Rope tension measuring device

Abstract

To provide a rope tension measuring device capable of measuring tension greater than the rated output value of the measuring instrument. [Solution] The rope support sections 20 and 40 of the rope tension measuring device 1 are spaced apart from each other in a first direction D1. The moving mechanism 31 moves the second rope support section 40 along a second direction D2. The moment section 50 is located between the first rope support section 20 and the second rope support section 40 in the first direction D1, and between the rope support section 20 and the tip of the measuring instrument 60 in the second direction D2. The moment section 50 has a swinging section 51 that can swing about a swinging rotation axis 53 along a third direction D3, and a rope pressing section 55 that protrudes from the swinging section 51 toward the rope support sections 20 and 40. The measuring instrument 60 is positioned so that its tip faces the swinging section 51. The distance between the position on the swinging section 51 facing the tip and the swinging rotation axis 53 is longer than the distance between the rope pressing section 55 and the swinging rotation axis 53.

Description

[Technical Field]

[0001] Embodiments of the present invention relate to a rope tension measuring device. [Background Art]

[0002] An elevator car is supported by a plurality of ropes, and driven by a hoisting machine, it moves up and down together with a counterweight in the hoistway via these ropes. To stably lift and lower the car, it is necessary to uniformly adjust the tension of the ropes.

[0003] To adjust the tension of ropes, a tension measuring device is used. The tension measuring device disclosed in Japanese Patent No. 5886724 comprises a measuring instrument and a hook attached to the measuring instrument, and measures the rope tension by hooking the hook on the rope, pulling the measuring instrument to apply a load to the rope. The tension measuring device measures the restoring force of the rope to which the load is applied as the tension of the rope. [Prior Art Documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent No. 5886724 [Summary of Invention] [Problem to be Solved by Invention]

[0005] Incidentally, a rope with a large diameter requires a large load to be applied during tension measurement, and therefore the restoring force applied to the measuring instrument is also large. For this reason, a measuring instrument with a general rated output value cannot measure the tension of a rope with a large diameter. Some ropes used in elevators have large diameters. It is conceivable to use a measuring instrument with a large rated output value to measure the tension, but such a measuring instrument is expensive and increases the cost for measuring the rope tension.

[0006] This invention has been made with these points in mind, and aims to provide a rope tension measuring device capable of measuring tension greater than the rated output value of the measuring instrument. [Means for solving the problem]

[0007] The rope tension measuring device according to this embodiment is Base and, A first rope support portion is attached to the base and supports the side of the rope to be measured, A second rope support portion supports the side of the rope from the same side as the first rope support portion at a position spaced apart in a first direction from the first rope support portion, A moving mechanism attached to the base, which supports the second rope support and moves along a second direction intersecting the first direction, A measuring instrument having a tip and a sensor for measuring the load applied to the tip, which is attached to the base between the first rope support portion and the second rope support portion in the first direction, A moment portion attached to the base between the first rope support portion and the second rope support portion in the first direction, and between the first rope support portion and the second rope support portion and the tip portion of the measuring instrument in the second direction, Equipped with, The moment portion includes a swinging portion attached to the base so as to be swingable about a swing rotation axis along a third direction intersecting the first and second directions, and a rope pressing portion that protrudes from the swinging portion toward the first rope support portion and the second rope support portion in the second direction, and against which the ropes supported by the first rope support portion and the second rope support portion are pressed. The measuring instrument is positioned such that its tip faces the oscillating part. The distance between the position on the oscillating part facing the tip and the oscillating rotation axis is longer than the distance between the rope pressing part and the oscillating rotation axis. [Brief explanation of the drawing]

[0008] [Figure 1]Figure 1 is a perspective view showing the overall configuration of a rope tension measuring device according to one embodiment. [Figure 2] Figure 2 is a plan view of the base. [Figure 3] Figure 3 is a perspective view of the moment section shown in Figure 1. [Figure 4] Figure 4 is a diagram illustrating how to use the rope tension measuring device. [Figure 5] Figure 5 is a diagram illustrating how to use the rope tension measuring device. [Figure 6] Figure 6 is a diagram illustrating how to use a rope tension measuring device with a modified example. [Figure 7] Figure 7 is a perspective view of the attachment used in the method shown in Figure 6. [Figure 8] Figure 8 is a perspective view showing a modified example of the first rope support section. [Figure 9] Figure 9 is a perspective view showing a modified example of the second rope support section. [Modes for carrying out the invention]

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0010] The rope tension measuring device 1 shown in Figure 1 is used, for example, to measure the tension of the ropes supporting an elevator car. As shown in Figure 1, the rope tension measuring device 1 has a base 10, a first rope support part 20, a load part 30, a moment part 50, and a measuring instrument 60. The rope tension measuring device 1 of this embodiment is designed to measure rope tensions greater than the rated output value of the measuring instrument 60.

