JP2018052629A - Rope feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rope feeding device that can stably feed a rope with a reduced working space required for operation and can restrain irregular winding of rope.SOLUTION: A rope feeding device 1 comprises a spool drum 20, an idler sheave part 3, and a brake drum 40. The idler sheave part 3 comprises a first idler sheave 31 and a second idler sheave 32. The wire rope 5 wound on the spool drum 20 is fed toward another winch from the brake drum 4 via the idler sheave part 3. The axial positions of the first idler sheave 31 and the second idler sheave 32 can be changed in accordance with change of the feeding position of the wire rope 5 associated with the rotation of the spool drum 20.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a rope unwinding device for unwinding a rope to wind the rope around a winch or the like of a work machine.

  Conventionally, a mobile crane including a lower traveling body, an upper swing body, a boom, and a winch is known as a work machine. The boom is attached to the front part of the upper swing body. The winch lifts and unloads the rope suspended from the tip of the boom, whereby the suspended load connected to the rope is lifted. In order to wind a rope around such a winch at an assembly stage of a crane or the like, there is known a rope feeding device that sequentially feeds a rope wound on a predetermined drum toward the winch. As the winch drum of the winch is driven to rotate while the rope unwinding device unwinds the rope, the rope is wound on the outer periphery of the winch drum.

  Patent Document 1 discloses a rope feeding device including a wooden spool drum and a control drum. The control drum is disposed between the spool drum and the crane winch. The rope drawn from the spool drum is wound up by the winch while being given a predetermined tension by the control drum. The application of the tension makes it possible to prevent the occurrence of random winding of the rope on the winch.

  Patent Document 2 discloses an apparatus that includes an inner cylinder and an outer cylinder and generates a tension load on the rope. A spiral groove is formed on the inner peripheral surface of the inner cylinder. The outer cylinder is fixed to the apparatus main body, and the inner cylinder is driven to rotate within the outer cylinder. The rope drawn out from the spool drum goes around the outer periphery of the inner cylinder, and is then wound up by a winch of a crane or the like through a discharge port opened between the inner cylinder and the outer cylinder.

Japanese Patent No. 3631519 Japanese Patent No. 4030024

  In the techniques described in Patent Documents 1 and 2, the spool drum is placed vertically so that the drum shaft extends in the vertical direction. In this case, the rope easily falls when the rope wound around the spool drum is pulled out. Further, since the pulling position of the rope of the spool drum moves up and down, there is a problem that the structure of the rope feeding device is complicated in order to keep the rope at a predetermined height.

  On the other hand, when the spool drum is placed horizontally such that the drum shaft extends in the horizontal direction, a fleet angle (rope pulling angle) between the spool drum and the tension applying drum tends to be a problem. If the fleet angle is too large, the rope will not be pulled out properly, and the winch will be caught incorrectly. For this reason, conventionally, when the spool drum is placed horizontally, it has been necessary to set a large distance between the spool drum and the tension applying drum and to reduce the fleet angle. In this case, the rope feeding device becomes large and the work space increases.

  The present invention has been made in view of the above-described problem, and is capable of stably feeding a rope while reducing a space necessary for work, and capable of suppressing random winding of the rope. An object is to provide a feeding device.

  A rope feeding device according to one aspect of the present invention is a rope feeding device that feeds out a rope while applying tension toward a winch drum capable of winding the rope, and has a cylindrical outer peripheral surface. A spool drum that includes a body portion on which the rope is wound on a surface, is arranged so that an axial center of the cylindrical outer peripheral surface extends along a horizontal direction, and feeds the rope by rotating around the axial center And a tension applying drum that is disposed between the spool drum and the winch drum, and applies tension to the rope by contacting the rope fed from the spool drum at a specific contact position, and A guide portion that is disposed between a spool drum and the tension applying drum and guides the rope fed out from the spool drum, The guide portion includes a first idler sheave having a first circumferential surface on which the rope drawn out from the spool drum is hooked, an axial direction in which the first idler sheave is rotatable and parallel to the axis of the spool drum A first support portion movably supported along the first idler sheave, a second idler sheave having a second peripheral surface on which the rope that has passed through the first peripheral surface of the first idler sheave is hung, and the second idler sheave A first support sheave and a second idler sheave as viewed from a direction parallel to the shaft center of the spool drum. Respectively support the rope so that the rope comes into contact with the surfaces of the regions on the opposite sides of the first peripheral surface and the second peripheral surface, and the first support portion and And the second support portion is configured such that the first idler sheave and the second idler sheave are arranged in the spool in response to a change in the feeding position of the rope in the axial direction on the spool drum as the spool drum rotates. The first idler sheave and the second idler sheave are supported so as to move relative to the drum and the tension applying drum along the axial direction.

