Rope Loading Device

Abstract

To provide a technique for downsizing a rope load applying device that evaluates rope performance.SOLUTION: A rope load applying device 10 comprises a pedestal portion 22, a first motor 36 and a second motor 38 for conveying a rope 20 by unwinding and winding, a first column portion 24 erected on the pedestal portion 22 to support the rope 20 in a transportable manner, a second column portion 26 erected on the pedestal portion 22 to support the rope 20 in a transportable manner, and a spring device 50 provided on the pedestal portion 22 and capable of applying tension to the rope 20. The first motor 36 and the second motor 38 face each other in the rotation axis direction and are arranged between the first column portion 24 and the second column portion 26. The first columnar portion 24 and the second columnar portion 26 are arranged by being displaced in the rotation axis direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an apparatus for applying loads to a rope in order to evaluate the performance of the rope. [Background technology]

[0002] Patent document 1 discloses a slack detection device that is provided with a transmitter that emits light or the like that passes outside the winding position of the lifting rope on the winding drum parallel to the axis of the winding drum, and detects slack in the lifting rope at a position outside the winding position of the lifting rope. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 6-321314 Summary of the Invention [Problem to be solved by the invention]

[0004] In a device that transports a rope by unwinding and winding one end of the rope and applies a load to the rope, an increase in size of the device can be a problem due to the arrangement of a motor that transports the rope, etc.

[0005] An object of the present invention is to provide a technique for miniaturizing a rope load application device for evaluating rope performance. [Means for solving the problem]

[0006] In order to solve the above problems, one aspect of the present invention is a rope load applying device that applies a load to a rope by transporting the rope by unwinding and winding it in order to evaluate the performance of the rope, the device comprising a base, a first motor and a second motor that transport the rope by unwinding and winding it, a first pillar that stands on the base and supports the rope so that it can be transported, a second pillar that stands on the base and supports the rope so that it can be transported, and a spring device that is provided on the base and can apply tension to the rope. The first motor and the second motor face each other in the rotation axis direction and are disposed between the first pillar and the second pillar, and the first pillar and the second pillar are disposed so as to be misaligned in the rotation axis direction. Effect of the Invention

[0007] According to the present invention, a technique for miniaturizing a rope load application device for evaluating rope performance can be provided. [Brief description of the drawings]

[0008] [Figure 1] FIG. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Fig. 1 is a perspective view of the rope load applying device 10. Fig. 2 is a front view of the rope load applying device 10. Fig. 3 is a top view of the rope load applying device 10. The rope load applying device 10 includes a base portion 22, a first pillar portion 24, a second pillar portion 26, a connecting portion 28, a first pulley portion 30, a second pulley portion 32, a third pulley portion 33, a fourth pulley portion 34, a first motor 36, a second motor 38, a first drum 40, a second drum 42, a fifth pulley portion 44, a sixth pulley portion 46, a seventh pulley portion 48, a spring device 50, a rope position detection portion, a temperature sensor, and a load detection portion.

[0010] In order to evaluate the performance of the rope 20, such as the reduction in the breaking strength of the rope 20 and the degree of elongation of the rope 20, the rope load applying device 10 applies a load to the rope 20 by transporting the rope 20 by unwinding and winding it while applying a desired tension to the rope 20. This makes it possible to evaluate the usage limit of the rope 20. The performance evaluation of the rope 20 may be performed by removing it from the rope load applying device 10.

[0011] For example, in an overhead line conveying system that suspends timber cut in a forest from ropes 20 and conveys the timber, a rope 20 of 300 to 2000 meters is used, and a large load is applied to the rope 20. To evaluate the performance of the rope 20 used in the overhead line conveying system, the rope load applying device 10 applies a load to the rope 20 by repeatedly conveying the rope 20 at a desired conveying speed while applying a large tension to the rope 20.

[0012] The base 22 is formed in a rectangular flat plate shape. The first pillar 24 is composed of multiple pillars and beams like a steel tower, and is erected on the base 22. The second pillar 26 is also of the same shape as the first pillar 24, and is erected on the base 22. The first pillar 24 and the second pillar 26 are disposed apart from each other, and their upper ends are connected by a connecting portion 28. The connecting portion 28 is rod-shaped, and increases the strength of the first pillar 24 and the second pillar 26, preventing them from tilting due to the tension of the rope 20.

