Lubricated mixing device for reaction plastics and method for generating reaction plastics

A mixing device for generating reaction plastic, the mixing device comprising:

• a mixing chamber configured to mix reactive components to generate the reaction plastic;
• a discharge unit, including a discharge pipe, connected to the mixing chamber and configured to discharge the reaction plastic generated in the mixing chamber;
• a cleaning piston that is axially aligned with the discharge pipe of the discharge unit and is moveable into the discharge pipe to clean reaction plastic from the discharge pipe;
• a fluid supply device configured to provide a lubricant into the discharge unit via an outlet in order to lubricate the discharge unit, wherein
• the fluid supply device is configured to lubricate movement of the cleaning piston in the discharge pipe, wherein
• the fluid supply device comprises a gas supply device configured to provide gas together with the lubricant via the outlet into the discharge unit, wherein the fluid supply device is configured to provide the lubricant into the discharge unit while the cleaning piston is moved into the discharge pipe and while the cleaning piston is moved out of the discharge pipe,
• a control piston, arranged within the mixing chamber, configured to control flows of the reactive components, wherein
• an axial direction of the control piston is oblique-to an axial direction of the discharge pipe of the discharge unit;
• wherein the fluid supply device comprises a lubricating device configured to provide the lubricant, the lubricating device being connected to the gas supply device, wherein the lubricating device comprises at least one of a pneumatic or hydraulic valve and, when the cleaning piston is not cleaning the discharge pipe, the cleaning piston is configured to leave open a crossover between the mixing chamber and the discharge pipe;
• and
• the outlet is located at the crossover between the mixing chamber and the discharge pipe.