SU1631317A1 - Device for measuring of friction of members moving one along another - Google Patents

Abstract

This invention relates to instrumentation engineering and can be used in mechanical engineering for determining mutual friction force. This invention relates to instrumentation engineering and can be used in mechanical engineering for determining the friction force of interchangeable parts, in particular, the frictional force between the compactor and the plunger of the universal preventer. The purpose of the invention is to improve the accuracy of measuring the friction force between the seal and the plunger of the universal preventer. Fig. 1 shows the proposed device in Fig. 2 - section A-A in Fig. 1 (installation diagram of moving parts, in particular, friction force between the compactor and the universal preventer plunger. The purpose of the invention is to improve the accuracy of measuring the friction force between the sealant and the universal plunger The device contains a plunger 1 in contact with the seal 2, which are located in the housing 3 of the preventer. In the plunger 1 along the generatrix surface in contact with the seal 2, the longitudinal straight line is milled A groove 4 in which a movable liner 5 made of plunger material is mounted on the rolling bodies 6. From falling out of a rectangular groove 4, the movable liner 5 is held by means of a silovansy receiving element 11 mounted on a cantilever ledge of an annular strain gauge element 12 which is mounted in the groove of the shank 13 of the plunger 1. 3 il. go liner on the body rolling); on fig.Z - section BB in figure 1.2 (the installation of the bearing in the body of the plunger, end view). The device comprises a plunger 1 in contact with the seal 2, which are located in the housing 3 of the preventer. In the plunger 1, along the generatrix of the surface in contact with the seal 2, the rectangular groove 4 is milled, in which a movable liner 5 is made of plunger material. The outer surface of the movable liner 5 has S (L s O CЈ Lp

Description

equal to the outer surface of the seal 2 and the inner surface of the plunger 1 curvature. The movable liner 5 is flush with respect to the inner surface of the plunger 1. The inner surface of the movable liner 5 is a flat rectangle and rests on the hollow rollers 6 mounted in the rolling supports 7 on the axis 8. In turn, the axis 8 is installed in the rolling supports 9 mounted in the special seating slots 10 of the rectangular groove 4, Thus, the hollow rollers 6 have the possibility of free rotation about the axis 8. The movable liner 5 is prevented from falling out of the rectangular groove 4 by means of a power-receiving element 11 mounted on the cantilever flange of the annular enzometri- Silovosprinimayu- chemical elements 12. The conductive member 11 mounted on an annular strain gauge element 12 is a force sensor. After assembling the device, the force sensor must be drained. The annular strain gauge element 12 is mounted in the groove of the shank 13 of the plunger 1. In the preventer housing 3 there are holes 14 and 15 for supplying the working medium of the preventer control system.

The device works as follows.

If it is necessary to close the preventer, the control system (oil) pressure medium is fed through the opening 14 into the sub plunger cavity. As a result, the plunger 1 begins to move upwards. Since the inner surface of the plunger 1 in contact with the seal 2 is conical, the seal 2 deforms upward in the radial direction as the plunger 1 moves upwards. Due to the fact that there is friction between the outer surface of the seal 2 and the inner surface of the plunger 1, the movable liner 5, supported by the hollow rollers 6 freely rotating about the axis 8, lags behind the plunger 2, putting pressure on the force-receiving element 11 of the ring strain gauge - a rim element 12. Installation of hollow rollers 6 and axis 8 in supports

Rollers 7 and 9 minimize the resistance to movement of the movable liner 5 relative to the plunger 1 along a rectangular groove 4. In addition, the rolling friction forces present at the node are incommensurably small compared to the frictional forces between the movable liner 5 and the compactor 2. Therefore, the force perceived by the force sensor is the frictional force between the surfaces of the movable liner 5 and the compactor 2. The total frictional force between the compactor 2 and the plunger 1 when moving the latter can be calculated by the formula

F F8Kt1. TRTR S6Kn

(one)

Zpl

where Ј t is the full force of friction between the plunger and the compactor; FT is the frictional force between the movable liner and the compactor, registered by the force sensor;

- outer side surface of the seal; SgKt) is the contact area of the seal with the movable liner.

Since there is a stable connection between Ptr and F ((8pl: S8Kn con const ratio), therefore, dependence (1) can be taken into account when calibrating the force sensor, with the result that the force registered by the sensor will be equal to the desired friction force F7p.

Claims (1)

Invention Formula A device for measuring the friction force of mutually moving parts, comprising a plunger with a groove, a sealant, an annular strain gauge force sensor, characterized in that, in order to improve the measurement accuracy, it is equipped with a movable liner in contact with the strain-resistor force sensor and the rolling elements installed in the groove of the plunger with the possibility of rotation around its axis, while the outer surface of the liner is made with a curvature equal to the curvature of the plunger, the inner surface of the liner in contact with the rolling bodies It is flat and the groove is rectangular. A - A / turned / FPG.1 Compiled by N.Vovchuk Editor I.Sogl nikTehred L.Serdyukova Order 536 Circulation 351 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 FIG. 2 B - B / rotated / Proofreader M.Maksimishinets Subscription