Bidirectional braking hydraulic machine and working method thereof

Abstract

The invention discloses a bidirectional braking hydraulic machine and a working method thereof. An oil outlet of an oil tank is connected with the input end of an oil pump; a hydraulic directional valve and a first electromagnetic directional valve are both three-position four-way valves, when the first electromagnetic directional valve is in the middle position, a first oil port and a second oil port of the first electromagnetic directional valve are connected with the hydraulic directional valve, a third oil port of the first electromagnetic directional valve is connected with the oil tank, and a fourth oil port of the first electromagnetic directional valve is connected with the output end of the oil pump; when the hydraulic reversing valve is in the middle position, a first oil port of the hydraulic reversing valve is connected with the oil tank, a second oil port is connected with an oil inlet of an overflow valve, a third oil port is connected with the output end of the oil pump, a fourth oil port is connected with rodless cavities of two hydraulic cylinders, a fifth oil port is divided into two paths, one path is sequentially connected with a throttling valve and rod cavities of the two hydraulic cylinders, the throttling valve is connected with a second electromagnetic reversing valve in parallel, and the other path is connected with an overflow valve; and an oil outlet of the overflow valve is respectively connected with an oil inlet of a third electromagnetic directional valve and the oil tank; and an oil outlet of the third electromagnetic directional valve is connected with the oil tank. Bidirectional pressing forming is achieved, the quality of formed parts and the production efficiency are improved, and the production cost is greatly reduced.

Description

technical field [0001] The invention belongs to the field of hydraulic machines, and relates to a two-way braking hydraulic machine and a working method thereof. Background technique [0002] The powder compression molding process related to hydraulic presses, in which metal powder, ceramic powder and metal-ceramic mixed powder are the most common. The powder pressing molding process belongs to the dry pressing molding process technology. Generally, the powdery raw materials are put into the mold, and then the mechanical force is output by the hydraulic press to press the molding. The most critical thing about the powder compacting process is the hydraulic press. Most of the aging one-way hydraulic presses are used now. The traditional hydraulic press presses the powder in one direction through a single hydraulic cylinder; the one-way pressing scheme will definitely lead to molding parts. The density of the molded parts is not uniform, the density of the molded parts is hig...

AI Technical Summary

Problems solved by technology

The most critical thing about the powder compacting process is the hydraulic press. Most of the aging one-way hydraulic presses are used now. The traditional hydraulic press presses the powder in one direction through a single hydraulic cylinder; the one-way pressing scheme will definitely lead to molding parts. The density of the molded parts is not uniform, the density of the molded parts is high near the pressing rod, and the density is small away from the pressing rod, and the layering is more obvious, especially when pressing ceramic powder, the layering phenomenon caused by this molding method is in the During the firing process of ceramics, faults, cracks, and serious deformations will directly occur in the molded parts, which will lead to the waste of the molded parts, and the consumption of expensive ceramic powder raw materials and some metal powder raw materials is even more expensive. , so it is particularly important to improve the hydraulic press that provides mechanical force

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