JPH0547330Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a drive mechanism for causing a shaft such as a valve shaft of a valve to rotate and reciprocate independently.

(Problem to be solved by the invention) Conventionally, as an example of a butterfly valve, the
The one listed in No. 14779 has been developed.

This butterfly valve has a valve seat 40 as shown in FIG.
The lower end side 42 of the valve body 41 facing the valve body 41 is supported by a spherical surface part 43, and the upper end side 44 is slidably supported on the outside of the lower tapered part 45 of the valve shaft 4a. According to the valve structure, the valve stem 4
By lowering the upper end 44 of the valve body 41
can be moved away from the valve seat 40 by swinging in the direction of arrow a. Further, by rotating the valve shaft 4a in the separated state, the valve can be fully opened without sliding the valve body 41 onto the valve seat 40. Such a butterfly valve has the advantage that wear of the valve body 41 and valve seat 40 can be prevented, and the torque required to open and close the valve can be reduced.

Therefore, in order to open and close the valve as described above,
It is necessary to perform the forward and reverse rotation of the valve shaft 4a and the reciprocating motion in the shaft length direction, respectively.

However, in the past, the reality is that no means has been developed to easily drive such a shaft.

In other words, as a drive mechanism for the valve shaft, etc., for example, Jikosho
There is a mechanism described in Publication No. 45-29507, and there are many other executors such as pneumatic cylinders that use cylindrical cams, etc., but all of these only perform rotational movement of the shaft. , or the shaft is reciprocated while rotating, and cannot be applied to the valve shaft drive mechanism shown in FIG. 5 described above.

Therefore, conventionally, as a means for separately rotating and reciprocating the shaft 4a shown in FIG.
The actual situation was that the handles 46 and 47 were individually attached to the shaft 4a by hand. As a result, the operation work became extremely troublesome and complicated, causing problems in workability.

Therefore, an object of the present invention is to provide a drive mechanism with a simple configuration that can independently rotate and reciprocate the shaft to be driven with simple operation. be.

(Means for Solving the Problems) The present invention is constructed to solve the above problems, and includes one end connected to the shaft 4 to be driven, and a spiral cam groove A formed in the peripheral wall. A cylindrical cam 3, a casing 1 that fits and holds the cylindrical cam 3 so as to be slidable in the axial direction and the outer circumferential direction, and a screw inserted into the cylindrical cam 3 and located in the cylindrical cam 3. A rotationally operable operating shaft 6 having a shaft portion 10 formed thereon, and a threaded shaft portion 1 of the operating shaft 6
A screw body 11 is screwed onto the screw body 11 and is provided in a non-rotating state so as to be screw-fed along the axial direction of the cylindrical cam 3 by the rotational movement of the operation shaft 6; It consists of a cam follower 12 that is engaged in a spiral cam groove A of the cylindrical cam 3, and the peripheral wall of the cylindrical cam 3 has a vertical groove part Ba along the axial direction of the cylindrical cam 3 and a horizontal groove part along the outer circumferential direction. A substantially L-shaped cam groove B is separately provided in which the cylindrical cam 3 is prevented from moving back and forth when engaged with the lateral groove portion Bb, and is allowed to rotate. Cylindrical cam 3 when engaged with vertical groove part Ba
This is a mechanism for rotating and reciprocating the shafts of valves, etc., in which a fixed cam follower 5 is engaged, which prevents the rotation of the valve and allows for back and forth movement.

(Function) In the drive mechanism characterized by the above configuration, the cylindrical cam 3 is operated by rotating the operating shaft 6. First, the fixed cam follower 5 is moved to the lateral groove portion Bb of the L-shaped cam groove B. When the operating shaft 6 is located at
When the screw body 11 is rotated, the screw body 11 is in a non-rotating state.
is screw-fed in the longitudinal direction of the cylindrical cam 3. Therefore, the cam follower 1 attached to the screw body 11
2 acts to push the cylindrical cam 3 in the front and back direction, and the cylindrical cam 3 is connected to the fixed cam follower 5 and the horizontal groove part.
Since its back and forth movement is prevented by engagement with Bb, the cylindrical cam 3 only rotates due to the guiding action of the spiral cam groove A into which the cam follower 12 is engaged. As a result, the shaft 4 to be driven performs a rotational motion.

