RU2450920C1 - Table vibrator for concrete mix compaction (versions) - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to construction, particularly, to devices for production of construction articles. Table vibrator comprises working member connected with lengthwise flexible bar, vibration exciter and base. Displacing vibration exciters are furnished with unbalanced masses revolving in antiphase and mounted on two flexible beams. Beams are fixed on working member bottom side. Table vibrator is provided with shock-absorbers.

EFFECT: simplified design.

4 cl, 6 dwg

Description

The vibrating platform for compaction of concrete mixtures belongs to the field of construction, in particular, to devices for the production of building products and structures.

Known vibration platform with vertically directed vibrations, containing a working body, two vibration exciters with unbalances rotating towards each other, shock absorbers and a base (A. Borschevsky, A. Ilyin, “Mechanical equipment for the production of building materials and products”: Textbook for universities specialty: “Production of building products and structures.” - M .: Higher. Shk, 1987. - p.295-296).

A disadvantage of the known device is that the exciters are rigidly connected with the working body, which worsens the possibility of high-quality tuning to a given frequency mode of operation and, accordingly, reduces the efficiency of the device.

The closest technical solution is a resonant vibration pad for compaction of concrete mixtures in the mold, containing a working body connected to the longitudinal beams, a vibration exciter, shock absorbers and a base (RU No. 2051790 “Resonant vibration pad for compaction of concrete mixtures in the mold”, Cl. B28B 1/08. 01/10/1996).

A disadvantage of the known device is the complexity of setting the vibrating platform for a given mode, especially for products of complex design, which reduces the efficiency of the device.

The objective of the invention is to simplify the design and increase its effectiveness.

The technical result of the invention is the provision of regulation of the operating mode of the vibrating platform and improving the accuracy of its settings.

The task and the specified technical result is achieved by the fact that according to the first embodiment, the vibrating platform for compaction of concrete mixtures includes a working body connected to a longitudinal elastic beam, vibration exciter, shock absorbers and a base. According to the invention, the vibration exciters are made movable, they are equipped with counterbalances rotating in antiphase and mounted on two elastic beams, while the beams are fixed on the lower side of the working body. In addition, each exciter is mounted rotatably around the longitudinal axis of the elastic beam.

According to the second variant, the vibration platform for compaction of concrete mixtures includes a working body connected to a longitudinal elastic beam, a vibration exciter, shock absorbers and a base. According to the invention, one longitudinal elastic beam is fixed on the lower side of the working body with two vibration exciters mounted movably on it, and the shaft axes with vibration exciters unbalances are directed perpendicular to the axis of the elastic beam.

According to the third option, the vibration platform for compaction of concrete mixtures includes a working body connected to a longitudinal elastic beam, a vibration exciter, shock absorbers and a base. According to the invention, one vibration exciter is mounted on the longitudinal elastic beam with the possibility of its rotation through 360 ° and rotation about its axis.

The installation of vibration exciters on the elastic beams allows you to further adjust the operating mode of the vibrating platform, through the use of their elastic properties, for example, by changing the amplitude of the vibrations, changing the distance δ between the beams. The installation of vibration exciters with the possibility of their movement along the axes of the elastic beams (two-beam scheme) by a distance of δ and, accordingly, regulation of the operating mode of the vibrating platform, allows you to quickly take into account the change in the position of the center of gravity of the system in the case of, for example, molding complex and densely reinforced products. The installation of two vibration exciters on one elastic beam (single-beam scheme) allows, firstly, to simplify the design of the vibration platform, secondly, to freely set directional vibrations, and thirdly, by adjusting the distance between the vibration exciters δ, to additionally change the vibration amplitude of the system. By adjusting the distance between the axes of rotation of the unbalance of vibration exciters by rotating vibration exciters mounted on elastic beams (two-beam scheme), relative to their axes, it is possible to more accurately adjust the vibration regime taking into account the rheological properties of the mixture and the molded product. The possibility of regulating the operating mode of the vibrating platform due to additional vibrations arising in the elastic beam is expanding. So, in the process of moving vibration exciters from the middle of the beam to its extreme positions, the amplitude of oscillations of the elastic beam decreases, which is superimposed on the overall amplitude-frequency characteristic of the system. The design of the vibration platform according to a single-beam scheme allows you to create both directed vibrations, in the case of installing two vibration exciters, and circular vibrations, in the case of installing one vibration exciter, which, on the one hand, expands the range of manufactured products, and on the other hand simplifies the design, which overall increases the efficiency of use of the device. At the same time, the installation of a vibration exciter with the possibility of its rotation (for example, using a rotating clutch, a rotary disk, etc.) completely eliminates the negative transport effect (displacement of the mixture in the form), which is typical for vibration platforms with circular vibrations, which also increases the efficiency of use of the device.

The device is illustrated by drawings, where in Fig.1 shows a General view of the device (two-beam scheme); figure 2 is a bottom view; figure 3 is a side view; figure 4 is a General view of the device according to option 2; figure 5 is a bottom view with two vibration exciters, figure 6 is a vibration platform according to option 3, a bottom view.