  According to this configuration, the guide portion including the first and second idler sheaves is disposed between the spool drum and the tension applying drum. The first and second idler sheaves support the rope so that the rope contacts the opposite surfaces. In other words, the rope is zigzag hung on the first idler sheave and the second idler sheave. Therefore, the rope is bridged between the first idler sheave and the second idler sheave so that the rope intersects with the arrangement direction of the spool drum and the tension applying drum. For this reason, the fleet angle of the rope between the spool drum and the tension applying drum can be reduced as compared with the case where the rope is directly bridged from the spool drum to the tension applying drum. In other words, it is possible to reduce the size of the rope feeding device while maintaining the same fleet angle as when the rope is directly bridged from the spool drum to the tension applying drum. Further, each idler sheave of the guide portion can move in the axial direction in accordance with a change in the rope feeding position in the spool drum. Therefore, the fleet angle of the rope is prevented from becoming significantly large due to a change in the feeding position on the spool drum side. Furthermore, since the spool drum is in the horizontal posture, the rope feeding position does not move up and down, and the rope can be fed stably. Further, the rope is prevented from dropping from the peripheral surface of the spool drum during standby.

  In the above configuration, when viewed from a direction parallel to the axis of the spool drum, the first idler sheave and the second idler sheave are mutually opposite in a direction orthogonal to the arrangement direction of the spool drum and the tension applying drum. It is desirable that it is shifted.

  According to this configuration, the rope is bridged between the first idler sheave and the second idler sheave so that the rope intersects at a larger angle with respect to the arrangement direction of the spool drum and the tension applying drum. For this reason, the fleet angle of the rope between the spool drum and the tension applying drum can be further reduced as compared with the case where the rope is directly bridged from the spool drum to the tension applying drum.

  In the above configuration, it is preferable that the first idler sheave is disposed at a position closer to the tension applying drum than the second idler sheave.

  According to this configuration, a region where the rope is folded back to the spool drum side is partially formed between the first idler sheave and the second idler sheave. As a result, the fleet angle of the rope can be further reduced by at least the folding area.

  In the above configuration, the first idler sheave is disposed above the second idler sheave, and the rope is hung so as to contact at least an upper end portion of the first peripheral surface of the first idler sheave. It is desirable that

  According to this configuration, the fleet angle of the rope can be reduced by at least the height difference between the first idler sheave and the second idler sheave below the first idler sheave.

  In the above configuration, the spool drum rotates along a rotation direction such that the peripheral surface of the spool drum moves from the upper side to the lower side in a region facing the guide portion, and the rope feeding position on the spool drum. However, it is desirable that it is disposed on the upper end side of the body portion.

  According to this configuration, interference between the rope and the second idler sheave located below the rope can be suppressed between the spool drum and the first idler sheave.

  In the above configuration, the first idler sheave is disposed below the second idler sheave, and the rope is hung so as to contact at least a lower end portion of the first peripheral surface of the first idler sheave. It is desirable that

  According to this configuration, the fleet angle of the rope can be reduced by at least the difference in height between the first idler sheave and the second idler sheave above the first idler sheave.

  In the above configuration, the spool drum rotates along a rotation direction such that the peripheral surface of the spool drum moves from below to above in a region facing the guide portion, and the rope feeding position on the spool drum However, it is desirable to arrange | position at the lower end side of the said trunk | drum.

  According to this configuration, interference between the rope and the second idler sheave located above the rope can be suppressed between the spool drum and the first idler sheave.

  In the above configuration, the spool drum, the guide portion, and the tension applying drum are arranged so that the spool drum, the guide portion, and the tension applying drum are integrally mounted on a vehicle body of a predetermined moving vehicle and are movable. It is desirable to further have a supporting base.

  According to this configuration, the rope feeding device can be easily moved to the work site of the work machine.

  In the above configuration, the apparatus further includes a drive mechanism for rotating the spool drum around the axis so that the rope fed out from the winch drum can be wound around the spool drum via the guide portion. It is desirable.

  According to this configuration, the rope can be wound around the spool drum using the rope feeding device.

  ADVANTAGE OF THE INVENTION According to this invention, while reducing the space required for an operation | work, while being able to pay out a rope stably, the rope feeding apparatus which can suppress a random winding of a rope is provided.

It is a side view of a rope feeding device and a crane concerning one embodiment of the present invention. It is a top view of the rope feeding apparatus which concerns on one Embodiment of this invention. It is a side view of the rope feeding apparatus which concerns on one Embodiment of this invention. It is a schematic diagram for demonstrating the fleet angle between a spool drum and a tension | tensile_strength provision drum. It is a side view of the rope feeding apparatus which concerns on the deformation | transformation embodiment of this invention. It is a side view of the rope feeding apparatus which concerns on the deformation | transformation embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a rope feeding device 1 and a crane 10 according to an embodiment of the present invention. In the following, in each figure, directions of “up”, “down”, “front”, and “rear” are shown, and these directions indicate the structure and function of the rope feeding device 1 according to the present invention. It is shown for the sake of explanation, and does not limit the usage mode of the rope feeding device 1.

  The rope feeding device 1 has a function of feeding a rope while applying a predetermined tension to a work machine such as a crane 10. As shown in FIG. 1, the rope feeding device 1 is disposed on the ground G so as to face the crane 10. Below, the structure of the crane 10 shown by FIG. 1 is demonstrated.

