JPH0443607Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a manual device for an actuator used, for example, to open and close an automatic control valve.

[Conventional technology]

Generally, as a drive mechanism for automatically and remotely controlling a controlled object such as a valve, the inside of a diaphragm case is defined by a diaphragm, and the diaphragm is driven by fluid pressure supplied into the dial phragm chamber. A so-called diaphragm type actuator is known in which the drive shaft of a controlled object is operated against the repulsive force of a spring.

Conventionally, this type of actuator has a pair of L
A type equipped with a manual device that converts the rotational force of the screw shaft into reciprocating force of the drive shaft using a letter-shaped lever is adopted.

[Problem that the invention attempts to solve]

By the way, this type of manual actuator device does not have a function to restrict the bending of the drive shaft, so it is necessary to apply the rotational force from the screw shaft evenly to both levers during use. Ta. That is, if the drive shaft is bent, fluid may leak from the ground portion of the controlled valve, or the frictional force of the sliding portion due to the side force may increase, resulting in malfunction. As a result, the dimensions of each component must be set with high precision and careful attention must be paid to adjustments during assembly, making the production of each component and the assembly of manual devices complicated. It was hot.

The present invention was developed in view of these circumstances, and eliminates the need to set the dimensions of each component with high precision or pay close attention to adjustments during assembly, thereby reducing the manufacturing and production of each component. To provide a manual device for an actuator that allows easy assembly of the manual device.

[Means for solving problems]

In the manual actuator device according to the present invention, the lever receiving nut is provided with an extending portion that extends in a direction perpendicular to the swing axis of the lever and faces between the two levers, and the extending portion is slightly separated from both the levers. They are placed at equal intervals.

[Effect]

In the present invention, the bending that acts on the drive shaft can be restricted by the extending portion located between both levers.

〔Example〕

Fig. 1 is a sectional view showing the main parts of the manual device for an actuator according to the present invention, Fig. 2 is an exploded perspective view showing the manual device for the actuator, and Fig. 3 is an enlarged view of part A in Fig. 2. The perspective view and FIGS. 4a and 4b are a plan view and a front view showing the lever receiving nut. In the figure, the reference numeral 1 denotes a yoke that holds a pressure vessel (not shown) for the actuator, and a housing 2 that opens downward and forward is fixed to the side by a plurality of bolts 3. There is. Reference numeral 4 denotes a drive shaft that advances and retreats in the vertical direction inside and outside the pressure vessel (not shown), and a lever receiving nut 5 having pins 5a and 5b for lever connection on both sides thereof is fixed to the externally exposed end. . A screw shaft 6 extends in a direction perpendicular to the axial direction of the drive shaft 4, and is rotatably held in the housing 2, and has an operating nut 7 and an operating handle 8 on the threaded portion and the externally exposed end. are provided for each. Reference numeral 9 denotes a through bolt that serves as a pivot of a lever to be described later, and is located above the screw shaft 6 and rotatably supported by the housing 2 via bearings 10 and 11, and is connected to the screw shaft 6 and the drive shaft. It extends in a direction perpendicular to both axes of the shaft 4. A collar 12 is provided around the center of the through bolt 9, and a nut 13 is screwed into the threaded end portion. Reference numerals 14 and 15 denote a pair of levers facing each other, and since they are constructed substantially the same, only one of them will be explained. The lever 14 is pivotally supported by the through bolt 9, and is connected to the bearing 10 and the collar. It is interposed between 12. The entire lever 14 is formed in an L-shape that allows the drive shaft 4 to be moved vertically by the rotation of the screw shaft 6, and the lever receiving nuts 5 are attached to both ends of the lever 14. Elongated holes 14a and 14b are provided in which the pin 5a and the pin 7a of the operating nut 7 are loosely fitted, respectively. Reference numeral 16 denotes an extension portion projecting laterally of the drive shaft 4, which is located between the levers 14 and 15 and is integrally provided with the lever receiving nut 5. This extending portion 16 is connected to both the levers 14 and 15.
It has surfaces 16a and 16b facing the inner surface of the
L ₁ (=53mm) is the dimension between the levers 14 and 15.
The dimensions are set slightly smaller than L ₂ (=55mm),
In addition, the dimension L ₃ (=55 mm) between the tip end surface 16c and the central threaded portion 5c of the lever receiving nut 5 is set to a dimension corresponding to the allowable rotation angle (≒1°) of the drive shaft 4. In addition, 17 is a fork that restricts the rotation of the operating handle 8, and 18 is the operating nut 7.
A pointer 19 indicates the movement position of the screw shaft 6, and a bearing holder 19 supports the handle side end of the screw shaft 6.

