JP3430198B2 - Two-axis rotating device with one operation axis - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-axis rotating device having a single operating shaft suitable for an opening / closing device for a butterfly valve with a built-in auxiliary valve. 2. Description of the Related Art As shown in FIGS. 7 to 9, a butterfly valve with a built-in sub-valve includes a valve box 1, a main valve body 2 which is openably and closably housed in the valve box 1, and a main valve. A sub-valve body 3 is provided in the body 2 so as to be openable and closable. An upper valve rod 4 and a lower valve rod 5 are fixed to the main valve body 2. The upper valve stem 4 is a cylindrical member provided with a through hole 6 in the direction of the axis C, and is rotatably and air-tightly supported around the axis C by the upper shaft support 7 of the valve box 1 so as to be above the upper shaft support 7. It is protruding. The lower valve stem 5 is rotatably and airtightly supported around the axis C by the lower shaft support portion 8 of the valve box 1, and the upper valve stem 4 and the lower valve stem 5 rotate in the normal and reverse directions around the axis C. The main valve body 2 opens and closes the passage of the valve box 1. An upper valve rod 9 and a lower valve rod 10 are fixed to the sub-valve element 3, and the upper valve rod 9 is rotatable about an axis C by an upper shaft support 12 of an auxiliary valve box 11 provided on the main valve element 2. And is airtightly supported and protrudes above the upper shaft support 12. The lower valve stem 10 is rotatably and air-tightly supported around an axis C by a lower shaft support portion 13 of the sub-valve case 11. A shaft 14 having an upper end protruding above the upper valve rod 4 is inserted through a through hole 6 provided in the upper valve rod 4 of the main valve body 2 in the direction of the axis C so as to be rotatable about the axis C. , This axis 14
And the upper end of the upper valve rod 9 of the sub-valve 3 are connected to each other via a coupling 15 so as to be able to rotate simultaneously. [0005] A biaxial rotating device 17 is mounted on the upper shaft support 7 of the valve box 1 via a stand 16. The two-axis rotating device 17 uses the two operation shafts 18 and 19 to rotate the main valve body 2.
A first gear case 20 having an axis concentric with the axis C, and a first gear case 20 having an axis concentric with the axis C. A lower end of the first gear case 20 is fixed to the stand 16, and an upper end opening of the first gear case 20 is detachably closed by a cover 22. The one operating shaft 18 is connected to the upper valve rod 4 of the main valve body 2.
To rotate in the forward and reverse directions around the axis C,
As shown in FIGS. 10 and 11, the second gear case 21
Is rotatably and airtightly supported around an axis C1 by a shaft support portion 23 provided at one end thereof, and protrudes above the shaft support portion 23. The rotation of one operation shaft 18 around the axis C1 is performed by a bevel pinion 24A, It is transmitted to a horizontal worm shaft 25 via a gear train 24 such as a bevel gear 24B, a pinion 24C, a spur gear 24D, and the like.
Is rotated via a worm 26 provided on the worm shaft 25 through a worm wheel 27 having an axis concentric with the axis C.
