DE7902790U1 - BUILDING MATERIAL MIXER WITH PROTECTIVELY INSULATED ELECTRIC MOTOR DRIVE - Google Patents

Description

Building material mixer with fully insulated electromotive drive

The invention relates to a building material mixer with a protective insulation, Electric motor drive of the mixer drum, in which the electric motor is encompassed by a hood and with intervening is flanged by insulating bodies to the machine frame and in which there is at least one insulating in the drive gear train Part, e.g. B. drive wheel, and also a switch-plug combination are provided.

Such a building material mixer is known from DE-PS 21 37 157.

The construction disclosed therein is based on the regulations VDE 0730. Then the electric motor is flanged to the machine frame via an insulating plate. In the drive countershaft there is an insulating part, which is formed by a V-belt pulley made of plastic. Also is a switch-plug combination is attached to the outside of the hood, which makes it necessary to form the hood in two parts. When assembling and connecting the two hood parts, the switch-plug combination is connected to the Electric motor connected. If you distance both parts of the hood, then at the same time the connection between the switch plug * - Combination and the electric motor interrupted. One can therefore only connect to the circuit of the with the help of tools Electric motor arrive when the power supply is interrupted.

for a building material mixer with the qualification of protection class II to develop that does not make a significant change in shape on the mixer

makes necessary and yet sufficient security in terms of on contact protection, insensitivity to damage and avoidance of improper interventions guaranteed.

Based on the above-mentioned, known arrangement, the essence of the invention is that on a console The electric motor, hanging downwards in the direction of the open hood side, flanged both the switch-plug combination as well as a protective plate, in particular made of an insulating material, which at least almost covers the open side of the hood, and that the electric motor with normal, prevailing the console Screws is attached, each of which is encompassed by two sleeve-shaped insulating bodies, one of which is body with A collar-like ansdz penetrates the hole in the console and the other body is guided on the approach and is arranged as a spacer between the console and the motor flange.

In addition, the Erfhdung provides that the protective plate between

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see flange parts of the switch-plug combination and the Electric motor is clamped, it is recommended that the lower edge of the hood protect the switch-plug combination encompasses.

In the subject matter of the invention, the hood does not need to be constructed in several parts. Rather, one can use a hood shape, which is common for non-insulated booster mixers. One such a hood is designed to be open at the bottom. The three-dimensional shape of such hoods would have the disadvantage that tampering with the electric motor is possible for those who are not skilled in the art, which could break the protective insulation.

This possibility is with the arrangement of the protective plate in the area the front hood opening avoided. For this can

a cheap, mass-produced component, in particular made of plastic can be used. The particular advantage of the arrangement of this protective plate is that it only can be solved by unscrewing the switch-plug combination from the electric motor. But this is also the power supply interrupted to the electric motor, so that necessary work on the gearbox, for example retensioning of the V-belt pull, can be done safely.

When the switch-plug combination is part of a design the invention is encompassed by the lower edge of the hood, then there is also sufficient protection against mechanical damage given the switch-plug combination, quite apart from the fact that it provides improved protection against climatic influences is brought about.

Details of the invention are shown in the drawing by way of example and shown schematically. Show it:

1 * shows a longitudinal section through a hood of a building material mixer with fully insulated electromotive drive and

Fig. 2: a longitudinal section through a flange connection of the electric motor on the machine frame in an enlarged

Depiction.

In the embodiment of FIG. 1, the machine frame are with 1 and the swivel arm with 2 of a building material mixer, in particular a tilting drum mixer, indicated schematically. With the machine frame 1 is connected to a downwardly open hood 3, which converts the electric motor drive of the building material mixer

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engages. For this purpose, a bracket 4 is screwed to the machine frame 1. The console 4 can be made from a shaped sheet steel component exist. But it is also possible to manufacture the console 4 from an impact-resistant plastic. Hangs on console 4 the electric motor 5, whose horizontally located drive shaft carries a drive wheel 6, for example a V-belt pulley, which is connected via the transmission member 8 to the output gear 7 for the Miechertrommel, not shown. One of those components 6, 7, 8 should consist of an insulating body. When executing

The example of the invention is preferred to use the drive wheel 6 Plastic or other insulating material to form. This is one from the electric motor 5 to the swivel arm 2 and the mixer drum leading protection against accidental contact.

