JP4149061B2 - Suspended pendant device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hanging pendant device used in a crane equipped with a long boom.
[0002]
[Prior art]
FIG. 5 shows an example of a crawler crane. The crawler crane includes a lower traveling body 1 that can be self-propelled, an upper revolving body 2 that is turnably mounted on the lower traveling body 1, and a front portion of the upper revolving body 2. The boom 3 and the gate-shaped mast 4 that can be raised and lowered, the A frame 5 that is provided at the rear of the upper swing body 2, and a hoisting drum (not shown) mounted at the rear of the upper swing body 2. A hoisting rope 8 wound around the equalizer sheave 6 of the A frame 5 and the equalizer sheave 7 of the mast 4, and a pendant device in which one end is connected to the tip of the mast 4 and the other end is connected to the tip of the boom 3. 9 and winding the hoisting rope 8 around the hoisting drum, the rising angle of the boom 3 increases following the angle change of the mast 4, and when the hoisting rope 8 is unwound from the hoisting drum, Of mast 4 To follow the time change upright angle of the boom 3 is smaller.
[0003]
The boom 3 includes a base end boom 3a pivotally supported on the upper swing body 2, a plurality of intermediate booms 3b sequentially connected to the base end boom 3a, and a front end boom 3c connected to the intermediate boom 3b positioned at the foremost end. The pendant device 9 is composed of a plurality of pendant cables 10 connected in series, and the effective length of the boom 3 is adjusted by appropriately increasing or decreasing the number of intermediate booms 3b and pendant cables 10. It can be done.
[0004]
Furthermore, when the number of the intermediate booms 3b is large and the booms 3 are long, the tip part of the mast 4 and a predetermined intermediate boom 3b located at the intermediate part of the boom 3 are connected by the suspended pendant device 11, By means of the hanging pendant device 11, the tension acting on the pendant device 9 is reduced, and deformation due to the weight of the middle part of the boom 3 is suppressed.
[0005]
As shown in FIGS. 6 and 7, the suspended pendant device 11 includes two pendant cables 13 having one end locked to the left and right ends of the mast 4 via pins 12, and the other end of each pendant cable 13. And a crevice 16 having a screw hole 15 connected to the boom 3 and opened to the boom 3 side, and a rear surface (a surface facing the mast 4) of the intermediate boom 3 b, which is locked to the left and right via a pin 17 and mast 4. A bifurcated link 19 having a screw hole 18 opened to the side, a screw portion 20a near one end screwed into the screw hole 15 of the clevis 16, and a screw portion 20b near the other end screwed into the screw hole 18 of the link 19. And a screw 20 of each rod 20 and a screw hole 15 of the clevis 16 to be screwed to the right screw structure, and a screw 20 to the other screw 20b of each rod 20 to be screwed thereto. It has a threaded hole 18 of the click 19 to the left screw structure.
[0006]
In this hanging pendant device 11, when the rod 20 is rotated in the circumferential direction, the screwing amount between the screw portions 20a, 20b and the screw holes 15, 18 increases or decreases, and the effective length of the hanging pendant device 11 is increased. Fine adjustment can be made to correspond to the actual length of each intermediate boom 3b.
[0007]
Note that the pendant cable 13 may be divided into a plurality of parts.
[0008]
[Problems to be solved by the invention]
However, in the pendant pendant device 11 shown in FIGS. 6 and 7, since the pendant cable 13 is long, when the pendant cable 13 is twisted due to vibration or the like, the clevis 16 rotates in the circumferential direction with respect to the rod 20, Thereby, the screwing amount of the screw holes 15 and 18 and the screw portions 20a and 20b decreases, and the effective length of the hanging pendant device 11 may change unexpectedly.
