[특허]Safety device for a pneumatic membrane press

Vaslin Bucher S.A.

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Safety device for a pneumatic membrane press

국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F16P-007/00
미국특허분류(USC)	100/347; 100/345
출원번호	US-0233617 (2002-09-04)
우선권정보	FR-2001-111440 (2001-09-04)
발명자 / 주소	Fouillet, Jacques
출원인 / 주소	Vaslin Bucher S.A.
대리인 / 주소	Young & Thompson
인용정보	피인용 횟수 : 0 인용 특허 : 3

초록
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A safety device for a pneumatic membrane press with door(s) comprises at least one unit for controlled establishment of a leak, each optionally associated with a cooperating opening/door assembly. Each unit includes an actuator module comprising an opening for receiving a key mounted on the door of the press and an actuating member whose position depends on the presence or not of the key in the opening; and a valve module comprising a sealing member for a circulation duct between an aperture in fluid connection with one or more inflation volume(s) pressurised when the press is pressurised and an aperture opening into the open air, the actuating member allowing the closure of the duct by the sealing member when the key is in the receiving opening and forcing the freeing of the duct when the key is not in the opening.

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1. Safety device for a pneumatic membrane press having at least one inlet for insertion of materials to be pressed or discharge of solid pressing residues, said inlet adapted to be closed by a door, the device comprising:at least one unit for controlled establishment of a leak;each unit being associated with a cooperating inlet and door;each unit including an actuator module comprising an opening for receiving a key mounted on the door under consideration, and an actuating member whose position depends on the presence of the key in said opening;a valve module comprising a sealing member for a circulation duct between a first aperture in fluid connection with one or more inflation volume pressurized when the press is pressurized, and a second aperture opening into the open air;the actuating member allowing the closure of said circulation duct by the sealing member, when the key is present or totally engaged in the opening, and forcing the freeing of said duct when the, key is not in said opening or is insufficiently engaged in said opening;the inflation volume corresponding to an internal volume jointly defined by a membrane and a part of a wall of a tank of the press; anda pneumatic sealing module which is controlled by the pressure applied when the tank is pressurized and whose state is controlled by the unit; said pneumatic sealing module being mounted in the region of an opening of an escape duct in direct connection with the volume of the pressurized tank. 2. The safety device according to claim 1, wherein the sealing member is biased into the closure position of the circulation duct by the action of a resilient member and is displaced beyond said closure position by the action of the actuating member. 3. The safety device according to claim 1, wherein the sealing member is in the form of a ball resiliently biased by a compression spring against a seat formed by an annular indent produced in a central portion of the circulation duct, forming in cooperation a reverse-lock valve in the direction of the second aperture; the actuating member comprising a moving lug, which can be displaced in the circulation duct between a retracted position in which said lug is not in contact with or does not rest on said ball, and an opened-out position in which said lug engages said ball to detach it from said seat. 4. The safety device according to claim 2, wherein the operational connection between the key and the actuating member of the actuator module is mechanical, and the valve module is formed from two partially recessed blocks each enclosing a part of the circulation duct, arid one of the two apertures opening therefrom, and forming, by assembly, a central portion of said duct, comprising a seat suitable for adjusted reception of the sealing member and a bearing surface for the resilient member. 5. The safety device according to claim 1, wherein the unit is mounted directly on the tank. 6. The safety device according to claim 1, wherein the pneumatic sealing module substantially comprises a moving piece which is displaced by the pressure becoming established in an inflation volume when the tank is pressurized in a sealing position in which the moving piece tightly closes the escape duct against a return force biasing said moving piece in a freeing position. 