WO2013034247A1

WO2013034247A1 - Internal vibrator having plastic-coated light metal vibration body

Info

Publication number: WO2013034247A1
Application number: PCT/EP2012/003526
Authority: WO
Inventors: Otto W. Stenzel; Alexander Bambynek; Dirk Sibila; Sascha PARNKLIB
Original assignee: Wacker Neuson Produktion GmbH & Co. KG
Priority date: 2011-09-08
Filing date: 2012-08-20
Publication date: 2013-03-14
Also published as: DE202011110466U1; DE102011112872A1

Abstract

An internal vibrator has a vibration body (1) and a plastic layer (2) at least partially covering the vibration body (1). The vibration body (1) forms a housing in which a vibration-inducing mechanism (9) is arranged. In at least one housing section, the vibration body (1) is made from light metal or a light metal alloy, the plastic layer (2) at least partially covering the outside of the housing section.

Description

Internal vibrator with plastic coated

Alloy body vibration

description

The invention relates to a Innenrüttelvorrichtung for compacting concrete.

Internal vibrator devices usually have an elongate vibrating body, also referred to as a vibrating body. When the inner vibrator is properly used, i. during the compacting of concrete, the vibrating body is at least partially immersed in the concrete and vibrated. The vibrating body may be connected to a protective or operating hose which is attached to one end of the vibrating body and via which, for example, a power supply can take place.

Internal vibrators can be designed as a hose vibrator or as a bending wave vibrator. In hose vibrators, an electric motor is housed in the rear end of the vibrating body. The rear end describes here the closer the protective or operating hose end of the vibrating body. In the case of flexible shaft vibrators, only one imbalance is accommodated in the vibrating bottle, while the drive is effected via a bending shaft driven by an external motor via the operating hose. In the vibrating body, a vibration generator with pendulum drive or one or more eccentric weights can be arranged.

The vibrating body is usually made of steel and forms a housing for the vibration generating device.

The concrete compaction by means of an internal vibrator is effected by direct contact of the outer surface of the vibrating vibrating body with the fresh concrete. This can lead to shocks of the vibrating body to a formwork or to reinforcing bars, which can lead to imprints in the formwork or damage to the vibrating body or coated rebar. Furthermore, the movement of the vibrating body in the concrete sludge can lead to abrasive wear of the wall material of the vibrating body. To avoid these problems, the vibrating body may be covered with a plastic layer that is more elastic than steel. Such an internal vibrator with a vibrating body with plastic casing is known from DE-U-1 724 786.

The efficiency of compacting the concrete of a Innenrüttelvorrichtung in compacting the concrete is influenced by the vibration amplitude of the vibrating body. In order to achieve efficient compacting of the concrete, the vibrating body during operation should have a large amplitude.

The invention has for its object to provide a Innenrüttelvorrichtung that allows an increased amplitude and thus a more efficient concrete compaction.

The object is achieved by a Innenrüttelvorrichtung according to claim 1. Further developments of the internal vibrating device can be found in the dependent claims.

The inner vibrator device according to the invention has a vibrating body and a plastic layer at least partially covering the vibrating body. The vibrating body forms a housing in which a Schwingungserzeugungsein- device is arranged. The material of the vibration body is in at least one housing portion of the vibrating body a light metal or a light metal alloy and the plastic layer covers the housing portion outside at least partially. The vibrating body forms a hollow body whose wall consists at least partially of light metal or a light metal alloy. The cavity of the vibrating body receives the vibration generating means. By choosing the light metal or the light metal alloy as material for the wall of the vibrating body, a weight reduction compared to the conventional material steel is achieved. Thereby, the dead weight of the vibrating body can be reduced, whereby at the same energy input an increased vibration amplitude can be achieved compared to a heavier steel vibration body. The vibrating body may consist entirely of light metal or a light metal alloy. Other components that may be arranged in or on the vibrating body, may also consist of other materials. The plastic layer at least partially covers the housing section in which the vibration body consists of light metal or the light metal alloy. As a result, the plastic layer can protect the areas of the housing section lying below the plastic layer with regard to abrasive wear and with regard to corrosion caused, for example, by the liquid concrete.

The plastic layer may be an HNBR layer (hydrogenated acrylonitrile-butadiene rubber).

