JP2011006199A - Leaving device, crane, and rope wiring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a leaving device, a crane, and a rope wiring method, without risk of damaging a main rope and a hoisting accessory.SOLUTION: A rope guide 20 for guiding a leaving rope 6a reaching a hook sheave 9a, is arranged by laying around along an under surface of a boom 4 from a leaving winch 6 in the tip vicinity of the boom 4. Thus, in leaving work, since the leaving rope 6a and the main rope 5a are pulled out toward an upper part of the hook 9, the leaving work can be performed while erecting the hook 9. Thus, since unreasonable force is not applied to the leaving rope 6a, the main rope 5a and the hook 9, damaging of these can be minimized.

Description

  The present invention relates to a technique for drawing a main rope around a sheave of a hanging tool.

  Leaving work means that when assembling the crane at the work site, the main rope wound around the main winch (main winch) is pulled out to the tip of the boom, and the sheave provided on both the tip of the boom and the hook and other hanging tools Refers to the work of hanging around. Hereinafter, in this specification, the sheave provided at the tip of the boom is referred to as “point sheave”, and the sheave provided in the hanging tool is referred to as “hanging sheave”.

  Conventionally, the reaving work has been performed manually, but at this time, a large number of workers are required. This is because the main rope is somewhat thick and heavy, and the boom length may reach, for example, 60 to 70 m. In other words, pulling the heavy and difficult-to-handle main rope to the tip of the boom is the first difficult task, and then to hang a thick wire rope with high bending rigidity around the point sheave and hanging sheave to some extent on the main rope. It is necessary to apply tension. If this tension is not significantly increased, the above-mentioned sheaves cannot be hung around, and therefore a large number of workers are required.

  In order to solve this problem, as described below, there is also known a method of installing a winching winch (hereinafter referred to as “leaving winch” in the present specification) in the vicinity of a boom mounting portion of a crane body. Yes.

  A reeving winch on which a rope for reving work (hereinafter referred to as a “leaving rope” in this specification) that is thinner than the main rope and easy to handle is wound is installed near the boom mounting portion of the crane body. . In the reeve operation, the operator pulls out the reeve rope from the reving winch along the lower part of the boom, and wires the point sheave and the suspension sheave from the direction opposite to the direction in which the main rope is wound. Further, the reeving rope is pulled out along the upper part of the boom, and the tip of the leaving rope is connected to the tip of the main rope wound around the main winding winch.

  Thereafter, the main rope is guided in the order of the main winding winch → point sheave → hanging sheave →... By driving the reving winch upward and winding the reving rope, thereby completing the wiring of the main rope, that is, the reeve operation. By using the leaving winch in this way, the reeve operation can be performed relatively easily without much labor (see Patent Document 1).

JP 2000-053383 A

  However, in the reeving operation described in the above-mentioned patent document, the hoisting tool indicated by reference numeral 9 is used to wind up the reeving rope drawn out along the lower part of the boom in the lateral direction with a reving winch, as shown in FIG. It is necessary to perform the reeve work in a state where the lay down sideways in advance. In FIG. 6, parts corresponding to the cranes of the embodiment described later are denoted by the same reference numerals as those of the crane of the embodiment described later.

  However, when the reeve operation is performed in such a state that the hanging tool 9 has been laid down in advance, the hanging sheave 9a from the point sheave indicated by reference numeral 14 to the hanging sheave indicated by reference numeral 9a is near the corner of the mouth. Since the main rope is bent unnaturally, the main rope may be damaged.

(1) A reeving device according to a first aspect of the present invention is a reeving winch that winds and unwinds a reeving rope, and a reeving that is provided at the tip of the boom and is routed from the leaving winch along the bottom surface of the boom to reach the sheave of the hanging tool. And a guide for guiding the rope.
(2) A crane according to a fourth aspect of the present invention includes a reving device according to any one of the first to third aspects, a boom, a main winding winch that winds and feeds the main rope, and a main rope. And a hanging tool.
(3) In the rope wiring method according to the fifth aspect of the present invention, a rope that is wound around a reving winch and has a diameter smaller than that of the main rope is provided from the lower surface of the boom to the suspension and the tip of the boom. The top rope is passed through the main winch, the tip of the reeving rope is connected to the end of the main rope wound around the main winch, and the main rope is hung on the sheave of the hanger by winding the reeving rope with the leaving winch. The rotating rope wiring method is characterized in that the leaving rope is routed from the leaving winch to the sheave of the hanging tool via a leaving rope guide provided at the tip of the boom between the top sheave and the base end of the boom.

  According to the present invention, there is no risk of damaging the main rope.

