US2973790A

US2973790A - Multi-stage presses

Info

Publication number: US2973790A
Application number: US832875A
Authority: US
Inventors: Huetter Will
Original assignee: ALFRED VAN HUELLEN; HERBERT VAN HUELLEN
Current assignee: ALFRED VAN HUELLEN; HERBERT VAN HUELLEN
Priority date: 1959-04-23
Filing date: 1959-04-23
Publication date: 1961-03-07
Anticipated expiration: 1978-03-07

Description

March 7, 1961 w. HUETTER 2,973,790

MULTL-STAGE PRESSES Filed April 23, 1959 2 Sheets-Sheet 2 III i'l III - Aviwmn W/LL HUEJ'IER A 1 TQQRNE ys United States Patent MULTI-STAGE PRESSES Will Huetter, Kreteld, Germany, assignor to Herbert van Huellen and Alfred van Huellen, trading as the firm Niederrheinische Maschinenfabrik Becker and van Huellen, Krefeld, Germany Filed Apr. 23, 1959, Ser. No. 832,875 1 Claim. (Cl. 144-281) The invention relates to a press, more particularly a multi-stage press having a hood for leading away noxious corrosion inducing gases and vapours which emerge from the press space particularly when opening the press.

With presses of this kind, which are intended for the production of veneer plates, the press abutments are usually provided with a cooling plate built in front thereof, which is connected by means of a grate with a heating plate. Even if such a hood is joined to a conduit connected to a chimney or a suction fan and hence subjected to a reduced pressure, a portion of the noxious gases and vapours, which on opening the press rise upwardly, flows unavoidably into the grate chamber between the cooling and heating plates fixed to the upper press abutment. It mustbe borne in mind moreover, that these two plates and the grate disposed therebetween, taken together, are stretched out somewhat after the manner of a bellows when the pressure ceases and correspondingly enlarges the grate space. In this chamber a certain lowering of pressure occurs, as the grate space enlarges, which favours the induction of the noxious gases and vapours. The consequence of this is a relatively rapid destruction of the grate due to the corrosion. The grate must then be exchanged for a new grate with a correspondingly long stoppage of the press.

An object of the invention is to prevent positively, in a simple manner, the penetration of noxious gases and vapours into the grate space between cooling and heating plates.

The multi-stage press comprises a cross beam having an upper horizontal member and a lower horizontal member spaced from said upper member, the members having apertures, a plurality of spaced vertical walls connecting the members and forming passages therewith, a cooling plate fixed to said lower member. The cooling plate is provided with a plurality of perforations communicating with the apertures in the lower member. A heating plate spaced from the cooling plate is provided, as is a grate securing the heating plate to the cooling plate and forming a grate space therebetween. The grate has notches communicating the grate space with the passages.

in the crossbeam through the perforations in the cooling plate. There are provided conduit, means connected with the apertures in the upper member for introducing compressed air into the passages and into the grate space. A gas discharge hood is disposedabove the crossbeam for withdrawing noxious gases and is provided with an exit duct. The pressure of compressed air prevents noxious gases from penetrating into the grate space.

The invention will be described further, by way of example, with reference to the accompanying drawings, in which:

Fig. 1 is a partial vertical section through the upper partof a multiple-stage press; and

Patented Mar. 7, 1961 Fig. 2 is a plan of the grate which is installed between i can preferably be connected to a flue or to a suction fan.

In addition to the previously described known press construction there is provided a conduit 8 equipped with a throttle or blocking oii member 7. This conduit conducts a compressed gas and passes through the discharge hood 5. The conduit 8 is in unobstructed communication by way of branch conduits 9, passages 10 in the press cross beam 1 and passages 11 in the cooling plate 2, with a grate space 12 between the cooling plate and the heating plate 4. The passages 10 may be formed by means of closed hollow spaces of the cross beam construction with upper and lower passage apertures 13 (Fig. 1). The unobstructed communication between the space 12 in which the grate is disposed and the hood 5 is made possible by means ofnotches 14 in the bars of the grate 3.

The compressed gas conducted through the conduit 8, for example compressed air, as a rule needs onlyto be subject to a small excess pressure of a few millimetres of water. The gas flows through the passages 11 into the center of the grate space lz'andspreads out in all directions over this space through grate notches 14. Thus the noxious gases coming out of the press space are prevented from penetrating into the grate space 12.

I claim:

In a multi-stage press, in combination, at least one cross beam having an upper horizontal member and a lower horizontal member spaced from said upper member, both said members having apertures, a plurality of spaced vertical walls connecting both said members and forming passages therewith communicating with said aper-- and with atmosphere, conduit means connected with the apertures in, said upper member for introducing compressed air into said passages and into said grate space, a. gas discharge hood disposed above said crossbeam for withdrawing noxious gases and having an exit duct, wherev by the pressure of compressed air prevents noxious gases from penetrating into the grate space.

References Cited in the file of this patent UNITED STATES PATENTS France Nov. 18, 1953