SU1595785A1 - Tower crane - Google Patents

Abstract

The invention can be used in devices for balancing lifting machines. The purpose of the invention is to increase reliability by ensuring the stability of the crane when the cargo winch rope breaks. The crane contains an arrow 2 and a console 4 mounted on the tower 1, and the console has a cargo trolley 6 with a counterweight suspended from it 27. When the cargo rope breaks, the counterweight 27 suspended on the cargo trolley is dropped to the ground. As a result, the crane is prevented from tipping over. 1 hp f-ly, 2 ill.

Description

one

(21) 4475197 / 27-1I

(22) 06.23.88

(46) 09/30/90. BULL. Number 36

(71) Kharkiv Branch of the Research Design Technological and Design Institute

 Energomontazhproekt

(72) I.S.Narkozov, A.V.Oleinik and Yu.V.Chmyr

(53) 621.874 (088.8)

(56) USSR author's certificate

No. 610777, cl. B 66 C 23/72, 1976. (54.) BMIENNIP CRANE

(57) The invention can be used in devices for balancing lifting machines. The purpose of the invention is to increase reliability by ensuring the stability of the crane when the cargo winch rope breaks. The crane has booms 2 and a cantilever 4 mounted on the turret 1, and the console has a cargo trolley 6 with a counterweight suspended from it 27 / When a cargo rope breaks, the counterweight 27 suspended on the cargo trolley is dropped to the ground. As a result, the crane is prevented from tipping over. I 3. Ii. f-ly, 2 ill.

ten

(L

SP

SO JV

00 Cn;

The invention relates to lifting machines, in particular to tower cranes.

The purpose of the invention is to increase reliability by ensuring the stability of the crane when the cargo winch is rope.

Figure 1 shows a tower crane; figure 2 - the console of the crane with the cart. The tower crane contains boom 2 mounted on cobout 1 with a cargo trolley 3, a boom 4 with a winch 5 of the load lifting drive, pivotally attached to the console mounted on the carriage 6 by means of 7 and 8 traverse 9, through which the rope 10 of the cargo winch is stockpiled.

The tower crane is provided with an additional arm 11 connected to the trolley, which is located between the main rods 7 and 8, mounted on the console trolley 6 with additional blocks 12 and 13. Through these blocks, the rope 10 and blocks 14 and 15, the yoke is formed by the tackle. Additional ha 11 and located from it on the side of the tower, the main ha 8 ha are made telescopic with the possibility of limited mixing of their sliding parts by means of stops 16 and 17 fixed to these parts. The traverse on its lower part is made with a hook 18 open to the side of the crane tower, and the console is made with an additional stop 19 for engagement with the lower part 20 of the traverse.

Limit switches 21 and 22 connected to the winch drive 5 are included in the load control circuit of the load lifting machine. Some switches 21 and 22 are mounted on the console, and the limit switch 23 is mounted on the trolley 6 and connected to the crosspiece by means of flexible cable 24. The crosshead is made with a vertical groove 25, in which the extension part 26 of the additional j1 plug is installed. On the hook 18 is freely suspended counterweight 27. The crane operates as follows. When lifting a large weight 28, the trolley 3 with a cargo hoist is mounted on the boom 2 at the departure, slinging is performed and the winch 5 is turned on to rise. Upon reaching a certain effort in the rope 10, which corresponds to the permissible load, the tackles start lifting the traverse 9, removing it from the stop 19.

ten

15

20

25 957854

After the engagement of the stop 16 and the gi 11, the polyspast 29 closes and the entire load from the yoke 9 is transferred to the polyspast 30, which can move the yoke 9 only after reaching. Not a certain force in the rope 10. In this case, the yoke 9 through the tug 24 acts on the limit switch 23, which turns off the drive of the winch 5. After the drive is turned off, the crank-mounted motor moves the cart 6 to the extreme left position, In this case, the limit switch switch 23, which will allow further operation of the drive on the rise. The stops 17 and 8 tons are closed, the load will be lifted 28. Moving the trolley 6 with the counterweight 27 to the lift will require a crane balancing.

When unloading the crane, the load 28 is lowered and, after touching the ground, the force in the rope 10 begins to fall, after reaching a certain force in the cable 10, the polyspast 30 cannot hold the part of the counterweight 27 that falls on it, the yoke 9 is lowered by the amount of vertical clearance a Gu 24 on the limit switch 23, which, in turn, prohibits the operation of the drive winch 5. In this position, the yoke 9 holds the chain hoist 29.

thirty

Next, the crane operator moves the cart 6 to the extreme right position and the cart 6 acts on the limit switch 22, which unlocks the limit switch 23, thereby allowing further lowering of the load 28. When a practically zero force is reached in the rope 10, the polyspast 29 lowers and the yoke 9 rests on the stop 19 .

With a sudden break of the rope and the fall of the load 28 when the cart 6 is on the leftmost outreach, the force in the rope 10 becomes equal to zero, tackles 29 and 30 cannot hold the yoke 9 with the counterweight 27. Therefore, the yoke 9 is rotated around the hinge of the ty, the open mouth of the hook 18 on the yoke thus allows the counterweight 27 to fall to the ground. The crane in this case will maintain a stable equilibrium position.

Claims (1)

1. A tower crane containing an arrow mounted on a tower with a cargo trolley, a console with a winch to drive a load lifting, hingedly mounted on the console trolley by means of a t traverse through which the cargo winch rope is stored, the lower part of the traverse is, that, in order to improve reliability by ensuring the stability of the crane when the cargo winch rope breaks, it is supplied with an additional Crane according to claim 1, except that, with a load control circuit, the switches are connected The body is hinged to the trolley 5 D of the winch, one of which is to install a console by a rod located between the main rods mounted on the. the console carriage with additional blocks in which the cargo winch rope is stockpiled, through which the traverse blocks and the cargo carriage are formed by the tackle, the additional ha is located on the console side of the tower, which can be connected to the carriage, and another finite switch is mounted on the trolley and connected to the crossmember by means of flexible rod, the crossbar being made with a vertical groove in which the sliding part is installed with limited movement. full th gi. hectares are made telescopic with the possibility of limited movement of their sliding parts by means of stops fixed on these parts, the traverse on its lower part is made with a hook open to the side of the crane tower, and the console is made with an additional emphasis for interaction with the lower part of the traverse, 2 o The crane according to claim 1, characterized in that, with the control circuit of the load lifting drive, the limit switches connected with the winch drive, some of which are set to The other end switch is mounted on the trolley and connected to the traverse by means of a flexible rod, the traverse being made with a vertical groove, in which the extendable part of the additional traction is installed with limited movement. FIG. 2