JPH0140321Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a piston-type actuator suitable for use as a drive source for various valve devices, and in particular, to perform automatic operation by remote control and manual operation in the event of a failure. Regarding actuators that can.

[Prior art]

For example, as an operating mechanism for automatically and remotely controlling various controlled objects such as valve devices, a piston is slidably supported within a cylinder, and the piston is selectively inserted into cylinder chambers formed on both sides of the piston. Springless type piston type actuators have been known for a long time, which are able to obtain various driving forces by converting air pressure into linear motion by reciprocating the actuator using fluid pressure, especially air pressure, supplied to the actuator. . These piston type actuators are smaller than the diaphragm type actuators that are generally used as the drive source for this type of valve device, and yet can provide a larger output and stroke amount. Double port valve, air vane, variable resistor,
It can also be used as an operating device for other operating ends that require proportional position movement to achieve its effects.

As such a piston type actuator,
Conventionally, a configuration as schematically shown in FIG. 1 has been known. To explain this simply, the reference numeral 1 in the figure is a cylinder body formed in the shape of a cylinder with a bottom, and the reference numeral 2 is a lid body that closes the upper open end of the cylinder body 1, which makes it approximately disc-shaped. A cylinder is configured to slidably hold the formed piston 3. Here, 4 in the figure is a cylindrical body that slidably holds the piston 3. Reference numeral 5 designates a rod 5 for transmitting operating force, the upper end of which is connected to the central portion of the piston 3 on the lower chamber side of the cylinder and is suspended along the central axis of the rod. The piston 3 extends downwardly through the lower end of the piston 3, and its tip is connected to a controlled object such as a valve device and serves as an operating end for transmitting the movement of the piston 3. In the cylinder chambers 6a and 6b formed on both sides of the piston 3 in this cylinder, during automatic operation, the required air pressure is introduced from air pressure introduction holes 7a and 7b formed in the cylinder body 1 and the lid body 2, respectively. Air pressure is introduced, and the piston 3
is moved up and down, and the operating force is thereby transmitted to a controlled body (not shown) via the rod 5.

On the other hand, on the upper chamber side formed between the lid body 2 and the piston 3 above the cylinder body 1,
The inner end of a manual operating shaft 10 that passes through the lid body 2 and is guided is fixed to the center of the upper part of the piston 3. They are arranged in series. A threaded portion 11 is formed on the outer periphery of the outer end of the manual operating shaft 10, and an inner threaded portion 12a of a cylindrical nut body 12 is screwed into this threaded portion 11. Further, at the outer end of this cylindrical nut body 12,
A manual rotary handle 13 is provided for moving the manual operating shaft 10 forward and backward into the cylinder via the cylindrical nut body 12.

Further, the manual operation shaft 10 and the cylindrical nut body 12 on its outer periphery pass through a through hole 14a formed in the upper end of an inner cap body 14 that is fixedly mounted on the upper end of the lid body 2. The cap 15 protrudes to the outside and is disposed so as to pass through a through hole 15a at the upper end of an outer cap 15 which is covered further outside the inner cap 14. and,
This outer cap body 15 is rotatably and slidably provided in the axial direction with respect to the inner cap body 14, and an operating lever 16 on its outer periphery is used to switch between automatic operation and manual operation. is provided. Here, automatic operation is possible at the position of the operating lever 16 shown by the solid line in the figure, and manual operation is possible at the position shown by the imaginary line. In addition,
In the figure, reference numeral 17 denotes a keyway for pulling up the operating lever 16 for manual operation;
When the operating lever 16 is locked to the handle 7, the outer cap body 15 is positioned as shown by the imaginary line in the figure, and the upper end of the outer cap body 15 restricts the movement of the handle 13 in the axial direction. On the other hand,
The rotation of the handle 13 causes the cylindrical nut body 12 to rotate, and as a result, the manual operation shaft 10, which is threaded thereon, can move forward and backward into the cylinder. In addition, 18 and 19 in the figure are the parts between the inner end of the cylindrical nut body 12 and the inner cap body 14, and the outer cap body 15 during the above-mentioned manual operation.
This is a bearing for rotatably connecting the handle 13 and the handle 13.

In such a conventional structure, during automatic operation, the outer cap body 15 faces below the handle 13 with a predetermined movable stroke as shown by the solid line in the figure, so that the cylinder chambers 6a, With the balance of the air pressure supplied to 6b, the handle 13 is configured so as not to impede the movement of the handle 13, which is simultaneously moved up and down together with the manual operation shaft 10 as the piston 3 is reciprocated within the cylinder. . In addition, during manual operation, the outer cap body 15 is moved upward by the operation lever 16, and in this state is locked in the keyway 17, thereby restricting the movement of the handle 13 in the axial direction. The configuration is such that the manual operation shaft 10 can be moved forward and backward into the cylinder by the rotation thereof.