Is transmitted to The worm wheel 27 is fixed to a wheel boss 28 rotatably supported around the axis C by the first gear case 20 and the cover 22, and a central hole 28 </ b> A of the wheel boss 28 is provided at an upper end of the upper valve rod 4 of the main valve body 2. And are coupled so as to be simultaneously rotatable by, for example, a key (not shown). The other operating shaft 19 is for rotating the upper stem 9 of the sub-valve 3 in the forward and reverse directions around the axis C via the shaft 14 and the coupling 15, as shown in FIG. , Which is rotatably and air-tightly supported around an axis C by a stem cover 29 which detachably closes a center hole 22A of the cover 22 and protrudes above the stem cover 29, and is provided on the other operation shaft 19. The upper end of the shaft 14 is fitted into the blind through-hole 30 in the direction of the axis C, and is coupled to be rotatable simultaneously by, for example, a taper pin (not shown). In the above construction, the main valve body 2 and the sub-valve element 3 are fully opened from the valve-closing state of the sub-valve built-in type butterfly valve in which the main valve element 2 and the sub-valve element 3 are fully closed. The procedure for obtaining the open state of the butterfly valve will be described. First, the other operation shaft 19 is rotated in the valve opening direction (for example, counterclockwise on the projection plane). This rotation is transmitted to the upper valve rod 9 of the sub-valve 3 via the shaft 14 and the coupling 15, and simultaneously rotates the upper valve rod 9, the sub-valve 3 and the lower valve rod 10 in the valve opening direction. The sub-valve 3 can be fully opened. When the differential pressure between the upstream side and the downstream side of the valve box 1 becomes small due to the full opening of the sub-valve element 3, the one operating shaft 1
8 is the valve opening direction (for example, counterclockwise on the projection plane)
Rotate to. This rotation is transmitted to the upper valve stem 4 of the main valve body 2 through a gear train 24 such as a bevel pinion 24A, a bevel gear 24B, a pinion 24C, a spur gear 24D, a worm shaft 25, a worm 26, a worm wheel 27, and a wheel boss 28. By rotating the upper valve stem 4, the main valve stem 2 and the lower valve stem 5 simultaneously in the valve opening direction, the main valve stem 2 can be fully opened. Next, the main valve body 2 and the sub-valve element 3 are fully closed from the valve-open state of the sub-valve-incorporated type butterfly valve in which the main valve element 2 and the sub-valve element 3 are fully opened. The procedure for obtaining the closed state of the butterfly valve will be described. First, one operation shaft 18 is rotated in a valve closing direction (for example, clockwise on a projection plane). This rotation is transmitted to the upper valve stem 4 of the main valve body 2 through a gear train 24 such as a bevel pinion 24A, a bevel gear 24B, a pinion 24C, a spur gear 24D, a worm shaft 25, a worm 26, a worm wheel 27, and a wheel boss 28. ,
The upper valve stem 4, the main valve body 2 and the lower valve stem 5 can be simultaneously rotated in the valve closing direction to fully close the main valve body 2. After the main valve body 2 is fully closed, the passage of fluid from the upstream side to the downstream side of the valve box 1 is greatly restricted, and then the other operation shaft 19 is moved in the valve closing direction (for example, clockwise on the projection plane). Around). This rotation is transmitted to the upper valve rod 9 of the sub-valve 3 via the shaft 14 and the coupling 15, and simultaneously rotates the upper valve rod 9, the sub-valve 3 and the lower valve rod 10 in the valve closing direction, The sub-valve 3 can be fully closed. As described above, in the butterfly valve with a built-in sub-valve, the operation order of the main valve body 2 and the sub-valve body 3 from the valve closed state to the valve open state is as follows. Opening of the sub-valve body 3 by rotating the other operation shaft 19,. The operation of the main valve 2 and the sub-valve 3 from the valve open state to the valve closed state is performed by opening the valve of the main valve body 2 by rotating one of the operation shafts 18. The valve closing of the main valve body 2 by the rotation operation of one operation shaft 18,. This is performed by closing the valve of the sub-valve body 3 by rotating the other operation shaft 19. [0015] Therefore, in the conventional two-shaft rotary device having two operating shafts, each time the main valve and the sub-valve are opened and closed, two operating shafts are required. The shaft must be rotated in the specified direction to open or close the valve, which has the disadvantage of cumbersome operation, and improper operation increases the operating force when opening and closing the valve significantly. Therefore, there is a problem that smooth opening and closing of the valve are hindered. Accordingly, the present invention provides a method of automatically rotating two axes based on an appropriate operation order simply by specifying the rotation direction of one operation axis without considering the operation order. It is an object of the present invention to provide a two-axis rotating device using one operation shaft, which can facilitate the operation and can avoid an erroneous operation sequence. In order to achieve the above object, a two-axis rotating device with one operating shaft according to the present invention is provided.
