JPH11100189A - Lifting cargo inching device of crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lifting cargo inching device which enables delicate position adjusting work of a cargo to be lifted, provides high reliability with respect to its strength and structure, and has long service life. SOLUTION: An idler sheave drive cylinder 13 is attached to a boom 53 in the orthogonal direction for the longitudinal direction of the boom 53 so as to turn a cylinder side thereof freely, and an idler sheave 55 is connected with a rod side of the cylinder 13 so as to rotate freely around a sheave pin 12. A rope 62 is stretched between a point sheave 56 and the idler sheave 55, and this rope 62 suspends and holds a hook 54 in a tip part of the boom 53. When the inching operation is done in lifting a cargo, the cylinder 13 is expanded and shrunk in the arrow A direction so that the hook 54 moves in the arrow B direction and delicate inching (position adjustment) operation of a cargo to be lifted becomes possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load inching device for a crane.

[0002]

2. Description of the Related Art An example of a conventional crane will be described below with reference to FIG. Reference numeral 5 shown in FIG.
Reference numeral 1 denotes a lower traveling body, and the lower traveling body 51 is provided with a pair of crawlers 51a. Each crawler 51a is composed of a track frame 51b, an idler wheel 51c and a traveling motor 51d which are mounted on the front and rear ends thereof, and a shoe 51e wound around the idler wheel 51c and the traveling motor 51d. The lower traveling body 51
An upper revolving structure 52 is rotatably mounted on an upper portion of the upper revolving structure 52. An operator cab 52b having a window 52a is provided on an upper portion on one side of the upper revolving structure 52. Also,
A counterweight 52c is provided at the rear end of the upper swing body 52.
Is installed. A winch 52e is mounted at a position closer to the cab 52b than the counterweight 52c. One end of a tension member 64 is rotatably mounted above the rear part of the upper swing body 52. A sheave 57 is rotatably attached to the other end of the tension member 64.
A boom 53 is provided beside the operator's cab 52b so as to be able to move up and down with a boom foot pin 52d as a fulcrum. A link 61 is fixed near the tip of the boom 53, and one end of the guy line 60 is connected to the link 61. The other end of the guy line 60 is connected to the upper spreader sheave 58. A rope 66 is wound between the upper spreader sheave 58 and the lower spreader sheave 59. In addition, rope 66
Is wound around the winch 52e via the sheave 57. By winding and rewinding the winch 52e,
The boom 53 is raised. A hook 54 is arranged at the tip of the boom 53, and the hook 54 is lifted or suspended by operating the winch 63. The rope 62 fed out from the winch 63 is
The hook 54 is reached via an idler sheave 55 and a point sheave 56 rotatably mounted near the tip of the boom 53. The crane operator performs a traveling operation and a crane operation of the crawler crane in the cab 52b. In the mobile crane described above, by operating the winch 63, the rope 62 can be wound and unwound, the hook 54 can be moved in the direction of the arrow J, and the suspended load can be inched.

FIG. 6 shows an example of a conventional suspended load inching apparatus disclosed in Japanese Patent Application Laid-Open No. 8-73184. Hereinafter, the configuration will be briefly described. A hook 72 is arranged at the tip of the boom 71. A rope 73 protruding from the winch includes an idler sheave 74 and a point sheave 75 rotatably mounted near the tip of the boom 71.
And a sheave 76 rotatably mounted in the hook 72, and connected to the rod side of the cylinder 77. The cylinder side of the cylinder 77 is rotatably connected to a boom 71 by a pin 78. By adjusting the extension of the rope 73 by extending and contracting the cylinder 77, the position of the hook 72 can be adjusted (inching operation).

[0004]

Generally, when operating a crane at a construction site or the like, it is required to finely adjust the position of a suspended load (inching operation). In particular, when performing bolt adjustment of a suspended load in construction work, it is necessary to move the suspended load up and down a small distance and insert a bolt.

[0005] In the general crane shown in FIG.
The inching operation of the suspended load was performed by winding and unwinding the rope by the winch. However, when performing inching by winding and unwinding the rope, delicate operation of the suspended load could not be performed because of the low responsiveness required for inching. For this reason, there has been a problem that work requiring a delicate operation such as bolt adjustment cannot be easily performed.

