JP4744915B2 - Electric actuator with manual operation mechanism - Google Patents

Description

  The present invention relates to an electric actuator that is mounted on a rotary valve such as a ball valve or a butterfly valve and is provided with an operation mechanism that allows manual operation of a valve body of the valve, and the switching operation between electric operation and manual operation is ensured. The present invention relates to an electric actuator with a manual operation mechanism that can be performed.

Conventionally, there are electric and pneumatic actuators that control the rotation of rotary valves, etc. In the case of electric actuators, a gear reduction mechanism is installed inside, and the driving force from the electric motor is controlled by the gear reduction mechanism to reduce the valve. The valve body is rotated by transmitting to the rod.
In such an actuator, for example, when power supply is cut off due to a power failure or maintenance, it may be necessary to manually rotate the valve body. For this reason, this type of actuator is provided with a manual operation unit capable of manually operating the valve body.

As an actuator provided with a manual operation part, for example, a manual base shaft provided in a gear part meshing with one of a gear group of a gear reduction mechanism and a manual operation shaft supported by an actuator cover are provided detachably, There is a valve actuator with a manual operation mechanism that enables the body to be switched between an automatic operation state and a manual operation state (see, for example, Patent Document 1).
This valve actuator has a manual operation shaft and an output shaft on separate axes, and can be operated with a light operating force by locking the manual base shaft and the manual operation shaft during manual operation, so a gear reduction train using a worm gear etc. Compared with a manual operation method in which a manual operation unit is provided, or a manual operation method in which a valve body is directly rotated using a tool such as a spanner, the operability is excellent.

FIG. 10 shows the internal structure of a manual operation mechanism of this type of valve actuator. The manual operation mechanism 101 includes a manual base shaft 104 provided in a gear mechanism that meshes with a gear reduction mechanism (not shown), a manual operation shaft 105, and a manual operation body 106 that operates the manual operation shaft 105. A cylindrical portion 107 is integrally provided at the lower portion of the operation shaft portion 105, or a separate portion is fixed integrally by welding means.
The limit switch body 108 is placed and fixed on the plate 110 attached in the cover body 109 so that the operation lever portion 108a is at a predetermined height from the plate 110. The operation lever portion 108a is turned on / off. As a result, power supply from a power supply motor (not shown) is supplied and stopped to prevent unexpected operation during manual operation and to ensure safety.

During electric operation, when the manual operation body 106 is pushed down as shown in the figure, the manual operation shaft portion 105 and the cylindrical portion 107 connected to the manual operation body 106 move downward, and the bottom surface side of the cylindrical portion 107 is the manual base shaft portion 104. The projecting portion 107a formed on the cylindrical portion 107 becomes the position of the actuating lever portion 108a when reaching the position of the reduced diameter shaft portion 104a provided on the power source, and the actuating lever portion 108a is pressed by the projecting portion 107a. Power supply to the motor is started. The height of the projecting portion 107 a is set to the pressing position of the operating lever portion 108 a by fitting the split ring 105 c attached to the manual operation shaft portion 105 into the ring groove 109 b formed in the insertion hole 109 a of the cover body 109. It is adjusted so that.
Further, at the time of manual operation, by pulling up the manual operation body 106 from the state of FIG. 10, the projecting portion 107a of the cylindrical portion 107 is disengaged from the position of the operating lever portion 108a, and the limit switch body 108 is turned off. The manual operation by the manual operation body 106 is possible by fitting the engagement portion 104b having an enlarged diameter of the portion 104 with the fitting portion 105a of the manual operation shaft portion 105. In this way, this type of actuator turns on and off the power supply by operating / inactivating the limit switch, and ensures safety so that it does not operate electrically during manual operation.

