A hydraulic pump for a press

Abstract

The invention discloses a press-machine hydraulic pump. The press-machine hydraulic pump comprises a cover plate, a hydraulic cylinder and a base, and a pump boy and an air pump are arranged below the base. The press-machine hydraulic pump is characterized in that the cover plate is embedded and welded at the edge of an opening in the top of the hydraulic cylinder, an air discharging device is installed on the cover plate, the base is provided with an oil returning valve and an oil discharging hole, and a limiting device is arranged on the side, close to the oil returning valve, on the base; a pair of oil holes are formed in the face, connected with the hydraulic cylinder, of the base, one oil hole of the pair of oil holes is communicated with the pump body, the other oil hole is communicated with the air pump, and a filtering net is riveted and embedded on the oil holes. The structure is stable, the using quantity of fastening pieces and the using quantity of sealing pieces are decreased, leakage of hydraulic oil is avoided, and the service life is prolonged; the connecting stability and convenience of disassembling and assembling of the filtering net can be improved; the oil returning rate of hydraulic oil is accurately controlled, and redundant air is released in time; the operating time is shortened to improve the working efficiency. It can be avoided that due to excessive rotation, a screw of the oil returning valve falls off from the base in the rapid adjusting process, and the using safety is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of pressure machinery, and in particular relates to a hydraulic pump of a pressure machine. Background technique [0002] The press is a general-purpose machine with a wide range of applications. It can be used for cutting, punching, blanking, bending, riveting and forming in production. It can be used for repairing and orthopedic metal objects in daily life. . Among the presses, the small hydraulic press is one of the most commonly used models, which is usually composed of hydraulic pumps, racks, stamping devices and other components, wherein the hydraulic pump is an important component for providing power. At present, the common press hydraulic pumps on the market generally have the disadvantages of large volume and the inability to accurately control the pressure, especially during the working process, when the pressure of the hydraulic pump is obviously insufficient, the assembly and correction of the w...

AI Technical Summary

Problems solved by technology

At present, the common press hydraulic pumps on the market generally have the disadvantages of large volume and the inability to accurately control the pressure, especially during the working process, when the pressure of the hydraulic pump is obviously insufficient, the assembly and correction of the workpiece cannot be completed, and vice versa. Excessive pressure can easily cause excessive damage to the workpiece; in addition, the oil return valve used on the existing hydraulic pump is generally a common handle structure, and the pressure mechanism of the hydraulic pump usually needs to open the oil return valve when it is reset. The hydraulic oil in the press-down mechanism flows back into the hydraulic pump. However, when the oil return valve is adjusted quickly, the handle of the oil return valve may occasionally cause the screw to fall off due to excessive rotation, which not only affects the adjustment speed of the oil return valve, Moreover, it causes hydraulic oil leakage, which makes the hydraulic pump a potential safety hazard.

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