[0013] A first pulley portion 30 is provided at the upper end of the first pillar portion 24, and a second pulley portion 32 is provided at the upper end of the second pillar portion 26. A third pulley portion 33 is provided at the lower end of the first pillar portion 24, and a fourth pulley portion 34 is provided at the lower end of the second pillar portion 26.

[0014] The fifth pulley section 44 and the sixth pulley section 46 are provided below the spring device 50. The seventh pulley section 48 is provided at an upper end of the spring device 50. The seventh pulley section 48 has a rotation axis direction perpendicular to the first pulley section 30, the second pulley section 32, the third pulley section 33, the fourth pulley section 34, the fifth pulley section 44, and the sixth pulley section 46. Each pulley section is provided rotatably, supports the rope 20 so as to be transportable, and changes the direction of the rope 20.

[0015] The spring device 50, which will be described in detail later, is provided on the base portion 22 and biases the seventh pulley portion 48 upward to apply tension to the rope 20. Below the spring device 50, a space is provided in which the fifth pulley portion 44 and the sixth pulley portion 46 are disposed.

[0016] The first motor 36 is connected to the first drum 40 and can wind and unwind the rope 20 by rotating the first drum 40. The second motor 38 is connected to the second drum 42 and can wind and unwind the rope 20 by rotating the second drum 42. The first motor 36 and the second motor 38 transport the rope 20 by unwinding and winding. One end of the rope 20 is fixed to the first drum 40, and the other end of the rope 20 is fixed to the second drum 42. The first motor 36 and the second motor 38 are provided with their rotation axes parallel to each other and are arranged coaxially.

[0017] 3, the first motor 36 and the second motor 38 face each other in the direction of the rotation axis of the first motor 36 and the second motor 38, and are disposed between the first pillar portion 24 and the second pillar portion 26. This allows the rope load applying device 10 to be made smaller than when the first motor 36 and the second motor 38 are arranged in parallel in a direction perpendicular to the direction of the rotation axis.

[0018] The arrangement of the rope 20 will be described. One end of the rope 20 is fixed to the first drum 40. The rope 20 extends from the first drum 40 to the first pulley section 30, engages with the first pulley section 30, changes direction, and extends downward to the third pulley section 33 as shown in FIG. 2, engages with the third pulley section 33, changes direction, and extends horizontally, and engages with the sixth pulley section 46 as shown in FIG. 3. Furthermore, the rope 20 changes direction at the sixth pulley section 46 and extends upward, engages with the seventh pulley section 48, turns back, and engages with the fifth pulley section 44 below. Furthermore, the rope 20 changes direction horizontally at the fifth pulley section 44, engages with the fourth pulley section 34, changes direction upward, engages with the second pulley section 32, changes direction downward, and is fixed to the second drum 42. In this way, the rope 20 passes from the first drum 40 through each pulley section and is fixed to the second drum 42.

[0019] The first pillar portion 24 and the second pillar portion 26 support the rope 20 so as to be transportable by holding the first pulley portion 30 and the second pulley portion 32 at their upper ends, respectively. The first pillar portion 24 and the second pillar portion 26 are erected on the base portion 22, so that the rope 20 can be extended vertically. This prevents the rope load applying device 10 from becoming longer in the longitudinal direction of the base portion 22, and allows for a compact size. The longitudinal direction is the direction along the long side of the base portion 22. Furthermore, although there is a risk that the rope 20 may tilt due to the tension of the rope 20 due to the first pillar portion 24 and the second pillar portion 26 being erected, the connecting portion 28 makes it difficult for the rope 20 to tilt.

[0020] As shown in FIG. 3, the first pillar portion 24 and the second pillar portion 26 are arranged with a positional deviation in the direction of the rotation axis of the first motor 36 and the second motor 38. The first drum 40 and the second drum 42 are also arranged with a positional deviation in the direction of the rotation axis of the first motor 36 and the second motor 38. The direction of the rotation axis of the first motor 36 and the second motor 38 is the same as the direction of the rotation axis of the first pulley portion 30, the second pulley portion 32, the third pulley portion 33, and the fourth pulley portion 34. As a result, the rope 20 extending from the first pillar portion 24 and the rope 20 extending from the second pillar portion 26 are arranged in parallel so as to be folded back at the seventh pulley portion 48, and the rope load applying device 10 can be made small in the longitudinal direction. By making the rope load applying device 10 small, the rope load applying device 10 can be manufactured at low cost. The amount of misalignment in the rotation axis direction between the first pillar portion 24 and the second pillar portion 26 is set in accordance with the diameter of the seventh pulley portion 48.

