According to the different leakage mechanism, there are leaks, porous leakage, adhesive leakage and dynamic leakage and other forms, a variety of leakage forms of leakage can be used in hydraulic fluid dynamics of the orifice, the gap flow formula to calculate. Leakage is an important issue that affects and restricts the application, reputation and development of hydraulic technology. Because the leakage not only wastes the hydraulic medium, pollutes the environment, moreover can reduce the system volumetric efficiency, affects the hydraulic system the normal work.

Four-column hydraulic press hydraulic press system depends to a large extent on the hydraulic system design and sealing the choice of seals, the design of the sealing structure selection is unreasonable, the selection of seals is not standardized, the design does not take into account the hydraulic Oil and sealing materials compatible type, load conditions, limit pressure, the size of the working speed, ambient temperature changes. These are in varying degrees, directly or indirectly caused by hydraulic system leakage. In addition, the use of construction machinery with dust and impurities in the environment, so the design should use the appropriate dust seal to prevent dust and other dirt into the system to destroy the seal, pollution of the oil, resulting in leakage.

Hydraulic press is a special hydraulic oil as the working medium, through the hydraulic pump as the power source, by the pump force to make hydraulic oil through the hydraulic pipe into the cylinder / piston and then cylinder / piston with a group of work with each other seal (So that the hydraulic oil can not be leaked) will be converted into mechanical energy hydraulic oil, hydraulic press mainly by the implementation of the principle of hydraulic drive, hydraulic transmission is the use of liquid pressure to transmit power and control of a transmission mode of principle and thus into oil Pressure machinery and equipment, hydraulic press referred to as the medium of liquid by the hydraulic machinery and equipment in the industry called the hydraulic machinery, the mainland provinces known as the hydraulic machine, hydraulic machine popular call this.

So why four-column hydraulic machine with hydraulic pad it? In order to improve the success rate of the stretching process, widen the scope of application of the stretching process and simplify the structure of the sheet stamping die, a new type of hydraulic press is developed. The four-poster hydraulic press adds a slanting hydraulic press Of the hydraulic pad.The structure of the hydraulic machine will be ejected, blanking, pull down function integrated in an upper hydraulic pad, with the use of the next under the hydraulic pad to improve the quality of the tensile parts to reduce the rejection rate.

Four-column hydraulic machine pipe often use threaded connection, flange connection and pipe joints to connect the three connections. Flange connection is generally used for the larger diameter of the oil wisdom, the flange and tubing first welded together, and then use the seal and bolts will be docked France Yang Yang tight, a bear machine hydraulic system, the application of this connection method is not many. In the pipeline directly set thread and component connection method is simple, but the assembly and dismantling key 1 is not convenient, easy to stress concentration and produce cracks, bear vibration ability, sealing effect is also poor, rarely used in hydraulic transmission. Sometimes in order to reduce the resistance of the oil absorption channel, simplify the structure, using this method to access the suction pipe.

Hydraulic transmission pipeline is the most commonly used method is to connect the connection method, is the use of various types of pipe fittings and components of the pipeline and pipeline and pipeline valve connected. This connection method is simple, easy assembly and disassembly, suitable for standardization and serialization, a wide range of applications.