  The crane 10 includes an upper swing body 12 corresponding to a crane main body, a lower traveling body 11 that supports the upper swing body 12 in a swingable manner, and a hoisting member including a boom and a jib. The boom is supported by the upper swing body 12 so as to be raised and lowered, and the jib is supported at the tip of the boom so as to be raised and lowered. In FIG. 1, a lower boom 13 that constitutes the lower end of the boom is attached to the upper swing body 12. The rotation center axis of the jib is a horizontal axis parallel to the rotation center axis of the boom (lower boom 13) with respect to the upper swing body 12.

  Furthermore, the crane 10 includes a mast 15 that is a boom hoisting member and a counterweight 16 for adjusting the balance of the crane 10. A cab 14 is provided at the front end of the upper swing body 12. The cab 14 corresponds to a driver seat of the crane 10.

  Various winches (winch drums) are mounted on the crane 10. As shown in FIG. 1, a jib hoisting winch 19 for rotating the jib in the hoisting direction, a main winding winch 18 and an auxiliary winding winch 17 for lifting and lowering a suspended load, Mounted on the boom 13. Although not shown in FIG. 1, a boom hoisting winch (not shown) for raising and lowering the boom is also mounted on the upper swing body 12. Each of the auxiliary winding winch 17, the main winding winch 18, and the jib hoisting winch 19 includes a winch drum capable of winding and unwinding a rope. Further, winch drums exemplified by the jib hoisting winch 19, the main winding winch 18 and the auxiliary winding winch 17 may be mounted on the upper swing body 12.

  In addition, the structure of said crane 10 does not limit the structure of the rope feeding apparatus 1 which concerns on this embodiment, a function, a usage condition, etc. In the assembly work of the crane 10, an operation of winding a rope around a winch drum represented by the jib hoisting winch 19 occurs. When the rope of the jib hoisting winch 19 is damaged, it is necessary to pull out the rope from the jib hoisting winch 19 and wind a new rope. In such a work, in order to prevent random winding from occurring on the rope wound on the jib hoisting winch 19, the rope is attached to the rotating jib hoisting winch 19 while applying a predetermined tension to the rope. Need to pay out. Below, the structure of the rope feeding apparatus 1 provided with such a function is explained in full detail. 2 and 3 are a top view and a side view of the rope feeding device 1 according to the present embodiment.

  The rope feeding device 1 includes a spool drum portion 2, an idler sheave portion 3 (guide portion), a brake drum portion 4, a base 1S, and an anchor 1A. The base 1S is made of a plate material that supports the spool drum portion 2, the idler sheave portion 3, and the brake drum portion 4. As shown in FIG. 1, the anchor 1 </ b> A is disposed in front of the pedestal 1 </ b> S with an interval. The anchor 1 </ b> A is a weight for preventing the rope feeding device 1 from moving due to the winding force of the jib hoisting winch 19. In addition, as shown in FIG. 1, the arrow DK direction which goes to the winch 19 for jib hoisting from the rope feeding apparatus 1 is defined as the feeding direction of the wire rope 5 (rope). Further, when the jib hoisting winch 19 is rotated and the wire rope 5 is wound around the jib hoisting winch 19, the angle of the wire rope 5 is adjusted by a predetermined sheave 100 as shown in FIG. When the wire rope 5 is wound around the auxiliary winding winch 17 and the main winding winch 18, the position of the sheave 100 is moved.

  The spool drum portion 2 is disposed at the front end portion of the base 1S. The spool drum portion 2 includes a spool drum 20, a pair of spool drum support portions 2S, and a spool drum rotating machine 2M.

  The spool drum 20 has a cylindrical outer peripheral surface, and a drum body portion 21 (body portion) around which the wire rope 5 is wound, and a pair of flanges 22 arranged at both ends of the drum body portion 21. With. The spool drum 20 is disposed so that the axis of the cylindrical outer peripheral surface of the drum body 21 extends along the horizontal direction, and the wire rope 5 is fed out by rotating around the axis of the drum body 21. The spool drum 20 can be attached to and detached from the spool drum support portion 2S of the rope feeding device 1. In addition, the wire rope 5 wound on the drum trunk | drum 21 of the spool drum 20 is wound in order along the axial direction (left-right direction of FIG. 2). For this reason, when the wire rope 5 is fed out while the spool drum 20 is rotated, the feeding position of the wire rope 5 on the spool drum 20 reciprocates along the axial direction.

  The pair of spool drum support portions 2S includes a pair of wall portions disposed on the pedestal 1S. The spool drum support portion 2S supports the spool drum 20 in a rotatable manner. The spool drum rotating machine 2M is an electric motor including a spool drum rotating shaft 2T. The spool drum rotation shaft 2 </ b> T serves as an axis for the rotation of the spool drum 20. The spool drum rotating machine 2M rotates the spool drum 20 during the operation of winding the wire rope 5 around the spool drum 20. When the wire rope 5 is pulled out from the spool drum 20 by the winding force of the jib hoisting winch 19 of the crane 10, the spool drum rotating machine 2M does not generate a driving force. In addition, when the wire rope 5 on the spool drum 20 decreases as the wire rope 5 is pulled out, the spool drum 20 may rotate more than necessary due to rotational inertia. For this reason, in order to regulate the rotation of the spool drum 20, the spool drum rotating machine 2M may generate a driving force as needed to control the rotation of the spool drum 20. In this case, it is desirable that the spool drum 20 is rotated at a rotation speed slower than the drawing speed of the wire rope 5.

