SU426159A1 - VIBROSTAND - Google Patents

Description

The invention relates to the field of testing products when exposed to a mechanical load, the vector of which rotates relative to the coordinate axes of the product. It can be used in the stands to determine the durability and calibration of various instruments and annunciations.

For such tests, the use of so-called double centrifuges and shakers with circular oscillations of the loading platform is known.

The circular vibration shaker contains a base, a loading platform and a drive for communicating a circular vibration to the platform, including a motor, a drive shaft, two cranks with the same adjustable radius, the fingers of which are connected to the platform, and a toothed synchronizer of rotation of the cranks.

However, when tested by this shaker, it is difficult to ensure stable synchronous movement of the two cranks; the introduction of a toothed synchronizer imposes parasitic oscillations on the main movement of the platform. The radius of the cranks is adjusted using rotary eccentric bushings, resulting in an undesirable change in the oscillation phase.

The purpose of the invention is to improve the accuracy of reproduction of a given law of oscillations.

This is achieved by the fact that the drive contains at least three cranks, each of which is made with radial guides for a finger, one of the cranks is equipped with a mechanism for radial movement of its finger and is directly connected to the drive shaft, and the synchronizer is made as

flexible transmissions.

The mechanism for radially moving the crank pin may, in particular, comprise a servo motor mounted on the base, a pair of screw-mounted screws on the crankshaft.

a nut and a kinematic chain of connection of the screw with the servomotor, including a differential located on the base, and a connecting shaft located inside the drive shaft.

FIG. 1 schematically shows the proposed shaker, a general view; in fig. 2 is a diagram of a vibrostand with a mechanism for radial movement of a crank finger. The stand contains base 1, cargo

platform 2, on which test article 3 is installed, is driven to communicate circular oscillations to the platform, including the engine 4, the drive shaft 5, at least three cranks 6, 7 and 8 with the same adjustable radius, fingers 9, 10 and 11 of which are connected to platform 2 , the synchronizer 12 of rotation of the cranks, made with flexible connections, such as a chain. Cranks 6, 7 and 8 are made with radial guides io, 14 and 15, respectively, for fingers 9, 1 and 11. One of the cranks, for example cree 3 jni Hii 7, is directly connected to the drive shaft 5 and is equipped with a mechanism for radially moving its lip 10, containing (CM. Fig. 2), a servomotor 16 mounted on the base I, a screw-nut 17 mounted on the crankshaft and a kinematic connection chain of the screw 18 with the servo-motor 16, including the differential 19, located on the base, and the connecting shaft 20 placed inside drive shaft 5. lipe power up Ate 4 begins to drive the leading crank 7, which drives the load platform 2 and, through it, cranks 6, 8. and 1 brake 12, ensures the accuracy ci-iHxpoinioro of rotation of all cranks 6, 7 and 8. Due to the fact that cranks 6, 7 and 8 have the same radius and location of their supports 21 on the loading platform 2 identical to the location of the supports 22 on the base 1, the loading platform 2 with the product to be used 3 makes an parallel-parallel movement along a circular path (t. e. circular oscillations). Thus, all points of the test article 3 receive the same centrifugal acceleration, i.e. the product is in a uniform zero of the centrifugal forces, the vector of which rotates relative to the test product 3. I change the acceleration (load) of the servo motor 16. The rotation of the servo motor is converted into the radial movement of the finger 10 of the crankcase 7, which leads to a change in the radius of the crank 7. The radius of the cranks 6 and 8 also changes by the same amount, since their lip 9 and 11 are displaced in the radial guides 13, 15. For ab scheni acceleration time of the loading platform 2 is necessary that the reduced moment of inertia of the rotating masses was as small as possible. According to these considerations, the synchronizer 12 is implemented as a mechanical transmission with flexible couplings. The subject of the invention is 1. A vibration table, including a base, a cargo platform, a drive for communicating a circular oscillation platform, a motor, a drive shaft, cranks with the same adjustable radius, the fingers of which are connected to the platform, and a crankshaft synchronizer, characterized in that reproducibility of the given law of oscillations, the drive contains less than three crankshafts, each of which is made with radial guides for a finger, one of the cranks is equipped with a mechanism for ceiling elements moving his fingers and directly bonded to nrivodnym shaft, and a synchronizer configured as a transmission with flexible linkages. 2. A vibration stand according to claim 1, characterized in that the mechanism for radial movement of the crank pin comprises a servomotor mounted on the base, a screw-nut pair mounted on the crank and a kinematic chain of connection of the screw with the servo motor, including a differential located on the base, and a connecting shaft placed inside the drive shaft.