SU541661A1 - Device for simultaneously stretching a group of large threaded fasteners - Google Patents

Description

one

This invention relates to assistive devices used during assembly, and also to tension devices, adaptations of mops bopt to etc. large threaded nei; bix parts.

To stretch a group of such fasteners located around the circumference. For example, flange connections created devices in which each of the stretchable fasteners of the group correspond to individual hydraulic pipes fed by a pipe from an IJ power main.

In addition to the complexity of the design and bulkiness, such devices also do not provide the ability to simultaneously stretch the fasteners at small distances between them.

This drawback does not have a known device for simultaneously extending a group of large threaded parts located around the circumference, containing a cylindrical base and a cover with holes for fasteners, between which a sealed cavity is formed by means of an o-ring, communicating with a high-pressure pump, and also auxiliary nuts for transferring tensile stresses from the crank to the saddle parts 2d. However, the formation here of an airtight cavity by the piston of the lid and the base cylinder, which is also located in the area of the fasteners circumference, limits the working area

0 this cavity. This, in turn, requires the use of a very high working pressure, which is necessary for the required expansion of fasteners.

In order to eliminate this shortfall, the annular seal of the proposed device is made enveloping, the hole for fasteners, and the sealed cavity is provided with additional annular seals, encompassing

0 each of the fastener holes.

FIG. 1 shows the proposed device, a cross-section; in fig. 2 - the same, top view; in fig. 3 - view A

Claims (2)

5 in FIG. 2; in fig. 4 - BB permit for:, -, flitA B for fiG, flg, 3; ji-s. 1., 6 - uszeg yde; KT krpo1G; 1, base USTRAC: PA-2, I jiipesiiHicujiie pins 3 to provide rxxiN:; ;;; i-; HOCTH movement swamp-. to along the axis; - pacTHrHBaeiva.iX fasteners Д817; Л8Й 4, retainers 5 sp. the gap between the gap between the axle hinge 1 and the base 2 in kerabo gggmay. Sealed cavity b between the roof. This 1 and base 2 is formed by an annular seal 7 concentrating the apertures 8 for fasteners 4, and the concentric rings Oj are concentric. spanning each of these holes. For niping out the extrusion of the sealing; material from the grooves are steel rings 10 and 11 (Φ, ig. B), to provide access to the nuts 12 to be tightened, in the lower part of the bovine 2 there is an annular recess 13 that intersects the cavities under nuts 12; A fitting 14 is screwed into the base 2, through which a working fluid is fed to the hermetic chamber; a small cavity with a high-pressure pump jack (not shown). The device is mounted on the flange 1 so that the ends of the fasteners 4 pass into the corresponding holes in the cover 1 and the base 2. On the part of the fasteners 4, protrude above the lid 1, screw the auxiliary nuts 16 all the way into the cover 1. Through fitting 14 in sealed cavity 6 serves under pressure. lsdk - st. Cover 1 at the same time, move;. Yerh, stretch all fasteners at the same time; ; e details 4 to the desired value. After this, the gaYuH 1.2 with the help of a key 17, which was pushed into the radial holes of STK2: -a.e.k-. turn to their stop in noBRp; r.i: i.v; Tb flange 15, then relieve pressure, unscrew the auxiliary nuts 16 to remove the device. The device can be used to disassemble an analogous unit. The only difference is that after the pressure is supplied to the hermetic cavity, the nuts 12 are unscrewed. Monitoring stress tightening fasteners can; o produce according to the pressure of the fluid in the hydraulic system. Apparatus of the Invention A device for simultaneously extending a group of large threaded fasteners. &Amp; 5 circumferentially containing a cylindrical base and 1 FUSC with holes for fasteners, between which, using a collar, formed a sealed cavity communicating with a high-pressure pump, as well as auxiliary nuts to transfer the tension force from the cover to the fasteners, characterized in that, in order to reduce the working pressure necessary for the required tension to of the fasteners, by increasing the working area of the sealed cavity, the annular seal is made covering the hole for fasteners and the sealed cavity is provided with additional annular seals covering each of the holes for fasteners. Sources of information taken into account during the examination: 1. French Patent No. 1402242, cl. In the 25th, 1965. 2. Patent of Germany No. 1246627, cl. 87a 22, 1967. willow s - s Fiz. lilv Knot -g Fig. &