A two-axis system in which two axes, a main shaft and a sub-shaft inserted through the main shaft along the main shaft axis, are rotated around the main shaft in an order specified in the normal and reverse directions around the main shaft by rotation of one operation shaft. A rotating device, which is provided so as to be able to rotate simultaneously with the main shaft, and has a main shaft side first gear provided with a non-meshing portion at a front end portion in a first rotation direction; A countershaft-side first gear, which is provided on the countershaft so as to be rotatable at the same time and has a non-meshing portion at a rear end portion in the first rotation direction, and a main shaft-side first gear meshable with the main shaft-side first gear; Two gears, a countershaft-side second gear that can mesh with the countershaft-side first gear, and one connecting portion provided on the main shaft-side first gear;
The one connection is provided on the countershaft-side first gear while the countershaft-side first gear rotates from the start position in the first rotation direction to near the rotation end position due to the rotation of the countershaft-side second gear. While not interfering with the portion, while rotating from the vicinity of the rotation end position in the first rotation direction to the rotation end position, it interferes with the one connecting portion to cause the main shaft side first gear to initially mesh with the main shaft side second gear, Reverse rotation of the main shaft side second gear causes the main shaft side first gear to rotate.
While the gear rotates from the start position in the second rotation direction to the vicinity of the rotation end position, the gear does not interfere with the one connecting portion,
The other connecting portion that interferes with the one connecting portion and initially meshes the countershaft-side first gear with the countershaft-side second gear while rotating from near the rotation end position to the rotation end position in the rotation direction; provided on the side first gear interferes with the spindle-side first gear in the rotational end position of the first rotational direction of the sub axis side first gear, the main shaft side first gear rotational end position of the first rotational direction A first stopper that is stopped at the first shaft and a first gear that is provided on the main shaft side, interferes with the first shaft gear on the sub shaft side at the rotation end position of the first gear on the main shaft side in the second rotation direction, and A second stopper for stopping the gear at a rotation end position in the second rotation direction; and one operating shaft for simultaneously rotating both the main shaft side second gear and the counter shaft side second gear via an input transmission mechanism. It is characterized by having. According to the present invention, the rotation of one operation shaft is transmitted to both the main shaft side second gear and the counter shaft side second gear via the input transmission mechanism, and these are rotated simultaneously. If these rotation directions are directions for rotating the main shaft side first gear and the counter shaft side first gear at the start position in the first rotation direction, the rotation of the counter shaft side second gear causes the counter shaft side first gear. Rotate in the first rotation direction. In this case, since the main shaft side first gear provided with the non-meshing portion at the front end in the first rotation direction is not meshed with the main shaft side second gear, the rotation of the main shaft side second gear is transmitted to the main shaft side first gear. However, the main shaft-side first gear is stopped. While the first countershaft side gear rotates from the start position to the vicinity of the rotation end position, the other connecting portion provided on the first countershaft side gear is connected to one connecting portion provided on the first main shaft side gear. Since there is no interference, the rotation of only the countershaft-side first gear in the first rotation direction is continued. While the countershaft-side first gear reaches near the rotation end position in the first rotation direction and rotates from there to the rotation end position, the other connecting portion interferes with one of the connecting portions. Then, the first main-shaft-side gear is slightly rotated in the first rotation direction to initially mesh with the second main-shaft-side gear. Immediately after the start of the initial meshing, the non-meshed portion at the rear end in the first rotation direction provided on the countershaft-side first gear corresponds to the countershaft-side second gear, and the countershaft-side first gear is the first gear.
Stop at the rotation end position in the rotation direction. After the main shaft side first gear meshes with the main shaft side second gear, the main shaft side first gear is rotated by the rotation of the main shaft side second gear.
