SU1638382A1 - Device for calibration and manufacturing control of torsion shafts - Google Patents

Abstract

The invention relates to mechanical engineering, in particular to test equipment. The purpose of the invention is to improve measurement accuracy. The device contains the supporting and loading units. The supporting unit includes the locking shaft holder 13, and the loading unit - supporting holder 6, mounted rotatably in bearings 4 and rigidly connected to the lever sector 7. The latter contains the scale of the loading torque error from the action mass of the lever sector and a movable scale indicating the angle of torsion of the torsion shaft. The lever sector is set vertically relative to the torsion shaft and in the center of the scale there is a large-scale plummet lever. is engaged in a flexible element with a loading screw through a dynamometer. At the weakest cross section of the shaft are installed strain gauges 1 З p f-ly 4 or

Description

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The invention relates to mechanical engineering, in particular to testing equipment, and can be used on stands of a closed power circuit for testing gear and other gears,

The purpose of the invention is to improve the measurement accuracy when testing various gears by calibrating and controlling torsion shafts outside the test bench with minimal errors.

FIG. 1 schematically shows the proposed device for calibration and control of torsion shafts for a test bench, a general view; in fig. 2 - supporting and loading device nodes, a section; in fig. 3 is a diagram of the action and registration of forces creating a moment from the mass of the lever; in fig. 4 - device, axonometrics.

A device for calibrating and controlling torsion shafts comprises a base 1 on which a vertical wall 2 is rigidly fixed, on which a loading unit is mounted, including a cup 3 rigidly connected to the wall 2. In glass 3 mounted on bearings 4, which are pushed through by a sleeve 5 (for the torsion shaft) holder 6, which is rigidly connected to the lever-sector 7. Co. the sides of the lever sector 7 bearings are adjusted by a ring 8. The glass 3 is closed from the end by a cover 9 and is rigidly connected to the base by an edge 10 {fig. 2).

The support unit of the device is made in the form of a stand and includes a plate 11 on which walls 12 are mounted supporting the fixing clip 13 of the torsion shaft 14 mounted on them. The latter is installed in the holder 6 and 13 using keys 15 and 16 (Fig. 2). ),

The lever sector 7 is connected via a cable 17 and a dynamometer 18 with a lead screw 19. The latter is mounted on the groove 20 of the wall 2 through the thrust bearing 21 and is kept from turning by the slider 22, which is rigidly fixed to the screw 19 and has the ability to slide along the groove 20 (Fig. 1). The lead screw is driven by a handwheel-nut 23. A cable 17 is clamped on the lever-sector 7 from the side opposite the running screw 19 to maintain a constant radius of the arm applying force to the lever sector.

The lever sector 7 contains two scales applied by taring (Figs. 3 and 4): A is the scale of the loading moment error as a function of the mass of the lever sector in the loading system; B - movable scale of indication of the angle of torsion of the torsion shaft in the process of loading. The lever sector is provided with a plumb arrow 24, which is pivotally mounted on the zero division O of the scale A located in the center of the weight of the lever sector 7.

The lever sector 7, together with the scales A and B and the plumb arrow 24, hinged at the center of the weight of the lever sector, form a kind of gravitational arrow combination indicator of the torsion angle

of the shaft and registration of the error of the moment introduced by the weight of the lever sector during the loading of the shaft. Such an indicator operates according to the principle of vector decomposition of the force of gravity P of the lever sector on PI and Pa

(Fig. 3), large-scale, made in the form of an arrow-plummet and graded grid, connecting the indicated scales. The counteracting power is sin.

The device works as follows.

The torsion shaft 14, before being installed on the stand for testing gearboxes in a closed loading circuit (not shown), is calibrated (controlled) by parameters

stiffness using the proposed device. For this, the torsion shaft 14 is installed with the help of keys 15 and 16 in the cages 13 and 6, respectively, of the supporting and loading nodes. On a dangerous section

the torsion shaft is glued with strain gauges 2.5 forming a permanent measuring bridge connected by conductors 26 to a strain gauge 27, for example ID-1, which can be fixed on wall 2

devices. Further, by rotating the handwheel nut 23, in one direction or another, the reading of the dynamometer is set to equal readings of the dynamometer and scale A. This operation unloads the torsion shaft from

act torque from the mass of the lever sector.

This position is the starting point of the loading torque on the torsion shaft. After that fix the reading of the strain gauge 27 and the movable scale B is set to the zero position for the convenience of counting the twist angle of the torsion shaft under loading. Further, rotation of the handwheel nut 23 produces a stepped

(with the required gradation of accuracy) loading the torsion shaft 14 by twisting it with the lever sector 7 through the key connection of the torsion shaft with the holder 6 of the loading unit specified (calculated)

torque moment, which is fixed by the indications of a dynamometer and strain gauge. In this case, a table (graph) of the dependence of the strain-gauge indications on the moment of the torsion shaft twisting is made.

The magnitude of the torque is determined as the algebraic sum of the indications of the scale A and the dynamometer 18 MDIN

D Mkr + Mzad.

For this, the prices of their divisions are made identical, for example, in Nm. The control at the stand of the magnitude of the load of the torsion shaft is carried out in three ways simultaneously; on the rigidity of the shaft according to the readings of the dynamometer Nm; according to the readings of the strain gauge B. Three values are interconnected by a schedule-passport to the torsion shaft. Subsequently, the torsion shaft is used together with the strain gauge on test benches to control the load on the gears.

The proposed device makes it possible to eliminate measurement errors introduced by the features of the stand design.

Claims (2)

1. A device for calibrating and controlling torsion shafts, comprising a support assembly with a shaft fixing shaft and a loading assembly comprising a lever-sector and 0 five 0 dynamometer with lead screw loading, characterized in that, in order to improve measurement accuracy, the device is equipped with strain gauges mounted on the shaft, the loading unit is equipped with a support sleeve for accommodating the end of the torsion shaft mounted for rotation and rigidly connected to the lever sector containing the reference scale of the moment of loading error from the action of the mass of the lever sector, a movable scale indicating the angle of torsion of the torsion shaft, and set vertically relative to the latter. 2. Device pop. 1, characterized in that the reference scale of the loading torque error from the mass of the lever-sector and the moving scale of indication of the torsion shaft twist angle are related to the graded grid and the plumb scale arrow set in the zero division of the first scale coinciding with the center of the lever plate. -sector // 13 eleven Figz