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An apparatus for sealing a vacuum chamber having a plurality of long cylinders for linearly moving first piston rods. The first piston rods connect with a frame elevator. The frame elevator has a second piston rod and guide stems parallel to the first piston rods. A lever, a transmitting rod and a c

An apparatus for sealing a vacuum chamber having a plurality of long cylinders for linearly moving first piston rods. The first piston rods connect with a frame elevator. The frame elevator has a second piston rod and guide stems parallel to the first piston rods. A lever, a transmitting rod and a connecting rod are synchronously moved, when the second piston rod is moved parallel to the guide stems by a short stroke cylinder. The transmitting rod is pivoted with a middle of the connecting rod. Direction-changing mechanisms are pivoted at the two ends of the connecting rod for horizontally moving a door to seal the vacuum chamber. The moving direction of the door pushed by the direction-changing mechanisms is perpendicular to the moving direction of the second piston rod so that the apparatus has a thin configuration.

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1. An apparatus for sealing a vacuum chamber comprising:a frame elevator connected to first ends of a plurality of guide stems;a plurality of first stroke cylinders having a plurality of first piston rods connected to the frame elevator for linearly moving the frame elevator;a support frame fixedly

1. An apparatus for sealing a vacuum chamber comprising:a frame elevator connected to first ends of a plurality of guide stems;a plurality of first stroke cylinders having a plurality of first piston rods connected to the frame elevator for linearly moving the frame elevator;a support frame fixedly connected to second ends of the guide stems and pivotally connected with a plurality of levers;at least one second stroke cylinder mounted in the frame elevator, the second stroke cylinder having a second piston rod that moves parallel to the guide stems, the first piston rods passing into the support frame to control the plurality of levers,a connecting rod movably located within the support frame;a transmitting rod connecting the plurality of levers and a middle of the connecting rod;a plurality of direction-changing mechanisms pivotally connected to opposing ends of the connecting rod; anda door pivotally connected to the direction-changing mechanisms;such that, when the second piston rod of the second stroke cylinder moves the plurality of levers, the transmitting rod and the connecting rod, the door is moved linearly in a direction perpendicular to a longitudinal axis of piston rod. 2. The apparatus according to claim 1, wherein each direction-changing mechanism comprises a sliding block, a support block and a mounting block, the mounting bocks are connected with the door, a first end of each of the sliding blocks is pivotally connected to the connecting rod by a respective pivot element, each of the pivot axis, the pivot elements passing through a corresponding narrow opening of the support frame, a support block second end of each of the sliding blocks is pivot connected to a respective one of the mounting blocks, and each support block ispivotally connected to a middle of a respective one of the sliding blocks and the support frame. 3. The apparatus according to claim 1, wherein the support frame includes a fixed across bar supporting the plurality of levers. 4. The apparatus according to claim 1, further comprising a ring cushion located on the door. 5. The apparatus according to claim 1, further comprising an additional second piston rod and an additional transmitting rod, the additional transmitting rod is pivotally connected between an additional connecting rod and the plurality of levers, the additional transmitting rod is pivotally connected to a middle of the additional connecting rod. 6. An apparatus for sealing a vacuum chamber comprising:a flat shell having an opening;a door movably located in the flat shell;a plurality of direction-changing mechanisms located on the door;an elevating mechanism located on the flat shell for moving the door, the elevating mechanism comprising a plurality of first stroke cylinders having a plurality of first rods; anda sealing mechanism controlling the direction-changing mechanism to seal the door in the opening, the sealing mechanism comprising a frame elevator, a support frame, a guide stem and a second stroke cylinder, the guide stem fixedly connecting with the frame elevator and the support frame, the second stroke cylinder mounted in the frame elevator, the second stroke cylinder having a second piston rod that moves parallel to the first rods and; the shell has a guide plate fixedly mounted there to, the guide stem and the second piston rod are inserted through the guide plate. 7. The apparatus according to claim 6, wherein each direction-changing mechanism includes a sliding block, a support block and a mounting block, the sealing mechanism includes a connecting each of the mounting blocks is mounted on the door, a first end of each of the sliding blocks is pivotally connected to the connecting rod by a respective pivot element, a second end of each of the sliding blocks is pivotally connected to a respective one of the mounting blocks, each support block is pivotally connected to a middle of a respective one of the slide blocks and the support frame. 8. The apparatus accordi ng to claim 7, wherein the support frame has a plurality of narrow openings to provide moving spaces for the pivot elements. 9. The apparatus according to claim 6, wherein the support frame includes a fixed across bar. 10. The apparatus according to claim 6, further comprising a ring cushion on the door. 11. The apparatus according to claim 6, wherein the sealing mechanism includes a lever and two transmitting rods, one of the two transmitting rods is pivotally connected between the lever and a middle of the connecting rod.