Since the cover body 109 may be temporarily removed and reassembled at the time of inspection or failure, the cover body 109 is attached to the base portion 100 by an attachment member such as a bolt (not shown). A seal packing 111 is provided on the contact surface between the cover body 109 and the base portion 100. Usually, the width of the concave groove portion 100a of the base portion 100 on the mating side is fitted to ensure easy assembly. It is formed to be larger than the width of the wall thickness of the cover body 109 which is the side, and to provide a gap s.
When the cover body 109 is attached, the cover body 109 and the base part 100 are assembled in a state where the cover body 109 and the base part 100 are sealed by the seal packing 111 while the end face side of the cover body 109 is fitted into the groove part 100a of the base part 100 and is bolted. Yes.
JP 2004-218735 A

However, each part to be machined is provided with a dimensional tolerance in processing, and a dimensional error may occur in each part constituting the manual operation mechanism unit 101 of Patent Document 1 and FIG.
For example, for a limit switch 108, the height _{h 3} of the actuating lever portion 108a to the cover body 109 mounting surface 100b of the base portion 100 is a height dimension error such as the following have been accumulated.
The plate 110 in FIG. 10 is often formed by die casting because it can be manufactured in large quantities at a low cost. However, when formed by die casting, the size (thickness) is due to tolerances in manufacturing the casting surface. ) to sometimes variations occur, there is the height _{h 1} from the mounting surface 100c of the plate 110 to the plate 110 top surface would change. Therefore, when placing the limit switch 108 on the die cast surface, the height _{h 3} of the actuating lever portion 108a to the cover body 109 mounting surface 100b of the base portion 100, a cover member 109 mounted in the base portion 100 The height h ₀ from the surface 100b to the mounting surface 100c of the plate 110, the height h ₁ from the mounting surface 100c of the plate 110 to the upper surface of the plate 110, and the height h ₂ from the upper surface of the plate 110 to the operating lever portion 108a. This is the height obtained by integrating dimensional errors. Furthermore, when the die casting mold is worn out, in order to improve this dimensional accuracy, it may be possible to finish the molded product after die casting, but it is desirable to perform the finishing process because it increases the cost. is not.

Also it relates to the manual operation unit 105, the height _{h 4} of the protruding portion 107a of the cylindrical portion 107 to the cover body 109 mounting surface 100b of the base portion 100, from the bottom side of the cover body 109 to the ring groove 109b of the insertion hole 109a The height h ₅ , the fitting position error h ₆ between the ring groove 109 b and the split ring 105 c mounted on the manual operation shaft portion 105, and the distance h ₇ between the split ring 105 c and the protruding portion 107 a of the cylindrical portion 107. The height is the accumulated error. Further, this dimensional error is further increased when the manual operation shaft portion 105 and the cylindrical portion 107 are connected by welding, or due to a dimensional error of the seal packing 111 disposed between the base portion 100 and the cover body 109. It is also possible to grow.
As described above, when there is a dimensional error in the parts constituting the manual operation mechanism unit 101, the height h ₃ of the operating lever unit 108a with respect to the cover body 109 mounting surface 100b of the base unit 100, and the height of the projecting unit 107a. results each dimensional error of h ₄ is integrated, it changes the position in the height direction relationship protrusion 107a for actuating levers 108a, even depressing the manual operating member 106 from the plate 110 top surface to the actuating lever 108a at the time of motor operation such as the height h ₂ and the plate 110 from the top surface to the protrusion 107a of the cylindrical portion 107 height h ₈ does not match, correct the actuating lever portion 108a as reliably electric and manual switching mechanism unable off There was a possibility that operation could not be performed.

  Further, when the cover body 109 is removed at the time of inspection or failure, and the cover body 109 is attached to the base portion 100 again, a gap s is provided between the cover body 109 and the base body 100. May be attached in a state shifted from front to back and from side to side. When the cover body 109 is attached in a shifted state, the manual operation shaft portion 105 and the cylindrical portion 107 that are pivotally attached to the cover body 109 may be attached to the left and right sides. The portion 105 and the cylindrical portion 107 are attached to be inclined, and during manual operation, the shaft portion 105b of the manual operation shaft portion 105 interferes with the insertion hole 109a of the cover body 109 so that the rotational force of the manual operation body 106 becomes dull and the handle operation is reduced. There is also a risk that the steering wheel operation may become impossible due to difficulty in scoring or galling.

  The present invention has been developed as a result of intensive studies in view of the above-described actual circumstances, and the object of the present invention is to make it possible to reliably perform switching operation between electric operation and manual operation, and has high handle operability. An object is to provide an electric actuator with a manual operation mechanism.

