SU1270030A1 - Hydraulic press control systems - Google Patents

Abstract

The invention relates to the field of mechanical engineering, namely to press control systems. The purpose of the invention is an increase in technological capabilities and an increase in productivity due to the installation of a two-way valve connected to its control cavities through a hydraulic lock, a check valve and an adjustable choke with the piston cavity of the power cylinder. The return stroke is made when the pilot electromagnet is turned on. 2 Il. with S (L with

Description

Yu

I

The invention relates to the machine

structure, namely, press control systems

The purpose of the invention is to expand the technological capabilities of the press and increase its productivity by reducing dynamic loads and reducing the time of auxiliary operations.

Fig. 1 is a control system diagram; in fig. 2 - dependence of technological effort Р and movements of the slider S on time.

The control system contains a power cylinder 1 fixed on the base 2 of the press. Piston 3 and rod 4 of the cylinder cavity are connected by pipelines 5 and 6 through the main valve 7 to the pump 8 and drain line 9. The control of the cavity 10 and 11 of the compressor 7 is communicated by pipelines 12 and 13 to the pilot pilot 14, equipped with electromagnets 15 and 16. Pilot 14 inlet is connected to pump 8 by pipeline I7. At the exit of pilot I4, in series with it, there is an on-off valve 18. With control cavities 19 and 20. Cavity 19 is connected through a hydraulic lock 21 by pipe 22 to a cavity 3 cylinders Cavity 20 by pipe 23 through the check valve 24 and the adjustable throttle 25 are connected to the cavity 3. On the side of the cavity 20, a spring 26 is installed, holding the spool of the distributor 18 in the initial position .. The stop valve 27 is designed to operate the distributor 18. On the base 2 of the press, the die 28 is installed , and on the slider 30 fixed punch 3I,

The control system works in the following way.

When turning on the electromagnet 15 of the pilot 14, the liquid of the pump 8 through the pipeline 17 through the pilot 14 and the distributor 18 flows through the pipeline 12 into the cavity 10 of the distributor 7, and the liquid from the cavity 11 enters the drain. The distributor 7 switches and informs the pump 8 with the cavity 3 of the cylinder 1, and the cavity 4 with the drain. The slider 30 of the press is lowered. At the same time, the fluid through the open shut-off valve 27 flows through the hydraulic lock 21 through the pipeline 22 into the cavity 19 of the distributor 18, and through

1270030

and choke 25 by

check valve 24

pipe 23 into the cavity 20. From the moment the punch 31 is introduced into the workpiece 29, the pressure increases in

the cavities 3 of cylinder I and in the cavities 19 and 20 of the distributor 18. The pressures in the cavities 19 and 20 remain equal and the valve of the distributor 18 is held by the spring 26 in the original

lying. After the maximum technological load (point a) is observed, the resistance of the workpiece falls smoothly to the point b - the beginning of cleavage of the material.

a sharp drop in the technological load and an increase in the speed of movement of the slide (section rd),

The pressure in the cavity 3 of the cylinder changes in a similar way to changing techno

logical load. The pressure in the cavity 20 of the distributor 18 begins to decrease simultaneously with a decrease in pressure in the cavity 3 of the cylinder 1, the rate of decrease in pressure in the cavity 20

for example, the adjustment of the adjustable throttle 25. The pressure in the control cavity 19 is kept equal to the maximum in cycle due to the presence of a hydraulic lock 21, and at a certain

the pressure drop in the cavity 19 and 20, the valve 18 is switched.

After switching the distributor 18 through the pilot 14 and the distributor 18 through the pipeline 13

steps into the control valve cavity 11 of the distributor 7 and is drained from the cavity 10, whereby the valve

7Switches: fluid from pump

8 enters through the pipeline 6 into the cavity 4 of the cylinder 1. The slide 30 presses

rises. When the upper position of the slider is reached, the electromagnet 15 is switched off and the hydraulic lock 21 and the system open for a while

the control returns to its original position. If a return stroke is required for the slide 30, the shut-off valve 27 is closed at the limit switch. Returnable

the turn is made when the electromagnet 16 pilot 14 is turned on

The economic effect of the implementation is achieved by expanding technological capabilities and increasing

Performance performance

Claims (1)

The invention The hydraulic press control system comprising a pump connected to a piston and rod of a power cylinder through a main distributor with two control cavities, as well as a hydraulic lock and connected with its entrance to the control line of a pilot with two outputs, that, in order to expand the technological capabilities of the press and increase its productivity by reducing dynamic loads and reducing the time of auxiliary operations, it is equipped with a two-position a distributor with two control cavities, a check valve and an adjustable throttle installed parallel to it; the control cavities of the main distributor are connected to the pilot's outlets through a two-position distributor, and the piston cavity of the power cylinder is connected to one of the control valves cavities of the two-position distributor through a hydraulic lock and from the second through a check valve and an adjustable choke.