SU1252700A1 - Resonance bench for testing shafts - Google Patents

Abstract

The invention relates to a testing technique and can be used to test shafts for cyclic strength. The aim of the invention is to improve the quality of the test shafts, which is achieved by changing the ratio between the cyclic bending and twisting moments acting on the shaft during the tests. For this, the loading device is made in the form of two masses in the vertical direction which are spring-loaded, with grippers dp of the test shaft. On one of the masses fixed directional vibrator with a turning mechanism relative to this mass. The rotation is carried out by changing the number of revolutions of the vibrator due to the use of a jertial type speed controller in the rotary mechanism. 2 Il. with S (/

Description

one

The invention relates to a test technique and can be advantageously used for testing cyclic strength.

The purpose of the invention is to improve the quality of shaft testing by changing the ratio between the cyclic bending moment and the cyclic torque acting on the shaft during the tests.

FIG. 1 shows a stand, an obgcny view; figure 2 - view A. on figure 1.

The stand consists of two masses 1 with clips 2 for fastening the test shaft 3. On one mass 1 a directional vibrator 4 is installed with a drive from the engine 5 through the propeller shaft 6. The vibrator 4 is equipped with a turning mechanism made in the form of an external 7 and internal 8 ps-lump and inertia type speed controller 9.

The outer coupling half 7 is rigidly connected to the housing of the vibrator 4 and is made with a screw groove 10 on the inner surface. The inner half coupling 8 is provided with spikes 11 on the outer surface entering the helical groove 10 of the outer coupling half 7, is mounted for axial movement and connected by a speed controller 9 to the vibrator shaft 4. The vibrator 4 is fixed on the weight 1 in bearings 12. On the shaft 3 is mounted indicator 13.

The stand works as follows.

The test shaft 3 with the indicator 13 is fixed with the clips 2 to the masses 1. The engine 5 rotates the shafts of the vibrator 4 through the drive shaft 6. Kinematically connected

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With the shaft of the vibrator 4, the centrifugal speed controller 9 at a constant frequency of rotation of the engine 5 provides a predetermined isolation of the bending and twisting loads acting on the test shaft 3. When the rotational speed of the engine 5 is changed, the position of the weights of the speed controller 9 changes, and due to the axial

 moving the inner coupling half 8, the outer coupling half 7 is rotated together with the vibrator 4 in the bearings 12. This achieves a change in the ratio of the acting

 5 per test shaft 3 bending and torsion loads.

Claims (1)

Invention Formula 20 Resonant test stand for shafts, containing a base, mounted on the base two masses in a vertical direction, spring-loaded with clamps for fastening the test shaft, a directional vibrator placed on one of the masses, and an indicator that quality test shafts vibrator 30 is equipped with a rotation mechanism, made in the form of outer and inner coupling halves and a speed controller of inertial type, the outer coupling half, executed in the form of a sleeve, 35 is rigidly connected to the body of the vibrator and has a screw groove on the inner surface, the inner coupling half is installed coaxially with the outer axial displacement possibility, equipped with spikes, the entrance to the helical groove of the outer coupling half, and connected via a speed controller to the vibrator shaft. 25 h / FIG. 7 Compiled by V. Chernov Editor O. Bugir Tehred V. Kadar Proofreader S. Iekmar 4617/45 Circulation 778 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk iab., d.A / 5 Production and printing company, Uzhgorod, Projecto st., 4