SU893825A2 - Bridge-type crane - Google Patents

Description

(54) BRIDGE TYPE CRANE

one

FIELD OF THE INVENTION The invention relates to a lifting and transport machinery, namely, bridge-type cranes for transporting pipes.

According to the main author. St. No. 652091 is known for a crane containing a load-carrying trolley that is moved along a span structure with a load-carrying crossbeam that carries drive carriages with gripping legs and is suspended from the trolley by means of polyspast systems containing moving and fixed blocks, with one of the moving blocks of the polyspast system mounted on each carriage , and on the traverse there are free blocks and a rope winch, the channel of which with its free end is fixed on each carriage 1.

However, in the crane, when converting the gripping paws, excessive loosening of the winch ropes is possible, and with further rotation of the drum, the possibility of winding them onto the winch drum in the opposite direction is not excluded, which leads to a decrease in the reliability of the crane. In addition, since the moment of contact of the gripper with the pipe when it is lowered is not fixed by the crane operator, damage may occur.

Pipes. And the presence on the gripping paws of the inclined part in contact with the treated edge of the pipe, also leads to damage.

The purpose of the invention is to increase the reliability and efficiency of the crane.

The goal is achieved by the fact that the crane is equipped with double-arm levers, which are rotatably mounted on the traverse, on one shoulder of each of which is mounted a unit that interacts with the winch rope, and on the other - a cam that contacts the end switch, while in the lower part of the beam, additional levers in contact with the pipe when lowering the traverse and acting on additional limit switches located in

The top 5 of the crosspiece, and the gripping paws are provided with pads fixed at the point of contact of the paw with the edge of the pipe.

FIG. 1 shows a crane, general view; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows the node I in FIG. one.

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The crane contains 1 trolley 2 with a lifting mechanism that moves along the span;

traverse 3, which are rigid kinematic coupled polyspast systems, cargo drums 4 and 5 of which and fixed blocks 6 and 7 are mounted on trolley 2, movable blocks 8 and 9 are on traverse 3, and blocks 10 and I are respectively on carriages 12 and 13, mounted on traverse 3. On the latter, the bypass blocks 14 and 15 are also strengthened. The ropes 16 and 17, coming off drums 4 and 5, skirting blocks 6–11, 14 and 15, respectively, form two triple double polyspast.

A rope winch 18 is placed on the traverse 3, the ropes 19 and 20 of which are skirted by blocks 21-24, and are attached with their free ends to the carriages 12 and 13. Guides 25 and 26 are made to move the latter on the traverse (Fig. 2). The carriages move along them on the driving wheels 27 and 28.

For gripping the pipes, gripping paws 29 and 30 are provided, fixed on carriages and equipped with steel hardened plates 31 and 32. The plates are attached to the legs at the point of contact of their pipe edges, while the contact surface is made vertical.

In order to eliminate the slacks of the ropes 19 and 20 on the traverse 3, two shoulders levers 33 and 34 are rotatably mounted on both sides of the winch, on one arm of which are blocks 35, on the other cams 36, interacting with limit switches 37, which are made two-contact, some The contacts are designed to disable the drive of the winch 18 while loosening both ropes. 19 and 20, and others for simultaneous activation of the crane lifting mechanism.

In the lower part of the crosshead 3, arms 38 and 39, which interact with ropes 40 and 41 with two-pin limit switches 42 and 43, are mounted pivotally. Some contacts of these switches serve to turn off the lifting mechanism when touched by one of the pipe levers, and the other contacts to block from accidentally extending the paws when the control button is pressed during pipe transportation. Only after laying the pipe on the base and touching it with levers 38 and 39, the paws can be diluted. In the absence of a pipe under the grip, the paws are diluted using a special release button.

Crane works as follows.

Movement of the bridge 1 and the carriage 2 induces the traverse 3 on the pipe, lowering it until it touches the pipe with the levers 38 and 39,

after which the limit switches 42 and 43 disable the lifting mechanism. Then G5 turns on winch 18 for winding ropes 19 and 20. At the same time, under the effect of tension of cargo ropes 16 and 17, carriages 12 and 3 approach each other to stop against ropes 19 and 20, they are weakened, blocks 35 are lowered and limit switches 37 are activated ( rope loosening ceases) and includes a lifting mechanism. The grip, slippery overlays on the ends of the pipe, rises, picks up the pipe with its paws. In doing so, the levers 38 and 39 return to their original position (do not touch the pipe). After transporting the pipe and laying it in place, the traverse descends, the plates 31 and 32 slide along the ends of the pipe until the end switches 42 and 43 are pulled from the levers 38 and 39. Then, the mechanism of the winch 18 is opened to open the legs. In this case, the ropes 19 and 20 are wound on the winch, the gripping carriages are moved back to their original position, the cycle is completed.

Thus, the proposed design of the crane is more reliable and efficient, since its operation eliminates excessive loosening of the winch ropes, and the presence of additional levers in the lower part of the crosshead and the hardened steel plates on the gripping legs precludes damage to the pipes being transported.

The economic effect from the introduction of one such crane will be 160 thousand rubles.

Claims (1)

Invention Formula Bridge type crane St. No. 652091, characterized in that, in order to increase its reliability and efficiency, it is equipped with two-arm levers, which are rotatably mounted on the traverse, on one arm of each of which is mounted a unit that interacts with the winch cable and on the other hand a cam in contact with the limit switch , at the same time, in the lower part of the crosshead, additional levers are rotatably mounted, which come into contact with the pipe when lowering the crosshead and act on additional limit switches, located in the upper part of the crosshead, and the grip nye paw pads are provided, at the contact ukreplenny.mi feet from the pipe edge. Sources of information taken into account in the examination 1. USSR author's certificate Jsfo 652091, cl. 66 C 17/00, 1977 (prototype). jz / go / 4 3 Id Z9 42