DD265113A1 - CONTINUOUS VIBRATOR WITH OPERATING OPERATIVE CONTINUOUS ERROR ADJUSTMENT - Google Patents

Abstract

The invention relates to a double-shaft or reciprocating vibrator for generating directed vibrations, which allows a continuous energizing force adjustment during operation, and is of primary importance for the known devices for compacting the soil or mixtures, mainly of fresh concrete quantities. The object is achieved in that according to Figure 3 on the opposite rotating hollow vibrator shafts 1 or in pairs several eccentric shear arms of centrally symmetrical shape are fixed in a torsionally rigid, the transmission members 2; 3; Generate 4 imbalances. By actuation of a lever 9 mounted outside of the vibrator housing, a continuous and at the same time finely variable center of gravity variation is provided while avoiding uneconomical interruptions in operation. Fig. 3

Description

For this 3 pages drawings

Field of application of the invention

The invention relates to a vibrator for generating directional vibrations, which allows a continuous energizing force adjustment also during operation, and is mainly used in devices for compacting the soil or fresh concrete quantities.

Characteristic of the known state of the art

It is required of double-shaft or counter-rotating vibrators according to TGL 28369, which occur in the usual devices for compacting the soil or fresh concrete quantities, that the size of the excitation force can be adapted to the different requirements in the simplest possible way. The necessary Variierurg the kinetic moment takes place once by an exchange of imbalance masses or on the other hand by changing the resulting imbalance radius by two concentrically mounted unbalance discs are mutually rotated and then locked again. Another - recently encountered method is the direct change of the center of gravity distance of an imbalance mass. But all of these methods are consistently associated with interference with the interior of the vibrator housing and require care and expertise from the operator. In addition, these retooling jobs, which are usually carried out under difficult conditions, cause downtime, which adversely affects labor productivity. From patent literature / 1; 2 / is known in the art the following:

In DD-PS 0154001 a vibrator is presented, whose unbalance consists of a moving in a conical bell rolling elements. When axial displacement of these parts due to external stress on the vibrator, there is a load-dependent centrifugal force and frequency change, but has the disadvantage that the two vibration parameters are not independently adjustable.

The amplitude oscillator according to DD-PS 30906 allows a stepless unbalance variation with mass balance to reduce the mechanical stresses. An actuation can only be done at standstill. Structurally simple variants are presented in two further invention descriptions. While the variant shown in DD-PS 70202 is associated with the disadvantage that the imbalance adjustment requires an axial displaceability of the drive shaft, in the solutions shown in DE-PS 2231271 a vertical arrangement and thus a generation of vibration in only horizontal direction be accepted. Again, a change in eccentricity vornehmbar only when machine is stopped.

-2- 285113

At this point, the DD-PS 31666 mentions whose idea of the invention has the goal of the conversion time by a constructive

shortening advantageous change in unbalance attachment, the remaining disadvantages of conventional external vibrators remain unaffected.

In the device proposed in DE-PS 2205951, the unbalance is arranged concentrically rotated Partial unbalances together, which result in addition as a result of addition or subtraction, resulting in that as Drive is provided a reversible polumschalibarer electric motor to be operated. However, an imbalance variation is only in

rough steps possible.

The device presented in DE-PS 2842937 allows an imbalance variation during operation, but only

stufenwfi ^ e. The complicated pawl adjustment mechanism used for this purpose should be susceptible to interference and subject to high wear.

Similar disadvantages has the device shown in DD-PS 229614, the characteristic of which is that a cylinder

and a piston attached thereto additional mass form the imbalance mass whose center of gravity distance changed hydraulically

A considerable design effort requires the example of a soil compaction roller in DE-PS 2633578th

described external vibrator with hydraulically or pneumatically vornehmbarer imbalance adjustment. The height

The degree of complexity should also bring with it a corresponding susceptibility to interference. The invention according to DE-PS 3238717 allows continuous unbalance adjustment during operation. The Design effort is not negligible in this case, but weighs another disadvantage heavier. The ongoing Sliding friction between the imbalance masses and a limiting ring should cause great problems, especially in Considering the high rotational frequencies, which are usually to be realized when shaking.

1 Strümpfel, H .: Development and construction of small-scale vibration equipment / patent research, high-tech (for architecture and construction Woirnar, section Baustorfverfahrenstechnik.-Weimar, 1984. - 6 p. (Unpublished).

2 Patent information of the Bauakademie der DDR / Bauinformation. Research - standing order D 32/84.

Object of the invention

The aim of the invention is to continuously adapt the excitation force of conventional double-shaft or counter-rotating exciter, as they occur in the known devices for compacting the soil or mixtures, the current requirements in a structurally advantageous manner, with a control without uneconomical interruptions occurs. The device has a simple structure and allows economical construction methods. Through their application, product quality and labor productivity are increased and simultaneously reduced downtime and reject rates, which is especially the case when the compression of fresh concrete quantities, for example, a production process is realized in which the beginning and end of the power strokes by the input or Shutdown the unbalance has been determined without interrupting the running of the vibrator.

