Vibrating arrangement for machinery

Abstract: Vibrating arrangement for machinery, particularly designed for vibrocompressing machines in the manufacture of concrete moulded components, comprising a vibrating table (1) driven by two vibrating centres (2, 3), each one with two shafts (4, 5) having eccentric masses with the same rotating centre so that, when rotating the shafts to the mutual position of figure 2, no vibration is present, whereas, when rotating them to the mutual position of figure 1, a vibration is caused. The change of mutual position of one shaft to the other can be performed without stopping the rotation resulting in a saving of energy and operating time and also in a reduced wear of the components.

Description: The present invention relates to a vibrating arrangement for machinery, which exhibits remarkable advantages and innovations with respect to the present arrangements used with the same or similar purpose. It is known that presently in the industry several arrangements to produce vibrations are already being used, these arrangements using devices undergoing continuous startings and stoppings to alternatively cause vibrations, but unavoidably all these startings and stoppings speed up the mechanical wear of the device while concurrently and remarkably increasing the energy expenses and extending the operating times. In FR-A-2659574 a vibrating apparatus is disclosed which comprises two vibrators fitted in line and rotating in the same direction which cause a multidirectional vibration perpendicularly to the axis of the vibrators. Each vibrator comprises two coaxial shafts carrying eccentric masses which may be adjusted in their mutual angular position by an adjustment of two coaxial shafts driven by a motor and able to rotatively slide in their mutual relationship. To avoid all these drawbacks, the vibrating arrangement for machinery, which is the object of the present invention, has been devised and particularly designed to be used in the vibrocompressing machines in the manufacture of concrete moulded components. The vibrating arrangement proposed according to the invention consists in a vibrating unit provided with the features as indicated in claim 1. Here the vibrating table is driven by two vibrating centers made up of rotating shafts around which concentric masses with identical rotation centers are provided, these two vibrating centers being arranged in a parallel relationship, and promoted by a motion drive kinematic chain, capable of ensuring two rotating systems, one of which setting up a rotation while the other not, without stopping the rotation and thus without startings and brakings with the subsequent energy saving and operating time saving and also the least wear in the components. Other embodiments of the present invention result from the subclaims. A more detailed description of the present invention is now given with reference to the annexed figures, wherein a preferred way of embodiment has been illustrated only by way of a non-exhaustive example. Figure 1 shows a side view of a vibrating unit according to the invention and a detail of the vibrating centers 2 and 3 at a position where vibration is caused. Figure 2 is a view similar to the previous figure but in a position where no vibration is caused, i.e. with operation of cylinders 16 and 17, free pulleys 18 and 19 are moved and eccentric-mass shafts 4 and 5 are duly balanced. Figure 3 is a cross-section view along lines A-A' of the preceding figure 2. Figure 4 shows the other side view of the unit as illustrated in figure 3 wherein the drive is fixed (pulleys 9 and 13). Returning to the figures, it can be seen in the embodiment therein that a vibrating arrangement for machinery of the type according to the invention comprises a rotating table 1 driven by two vibrating centers 2 and 3, arranged in a parallel relationship and rotating in opposite directions, each one being provided with two shafts 4 and 5 having eccentric masses with the same rotating center so that when rotating, as shown in figure 2, no vibration is caused while instead when rotating, as shown in figure 1, a vibration is caused. It is now emphasized that when a double toothed belt 14 and 15, as illustrated on Fig. 1 to 3, is fitted, said opposite rotation of the two vibrating centers 2 and 3 is originated and consequently likewise an overall one-direction vibration of the vibrating table 1, i.e. downwardly and viceversa on the plane made with both main vibrating centers 2 and 3. This vibrating arrangement using the device detailed hereinafter causes a vibration or not (according to positions as in figure 1 or figure 2), all this without stopping rotation, and consequently energy (startings and brakings) is saved, also with the least mechanical wear and many other advantages that are not necessary to be detailed here. The operation of the system is driven from a motor 6 such as designated in figure 3 and is started by rotating the interlocked shaft 7 together with two toothed pulleys 8 and 9. The independent shafts 10 and 11 are driven by two belt-driving pulleys. These shafts 10 and 11 drive the four shafts with eccentric masses 4 and 5 through their toothed pulleys 12 and 13 and the double toothed belts 14 and 15, the motor driving power being equally shared by the four eccentric mass vibrating shafts and the vibration is caused whenever the shfats are located in the position of figure 1 while no vibration is caused in the position of figure 2. The step from the position of figure 1 to that of figure 2 is performed by means of the device of figure 1 and figure 2, comprising two cylinders 16 and 17 (hydraulic or pneumatic) which are shifting the pulleys 18 and 19 from the position of figure 1 to the position of figure 2, i.e. from left to right-hand and vice versa. Specifically, when the fixed shaft 7 rotates, the two vibrating shafts (5) driven by the fixed belt driving unit (pulleys 9 and 13 on figure 4 and belt 14 on figure 3) remain fixed, while otherwise the other two vibrating shafts (4) (figures 1-2) may rotate by 180° which is the same the pulley 12 rotates, with the consequence that the belt 27 in the position of figure 1, when going to the position of figure 2, reduces its length in the side of the pulley 18 and increases its length in the side of the pulley 19, while causing the 180° rotation of the pulley 12 and shaft 10 (all that happening with all devices when rotating). Shifting of cylinders 16 and 17 can be varied with the consequence that the positions of the eccentric masses 4 and 5 are also made variable, so that a stronger or weaker vibrating power can thus be achieved. Another variant to be emphasized would be that causing the operation of the device of figures 1 and 2 with only one cylinder or mechanical pusher, and also the compensation of pulleys 18 and 19 in their shifting motions with springs, electrometers, hydraulic or pneumatic cylinders or gravity counterweights. In the position 24, antivibrating supports of the vibrating table 1 are shown on columns or bases 25 to which the vibration is not wanted. Lastly, in the position 26, a pulley operating as an idler pulley is shown.

