DE1955772A1 - Shaking or vibration device with a number of oscillating drives - Google Patents

Description

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KABUSHIKI ICAISHA YASKAWA DENKI SEISAKUSHO, Fukuoka-Ken, Japan

Shaking or vibrating device with a number of oscillating drives

The invention relates to a shaking or vibrating device with a number of oscillating drives.

It is known to equip conveyor belts or conveyor troughs for driving with a number of magnetic vibrators. The magnetic Vibrators are usually fed by one and the same source of electrical power, so that these are magnetic Forces generated by vibrators are necessarily synchronous and in the same phase.

These known conveyors have the disadvantage that the vibrating or shaking forces are relatively small and that the capacity of the devices in comparison with such devices is limited, in which the vibration forces with the help of non-running Drives are generated that consist, for example, of an induction motor with an eccentric weight. Such drives with rotating weight are called rotating vibratory drives.

Fiüttel- or vibration devices with a number of rotating oscillating drives are not known up to now. The reason for this is that, in contrast to the electromagnetic drive, the induction motors each have a slip

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the synchronous speed and that it is therefore impossible when using these motors to determine the direction of the centrifugal forces to maintain in the correct way, i.e. the angular position of the eccentric weights in synchronism and with respect to them To keep phase position in agreement. Therefore, if you have a system with a conventional long conveyor with the help of a wanted to set the rotating vibratory drive in vibration, it has been customary to use large vibrators with vibrators To provide power in pairs and to combine these drives with a number of resonance springs or the arrangement like this to meet that one drive has a greater rigidity than the other drive, or these drives with a number to be coupled by resonance springs, so that two oscillating mass systems arise. However, these vibrating devices have different ones Disadvantages, especially because their structure is very complicated and because they are not suitable for standard designs, since the Devices must be individually adapted to the length of the conveyor. It is also not possible to change the length of the device at your option so that it can be adapted to the intended use in a factory in which the vibratory equipment is used will.

It is therefore the object of the invention to provide a shaking or vibrating device which is also suitable for the construction of long conveyor systems suitable and avoids the disadvantages of the usual vibrating devices.

This object is achieved according to the invention in that a number of distributed, opposite mass body is attached via resilient resonance members that the device 'on anti-vibration devices is carried by a stationary component, and that rotating vibratory drives each with an induction motor and a Eccentric weight provided and assigned to the mass bodies.

Embodiments of the invention are explained in more detail below in connection with the drawings.

009822 / US3 BAD OBiGlNAu

In the drawings are:

Fig. -1, 2 and 3 schematic views for explanation

the principle of invention,

Fig. 4 is a side view of an embodiment

form of the invention,

Fig. 5 is an enlarged view of a _#

Individual part of the arrangement according to FIG. 4,

FIG. 6 is a side view corresponding to FIG

Line IV-IV in Fig. 5,

7 (1), (II) » (III) and (IV) are diagrams showing the various

Represent shaving states of the device according to the invention.

Fig. 8 is a diagram showing a characteristic

of the vibrating device according to the invention and

Fig. 9,10,11,12. and Fig. 13 are schematic views of others Embodiments according to the invention.

If several rotating vibratory drives are directly connected to a vibrating body, different stable vibration states result depending on the various properties of the drive, such as the rigidity, the weight and the natural frequency of the vibrating body, the properties of the supporting springs, the vibrating forces that are fed to the vibrating body etc. To simplify the description, a case is considered with reference to FIGS. 1 to 3 in which two oscillating drives A) and B) are provided.

(1) If, as shown in Fig. 1, the weight of a vibrating body C is very large in relation to the driving force supplied to the vibrating body C, and the rigidity of the body C is very large, the two vibratory drives A ■ ^{] work:} 009822/1463 "

and B synchronous to each other regardless of the direction of rotation, each drive working and rotating independently of the other drive.

(2) When, as shown in Fig. 2, the vibrating body C has a small mass and is very rigid and the vibrating frequency of the vibratory drive is greater than the natural frequency of the entire system, a synchronizing force acts as a result the oscillation up and down if the direction of rotation of the vibratory drives A and B is opposite and the speeds of the Machines are synchronous, but the rotational phases of the machines are only the same in the vertical direction and in the right and left directions differ from each other by 180 °, i.e. that in the horizontal direction of the drives applied forces cancel each other out, while only vertical vibrations in the vibrating body C are generated.

