RU2593179C2 - Method of operating self-propelled crane jib and device therefor - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention relates to jib cranes. Jib system comprises a jib and a counter-jib, telescopic strut of A-frame mounted on a rotary platform. Jib and counter-jib equal and symmetrically arranged with respect to axis of rotation of platform. Counter-jib can be equipped with a counterweight. Lifting, lowering and changing reach is synchronised with help of winches and rope.

EFFECT: higher carrying capacity of crane.

2 cl, 7 dwg

Description

The invention relates to structural elements of jib cranes, and in particular to devices and a method of working for raising and lowering crane arrows.

The invention can be used in ports, in transport, construction, during the installation of heavy equipment and structures.

Cranes are known, the boom of which includes a mast with braces, as can be seen in the example of “Guy-Derrick” - “Byte crane” or counter-arrow on the example of “Sky-Horse” - “Heavenly horse” (see appendix magazine page 16) .

However, the first and second valves have the following disadvantages:

a) the great complexity of the preparatory work;

b) lack of mobility;

c) an increase in carrying capacity is achieved by repeatedly increasing the weight of the crane.

There is also a method of increasing the carrying capacity of a crane by moving the boom support from the turntable to the annular segment (Germany 3215863, 3108455), which is also accompanied by the above disadvantages.

There is a way to increase capacity by using a U-shaped frame instead of a counter-arm (Japan, truck crane 5221261).

The second method has the following disadvantages:

a) does not reduce the load on the boom with long boom lengths;

b) the boom system is not balanced;

c) the crane works when the counterweight is lowered, so that it is impossible to perform the rotation movement.

The technical task is to create a way to increase the capacity of the crane.

The solution to the technical problem is carried out when changing in the device of the boom system.

It is proposed to install symmetrically about the axis of rotation 1 of the turntable 2:

a) arrow 3 and counter-arrow 4;

b) telescopic racks 5, 6 of the A-shaped frame 7;

c) the counterweight 8 on the hook 9, consisting of sections (modules) of equal weights to balance the load 10 on the cargo hook 11 of the boom 3.

This will allow:

a) reduce the load on the boom 3 and counter-arrow 4 by 3-4 times;

b) provide a constant lifting capacity of the crane when changing the boom 3;

c) provide mobility of the crane by achieving the overall height of the A-shaped frame 7.

The essence of the invention is that the counter-arrow 4 is equal in all respects, including weight, and is symmetrical to the arrow 3 relative to the axis of rotation 1 of the turntable 2.

The weight of the counterweight section 8 is equal to the minimum lifting capacity of the crane. If the weight of cargo 10 exceeds the weight of the counterweight modules 8 by n%, then the take-off of counter-strike 4 should be increased by n%, in order to maintain the balance of the boom system and thus ensure constant regulatory stability of the crane.

NOTATION Pos. Name one Turntable rotation axis 2 Swivel platform 3 Arrow four Counter-arrow 5 Telescopic stand 6 Telescopic stand 7 A-frame 8 Counterweight 9 Counterweight hook 10 Cargo eleven Cargo hook 12 Main Hoist Cargo Winch 13 Rope fourteen Auxiliary hoist cargo winch fifteen Rope 16 Sling 17 Counterweight hook eighteen Main Hoist Winch 19 Rope twenty Auxiliary hoist winch 21 Rope 22 Boom Departure Winch 23 Rope 24 Counter-strike departure change winch 25 Rope 26 Hydraulic cylinder 27 Hydraulic cylinder 28 Extendable sections 29th Extendable sections thirty Telescopic stand plate 6 31 Telescopic stand plate 6 32 Telescopic stand plate 6 33 Telescopic stand plate 5 34 Telescopic stand plate 5 35 Axis 36 Cable block 37 Cable block 38 Cable block 39 Cable block 40 Sling

In FIG. 1, 6 shows a structural diagram of a rotary platform 2 jib crane.

The device of the boom system includes an arrow 3, an A-shaped frame 7, a counter-arrow 4 with a counterweight 8.

Raising and lowering the load 10 on the cargo hook 11 is carried out by the cargo winch 12 of the main lift using the rope 13 and the cargo winch 14 auxiliary lifting by the rope 15.

The lifting-lowering of the counterweight 8, secured by a sling 16 on the hook 17 of the counterweight 8, is carried out by the main hoist winch 18 using the rope 19 and the auxiliary hoist winch 20 by the rope 21.

Changing the reach of the boom is carried out by a winch 22 using a rope 23.

Changing the departure of the counter-shot 4 is made by a winch 24 by means of a rope 25.

As telescopic racks 5, 6 of the A-shaped frame 7, telescopic booms of hoisting cranes consisting of hydraulic cylinders 26, 27 and extendable sections 28, 29 can be used.

To connect the telescopic racks 5, 6 to the A-shaped frame 7, dismantle the heads of the telescopic arrows and instead install the plates 30, 31, 32 (Fig. 2, 3, 4, 5) on the telescopic rack 6 and the plates 33, 34 on telescopic stand 5.

The connection of two telescopic racks is carried out by the axis 35, on which blocks 36, 37, 38, 39 can be mounted as an option.

In FIG. 1 shows the initial, intermediate and operating position of the A-frame 7.

Changing the departure of the boom 3 with the load 10 and changing the departure of the counter-strike 4 with the counterweight 8 (Fig. 6) is performed from the working position of the A-shaped frame 7 simultaneously and synchronously.

The method for changing the reach of boom 3 is based on the fact that the boom 3 and the counter-arrow 4 are equal, symmetrical about the axis of rotation 1 of the turntable 2 (Fig. 1, 6).

Telescopic racks 5, 6 of the A-shaped frame 7 are also installed symmetrically with respect to the axis of rotation 1 of the turntable 2.

To ensure the balance of the entire boom system, the weight of the load 10 and the counterweight 8 should be equal. In this case, it is necessary to simultaneously and simultaneously change the departure of the boom 3 and the counter-arm 4. In case of inequality in the weight of the load 10 and the counterweight 8, it is necessary to ensure the equality of the overturning and restoring moments by adjusting the departure of the hook 17 counter-strike 4 with a counterweight 8.

In FIG. 1 shows three positions of the A-frame 7:

a) the initial position at which the overall height of the crane allows the crane to move;

b) an intermediate position;

c) the working position is the maximum height at which the boom 3 with the load 10 and the counter-beam 4 with the counterweight 8 should be changed (Fig. 6), since the higher the height of the A-frame 7, the less the load on the boom 3 and counter-attack 4.

Boom of change of departure of arrow 22 and winch of change of departure of counter-shot 24 must be switched on simultaneously and operate at the same speeds to ensure equal and synchronous change of departure of boom 3 and counter-shot 4.

In turn, the raising and lowering of the load 10 and the counterweight 8 should be carried out simultaneously.

The counterweight 8 may be prefabricated, consisting of several sections (modules). Depending on the crane capacity, the weight of each module and the required number of them are determined.

Example: A crane with a lifting capacity of 1000 tf.

It is advisable to calculate the coefficient of stability of the crane in the presence of cargo 10 in the following conditions:

a) the absence of a counterweight 8 on the hook 17 of the counter-strike 4;

b) the weight of the load on the hook 11 of the boom 3 is equal to the weight of one module (section) of the counterweight 8;

c) set the boom 3 and counter-arrow 4 symmetrically about the axis of rotation 1 of the turntable 2;

d) the change of the boom 3 and counter-boom 4 is carried out simultaneously and synchronously.

Capacity Charts

1. In the absence of a counterweight on the counter-hook.

2. With a counterweight of 200 tf.

3. With a counterweight of 400 tf.

4. With a counterweight of 600 tf.

5. With a counterweight of 800 tf.

(see page 9)

Positive effect

1. A multiple reduction in the load on the boom and counter-shooting.

2. Dimension in height will allow to freely provide movement of the crane without dismantling the boom device.

3. The coefficient of specific metal consumption, determined by the ratio of the crane weight to load capacity, is less than or equal to 1.

4. The balance coefficient of the boom system, determined by the ratio of the weight of the cargo to the weight of the counterweight on the counter-hook, is 1: 1.25.

5. The capacity of the crane remains constant when changing the boom.

Claims (2)

1. The boom system for raising and lowering the crane arrows, including an arrow and a counter-arm, characterized in that it contains telescopic racks of an A-shaped frame mounted on a turntable, the counter-arm and boom are equal and symmetrically mounted relative to the axis of rotation of the turntable, while the counter-arm can be equipped with a counterweight. 2. The method of operation of the boom system for raising and lowering crane arrows, which consists in installing symmetrically telescopic A-shaped racks on a rotary platform, while the counter-arrow and arrow are symmetrically set relative to the axis of rotation of the crane, raising, lowering and changing the boom extension and counter-arrows are carried out synchronously using winches and a rope.

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