Claims: A vibrating unit for machinery, comprising a frame (25), a vibrating table (1) supported on the frame, first and second vibrating centers (2, 3), each vibrating center including first (4) and second (5) coaxial rotatable shafts which carry respectively first and second eccentric masses, said first and second eccentric masses of each vibrating center being positioned so as to be balanced and induce no rotational vibration when the masses are disposed in a first position wherein they are substantially in opposed angular position, said masses when relatively moved into a second position wherein they are both disposed in the same angular position being such as to create an unbalanced force when the respective vibrating center is rotated, a driving unit comprising a motor (6) rotating, by means of first and second drive belt means (8-15, 18-19 and 27), said first and second vibration center, and position adjusting means (16-17) for effecting during the rotation of the shafts an angular adjustment in the positions of said first shafts (4) relative to said second shafts (5), enabling an angular adjustment of the eccentric masses on said first shafts relative to said second shafts, characterized in that said first and second vibrating centers (2, 3) are mounted on said table side-by-side in a parallel relationship, the driving unit rotates said first and second vibration centers in opposite rotational directions, said first drive belt means (8, 12, 15, 18, 19, 27) is drivingly engaged with the first shafts (4) of each of said first and second vibrating centers (2, 3) for effecting a simultaneous and synchronous rotation of said first shafts (4) in an opposite rotational direction relative to the other of said first shafts (4), said second drive belt means (9, 11, 13, 14) is drivingly engaged with each of the second shafts (5) of said first and second vibrating centers for causing simultaneous and synchronous rotation of each of said second shafts in an opposite direction relative to the other of said second shafts, whereby the vibrating unit imposes a vertical vibratory force to the table when said masses are moved in said second position, and in that the position adjusting means (16-17) are able to cooperate with said first drive belt means (18, 19, 27) in rotation for effecting said angular adjustment. A vibrating unit according to claim 1, wherein said position adjusting means (16-17) comprise hydraulic or pneumatic cylinders (16, 17) which cooperate with pulleys (18, 19) of said first drive belt means (18, 19, 27) for shifting them transversely relative to their respective belt (27), enabling said angular adjustment of the eccentric masses on said first shafts (4) relative to said second shafts (5). A vibrating unit according to claim 1, wherein said position adjusting means comprise one hydraulic or pneumatic cylinder or mechanical pusher which cooperates with pulleys (18, 19) of said first drive belt means (18, 19, 27) for shifting them transversely to their respective belt (27), enabling said angular adjustment of the eccentric masses on said first shafts (4) relative to said second shafts (5), and compensation means for said shifting such as springs, electrometers or gravity counterweights, cooperating with said pulleys (18, 19). A vibrating unit according to anyone of claims 1 to 3, wherein the table (1) is supported on the frame (25) by antivibrating supports (24).

Inventors: POYATOS DIAZ ANTONIO, POYATOS DIAZ, ANTONIO
Applicants: POYATOS DIAZ ANTONIO, POYATOS DIAZ, ANTONIO
Application year: 1993
Main classification: B06B1
IPC codes: B06B1, B28B1