JP2008164377A - Wear gauge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wear gauge for accurately measuring the amount of wear of a slide part in stages. <P>SOLUTION: The wear gauge for detecting the wear of a slide member of an industrial machine can be fixed to the slide member, and is provided with one or more wear detecting lines arranged at intervals at a tip, and has a wear gauge body section made of an insulating board, where the one or more wear detecting lines wear in stages with the wear of the slide member. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a gauge for measuring wear of a sliding portion of an industrial facility, and more particularly to a wear gauge capable of predicting a maintenance time by detecting a wear state in stages.

  In order to diagnose the wear state, the sliding part of the industrial machine is inspected by actually disassembling the machine and measuring the wear state of the sliding part.

  However, there is a drawback that much time and cost are required for inspection, and it is desired to develop a method for detecting the actual wear amount of the sliding portion even when the machine is in operation.

  As a method for detecting the amount of wear of the sliding portion even when the machine is in operation, the operation of a gear shaper equipped with a thrust spindle that houses a cutting gear and is guided by a guide portion of the machine housing Sometimes the radial force acting on the cutting gear is detected by at least one sensor (strain gauge) arranged in the region of the guide, the sensor (strain gauge) being radial generated by wear during operation of the cutting gear There are techniques that detect force changes and use an increase in radial force that exceeds the general tolerances for machines, for example, as a signal that affects the operation of a gear shaper to stop the machine (e.g., Patent Document 1).

The present inventors also provide a wear sensor for detecting wear on a sliding surface of a structural member of an industrial machine as a method for detecting the wear amount of a sliding portion, and an insulator having steps different from each other. A tip portion including a plurality of step portions and conductive film portions formed on the surfaces of the plurality of step portions so that the tip surface of the tip portion and the sliding surface of the component member are on the same plane. In addition, a sensor having a main body portion that can be fixed to a component member and gradually wears from a step portion close to the sliding surface among a plurality of step portions as the component member is worn has been developed. 2).
Japanese Patent Laid-Open No. 2001-150244 JP 2006-64487 A

  However, according to the method described in Patent Document 1, although a strain gauge is used for detecting the wear amount, the sensor itself is inexpensive, but it does not directly detect the wear amount of the sliding member, but occurs in the member. Since it is a method of indirectly detecting from stress, there is a possibility that noise is included in the measurement result due to disturbance or the like, and the reliability of wear amount detection is poor.

  Further, according to the sensor developed by the present inventors, since the amount of wear of the sliding member is directly detected, it is possible to detect the amount of wear with high reliability, but it is cheaper and simpler like a strain gauge. There is a need for a simple wear detection technique.

  The present invention has been made to solve such a conventional problem, and aims to provide a less expensive wear gauge capable of measuring the amount of wear of sliding parts of industrial equipment stepwise and accurately. To do.

  The invention according to claim 1 is a wear gauge for detecting wear of a sliding member of an industrial machine, and is one or more wears that can be fixed to the sliding member and are arranged at intervals at the tip. It is characterized by comprising a wear gauge main body comprising an insulating plate, which is provided with a detection line and in which one or more wear detection lines wear out in stages as the sliding member wears.

  According to the wear gauge of the present invention, even when the machine is in operation, the actual wear state of the sliding portion can be constantly monitored, and parts can be inspected and replaced at an appropriate time.

  By detecting the disconnection of the circuit corresponding to the wear amount of the sliding member, the actual wear amount of the sliding portion can be detected in a stepwise manner, and the change tendency of the wear amount can be grasped.

  Further, since the detection method is a simple method using only electrical resistance, it is resistant to disturbance and easy to determine wear. Since the wear gauge has a simple structure, it can be manufactured at a low cost.

(First embodiment)
Hereinafter, the wear gauge which is 1st Embodiment of this invention is demonstrated in detail with reference to figures.

  FIG. 1 is a view showing an appearance of a wear gauge according to a first embodiment of the present invention. FIG. 1A is a side view of a main body part and a circuit part of the wear gauge of this embodiment, and FIG. 1B is a front view of the main body part and the circuit part of the wear gauge of this embodiment.

  The wear gauge main body 100 is made of a printed circuit board. The printed board is appropriately selected from a rigid board or a flexible board according to a sliding member (hereinafter also referred to as a target) to be measured.