Explanation of the essence of the invention

The invention has for its object to make a change and / or a regulation of the kinetic moment and thus the ₍ excitation force of conventional zwtingssynchronisierten double-shaft or counter-rotating vibrators continuously and at the same time - ί sensitive even during machine operation.

According to the invention, the object is achieved daduch that are arranged on the two dual-mounted hollow shafts of a counter rotating vibrator eccentric shear arms with centrally symmetric structure drehstarr that are generated depending on the current gear position variable and thereby always directed centrifugal forces. To achieve symmetrical loading conditions with respect to the main vibrator axes, the position of the gear members is changed by a translational movement of the two push members in opposite directions. This purpose is served by a lever to be operated from the outside, which is connected via two binary links and two cylinder liners with pusher links and with this help a lock in each intermediate position to accomplish. With a suitable dimensioning of the coupling gear members arranged in the above-mentioned manner, each kinetic moment can thus be realized steplessly from virtually zero up to a procedurally required or structurally determined maximum value, namely by gear positions which ensure favorable transmission angles and properties. Compared with conventional reciprocating vibrators, there is a further advantage, which is by no means insignificant, of being able to recognize the currently set magnitude of the imbalance and thus of the excitation force that has just been generated, from the outside.

Based on these advantages, production processes can be realized with the aid of the invention, in which the beginning and the end of the power strokes are determined by the extension or retraction of the unbalance, without the running of the vibrator being interrupted. In addition to favorable effects on the machine technology resulting in shorter cycle times, which are primarily for pavers for the production of small-scale elements meaning. Furthermore, the course of differentiated vibration regimes without interrupting the Vibratorlauf it is possible. Other Ausgostaltungsvarlanten are that instead of the aforementioned four-member Schubschwingenmechanismen multi-link coupling gears are used as Schubgüeder or rods designed drive links.

embodiment The invention will be explained below by way of example. In the accompanying drawings show 1: a conventional vibration table of the simplest type, FIG. 2 shows a counter-vibrator with maximum excitation force, shown in section A-A according to FIG. 1, FIG. 3 shows a mating pathogen shown in section A-A of FIG. 1 with minimal excitation force, 4 shows a section B-B according to Figure 5 illustrated arrangement of a coupling 4 on a hollow vibrator shaft. 1

and FIG. 6: a constructive view of the push-swing mechanism together with mounting and drive as a detail X according to FIG. Second

1-3, the construction of a OoppelweMenvibrators with its counter-rotating vibrator shafts 1 can be seen on which each of a mounting bushing 2, a rocker 3, a coupling 4 and a chubstange 5 5 existing parts of an eccentric thrust rocker are mounted torsionally rigid. Structure and arrangement of the mechanisms ensure that in both transmissions with opposing push rod movement always equal centrifugal forces arise that produce directed vibrations during the orbit. The change in the imbalance takes place with the aid of a mounted on the vibrator housing and externally operated lever 9, which communicates with the drive members of the two coupling mechanism push rod 5 via two binary links 8 and two displaceably mounted in guide tubes 6 cylinder liners 7 (Fig.4 and 5). The moving in the opposite direction at the same speed push rods 5 cause in both mechanisms coincident center of gravity shifts in the gear members 2 and 4 in a continuous and zug'eich sensitive manner.

Claims (3)

1. Gegenlaufvibrator with vornehmbarer during operation vornehmbarer continuous excitation setting preferably in facilities for compacting the soil or mixtures, mainly fresh concrete quantities, characterized in that rotatably mounted on hollow-drilled vibrator shafts of a conventional countervilant rotatable variable imbalances in the form of two or more pairs of parallel controlled centrally symmetric coupling mechanism and that the thrust members formed as thrust members are connected to a hingedly mounted outside of the vibrator housing lever which provides when actuated for a centrally symmetric change in the Koppelgetriebestellungen and thus for a bearing points of the vibrator waves symmetric variation of the center of gravity distances with respect to the Gegenlaufvibrator axis of symmetry. 2. Gegenlaufvibrator according to item 1, characterized in that on the vibrator shafts (1) two rotatably mounted in each case from a mounting ring (?), A rocker (3), a coupling (4) and a push rod (5) existing eccentric push rockers in Zentraltyrnmetrischer arrangement and shape are located and that the two displaceable in opposite directions push rods (5) with a hinged outside the vibrator housing lever (9) via a respective binary element (8) and one of a guide tube (7) surrounded cylinder liner (6) are connected , 3. counter-rotating vibrator according to item 1 and 2, characterized in that there are two or in pairs more parallel controlled centrally symmetrically shaped coupling gear on the vibrator shafts.