GB2160436A

GB2160436A - Pusher centrifuge

Info

Publication number: GB2160436A
Application number: GB08514363A
Authority: GB
Inventors: Josef Meyer; Willy Jakobs
Original assignee: Kloeckner Humboldt Deutz AG
Current assignee: Kloeckner Humboldt Deutz AG
Priority date: 1984-06-06
Filing date: 1985-06-06
Publication date: 1985-12-24
Also published as: SE8502783D0; SE8502783L; DE3421036A1; FR2565506A1; GB8514363D0

Abstract

A centrifuge drum encloses a pusher plate (not shown) which is axially reciprocated by a double-acting hydraulic ram enclosed within the rotating shaft 1 on which the drum is mounted. The shaft is hollow to form the ram cylinder, and the ram piston 2, to which the pusher plate is connected by rod 3, is reciprocated in the cylinder by fluid fed through ducts 5, 9, 10. <IMAGE>

Description

SPECIFICATION Pusher centrifuge The invention relates to a pusher centrifuge, the centrifuge drum of which is equipped with a doubleacting hydraulic piston-cylinder unit for the pushing drive and with a rotational drive, the drive shaft of the rotational drive being constructed as a hollow shaft.

A multi-stage pusher centrifuge of the above type of construction is known from the CH-PS 312 160, in which the double-acting hydraulic piston-cylinder unit is disposed at the outer end of the driving shaft, constructed in the form of a hollow shaft. In this case, the supply of the pressure media to the pistoncylinder unit is effected via a plurality of bores which are disposed extending radially in the hollow driving shaft and which are fed with pressure fluid from stationary supply pipes. This known pusher centrifuge is comparatively expensive from the construction point of view, however, and requires an increased amount of floor space.

The invention seeks to simplify the supply and discharge of pressure media to and from the pistoncylinder unit of the pusher centrifuge both from the constructional point of view and in its method of action.

According to the invention, there is provided a pusher centrifuge, comprising a centrifuge drum equipped with a double-acting hydraulic pistoncylinder unit for providing the pushing drive and with a rotational drive, the driving shaft of the rotational drive being constructed as a hollow shaft, wherein the hydraulic piston-cylinder unit is disposed in the hollow shaft of the rotational drive.

As a result of the fact that, according to the invention, the hydraulic piston-cylinder unit is disposed in the hollow shaft of the rotational drive, a very compact and above all space-saving construction of the centrifuge is very advantageously achieved. The hollow shaft rotational drive may serve as the cylinder of the piston-cylinder unit in which the piston is guided for axial movement and is in operational communication, on the one hand with the centrifuge drum via a piston rod, and on the other hand with conduits, which are guided for axial movement, for the supply and discharge of the hydraulic pressure media. The supply of hydraulic pressure media to the piston-cylinder unit is considerably simplified by these measures, in a very advantageous manner, and the actual efficiency is improved.

The invention will now be described in greater detail, by way of example, with reference to the drawing, the single figure of which is a diagrammatic sectional view of the drive of a pusher centrifuge in accordance with the invention.

As the drawings shows, the drive comprises a hollow shaft 1 which acts on a centrifuge drum, not ilustrated in the drawing, of a pusher centrifuge.

Disposed inside this hollow shaft lisa piston 2 which is rigidly connected, via a piston rod 3, to a pushing part of the centrifuge, likewise not illustrated in the drawing. The piston 2 is provided with an axial bore 4 and with a bearing bush 4' disposed therein, into which there leads the inner or central pipe 5 of a pipe assembly disposed centrally and spaced apart. The bearing bush 4' takes over a sealing function as well as a bearing function. The bore 4 is followed by radial and axial bores 6 and 7 which lead into an annular chamber 8 between the hollow shaft 1 and the piston rod 3.

The central pipe 5 is disposed in a pipe 9 which surrounds the pipe 5 with a spacing and which in turn is held in a further concentric pipe 10. These pipes 5,9 and 10, which are disposed centrally and spaced apart, are guided for axial movement in a bearing brush 11 inside the hollow driving shaft 1 and are rigidly connected, at the outer end, to a connection head 12 for the supply of pressure media. In this case, the connection head 12 also serves at the same time to reverse the supply and discharge of the pressure media to and from the piston-cylinder unit and hence the reciprocating movement of the piston 2 with the piston rod 3 and pushing part of the centrifuge secured thereto. The control of the supply and discharge of the pressure media is effected in a manner known per se, not illustrated in the drawing.

The central pipe 5 is provided, in the region inside the piston 2, with a flange 13 which is in operational communication with the piston 2 through a roller thrust bearing 14 and a threaded ring 15. The hollow shaft 1 is shut off from the outside by a bearing flange 16. Leading into an annular chamber 17 formed between the threaded ring 15 and the bearing flange 16 is the pipe 9 which is in open communication with a bore 18, provided in the connection head 12, for the supply and discharge of pressure media.

When the pusher centrifuge is in operation, the centrifuge drum is set in rotation via the driving shaft constructed in the form of the hollow shaft 1.

In the course of this, the piston 2 and the piston rod 3 with the pushing part connected thereto, disposed in the hollow shaft, are also set in rotation. As a result of the arrangement of the roller thrust bearing 14 in the piston 2, the rotational movement is not transmitted to the pipes 5,9 and 10. These pipes are therefore disposed in the piston in such a manner that they are only entrained in the axial direction by the piston 2. By this means, a supply and discharge of pressure fluid to and from the pressure cylinder constructed in the form of a hollow shaft is achieved which is always reliable and wear-resistant in a very advantageous manner.As a result of supplying pressure fluid through the central pipe 5 and bore 6 and 7 into the annular chamber 8, the piston 2 is displaced from right to left, while as a result of supplying pressure fluid through the pipe 9 into the annular chamber 17 a displacement of the piston 2 from left to right is effected. As a result of alternating admission of pressure fluid to the piston 2 through the pipelines 5 and 9, the piston 2 and hence the piston rod 3 connected to the piston with the pushing part secured thereto, is set in a reciprocating motion or oscillating motion, as well as the rotational motion. The particular advantage of this drive device for the pusher centrifuge consists in that the supply and discharge of pressure fluid to and from the annular chambers 8 and 17 provided at the two sides of the piston 2, is effected through pipes which are not subjected to any rotation. The supply and discharge of the pressure fluid to and from the piston-cylinder unit of the pusher centrifuge is considerably simplified as a result of this.

Claims

lA A pusher centrifuge, comprising a centrifuge drum equipped with a double-acting hydraulic piston-cylinder unit for providing the pushing drive and with a rotational drive, the driving shaft of the rotational drive being constructed as a hollow shaft, wherein the hydraulic piston-cylinder unit is' disposed in the hollow shaft of the rotational drive.
2. A centrifuge as claimed in Claim 1,wherein the hollow shaft of the rotational drive serves as the cylinder of the piston-cylinder unit in which the piston is guided for axial movement and is in operational communication, on the one hand with the centrifuge drum for movement via a piston rod and, on the other hand with conduits or pipes, which are guided for axial movement, for the supply and discharge of the hydraulic pressure media.
3. A centrifuge as claimed in Claim 1 or 2, wherein the piston is provided with an axial bore into which the inner of the conduits or pipes for the supply and discharge of the pressure medium ieads.
4. A centrifuge as claimed in Claim 1,2 or 3, wherein a bearing is disposed between the conduits or pipes, for the supply and discharge of the pressure media and the piston.
5. A pusher centrifuge substantially as described herein with reference to the drawings.