JPH0342284Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a mechanism for controlling the stoppage of the power source of an operating device that operates a valve or the like by decelerating rotational power.

(b) Problems to be solved by the prior art and the invention As a conventional mechanism of this type, for example, the one proposed by the present applicant is as shown in Japanese Patent Publication No. 51-26616. That is, in FIG. 9, the valve operating shaft (not shown)
The input shaft 10 is rotated through a gear by the rotation of the input shaft 10.
1 is provided with a male screw, and the male screw has a first restriction piece 105 and a second restriction piece 1 corresponding to the valve opening/closing position.
05' is screwed and fixed. The movable nut member 102 is screwed onto the external thread of the input shaft 100 between these two limiting pieces and moves as the input shaft rotates, and further allows the movable nut member 102 to move and rotate. movement guide 106 that prevents
is provided. Further, the moving nut member 1
02 moves and the first or second limiting piece 105
or 105', these together rotate slightly together with the input shaft, and the movable nut member 102 is moved to the first and second limit positions provided corresponding to the first and second limit positions. switch 1
10 and 110' were actuated via the switch moving piece 108 to stop the power source of the operating device.

Note that 109 is an operating shaft that is the center of operation of the switch operating piece 108, and 112 is a machine frame.

In addition, in the device shown in FIG.
FIG. 11 shows the operating state of the switch in FIG. 0 and FIG. 10.

FIG. 11 is a state diagram when the switch actuating piece 108 operates the switch 110. Thereafter, the nut member 102 is manually rotated until it rotates approximately one rotation (the nut member 102 in FIG. ) and the 12th
When the switch 110 reaches the position shown in the figure, it is in the reset (power source driven) state.

Therefore, the valve is further manually moved to come into contact with the stopper, and the manual handle does not move, making it possible to recognize whether the valve is fully open or fully closed.
Now, in this state, for example, if the power is turned on in the fully closed state, the first fully closed switch will be driven in the closing direction, so the valve will not move and there is a risk that a serious accident may occur, such as the power source seizing up. It was hot.

Also, if the nut member 102 is rotated clockwise further than this including the position shown in FIG. 12 and then reversed,
Although the state returns to the intermediate state shown in FIG. 10, the working relative relationship between the valve operating shaft and the switch remains deviated by one or more rotations of the nut member 102 in FIG. 2.

(C) Purpose The present invention solves the above-mentioned drawbacks, and provides a system in which the nut member contacts the first and second limiting pieces, and even if they rotate together, the valve etc. contacts the stopper and the manual handle does not move. The object of the present invention is to provide a mechanism that leaves a margin so that the nut member does not return the switch to the reset state.

(d) Means for Solving the Problems The present invention is a mechanism for controlling the stoppage of the power source of an operating device that operates a valve or the like using rotational power, and includes an input shaft that is rotated by the rotational power and has a male thread. , which is screwed into the male thread of the input shaft so that the first
and a first limiting piece and a second limiting piece provided corresponding to the second limiting position, and the male thread of the input shaft is screwed between these limiting pieces and moves as the input shaft rotates. comprising a movable nut member and a movable guide that allows the movable nut member to move and prevents rotation, when the movable nut member moves and abuts the first or second limiting piece,
Together, these rotate slightly together with the input shaft, and the movable nut member
In an operating device control mechanism configured to operate first and second switches provided corresponding to restriction positions, a spiral is formed on mutually opposing surfaces of the first and second restriction pieces with the input shaft as the center. The present invention is characterized by comprising: an end face; and a protrusion attached to the movable nut member to engage with the rear end step of the helical end face.

(e) Examples Embodiments of the present invention will be described based on the drawings.

