JPH0495679A - Actuator - Google Patents

Abstract

PURPOSE:To enable manual operation without mismatching one gear with the other in interlocking by moving a drive shaft to an axial direction against the resilience of a spring to allow an engagement protrusion to escape from an engagement groove and the other split gear to unlock with a small gear. CONSTITUTION:A large gear 5 consists of one split gear 5a and the other split gear 5b, split into two with a plane perpendicular to a drive shaft 4, which are integrally formed to interlock with a small gear 3. One split gear 5a is blocked from up-down movement while interlocking with the small gear 3, and a shaft hole 5c is engaged with the drive shaft 4 in a floating state. The other split gear 5b is fixed to the drive shaft 4. An engagement protrusion 6 is fixed to the drive shaft 4, fitted into an engagement groove 5d formed in one split gear 5a and fixed to the drive shaft 4 integrally with the other gear 5b to interlock with the small gear 3. When the drive shaft 4 is pushed down against the resilience of a spring 7 acting on the drive shaft 4 or the other split gear 5b, the engagement protrusion 6 escapes from the engagement groove 5d to make the other split gear 5b unlock with the small gear 3.

Description

[Detailed description of the invention]

"Purpose of invention"

[Industrial application field]

The present invention relates to an actuator device for opening and closing a ball valve, butterfly valve, etc. using an electric actuator with relatively low output torque.

[Conventional technology and its issues]

For valves such as ball valves and butterfly valves, which have a small rotational operating angle and relatively large operating torque, the rotation is slowed down by interlocking a small gear connected to the output shaft of an electric actuator with a large gear fixed to the drive shaft. Actuator devices that increase output shaft torque have been used in the past. However, with conventional actuator devices, when performing manual operation, the drive shaft is moved in the axial direction to disengage the large gear and small gear, and when the drive operation is completed, the large gear and small gear are brought into engagement. , the occlusal position of the gears tends to be out of alignment, which causes the problem that the subsequent fully open and fully closed positions become out of order. Note that if the electric actuator has a shaft for manual operation, it can be used, but this may cause problems such as difficulty in operation due to assembly with the actuator device and large operating rotation angle. It is not desirable to have it. The actuator device of the present invention is intended to solve these conventional problems. "Structure of the invention"

[Means to solve the problem]

