RU2476368C2 - Method of replacing climbing crane cable - Google Patents

Abstract

FIELD: transport.

SUBSTANCE: invention relates to repair of cranes, particularly, to replacement of climbing crane cables. Crane block suspension is lowered on prepared repair support to allow free revolution of block and tackle and to coil new cable reel or to lay it on working site. Winch drum fasteners holding one part of line are removed to drop said run downward. Lifting mechanism is used to wind worn-out cable on winch drum so that dropped part of line does not enter the block and tackle suspension. Cable ends are interconnected to proceed with coiling connected cables in feeding new cable in preset path. Lifted part of line of new cable is secured by safety halyard, connection of cables is broken to remove worn-out cable clamps from the drum to drop the cable on surface. Repair halyard is downed from cargo truck secured hereto to be connected with second end of new cable and lifted onto said truck. Both ends of new cable are secured to winch drum to remove safety and repair halyards and to coil new cable on the drum by lifting mechanism.

EFFECT: lower labour input.

1 dwg

Description

The invention relates to methods for performing repair work on replacing a steel rope of a hoisting crane and can be used in the operation of hoisting cranes of various types.

Rejection of ropes of hoisting machines in operation shall be carried out in accordance with the operating instructions of the hoisting machine, drawn up taking into account the requirements of ISO 4309.

If there is no corresponding section in the operating instructions, the ropes are rejected in accordance with Appendix 10 of the Rules for the Design and Safe Operation of Hoisting Cranes PB 10-382-00.

The following criteria are used to assess the safety of rope use:

- the nature and number of wire breaks;

- breaking strands;

- surface and internal wear;

- surface and internal corrosion;

- local reduction of the diameter of the rope, including rupture of the core;

- reducing the cross-sectional area of the wire rope;

- deformations in the form of waviness, basket-like, extruding wires and strands, creases, kinks, etc.

- Replacing a worn rope involves removing the fasteners on the winding winding drum, unwinding, dropping down, and then wiring a new rope through the pulley blocks, attaching it to the drum with various structural parts and winding (Russia patent No. 2211888, IPC B66B 7/00; Russia patent No. 2229430, IPC B66B 7/06; Russia patent No. 2351527, IPC B66B 7/06; as well as Shabashov A.P., Lysyakov A.G. General-purpose bridge cranes. - 5th ed., Revised and additional. - M .: Mechanical Engineering, 1980, p.133-134;

Bogorad A.A., Zaguzin A.T. Overhead cranes and their operation: a manual for technical schools. - M .: Higher school, 1984; p.77-82;

Chernega V.I., Mazurenko I.F. Quick Reference Guide for Hoisting Machines. - K .: Technics, 1988, p. 195, 290;

Nevzorov L.A. and other Device and operation of hoisting cranes: textbook. for the beginning. prof. education. / Nevzorov L.A., Gudkov N.I., Polosin M.D. - M.: IRPO, "Ed. Center "Academy", 2000, p.186-187).

- Recommendations of the “Technical Specifications for the Manufacture, Reconstruction, Repair and Acceptance of OGM-1-84 Hoisting Equipment” suggest replacing a worn-out rope after it has been discharged from the winch drum, by storing and manual wiring through moving, stationary and leveling blocks of the new steel steel envelope. the rope. This method is selected as a prototype.

This is a rather time-consuming process, during which errors during stocking of the chain hoist are not excluded, which is its drawback.

The objective of the invention is to eliminate the disadvantages of the prototype.

The problem is solved in that when performing work on replacing the rope of a hoisting crane, including moving and installing the crane and its load trolley in a safe one for disassembling the worn rope, stocking and wiring through movable, fixed and leveling blocks with the block suspension lowered down and covering one of the branches of the rope, lifting the winch onto the drum and securing the branches of a new rope on it, the block suspension is lowered onto a pre-installed technological stand so as to ensure alos rotate freely moving pulley block units, and a new cable from the coil is wound on the damper or laid out on the job site. Then on the drum remove the fastening clamps holding one branch of the rope, and dump it down. Then, the block suspension lifting mechanisms wind the worn rope onto the drum so that the discarded free end does not enter the block suspension, connect this end to the end of the new rope and continue to wind the already worn and new ropes together, passing the new rope through the movable and fixed leveling blocks tackle. The raised end of the new rope is insured, for example, with a safety rope, securing it to the construction of the freight trolley, and the worn and new ropes are separated at the place of their connection. The end of the worn-out rope is lowered by the block suspension lifting mechanism, bypassing all pulley blocks, the fastening clamps holding it are removed from the drum and thrown down from the cargo trolley. After that, the technological halyard prepared in advance and fixed on it by one end is lowered down from the freight trolley, the second end of which is connected to the second end of the new rope, lifted to the freight trolley, both ends of the new rope are fixed on the winch drum, the safety and technological halyards are removed and the mechanism lifting winding a new rope on the drum.

The invention is illustrated in the drawing, where figure 1 shows a schematic diagram of the replacement of a worn steel rope hoisting crane with a new one.