  When the spool drum 20 is mounted on the spool drum support 2S, the spool drum rotating shaft 2T extending from the spool drum rotating machine 2M is inserted into and engaged with a shaft hole (not shown) opened at the center of the flange 22. .

  The idler sheave portion 3 is disposed between the spool drum 20 and the brake drum 40 in the front-rear direction. The idler sheave portion 3 has a function of guiding the wire rope 5 fed out from the spool drum 20.

  The idler sheave portion 3 includes a first shaft 31T (first support portion), a second shaft 32T (second support portion), a first idler sheave 31, a second idler sheave 32, and a frame 3S. .

  The first shaft 31 </ b> T is a cylindrical shaft extending along an axial direction parallel to the axial center of the spool drum 20. The second shaft 32T is a columnar shaft that extends in parallel with the first shaft 31T in front of and below the first shaft 31T. The frame 3S supports the first shaft 31T and the second shaft 32T.

  The first idler sheave 31 includes a first peripheral surface 31H on which the wire rope 5 fed from the spool drum 20 is hung, and is rotatably supported by the first shaft 31T. Further, the second idler sheave 32 is arranged at a position shifted from the first idler sheave 31 in the vertical direction. The second idler sheave 32 includes a second peripheral surface 32H on which the wire rope 5 that has passed through the first peripheral surface 31H of the first idler sheave 31 is hung, and is rotatably supported by the second shaft 32T. Furthermore, in the present embodiment, from the state shown in FIG. 2, the first idler sheave 31 and the second idler sheave 32 can slide in the axial direction (left-right direction) on the first shaft 31T and the second shaft 32T, respectively. Has been. The support structure of the first idler sheave 31 and the second idler sheave 32 is not limited to the form of the first shaft 31T and the second shaft 32T. It suffices if the first idler sheave 31 and the second idler sheave 32 are rotatable and movable in the axial direction.

  2 and 3, the first idler sheave 31 is disposed closer to the brake drum 40 than the second idler sheave 32. Specifically, as shown in FIG. 3, the first idler sheave 31 is more than the second idler sheave 32 in the direction in which the spool drum 20 and the brake drum 40 are aligned as viewed from the direction parallel to the axis of the spool drum 20. Is also arranged at a position close to the brake drum 40. Further, as shown in FIG. 3, the first idler sheave 31 and the second idler sheave 32 are arranged at positions shifted from each other in a direction orthogonal to the arrangement direction of the spool drum 20 and the tension applying drum 40. In particular, the first idler sheave 31 is disposed above the second idler sheave 32. The arrangement direction of the spool drum 20 and the tension applying drum 40 is also referred to as a direction connecting the axis of the spool drum 20 and the axis of the brake drum 40. In other words, the first idler sheave 31 and the second idler sheave 32 are arranged at positions shifted from each other in the direction orthogonal to the virtual stretching direction of the wire rope 5 between the spool drum 20 and the tension applying drum 40. . Here, the virtual stretching direction of the wire rope 5 is a direction connecting the feeding position P (FIG. 3) of the wire rope 5 on the spool drum 20 and the contact position of the wire rope 5 on the brake drum 40.

  Referring to FIG. 3, the first idler sheave 31 is opposite to the second idler sheave 32 in the first circumferential surface 31 </ b> H (FIG. 2) when viewed from a direction parallel to the axis of the spool drum 20. The wire rope 5 is supported so that the wire rope 5 comes into contact with the surface of the side region, and the second idler sheave 32 is a region on the opposite side of the first idler sheave 31 in the second peripheral surface 32H (FIG. 2). The wire rope 5 is supported so that the wire rope 5 is in contact with the surface. That is, the wire rope 5 is hung on the first idler sheave 31 and the second idler sheave 32 in a zigzag manner. In particular, the wire rope 5 is hung from the upper end portion toward the lower end portion on the brake drum 40 side of the first peripheral surface 31H of the first idler sheave 31. The wire rope 5 is hung from the upper end portion toward the lower end portion on the spool drum 20 side of the first peripheral surface 32H of the second idler sheave 32.

  The brake drum portion 4 is disposed at the rear end portion of the base 1S. The brake drum unit 4 includes a brake drum 40 (tension applying drum), a pair of brake drum support units 40S, and a brake drum rotating machine 41.

