JP4907509B2 - Rotation drive device by cylinder drive - Google Patents

Description

  The present invention relates to a rotary drive device by cylinder drive for opening and closing dampers, valves and the like.

  2. Description of the Related Art Conventionally, pneumatic and electric actuators are widely used as torque actuators for valves and dampers that are opened and closed by a rotating operation. However, these actuators are limited in applicable torque, and when a high torque is required, a lever drive type using an oil or pneumatic cylinder as a drive source is generally used as a simple structure.

  On the other hand, air operated on / off valves installed in gas supply / exhaust lines of gas combustion boilers at steelworks, power plants, etc., are generally opened and closed by rotating the valve body by the reciprocating motion of the piston of the air cylinder. Has been done. For example, as disclosed in Japanese Patent Laid-Open No. 11-336936 (Patent Document 1), a valve body is rotatably provided in a valve box by a lateral valve shaft, and a piston rod is valved by an air cylinder. The valve is connected to a shaft ring, and is configured to open and close by rotating and retracting the piston rod.

  Moreover, it shows in FIG. 4 as a general structural example of the lever drive type mentioned above. FIG. 4 is a diagram showing a conventional lever-driven rotary drive device. As shown in FIG. 4, the rotating shaft 1 provided in the casing 2 supports the rotating shaft 1 with a bearing box 4 provided in the casing through-portion, and connects the driving arm 5 and the rotating shaft 1 to the shaft end. The drive arm 5 connected by the cylinder 3 by the cylinder tip hardware 10 and the pin 6 is driven by the cylinder 3.

On the other hand, a cylinder reaction force receiving bracket 9 is provided from the casing 2 to support the cylinder 3 and receive a reaction force. The reaction force transmitted to the bracket 9 is transmitted through the cylinder support metal 8, for example. In this case, the reaction force receiving bracket 9 of the Linder that receives the reaction force from the casing 2 is structured to be supported in a cantilever state at a position away from the casing 2. Furthermore, the casing 2 also needs to have a strength that can withstand the load from the reaction force receiving bracket 9. In addition, the code | symbol 7 shows a shaft end plate and 11 is a cylinder support metal fitting (cylinder end support type).
Japanese Patent Laid-Open No. 11-336936

  The above-described Linder reaction force receiving bracket 9 that receives the reaction force from the casing 2 as described above with reference to FIG. I do not get. Furthermore, as described above, the casing 2 also needs to have a strength that can withstand the load from the reaction force receiving bracket. In addition, the cylinder support 8 is not connected to the casing 2 and may be fixed by another support. However, since the force from the cylinder 3 acts as an external force on the support and the casing 2, The structure must be able to withstand external forces. As described above, the arm drive system using oil and pneumatic cylinders is simple as a mechanism, but a structure for supporting the cylinder reaction force is required to obtain the rotational torque that is originally required. There is a problem of growing.

In order to solve the above-mentioned problems, the inventors have made extensive developments. As a result, in the arm drive type rotary drive device using oil and pneumatic cylinders, the structure from the casing is supported as a structure for supporting the cylinder reaction force. A cylinder support plate connected to the bearing that supports the rotating shaft is provided instead of the bracket support, and the operating point on the cylinder arm and the cylinder reaction force receiving part are flush with the center plane of the cylinder reaction force receiving plate. It is in the point configured in

In other words, since the drive arm is located outside the bearing housing with respect to the cylinder support plate connected to the bearing housing, the cylinder operating point is counteracted by adopting a structure that transmits the cylinder thrust through the cantilever pin protruding from the drive arm. By configuring the force receiving plate on the same plane as the thickness center plane of the force receiving plate, the cylinder support plate is not subjected to a force accompanied by out-of-plane deformation, and can be processed by in-plane deformation having high rigidity and strength. Furthermore, since the cylinder reaction force is processed by the internal force with the bearing housing, the arm drive system is a torque actuator with an extremely simple structure, in which the deformation load accompanying the cylinder reaction force does not act on the casing and only the torque is transmitted. The present invention provides a rotary drive device using a cylinder drive.

The gist of the invention is that
(1) In a drive of a damper or the like having a rotating shaft inside the casing and opening and closing by rotating the shaft provided with a driving mechanism for the rotating shaft outside the casing, a cylinder support plate connected to a bearing portion supporting the rotating shaft is provided, In addition, the operating point to the cylinder drive arm and the cylinder reaction force receiving portion are configured on the same plane as the center surface of the cylinder supporting plate connected to the bearing portion , and the cylinder supporting point is the cylinder supporting plate. A rotary drive device by cylinder drive, characterized in that the cylinder reaction force is transmitted by being arranged on the center surface of the end plate thickness of the cylinder.
(2) The bearing portion that supports the rotating shaft according to (1) is fixed to the casing, is formed integrally with the cylinder support plate, and the rotating shaft extends to the drive arm that extends through the bearing portion. It is in the rotation drive device by the cylinder drive characterized by being connected.

As described above, the cylinder thrust plate and the cylinder reaction force receiving portion according to the present invention are configured on the same plane as the center plane of the thickness of the cylinder support plate connected from the bearing, so that the cylinder support plate is out of plane. A force accompanying deformation does not act, and can be processed by in-plane deformation with high rigidity and strength. Furthermore, since the cylinder reaction force is processed by the internal force with the bearing housing, the deformation load associated with the cylinder reaction force does not act on the casing, and only torque is transmitted, resulting in a torque actuator with an extremely simple structure. It has an excellent effect.

Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic diagram of a rotary drive device by cylinder drive according to the present invention. As shown in this figure, the rotating shaft 1 is supported by a bearing box 4 provided in a penetrating portion of the casing 2, and a drive arm 5 is coupled to the rotating shaft 1 at a shaft end extending from the bearing box 4. . The cylinder 3 for driving the drive arm 5 is connected to the rear end portion thereof by a cylinder support metal (cylinder end support type) 11 by a cylinder support plate 12 connected to the bearing box 4. Although the cylinder reaction force is transmitted in this portion, the force is transmitted on the center surface of the thickness of the cylinder support plate 12.

  On the other hand, a pin 6 installed in a cantilevered state from the drive arm 5 is provided on the arm tip side from the drive arm 5 and is rotatably connected to a cylinder tip metal fitting (clevis type) 10. The point of action of the force on the pin 6 of the cylinder tip hardware (clevis type) 10 is configured to be on the same plane as the center plane of the thickness of the cylinder support plate 12.

  FIG. 2 is a schematic diagram illustrating an example in which the cylinder support system is a trunnion system. A cylinder support metal (trunion support type) 13 is provided instead of the cylinder support metal (cylinder end support type) 11 in FIG. 1, and the cylinder support plate 12 is provided by this cylinder support metal (trunion support type) 13 as in FIG. The mechanism has the same function as FIG.

  FIG. 3 is a diagram showing a cross section taken along line AA in FIG. As shown in FIG. 3, the rotating shaft 1 is supported by a bearing box 4, and a bearing 14 is installed in the bearing box 4. In this case, although a slide bearing is shown, a roller bearing or the like may be used. It is also possible to provide a sealing mechanism such as a ground seal in this part.

  A drive arm 5 connected to the rotary shaft 1 is installed outside the bearing housing 4, and a key 15 is provided for torque transmission. A shaft end plate 7 is provided to fix the rotating shaft 1 and the drive arm 5 in the axial direction. A pin 6 is provided at the tip of the drive arm 5, and a cylinder tip metal fitting (clevis type) 10 is rotatably connected to the drive arm 5 and fixed in the axial direction by a pinning end plate 16. In this figure, the cylinder end hardware (clevis type) 10 is positioned on the center surface 17 of the thickness of the cylinder support plate 12.

  As described above, since the cylinder tip hardware (clevis type) 10 is positioned on the thickness center surface 17 of the cylinder support plate 12, the cylinder reaction force is transmitted to the bearing housing 4 and is offset with the cylinder reaction force. Only the torque is transmitted to the shaft, and only the torque as the reaction force is transmitted from the bearing housing 4 to the casing 2. The torque as the reaction force on the casing 2 is an in-plane load of the casing having high rigidity and strength, and does not particularly require reinforcement. In addition, the cylinder support plate 12 generates in-plane loads and in-plane bending loads due to the cylinder reaction force. However, if necessary, the portions where compressive stress is generated may be reinforced by buckling with ribs or the like.

  Since the pin 6 is in a cantilever state, the drive arm 5 receives both moments of bending and torsion, and therefore needs to have a corresponding cross-sectional strength. It is transmitted as a bending moment with respect to the shaft at the shaft end of the shaft 1 and is canceled at the position of the bearing 14. Therefore, the shaft diameter is not increased as compared with the conventional method, and it is possible to provide an extremely excellent facility such that the facility is light in weight.

It is the schematic of the rotational drive apparatus by the cylinder drive based on this invention. It is the schematic which shows the example in case a cylinder support system is a trunnion type. It is a figure which shows the AA cross section in FIG. It is a figure which shows the conventional lever drive type rotational drive apparatus.

Explanation of symbols

1 Rotating shaft 2 Casing 3 Cylinder 4 Bearing box 5 Drive arm 6 Pin 7 Shaft end plate 8 Cylinder support hardware 9 Reaction force receiving bracket 10 Cylinder tip hardware 11 Cylinder support hardware (Cylinder end support type)
12 Cylinder support plate 13 Cylinder support hardware (Trunnion support)
14 Bearing 15 Key 16 End plate for pinning 17 Plate thickness center plane


Patent applicant Nippon Steel Engineering Co., Ltd. 1
Attorney Attorney Shiina and others 1

Claims (2)

A cylinder support plate connected to a bearing portion that supports the rotary shaft is provided in the drive of a damper or the like that has a rotary shaft inside the casing and is provided with a drive mechanism for the rotary shaft outside the casing. The operating point on the drive arm and the cylinder reaction force receiving portion are configured on the same plane as the plate thickness center plane of the cylinder support plate connected to the bearing portion , and the cylinder support point is the end of the cylinder support plate . A rotary drive device by cylinder drive, which is arranged on the center surface of the plate thickness and transmits a cylinder reaction force . The bearing portion for supporting the rotating shaft according to claim 1 is fixed to the casing and formed integrally with the cylinder support plate, and the rotating shaft is connected to a drive arm of a portion extending through the bearing portion. A rotary drive device using a cylinder drive.

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