SU451546A1 - Hydraulic Press Control System - Google Patents

Description

(54) HYDRAULIC PRESS MANAGEMENT SYSTEM

one

This invention relates to the field of metal forming. ,

Control systems for hydraulic presses are known, including a servomotor with a cam shaft interacting with the main and return cylinder distributors, manual control, a filling valve and a filler.

In order to increase productivity and improve working conditions, the proposed system is equipped with a hydraulic braking device built in the main between return cylinders and their distribution; 1 body with a hydraulic valve of control and an electromagnet of control valve connected in parallel with a floating valve. Associated with the position sensor of the movable traverse of the press through an adjustable time reset built into the control system

Fla drawing shows the scheme of the proposed system.

The hydraulic press uravle system consists of a servo motor 1, which is permanently engaged with the camshaft 2 of the distributor 3, the main cylinder 4, the distributor 5, the return cylinders 6, manual control 7, naprapletnoy klapya 8,: fill the 9 and hydraulic brake device 10 .

The master cylinder 4 and the return cylinders 6 are rigidly connected to the movable head plate 11 of the hydraulic press. Manual up-

Direction 7 is connected to the distributor 12 of the servomotor 1. The cams of the shaft 2 are connected to the valves of the distributors 5 and 3 of the return and main cylinders and the distributor 13 of the hydraulic cylinder.

filling valve 8. In the hydraulic line of the return cylinders between the distributor of 5 return cylinders 1Г1шпиндраЙ1Г in a anovoli hydraulic brake device 1О, consisting of

valve 14 of a floating pump with electro-hydraulic valve 15 for controlling and shutting down parallel to the floating valve of dross / w 16. Electromagnet electro-hydraulic. 1X) valve 15 control is associated with.

17 poop contactless sensor

vizhny traverses. On the movable traverse mounted bracket 18 with flags 19 and 2O. In the electrical circuit of the sensor 17 is installed time relay (in the drawing

not shown) ..

The control system works as follows.

in a way.

When the hand control knob 7 is moved, the pressure through the distributor 12 is supplied to the servomotor 1, which turns the shaft 2. Using the cams located on the shaft 2, actuate the valves of the distributor 5 of the return cylinders, and high pressure from the UAS is supplied to the braking device 1O. Under the pressure of the liquid, the floating valve 14 rises, the liquid through the valve and the adjustable throttle 16 enters the rod spaces of the return cylinders 6 and re-raises the yoke 11 upwards. At the same time, valves of valves 3 and 13 are actuated by means of corresponding cams, ensuring that the working fluid escapes from the main cylinder 4 to the filler 9. When the sensor 20 combines with sensor 17, the signal of the latter is applied to the electro-electromagnet valve 15 of the control of the floating valve 14, which closes , and the liquid from the US comes only through the choke 16, thus providing a nonstop shockless approach to the crosshead. The time of the sensor signal is controlled by the time relay. . 17, i.e., the deceleration time, after which the electromagnet of the valve 15 is de-energized, and the floating valve 14 opens,,

When the manual control handle 7 is moved in the opposite direction, the pressure through the distributor 12 is retracted from the servomotor 1, and the latter turns the shaft 2 in the opposite direction. With the help of the cams on the shaft 2, the return cylinder distributor connects the latter with the filler 9. Simultaneously through the distributors 3 and 13 as well as filler4

The liquid valve 8, the working fluid from the napolel, is fed into the master cylinder 4, with the result that the yoke 11 is lowered. At the same time, the working fluid from the returnable cylinders is forced into the filler 9 through the brake device 10. Last npvi works in a similar way. Under the pressure of the liquid, the floating valve 14 rises, and the liquid through the throttle 16 and the valve 14 flows to the distributor 5 and then to the filler 9. When the combining flag 19 and the sensor 17 signals the last signal to the brake device 1O, the valve 14 closes and the liquid passes through the throttle 16, whose setting determines the speed at which the crosshead touches the workpiece.

The duration of braking is regulated in the same way. as when lifting a traverse using a time relay.

Subject invention

A hydraulic press control system containing a servomotor with a camshaft interacting with the main and return cylinder distributors, a filling valve and a filler, characterized in that, in order to increase the productivity and improve the working conditions, it is equipped with return cylinders and their distributor hydraulic brake device; in the form of a floating valve with an electrohydraulic control valve and an adjustable throttle connected parallel to the floating valve, while the solenoid of the control valve is connected to the position sensor of the movable traverse of the press

through an adjustable time relay integrated into the control system.