JP2015093743A - Crane wire vibration suppression device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crane wire vibration suppression device capable of suppressing abnormal vibration of a hoisting wire rope due to strong wind, preventing contact of the hoisting wire rope with a boom or an attachment of the boom, and ensuring prevention of damage of the hoisting wire rope and wear of the attachment of the boom.SOLUTION: A wire vibration suppression device includes a guide unit 21 pressing and supporting a longitudinal intermediate portion of a hoisting wire rope 13 extending laterally of a boom 7 that stands and changing a natural frequency of the hoisting wire rope 13 when the boom 7 is revolved upward around a pivotal point O to stand during operation stop.

Description

  The present invention relates to a wire vibration suppression device for a crane.

  FIG. 7 shows an example of a general container crane. Reference numeral 1 denotes a container crane, and the container crane 1 can travel along a traveling rail 3 laid on a quay 2 of a harbor via wheels 4. The four legs 5 are spaced apart from each other in the running direction and in the direction perpendicular to the running direction, and the girder 6 extends in the horizontal direction perpendicular to the running direction of the legs 5 above the leg 5. And a boom 7 pivotally attached to the tip of the girder 6 and disposed so as to project horizontally from the tip of the girder 6 toward the sea side during operation, and along the girder 6 and the boom 7. The trolley 8 is disposed so as to be capable of traversing by driving the traversing wire 11 by the traversing drum 10 in the machine chamber 9, and from the trolley 8 by driving the hoisting wire 13 by the hoisting drum 12 in the machine chamber 9. 14 up and down Suspended, by gripping and releasing the containers 15 by the spreader 14 so as to be conveyed to the container 15.

  When the operation is suspended, the boom 7 is turned up around the pivot point O by the hoisting wire 17 being wound up by the hoisting drum 16 in the machine room 9 to stand.

  From the upper end of the leg portion 5 disposed on the sea side, a frame 18 extending upward from the top end of the girder 6 is erected, and the upper end of the frame 18 and the intermediate portion required position of the girder 6 are set. In addition to being connected by a backstay 19, the upper end of the frame 18 and the required position on the tip side of the boom 7 are connected by a tension bar 20 that can be bent in the middle, and the load of the boom 7 that projects in the horizontal direction during operation is applied. The frame 18 supported by the back stay 19 is supported via the tension bar 20.

  In addition, there exists patent document 1 as what shows the general technical level relevant to the container crane 1 as shown in FIG.

JP 2013-82506 A

  By the way, the hoisting wire 13 is disposed close to the boom 7, and the hoisting wire 13 is raised in a state in which the boom 7 is turned up around the pivot point O during operation stop. However, if a strong wind blows in this state, the hoisting wire 13 is blown by the strong wind and causes abnormal vibration, and the rail 7 for traversing the boom 7 and its associated trolley 8 is supported. Contact with a piece (not shown) or the like was repeated, and the winding wire 13 was damaged or the rail pressing piece was worn out.

  The present invention has been made in view of the above-described conventional problems, can suppress abnormal vibration of the hoisting wire due to strong winds, prevent the hoisting wire from contacting the boom and its accessories, and take up the hoisting wire. An object of the present invention is to provide a wire vibration suppression device for a crane that can surely prevent the damage of the boom and the wear of the accessory of the boom.

The present invention is a wire vibration suppression device for a crane that causes a boom to turn up around a pivot point during operation stop and stands up,
Wire vibration suppression of a crane comprising a guide unit that presses and supports a longitudinal intermediate portion of a hoisting wire extending along a side of the standing boom and changes a natural frequency of the hoisting wire It depends on the device.

In the wire vibration suppression device for the crane, the guide unit includes:
A support member installed so as to protrude in a horizontal direction in a plane parallel to a surface where the boom rises and lowers with respect to a frame erected near the standing position of the boom;
A base bracket attached to the support member so as to be positionally adjustable in the horizontal direction;
A guide receiving frame that is attached to the tip of the base bracket and takes in the winding wire when the boom is raised;
It is preferable to have an elastic pad attached to the inner surface of the guide receiving frame and pressing and supporting the hoisting wire.

  According to the wire vibration suppressing device for a crane of the present invention, abnormal vibration of the hoisting wire due to strong wind can be suppressed, and the hoisting wire can be prevented from coming into contact with the boom and its accessories, and the hoisting wire can be damaged. It is possible to achieve an excellent effect of reliably preventing wear of the accessory.

It is a side view which shows the Example of the wire vibration suppression apparatus of the crane of this invention. It is the II section enlarged view of FIG. It is the III-III arrow line view of FIG. It is the IV-IV arrow line view of FIG. It is the V section enlarged view of FIG. It is VI-VI arrow line view of FIG. It is a whole side view which shows an example of a container crane.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 to 6 show an embodiment of the crane wire vibration suppression device of the present invention. In the figure, the same reference numerals as those in FIG. 7 denote the same components, and the basic configuration is shown in FIG. However, the present embodiment is characterized in that the middle portion in the longitudinal direction of the hoisting wire 13 extending along the side of the standing boom 7 as shown in FIGS. And a guide unit 21 that changes the natural frequency of the hoisting wire 13 by pressing and supporting the winding wire 13.