  When a rigid substrate is used for the wear gauge main body 100, the wear gauge itself has a certain rigidity, so that the wear gauge can be fixed to the target without providing a special holding member.

  When a film-like flexible substrate is used for the wear gauge main body 100, the wear gauge itself can be deformed, so that the wear gauge can be attached to the target regardless of the shape of the non-measurement member. Become. Further, since it is in the form of a film, the wear powder generated from the wear gauge is minute and can be made of a material softer than the target, so that the influence on the wear of the target and the counterpart material is extremely small.

  As rigid substrates, general substrates include bakelite substrates, phenol substrates, epoxy substrates (paper epoxy, glass epoxy, etc.), glass composite substrates, glass cloth substrates, ceramic substrates (alumina, etc.), and metal substrates (iron, copper, etc.) , Aluminum, stainless steel, etc.) can be used.

  In addition, as a rigid substrate material, as a special resin substrate material, polyimide resin, aramid resin, fluorine resin, PPE (polyphenylene ether) resin, PPO (polyphenol oxide) resin, BT (bismaleimide triazine) resin, etc. It is possible to use.

  Other rigid substrate materials that have been developed in recent years include cyanate resin, maleimide resin, polyolefin, liquid crystalline polyester, polyethylene naphthalate, acrylic resin, PVB laminate, PEEK, polyquinoline, norbornene. Polyparabanic acid, bisallyl nazide, and the like can be used.

  As the flexible substrate material, polyimide film, aramid film, glass cloth, epoxy resin and the like can be used.

  As shown in FIG. 1B, the wear gauge main body 100 of the present embodiment is provided with print lines 1-5. The wear detection print lines 1a to 5a, which are wear detection positions in the print lines 1 to 5, are arranged at intervals at the tip of the wear gauge main body 100.

  Each of the wear detection print lines 1 a is disposed so as to be exposed on the front end surface 100 a of the wear gauge main body 100. The wear detection print line 2a is formed at a position L1 from the front end surface 100a of the wear gauge main body 100. Similarly, each of the wear detection print lines 3a to 5a is formed at positions L2 to L4 from the front end surface 100a of the wear gauge main body 100, respectively.

  Via holes 1b to 5b are provided at the lower ends of the print lines 1 to 5 below the wear gauge main body 100, and terminals 1c to 5c serving as connection portions with the external measuring device shown in FIG. For each of the print lines 1 to 5, the common terminal 6c shown in FIG. 3 connected to the common print line 6 and disposed in the via hole 6b serves as a common connection portion with the external measuring apparatus. These print lines 1 to 5 constitute a wear gauge circuit portion as a whole. In addition, about the terminals 1c-6c, a connection with an external measuring device is implement | achieved by a connector, soldering is unnecessary at the time of attachment of a wear gauge, and attachment / detachment of an external measuring device is made easy.

  The wear gauge main body 100 of the present embodiment can be manufactured using a general printed circuit board manufacturing technique.

  A wear hole 100b for fixing the wear gauge is provided at a substantially central position of the wear gauge main body 100. The fixing hole 100b is formed with a predetermined dimensional accuracy by a reamer or the like. By fixing the fixing hole 100b to the target via a knock pin or the like, the wear gauge can be fixed to the target without any trouble even when the machine is in operation. This makes it possible to detect a stable wear amount.

  In the present embodiment, the number of wear detection print lines is five. However, the present invention is not limited to this, and the number of wear detection print lines can be arbitrarily set. Similarly, the intervals between the wear detection print lines 1a to 5a can be arbitrarily set. In the present embodiment, each of the wear detection print lines 1a to 5a is linear, but may be an arbitrary curve or shape in accordance with the shape of the constituent member for measuring wear. For example, FIG. 2A shows an omnidirectional wear gauge by making the shape of the print line for wear detection into an arc shape. FIG. 2B shows a wear gauge that can detect wear in a minute range by narrowing the length of the print line for wear detection.

  FIG. 3 is a block diagram showing the connection between the wear gauge main body 100 and the measurement unit 101. As shown in the figure, the print line 1 is connected to the connection unit 101-1 of the measurement unit 101 via the terminal 1c, and connected to the common print line 6 connected to the connection unit 101-6. One circuit is formed. Similarly, the print lines 2 to 5 are connected to the connection units 101-2 to 101-5 of the measurement unit 101 through the terminals 2c to 5c, respectively, and the common print line 6 connected to the connection unit 101-6. Each circuit is formed by connection.