The plastic layer can firmly adhere to the surface of the vibrating body with or without adhesion promoter.

The vibration generating device arranged in the interior of the vibration body may have an imbalance and a drive for moving the imbalance. The drive may be connected to an external power supply via a hose attachable to the vibrating body. In the interior of the vibrating body, only an imbalance can be arranged, which via an operating hose by an external drive arranged outside the vibrating body, for. B. is movable via a bending shaft.

The light metal or the light metal alloy may have a density of less than 5000 kg / m ³ . Preferably, the density of the light metal or the light metal alloy is less than 3000 kg / m ³ .

The light metal or the light metal alloy may also contain admixtures or dopants, which may also be heavy metal atoms or heavier metals. The light metal or the light metal alloy may include a material from the group of magnesium, beryllium, aluminum, titanium and silicon, with magnesium and aluminum are preferable for reasons of cost.

The light metal alloy preferably has at least 50 atomic percent of one or more light metals. Particularly suitable is a proportion of at least 90 or 95 atomic percent. The light metal alloy may comprise aluminum and silicon and magnesium, for example, the light metal alloy AlSiMgO, 3, AlMgSiO, 5 or AlMgSi l be. The vibrating body may be closed at one end. As a result, the vibrating body forms a cap. The housing portion may include a front end of the vibrating body, ie, the terminal end of the cap.

The housing portion may include a portion of the vibrating body surrounding the imbalance. The fact that a reduction in mass has the stronger effect the nearer it is provided at the front end of the vibrating body, in particular affects embracing a near the front end of the vibrating body arranged imbalance with the light metal or the light metal alloy favorably.

Many plastics are not completely dense against water and electrolytes dissolved in it, so that the basic concrete vat may come into contact with the light metal or alloy under the plastic layer. This can lead to unwanted corrosion, especially with aluminum and magnesium. The corrosion can adversely affect the adhesion of the plastic layer on the vibrating body. It should be noted that the plastic layer can still provide protection, which can lead to at least slowed corrosion. For protection, the housing portion, in which the material is a light metal or a light metal alloy, externally have a coating as corrosion protection, which may be less permeable to water than the plastic layer. The coating may have a higher corrosion resistance to the basic concrete slurry than the material of the light metal or the light metal alloy.

Thereby, a detachment of the plastic layer, as may occur in the corrosion of the light metal or the light metal alloy, if the plastic layer adheres directly to the light metal or the light metal alloy with or without adhesion promoter, at least slowed down.

Thus, the life of the vibrating body can be extended, which may be particularly important for high quality Innenrüttelvorrichtungen. For inner hat It is not necessary to apply a coating to such devices, which are intended only for a limited period of use.

The coating may be a layer of a metal, such as zinc or tin, and may be applied to the light metal housing by arc spraying.

The coating can be temperature resistant up to 160 ° C and should have no holes. The material of the layer can adhere well to the light metal or the light metal alloy and be elastic. The outwardly facing surface of the coating may have sufficient roughness to allow for a calking effect of the adhesion promoter of the plastic layer. This roughness can be achieved for example by a sand and / or wire grain blasting process. The coating forming layer may be capable of withstanding the stress of sand and / or wire grain blasting without destroying the film.

During operation of the internal vibrating device, it may be necessary to dissipate the heat from the interior of the vibrating body to the concrete. This heat dissipation can be improved because of the higher thermal conductivity of the light metal and the light alloy compared to an embodiment in which steel alone is used as the material for the vibrating body.

Furthermore, the plastic coating can also have openings for heat dissipation. In particular in the area of the apertures, the coating described above can be provided to prevent corrosion.

The plastic layer may be at least partially tubular, wherein the tube may be at least partially fixedly connected to the vibrating body. For this purpose, an adhesion promoter can be provided between the plastic layer and the vibration body. The tube may also be a shrink tube.

The vibrating body can be formed in one piece and have one or more housing sections whose material is the light metal or the light metal alloy. Another housing section or other housing sections may also consist of other materials, such as steel. The vibration body may also have a plurality of interconnected components or components, wherein at least two components may be separably connected to one another. The first component may be a cap in which the imbalance is arranged. The second component can be arranged on the end closer to the operating hose end of the vibrating body, in which the drive for the unbalance, for example an electric motor, is arranged. In a connecting region between the first and the second component, a connecting element may be provided for the separable connection. The connecting element may have a thread or a latching device. The thread can be cylindrical or conical. A butt joint formed in the connection region can be covered by the plastic layer. This can prevent or reduce penetration of water of the concrete vat.

