FR2599125A1 - Device for linking backward-moving bars of a grid in a combustion furnace - Google Patents

Abstract

The present invention relates to a device for linking bars of a grid in a combustion furnace. The device is characterised in that it comprises, arranged between two adjacent bars 1, a member 2 keeping the bars 1 juxtaposed together and arranged both to prevent raising of one bar with respect to the adjacent bar and to prevent the bars moving apart. The invention finds an application in the field of industrial incineration.

Description

 The present invention relates to a device for connecting the bars of a grid, in particular with a backward movement, of a combustion or incineration hearth.

 The invention finds particular application in large industrial homes where the grid carpet is subdivided into several grid tracks in which the sub-grid air is blown zone by zone.

 There are already known devices for connecting the bars of a grid with a backward movement using a system of pins preventing the lifting of a bar relative to its adjacent or neighboring bar.

 However, this known method of connection has the drawback of allowing the bars to move away from each other, causing fuel losses and the uncontrolled passage of combustion air into the space between two adjacent bars during the movement of the fuel. from one end to the other of the hearth.

 The object of the present invention is to eliminate the above drawback by proposing a device for connecting the bars of a grate of a combustion hearth, characterized in that it comprises, arranged between two adjacent bars, a member now the bars juxtaposed between them and arranged to prevent both the lifting of a bar relative to the adjacent bar and the bars to move apart.

 According to one embodiment, the aforementioned member is disposed in a housing of conjugate shape defined in the nose portion of two adjacent ships.

 According to another characteristic of the invention, the aforementioned member is in the form of a double T.

 According to yet another characteristic of the invention, the aforementioned member is in the form of a double dovetail.

 According to another embodiment, or the bars have lower ribs, the aforementioned member comprises a bolt fixing by their juxtaposed ribs two adjacent bars.

The invention will be better understood and other objects, characteristics, details and advantages thereof will appear more clearly during the explanatory description which follows, made with reference to the appended schematic drawings given solely by way of example illustrating two modes of realization of the invention and in which
- Figure 1 is a top view of two grid tracks incorporating the two embodiments of the device according to the present invention
- Figure 2 is a view along arrow II of Figure 1
- Figure 3 is a view along arrow III of Figure 2 and showing the first embodiment of the device of the invention; and
- Figure 4 is a sectional view along line IV-IV of Figure 1 showing the second embodiment of the device of the invention.

 Referring to Figure 1, there is shown only three bars 1 forming part of a step of a grate track of a combustion or incineration hearth, it being understood that a grid comprises one or more tracks longitudinal parallel, each of which consists of steps, each step consisting of a set of bars transversely juxtaposed, and intended to carry the layer in combustion. As is known per se, the bars 1 are assembled in groups of bars with relative mobility serving to stir the fuel layer during the movement from one end to another of the hearth.

 According to a first embodiment of the invention, the device comprises a member 2 holding the bars juxtaposed between them and arranged to prevent both the lifting of a bar relative to the adjacent bar and the bars to move apart.

 The holding member 2 is disposed in a housing 3 of conjugate form å-the member 2 and defined by a first cavity 3a formed in the nose portion 4a or upstream end of a bar 1 and a second cavity 3b defined in the nose portion 4b or upstream end of the adjacent bar, the cavities 3a and 3bétant symmetrical with respect to the plane perpendicular to Figure 3 passing between the two adjacent bars.

 According to a first alternative embodiment, the cavities 3a and 3b are each in the form of a T so that the holding member 2 has the form of a double T.

 According to a second alternative embodiment, the cavities 3a and 3b are each in the form of a dovetail so that the holding member 2 has the form of a double dovetail.

 The holding member 2 is held in its housing 3 by an appropriate means such as in particular a plate 5, for example made of steel, blocking the opening of the housing 3 and fixed in the present case by welding only on the front face of the nose from one of the two adjacent bars 1, the plates 5 being removed in FIG. 3 for clarity. One can also provide for the attachment of the retaining member with one of the bars, in particular by a welding point.

 The device described above is perfectly suited for the grids whose bars have a relative movement, that is to say the grids whose air distribution takes place through a slot r made between two adjacent bars 1, this relative movement being due to the presence of the clearance resulting from the assembly of the holding member 2 in its housing 3.

 For the grilles whose bars have no relative movement, and where the blown air passes through an orifice (not shown) made in the nerardage nose 6 of each bar, it is preferable to use the connection device according to the second embodiment shown in Figure 4.

 According to this embodiment, the bars are of the type comprising lower ribs 7 and are linked juxtaposed with each other by holding member 2 which is constituted by a bolt passing through the ribs 7. This connecting device may be rigid or of preferably mounted with a slight clearance allowing the differential expansion of the bars relative to each other.

 The bolt through holes are optionally oblong to provide the clearance necessary for relative longitudinal mobility of the assembled bars.

Claims (6)

 1. Device for connecting the bars of a grid, in particular with a backward movement, of a combustion or incineration hearth, characterized in that it comprises, arranged between two adjacent bars (1), a member (2 ) now the bars juxtaposed between them and arranged to prevent both the lifting of a bar relative to the adjacent bar and the bars to move apart.  2. Device according to claim 1, characterized in that the aforementioned member (2) is disposed in a housing (3) of conjugate shape defined in the nose portion of two adjacent bars.  3. Device according to claim 2, characterized in that the aforementioned member (2) is in the form of a double T.  4. Device according to claim 2, characterized in that the aforementioned member (2) is in the form of a double dovetail.  5. Device according to one of the preceding claims, characterized in that the aforementioned holding member (2) is held in its housing (3) by a plate (5), preferably made of steel, welded on the front face of the nose of one of the two adjacent bars (1).  6. Device according to claim 1, of the type where the bars have lower ribs, characterized in that the holding member (2) mentioned above is constituted by a bolt fixing by their juxtaposed ribs (7) two adjacent bars (1) .