As shown in FIG. 1, this mechanism is a mechanism C that controls the stoppage of a motor M, which is a power source of an operating device A that operates a valve B etc. by decelerating the rotational power. First, the outline of this mechanism is shown in Figs. 2 to 8. The input shaft 7 has a hollow outer shaft 7b with a male thread that is rotated by power.
and the first and second
A first valve-closing restriction piece 11 and a second valve-opening restriction piece 12 are provided corresponding to the restriction positions, and the valve is screwed into the external thread of the hollow outer shaft 7b between these two restriction pieces 11, 12. A moving nut member 13 is provided which moves linearly as the nuts rotate. Furthermore,
It has a moving guide 14 that allows the moving nut member 13 to move and prevents it from rotating. and,
The movable nut member 13 moves linearly to the first
Alternatively, when they come into contact with the second limiting pieces 11 and 12, they are integrally connected and rotate slightly together with the input shaft 7, and the movable nut member 13 is provided corresponding to the first and second limiting positions. The first and second switches 1 and 2 are operated via the passive piece 4 and the operating piece 3.

The input shaft 7 consists of an inner shaft 7a which is rotatably supported via a bearing, and a hollow outer shaft 7b which is rotatably fitted onto the inner shaft 7a and has a male thread in the middle. Shafts 7a and 7b are disk springs 7c
The inner shaft 7a is frictionally coupled via a spring bearing 7d fixed to the inner shaft 7a, and rotates integrally below a set torque value, and above the set torque value, the inner shaft 7a idles relative to the outer shaft 7b.

At both ends of this hollow outer shaft 7b, there is a first restriction piece 11 for closing the valve (left side in FIG. 2) and a second restriction piece 1 for opening the valve.
2 are screwed together and fixed. In these first and second limiting pieces 11 and 12, spiral surfaces 11b and 12b corresponding to one pitch are formed on the mutually opposing surfaces of the cylindrical main bodies 11a and 12a and project around the input shaft 7. As shown in FIG.
c, 12c.

The movable nut member 13 has a female screw screwed into the male screw of the hollow outer shaft 7b at the center of the plate-like body 13a, and a leg having a notch groove 13c on one radial side (lower side in FIG. 4) of the body 13a. The portion 13b is formed into a protrusion 13d on the other side (upper side in FIG. 4), and a pin 13e parallel to the input shaft 7 is inserted and fixed into the protrusion 13d to form protrusions on both sides of the main body 13a. There is.

Further, on both sides of the movable nut member 13, a first plate piece 21 for closing the valve and a second plate piece 22 for opening the valve are provided on one side (lower part of FIG. 3), approaching the member 13 in opposition to each other.
is swingably supported by a moving guide 14.
The moving guide 14 is a rod parallel to the input shaft 7, is fixed to the case D, and is fitted into the notched groove 13c to prevent the moving nut member 13 from rotating. The first plate piece 21 and the second plate piece 22 have notches 21a and 22a on the other side (upper side in FIG. 4) with respect to the side supported by the moving guide 14, and holes 21b and 22b through which the input shaft 7 can be inserted. On the other side, locking protrusions 21c and 22c are provided that protrude toward the centers of the holes 21b and 22b.

As shown in FIG.
(The plate piece 22 is not shown).

Above the movable nut member 13 and the first and second plate pieces 21 and 22 (FIG. 2), the notch 21
A passive piece 4, one end of which fits into the a, 22a, is supported, and the first switch 1 for closing the valve is connected via the passive piece 4.
An actuating piece 3 for actuating the second valve opening switch 2 is swingably provided on the same shaft 6 as the passive piece 4. One end of each of the actuating piece 3 and the passive piece 4 is regulated in posture by a posture holding spring 5 so that they are on the same plane.

Based on the above, the operating state will now be explained.

When the input shaft 7 is rotated to the left in FIG. 3 during electric automatic operation, the inner shaft 7a and the outer shaft 7b rotate together, and the first and second limiting pieces 11 and 12 also rotate together. On the other hand, since the movable nut member 13 is prevented from rotating by the movable guide 14, the first plate piece 21 and the second plate piece 22 can be moved while maintaining the same posture.
At the same time, it is sent to the male thread of the outer shaft 7b toward the first restriction piece 11 for closing the valve, and moves along the movement guide 14. Then, the protrusion 21c of the first plate piece 21 comes into contact with the step part 11c of the first restriction piece 11, and the movement of the plate piece 21 is prevented, and the plate piece 21 The movement guide 14 is rotated slightly as shown in FIG.
Tilt to the left about the axis. Therefore, via the passive piece 4 whose lower end is fitted into the notch 21a of the first plate piece 21,
The operating piece 3 is tilted to the right around the shaft 6, and its upper end pushes the first switch 1 to stop the motor M. The above operations are performed in the same manner even in the case of manual operation in the event of a failure or the like.