In order to achieve the above object, an invention according to claim 1 is an electric actuator that outputs a motor drive to an output shaft via a gear reduction mechanism, and an interlock switch is positioned and fixed on a reference surface in the actuator. A manual shaft that interlocks with the output shaft is erected on the reference surface near the switch, and a connecting body having a cam portion is moved up and down so that the manual shaft can be interlocked. The lower end of the connecting body abuts the reference surface. when in contact, the separable therefrom set the switch part of the switch cam portion of the coupling body only, Rutotomoni vertically movable manual operation shaft via the position absorbing mechanism in an upper portion of the coupling body, the coupling When the corner is protruded in the cylindrical portion of the body and the manual operation shaft is raised, the connection body and the manual operation are performed via a connection structure in which the corner and the corner formed at the upper end of the manual shaft are engaged. The shaft can be connected for rotation. So the when lowering the manual operation shaft, a manually operated mechanism with the electric actuator is disengaged the coupling structure.

  According to a second aspect of the present invention, in the position absorbing mechanism, the lower end of the manual operation shaft is fitted to the cylindrical portion of the coupling body with a predetermined gap, and both ends of the pin are joined to the manual operation shaft and the coupling body by pin coupling. Is loosely fitted in the long hole formed in the connecting body to provide a predetermined gap between the long and short diameters of the long hole on the outer peripheral surface of the pin, and the connecting body is impacted downward with respect to the manual operation shaft. It is an electric actuator with a manual operation mechanism that is a biased mechanism.

The invention according to claim 3 is the electric actuator with a manual operation mechanism in which the inner periphery of the lower end of the cylindrical portion of the coupling body is chamfered.

According to the first aspect of the invention, during the electric operation, the interlock switch is turned on or off when the lower end of the coupling body comes into contact with the reference plane, so that the switching operation between the electric operation and the manual operation is ensured. It is an electric actuator with a manual operation mechanism that can be performed.
In addition, since the connecting body is always brought into contact with the plate-like reference surface in a stable state, the contact with the interlock switch is accurately performed, and the manual operation shaft does not tilt. The steering wheel can maintain its rotational force and exhibit high steering operability . In addition, the manual shaft and the manual operation shaft can be reliably connected, and during manual operation, it can be rotated while preventing power rattling without losing power due to manual operation, and the manual operation that can reliably open and close the valve disc It is an electric actuator with a mechanism.

  According to the second aspect of the present invention, even if a dimensional error of parts or an error occurs during assembly, the error can be absorbed, and the positional relationship between the switch part of the interlock switch and the cam part of the coupling body is made almost constant. Since it can be maintained, it is an electric actuator with a manual operation mechanism that can reliably detect automatic operation or manual operation.

According to the invention of claim 3 , the manual operation and the automatic operation are smoothly switched, and the electric actuator with a manual operation mechanism that can perform the switching quickly.

An embodiment of an electric actuator with a manual operation mechanism according to the present invention will be described in detail with reference to the drawings.
As shown in FIGS. 1 to 3, the electric actuator according to the present invention includes an actuator cover 2, an electric motor 3 disposed in the cover body 2, and a pinion gear 4 provided on a rotating shaft of the electric motor 3. The intermediate gear 5 that meshes with the pinion gear 4, the gear that meshes with the intermediate gear 5, the input gear 6 that is arranged coaxially with the output shaft, and the rotational force from the electric motor 3 is transmitted to the intermediate gear 5. An intermeshing planetary gear reduction mechanism 7 transmitted via the input gear 6, an output shaft 8 rotated by the rotational force decelerated via the gear reduction mechanism 7, and an extension of the output shaft 8. The control shaft 9 includes a cam member 10, a valve opening degree detection member 11 that is turned on / off by the cam member 10, and a manual shaft 14.

In addition, an interlock switch 19 for turning on / off a power supply (not shown) that supplies power to the electric motor 3 and the like is disposed in the actuator cover 2. The interlock switch 19 is provided in the actuator. The manual shaft 14 is provided upright so as to be interlocked with the output shaft 8 on the ground plate 34 in the vicinity of the interlock switch 19 and positioned and fixed on the upper surface 34a which is a reference surface of the ground plate 34.
A connecting body 30 for turning on and off the interlock switch 19 is also placed on the main plate 34. Accordingly, the upper surface 34a of the main plate 34 serves as a reference plane for the height positions of the interlock switch 19 and the connecting body 30. I am doing so.
The switch portion 19 a of the interlock switch 19 is provided so as to be turned on and off by a cam portion 30 c provided on the coupling body 30 that operates in conjunction with the vertical movement of the manual operation shaft 15.