However, in the above-mentioned conventional structure, the handle 13 must be moved to the upper end side in order to perform manual operation, which is not only useless in an emergency when the air pressure supply is stopped, but also makes the operation difficult. The drawback was that it was troublesome and complicated. Furthermore, when such a structure is used in a valve or the like, it must be fully opened or fully closed in order to manually operate the valve, which poses a problem in terms of its functionality.

[Summary of the idea]

The present invention was developed in view of the above circumstances, and one end of the piston is rotatably connected to the piston, which is slidably held within the cylinder, and the other end is extended outside the cylinder. A manual rotation handle is fixed to the manual operation shaft, and a threaded portion is formed on the outer periphery of the intermediate body of the manual operation shaft. The inner circumferential thread of the nut body is screwed on, and a taper ring is wound around the outer periphery of this cylindrical nut body, and the cylindrical nut body is clamped and fixed at a desired position by the tightening force of the taper ring. This simple configuration eliminates the conventional problem of limiting the operating position during manual operation, and even if the piston is located halfway inside the cylinder, it can be easily operated. It is an object of the present invention to provide an inexpensive actuator that can be manually operated appropriately and quickly, and that can exhibit various excellent effects such as not causing any trouble in its operation.

〔Example〕

Hereinafter, the present invention will be explained in detail using embodiments shown in the drawings.

FIG. 2 shows an embodiment of the piston-type actuator according to the present invention. In the figure, first, the schematic structure will be briefly explained. In addition to closing the shaped body 21A and both ends thereof,
A cylinder 21 is comprised of a pair of lower lids 21B and 21C, and a piston 22 is slidably disposed inside the cylinder 21. At the center of the lower surface of the piston 22, there is a rod for transmitting operational output to the outside. 23 is fixedly installed, the other end extends to the outside through the lid 21C, and the tip thereof is configured to be connected to a controlled object (not shown). Desired air pressure is introduced into the chambers 24 and 25 on both sides of the piston 22 in the cylinder 21 from air pressure introduction holes 26 (one not shown), and as a result, the piston 22 is moved up and down. It is.

On the other hand, a manual operation shaft 27 is disposed so as to pass through the upper lid body 21B and face the inside of the cylinder 21.
The tip 27a thereof is rotatably connected to the piston 22 via bearings 28a and 28b. Also, the other end 27b of this manual operation shaft
A rotary handle 29 for manual operation is fixedly attached to the body, and a threaded portion 30 is formed on the outer periphery of the intermediate body. A cylindrical nut body 31 is fitted onto the outer periphery of the threaded portion 30 of this manual operation shaft 27, and is screwed onto the inner periphery threaded portion 31a. The manual operating shaft 27 and the cylindrical nut body 31 extend upward through a through hole 33a of a plate 33 fixed to the upper end of the cylinder 21 via the cylindrical body 32. . Further, the cylindrical body 32 may have any configuration as long as it can support the plate 33 above the cylinder 21 at a predetermined interval.
It can also be a simple support.

Now, according to the present invention, in the actuator 20 having the above-described configuration, the outer periphery of the cylindrical nut body 31 is disposed outside the cylinder 21 and has the manual operating shaft 27 screwed onto the internal threaded portion 31a thereof. A taper ring 35 is wound around and arranged around the cylindrical nut body 3 by the tightening force of this taper ring 35.
1 is characterized in that it is constructed so that it can be clamped and fixed at a desired axial position.

That is, according to the present invention, the cylindrical nut body 31 disposed around the manual operation shaft 27 described above,
During automatic operation, it is held in a loosely fitted state and is moved up and down in conjunction with the movement of these pistons 22, and during manual operation,
The cylindrical nut body 31 is held between the taper rings 35 and the piston 22 can be manually moved by rotating only the manual operation shaft 27. Here, the taper ring 35 mentioned above, as also shown in FIG.
Its outer circumference is a tapered surface 35a, and its inner circumference is a flat surface 35 that is joined to the outer circumference of the cylindrical nut body 31.
b. And this taper ring 35
It is formed by cutting a part of the circumferential direction.

