SU1498979A1 - Speed control system for actuator - Google Patents

Abstract

The invention relates to hydraulics and can be used to control the speed of the actuator. The purpose of the invention is to improve the accuracy of controlling the speed of a hydraulic motor. This is achieved by the fact that in the speed control system of the hydraulic motor 3 containing the power source 1, the flow controller 4, two hydraulic machines 11 and 13, the shafts 15 of which are kinematically connected to each other, the spring-loaded hydraulically controlled valve 7 and the speed regulator 14, the controller 4 consumption made giroupravlyam. Control cavities 5 and 6 are connected to power supply 8 and drain lines 9. Distributor control cavity 12 communicates with working cavity 10 of hydraulic motor 3 and through hydraulic gear 11 with drain lines 9. Hydraulic machine 13 is connected to power supply 8 and through controller 14 speeds to the drainage line 9. This embodiment of the control system allows you to set different speeds of the working feed of the hydraulic motor 3, which is kept constant regardless of external load fluctuations. 1 hp f-ly, 1 ill.

Description

The invention relates to hydraulics, mainly to hydraulic systems of press-forging equipment, and can be used to control the speed of an actuating hydraulic motor.

The purpose of the invention is to improve the accuracy of controlling the speed of a hydraulic motor.

The drawing is a schematic diagram of a hydraulic engine speed control system.

The control system contains a power source 1 supplying the working fluid to the working cavity 2 of the hydraulic motor; 3 through regulator 4, which is made hydraulically controlled. The cavities 5 and 6 of the control of the regulator 4 are connected via a hydro-controlled spring-loaded distributor 7 with an additional power supply 8 and the drain hydroline 9.

The second working cavity 10 hydrodvigage 3 is connected to the drain hydroline; 1 and 9 through the hydromachine 11 with the cavity

12

eight

l 1 1

by myself.

The control system works as follows.

u

The required speed of the hydraulic motor 3 is set by the speed regulator 14, which determines the frequency of rotation of the hydromachine 13 and, accordingly, of the hydraulic machine 11. At a certain steady speed of the hydraulic / 1gatel 3, the distributor 7 is

neutral position. When setting re | A motor 14 with a higher frequency of rotation of the hydraulic machine 13 decreases the pressure in the FULL cavity 10 of the hydraulic engine 3, as a result of which the valve 7 moves

first (according to the drawing) position, working

F

5 | communicates with drain hydroline 9, the opening of the flow regulator 4 | is the most possible, the pressure in the working cavity 10 increases; until the distribution of the gel 7 is returned to neutral

the control of the distributor 7. The source of the Tani source is connected to the drain hydroline through the second hydraulic machine 13 and the speed regulator 14. The shafts of 15 hydraulic machines and 13 are kinematically connected between

| dkost. FROM SOURCE 8 INPUTS TO PORTURE 6 CONTROLLERS OF REGULATOR 4, AND CAVITY

a position corresponding to the newly established speed of movement of the hydraulic motor 3. In a similar way, the system operates when the regulator 14 sets a lower speed.

The high speed drive motor 3 can be carried out either by using an additional reversing distributor (NOT shown) or by disconnecting the power supply 8.

Thus, the proposed control system allows you to set different speeds of the working feed of the actuating hydraulic motor 3, which is kept constant regardless of fluctuations in the external load, volumetric efficiency of the system and other factors.

Claims (2)

1. Hydraulic motor speed control system containing a power source, a working fluid flow regulator through which one of the hydraulic motor working cavities communicates with a power source, a comparator device made in the form of two hydraulic masks, which shafts are kinematically connected to each other, a hydraulically controlled spring-loaded distributor and a speed regulator, wherein the second working cavity of the hydraulic engine communicates with the drain hydroline through one of the hydraulic masks, characterized in that, in order to increase the accuracy of the control The speed control of the hydraulic motor, the working fluid flow regulator are made hydraulically controlled, the control cavities of which are connected to the power source and the drain hydroline through the hydraulically controlled spring-loaded distributor, the control valve of the distributor communicates with the second working cavity of the hydraulic motor, and the second hydraulic gap is connected to the power source and through the regulator speed to drain line. 2. The system according to claim 1, characterized in that it is provided with an additional power source to which the second hydraulic fluid is connected.