The manual shaft 14 is engaged with the input gear 6 by the gear portion 13, and a manual operation shaft supported above and below the manual shaft 14 via a connecting body 30 so as to be movable up and down by an insertion hole 2 a formed in the cover 2. In this example, a manual operation handle (manual operation portion) 16 made of aluminum die casting is provided on the upper end side of the manual operation shaft 15.
As shown in FIG. 6, a corner 14 a in a plan view hexagonal shape is formed at the upper end of the manual shaft 14, while a corner in a plan view dodecagonal shape is formed in the cylindrical portion 30 a of the connection body 30. The part 30b is provided so as to protrude inward, and the connecting body 30 can be moved up and down to be interlocked with the manual shaft 14.

When fitting the coupling body 30 to the manual operation shaft 15, as shown in FIG. 1, a radial gap a having a predetermined dimension between the lower end of the manual operation shaft 15 and the cylindrical portion 30 a of the coupling body 30. Is provided.
As shown in FIG. 7, the connecting body 30 is provided with a long hole 30 d formed long in the axial direction of the manual operation shaft 15, and the spiral pin is inserted in the state where the manual operation shaft 15 is fitted into the cylindrical portion 30 a of the connection body 30. These are pin-coupled by a pin 33 consisting of The pin 33 is fixed to the through hole 15a of the manual operation shaft 15, and both ends of the pin 33 are loosely fitted into the long hole 30d. The long diameter 30e and the short diameter 30f of the long hole 30d are Are provided with gaps b, c, d and e having predetermined dimensions.

The clearance b · c between the pin 33 and the diameter 30e is set larger than the dimensional error in the height direction of the switch portion 19a of the interlock switch 19 and the connecting body 30, and the pin 33 and the short diameter 30f The gaps d and e are set larger than the dimensional error of the actuator cover 2 in the horizontal direction. Although the long hole 30d may be a round hole, the clearance d · e between the pin 33 and the short diameter 30f increases, so that play in the rotation direction of the coupling body 30 with respect to the manual shaft 14 increases, and the manual shaft 14 Since the engagement between the corner portion 14a and the corner portion 30b of the connecting body 30 may be troublesome, a long hole with the gap d · e set to a minimum dimension is preferable.
In addition, a coil spring 32 is interposed between the coupling body 30 and the manual operation shaft 15 in a resilient state, and the coupling body 30 is resiliently biased downward with respect to the manual operation shaft 15. The spring resilient force of the coil spring 32 is stronger than the pressing force required when the switch portion 19a of the interlock switch 19 is pressed.
The position absorbing mechanism 20 is configured as described above, and the manual operation shaft 15 is provided so as to be movable up and down via the position absorbing mechanism 20 provided on the upper portion of the coupling body 30.

The actuator body 1 is provided so that the manual shaft 14 and the connecting body 30 can be brought into and out of contact with each other by pushing or pulling out the manual operation unit 16 and can be switched between an automatic operation state and a manual operation state.
At the time of automatic operation, as shown in FIGS. 1 and 4, the manual operation unit 16 is pushed in. In a state where the manual operation unit 16 is pushed in, the corner portion 14a of the manual shaft 14 and the corner portion 30b of the connecting body 30 do not engage with each other, and the connecting body 30 is lowered and connected to the corner portion 14a of the manual shaft 14. The connection structure with the corner portion 30b of the body 30 is detached, the corner portion 30b faces the reduced diameter cylindrical portion 14b formed below the corner portion 14a, and the manual shaft 14 is accommodated in the connection body 30. .
At this time, since both ends of the pin 33 are loosely fitted in the elongated hole 30d of the connecting body 30, the connecting body 30 is elastically ejected downward by the coil spring 32, and the lower end is always in contact with the main plate 34. When the lower end of the coupling body 30 comes into contact with the main plate 34, the cam portion 30c at a predetermined height from the lower end comes into contact with and presses the operating lever 19a, and power is supplied to the power supply motor 3 and the like. The rotational force from 3 is decelerated and transmitted to the output shaft 8 through the gear reduction mechanism 7, and the valve body V fixed to the output shaft 8 is rotationally controlled by automatic operation.
The rotational force from the electric motor 3 is transmitted to the manual shaft 14 via the intermediate gear 5 and the input gear 6 and idles in the coupling body 30. Further, as shown in FIG. 1, the cylindrical portion 30a located at the lower portion of the connecting body 30 is fitted to the enlarged diameter cylindrical portion 14c formed below the reduced diameter cylindrical portion 14b of the manual shaft 14, and thus the connecting body. 30 has a centering action to prevent centrifugal runout during rotation. Therefore, backlash does not occur in the connecting body 30, and the connecting body 30 is not moved by the elastic force of the switch part 19a, and the switch part 19a is not turned off.