  In the case of the present embodiment, the guide unit 21 supports the support member 22 so as to project in a horizontal direction within a plane parallel to the surface on which the boom 7 rises and lower, with respect to the frame 18 erected in the vicinity of the standing position of the boom 7. A base bracket 23 is attached to the support member 22 so that the position of the support member 22 can be adjusted in the horizontal direction, and a guide receiving frame 24 that takes in the hoisting wire 13 when the boom 7 stands is attached to the tip of the base bracket 23. The elastic pad 25 that presses and supports the winding wire 13 is attached to the inner surface of the guide receiving frame 24.

  As shown in FIG. 5, the base bracket 23 attached to the support member 22 is provided with a long hole 23a, and an adjustment fastening member 23b such as a bolt and a nut is tightened in the long hole 23a. 7 When the vertical position of the winding wire 13 at the time of standing is pushed to the sea side (right side in FIGS. 1, 2, 4, 5, and 6) by a required dimension (for example, about 50 mm). As described above, the mounting position of the base bracket 23 with respect to the support member 22 can be adjusted, and the base bracket 23 is fixed by the fixing fastening member 23c after the mounting position is determined.

  Further, the hoisting wire 13 does not become completely vertical when the boom 7 is raised, and is slightly tilted forward as shown in FIGS. 1 and 2, so that the guide unit is adapted to this forward tilt angle. As shown in FIG. 6, the guide receiving frame 24 of 21 is attached to the base bracket 23 so as to be inclined forward.

  Further, as shown in FIG. 6, the elastic pad 25 has a contact surface for pressing and supporting the intermediate portion in the longitudinal direction of the winding wire 13 in an arc shape, and is locally excessively large with respect to the winding wire 13. Is prevented from acting.

  Next, the operation of the above embodiment will be described.

  When the boom 7 is pivoted upward about the pivot point O during the operation stop, the hoisting wire 13 disposed close to the boom 7 also rises along with the boom 7. The upper wire 13 is taken into the guide receiving frame 24 of the guide unit 21 and is pressed and supported by the elastic pad 25.

  When strong wind blows with the boom 7 raised, the winding wire 13 is shaken due to the turbulence of the wind flow when passing through the boom 7, and the vibration of the winding wire 13 and its natural frequency coincide with each other. As a result, the amplitude increases and abnormal vibration of the hoisting wire 13 occurs. In the present embodiment, the longitudinal intermediate portion of the hoisting wire 13 extending along the side of the standing boom 7 is the guide unit. The natural frequency of the winding wire 13 is changed by being pressed and supported by 21 elastic pads 25.

  For this reason, it is avoided that the vibration of the winding wire 13 and the natural frequency thereof coincide with each other, the amplitude does not increase, the abnormal vibration of the winding wire 13 does not occur, and the boom 7 and its associated trolley. The winding wire 13 is prevented from coming into contact with a rail holding piece (not shown) for 8 traversing, so that the winding wire 13 is not damaged and the rail holding piece is not worn.

  Further, the guide receiving frame 24 of the guide unit 21 is attached to the base bracket 23 so as to be tilted forward with respect to the forward tilt angle of the hoisting wire 13 when the boom 7 is raised, as shown in FIG. Furthermore, since the elastic pad 25 has a contact surface for pressing and supporting the intermediate portion in the longitudinal direction of the hoisting wire 13 formed in an arc shape, an excessively large load acts on the hoisting wire 13 locally. This is effective in preventing the winding wire 13 from being damaged.

  In this way, abnormal vibration of the hoisting wire 13 due to strong wind can be suppressed, and the hoisting wire 13 can be prevented from coming into contact with the boom 7 and its accessories, and damage to the hoisting wire 13 and wear of the accessories of the boom 7 can be prevented. It can be surely prevented.

  In addition, the wire vibration suppression device for a crane of the present invention is not limited to the above-described embodiment, and the guide unit may be provided not only on one side of the boom but also on both sides. Of course, various modifications can be made without departing from the scope of the present invention.

1 Container crane (crane)
6 Girder 7 Boom 13 Hoisting wire 18 Frame 21 Guide unit 22 Support member 23 Base bracket 23a Long hole 23b Adjustment fastening member 23c Fixing fastening member 24 Guide receiving frame 25 Elastic pad O Pivoting point

Claims (2)

A wire vibration suppression device for a crane that causes a boom to turn upward around a pivot point during operation stop,
Wire vibration suppression of a crane comprising a guide unit that presses and supports a longitudinal intermediate portion of a hoisting wire extending along a side of the standing boom and changes a natural frequency of the hoisting wire apparatus. The guide unit is
A support member installed so as to protrude in a horizontal direction in a plane parallel to a surface where the boom rises and lowers with respect to a frame erected near the standing position of the boom;
A base bracket attached to the support member so as to be positionally adjustable in the horizontal direction;
A guide receiving frame that is attached to the tip of the base bracket and takes in the winding wire when the boom is raised;
The wire vibration suppression device for a crane according to claim 1, further comprising: an elastic pad attached to an inner surface of the guide receiving frame and pressing and supporting the hoisting wire.

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