The plastic layer may cover the connecting region and / or a section of the first component adjoining the connecting region and / or a section of the second component adjoining the connecting region.

The housing section of light metal or the light metal alloy may comprise the connection region and / or the portion of the first and / or the second component.

Between the plastic layer and the portion of the first or second component covered by the plastic layer, a sealing element, e.g. be arranged in the form of an O-ring or a lip ring. By such a sealing element, a lateral penetration of water can be prevented or reduced.

It is also possible to provide two sealing elements arranged in this way, one of which is arranged between the first component and the plastic layer and the second between the second component and the plastic layer.

In the housing section, which has the light metal or the light metal alloy, at least one steel ring can form-fit and / or material-locking be connected to the vibrating body. The steel ring may have a lower coefficient of thermal expansion than the thermal expansion coefficient of a rolling bearing arranged in the region of the vibration generating device, wherein the steel ring may comprise the rolling bearing. The vibration generating device may also have a plurality of roller bearings.

With this measure, different thermal expansion coefficients of the vibration body made of light metal or the Leitmetalllegieru and the arranged in the region of the vibration generating device bearings are at least partially compensated. The material of the steel ring may be invar steel. The use of a light metal as the material of the vibrating body having a coefficient of thermal expansion higher than that of steel can result in an increase in the fit between the rolling bearing and the vibrating body due to heating in operation. Therefore, in the region of the bearing seats steel rings may be cast, which have a lower coefficient of thermal expansion than the rolling bearings, so that the composite of light metal vibrating body and steel ring insert has the same or at least similar thermal expansion coefficients as the rolling bearings. These and other advantages and features of the invention are explained in more detail below by means of examples with the aid of the accompanying figures.

Show it

1 is a perspective, schematic representation of an internal vibrating device with an operating hose,

2 shows a longitudinal section through a vibration body completely covered with a plastic layer,

3 shows a longitudinal section through a partially covered with plastic vibrating body, Fig. 4 shows a longitudinal section through a vibrating body with a

Coating as corrosion protection and a plastic layer, 5 shows a perspective, schematic representation of an internal vibrating device with a plastic layer with openings, FIG. 6 shows a longitudinal section of a vibrating body, in which a

Imbalance is arranged,

7a shows a longitudinal section of a vibrating body, which has two separable components,

FIG. 7b shows an enlargement of the connecting region of the longitudinal section according to FIG. 7a, FIG.

8a and 8b is a perspective, schematic representation of a vibrational onbody reinforced by steel rings and a

Longitudinal section through the vibrating body, and

9 shows a longitudinal section through a vibrating body with in

Inside the vibrating body arranged steel rings.

In the figures, identical or comparable features are provided with the same reference numeral.

Fig. 1 shows an embodiment of a Innenrüttelvorrich- device according to the invention.

The inner vibrator device has a vibrating body 1, which is covered by a plastic layer 2. The vibration body 1 forms a housing in which a vibration generating device is arranged, which is not shown in Fig. 1. An upper end 3 of the inner vibrator is connected to a protective or service hose 4. Depending on the embodiment of the internal vibrating device, a bending shaft and / or an energy supply (power line) can be arranged in the operating hose 4. The vibrating body 1 forms a closed at the opposite end of the operating hose 4 tube. The wall of the vibrating body 1 is made of light metal or a light metal alloy.

2 shows a longitudinal section through an embodiment of the vibrating body 1, which is covered with the plastic layer 2. The vibrating body 1 has an on one end closed, cylindrical shape and has a tubular housing portion 5, which consists of light metal or a light metal alloy. This housing section 5 comprises the front end of the vibrating body 1. Another tubular or cylindrical housing section 6, which is integrally connected to the housing section 5, may consist of steel or else of light metal or a light metal alloy.

In the embodiment shown in FIG. 2, the plastic layer 2 covers the vibrating body 1 almost completely on the outside, at least in the region relevant for the vibration transmission.