When the gear rotates in the first rotation direction and interferes with the first stopper provided on the countershaft-side first gear, the main shaft-side first gear stops at the rotation end position in the first rotation direction. On the other hand, the rotation direction of the main shaft side second gear and the counter shaft side second gear due to the rotation of one operating shaft is such that the main shaft side first gear and the counter shaft side first gear at the start position are moved in the second rotation direction. In this case, the rotation of the main shaft side second gear causes the main shaft side first gear to rotate in the second rotation direction. In this case, the countershaft-side first gear provided with the non-meshing portion at the rear end in the first rotation direction corresponding to the front end in the second rotation direction is not meshed with the countershaft-side second gear. The rotation of the side second gear is not transmitted to the countershaft side first gear, and the countershaft side first gear is stopped. While the main shaft side first gear rotates from the start position to the vicinity of the rotation end position, one connecting portion provided on the main shaft side first gear interferes with the other connecting portion provided on the sub shaft side first gear. Therefore, the rotation of only the main shaft-side first gear in the second rotation direction is continued. While the main shaft side first gear reaches near the rotation end position in the second rotation direction and rotates from there to the rotation end position, the one connecting portion interferes with the other connecting portion. Then, the countershaft-side first gear is slightly rotated in the second rotation direction to initially mesh with the countershaft-side second gear. Immediately after the start of the initial meshing, the non-meshed portion at the front end in the first rotation direction corresponding to the rear end in the second rotation direction provided on the main shaft side first gear corresponds to the main spindle side second gear, The first gear stops at a rotation end position in the second rotation direction. After the countershaft-side first gear is initially meshed with the countershaft-side second gear, the rotation of the countershaft-side second gear causes the countershaft-side first gear to rotate.
When the gear rotates in the second rotation direction and interferes with the second stopper provided on the main shaft-side first gear, the sub-shaft-side first gear stops at the rotation end position in the second rotation direction. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings, in a form applied to an opening / closing device for a butterfly valve with a built-in sub-valve in the same manner as in the prior art. Therefore, the structure of the valve box 1, the main valve body 2, the sub-valve body 3, the upper valve rods 4, 9, the lower valve rods 5, 10, the shaft 14 and the like are the same as those of the conventional example. The same or corresponding parts as those in the conventional example of FIGS. 8 to 11 are denoted by the same reference numerals. FIG. 1 is an exploded plan view showing an embodiment of the present invention, FIG. 2 is a plan view of an assembled state, and FIG. 3 is a view taken along the line AA of FIG. In these figures, the two-axis rotating device 17
Are the first sector worm wheel 31, the second sector worm wheel 32, and the first sector worm wheel 3
A first worm 33 meshable with the first worm wheel 33 and a second worm 34 meshable with the second sector worm wheel 32
And one connecting portion 35 provided on the first sector worm wheel 31, the other connecting portion 36 provided on the second sector worm wheel 32, a first stopper 37, a second stopper 38, and an input transmission mechanism 39. And one operating axis 4
0. The spirals of the first worm 33 and the second worm 34 are set in opposite directions. The first sector worm wheel 31 has a first worm 3 at its front end in the valve opening direction (first rotation direction) R1.
The non-engagement portion 31A with the center hole 31 is provided without being provided.
B is fitted with the upper end portion of the upper valve rod 4 of the main valve body 2 and connected to be rotatable simultaneously by, for example, a key (not shown). The second worm wheel 32 has a second worm 3 at the rear end of the valve opening direction (first rotation direction) R1.
The non-meshing portion 32A with the center hole 32 is provided so as to be missing.
B is fitted with the upper end of the shaft 14 and is coupled to be rotatable simultaneously by, for example, a key (not shown). One connecting portion 35 is formed by a pin projecting upward at a position separated by a distance r from the center of the center hole 31B in the first sector worm wheel 31, and the other connecting portion 36 is formed by a second sector worm. It is formed by an arc-shaped notch having a radius corresponding to the distance r from the center of the center hole 32B in the wheel 32 and having a radial dimension slightly larger than the diameter of the one connecting portion 35. For this reason, the second sector worm wheel 32 is positioned above the first sector worm wheel 31,
By causing the two to face each other, one connecting portion 35 is inserted into the other connecting portion 36. The relative relationship between one connecting portion 35 and the other connecting portion 36 is described below. The second sector worm wheel 32 is rotated from the start position (the position in FIG. 2) in the valve opening direction R1 by the rotation of the second worm 34. During the rotation to the vicinity of the rotation end position, the one linking portion 35 does not interfere, and the valve opening direction R1
While rotating from the vicinity of the rotation end position to the rotation end position, the first sector worm wheel 31 is initially meshed with the first worm 33 by interfering with the one connecting portion 35,
While the first worm wheel 31 rotates from the start position in the valve closing direction (second rotation direction) R2 to near the rotation end position due to the reverse rotation of the first worm 33 described later,
The second sector worm wheel 32 is initialized by the second worm 34 without interfering with the one connecting portion 35 and interfering with the one connecting portion 35 during rotation from the vicinity of the rotation end position in the valve closing direction R2 to the rotation end position. It is set to engage. The first stopper 37 is provided to extend downward on the front end face of the second sector worm wheel 32 in the valve opening direction R1, and the second stopper 38 is provided on the rear end face of the first sector worm wheel 31 in the valve opening direction R1. It is provided extending upward. The input transmission mechanism 39 includes an intermediate gear 39A fixed to the tip of one operation shaft 40 and a first worm 33.
