摘要:
An actuator and a spool type directional control valve. The actuator includes a catcher and a shaft. The catcher is provided with a first connecting portion and a second connecting portion. The first connecting portion is used to connect to a spool, and the second connecting portion includes a first limiting portion and an avoidance slot which are connected in a circumferential direction. The shaft includes a shaft body and a control member. The shaft body is used to connect to an operation mechanism and is driven to rotate by the operation mechanism, so that: the control member is capable of abutting against the first limiting portion, and driving the catcher to rotate forward by a first angle a via the first limiting portion so as to drive the spool move forward to a first working position; and the control member is capable of rotating freely in the avoidance slot, and the maximum rotation angle c of the control member in the avoidance slot is not less than the first angle a. With the actuator, the hysteresis of the directional control valve may be reduced, and asymmetrical hysteresis of the directional control valve when the spool moving in different directions can also be avoided.
摘要:
Control circuit for a pneumatically controlled vehicle door comprising a double-acting pneumatic cylinder (9) operable to open and close said door and having a first chamber (10) and a second chamber (11), a main pneumatic control block (5) having a first working port (7) and a second working port (8), a fist line (12) connected to the first chamber (10) of the cylinder (9) and constituting a release line in a given movement direction of the cylinder (9) corresponding to a first movement direction of the door, and a second line (13) connected to the second chamber (11) of the cylinder (9) and constituting a filling line in said movement direction; circuit (1) comprises a safety device (42) configured to connect the first line (12) to the first working port (7) in normal operation and to connect the first line (12) to the second line (13) in response to a control signal identifying that the door is blocked by an obstacle in said first direction of movement of the door.
摘要:
A circuit pressure control unit includes a relief valve and a variable throttle valve. The relief valve is connected to a connecting passage communicating with an actuator upstream. The variable throttle valve is disposed upstream of the relief valve and is configured to change an opening degree thereof according to a control signal from a controller.
摘要:
A handheld wired remote control unit for battery-operated hydraulic power systems comprises a hydraulic actuator command circuit, a battery level control circuit and an audio/visual operator assistance module. The remote control unit generates a command signal in response to action on the remote control unit by an operator so that the hydraulic actuator can be operated. The battery level control circuit receives a control signal representative of a charge level of a battery that supplies energy to said actuator, and processes it. The audio/visual operator assistance module thus generates an operator assistance event related to the charge level of the battery, such as a flashing light or a buzzing sound. A battery cut-out circuit in the operator assistance module prevents operation of the actuator when the battery level is too low.
摘要:
The invention relates to a valve device (11) having at least one base body (12) having at least one receptacle (30), in which a manual backup actuating device (25) is disposed, comprising a backup valve (29) having a valve housing (31) inserted in the receptacle (30) and at least one backup valve member (32) supported in the valve housing (31) and a manually actuatable actuating member (56) having a driven connection to the backup valve member (32), wherein the backup valve member (32) can be switched by means of the actuating member (56) between a base position and a working position applying pressure medium to an associated main valve (13) bypassing a pilot valve (70) associated with the main valve (13), the actuating member (56) being disposed on the valve housing (31) forming an installable unit integrated with the backup valve (29).
摘要:
The invention relates to a valve device (1), which has at least one manual, auxiliary actuating mechanism (25a, 25b), which contains a manually actuatable actuating mechanism (26a, 26bs), which can be locked releasably in the actuated state. A movable covering element (45) may be positioned alternatively in a release position, in which access to the actuating element (26a, 26b) is released, or in a covering position, in which access is prevented. When the covering element (45) is in the locked state of the manual, auxiliary, actuating mechanism (25a, 25b), locking means (57) prevent it from being moved into the covering position.
摘要:
Betätigungsanordnung für um eine Drehachse (2) schwenkbare Teile an Fahrzeugen, insbesonders für Türen (1), mit zumindest einer mit dem schwenkbaren Teil gekoppelten gleichgängigen Arbeitszylinder-Anordnung (3) für beide Schwenkrichtungen, einem die Arbeitszylinder-Anordnung versorgenden Arbeitsfluid-System und einem auf das Arbeitsfluid-System einwirkenden Steuerkreis, der zumindest einen Sensor (16, 17, 18) und ein Steuergerät (6) aufweist, wobei im Arbeitsfluid-System zumindest eine Verbindungsleitung (19; 22, 21, 23) zwischen den in entgegengesetzter Richtung wirkenden Arbeiträumen (4, 5) der Arbeitszylinder-Anordnung (3) vorgesehen und je Arbeitsraum (4, 5) zusätzlich je eine sperrbare Verbindungsleitung zwischen dem Arbeitsraum und einem Reservoir (11) für das Arbeitsmedium geschaffen ist. Um mit einer einzigen, einfach aufgebauten und mit einer geringen Anzahl von Bauteilen auskommenden Konstruktion die größtmögliche Flexibilität und der größtmögliche Funktionsumfang zu erreichen, ist vorgesehen, dass in zumindest einer der Verbindungsleitungen zwischen den Arbeitsräumen (4, 5) der Arbeitszylinder-Anordnung (3) zumindest ein Proportional-Halteventil (21) mit über das Steuergerät (6) einstellbarem Öffnungsdruck eingesetzt ist.
摘要:
Eine Anordnung zur hydraulischen Betätigung eines Verdecks od. dgl. an einem Fahrzeug, ist mit zumindest einem doppeltwir kenden hydraulischen Arbeitszylinder versehen, dessen Arbeitsräume mit jeweils einer Seite einer umschaltbaren Druckquelle in Verbin dung stehen. Um auf einfache und sichere Weise eine Fixierung und anschließende Notbetätigung beispielsweise des Verdecks in zumindest einer Richtung zu ermöglichen, sind die beiden Arbeitsräume (2, 3) des oder jedes Arbeitszylinders (1) über eine Verbindungsleitung (12, 24) miteinander verbunden, in der ein sperrbares Rück schlagventil (13; 25, 26) eingesetzt ist, dessen Ventilelement (26) über einen hydraulisch betätigten Steuerkolben (29) mit größerer Fläche als der Ventilsitz (25) sperrbar ist: daß in der Hydraulikleitung (4, 22) zu einem der Arbeitsräume des oder jedes Arbeitszylinders eine Drossel (15, 27) eingesetzt ist, die Verbindungsleitung (12, 24) zwischen dieser Drossel und dem oder jedem Arbeitszylinder ansetzt und die Steuerleitung (14, 28) für das sperrbare Rückschlagventil (13; 25. 26) zwischen der Druckquelle (7) und der Drossel (15) ansetzt.