Foundry mixing machine |
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| 申请号 | US46714374 | 申请日 | 1974-05-06 | 公开(公告)号 | US3929320A | 公开(公告)日 | 1975-12-30 |
| 申请人 | ESCHER WYSS LTD; | 发明人 | HALLER WALTER; | ||||
| 摘要 | A foundry mixing machine for preparing a mixture of sand and an admixture is disclosed; the machine has an inlet for the sand, followed by an annular slot for the sand, then an annular admixing space and an outlet for the mixture; a feeding device for the admixture is disposed on the admixing space and leads into the admixing space; between the admixing space and the outlet for the mixture there are disposed two relative to one another rotatable bodies of revolution between which an annular intermediate space is left open for the mixture; the bodies have projections towards the intermediate space; the form of the projections is shown; furthermore improvements on the feeding device for the admixture are shown. | ||||||
| 权利要求 | 1. A 1foundry mixing machine for preparing a mixture of sand and an additive having at least two liquid components, the machine comprising a. wall means defining a sand inlet chamber, a preliminary mixing chamber located below the inlet chamber, and an annular slot positioned vertically between said chambers and serving to allow sand to descend by gravity, and in the form of an annular curtain, from the inlet chamber to the preliminary mixing chamber, b. said slot being defined by cooperating walls which are movable relatively to each other to vary the width of the slot; c. a feeding and spraying device in the preliminary mixing chamber and including a separate duct for each of said liquid components and an additional duct for compressed air, d. the ducts leading into the preliminary mixing chamber and being so arranged relatively to each other and to said slot that compressed air admixes the liquid components and propels the admixture into said annular curtain of sand which descends through said slot; e. an annular final mixing chamber having an inlet at its inner margin which communicates with the preliminary mixing chamber at a region radially outward of said descending annular curtain of sand, and an outlet at its outer margin, f. the final mixing chamber being defined by a gap bounded by two axially spaced, relatively rotatable bodies of revolution, each of which carries projections which extend toward the gap; g. a drive motor located below, and connected to cause relative rotation of, said bodies of revolution; and h. additional wall means which surrounds the bodies of revolution and defines a duct which leads mixture existing from the outlet of the final mixing chamber downward to an outlet located below said bodies of revolution. 2. A mixing machine as defined in claim 1 in which each body of revolution has a base wall from which the projections extend; and the projections of the two bodies overlap one another in the direction normal to said base walls. 3. A mixing machine as defined in claim 2 in which said projections are solid annular walls. 4. A mixing machine as defined in claim 3 in which each projection has, on its upstream side, a surface inclined in the direction of flow of mixture through the final mixing chamber. 5. A mixing machine as defined in claim 3 including blades carried by each projection of one of the bodies of revolution which extend in the direction of flow of mixture nearly to the adjacent projection on the other body of revolution. 6. A mixing machine as defined in claim 1 including magnetic means associated with at least one of the bodies of revolution and serving to hold the body to a supporting element. 7. A mixing machine as defined in claim 6 in which said one body of revolution and said supporting element are made of non-magnetic and magnetic materials, respectively; and including permanent magnet means built into said one body of revolution. 8. A mixing machine as defined in claim 1 in which the projections of each body of revolution are spaced axially from the other body a distance just sufficient for the passage therebetween of the mixture. 9. A mixing machine as defined in claim 1 in which the preliminary and final mixing chambers lie in a common plane. 10. A mixing machine as defined in claim 1 in which said ducts have outlets so arranged that the compressed air issuing from its duct impinges upon the liquid components issuing from the other ducts. 11. A mixing machine as defined in claim 10 in which the outlet of the compressed air duct is located radially outward of the other outlets. 12. A mixing device as defined in claim 10 in which the outlet of the compressed air duct includes a nozzle for the compressed air. 13. A mixing machine as defined in claim 10 in which the feeding and spraying device includes wall means which defines a feed chamber having a cylindrical side and an open lower end which leads into the preliminary mixing chamber; and the outlets of said ducts open into the feed chamber. 14. A mixing machine as defined in claim 13 in which the outlet of the compressed air duct opens tangentially into said feed chamber. 15. A mixing machine as defined in claim 13 in which the outlets of the ducts for the liquid components are arranged to direct said components against the cylindrical side of the feed chamber. 16. A mixing machine as defined in claim 1 in which said feeding and spraying device is located at the center of the preliminary mixing chamber. 17. A mixing machine as defined in claim 1 including an enclosing casing having two separable sections which can be parted easily to afford free access to at least one of said bodies of revolution. 18. A mixing machine as defined in claim 17 in which said separable sections join in a plane along which lies the final mixing chamber. 19. A mixing machine as defined in claim 1 including an enclosing casing having three separable sections, there being an upper section which contains said sand inlet chamber, annular slot and feeding and spraying device, an intermediate section which is formed on the inside as one of said bodies of revolution, and a lower section defined by said additional wall means; and clamping means interconnecting the upper and lower casing sections and holding those sections against the intermediate section. 20. A mixing machine as defined in claim 1 including a supply pipe connected to each of said liquid component ducts and provided with a pilot valve; a servomotor connected to effect relative movement between said slot-defining walls and thereby open and close said slot; and switching means connected to control the drive motor, the pilot valves and the servomoor and having at least a first state in which it switches off the drive motor, causes the pilot valves to block flow of liquid to said ducts and causes the servomotor to effect closure of said slot, a second state in which it energizes the drive motor and maintains the pilot valves and the servomotor in their initial positions, and a third state in which it energizes the drive motor, causes the servomotor to open the slot and causes the pilot valves to interconnect the ducts and the supply pipes. 21. A mixing machine as defined in claim 20 in which each supply pipe is connected to receive a liquid component from a variable delivery dosing pump; and each supply pipe is provided with an overflow device which carries away the liquid delivered thereto by the associated pump when the pilot valve blocks flow from the pipe to the associated duct. 22. A mixing machine as defined in claim 2 in which each dosing pump is driven by an electric motor connected with a potentiometer which controls its speed, whereby the delivery rates of the pumps are controlled by the settings of the potentiometers. 23. A mixing machine as defined in claim 22 in which each electric motor is provided with a group of parallel connected potentiometers, and with a selector switch which serves selectively to connect the motor in a circuit with any one of the potentiometers of the associated group. 24. A mixing machine as defined in claim 23 in which the selector switches are incorporated in the switching means and are so arranged that each pump motor is shut off in said first state and runs under the control of different potentiometers in said second and third states. 25. A mixing machine as defined in claim 20 including a pipe connected to supply compressed air to said compressed air duct and provided with a pilot valve; and wherein the pilot valve of the compressed air pipe is connected to be opened and closed by the switching means in unison with the other pilot valves. 26. A mixing machine as defined in claim 1 in which all of said elements are incorporated in an assembly which is mounted for pivotal movement on an arm; and said arm is mounted in an upright standard for rotational movement about its longitudinal axis. 27. A mixing machine as defined in claim 26 including a pair of servomoTors, one being connected to pivot the assembly relatively to the arm, and the other being connected to rotate the arm in the upright standard; and common control means, including a control stick, for operating the servomotors. |
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