Next, when the input shaft is further rotated only manually, the first plate piece 21 is further tilted to the left as shown in FIG. The engagement is disengaged, and the passive piece 4 escapes due to the posture holding spring 5. Meanwhile, the mobile nut 13
Since the male screw 7b in FIG. When the counterclockwise rotation is continued, the protrusion 21c has advanced by the screw lead of the moving nut 13 and the male screw 7b in the first rotation, so the restriction piece 11 is moved again.
It does not fall into the terminal end portion 11c.

That is, even if the shaft 7 is rotated one revolution or more, the switch 1 is not reset. Further, the valve plate (not shown) advances to the ultimate position within the valve and is prevented from advancing further, confirming that the valve is fully closed. If the valve does not have a stopper, if the movable nut member 13 approaches the first restricting piece 11 any further, the stepped portion 11c of the first restricting piece 11 will stop the movable nut member 1.
3, the control piece is prevented from rotating, and the frictional connection between the inner shaft 7a and the outer shaft b by the spring member 7c is removed, and the inner shaft 7a rotates idly. Adjustment of the timing when fully closed depends on the thickness of the plate and the pin 13.
This is done by changing the amount of margin depending on the length such as e.

When the input shaft 7 is reversely rotated to open the valve, the pin 13e of the movable nut 13 is thereby actuated in a direction away from the stepped portion 11c of the first restricting piece 11, and becomes rotatable. Therefore, the movable nut member 13, the first and second plate pieces 21, 22 move toward the second limiting piece 12, and the protrusion 21c of the first plate piece 21 and the first
The relationship between the limiting piece 11 and the stepped portion 11c is the 6th, 5th, and 3rd.
The process returns to the original state through the illustrated sequence. Subsequently, when the input shaft 7 further rotates, the second plate piece 22 is opened.
approaches the second restricting piece 12 and operates in the same manner as described above to control the opening of the valve.

(f) Effects As described above, the present invention can provide the same operating conditions in manual operation as in electric operation.
Even if the vehicle is operated beyond the limits during automatic operation, accidents such as the power source seizing up will no longer occur.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an operating device in which the present invention is used;
Figure 2 is a vertical sectional view showing one embodiment of the present invention;
Figures 4 and 4 are respectively - and - sectional views of Figure 2, Figures 5 and 6 are respectively the operating state of Figure 3, and Figure 7 is the operating state of Figure 4, and Figure 8. 9 is an enlarged perspective view of the main part. FIGS. 9 to 12 are conventional views. 1...Operator, B...Valve, C...Case, M...
...Motor, 1...First switch, 2...Second switch, 3...Operating piece, 4...Passive piece, 5...Posture holding spring, 6...Shaft, 7...Input shaft, 7a... Inner shaft, 7b...Hollow outer shaft, 11...First restriction piece, 1
2... Second restriction piece, 13... Moving nut member, 1
4...Movement guide, 21...First plate piece, 22...
Second plate piece, 31...first plate piece posture holding section.

Claims (1)

[Claims for Utility Model Registration] A mechanism for controlling the stop of the power source of an operating device that operates a valve or the like using rotational power, comprising: an input shaft that is rotated by the rotational power and has a male thread; The first and second portions of the operating device are screwed onto the male thread.
A first limiting piece and a second limiting piece are provided corresponding to the limiting position, and a movable nut member is screwed onto the external thread of the input shaft between these limiting pieces and moves as the input shaft rotates. and a movement guide that allows the movement of the movable nut member and prevents rotation thereof, and when the movable nut member moves and abuts the first or second limiting piece, these act as one body. In the operating device control mechanism, the movable nut member slightly rotates together with the input shaft to operate first and second switches provided corresponding to the first and second limit positions, a helical end surface formed on mutually opposing surfaces of the first and second limiting pieces with the axis as the center; and a protrusion attached to the movable nut member to engage with a rear end step of the helical end surface. A control mechanism for an operating device characterized by: