SU118367A1 - Twin-support slewing railway crane for installation of bridge span structures - Google Patents

Description

Two-pivot railroad cranes are known for the installation of span bridge structures with cargo and counterweight brackets and a support part supported through beam supports on the sidewalls of railway platforms. However, these cranes are characterized by insufficient stability and are of considerable weight.

The peculiarity of the described crane is that the support to the cantilever parts are made in the form of a solid beam, rotated in a horizontal plane around its vertical axis of symmetry by mixing in the cross beam direction of the beam supports, using spindle screws, this improves the stability of the crane and reduces it weight.

With the purpose of automatic alignment of the transverse equilibrium of the crane when it is turned, the side pins are spring-loaded.

FIG. 1 shows a speck, side view; in fig. 2 is the same, top view; in fig. 3-extreme position of the beam on the support; in fig. 4 is a section along the axis of the support in FIG. 1 by LA.

The head of the crane beam consists of a basic structure /, two main cantilevers 2, rigidly fastened to each other and resting on two platform 3, by means of supporting frames bearing screw elevators 4.

A counterweight consisting of two parts was used to ensure the balance of the crane when lifting or lifting the load. One part 5 is fixedly mounted on the end of the counterweight console, and the second part 6 can not be moved on rollers along the entire main beam of the crane. The counterweight is moved using a winch 7 placed inside the box of the base building. The winch drum is divided into two parts. From one part the rope goes to the front end of the counterweight, and from the other to the back end.

Winch 7 of the counterweight and winch 5 lifting cargo interlocked with limit switches (in the drawing is not knocked out) in such a way that in the position of the crane with the console out to the side when running the counterweight drive or cargo polyspast drives overload to one of Elastic supports. The limit switch of this overloaded support temporarily turns off the drive causing this overload, until the second of the above mentioned drives, which continue to work, is removed until the overload is removed.

l; 118367-2 -

The rotation of the crane with the removal of the main pulley blocks to the side is accomplished by lateral shifting of the supporting frames 9 of the basic structure along spherical supporting parts 10, which are stationary on the supporting hexagonal platforms. The displacement of the disputed frames 9 is carried out with the help of screw drives of rotation 11, one located on each supporting platform.

Each screw drive of rotation // consists of two screws located on the sides of the crossbar of the support frame 9. Both screws of the drive 11 are rotated from one electric motor through a reducer placed inside the crossbar box of the support frame 9 (not shown). There is also placed a limit switch limiting the extreme position of the nuts 12 on the screw. The nuts of the 12 screws are hingedly mounted on the tides of the upper balancer of the central spherical support part 10. Drive to calculate the movement of the base structure along the support parts to the right and to the left of the platform axis.

In order to ensure the lateral stability of the crane when it is rotated and the center weight of the crane to the platforms during rotation, resilient spring-loaded auxiliary supports 13 are installed on the sides of the support 10. The elastic springs of these supports are provided by the cup springs. The draft of the elastic supports 13 is transferred to a limit switch next to them (not shown in the drawing).

When the cargo console is moved to the right, the counterweight moves the console to the left. This ensures the lateral equilibrium of the crane at any moment of rotation.

If one of the drives runs ahead and forms an overload on the resilient auxiliary support 13, then the limit switch attached to it stops the operation of that turn actuator that caused the overload on the lateral elastic support.

The second trailing turn actuator (on the other supporting platform) continues its work and straightens the transverse equilibrium of the edge.

When the crane is operating straight without turning the main beam, the lifting of the fixed part 5 of the counterweight and the load, as well as the movement of the sliding part of the counterweight, is carried out while observing the springs of the undercarriage to avoid significant overloads on one platform.

Subject invention

Claims (2)

1. A double-support slewing rail crane for installing bridge spans with a cargo and counterweight console and a support part supported through beam supports on sidewalls of railway platforms, characterized in that, in order to increase the stability of the crane and reduce its weight, the support and console parts are made in the form of a solid beam, rotated in a horizontal plane around its vertical axis of symmetry by displacement in the transverse direction of the beam supports, carried out with the help of spindle screws. 2. The form of making the supporting part of the crane according to claim 1, characterized in that, in order to automatically equip the transverse equilibrium of the edge when it is turned, the side bearings are spring-loaded. Committee on Inventions and Discoveries at the Council of Ministers of the USSR Editor N. S. KutafinGr. 154 Infor / matsiopyo-publishing department. Sub. to pec. 29.VI-59g Volume 0.51 p. L. Zak. 2259Tirai 1675Price 75 cop. Printing houses of the Committee on Inventions and Discoveries at the Council of Ministers of the USSR Moscow Petrovka, 14. IL /