JP4615681B2 - Hook block suspension mechanism for vehicle-mounted crane - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a hook block suspending mechanism for hoisting and suspending a hook block at a tip end portion of a telescopic boom that can be raised and lowered in a vehicle-mounted crane.
[0002]
[Prior art]
A conventional example of a hook block hanging mechanism of a five-wire rope hanging type vehicle-mounted crane targeted by the present invention will be described with reference to FIGS.
[0003]
Reference numeral 1 denotes a telescopic boom of a vehicle-mounted crane, and three booms of substantially the same diameter that are rotatably supported on a support shaft 6 that is bridged between both side plates 3 and 4 are provided at the boom tip 2. First to third boom tip pulleys 7, 8, 9 are arranged.
[0004]
The support shaft 6 is provided so as to be orthogonal to the expansion / contraction direction of the telescopic boom 1 in the horizontal direction. The boom tip pulleys 7, 8, and 9 are arranged on the support shaft 6 from the left in the front view of FIG. A three-boom tip pulley 9, a first boom tip pulley 7, and a second boom tip pulley 8 are arranged in this order.
[0005]
The third boom tip pulley 9 and the first boom tip pulley 7 are arranged close to each other with the side plate 4 interposed therebetween, and the first boom tip pulley 7 and the second boom tip pulley 8 are arranged at a predetermined interval. The outer periphery of the third boom tip pulley 9 is covered with a cover member 5.
[0006]
The arrangement of the three pulleys is not limited to the arrangement described above. For example, the first boom tip pulley 7, the third boom tip pulley 9 from the left between the side plates 3 and 4 in the front view of FIG. The first boom tip pulley 7 and the third boom tip pulley 9 are arranged in the order of the second boom tip pulley 8 and the third boom tip pulley 9 and the second boom tip pulley 8 are predetermined. Some of them are arranged at intervals, and such a thing also has the problem described later.
[0007]
A hook block 20 is suspended by the boom tip pulleys 7, 8, and 9, and includes a pulley support 21, first and second hook block pulleys 25 and 26, and a hook 30.
[0008]
The pulley support body 21 includes a pair of left and right side end plates 22 and 23, a pulley support shaft 24 that is bridged between the side end plates 22 and 23 and rotatably supports the first and second hook block pulleys 25 and 26. A hook mounting member 31 below the first and second hook block pulleys 25 and 26 and parallel to the pulley support shaft 24 and rotatably bridged between the side end plates 22 and 23, and both side ends. It consists of a connecting member 27 that connects between the plates 22 and 23.
[0009]
The pulley support shaft 24 is orthogonal to the support shaft 6 of the boom tip 2 in the horizontal direction. On the pulley support shaft 24, a first hook block pulley 25 and a second hook block pulley 25 that are rotatable and have substantially the same diameter. The hook block pulleys 26 are spaced apart from each other by a predetermined distance, the first hook block pulley 25 is on the side plate 22 on the right side in the side view of FIG. 9, and the second hook block pulley 26 is on the left side in FIG. It arrange | positions so that it may become the end plate 23 side.
[0010]
The hook mounting member 31 has a hook axis Y on a surface perpendicular to the pulley support shaft 24 in the vertical direction and passing through the axis of the pulley support shaft 24. A hook 30 is attached so that it can be twisted around.
[0011]
Further, a connecting member 27 is interposed between the side end plates 22 and 23, and the connecting member 27 is formed of a flat plate curved so as to wrap the first and second hook block pulleys 25 and 26 from below. The part is welded to the both side end plates 22 and 23.
[0012]
On the other hand, a projection 28 is provided almost directly above the side end plate 22, and a wire rope rope end stopper 29 is fixed to the projection 28.
[0013]
The wire rope 10 is pulled out from a winch (not shown) disposed on the base end side of the telescopic boom 1, and the first boom tip pulley 7, the first hook block pulley 25, the second boom tip pulley 8, and the second hook block pulley. 26, the third boom tip pulley 9 is hung around in this order, and the end of the rope is fixed to the wire rope end stop 29 of the hook block 20.
[0014]
The conventional hook block suspending mechanism is configured in this manner. In particular, the wire rope rope end stop 29 disposed on the hook block 20 is in the vicinity of the vertical plane passing through the rotation axis of the hook block pulleys 25 and 26, that is, FIG. As shown in the front view, the pulley support 21 is disposed so as to be located almost directly above the axis of the pulley support shaft 24.
