DE1938082U - LOCKABLE OUTLET FOR VIBRATING CONVEYORS. - Google Patents

Description

. P.A.1619 * to * 25.3.B6

FRIEDRICH UHDE GMBH, DORTMUND

Lockable outlet for vibratory conveyor

It is known, vibratory conveyor for the purpose of feeding bunker columns in addition to the final delivery with one or more to provide closable outlets distributed over the conveying length, through which the conveyed goods can optionally advertise. It is common to use these spouts both manually and via pneumatic or to operate electrical actuators. Because the resonant Parts of the spout are exposed to correspondingly high accelerations, it is necessary to keep the parts in both the open as well as in the closed position positively to hold * so that the contact pressure is greater than that from the accelerations resulting mass forces.

The contact pressure can be generated in that the actuator remains in engagement after actuation. However, this has the disadvantage contrary to the fact that then the actuator must be moved by the vibratory drive, which causes a decrease in performance and the Actuator (gear motor, pneumatic cylinder) for rapid wear the bearing and sliding points leads. It is therefore common to arrange the actuator in a fixed position (not oscillating) in such a way that that it is only engaged with the vibrating channel during actuation. The stroke of the actuator is something in this case greater than the travel of the outlet actuation, so that in both end positions a certain safety distance caused by the oscillation amplitude there is lead between fixed and resonating parts. It is then necessary, however, that the contact pressure the outlet parts in the two end positions is generated in a different way, for example by pretensioned springs.

Constructions are now known (e.g. DAS 1 18t 277) in which the outlet is made through a closable bottom opening in the gutter trough. (Fig. 1) - The conveyor base (1) is cut out over a certain length determined by the conveying capacity and grain size and the cutout is closed by a flap swiveled in from below.

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FRIEDRICH UHDE GMBH, DORTMUND

If material accumulations are to be avoided, the flap must be flush with the floor be »i.e. the locking plate (2) must be flush with the top edge of the floor. With regard to manufacturing, there is a gap (s) necessary between the flap and the opening, which is to be sealed by placing a circumferential cover under the sealing plate that covers the gap Sheet metal strip (3) is welded.

The tightness of such a bottom flap is very limited; finer Experience has shown that dust trickles through the gap (s) onto the cover plate. If one takes into account that the gutter trough is usually made from folded, ribbed and welded metal sheets and that its width can be up to 1200 ram and that it must also be troughed for certain bulk goods, it is understandable that the due to the gap remaining on the underside of the bottom cover plate, it cannot be so tight that the dust does not but the vibration supports it when it reaches the outlet. As a remedy an attempt was made to avoid a gap between the sealing strip (3) and the underside of the floor by using elastic intermediate layers (e.g. rubber). The disadvantage here, however, is that the sealing material is functionally elastic, which means that it vibrates at high acceleration values the pressed flap occurs, which can only be prevented by significantly higher contact pressure. It also turned out that that the functionally necessary sudden stress when the flap is asleep quickly destroys the seal.

Further, in this construction, the pivot point or the actuating shaft Fig must ⁽¹ O of the flap are located beneath the conveyor bottom and outside of the opening portion, since all points of the flap free to move only in this position during pivoting.. (1) shows that in this case the inertia force P, which is to be assumed at the center of mass M of the flap in the direction of oscillation - i.e. inclined by the throwing angle towards the floor, to the pivot point has the lever arm H. A pulsating torque is created, which is greater, the greater the weight of the flap and the larger the bottom opening, which causes the lever arm H, can be selected.

- 3 - / FRIEDRICH UHDE GMBH, DORTMUND

A pretensioned spring (5) is now used to generate the contact pressure in both end positions of the flap, which is arranged in this way is that they each generate a counter-rotating torque, a comparison of the lever arms of the spring and inertial force shows that the The pretensioning force of the spring must be a multiple of the inertia force. Any increase in the lever arm of the spring is not possible, because if the lever is too large, the spring would experience such a large additional compression when actuated that a sufficient preload force in the end positions would practically lead to unsustainable spring dimensions.

The counter-rotating moment of the spring force must also be the moment balance the vibrated conveyed material pressing on the flap and its acceleration forces, which again necessitates a further increase in the pre-tensioning force.

Is now operated by the actuator dei flap and thereby over If the point of the highest spring preload is pressed, the amount of the torque, which increases rapidly as the rotation progresses, becomes the spring executed the rest of the way without engagement of the actuator as a strongly accelerated rotary movement and the flap finally hit the sealing surface with one blow. It is obvious that frequent actuation damages the seal and becomes ineffective and the parts of the torque transmission (shaft, lever, etc.) are at risk.

It is now the object of the invention to create a closable outlet on vibratory conveyor devices which has the disadvantages of the known Avoiding devices.

For this purpose, it is suggested to remove the conveyor trough in the area of the outlet assemble three separate, upwardly open part troughs, with the middle part trough, which is swiveled out to open, arranged in this way is that it encloses the sub-trough in front of it from the outside in the conveying direction, while in the following sub-trough from the inside is inserted * When the outlet is closed, that of the vibratory conveyor is used underlying micro-throw conveyor principle for sealing - used in which a floor vibrated at an angle to the conveying level

FRIEDRICH UHDE GMBH, DORTMUND

lying grain approximately one composed of micro-litters Performs a smooth, flowing movement. The gaps on the bearing surfaces that are also necessarily present in this construction (x) are arranged in such a way that dust that has penetrated is returned to the conveyor trough by the vibrating movement of the conveyor trough is returned. The arrangement of the pivotable part trough that in the area of the system the part trough in front of the sheet thickness is narrower, the one behind it be further

The main advantage of the embodiment according to the invention the possibility »pivot point and center of mass of the flap coincide to let, whereby the inertia forces of the flap cause a theoretically vanishing, practically very small torque, the spring necessary for locking in both end positions can therefore be dimensioned very soft and accordingly the force required to operate the flap and all of the above, with the impact stress when the flap hits the Sealing surfaces related difficulties eliminated or reduced to a minimum.

Fig. 2 shows an embodiment according to the invention. The continuous Conveyor trough (1) is welded to the first »conically tapering part trough (2). The latter is released from the likewise conically tapering central, pivotable part trough (3) enclosed, which in turn continues on the discharge side of the conveyor trough (4) protrudes. The pivot point (D) coincides at least approximately with the center of mass of the pivotable part trough together. When turned by about 9o degrees, the outlet opening is released. With regard to the passage of the vibration forces, the part troughs in the area of the bottom opening are different from the one with the actual conveyor trough firmly welded jacket (5) enclosed. This also takes the bearings (6) for the two pivot pins (7) on * The compression spring (8), which is over the firmly seated on the pivot pin Lever (9) engages, generates a small torque in both end positions that is just large enough to move the swiveling trough into the To lock end positions. Using the lever (to), the flap can be operated manually or via "an actuator"

Claims (1)

FRIEDRICH UHDE GMBH, DORTMUND A T E IT T REQUIREMENTS Lockable outlet for vibratory conveyor, characterized in that that the vibrating conveyor trough in the area of the outlet consists of three separate, successive in the conveying direction, upwardly open troughs, of which the middle den The inlet-side part trough encloses from the outside and is inserted into the outlet-side part trough from the inside, and that it is used for open can be pivoted about an axis, which is at least approximately passes through its center of mass.