JPS6017580Y2 - Manual automatic switching operation mechanism for actuators such as valves - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to an improvement of a manual automatic switching operation mechanism for actuators such as valves.

[Prior art]

Actuators that operate valves, etc. by decelerating the output rotation of a rotary power source such as an electric motor or an air motor are equipped with an automatic manual switching operation mechanism in case of adjustment or an accident with the rotary power source, such as a power outage. General.

This type of conventional device reduces the rotation of an electric motor 1 with a gear reduction part 2, as shown in FIG. 1-1 as an external plan view and as shown in FIG. 1-2 as a side view. In order to transmit the transmission, the clutch wheel, which is slidably fitted to the spline portion provided on the drive shaft, is moved to the right by the lever 3 and connected to the gear of the gear reduction unit 2, and then , a worm wheel that engages with a worm fixed to the rotating shaft of the handle 4 is rotatably mounted on the drive shaft, the clutch wheel is moved to the left by the lever 3, and connected to the wall wheel;
The transmission path from the electric motor 1 is cut off, and the drive shaft can be manually rotated using a handle 4.

Of course, the manual automatic switching operation mechanism described above is just one example, and various other mechanisms are available, but all of them require a manual switching lever 3, a handle 4, and an internal mechanism operated by them. Therefore, the actuator becomes longer by the illustrated length 1, and the switching operation between manual and automatic operation cannot be performed with a single touch operation.

〔the purpose〕

This invention aims to eliminate the above-mentioned drawbacks in the manual automatic switching operation mechanism for actuators such as valves, and has a compact one-touch operation mechanism that takes safety into account when switching between automatic and manual switching. The purpose is to provide an operating mechanism.

[Structure precepts]

The manual automatic switching operation mechanism for actuators such as valves according to this invention is connected to the output shaft of the prime mover for driving the opening/closing valve via a small worm reduction mechanism, and connected to the opening/closing valve shaft via a large worm reduction mechanism. The small worm wheel of the small worm reduction mechanism is slidably engaged with the intermediate drive shaft which is connected to the intermediate drive shaft and is rotatably supported by the casing of the actuator via a spline or a sliding key. Keyway at the end of the extension shaft,
A flange portion is provided on each of the extension boss portions of the small worm wheel, and a manual knob having a shaft portion that includes the flange portion of the small worm wheel and the extension shaft portion of the intermediate drive shaft is rotatably and slidably attached to the intermediate drive shaft. supported on the casing of the actuator concentrically with the drive shaft;
Furthermore, the shaft portion of the manual knob is provided with a pull-out pin that engages with the flange portion of the small worm wheel and a drive pin that engages with the keyway at the end of the extended shaft of the intermediate drive shaft.

Therefore, by pulling out the manual knob, the small worm wheel is pulled out via the extraction pin;
By releasing the coupling between the small worm wheel and the small worm, the power transmission path with the prime mover can be cut off.

By engaging the drive pin with a keyway at the end of the extended shaft of the intermediate drive shaft, the intermediate drive shaft can be manually rotated by the manual knob.

〔Example〕

Hereinafter, embodiments of this invention will be described in detail with reference to the drawings.

Fig. 2 is a side view showing a main part of an actuator for a butterfly valve equipped with this device, for example, in a partially sectional view;
The figure is a cross-sectional view of the ■-■ section viewed in the direction of the arrow.

In the figure, 1 is an electric motor, 11 is a worm fixed to its output shaft, 12 is a worm wheel that meshes with it, and is slidably fitted to an intermediate drive shaft (worm) 13, and 14 is an intermediate drive from the worm wheel 12. Axis 13
It is a sliding key that transmits torque to.

15 is a sector worm wheel that meshes with the worm 13; 16 is a drive unit integrated with the sector worm wheel 13; and a drive sleeve 17 with a square hex that fits with the square end of the valve shaft of a rival valve, for example, is connected to a spring pin (both (not shown) and
Reference numeral 18 denotes a mount base for fixing the valve yoke of the butterfly valve, and is attached to the main body casing 19 with bolts.

20 is a manual knob, and the thick shaft part is attached to the main body casing 19
The wall wheel 12 is slidably and rotatably attached to the wall wheel 12, and the thick left half of the shaft is provided with a cut-out inner cylinder part, and the extended boss part of the wall wheel 12 is accommodated in the large inner cylinder part.
The small inner cylindrical portion accommodates the extended shaft portion of the intermediate drive shaft 13.

