SU150713A1 - Tachometer type device for determining uneven shaft rotation - Google Patents

Description

Devices are known for measuring the speeds and non-uniformity of movement of rotating parts and machinery mechanisms, in which inert weights are used as a sensitive element, and inductive or capacitive sensors serve as transducers.

The proposed device differs from the known ones in that it uses a collector disk fixedly mounted on a roller, in which a high-frequency inductive sensor is placed in a cylindrical cavity, and an eccentric is attached to an inert weight by a screw passing through a rectangular notch of the disk. This embodiment improves the sensitivity of the device.

FIG. 1 and 2 shows a diagram of the device; in fig. 3 - a film with record of indications of the device.

A roller 3 with a tip 4 is built into the cylindrical case / and the back cover 2 on rolling bearings. Load 5 with a cylindrical pin 6 is mounted on the middle part of the roller on rolling bearings. Load 5 receives rotation from roller 5 through springs 7, the number of which can be up to three . Next to the load on the roller, a collector disk 8 of a dielectric material with a ring 9 is fixedly mounted. A coil 10 with ferrite rings and a ferrite rod is embedded in the cylindrical cavity of the disk 8 //. Through the rectangular notch of the disk 5, the eccentric 12 is fastened to the load 5 by means of a screw. The current is supplied by a current-carrying device 13 with a graphite rod. The eccentric 12 serves to set the average position of the ferrite rod // when setting the instrument.

No. 150713-2 -

With a uniform rotation of the roller 3 with the disk 8, the load 5, associated with the roller 3 by the springs 7, also rotates uniformly. Acceleration or deceleration of the roller 3 with the disk 8 causes the load 5 to advance or lag with the eccentric 12 within the gap between the pin 6 and the hole in the disk 8. This leads to the displacement of the ferrite rod // and the change in inductance. Instrument readings are recorded using a loop oscilloscope and amplifier.

A splash of 1 or a centerline shift is recorded on the film. By the size of the burst or shear and by its location, it is possible to judge the magnitude of the acceleration of the non-uniform rotation and analyze the cause of the non-uniform rotation of the links of the mechanism.

The device is calibrated under static conditions and consists of determining the sensitivity and amplitude response. Depending on the speed of rotation of the links of the mechanism, the sensitivity is regulated by the thickness and number of springs 7, as well as by the amplifier. The calibrated device has a stable characteristic.

Subject invention

A tachometer type device for determining the uneven rotation of the shafts, comprising a roller with a tip mounted in the housing, an inert weight associated with the roller by a flat spring (springs), a high-frequency inductive sensor and an eccentric to adjust the zero position of the ferrite core of the sensor, characterized in that increase sensitivity, the device is equipped with a collector disk fixedly mounted on the roller, in the cylindrical cavity of which a high-frequency inductive sensor is placed, and A carbon cut is made through a screw holding an eccentric to an inert load.

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