(3) If in the above-described case (2) the oscillation frequencies ^ of the vibratory drive is significantly smaller than the natural frequency of the entire system, the synchronizing force becomes effective due to the oscillation in the horizontal direction to the right and left, if the drives A and B are synchronous and the phase position of the drives A and B is the same in the horizontal direction according to FIG. 3, but in the vertical direction Direction differs by 180 °, so that only horizontal vibration is generated in the body C.

(4) If in the above-described case (2) the vibratory drives A and B rotate in the same direction of rotation, a pendulum oscillation occurs generated whose center coincides with the center of gravity of the prime mover in general, so that the prime mover A and B rotate synchronously with a phase difference of 180 °.

(5) In the above described case (2) the oscillating drives A and B can -v .rht synchronously and driven with the same phase (in accordance with the invention, the oscillating drives A and B are synchronously driven at the same ^phase; as shown below). '009822/1453

BATH ORIGINAL

Reasons why it is possible to use a drive according to paragraph (4) and it is impossible to achieve a drive according to paragraph (5), result from the following consideration:

In the case of paragraph (4) there is a pendulum oscillation, the intensity of which corresponds to the value 2RF / I, where R is half Distance between the oscillating drives A and B, F the oscillating force of the Sßhwingantriebe and I the moment of inertia of the Mean oscillating mass. In the case of paragraph (5), a circular oscillation occurs, and the intensity corresponds to the oscillation the value 2F / W, where F as above denotes the driving force and W is the weight of the oscillating mass. if It is now assumed that in the above two cases (4) and (5) the weights of the vibrating mass and the vibrating forces the vibratory drives A and B are the same size, the relationship 2RF / I = 2F / W results. Accordingly, in the case of paragraph (5) the vibration intensity is greater and a greater vibration force is required than in the case of paragraph (4).

In the above-described cases (2) and (3), the vibrating state is stable ,, when the vibration energy is a minimum, so that the vibration is not stable in the case (5), but in case (4) is stable.

According to the invention, the oscillating device is constructed so that the energy of the pendulum oscillation can be greater than the energy of the circular oscillation. "In the case of FIG It is now assumed that the oscillating drives A and B rotate in the same direction at a speed which is close to the natural frequency of the oscillating system generated by the drives A and B, the oscillating body C and the resonance springs D and E. In this case, the drives A and B work synchronously and stably when their phases of rotation differ by 180 °, with! compression, tension and bending moments on the

0 0 9822/1461

Vibrating body C are exerted, so that the required energy is relatively large. However, if drives Λ and B work synchronously and stably with the same phase position, the above-mentioned excessive loads cannot arise, so that the energy for the vibratory drive of the system is a minimum. The construction of Fig. 3 becomes a continuation stable operation is only ensured if the drive systems A and B work synchronously with the same phase position.

The invention will now be explained in connection with the exemplary embodiments.

According to Figures 4, 5 and 6, the oscillating system contains an oscillating body, e.g. a vibrating gutter composed of several gutter sections each of a predetermined length with the channel sections firmly connected to one another. The system also includes a number of opposing ones Mass bodies 3, which are each connected via a rubber resonance spring 4 to the relevant section of the channel. The arrangement also contains vibratory drives 5, which are each connected to an associated mass body 3 and leaf springs 6, which regulate the direction of oscillation of the oscillating body, the springs acting so that they cause an oscillation of the channel 1 and the Cause mass body 3 in a direction perpendicular to the plane of the leaf spring, and finally a number of anti-vibration devices in the form of springs 7 »which support the entire device against a stationary component, e.g. the floor. the Vibratory drives 5 consist of an induction motor and an eccentric weight which is attached to one end of the shaft of the motor is so that a circular vibration generating force is generated when the motor is driven by an electric. Power source is driven.

The oscillating system of FIGS. 4, 5 and 6 has four degrees of freedom, the channel 1 and the opposite bodies being connected to the oscillating drives 5 via the resonance springs 4

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are. Since the parts of the system have their own natural oscillation frequencies, the oscillation of the system is determined by these frequencies if the oscillating drives are operated synchronously and with the same phase position or synchronously and with a different phase position (approx. 120 °). It is now assumed that the spring constant of the resonance spring 4, the weights of the channel sections and the opposing mass bodies 3 and the driving forces of the vibratory drives are constant. If now the resonances examined the sequence and the synchronous states of the lowest resonant frequencies, one obtains the Yferte of Fig. 7. In the case of Fig. 7 (1), the entire tray 1 on due to the effect of the oscillation protection device in a - and outgoing 'oscillation offset. In the case of FIG. 7 (11), the channel is set into a vibration which is shown in this figure and which results from the natural frequency of the channel itself. The state of Fig; 7 (111) results from the natural oscillation frequency of the opposing mass bodies 3 (including the vibratory drives 5) » whereby the mass body 3 vibrates in the direction of the arrow (a) and the channel assumes an almost stationary state. In the state of FIG. 7 (IV), the channel 1 with the opposite mass bodies 3 is set in an oscillation determined by the natural frequency, the oscillation direction of which corresponds to the arrows (b) and (c) at an angle of around 20 ° to 30 ° ° is opposite to the conveying direction of the material on the channel.