[0011] A rope tension measuring device 1 has a first direction D1, a second direction D2, and a third direction D3. The first direction D1, the second direction D2, and the third direction D3 intersect with one another. In the illustrated example, the first direction D1, the second direction D2, and the third direction D3 are orthogonal to one another. The first direction D1 of the rope tension measuring device 1 is generally along the extending direction of the rope R to be measured when rope tension measurement is performed. Furthermore, the second direction D2 of the tension measuring device 1 is generally along the direction of the restoring force applied to the tension measuring device 1 by the rope R to be measured when rope tension measurement is performed.

[0012] A base 10 supports a first rope support portion 20, a load portion 30, a moment portion 50, and a measuring instrument 60. In the illustrated example, the base 10 is a plate-shaped member. The base 10 may be made of a highly rigid material such as metal. The base 10 extends along a plane parallel to the first direction D1 and the second direction D2.

[0013] As shown in FIG. 2, the base 10 is formed with an opening 11 for attaching the moment portion 50, and first openings 12a to 12d for attaching the measuring instrument 60. Furthermore, the base 10 is formed with openings 14a and 14b for attaching the first rope support portion 20, and openings 15a to 15d for attaching the load portion 30.

[0014] Furthermore, the base 10 is formed with handle holes 16a and 16b into which fingers can be inserted. An operator performing rope tension measurement can firmly grip the rope tension measuring device 1 by inserting their fingers into the handle holes 16a and 16b. As a result, rope tension measurement is facilitated.

[0015] The first rope support portion 20 includes a first roller 21 and a support portion 25 that supports the first roller 21. The support portion 25 is fixed to the base 10. The support portion 25 is fixed parallel to the base 10 by fasteners 26 such as screws inserted through the openings 14a and 14b.

[0016] The first roller 21 is rotatable around a first roller rotation shaft 27 extending along the third direction D3. The first roller rotation shaft 27 is fixed to the support portion 25.

[0017] The first roller 21 has an outer circumferential surface 22 facing radially outward of a circle centered on the first roller rotation shaft 27. The outer circumferential surface 22 functions as a rope support surface that supports the side surface of the rope R to be measured. As will be described later, when measuring the tension of the rope R, the rope support surface 22 rotates as the rope R bends. This makes it possible to reduce friction between the rope R and the rope support surface 22 when the rope R bends.

[0018] A groove 23 for receiving the rope R is formed in the rope support surface 22. The groove 23 is recessed toward the radially inner side of a circle centered on the first roller rotation shaft 27. The groove 23 extends along the circumferential direction of the circle on the rope support surface 22. The groove 23 extends over the entire circumference of the first roller 21. By forming the groove 23 in the rope support surface 22, the risk of the rope R falling off the first roller 21 during rope tension measurement is suppressed.

[0019] In the illustrated example, the groove 23 is formed in a U shape. More specifically, a cross-section of the groove 23 along the radial direction of the circle centered on the first roller rotation shaft 27 and the third direction D3 is U-shaped. Of course, the groove 23 formed in the rope support surface 22 may have other shapes. For example, the groove 23 may be a V-shaped groove. More specifically, a cross-section of the groove 23 along the radial direction of the circle centered on the first roller rotation shaft 27 and the third direction D3 may be V-shaped. When the groove 23 is U-shaped or V-shaped, the first roller 21 can hold ropes of various rope diameters in the groove 23 such that they cannot move in the third direction D3.

[0020] The load section 30 includes a second rope support section 40 and a moving mechanism 31 that moves the second rope support section 40 in a second direction D2 relative to the base section 10. The moving mechanism 31 includes a support section 32 fixed to the base section 10, a moving section 33 and a lever 34 supported by the support section 32, and a connecting section 35 that connects the moving section 33 and the lever 34.

[0021] The support portion 32 is fixed to the base portion 10 by fasteners 39 such as screws inserted through openings 15a to 15d. The support portion 32 supports the movable portion 33 so that it can move along the second direction D2. The support portion 32 also supports the lever 34 so that it can rotate around a rotation axis 36 that extends along the first direction D1. The rotation axis 36 may be fixed to the support portion 32 or to the lever 34.

[0022] The movable part 33 is an elongated member extending along the second direction D2. The movable part 33 supports the second rope support part 40 at one end. The lever 34 is a substantially L-shaped member. The lever 34 is attached to the support part 32 at one end so as to be rotatable around the rotation axis 36. The lever 34 is rotatable relative to the support part 32 in a plane along the second direction D2 and the third direction D3.