FIG. 6 shows a hanging load inching device which solves the problems of the prior art shown in FIG. 5 to some extent. However, since the structure is such that the rope and the cylinder are directly connected to each other, When the load sways, the influence of the rope dancing and swaying is directly applied to the cylinder, and the connection between the cylinder and the boom causes a backlash due to vibration, and there is an anxiety in terms of strength and structure. Particularly, every time a suspended load is lifted into the air, a large force is momentarily applied to the cylinder every time, and thus there is a problem that the life of the cylinder is greatly impaired.

The present invention has been made in view of the above circumstances, and has as its object to provide a suspended load inching device which can perform a delicate position adjustment operation of a suspended load, is reliable in strength and structure, and has a long life. Aim.

[0008]

According to the first aspect of the present invention, a rope pulled out from a winch is passed over a point sheave rotatably mounted near a tip end of a boom and connected to the rope. In a load inching device of a crane for hanging a hook from the point sheave and vertically inching a load suspended from the hook, the crane is disposed between the point sheave and the winch, and the rope is hung. An inching means is provided for changing the tension of the rope by moving the position of the passed sheave by a cylinder and inching the suspended load up and down.

According to the first aspect of the present invention, since the tension of the rope is changed by moving the position of the sheave over which the rope is hanged, and the suspended load is inched up and down, it is possible to respond immediately. Highly efficient inching operation can be performed.

[0010] Further, since the rope and the cylinder are connected via the sheave, the rope is less susceptible to the dance and swing of the rope during the inching operation of the suspended load, and has high reliability in terms of strength and structure. Life can be extended.

In the invention described in claim 2, claim 1 is
The inching device for a crane according to claim 1, wherein the inching means is rotatably disposed on a back surface near a tip end of the boom, and is provided between the idler sheave and the boom. And an idler sheave drive cylinder that can move the idler sheave toward and away from the back of the boom.

In this case, a highly reliable hanging load inching device can be constructed by partially changing the existing structure and adding a cylinder. Therefore, it is advantageous in terms of cost.

[0013] According to the third aspect of the present invention, the first aspect is provided.
The inching device according to claim 1, wherein the inching means includes a link having one end rotatably attached to a back surface near a tip end of the boom, and a rotatably disposed near an intermediate portion of the link. An idler sheave on which a rope is laid, and disposed between the other end of the link and the boom, and the idler sheave comes into contact with and separates from the boom about a mounting position of the link to the boom as a rotation center. And a link drive cylinder movable in the direction.

[0014] In this case, since the link acts as a lever, a small cylinder can be used and an existing bracket can be used as the link.
This is advantageous in cost.

According to the invention described in claim 4, according to claim 1 of the present invention,
The lifting inching device for a crane according to any one of the preceding claims, wherein the inching means is rotatably disposed on a back surface near a tip end of the boom, and rotates between the idler sheave and the winch. An inching sheave on which the rope is freely laid and the rope is wound, and an inching sheave drive cylinder disposed between the inching sheave and the boom and movable in a direction of moving the inching sheave toward and away from the back of the boom. It is characterized by consisting of.

In this case, the restriction on the mounting position of the hanging load inching device to the boom is reduced, and the degree of freedom in design is increased. Further, the piping to the inching sheave drive cylinder can be shortened.

According to the fifth aspect of the present invention, a rope pulled out from a winch is wrapped around a point sheave rotatably mounted near the tip of the boom, and a hook connected to the rope is moved from the point sheave to the point sheave. In a suspended load inching device for a crane that suspends and suspends a suspended load suspended on the hook in a vertical direction, the point sheave is moved between the point sheave and the boom with respect to a tip end of the boom. A point sheave drive cylinder for changing the tension of the rope by moving the rope in the vertical direction and inching the suspended load up and down.

In this case, a highly reliable hanging load inching device can be constructed by partially changing the existing structure and adding a cylinder. Therefore, it is advantageous in terms of cost.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a crane hanging inching device will be described below with reference to FIGS. In addition,
1 to 4, the same components as those of the crane hanging inching device according to the conventional example shown in FIG. 5 will be described with the same reference numerals.

First, a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is an enlarged side view of the tip of the crane boom shown in FIG.