In order to achieve the above object, the present invention is configured as follows. An actuator device that engages a small gear connected to the output shaft of an electric actuator and a large gear fixed to the drive shaft to decelerate rotation and increase output shaft torque. The gear is divided into two parts, one of the divided gears is interlocked with the small gear to prevent movement in the axial direction, the shaft hole and the drive shaft are loosely fitted, and the other divided gear is fixed to the drive shaft. , one split gear and the other split gear are integrally fixed to the drive shaft by fitting an engagement protrusion fixed to the drive shaft or the other split gear into an engagement groove formed on one split gear. When the drive shaft is moved in the axial direction against the elastic force of the spring attached to the other split gear or the drive shaft to maintain this state of engagement with the small gear, The engagement protrusion was disengaged from the engagement groove so that the other split gear and the small gear were disengaged. In this case, one end of the drive shaft can be slidably connected only in the axial direction to a driven shaft such as a valve, and the other end is a head for manual operation that indicates the open/close position of the valve etc. It is good to have an indicator installed. [Function] When a manual operation tool, lever, etc. is attached to the other end of the drive shaft and the drive shaft is moved in the axial direction, the engagement protrusion fixed to the drive shaft or the other split gear engages the tooth profile of one split gear. At the same time, the other divided tooth profile and the small gear are disengaged from each other. Next, the drive shaft is rotated using a manual operation tool, and the valve shaft, which is a driven shaft connected to the drive shaft, is rotated to open and close the valve. When the above-mentioned movement in the axial direction is stopped against the elastic force of the spring of the drive shaft, the other split gear or the other split gear or the other split gear is stopped by the elastic force of the spring attached to the spring. The gear moves in a direction in which the other split gear and one split gear become integrated, but the engagement protrusion fixed to the drive shaft or the other split gear fits into the engagement groove formed on one split gear. This movement is only possible in the inset position. Therefore, one split gear and the other split gear are integrated only at this specific position, and the rotational force of the electric actuator can be transmitted to the valve or the like. Note that the shaft hole of one of the split gears is loosely fitted to the drive shaft, and movement in the axial direction is prevented when it is engaged with the small gear, so the drive shaft cannot be moved along the axis for manual operation. Even if the drive shaft is rotated with the engaging protrusion disengaged from the engaging groove, the position of one of the split gears will not change at all in the axial direction and rotational direction. Since one split gear and the other split gear are in an integrated state only at a specific position, the fully open and fully open positions of a valve, etc. determined by a stopper or a position limit switch will not be deviated. In addition, when operating with an electric actuator, the other split gear directly fixed to the drive shaft and the engagement protrusion fixed to the drive shaft or the other split gear fit into the engagement grooves and are indirectly fixed to the drive shaft. One of the divided gears meshes with the small gear, and rotational torque is transmitted from the small gear to the drive shaft. Note that one end of the drive shaft can be connected to a driven shaft such as a valve shaft so that it can slide in the axial direction.
The drive shaft can be moved in the axial direction, and the other end is a head for manual operation, so manual operation with a single manual operation tool is easy. In addition, you can easily know the open and close positions of valves, etc. with the attached indicator. [Example] Next, an example of the actuator device of the present invention will be described based on the drawings. FIG. 1 is a vertical sectional view showing one embodiment of the actuator device of the present invention, and FIG. 2 is a partially cutaway vertical sectional view showing a state where the drive shaft is moved in the axial direction from the state shown in FIG. 1. It is a diagram. In FIGS. 1 and 2, 1 is an electric actuator;
2 is a secondary reduction gear, 3 is a small gear, 4 is a drive shaft, 5 is a large gear, 6 is an engaging protrusion, and 7 is a spring. The pinion 3 is fixed to a pinion shaft 8, the pinion shaft 8 is connected to the output shaft 1a of the electric actuator 1, and the pinion 3 is connected to the output shaft 1a. The large gear 5 consists of one split gear 5a and the other split gear 5b, which are divided into two along a plane perpendicular to the drive shaft 4, and are integrally engaged with the small gear 3. As shown in FIGS. 1 and 2, one split gear 5a is in mesh with the small gear 3, and the - split gear 5
A guide plate 10 fixed to a with screws 9 contacts the upper surface of the small gear 3 and is prevented from moving downward.
Upward movement is prevented by a Spencer ring 11 mounted between the lid 2a of the secondary speed reduction device 2, and the shaft hole 5c is loosely fitted to the drive shaft 4. The other split gear 5b is fixed to the drive shaft 4 by shrink fit or adhesive. The engagement protrusion 6 is fixed to the drive shaft 4, and has a tapered surface at its tip so that it can easily fit into the engagement groove 5d, and is fitted into the engagement groove 5d formed on one of the split gears 5a. Then, one split gear 5a is also fixed to the drive shaft 4 via the engagement protrusion 6 fitted into the engagement groove 5d, and meshes with the small gear 3 integrally with the other split gear 5b. It transmits rotational torque. The spring 7 is installed between the case 2b of the secondary reduction gear 2 and the other split gear 5b, and the elastic force of the spring 7 causes the other split gear 5b to move as shown in FIG. and the drive shaft 4 to which this is fixed is connected to the other split gear 5
