SU375208A1 - HYDRAULIC PRESS DRIVE - Google Patents

Description

one

This invention relates to the field of metal forming.

A hydraulic press drive is known, which contains a battery and an additional tank, connected by pipelines through a distribution equipment to a press working cylinder, which is in turn connected to a high-pressure supply line.

In order to reduce the drive power and decrease the bar-bar in the proposed drive, the high pressure source is connected by an additional pipe to the battery, and in the additional pipe and line connecting the high pressure source to the working cylinder of the press, two controlled, alternately activated valves are installed. For | increase efficiency and durability of the drive is also provided with an additional line connecting the working cylinder with the battery, with a valve installed in it and a successively controlled valve and a check valve that allows liquid only in the direction from the cylinder to the battery.

The drawing shows a diagram of the proposed drive press.

The battery consists of section 1, which is a pump-accumulator

station, at a pressure of 320 kg / cm and section 2 at a pressure of 600 kg / cm.

At the beginning of the working stroke, liquid is pumped into the working cylinder at a pressure of 320 kg / cm 5 from a section / through a minimum level valve 3, a pressure valve 4 and a filling valve 5. Then, through the minimum level valve 6 and the pressure valve 7, fluid is supplied to the working cylinder from section 2 under

0 pressure of 600 kg / cm. In this case, the valve actuator 7 is selected from the condition that the valve can be opened only when after it (via the check valve 8) and in the working cylinder the pressure reaches the value close to

5 to 320 kg / cm. The pressure level of 320 kg / cm is maintained at the same time by the Check Valve 9. The pump 10 develops a pressure of 1000 kg / cm and is put into operation when the pressure in the working cylinder reaches

0 600 kg / cm. The pressure level of 600 kg / cm is maintained while the check valves 1L. Before the return stroke begins, the pressure in the range of 1000-600 kg / cm is released into section 2 through valve 12, in the range of 600-

5 320 kg / cm to section 1 through Valve 13, and pressure from 320 kg / cm and below through valve 14 to the filling system or to the feed tank of the station. The drain valve actuators are selected so that the valve 13 opens only at cylinder pressure.

not higher than 600 kg / cm, and valve 14 at a pressure not higher than 320 kg / cm. The check valves 15 and 16 prevent the high pressure liquid from getting into the working cylinder during idling.

A pump 10 is used to fill the battery section 2 with liquid after the end of the working stroke. The valve 17 opens and the valve 18 connecting the pump to the working cylinder closes. ,

Subject invention

Claims (2)

1. A hydraulic press drive containing ak; a kuk: a multiplier and a filling tank connected by means of a distributor to a press working cylinder connected in turn with a high pressure source, characterized in that, in order to reduce the drive power and size reduction, the high pressure source is connected by an additional pipeline to the battery, and in the additional pipeline and in the line connecting the high pressure source to the working cylinder of the press, There are two alternating valves. 2. The drive of the hydraulic press according to claim 1, characterized in that, in order to increase the efficiency and durability, it is equipped with an additional line connecting the working cylinder with a battery with installed in it a sequentially controlled valve and a check valve that allows liquid to pass through only from the cylinder to the battery.