SU1221197A1 - Load-hoisting unit telescopic boom - Google Patents

Description

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

The purpose of the invention is to simplify the design and reduce the metal consumption.

FIG. Figure 1 shows the telescopic strega in the folded state; in fig. 2 - the same, at the end in the law of the second mobile section. Arrows; in fig. 3 - the same, at the beginning of the slide of the second movable boom section; in fig. 4 is a schematic for extending all boom sections.

A telescopic {osectional boom) consists of a base 1 and sliding sections 2-4. At the base of sections 2 and 3, two-sided T-shaped clips 7 and 8 are hinged on the oi 5 and 6. The clips are pressed against the covering section by springs 9 and 10 when the boom sections are folded. The clips, with their internal ledge, enter the holes I and 12 at the base of the section.

In the head part of the base 1 and section 2 there are holes 13 and 14. A cylinder 15 is fixed inside the CTp ejai. The clips 7 and 8 are located between the sliders 1b and 17 at the base of the corresponding sections.

The cylinder 15 consists of a fixed sleeve 1B and retractable sleeves i 9 -21. The number of retractable sleeves is equal to the number of movable sections. The head of the last sleeve 21 is pivotally connected to the last slide section 4. At the head of each sleeve there are self-mounted sliders 22-24 that can move along the lengths of 25 on section 4. At the base of sections 2 and 3 there are protrusions 26 and 27 s a transverse profile similar to the profile of the guide 25. The inlet and outlet of the liquid to the cylinder 15 is carried out through the inlet 28.

A special winch (not shown) serves to draw in an arrow.

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The operation of the device is carried out. in the following way. When the flow of fluid into the cylinder 15 is the promotion package of sleeves 19-21. The sleeves are always pulled out with a pack, since there is no load on the sleeves 19-20. When this occurs, the promotion of the package sections 2-4. The movement of the movable sections takes place as a package, since the latches 7 and 8 with their internal grip, the entry into the holes I and 12 carry the sections 2 and 3 along with the section 4, which is pulled out directly by the sleeve 21, while the outer clamps of the latches 7 and 8 are spring 9 and 10 are pressed against the compartment and slide it until the latch 7 comes to the hole 12. After entering the outer grip 11 of the outer grip of the latch 7, the inner grip comes out of the hole 12, freeing the section 3, which further extends the cylinder 15 fascinates fic 25 8 until latch 8 reaches hole 14 and releases section 4. Thus, the boom extends to the end of the stroke. When the section is extended, the package is moved, while the external sections remain in their extreme positions, being fixed by the external grip of their latch, which prevents the section from moving forward. At the same time, the sliders 22-24 on the heads of the sleeves 19-21, successively moving along the guide 25, at the end of the extension of the corresponding sleeve, occupy a position against the projections 26 and 27 on sections 2 and 3. Thus, the free length of the sleeve between the supports in any the moment of advancement does not exceed the stroke of one cylinder liner 15.

The boom is moved by a winch

The use of the invention allows to simplify the design, increase the reliability of operation, reduce the metal capacity and the cost of manufacturing the structure.

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Claims (1)

TELESCOPIC ARROW OF THE LOADING DEVICE containing hollow sections, inside which the power cylinder is located, and a mechanism for fixing the position of the sections, which, in order to simplify the design and reduce metal consumption, the power cylinder is made according to the one-way scheme and consists of telescopic sleeves with the number of sections wherein the stationary cylinder liner is rigidly connected with the stationary section, and the extreme movable one is connected with the head of the sliding section, moreover, an opening is made in the head of each of the movable sections, and fixing sections mechanisms still represents a turning position the T-shaped lever with a ledge arranged with the possibility of entering his shelves in openings amplification of the male section respectively when the nomination motion. Reach- $ respectively- φα · .ΐ