RU182678U1 - POLISPAST N.I. HABRAT - Google Patents

Abstract

The polyspast is designed to reduce the effort in the drive branch in comparison with the perceived one and can be used both independently and as an integrated device in the drives of the lifting mechanisms of hoisting machines. The polyspast contains a movable axis with a set of moving blocks and a shaft in the bearing bearings of the bed, on which are fixed two drums with the same working diameters; in the space between them movably in the tangential direction - a set of fixed blocks; at the same time, the flexible body is enveloping sets of blocks and wound on drums, the ends are fixed on the same side with the drums. The technical result is an increase in the working zone of the displacement of the moving axis (hook suspension) of the chain block, simplifying the design, reducing metal consumption. 1 of FIG.

Description

The utility model relates to lifting equipment used to reduce the force in the drive element when lifting weights and can be used both independently and as an integral part of special mechanisms of lifting machines.

A technical solution is known that contains a movable axis with blocks and a drive shaft in the supports of the bed, on which a motionless drive element is mounted in the form of an asterisk with a drive chain, motionless two drums with different working diameters and in the gap between them, movably in the tangential direction, a set of blocks, enveloped by a flexible body, with fixed ends on opposite sides on the working surfaces of the drums. (Patent for utility model of the Russian Federation No. 154887 MGGK B66D 3/04. Analog)

The main disadvantage of this technical solution is the reduced durability of the flexible organ, since for any half-cycle — raising or lowering the movable axis with blocks, the flexible organ passes through all pulley blocks, reeling from one drum and winding onto another, it receives a full bending cycle on each block and half-cycles of bending on each of the drums, which leads to a decrease in the durability of the flexible organ.

When creating the technical solution described above, the task of increasing the working area of the displacement of the movable axis (hook suspension) of the tackle was not posed, but one issue was solved - increasing the multiplicity of the tackle.

According to the technical nature and purpose of the problem being solved, the closest are known technical solutions (Hoisting machines // M.P. Aleksandrov, L.N. Kolobov, N.A. Lobov, etc. M .: Mechanical Engineering. - P. 138, Fig. 5.4, V. M. Alexandrov, Lifting and transporting machines, Moscow: Vysshaya Shkola, 1972. P. 199, Fig. 115. Prototype), containing a fixed, movable axis with sets of blocks, enveloped by a flexible body with fixed ends on a winding drum (an element for winding and unwinding) mounted motionlessly on a shaft in the bearing bearings of the bed.

The main disadvantage of this technical solution is the presence of two shafts (axles) with their own bearings, increasing the dimensions and metal consumption of the device (pulley block) and reducing the working zone of the displacement of the hook suspension (movable axis with blocks).

The objective of the utility model is to develop the construction of the chain hoist with an increased working zone of displacement of the movable axis (hook suspension) while maintaining its previously adopted parameters.

This is achieved by the fact that, in contrast to the well-known technical solution of the polyspast, in it the element for winding-unwinding of a flexible organ is made in the form of two drums with the same working diameters, in the space between which there is a set of stationary pulley blocks, enveloped by the same flexible organ and connected by separate ends with the working surfaces of the individual drums.

In FIG. 1 presents a diagram of the pulley of the proposed design.

The polyspast of FIG. 1 comprises an axis 1 movable in space with a set of movable blocks 2 mounted on axis 1 movably in a tangential direction. Axis 1, depending on the use of the chain hoist, kinematically connected with the executive working body. On the shaft 3, installed in the bearings of the bed 4, are rigidly fixed: two drums 5 and 6 with the same working diameters, in the space between which there is a set of fixed blocks 7. On the drums 5 and 6, a flexible body is fixed and wound (wound) onto them 8, the envelope of blocks 7 on the shaft 3 and blocks 2 on the movable axis 1.

Depending on the use of the chain hoist, the drive to the shaft with a mechanical drive is carried out, for example, from a gearbox, with a manual one, for example, from a special sprocket with a drive chain.

The tackle works as follows. When creating a rotation of the shaft 3 (drums 5, 6) counterclockwise (Fig. 1 to look from left to right), the flexible body 8, winding on the drums 5, 6, reduces the distance between the shaft 3 and the axis 1.

With the reverse rotation of the shaft 3, the distance between the shaft 3 and the axis 1 increases.

In the case of fixing on the axis 1 of the cargo hook, the lifting or lowering of suspended loads is carried out.

Using the proposed construction of the tackle allows you to increase the working area of the displacement of the movable axis (hook suspension) of the tackle, for example, the height of the load while maintaining its other parameters, simplify the design, reduce metal consumption.

Claims (1)

A polyspast containing a movable axis with a set of movable blocks, enveloped by a flexible body, fixed by ends on an element for its winding-unwinding, mounted motionless on a drive shaft in the bearing supports of the bed, characterized in that the element for winding-unwinding of a flexible organ is made in the form two drums with the same working diameters, in the space between which there is a set of fixed pulley blocks, enveloped by the same flexible body, and connected by separate ends to the working surfaces from effective drums.

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