On the other hand, the manual operation is performed by pulling out the manual operation unit 16 as shown in FIGS. When the manual operation unit 16 is pulled out, the pin 33 fixed to the manual operation shaft 15 comes into contact with the upper end of the long hole 30d of the connection body 30, and the connection body 30 rises together with the manual operation shaft. And the corner | angular part 14a and the corner | angular part 30b engage, and the connection body 30 and the manual operation shaft 15 are connected so that rotation drive is possible, and it will be in the state in which manual operation is possible.
Further, when the lower surface of the connecting body 30 is lifted away from the main plate 34, the cam portion 30c is detached from the switch portion 19a, the pressing of the operating lever 19a is released, and the power supply is stopped.
By rotating the manual operation unit 16 in this state, the manual shaft 14 rotates and the valve body V can be manually operated.
As shown in FIG. 6, in this embodiment, the corner portion 14a has a hexagonal shape in plan view and the corner portion 30b has a dodecagonal shape in plan view. However, the present invention is not limited to this shape. Other shapes may be used as long as they can be engaged.
Further, in the present embodiment, the switch portion 19a is turned on during the electric operation, and the switch portion 19a is turned off during the manual operation. Good.

At the time of switching from electric operation to manual operation, the switch portion 19a is provided in such a positional relationship that the corner portion 14a and the corner portion 30b are engaged after the switch portion 19a is detached from the cam portion 30c. Even in such a case, the rotation of the manual operation shaft 15 can be brought into a state where it can be manually operated after it has stopped once reliably, thereby preventing an operator from being injured.
As described above, during the manual operation in which the cam portion 30c and the switch portion 19a are separated from each other and in the state where the actuator cover 2 is removed, the power supply is surely stopped.
Further, since the chamfered portion 30g is formed by chamfering the inner periphery of the lower end of the cylindrical portion 30a of the connecting body 30, the connecting body 30 is manually operated when the connecting body 30 is pushed in when switching from manual operation to electric operation. The shaft 14 does not get caught by the step between the reduced diameter cylindrical portion 14b and the enlarged diameter cylindrical portion 14c, and is smoothly fitted.

  As shown in FIG. 1, grooves 2 b and 2 c are formed on the inner peripheral surface of the insertion hole 2 a formed in the actuator cover 2, and the groove 2 b is provided on the outer peripheral surface of the manual operation shaft 15. For example, the C-shaped split ring 17 is fitted to hold the position of the manual operation shaft 15 during electric operation, and the split ring 17 provided on the outer peripheral surface of the manual operation shaft 15 is fitted to the groove 2c. The position of the manual operation shaft 15 is maintained during manual operation. Reference numeral 18 denotes an O-ring, and the O-ring 18 seals the manual operation shaft 15 and the insertion hole 2a. Reference numeral 38 denotes a sealing member that seals the sealing surfaces of the cover 2 and the base body 1a.

  The actuator cover 2 is attached to the base body 1a via a mounting member (not shown) such as a bolt. When removing the actuator cover 2, when the actuator cover 2 is pulled up after removing the mounting member, the manual operation shaft 15 is engaged with the groove 2c of the insertion hole 2a of the actuator cover 2 via the split ring 17. Simultaneously with the lifting of the actuator cover 2, the manual operation shaft 15 is lifted, the engagement state between the corner portion 14 a of the manual shaft 14 and the corner portion 30 b of the coupling body 30 is released, and the actuator cover 2, the manual operation shaft 15, and the coupling body 30 are released. And it has the structure which can remove the manual operation part 16 simultaneously.