  The measuring unit 101 measures the resistance values of the print lines 1 to 5, and detects the wear of each wear detection print line 1 a that is the first-stage line by insulating the print line 1. Similarly, the insulation of the print lines 2 to 5 detects the wear of the wear detection print lines 2a to 5a, which are the second to fifth stages.

  FIG. 4 is a diagram illustrating an example of attachment of the wear gauge to the industrial machine of the present embodiment, and the wear gauge made of the flexible substrate of the present embodiment is attached to a sliding member in the industrial machine to be subjected to wear detection. FIG.

  In the wear gauge 100 of the present embodiment, the support block 102 is formed by molding it into a predetermined shape by surrounding it with the same kind of material as that of the sliding member to be subjected to wear detection. The wear gauge 100 made of a flexible substrate is a film and is difficult to wear alone. However, by forming the support block 102 and embedding in the slide member, the wear gauge 100 can be worn with the slide member. It becomes. At the time of forming the support block 102, polishing is performed so that the tip surface 100a of the wear gauge 100 and each wear detection print line 1a are exposed.

  In the present embodiment, the example in which the support block 102 is formed has been described. However, the present invention is not limited to this. In the case of a wear gauge made of a rigid substrate, the wear gauge 100 main body is directly bonded to the sliding member. Also good. In the case of a wear gauge made of a rigid substrate, it may be fixed with a knock pin or reamer bolt using the fixing hole 100b.

  The wear gauge 100 is inserted into a through hole 100b opened in the side surface of the sliding member 40, and the tip surface 100a of the wear gauge 100 is attached so as to be substantially flush with the sliding surface 40a of the sliding member 40. It is fixed with an adhesive or the like.

  When the operation of the industrial machine is actually started, the wear of the inner surface portion 40a of the sliding member 40 progresses due to the sliding of the predetermined member 30 and the sliding member 40. The tip surface 100a and the print line 1a for wear detection which are exposed to be used as a reference for the wear depth located near the surface are also worn. Due to wear of the print line 1a for wear detection, the electrical connection of the print line 1 is cut, and the resistance value of the print line 1 becomes infinite. The wear detection print line 1a serving as a reference is first worn out, and can be used as a reference for the subsequent wear amount.

  As the sliding member 40 wears, the wear gauge 100 further wears, and when the wear progresses L1, each wear detection print line 2a disappears due to wear, and the electrical connection of the print line 2 is cut off. Become. As a result, the resistance value of the print line 2 becomes infinite. That is, by detecting that the resistance value of the print line 2 has become infinite, it is possible to detect that the wear has progressed L1.

  Thereafter, as the wear of the wear gauge 100 progresses, the wear detection print lines 3a to 5a wear, and the continuity of the print lines 3 to 5 is lost in sequence, so that it is possible to detect that the wear has progressed L2 to L4.

  Since the wear amounts L1 to L4 of the wear gauge 100 are the same as the wear amounts of the sliding surface 40a of the sliding member 40, the wear amount of the sliding member 40 is detected by detecting the wear of the wear gauge 100 step by step. The amount of wear can be detected in stages.

  In general, since it is easy to detect a state where the circuit is disconnected, that is, a state where the resistance value is infinite, reliable wear can be detected.

  As described above, according to the wear gauge of the present embodiment, the wear amount of the sliding member can be detected stepwise by detecting circuit disconnection when the wear detection print line is worn. . Since the detection method is a simple method using only electrical resistance, it is resistant to disturbance and easy to determine wear. Further, since the actual amount of wear is measured, accurate measurement without error is possible.

  Since the change in the amount of wear can be grasped step by step, the tendency of the change in the amount of wear can be grasped, and the remaining life of the mechanical system and the optimal maintenance time can be predicted.

  Since the wear gauge 100 of the present embodiment can be manufactured using a general printed circuit board manufacturing technique, it can be mass-produced with high quality, high accuracy, and low price.

  In addition, since the wear gauge main body 100 can be formed into a film, the wear powder generated from the gauge main body is very small, and the influence on the wear of the sliding member and the counterpart member is extremely small.

