Heating – Work chamber having heating means – Having means by which work is progressed or moved mechanically
Patent
1987-03-20
1988-02-09
Yuen, Henry C.
Heating
Work chamber having heating means
Having means by which work is progressed or moved mechanically
432124, 432239, 198774, F27B 914
Patent
active
047239093
DESCRIPTION:
BRIEF SUMMARY
CROSS-REFERENCE TO RELATED APPLICATION
This is a National Phase application of PCT/FR86/00264 filed July 24, 1986 and based upon French national application No. 85 11 569 filed July 24, 1985.
FIELD OF THE INVENTION
The present invention relates to ovens with walking beams in which the walking beams form at least two successive assemblies mechanically independent of each other and each being movable by means of a hydraulic jack connected to one or more supply pumps. These ovens enable products to be heated to be advanced at different speeds in the two regions of the oven corresponding to the two assemblies, which is advantageous for example when the oven is loaded partially with hot products coming from continuous casting.
BACKGROUND OF THE INVENTION
When the oven is used in a way in which the two assemblies of beams are to move articles at the same speed, it is difficult to ensure perfect synchronization between the two assemblies, because of mechanical, electronic or hydraulic imperfections, leaks in the jacks for example. This lack of synchronization results in subjecting the supports to very high forces and to displace the products during heating, which causes difficulties during removal from the oven and may even cause overlapping of these products.
To overcome this drawback it has been proposed to provide, on the one hand, means for coupling the two beam assemblies together and, on the other hand, logic control means for providing synchronized operation of the jacks. But the ovens thus constructed are complicated.
OBJECT OF THE INVENTION
The present invention has as an object an oven with mobile beams of the above mentioned type but in which the synchronized movement of the two assemblies of beams is obtained by simple means.
SUMMARY OF THE INVENTION
The oven with walking beams of the invention is characterized in that one of the assemblies of beams comprises a retractable stop able to come into contact with the other assembly so that each of these assemblies may push the other, and in that the supply means for the jacks comprise distributers enabling a circuit to be set up comprising in series one of the supply pumps, the control jack for one of the assemblies, the control jack of the other assembly and a nonreturn valve.
When the distributors are disposed so as to form the above circuit and when the stop has been brought to its active position, the liquid delivered by the pump actuates the jack of the first assembly, which pushes back the second assembly through the medium of the stop. The nonreturn valve generates a counter pressure which brakes the movement of the second assembly so that the stop carried by one of the assemblies remains in contact with the other assembly.
The oven may comprise more than two beam assemblies, in which case each beam assembly except one has a retractable stop which may come into contact with one of the adjacent beam assemblies and the distributors allow a circuit to be formed in comprising series the assembly of the control jacks.
BRIEF DESCRIPTION OF THE DRAWING
One embodiment of an oven with walking beams will be described hereafter by way of non limitative example, with reference to the accompanying drawings in which:
FIG. 1 is a diagrammatic view showing the oven when the two beam assemblies move independently according to the invention; and
FIG. 2 is a view similar to FIG. 1, showing the oven when the two assemblies move in synchronism.
SPECIFIC DESCRIPTION
Such as is shown in the drawings, the walking beam oven of the invention includes a frame 1a for unloading the oven and a frame 1b for loading the oven. Each of these frames comprises beams 2 which are movable horizontally on a bed 3 and may be moved on this bed by a jack 4a or 4b. Bed 3 may itself be moved both vertically and horizontally on fixed ramps 5 by means of jacks 6.
Jack 4a is connected to a reversable pump 7a by means of pipes 8a and 9a in which an exchange block 10a is inserted; furthermore, a valve 11a is inserted in pipe 8a whereas a valve 12a and two distributors 13a and 14a
REFERENCES:
patent: 3721519 (1973-03-01), Venetta
patent: 3749550 (1973-07-01), Sugdam
patent: 4102449 (1978-07-01), Shufran
patent: 4403954 (1983-09-01), Kokeguchi et al.
patent: 4492565 (1985-01-01), Feroldi
patent: 4505670 (1985-03-01), Silverstrini et al.
patent: 4624637 (1986-11-01), Genesio et al.
patent: 4669939 (1987-06-01), Harada et al.
Patents Abstracts of Japan, vol. 9, No. 41, (C-267) (1764), 21 Feb. 1985, & JP, A, 59185722, (Sumitomo Kinkozu K.K.) 22 Oct. 1984.
Dubno Herbert
Ross Karl F.
Stein Heurtey
Yuen Henry C.
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