A first gear 39B fixed to one end of the second worm 34 and meshing with the intermediate gear 39A, and a second gear 39C fixed to one end of the second worm 34 and meshing with the intermediate gear 39A. A procedure for fully opening the main valve body 2 and the sub-valve element 3 from the closed state of the butterfly valve with a built-in sub-valve in which the main valve element 2 and the sub-valve element 3 are fully closed will be described. . The rotation of one operation shaft 40 is controlled by the rotation of the intermediate gear 39.
A, is transmitted to both the first worm 33 and the second worm 34 via the input transmission mechanism 39 composed of the first gear 39B and the second gear 39C, and rotates them simultaneously. If these rotation directions are directions for rotating the first sector worm wheel 31 and the second sector worm wheel 32 at the start positions shown in FIG. 2 in the valve opening direction (first rotation direction) R1, the second worm 34 will be described. Second by rotation of
The sector worm wheel 32 rotates in the valve opening direction R1. In this case, the non-meshed portion 31A is attached to the front end in the valve opening direction R1.
Is not engaged with the first worm 33, the rotation of the first worm 33 is not transmitted to the first sector worm wheel 31, and the first sector worm wheel 31 is stopped. While the second sector worm wheel 32 rotates from the start position to the vicinity of the rotation end position, an arc-shaped notch (the other connecting portion) 36 provided in the second sector worm wheel 32 is connected to the first sector worm wheel 31. Does not interfere with the pin (one connecting portion) 35 provided at
The rotation of only the sector worm wheel 32 in the valve opening direction R1 is continued. While the second sector worm wheel 32 reaches near the rotation end position in the valve opening direction R1 and rotates toward the rotation end position, the arc-shaped notch (the other connecting portion) 36 The first sector worm wheel 31 is slightly rotated in the valve opening direction R <b> 1 by interfering with the (one linking portion) 35, and is initially engaged with the first worm 33. Immediately after the start of the initial engagement, as shown in FIG. 4, the non-engagement portion 32A at the rear end of the second sector worm wheel 32 in the valve opening direction R1 corresponds to the second worm 34, and the second sector worm wheel 32 stops at the rotation end position in the valve opening direction R1, and the sub-valve element 3 opens (fully opens). After the first worm wheel 31 is initially engaged with the first worm 33, the rotation of the first worm 33 causes the first sector worm wheel 31 to rotate in the valve opening direction R1, as shown in FIG. When the first sector worm wheel 31 interferes with the first stopper 37 provided on the second sector worm wheel 32, the first sector worm wheel 31 stops at the rotation end position in the valve opening direction R1, and the main valve body 2 Open the valve (fully open). Next, a procedure for fully closing the main valve body 2 and the sub-valve body 3 from the valve-closed state of the butterfly valve with a built-in sub-valve in which the main valve body 2 and the sub-valve body 3 are fully open will be described. The rotation of one operation shaft 40 is controlled by the rotation of the intermediate gear 39.
A, is transmitted to both the first worm 33 and the second worm 34 via the input transmission mechanism 39 composed of the first gear 39B and the second gear 39C, and rotates them simultaneously. If these rotation directions are directions for rotating the first sector worm wheel 31 and the second sector worm wheel 32 at the start position shown in FIG. 5 in the valve closing direction (second rotation direction) R2, the first worm 33 1st rotation
The sector worm wheel 31 rotates in the valve closing direction R2. In this case, the non-meshed portion 32A is attached to the front end in the valve closing direction R2.
