SU576521A1 - Apparatus for determining the value of unbalance of articles shaped as bodies of rotation - Google Patents

Description

one

The invention relates to the construction of devices for measuring the amount of imbalance in the static balancing of products in the form of bodies of revolution and can be used in mechanical engineering.

A device for static balancing of automobile wheels, comprising an axis, a rod with a linear scale mounted perpendicularly to the axis of the latter, and a measured weight, but not mounted on the rod 1, are known.

The disadvantage of the described device is the low performance of the balancing, due to the need to remove and install the load on the rod with each turn of the checked load.

The closest to the invention in technical dryness is a device for balancing automobile wheels, comprising a housing, a disk with a scale and an arrow located on the axis of the housing, a measured weight and a load rotation mechanism consisting of a two-stage gear with a worm gear. This device is structurally difficult to perform and, due to the presence of a two-stage transmission with a worm gear pair with a high gear ratio, does not provide the required accuracy of measurement 2.

To improve the measurement accuracy in the proposed device, the measured weight is made

in the form of the toothy sector, the disk is equipped with a second scale and an arrow rigidly fixed on the toothed sector; it is mounted coaxially with the latter, and the mechanism of rotation of the load is made in the form of an axis, with a gear wheel and spring placed on it, one end of which is fitted with tension on the axis and the other is fixed in a gear that is kinematically associated with the toothed sector.

Pa figs. 1 shows the proposed setupTBO for measuring the unbalance of a pulley; on phpg. 2 - Stret view, 1x A per phpg. one.

Pa mandrel 1 ustki-yvlspy bushing 2 p raiiKa 3 designed to mount the balancing pulley 4. The mandrels 5 and 6 mandrel mounted on roller supports 7. 1 flange 8 mandrel attached cylindrical housing 9 connected to the cover 10 of transparent material. An axle 11 of the cylindrical Cornus hinge connects the disk 12, a counterweight 13 and Hccynuiii angular HI feces 14 to measure the imbalance without taking into account the friction p1kalu 15 for friction torque. The motionless zero coupling 16 is fastened to the axis II, connected to the movable gear half coupling 17 by stops 18 and with arrow 19 and pesetas counterweight 20.

The measured weight is made in the form of a toothed sector 21, carrying an arrow 22. The ball sector Hiipiiu equips with axis 11 and hangs into engagement with the gear 23 of the turning mechanism. An axis 25 of the turning mechanism with a tension is seated 25, the end of which is bent and inserted into gears. Axis 24 carries a ball retainer 26, which on the inner surface of the gear corresponds to an annular recess 27. The gear wheel is provided with a stop shoulder 28 and a handle 29.

The device works in the following way.

Before operating, the device with the removed sectors 21 and the counterweight 20 is subjected to exact balancing. Into the sleeve 2 from the mandrel 1, insert the latter in the hole of the balancing pulley 4, then put the sleeve back on, fasten it to the mandrel, and tighten the nuts 3 between the two conical surfaces. Necks 5 and 6 mandrel with a pulley are placed on onory 7.

In the uncoupled position of the Ioule couplings 16 and 17 and the gear 23 of the turning mechanism, the mandrel 1 is rolled on roller bearings until a stable equilibrium is reached, in which the hard position of the pulley 4 is at the bottom and the unbalance plane coincides with the vertical diametral plane. Then, using stops 18, the coupling half 17 is brought into engagement with the Ioule coupling 16 and the arrow 19 turns 90 by 90. Herewith, the whole system: pulley 4 — mandrel 1 — arrow 19 — closed coupling half 17. Under the action of the moment, it arises from the weight of the counterweight 20, the system is rotated as long as the moments from the imbalance of the pulley 4 and from the weight of the counterweight 20 are in balance. On a scale of 14, graded in the appropriate units, arrow 19 indicates the approximate amount of imbalance in the pulley.

Then, the coupling 17 is opened (with the pulley being set down with a hard place) and the handle 29 inserts the brush 23 into the engraving with the toothed sector 21, moving it to the axial shoulder 28 of the axle. The knob 29 rotates the gear 23 in the direction opposite to that of the spring 25, which is clamped in the gear with one end. When unwinding, the spring 25 releases the axis 24. The rotation of the gear relative to the axis in the opposite direction is prevented by the spring, which twists tightly around the axis, connecting it with the gear. The toothed sector 21 deflects the gear 23 and violates the system ratios: pulley 4 — oravka 1 — arrow 22. Once this imbalance exceeds the moment of friction of the system in the supports 7, pulley 4 will begin to rotate, dragging law 1 with the cylindrical body 9. The magnitude which, when locking the system, shortens the arrow 22 on a scale of 15, which is scaled in units of the moment, is equal to the moment of friction in the supports of the device, and to determine the exact amount of its imbalance

deduct type of nokazani, and heel when t.merenii on a scale of 14.

The described operation of the device relates to the case when the imbalance of the pulley exceeds the amount of the frictional moment not more than three times. If the imbalance is commensurate with the moment of friction or less, proceed as follows. Half coupling 17 is disabled. Circle

pulley 4 is divided into four equal parts (to improve the accuracy of measuring divisions, it may be more: 6, 8, or 12). By setting pulley 4 so that the first mark is on the horizontal diametral axis,

the gear 23 is engaged with the toothed sector 21 and is slow to turn it until the pulley starts to turn under the action of the imbalance. The indication of the arrow 22 on the scale 15 is recorded at the time of the strap.

Then turn off the rotation mechanism by moving the gear 23 along the axis 24 until the stop is in the pinion with a gear 10. At the same time, the retainer ball 26 drops in

in the recess 27 of the gear, preventing the possibility of spontaneous axial movement of the gear. By rotating the pulley 90, the second mark is aligned with the horizontal. Again, insert the gear into gear with the gear

sector 21, repeat the operation of its rotation until the moment of moving the system and record a new reading.

Similarly, the values of the moment of friction are measured in the two remaining pulley positions. The recorded readings compare and determine the unbalance as the half-difference of the largest and smallest values. At the same time, the position of the imbalance corresponds to the diametrical axis passing through

mark, which recorded the greatest deviation of the arrow.

The device is simple, compact and has the full range of measuring tools necessary for accurate measurement.

static imbalances. The device is applicable for a wide range of products weighing from 25 kg to 3 tons.

Claims (1)

Invention Formula A device for determining the unbalance amount of products in the form of rotating bodies during static balancing, comprising a cylindrical body, a disk with a scale and an arrow located on the axis of the Cornus, a dimensional load and a load return mechanism, characterized in that, in order to improve the measurement accuracy, the measured weight is the form of the toothed sector, the disk is provided with a second scale and an arrow rigidly fixed on the toothed sector, and is installed coaxially with the latter, and the mechanism of rotation of the load is made in the form of an axis, with gears and gears placed on it zhipoy, one end of which is planted with strain