Impact tool and method for a hammer device that includes impact tool housing and tubular piston structured and arranged for axial displacement in impact tool housing via pressure medium. Tubular piston has essentially radial pressure surfaces structured and arranged on opposite portions of tubular piston to be acted on with pressure medium. Grooves are formed in impact tool housing that are structured and arranged for a reversal of a direction of a pressure medium impingement on pressure surfaces and discharge or recirculation of medium. Grooves include a control recess formed in tubular piston and at least two control grooves for a shift of pressure medium impingement on pressure surfaces that are arranged axially offset in impact tool housing. A controller is structured and arranged to alternatively activate one of the at least two control grooves via connection channels.

The invention relates to a method and to a device for repairing the spout sleeve (6) of a metallurgical vessel which is fitted securely within the refractory lining (4, 5) of the vessel (1). According to the invention the sleeve is repaired by applying mortar to the casting channel (7) of the sleeve (6) with a mortar dispenser (9) that can be inserted into the casting channel (7), which upon removing the mortar dispenser from the casting channel calibrates the latter over the entire length of the channel. The mortar dispenser (9) is driven rotating coaxially to the casting channel (7) during the mortar application and, after a defined time, is removed from the casting channel (7), still rotating. The method is particularly suitable for repairing the inner sleeve of a casting ladle with a slide closure adjoining the ladle spout, maintenance of which is automatically carried out in a maintenance station of the casting facility. In this case the invention makes provision such that the repair of the inner sleeve is also carried out automatically here during the maintenance of the slide closure.

A tap hole plug gun comprising a material chamber for receiving a plugging compound and a mouthpiece for being placed on a tap hole, the mouthpiece being connected to a nozzle part disposed on the material chamber by means of an unlockable connection device. The connection device is realized as a hinged joint arrangement, the hinged joint arrangement having two opposite hinged joints each having a joint bolt which can be removed from the connection to a joint plate arrangement.

An apparatus for shaving a tap hole surface of a blast furnace or the like wherein efficiency can be improved, and a worker can be freed from physically burdensome work in the vicinity of the lower furnace wall of a blast furnace under high temperature. The apparatus includes a surface shaving unit having smoothing bits, and a rotating mechanism unit that, when the surface shaving unit is pressed against the tap hole surface, rotates the surface shaving unit, by utilizing the pressing force, by a predetermined angle in a predetermined direction substantially parallel to the surface, and holds the surface shaving unit at the rotated position. The rotating mechanism unit eliminates the need for work such that every time a conventional surface shaving unit is separated from the tap hole surface after being pressed against the surface, a worker manually rotates the surface shaving unit by a predetermined angle.

The invention relates to a manipulator arm (12) for being connected to a manipulator chassis frame (11) disposed in particular in the periphery of a metallurgical smelting furnace, the manipulator arm (12) having a proximal end (35) for being connected to the manipulator chassis frame (11) and a distal end (16, 41) equipped with a first tool receptacle (17) and serving to be connected to a shovel (20, 43). The manipulator arm (12) has a second tool receptacle at its distal end (16, 41), the second tool receptacle being formed irrespective of the first tool receptacle (17) and being intended to be connected to a hammer mill (29) or a drilling machine

A melting unit for melting down casting materials and a method for producing molten material for casting.

A manipulator arm for being connected to a manipulator chassis frame disposed in particular in the periphery of a metallurgical smelting furnace includes a proximal end for being connected to the manipulator chassis frame and a distal end equipped with a first tool receptacle and serving to be connected to a shovel or bucket. The manipulator arm has a second tool receptacle at its distal end, the second tool receptacle being formed irrespective of the first tool receptacle and being intended to be connected to a hammer mill or a drilling machine.