[0015]
Therefore, the hook 30 around the rotation axis of the pulley support shaft 24 as viewed in FIG. 10, that is, the swinging force around the rotation axis of the hook block pulley caused by the wire rope tension acting on the wire rope rope end stop 29. The swinging motion of the pulley supporter 21 can be reduced, and the swinging of the pulley support 21 in this direction is prevented.
[0016]
[Problems to be solved by the invention]
However, such an arrangement of the wire rope rope end stopper 29 is such that the wire rope 10 from the third boom tip pulley 9 to the wire rope rope end stopper 29 is in an inclined state as shown in FIG. The force from the wire rope 10 acting on the wire rope end stop 29 causes the pulley support 21 to generate a torsional force that rotates the pulley support 21 around the hook axis Y in the horizontal plane. Since the torsional force fluctuates according to the magnitude of the load hung on the hook 30, there is a problem that the entire hook block 20 is not stable in the torsional direction. In the conventional example, as shown in FIG. 9, the hook block 20 is supported by three ropes on the right side and two ropes on the left side, and the center of rotation of the hook 30 is two. Since the hook block 20 is located between the hook block pulleys 25 and 26, the hook block 20 corresponds to the vertical plane direction parallel to the rotation axis of the hook block pulleys 25 and 26 according to the magnitude of the load applied to the hook 30. 9 has a problem of swinging in the left-right direction .
[0017]
The present invention thus solves the two problems of twisting and swinging that the conventional hook block suspension mechanism has in this way.
[0018]
[Means for Solving the Problems]
Means for achieving the object of the present invention are as follows.
[0019]
A hook block suspending mechanism for hoisting and hanging a hook block at a distal end portion of a telescopic boom that can be raised and lowered of a vehicle-mounted crane, and is pivotally supported by the distal end portion of the telescopic boom. A plurality of boom tip pulleys, and the hook block has a pulley support, two hook block pulleys pivotally supported by the pulley support, and is rotatably attached to the pulley support about an axis. And a wire rope rope end stopper attached to the pulley support, the wire rope being a first boom tip pulley, a first hook block pulley, a second boom tip pulley, and a second hook block pulley. In the hook block suspension mechanism in the vehicle-mounted crane, the rope end is fastened to the wire rope rope end stopper after hanging around in order of the third boom tip pulley. Wire rope rope end stop, the third place in the pulley support so as to be positioned below the wire rope outlet end of the boom tip sheave, and the hook axis, the plane of the hook block in the unloaded condition The pulley support is positioned so that it is located in the vicinity of the resultant force application point of the equal acting force acting on each hook block side engagement point of the five wire rope portions spanned between the boom tip portion and the hook block. Arranged configuration.
[0021]
The wire rope rope end stopper is disposed on the pulley support so as to be positioned below the wire rope leading portion of the third boom tip pulley , and the hook axis is a hook block in an unloaded state. On the line connecting the first hook block pulley and the second hook block pulley intermediate point on the pulley support shaft and the mounting position of the wire rope end stop on the pulley spindle in plan view of the line, from the intermediate point to the line The structure which has arrange | positioned in the position biased to the said wire rope rope end stopper side only about 1/5 of length.
[0023]
Further, the pulley support is formed as an integral block member. And this structure simplifies the manufacture of the hook block.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
1 to 5 show an embodiment, and the same reference numerals are assigned to the same components as those of the conventional example described with reference to FIGS.
[0025]
As in the conventional example, the boom tip 2 of the telescopic boom 1 is provided with three first to third boom tip pulleys 7 having substantially the same diameter so as to be rotatable around a support shaft 6 bridged between the side plates 3 and 4. 8, 9 are arranged.
[0026]
The support shaft 6 is disposed so as to be orthogonal to the telescopic direction of the telescopic boom 1 in the horizontal direction, and the boom tip pulleys 7, 8, and 9 are viewed from the left in the front view of FIG. , The first boom tip pulley 7 and the second boom tip pulley 8 are arranged in this order.
[0027]
The third boom tip pulley 9 and the first boom tip pulley 7 are arranged close to each other with the side plate 4 interposed therebetween, and the first boom tip pulley 7 and the second boom tip pulley 8 are arranged at a predetermined interval. The outer periphery of the third boom tip pulley 9 is covered with a cover member 5.