  The brake drum 40 is disposed between the spool drum 20 and the jib hoisting winch 19. In other words, the brake drum 40 is disposed on the downstream side of the spool drum 20 in the feeding direction of the wire rope 5 from the rope feeding device 1 to the jib hoisting winch 19 (arrow DK in FIGS. 1 and 2). The brake drum 40 is formed on a cylindrical peripheral surface 40H that supports a part of the wire rope 5 fed out from the spool drum 20 and a wire rope 5 stretched between the peripheral surface 40H and the jib hoisting winch 19. A tension applying mechanism for applying tension.

  The brake drum 40 applies tension to the wire rope 5 by contacting the wire rope 5 at a specific position on the circumferential surface 40H. In the present embodiment, the tension applying mechanism is a known disc brake disposed in the brake drum rotating machine 41. That is, a predetermined braking force is applied to the brake drum 40 against the winding force of the jib hoisting winch 19 so that a tension is applied to the wire rope 5 stretched between them. The brake drum 40 is rotated around an axis extending in the horizontal direction and parallel to the axis of the spool drum 20, and feeds the wire rope 5 to the jib hoisting winch 19. As shown in FIG. 2, the outer diameter of the peripheral surface 40H of the brake drum 40 continuously increases from the central portion in the axial direction toward both outer sides. The wire rope 5 is pulled out from the brake drum 40 after moving to the central portion in the axial direction of the peripheral surface 40H as the brake drum 40 rotates.

  FIG. 4 is a schematic diagram for explaining the fleet angle θ between the spool drum 20 and the brake drum 40. FIG. 4 shows spool drums 20X and 20Y compared with the spool drum portion 2 according to the present embodiment. The spool drums 20X and 20Y extend the wire ropes 5X and 5Y directly to the brake drum 40 without passing through the first idler sheave 31 and the second idler sheave 32 according to the present embodiment.

  When the wire rope 5 is transferred between the two rotators, the fleet angle θ is determined by the center L of one rotator (brake drum 40), the center line L, and the other rotator (spool drum). This corresponds to an angle formed by a straight line connecting the end portions in the axial direction. If the fleet angle is too large, the wire rope is not properly delivered and wound, and turbulence occurs.

  In FIG. 4, the fleet angle of the spool drum 20X is indicated by θX. If the spool drum 20X is moved to the position of the spool drum 20Y for the purpose of reducing the size of the rope feeding device 1 in the front-rear direction, the fleet angle of the spool drum 20Y becomes θY, which is larger than θX. Therefore, the wire rope 5Y is more likely to generate turbulence than the wire rope 5X.

  Such a fleet angle problem also occurs between the brake drum 40 and the jib hoisting winch 19. For this reason, as shown in FIG. 1, a sufficient distance is provided between the rope feeding device 1 and the jib hoisting winch 19.

  In this embodiment, in order to reduce the size of the rope unwinding device 1, in other words, the space required for the unwinding operation of the wire rope 5, while suppressing the occurrence of the turbulent winding of the wire rope 5 as described above. The feeding device 1 includes an idler sheave portion 3.

  Referring to FIG. 3, when the tip of the wire rope 5 is fixed to the jib hoisting winch 19 (FIG. 1) and the winding of the jib hoisting winch 19 is started, the spool drum 20, the first idler sheave 31, The second idler sheave 32 and the brake drum 40 rotate in the direction indicated by the arrow in FIG. In the spool drum portion 2, the spool drum 20 rotates along the rotation direction such that the peripheral surface of the spool drum 20 moves downward from the region facing the idler sheave portion 3. The feeding position of the wire rope 5 on the spool drum 20 is arranged on the upper end side of the drum body 21. The wire rope 5 is guided rearward from the spool drum 20. Further, after the wire rope 5 is folded forward by the first idler sheave 31, the wire rope 5 is guided rearward again by the second idler sheave 32, and a predetermined tension is applied to the brake drum 40.

  2 and 4, in the present embodiment, the first idler sheave 31 and the second idler sheave 32 are slidable along the axial direction. Therefore, the position of the first idler sheave 31 and the second idler sheave 32 in the axial direction changes according to the change in the feeding position P of the wire rope 5 in the axial direction accompanying the rotation of the spool drum 20. Specifically, the first idler depends on the balance between the tension of the wire rope 5 between the spool drum 20 and the first idler sheave 31 and the tension of the wire rope 5 between the first idler sheave 31 and the second idler sheave 32. The position of the sheave 31 in the axial direction is determined. Similarly, the balance between the tension of the wire rope 5 between the first idler sheave 31 and the second idler sheave 32 and the tension of the wire rope 5 between the second idler sheave 32 and the brake drum 40 causes the second The position of the idler sheave 32 in the axial direction is determined.

  As a result, in FIG. 4, the fleet angle θ of the wire rope 5 guided by the first idler sheave 31 and the second idler sheave 32 between the brake drum 40 and the spool drum 20 is smaller than θX. In FIG. 4, the wire rope 5 between the first idler sheave 31 and the spool drum 20 and the wire rope 5X between the brake drum 40 and the spool drum 20X are parallel to each other. That is, this embodiment corresponds to a configuration in which a part of the wire rope 5X extending from the spool drum 20X in FIG. 4 is partially folded from the second idler sheave 32 to the first idler sheave 31.

