Commonly used hydraulic press and screw press two types, and pre-press for the screw press (tea seed pressing machine).

Hydraulic press is the oil pressure, so that the oil in the static pressure of the press. According to the pump power source there are two kinds of manual and electric; according to the way to put pressure on the billet can be divided into vertical and horizontal. Vertical hydraulic press base fixed on a base cylinder, the cylinder is equipped with cylindrical piston, the upper part of the piston and the cake into a whole dish. The billet is pre-pressed into a round cake, and the outer jacket is wrapped between 20 and 40 rounds of cake and between the top and the top of the cake. The cake and the cake are separated by a thin plate with holes to drive the top of the piston, Produce pressure, squeeze the cake out of oil. After pressing the pump to stop the pressure, the piston down, the slag unloaded, re-loaded with cake, so repeated intermittent oil, each pressing about 2 to 5 hours.

In the use of electric oil pump can be composed of circulating oil system, while operating several hydraulic press operation. Horizontal hydraulic press structure and working principle and vertical basically the same, the equipment is easy to install, smooth flow of oil, oil cake circle is not oil; but covers an area of large, need to be used with the back of heavy hammer, pulley Or screw mechanism. Hydraulic press pressure, a high oil rate, less moving parts, easy maintenance; but the loading and unloading of labor intensity is also larger.

The screw press is a machine in which the blank is continuously advanced in the press chamber and the crude oil is squeezed under dynamic squeezing. In addition to the hopper, the press chamber is the main part of the operation, by a squeeze screw and cylinder squeeze cage composition. There are two types of single-stage press and two-stage press, single-stage only one horizontal press chamber, two-stage plus a straight press to carry out the first level press. The squeeze shaft consists of a number of crimps and loops on the shaft. Each screw has a certain pitch and screw depth, and a shaft on the pitch of the screw from the feed to the discharge port gradually shortened, the screw gradually become shallow, so that the volume of the press from the import to the export gradually To reduce the billet into the press after the squeeze screw thread level to the exit, the pressure gradually increased, so the oil will be squeezed out. Cylindrical squeeze crates and squeeze the installation of gasket to form a gap between the oil, squeezed out of the oil that is through the gap.

The large squeegee press is also equipped with scraper, scraper deep in the press chamber, aimed at each circle, to prevent the blank in the press chamber sliding, and to prevent the billet, and to adjust the cake thickness, Thereby correspondingly controlling the pressure of the press chamber and reducing the residual oil rate. In addition, the machine also has a smooth surface of the cake cake, etc., and often accompanied by steamed wok, can make the oil steaming and pressing continuous.

The press is used as a pre-press of the press machine is a large pressure to the oil pre-press, the pre-press the billet into the press after the press or continue to use the leaching method to take oil. So its import and export of the press volume of the larger changes in the volume, production capacity is also larger.

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