JP2008122367A - Device for measuring wire rope pitch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To measure wire rope pitch accurately and simply, without having to rely on visual checks. <P>SOLUTION: The device for measuring wire rope pitch which is equipped with two grasping sections 12, probes 40A and 42A are located in between the two grasping sections 12 for determining two measuring points; and a linear holding section 52, having the two grasping sections 12 at the both edge, for holding the probes in between the two grasping sections 12. The probes are mutually movable in parallel and are vertically movable with respect to a wire rope 32 that is grasped and fixed by the two grasping sections 12, with the external shape of the tip being such that it is thinner the closer it is to the tip; and the linear holding section 52 movably holds at least one of the probes in its longitudinal direction and furthermore, can when the two grasping sections 12 grasps two places of the wire rope 32 for placing on a flat horizontal plane, locate the tip of the probes at the center of the axis of the wire rope 32, as viewed downward from directly above. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wire rope pitch measuring apparatus capable of accurately and simply measuring the pitch of a wire rope without relying on visual observation.

  Conventionally, the pitch of the wire rope has been measured as shown in FIGS. First, as shown in FIG. 7A, a white paper 104 with carbon paper 102 sandwiched is placed on the wire rope 100, and a rod-like object such as a pen 106 is slid on the white paper 104 in the length direction of the wire rope. Then, the wire shape constituting the wire rope 100 is transferred to the white paper 104, and then the white paper 104 is peeled off from the wire rope 100 as shown in FIG. Next, as shown in FIGS. 7C and 7D, by opening the blank paper 104 and removing the carbon paper 102, the wire shape 108 transferred onto the blank paper 104 as shown in FIG. 7E. Is obtained. And the pitch of a wire rope was measured by measuring the obtained strand shape 108 with a caliper or a ruler. FIG. 7 shows a 6-strand rope as an example. In this case, the pitch of the wire rope can be measured by measuring the distance corresponding to 6 strands in the transferred strand shape.

  In this method, it is necessary to press the rod-like object onto the white paper on the wire rope with a certain strength and to keep the sliding direction constant in the longitudinal direction of the rope, but it depends on the operator's sense. For this reason, there is a possibility that the shape of the wire rope may not be correctly transferred, and the error in the measured value tends to increase. Furthermore, the measurement accuracy may decrease due to the density of the transfer with carbon paper.

  On the other hand, it is conceivable to measure by directly applying a caliper or a ruler to the surface of the wire rope. turn into. Further, it is difficult to apply a caliper or a ruler to a measurement object having a round cross-sectional shape, and it is difficult to measure with high accuracy.

  On the other hand, in Patent Document 1, “a twisted pitch measuring instrument for divided conductors, characterized in that one side edge of a plate-like auxiliary body is connected in a mountain shape to one side edge of a plate-like ruler. (See FIG. 8) has been proposed. This twist pitch measuring instrument 110 is formed by connecting an auxiliary body 114 to one end of a ruler 112. The auxiliary pitch measuring instrument 110 is placed on the divided conductor 118 along the longitudinal direction of the divided conductor 118, and the pitch p is visually read by the scale 116. Is.

  Further, in Patent Document 2, “a sample holding portion provided with a holding groove for holding a stranded wire in which M wires (M: an integer of 2 or more) to be measured are twisted in a straight line; Assuming a presser plate made of a transparent material that presses and fixes the stranded wire held in the holding groove, and a second plane parallel to a first plane including the central axis of the stranded wire, The first cursor is movable and fixed on a straight line parallel to the central axis included in two planes, and is a measurement standard set at a first predetermined position on any one of the strands constituting the stranded wire A reference point setting unit for aligning the first cursor with a projection measurement reference point obtained by projecting a point on the second plane, and the second cursor can be moved on the straight line to constitute the stranded wire A measurement point set at a second predetermined position different from the first predetermined position on the strand is moved forward. The measurement point setting unit for aligning the second cursor with the projected measurement point projected onto the second plane, and the distance between the first cursor and the second cursor are N / M times the twist pitch (N: natural number) The twist pitch measuring device characterized by comprising a display unit for displaying as a value of).

Japanese Utility Model Publication No. 62-42003 JP-A-9-152301

  The techniques proposed in Patent Documents 1 and 2 are both techniques for measuring the pitch of a wire rope by measuring the distance between two points on the wire rope, but the two points are determined visually. Therefore, errors are likely to occur in the measured values.

