DE2260524A1 - JIB CRANE - Google Patents

Description

AUSIiGBEKHiN

The invention relates to Heb emas ch inen, but in particular Jib cranes that have a horizontal load control when changing ensure the crane outreach.

There are jib cranes known that entrialte a support frame and a jib articulated to the frame mentioned. For pulling in and lowering the boom, a fiollen- ² ^ g-is provided, the fixed lobes of which are attached to the frame and the loose fiollers are connected to the boom tip by tie rods. The rope of the above-mentioned pulley is reeved in such a way that the oil sections connecting the fixed and loose rolls run parallel to the boom pendulum plane and the dividing section is attached to the cylindrical drum of the boom winch arranged on the crane frame.

In addition, a hoist winch is placed on the frame mentioned.

whose rope has reeved into the hoist pulley.

The drums of the boom pull-in winch and the hoisting winch are kinematically connected in such a way that when the boom is pulled in, the load is lowered, but when the boom is lowered, the load is lifted (see the USSR copyright certificate No. 88593, class 35b, 3 ₀₄ , 1950).

A major shortcoming of such designs is that in these the load management has significant deviations from the horizontal. This circumstance is due to the fixed The transmission ratio of the cantilever roller train is conditional, which means the constancy of the vertical component of the boom tip speed It is not certain which constancy to maintain a horizontal load path when pulling in the boom is required.

Jäs jib cranes of the same type are known, in which the drum of the Jäseinzlehninde is made of two interconnected parts, one of which has a variable diameter. In addition to the jib rope, which ensures that the jib is retracted, the second end of the hoist rope, which is used to lift the load, is reeved onto the winch mentioned (see, for example, USSR copyright certificate No. 107258, class 35b, 3fo, 1956).

Such a design of the drum provides the required ratio between the speed of the boom tip retraction and that of load lowering and as a result

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including the horizontal position of the load guidance in the event of a change the crane reach.

With these drums, however, the largest diameter

it is

knife about 4 to 6 times the smallest and "'only a single-layer oeil-winding on the drum is possible, which in the case of several jib cranes, dimensions that are inadmissible in terms of construction, especially with a large length of the rope to be wound up caused. The use of a drum with a variable diameter is excluded in practice even if for the Crane a set of interchangeable booms of different lengths is provided and when transitioning from one boom on the other hand, the drum mentioned must be replaced.

The invention aims to remedy the above-mentioned deficiencies.

The invention is based on the object of a construction of the jib crane to develop in which the pull-in roller train is perfected in such a way that it is a variable Has translation that changes when retracting or lowering the boom so that the vertical component of the boom tip speed of movement remains constant in practice when the crane radius changes.

The problem posed is achieved in that the boom crane with boom, which is articulated on a frame on which a winch is arranged, - the pulling in and üenken the boom by means of Jtolleiizug ensures "the one

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oatz represents fixed and loose roles, of which the fixed Rollers attached to the crane frame, the loose rollers are connected to the boom tip by tie rods, the ones mentioned Roles connecting pulleys run parallel to the boom pendulum plane, and there is also a winch that

own
Ensures the lifting and lowering of the load via a ^ roller train, the drums of the winches mentioned being kinematically connected to one another in such a way that the winches rotate in opposite directions at the same time, whereby a simultaneous retraction of the boom and lowering of the load takes place, according to the invention Outrigger pulley train is provided with additional rollers which are attached to symmetrically arranged trestles, which are connected to the crane frame by axial joints running parallel to the boom pendulum axis, and the cable of the outrigger pulley train is reeved in such a way that the additional rollers are connected to the loose rollers by an equal number of cable runs will.

Such a design ensures a high level of accuracy in the horizontal load management at any coordinate position Axles of the fixed rollers of the cantilever roller train on the crane frame and without assembling complicated and expensive drums with variable diameter on their length possible.

Even if there are a large number of interchangeable arms of different lengths and shapes, the Load can be guided horizontally.

This will greatly simplify the facility

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horizontal load management as well as an increase in performance by. Time savings for converting the crane when replacing one boom with another achieved.

It is useful that on the jib crane according to the invention the loose shoulders of the cantilever pulley are installed axially *

With such an embodiment of the cantilever pulley, the cable pitch angle on the pulleys is reduced and the rope service life is extended.