FIG. 3 shows a further embodiment of the plastic layer 2. In this embodiment, the plastic layer 2 only completely covers the light metal housing section 5 on the outside. As a result, the housing section 5 is protected by the plastic layer against wear and corrosion. The housing portion 6 is made of a material which is resistant to the concrete slurry, and is covered only in the connection region to the housing portion 5 of the plastic layer 2. Thereby, a lateral penetration of the water of the concrete vat can be reduced or prevented.

Fig. 4 shows a longitudinal section through the vibrating body 1, in which between the plastic layer 2 and the housing portion 5, a coating 7 is arranged. The coating 7 has a lower permeability to water and dissolved electrolyte than the plastic layer 2 and may be formed as a metallic layer, for example, zinc or tin. The coating 7 prevents better than the plastic layer 2, that the material of the housing portion 5 comes into contact with the water of the concrete vat, and thereby acts as corrosion protection. Because of the further features, reference is made to the description of FIG. With regard to the function and other possible embodiments of the coating 7, reference is made to the description of the coating in the general description part above.

In a further embodiment, not shown in the figures, of the inner rotor device, the plastic layer 2 and the coating 7, which are shown in FIG. 4, according to the embodiments of FIG. 2 completely cover the vibrating body 1 on the outside.

In Figs. 2 to 4, the vibration generating device is not shown in the interior of the vibrating body 1 for the sake of clarity. Fig. 5 shows another embodiment of a Innenrüttelvorrichtung. In this embodiment, the plastic layer has openings 8, at which the vibrating body 1 is exposed. As a result, the heat from the interior of the vibration body 1 can be better dissipated to the outside during operation. Openings for dissipating the heat are known from the patent DE 42 44 566 C2.

In the embodiment shown in FIG. 5, the vibrating body does not carry a coating in accordance with the coating 7 described in connection with FIG. 4. In another embodiment of the vibrating body, such a coating may be arranged in the region of the openings 8. As a result, the light metal or the light metal alloy is not exposed to the openings 8 to the outside. FIG. 6 shows an embodiment of the inner vibrator device with the vibrating body 1, the plastic layer 2 covering the vibrating body 1 and a vibrating device 9 arranged inside the vibrating body 1. The vibrating device 9 has an imbalance 11 arranged on an imbalance shaft 10 and also a Motor 12 for driving the imbalance shaft 10 on. The housing portion 5 made of light metal or a light metal alloy comprises the region of the vibrating body 1, which surrounds the imbalance 1 1. In addition, the front end of the vibrating body 1 is also part of the housing section 5. FIG. 7a shows an embodiment of the internal vibrating device with vibrating body 1, which has two components or components 1a, 1b which are separably connected. The component l a and the component l b are connected to one another in a separable manner by means of a connecting element 13. The connecting element 13 has a thread through which the components 1 a, 1 b can be screwed together by an inner and an outer thread.

Furthermore, the inner vibrator device according to FIG. 7 has a plastic layer 2b which covers the component 1b, the region of the connecting element 13 and an adjoining section of the component 1a. In a further embodiment, the inner vibrator device can additionally have a plastic layer 2a, which covers the component 1a.

The plastic layer 2b is, as shown in the enlarged view Fig. 7b, via a butt joint of the two components la, lb in the region of the connecting elements 13 formed in the region of the component la overlapping. As a result, the danger of a lateral penetration of water under the plastic layer 2b in the region of the connecting element 13 and of the component 1b can be reduced.

In a further embodiment, a sealing element 14 is provided between the plastic layer 2b and the component 1a, e.g. in the form of an O-ring. This sealing element 14 can prevent lateral penetration of water under the plastic layer 2b in the region of the connecting element and the component lb.

In the embodiment illustrated in FIGS. 7a and 7b, the component 1b is made of light metal or a light metal alloy. In a further embodiment in which the plastic layer 2a is additionally provided, the material of the component la is also a light metal or a light metal alloy.

Figs. 8a and 8b show a further embodiment of the vibrating body 1 of an internal vibrating device in a perspective view and in a longitudinal section. For reasons of clarity, no plastic layer covering the vibrating body 1 is shown in these illustrations. But it can be arranged according to the above statements on the vibration body I. In the interior of the vibration body 1, an imbalance shaft 10, an imbalance 1 1, and two roller bearings 15 for the imbalance shaft 10 are arranged. In the area of the roller bearings 15, the vibration body 1 consists of light metal or a light metal alloy. In this area, steel rings 1 6, which comprise the vibrating body outside, arranged, wherein the steel rings 16 have a lower coefficient of thermal expansion than the rolling bearing 15. The reinforcing rings 16 comprise the roller bearing 15 and may be cast in the vibration body 2 in the region of the bearing seats of the roller bearings 15.

