Process and installation for the heat treatment of cylindrical bodies, especially pipes
First Claim
1. A method for heat treating cylindrical bodies, which comprises the steps of positioning the cylindrical bodies parallel to one another, and transporting the parallel bodies through a plurality of successive temperature zones comprising at least a drying zone, a high temperature heating zone and a cooling zone to dry, heat and cool said bodies while being transported, the transporting step being performed while rotating said cylindrical bodies about their individual axes, the rotational velocity of bodies being transported through one zone being independent from their forward velocity and independent from the rotational and forward velocities of other bodies being simultaneously transported through the other temperature zones.
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Abstract
The invention relates to a process and to an installation for the heat treatment of cylindrical bodies, in particular pipes, of ceramic material. During the treatment, the pipes are dried, heated and sintered, and subsequently cooled, in successively arranged chambers.
During transportation through the drying zone, the heating zone and the cooling zone, as well as in heat treatment during sintering, the objects are turned about their own axis independently of the transportation rate, so that they are not only evenly heated, but a possible deformation is also prevented. This type of transportation and heating with possible heat exchange between the individual zones makes possible a rapid heating-up without detriment to the cylindrical bodies, and thus a short design length of the installation. Above all, the sintering zone, which must consist of high-value, ceramic material due to the high temperatures, can be kept very small.
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Citations
21 Claims
- 1. A method for heat treating cylindrical bodies, which comprises the steps of positioning the cylindrical bodies parallel to one another, and transporting the parallel bodies through a plurality of successive temperature zones comprising at least a drying zone, a high temperature heating zone and a cooling zone to dry, heat and cool said bodies while being transported, the transporting step being performed while rotating said cylindrical bodies about their individual axes, the rotational velocity of bodies being transported through one zone being independent from their forward velocity and independent from the rotational and forward velocities of other bodies being simultaneously transported through the other temperature zones.
- 11. An apparatus for heat treating cylindrical bodies, which comprises a plurality of treatment chambers comprising at least a drying chamber, a high temperature heating chamber and a cooling chamber, means for drying, heating and cooling said bodies while being transported through said chambers, and means for transporting through said chambers the cylindrical bodies in a parallel arrangement spaced from one another, said transporting means including means for rotating the cylindrical bodies about their individual axes and means for their forward translation through said chambers, the rate of movement of the rotating means in one chamber being independent from the rate of movement of the forward translation means in said one chamber and independent from the rate of movement of the rotating and forward translation means simultaneously operating in the other chambers.
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20. A method for heat treating cylindrical bodies, which comprises the steps of positioning the cylindrical bodies in a substantially horizontal arrangement, and transporting the bodies through a plurality of successive temperature zones comprising at least a drying zone, a high temperature heating zone and a cooling zone to dry, heat and cool said bodies while being transported, the transporting step being performed while rotating said cylindrical bodies about their individual axes, the rotational velocity of bodies being transported through one zone being independent from their forward velocity and independent from the rotational and forward velocities of other bodies being simultaneously transported through the other temperature zones.
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21. An apparatus for heat treating cylindrical bodies, which comprises a plurality of treatment chambers comprising at least a drying chamber, a high temperature heating chamber and a cooling chamber, means for drying, heating and cooling said bodies while being transported through said chambers, and means for transporting through said chambers the cylindrical bodies in a substantially horizontal arrangement spaced from one another, said transporting means including means for rotating the cylindrical bodies about their individual axes and means for their forward translation through said chambers, the rate of movement of the rotating means in one chamber being independent from the rate of movement of the forward translation means in said one chamber and independent from the rate of movement of the rotating and forward translation means simultaneously operating in the other chambers.
Specification