  In FIG. 2, when the feeding position P of the wire rope 5 on the spool drum 20 moves as indicated by an arrow DH, the first idler sheave 31 and the second idler sheave 32 are changed according to the tension balance of the wire rope 5. It moves relative to the spool drum 20 and the brake drum 40 along the axial direction. Therefore, the wire rope 5 is stably fed out while the fleet angle of the wire rope 5 between the spool drum 20 and the brake drum 40 is always kept small. In other words, the fleet angle is prevented from becoming significantly large due to the change in the feeding position of the wire rope 5. As a result, the random winding of the wire rope 5 in the brake drum 40 is suppressed. Further, in the present embodiment, the spool drum 20 and the brake drum are compared with the case where the rope is directly bridged from the spool drum 20X to the brake drum 40 as in the rope feeding device on which the spool drum 20X of FIG. 4 is mounted. The fleet angle θ of the wire rope 5 with respect to 40 can be reduced. In other words, it is possible to reduce the size (size in the front-rear direction) of the rope feeding device 1 while maintaining the same fleet angle θ as when the wire rope 5 is directly bridged from the spool drum 20 to the brake drum 40. Become.

  Further, in the present embodiment, the spool drum 20 is placed horizontally so that the axis of the spool drum 20 is along the horizontal direction. For this reason, the feeding position P of the wire rope 5 does not move up and down unlike the case where the spool drum 20 is placed vertically so that the axis of the spool drum 20 is along the vertical direction. Therefore, the wire rope 5 can be stably fed from the spool drum 20 to the first idler sheave 31. In addition, as in the case of vertical installation, the wire rope 5 is prevented from dropping from the peripheral surface of the spool drum 20 due to gravity during standby.

  In the present embodiment, the first idler sheave 31 and the second idler sheave 32 are arranged at different positions in the vertical direction. For this reason, the wire rope 5 is bridged between the first idler sheave 31 and the second idler sheave 32 so that the height of the wire rope 5 changes. As a result, the fleet angle θ of the wire rope 5 between the spool drum 20 and the brake drum 40 can be reduced as compared with the case where the wire rope 5 is directly bridged from the spool drum 20 to the brake drum 40.

  Further, in the present embodiment, the first idler sheave 31 is disposed at a position closer to the brake drum 40 than the second idler sheave 32. In this case, the wire rope 5 is bridged from the first idler sheave 31 to the second idler sheave 32 toward the upstream side in the feeding direction. Therefore, a region 5 </ b> A (FIG. 3) where the wire rope 5 is folded back upstream in the feeding direction is partially formed between the spool drum 20 and the brake drum 40. As a result, the fleet angle θ of the wire rope 5 can be reduced by at least the folding region.

  Further, in the present embodiment, the spool drum 20 rotates along the rotation direction in which the peripheral surface of the spool drum 20 moves from the upper side to the lower side in the region facing the idler sheave portion 3 (FIG. 3). Further, the feeding position of the wire rope 5 on the spool drum 20 is arranged on the upper end side of the drum body 21. For this reason, interference between the wire rope 5 and the second idler sheave 32 positioned below the wire rope 5 can be suppressed between the spool drum 20 and the first idler sheave 31.

  Further, in the present embodiment, the pedestal 1 </ b> S supports the spool drum portion 2 including the spool drum 20, the idler sheave portion 3, and the brake drum portion 4 including the brake drum 40. For this reason, the spool drum 20, the idler sheave part 3, and the brake drum 40 are integrally mounted on a loading platform (vehicle body) of a predetermined track (moving vehicle) and are movable. Therefore, the rope feeding device 1S can be easily moved to the work site of the crane 10 (work machine).

  In the present embodiment, the spool drum rotating machine 2M (FIG. 2) connected to the spool drum 20 can rotate the spool drum 20 along the direction opposite to the arrow in FIG. For this reason, the wire rope 5 fed out from the jib hoisting winch 19 (FIG. 1) can be wound around the spool drum 20 via the idler sheave portion 3. As a result, the old wire rope 5 used in the jib hoisting winch 19 can be wound around the spool drum 20 by using the rope feeding device 1.

  The rope feeding device 1 according to the embodiment of the present invention has been described above. The present invention is not limited to these forms. The present invention can take, for example, the following modified embodiments.

  (1) In the above embodiment, the first idler sheave 31 has been described as being disposed above the second idler sheave 32. However, the present invention is not limited to this. FIG. 5 is a side view of a rope feeding device 1P according to a modified embodiment of the present invention. The rope payout device 1P includes an idler sheave portion 3P in addition to the spool drum portion 2 and the brake drum portion 4 similar to the rope payout device 1. The idler sheave portion 3P includes a first idler sheave 31P and a second idler sheave 32P. As shown in FIG. 5, the first idler sheave 31P is arranged below the second idler sheave 32P. Further, in FIG. 5, the spool drum 20 rotates along the rotation direction such that the peripheral surface of the spool drum 20 moves from the lower side to the upper side in the region facing the idler sheave portion 3P. The feeding position of the wire rope 5 </ b> P on the spool drum 20 is disposed on the lower end side of the drum body 21.