On the other hand, a threaded part 34a on the outer periphery of the lower cylindrical part of the lock nut, indicated by 34 in the figure, is screwed into the threaded part 33b formed on the upper part of the plate 33, and the tapered ring 35 is attached to the inside of the tip part. A tapered surface 34b is formed to apply a tightening force from the outer periphery. It will be easily understood that the above-mentioned taper ring 35 is selectively compressed against the cylindrical nut body 31 depending on the screwing position of the lock nut 34.

In addition, 36 and 37 in the figure are the cylindrical nut body 31.
A pair of disc springs 38 is interposed between the upper end and the handle 29 on the manual operation shaft 27 and holds them in a connected state during automatic operation. This is a metal fitting that is effective in moving both parts together by its elastic force during automatic operation, and for forcing quick and reliable manual operation during manual operation. It is something.

In the actuator 20 as described above, by releasing the locked state by the lock nut 34 and releasing the tightening of the taper ring 35, the piston 22 is automatically driven by the supplied air pressure, and the operation output is transferred to the controlled object. At this time, the manual operating shaft 27 and the cylindrical nut body 31 are reciprocated outside the cylinder 21 in accordance with the movement of the piston 22.

On the other hand, when driving as described above or when manual operation is required, by rotating the lock nut 34 and screwing it into the plate 33, the taper ring 35 tightens and fixes the cylindrical nut body 31 by the action of the taper surface described above. This makes it possible to rotate the manual operation shaft 27 using the handle 29 with respect to the cylindrical nut body 31 fixed on the stationary side, and as a result, the piston 22 is moved into the cylinder 21 by this manual operation. It can be moved freely. In particular, according to the present invention, since the taper ring 35 is tightened or loosened on the cylindrical nut body 31 by the lock nut 34, no matter where the cylindrical nut body 31 is located in the axial direction with respect to the piston 22, It is also possible to easily and appropriately lock the device, thereby solving the conventional problem of limiting the manual operation position.

Note that the present invention is not limited to the structure of the embodiment described above, and the shape, structure, etc. of each part may be modified and changed as appropriate. For example, in the above-mentioned embodiment, a springless type was described as a piston type actuator, but the present invention is not limited to this, and can be easily applied to an actuator having a structure in which a spring is disposed on one side of the cylinder. will be easily understood.

[Effects of the invention] As explained above, according to the actuator according to the invention, one end of the piston is rotatably connected to the piston which is slidably held within the cylinder, and the actuator is pulled out of the cylinder. A manual rotating handle is fixed to the other end of the manual operating shaft, and a threaded part is formed on the outer periphery of the intermediate body of the manual operating shaft, and the manual operating shaft is provided with a threaded part on the outside of the cylinder. At the same time, a taper ring is wound around the outer periphery of the cylindrical nut body, and the cylindrical nut body is moved to a desired position by the tightening force of the taper ring. Despite its simple and inexpensive configuration, the piston can be clamped and fixed in the cylinder, eliminating the problem of conventional methods in which the operating position is limited during manual operation. It is possible to perform manual operation easily, appropriately, and quickly even if the machine is located in the same position, and it is possible to exhibit the required operating characteristics during automatic operation and even during manual operation, and there is no problem with the operation. It has various excellent practical effects, such as not causing any problems.

[Brief explanation of drawings]

Fig. 1 is a schematic sectional view illustrating a conventional piston type actuator, Fig. 2 is a schematic sectional view illustrating an embodiment of the actuator according to the present invention, and Fig. 3 is a perspective view of a tapered ring that characterizes the present invention. be. 20... Piston type actuator, 21...
Cylinder, 22...Piston, 23...Rod for transmitting operating force, 24, 25...Cylinder chamber, 27...
...Manual operation axis, 29...Manual handle, 30...
Outer peripheral threaded portion, 31... Cylindrical nut body, 31a...
Inner peripheral thread portion, 33...Plate, 34...Lock nut, 34b...Tapered surface, 35...Tapering, 35a...Tapered surface.

Claims (1)

[Scope of utility model registration request] One end of the piston is rotatably connected to the piston, which is slidably held within the cylinder, and a manual rotating handle is fixed to the other end pulled out of the cylinder, and a screw is attached to the outer periphery of the intermediate body. a manual operating shaft having a section formed therein; an inner peripheral threaded section of a cylindrical nut body disposed outside the cylinder is screwed into the threaded section of the manual operating shaft; A taper ring is wound around the outer periphery of the cylindrical nut body, and the cylindrical nut body is configured to be clamped and fixed at a desired axial position by the tightening force of the taper ring. An actuator featuring: