SU1255555A1 - Telescopic jib of load-lifting device - Google Patents

Description

The invention relates to cranes, in particular to telescopic booms of self-propelled cranes.

The purpose of the invention is to increase reliability in operation.

Figure 1 shows the telescopic boom in the extended position; Fig. 2 shows the same at the end of the extension of the first movable boom section; Fig. 3 shows the same at the end of the extension of the second movable boom section: Fig. 4 shows the same at the end of the extension of the third movable boom section; figure 5 is a section aa in figure 1,

The telescopic boom of the load-carrying device consists of the base 1, the sliding sections 2-4.

At the base of the section, bilateral spring-loaded rods and L-shaped two-arm rotary levers 11-13 are movably installed in the base of sections 5-7, with one end connected with double-sided spring-loaded rods 8-10. At the other end of the levers 12 and 13, blocks 14 and 15 are installed. At the base of the movable sections 4 and 3, brackets 16 and 17 are mounted) blocks 18 and 19. Blocks 14, 15, 18 and 19 are covered by a flexible link 20, one end of which is fixed on the lever 11 and the second is wound on a drum 2I driven 22, which allows adjusting: tension in the rope at dough levels - weak and strong Two-sided. spring-loaded rods 8-10 are suited to the bottom sheet of sections 4, 3, and 2 by springs 23 so that when sections 2-4 extend, bilateral, sealed rods 8-10, overcoming the weak tension of the flexible link 20, are included in OfSflO

from holes 24-26 on the bottom sheets of sections 2-4. The upper cogs of the DE1 spring-loaded rods 9 and 10 have projections 28 and 29 interacting with the openings 30 and 31, respectively, on the housings 5 and 6.

The device works as follows.

When extending section 4, sections 2 and 3 extend together, as through protrusions 28 and 29, the entrance n (not in holes 30 and 31, sections 2-4 are interconnected. In this case, the connection 20 is flexible, overcoming the weak tension created by the actuator 22, reel off from the drum 21.

When section 4 is moved, the bilateral spring-loaded rod 10, sliding along the lower sheet of section I, falls into one of the holes 26 under the action of springs 23 and enters it, overcoming the weak tension of the flexible coupling 20, turning the L-shaped lever 13 fixing sections 1 and 2. At this time, the protrusion 29 leaves the opening 31, freeing sections 3 and 4, which continue to move with further telescoping until the double-sided spring-loaded rod 9 enters hole 25, connecting sections 2 and 3. Similarly, extending the boom happens before full izheni sections 2 and 3.

The number of holes in the bottom sheets can be increased, thus providing intermediate telescoping lengths.

To retract the boom, the tension of the flexible coupling 20 is increased by the actuator 22 and, overcoming the force of the spring 23, rotates the L-shaped lever 11 and pushes the rod 8 out of the hole 24, after which the section 4 moves in. The remaining double-ended spring-loaded rods 9 and 10 cannot be derived, since the branches of the flexible link 20 on blocks 14 and 15 do not create the necessary coverage angle.

As section 4 moves in, block 1B approaches block 14 and at the end of the course the flexible link 20 covers block 14 by 180 so that as the tension of the flexible link 20 increases, the double-sided spring-loaded rod 9 comes out of the hole 25, allowing the section 3 to move, whereby the latter is associated with section 4, since the protrusion 28 extends into the opening 30,

Similarly, what happens is that the boom sections are fully moved.

The application of the proposed design allows to increase the carrying capacity of the boom and the reliability of the lifting device.

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Editor M.Blanar

Compiled by B. Dubinin Tehred L. Serdyukova

Order 4776/25 Circulation 799. Subscription BNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow Zh-35, Raushsk nab. D. 4/5

Production and printing company, Uzhgorod, Projecto st., 4

Proofreader M. Pojo

Claims (1)

TELESCOPIC ARROW OF THE LOADING DEVICE, containing hollow sections, in each of which a hole is made in the head part and inside which there is a power cylinder and a mechanism for fixing the position of the sections, characterized in that, in order to increase reliability in operation, it is equipped the control drive of the locking mechanism, including a winch with a drum, and the locking mechanism of the sections is made in the form of bilateral spring-loaded rods placed in the guide bodies, and rotary two-arm L-shaped levers, the lower shoulders are of which are kinematically connected with the said rods, and the upper ones are equipped with blocks, covered by ^ and a flexible connection, one end of which is fixed to the L-shaped lever of the clamp of the head section, and the other to the drum of the drive of the locking mechanism, while the clamp bodies are installed in the root part of each the movable section of the boom with the possibility of entry of the ends of the spring-loaded rods into the holes of the head and root parts of the female and male sections, respectively, when they are extended and retracted. SU „1255555 A1 FIG. /