JPH0739267U - Manual operation device for electric actuator - Google Patents

Abstract

(57) [Summary] [Purpose] Increase the reduction ratio to facilitate steering wheel operation with a light load. To ensure safety, do not rotate the handle except during manual operation. A worm wheel 25 is provided on the output shaft side of an electric actuator of an electric actuator that converts the rotational force of a servo motor into a linear motion to move a rod forward and backward, and that transmits the rotational force between the servo motor and the output shaft. A worm 27 that rotates around a second rotary shaft 26 that is orthogonal to the first rotary shaft 19 of the worm wheel 25 meshes with the worm wheel 25. The handle 29 is connected to the second rotating shaft 26 of the worm 27,
The worm 27 is rotated around the second rotation shaft 26 by manually rotating the handle 29.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a manual operation device for an electric actuator, and more particularly to an easy manual operation and safety measures.

[0002]

[Prior art]

 BACKGROUND ART Conventionally, as disclosed in, for example, Japanese Utility Model Laid-Open No. 62-198852, an electric actuator is used in a water turbine for power generation in order to change and set an opening / closing angle of a guide vane. Then, this electric actuator normally converts the rotational force of the electric motor into a linear motion via the ball screw shaft and the nut, and advances and retracts the rod provided at the tip to change and set the opening / closing angle of the guide vane. Is done. In addition, this electric actuator is equipped with a manual operation device, and when a trouble or power failure occurs in the control system, or when the electric actuator is inspected or adjusted, the electric actuator is operated by the above-mentioned manual operation device.

[0003]

[Problems to be solved by the device]

 However, the conventional manual operation device described above is configured by engaging a large gear fixed to the output shaft of the electric motor with a pinion fixed to the rotary shaft above the gear, and attaching a handle to the rotary shaft fixed to the pinion. Therefore, the rotational force of the handle is transmitted to the output shaft of the electric motor by the engagement of the teeth of the large gear and the pinion (both spur gears) cut in parallel with each other, and the load during manual operation is increased. However, there is a problem that the steering wheel becomes difficult to operate due to the large size. Also, with this manual operating device, there is a limit to increasing the reduction ratio because the large gear and the pinion are meshed, and some countermeasures are desirable for electric actuators such as power generation turbines that require particularly large thrust. Be done.

Further, in the above-mentioned manual operation device, since the large gear and the pinion are always meshed with each other, the handle always rotates without stopping when the electric actuator is operating, and there is no movement. It is not safe to be outside.

The present invention has been made in view of the above point, and its object is to reduce the speed by changing the meshing manner of the gears, that is, by adopting a gear of a type different from the spur gear. The purpose is to increase the ratio to facilitate the rotating operation of the steering wheel, etc. with a light load. There are also attempts to ensure safety by not rotating the handle etc. except during manual operation.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is directed to a manual operation device for manually operating an electric actuator that converts the rotational force of an electric motor into a linear motion to move a rod back and forth, and provides the following solution means. It was

That is, the first solution means of the present invention is to provide a worm wheel on the output shaft side of the electric motor for transmitting a rotational force between the output shaft of the electric motor and the output shaft of the electric motor. Further, a worm that rotates around a rotation axis orthogonal to the rotation axis of the worm wheel is meshed with the worm wheel. Further, the present invention is characterized in that a rotating operation means for rotating the worm around its rotating shaft by a manual rotating operation is connected to the rotating shaft of the worm.

A second solving means of the present invention is the first solving means according to the first solving means, wherein the worm is provided so as to be movable along the rotation axis by the moving means, and when the actuator is electrically operated, the worm and the worm wheel are meshed with each other. On the other hand, the feature is that the worm and the worm wheel are engaged with each other during manual operation.

A third solution means of the present invention is the second solution means, wherein the worm is positioned so as not to move in the rotation axis direction by the positioning means at two positions, a meshing position with the worm wheel and a non-meshing position. It is characterized by doing so.

[0010]

With the above structure, in the first solution means of the present invention, when the electric actuator is manually operated, when the rotary operation means is rotationally operated, the worm rotates about its rotation axis, and the rotational force of the worm is increased. The worm wheel is transmitted to the worm wheel to rotate about its rotation axis, and the rotational force of the worm wheel is further transmitted to the output shaft of the electric motor. Then, the rotational force of the output shaft of this electric motor is converted into linear motion, and the rod advances and retreats.