[0023] As described above, the movable part 33 and the lever 34 are connected via a connecting part 35. In the illustrated example, one end of the connecting part 35 is connected to the other end of the movable part 33. The connecting part 35 is connected to the movable part 33 so as to be rotatable around a rotating shaft 37 extending along the first direction D1. The other end of the connecting part 35 is connected to the lever 34. The connecting part 35 is connected to the lever 34 so as to be rotatable around a rotating shaft 38 extending along the first direction D1. The rotating shaft 38 is located at the bend of the L-shaped lever part 34. The connecting part 35 is rotatable relative to the movable part 33 and the lever 34 in a plane along the second direction D2 and the third direction D3. The rotating shaft 37 may be fixed to the connecting part 35 or to the movable part 33. The rotating shaft 38 may be fixed to the connecting part 35 or to the lever 34. In this type of moving mechanism 31, when the lever 34 is rotated around the rotation axis 36, the connecting part 35 rotates relative to the lever 34 and the moving part 33, moving the moving part 33 in the second direction D2.

[0024] The second rope support section 40 includes a second roller 41 and a support section 45 that supports the second roller 41. The support section 45 is fixed to the movable section 33. The support section 45 is fixed to the movable section 33 by fasteners 46 such as screws inserted through one end of the movable section 33. The second rope support section 40 is spaced apart from the first rope support section 20 in the first direction D1.

[0025] The second roller 41 is rotatable around a second roller rotation axis 47 that extends along a third direction D3. The second roller rotation axis 47 is fixed to a support 45.

[0026] The second roller 41 has an outer circumferential surface 42 that faces radially outward from a circle centered on the second roller rotation axis 47. The outer circumferential surface 42 functions as a rope support surface that supports the side of the rope R to be measured. As will be described later, the rope support surface 42 rotates in conjunction with the bending of the rope R when measuring the tension of the rope R. This reduces friction between the rope R and the rope support surface 42 when the rope R bends.

[0027] A groove 43 for receiving the rope R is formed in the rope support surface 42. The groove 43 is recessed radially inward of a circle centered on the second roller rotation axis 47. The groove 43 extends along the circumferential direction of the circle on the rope support surface 42. The groove 43 extends around the entire circumference of the second roller 41. The formation of the groove 43 in the rope support surface 42 suppresses the risk of the rope R falling off the second roller 41 during rope tension measurement.

[0028] In the illustrated example, the groove 43 is formed in a U-shape. More specifically, the cross-section of the groove 43 along the radial direction of the circle centered on the second roller rotation axis 47 and the third direction D3 is U-shaped. Of course, the shape of the groove 43 formed on the rope support surface 42 may be other shapes. For example, the groove 43 may be V-shaped. More specifically, the cross-section of the groove 43 along the radial direction of the circle centered on the second roller rotation axis 47 and the third direction D3 may be V-shaped. The U-shape or V-shape of the groove 43 allows the second roller 41 to hold ropes of various diameters within the groove 43, preventing them from moving in the third direction D3.

[0029] The moment section 50 is located between the first rope support section 20 and the second rope support section 40 in the first direction D1. The moment section 50 is located between the rope support sections 20, 40 and the measuring instrument 60 in the second direction D2.

[0030] The moment section 50 has a swinging section 51 and a rope pressing section 55 fixed to the swinging section 51. In the illustrated example, the swinging section 51 is an elongated member. The swinging section 51 extends generally along the first direction D1. The swinging section 51 is attached to the base section 10 near the end on the first rope support section 20 side. Hereinafter, the end of the swinging section 51 on the first rope support section 20 side will be called the base end, and the end on the second rope support section 40 side will be called the tip.

[0031] A pivoting shaft 53 extending along the first direction D1 is inserted near the base end of the pivoting part 51. The pivoting part 51 is rotatable around the pivoting shaft 53 relative to the base 10. The pivoting shaft 53 is fixed to the base 10 with the pivoting shaft 53 inserted through the opening 11. The opening 11 may be an elongated hole extending in the second direction D2. In this case, the mounting position of the pivoting shaft 53 to the base 10 can be adjusted in the second direction D2. Therefore, the distance between the rope support parts 20, 40 and the pivoting part 51 and rope pressing part 55 in the second direction D2 can be adjusted in the second direction D2 according to the rope diameter of the rope R to be measured.

[0032] A cylindrical spacer 54 is positioned between the oscillating part 51 and the oscillating rotation shaft 53, surrounding the oscillating rotation shaft 53. The spacer 54 is fixed to the oscillating part 51. The spacer 54 extends between the oscillating part 51 and the base 10. This allows the oscillating part 51 to oscillate smoothly around the oscillating rotation shaft 53 together with the spacer 54.

[0033] The rope pressing portion 55 is fixed to the oscillating portion 51 in the vicinity of the oscillating rotation axis 53. The rope pressing portion 55 is located on the tip side of the oscillating portion 51 relative to the oscillating rotation axis 53. The rope pressing portion 55 protrudes from the oscillating portion 51 toward the first rope support portion 20 and the second rope support portion 40, generally along the second direction D2.

