JP2019182594A - Winch drum - Google Patents

Abstract

To provide a winch drum that is able to prevent displacement of a hoisting drum member relative to a drum member without using a highly rigid member or structure.SOLUTION: A groove 52b2 is formed in an outer peripheral part of a shaft portion 52b of a drum body 52. Formed in an inner peripheral part of a hoist drum member 53 is a key 53a4 as a rotation restriction part that engages with the groove 52b2 and restricts rotation with respect to the drum body 52. This makes it possible to prevent displacement of the hoist drum member 53 relative to the drum body 52 without using a highly rigid member or structure and, therefore, makes it possible to reduce a manufacturing cost.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a winch drum of a winch used for, for example, a crane apparatus.

  Conventionally, as this type of winch drum, a drum main body extending along the rotation center axis and a rope groove for winding a rope having a predetermined outer diameter are formed on the outer peripheral portion, and can be attached to and detached from the outer peripheral portion of the drum main body. What is provided with the winding drum member attached to is known (for example, refer to patent documents 1).

  In the winch drum, it is possible to select a winding drum member in which a rope groove having a corresponding width is formed according to the outer diameter size of the rope to be wound, and attach the selected winding drum member to the drum body. Yes.

Japanese Utility Model Publication No. 56-158491

  In the winch drum, the drum body and the winding drum member are fastened to each other by a fastening member such as a bolt, and the winding drum member is attached to the drum main body. In the winch drum, since only one end side in the axial direction of the drum body and the winding drum member is fastened to each other by the fastening member, when a large load acts on the rope wound around the winding drum member, the drum main body However, the winding drum member may be displaced. For this reason, in the winch drum, in order to prevent the displacement of the winding drum member with respect to the drum main body, the drum main body and the winding drum member are each formed of a member having high rigidity that is not easily deformed, or a structure having high rigidity. It may be necessary to increase the manufacturing cost.

  An object of the present invention is to provide a winch drum that can prevent displacement of the winding drum member with respect to the drum body without using a highly rigid member or structure.

  In order to achieve the above object, the winch drum of the present invention includes a drum main body extending along the rotation center axis and a rope groove for winding a rope having a predetermined outer diameter on the outer peripheral portion. A winding drum member that is detachably attached to the outer peripheral portion, and a groove is formed in the outer peripheral portion of the drum body, and an inner peripheral portion of the winding drum member is engaged with the groove and rotates relative to the drum main body. A rotation restricting portion for restricting is formed.

  As a result, the rotation of the winding drum member relative to the drum body is restricted by engaging the rotation restricting portion with the groove, so that the displacement of the winding drum member relative to the drum main body can be prevented without using a highly rigid member or structure. Is done.

  According to the present invention, since it is possible to prevent the displacement of the winding drum member with respect to the drum body without using a highly rigid member or structure, it is possible to reduce the manufacturing cost.

It is a side view of the mobile crane which shows one Embodiment of this invention. It is a top view of a winch drum. It is a plane sectional view of a winch drum. It is side surface sectional drawing of a winch drum. It is an exploded plane sectional view of a winch drum. It is an exploded side sectional view of a winch drum. It is side surface sectional drawing of the winch drum which shows other embodiment of this invention.

  1 to 6 show an embodiment of the present invention.

  As shown in FIG. 1, a mobile crane 1 having a winch to which a winch drum of the present invention is applied includes a vehicle body 10 for traveling in a general road or a work area, and a crane apparatus for performing crane work. 20 and a cab 30 for operating the vehicle body 10 and performing crane operations by the crane device 20. The crane device 20 and the cab 30 are supported by a turntable 40 that can turn in the horizontal direction with respect to the vehicle body 10, the crane device 20 is arranged on one side in the width direction of the turntable 40, and the cab 30 is arranged on the other side in the width direction. ing.

  The vehicle body 10 includes wheels 11 provided on both sides in the width direction on the front side and the rear side, and outriggers 12 provided on the front side of the front wheel 11 and the rear side of the wheel 11 on the rear side. The vehicle body 10 travels by the driving force of the engine.

  The crane device 20 is provided so as to be able to move up and down with respect to the vehicle body 10, a telescopic boom 21 that is telescopic, a rope 22 that extends along the telescopic boom 21 and hangs down from the distal end of the telescopic boom 21, and a winding of the rope 22 A winch 50 that takes out and feeds out, and a hook block 23 that is locked to a rope 22 suspended from the tip of the telescopic boom 21.

  The rope 22 is formed by twisting together a plurality of steel wires or synthetic fibers, and has a predetermined outer diameter according to the material and the tensile strength.

  The winch 50 is provided at a position adjacent to the base end portion of the telescopic boom 21 in the swivel base 40. The winch 50 has a winch drum 51 on which the rope 22 is wound, and performs a winding operation and a feeding operation of the rope 22 by a hydraulic winch motor (not shown).