The electric motor 5 is with its flange 10 on an insulating body and normal iron screws 11 connected to the flange 9 of the bracket 4. Structural details of a suitable insulating body design can be taken from FIG. 2. In this way the contact protection between the Ebktromotor 5 and the console 4 is brought about, so that the electric motor 5 with none of the Iron parts of the building material mixer can come into contact.

The switch / plug combination 13 is connected to the electric motor 5. So it has no direct contact with the hood 3.

The connection is made schematically by the flange parts 16, 17

indicated. In order to prevent access to the electric motor 5, in this embodiment there is flange connection 16, 17 a protective plate 14, primarily made of an insulating material, clamped in, which largely closes the open hood side 15.

If the protective plate 14 were to be made of metal, would have to

a safety distance to the hood 3 must be maintained. When making made of an insulating material, which is

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Example is preferred, the open hood side 15 can almost to be fully completed. The Schutzplaife "· 4 is like this clamped between the flange parts 16, 17 so that they can only be removed if the switch-plug combination 13 solves. But then the power supply to the electric motor 5 is also interrupted.

It is now advisable to adjust the lower edge 18 of the hood 3 in this way choose so that the switch-plug combination 13 is enclosed will. This measure has the advantage that you do not damage al switch-plug combination by clumsy handling can, which is possible, for example, when beam-like heavy components are naturally along the lower edge the hood 3 are moved and thus against the switch-plug combination 13 can strike. The shape of the lower edge of the hood 18 is to be chosen so that the connection of a Plug of the connecting cable and the operation of the switch are easily possible.

In the embodiment of FIG. 2 it is shown how to use normal iron screws 11 an insulated connection of the Electric motor 5 with the console 4, or its flange 9 can bring about. For this purpose is the single machine screw Π encompassed by two sleeve-shaped insulating bodies 19, 21, of which the one insulating body 19 is supported on the outside of the flange 9 and with a collar-like extension 20 the The flange 9 reaches through, but does not strike the flange 10 of the electric motor 5. The approach 20 is from the sleeve-shaped Enclosed around the insulating body 21, which in turn acts as a spacer element between the flanges 9, 10. About the stop 22 is In addition to the guidance of both insulating bodies 19, 21, there is also an axial fixation against one another, so that it is possible to seal

that when the screw 11 is loosened, the outer insulating body is accidentally lost. The stop 22 and the corresponding mating surface of the insulating body 21 are designed in such a way that that they can reach behind like a snap.

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Parts list:

1 machine frame

2 swivel arm

3 hood

4 console

5 electric motor

6 drive wheel

7 output gear

over

δ transmission member 9 flange 10 flange.

11 screw

12 insulators

13 Switch-plug combination

14 protective plate

15 open hood side

16 flange part

17 flange part

18 lower edge of the hood

19 sleeve-shaped insulating body 20 collar-like approach

21 sleeve-shaped insulator

22 stop

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Claims (3)

Protection claims: 1. Building material mixer with fully insulated, electromotive Drive of the mixer drum, in which the electric motor is encompassed by a hood and with the interposition of insulating bodies is flanged to the machine base and in which there is at least one insulating part in the drive gear train, z. B. drive wheel, and also a switch-plug combination are provided, characterized in that the on a console (4) after tmten In the direction of the open hood side (15) there is a flanged electric motor (3) and the holder-plug combination (13) as well as a protective plate (14) which at least almost covers the open hood side (15), in particular made of an insulating material, and that the electric motor (3) with normal, the console (4) penetrate Screws (11) is attached, each of which is encompassed by two sleeve-shaped insulating bodies (19, 21) of which one body (19) with a collar-like extension (20) penetrates the bore of the console (4) and the other Body (21) guided and held on the extension (20) and as a spacer between the console (4) and the motor flange (10) is arranged. 2. Building material mixer according to claim 1, characterized in that the protective plate (14) between the flange share (16, 17) the switch-plug combination (13) and the electric motor (3) is clamped. " ² " 3. Building material mixer according to claim 1, characterized in that g e k e η η - \ draws that the lower edge (18) of the hood the Protective encompassed switch-plug combination (15). Dipl.-Ing.H.-D.Ernicke patent attorney 10 15 20 25 30