RU2393488C1 - Acceleration device for generating standard accelerations when testing and calibrating accelerometres - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: acceleration mechanism consists of a drive shaft vertically mounted on a frame through bearing assemblies, on which a location bushing is rigidly fitted, where the said bushing has to or more dual lugs uniformly distributed on a circle having radial grooves, and a pusher fitted with possibility of longitudinal displacement, whose housing is fitted with guides the number of which is equal to the number of the dual lugs of the location bushing. Each guide is connected to the dual lug by an axle passing through the radial groove of the dual lug and a curvilinear guide. Loads whose masses are calculated from the required acceleration value are attached to the end of the axle. On the housing of the pusher on the bearing assemblies there is a reducing bushing on whose outer lateral surface of which slide-blocks are attached diametrically to each other.

EFFECT: longer service life of the device, avoiding wave processes and obtaining the required law of variation of acceleration.

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Description

The invention relates to the field of measuring acceleration or acceleration pulses in the presence of a direction of movement. It can be used for calibration and calibration of instruments and devices, such as accelerometers.

A device is known (Pellinets BC, EA Barkov. A device for calibrating shock accelerometers. - SU 257170, IPC G01P 21/00. - Publish. 11.11.1969. - Bull. No. 35), which contains a shock pathogen acting on a cylindrical the rod in contact with the measuring rod and bearing the test and control accelerometers fixed at its end. The disadvantage of this device is its fragility, since it uses a shock mechanism, in addition, it does not provide the possibility of obtaining the necessary law of change in acceleration.

A device is also known (Evgrafov V.N., Rykov A.A., Rodionov A.I., Khon V.F. Device for calibrating shock accelerometers. - SU 607148, IPC G01P 21/00. - Publish. 05.15.1978. - Bull. No. 18), which contains a shock exciter acting on the cylindrical measuring rod in contact with the measuring rod and carrying the test and control accelerometers fixed at its end. The disadvantage of this device is also the fragility, since the shock mechanism is used, in addition, it does not provide the possibility of obtaining the necessary law of change in acceleration.

Closest to the proposed invention in technical essence is a device for testing products for impact (Alabuzhev P.M., Evgrafov V.N., Rykov A.A., Titorenko V.P. Device for testing products for impact. - SU 657358, IPC G01P 21/00. - Publish. 04.15.1979. - Bull. No. 14) containing a measuring rod, shock exciter and an additional rod, one end of which is connected to the end of the measuring rod, and the test object and the control accelerometer are fixed on the other .

The disadvantage of this device is that upon impact, a number of wave processes occur that significantly distort the shock process, lead to a difference in the accelerations of the test and control accelerometers, the device is also short-lived, it is impossible to obtain the necessary law of change of acceleration on it.

The aim of the invention is to increase the service life of the device, the exclusion of wave processes and obtaining the necessary law of change in acceleration.

This goal is achieved by the fact that the impact mechanism is excluded.

The essence of the invention lies in the fact that the accelerating mechanism consists of a drive shaft vertically mounted on the frame by means of bearing bearings, on which the base sleeve is rigidly fixed, having two or more twin eyes with radial grooves made in them, a pusher mounted with the possibility of longitudinal movement, the case of which is equipped with guides, the number of which is equal to the number of double eyes of the base sleeve, with curved grooves made in them, conf which are calculated according to the required law of change in acceleration, with each guide connected to a double eye by an axis passing through the radial groove of the double eye and a curved groove of the guide, and weights are fixed at the ends of the axis, the mass of which is calculated according to the required value of acceleration, and on the pusher body adapter bushings are mounted on the bearings, to the outer lateral surface of which sliders are mounted diametrically to each other, moving in a straight line vertically fixed on the frame of linear guides, a plate is attached to the upper end of the adapter sleeve for installing the calibrated and control accelerometers, with which the trigger interacts attached to one of the linear guides, and the calibrated and control accelerometers are connected to the recording device by communication lines.

Figure 1, 2, 3, 4 presents a diagram of a booster device for creating normalized accelerations during calibration and calibration of accelerometers.

Figure 1 presents a General view of the proposed device, including the engine 1, the support frame 2, the acceleration mechanism 3, the bearing support 4, the base sleeve 6, the adapter sleeve 12, the linear guides 13, plate 14, verified accelerometer 15, control accelerometer 16, trigger mechanism 17, communication lines 18 and recording device 19, sliders 22. FIG. 2 shows a section A-A, including an additional drive shaft 5, twin eyes 7 with radial grooves 20, a pusher 8 and guides 9 with curved grooves 20. In FIG. .3 presented by ix B-B, further comprising the axis 10 and the weight 11. Figure 4 is a perspective view of accelerating mechanism. In addition to these elements, the proposed device includes a thyristor frequency converter (not shown in Fig.), Designed to establish the speed of the drive shaft 5.