  As shown in FIGS. 2 to 6, the winch drum 51 includes a drum main body 52 extending along the rotation center axis, and a winding drum member 53 that is detachably attached to the outer peripheral portion of the drum main body 52.

  As shown in FIGS. 3 and 5, the drum body 52 includes a pair of flange portions 52 a disposed on both sides in the central axis direction, and a cylindrical shaft portion 52 b provided between the pair of flange portions. Have.

  In each of the pair of flange portions 52a, a pair of bolt insertion holes 52a1 through which bolts 54 as fastening members for fixing an extension portion, which will be described later, of the winding drum member 53 to the flange portion 52a are inserted. It is formed at a position facing each other with the interposition. A counterbore 52a2 for accommodating the head of the bolt 54 is formed by counterboring on the outer side in the central axis direction of the flange 52a in which the bolt insertion hole 52a1 is formed.

  In addition, a pair of screw holes 52b1 in which bolts 55 as fastening members for fixing a cylindrical portion, which will be described later, of the winding drum member 53 are screwed to the shaft portion 52b are provided on both sides in the axial direction of the shaft portion 52b. Are formed at positions facing each other across the central axis. In addition, as shown in FIGS. 5 and 6, a pair of grooves 52 b 2 extending in the rotation center axis direction are formed at positions facing each other across the center axis on the outer periphery of the shaft part 52 b.

  As shown in FIG. 3, the winding drum member 53 includes a cylindrical portion 53 a formed in a cylindrical shape, and an extending portion 53 b that extends radially outward over the circumferential direction at both axial end portions of the cylindrical portion 53 a. ,have.

  As shown in FIGS. 2 and 3, a rope groove 53 a 1 that spirally extends from one end side in the axial direction toward the other end side is formed in the outer peripheral portion of the cylindrical portion 53 a. The rope groove 53a1 is a groove having an arc-shaped cross section having a width dimension corresponding to the outer diameter dimension of the rope 22 wound around the tubular portion 53a. The ropes 22 wound along the rope groove 53a1 are wound so as to be adjacent to each other without a gap in the axial direction of the tubular portion 53a.

  The extending portion 53b is formed with a winding position adjusting portion 53b1 for guiding the rope 22 wound around the axial end of the cylindrical portion 53a to adjust the winding position in the central axis direction. .

  As shown in FIGS. 5 and 6, the winding drum member 53 includes a pair of winding drum pieces 53 ′ divided along the central axis, and is detachably attached to the outer peripheral portion of the shaft portion 52 b of the drum main body 52. It is done. The pair of winding drum pieces 53 ′ are respectively formed in a cylindrical shape covering the outer peripheral portion of the shaft portion 52 b by being disposed on the outer peripheral portion of the shaft portion 52 b of the drum main body 52.

  As shown in FIG. 5, bolts 55 for fixing the cylindrical portion 53 a of the winding drum member 53 to the shaft portion 52 b of the drum main body 52 are provided on both sides in the axial direction of the cylindrical portions 53 a of the pair of winding drum pieces 53 ′. A bolt insertion hole 53a2 is formed for inserting the. A counterbore part 53a3 in which the head of the bolt 55 is accommodated is formed in the outer peripheral part of the cylindrical part 53a in which the bolt insertion hole 53a2 is formed by counterboring. As shown in FIGS. 5 and 6, the inner circumferential portions of the cylindrical portions 53 a of the pair of winding drum pieces 53 ′ are provided so as to extend in the direction of the rotation center axis, and are engaged with the grooves 52 b 2 of the drum main body 52. A key 53a4 is provided as a matching rotation restricting portion.

  Each extending portion 53b of the pair of winding drum pieces 53 ′ is formed with a screw hole 53b2 into which a bolt 54 for fixing the winding drum member 53 to the flange portion 52a of the drum body 52 is screwed.

  The winch drum 51 configured as described above is fastened to the drum main body 52 by fastening the flange portion 52a and the extending portion 53b with the bolt 54 and fastening the shaft portion 52b and the tubular portion 53a with the bolt 55. On the other hand, the winding drum member 53 is fixed. Further, in the winch drum 51, the key 53a4 provided on the cylindrical portion 53a is engaged with the groove 52b2 of the shaft portion 52b, whereby the rotation of the winding drum member 53 is restricted with respect to the drum main body 52.

  Further, the winch drum 51 can remove the winding drum member 53 from the drum main body 52 by removing the bolts 54 and 55. Accordingly, the winch drum 51 can remove the winding drum member 53 from the drum main body 52 and attach the winding drum member 53 having a different width dimension of the rope groove 53a1 to the drum main body 52. Therefore, a rope having an outer diameter different from the outer diameter of the rope 22 can be used for the winch drum 51.