[0034] The tip of the rope pressing section 55 includes a rope pressing surface 56 against which the rope R is pressed. The rope pressing surface 56 generally faces the second direction D2. The rope pressing surface 56 faces the sides of the first rope support section 20 and the second rope support section 40. When measuring the tension of the rope R, the rope R is positioned between the rope pressing surface 56 in the second direction D2 and the rollers 21 and 41 of the rope support sections 20 and 40. The rope R, supported in the second direction D2 by the rope support sections 20 and 40, is pressed against the rope pressing surface 56.

[0035] A groove 57 for receiving the rope R is formed in the rope pressing surface 56. The groove 57 is recessed toward the oscillating part 51 along the circumferential direction of a circle centered on the oscillating rotation axis 53. The groove 57 extends along the longitudinal direction of the oscillating part 51 on the rope pressing surface 56. The formation of the groove 57 in the rope pressing surface 56 suppresses the risk of the rope R falling off the rope pressing part 55 during rope tension measurement.

[0036] In the illustrated example, a U-shaped groove 57 is formed on the rope pressing surface 56. More specifically, the cross-section of the groove 57 along the circumferential direction of the circle centered on the oscillating rotation axis 53 and the third direction D3 is U-shaped. Of course, the shape of the groove 57 formed on the rope pressing surface 56 may be other shapes. For example, the groove 57 may be V-shaped. More specifically, the cross-section of the groove 57 along the circumferential direction of the circle centered on the oscillating rotation axis 53 and the third direction D3 may be V-shaped. Because the groove 57 is U-shaped or V-shaped, the rope pressing part 55 can hold ropes of various diameters within the groove 57 so that they cannot move in the third direction D3.

[0037] The measuring instrument 60 includes a thin, rectangular measuring instrument body 61. The measuring instrument body 61 is attached to the base 10 by fasteners (not shown), such as screws, inserted through the first openings 12a to 12d. The measuring instrument body 61 is located between the first rope support portion 20 and the second rope support portion 40 in the second direction D2. Each of the first openings 12a to 12d may be an elongated hole extending in the second direction D2. In this case, the position of the measuring instrument body 61 on the base 10 can be adjusted in the second direction D2. Therefore, even if the position of the swinging portion 51 on the base 10 is changed in the second direction D2 according to the rope diameter of the rope R to be measured, the distance between the swinging portion 51 and the measuring instrument body 61 in the second direction D2 can be maintained at an appropriate distance.

[0038] The measuring instrument body 61 includes a sensor 62, a display unit 63, and an operation unit 64. The sensor 62 measures the load applied to the tip of the measuring instrument body 61. The sensor 62 may include, for example, a piezoelectric element, and may output a numerical value by converting the electrical signal output by the piezoelectric element in response to the load applied to the tip. The display unit 63 displays the measured value output by the sensor 62. The operation unit 64 may include a power button for turning the measuring instrument 60 ON / OFF and various operation buttons.

[0039] The measuring instrument body 61 is attached to the base 10 such that its tip is positioned on the side of the moment section 50. The tip of the measuring instrument body 61 faces the tip of the oscillating section 51 of the moment section 50. An attachment 65 is attached to the tip of the measuring instrument body 61. The attachment 65 is formed in a cylindrical shape overall and extends in the second direction D2. A recess is formed at the base end of the attachment 65 to receive the tip of the measuring instrument body 61. The tip of the attachment 65 is in contact with the side surface of the tip of the oscillating section 51. Therefore, when the oscillating section 51 swings toward the measuring instrument 60 and pushes the attachment 65, the attachment 65 pushes the tip of the measuring instrument body 61. With this configuration, when the rope R is pressed against the rope pressing section 55, the oscillating section 51 swings, and the tip of the measuring instrument body 61 is pushed.

[0040] Here, the attachment 65 is further away from the oscillating rotation axis 53 than the rope pressing portion 55. In other words, the distance W2 between the position on the oscillating portion 51 where the attachment 65 contacts and the oscillating rotation axis 53 is longer than the distance W1 between the rope pressing portion 55 and the oscillating rotation axis 53 (see Figure 5). Therefore, when the rope R is pressed against the rope pressing portion 55 and the oscillating portion 51 pushes the tip of the measuring instrument body 61 via the attachment 65, the force (+F2) exerted by the oscillating portion 51 on the tip of the measuring instrument body 61 is smaller than the force (+F1) that the rope pressing portion 55 receives from the rope R. The ratio of these forces (F1:F2) corresponds to the ratio (W1:W2) of distance W1 to distance W2. This can be easily understood by considering the balance between the moment of force (+F1) that the rope pressing part 55 receives from the rope R and the moment of repulsive force (-F2) that the tip of the measuring instrument body 61 applies to the oscillating part 51 via the attachment 65.