[0028]
The arrangement of the three pulleys is not limited to the arrangement described above. For example, as seen from the front view of FIG. 2, the first boom tip pulley 7 and the third boom tip pulley 9 are arranged between the side plates 3 and 4 from the left. The first boom tip pulley 7 and the third boom tip pulley 9 are arranged close to each other in the order of the second boom tip pulley 8, and the third boom tip pulley 9 and the second boom tip pulley 8 are predetermined. It may be arranged with an interval of.
[0029]
Reference numeral 20 denotes a hook block according to the present invention which is suspended by the boom tip pulleys 7, 8, and 9. The hook block includes a pulley support 21, first and second hook block pulleys 25 and 26, and a hook 30. Shown in FIGS.
[0030]
The pulley support body 21 includes a pair of left and right side end plates 22 and 23, a pulley support shaft 24 that is bridged between the side end plates 22 and 23 and rotatably supports the first and second hook block pulleys 25 and 26. A hook attachment member 31 below the first and second hook block pulleys 25 and 26 and parallel to the pulley support shaft 24 and rotatably bridged between the side end plates 22 and 23, and both side end plates It consists of a connecting member 27 that connects between 22 and 23.
[0031]
The pulley support shaft 24 is orthogonal to the support shaft 6 of the boom tip 2 in the horizontal direction, and the hook block pulleys 25 and 26 of the hook block 20 suspended by the wire rope 10 are connected to the boom tip pulley 7. , 8 and 9 are orthogonal to each other in plan view, and a first hook block pulley 25 and a second hook block pulley 26 which are rotatable and have substantially the same diameter are provided on the pulley support shaft 24. The first hook block pulley 25 is on the right side end plate 22 side in the side view of FIG. 1, and the second hook block pulley 26 is on the left side end plate 23 side in the same manner as shown in FIG. It is arranged to become.
[0032]
The hook attachment member 31 has a hook axis Y in the vertical direction, and a hook 30 is attached so that it can be twisted around the hook axis Y.
[0033]
Further, a connecting member 27 is interposed between the side end plates 22 and 23, and the connecting member 27 is formed of a flat plate curved so as to wrap the first and second hook block pulleys 25 and 26 from below. The part is welded to the both side end plates 22 and 23.
[0034]
On the other hand, on one side of the side end plates 22, 23, that is, on the side below the third boom tip pulley 9 as shown in FIG. A member 32 is welded so as to sandwich the both end plates 22 and 23, and a wire rope rope end stop 29 is provided in the vicinity of the first hook block pulley 25 of the U-shaped member 32 as shown in FIG. An opening 33 for fastening is provided.
[0035]
The wire rope 10 is pulled out from a winch (not shown) disposed on the base end side of the telescopic boom 1 and is connected to the first boom tip pulley 7, the first hook block pulley 25, the second boom tip pulley 8, and the second hook block. A pulley 26 and a third boom tip pulley 9 are hung around in this order, and the rope end is fixed to the wire rope rope end stop 29 fixed to the opening 33 of the U-shaped member 32 formed by welding the rope end to the hook block 20. To wear.
[0036]
Note that the wire rope suspended from the first boom tip pulley 7 to the first hook block pulley 25 by hanging the wire rope in this way is the left side in the plan view of FIG. Since it enters from the opening 33 side of the member 32 and goes around the lower side of the first hook block pulley 25 and exits from the right side of the figure, the opening 33 side of the U-shaped member 32 is connected to the first hook block. It is provided on the wire rope introduction part side to the pulley 25.
[0037]
Furthermore, in this embodiment, the position near the wire rope introduction portion to the first hook block pulley 25, which is the attachment position of the wire rope rope end stopper 29, is set as the position of the opening 33 provided with the U-shaped member 32. However, the U-shaped member 32 is not essential. For example, a member corresponding to the protruding portion 28 described in FIG. 10 is provided at the leftmost end of the upper end portion of the side end plate 22 in FIG. May be used as an alternative to the opening 33 of the U-shaped member 32.
[0038]
Thus, the wire rope rope end stopper 29 is located on the lower side of the third boom tip pulley 9 as seen in the front view of FIG. 2, and on the first hook block pulley 25 side as seen in the side view of FIG. Since the wire rope 10 connected to the wire rope rope end stop 29 is not inclined as in the conventional example, the hook block 20 is not twisted.