The vibrating platform for compaction of concrete mixtures, made according to the two-beam scheme (Fig. 1, Fig. 2, Fig. 3), consists of a working body 1, made in the form of a table, on which a form 2 with a mixture 3 is fixed. The working body 1 is supported by springs 4 on the basis of 5. On the lower side of the working body 1, on the supports 6, elastic (longitudinal) beams 7 are fixed, on which vibration exciters 8 are installed with unbalances 9 on the bushings 10, the axis of rotation of which are parallel to the axes of the elastic beams 7.

The vibrating plate for compaction of concrete mixtures according to the second embodiment is made according to a single-beam scheme (Fig. 4, Fig. 5) and also consists of a working body 1 with a mold 2 with a mixture 3 supported by shock absorbers, for example, springs 4 on the base 5. On the lower side the working body 1, on the supports 6, one longitudinal elastic beam 7 is fixed, on which two vibration exciters 8 with unbalances 9 are mounted movably, the axis of rotation of which are perpendicular to the axis of the elastic beam 7.

According to option 3 (Fig. 6.), the vibrating plate for compaction of concrete mixtures consists of a working body 1, form 2 with a mixture 3, resting on the base 5 using springs 4. One longitudinal beam 7 with a vibration exciter 8 is fixed on the supports 6 on a rotating coupling, equipped with unbalances 9, which excite circular oscillations.

The device according to option 1 works as follows. The work of the vibrating platform, made according to the two-beam scheme, begins with the installation on the working body 1 of form 2 and filling it with a mixture of 3 (Fig.1-Fig.3). To create directional oscillations, vibration exciters 8 are simultaneously turned on in antiphase, for which rotation is set in opposite directions to unbalances 9, which, with the help of a regulating device, create the necessary frequency for operating in resonance mode (the regulating control system is conditionally not shown). Moreover, by displacing the vibration exciters 8 along two elastic beams 7 to the sides from the center, they additionally regulate, in particular, reduce the amplitude of the system’s vibrations due to the vibration of the elastic beams 7 themselves.

The operation of the vibrating platform according to option 2, made according to the single-beam scheme, begins with the installation on the working body 1 of form 2 and filling it with a mixture of 3 (Fig. 4, Fig. 5). To create directional oscillations, vibration exciters 8 are simultaneously turned on in antiphase, for which rotation is set in opposite directions to unbalances 9, which, with the help of a regulating device, create the necessary frequency for operating in resonance mode (the regulating control system is conditionally not shown). Moreover, by displacing the vibration exciters 8 along one elastic beam 7 to the side from the center, they additionally control, in particular, reduce the amplitude of the system’s vibrations due to the vibration of the elastic beam 7 itself.

When removing one vibration exciter from the vibration platform (option 3), arranged according to a single-beam scheme, a simplified design with one vibration exciter arises - vibration platform with circular vibrations (Fig.6). In this case, three modes of operation can be created: in the first mode, the direction of the axis of the unbalance shaft coincides with the axis of the elastic beam; in the second mode - perpendicular to the axis of the beam; in the third mode, the vibration exciter is constantly rotated, the time of one revolution of which is less than or equal to the vibration time. The first mode is effectively used when forming extended products, such as piles, (the resulting unbalance force is directed perpendicular to the axis of the elastic beam), the second mode is when forming flat products, such as adapter plates, (the resulting unbalance force is directed parallel to the axis of the elastic beam); the third mode - when molding products of complex construction, for example, special highly reinforced products from especially heavy concrete for the construction of nuclear power plants (in this case, the resulting unbalance force will move around the circumference along with the rotation of the vibration exciter, negating the effect of the negative transport effect - displacement of the mixture in one way).

The use of a vibrating platform for compaction of concrete mixtures in the construction industry will make it possible, using almost one device, to significantly expand the range of manufactured products used in real construction practice.

The method of molding products on a vibratory platform was tested in the construction laboratory of the department of PSK TSTU and showed the possibility of its implementation in real conditions of construction production.

Claims (4)

1. Vibration platform for compaction of concrete mixtures, including a working body connected to a longitudinal elastic beam, vibration exciter, shock absorbers and a base, characterized in that the vibration exciters are movable, they are equipped with antiphase unbalances and are mounted on two elastic beams, while the beams are fixed with lower side of the working body. 2. The vibration platform according to claim 1, characterized in that each vibration exciter is mounted to rotate around the longitudinal axis of the elastic beam. 3. A vibrating platform for compaction of concrete mixtures, including a working body connected to a longitudinal elastic beam, a vibration exciter, shock absorbers and a base, characterized in that one longitudinal elastic beam with two vibration exciters mounted on it is movably mounted on the lower side of the working body, and the shaft axes with unbalances of vibration exciters are directed perpendicular to the axis of the elastic beam. 4. A vibrating platform for compaction of concrete mixtures, including a working body connected to a longitudinal elastic beam, vibration exciter, shock absorbers and a base, characterized in that one vibration exciter is installed on the longitudinal elastic beam with the possibility of its rotation through 360 ° and rotation about its axis.

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