Therefore, when the actuator cover 2 is pulled up during the electric operation in which the corner portion 14a and the corner portion 30b are not engaged, the corner portion 14a and the corner portion 30b are in a locked state without being engaged. The cover 2 cannot be removed.
In order to engage the corner portion 14a and the corner portion 30b, manual engagement must be performed, and the actuator cover 2 can be removed only in a manual operation state, that is, in a state where power supply is not stopped. The structure is not possible.

  When the actuator cover 2 is attached, the corner 30b of the coupling body 30 attached to the manual operation shaft 15 whose axis is maintained by the insertion hole 2a of the actuator cover 2 and the corner 14a of the manual shaft 14 are engaged. After being combined, it is attached to the base body 1a via an attachment member such as a bolt. 1 and 5 is a partial explanatory view of the positional relationship between the pin 33 and the elongated hole 30d as viewed from the axial direction of the pin 33.

Next, an example of the intermeshing planetary gear speed reduction mechanism 7 employed in the present embodiment will be described.
As shown in FIG. 2, the intermeshing planetary gear speed reduction mechanism 7 is disposed coaxially with the output shaft 8, and includes an eccentric body 22 into which the input gear 6 is inserted and fixed, and the eccentric body. An external gear 23 provided so as to be able to swing and rotate through 22, an internal gear 24 that is fixed to the fixed side of the base body 1 a and the like and is in mesh with the external gear 23, and the external gear 23. The rotation transmission mechanism 25 takes out the rotation of rotation from the swinging rotation and transmits it to the output shaft 8, and the output shaft 8 connected via the rotation transmission mechanism 25.

The eccentric body 22 is disposed so as to be rotatable relative to the output shaft 8 via a bearing 26. As shown in FIG. 8, the center of the eccentric portion 22a is offset from the output shaft 8 by an eccentric amount g. I have a heart.
A bearing 27 is provided on the outer peripheral portion of the eccentric portion 22 a of the eccentric body 22, and the external gear 23 is rotatably provided via the bearing 27.
The external gear 23 has a trochoidal tooth profile 23a on the outer periphery, and an internal gear 24 that is in mesh with the external gear 23 is fixed to the base body 1a. The adjacent inner circumference has an arc tooth profile 24a.

  The rotation transmission mechanism 25 includes a plurality of inner pin holes 23b formed in the external gear 23, an inner pin 28 loosely fitted in the inner pin hole 23b, and the inner pin 28 integrally or separately. The pin flange 29 is formed and fixed to the output shaft 8.

When the electric motor 3 disposed on the base body 1a is driven, the pinion gear 4 provided on the rotating shaft of the electric motor 3 rotates, and the output shaft 8 is connected via the intermediate gear 5 meshing with the pinion gear 4. And the input gear 6 disposed coaxially with each other.
The input gear 6 is attached and fixed to an eccentric body 22 disposed coaxially with the output shaft 8, and the eccentric body 22 is rotated by the rotational force transmitted to the input gear 6.
Due to the rotation of the eccentric body 22, the external gear 23 tries to swing and rotate around the output shaft 8, but the rotation is restricted by the internal gear 24 fixed to the fixed side of the base body 1a and the like. The external gear 23 swings while internally meshing with the internal gear 24.

  For example, if the number of teeth of the external gear 23 is N and the number of teeth of the internal gear 24 is N + 1, the difference in the number of teeth is 1, and the external gear 23 is fixed to the base body 1a and the like every rotation of the eccentric body 22. The internal gear 24 fixed to the side is shifted by one tooth. That is, autorotation occurs. This means that one rotation of the eccentric body 22 is decelerated to a rotation of -1 / N of the external gear 23.

As for the rotation of the external gear 23, the swing component is absorbed by the gap between the inner pin hole 23 b and the inner pin 28 formed in the external gear 23, and the rotation of rotation is transferred to the pin flange 29 via the inner pin 28. Is transmitted to the output shaft 8 connected to the pin flange 29.
Accordingly, the rotation of the external gear 23 is rotated to the output shaft 8 and the valve shaft (not shown) connected to the output shaft 8 is rotated.