[0039]
Next, the attachment position of the hook axis Y of the hook 30 attached perpendicularly to the hook attachment member 31 will be described with reference to FIG.
[0040]
On the axial center of the pulley support shaft 24 that supports the first hook block pulley 25 and the second hook block pulley 26, and between the intermediate point P between the pulleys 25 and 26, the U-shaped member 32 The center point of the opening 33 is connected by a line R.
[0041]
Then, the center point of the opening 33 is biased from the intermediate point P by about 1/5 of the length of the line segment formed by the intermediate point P on the line R and the center point of the opening 33 of the U-shaped member 32. A hook axis Y is provided at the position.
[0042]
The reason for providing the hook axis Y at such a position is that this position has an equal acting force that acts on each hook block side engaging point of the five wire rope portions spanned between the boom tip and the hook block. This is because it becomes a resultant force point.
[0043]
That is, first, regarding the resultant force applied point at the pulleys 25 and 26, the resultant applied force point is an intermediate point on the axis of the pulley support shaft 24 and at the center between the pulleys 25 and 26. Become P.
[0044]
However, since the fifth wire rope actually acts on the center point of the opening 33 of the U-shaped member 32, the total resultant force application point connects the intermediate point P and the center point of the opening 33. It will move to somewhere on the line R.
[0045]
The amount of movement is determined according to the ratio of the force acting on the intermediate point P and the force acting on the center point of the opening 33, and acts on the force acting on the intermediate point P and the center point of the opening 33. Since the force ratio is in a 4-to-1 relationship, the amount of movement is approximately the length of the line segment connecting the intermediate point P and the intermediate point P to the center point of the opening 33 of the U-shaped member 32. Therefore, the present invention is such that the hook axis Y of the hook 30 is provided at this position.
[0046]
By adopting such a configuration, the hook block pulley side on the right side (right side in FIG. 1) where the center of rotation of the hook is supported by three ropes, as is apparent from FIGS. Therefore, the hook block can be prevented from swinging left and right as viewed in FIG.
If the size of the first hook block pulley 25 and the second hook block pulley 26 or the boom tip pulleys 7, 8, and 9 is changed, the position becomes a resultant force application point determined by five wire ropes.
[0047]
6 to 8 show other embodiments having different hook blocks. The hook block is composed of an integral block member 35. The block member 35 has a substantially rectangular shape whose height is lower than the width, and a protruding portion 36 having an opening 37 for fixing the wire rope end stop 29 is formed at one end thereof. .
[0048]
Further, a pulley support shaft 24 on which the first hook block pulley 25 and the second hook block pulley 26 are pivotally attached is horizontally attached to the block member 35, and the shaft of the hook 30 is overlapped with the pulley support shaft 24. It is mounted vertically so that it does not become.
[0049]
The opening 37 of the protruding portion 36 is provided in the vicinity of the left side portion of the first hook block pulley 25 when viewed from the wire rope introduction portion of the first hook block pulley 25, that is, in the plan view of FIG.
[0050]
Further, the hook axis Y of the hook 30 is on the axis of the pulley support shaft 24 that supports the first hook block pulley 25 and the second hook block pulley 26 as shown in FIG. A line composed of the intermediate point P and the central point of the opening 33 of the U-shaped member 32 on the line R connecting the intermediate point P between the pulleys 25 and 26 and the central point of the opening 37 of the protruding portion 36. A hook axis Y is provided at a position deviated from the intermediate point P toward the center point side of the opening 33 by approximately 1/5 of the length.
[0051]
Although the block member 35 of the embodiment has been described as that of FIGS. 6 to 8, the shape thereof can support the pulley support shaft 24 and the hook 30, and the wire rope end stop 29. Any shape can be used as long as it has a portion that can be fixed. Moreover, although the Example demonstrated what arrange | positioned the hook pulley on the same axis line, it is applicable also to what is not arrange | positioned on the same axis line.
[0052]
【The invention's effect】
In the present invention, the wire rope rope end stopper is arranged on the pulley support so as to be positioned in the vicinity of the wire rope introduction portion to the first hook block pulley, and the torsion axis of the hook is a hook block in an unloaded state. The pulley support is positioned so as to be located in the vicinity of the resultant force application point of the equal acting force acting on each hook block side engagement point of the five wire rope portions spanned between the boom tip portion and the hook block in a plan view of by arranging the body, the hook block vertical plane parallel direction to the rotation axis of the pulley, i.e., including the swing in the lateral direction of the viewed in FIG. 1, be without kinking and swinging of the entire hook block simultaneously The vertical movement of the entire hook block can be stabilized.