21 is a pull-out pin, and 22 is a drive pin, both of which are driven into the thick shaft portion of the manual knob 20 in the radial direction.

When the manual knob 20 is pulled out to the right, the pull-out pin 21 hooks the flange of the extension boss portion of the worm wheel 12, slides the worm wheel 12 along the intermediate drive shaft 13, and pulls out the worm wheel 12 to the right. It works when the mesh with 11 is removed.

Of course, at this time, the troughs of the teeth of the worm wheel 12 are prevented from interfering with the tops of the threads of the worm 11.

A key-shaped groove portion 23 is provided in the stepped end portion of the extended shaft end portion of the intermediate drive shaft 13 symmetrically with respect to a pair of axes.

Therefore, when pulling out the manual knob 20 as described above, by turning it gently, the drive pin 22 can be pulled out from the groove 2.
It is designed so that it can be inserted into 3.

That is, the drive pin 22 fitted into the groove 23 functions to connect the manual knob 20 and the intermediate drive shaft 13.

24 and 25 are annular grooves each having a slope on one side provided on the outer periphery of the thick shaft of the manual knob 20;
When the manual knob 20 is pushed to the left as shown in FIG. In response to a certain amount of force, it is fixed in the pushed position.

When pulling out the manual knob 20 to the right against the restraining force caused by the engagement between the ball 26 and the annular groove 24,
The ball 26 is pushed out of the groove by the slope of the groove 24, and the drive pin 22 can be engaged in the groove 23 at the end of the intermediate drive shaft 13 as described above, while at the same time the ball 26 is pushed out of the groove.
6 is fitted into the annular groove 25 to lock the manual knob 20 in the drawn out position.

Reference numeral 27 denotes a stopper, which is attached to the main body casing 19 so as to be adjustable. When both the left and right end surfaces of the sector worm wheel 15 come into contact with the ends of the stopper 27, the torque limit switch 28 is activated. 1 is stopped.

Next, the operation of this device will be explained.

As mentioned above, let us take as an example a case where a butterfly valve is attached to this actuator, and the valve shaft is manually rotated to adjust the opening degree of the butterfly valve.

Second. Figures 3 and 3 show a state in which the manual knob 20 is pushed to the left, the worm 11 and the worm wheel 12 are engaged, the ball 26 is fitted into the annular groove 24, and the electric motor 1 is in automatic operation. It shows.

Therefore, in order to rotate the valve stem of the butterfly valve by manual operation, switch to the manual operation position by pulling out the manual knob 20 to the right as described above, hooking the worm wheel 12 on the pull-out pin 21, and then Slide it along the drive shaft 13, disconnect the worm 11, and then move the drive pin 2.
2 by engaging the key-shaped groove 23 at the end of the intermediate drive shaft 13.

Even when the manual knob 20 is pulled out for switching to manual operation, the operation can be performed safely without exposing anything other than the manual knob 20 to the outside.

At the same time as connecting the intermediate drive shaft 13 and the manual knob 20, the ball 26 is fitted into the annular groove 25 and the manual knob 20 is connected.
is held in the manual operating position.

Then, if you keep turning the manual knob 20 clockwise or counterclockwise without releasing your hand, if the worm 13 has a right-hand thread, the valve stem will turn clockwise or counterclockwise when viewed from above. Each can be manually rotated clockwise, and the positioning limit switch (not shown) and stopper 27 can be adjusted according to the desired opening degree of the butterfly valve.

To perform automatic operation after performing manual adjustment in this way, push the manual knob 20 to the left in the opposite direction to the above to engage the ball 26 and the annular groove 25, and then tighten the drive pin. 22 and the key-shaped groove at the end of the intermediate drive shaft 13, press the flange end face of the extension boss part of the worm wheel 12 left and right with the stepped surface of the large inner cylinder part of the manual knob 20. Then, the ball 26 is in the annular groove 2.
All you have to do is match it to 4.

In this case, by gently turning the manual knob 20 while pushing in, the worm wheel 12 can be properly engaged with the worm 11 as shown in FIG. 3.

Manual switching is performed in this way, and the worm 11 is
When the actuator and the worm wheel 12 are engaged with each other, the valve shaft is rotated by the electric motor 1 of the actuator, and the butterfly valve can be automatically opened and closed at a desired opening degree.

