JPH0445098A - High lift construction crane - Google Patents

Abstract

PURPOSE:To make winding smooth enough by installing a winding rope guide sheave additionally in the upper part of a jib supporting frame erected above a turning part, circling this guide sheave, and making the winding rope so as to be wound on a take-up reel within a plate angle limiting range. CONSTITUTION:A tip of a winding rope 28 is connected to a connector 35' of a hook block 35 and the other part circles round each of sheaves 32, 32 installed in the tip of a jib 16, and further circling round sheaves 33, 33 installed the top of a jib supporting frame 20, and is reached to a load side drum 26' of a winding machine 26. In addition, the winding rope circles round so as to be wound on each reel of a take-up reel 27 by way of a guide sheave 34 installed at the backside on top of the frame 20. Then, an overload detecting limit switch 31 is installed in a range from the load side drum 26' of the winding machine 26 with either a left-lay rope or a right-lay rope in the winding rope 28 to the jib supporting frame top sheave 33.

Description

[Detailed Description of the Invention] Industrial Field of Application: The present invention relates to a high-lift construction crane, which enables a hoisting machine mounted on the main body of the crane to easily handle hoisting ropes. Concerning configuration.

Background and problems of the invention: In construction cranes, a hoisting machine is mounted on the crane body to operate the hoisting rope (also called a sling) used for unloading of materials, etc. . In addition, due to recent remarkable advances in construction technology and soaring land prices, more and more skyscrapers are being constructed in urban areas, and the cranes used to do so are also equipped with the ability to lift materials at high heights. It's starting to be demanded.

However, as a crane capable of carrying out such high-lift work, it is necessary that the hoist installed thereon has a high-height capability. However,
As a hoisting machine, the hoisting rope is wound onto a winding drum to lift a load such as materials, so the amount of winding is large. This winding machine with a large winding amount has a large winding drum, and in other words, it is important to avoid winding the winding rope excessively around the winding drum. However, if the number of winding stages becomes too large, a load will always be applied to the cable, and the upper layer of cable will sink into the first layer of cable.This will increase the resistance when unwinding, causing the strands to There are many drawbacks such as damage and inability to draw out smoothly.

Problem to be solved: In such a situation, it is possible to unwind a long rope without winding it under load, and to perform winding operations. Attempts to install a lifter have failed. In this endless hoisting machine, traction is obtained by winding the hoisting cable multiple times around two drums that are usually arranged in parallel at appropriate intervals, and the so-called no-load side of the hoisting rope is It has a structure in which the cable is wound up and let out by a take-up reel while being applied with a predetermined tension force, and the cable that is not directly involved in the load side is accommodated.

However, as a hoisting machine that can be mounted on a super high-rise construction crane, it must be mounted on the crane's swivel, so the installation space is limited and there may be problems. As the length of the rope that is wound on the winding drum or winding reel increases, the winding diameter, that is, the number of winding steps, will naturally become larger than the normal handling number, resulting in irregular winding, and the winding and unwinding. It is also inconvenient.

Therefore, the present invention is equipped with a high-lift hoisting machine to prevent irregular winding when winding up the unloaded side rope from the hoisting machine on the winding reel of the hoisting cable in a construction crane. to ensure smooth winding work at all times.
It is intended for high-lift construction cranes.

Means for Solving the Problems: The present invention provides a high-lift construction crane with an endless hoist installed above a jib support frame erected above a swing part and at a proper position on a swing structure of the crane body. A guide pulley is attached for the hoisting cable to be wound up and let out from the no-load side, and the guide pulley is wound around the hoisting reel so that the hoisting cable is wound around the take-up reel within the fleet angle limit range.

The endless hoisting machine mounted on the crane main body according to the present invention handles two hoisting cables: an S-strand cable and a Z-strand cable.
The book cables can be driven at the same time, and the book cable can be driven at the same time.

Note that the high-lift construction crane of the present invention includes not only a climbing crane but also a construction frame-mounted crane, and in the case of a jib hoisting crane, the hoisting rope is Preferably, a winding/unwinding guide pulley is attached to the top of the jib support frame. Further, in the case of a horizontal jib type crane, it is preferable that the hoisting cable is attached to a member from which the winding/feeding guide pulley for the take-up reel projects toward the counter jib side at the top of the jib support frame.