  Thus, according to the winch drum of this embodiment, the groove 52b2 is formed in the outer peripheral portion of the shaft portion 52b of the drum main body 52, and the groove 52b2 is engaged in the inner peripheral portion of the winding drum member 53, A key 53a4 is formed as a rotation restricting portion that restricts rotation with respect to the drum body 52.

  Accordingly, it is possible to prevent the displacement of the winding drum member 53 with respect to the drum main body 52 without using a highly rigid member or structure, so that the manufacturing cost can be reduced.

  Further, the groove 52b2 and the key 53a4 are formed so as to extend along the central axis direction of the shaft portion 52b.

  Accordingly, the rotation of the winding drum member 53 relative to the drum main body 52 can be reliably restricted by engaging the key 53a4 with the groove 52b2 over the central axis direction of the shaft portion 52b.

  Further, the winding drum member 53 is formed in a cylindrical shape by a pair of winding drum pieces 53 ′ arranged in the circumferential direction of the shaft portion 52b.

  Thereby, since the winding drum member 53 can be attached to the drum main body 52 by arranging the pair of winding drum pieces 53 ′ in the circumferential direction on the shaft portion 52b, the replacement work of the winding drum member 53 is facilitated.

  The pair of winding drum pieces 53 ′ are fastened to the drum main body 52 by bolts 54 and 55, respectively.

  Accordingly, the engagement state of the key 53a4 with the groove 52b2 can be maintained, and thus the rotation of the winding drum member 53 with respect to the drum main body 52 can be more reliably regulated.

  The winding drum member 53 is formed with a winding position adjusting portion 53b1 that guides the rope 22 positioned at the axial end of the drum body 52 and adjusts the winding position of the rope 22.

  This makes it possible to dispose the winding position adjusting portion 53b1 at a position corresponding to the outer diameter dimension of the rope 22 to be wound, so that the rope 22 is not uniformly wound around the winding body member 53. Generation of so-called random winding can be reliably prevented.

  In the above embodiment, the winch drum 51 used for the winch 50 of the mobile crane 1 is shown, but the invention is not limited to this. The winch to which the present invention can be applied may be a stationary winch that moves cargo or a ship, or may be a winch that is suspended from a structure and carries a load.

  In the above-described embodiment, the outer peripheral portion of the shaft portion 52b of the drum main body 52 is covered with the pair of winding drum members 53 '. However, the present invention is not limited to this. As long as it covers the outer peripheral portion of the shaft portion 52b, for example, the outer peripheral portion of the shaft portion 52b of the drum main body 52 may be covered with a winding drum member made of a sheet-like member or three or more winding drum members. Good.

  In the embodiment, the key 53a4 provided in the cylindrical portion 53a of the winding drum member 53 is engaged with the groove 52b2 provided in the shaft portion 52b of the drum main body 52, thereby winding the drum main body 52 around the drum body 52. Although what showed the rotation of the trunk | drum member 53 was shown, it is not restricted to this. For example, as shown in FIG. 7, the spline-processed shaft portion 52b is used as long as the projection formed on the inner peripheral portion of the winding drum member is engaged with the groove formed in the shaft portion of the drum body. Is passed through a winding drum member 53 having a cylindrical portion 53a ′ that is splined to engage the shaft portion 52b ′, so that the winding drum member 53 is rotated with respect to the drum main body 52. You may make it regulate.

  51 ... winch drum, 52 ... drum body, 52a ... flange part, 52b, 52b '... shaft part, 52b2 ... groove, 53 ... winding drum member, 53' ... winding drum piece, 53a, 53a '... cylindrical part, 53a1 ... Rope groove, 53a4 ... key, 53b1 ... winding position adjusting section, 54,55 ... bolts.

Claims (5)

A drum body extending along the rotation center axis;
A rope groove for winding a rope having a predetermined outer diameter is formed on the outer peripheral portion, and a winding drum member that is detachably attached to the outer peripheral portion of the drum body,
A groove is formed on the outer periphery of the drum body,
A winch drum in which a rotation restricting portion that engages with a groove and restricts rotation with respect to the drum body is formed on an inner peripheral portion of the winding drum member. The winch drum according to claim 1, wherein the groove and the rotation restricting portion respectively extend in the direction of the rotation center axis. The winch drum according to claim 1 or 2, wherein the winding drum member is formed in a cylindrical shape by a plurality of winding drum pieces arranged in a circumferential direction of the drum body. The winch drum according to any one of claims 1 to 3, wherein the plurality of winding drum pieces are fastened to the drum body by fastening members. The winding position adjustment part which guides the rope located in the axial direction edge part of a drum main body, and adjusts the winding position of a rope is formed in the winding drum member. Winch drum.