b is springing so as to be integrated with one of the split gears 5a. As shown in FIG. 2, when the drive shaft 4 is pushed down as shown in the figure against the elastic force of the spring 7, the engagement protrusion 6 slips out of the engagement groove 5d, and the other split gear 5b and small gear 3 The occlusion becomes dislocated. Further, one end 4a of the drive shaft 4 is connected to a driven shaft 12 such as a valve.
The other end 4b is slidably connected only in the axial direction.
has a head with two parallel surfaces for manual operation. Note that an indicator 514 indicating the open/close position of a valve or the like is a flange for mounting an actuator of the valve or the like. Next, the operation of the embodiment shown in FIGS. 1 and 2 will be explained. A lever handle, which is a manual operation tool, is attached to the other end 4b of the drive shaft 4, and when the drive shaft 4 is moved downward in the axial direction of FIG. 1 as shown in FIG. The engagement protrusion 6 slips out of the engagement groove 5d, and the other split gear 5b and the small gear 3 are disengaged.Next, the drive shaft 4 is rotated with the lever handle, and the valve shaft, etc. connected to it is rotated with the lever handle. The driven shaft 12 is rotated to open and close valves and the like. When the pressing down of the drive shaft 4 is stopped, the other split gear 5b is pushed up together with the drive shaft 4 by the elastic force of the spring 7, and the state shown in FIG. 1 is returned to the position where the engagement protrusion 6 is fitted into the engagement groove 5d. Therefore, the other split gear 5b and one split gear 5a
The relative position where they become one is always constant, and therefore,
The other split gear 5b, which has been disengaged from the small gear 3 for manual operation, always returns to the same engagement position. Note that the shaft hole 5c of one of the split gears 5a is loosely fitted to the drive shaft 4, and movement in the axial direction is prevented in the state of meshing with the /J% gear 3. Even if the drive shaft 4 is moved in the axial direction for operation, or even if the drive shaft 4 is rotated with the engagement protrusion 6 disengaged from the engagement groove 5d,
One of the divided gears 5a does not change its position in the axial direction and rotational direction at all, and as described above, one of the divided gears 5a
and the other split gear 5b are in an integrated state only at a specific position where the engagement protrusion 6 fits into the engagement groove 5d. The position will not go out of order. In addition, when operating with the electric actuator 1, the other split gear 5b directly fixed to the drive shaft 4 and the engagement protrusion 6 fixed to the drive shaft 4 fit into the engagement groove 5d and engage the drive shaft 4. One of the indirectly fixed split gears 5a meshes with the small gear 3, thereby transmitting rotational torque from the small gear 3 to the drive shaft 4. Note that one end 4a of the drive shaft 4 can be slidably connected in the axial direction to a driven shaft 12 such as a valve shaft of a valve, so that the drive shaft 4 can be moved in the axial direction, and other Since the end 4b is a head for manual operation, manual operation using a manual operation tool is easy. "Effects of the Invention" Since the actuator device of the present invention is configured and operates as described above, the following excellent effects can be obtained. ■ Push in the drive shaft and disconnect the drive shaft from the gear train.
Can be operated manually. ■Even if the drive shaft and gear train are disconnected for manual operation, when the drive shaft and gear train are connected again, they will always be connected in the same position as before, and the fully open and fully open positions will not go awry. . ■High output torque can be obtained using a relatively small electric actuator. ■Manual operation tools can be easily attached to the drive shaft, making it easy to know the open/close positions of valves, etc. ■The structure is simple and inexpensive.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing one embodiment of the actuator device of the present invention, and FIG. 2 is a partially cutaway vertical cross-sectional view showing a state in which the drive shaft has been moved in the axial direction from the state shown in FIG. It is. Fig. 1 1...Electric actuator 2...Secondary reduction gear 4...Drive shaft 4b...Other end 5a...One split gear 5b...Other split gear 5c...Shaft Hole 6... Engaging protrusion 13... Indicator 1a... Output shaft 3... Small gear 4a... One end 5... Large gear 5d... Engaging groove 7... Spring patent application Kitazawa Valve Co., Ltd.

Claims (2)

[Claims] (1) An actuator device that decelerates rotation and increases output torque by interlocking a small gear connected to the output shaft of an electric actuator with a large gear fixed to the drive shaft, in which the large gear is arranged on a plane orthogonal to the drive shaft. split the gear into two, one of the split gears is interlocked with the small gear to prevent movement in the axial direction, and the shaft hole and the drive shaft are loosely fitted,
The other split gear is fixed to the drive shaft, and the engagement protrusion fixed to the drive shaft or the other split gear is fitted into the engagement groove formed on one of the split gears, so that the one split gear and the other split gear are connected. is integrally fixed to the drive shaft and meshes with the small gear, and in order to maintain this state, the other split gear or the drive shaft is forced to resist the elastic force of a spring that is installed to spring the other gear. An actuator device characterized in that when the drive shaft is moved in the axial direction, the engagement protrusion slips out of the engagement groove and the other split gear and the small gear are disengaged. (2) One end of the drive shaft can be slidably connected only in the axial direction to a driven shaft such as a valve, and the other end is a head for manual operation to control the open/close position of the valve etc. The actuator device according to claim 1, further comprising an indicator for indicating the actuator.