Next, the operation of the electric actuator with a manual operation mechanism of the present invention in the above embodiment will be described.
In the actuator body 1 according to the present invention, an interlock switch 19 is positioned and fixed on a reference surface 34a in the actuator, and a manual shaft 14 that interlocks with the output shaft 8 is erected on a ground plate 34 in the vicinity of the switch 19 so that the manual shaft 14, the connecting body 30 having the cam portion 30c is moved up and down so as to be interlocked. When the lower end of the connecting body 30 comes into contact with the reference surface 34a, the cam portion 30c can be brought into and out of contact with the switch portion 19a. When the electric operation is performed, the shift of the height position of the cam portion 30c of the coupling body 30 with respect to the height position of the switch portion 19a of the interlock switch 19 is absorbed and reliably positioned at a predetermined height. Switching during manual operation can be performed.
That is, during the electric operation, the interlock switch 19 can be reliably turned on / off only by the positional relationship between the switch portion 19a and the cam portion 30c with respect to the reference surface 34a. 19, the dimensional error of the height from the mounting surface of the cover body 2 of the base body 1a to the mounting surface of the base plate 34, the height from the mounting surface of the base plate 34 to the upper surface 34a (reference surface) of the base body 1 and the manual operation unit The height from the bottom surface side of the cover body 2 to the ring groove 2b of the insertion hole 2a, the fitting position error between the ring groove 2b and the split ring 17 attached to the manual operation shaft 15, the distance between the split ring 17 and the pin 33 The influence of the dimensional error can be eliminated.
Here, as an alternative technique for accurately operating the interlock switch 19 while corresponding to the dimensional error, a structure in which the axial length of the cam portion is set to be long is also assumed, but manual operation when switching between electric and manual operation is assumed. The shaft stroke becomes longer, resulting in a larger actuator. According to the electric actuator of the present invention, the interlock switch 19 can be accurately operated with a compact structure.

Further, the lower end of the manual operation shaft 15 is fitted to the cylindrical portion 30a of the connecting body 30 with a predetermined gap a, and both ends of the pin 33, which is a pin connection between the manual operation shaft 15 and the connecting body 30, are connected to the connecting body 30. Predetermined gaps b, c, d, e are provided between the long diameter 30 e and the short diameter 30 f of the long hole 30 d on the outer peripheral surface of the pin 33 by being loosely fitted in the formed long hole 30 d, and the coupling body 30 is provided by the coil spring 32. Is urged downward with respect to the manual operation shaft 15, the connecting body 30 can move in the horizontal direction with respect to the manual operation shaft 15, and the main plate 34, the cover 2, and the manual operation shaft 15 are die-casted. Even if a dimensional error occurs due to the processing means having a low dimensional system such as the above, the cam portion 30c can be reliably set with respect to the position of the switch portion 19a by absorbing the horizontal error. For example, even when the cover 2 is attached in a state of being displaced with respect to the base body 1a during maintenance or the like, the interlock switch 19 can be reliably turned on / off.
Further, since it is not necessary to weld the connecting body 30 to the manual operation shaft 15 or to perform plating, it is easy to manufacture, and not only can the dimensional error of the manual operation shaft 15 be reduced, Cost can also be reduced.

FIG. 9 shows another embodiment of the electric actuator with a manual operation mechanism according to the present invention. In this embodiment, a cap 35 is manufactured using plastic or the like as a material, and the cap 35 is moved to the position absorbing mechanism 40. It is made to cover from the connection body 30 of this.
When assembling the position absorbing mechanism 40, the cap 35 is inserted into the manual operation shaft 15 via the coil spring 32, and the cap 35 is lifted upward against the elastic force of the coil spring 32. After the coupling body 30 is inserted and the pin 36 is inserted into the elongated hole 30d of the coupling body 30 and the manual operation shaft 15, the cap 35 is lowered downward to the coil spring 32 in accordance with the elastic force. To fit in.
The pin 36 in this example is a parallel pin. By using the parallel pin 36 in this way, it is not necessary to fix the manual operation shaft 15 by a driving operation like a spiral pin, and it is only inserted into the manual operation shaft 15. Can be easily assembled and disassembled, and can handle sudden repair work. In addition, after the cap 35 is attached, the coil spring 32 presses the cap 35, so that the skirt portion 37 provided in the cap 35 reliably closes the long hole 30 d of the coupling body 30, and the parallel pin 36 is placed in the cap 35. Since it can be built in, the parallel pin 36 can be prevented from being displaced or dropped.