Further, when the fixed cam follower 5 is positioned from the horizontal groove part Bb of the L-shaped cam groove B to the vertical groove part Ba connected thereto by the rotation of the cylindrical cam 3, the vertical groove part Ba
Due to the engagement between the cylindrical cam 3 and the fixed cam follower 5, the rotation of the cylindrical cam 3 is prevented, and the cylindrical cam 3 can be moved in the front-rear direction. Therefore, when the operating shaft 6 is rotated and acted to move the screw body 11 and the cam follower 12 in the front-back direction, the cam follower 12 presses the cylindrical cam 3 in the axial direction, thereby causing the cylindrical cam 3 and the cam follower 12 to move in the longitudinal direction. The shaft 4 to be driven only moves in the axial direction without rotation.

(Example) Examples of the present invention will be described below.

In FIG. 1, 1 is a substantially cylindrical casing, and one end thereof is provided with a flange 2 for attaching the casing 1 to another member. Reference numeral 14 denotes long holes bored in both sides of the casing 1, which are formed along the front-rear direction of the casing 1. A cylindrical cam 3 is slidably fitted into the casing 1, and a shaft 4 to be driven is connected to the front side of the cylindrical cam.

A and A are two spiral cam grooves bored in the peripheral wall of the cylindrical cam 3, and are formed over an angular range of, for example, 90 degrees. B, B are approximately L-shaped cam grooves separately drilled in two grooves on the peripheral wall of the cylindrical cam 3;
As shown in the figure, the vertical groove Ba along the axial direction of the cylindrical cam 3
and a lateral groove Bb that extends along the outer circumferential direction of the cylindrical cam 3 and is continuous with the vertical groove Ba. Further, the lateral groove portion Bb is formed within an angular range of, for example, 90 degrees, similarly to the spiral cam groove A.
A fixed cam follower 5 is screwed onto the side wall of the casing 1 and fixed at a predetermined position, and its tip end is engaged in the L-shaped cam grooves B, B, respectively.

Reference numeral 6 denotes an operating shaft inserted concentrically into the cylindrical cam 3 through a hole 7 formed at the other end of the casing 1, and is rotatably supported by a thrust bearing 8. An operating handle 9 is fixed to the side. Reference numeral 10 denotes a threaded shaft portion formed by threading a male thread onto the outer periphery of the tip end of the operating shaft 6.

Reference numeral 11 denotes a substantially cylindrical screw body having a female screw portion formed on the inner periphery to be screwed into the screw shaft portion 10, and is screwed into the screw shaft portion 10 in a fitted state. 1
Reference numeral 2 denotes a pair of cam followers which are fixed to the threaded body 11 by a shaft 15, and are engaged in the spiral grooves A, A of the cylindrical cam 3, respectively. 1
Reference numeral 6 denotes an engagement pin protruding outward from the cam follower 12, which is connected to the threaded body 11 and the cam follower 12.
is inserted into a long hole 14 in the side of the casing 1 so as not to rotate in the outer circumferential direction of the cylindrical cam 3.

The present embodiment has the above configuration, and its operation will be explained next.

First, in the initial state where the cam follower 12 is located at one end of the spiral cam groove A and the fixed cam follower 5 is located at the end of the lateral groove Bb of the other cam groove B, as shown in FIG. Connect the operating shaft 6 to the screw shaft part 1
Rotate in the same direction as the screw feed direction of 0.

Then, due to the engagement between the elongated hole 14 and the pin 16, the screw body 11, which is in a rotation-stopped state, is moved forward in the direction of the arrow E, but the cylindrical cam 3 is moved forward due to the engagement between the fixed cam follower 5 and the horizontal groove portion Bb. In order to prevent its advancement, the cam follower 12 presses the inner surface 13 of the spiral cam groove A in the direction of the arrow E. This pressing force generates a rotational force in the cylindrical cam 3, and the shaft 4 to be driven rotates.
In this case, since the fixed cam follower 5 and the lateral groove portion Bb slide relative to each other in the outer circumferential direction of the cylindrical cam 3, the rotational movement of the cylindrical cam 3 is not hindered.

In addition, the above-mentioned screw body 11 and cam follower 12
The cylindrical cam 3 rotates 90 degrees due to the forward action of the third
As shown in the figure, when the cam follower 12 reaches the other end of the spiral cam groove A, the fixed cam follower 5 simultaneously moves between the horizontal groove Bb and the vertical groove of the L-shaped cam groove B.
Reach the position where it connects with Ba.

