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[CN 201720791882.7] Title of a portal hydraulic press: Application number of a portal hydraulic press: CN 201720791882.7 Applicant: Jiangsu Guoli Forging Machine Tool Co., Ltd. Application Date: 2017-7-3 Patent Type: Utility Model The utility model relates to a portal hydraulic press. The left and right sides of the portal body are respectively provided with upright columns, the upper parts of the left and right upright columns are provided with upper beams, the lower parts of the left and right upright columns are provided with workbenches, and a main cylinder are installed in the central holes, the lower end of the master cylinder piston is connected with the slider; the master cylinder piston is inserted into the inner cavity of the master cylinder body. The top of the master cylinder body is respectively provided with a master cylinder upper cavity oil port and a master cylinder filling interface. The lower circumference of the master cylinder body is provided with a master cylinder lower cavity oil port, and a master cylinder piston extending from top to bottom is arranged along the axis of the master cylinder piston, and a small oil cylinder is inserted into the center hole, the upper part of the small cylinder extends from the center hole of the top wall of the master cylinder body and is fixed on the master cylinder body through the small cylinder lock nut. The small cylinder and the master cylinder body and the center hole of the master cylinder piston are respectively sealed by seals. Sealing is realized, and a through small cylinder center hole is provided along the axis of the small cylinder. The sliding block of the portal hydraulic press is fast, and the machine tool has high operating efficiency.
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