DE2124759A1 - Rotary vibrator - Google Patents

Description

DK-3230 Grasted / Dänemärk

Rotary vibrator.

In conventional rotary vibrators, the vibrators are usually provided with an eccentrically arranged mass cream creates heaving wave. I> he centrifugal force results here rotational oscillations or vibrations, which via the shaft bearings to other solid bodies or other objects can be transmitted that are to be vibrated. A known vibrator of this type, in particular is used to make molding boxes or formwork walls when pouring concrete To make it vibrate, has a motor with a continuous shaft, which has a rotating mass on each volume wearing. In general, squirrel cage motors are used,

10S849 / 12II

Andi «iewski _r Honke & Gesthuysen, patent attorneys, 4300 Essen, Theaterplatz

those with a speed close to one of the synchronous speeds run and therefore generate a fixed frequency of vibration, but will often change the vibration generated the rotating masses arranged in such a way that a gradual adjustment of their eccentricity in the simplest way is achievable. As a result, the user can enjoy the performance adapt the vibrator to the work to be carried out and avoid excessive vibrations, which would cause excessive wear the molding boxes or formwork walls would cause.

Recent studies have shown that many jobs can be carried out better if a frequency of over 3000 vibrations per minute are generated with a double-pole motor operated via a 50 Hz alternating current line. In these cases, higher speeds are required, which can be achieved by using commutator motors that drive the vibrators via a gearwheel or a belt drive. However, this solution is relatively expensive and generally requires special maintenance · As a result, has this proposal not too widely accepted, especially not for ämn initially stated purpose, ie to form boxes in vibration to versetztn "In virtually all on the market vibrators is the Line frequency increased by frequency converter, whereby 1200 vibrations / min can be generated by means of a converter rotating at 200 Hz alternating current, which is completely sufficient for most purposes. The increased speed is, however, accompanied by a new difficulty which ^{falls in f} s weight, especially in the case of larger units, in which the roller bearings normally do not

1Q9 & 43/1282

2124759 Andrejewskt, Honk & Gesthuysen, patent attorneys, 4300 Essen, Theaterplatz

are designed for such high speeds and therefore excessive Are exposed to wear, so that even oversized bearings running in oil are replaced at short intervals must be, whereby the operation is constantly interrupted. This should be in connection with the cost of the frequency converter also be the reason why many manufacturers of concrete products are still using 50 Hz vibrators, though through The use of high-frequency vibrators results in higher strength and shorter production times, i.e. a higher output Concrete goods, would be achievable.

The object of the invention is to provide a rotary vibrator with an electric motor which can be connected to the object to be vibrated in such a way that the vibrations of the rotor are transmitted to the base plate can be transmitted via the bearings and the stator, to be designed in such a way that the motor shaft has a translatory Movement with a multiple of the engine speed corresponding frequency can be given.

For this purpose, the invention proposes essentially, at least one end of the motor shaft in a swing roller or To store ball bearings by means of which the shaft said translational movement can be granted.

Such a swing bearing for such a rotary vibrator is, for example, in U.S. Patent Application 883 respectively the Danish patent application 6047/68 and has, for example, a central part surrounded by a ring, wherein the central part has the shape of a uniform

109849/1282

Andrejewski, Honke & Gesthuysen, patent attorneys, 4300 Essen, Theaterplatz 3

Polygoms with rounded corners and slightly convex or concave Has surfaces, the shape and number of which between the central part (inner race) and the outer ring (outer race) arranged rolling bodies corresponds, so that between each rolling body and the surfaces of the opposite Bearing rings regardless of the angular position of these rings to each other a game of the order of magnitude ZERO can be achieved.

During rotation, the inner ring can perform a translatory movement, whereby its center point moves on a circle around the center point of the outer ring. The angular speed of the translatory movement is approximately equal to the angular speed of the inner ring multiplied by 2 ^ -,
where η «is the number of sides of the polygon, which in turn is 1 larger or smaller than the number of rolling bodies«

In order to increase the effect of the vibrations, the rotary vibrator can be provided with exchangeable masses, which are concentric on the protruding end pieces of the motor shaft
are arranged. In a special embodiment of the invention, the protruding ends of the motor shaft can be provided with exchangeable masses which are eccentric to the shaft
are arranged, whereby a vibration frequency is generated which corresponds to the number of revolutions per second of the shaft, so that
the vibration generated by the swing bearing or bearings are superimposed on the low frequency vibrations from the eccentric mass.

109849/1282

Andrejewski, Honke & Gesthuysen, patent attorneys, 4300 Essen, Theaterplatz 3

If the normal bearings in a motor are exchanged for two oscillating bearings, the result is that the rotor axis is in operation a translatory circular movement around the stator axis with a multiple of the speed of the motor is issued. Because the rotor axis coincides with the center of gravity axis, results in a

n + 1 vibration with a frequency equal to i ^ y- times the speed.

In such an embodiment of the invention, the motor shaft is preferably provided with an axial bore in which a through shaft is mounted, which at both ends one with the roller cage of the respective oscillating bearing in engagement standing driver carries, whereby a phase match both roller cages can be achieved. In this way, any phase shift between the two created by the two bearings Prevents vibrations.

A more detailed explanation of the invention can be found in FIG the following description of two preferred exemplary embodiments with reference to the accompanying drawing; show it:

Figure 1 shows an axial section through an inventive Rotary vibrator;

Figure 2 is an end view of this rotary vibrator with the bearing cap removed; and

Figure 3 is a longitudinal section through a second embodiment a rotary vibrator according to the invention.