One, two or more steel rings 16 per rolling bearing 15 may be provided. The positioning of the steel rings can be adapted to the thermal expansion coefficients, material thicknesses and dimensions.

9 shows a further embodiment of the vibrating body 1 of an internal vibrating device with steel rings 16 in longitudinal section. This embodiment differs from that shown in Figs. 8a and 8b illustrated embodiment in the arrangement of the steel rings 16th

Inside the vibrating body 1, the imbalance shaft 10, the unbalance 1 1, and the two bearings 15 are arranged. The steel rings 16 comprise the rolling bearings 15 and are cast in the region of the bearing seats of the rolling bearings 15 inside the vibrating body 1, wherein the steel rings 16 have a lower coefficient of thermal expansion than the rolling bearing 15 and thus compensate for the larger thermal expansion coefficient of the vibrating body 1. As a result, the fit for the rolling bearings 1 5 can be obtained.

Claims

claims

1 . Internal vibrator, with

a vibration body (1) forming a housing, in which a vibration generating device (9) is arranged, and

a synthetic material layer (2) at least partially covering the vibrating body (1); in which

the material of the vibrating body (1) in at least one housing section of the vibrating body (2) is a light metal or a light metal alloy; and

the plastic layer (2) the housing portion outside at least partially covered.

2. Innenrüttelvorrichtung according to claim 1, characterized in that the light metal or the light metal alloy has a density less than 5000 kg / m ³ .

3. Innenrüttelvorrichtung according to any one of the preceding claims, characterized in that the light metal is a material from the group of Mg, Be, Al, Ti and Si or the light metal alloy comprises a material from the group of Mg, Be, Al, Ti and Si ,

4. Innenrüttelvorrichtung according to any one of the preceding claims, characterized in that the housin seabschnitt a front end of the vibrating body (2).

5. Innenrüttelvorrichtung according to any one of the preceding claims, characterized in that

the vibrating generator (9) has an imbalance (1 1); and the housing section includes a portion of the vibrating body (1) surrounding the imbalance (I I).

6. Innenrüttelvorrichtung according to any one of the preceding claims, characterized in that the housing portion has a coating on the outside (7) as corrosion protection, which is less permeable to water than the plastic layer (2).

7. Innenrüttelvorrichtung according to any one of the preceding claims, characterized in that the plastic layer (2) Du rchbrüche (8).

8. Innenrüttelvorrichtung according to any one of the preceding claims, characterized in that the plastic layer (2) is at least partially tubular and / or as on the surface of the vibrating body (1) adhering coating is formed.

9. Innenrüttelvorrichtung according to any one of the preceding claims, characterized in that the vibrating body (2) is integrally formed or a plurality of interconnected components (l a, lb).

10. Innenrüttelvorrichtung according to one of claims 1 to 8, characterized in that

the vibrating body (1) has at least two components (1a, 1b);

- The two components (la, l b) are separably connected to each other;

the plastic layer (2) has a connection region in which the two components (1a, 1b) are connected to one another, and / or a section of the first component (1a) adjoining the connection region and / or a section of the second component (FIG. lb) covered; and

the housing section contains the connection region and / or the section of the first and / or the second component (1a, 1b).

1 1. Innenrüttelvorrichtung according to claim 10, characterized in that between the plastic layer (2) and the of the plastic layer (2) covered portion, a sealing element (14) is arranged.

12. Innenrüttelvorrichtung according to any one of the preceding claims, characterized in that

- In the housing portion at least one steel ring (16) positively and / or materially connected to the vibrating body (2) is connected;

the steel ring (16) has a lower coefficient of thermal expansion than the thermal expansion coefficient of a rolling bearing (15) arranged in the region of the vibration generating device (9); and

- The steel ring (16) includes the rolling bearing (15).

13. Innenrüttelvorrichtung according to any one of the preceding claims, characterized in that the housing portion is tubular.