The engine 1 is mounted on a support frame 2, the acceleration mechanism 3 consists of a drive shaft 5 vertically mounted on the frame, on which the base sleeve 6 is rigidly fixed, having two or more twin eyes 7. The drive shaft 5 can also be moved longitudinally the pusher 8 is located, the casing of which is provided with guides 9. The number of guides 9 is equal to the number of double eyes 7. In the guides 9, curved grooves 20 are made, having a configuration calculated according to the required law and change acceleration. In the radial groove 21 of the double eyes 7 and the curved groove 20 of the corresponding guide 9, an axis 10 is placed, at the ends of which weights 11 are fixed, having masses calculated according to the required acceleration value. A adapter sleeve 12 is mounted on the pusher body 8 using bearing bearings 4. Sliders 22 are included diametrically to each other on the outer side surface of the adapter sleeve 12, which are included in the straight guides 13 vertically fixed on the frame. A plate 14 is mounted on the upper end of the adapter sleeve 12 for mounting 15 and fixing the control 16 accelerometers. A trigger 17 is connected to the plate 14. The control accelerometer 16 and the verified accelerometer 15 are connected to the recording device 19 by communication lines 18.

The proposed device operates as follows.

The engine 1 is turned off, the drive shaft 5 does not rotate, the pusher 8, the adapter sleeve 12 and the plate 14 are in the lowest position, the radius of the load 11 relative to the axis of the drive shaft 5 is minimal. The test and control accelerometers intended for testing are fixed on the plane of the plate 14.

Turn on the engine 1 and using a thyristor frequency converter (not shown in Fig.) Set the speed of the drive shaft 5 necessary to obtain a given acceleration. The trigger 17 holds the plate 14 in its original position, so the loads 11 do not move along the radial grooves 21 of the eyes 7. Using the trigger 17 release the plate 14. The centrifugal forces acting on the loads 11 are transmitted to the walls of the radial 21 and curved 20 grooves, as a result of which the pusher 8, the adapter sleeve 12 and plate 14 move along the drive shaft 5 with acceleration, the value of which varies depending on the curvature of the curved groove 20. The adapter sleeve 12 and plate 14 with accelerometers move good.

As the goods 11 move, the radius of their location relative to the drive shaft 5 changes from minimum to maximum, the acceleration of the plate 14 first increases from zero to a given maximum value, and then decreases again to zero. When cargo 11 reaches the maximum radius, the acceleration of the plate 14 is zero, but the speed of the plate 14 is greatest. Since the translationally moving parts of the device have kinetic energy, their upward movement along the drive shaft 5 continues, but the curved grooves 20 have such a configuration that the weights 11 begin to move along the radial grooves 21 back to the axis of the drive shaft 5. Centrifugal forces that were previously driving, become resistance forces. The acceleration of the plate 14 changes its sign, that is, it turns into a slowdown, the speed of the plate 14 drops to zero. The test cycle, consisting of acceleration and stopping of the tested accelerometer, is completed.

The engine 1 is turned off, the angular speed of the drive shaft 5 drops, under the influence of its own weight, the pusher 8, the adapter sleeve 12 and the plate 14 with accelerometers are lowered to the lowest position, and the loads 11 moved by curved grooves 20 are returned to the minimum radius. The recording device 19 receives the acceleration values from the accelerometers 15 and 16. The device is ready for the next test.

Thus, when creating accelerations for checking and calibrating accelerometers, the proposed device uses not an impact but an acceleration mechanism, which reduces the impact on the device, thereby increasing its service life. The exclusion of the formation of the wave process from impact increases the accuracy of measurements, and the relationship between the configuration of the curved grooves and the law of change of acceleration allows you to obtain the law of change of acceleration by changing the configuration of the curved grooves.

Claims (1)

An acceleration device for creating normalized accelerations during calibration and calibration of accelerometers, comprising a support frame, an engine, an acceleration mechanism and a control accelerometer connected by a communication line to an external recording device, characterized in that the acceleration mechanism consists of a drive shaft vertically mounted on the frame through bearing bearings, on which the base sleeve is rigidly fixed, having two or more twin eyes evenly distributed around the circumference with radial eyes made in them and grooves, a pusher mounted with the possibility of longitudinal movement, the body of which is equipped with guides, the number of which is equal to the number of double eyes of the base sleeve, with curved grooves made in them, the configuration of which is calculated according to the required law of change in acceleration, with each guide connected to a double eye axis passing through the radial groove of the double eye and the curved groove of the guide, and at the ends of the axis, weights are fixed, the mass of which is calculated according to the required value of acceleration, p In addition, on the housing of the pusher, on the bearings, a adapter sleeve is mounted, on the outer side surface of which sliders are mounted diametrically to each other; one of the straight guides the trigger mechanism, and the verified and control accelerometers are connected by a communication line to the register device.

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