초록 ▼

A method and apparatus for protecting a mixing apparatus for producing strand-shaped explosives and propellants in a twin-shaft screw extruder, the housing of which is formed of housing parts connected to a clamping device acting under hydraulic pressure. In order to compensate for excessive pressur

A method and apparatus for protecting a mixing apparatus for producing strand-shaped explosives and propellants in a twin-shaft screw extruder, the housing of which is formed of housing parts connected to a clamping device acting under hydraulic pressure. In order to compensate for excessive pressure and to prevent abrupt opening of the mixing chamber, the torque developed at the screw shafts is continuously monitered and fed to a control and storage device together with temperature and pressure values measured at the end of the screw shaft in the material being processed. If one of the measure values exceeds a permissable limit, a signal is produced to change the operating condition of the screw extruder, particularly to stop and withdraw the extruder from the housing, to halt the drive motor of the extruder shafts and to open the extruder housing by relieving the clamping device.

대표청구항 ▼

A safety method for protecting a mixing apparatus in which strand-shaped explosives and propellants are produced by a screw extruder, said method comprising forming a housing for a screw extruder of a mixing apparatus for the production of strand-shaped explosives and propellants of a plurality of s

A safety method for protecting a mixing apparatus in which strand-shaped explosives and propellants are produced by a screw extruder, said method comprising forming a housing for a screw extruder of a mixing apparatus for the production of strand-shaped explosives and propellants of a plurality of separable housing parts, clamping the housing parts together under hydraulic pressure, driving screw shafts of the screw extruder in the housing with a determined torque to mix the material being processed, continuously measuring the torque at which the screw shafts are driven, measuring the temperature of the material in the housing after mixing by the screw shafts, mesuring the pressure of the material in the housing after mixing by the screw shafts, respectively comparing the measured values of torque, temperature and pressure with predetermined limit values thereof, and in the event any one of the measured values exceeds the respective limit value, halting the drive of the screw shafts of the screw extruder, separating the screw shafts from the housing, and unclamping the housing parts by relieving the hydraulic pressure acting thereon.