[0021] The rope load applying device 10 further includes a control unit (not shown) that controls the first motor 36 and the second motor 38, and the control unit controls the driving of the first motor 36 and the second motor 38 so as to transport the rope 20 at a set speed. The rope load applying device 10 fixes an end of one rope 20 to a first drum 40 and a second drum 42, and transports the rope 20 by unwinding one of the first motor 36 and the second motor 38 and winding the other. When the rope 20 has been transported a predetermined distance, the first motor 36 and the second motor 38 are rotated in the reverse direction to transport the rope 20 in the reverse direction. The transport and reverse transport of the rope 20 are repeated many times to apply a load to the rope 20, and the durability of the rope 20 can be inspected.

[0022] Fig. 4 is a perspective view of the spring device 50. In addition to the spring device 50, a rope position detection unit 52, a temperature sensor 54, and a load detection unit 56 are also shown in Fig. 4.

[0023] The spring device 50 has a plurality of coil springs 51, a base portion 58, a first plate portion 60, a second plate portion 62, and a plurality of suspension portions 64. The plurality of coil springs 51 are arranged in parallel on the base portion 58 and bias the first plate portion 60 upward. The plurality of coil springs 51 are arranged to be sandwiched between the base portion 58 and the first plate portion 60. The second plate portion 62 is arranged to be overlapped above the first plate portion 60. The second plate portion 62 is provided with a seventh pulley portion 48. The plurality of suspension portions 64 connect the first plate portion 60 and the second plate portion 62. The suspension portion 64 has a piston structure, and the distance between the first plate portion 60 and the second plate portion 62 may be adjustable.

[0024] The multiple coil springs 51 urge the seventh pulley portion 48 upward, thereby applying tension to the rope 20 engaged with the seventh pulley portion 48. The spring device 50 can prevent the rope 20 from stretching and reducing its tension. For example, when the first motor 36 and the second motor 38 are rotated in the opposite directions to switch the conveying direction of the rope 20, if the rope 20 tends to slacken due to missynchronization of the first motor 36 and the second motor 38, the spring device 50 can apply tension to the rope 20 to prevent the rope 20 from slackening.

[0025] The load detection unit 56 is disposed between the first plate portion 60 and the second plate portion 62, and detects the load applied to the spring device 50. This makes it possible to calculate the tension of the rope 20, and by transporting the rope 20 while monitoring the tension of the rope 20, the load applied to the rope 20 can be grasped.

[0026] The rope position detection unit 52 detects a marker that is provided in advance at a predetermined position on the rope 20. This makes it possible to grasp the conveying distance of the rope 20 and detect the timing to switch the conveyance of the rope 20 to the reverse direction at a predetermined distance. The control unit switches the rotation of the first motor 36 and the second motor 38 based on the detection result of the rope position detection unit 52.

[0027] The temperature sensor 54 is located near the rope 20 and detects the temperature of the rope 20. This allows the control unit to stop the transport of the rope 20 when the temperature of the rope 20 becomes too high.

[0028] The present invention has been described above based on the embodiments. The embodiments are merely examples, and it will be understood by those skilled in the art that various modifications are possible in the combination of each component and each processing step, and that such modifications are also within the scope of the present invention. [Explanation of symbols]

[0029] 10 rope load applying device, 20 rope, 22 base portion, 24 first column portion, 26 second column portion, 28 connecting portion, 30 first pulley portion, 32 second pulley portion, 33 third pulley portion, 34 fourth pulley portion, 36 first motor, 38 second motor, 40 first drum, 42 second drum, 44 fifth pulley portion, 46 sixth pulley portion, 48 seventh pulley portion, 50 spring device, 51 coil spring, 52 rope position detection portion, 54 temperature sensor, 56 load detection portion, 58 base portion, 60 first plate portion, 62 second plate portion, 64 suspension portion.

Claims

[Claim 1] A rope load applying device for evaluating the performance of a rope by conveying the rope by unwinding and winding, the rope being loaded, A base portion and A first motor and a second motor for transporting the rope by unwinding and winding it; A first pillar portion that is erected on the base portion and supports the rope so as to be transportable; A second pillar portion that is erected on the base portion and supports the rope so as to be transportable; A spring device provided on the base portion and capable of applying tension to the rope, the first motor and the second motor face each other in a rotation axis direction and are disposed between the first pillar portion and the second pillar portion, The rope load applying device, characterized in that the first pillar portion and the second pillar portion are arranged with a positional deviation in the rotation axis direction.

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