Although not a component directly related to this invention, this actuator incorporates a torque limiter mechanism that regulates the torque transmitted to the drive sleeve 17 to a constant level, and in order to operate it, the torque limiter mechanism is installed at both ends of the worm 13. A plurality of disc springs are attached in contact with the support ball bearing, and the axial position of the intermediate drive shaft 13 is maintained within a certain range via the disc springs, so that the intermediate drive shaft 13 is , the disc spring is moved left and right by the amount of deflection caused by the axial thrust generated by the meshing of the two sets of worm wheels.

Therefore, although the actuator 12 is slidably fitted to the intermediate drive shaft 13, the friction existing therebetween causes the worm wheel 12 to move slightly to the right or left as the intermediate drive shaft 13 moves. Therefore, the strength of the coil spring that biases the ball 26 is limited by the strength of the coil spring that biases the ball 26 in the axial direction of the manual knob 20 due to the engagement between the ball 26 and the annular groove 24. The binding force must be sufficient to sufficiently suppress movement of the worm wheel 12.

The configuration of this device has been explained above using an actuator for driving a butterfly valve as an example. However, the drive sleeve 17 is configured to hold a nut that is screwed into the valve opening/closing screw shaft of the valve, and the sector worm wheel 15 is Even if the worm wheel is rotatably driven through a hollow output shaft and used to drive a gate valve, this device can be assembled as is.

〔effect〕

As is clear from the above explanation, in the manual/manual automatic switching operation mechanism for actuators such as valves according to this invention, automatic operation can be switched by pushing in a manual knob instead of a manual knob or clutch switching lever. By pulling it out, the power transmission path is cut off, and by rotating the manual knob in this state, the automatic manual operation is switched to manual operation.The automatic manual operation is a one-touch operation method, so the operation is different from that of conventional devices. It is easier to operate than the conventional switching mechanism, and all of the components of this switching operation mechanism, except for the manual knob, are housed in the actuator casing, so they cannot be exposed to the outside even when the manual knob is pulled out. Therefore, there is no risk of fingers getting caught when switching to manual mode, and since the power transmission path of the prime mover is cut off during manual operation, even if the motor is energized, the motor will simply idle, and manual operation will not be possible. can be carried out safely, and is of great benefit for actuators such as valves, which require little extra space for their installation.

[Brief explanation of the drawing]

Fig. 1-1 is an external plan view of an actuator equipped with a conventional manual/automatic switching operation mechanism, Fig. 1-2 is an external side view thereof, and Fig. 2 is an actuator equipped with a device according to this invention, for example, an actuator for a butterfly valve. FIG. 3 is a side view showing a main part of the actuator in a partial sectional view, and FIG. 1... Electric motor, 11... Worm, 1
2...Small worm wheel, 13...
・Intermediate drive shaft (worm), 14...Sliding key, 15...Sector worm wheel, 16
... Drive section, 17 ... Drive sleeve, 19 ... Main body casing, 20 ...
・Manual knob, 21... Pull-out pin, 22...
. . . Drive pin, 23 . . . Key-shaped groove portion, 24.
25...Annular groove, 23...Ball.

Claims (1)

[Scope of Claim for Utility Model Registration] ■ The output shaft of the prime mover for driving the opening/closing valve is connected via a small worm reduction mechanism, the valve shaft for opening/closing is connected via a large worm reduction mechanism, and the output shaft of the prime mover for driving the opening/closing valve is connected via a large worm reduction mechanism, and The small worm wheel of the small worm reduction mechanism is slidably engaged with the rotatably supported intermediate drive shaft via a spline or a sliding key, and the small worm wheel of the small worm reduction mechanism is slidably engaged with the extended shaft end of the intermediate drive shaft. A keyway is provided in each of the extension boss portions of the small worm wheel, and a manual knob having a shaft portion that includes the flange portion of the small worm wheel and the extension shaft of the intermediate drive shaft is rotatably and slidably provided. A pull-out pin and an extended shaft end portion of the intermediate drive shaft are freely supported on the casing of the prepack actuator concentrically with the intermediate drive shaft, and are further provided on the shaft portion of the manual knob to engage with the flange portion of the small worm wheel. A manual and automatic switching mechanism for actuators such as valves, which is equipped with a drive pin that engages with a keyway. 2. The manual knob has two annular grooves at predetermined positions on the outer peripheral surface of the shaft, and a ball that is biased by a spring against the inner wall of the casing of the actuator on which the shaft of the manual knob slides and engages with the annular groove. A manual automatic switching operation mechanism for an actuator such as a valve according to claim 1, wherein the manual knob is held in a pulled out position and a pushed in position.