A point sheave 56 is rotatably mounted around the sheave pin 11 on the lower surface near the tip of the boom 53. A pair of idler sheave drive cylinders 13 is attached to the boom 53 so that the cylinders can rotate freely in a direction perpendicular to the longitudinal direction of the boom 53. A sheave 55 is rotatably connected around the sheave pin 12. A rope 62 is hung between the point sheave 56 and the idler sheave 55, and the rope 62 is connected to a hook 54 at the tip of a boom 53.
Is suspended.

If it is desired to perform an inching operation during the load operation, the idler sheave drive cylinder 13 is extended and contracted in the direction of arrow A, and the hook 54 moves in the direction of arrow B, and the subtle movement of the load is achieved. Inching operation becomes possible.

Although the idler sheave 55 is directly attached to the rod of the idler drive cylinder 13 in the embodiment shown in FIG. 1, it goes without saying that it may be attached via a link or the like.

Next, a second embodiment of the present invention will be described with reference to FIG. On the lower surface near the tip of the boom 53,
A point sheave 56 is rotatably attached by a sheave pin 11. A triangular link 25 is provided on the upper surface near the tip of the boom 53. An idler sheave 55 is rotatably connected to an intermediate portion of the link 25 around the sheave pin 23. In the link 25, when the connection portion with the sheave pin 23 is viewed as one vertex of a triangle, the vertex located on the tip side of the other boom is rotatably attached to the vicinity of the upper surface of the tip portion of the boom 53 by the pin 21. Have been. The apex located on the proximal end side of the other boom is located near the upper surface of the distal end of the boom 53 and proximal to the pin 21, and the pin 22 is located on the rod side of the link drive cylinder 24. Is attached so as to be rotatable. Further, a rope 62 is hung between the point sheave 56 and the idler sheave 55, and the rope 62 hangs a hook 54 from the tip of the boom 53.

When the link drive cylinder 24 is extended and contracted in the direction of arrow C, the link 25 rotates about the pin 21 as shown by arrow D. By this rotation, the idler sheave 55 moves up and down, and the tension of the rope 62 changes,
The hook 54 moves up and down in the direction of arrow E. Thereby, the inching operation of the suspended load can be performed.

In the embodiment shown in FIG. 2, the shape of the link is triangular for the sake of explanation. However, if a similar effect is shown, the shape of the link need not be triangular, but may be a bar or a semicircle. There may be.

Further, a third embodiment of the present invention will be described with reference to FIG. On the upper surface near the tip of the boom 53,
An idler sheave 55 is rotatably mounted around the sheave pin 12. Further, a pair of point sheave driving cylinders 32 are disposed horizontally in the longitudinal direction of the boom 53.
Is attached to the lower surface of the boom 53. A point sheave 56 is rotatably mounted around the sheave pin 31 on the rod side of the point sheave drive cylinder 32. Further, a rope 62 is hung between the point sheave 56 and the idler sheave 55, and the rope 62 hangs a hook 54 from the tip of the boom 53.

If the point sheave drive cylinder 32 is expanded and contracted in the direction of arrow F, the point sheave 56 changes the tension of the rope 62, and the hook 54 moves in the direction of arrow G. Adjustments can be made.

FIG. 3 shows a state in which the boom 53 is substantially horizontal.
When the extension 2 is extended or retracted, the suspended load also moves a considerable amount in the left-right direction. However, in an actual crane operation, the suspended load is almost vertically inched in the vertical direction since the boom 53 is set up almost vertically.

Next, a fourth embodiment of the present invention will be described with reference to FIG. A rope 62 drawn out from a winch 63 reaches a hook 54 via an idler sheave 55 and a point sheave 56 rotatably attached to an upper surface and a lower surface in the vicinity of a tip end of a boom 53, respectively. At an arbitrary position between the winch 63 and the idler sheave 55,
An inching sheave drive cylinder 43 is mounted perpendicular to the longitudinal direction of the boom 53, and the inching sheave 41 is rotatably mounted on the rod side of the inching sheave drive cylinder 43 around the inching sheave pin. A rope 62 is also laid over the inching sheave 41.

When the inching sheave drive cylinder 43 is expanded and contracted in the direction of arrow H, the tension of the rope changes,
The hook 54 moves in the direction of arrow I. Thereby, the inching operation of the suspended load can be performed.