[0041] Here, as will be described later, in measuring rope tension, the restoring force that the rope R to be measured applies to the rope pressing part 55 is measured as the tension of the rope R. According to the rope tension measuring device 1 of this embodiment, the force F2 that the oscillating part 51 applies to the measuring device body 61 can be made smaller than the restoring force F1 that the rope R applies to the rope pressing part 55. Furthermore, the restoring force F1 can be determined based on the force F2 applied to the measuring device body 61 and the ratio of the distance W1 to the distance W2 (W1:W2). For this reason, according to the rope tension measuring device 1 of this embodiment, the tension of the rope R can be measured even if the tension of the rope R is higher than the rated output value of the measuring device 60.

[0042] Next, with reference to Figures 4 and 5, a method for measuring rope tension using the rope tension measuring device 1 will be described.

[0043] When measuring the tension of the ropes supporting the elevator car, workers enter the hoistway, stand on the elevator car, and measure the tension of each of the multiple ropes that suspend the car, one by one.

[0044] First, the power to the measuring instrument 60 is turned ON by operating the control unit 64. Next, as shown in Figure 4, the rope tension measuring device 1 is positioned on the rope R such that the rope R to be measured passes between the outer circumferential surfaces 22, 42 of the rollers 21, 41 of the rope support units 20, 40 and the rope pressing surface 56 of the rope pressing unit 55 in the second direction D2. The outer circumferential surfaces 22, 42 of the rollers 21, 41 face the side of the rope R from the same side. The rope pressing surface 56 of the rope pressing unit 55 faces the side of the rope R from the opposite side from the outer circumferential surfaces 22, 42. In the illustrated example, the rope tension measuring device 1 is positioned such that the rope R, which extends linearly in the vertical direction, passes through the groove 23 of the first roller 21, the groove 57 of the rope pressing unit 55, and the groove 43 of the second roller 41. At this time, the rope tension measuring device 1 may be tilted in its first direction D1 with respect to the direction in which the rope R extends.

[0045] Next, the rope tension measuring device 1 is rotated so that its first direction D1 aligns with the direction (up and down) in which the rope R extends. The lever 34 of the moving mechanism 31 is also operated to move the moving part 33, together with the second rope support part 40, toward the moment part 50 along the second direction D2. As a result, as shown in Figure 5, the rope R is pushed toward the moment part 50 in the second direction D2 by the rollers 21 and 41, and further pushed toward the rollers 21 and 41 in the second direction D2 by the rope pressing part 55. Therefore, the rope R bends at the position where the rope pressing part 55 is pressed. The restoring force of the bent rope R acts upon the rope pressing part 55.

[0046] Furthermore, when the second rope support section 40 is moved to press the rope R against the rope pressing section 55, the sides of the rope R are supported by the outer circumferential surfaces 22 and 42 of the rollers 21 and 41. As a result, the rollers 21 and 41 rotate as the rope R bends. Therefore, friction between the rope support sections 20 and 40 and the sides of the rope R can be suppressed, and the risk of the bending of the rope R being hindered by such friction is suppressed.

[0047] When the restoring force of the rope R acts on the rope pressing section 55, the tip of the oscillating section 51 of the moment section 50 pushes the tip of the measuring instrument 60 via the attachment 65. The force with which the oscillating section 51 pushes the tip of the measuring instrument 60 is measured by the sensor 62 of the measuring instrument 60. Based on the measured value and the ratio (W1:W2) of the distance W1 between the oscillating rotation axis 53 and the rope pressing section 55 and the distance W2 between the oscillating rotation axis 53 and the attachment 65, the restoring force of the rope R acting on the rope pressing section 55 is determined. This allows the tension of the rope R to be measured.

[0048] <Variation> Furthermore, various modifications can be made to the embodiment described above.

[0049] The moment section 50 may be detachably attached to the base 10. By removing the moment section 50, when measuring rope tension, the restoring force of the rope R to be measured can be directly applied to the measuring instrument 60 without going through the moment section 50. That is, the restoring force of the rope R can be directly measured by the measuring instrument 60. If the rope diameter of the rope R to be measured is small and its tension is expected to be less than or equal to the rated output value of the measuring instrument 60, the tension of the rope R can be easily measured by directly measuring the restoring force of the rope R with the measuring instrument 60 without going through the moment section 50. Generally, the smaller the rope diameter, the lower the tension of the rope R. Therefore, if the moment section 50 is detachably attached to the base 10, the rope tension can be measured using the moment section 50 or without using the moment section 50, depending on the rope diameter of the rope R to be measured. Such a rope tension measuring device is very useful, for example, when an elevator car is supported by multiple ropes of different diameters and the rope tension of each must be measured.

[0050] If the moment section 50 is detachable from the base section 10, the position of the measuring instrument 60 on the base section 10 may be adjustable. If the position of the measuring instrument 60 on the base section 10 is adjustable, the distance between the oscillating section 51 and the measuring instrument 60 can be adjusted to a distance suitable for measurement with the measuring instrument 60 when the moment section 50 is used, and the distance between the rope R and the measuring instrument 60 can be adjusted when the moment section 50 is not used.

