SU1682158A1 - Device for tightening large threaded connections - Google Patents

Abstract

This invention relates to devices for tightening and loosening large threaded connections. The purpose of the invention is to improve the quality of tightening and reliability. When tightening the threaded joint, the half-sleeves 7 and 8 of the wedge mechanism 1 are moved apart in the radial direction by means of hydraulic cylinders of the pressure mechanism interacting with the projections 10 of the washer 9. The half-washers 7 and 8 are fixed by means of plates 17 If necessary, the pair of half-washers 11 are moved and 12. The fixing of the latter is carried out with a collapsible collar 18 1 Cp. of the file, 2 sludge.

Description

17

/

17

The invention relates to devices for tightening large threaded connections in press-forging equipment, shipbuilding, heat and power engineering,

The purpose of the invention is to simplify the design and reduce the radial dimensions.

FIG. 1 shows the device, a general view; in fig. 2 is a section A-A in FIG. one.

The device for tightening large threaded connections contains a wedge mechanism 1 and a pressure mechanism 2, a wedge mechanism 1 is installed between the nuts 3 and 4 and the part to be joined 5.

The entire device is mounted on a threaded fastener 6. The wedge mechanism 1 is made in the form of a pair of half washers 7 and 8, intended for tightening a threaded connection and having oppositely directed inclines, washers 9 with counter inclined surfaces for installing half washers 7 and 8, having projections 10 located between the ends of the half washers 7 and 8, and a pair of half washers 11 and 12 designed to loosen the threaded joint, and washers 13 with protrusions 14 located between the ends of the half washers 11 and 12.

To reduce the frictional force on the working surfaces of the part 4 to be joined, washers 15 and 16 were installed,

The semi-washers 7 and 8 are fixed with locking plates 17, and the semi-washers 11 and 12 are fixed with a folding collar 18.

The pressure mechanism 2 (Fig. 2) is made in the form of two high-pressure hydraulic cylinders 19 located along each wedge semi-washer 7, 8, 11 and 12 on the side of their ends facing the projections 10 and 14, respectively. In the cylinders 19, packed pistons 20 are placed. The cylinders 19 are connected by pipes 21 with a source 22 of pressure, for example, a high-pressure manual pump (not shown).

The device works as follows.

The device is pre-installed on a threaded connection (fig. 1) w is tightened by nuts 3 and 4 in order to select gaps. The semi-washers 11 and 1k are fixed when they are pressed completely against the protrusions 14 of the washer 13 with a collapsible collar 18. Then from the pressure source 22, pressure 21 is applied to the hydraulic cylinders 19 half-sucks 7 and 8, Pistons 20 hydraulic cylinders 19 placed in the wedge semi-washers 7 and 8 , abutted with projections 10 of the washer 9, and half-washers 7 and 8 are displaced in the radial direction. Due to the inclined surface

Steps of the half washers 7 and 8 in the threaded connection create a calculated axial tension. The slope of the inclined surfaces of the half washers 7 and 8, equal to, for example, 1:10, ensures their optimum radial displacement. After extending the half washers 7 and 8 by a calculated amount, between their opposing ends and the protrusions 10 of the washer 9, fixing plates 17 are installed. Thus, the half washers 7 and 8 are fixed, and the threaded connection receives the necessary tightening force. Then, pressure is released from the hydraulic cylinders 19 and the pipeline 21 is disconnected.

When disassembling the threaded connection, the work is carried out as follows.

The collapsible clamp 18 is removed. The hydraulic cylinders 19 of the half-washers 11 and 12 are pressurized through the pipe 21 from the high-pressure source 22. The pistons 20 abut against the protrusions 14 of the washer 13, the half-washers 11 and 12 are displaced radially from the center of the threaded joint to loosen the tightening of the threaded joint. The pressure source 22 with conduit 21 is disconnected from the cylinders 19 and the half washers 11 and 12.

In order to reduce the frictional forces on the surfaces of the half-washers 7, 8, 11 and 12, during the pre-assembly, a plastic lubricant can be applied with a filler in the form of a solid lubricant, such as molybdenum disulfide (MoSa).

Claims (2)

1. A device for tightening large threaded connections containing wedge-type pressure mechanisms, characterized in that, in order to simplify the design and reduce the radial dimensions, the wedge mechanism is made in the form of two washers with protrusions and inclined surfaces and two pairs of half-washers designed one for tightening, and another for loosening a threaded joint, having oppositely directed inclines and installed on reciprocal inclined surfaces of the washers, and the pressure mechanism is made in the form of high-pressure hydraulic cylinders, whelping at facing ends of the protrusions polushayb. 2. Device pop. 1, in order to increase reliability, it is provided with a pair of half washers installed between the ends, intended for tightening a threaded joint, and a lug fixing plates and a folding clip covering the other pair of half washers. Aa 21 FIG. 2