  This invention is made | formed in view of this problem, Comprising: It aims at providing the measuring apparatus which can measure the pitch of a wire rope accurately and simply without relying on visual observation.

  The present inventor believes that in order to measure the pitch of the wire rope without relying on visual observation, it is necessary to mechanically determine two points for distance measurement by pressing the measuring element against the surface of the wire rope. It was. Specifically, it was thought that it was only necessary to determine the two points for measurement by inserting the tip of the probe into the center of the valley between the strands.

  Although it was considered that a caliper jaw was used as the measuring element, a commercially available caliper jaw could not be used because it did not enter the valley between the strands. Therefore, the caliper jaws were improved so that the shape of the tip becomes thinner as it goes to the tip, and the apex of the tip comes to the center of the valley between the strands as the measurement position.

  In addition, since the strands that make up the wire rope are inclined with respect to the longitudinal direction of the wire rope, when the wire rope is placed on a flat horizontal surface, the position where the tip of the probe is inserted is viewed from directly above. Since accurate measurement cannot be performed if it deviates from the axis of the rope, the position where the tip of the probe is applied is prevented from deviating from the axis of the wire rope viewed from directly above.

  That is, the wire rope pitch measuring device according to the present invention includes two gripping portions for gripping and fixing the wire rope in its radial direction, and two measurements for measuring the distance between the two gripping portions. Two measuring elements for determining a point, and a linear holding part having the two gripping parts at both ends and holding the two measuring elements between the two gripping parts, The two measuring elements can be moved in parallel with each other, and can be moved vertically with respect to the wire rope held and fixed by the two holding parts, and further, the tip of the measuring element The linear holding portion holds at least one of the two measuring elements movably in the longitudinal direction thereof, and further, the two gripping portions A flat horizontal surface by grasping two places on the wire rope When placed, the distal end portion of said two feeler, characterized in that it can now be located on the axis of the wire rope when viewed from directly above.

  For example, each of the two gripping portions is provided with a pair of gripping arms, the pair of gripping arms are connected to each other by a freely rotatable pin contact, and the two measuring elements can move in parallel with each other. When viewed from the direction, the tip of the two measuring elements is positioned on a straight line that is the rotation center of the pin contact, so that the wire rope pitch can be measured accurately.

  Further, each of the two gripping portions is provided with a pair of gripping arms, and the pair of gripping arms can perform an opening / closing movement for opening and closing at least one end in order to grip the wire rope. Even when the opening and closing movement is performed, the target center line of the pair of gripping arms when viewed from the longitudinal direction of the linear holding portion is always parallel to the direction in which the two measuring elements can move in parallel with each other. By doing so, the measurement of the wire rope pitch can be made more accurate.

  Specifically, for example, each of the pair of gripping arms is provided with a gear, the gears mesh with each other, and even if one end of the pair of gripping arms is opened and closed to grip the wire rope, the pair of gripping arms It is conceivable that the opening angle of each gripping arm is always the same.

  Here, the opening angle is an angle formed by the axis of the gripping arm with respect to a direction in which the two measuring elements can move in parallel with each other. An axial center is a line that connects centroid points of a cross section of a member.

  When the measuring element is viewed from a direction perpendicular to the direction in which the two measuring elements can move in parallel with each other and perpendicular to the longitudinal direction of the linear holding portion, the measuring element It is preferable that the angle of the tip of the is an obtuse angle larger than 90 °.

  One of the two measuring elements may be fixed to the linear holding portion, and the other may be slidably held on the linear holding portion.

  A scale may be shaken on the linear holding part, or a digital display for displaying the distance between the two measurement points may be provided.

  When the two gripping portions located at both ends of the wire rope pitch measuring apparatus according to the present invention are gripped at two locations on a flat horizontal surface, the tip ends of the two measuring elements are viewed from directly above. It can be positioned on the axis of the wire rope. Therefore, if the wire rope pitch is measured using the wire rope pitch measuring apparatus according to the present invention, the two points for distance measurement can be surely positioned on the axis of the wire rope viewed from directly above. Thus, a measurement error unlike when two measurement points are visually determined is less likely to occur.

  In addition, the wire rope pitch can be measured by simply inserting the tip portions of the two measuring elements into the valleys between the two strands corresponding to the distance corresponding to the number of strands of the wire rope, and easily measured. be able to.