[0053]
Further, by configuring the pulley support body as an integral block member, the manufacture of the hook block can be simplified and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a side view of a hook block suspension mechanism in a vehicle-mounted crane according to the present invention.
FIG. 2 is a front view of a hook block suspension mechanism in a vehicle-mounted crane according to the present invention.
FIG. 3 is a front view of a hook block according to the present invention.
FIG. 4 is a side view of the hook block of the present invention.
FIG. 5 is a plan view of a hook block according to the present invention.
FIG. 6 is a front view of another embodiment of the hook block of the present invention.
FIG. 7 is a side view of another embodiment of the hook block of the present invention.
FIG. 8 is a plan view of another embodiment of the hook block of the present invention.
FIG. 9 is a side view of a hook block suspension mechanism in a conventional vehicle-mounted crane.
FIG. 10 is a front view of a hook block suspension mechanism in a conventional vehicle-mounted crane.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Telescopic boom 2 Boom front-end | tip part 3, 4 Side board 5 Cover member 6 Spindle 7 1st boom front end pulley 8 2nd boom front end pulley 9 3rd boom front end pulley 10 Wire rope 20 Hook block 21 Pulley support body 22,23 Side end Plate 24 Pulley spindle 25 First hook block pulley 26 Second hook block pulley 27 Connecting member 28 Protrusion 29 Wire rope rope end stop 30 Hook 31 Hook attachment member 32 U-shaped member 33 Opening 35 Block member 36 Protrusion 37 Opening

Claims (3)

A hook block suspending mechanism for hoisting and hanging the hook block freely at the tip of a telescopic boom that can be raised and lowered in a vehicle-mounted crane,
There are three boom tip pulleys pivotally supported at the tip of the telescopic boom, the hook block includes a pulley support, and two hook block pulleys pivotally supported by the pulley support. , A hook attached to the pulley support so as to be rotatable about an axis, and a wire rope rope end stopper attached to the pulley support, wherein the wire rope is a first boom tip pulley, a first hook. A hook in a vehicle-mounted crane formed by hanging a block pulley, a second boom tip pulley, a second hook block pulley, and a third boom tip pulley in that order, and then fixing the rope end to the wire rope rope end stopper. In the block suspension mechanism,
The wire rope rope end stopper is disposed on the pulley support so as to be positioned below the wire rope lead-out portion of the third boom tip pulley , and the hook axis is a hook block in an unloaded state. The pulley support body is positioned so as to be located in the vicinity of a resultant force application point of equal acting force acting on each hook block side engagement point of the five wire rope portions spanned between the boom tip portion and the hook block in a plan view. A hook block suspension mechanism in a vehicle-mounted crane, characterized in that A hook block suspending mechanism for hoisting and hanging the hook block freely at the tip of a telescopic boom that can be raised and lowered in a vehicle-mounted crane,
The telescopic boom has three boom tip pulleys with substantially the same diameter that are pivotally supported at the distal end of the boom, and the hook block has a pulley support and substantially the same diameter that is pivotally supported by the pulley support. Two hook block pulleys, a hook attached to the pulley support so as to be rotatable about an axis, and a wire rope end stop attached to the pulley support. After hanging around the boom tip pulley, the first hook block pulley, the second boom tip pulley, the second hook block pulley, and the third boom tip pulley in this order, the end of the rope is fastened to the wire rope end stop. In the hook block suspension mechanism in the vehicle-mounted crane,
The wire rope rope end stopper is disposed on the pulley support so as to be positioned below the wire rope lead-out portion of the third boom tip pulley , and the hook axis is a hook block in an unloaded state. It is on a line segment connecting the first hook block pulley and second hook block pulley intermediate point on the pulley spindle in plan view and the attachment position of the wire rope rope end stopper, and from the intermediate point to the line segment A hook block suspension mechanism in a vehicle-mounted crane, wherein the hook block suspension mechanism is disposed at a position deviated toward the wire rope end stop side by approximately 1/5 of the length.   The hook block suspension mechanism in a vehicle-mounted crane according to claim 1 or 2, wherein the pulley support is made of an integral block member.

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