085] In addition, the determination step can compare the initial gap value measured before the equipment operation during the initial setting process with the measured gap value measured after the equipment operation during the post-measurement process, and if the difference in the gap value is greater than a certain range, it can be determined that the roller (10) needs to be replaced. At this time, the determination step can compare the initial gap value measured before the equipment operation with the measured gap value measured after the equipment operation, for example, by the non-contact surface sensor (111) and the contact surface sensor (112), and if the difference is greater than a 3% range, it can be determined that the roller (10) needs to be replaced.

[0086]

[0087] The amplification stage is connected to the measurement sensor (110) and can amplify the measurement values ​​of the contact surface (11a) and the non-contact surface (11b) through the amplification unit (120) and transmit them to the determination unit (130).

[0088] At this time, the amplification step can amplify, for example, the electrostatic capacitance signal of the contact surface (11a) and the electrostatic capacitance signal of the non-contact surface (11b) through the amplification unit (120) connected to the measurement sensor (110) and transmit them to the determination unit (130).

[0089] Accordingly, by amplifying the measurement values ​​of the contact surface (11a) and the non-contact surface (11b) through the amplification unit (120) in the amplification step, the state of the roller (10) can be more accurately determined in the determination step.

[0090]

[0091] While the present invention has been described in detail through specific examples, these are intended to illustrate the invention in detail and are not intended to be limiting. Those skilled in the art will appreciate that various implementations are possible within the technical scope of the present invention.

[0092] Additionally, the specific scope of protection of the invention will be made clear by the appended claims.

[0093]

[0094] [Explanation of symbols]

[0095] 10: Roller

[0096] 11: Outer circle

[0097] 11a: Contact surface

[0098] 11b: Non-contact surface

[0099] 12: Rotation axis

[0100] 20: Material Sheet

[0101] 100: Roller surface inspection device

[0102] 110: Measurement sensor

[0103] 111: Non-contact surface sensor

[0104] 111a,112a-1,112b-1: end

[0105] 112: Contact surface sensor

[0106] 112a: First contact surface sensor

[0107] 112b: Second contact surface sensor

[0108] 120: Amplifier

[0109] 130: Discrimination section

[0110] L: longitudinal

Claims

1. A roller surface inspection device that inspects the surface condition of a roller that comes into contact with a material sheet. The outer surface of the roller includes a contact surface that contacts the material sheet along the longitudinal direction of the roller and a non-contact surface that does not contact the material sheet, A roller surface inspection device including a measuring sensor that measures the gap between the contact surface and the non-contact surface.

2. In claim 1, The above measurement sensor is a roller surface inspection device that detects the wear status of the contact surface and the non-contact surface by measuring the gap between the contact surface and the non-contact surface and the measurement sensor.

3. In claim 1, A roller surface inspection device further comprising a determination unit that receives measurement values ​​of the contact surface and non-contact surface of the roller measured through the measurement sensor and determines whether the roller needs to be replaced or not.

4. In claim 3, The above judgment part A roller surface inspection device that determines that the condition of the roller needs to be checked when the difference between the measurement value of the contact surface and the measurement value of the non-contact surface is greater than a certain value.

5. In claim 3, The above measuring sensor is a roller surface inspection device composed of an electrostatic capacitance sensor.

6. In claim 5, A roller surface inspection device further comprising an amplifier unit connected to the above measurement sensor and amplifying the measurement values ​​of the contact surface and the non-contact surface and transmitting them to the determination unit.

7. In claim 5 or claim 6, The above measurement sensor measures the gap between the contact surface and the non-contact surface and the end of the measurement sensor when the roller rotates, The above determination unit is a roller surface inspection device that determines that the condition of the roller needs to be checked when the difference between the measurement value of the contact surface and the measurement value of the non-contact surface is greater than a certain value.

8. In claim 5, The above capacitance sensor A non-contact surface sensor that measures the electrostatic capacitance of the non-contact surface; and Includes a contact sensor that measures the electrostatic capacitance of the contact surface, A roller surface inspection device in which the above contact surface sensors are provided in a plurality along the longitudinal direction of the roller, and measure the diameter of the roller at a plurality of portions on the contact surface.

