RU2264348C2 - Block - Google Patents

Abstract

FIELD: timber industry.

SUBSTANCE: invention relates to lifting-and-transporting mechanisms and it can be in guide devices for cable systems. Proposed block has combination with groove installed on axle and made of modified wood sectors forming central disk with end face arrangement of wood fibers on surfaces in contact with support and with cable, said disk being clamped between two metal disks. Central disk rests through its surface from side of inner diameter of saddle-shaped support surface, one half of which is made on metal bushing fitted for sliding on axle. Clearance is formed between saddle-shaped support surface and corresponding surface of roller for deflection of roller in either side. Second half of saddle-shaped surface is made in thickening on axle. Sizes of thickening correspond to sizes of bushing. Thickening and bushing elements are installed opposite top each other in mirror-like manner.

EFFECT: simplified design of support surface for block roller.

2 dwg

Description

The invention relates to hoisting-and-transport mechanisms and can be used in guiding devices for rope rope systems of the timber industry complex.

Known cast rope blocks of hoisting mechanisms containing a rim with a groove and a hub connected by oval-shaped knitting needles [1]. In such blocks, the rope and the block quickly wear out at the points of contact of the rope with the groove due to the occurrence of contact stresses and deviation of the rope in the transverse plane (variability of the angle of deviation).

Known rope block [2], containing a roller, the rim of which is made with a groove in which there is a corrugated insert with a corrugated surface having the form of prints of strands of rope. The corrugated insert includes elastic compensators in the form of U-shaped protrusions located in the grooves of the rim. This design of the rim provides a more uniform distribution of contact stress between the rope and the groove and partially moves with a transverse deflection of the rope.

A disadvantage of the known design is the complexity of the manufacture and fastening of the corrugated support insert in the trench of the block.

Known rope block [3], selected as a prototype, the roller of which is made of modified wood sectors (DM), forming a disk having an end face arrangement of fibers on the contact surfaces with metal half-sleeves (left and right) and the rope. The half-sleeves serving as a supporting surface for the roller are planted on the axis of the block and form a saddle surface. This unit allows you to reduce contact stress between the roller chute and the rope and "track" the angle of deviation of the rope to 3 °, which positively affects the service life of the steel rope. The disadvantages of this design are: the manufacture of two half-sleeves; an emphasis for the left half-sleeve and its tight landing.

The invention solves the problem of simplifying the design of the supporting surface for the roller block.

This is achieved by the fact that in a rope block containing a combined roller with a chute, mounted on an axis and made of modified wood sectors, forming a central disk with an end arrangement of wood fibers on the contact surfaces with the support and with the rope, sandwiched between two metal disks, and surface of the inner diameter of the Central disk rests on a saddle-shaped supporting surface, one half of which is made on a metal sleeve having a sliding fit n and the axis, and between the saddle-shaped supporting surface and the corresponding surface of the roller, a gap is formed for deflecting the roller in both directions, according to the invention, the second half of the saddle-shaped surface is made in the thickening on the axis, and this thickening has dimensions corresponding to the dimensions of the said sleeve, and the elements of the thickening and the sleeve are located mirrored with respect to each other.

In the present invention, the left half sleeve is excluded from the design of the prototype block as a separate part and emphasis, and their functions are performed by thickening on the axis corresponding to the dimensions of the right half sleeve, which not only simplifies the design, but also the assembly of the block in comparison with the prototype.

According to the outer diameter of the roller in the DM, a groove is made with a depth of (1.2-1.5) dk and a radius of (0.52-0.53) dk, where dk is the diameter of the rope.

The permissible load on the block of this design is up to 100 kN (10 tf). Making a roller using DM reduces the metal consumption for block manufacturing.

The design of the block is shown in figure 1 is a General view and figure 2 is a section along aa.

The rope unit 1 consists of a combined roller 2 and axis 3. The roller consists of two elements: a central disk assembled from sectors 4 DM, and two metal disks 5 (each 10 mm thick) that clamp the disk from the DM from two sides with bolts 6 with nuts 7. For reliability of the disk coupler, special engraving washers 8 are installed that compensate for the change in the DM swelling pressure in the pressing direction, i.e. they compensate for the relaxation of internal stresses that occur in the wood over time under the influence of the changing temperature and humidity conditions of operation of the unit, and also fix the nuts 7 and prevent their loosening.

On the axis 3 there is a saddle-shaped supporting surface 7, which performs the function of a sliding bearing, consisting of two parts: the left part 9, which is integral with the axis, and the right one in the form of a half-sleeve 10 mounted on the axis with a slight interference fit (sliding fit). The half-sleeve 10 is securely clamped on the axis of the nut 11. To ensure constant pressure and fixation of the nut 11, a special roving washer 12 is installed under it, which prevents its turning.

The rope unit operates as follows.

The rope stocked through the block contacts the DM, which has a lower modulus of elasticity in comparison with the wire of the rope, which allows them to create a “bed” in it and, thus, increase the contact area, and the gap between the saddle surface on the axis of the block and the oval shape of the roller along the inner diameter allows him to "track" the lateral deviations of the rope left or right up to 3 °, which together positively affects the service life of the steel rope.

Sources of information

1. USSR author's certificate No. 468873, B 66 D 3/08, 07/05/73. Bull. No. 16.

2. USSR author's certificate No. 1212927, B 66 D 3/08, 02/23/86. Bull. Number 7.

3. RF patent for utility model No. 34155, B 66 D 3/08, 11/27/2003. Bull. No. 33.

Claims (1)

A rope block containing a combined roller with a chute mounted on an axis and made of modified wood sectors forming a central disk with an end arrangement of wood fibers on the contact surfaces with a support and a rope, sandwiched between two metal disks, with the central disk being on its inner diameter side relies on a saddle-shaped supporting surface, one half of which is made on a metal sleeve having a sliding fit on the axis, and between the saddle-shaped a clearance for deflecting the roller in both directions is formed, characterized in that the second half of the saddle surface is made in a thickening on the axis, and this thickening has dimensions corresponding to the dimensions of said sleeve, and the elements of the thickening and the sleeve are mirrored with respect to to each other.

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