SU1300317A1 - Bench for self-unscrewing test of threaded connection - Google Patents

Abstract

The invention relates to measuring and testing equipment, in particular to devices for testing the self-unscrewing of a threaded joint. The goal is to increase the accuracy of research. The stand contains the base and a fragment of the threaded pair, 7 rack with lock. The rack is made in the form of a ring, which is mounted on the base at the required angle from 0 to 360. The threaded rod is fixed on the ring, the tool is made in the form of two micromirrors; one mirror is mounted on the rod, the other - on the nut. The assembled device is subjected to vibrations in the plane perpendicular to the base 1. At the same time, the threaded pair is affected by vibratory loads oriented to the axis of the joint at a certain angle. Due to this, the conditions of real threaded connections are more accurately simulated. 5 hp f-ly, 9 ill. and (L GO (U o o Sla L,

Description

The invention relates to measuring and testing equipment, namely, devices; tests for self-unscrewing of the threaded joint.

The aim of the invention is to improve the accuracy of the study.

FIG. 1 shows a stand, a general view, node I, option I; FIG. 2 shows section A-A in FIG. one; in fig. H - node I in FIG. 1, option II; in fig. 4 - the same, option III (making a nut with inertial masses); in fig. 5 - the same, option IV; in fig. 6 - the same, version V (implementation of the inertial mass in the form of a sleeve); in fig. 7 - the same, option VI (assembly with bearings and spring); in fig. 8 - the same, option VII; in fig. 9 - measurement system.

The stand contains a base 1, a fragment of a threaded pair in the form of a rod 2 and a nut 3. A basic micromirror 4 is mounted on a threaded rod, and a measuring 5 is mounted on a nut. Rays of light from lasers 6, reflecting from micromirrors 4 and 5, fall on the screen-scale 7. Rack 8 is made in the form of a ring with the possibility of its installation on the base at different angles of H. The retainer (Fig. 2) is made in the form of bolts 9, which are passed through the holes 10 in the ring, the nuts 11 and the washer 12. The nut can be made (Fig. 3) in view of the two semi-nuts 13 and 14, screwed together by 15 screws An additional nut mass is provided by a set of rings 16 and 17 (Figs. 4 and 5). With the aid of a screw 18 and a sleeve 19, the nut is eccentricized.

With the help of thrust bearings 20 and 21 and 22 with springs 23, the effect of axial pulling force on self-loosening is determined. With the sleeve 24 and the strain gauges 25 on it, the connection is made and measured.

The stand works in the following way. The threaded rod 2 is set relative to the base 1 by the required angle f with the aid of a stand 8. Next, the beams of light are directed from the lasers 6 to the fixed 4 and the moving

In this case, in the plane perpendicular to the base 1, the test thread pair, consisting of the threaded rod 2 and the nut 3, is affected by 5 vibratory loads oriented to the joint axis at an angle H. The amount of self-unscrewing is determined by the form

ten

-J rJ - “I.-.

e l

Where

L I 15

25

thirty

distance from micromircap to screen;

moving the bunny around the screen.

The self-unscrewing speed is onpefted as a first time derivative d. To study the effects of gaps or tensions (fig. 3), 20 masses (fig. 4), moment of inertia (fig. 5), mass eccentricity (fig. 6), axial force (fig. 7), and real forces and moments (Fig. 8) provided the assembly (Fig. 3-8), work with which is similar to that described. The nut 3 can be single-turn and round with a minimum eccentricity, as well as in the form of two half-nuts 13 and 14, tightened by adjusting screws 15, which allow you to set the required clearances or tension.

To study the effect of the weight of the nut on the self-unscrewing of the nut 3 35, inertial masses are fixed on both sides in the form of a set of rings 16 and 17.

To study the effect of the mass of the nut eccentricity, a sleeve is attached to the latter by a radial screw 18.

To investigate the effect of axial puff force on self-unscrewing

The 45 rods are fitted with two thrust bearings, one bearing 20 is mounted on the rod, and the other bearing 21 is mounted on the nut, and the holder 22 with calibrated

50 springs 23 squeeze.

A sleeve 24 with longitudinal slits may be worn on the rod. The slits provide an axial elastic 5 micromirror so that the yielding of the sleeve, and the deformation of the reflected rays to fall on the sub-petals of the sleeve successfully allow the vizim screen scale of 7 at one point. apply strain gauge with assisted and configured with a device attached to them, strain gauge is exposed to vibrators 25.

03172

In this case, in the plane perpendicular to the base 1, the test thread pair, consisting of the threaded rod 2 and the nut 3, is affected by 5 vibratory loads oriented to the joint axis at an angle H. The amount of self-unscrewing is determined by the formula

ten

-J rJ - “I.-.

e l

Where

L I 15

25

thirty

distance from micromircap to screen;

moving the bunny around the screen.

The self-unscrewing speed is onpefted as a first time derivative d. To study the effects of gaps or tensions (fig. 3), 20 masses (fig. 4), moment of inertia (fig. 5), mass eccentricity (fig. 6), axial force (fig. 7), and real forces and moments (Fig. 8) provided the assembly (Fig. 3-8), work with which is similar to that described. The nut 3 can be single-turn and round with a minimum eccentricity, as well as in the form of two half-nuts 13 and 14, tightened by adjusting screws 15, which allow you to set the required clearances or tension.

To study the effect of the weight of the nut on the self-unscrewing of the nut 3 35, inertial masses are fixed on both sides in the form of a set of rings 16 and 17.

To study the effect of the mass of the nut eccentricity, a sleeve is attached to the latter by a radial screw 18.

To investigate the effect of axial puff force on self-unscrewing

The 45 rods are fitted with two thrust bearings, one bearing 20 is mounted on the rod, and the other bearing 21 is mounted on the nut, and the holder 22 with calibrated

50 springs 23 squeeze.

31

Claims (6)

1. Stand for self-unscrewing tests, a threaded joint containing a base, a stand with an angular position fixer and inertial masses, a threaded pair with a rod and a nut, a means of measuring pairs of diameters, so as to improve the accuracy of the test The stand is mounted in the form of a ring fixed on the base, the rod is fixed on the ring as a cantilever, while the measuring instrument is made in the form of two microfused, one of which is fixed on the stem and the other can be moved on the nut Ikov light and screen. 2. The stand according to claim 1, which differs from the fact that the nut is made single-turn. 3. Stand popp. 1-2, characterized in that, in order to investigate the influence of the gap and the tension /; - / 7 / year Schtttt W with 174 in the screw thread, the nut is made in the form of two half-nuts, which are screwed together with the adjustment screws. 4. Stand popp. 1-2, characterized in that, in order to study the effect of the nut mass on self-loosening, the inertial masses are made in the form of a sleeve or rings, the latter being fixed to the nut on both sides. 5. Stand popp. 1-2, characterized in that, in order to investigate the effect of the moment of inertia of the nut on the self-loosening, the rings are assembled into a bag, fastened together and mounted on the nut in the radial direction. 6. Stand Popp. 1-2, characterized in that, in order to investigate the effect of axial pulling force on self-unscrewing, it is equipped with two stop podmpnik mounted on the rod and a clip with a calibrated compression spring located between them. /; - / 9 WITH FIG. g fig.Z varisg // tJ 76 figl X. effpt ta / nlf FIG. five I daftuaf / nl 6 Variam / YY gz 22 20 l K. Voposhchuk tpai9 Compiled by S. Chukaeva Tehred I. Popovich Ba / 3 {/ of // 77 W Proofreader A. T sko Order 1141/40 Circulation 777 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4