It is a side view of the crane carrying the reeving apparatus by this invention. (A) is a side view of the crane 100 during a reeve operation, (b) is a cross-sectional view taken along arrow A in (a), and shows the structure of the rope guide 20. It is a figure explaining a reeve work. It is a figure explaining a reeve work. It is a figure which shows a modification. It is a figure which shows the state of the hanging tool at the time of the reeve operation | work in a prior art, and a main rope.

  With reference to FIGS. 1-4, one Embodiment of the reeving apparatus and rope wiring method by this invention is described. FIG. 1 is a side view of a crane equipped with a reeving device according to the present invention. The crane 100 is pivotally supported on a traveling body 1, a revolving body 3 that is turnably mounted on the traveling body via a swivel wheel 2, and a frame (revolving frame) of the revolving body 3 so as to be able to undulate in the front-rear direction. Boom 4. The revolving body 3 is provided with a main winding winch (main winch) 5, a leaving winch 6, and a undulating winch 7, and a counterweight 8 is supported at the rear end of the revolving body 3. A main winding rope (main rope) 5 a is wound around the main drum of the main winch 5, a leaving rope 6 a is wound around the leaving drum of the leaving winch 6, and an undulating rope 7 a is wound around the undulating drum of the undulating winch 7. It has been turned. An A frame 30 (also referred to as a gantry) is erected on the revolving structure 3 behind the boom 4.

  A point sheave 14 is provided at the tip of the boom 4, and a guide sheave 15 is provided at the top near the tip of the boom 4. A rope socket mounting portion 16 and a rope guide 20 are provided in the lower portion near the tip of the boom 4. A guide roller 25 is provided at a lower portion in the vicinity of an intermediate position between the distal end portion and the proximal end portion of the boom 4. The rope socket attachment portion 16 is a portion to which a rope socket 17 connected to the tip of the main rope 5a is attached. As will be described later, the rope guide 20 and the guide roller 25 are rollers that guide the reeve rope 6a during a reeve operation.

  The main rope 5a is routed around a sheave (hook sheave) 9a and a point sheave 14 of a hook 9, which is a hanging tool, via a guide sheave 15 in the vicinity of the boom tip. It is attached to the rope socket attachment part 16 via. When the main winch 5 is driven, the hook 9 moves up and down. One end of a pendant rope 11 is connected to the tip of the boom, and the other end of the pendant rope 11 is connected to a bridle 12. A hanger 13 is rotatably attached to the top of the A frame 30, and the hoisting rope 7 a is looped around the bridle 12 and the hanger 13 a plurality of times via a sheave 32 at the top of the A frame. When the hoisting drum 7 is driven in this state, the interval between the hanger 13 and the bridle 12 is changed, and the boom 4 is hoisted via the pendant rope 11.

--- About rope guide 20 and guide roller 25 ---
FIG. 2A is a side view of the crane 100 during a reeve operation which will be described in detail later. FIG. 2B is a cross-sectional view taken along arrow A in FIG. 2A and shows the structure of the rope guide 20. The rope guide 20 includes a shaft 21 inserted through holes 4 a provided in the left and right frames of the boom 4, and a hollow shaft 22 pivotally supported by the shaft 21 between the left and right frames of the boom 4. Have The shaft 21 is provided with a stopper 23 so that the shaft 21 and the hollow shaft 22 do not fall off the boom 4. Since the shaft 21 is attached near the tip of the boom 4, it is desirable that the shaft 21 be lightweight. Therefore, the shaft 21 may be formed of a hollow shaft member. Further, the length of the hollow shaft 22 is appropriately set so that the reeving rope 6 a is not sandwiched between the left and right frames of the boom 4 and the end surface of the hollow shaft 22.

  As described above, the rope guide 20 is provided in the vicinity of the rope socket mounting portion 16 at the lower portion near the tip of the boom 4. As will be described later, when the main rope 5a is pulled by the reeve rope 6a in the reeve operation, the reeve rope 6a and the main rope 5a are pulled by pulling the reeve rope 6a and the main rope 5a upward from the hook 9. This is to prevent the hooking sheave 9a from hitting the mouth of the hook sheave 9a and damaging the leaving rope 6a, the main rope 5a, and the hook 9. Further, the rope guide 20 prevents the crane 9 from being hindered, and prevents the rope guide 20 from being damaged. It is provided at a position where the suspended main rope 5a does not hit.

  As described above, the guide roller 25 is provided in the lower portion near the intermediate position between the distal end portion and the proximal end portion of the boom 4 and prevents the leaving rope 6a from coming into contact with the boom 4 during the leaving operation. The guide roller 25 has the same structure as the rope guide 20.

--- Leaving work ---
In the crane 100 configured as described above, when the crane 100 is assembled at the work site, the reeve operation is performed as follows. With reference to FIG. 3 and FIG. Immediately before the start of the leaving operation, as shown in FIG. 3A, the main rope 5a and the leaving rope 6a are wound around the main winch 5 and the leaving winch 6. In the leaving operation, the boom 4 of the crane 100 is first tilted forward so that the tip of the boom 4 is close to the ground. At this time, the hook 9 is left standing on the ground. Then, the position of the crane 100 or the hook 9 is adjusted so that the point sheave 14 is positioned substantially immediately above the hook 9.

