SU385889A1 - DEVICE FOR EQUALIZING BOOM CRANES - Google Patents

Description

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The invention relates to lifting machines, in particular to boom cranes having a cable drive to change the boom reach, and can be used to change the counterweight departure both when the weight of the lifted load changes and when the boom departure changes.

Devices for balancing boom cranes are known, comprising a counterweight mounted on a lever pivotally connected to the crane platform and connected to the cargo cable and the crane boom.

However, the use of this device is ineffective due to the fact that a change in boom reach and a change in tension of the rope rope act on the counterweight independently of each other. Thus, when the boom is changed without the load on the hook, the reach of the counterweight increases, although almost the moment of the crane's own weight is enough to balance the moment of the weight of the boom without the load at the maximum departure.

The purpose of the invention is to provide a minimum departure and the possibility of increasing the weight of the weight of the counterweight. This is achieved by attaching a rope hoist to the counterweight lever connected via a movable block yoke to a load line, with 1 carp of polypaste tied to the boom via a boom rope and a fixed stop mounted on the crane platform that interacts with the movable block yoke for any boom outreach without lruz and its minimum departure with a load on the hook. The chain hoist rope can be stored on a drum rigidly and coaxially connected to the drum of the boom winch, and it is advisable that the loliapasta rope and the boom anante should grounded in opposite directions of winding on the corresponding coaxial drums.

FIG. 1 shows the device, a general view; in fig. 2 - the scheme of ropes storing.

The counterweight / mounted on the end of the lever 2, the other end of which is pivotally connected with the rack 3 mounted on the platform 4 of the crane. The rope 5 of the rope loliopaste is stockpiled on the drum 6, and its running end successively bends around the swivel block 7 fixed on the rack 3, block 5 of the movable block holder 9, stocked on the blocks Yu of the rope polispast fixed on the rack 3, drum 11 placed on the lever 2, and fixed on it. The drum // is rigidly, coaxially connected to the drum 12, onto which a rope 13 is wound, designed to raise the boom 14.

At the same time, the ropes 5 -k 13 are roped on the drums so that when the rope 5 is wound up, the rope 13 winds up and vice versa.

Such anchoring of the ropes allows reducing the moment applied to the output shaft of the boom hoist gearbox and, consequently, reducing the power of this mechanism. The movable block of the yoke 9, which is the connecting link between the rope 5 of the anti-weight chain-driven pulley and the cargo rope 15 and held by these ropes in the required positions, contains blocks 8 and 16 located in one plane. The rope 15 winding from the drum / 7 of the cargo winch , it goes around block 16 of the movable casing and, through the deviating block 18, goes through the declining block 18 and goes to the boom tip. The movable block of the yoke 9 can move under the action of a force arising due to the difference in the tension of the ropes 5 and 15 in the direction of this force. The stop 19 is located on the turntable of the crane and serves to limit the displacement of the movable cage 9 towards the boom and to absorb the loads acting on the movable cage. On the rotary platform 4 is mounted buffer device 20, which dampens the impacts of the lever 2 on the platform when the lever is lowered to the lower position. The automatically moving counterweight operates as follows. With a minimum boom reach and any load on the hook (within the allowable range), as well as when there is no load on the hook, the movable block holder 9 is pressed against the stop 19 (position I) due to the tension of the rope 15 under the action of the weight of the load or hook suspension. In this case, the counterweight lever 2 is in the lower position. When increasing the reach of the boom with an unloaded hook rope 5, hemming the drum 6 tends to turn the lever 2 around the hinge on the rack 3. At the same time, there is an effort in the rope 5 that is greater than the force in the rope 15 from the weight of the hook suspension. Therefore, the movable casing 9 moves from the stop 19, while the lever 2 with the counterweight / remains in the lower position. At the maximum outreach of the boom, the movable holder 9 occupies the extreme position of P. In the cases described, the load stability of the crane is both secured by a sufficient restoring moment created by the own weight of the crane and the weight of the counterweight 1 which is always in the lower position (at the minimum possible distance from the edge tipping crane). When increasing the reach of the boom with the maximum load on the hook, due to the necessary selection of device parameters, the force in the rope 15 from the weight of the maximum load is always greater than the force in the rope 5 from the moment on the lever 2 created by the weight of the counterweight. Therefore, the movable sleeve 9 is constantly pressed against the stop 19, and the rope 5, winding on the drum, turns the lever 2, increasing the counterweight offset /. Accordingly, as the boom is reduced, the counterweight is reduced / reduced. When boom luffing with a load on a hook whose weight is different from the maximum increases, the luffing of the counterweight increases until the forces in the ropes 5 and 15 become equal, after which the rotation of the lever 2 stops and the movement of the movable casing 9 from the stop 19 begins. In this case, the greater the weight of the lifted load, the greater the increase in the departure of the counterweight. Accordingly, when the boom is reduced, the movable holder 9 is first moved to the stop 19, and then the offset of the counterweight 1 is reduced. Thus, the amount of offset of the counterweight automatically changes depending on the boom reach and the weight of the lifted load. When the crane is operating in cramped conditions, the lever 2 with the counterweight 1 is locked with a finger in the lower position. In this case, when changing the luffing of the boom, the immobility of the lever with (the counterweight is always compensated by moving the movable block holder 5. Object of the invention 1. A device for balancing the jib cranes containing the counterweight attached to the lever pivotally connected to the crane platform and connected to the cargo cable and a boom of a crane, characterized in that, in order to ensure a minimum overhang and the possibility of increasing the weight of the weight of the counterweight, a rope hoist is attached to the counterweight lever connected through 1 A block holder with a cargo rope, the rope of a chain hoist, is connected to the boom via a jib cable, and a rigid stop is installed on the crane platform, which interacts with the movable block holder for any boom outreach without a load and its minimum departure with a load on a hook. A device according to claim 1, characterized in that the rope of the chain hoist is stored on a drum rigidly and coaxially connected to the drum of the boom winch. 3. The device of paragraph 1 and 2, characterized in that the cable of the polyspast and boom cable have opposite winding directions and the corresponding coaxial drums.

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