Function: In a high-lift construction crane configured in this way, when the eight hoisting ropes are operated by an endless hoisting machine to unload materials, etc., the hoisting machine is especially susceptible to damage caused by the hoisting operation. The cable that is let out to the load side first goes around the first guide pulley attached to the top of the jib support frame and is far away from the take-up reel, and is then wound around the take-up reel, which limits the fleet angle. The value falls within the range, so even if the cable is wound in multiple layers on a reel, the cable will be wound in an orderly manner without any large tensile force acting on the cable on the reel, allowing for smooth operation without being wound erratically. . In addition, by guiding the unloaded side of the hoist to the guide pulley attached to the top of the jib support frame for winding and unwinding, the endless hoist can be mounted and used even in narrow spaces. can do.

If the above-mentioned endless hoisting machine is equipped with one that simultaneously drives two hoisting ropes, S-twist and Z-twist, the hoisting rope will move from the tip of the jib to the hook block during high-lift landing work. It is possible to prevent twisting in the hanging part, allowing for smoother landing operations.

Effect of the invention: According to the present invention, when handling hoisting ropes, no matter how high the working lifting height becomes, an endless type hoisting machine is mounted on the crane body, and the rope can be wound up and carried out on the no-load side of the crane. It is now possible to reliably carry out G4 lifting with a take-up reel, and it is now possible to handle extremely high-lift work using a crane installed on a building frame, etc., without any problems, especially for S-strand. By using two hoisting cables with 1 and 7 strands, it is possible to prevent the hanging items from rotating due to twisting of the cables during the landing and drooping section, making it possible to work even more smoothly at higher heights. 8 Examples: Examples of the construction clay of the present invention will be described below with reference to the drawings.

1 and 2 show a jib hoisting construction crane 10, in which 1] is a tower, 12 is an outer mast,
13 is a climbing device, 14 is a turning mechanism 15, and L7
The crane body is supported on the top of the outer mast 12.

16 is the rotation of the crane body 14! This is a jib whose proximal end is pivoted on i1.7 and is made to undulate by means of undulating cables 18. 20 is a jib support frame.

25 is a jib hoisting winch that operates the hoisting rope [8]. 2G is an endless winding machine with two drums 26'
, 26'', an S-twist cable and a Z-twist cable are wound around each other and driven synchronously.

Reference numeral 27 denotes a take-up reel for the winding cable, which has a structure capable of separately winding the S-twisted cable and the Z-twisted cable.

Reference numeral 28 is a coiled cable, which uses one S-twisted cable and one Z-twisted cable.

As shown in FIG. 3C, the hoisting cable 28 has its tip connected to a hook block 35 via a connector 35'' 2, and the external force is provided at the side of the tip of the jib 16 (slender pulleys). 32
．． 32, and the load side drum 26 of the hoist 26 around the pulley 33 and 33 attached to the top end of the jib support frame 20.
After passing around each guide pulley 34 attached to the rear side of the top of the jib support frame 20 from the no-load side drum 20'' of the hoisting machine 26, winding is performed on each reel of the take-up reel 27. The hook is wrapped around so that it can be taken off.Then, the hoisting cable 2
Winding machine 2 for either S-strand cable or 2-strand cable of 8
6 Negative side drum 26° is connected to a limit switch-J-31 for overload detection via a pulley 3G at a proper position at a pulley 33:4 on the top of the jib support frame. In addition, pulleys 32 provided on both sides of the tip of the jib
．． At the part of the coiled rope 28 hanging from the hook block 32, S and 7-stranded cables are lined up and hung down to the connecting tool 35 of the hook block 35. Each of the guide pulleys 34 is configured so that the twist caused by the twisting of the cable is canceled out by the two, and materials, etc. are suspended by the hook block 35.As illustrated in FIG. It is located above where the T-degree winding machine 26 and the take-up reel 27 are installed,
Although the winding line 28 is wound around each reel of the winding reel 27, the winding lines 28 are related to each other so that the fleet 7" angle is within 2". Even if the cable is wrapped around the take-up reel 27 in multiple stages,
It will be wrapped neatly without any positional deviation. 7.As is well known, this winding-l
The 27th paste is the same as that of the Torquemo evening.

