SU1221527A2 - Bed for testing geneva stop-motion - Google Patents

Description

The invention relates to mechanical engineering, in particular to testing equipment, and can be used to test Maltese mechanisms under the combined effect of several loading factors,

The aim of the invention is to reduce the duration of the tests by continuously applying to the shafts of the test mechanism of the loading moment, vibratory torsional vibrations and axial shock loads.

On the hedgehog schematically shows the stand.

The stand includes a housing 1, an actuator comprising an electric motor 2, a gear 3 and 4 and an eccentric output shaft 5. On the eccentric neck of the latter on radial-thrust bearings 6 and 7, the driving link of the Maltese mechanism under test is installed, for example, a flywheel 8 with a finger 9 interacting with the cross 10 of the tested mechanism, placed on the shaft 12 having an eccentric shaft 12 of the load device. The eccentric output shaft 5 is mounted in the housing 1 on sliding sliders (not shown), made movable and self-adjusting in the axial direction with the help of springs 13 and 14 and connected with a device for sampling gaps, including gear train 15 and 16, a worm pair 17 and 18 and the handle 19. The mechanism for creating an axial shock load comprises a cam actuator 20, a cup 21, a screw 22, a spring 23, and a striker 24. The latter interacts through the ball 25 with the end face of the output shaft 5.

The braking torque loader is two thrust bearings 26, facing each other two rings of which are pressed onto the shaft 12 all the way into the spring ring

27, and the other two - outer rings - are mounted in the housing 1 with the possibility of axial movement and fixed by means of an appropriate landing against rotation, and a pressing device, including a threaded bushing

28, the slider 29 and the spring 30 .. The flywheel 31 with adjustable inertia is fixed with a key 32 to the shaft 12. In the groove of the flywheel 31

in the diametral direction are fixed moved by the screw 33 with the left

and right-hand threads at the ends of the weights 34 and 35. The screw 33 is fixed against axial movement by its shoulders and shaft groove 12. Each primary and secondary exciter is, for example, 12 connecting rod 36, pivotally connected to the eccentric shaft 11, axle 37, slider 38 The electromagnets 39 are located around them. In this case, the rods 36 of the vibration exciters must be located under the ANGLE equal to 90, and the sliders 38 in the housing 1 at an angle chosen from the condition of creating uniform vibration loads at any angular positions entrika 11. Stand works as follows. The creation of torque on the Maltese mechanism is produced

by starting the motor 2, the rotation from which through gears 3 and 4, the gear of the flywheel 8 is transmitted to the finger 9, which rotates the Maltese cross 10.

Loading the braking moment of the shaft 12 with the Maltese cross 10 is performed by turning and squeezing the threaded sleeve 28 through the spring 29 of the spring 30, which presses on the bearings 26 and, pressing against the body 1, increases the moment of friction in them. This load is applied to the shaft 12 continuously.

A flywheel 31 with an adjustable moment of inertia creates an additional shock load of the finger 9 on the groove of the Maltese cross IO at the moments of the entrance and exit of the finger 9 (movement phase) from the groove due to an abrupt change in the law of motion of the Maltese cross 10.

Additional torsional load when finding the finger 9 in the groove of the Maltese cross 10 (mating

a cross groove - a finger, a motion phase) occurs when superimposed oscillations created in sliders 38, made, for example, on a nickel base, when an alternating current is passed through an electromagnet 39. These oscillations are transmitted through rods 36 to an eccentric 11 of shaft 12 with a frequency of 100 Hz.

At the time of stopping (fixation phase) of the Maltese cross 10, this load

continues to operate and causes additional wear of the coupling: the locking recess of the Maltese cross 10 is the locking part of the flywheel 8.

In order to intensify the running-in mode of this interface, a gap is selected in this interface, which is ensured by rotating the knob 19 through the screw pair 17 and 18, the gear train 15 and 16, and turning the eccentric shaft 5 of the flywheel 8.

An additional shock axial load with an adjustable impact force is created when the variable frequency cam actuator 20 rotates and acts on the firing pin 24, which strikes the spring-loaded shaft 5 of the flywheel 8 via the ball 25, and the springs 13 and 14 ensure that the flywheel 8 is self-installed after applying shock pulses. The frequency of strikes 50 Hz.

Thus, the flywheel 8 with the finger 9 has the ability to move along its axis, which leads to additional wear of the matings of the Maltese mechanism in the axial direction (the finger 9 is groove and the notches of the cross 10 are the locking part of the flywheel 8).

Claims (2)

1. Stand for testing Maltese mechanisms, comprising a housing. five 0 five 0 the drive, the output shaft of which is intended to install the driving member of the tires of the Maltese mechanism under test, the loader whose shaft is designed to accommodate the cross of the mechanism under test and has an eccentric, and an exciter connected to the eccentric, characterized in that, in order to shorten the duration of the test, it is equipped mounted on the body, perpendicular to the main additional vibration exciter, also garnished with an eccentric, a mechanism for creating an axial shock load, to which it interacts with the end face of the output shaft, and a kinematically connected device for sampling gaps, and the drive shaft is eccentric and spring-loaded in the axial direction. 2. Stand according to claim 1, characterized in that the loader consists of two thrust ball bearings, the rings of which are facing each other are fixed on the shaft of the loader and the outer ones are mounted in the housing with the possibility of axial movement and fixed against rotation, and act on the rings along the axis of the shaft device is pressed. 20 P 33 35 e S 5 "rff VNIIPI Order 1604/48 Circulation 778 Subscription Branch PPP Patent, Uzhgorod, ul. Project, 4 P IS