The overhead crane 1 includes a load trolley 2, on the drum 3 of the winch of the lifting mechanism 4 which is wound and fastened with clamps 5 to the rope 6, which requires replacement. This rope 6 passes through the movable blocks of the chain hoist 7 mounted on the block suspension 8, the fixed equalization block 9 and the bracket 10 for securing the load, which, in turn, when exposed to the block suspension 8 interacts with the limit switch 11 of the lifting mechanism 4 and turns it off .

Rope replacement work sequence 6.

The overhead crane 1 and its load trolley 2 are distilled and installed in the area of the site 12, safe for work. The block suspension 8 is lowered down and mounted on the technological stand 13 so that the moving blocks 7 of the pulley block have the possibility of free rotation. To prevent twisting of the new rope 14 during subsequent winding it onto the drum 3, it is pre-wound on a view 15 or laid out on the platform 12. On the drum 3 from the side of the branch 16 of the rope 6, not passing through blocks 7, 9 and bracket 10 (in figure 1 the initial position of this branch is shown by the dash-dot line), remove the clamps 5. The branch 16 is thrown down, the lifting mechanism 4 of the block suspension 8 winds the rope 6 onto the drum 3 so that its loose free end 17 does not enter the block suspension 8. Connect this end 17 rope 6 with the end 18 of the new rope 14 and continue winding the already connected old worn 6 and the new 14 ropes onto the drum 3, passing the new rope through the movable blocks 7, the fixed leveling block 9 of the pulley block and the bracket 10 for securing the load of the end switch 11 so that 2 is wound on the drum 3 -3 turns of a new rope. The connection of the ropes 6 and 14 is carried out in various ways: by bundling with a soft wire (with a rope diameter of up to 14 mm), by bundling individual highlighted strands with clamps (with a rope diameter of up to 20 mm), and even welding, followed by removal of the heat-exposed section, for example, using a grinder (with a rope diameter of more than 20 mm). Then, the raised branch of the new rope 14 is fixed with a safety rope 19 on the structures of the cargo trolley 2, the worn 6 and new 14 ropes are disconnected at the place of their connection. The end 18 of the new rope 14 is removed from the drum 3, and the end 17 of the worn rope 6 by the lifting mechanism 4, which also provides lowering of the rope, bypassing blocks 7, 9 and the bracket 10, is lowered down. The clamps 5 holding the rope are removed from the drum 3 and the worn rope 6 is dropped down from the load trolley 2. After that, the technological halyard 20, previously prepared and fixed on it by one end, is lowered down from the freight trolley 20. The second end 21 of the halyard 20 is connected to the end 22 of the rope 14 that came down from the view 15 and manually (or by means of a winch) lift it onto the freight trolley 2. Both ends 18 and 22 of the new rope 14 are fastened with clamps 5 to the drum 3. Remove the safety 19 and process 20 halyards from the structures of the cargo trolley 2 and the lifting mechanism 4, winding a new rope 14 onto the drum 3. Work on dismantling the worn rope 6 and installing new about rope 14 is over. After that, the removed rope 6, the technological stand 13 and the view 15 are removed from the site 12 and the strength of the rope stocking 14 is checked with a working load.

The proposed method of replacing the ropes of a hoisting crane eliminates errors during the repair work on the crane and reduces the complexity of the work itself.

Currently, the proposal has been tested at the enterprise with positive results when performing work on replacing worn-out ropes of bridge cranes with a lifting capacity of 10 to 50 tf installed at a height of up to 30 m and is recommended for implementation.

Claims (1)

A method of replacing a hoisting rope of a crane, including moving the crane and installing its cargo trolley in a safe place for dismantling a worn rope, stocking and guiding it through movable and fixed pulley blocks and through the base of the bridge, lifting the winch onto the drum and securing new branches on it rope, characterized in that the block suspension is lowered onto a pre-installed technological stand so as to ensure free rotation of the moving blocks of the chain hoist, and a new rope from the bay they are wound onto a view or laid out on the working platform, after which the fastening clamps holding one of the branches of the rope are removed from the winch drum and dropped down, then the worn rope is wound onto the winch drum so that the loose free end does not enter the block end suspension, connect this end with the end of a new rope and continue winding the already connected ropes, passing the new rope through the movable and fixed blocks of the chain hoist, after which the raised end of the new rope is insured, for example, with a safety hitch, securing it to the construction of the freight trolley, the worn-out and new ropes are disconnected at the place of their connection, the raised end of the worn-out rope is lowered by the lifting mechanism, bypassing the pulley blocks, they are removed from the winch drum holding the clamps of the fastening of the second end of the worn-out rope, and discarded from of the freight trolley, then from the freight trolley the technological halyard, previously prepared and fixed on it by one end, is lowered down, the second end of which is connected to the second end of the new rope, lifting t it on the trolley, and then both ends of the new rope is fixed on the winch drum, remove the safety tethers and technological designs with trolley and lifting mechanism produced a new coiling rope on the drum.