The winding rope (winding rope 28) is wound with a predetermined tension, and on the winding reel side, the winding rope 28 is wound with a predetermined tension.
8 is directly affected by the load when unloading materials, etc.

Therefore, the winding cable 28 can be easily wound up to the winding limit of the reel. Also, the winding machine 26 is unrolled from the non-load side [1, the winding position 1 and the guide pulley 4].
Because there is a sufficient distance "C" in relation to Guaranteed.

,: In the present invention, the accompanying four-way winding rope 28 is processed by using an end hoisting machine 26.
The top of the jib support frame 20 (2) is disposed on the second guide pulley 34, and the take-up reel 27 is placed around the guide pulley 34.
J4 configuration 1, where the fleet angle to
By installing a winding reel 27, etc., it was difficult to handle with a conventional drum winding machine, and it was difficult to handle.
The goal was to realize a clay ship capable of carrying out landing operations of (300 rn).

Next, in Figure 4, Kozuno is a horizontal jib type construction model],
It is an OA, and even in this type of construction crane, by having the same configuration as the jib hoisting type,
It can be used as an ultra-high-lift construction crane. That is, the endless winding machine 26 is installed at a suitable position on the counter jib 41, and the take-up reel 27 is installed near the winding machine 26, and the winding reel 27 is installed in the vicinity of the winding machine 26, and the winding and winding are carried out from the no-load side of the winding machine 26. The hoisting rope 28 to be taken is attached to the jib support frame 4.
A guide pulley 44 attached to the end of a horizontal beam 43 for lifting the tower protruding from the top of the tower toward the counter jib 41 side.
By winding it around until it reaches the take-up reel 27, the winding between the winding machine 26 and the take-up reel 27 is completed.
The handling of the rope 28 allows winding it onto a reel without any difficulty. Note that the guide pulley 44 is connected to the hoisting cable 2.
It goes without saying that the load side and the non-load side of 8 should be provided at a position where they do not intersect.

The above describes a climbing-type tower crane (the figure shows a free-standing structure, but in the case of a super high-rise building, it will of course be a floor-climbing type in which the tower is supported by the building frame). Even in a frame-mounted crane (not shown) that is installed and used on the upper part, the hoisting machine 26 and take-up reel can be mounted on the crane body 14 as in the above embodiment. can.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a jib hoisting type construction crane based on the present invention, Fig. 2 is an enlarged side view of the main parts, and Fig. 3 is a roving B1 of the hoisting cable! ! FIG. 4 is a schematic diagram of a horizontal jib type construction crane based on the present invention. 10... Jib hoisting construction crane 10 people... Jib horizontal construction crane 11... Tower
12...Outer mast 13...Climbing device 1
4...Crane body 15...Swivel mechanism 1
6... Jib 17... Turning machine 18... Hoisting cable 20. 42... Jib support frame 25... Jib hoisting winch 26... Endless winding machine 27... Rope winding Reel 28...Hoisting cable 32
...Pulley 33 on the side of the jib tip...Pulley 34 on the top end of the jib support frame, . 44・
・Guide pulley 35...Hook block 41...Counter jib 43...Horizontal beam

Claims (1)

[Scope of Claims] 1. In a high-lift construction crane, above the jib support frame erected above the revolving part, from the no-load side of the endless hoist installed at a suitable position on the revolving structure of the crane main body. A high-lift construction crane characterized in that a guide pulley for a hoisting cable to be wound up and let out is attached, and the guiding pulley is wound around the hoisting reel so that the hoisting cable is wound around a take-up reel within a fleet angle limit range. . 2. The high-lift construction crane according to claim 1, wherein the endless hoisting machine mounted on the crane body is equipped with a device capable of driving two hoisting cables, an S-strand cable and a Z-strand cable, at the same time. .