109849/1282

Andrejewski, Honke & Gesthuysen, patent attorneys, 4300 Essen, Theaterplafz 3

The rotary vibrator shown in Figures 1 and 2 has a stator 1 with a rotor 2, which as in a conventional Squirrel cage motor are constructed, but provided a somewhat larger radial play at least at one end of the stator is. The rotor has a continuous shaft 3 »which is mounted on one side in a conventional bearing 4a, which allows a slight angular deviation. At the other end, the shaft is mounted in a swing bearing 4, the inner ring of which is pressed onto the shaft. This inner ring is formed by a number of balls or rollers 5 in a roller cage 6 supported, which are enclosed by a race 7, as can be seen from FIG. Parts 6 and 7 are practical formed in the same way as the corresponding parts of a conventional roller bearing.

Due to the geometric principle according to which the swing bearings are designed, all rolling elements have a game in the order of magnitude ZERO, so that the right end of the rotor can rotate freely with respect to the stator when exercising the above-described translational movement. Rotates in operation the roller cage with the rollers with almost half Angular velocity.

The embodiment shown in FIG. 3 has a stator 21, a rotor 22 and a shaft 13 ′ mounted at both ends in oscillating bearings 14, the inner ring of this oscillating bearing. is again pressed onto the shaft 13 and the race 17 is fastened in the stator 21. Even if the two roller cages tend to adjust to and in the same phase

109849/1282

Andrejewski, Honke & Gesthuysen, patent attorneys, 4300 Essen, Theaterplatz

\ 2174 7 59

To persist during operation, both bearings are slightly barrel-shaped so that the vibrator is not damaged if both bearings should have unequal phases and the vibration power should drop to ZERO.

The radius of the translatory movement is generally only a fraction of the eccentricity of the rotating masses in the vibrators described above. This partly depends on the oscillating bearings, which have a limited stroke length. must be formed, and in the present case partly from the fact that the play between the motor armature and the stator shouldn't be too big. In general it will be necessary to provide a slightly larger clearance than normal, which however only results in a slightly higher operating current for the motor.

The strong vibration effect achieved despite the relatively small radius results from the fact that the mass of the shaft with the Anchor is equal to the multiple of the rotating masses normally used. If a stronger vibration is desired appears as through-the shaft and the anchor is achievable, additional masses can be arranged on the shaft ends, thus in the same way as with the ones described above Vibrators an adjustable vibration power can be achieved. In general, these additional masses will be concentric arranged to the shaft and the vibrations generated on these catfish are pure sine waves. By eccentric However, by arranging the additional channels, it is possible to obtain a low oscillation of the fundamental frequency of the motor, which is superimposed by the fast oscillation. This can can be valuable in certain cases.

109849/1282

Andrejewski, Honke & Gesthuysen, patent attorneys, 4300 Essen, Theaterplatz

2174759

In the embodiment of Figure 1 on the right side of the shaft 3 is a mass 15 and in the embodiment according to the FIG. 3 a mass 12 is provided at both ends of the shaft 13.

With large vibrators it can sometimes be necessary to make absolutely sure that both oscillating bearings work in phase under all circumstances. This can be achieved inventiveness W in accordance with that shown in Figure 3 construction. Here, the rotor shaft has a bore 9 in which a weaker continuous shaft 10 is mounted, which carries a driver 11 at each of its free ends, which engages with the associated roller cage in order to keep it in phase. The engagement must be designed in such a way that a certain radial movement corresponding to the radius of the translational movement between the driver and the roller cage is possible. In operation, the auxiliary shaft 10 rotates at approximately half the angular speed of the rotor.

As already mentioned, the vibrators according to the invention ^ inevitably be built with a larger game than this is normally provided between the armature and the stator of the motor, and taking into account the eccentricity of the translational movement, the distance between the two parts will always be greater on one side of the armature than on the others. This disadvantage is overcome according to the invention in that motors with a flat air gap at right angles to Axis uses v / earth, which results in significantly improved operating conditions. In such an engine are

109849/1282

Andrejewski, Honke & Gesthuysen, patent attorneys, 4300 Essen, Theaterplatz

the armature and the stator arranged endwise and the normal motor play can therefore despite the eccentricity during the Operation can be kept constant.

Rotary vibrators according to the invention can thereby be simplified that instead of two oscillating bearings only one oscillating bearing is used. The other end of the shaft is then in stored in a normal bearing, which, however, must allow a certain angular movement. In this case the moves Motor axis on a conical surface around the stator axis and you can only use half the mass of the rotor as the rotating mass credit. In this case, additional masses must be arranged near the swing bearing, which as in the above Embodiments are designed concentrically or eccentrically depending on the desired vibration.

Expectations:

1 0 9 S 4 9/1 2 8 2

Claims (4)

Andrejewski, Honke & Gesthuysen, patent attorneys, 4300 Essen, Theaterplatz 3 / β 217 * 759 claims. 1) Rotary vibrator with an object to be shaken such connectable electric motor that the vibrations of the rotor to the base plate via the bearings and the stator are transferable, characterized in that at least one end of the motor shaft (3) in a swing roller or Ball bearing (4-7) is mounted and via this the shaft a translational movement with a multiple of the engine speed corresponding frequency can be granted » 2) Rotary vibrator according to claim 1, characterized in that the free ends of the motor shaft (5) are interchangeable Masses (15) can be placed concentrically to the shaft. 3) rotary vibrator according to claim 1, characterized in that that on the free ends of the motor shaft (3) exchangeable masses (15) can be placed eccentrically to the shaft. 4) Rotary vibrator according to any one of claims 1-3 with a motor shaft mounted in oscillating bearings at both ends, thereby characterized in that the motor shaft (13) has an axial bore (9) and a through shaft (10) is mounted in this, which at each end has a driver which engages with the roller cage (16) of the respective oscillating bearing (14-17) (11) carries, whereby a phase match between the two roller cages is achievable. Patent attorney. 109843/1282