  Next, as shown in FIG. 3 (b), the reeving winch 6 is driven to unwind the reving rope 6 a, pulled forward along the lower part of the boom 4, and from above the guide roller 25 to above the rope guide 20. Thread around the hook sheave 9a and the point sheave 14 from the rope guide 20 downward. The order and direction in which the leaving rope 6a is passed through each part are opposite to the order and direction in which the main rope 5a is passed through each part. This is because when the main rope 5a is guided by the leaving rope 6a, the main rope 5a guides each part in the correct order and direction.

  Further, the reeving winch 6 is driven, and the reeving rope 6a hung around the point sheave 14 is pulled out to the vicinity of the main winch 5 through the guide sheave 15, and as shown in FIG. Connect to the tip of 5a. Then, the main winch 5 is driven to feed out the main rope 5a at a predetermined speed, and the reving winch 6 is driven to wind the reving rope 6a. As a result, the main rope 5 a is guided by the reeve rope 6 a and hung around the hook sheave 9 a and the point sheave 14 via the guide sheave 15.

  By guiding the main rope 5a with the reeve rope 6a passing above the rope guide 20 in this way, the reeve rope 6a and the main rope 5a are pulled out above the hook 9, so that the reeve rope 6a and the main rope 5a are It is possible to prevent the hook sheave 9a from hitting the opening. In addition, since the reeving rope 6a and the main rope 5a are pulled out upward from the hook 9 where the standing rope 5a stands, the force for defeating the hook 9 hardly acts and the hook 9 is kept standing stably. can do.

  As shown in FIG. 4 (a), when the connecting portion between the leaving rope 6a and the main rope 5a is guided to the vicinity of the rope guide 20, the main winch 5 and the leaving winch 6 are stopped, and FIG. As shown, the connection between the leaving rope 6a and the main rope 5a is released. Then, as shown in FIG. 4C, the tip of the main rope 5 a is connected to the rope socket 17, and the rope socket 17 is attached to the rope socket attachment portion 16. Then, the reeling rope 6 a being unwound is wound up by the leaving winch 6. This is the end of the reeve operation.

The crane 100 described above has the following effects.
(1) A rope guide 20 is provided in the vicinity of the tip of the boom 4 so as to guide the reving rope 6a drawn from the reving winch 6 along the lower surface of the boom 4 to the hook sheave 9a. Thereby, at the time of a reeve operation | work, since the reeve rope 6a and the main rope 5a are pulled out toward the upper direction of the hook 9, a reeve operation | work can be performed with the hook 9 standing. Therefore, the reeving rope 6a and the main rope 5a can be prevented from hitting the opening of the hook sheave 9a, and since an excessive force is not applied to the leaving rope 6a, the main rope 5a and the hook 9, they are prevented from being damaged. it can.

  In addition, since the reeving rope 6a and the main rope 5a are pulled out upward from the hook 9 on which the standing rope 6a stands, almost no force is exerted to bring down the hook 9, and the hook 9 can be safely kept upright. Can be used to leave. Furthermore, since there is no difficulty in the way of passing the leaving rope 6a and the main rope 5a, it is not necessary to reduce the speed of passing the leaving rope 6a and the main rope 5a more than necessary at the time of the leaving work, and the leaving work can be performed efficiently. In addition, since the reeving operation can be performed with the hooks 9 being upright, it is not necessary to erect the hooks 9 lying down after the releaving operation. As a result, it is possible to prevent damage to the hook 9 and the main rope 5a that may occur when the hook 9 is laid sideways.

(2) The rope guide 20 is configured to be provided in the vicinity of the rope socket mounting portion 16. As a result, the reeving rope 6a and the main rope 5a are pulled out from the hook sheave 9a toward the rope guide 20 that has substantially the same positional relationship as the positional relationship between the hook 9 and the rope socket mounting portion 16 during crane operation. Therefore, excessive force is not applied to the leaving rope 6a, the main rope 5a, and the hook 9, and damage to these can be prevented as much as possible. Further, since the leading end of the main rope 5a is pulled out in the vicinity of the rope socket attachment portion 16 to which the main rope 5a is attached via the rope socket 17 by the reeve operation, the attachment operation to the rope socket attachment portion 16 becomes easy and efficient. .

(3) The rope guide 20 is configured to be provided at a position where the main rope 5a hanging the hook 9 does not hit even when the boom 4 is raised to an inclination angle of about 80 degrees, for example. Thereby, contact and interference with the rope guide 20 and the main rope 5a can be prevented in the crane work, the crane work is not hindered, and the rope guide 20 can be prevented from being damaged.