  In addition, a pair of gripping arms is provided in each of the two gripping portions, and the pair of gripping arms when viewed from the longitudinal direction of the linear holding portion even if the pair of gripping arms open and close to grip the wire rope. The target center line of the gripper arm is flat when the two probes are always parallel to the direction in which they can move in parallel with each other, or when measuring with respect to the wire rope in use. Even when it is difficult to place on a horizontal plane, the wire rope pitch can be measured easily and accurately.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  In FIG. 1, (A) front view of the wire rope pitch measuring apparatus 10 which concerns on 1st Embodiment of this invention, and the horizontal sectional view which follows the II line | wire of (B) (A) are shown. The wire rope pitch measuring device 10 includes a gripping part 12, a measurement position determining part 14, and a holding part 16.

  The grip portion 12 includes grip portions 12A and 12B having the same shape, and both have a pair of grip arms 18 and a spring 20 as shown in FIG. The pair of gripping arms 18 are located at both ends of the spring 20, two supporting plates 22 that receive the force from the spring 20, two scissors plates 24 that are sandwiched in direct contact with the wire rope 32, and the supporting plate 22 at one end. The other end has a scissor plate 24, two stress transmission members 26 that transmit the force from the spring 20 to the two scissor plates 24 in the direction in which the two scissor plates 24 are closed, and one end is a stress transmission member. 26, two connecting members 30 which are connected and fixed in the vicinity of the middle portion of the H. 26, and whose other ends are rotatably connected to each other by pins 28. 2A is a side view before the wire rope 32 is sandwiched, and FIG. 2B is a side view after the wire rope 32 is sandwiched.

  The measurement position determination unit 14 includes a fixed side measurement position determination unit 40 and a movement side measurement position determination unit 42. The fixed-side measurement position determining unit 40 and the moving-side measurement position determining unit 42 have measuring elements 40A and 42A, respectively. The measuring element 40A of the fixed-side measurement position determining unit 40 is slidably coupled to a slider 40B fixed to the holding unit 16 (slide plate 52), and is a wire that is gripped and fixed by the gripping units 12A and 12B. It can slide in the direction perpendicular to the rope 32 (the width direction of the slide plate 52). The measuring element 42A of the moving side measurement position determining unit 42 is connected to the slider 42B so as to be slidable. The measuring element 42A is perpendicular to the wire rope 32 held and fixed by the gripping units 12A and 12B. It is possible to slide in the width direction. The slider 42B is connected and fixed to a slider 42C that can freely slide in the longitudinal direction of the holding portion 16 (slide plate 52).

  The tip portions of the measuring elements 40A and 42A have a shape that becomes narrower toward the tip, and can be inserted into the trough portions of the strands. The shape of the tip may be conical, or may be a quadrangular pyramid. FIG. 3 shows an example where the shape of the tip of the probe is a quadrangular pyramid. FIG. 3A shows the front direction when the wire rope is sandwiched as shown in FIG. 1 (the direction perpendicular to the direction in which the measuring elements 40A and 42A slide in parallel with each other, and the slide plate. FIG. 3B is a side view seen from the longitudinal direction of the wire rope. The numerical values shown in FIGS. 3A and 3B are approximate guidelines.

  Further, as shown in the horizontal cross-sectional view of FIG. 1B, the straight line whose tip ends of the measuring elements 40A and 42A serve as the rotation center of the pin 28 when viewed from the direction in which the measuring elements 40A and 42A slide. Must be on the same straight line. In this way, the wire rope pitch measuring device 10 is placed on a horizontal and flat table so that the lower ends of the total four scissors plates 24 of the grip portions 12A and 12B are all in contact with the surface of the flat table. Then, the opening angle of each of the pair of gripping arms 18 becomes the same angle, and the tip portions of the measuring elements 40A and 42A are located on the axis of the wire rope when viewed from right above.

  The holding portion 16 includes a rigid slide plate 52 and a connecting member 54 that connects the slide plate 52 to the pin 28 of the grip portion 12. A slider 40B of the fixed-side measurement position determination unit 40 is connected and fixed to the slide plate 52, and the slider 42C of the movement-side measurement position determination unit 42 can freely slide in the longitudinal direction of the slide plate 52. It is connected.

  As shown in FIG. 1B, the connecting member 54 connects the pin 28 and the slide plate 52 while shifting the center line, and is viewed from a direction parallel to the direction in which the measuring elements 40A and 42A slide. Sometimes, the tip portions of the measuring elements 40A and 42A are on a straight line that becomes the rotation center of the pin 28.