[0051] In the example shown in Figure 6, the moment section 50 and the measuring instrument 60 are detachably attached to the base 10. The base 10 also has second openings 13a to 13d for attaching the measuring instrument 60, located at positions different from the first openings 12a to 12d. The second openings 13a to 13d are closer to the first rope support section 20 and the second rope support section 40 in the second direction D2 than the first openings 12a to 12d. In the illustrated example, the second openings 13a to 13d are approximately the same distance as the dimension of the moment section 50 along the second direction D2 as the first openings 12a to 12d are closer to the first rope support section 20 and the second rope support section 40 than the first openings 12a to 12d. As a result, by removing the moment unit 50 from the base unit 10 and attaching the measuring instrument 60 to the second openings 13a to 13d on the base unit 10, the rope supported by the rope support units 20 and 40 can be properly pressed against the tip of the measuring instrument 60 when measuring rope tension.

[0052] Furthermore, in the example shown in Figure 6, the second openings 13a to 13d are closer to the first rope support section 20 in the first direction D1 than the first openings 12a to 12d. In the illustrated example, the second openings 13a to 13d are closer to the first rope support section 20 than the first openings 12a to 12d by approximately the distance between the tip of the swinging section 51 and the rope pressing section 55 in the longitudinal direction of the swinging section 51. This makes it possible to make the positional relationship between the position on the rope R to be measured that is supported by the rope support sections 20 and 40 and the position between those positions where the rope R is pressed against the rope tension measuring device 1 and bent, whether the rope tension is measured using the moment section 50 or without using the moment section 50, approximately the same. Therefore, the conditions for generating a restoring force in the rope R when measuring rope tension (and thus the conditions for measuring rope tension) can be made approximately the same whether the moment section 50 is used to measure rope tension or not.

[0053] Each of the second openings 13a to 13d may be an elongated hole extending in the second direction D2. In this case, the position of the measuring instrument body 61 attached to the second openings 13a to 13d on the base 10 can be adjusted in the second direction D2. Therefore, the distance between the rope R and the measuring instrument body 61 in the second direction D2 can be set to an appropriate distance depending on the rope diameter of the rope R to be measured.

[0054] Furthermore, in the example shown in Figure 6, the attachment 65 is detachably attached to the tip of the measuring instrument body 61. Therefore, as shown in Figures 6 and 7, when measuring rope tension without using the moment section 50, a different attachment 70 can be attached to the tip of the measuring instrument body 61. In the example shown in Figures 6 and 7, the attachment 70 is formed in a cylindrical shape overall and extends in the second direction D2. A recess is formed at the base end of the attachment 70 to receive the tip of the measuring instrument body 61.

[0055] As shown in Figure 6, when measuring rope tension without using the moment section 50, the rope R is pressed directly against an attachment 70 attached to the tip of the measuring instrument body 61. The tip of the attachment 70 includes a rope pressing surface 71 against which the rope R is pressed. The rope pressing surface 71 generally faces the second direction D2. The rope pressing surface 71 faces the first rope support section 20 and the second rope support section 40. A groove 72 is formed in the rope pressing surface 71. The groove 72 is recessed from the tip to the base of the attachment 70. The groove 72 extends linearly along the rope pressing surface 71. The attachment 70 is attached to the measuring instrument body 61 such that the groove 72 extends along the first direction D1. The presence of a groove 72 extending along the first direction D1 on the rope pressing surface 71 suppresses the risk of the rope R falling off the attachment 70 during rope tension measurement.

[0056] In the examples shown in Figures 6 and 7, a V-shaped groove 72 is formed in the rope pressing surface 71. More specifically, the cross-section of the groove 72 along the second direction D2 and the third direction D3 is V-shaped. Of course, the shape of the groove 72 formed in the rope pressing surface 71 may be other shapes. For example, the groove 72 may be U-shaped. More specifically, the cross-section of the groove 72 along the second direction D2 and the third direction D3 may be U-shaped. The U-shaped or V-shaped groove 72 allows the attachment 70 to hold ropes of various diameters within the groove 72, preventing them from moving in the third direction D3.

[0057] Furthermore, in the example described above, the first rope support section 20 includes the first roller 21 and the rope support surface 22 rotates, but it is not limited to this. The first rope support section 20 does not have to include the first roller 21, and its rope support surface does not have to rotate relative to the base 10. Also, in the example shown in Figure 8, the first rope support section 20 is formed in a block shape and fixed to the base 10. The surface of the first rope support section 20 facing the moment section 50 in the second direction D2 is the rope support surface 28. The rope support surface 28 is fixed to the base 10. A groove 29 for receiving the rope R may be formed in the rope support surface 28. The groove 29 may extend in the first direction D1. This suppresses the risk of the rope R falling off the first rope support section 20 during rope tension measurement. The shape of the groove 29 may be V-shaped or U-shaped. More specifically, the cross-section of the groove 29 along the second direction D2 and the third direction D3 may be V-shaped or U-shaped. In this case as well, the first rope support portion 20 can hold ropes of various diameters within the groove 29 so that they cannot move in the third direction D3.