Is not engaged with the second worm 34, the rotation of the second worm 34 is not transmitted to the second sector worm wheel 32, and the second sector worm wheel 32 is stopped. While the first sector worm wheel 31 rotates from the start position to the vicinity of the rotation end position, a pin (one connecting portion) 35 provided on the first sector worm wheel 31 is provided on the second sector worm wheel 31. Since it does not interfere with the pin (one connecting portion) 35, the rotation of only the first sector worm wheel 31 in the valve closing direction R2 is continued. While the first sector worm wheel 31 has reached the vicinity of the rotation end position in the valve closing direction R2 and rotates therefrom toward the rotation end position, the pin (one connecting portion) 3
5 interferes with the arc-shaped notch (the other connecting portion) 36, rotates the second sector worm wheel 32 slightly in the valve closing direction R <b> 2, and initially meshes with the second worm 34. Immediately after the start of the initial engagement, as shown in FIG. 6, the non-engaging portion 31A provided on the first sector worm wheel 31 corresponds to the first worm 33, and the first sector worm wheel 31 rotates in the valve closing direction R2. It stops at the end position, and the main valve body 3 is closed (fully closed). After the second sector worm wheel 32 is initially engaged with the second worm 34, the rotation of the second worm 34 causes the second sector worm wheel 32 to rotate in the valve closing direction R2, as shown in FIG. When the second sector worm wheel 32 interferes with the second stopper 38 provided on the first sector worm wheel 31, the second sector worm wheel 32 stops at the rotation end position in the valve closing direction R2, and the auxiliary valve body 3 Close the valve (fully close). As described above, by merely specifying the rotational direction of one operating shaft 40 without considering the opening / closing operation order of the main valve body 2 and the sub-valve body 3, the main valve body 2 and the sub-valve body 3 are automatically determined based on the opening / closing operation order. By rotating the two axes of the upper valve stem 9 of the sub-valve element 3 via the upper valve stem 4 and the shaft 14 of the valve element 2, the main valve element 2 and the sub-valve element 3 can be opened and closed in a specified order. Therefore, the main valve body 2 and the sub-valve body 3 are arranged like a conventional two-shaft rotating device having two operation shafts.
Each time the valve is opened and closed, the complicated operation of rotating the two operation axes in the specified direction in the valve opening or valve closing direction is not required, and the operation can be easily performed. No errors occur. In the above embodiment, the first sector worm wheel 31 and the first worm 33 are combined, and the second sector worm wheel 32 and the second worm 34 are combined. The present invention is not limited to only the above-described embodiment, and combines a first sector bevel gear instead of the first sector worm wheel 31 with a first bevel pinion instead of the first worm 33, and the second sector worm wheel 32 An alternative second sector bevel gear and an alternative second bevel pinion for the second worm 34 may be combined. However, in this case, it is necessary to take care to prevent the rotation of the first bevel pinion and the second bevel pinion due to the load from the first sector bevel gear and the second sector bevel gear. An intermediate gear 39A fixed to the tip of one operating shaft 40, a first gear 39B fixed to one end of the first worm 33 and meshing with the intermediate gear 39A, and one end of the second worm 34 The fixed intermediate gear 39A
Transmission mechanism 39 having a second gear 39C meshing with
And the spiral of the first worm 33 and the second worm 34 are set to be opposite to each other, but the first gear 39B and the second worm 34 fixed to one end of the first worm 33 are described. Second gear 39C fixed to one end of the
An input transmission mechanism 39 having two intermediate gears interposed therebetween may be employed. When such an input transmission mechanism 39 is employed, the spirals of the first worm 33 and the second worm 34 can be set in the same direction. Further, in the above-mentioned embodiment, the two-axis rotating device with one operation shaft according to the present invention is applied to the opening / closing device of the butterfly valve with a built-in sub-valve. The present invention is not limited to the opening and closing device for the butterfly valve, but can be applied to a device for rotating two members rotating around an axis in a specified order in the forward and reverse directions. On the other hand, the other connecting portion 36 formed by an arc-shaped notch is provided in the second sector worm wheel 32. 