Hydraulic press for fiber-reinforced plastic (FRP) product

A hydraulic press for a fiber-reinforced plastic (FRP) product, comprising a workbench, wherein four corners of the workbench are provided with uprights;

• the uprights are arranged in two rows front and rear, and tops of the uprights in each row are connected by an upper beam extending in a left-right direction;
• tie rods are inserted in the front and rear of each upright;
• the tie rods each have an upper end and a lower end, wherein the upper end protrudes from a top of the upper beam and is fixed to the upper beam by an upper nut, and the lower end protrudes from a bottom of the workbench and is fixed to the workbench by a lower nut;
• a central cylinder is provided at a center of the upper beam;
• side cylinders are symmetrically arranged on a left and a right of the central cylinder;
• lower ends of plungers of the central cylinder and the side cylinders are fixedly connected to a top of a slider;
• a return cylinder and a mold opening cylinder are arranged between the uprights on a same side;
• the return cylinders on the left and right are distributed diagonally, and the mold opening cylinders on the left and right are also distributed diagonally;
• and the central cylinder and the side cylinders are each connected to an oil tank through a filling valve.