[0058] Similarly, in the example described above, the second rope support section 40 includes a roller 41 and the rope support surface 42 rotates, but is not limited to this. The second rope support section 40 does not have to include a roller 41, and its rope support surface does not have to rotate relative to the moving mechanism 31. In the example shown in Figure 9, the second rope support section 40 is formed in a block shape and fixed to the moving section 33 of the moving mechanism 31. The surface of the second rope support section 40 facing the moment section 50 in the second direction D2 is the rope support surface 48. The rope support surface 48 is fixed relative to the moving section 33. A groove 49 for receiving the rope R may be formed in the rope support surface 48. The groove 49 may extend in the first direction D1. This suppresses the risk of the rope R falling off the second rope support section 40 during rope tension measurement. The shape of the groove 49 may be V-shaped or U-shaped. More specifically, the cross-section of the groove 49 along the second direction D2 and the third direction D3 may be V-shaped or U-shaped. In this case as well, the second rope support portion 40 can hold ropes of various diameters within the groove 49 so that they cannot move in the third direction D3.

[0059] According to the above-described embodiment and its modified form, the rope tension measuring device 1 comprises a base 10, a first rope support 20, a second rope support 40, a moving mechanism 31, a measuring instrument 60, and a moment unit 50. The first rope support 20 is attached to the base 10 and supports the side of the rope R to be measured. The second rope support 40 is located at a position spaced apart from the first rope support 20 in a first direction D1 and supports the side of the rope R from the same side as the first rope support 20. The moving mechanism 31 is attached to the base 10 and supports the second rope support 40 and moves it along a second direction D2 that intersects the first direction D1. The measuring instrument 60 is attached to the base 10 between the first rope support 20 and the second rope support 40 in the first direction D1. The measuring instrument 60 has a tip and a sensor 62 capable of measuring the load applied to the tip. The moment section 50 is attached to the base 10 between the first rope support section 20 and the second rope support section 40 in the first direction D1. The moment section 50 is also attached to the base 10 between the first rope support section 20 and the second rope support section 40 and the tip of the measuring instrument 60 in the second direction D2. The moment section 50 has a swinging section 51 and a rope pressing section 55. The swinging section 51 is attached to the base 10 so as to be swingable about a swing rotation axis 53 along a third direction D3 that intersects the first direction D1 and the second direction D2. The rope pressing section 55 protrudes from the swinging section 51 toward the first rope support section 20 and the second rope support section 40 in the second direction D2. The rope R supported by the first rope support section 20 and the second rope support section 40 is pressed against the rope pressing section 55. The measuring instrument 60 is positioned so that its tip faces the oscillating part 51. The distance W2 between the position on the oscillating part 51 facing the tip and the oscillating rotation axis 53 is longer than the distance W1 between the rope pressing part 55 and the oscillating rotation axis 53.

[0060] With this rope tension measuring device 1, it is possible to measure tension greater than the rated output value of the measuring instrument 60 using the measuring instrument 60. Therefore, it is possible to measure the tension of ropes with large diameters. Consequently, there is no need to prepare expensive measuring instruments with high rated output values ​​for ropes with large diameters, and the cost of measuring rope tension can be reduced.

[0061] According to the above-described embodiment and its modified form, the first rope support section 20 has a first roller 21. The first roller 21 is rotatable about a first roller rotation axis 27 along the third direction D3. The second rope support section 40 has a second roller 41. The second roller 41 is rotatable about a second roller rotation axis 47 along the third direction D3.

[0062] With this rope tension measuring device 1, when measuring rope tension, if the sides of the rope R are supported by the outer surfaces 22 and 42 of the rollers 21 and 41, the rollers 21 and 41 rotate as the rope R bends when the second rope support part 40 is moved and the rope R is pressed against the rope pressing part 55. Therefore, friction between the rope support parts 20 and 40 and the rope R can be suppressed, and the rope R can be bent smoothly.

[0063] According to the above-described embodiment and its modified form, the outer circumferential surface 22 of the first roller 21 has a groove 23 extending along the circumferential direction of a circle centered on the first roller rotation axis 27. The outer circumferential surface 42 of the second roller 41 also has a groove 43 extending along the circumferential direction of a circle centered on the second roller rotation axis 47.

[0064] With this rope tension measuring device 1, the risk of the rope R falling off the outer surfaces 22 and 42 of the rollers 21 and 41 when measuring rope tension is suppressed.