36 may be provided, and one connecting portion 35 formed of a pin protruding from the first sector worm wheel 31 may be fitted into the one connecting portion 36 from below. As described above, according to the present invention, an automatic operation can be performed simply by specifying the rotation direction of one operation axis without considering the opening / closing operation order of the two axes of the main axis and the sub-axis. Since the two axes can be rotated based on the optimal opening / closing operation sequence, like the conventional two-axis rotating device having two operation axes, each time the two axes are rotated, the two operation axes are moved. This eliminates the need for a complicated operation of rotating in the specified direction in the forward or reverse direction, allows easy operation, and improves the reliability because no error occurs in the operation order.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded plan view showing an embodiment of the present invention. FIG. 2 is a plan view of an assembled state. FIG. 3 is a view as viewed in the direction of arrows AA in FIG. 2; FIG. 4 is an exploded plan view showing a form during rotation in a first rotation direction. FIG. 5 is a plan view of an assembled state showing a form at the end of rotation in a first rotation direction. FIG. 6 is an exploded plan view showing a form during rotation in a second rotation direction. FIG. 7 is a front view of a conventional example applied to a butterfly valve with a built-in auxiliary valve. FIG. 8 is a plan view of FIG. 7; FIG. 9 is a side view of FIG. 7; FIG. 10 is an enlarged sectional view taken along the line BB of FIG. 8; FIG. 11 is an enlarged sectional view taken along line DD of FIG. 8; [Description of Signs] 4 Upper valve stem (main shaft) 14 Shaft (sub shaft) 17 Two-axis rotating device 31 First sector worm wheel (Main shaft side first gear) 31A Non-meshing portion 32 Second sector worm wheel (Sub shaft side) 32A Non-meshed portion 33 First worm (second shaft on main shaft side) 34 Second worm (second gear on second shaft) 35 Pin (one side connecting portion) 36 Arc-shaped notch (the other side connecting) 37) 1st stopper 38 2nd stopper 39 Input transmission mechanism 40 Operating axis C2 Valve axis R1 Valve opening direction (first rotation direction) R2 Valve closing direction (second rotation direction)

Claims (1)

(57) [Claim 1] A main shaft and a sub shaft inserted through the main shaft along the axis of the main shaft are rotated around one axis of the main shaft by rotation of one operation shaft. A two-axis rotating device that rotates in the order specified in each of the forward and reverse directions, and is provided so as to be able to rotate simultaneously with the main shaft, and has a non-meshing portion at a front end in a first rotation direction. A first gear, and a countershaft-side first gear provided opposite to the main shaft-side first gear so as to be simultaneously rotatable with the countershaft and provided with a non-meshing portion at a rear end of the first rotation direction. A gear, a main shaft side second gear meshable with the main shaft side first gear, a sub shaft side second gear meshable with the sub shaft side first gear, and one connecting portion provided on the main shaft side first gear. Provided on the countershaft-side first gear, wherein the countershaft-side first gear is rotated forward by the rotation of the countershaft-side second gear. While rotating from the start position in the first rotation direction to the vicinity of the rotation end position, the one connection portion does not interfere with the one connecting portion, and rotates from the vicinity of the rotation end position in the first rotation direction to the rotation end position. To cause the first main gear on the main shaft side to mesh with the second gear on the main shaft side at the same time, and to rotate the first main gear on the main shaft side by reverse rotation of the second main gear on the main shaft side.
While the gear rotates from the start position in the second rotation direction to the vicinity of the rotation end position, the gear does not interfere with the one connecting portion,
The other connecting portion that interferes with the one connecting portion during the rotation from the vicinity of the rotation end position in the rotation direction to the rotation end position to initially mesh the countershaft-side first gear with the countershaft-side second gear; At the rotation end position of the sub-shaft-side first gear in the first rotation direction, which interferes with the main-shaft-side first gear;
A first stopper for stopping the first spindle-side gear at a rotation end position in the first rotation direction; and a sub-stopper provided on the first spindle-side gear at a rotation end position of the first spindle gear in the second rotation direction. Interfering with the shaft-side first gear,
A second stopper for stopping the first countershaft-side gear at a rotation end position in the second rotation direction; and a second main-shaft-side gear and a second countershaft-side gear via an input transmission mechanism.
A two-axis rotating device using one operation shaft, comprising: one operation shaft for simultaneously rotating both of the gears.