  And since the circuit layout, which is an electrical configuration, is made integrally on the printed circuit board, there is no risk of measurement errors due to movement of the electrodes due to vibration, etc., and the measurement pitch can be set arbitrarily and accurately. Is possible.

(Second Embodiment)
Next, the wear gauge which is 2nd Embodiment of this invention is demonstrated in detail with reference to figures. The wear gauge according to the present embodiment is configured by configuring the wear gauge main body according to the first embodiment of the present invention with a plurality of substrates. The arrangement of the print lines 1 to 6, the connection to the measurement unit, and the attachment method to the sliding member according to the present embodiment are the same as those of the wear gauge according to the first embodiment of the present invention. Is omitted.

  FIG. 5 is a view showing an appearance of a wear gauge according to the second embodiment of the present invention. FIG. 5A is a side view of the main body part and the circuit part of the wear gauge of this embodiment, and FIG. 5B is a front view of the main body part and the circuit part of the wear gauge of this embodiment.

  As shown in FIG. 5B, the wear gauge main body 200 of the present embodiment is provided with print lines 1-6. Via holes 1b to 6b are provided at the lower ends of the print lines 1 to 6 below the wear gauge main body 200, and electrical connection between circuit printed boards 201 and 202 and a support printed board 203 to be described later is achieved. Yes.

  As shown in FIG. 5A, the wear gauge main body 200 of this embodiment is formed by stacking circuit printed boards 201 and 202 and a printed board 203 for support.

  FIG. 6 is a diagram showing the arrangement of the print lines of the circuit printed boards 201 and 202 and the support printed board 203. 6A shows the non-printed surface 201a of the circuit printed board 201, FIG. 6B shows the printed surface 201b of the circuit printed board 201, and FIG. 6C shows the printed surface 202b of the circuit printed board 202. FIG. 6D shows the printed circuit board 203 for support.

  Print lines 1, 3, 5, and 6 are formed on the print surface 201 b of the circuit printed board 201, and print lines 2, 4, and 6 are formed on the print surface 202 b of the circuit print board 202. According to the wear gauge of the present embodiment, it is possible to change the detection signal for each layer by dividing the print line into a plurality of circuit printed boards, and to obtain a detection resolution impossible with one layer. Become.

  When a general printing technique is used, the pitch of the printed line on each circuit printed board is about 0.1 mm. However, by forming the printed line by shifting the arrangement on a plurality of printed circuit boards, 0.1 mm The print lines can be arranged with the following pitch, and a higher level of detection resolution can be obtained. For example, in FIG. 6B, the wear detection print lines 1a, 3a, and 5a are arranged at a pitch of 0.1 mm, and the wear detection print line 1a is arranged at the upper end of the circuit printed board 201, and FIG. When the wear detection print lines 2a and 4a are arranged at a pitch of 0.1 mm and the wear detection print line 2a is arranged at a position 0.05 mm from the upper end of the circuit print board 202, the circuit print board 201, The wear detection print lines 1a, 2a, 3a, 4a, and 5a of the wear gauge main body 200 when the 202 is laminated are arranged at a pitch of 0.05 mm, and it is possible to obtain a higher level of detection resolution. Become. This makes it possible to produce a high-resolution wear gauge at low cost without using advanced printing technology.

  Via holes 1b to 6b are formed in the lower part of the circuit printed boards 201 and 202 and the printed board 203 for support. It is possible to achieve electrical conduction between the circuit printed boards 201 and 202 and the support printed board 203.

  When the conductor is printed on the printed circuit board surface, even if the printed circuit board is worn out, the printed line itself is not worn and peeled off, and it may not be possible to detect the wear, but the printed surface on which the printed line is arranged, By being sandwiched between the inner surfaces of the circuit printed boards 201 and 202 and the support printed board 203, the printed line is surely broken and the wear can be reliably detected.

  As described above, according to the wear gauge of the present embodiment, in addition to the effects of the wear gauge of the first embodiment of the present invention, it is possible to manufacture a high-resolution wear gauge at low cost. As a result, the print line is surely broken and the wear can be reliably detected.

(Third embodiment)
Next, a wear gauge according to a third embodiment of the present invention will be described in detail with reference to the drawings. The wear gauge of the present embodiment is characterized in that the number of lead wires from the wear gauge 300 is reduced by integrating a plurality of circuits in the wear gauge main body 300.