7. The safety device according to claim 6, wherein the moving piece is displaced in or against the escape duct to achieve the tight seal thereof, due to the effect of a thrust force which is at least slightly greater than the recoil force generated by the pressure in the tank. 8. The safety device according to claim 6, wherein the moving piece is displaced in or against the escape duct to achieve the tight seal thereof, due to the effect of a thrust force which is at least slightly greater than the recoil force generated by the pressure in the tank. 9. The safety device according to claim 1, wherein the pneumatic sealing module comprises a flexible and tight membrane carrying a m oving piece located facing and close to an escape duct produced in a part of the wall of the tank which with the membrane defines the internal volume receiving the flow of air for pressurizing said press and capable of sealing said escape duct tightly by the action of a suitable pressure force, and a support plate carrying said membrane and comprising a recessed part defining, with said membrane and on the side remote from that carrying the moving piece, the inflation volume; said inflation volume being pressurized when the press is pressurized by a connection piece equipped with a reverse-lock shutter and tightly connected to the part of the wall of the tank provided with the escape duct, said connection piece being in fluid connection parallel to the first aperture of the valve module. 10. The safety device according to claim 9, wherein the support plate carrying and covering the membrane is mounted on an external face of the part of the wall of the tank by a plurality of mutually spaced fixing and bracing pieces between them defining communication ducts with the open air, and said moving piece comprising a sealing joint connected to the membrane by a holding piece associated with a counterpiece assembled together an& mounted on either side of said membrane. 11. The safety device according to claim 1, wherein the escape duct is dimensioned such that the air discharge rate via said escape duct is at least slightly greater than the rate delivered by the source of air ensuring pressurization of the press and inflation of the internal inflation volume. 12. Safety device for a pneumatic membrane press having at least one inlet for insertion of materials to be pressed or discharge of solid pressing residues, said inlet adapted to be closed by a door, the device comprising:at least one unit for controlled establishment of a leak;each unit being associated with a cooperating inlet and door;each unit including an actuator module comprising an opening for receiving a key mounted on the door under consideration, and an actuating member whose position depends on the presence of the key in said opening;a valve module comprising a sealing member for a circulation duct between a first aperture in fluid connection with one or more inflation volume pressurized when the press is pressurized, and a second aperture opening into the open air;the actuating member allowing the closure of said circulation duct by the sealing member, when the key is present or totally engaged in the opening, and forcing the freeing of said duct when the key is not in said opening or is insufficiently engaged in said opening;the inflation volume corresponding to the volume defined by an inflatable joint mounted on the door intended to close the inlet of the press;a pneumatic sealing module which is controlled by the pressure applied when the inflatable joint of the door of the press is pressurized and whose state is controlled by the unit; said pneumatic sealing module being mounted in the region of the escape duct in direct connection with the volume of the pressurized joint. 13. The safety device according to claim 12, wherein the sealing member is biased into the closure position of the circulation duct by the action of a resilient member and is displaced beyond said closure position by the action of the actuating member. 14. The safety device according to claim 12, wherein the sealing member is in the form of a ball resiliently biased by a compression spring against a seat formed by an annular indent produced in a central portion of the circulation duct, forming in cooperation a reverse-lock valve in the direction of the second aperture; the actuating member comprising a moving lug, which can be displaced in the circulation duct between a retracted position in which said lug is not in contact with or does not rest on said ball, and an opened-out position in which said lug engages said ball to detach it from said seat. 15. The safety device according to claim 13, wherein the operational connection between the key and the actuating member of the actuator module is mechanical, and the valve module is formed from two partially recessed blocks each enclosing a part of the circulation duct, and one of the two apertures opening therefrom, and forming, by assembly, a central portion of said duct, comprising a seat suitable for adjusted reception of the sealing member and a bearing surface for the resilient member. 16. The safety device according to claim 12, wherein the pneumatic sealing module comprises a moving piece which is displaced by the pressure becoming established in an inflation volume when the joint is pressurized in a sealing position in which the moving piece tightly closes the escape duct against a return force biasing said moving piece in a freeing position. 17. The safety device according to claim 16, wherein the moving piece is displaced in or against the escape duct to achieve the tight seal thereof.

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Safety device for a pneumatic membrane press

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Safety device for a pneumatic membrane press

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