---- Modified example ---
(1) Although the leaving winch 6 is provided on the revolving structure 3 in the above description, the present invention is not limited to this. For example, as shown in FIG. 5, the leaving winch 6 may be provided on the boom 4 side, and the same effects as the above-described effects can be obtained. In consideration of avoiding an increase in weight on the front end side of the boom 4 and supplying pressure oil to the reving winch 6 from the revolving body 3 side, the leaving winch 6 is located near the base end side of the boom 4. It is desirable to provide it.

(2) In the above description, the rope guide 20 is configured to be provided in the vicinity of the rope socket mounting portion 16, but the present invention is not limited to this. For example, when the main rope 5a is pulled in with the leaving rope 6a in the reeve operation, the leaving rope 6a and the main rope 5a are connected to the hook 9 so that the leaving rope 6a and the main rope 5a do not hit the opening of the hook sheave 9a. If it can be pulled out upward, it can be provided at any position near the tip of the boom 4. In addition, when pulling in the main rope 5a with the leaving rope 6a, a moment to cause the hook 9 to fall over is caused by the pulling force of the leaving rope 6a so that the leaving work can be stably performed with the hook 9 standing. Considering a certain safety factor, it is necessary to determine the installation position of the rope guide 20 so that the standing hook 9 is smaller than the moment at which the hook 9 starts to fall. In addition, the rope guide 20 has no hindrance to the crane work, and in order to prevent the rope guide 20 from being damaged, for example, the main rope that suspends the hook 9 even when the boom 4 is raised to an inclination angle of about 80 degrees. It is desirable to be provided at a position where 5a does not hit.

Further, the rope guide 20 is attached to the rope socket attachment portion 16 to perform the reeve operation. After the reeve operation is completed, the rope guide 20 is removed from the rope socket attachment portion 16 and the tip of the main rope 5a is connected to the rope via the rope socket 17. You may make it attach to the socket attaching part 16. FIG.
(3) You may combine each embodiment and modification which were mentioned above, respectively.

  The present invention is not limited to the embodiment described above, and is provided at the tip of the boom by winding and unwinding the reeving rope, and is hung from the leaving winch along the bottom surface of the boom. And a guide for guiding a leaving rope leading to the sheave of the tool, and a cleaving device having various structures, and a crane having various structures having the leaving device. Further, the present invention is not limited to the above-described embodiment, and a rope that is wound around a reving winch and has a diameter smaller than that of the main rope is connected to the hanger and the boom from the lower surface of the boom. The main rope is routed to the main winch through the top sheave provided at the tip of the main rope, the tip of the reeving rope is connected to the tip of the main rope wound on the main winch, and the main rope is suspended by winding the reeving rope with the leaving winch In the rope wiring method that hangs around the sheave of the implement, the reving rope is routed from the leaving winch to the sheave of the lifting device via the reving rope guide provided at the tip of the boom between the top sheave and the base end of the boom. Includes various rope wiring methods characterized .

DESCRIPTION OF SYMBOLS 1 Traveling body 2 Swivel wheel 3 Swivel body 4 Boom 5 Main winding winch (main winch) 5a Main winding rope (main rope)
6 Leaving winch 6a Reving rope 9 Hook 9a Hook sheave 14 Point sheave 15 Guide sheave 16 Rope socket mounting part 17 Rope socket 20 Rope guide 25 Guide roller 100 Crane

Claims (5)

A leaving winch for winding and unwinding the leaving rope;
A reeving device comprising: a guide provided at a tip of the boom, and a guide for guiding the reeving rope that is routed along the bottom surface of the boom from the reving winch to reach a sheave of a hanging tool. The reeving device according to claim 1, wherein
The said guide is provided in the attachment position vicinity of the edge part of the main rope wound up and drawn | fed out by the main winding winch, The reeving apparatus characterized by the above-mentioned. The reeving device according to claim 2, wherein
The reeving device according to claim 1, wherein the guide is provided at a position that does not interfere with the main rope even when the boom is raised. The reeving device according to any one of claims 1 to 3,
The boom,
A main winding winch for winding and unwinding the main rope;
A crane comprising: a hanging tool around which the main rope is hung. A rope that is wound around a reving winch and that is smaller in diameter than the main rope is routed from the lower surface of the boom to the main winch through a suspension and a top sheave provided at the tip of the boom, and the reving rope In the rope wiring method of connecting the tip of the main rope that is wound around the main winch and winding the main rope around the sheave of the hanging tool by winding the leave rope with the leaving winch.
Rope wiring, wherein the rope is routed from the leaf winch to the sheave of the suspension via a leaf rope guide provided at a tip of the boom between the top sheave and a base end of the boom. Method.

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