[0009]
The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a suspended pendant device that can prevent an unexpected change in effective length.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention , a pendant cable having one end locked to the left and right of the tip of the mast, and a screw hole connected to the other end of the pendant cable and opening to the boom side are provided. A clevis having a screw hole that is locked to the left and right of the back of the middle portion of the boom in the longitudinal direction and that opens to the mast side, and a screw portion near one end is screwed into the screw hole of the clevis and a screw near the other end A rod whose portion is screwed into the screw hole of the link, and a spreader whose both ends extend substantially horizontally in the radial direction of the pendant cable and whose intermediate portion is bent downward, and one screw portion of each rod and a screw screwed into it and a screw hole for screwing the holes and the to it the other threaded portion of each rod to the right screw structure and a left screw structure, provided substantially horizontally extending bore in the pendant cable radially clevis, the one There in the inserted Chutsu pendant device so as to insert and swinging the other end of the spreader into the hole of the other of the clevis in the circumferential direction so as to swing one end of the spreader in the circumferential direction into the hole of laevis The spreader is inserted into the clevis hole so that the upper horizontal portion at one end can swing in the circumferential direction and the lower horizontal portion at the other end is positioned below the clevis, and the pendant cable diameter And a bar extending substantially horizontally in the direction and connecting the left and right stays .
[0012]
In the invention according to claim 2 of the present invention, the cylindrical roller is rotatably fitted on the bar of the spreader.
[0013]
In either of the hanging pendant devices according to the first and second aspects of the present invention, both ends of the pendant device are inserted in the holes of the clevises in the circumferential direction of the clevis with respect to the rod due to the twist of the pendant cable. Rotation of
[0014]
In addition, by allowing the end of the spreader to swing in the circumferential direction with respect to the clevis hole, the intermediate portion of the spreader is always positioned below the clevis without being affected by the angle at which the boom is raised. Interference between the lifting rope stretched between the base end portion and the tip end portion and the spreader is avoided.
[0015]
Furthermore , the spreader is divided into left and right stays and a bar connecting the stays, thereby facilitating the attachment of the spreader to the clevis.
[0016]
In the hanging pendant device according to claim 2 of the present invention, when the boom is substantially horizontal, the lifting rope is supported by the roller located at the middle portion in the longitudinal direction of the boom.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0018]
FIG. 1 to FIG. 4 show an example of an embodiment of the hanging pendant device of the present invention. In the figure, the same reference numerals as those in FIG. 5 to FIG.
[0019]
The hanging pendant device 21 has two pendant cables 13 whose one ends are locked to the left and right of the tip of the mast 4 and screw holes 22 that are connected to the other ends of the pendant cables 13 and open to the boom 3 side. A clevis 23, a bifurcated link 19 having a screw hole 18 that is locked to the left and right sides of the middle portion of the boom 3 in the longitudinal direction and that opens to the mast 4 side, and a screw portion 20 a near one end are formed in the screw hole 22 of the clevis 23. A threaded portion 20 b that is screwed and close to the other end includes a rod 20 that is screwed into the screw hole 18 of the link 19, a spreader 27, and a roller 28.
[0020]
Each clevis 23, 23 is provided with a hole 24 extending substantially horizontally in the radial direction of the pendant cable 13.
[0021]
The spreader 27 is inserted into the hole 24 so that the upper horizontal portion at one end can swing in the circumferential direction, and the lower horizontal portion at the other end is located on the lower side of the clevis 23. , 25 and a tubular bar 26 that extends substantially horizontally in the radial direction of the pendant cable 13 and connects the lower horizontal portions of the left and right stays 25, 25.
[0022]
Further, the roller 28 is rotatably fitted to the bar 26 of the spreader 27.
[0023]
In the hanging pendant device 21 shown in FIGS. 1 to 4, the rods caused by the twist of the pendant cable 13 by the spreaders 27 in which the horizontal portions at the upper ends of the left and right stays 25, 25 are inserted into the holes 24 of the clevises 23. The circumferential rotation of the clevis 23 relative to 20 is suppressed.
[0024]
Further, the upper horizontal portion of the left and right stays 25, 25 of the spreader 27 with respect to the hole 24 of the clevis 23 is allowed to swing in the circumferential direction, and the bar 26 in the middle portion of the spreader 27 is set to the standing angle of the boom 3. Without being affected, it is always positioned below the clevis 23 to avoid interference between the lifting rope 29 and the spreader 27 stretched between the base end portion and the distal end portion of the boom 3, and the boom 3 is substantially omitted. When horizontal, the elevating rope 29 is supported by a roller 28 that fits around the bar 26 of the spreader 27.
[0025]
As described above, in the suspended pendant device 21 shown in FIGS. 1 to 4, the left and right clevises 23 are connected by the spreader 27 to suppress the rotation of the clevis 23 relative to the rod 20 due to the twist of the pendant cable 13. Therefore, it is possible to prevent the amount of screwing between the screw hole 22 of the clevis 23 and the threaded portion 20a of the rod 20 from decreasing, and the effective length of the hanging pendant device 21 from changing unexpectedly.