  Even in such a configuration, when the feeding position P of the wire rope 5P on the spool drum 20 moves along the axial direction, the first idler sheave 31P and the second idler sheave 32P according to the balance of the tension of the wire rope 5P. The position in the axial direction moves. Accordingly, the wire rope 5P is stably fed out while the fleet angle of the wire rope 5P between the spool drum 20 and the brake drum 40 is always kept small. Further, the size of the rope feeding device 1P in the front-rear direction can be reduced without increasing the fleet angle of the wire rope 5P.

  In the configuration shown in FIG. 5, a sufficient gap is formed between the spool drum 20 and the first idler sheave 31P along the vertical direction between the wire rope 5P and the second idler sheave 32P. Accordingly, interference between the wire rope 5P and the second idler sheave 32P located above the wire rope 5P can be suppressed between the spool drum 20 and the first idler sheave 31P. On the other hand, in FIG. 5, when the rope feeding position is arranged on the upper end side as in the case of the wire rope 5R and the spool drum 20 is rotated in the reverse direction, when the wire rope 5R is loosened, the wire rope 5R There is a possibility of interfering with the second idler sheave 32P. Accordingly, when the rope feeding position is disposed on the upper end side of the drum body portion 21, it is desirable that the first idler sheave 31 is disposed above the second idler sheave 32 as in the previous embodiment. (Figure 3).

  (2) In the above embodiment, the first idler sheave 21 is described as being disposed closer to the brake drum 40 than the second idler sheave 32. However, the present invention is not limited to this. FIG. 6 is a side view of a rope feeding device 1Q according to another modified embodiment of the present invention. The rope payout device 1Q includes an idler sheave portion 3Q in addition to the spool drum portion 2 and the brake drum portion 4 similar to the rope payout device 1. The idler sheave unit 3Q includes a first idler sheave 31Q and a second idler sheave 32Q. As shown in FIG. 6, the first idler sheave 31Q is disposed above the second idler sheave 32Q. Further, in FIG. 6, the first idler sheave 31Q is disposed closer to the spool drum 20 than the second idler sheave 32Q. The wire rope 5Q is hung so as to contact at least the upper end portion of the first peripheral surface of the first idler sheave 31Q, and so as to contact at least the lower end portion of the second peripheral surface of the second idler sheave 32Q. It is hung. Further, the wire rope 5Q is bridged along the vertical direction from the first idler sheave 31Q toward the second idler sheave 32Q. Further, the spool drum 20 rotates along the rotation direction such that the peripheral surface of the spool drum 20 moves from the upper side to the lower side in the region facing the idler sheave portion 3Q. The feeding position of the wire rope 5Q on the spool drum 20 is disposed on the upper end side of the drum body 21.

  As described above, the first idler sheave 31Q and the second idler sheave 32Q may be arranged at different positions in the vertical direction. In this case, the wire rope 5Q is bridged between the first idler sheave 31Q and the second idler sheave 32Q so that the height of the wire rope 5Q changes. As a result, the fleet angle of the wire rope 5Q can be reduced as compared with the case where the wire rope 5Q is directly bridged from the spool drum 20 to the brake drum 40. Further, the size of the rope feeding device 1Q in the front-rear direction can be reduced. In FIG. 6, the first idler sheave 31Q may be disposed below the second idler sheave 32Q, and the rotation direction of each sheave may be set in the opposite direction. In this case, the wire rope 5Q is hung at least on the lower end portion of the first peripheral surface of the first idler sheave 31Q, and is hung on at least the upper end portion of the second peripheral surface of the second idler sheave 32Q.

  (3) Moreover, in said embodiment, although demonstrated using the disc brake in the brake drum part 4 as a mechanism which provides predetermined | prescribed tension | tensile_strength to the wire rope 5, this invention is not limited to this. A mode in which tension is applied to the wire rope 5 spanned between the brake drum 40 and the jib hoisting winch 19 (winch drum) using another load generation mechanism may be used.

  (4) In the above embodiment, the spool drum 20 and the brake drum 40 are arranged side by side in the horizontal direction, but the present invention is not limited to this. As an example, the brake drum 40 may be disposed at a higher position than the spool drum 20. Even in this case, the wire rope 5 is hung on the first idler sheave 31 and the second idler sheave 32 in a zigzag manner, so that the fleet angle of the wire rope 5 is reduced by the diameter of the first idler sheave 31 and the second idler sheave 32. can do. Further, when viewed from a direction parallel to the axis of the spool drum 20, the first idler sheave 31 and the second idler sheave 32 are arranged at positions shifted from each other in a direction orthogonal to the direction in which the spool drum 20 and the brake drum 40 are arranged. It is desirable that Further, it is more desirable that the first idler sheave 31 is disposed closer to the brake drum 40 than the second idler sheave 32.