In the following, the invention is based on the description of an embodiment and the accompanying drawings explained in more detail. It shows

Fig. 1 Overall view of the executed according to the invention Jib cranes;

Fig. 2 view of the roller train designed according to the invention, which ensures the retraction and lowering of the boom and reeving of the ropes with the mentioned pulley (view in Direction of arrow A in Fig. 1);

3 shows another embodiment modification of the cantilever roller nzuges.

The jib crane according to the invention includes a support frame 1 (Fig. 1) to which a boom 2 is articulated and a Winch 5 for lifting and lowering the load and also a winch 4 for pulling in and lowering the boom 2 is arranged.

The winch 4 operates the boom 2 by means of a pulley, the one set of loose rollers 5 (Fig.l, 2) and fixed Roles 6, 7, 6, 9, 10 (Fig. 2). Here are the loose

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Hollen 5 with the tip 12 of the boom 2 by a pull rod 11 (Fig. 1, 2) connected, the fixed roller ö (Fig. 2) is articulated to the crane frame 1 and the fixed rollers 9, IO

one

are also attached to the frame 1 and each rotate in νzur Cantilever pendulum plane parallel J plane.

The additional hollows 6, 7 with the non-sliding axes 6a and 7a are attached to the brackets 13, 14, which are connected to the frame 1 by axial joints 15, 16, the axis 17 of which is the pendulum axis 18 of the boom 2 runs in parallel, are connected. The mentioned roles of the cantilever roller train are through with each other the rope 19 of the winch 4 connected, which runs over the roller 9 on the frame 1 on the loose roller 5 and wraps around it to fixed additional role 6 arrives. As the rope wraps around the mentioned pulley 6, it returns to the loose pulley 5 » wraps around this and runs onto the fixed roller 8. The rope 19 then returns to the loose roller 5, wraps around it this and runs on the fixed roller 7. As the rope 19 wraps around the fixed roller 7, it runs on the loose roller 5 and further onto the fixed roller 10. The rope 19 returns from the fixed roller 10 to the drum 4 a of the winch 4.

In our detailed example, the mentioned rope 19 reverses back to the drum 4a, but it can be attached directly to the crane frame 1.

The strands of the rope run through such a reeving 19, which connect the loose roller 5 to the fixed roller 8, in parallel the boom pendulum plane, which in particular causes the rope 19 to run off the loose roller 5 in the event that the

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loose roll 5 inside the through the axes of the rolls 6,7 »8 limited outline is ^ avoided.

The loose rollers 5 are with the additional fixed rollers 6 and 7 connected by an equal number of strands of the rope 19, said strands being symmetrical to the pendulum plane of the boom 2 are inclined, whereby in particular the arrangement of the axis of the loose rollers 5 in eggs during roller pull operation Cantilever pendulum level is guaranteed.

After the embodiment modification of the shown in Fig. 3 Roller train of the boom 2, the rollers 5 »5a are on different Axes which are symmetrical with respect to the pendulum plane of the boom 2, mounted and combined in a block 20.

In this case, the reeving of the rope 19 takes place in the following manner. The rope 19 runs from the drum 4a of the Winch 4 over the roller 9 on the frame 1 to the loose roller 5a, wraps around this and is directed towards the fixed roller 7. The rope 19 also wraps around the roller 7 and then the roller 5a and runs towards the fixed roller 8. After the rope 19 the Roll 8 wraps around it, it runs on the loose roll 5 and on to the fixed roll 6. Then the rope 19 returns to the loose Roll 5 and from there on the roll IO on the frame 1 the drum 4a of the winch 4 back or it is directly on Frame 1 attached.

The reeving of the rope 19 between the rollers of the

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casual roller trains (Fig.2, 3) can also be used in any other

necessary

Be done in a manner, but only in compliance with the ^ condition, that the number of rope strands connecting the fixed pulleys 6 and 7 with the read pulleys 5 and 5a is equal to each other.

The rope 21 of the load winch 3 runs on the pulley 22, which is arranged at the tip 12 of the boom 2, and is further reeved into a load roller train 23.