Then, if the operating shaft 6 was still rotated in the same direction as above, the rotation of the cylindrical cam 3 was prevented by the engagement between the fixed cam follower 5 and the L-shaped cam groove B. In this state, the cam follower 12 no longer rotates the cylindrical cam 3 but presses the inner surface 123 of the L-shaped cam groove B of the cylindrical cam 3 forward to move the cylindrical cam 3 forward. It pushes and moves. Moreover, the cylindrical cam 3
When the cylindrical cam 3 moves forward, the vertical groove part Ba moves relative to the fixed cam follower 5 in the axial direction of the cylindrical cam 3, so the cylindrical cam 3 moves forward properly while the rotation of the cylindrical cam 3 is prevented, and Along with this, the driven shaft 4 also moves forward.

Furthermore, if the operating shaft 6 is then rotated in the opposite direction to the forward direction, a force in the backward direction will act on the screw body 11 and the cam follower 12, so that the cam follower 12 will move into the spiral cam groove. The cylindrical cam 3 and shaft 4 are moved back by pressing the inner surface 13a on the other side of A, and thereafter both are rotated 90 degrees in the opposite direction. At this time, as described above, the cylindrical cam 3 and the shaft 4 are individually retracted and reversed by the engagement between the fixed cam follower 5 and the L-shaped cam groove B.

In the above embodiment, the cam grooves A and the lateral grooves Bb are each formed over an angular range of 90 degrees, but the present invention is not limited thereto. In the present invention, the rotation angle of the cylindrical cam 3 and the driven shaft 4 can be freely changed by changing the forming angle (stroke) of the cam groove A and the horizontal groove Bb. It can be changed arbitrarily according to the setting conditions. Similarly, the vertical groove part Ba of the L-shaped cam groove B is
The specific dimensions of the shaft 4 can be changed depending on the amount of reciprocating movement necessary for the shaft 4 to be driven.

In this way, the specific structure of each cam groove A, B of the cylindrical cam 3 can be freely changed in design, and it is not necessarily necessary to provide two cam grooves A, B each as in the above embodiment. For example, even if the spiral cam groove A is a single line, if the cam follower 12 is brought into surface contact with the inner surface of the spiral cam groove A, and the cam follower 12 and the cylindrical cam 3 are in an engaged state due to the surface contact, the intention of the present invention is achieved. This gives you the operational functionality to do so. In short, the cylindrical cam 3 according to the present invention has a spiral cam groove A and a substantially L-shaped cam groove B separately provided on its peripheral wall, and the L-shaped cam groove B is formed on the cylindrical cam 3. It is sufficient that the longitudinal grooves Ba along the axial direction and the lateral grooves Bb along the outer circumferential direction are formed in series.

Further, the cylindrical cam 3 has a drive target shaft 4 at one end thereof.
It is sufficient that the casing 1 is slidably fitted into the casing 1 so as to be able to rotate and reciprocate in the axial direction in a connected state. Regardless of the specific shape of the casing 1, the casing 1 does not necessarily need to cover the entire area of the cylindrical cam 3.

Furthermore, the present invention is not limited to the specific shape or attachment means of the fixed cam follower 5. The fixed cam follower 5 may be a simple pin-shaped member, etc., and is essentially inserted into the L-shaped cam groove B to enable regulation and permission of a predetermined movement of the cylindrical cam 3. It is sufficient if it is provided in a fixed position.

Furthermore, the present invention provides specific mounting manners of the operating shaft 6,
The type of screw, pitch, and dimension of the screw in the screw shaft portion 10 are not limited, and the operating shaft 6 may be operated not only manually but also by an electric motor, for example. In short, it is sufficient that the threaded shaft portion 10 is inserted into the cylindrical cam 3 and is formed at a portion located within the cylindrical cam 3 to which the threaded body 11 is screwed.

Furthermore, the present invention has a screw body 11 and a cam follower 12.
The specific configuration of is not limited as in the above embodiment,
All of these can be freely modified within the scope of the present invention.

In addition, the present invention is not limited to the specific type of shaft 4 to be driven. The present invention is based on the fifth
It goes without saying that the valve shaft 4a of the butterfly valve shown in the figure can be connected to the cylindrical cam 3 to perform rotation and sliding operations, and it is also applicable to a butterfly valve such as the one shown in FIG. 4, for example.