As described above, since the rotational force of the rotating operation means is transmitted not by the engagement of the spur gears but by the engagement of the worm and the worm wheel, the rotational force is transmitted smoothly and the A large reduction ratio can be obtained as compared with the case of using gears, and the rotating operation of the rotating operation means is performed with a light load to facilitate the operation.

In the second solution of the present invention, since the worm does not mesh with the worm wheel except during manual operation, the rotating force of the electric motor of the electric actuator is stopped at the worm wheel during electric operation. Is not transmitted to the worm, and the worm does not rotate. Therefore, the rotation operation means does not rotate, and there is no danger of rotation.

In the third solution of the present invention, the worm is positioned so as not to move in the rotation axis direction at two positions, a meshing position with the worm wheel and a non-meshing position. The meshing is surely made, and the meshing is surely released at the non-meshing position, so that the rotating operation means does not malfunction.

[0014]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a case where the electric actuator A is installed on the turbine for power generation B. The electric actuator A is expanded / contracted to adjust the hydraulic power of the turbine B, and the guide ring 1 connected to the gate shaft 2 is rotated. Then, the opening / closing angle of the guide vane (not shown) is changed and set.

As shown in FIG. 2, the electric actuator A includes an actuator body 3, and in the middle of the actuator body 3, a rotor yoke 5 having a magnet 4 on the outer periphery and the rotor body 5. A servo motor 7 as an electric motor, which is composed of a stator 6 arranged outside the yoke 5, is installed. The rotor yoke 5 of the servo motor 7 has a front end (right end in FIG. 2) side and a base end (right end in FIG. 2) of the actuator body 3. It is rotatably supported by bearings 8 and 9 mounted at two positions on the left side of FIG.

The rotor yoke 5 has an insertion hole 10 in its inside that penetrates to the tip side of the actuator body 3, and a nut 11 is integrally attached to the inner wall of the insertion hole 10. A ball screw portion 12a formed on the base end (left end in FIG. 2) of the rod 12 is screwed into the nut 11 so as to be able to move forward and backward, and the tip end (right end in FIG. 2) side of the rod 12 is the actuator body. The bearing 13 is fitted inside the three tips. The rod 12 is horizontally supported inside the actuator body 3 by the bearing 13 and the nut 11, and the tip is projected from the tip of the actuator body 3 to the outside, and the gate shaft 2 is attached to the tip. ing.

A guide rail 14 is arranged on the inner wall of the tip end side of the actuator body 3, and a slider 15 is movably attached to the guide rail 14. The middle of the rod 12 is attached to the slider 15, and when the rod 12 moves forward and backward, the slider 15 moves along the guide rail 14 to prevent the rod 12 from rotating.

The rotor yoke 5 has a shaft shape at the base end side of the actuator body 3 to form an output shaft 16 of the servomotor 7, and a large diameter first spur gear is provided at the tip of the output shaft 16. A small gear 18a of a resolver 18 for detecting the rotation angle of the first spur gear 17 is meshed with the first spur gear 17.

A first rotating shaft 19 is arranged above the first spur gear 17 in parallel with and in the same direction as the output shaft 16, and the first rotating shaft 19 has the same structure as the first spur gear 17. A small-diameter second spur gear 20 that meshes is fixed, and an electromagnetic brake 21 that stops the rotation of the first rotating shaft 19 is installed on the side of the second spur gear 20.

The electric actuator A configured as described above converts the rotational force of the servomotor 7 into a linear motion by the ball screw portion 12a of the rod 12 and the ball nut 11 to move the rod 12 forward and backward, At this time, the resolver 18 detects the rotation angle of the output shaft 16 to control the position of the rod 12. Further, when an abnormality such as control trouble or power failure occurs, or when the electric actuator A is to be inspected or adjusted, the electromagnetic brake 21 is operated to restrain the rod 12 from moving back and forth.

A free shaft support device 22 is attached to the base end side of the actuator body 3, and the electric actuator A has the free shaft support device 22 mounted on a mount 23 so as to be swingable by a shaft 24. By this, the posture can be changed according to the amount of advance / retreat of the rod 12.

The manual operation device C according to the embodiment of the present invention is installed at the base end of the electric actuator A (actuator body 3), and when a trouble or power failure occurs in the control system, At the time of inspection / adjustment, the manual operation device C is switched to the manual position and the electric actuator A is manually operated.