In Fig. 8 are the different resonance states of the cases (I), (II), (III) and (IV) are shown. In carrying out the invention, it is appropriate to use states (II) and (III) of as far as possible from state (IV) in order to avoid a malfunction in the operation of the device. When the swing state (III) is in the vicinity of state (IV), when the electric drive is switched on, the device enters state (III) and normal operation cannot be achieved. Furthermore, it sometimes turns out to be necessary is, the vibration amplitude of the channel by changing the

009822 / Uta.

BATH ORIGINAL

The speed of the induction motor can be changed to control the flow rate of the material. Again, normal operation cannot be achieved when the arrangement is in the vibrating state (III) remains, so that it is necessary to make the construction so that the oscillation states (II) and (III) be shifted as far as possible towards lower frequencies.

The example shown in FIG. 9 relates to a device in which two channel sections are firmly connected to one another and the opposing mass bodies 3 are firmly attached to the respective channel sections. The mass bodies are connected to one another by resonance springs 4. The mode of operation of the embodiment according to FIG. 9 largely corresponds to that of the example according to FIG. 4, except for the fact that the mass bodies 3 vibrate together with the channel. The opposing body mass kön- be NEN ¹ constructed so that they themselves have channel shape and form a two-stage conveyor device in this way. The conveying direction is the same in the lower and upper sections.

The embodiment of FIG. 10 relates to a case in which the channel 1 and the opposite mass body 3 are continuously related to each other. The operation of the embodiment of FIG. 10 corresponds that of the embodiment according to FIG. 9, however, the problem here is that it is necessary to remove the mass body 3 and redesign the gutter depending on the length that is required;

The exemplary embodiment according to FIG. 11 relates to the case in which an upper and lower channel 1 and 11 are provided which enclose the opposing mass bodies 3, the channels and mass bodies being connected to one another via resonance springs 4 and 14. The channel 1 and the opposite mass bodies 3 are connected by leaf springs 6, which are inclined at an angle , and the channel 11 is connected to the mass bodies 3 by leaf springs 16, which have a corresponding

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have opposite inclination. Ifenn in the example " 11, the vibratory drives are switched on the channels 1 and 11 set in different inclined oscillations, wherein the opposite mass body 3 swing in the horizontal direction, so that the material through the channel after one side and the material in the channel 11 after other side is promoted. In this way, according to FIG. 11, a conveyor system can be obtained which is simple and effective Way, a promotion in both directions is permitted.

The embodiment according to FIG. 12 relates to the case in which the oscillating drive 5 is divided into an induction motor 15 and an eccentric weight 15a and these parts are connected by a belt drive. This exemplary embodiment is particularly advantageous when it comes to protecting the bearings of high-performance drives. The embodiment according to FIG. 13 relates to the case in which the induction motor 15 is stationary, for example mounted on the floor, so that more favorable maintenance of the motor is possible.

In all of the exemplary embodiments, the opposing mass bodies can be omitted if each of the vibration-generating Drives have the same mass as they are for generation. vibration is required.

According to the invention, the opposite mass bodies, which each contain the rotating oscillating drive, are along the arrangement and distributed via corresponding resonance elements, e.g. springs, with a vibrating body, e.g. a conveyor device, tied together. The drives work synchronously and with the same phase, with a very long vibrating or vibrating conveyor system arises. In addition, the performance of the device is unlimited, and a vibrating or vibrating conveyor of the desired length can be used can easily be made by connecting a number of conveyor chute sections together.

009822 / USa.

Claims (1)

Claim Vibrating or vibrating device with a number of vibrating drives, characterized in that a number of distributed opposing mass bodies (3) are attached to a vibrating body (1) in the manner of a conveyor via resilient resonance members (4), that the device is mounted on vibration protection devices (7) is supported by a stationary component _f and that rotating vibratory drives (5) with j, e an induction motor and an eccentric weight are provided and assigned to the mass bodies (3). 009822 / 14S3.