  Further, during inspection / maintenance of the electric actuator, the connecting body 30 is removed from the manual operation shaft 15 removed together with the cover 2, and only the connecting body 30 is attached to the manual shaft 14 again, and the lower end of the connecting body 30 is brought into contact with the base plate 34. By making contact, the interlock switch 19 can be turned on and the actuator can be in an electric state. Therefore, the maintenance worker can check the actuator in the electric state without directly swinging to the manual operation shaft 14. In the figure, reference numeral 35 a denotes a protruding portion that is formed on the upper surface of the cap 35 and holds the outer periphery of the coil spring 32.

  The present invention can be applied to actuators that operate various valves other than rotary valves, and can also be applied to manual operation mechanisms for various types of actuators, such as pneumatic and hydraulic actuators and actuators that include only manual gears.

It is sectional drawing which shows one Embodiment of the electric actuator with a manual operation mechanism in this invention. It is sectional drawing of the electric actuator with a manual operation mechanism in this invention. It is the top view which abbreviate | omitted a part of electric actuator with a manual operation mechanism in this invention. It is an AA line expanded sectional view in FIG. It is sectional drawing which showed the state at the time of manual operation of the electric actuator of FIG. It is an BB line expanded sectional view in Drawing 5. It is explanatory drawing which showed the mounting state of the switching cam. It is CC sectional schematic sectional drawing in FIG. It is a partial cross section figure showing other embodiments of an actuator at the time of manual operation with a manual operation mechanism in the present invention. It is principal part sectional drawing which shows the conventional actuator for valves.

Explanation of symbols

3 Electric Motor 7 Gear Reduction Mechanism 8 Output Shaft 14 Manual Shaft 14a Corner 15 Manual Operation Shaft 19 Interlock Switch 19a Switch 20 Position Absorption Mechanism 30 Connection Body 30a Tube 30b Corner 30c Cam 30d Long Hole 30e Long Diameter 30f Short Diameter 30g Chamfer 33 Pin 34 Ground plate 34a Top surface of the ground plate (reference surface)
a, b, c, d, e

Claims (3)

In an electric actuator that outputs the motor drive to the output shaft via the gear reduction mechanism, the interlock switch is positioned and fixed on the reference surface in this actuator, and the manual shaft that is linked to the output shaft on the reference surface in the vicinity of this switch When the connecting body having the cam portion on the manual shaft is moved up and down to be interlocked, and the lower end of the connecting body comes into contact with the reference surface, the cam portion of the connecting body is moved to the switch portion of the switch. the separable therefrom set only via said upper to position the absorption mechanism of the connector provided with the manual operation shaft vertically movably Rutotomoni, projecting corners inside the cylindrical portion of the coupling body, the manual operation shaft When the lift is lifted, the connecting body and the manual operation shaft are rotatably connected via a connection structure in which the corner and the corner formed at the upper end of the manual shaft are engaged, and the manual operation shaft is lowered. The connecting structure Manual operating mechanism with an electric actuator, characterized in that to disengage the.   In the position absorbing mechanism, the lower end of the manual operation shaft is fitted to the cylindrical portion of the coupling body with a predetermined gap, and both ends of a pin obtained by pin-coupling the manual operation shaft and the coupling body are formed on the coupling body. A mechanism in which a predetermined gap is provided between the long and short diameters of the long hole on the outer peripheral surface of the pin by loosely fitting into the long hole and the connecting body is elastically biased downward with respect to the manual operation shaft. The electric actuator with a manual operation mechanism according to claim 1. The electric actuator with a manual operation mechanism according to claim 1 or 2 , wherein the inner periphery of the lower end of the cylindrical portion of the coupling body is chamfered.

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