  In addition, arrangement | positioning of the print lines 1-6 of this embodiment, the connection to a measurement part, and the attachment method to a sliding member are substantially the same as the wear gauge of 1st and 2nd embodiment of this invention. Therefore, only the differences will be described.

  FIG. 7 is a view showing an appearance of a wear gauge according to the third embodiment of the present invention. As shown in FIG. 7B, the wear gauge main body 300 of the present embodiment is provided with print lines 1-5. Resistors R2 to R5 having a resistance value r (Ω) are connected to predetermined positions in the print lines 2 to 5, respectively.

  One end of each of the print lines 1 to 5 of the wear gauge main body 300 is assembled and connected to the print line 1. The lower end portion of the print line 1 is provided with a via hole 1b, and a terminal 1c serving as a connection portion with the external measuring device shown in FIG. 9 is arranged. The other end of each print line 1 to 5 is connected to the common print line 6. At the end of the common print line 6, a via hole 6b is provided, and a common terminal 6c serving as a connection portion with the external measuring device shown in FIG. 9 is disposed.

  As shown in FIG. 7A, the wear gauge main body 300 of this embodiment is formed by laminating circuit printed boards 301 and 302 and a printed board 303 for support.

  FIG. 8 is a diagram showing the arrangement of the print lines of the circuit printed boards 301 and 302 and the support printed board 303. 8A shows the non-printed surface 301a of the circuit printed board 301, FIG. 8B shows the printed surface 301b of the circuit printed board 301, and FIG. 8C shows the printed surface 302b of the circuit printed board 302. FIG. 8D shows a printed circuit board 303 for support.

  Print lines 2, 4, and 6 are formed on the print surface 301b of the circuit printed board 301, and print lines 1, 3, 5, and 6 are formed on the print surface 302b of the circuit print board 302. Via holes 2c to 5c and 2d to 5d are provided in the print lines 1 to 5, respectively, and serve as attachment positions of the resistors R2 to R5.

  The circuit printed boards 301 and 302 and the support printed board 303 are formed with via holes 1b and 6b in the lower portion, so that electrical connection between the circuit printed boards 301 and 302 and the support printed board 303 can be achieved. Yes. Similarly, via holes 2c to 5c and 2d to 5d are provided in the circuit printed boards 301 and 302 and the support printed board 303, respectively, and serve as attachment positions of the resistors R2 to R5. In the circuit printed board 301, the via holes 2c and 3d are electrically connected, and the via holes 4c and 5d are electrically connected. In the circuit printed board 302, the via holes 3c and 4d are electrically connected.

  Resistors R2 to R5 are mounted on the support printed circuit board 303 at positions connected to the via holes 2c to 5c and 2d to 5d. Note that the arrangement of the print lines shown in FIG. 8 is merely an example, and the arrangement of the print lines can be appropriately changed as long as the arrangement is a print line in which the resistors R2 to R5 are connected in series.

  FIG. 9 is a block diagram illustrating the connection between the wear gauge main body 300 and the measurement unit 305. As shown in the figure, the print lines 1 to 5 are connected to the connection unit 305-1 of the measurement unit 305 via the terminal 1c and connected to the common print line 6 connected to the connection unit 305-6. As a whole, a wear gauge circuit portion which is one circuit in which the resistors R2 to R5 are connected in series is formed. The measuring unit 305 measures the resistance value between the terminals 1c and 6c and detects the wear of each of the wear detection print lines 1a to 5a.

  The specific operation of the wear gauge main body 300 of this embodiment will be described as follows. In the initial state, electrical continuity between the terminals 1c and 6c of the wear gauge 300 is continuity through the print line 1, and its resistance value is zero.

  When the wear detection print line 1a, which is positioned closest to the sliding surface of the wear gauge 300, disappears due to wear, the electrical continuity of the wear gauge circuit portion is changed from the continuity through the print line 1 to the print line 2. And the conduction through the resistor R2, and its resistance value is r (Ω). By detecting that the resistance value between the terminals 1c and 6c is r (Ω), it is possible to detect the start of wear.

  Next, when the wear detection print line 2a disappears due to wear, the electrical continuity of the wear gauge circuit portion changes from continuity via the print line 2 to continuity via the print line 3 and the resistors R2 and R3, and the resistance value is 2r (Ω). By detecting that the resistance value between the terminals 1c and 6c is 2r (Ω), it is possible to detect that the wear has progressed L1.

