RU1782921C - Floating crane upper structure - Google Patents

Abstract

SUMMARY OF THE INVENTION: The upper structure of a floating crane in order to reduce construction and operating costs is made in the form of a pylon consisting of the lower and upper parts, on which the boom is pivotally mounted. The upper part is kinematically associated with a pulley of variation of a boom extension. A support console is installed on the bottom of the pylon, and the hinge is detachable. 1 s.p. f-ly, 2 ill.

Description

The invention relates to the field of floating crane construction and with the greatest effect can be used on floating cranes, which under operating conditions often have to pass under bridges.

It is widely known that for passage under bridges the upper structure of a floating crane must be able to reduce its height. Moreover, if the distillation is provided only once, then, as a rule, the upper structure is dismantled (cut off), and upon arrival at the home port, it is assembled in the design position.

If frequent passage under bridges is necessary, the upper structure is made of articulated racks having a special drive in the form of a winch with a rope pulley block. All this complicates and increases the cost of construction in manufacturing and operation.

The closest proposal for the number of matching main features is a ship crane. There is a crane truss pivotally attached to the portal on the portal. There is a multi-cast mechanism for turning the crane farm to the stowed position and vice versa.

The main disadvantage of the known construction is that a special drive (winch with a chain hoist) and guides are required to put the uprights in the stowed position. This complicates the design and makes it more expensive to manufacture and operate.

 The aim of the invention is to reduce costs by simplifying the design.

The goal in the upper structure of a floating crane containing a cargo boom with a pulley mechanism for changing its departure and a portal with a rack is achieved in that the rack is made, for example, in the form of a truncated cone, pivotally attached to the upper part of the portal, installed with an inclination to the side opposite the boom so that the center of mass of the stand is located behind the hinge connecting it to the portal. The rack is equipped with a drive to rotate it in a vertical plane.

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bones. To lay the rack in the stowed position, a support console is mounted under the hinge on the upper part of the portal.

The goal is achieved in that the rack rotation drive is made in the form of a pulley mechanism for changing the boom extension. In prior art solutions, the posts are trussed, monolithic. In order to turn the rack into the stowed position, in certain cases a separate cable winch is used. In the proposal, the rack rotation drive is made in the form of a pulley mechanism for changing the departure of a cargo boom, i.e. it is given additional function.

In FIG. 1 shows a general view of the floating crane in the working position; in FIG. 2 - view floating crane in the stowed position.

On the pontoon 1, the upper structure of the hoisting crane is mounted, consisting of a portal 2, to which the boom 3 and the stand 4 are hinged at the top. blocks 8, 9, 10 and 11. Under the hinge 12, a support console 13 is installed. The post 4 with the upper part of the portal 2 is connected via the connector 14. On the pontoon there is a support 15 for laying the boom in the stowed position. CM is the center of mass.

To prepare the floating crane for the stowed position, first lower the boom 3 to the support 15. For this, the hoist 6 of the boom change mechanism will etch the rope 7. As soon as the boom is supported on the support 15, the connector 14 is disconnected and the etching of the rope 7 is continued. so that the common geometric center of mass (CM) of the strut 4 extends beyond the hinge 12, it rotates spontaneously under the action of gravity and gradually lowers onto the support console 13. The winch 6 is turned off and the remaining operations of marching Are carried out according to known regulations. After

After the crane has completed the transition, the winch 6 is turned on again, the rope 7 is selected and the rack 4 is lifted first, since its weight is much less than the mass of the boom 3. Once the rack 4 reaches the working position, it is fixed with connector I. Continue to select rope 7 arrow 3 with the help of the mechanism for changing the departure 5 rises and

also cited; to working position. So, due to the use of one pulley mechanism for changing the boom reach, without additional costs, it is possible to translate the upper structure into the march

position and back. At the same time, the process of transferring the floating crane to the stowed and working position is also accelerated.

Claims (2)

1. The upper structure of a floating crane containing a portal, a cargo boom, a pulley with a winch fixed in the lower part of the portal, and a stand attached with one side of its lower part to the upper base of the portal with a detachable connection, and the opposite with a horizontal hinge, characterized in that, in order to simplify the design, the rack is made in the form of a truncated cone and installed with an inclination towards the hinge connecting it to the portal, with the center of mass of the rack at a greater distance from the vertical axis of the portal than the aforementioned hinge, while the portal is made with a support console placed on it under the hinge to lay the rack on it when the crane is in transport position, and the load boom is pivotally connected to portal on the opposite side of the specified support console. 2. The building according to claim 1, characterized in that the boom pulley blocks are placed on the upper and lower bases truncated cone and on the root of the boom with their bending around in the indicated sequence with a boom rope. Fie. 1