In the manual actuator device configured in this manner, when an uneven load acts on the lever receiving nut 5 due to uneven contact between the levers 14 and 15, this acting force is located between the levers 14 and 15. It is added to the extension portion 16 and can restrict bending of the drive shaft 4 toward the side surface of the yoke.

Therefore, in the present invention, it is not necessary to set the dimensions of each component with high precision or to pay close attention to adjustments during assembly.

Next, the operating state of the manual device according to the present invention will be explained.

First, when the operating nut 7 is moved toward the yoke 1 by rotating the operating handle 8, the levers 14 and 15 are rotated in one direction, and the drive shaft 4 is moved upward.

On the other hand, when the actuating nut 7 is moved toward the operating handle 8, the pin 7a presses the handle-side hole wall of the elongated hole 14b, the levers 14 and 15 rotate in the other direction, and the drive shaft 4 moves downward. .

Note that although a diaphragm case is usually used as the pressure vessel for the actuator in the present invention, a cylinder may also be used, and the pressure vessel can be selected as appropriate.

Incidentally, during automatic operation of the actuator in the present invention, by rotating the operating handle 8, the tip of the pointer 18 is aligned with the mark The handle 8 is fixed to the housing 2.

[Effect of idea]

As explained above, according to the present invention, the lever receiving nut is provided with an extending portion that extends in a direction perpendicular to the swinging axis of the lever and faces between the two levers, and this extending portion is connected to the lever between the two levers. Since the levers are positioned at slight intervals, uneven loads acting on the lever receiving nut are applied to the extension part due to uneven contact between the levers, which restricts the bending of the drive shaft toward the side of the yoke. be able to. Therefore, it is no longer necessary to set the dimensions of each component with high precision or pay close attention to adjustments during assembly, making it easier to manufacture each component and assemble the manual device. can.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the main parts of the manual device for an actuator according to the present invention, Fig. 2 is an exploded perspective view showing the manual device for the actuator, and Fig. 3 is an enlarged view of part A in Fig. 2. The perspective view and FIGS. 4a and 4b are a plan view and a front view showing the lever receiving nut. 4... Drive shaft, 5... Lever receiver nut, 6...
...Screw shaft, 14,15...Lever,
16...extension part.

Claims (1)

[Scope of utility model registration request] A lever receiving nut is fixed to the drive shaft of an actuator that moves up and down in the vertical direction due to the action of a pressure medium, and the lever receiving nut is provided with a lever receiving nut that swings around a swinging shaft that is formed in a substantially L shape when viewed from the side and is orthogonal to the drive shaft. A pair of freely movable levers are connected by engaging one swinging end of each lever to both sides of the lever receiving nut, and the other swinging end of these levers is connected to the other swinging end of the lever. In the manual actuator device, the lever is connected to the lever receiving nut by connecting a screw shaft extending along a plane perpendicular to the swing shaft via an operating nut screwed onto the screw shaft. A manual device for an actuator, characterized in that an extension part is provided that extends in a direction perpendicular to the swing axis of the actuator and faces between the two levers, and the extension part is positioned at a slight distance from both the levers. .