  Similarly, by detecting that the resistance value between the terminals 1c and 6c is 3r (Ω), it is possible to detect that the wear has progressed L2, and by detecting that the resistance is 4r (Ω). It can be detected that the wear has progressed L3, and the loss of conduction between the terminals 1c and 6c can be detected as the wear has progressed L4.

  In the wear gauge of this embodiment, two lead wires are provided and input to the measuring device 305. However, the present invention is not limited to this. For example, one of the lead wires may be grounded to the apparatus main body. According to this method, since one lead wire can be drawn to the measuring device 305, wiring to a simpler gauge can be achieved.

  As described above, according to the wear gauge of the third embodiment of the present invention, in addition to the effects of the wear gauge of the first embodiment and the second embodiment, by attaching a plurality of resistors in series, the wear gauge The number of lead wires from can be reduced. Also, by confirming that the resistance value of the gauge body is 0Ω before using the gauge, the soundness of the gauge can be confirmed.

  The above-described embodiments described above can be implemented with various changes and improvements.

  The wear gauges of the above embodiments include bearing wear, cutting tools for machine tools, automobile tires and brake pads, sliding parts for general machines, clutches and brakes for general machines, rolls for rolling mills, etc. It is possible to detect wear on the sliding surface of the machine, measure the contact around the center part of a long shaft (shaft), rotating body (gap sensor function), detect wear of railway rails, machine tools, etc. The present invention can be widely applied to detection of wear of sliding parts such as guide rails and detection of displacement in the axial direction (thrust) of the shaft.

It is a figure which shows the external appearance of the wear gauge of 1st Embodiment of this invention. It is a figure which shows the other shape of the print line for abrasion detection of 1st Embodiment of this invention. It is a block diagram showing the connection of the wear gauge and measurement part of 1st Embodiment of this invention. It is a figure which shows an example of the attachment to the industrial machine of the wear gauge of 1st Embodiment of this invention. It is a figure which shows the external appearance of the wear gauge of 2nd Embodiment of this invention. It is a figure which shows arrangement | positioning of the print line of the abrasion gauge of 2nd Embodiment of this invention. It is a figure which shows the external appearance of the wear gauge of 3rd Embodiment of this invention. It is a figure which shows arrangement | positioning of the print line of the abrasion gauge of 3rd Embodiment of this invention. It is a block diagram showing the connection of the abrasion gauge and measurement part of 3rd Embodiment of this invention.

Explanation of symbols

1 to 5: Print line 6: Common print lines 1a to 5a: Print line for wear detection 100: Wear gauge

Claims (8)

A wear gauge for detecting wear of sliding members of industrial machines,
One or more wear detection lines that can be fixed to the sliding member and are arranged at intervals at the tip end portion thereof, and the one or more wear detection lines wear out in stages as the sliding member wears. A wear gauge comprising a wear gauge body made of an insulating plate.   One or more wear detection circuits each including the one or more wear detection lines in a circuit are provided, and each of the one or more wear detection circuits is stepped with the stepwise wear of the one or more wear detection lines. The wear gauge according to claim 1, further comprising a wear gauge circuit portion that is cut off mechanically. The wear gauge main body is
The wear gauge according to claim 1 or 2, wherein a plurality of circuit insulating plates each having the one or more wear detection lines are laminated. The wear gauge main body is
The wear gauge according to any one of claims 1 to 3, wherein a support insulating plate is further laminated. The formation surface of the circuit insulation plate wear detection line is:
The wear gauge according to claim 4, wherein the wear gauge is sandwiched between inner surfaces of the laminated circuit insulating plate and support insulating plate. The wear gauge circuit portion is
A resistor mounted on the wear gauge body and having a predetermined resistance value disposed on at least one wear detection circuit of the one or more wear detection circuits;
The wear gauge according to any one of claims 1 to 5, wherein a resistance value of the entire wear gauge circuit portion changes stepwise as the one or more wear detection lines wear stepwise. . The insulating plate constituting the wear gauge main body is:
The wear gauge according to any one of claims 1 to 6, comprising a printed circuit board selected from a rigid board or a flexible board according to the sliding member. The wear gauge main body is
The wear gauge according to any one of claims 1 to 7, further comprising a fixing hole at a substantially central portion.

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