9. In claim 8, The above non-contact surface sensor and the above contact surface sensor Before operating the equipment including the roller, the initial gap value measured between the non-contact surface sensor and the contact surface sensor and the outer surface of the roller is transmitted to the determination unit, After the equipment including the roller is operated, the gap value measured between the non-contact surface sensor and the contact surface sensor and the outer surface of the roller is transmitted to the determination unit. The above determination unit is a roller surface inspection device that compares the initial gap value and the measured gap value and determines that the roller needs to be replaced if the difference exceeds a certain range.

10. In claim 8, The above contact surface sensor, A first contact surface sensor that measures the electrostatic capacitance of the edge portion of the contact surface with which the material sheet comes into contact with respect to the longitudinal direction of the roller; and A roller surface inspection device including a second contact surface sensor that measures the electrostatic capacitance of the central portion of the contact surface with which the material sheet comes into contact with respect to the longitudinal direction of the roller.

11. In claim 1, The outer surface of the above roller is made of metal, The above material sheet is a roller surface inspection device composed of a sheet-shaped electrode.

12. A roller surface inspection method for inspecting the surface condition of a roller in contact with a material sheet, The outer surface of the roller includes a contact surface that contacts the material sheet along the longitudinal direction of the roller and a non-contact surface that does not contact the material sheet, A roller surface inspection method including a measuring step of measuring a gap between the contact surface and the non-contact surface using a measuring sensor.

13. In claim 12, The above measurement steps are A roller surface inspection method for detecting the wear status of the contact surface and the non-contact surface by measuring the gap between the contact surface and the non-contact surface through the measuring sensor.

14. In claim 12, A roller surface inspection method further comprising a determination step of receiving measurement values ​​of the contact surface and non-contact surface of the roller measured through the above measurement step and determining through a determination unit that the roller needs to be replaced and checked in condition.

15. In claim 14, The above judgment step is A roller surface inspection method for determining that the condition of the roller needs to be checked when the difference between the measurement value of the contact surface and the measurement value of the non-contact surface is greater than a certain value.

16. In claim 14, The above measurement steps are A roller surface inspection method that transmits the measurement values ​​of the contact surface and non-contact surface of the roller measured by the measurement sensor composed of the electrostatic capacitance sensor to the determination unit.

17. In claim 16, A roller surface inspection method further comprising an amplification step of amplifying the measurement values ​​of the contact surface and the measurement values ​​of the non-contact surface through an amplification unit connected to the measurement sensor and transmitting the amplified values ​​to the determination unit.

18. In claim 16 or claim 17, The above measurement step measures the gap between the contact surface and the non-contact surface and the end of the measurement sensor when the roller rotates, The above determination step is a roller surface inspection method for determining that the condition of the roller needs to be checked when the difference between the measurement value of the contact surface and the measurement value of the non-contact surface is greater than a certain value.

19. In claim 16, The above capacitive sensor includes a non-contact surface sensor that measures the capacitance of the non-contact surface; and a contact surface sensor that measures the capacitance of the contact surface. The above measurement step is a roller surface inspection method in which a plurality of contact surface sensors are positioned along the longitudinal direction of the roller to measure the roller diameter of a plurality of portions on the contact surface.

20. In claim 19, The above measurement steps are A roller surface inspection method including an initial setting process of measuring a gap between the ends of the non-contact surface sensor and the contact surface sensor and the outer surface of the roller before operating the equipment including the roller, and positioning the ends of the non-contact surface sensor and the contact surface sensor so that they have a constant initial gap value with the outer surface of the roller.

21. In claim 20, The above measurement steps are: After the equipment including the roller is operated, a post-measurement process is further included to measure the gap between the non-contact surface sensor and the contact surface sensor and the outer surface of the roller, and to extract the measured gap value. The above determination step is a roller surface inspection method that compares the initial gap value and the measured gap value, and determines that the roller needs to be replaced if the difference in the gap value is greater than a certain range.

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