The manual operating device C is provided with a worm wheel 25 fixed to a first rotary shaft 19 which is the output shaft 16 side of the servomotor 7, and the worm wheel 25 changes its rotational force to a first flat shaft. The rotational force is transmitted between the output shaft 16 of the servomotor 7 via the gear 17 and the second spur gear 20.

As shown in the enlarged view in FIG. 3, a second rotary shaft 26 extending in a direction orthogonal to the first rotary shaft 19 is arranged above the first rotary shaft 19, and the second rotary shaft 26 is provided with a worm. Numeral 27 is guided by a sliding key 28 provided on the second rotary shaft 26 so as to be movable in the axial direction and rotatably mounted around the second rotary shaft 26 about the axis thereof. It is adapted to mesh with the wheel 25 to transmit the rotational force.

A handle 29 as a rotating operation means is integrally connected to one end (the left end in FIG. 3) of the second rotating shaft 26 protruding to the outside, and the worm is manually rotated by the handle 29. 27 is rotated around the second rotation shaft 26.

Also, as shown in FIG. 4, an elongated hole 30 for guide extending parallel to the second rotating shaft 26 is formed in the upper wall of the base end of the actuator body 3, and the elongated hole 30 is formed in the elongated hole 30. The upper end of a guide member 31 that engages with both sides across the upper half of the worm 27 is fitted and inserted from below. Further, one end of the lever 32 is attached to the upper wall of the actuator main body 3 by a support shaft 33, and a long hole 34 is formed in the middle of the lever 32. An end of the guide member 31 projecting from the upper wall of the actuator body 3 is inserted into and attached to the elongated hole 34 by a stopper 35 so as not to come off.

When the electric actuator A is electrically operated, the worm 27 rotates the lever 32 in the clockwise direction in FIG. 4 by using the support shaft 33 as a fulcrum as shown in phantom lines in FIG. As shown by the solid line, the engagement of the worm wheel 25 of the electric actuator A is released, while at the time of manual operation, the lever 32 is rotated counterclockwise in FIG. 4 about the spindle 33 as the fulcrum as shown by the solid line in FIG. As a result, as shown by the solid line in FIG. 3, the worm wheel 25 is moved along the second rotation shaft 26 so as to mesh with the worm wheel 25. Therefore, the guide member 31, the lever 32, the support shaft 33 and the like constitute a moving device 36 as a moving means for moving the worm 27 along the second rotating shaft 26. The lever 32 is rotated while the worm 27 is rotated about the second rotation shaft 26 by rotating the handle 29.

Further, two pin insertion holes 37, 37 are formed in the upper wall of the actuator body 3 at a predetermined interval in the direction of the second rotation shaft 26, while the other end of the lever 32 is positioned. A positioning pin 38 as a means is provided so as to project downward, and the positioning pin 38 is inserted into either one of the pin insertion holes 37, 37 to fix the lever 32, so that the worm 27 moves the worm wheel 25. Positioning is performed by the positioning pin 38 so as not to move in the direction of the second rotation shaft 26 at two positions, that is, a meshing position (position shown by solid line in FIG. 3) and a non-meshing position (position shown by imaginary line in FIG. 3). It is designed to be done.

As described above, in this embodiment, when the handle 29 is manually operated, the rotational force of the handle 29 is transmitted to the output shaft 16 by the engagement of the worm 27 and the worm wheel 25, and the rod 12 is moved forward and backward. Therefore, the rotating force can be transmitted smoothly and with a large reduction ratio as compared with the case where the rotating force is transmitted by meshing the spur gears, and the handle 29 can be operated with a light load. Can be operated easily.

Further, in the above-described embodiment, since the worm 27 is moved to the non-meshing position so as not to mesh with the worm wheel 25 during the electric operation, the rotational force of the output shaft 16 is transmitted. Up to this point, the worm 27 does not rotate, and this can avoid the danger of the handle 29 rotating in the stopped state.

Further, in the above embodiment, the positioning pin 38 of the lever 32 is inserted into either one of the pin insertion holes 37, 37 of the actuator main body 3 so that the worm 27 is brought into a meshing position with the worm wheel 25. Since it is fixed at two positions, the non-meshing position, both can be reliably meshed at the meshing position, and at the non-meshing position, the meshing can be surely released, and the handle 29 Malfunctions can be eliminated.

