RU1827357C - Drive of hydraulic press for cutting parts from nonmetal materials - Google Patents

Abstract

Usage: the invention relates to presses for the shoe and leather goods industry with a hydraulic drive. SUBSTANCE: press containing a movable crosshead, working and return cylinders, a main pump hydraulically connected through a distributor with an accelerator and through sequence valves to working cylinders, and a control pump connected through a check valve to the return cylinders, and the main pump through the control valve and the sequence valves are connected to the working cylinders, the supply of one sequence valve being connected to the branch of the other, and the working cylinders connected to the shut-off valve with accelerator. The design of the drive has increased reliability and low energy costs. 1 ill.

Description

The invention relates to hydraulic presses for the shoe and leather goods industry, and can also be used for other hydraulic presses.

The purpose of the invention is to increase reliability and reduce energy costs.

The drawing shows a drive circuit of a hydraulic press for cutting parts of non-metallic materials.

The drive contains a main pump 1 with a safety valve 2, connected through a distributor 3 and a pressure hydraulic valve with a check valve 4 to the return cylinders 5, forcing a cavity 6, the accelerator 7 and through the valves of sequences 8 and 9 with working cylinders 10

The control pump 11 with the safety valve 12 through the filter 13 is connected with the control of the distributor 3 and through the check valve 14 with the return cylinders 5.

The working cylinders 10 are connected through a shut-off valve 15 to the working cavity 16 of the accelerator 7.

In the initial position, when the main pump 1 is turned on, the working fluid is supplied to the safety valve 2 and is discharged through the distributor 3. From the control pump 11, liquid is supplied to the safety valve 12, the distributor 5 and through the check valve 14 to the return cylinders 5.

When the left electromagnet of the distributor 3 is turned on, the working fluid from the pump 1 is supplied to the boost cavity 6 of the accelerator 7. From the working cavity 15

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the bone through the shut-off valve 15 is expelled into the working cylinders 10. From the return cylinders 5, the working fluid through the pressure hydraulic valve with check valve 4 and the distributor 3 enters the drain. There is an accelerated traverse 17 down.

When the traverse 17 of the working body (torch) reaches the pressure in the pressure line of the main pump 1 - distributor 3 - boosting cavity 6 of the accelerator 7, the valve of sequence 8, adjusted to a pressure of 4-6 MPa, opens, and the shut-off valve 15, adjusted to a pressure of 2- 2.5 MPa, disconnects the working cavity 16 of the accelerator 7 from the working cylinders 10 and the liquid from the pump 1 through the distributor 3, the valve of the sequence 8 is fed into the working cylinders 10. A working stroke occurs with maximum force.

After the end of the technological process, the left and right solenoid valves of the distributor 3 are turned off, as a result of which the separator 3 is switched and the working fluid through the pressure hydraulic valve with check valve 4 enters the return cylinders 5. From the working cylinders 10, the liquid is supplied through the shut-off valve 15 the working cavity 16 of the accelerator 7, thereby moving the movable piston 18 to the lower (according to the scheme) position, and the excess liquid through the valve of the sequence 9, adjusted to a pressure of 1.0 ... 1.5 MPa, and the distribution Lite 3 is fed to the drain.

At the end of the return stroke, all devices are set to their original position.

The increase in reliability is ensured by the complete filling of leaks in the working cavity 16 of the accelerator 7 and the guaranteed lowering of the movable piston 18.

The reduction in energy costs is due to a decrease in pressure in the hydraulic system during the fast downstroke and the stroke.

Claims (1)

The claims A hydraulic press drive for cutting parts from non-metallic materials, containing working and return cylinders, a pump with a drain tank and a control system including an accelerator with control cavity and discharge cavity associated with working cylinders, distributor with control pilot, pressure valve with check valve mounted on the line between the distributor and the return cylinder, controls installed on the line connecting the distributor to the accelerator discharge cavity, and the control pump connected with a pilot of the distributor and by means of a check valve with a cavity of the return cylinders, characterized in that, in order to increase reliability and reduce energy costs, the control means installed on the line connecting the distributor to the accelerator cavity are made in the form of two check valves with check valves installed in parallel, while the inlet of one valve is connected to the outlet of the other, as well as the shut-off valve that is connected behind the valves accelerator wheel. w