That is, the butterfly valve shown in the figure has one end 22a of a valve shaft 22 connected to a valve body 21 provided facing a valve seat 20 supported in a swingable and rotatable manner.
A second valve shaft 24 having a bulging spherical portion 23 formed on the other end and a drive shaft 25 are connected in series, and the connection between the drive shaft 25 and the second valve shaft 24 is
The second valve shaft 24 and the valve shaft 22 are connected by inserting a pin 27 supported by the drive shaft 25 into an inclined elongated hole 26 drilled in the second valve shaft 24 . It was given to me.

In the butterfly valve, the cylindrical cam 3 of the drive mechanism according to the present invention is connected to the drive shaft 25, and the drive shaft 28 is connected to the drive shaft 25.
By reciprocating, the second valve shaft 24 and the valve shaft 22
The valve body 21 can be attached to and removed from the valve seat 20 by swinging the valve body 20. Also, if the drive shaft 25 is rotated with the valve body 21 separated from the valve seat 20, the valve body 21 can be attached to and removed from the valve seat 20.
1 relative to the valve seat 20, the valve can be opened.

As described above, the drive mechanism according to the present invention can be applied as a mechanism for opening and closing various types of valves, but the present invention is applicable to applications where rotation and reciprocation of the shaft are required to be performed independently. Naturally, it can be used for other purposes as well, and there is no question as to its specific use.

(Effect of the invention) As described above, the present invention provides a spiral cam groove and a substantially L-shaped cam groove on the peripheral wall of the cylindrical cam whose one end side is connected to the shaft to be driven. A cam follower that can be screwed forward by the rotation of the operating shaft is inserted into one cam groove, and a fixed cam follower is inserted into the other approximately L-shaped cam groove, thereby forming an approximately L-shaped cam groove. When the fixed cam follower is located in the horizontal groove of the cylindrical cam, the forward force of the cam follower that engages in the helical cam groove prevents the cylindrical cam from moving back and forth, allowing the cylindrical cam to rotate. When the fixed cam follower is located in the vertical groove of the cam groove, the cylindrical cam is configured to be able to reciprocate by the forward force of the cam follower while the rotational movement of the cylindrical cam is blocked. As a result, it is possible to independently rotate and reciprocate the shaft to be driven, which makes the operation easier compared to the conventional manual method of rotating and reciprocating the shaft to be driven by operating separate handles. This has resulted in a special effect that makes the work extremely simple.

In addition, the present invention consists of a combination mechanism such as an operating shaft equipped with a cylindrical cam and a cam follower, and its structure is extremely simple and easy to manufacture. It is extremely suitable for driving means of equipment.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the drive mechanism according to the present invention, in which A is a front cross-sectional view of the main part, B is a cross-sectional view taken along the line X-X in A, and C is a cross-sectional view along the line -Y line sectional view. FIG. 2 is a perspective view showing an embodiment of the cylindrical cam.
FIG. 3 is a sectional view of main parts showing the operating state. FIG. 4 is a sectional view showing a state in which the butterfly valve is used as a drive mechanism. FIG. 5 is a sectional view showing a conventional example. DESCRIPTION OF SYMBOLS 1... Casing, 3... Cylindrical cam, 4... Drive target shaft, 5... Fixed cam follower, 6... Operating shaft, 10... Threaded shaft portion, 11... Threaded body, 12...
...Come after you.

Claims (1)

[Scope of utility model registration request] A cylindrical cam 3 whose one end side is connected to a shaft 4 to be driven and which has a spiral cam groove A formed in the peripheral wall, and the cylindrical cam 3 is slidably fitted in the axial direction and the outer circumferential direction. A holding casing 1, an operating shaft 6 that is inserted into the cylindrical cam 3 and has a threaded shaft portion 10 formed at a portion located within the cylindrical cam 3 and can be rotated freely, and a threaded shaft of the operating shaft 6. Part 10
A screw body 11 is screwed into the cylindrical cam 3 and is provided in a non-rotating state so as to be threaded along the axial direction of the cylindrical cam 3 by the rotational movement of the operation shaft 6; It consists of a cam follower 12 engaged in a spiral cam groove A of the cam 3,
Moreover, the cylindrical cam 3 is provided on the peripheral wall of the cylindrical cam 3.
A substantially L-shaped cam groove B is separately provided, in which a longitudinal groove part Ba along the axial length direction and a lateral groove part Bb along the outer circumferential direction are connected, and the cam groove B has a groove B that engages with the lateral groove part Bb. A fixed cam follower 5 is engaged, which prevents the cylindrical cam 3 from moving back and forth when it engages with the longitudinal groove part Ba and allows it to rotate. Features a rotation and reciprocating drive mechanism for shafts such as valve shafts.