  If the scale is shaken on the slide plate 52, the scale is read, so that the distance between the tip of the probe 40A of the fixed-side measurement position determining unit 40 and the tip of the probe 42A of the moving-side measurement position determining unit 42 is read. Can be measured.

  Further, as shown in FIG. 1, a linear encoder is constituted by the slide plate 52 and the slider 42C, and a digital indicator 42D for displaying the measured value of the linear encoder on the slider 42B and the slider 42C of the moving side measurement position determining unit 42. And the distance between the tip of the probe 40A of the fixed-side measurement position determining unit 40 and the tip of the probe 42A of the moving-side measurement position determining unit 42 may be displayed on the digital display 42D.

  Next, the case where the pitch of a wire rope is actually measured using the wire rope pitch measuring apparatus 10 which concerns on embodiment of this invention is demonstrated. Here, the case of a wire rope composed of six strands will be described.

(1) First, the wire rope 32 is sandwiched between the two gripping portions 12A and 12B. At this time, a force is applied by hand in the direction of contracting the spring 20 to widen the distance between the two scissor plates 24, and the wire The rope 32 is sandwiched between the two scissors plates 24.

(2) The wire rope pitch measuring device 10 sandwiching the wire rope 32 is placed on a flat surface with a flat surface, and the lower ends of the total four scissors plates 24 of the grip portions 12A and 12B are all the horizontal table. Make contact with the surface. By doing so, the opening angles of the pair of gripping arms 18 respectively possessed by the gripping portions 12A and 12B are the same. Both of the tip portions of the 42 measuring elements 42A are located on the axis of the wire rope when viewed from directly above. For this reason, an accurate wire rope pitch can be measured.

(3) Adjusting the position of the wire rope pitch measuring device 10 relative to the wire rope 32 while sliding the tip of the probe 40A of the fixed-side measurement position determining unit 40 downward, the tip of the probe 40A is adjusted. It is inserted into an arbitrary strand valley of the wire rope 32, and the position of the fixed-side measurement position determining unit 40 is determined.

(4) Next, while sliding the slider 42C of the moving side measurement position determining unit 42 in the horizontal direction by the six strands, the tip of the probe 42A of the moving side measurement position determining unit 42 is slid downward. The tip end of the probe 42A is inserted into the strand trough. The tip portion fits in the center of the valley while contacting the strand.

(5) The distance between the tip of the probe 40A of the fixed-side measurement position determining unit 40 and the tip of the probe 42A of the moving-side measurement position determining unit 42 is read from the digital display 42D.

  As described above, the wire rope pitch is measured using the wire rope pitch measuring apparatus 10 according to the embodiment of the present invention, and as a result, the measurement error is 0.3% or less. It was about 1/10 of the maximum measurement error of 3%.

  Next, the wire rope pitch measuring device 60 according to the second embodiment of the present invention will be described. FIG. 4 is a side view showing the wire rope pitch measuring device 60 according to the second embodiment of the present invention (as viewed from the longitudinal direction of the grasped wire rope), and FIG. It is a front view which shows one of the two same holding parts 61 with which it is provided. The wire rope pitch measurement device 60 according to the second embodiment is an improvement of the grip portion 12 of the wire rope pitch measurement device 10 according to the first embodiment.

  The gripping part 61 of the wire rope pitch measuring device 60 according to the second embodiment has a gripping arm 62, a gear 64, a support member 66, a bolt 68, a nut 70, a washer 72, and a spacer 74. It becomes.

  There are two gripping arms 62 that are paired. Each gripping arm 62 includes a stress transmission arm 62A, a presser plate 62B, and a scissor plate 62C. The gripping arm 62 sandwiches the wire rope 32. Have a fixed role. Gears 64 are fixedly attached to the upper ends of the two stress transmission arms 62A by pins (not shown).

  The support member 66 is a rectangular parallelepiped member, and two bolts 68 are attached to the upper part of one end in a horizontal direction as shown in FIG. 4, and the slide plate 52 is disposed in the width direction at the other end. Is fixedly attached so as to be in the downward direction of FIG.

  The bolt 68 has a protrusion 68A, and a portion ahead of the protrusion 68A is embedded in the support member 66 and fixed. The stress transmission arm 62A, which is fixedly attached to the upper end portion of the gear 64, is pivotably attached to the bolt 68 together with the gear 64, and in FIG. 64 and the stress transmission arm 62A are arranged in this order. Further, on the left side of the stress transmission arm 62A, a circular spacer 74, a washer 72, and a nut 70 are passed through the bolt 68 in order from the right, and the stress transmission arm 62A and the gear 64 are connected to the bolt 68. It can be rotated as a center.

  The gears 64 fixedly attached to the upper ends of the two stress transmission arms 62A are paired, and the pair of gears are engaged with each other. Therefore, as shown in FIG. 4, the opening angles of the pair of gripping arms 62 (stress transmitting arms 62 </ b> A) are always the same, and the pair of gripping arms 62 are viewed from the longitudinal direction of the slide plate 52. The target center line L of the pair of gripping arms 62 does not rotate relative to the slide plate 52 even when the gripping arms 62 are opened and closed, and the measuring elements 40A and 42A are always parallel to each other. Is parallel to the direction of sliding movement (vertical direction in FIG. 4).

  For this reason, unlike the first embodiment, when the wire rope 32 is sandwiched and measured, the entire wire rope pitch measuring device 10 is placed on a flat surface with a flat surface, and the grip portions 12A and 12B. Even if all the lower ends of the four scissors plates 24 are not in contact with the surface of the horizontal base, the tip of the probe 40A of the fixed-side measurement position determining unit 40 and the probe of the moving-side measurement position determining unit 42 Since the tip of 42A is located on the axis of the wire rope when viewed from the direction in which the tips of the measuring elements 40A and 42A slide in parallel with each other, accurate measurement is possible. It becomes. For this reason, the wire rope pitch measuring device 50 according to the second embodiment is used even when it is difficult to place on a horizontal table, such as when measuring a wire rope in use. Thus, the wire rope pitch can be measured easily and accurately.

  In addition, the structure of the grip part 12 in the wire rope pitch measuring apparatus 10 according to the first embodiment is a structure in which the pair of gripping arms 18 can freely rotate around the pin 28, and the pair of gripping arms 18 are slid. The target center line of the pair of gripping arms 18 when viewed from the longitudinal direction of the plate 52 can be rotated relative to the direction in which the measuring elements 40A and 42A slide and move in parallel with each other. Therefore, in order to make the opening angles of the pair of gripping arms 18 the same, as described above, the wire rope pitch measuring device 10 sandwiching the wire rope 32 is placed on a flat surface with a flat surface. It is necessary to place all the lower ends of the four scissors plates 24 of the gripping portions 12A and 12B in contact with the surface of the horizontal table.

  As described above, the first embodiment and the second embodiment have been described. However, the mechanism for sandwiching the wire rope is a mechanism for opening and closing the grip arms 18 and 62 in the circumferential direction like the mechanism of the grip portions 12 and 61. For example, a mechanism may be used in which the connection with the pin 28 is stopped in FIG.

  Further, the shape of the tip of the probe 40A, 42A is not an acute quadrangular pyramid such that the angle of the tip seen from the front direction is 40 ° as shown in FIGS. Rather, the obtuse angle greater than 90 ° is preferable for the angle of the tip as viewed from the front direction. For example, as shown in FIGS. 6 (A) (front view) and (B) (side view), it is preferable to increase the angle of the tip portion viewed from the front direction to about 110 °. If the angle of the tip of the quadrangular pyramid is small and acute, the tip of the probe will go too far between the strands during measurement, and the sharp apex of the tip will pierce the core rope or strand of the wire rope. It may stop at a position that is not in the middle.

  When the angle of the front end viewed from the front direction is an obtuse angle larger than 90 °, for example, about 110 ° as shown in FIG. 6A, the apex of the front end does not enter between the strands, and the apex is It does not reach the core rope of the wire rope 32 and does not pierce the strands. For this reason, the leading end portions of the measuring elements 40A and 42A descend along the circumferential direction of the surface of the adjacent strands, and the leading end portions of the measuring elements 40A and 42A are surely positioned at the center position between the adjacent strands. Therefore, accurate measurement is possible. Note that the numerical values shown in FIGS. 6A and 6B are approximate guidelines.

  As described above, by using the wire rope pitch measuring apparatus according to the present invention, it is possible to accurately measure the pitch of the wire rope by a simple method.

  In addition, the wire rope pitch measuring device according to the present invention includes an inspection at the time of manufacturing the wire rope, an inspection before using the product wire rope, an inspection of the wire rope attached to the overhead crane in use, and a wire rope removed after use. It can be used for the inspection of the wire rope and can be used regardless of the usage state of the wire rope.

The (A) front view which shows the wire rope pitch measuring apparatus which concerns on 1st Embodiment of this invention, and the horizontal sectional view which follows the II line | wire of (B) (A) It is the side view seen from the longitudinal direction of the grasped wire rope which shows the grasping part of the wire rope pitch measuring device, (A) The side view before pinching the wire rope, (B) After sandwiching the wire rope Side view (A) Front view showing the measuring element of the wire rope pitch measuring device as viewed from the front (direction perpendicular to the longitudinal direction of the wire rope) when the wire rope is sandwiched as shown in FIG. ) Side view of wire rope viewed from the longitudinal direction The side view seen from the longitudinal direction of the grasped wire rope which shows the wire rope pitch measuring apparatus which concerns on 2nd Embodiment of this invention. Front view showing one of the grip portions of the wire rope pitch measuring device (A) The front view which shows the measuring element of the said wire rope pitch measuring apparatus, (B) Same side view Explanatory drawing which shows the method of measuring the conventional wire rope pitch The perspective view which shows one Example of the twist pitch measuring tool of patent document 1

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 60 ... Wire rope pitch measuring device 12, 12A, 12B ... Grasp part 14 ... Measurement position determination part 16 ... Holding part 18 ... Grasping arm 20 ... Spring 22 ... Supporting plate 24 ... Scissor board 26 ... Stress transmission material 28 ... Pin DESCRIPTION OF SYMBOLS 30 ... Connection material 32 ... Wire rope 40 ... Fixed side measurement position determination part 42 ... Movement side measurement position determination part 40A, 42A ... Measuring element 40B, 42B, 42C ... Slider 42D ... Digital indicator 52 ... Slide board 54 ... Connection material 61 ... Grasping part 62 ... Grasping arm 62A ... Stress transmission arm 62B ... Presser plate 62C ... Scissor plate 64 ... Gear 66 ... Support member 68 ... Bolt 68A ... Projection part 70 ... Nut 72 ... Washer 74 ... Spacer

Claims (8)

Two grips for gripping and fixing the wire rope in its radial direction;
Two styluses located between the two grips and determining two measurement points for measuring the distance;
A linear holding part having the two gripping parts at both ends and holding the two measuring elements between the two gripping parts,
The two measuring elements are movable in parallel with each other, and are movable vertically with respect to the wire rope held and fixed by the two gripping portions, and further, the tip of the measuring element The outer shape of the part becomes thinner toward the tip,
The linear holding portion holds at least one of the two measuring elements in the longitudinal direction so as to be movable,
Further, when the two gripping portions are gripped at two locations on the wire rope and placed on a flat horizontal surface, the tip portions of the two measuring elements are positioned on the axis of the wire rope when viewed from directly above. A wire rope pitch measuring device characterized in that the device can be used.   Each of the two gripping portions has a pair of gripping arms, the pair of gripping arms are connected to each other by a freely rotating pin contact, and the two measuring elements can move in parallel with each other. 2. The wire rope pitch measuring device according to claim 1, wherein when viewed from a direction, tip ends of the two measuring elements are located on a straight line that is a rotation center of the pin contact.   Each of the two gripping portions has a pair of gripping arms, and the pair of gripping arms can open and close at least one end to grip the wire rope, and the pair of gripping arms. Even when the opening / closing movement is performed, the target center line of the pair of gripping arms when viewed from the longitudinal direction of the linear holding portion is always in the direction in which the two measuring elements can move in parallel with each other. 2. The wire rope pitch measuring device according to claim 1, wherein the wire rope pitch measuring device is parallel.   Each of the pair of gripping arms includes a gear, and the gears mesh with each other. Even when one end of the pair of gripping arms is opened and closed to grip the wire rope, the opening angle of each of the pair of gripping arms is 4. The wire rope pitch measuring device according to claim 3, wherein the wire rope pitch measuring device is always the same.   When the measuring element is viewed from a direction perpendicular to the direction in which the two measuring elements can move in parallel with each other and perpendicular to the longitudinal direction of the linear holding portion, the measuring element The wire rope pitch measuring device according to any one of claims 1 to 4, wherein an angle of a tip portion of the wire rope is an obtuse angle larger than 90 °.   The one of the two measuring elements is fixed to the linear holding part, and the other is slidably held by the linear holding part. The wire rope pitch measuring apparatus in any one.   The wire rope pitch measuring device according to any one of claims 1 to 6, wherein a scale is swung on the linear holding portion.   The wire rope pitch measuring device according to any one of claims 1 to 7, further comprising a digital display for displaying a distance between the two measurement points.

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