[0026]
Further, when the length of the hanging pendant device 21 is adjusted by rotating the rod 20, the rotation of the clevis 23 is suppressed by the spreader 27, so that the pendant cable 13 is not twisted.
[0027]
Furthermore, since the spreader 27 is divided into the left and right stays 25 and the bar 26 connecting the stays 25, the spreader 27 can be easily attached to the clevis 23.
[0028]
The suspended pendant device of the present invention is not limited to the embodiment described above, and various modifications are made without departing from the scope of the present invention, in addition to increasing the number of pendant cables and spreaders. Of course you get.
[0029]
【The invention's effect】
As described above, according to the hanging pendant device of the present invention, the following various excellent effects can be obtained.
[0030]
(1) In any of the suspended pendant devices according to the first and second aspects of the present invention, the spreader inserted into the holes of each clevis has both ends of the clevis attached to the rod due to the twist of the pendant cable. Since rotation in the circumferential direction is suppressed, an unexpected change in the effective length can be prevented.
[0031]
(2) Further, the end of the spreader with respect to the hole of the clevis is allowed to swing in the circumferential direction, and the intermediate portion of the spreader is always positioned below the clevis without being influenced by the standing angle of the boom. Therefore, it is possible to avoid interference between the lifting rope stretched between the base end portion and the distal end portion of the boom and the spreader.
[0032]
(3) Further, since the rotation of the clevis is suppressed by the spreader, it is possible to prevent the pendant cable from being twisted when the length of the hanging pendant device is adjusted by rotating the rod.
[0033]
(4) In addition, since the spreader is divided into the left and right stays and the bar connecting the stays, the spreader can be easily attached to the clevis.
[0034]
(5) In the suspended pendant device according to claim 2 of the present invention, when the boom is substantially horizontal, the lifting rope is supported by the roller located at the middle portion in the longitudinal direction of the boom, so that sliding It is possible to suppress damage to the spreader and the lifting rope due to the above.
[Brief description of the drawings]
FIG. 1 is a side view showing an example of an embodiment of a hanging pendant device of the present invention.
FIG. 2 is a view taken in the direction of arrows II-II in FIG.
FIG. 3 is a front view of a spreader associated with the center pendant device of FIG. 1;
FIG. 4 is a side view of a crawler crane to which an example of an embodiment of the hanging pendant device of the present invention is applied.
FIG. 5 is a side view showing an example of a conventional crawler crane.
6 is a side view of an example of the hanging pendant device related to FIG. 5. FIG.
7 is a VII-VII arrow view of FIG. 6;
[Explanation of symbols]
3 Boom 4 Mast 18 Screw hole 19 Link 20 Rod 20a Screw part 20b Screw part 22 Screw hole 23 Clevis 24 Hole 25 Stay 26 Bar 27 Spreader 28 Roller

Claims (2)

A pendant cable with one end locked to the left and right of the tip of the mast, a clevis having a screw hole connected to the other end of the pendant cable and opening to the boom side, and locked to the rear left and right of the middle part in the longitudinal direction of the boom And a link having a screw hole that is open to the mast side, a rod in which a screw portion near one end is screwed into a screw hole in a clevis and a screw portion near the other end is screwed into a screw hole in the link, and both ends are pendant A spreader extending substantially horizontally in the radial direction of the cable and having an intermediate portion bent downward, wherein one screw portion of each rod and a screw hole screwed to the screw portion have a right-hand thread structure and the other screw portion of each rod and a threaded screw hole and a left screw structure, clevis substantially disposed horizontally extending hole in the pendant cable radially, swings the one end portion in the circumferential direction of the spreader into the hole of one of the clevis obtained Inserted and a pendant device hanging in the inserted so as to swing the other end hole in the spreader of the other clevis circumferentially so, the spreader, the upper horizontal portion of one end in the hole of the clevis The left and right stays are inserted so as to be able to swing in the circumferential direction and the lower horizontal portion at the other end is located below the clevis, and the bar extends substantially horizontally in the radial direction of the pendant cable and connects the left and right stays. A suspended pendant device characterized by being formed . 2. A suspended pendant device according to claim 1, wherein a cylindrical roller is rotatably fitted on a spreader bar .

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