[0065] According to the above-described embodiment and its modified form, a groove 57 is formed on the rope pressing surface 56 of the rope pressing portion 55, which is the surface facing the first rope support portion 20 and the second rope support portion 40, extending along the radial direction of a circle centered on the oscillating rotation axis 53.

[0066] With this rope tension measuring device 1, the risk of the rope R falling off the rope pressing surface 56 when measuring rope tension is suppressed.

[0067] According to a modified version of the above-described embodiment, the moment portion 50 is detachably attached to the base portion 10.

[0068] With this rope tension measuring device 1, rope tension can be measured without using the moment section 50, and the tension of ropes with small diameters can be easily measured.

[0069] According to a modified version of the above-described embodiment, the position of the measuring instrument 60 on the base 10 can be changed.

[0070] With this rope tension measuring device 1, the risk of the conditions for measuring rope tension differing significantly between when measuring rope tension using the moment section 50 and when measuring rope tension without using the moment section 50 is suppressed.

[0071] While several embodiments and variations of the present invention have been described, these embodiments and variations are presented as examples only and are not intended to limit the scope of the invention. These novel embodiments and variations can be implemented in a variety of other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. Naturally, these embodiments and variations can also be combined in part as appropriate within the scope of the spirit of the invention. [Explanation of Symbols]

[0072] 1: Rope tension measuring device, 10: Base, 11: Opening, 12a~12d: First opening, 13a~13b: Second opening, 20: First rope support section, 21: First roller, 30: Load section, 31: Moving mechanism, 40: Second rope support section, 41: Second roller, 50: Moment section, 51: Swiveling section, 55: Rope pressing section, 60: Measuring instrument, 61 Measuring instrument body, 65, 70: Attachments, R: Rope

Claims

1. The base and, A first rope support part is attached to the base and supports the side of the rope to be measured, A second rope support portion supports the side of the rope from the same side as the first rope support portion at a position spaced apart in a first direction from the first rope support portion, A moving mechanism attached to the base, which supports the second rope support and moves along a second direction intersecting the first direction, A measuring instrument having a tip and a sensor for measuring the load applied to the tip, which is attached to the base between the first rope support portion and the second rope support portion in the first direction, A moment portion attached to the base between the first rope support portion and the second rope support portion in the first direction, and between the first rope support portion and the second rope support portion and the tip portion of the measuring instrument in the second direction, Equipped with, The moment portion includes a swinging portion attached to the base so as to be swingable about a swing rotation axis along a third direction intersecting the first and second directions, and a rope pressing portion that protrudes from the swinging portion toward the first rope support portion and the second rope support portion in the second direction, and against which the ropes supported by the first rope support portion and the second rope support portion are pressed. The measuring instrument is positioned such that its tip faces the oscillating part. A rope tension measuring device wherein the distance between the position on the oscillating part facing the tip and the oscillating rotation axis is longer than the distance between the rope pressing part and the oscillating rotation axis.

2. The first rope support portion has a first roller that is rotatable about a first roller rotation axis along the third direction, The rope tension measuring device according to claim 1, wherein the second rope support portion has a second roller that is rotatable about a second roller rotation axis along the third direction.

3. The outer circumferential surface of the first roller has grooves extending along the circumferential direction of a circle centered on the rotation axis of the first roller, The rope tension measuring device according to claim 2, wherein the outer circumferential surface of the second roller has a groove extending along the circumferential direction of a circle centered on the rotation axis of the second roller.

4. The cross-section of the groove of the first roller along the radial direction of the circle centered on the rotation axis of the first roller is U-shaped. The rope tension measuring device according to claim 3, wherein the cross-section of the groove of the second roller along the radial direction of the circle centered on the rotation axis of the second roller is U-shaped.

5. The cross-section of the groove of the first roller along the radial direction of the circle centered on the rotation axis of the first roller is V-shaped, The rope tension measuring device according to claim 3, wherein the cross-section of the groove of the second roller along the radial direction of the circle centered on the rotation axis of the second roller is V-shaped.

6. The rope tension measuring device according to claim 1, wherein grooves extending along the radial direction of a circle centered on the pivot rotation axis are formed on the surfaces of the rope pressing portion facing the first rope support portion and the second rope support portion.

7. The rope tension measuring device according to claim 6, wherein the cross-section of the groove of the rope pressing portion along the circumferential direction of a circle centered on the pivot rotation axis is U-shaped or V-shaped.

8. The measuring instrument further comprises an attachment that covers the tip portion, The rope tension measuring device according to claim 1, wherein the end of the attachment facing the side of the swinging part is in contact with the swinging part.

9. The rope tension measuring device according to claim 1, wherein the moment portion is detachably attached to the base portion.

10. The rope tension measuring device according to claim 9, wherein the position of the measuring instrument on the base can be changed.

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