SU880623A1

SU880623A1 - Throttle control valve

Info

Publication number: SU880623A1
Application number: SU772544295A
Authority: SU
Inventors: Александр Абрамович Крейцер; Галина Борисовна Дятленко; Юрий Александрович Гликштерн; Николай Викторович Навроцкий
Original assignee: Научно-Исследовательский Институт Специальных Способов Литья
Priority date: 1977-11-18
Filing date: 1977-11-18
Publication date: 1981-11-15

Description

(54) ДРОССЕЛЬНЫЙ ЗОЛОТНИК(54) THROTTLE WINTER

II

Изобретение относитс к литейному производству и может быть использовано в машинах лить под давлением.The invention relates to foundry and can be used in injection molding machines.

Известен дроссельный золотник дл разгона прессующего, поршн машин лить под давлением, обеспечивающий в период разгона закон движени , исключающий турбулентный режим заполнени камеры металлом , и существенно упрощающий регулировку масштаба закона движени , в зависимости от металлоемкости формы и режима впрыска. Этот золотник содержит гильзу, jg установленную в корпусе и имеющук) на внутренней и наружной поверхност х кольцевые полости, которые соединены соответственно с подводным и отводным каналами корпуса, цилиндрический плунжер, размещенный в гильзе и имеющий выполнен- s ный в поперечном направлении канала пр моугольного сечени . В гильзе выполнены пр моугольные окна, расположенные диаметрально противоположно; причем кромки канала и пр моугольных окон образуют дроссельные щели. Дл регулировани попереч- Я ных размеров дроссельных щелей золотник снабжен фиксатором, св занным с цилиндрическим плунжером со стороны пружины, иA throttle valve for accelerating a pressurized piston of a machine is known to be cast under pressure, which provides the law of motion during the acceleration period, eliminating the turbulent mode of filling the chamber with metal, and greatly simplifying the adjustment of the scale of the law of motion, depending on the metal intensity of the mold and the injection mode. This spool contains a sleeve, jg installed in the housing and has) on the inner and outer surfaces annular cavities, which are connected respectively to the underwater and outlet channels of the housing, a cylindrical plunger placed in the sleeve and having a rectangular section in the transverse direction . The sleeve is made of rectangular windows located diametrically opposite; the edges of the channel and rectangular windows form throttle slots. To regulate the transverse throttle slit sizes, the spool is provided with a retainer associated with a cylindrical plunger on the spring side, and

т гой обратной св зи дл корректировки характеристик разгона плунжера 1.second feedback to adjust plunger acceleration performance 1.

Перемещение плунжера в осевом направлении измен ет по закону, задаваемому его приводом, сопротивление дроссельной щели между кромками канала в плунжере и Окон в гильзе, т. е. измен ет по заданной программе закон расхода рабочей жидкости через золотник. Конечное сопротивление дроссельной щели определ етс металлоемкостью формы и режимом впрыска, но форма щели в зависимости от соотношени ее.длины и ширины может быть различной.; Так как сопротивление дроссельной щели мен етс за счет изменени ее длины (ширина остаетс посто нной), то чем длиннее, а значит и уже, щель, тем точнее воспроизводитс Заданна программа изменени расхода через золотник. Однако узка щель снижает чувствительность золотника к корректировкам , вводимым обратной св зью, так как врем изменени сопротивлени щели при малом ее поперечном размере увеличиваетс .Moving the plunger in the axial direction changes according to the law defined by its drive, the resistance of the throttle gap between the channel edges in the plunger and the Windows in the sleeve, i.e., changes the law of flow of the working fluid through the spool according to a given program. The final resistance of the throttle slit is determined by the metal intensity of the mold and the injection mode, but the shape of the slit may vary depending on the ratio of its length and width .; Since the resistance of the throttle slit varies due to a change in its length (the width remains constant), the longer, and therefore narrower, the slit, the more accurately the Target flow rate change through the spool program is reproduced. However, a narrow slit reduces the sensitivity of the spool to the corrections introduced by feedback, as the time for the slit resistance to change with its small transverse size increases.

Claims

The purpose of the invention is to increase the sensitivity to adjustment when the acceleration characteristics deviate from a given program. The goal is achieved by the fact that the throttle valve is equipped with additional plungers installed in the housing from the spring side coaxially with each other and parallel to the end surface of the cylindrical plunger, and a leash fixed eccentrically on the end surface of the cylindrical plunger and located between the ends of the additional plungers, while the sleeve is installed rotatable around its own. The accuracy of the proposed spool is ensured by a long and narrow throttle gap and does not affect its sensitivity. ity, which is provided by rotating the plunger around the longitudinal axis t. e. by changing the cross razmerascheli throughout its length. FIG. 1 shows the proposed spool, section; in fig. 2 shows section A-A in FIG. I; in fig. 3 shows a section BB in FIG. I. The spool includes a housing I with underwater 2 and 3 bypass channels, a sleeve 4. With an inner 5 and an outer 6 grooves, rectangular windows 7 and a turning actuator 8, a plunger 9 with a transverse channel 10 of rectangular section and a leash 11 fixed eccentrically on its torsion surface on the spring side 12 and interacting with the ends of additional plungers 13 and 14, mounted in housing I parallel to the end surface of plunger 9, drive 15 axial displacement of plunger 9 and feedback feedback 16. The spool works as follows. In the initial pressure condition in the cavities 17, 18 and 19 there is no control, the plunger 9 under the action of the spring 12 is in the extreme left position, the sleeve 4 is rotated by means of the rotation actuator 8 and fixed in such a position that its transverse channel 10 intersects with its windows 7, channels 2 and 3 of the body are separated, channel 2 is connected to a source of working fluid overpressure. When a control pressure is supplied to the cavity 17 of the actuator 15, the plunger 9 begins to move. After the plunger passes the dead zone, throttle slots formed by the edges of the channel 10 and the windows 7 begin to open. The working fluid through the channel 10, the throttling slits and the external groove 6 enters the bypass channel 3. According to a predetermined program in accordance with which the plunger 9 moves, the increase in consumption to disperse the pressing Porsch. With the help of feedback feedback 16, the developed characteristics of its acceleration are fixed throughout the stroke of the plunger 9 and when the latter deviate from the programmed plunger, for example 18, into one of the cavities of the plunger rotation drive, the pressure is applied (cavity 19 is connected). plunger rotation, the throttle gap increases or decreases dramatically due to a change in transverse size. The result is the alignment of the specified and waste overclocking characteristics. The invention makes it possible to increase the reproduction accuracy of a given acceleration program, which ultimately leads to an increase in the quality of the castings. Claims Throttle valve for injection molding pressurized machine, comprising a housing with underwater and bypass channels of the working fluid, a sleeve installed in the housing and having rectangular windows diametrically opposed, rotatable spring-loaded cylindrical plunger placed in the sleeve and having an opening A transversely directed channel of rectangular cross section, the edges of which and the rectangular windows of the liner form throttles and a feedback coupling, characterized by o, in order to increase the sensitivity to the adjustment when the acceleration characteristics deviate from the given program, it is equipped with additional plungers installed in the spring-side housing coaxially with each other and parallel to the end surface of the cylindrical plunger and a leash fixed eccentrically on the end surface of the cylindrical plunger and placed between the ends of the additional plungers, while the sleeve is installed with the possibility of rotation around its axis. Sources of information taken into account in the examination 1. USSR author's certificate in application No. 239555, cl. B 22 D 17/32, 08/04/76.

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(par.1; $ k