CN2467487Y

CN2467487Y - Draw-bar pulley balancing apparatus for tower crane

Info

Publication number: CN2467487Y
Application number: CN 01236167
Authority: CN
Inventors: 吴文发
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-03-26
Filing date: 2001-03-26
Publication date: 2001-12-26
Anticipated expiration: 2011-03-26

Abstract

The utility model relates to a draw-bar pulley balancing apparatus for a tower crane, which is a connecting apparatus of draw force between balancing draw bars, and a pin shaft is connected with the top of the tower crane. The utility model is characterized in that the middle part of the pin shaft is provided with a pulley wheel on which a balancing drag rope is wound. Both ends of the balancing drag rope are respectively connected with the draw bars of the tower crane by the pin shaft and a small draw plate. The utility model has the advantages of simple structure, reasonable structure, material saving and low cost. The draw bars are balanced, the stress condition of a draw bar system is improved, the maximum draw force of the draw bar of the tower crane is reduced, and the stress calculation method of the draw bars is simplified.

Description

Tower crane pull bar pulley balancing device

The utility model relates to the connecting device of pulling force between a kind of balance tower crane pull bar.Specifically, use this device after, can make the pulling force uniform distribution all the time of being born between the tower crane pull bar, therefore reduced the maxim of pulling force.

In order to satisfy the needs of building operation, tower crane has all increased the length of elevator boom rack.The suspention elevator boom rack generally all adopts two pull bars or three pull bars.So just make the elevator boom rack system form the statically indeterminate beam of three fulcrums or four fulcrums.In the carriage amplitude varying process, the tension variations of pull bar is very big, and the branch polarity of load is inhomogeneous between pull bar.

The purpose of this utility model is to overcome the shortcoming in the above-mentioned technology, proposes a kind of balancing device that can make tension uniform distribution between the tower crane pull bar, is installed in the junction of hoisting crane pull bar upper end and cat head.Therefore this device has been simplified the structure of hoisting crane tie system, makes it to become statically determinate system, can guarantee the Drawbar Pull uniform distribution of hoisting crane, and the maximum pull of pull bar reduces significantly when making crane amplitude variation.

The utility model is realized by following technical scheme: pulley is connected head tower by bearing pin, is wound with balanced drag-line on the pulley, and balanced drag-line two ends link to each other with little arm-tie upper end with bearing pin respectively, and little arm-tie lower end is connected with the tower crane pull bar with bearing pin.When tower crane has three pull bars, be connected with lower pulling plate at an end of balanced drag-line by bearing pin, the lower pulling plate lower end is with the fixing lower sheave of bearing pin.Be wound with balanced drag-line down on lower sheave, the two ends of following balanced drag-line and the other end of balanced drag-line are connected with the pull bar of tower crane with little arm-tie with bearing pin respectively.

The utility model has the advantages that: simple and reasonable, the balancing pull rod pulling force improves the stress condition of tie system, has reduced the maximum pull of tower crane pull bar.Saving in material reduces cost, has simplified the stressed method of calculating of pull bar simultaneously.

Two embodiment of accompanying drawings

Fig. 1 is contained in the structural representation of the tower crane pull bar pulley balancing device of cat head for pulley.Pulley 2 is connected cat head by bearing pin 1.Balanced drag-line 3 is walked around pulley 2, and its two ends link to each other with hoisting crane pull bar 5 with little arm-tie 4 by bearing pin.Reeve was used when the pulley spoke hole can supply lifting.

Fig. 2 is the tower crane pull bar pulley balancing device scheme drawing of three pull bars, and arm-tie 7 usefulness bearing pins 1 are connected cat head, and arm-tie 7 lower ends connect pulley 2 with bearing pin.Balanced drag-line 3 is walked around pulley 2, and the one end links to each other with lower sheave 9 with lower pulling plate 8 with bearing pin.Balanced drag-line 10 is walked around lower sheave 9 down.The two ends of balanced drag-line 10 and the other end of balanced drag-line 3 are connected with hoisting crane pull bar 5 with little arm-tie 4 with bearing pin down.

Claims

1, a kind of tower crane pull bar pulley balancing device, be connected the napex of tower crane by bearing pin, it is characterized in that in the middle part of the bearing pin pulley being housed, be wound with balanced drag-line on the pulley, balanced drag-line two ends are connected with the pull bar of tower crane with little arm-tie by bearing pin respectively.

2, according to the described tower crane pull bar of claim 1 pulley balancing device, it is characterized in that being connected with lower pulling plate by bearing pin at an end of balanced drag-line, the lower end of lower pulling plate is with the fixing lower sheave of bearing pin, be wound with balanced drag-line down on lower sheave, the two ends of following balanced drag-line and the other end of balanced drag-line are connected with the pull bar of tower crane with little arm-tie with bearing pin respectively.

3, according to the described tower crane pull bar of claim 1 pulley balancing device, it is characterized in that pulley links to each other with the arm-tie lower end with bearing pin, the arm-tie upper end is connected with bearing pin with cat head, is wound with balanced drag-line on the pulley, and balanced drag-line two ends are connected with the tower crane pull bar with little arm-tie by bearing pin.