In the above embodiment, the case where the rotating operation means is the handle 29 is shown. However, as shown in FIG. 5, a box spanner 39a provided at the tip of the electric rotating tool 39 is attached to the handle 29. The worm 27 may be rotated by removably fitting and connecting to the protruding end of the two-rotation shaft 26. In this case, unlike the handle 29 in the above-described embodiment, the electric rotary tool 39 does not rely on human power completely, but the operator manually turns the switch on and off. I understand that it is done through. That is, the manual operation referred to in the present invention has a broad meaning of an operation other than the electric operation of the electric actuator A.

Further, in the above embodiment, the opening / closing angle of the guide vane is changed and set by one electric actuator A, but as shown by the phantom line in FIG. 1, another electric actuator A is set. It may be arranged such that the two are arranged facing each other in a V-shape and the opening and closing angle of the guide vane is changed and set by the synchronous operation of the two electric actuators A, A. Further, as shown in FIG. 6, the rods 12 of the two electric actuators A, A installed facing each other may be arranged in parallel vertically with a predetermined interval.

[0035]

[Effect of device]

 As described above, according to the present invention, the rotating operation means is connected to the rotating shaft of the worm that meshes with the worm wheel on the output shaft side of the electric actuator, and the rotating operation means is manually rotated. Since the worm is rotated about its rotation axis by means of the above, the rotating force of the rotating operation means can be transmitted smoothly and with a large reduction ratio, as compared with the case where the spur gears are meshed, and the rotation of the rotating operation means is increased. The operation can be easily performed with a light load.

According to the second aspect of the present invention, since the worm is moved along the rotation axis so as not to mesh with the worm wheel when the manual operation is not performed, the rotational force of the electric motor is changed to the worm during the electric operation. It is possible to prevent the transmission, and it is possible to avoid the danger caused by the rotation of the rotary operation means.

According to the third aspect of the present invention, the worm is positioned so as not to move in the rotation axis direction at two positions, a meshing position and a non-meshing position with the worm wheel. This can be ensured, and the malfunction of the rotating operation means can be prevented.

[Brief description of drawings]

FIG. 1 is a layout view showing a state in which an electric actuator is installed in a water turbine for power generation.

FIG. 2 is a cross-sectional view of an electric actuator including a manual operation device.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a plan view of a manual operation device portion.

5 is a view corresponding to FIG. 4 when an electric rotating tool is used as a rotating operation means.

FIG. 6 is a layout diagram when two electric actuators are used.

[Explanation of symbols]

 7 Servo Motor (Electric Motor) 12 Rod 16 Output Shaft 19 First Rotation Shaft (Worm Wheel Rotation Shaft) 25 Worm Wheel 26 Second Rotation Shaft (Worm Rotation Shaft) 27 Worm 29 Handle (Rotating Operation Means) 36 Moving Device ( Moving means) 38 Positioning pin (positioning means) 39 Electric rotating tool (rotating operation means) A Electric actuator C Manual operation device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoshi Arai 1-1, Shinmeiwa-cho, Takarazuka-shi, Hyogo Shinmeiwa Industrial Co., Ltd. Industrial Machinery Systems Division (72) Yoshihiro Ikari Shinmeiwa-cho, Takarazuka-shi, Hyogo No. 1-1 Shinmeiwa Industrial Co., Ltd. Industrial Machinery System Division

Claims (3)

[Scope of utility model registration request] 1. A manual operating device for manually operating an electric actuator for converting a rotational force of an electric motor into a linear motion to move a rod back and forth, the electric actuator being provided on an output shaft side of the electric motor and an output shaft of the electric motor. A worm wheel that transmits a rotational force between the worm wheel, a worm that meshes with the worm wheel, and rotates around a rotation axis orthogonal to the rotation axis of the worm wheel; and a worm that is connected to the rotation axis of the worm and that is manually operated. A manual operation device for an electric actuator, comprising: a rotation operation means for rotating the rotary shaft about its rotation axis by a rotation operation by the. 2. The worm is provided so as to be disengaged from the worm wheel when the electric actuator is electrically operated, and movable along the rotation axis by the moving means so as to be engaged with the worm wheel when manually operated. The manual operating device for an electric actuator according to claim 1, wherein: 3. The worm is positioned so as not to move in the direction of the rotation axis by a positioning means at two positions, a meshing position and a non-meshing position with the worm wheel. A manual operation device for the electric actuator described.