  (5) In the above embodiment, as shown in FIG. 1, the jib hoisting winch 19, the main winding winch 18, and the auxiliary winding winch 17 are shown as being mounted on the lower boom 13. However, the present invention is not limited to this. Further, winch drums exemplified by the jib hoisting winch 19, the main winding winch 18 and the auxiliary winding winch 17 may be mounted on the upper swing body 12. In this case, each winch drum is disposed on the upper swing body 12 behind the position shown in FIG. For this reason, it is sufficient that the wire rope 5 is unwound and wound up with respect to each winch drum in a state where there is no obstacle in the assembly process of the crane 10 such as before the lower boom 13 is mounted on the upper swing body 12. . Further, another sheave unit similar to the sheave 100 of FIG. 1 may be additionally provided, and the wire rope 5 may be guided to each winch drum on the upper swing body 12. Alternatively, the wire rope 5 may be wound up alone before each winch drum is mounted on the upper swing body 12 and mounted on the upper swing body 12 after being wound up.

DESCRIPTION OF SYMBOLS 1 Rope delivery apparatus 1S Base 2 Spool drum part 20 Spool drum 21 Drum trunk | drum (torso part)
22 Flange 22
2M spool drum rotating machine (drive mechanism)
2S Spool drum support part 2T Spool drum rotating shaft 3 Idler sheave part (guide part)
31 First idler sheave 31T First shaft (first shaft portion)
32 2nd idler sheave 32T 2nd shaft (2nd shaft part)
3S Frame 4 Brake drum section 40 Brake drum (tensioning drum)
40S Brake drum support part 41 Brake drum rotating machine 40T Brake drum rotating shaft 5 Wire rope 10 Crane 11 Lower traveling body 12 Upper turning body 13 Lower boom 14 Cab 15 Mast 16 Counterweight 17 Supplementary winding winch 18 Main winding winch 19 Jib Winch 20 for hoisting Sheave unit for winding

Claims (9)

A rope feeding device for feeding the rope while applying tension toward a winch drum capable of winding the rope,
A cylindrical outer peripheral surface, and a body around which the rope is wound; and an axial center of the cylindrical outer peripheral surface is disposed so as to extend along a horizontal direction. A spool drum for feeding out the rope by rotating;
A tension applying drum that is disposed between the spool drum and the winch drum, and applies tension to the rope by contacting the rope fed from the spool drum at a specific contact position;
A guide portion that is disposed between the spool drum and the tension applying drum and guides the rope fed out from the spool drum;
Have
The guide portion is
A first idler sheave having a first circumferential surface on which the rope fed from the spool drum is hung;
A first support that supports the first idler sheave so as to be rotatable and movable along an axial direction parallel to the axis of the spool drum;
A second idler sheave comprising a second peripheral surface on which the rope that has passed through the first peripheral surface of the first idler sheave is hung;
A second support for supporting the second idler sheave so as to be rotatable and movable along the axial direction;
With
When viewed from a direction parallel to the axis of the spool drum, the first idler sheave and the second idler sheave are formed on the surfaces of the regions on the opposite sides of the first peripheral surface and the second peripheral surface. Support the ropes so that the ropes touch each other,
The first support portion and the second support portion are configured to change the first idler sheave and the second idler according to a change in a feeding position of the rope in the axial direction on the spool drum as the spool drum rotates. A rope feeding device that supports the first idler sheave and the second idler sheave such that a sheave moves relative to the spool drum and the tension applying drum along the axial direction.   The first idler sheave and the second idler sheave are displaced from each other in a direction orthogonal to the direction in which the spool drum and the tension applying drum are aligned as viewed from a direction parallel to the axis of the spool drum. Item 2. A rope feeding device according to item 1.   The rope feeding device according to claim 2, wherein the first idler sheave is disposed closer to the tension applying drum than the second idler sheave. The first idler sheave is disposed above the second idler sheave;
The rope feeding device according to claim 3, wherein the rope is hung so as to be in contact with at least an upper end portion of the first peripheral surface of the first idler sheave. The spool drum rotates along a rotation direction such that the peripheral surface of the spool drum moves from above to below in a region facing the guide portion;
The rope feeding device according to claim 4, wherein a feeding position of the rope on the spool drum is disposed on an upper end side of the trunk portion. The first idler sheave is disposed below the second idler sheave;
The rope feeding device according to claim 3, wherein the rope is hung so as to contact at least a lower end portion of the first peripheral surface of the first idler sheave. The spool drum rotates along a rotation direction such that a peripheral surface of the spool drum moves from below to above in a region facing the guide portion;
The rope feeding device according to claim 6, wherein a feeding position of the rope on the spool drum is disposed on a lower end side of the trunk portion.   A pedestal that supports the spool drum, the guide portion, and the tension applying drum is further provided so that the spool drum, the guide portion, and the tension applying drum are integrally mounted on a vehicle body of a predetermined moving vehicle and are movable. The rope feeding device according to any one of claims 1 to 7, further comprising:   The driving mechanism for rotating the spool drum around the axis so that the rope fed out from the winch drum can be wound around the spool drum via the guide portion. The rope feeding device according to any one of 8.

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