In each of the first and third embodiments, a pair of cylinders (idle sheave driving cylinder 13 and point sheave driving cylinder 32) is used. Can be changed as appropriate.

Although the first to fourth embodiments have been described with reference to a crawler crane provided with a lattice boom, the present invention can be applied to other cranes.
That is, the invention can be applied to a wheel crane represented by a raphtalane crane, a fixed crane, and a shipboard crane.

[0034]

As described above, according to the first aspect of the present invention, the inching operation with high responsiveness can be performed, and the rope is less susceptible to the dancing and swinging during the inching operation of the suspended load. In addition, it is possible to obtain an extremely excellent effect that the reliability is high in terms of strength and structure, and the life of the cylinder can be extended.

Further, the invention described in claim 2 can constitute a highly reliable hanging load inching device by partially changing the existing structure and adding a cylinder, and is advantageous in terms of cost. is there.

Further, according to the invention described in claim 3, since the link acts as a lever, a small cylinder can be used, and an existing bracket can be used as the link. It is advantageous in terms of aspect.

Further, in the invention described in claim 4, the restriction on the mounting position of the hanging load inching device to the boom is reduced, and the degree of freedom in design is increased. Further, the piping to the inching sheave drive cylinder can be shortened.

Further, the invention described in claim 5 can form a highly reliable hanging load inching device by partially changing the existing structure and adding a cylinder, and is advantageous in terms of cost. is there.

[Brief description of the drawings]

FIG. 1 is a side view showing a first embodiment of the present invention.

FIG. 2 is a side view showing a second embodiment of the present invention.

FIG. 3 is a side view showing a third embodiment of the present invention.

FIG. 4 is a side view showing a fourth embodiment of the present invention.

FIG. 5 is a side view of a conventional crane.

FIG. 6 is a side view of a conventional inching device.

[Explanation of symbols]

 13: Idler sheave drive cylinder 24: Link drive cylinder 25: Link 32: Point sheave drive cylinder 41: Inching sheave 43: Inching sheave drive cylinder 53: Boom 54: Hook 55: Idler sheave 56: Point sheave, 62: Rope 63: winch,

Claims (5)

[Claims] 1. A rope pulled out from a winch is wrapped around a point sheave rotatably mounted near a tip end of a boom, and a hook connected to the rope is hung from the point sheave and hung on the hook. In a crane lifting inching device for vertically inching a lowered load, the crane is disposed between the point sheave and the winch, and the position of the sheave on which the rope is bridged is moved by a cylinder to move the sheave. A load inching device for a crane, comprising: inching means for changing the tension of a rope to inch the suspended load up and down. 2. The idler sheave, wherein the inching means is rotatably disposed on a back surface near a tip end of the boom, and the idler sheave is provided between the idler sheave and the boom, and the idler sheave is disposed between the idler sheave and the boom. 2. A lifting inching device for a crane according to claim 1, further comprising an idler sheave drive cylinder movable in a direction approaching and separating from a back surface of the boom. 3. A link having one end rotatably attached to a back surface near the tip of the boom, and an idler that is rotatably disposed near the middle of the link and around which the rope is hung. A sheave, and a link disposed between the other end of the link and the boom, the idler sheave being movable in a direction in which the idler sheave comes in contact with and separates from the boom about a mounting position of the link to the boom as a rotation center. The lifting load inching device for a crane according to claim 1, further comprising a driving cylinder. 4. An idler sheave in which said inching means is rotatably disposed on a back surface near a tip end of a boom and on which said rope is hung, and said inching means is rotatably disposed between said idler sheave and a winch. An inching sheave over which a rope is wound, and an inching sheave drive cylinder disposed between the inching sheave and the boom and movable in a direction of moving the inching sheave toward and away from the back surface of the boom. The lifting load inching device for a crane according to claim 1. 5. A point sheave rotatably mounted near the tip of a boom is hung with a rope fed out of a winch, and a hook connected to the rope is hung from the point sheave and hung on the hook. In a lifting load inching device of a crane for vertically inching the lowered load, the point sheave is moved between the point sheave and the boom in a direction of coming and going with respect to a tip end of the boom. A lifting load inching device for a crane, comprising a point sheave drive cylinder for changing the tension of a rope to inching the lifting load vertically.