The object of the invention is a mechanical rotary casting sand reclaimer, having a base with a grain hole and a lock, wherein the base contains a rotor supported by a vertical bearing, coupled with a driving motor by means of a belt transmission, and an abrasive ring installed on the base and enclosed within a cylindrical casing oriented concentrically to the rotor. The reclamation unit comprises an abrasive ring (5) with a profiled internal surface and a cylindrical external surface with lugs on its perimeter and on the bottom of the ring located within the cylindrical casing (4). It further comprises a rotor supported by a vertical bearing, the rotor having abrasive blades or rods (6) and located in the base concentrically to the abrasive ring (5). The rotor is connected with a driving motor (7) by means of the belt transmission. It further comprises a ring air blade (9) installed on the top surface of the abrasive ring (5), the ring air blade having a dedusting chamber casing (10) attached to it. The casing (10) is equipped with a casting sand batch hole (11) and a side revision window (12). On the top surface of the abrasive ring (5) there is further installed, coaxially with the axis of the chamber, a telescopic dedusting duct (14) ending (13), the dedusting duct (14) being connected with a dedusting cyclone (17) and a suction fan (18). The dedusting duct (14) has sensors (15) for measuring air velocity and a triboelectric dust counter; the sensors (15) being connected with a triboelectric sensor signal converter (16) and a controller of the rotational speed of the driving motor (7).

A method of reclaiming casting sand com1wises the steps of throwing casting sand into a processing tank and reclaiming the casting sand while air pressure in the processing tank is kept lower than air pressure outside the processing tank, and discharging the reclaimed casting sand from the processing tank while the internal air pressure is kept higher than the external air pressure.

An apparatus for reclaiming and cooling casting sand, comprising means for fluidizing casting sand, means disposed above the fluidizing means for cooling the fluidized casting sand, means disposed above the cooling means for scaling bonds from particles of the casting sand by friction, and means disposed above the cooling means for having relatively large dust particles sedimented is characterized by the bond-scaling means, being configured such that the reclaimed casting sand can be discharged into the fluidizing means therethrough.

An einer Sandregeneriereinrichtung zum mechanischen Abreinigen von Sandkörnern, insbesondere von organisch und anorganisch gebundenen Formsanden ist ein Behälter in Form eines Zylinders (9) angeordnet. Durch den Zylinder (9) ist koaxial eine zentrale, hohle Antriebswelle (10) angeordnet, welche drehbar gelagert ist. An dieser Hohlwelle (10) sind ein oder mehrere Teller (5,7) fest verbunden. Zwischen Teller (5,7) und Zylinder (9) ist jeweils ein Spalt (16). Durch die Drehbewegung der Teller (5,7) entsteht zwischen dem drehenden Teil und dem stehenden Teil der Sandsäule eine Trennebene, in der eine intensive Korn an Korn Reibung stattfindet. Durch die Zentrifugalkraft wird der Sand in Richtung der Zylinderwand und durch den Spalt (16) getragen, was zusätzlich zu einer intensiven Korn an Korn Reibung führt. Der bei der Reibung entstandene Staub, mehrheitlich abgeriebene Binderpartikel, wird mit Hilfe der Absaugung über Öffnungen (17), die in der Hohlwelle (10) angebracht sind, fortlaufend durch die Hohlwelle (10) abgesaugt.

An apparatus for removing binder, mould coating agent and fine sand particles from the moulding sand used for casting moulds to regenerate the sand for re-use. The apparatus comprises a rotor (20) for scattering moulding sand falling from a hopper (18), and a friction ring (21) surrounding the rotor and having a flange (28) at its upper end and a seal plate (27) at its lower end. Friction between sand particles in accumulation assures efficient regeneration. This serves to render the apparatus small-sized and imparts improved durability.

[Problem] To reclaim molding sand that has been discharged from green sand casting equipment, using only dry mechanical reclamation.

[Solution] A method comprising a step of measuring a water content and a magnetized matter content of molding sand discharged from green sand casting equipment; a step of comparing the measured water content with a first control value, and if the water content exceeds the first control value, drying the molding sand until the water content becomes equal to or less than the first control value; a step of comparing the measured magnetized matter content with a second control value, and if the magnetized matter content exceeds the second control value, magnetically separating the molding sand until the magnetized matter content becomes equal to or less than the second control value; thereafter, a step of reclaiming the molding sand by dry mechanical reclamation until a loss-on-ignition becomes equal to or less than a third control value; and a step of classifying the molding sand until a total clay content becomes equal to or less than a fourth control value.

The object of the invention is a mechanical rotary casting sand reclaimer, having a base with a grain hole and a lock, wherein the base contains a rotor supported by a vertical bearing, coupled with a driving motor by means of a belt transmission, and an abrasive ring installed on the base and enclosed within a cylindrical casing oriented concentrically to the rotor. The reclamation unit comprises an abrasive ring (5) with a profiled internal surface and a cylindrical external surface with lugs on its perimeter and on the bottom of the ring located within the cylindrical casing (4). It further comprises a rotor supported by a vertical bearing, the rotor having abrasive blades or rods (6) and located in the base concentrically to the abrasive ring (5). The rotor is connected with a driving motor (7) by means of the belt transmission. It further comprises a ring air blade (9) installed on the top surface of the abrasive ring (5), the ring air blade having a dedusting chamber casing (10) attached to it. The casing (10) is equipped with a casting sand batch hole (11) and a side revision window (12). On the top surface of the abrasive ring (5) there is further installed, coaxially with the axis of the chamber, a telescopic dedusting duct (14) ending (13), the dedusting duct (14) being connected with a dedusting cyclone (17) and a suction fan (18). The dedusting duct (14) has sensors (15) for measuring air velocity and a triboelectric dust counter; the sensors (15) being connected with a triboelectric sensor signal converter (16) and a controller of the rotational speed of the driving motor (7).

A method of reclaiming casting sand comprises the steps of throwing casting sand into a processing tank (1) and reclaiming the casting sand while air pressure in the processing tank (1) is kept lower than air pressure outside the processing tank, and discharging the reclaimed casting sand from the processing tank while the internal air pressure is kept higher than the external air pressure.

An apparatus for reclaiming and cooling casting sand, comprising means (p) for fluidizing casting sand, means disposed above the fluidizing means for cooling the fluidized casting sand, means disposed above the cooling means for scaling (2) bonds from particles of the casting sand by friction, and means disposed above the cooling means for having relatively large dust particles sedimented is characterized by the bond-scaling means, being configured such that the reclaimed casting sand can be discharged into the fluidizing means therethrough.