The drums 3a and 4a on the winches 3 and 4, respectively, are kinematically connected to one another by gears 24 and 25. In addition, the aforementioned drums can be attached to winches 3 and 4 by a differential gear, planetary gear or by a another gear can be coupled with a fixed ratio. The aforementioned kinematic connection can be used to ensure during operation only the load winch 3 (Fig. 2, 3) can be released by a coupling or in another way.

Operation of the Inventive _u emäßen boom crane runs in the following manner.

The drum 3a (fig.2) of the kVinde 3 and the drum 4a of the Winches 4, which are kinematically linked to one another, begin

to rotate simultaneously in opposite directions, e.g. for erecting the boom.

At this moment, the rope 19 is wound on the

Drum 4a of the winch 4, then wraps around the rollers 5, 6, 7, 8, 9, IO and pulls the loose rollers 5 of the roller train of the boom 2 after.

As a result, the tip 12 of the

while however
Boom 2 retracted, ν the rope 21 begins to unwind from the drum 3a of the winch 3, with a lowering of the

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Load with respect to the tip 12 of the boom 12 takes place.

üäit the pulling of the loose rollers 5 of the pulley of the boom 2 on uie fixed rollers 6, 7, 0 there is a uniform change in the angle of inclination of the spaces of the rope 19 which connect the loose rollers 5 to the fixed rollers 6, 7, and in accordance therewith, the over ^se v ^ ilpAusT-egerrollenzug and the approach speed of the loose "should 5" changes to the fixed rollers * This in turn causes a corresponding change in the lifting speed of the tip 12 of the boom 2.

At any given moment, the lifting speed of the tip 12 of the boom 2 is equal to the load lowering speed igke it, which ensures a horizontal load guidance when the extension of the boom 2 changes will.

When the boom 2 is lowered, the rope 19 is unwound from the drum 4a of the winch 4, but the rope 20 is wound meanwhile on the drum 3a of the winch 5 and causes thus a load stroke. The load remains on one and the same when the extension of the boom 2 changes Horizontal.

With the pulling of the loose rollers 5 to the fixed ones

Rolling can be done with a minimal extension of the boom 2

by

the axis of the loose rollers 5 get inside the ^{contour defined by} the axes of the rollers ö, 7, Ö. The position

Transmission ratio corresponds to the minimum * ^ of the pulley,

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BATH

The operation of the jib crane according to the invention, the is carried out according to the modification shown in Fig. 3, runs in a similar way, the only difference is that that the oil 19 by removing the loose lumps 5 and the solid ones Rolls 6 and 7 wraps around with the pulling of the sliding block 20, compared to that in Pig. 2 shown Design modification at a smaller angle to the plane of arrangement the lug of the pulley is inclined, which significantly extends the lifespan of the ijeile.

The inventive design of a cantilever roller train with

Gear ratio
variable ν can be used with any jib cranes: self-propelled cranes, tower cranes, gantry cranes, ship cranes, floating cranes, etc., which are equipped with a straight, curved or double luffing jib.

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Claims (2)

1 · Jib crane with jib is articulated to a Bohemia, on which a winch is arranged ₈ which ensures the pulling in and lowering of the jib by means of a pulley, which is a set of fixed outer halls, of which the uad fixed pulleys attached to the crane frame, the loose pulleys are connected by tie rods to the jib head, the rope strands connecting the pulleys mentioned run parallel to the pendulum plane of the jib, and there is also a winch ₉ own the lifting and lowering of the * Load ensured, the drums of the winches mentioned are kinematically connected to each other so that a simultaneous Both winches rotate in opposite directions, which means that the boom is retracted at the same time and lowering of the load takes place, thereby marked Ichnet that the pulley of the boom (2) is provided with additional rollers (6, 7) that are symmetrical arranged blocks (13,14) are attached, which with the crane frame (1) by parallel to the pendulum axis (18) of the boom (2) running axial joints (15,16) are connected, and the pulley rope (19) of the boom (2) is reeved in such a way that that the additional rollers (6, 7) are connected to the loose rollers (5,5a) by an equal number of cable runs. 2. The crane of claim 1, characterized marked ZQ leans ^ that the loose pulleys (5, 5a) of the pulley block of the AurlegSVS are installed (2) axkal relative to each other. 309 8 ^ 6/03 28 ■ Blank page