JPH0461203B2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a rotary actuator that converts the reciprocating motion of a piston caused by fluid pressure into a rotational motion of a shaft and outputs the result, such as for automatic opening/closing of various valves, and for operating a 90° rotation mechanism. The present invention relates to an actuator that can be used as a swing actuator for use in other applications.

Prior Art Rotary actuators of the type described above are known.

A conventional rotary actuator has a cylinder part that has fluid intake and discharge ports at both ends and houses a reciprocating piston, and an output shaft part that is connected to the piston and rotates, which are formed as a single unit. The rotary actuator is operated by connecting an operating solenoid valve, a pressure reducing valve, etc. to the intake and outlet ports of the cylinder portion of the motor via piping.

Problems With conventional rotary actuators, when assembling them into various devices such as positioners that control the rotational position of the output shaft and switches that are activated by the rotation of the rotary actuator, such as limit switches, it is difficult to support the rotary actuator. It was necessary to provide supporting members for each device separately from the members. For this reason, it is necessary to secure space for supporting members for each device separately from the space for supporting members for the rotary actuator, which requires extra space and requires more effort to install. It was hot. In addition, extra members are required for supporting the equipment, which increases costs.
There was a problem.

Solution Means and Effects The present invention solves the above-mentioned conventional problems by using a piston,
a cylinder part that reciprocally accommodates the piston; an output shaft that is rotatably supported by the cylinder part and extends in a direction perpendicular to the axis of the cylinder part; the piston and the output shaft are connected; In a rotary actuator having a connecting member that converts reciprocating linear motion of a piston into reciprocating rotational motion of an output shaft, a rotary actuator is formed protruding externally on a support portion of the cylinder portion for supporting a free end side of the output shaft. A bracket is removably fixed to the pedestal with bolts, and the bracket has a base fixed to the pedestal and a seat integrally formed with the base. A shaft hole is formed through the seat into which the output shaft can be inserted, and the seat has a screw hole for mounting a device to be attached and a port for supplying fluid formed at a position communicating with the device. The problem has been solved by a rotary actuator characterized in that the port is connected to a connection port provided on the side of the base and a flow path within the base.

According to the present invention, the base of the bracket is fixed to the base of the cylinder part of the rotary actuator, and the equipment to be attached, that is, the casing of the equipment, can be fixed to the seat of the bracket. At this time, since the output shaft of the rotary actuator passes through the bracket, the rotating shaft of the device can be connected to the output shaft by fitting.
If necessary, the output shaft and the rotating shaft can be connected using a simple coupling. By simply fixing various types of equipment to the bracket, the flow paths are automatically communicated with the connection ports of the bracket, making it possible to easily connect various types of equipment and rotary actuators in terms of flow paths.

Therefore, the equipment can be assembled to the rotary actuator in advance at a factory or the like, which simplifies the work. When assembling on site, by preparing a support member for the rotary actuator and fixing only the rotary actuator to the support member, it is possible to automatically arrange other devices at predetermined positions. In other words, it becomes possible to handle various devices and the rotary actuator as an integrated product. The rotation of the output shaft of the rotary actuator is rotationally transmitted to the shaft of the equipment, and the rotation of the equipment extracts electrical signals and fluid signals to control the rotary actuator itself or other equipment.

Embodiment In FIGS. 1 to 5, a rotary actuator 1 includes a cylinder portion having a piston 2 and a cylinder case 3 that accommodates the piston 2 so as to be able to slide back and forth, and is formed integrally with the cylinder case 3. It has an output shaft part 9 including an output shaft 8 rotatably supported by a first support part 4 and a second support part 5 which are arranged opposite to each other via metals 6 and 7.

The piston 2 has two piston parts 2a and 2b.
and a bridge portion 2c that connects both piston portions. The bridge portion 2c is formed so as to avoid the position of the output shaft 8.

A fork-shaped arm 10 is attached to the output shaft 8 so as not to be relatively rotatable, and the fork end portion of the arm 10 engages with a pin 11 attached to the bridge portion 2c. Arm 10 is attached to pin 11 as necessary.
A ring 12 is fitted to ensure smooth sliding movement. The pin 11 and the arm 10 constitute a connecting portion that converts the reciprocating linear motion of the piston 2 into reciprocating rotational motion of the output shaft 8.

The output shaft 8 is prevented from falling off from the supports 4 and 5 by stop rings 13 and 14.

Both ends of the cylinder case 3 are provided with flanges 15,
An adjusting screw 17 is screwed into the flanges 15 and 16 to abut against the piston portion 2a or 2b to determine the limit position of movement of the piston, and the position can be fixed with a nut 18.

The main body is constituted by the cylinder case 3, the first support part 4, the second support part 5, and flanges 15 and 16. A pedestal part 5a that protrudes from the cylinder case 3 is formed in the second support part 5, and the interior surrounded by the rectangular outline of the pedestal part 5a is formed as a recessed part 5b. Scales 20 indicating the rotation angle of the output shaft 8 by a pointer 19 attached to the output shaft 8 are integrally formed in the recess 5b as protrusions at predetermined angular intervals. It is convenient that the height of the scale 20 is equal to or less than the height of the outline of the pedestal 5a.

The square hole of the pointer is inserted into the connecting end 8a of the output shaft 8 which has a square cross section, and is fixed by a stop ring 21. Generally, by rotating the output shaft 8 by 90 degrees, a valve connected to the output shaft 8 is opened and closed, a switch is opened and closed, and so on. The pointer 19 can be used to point to the scale on the right side or the scale on the left side of the plane orthogonal to the cylinder axis. For example, if the output shaft 8 is switched from the closed position to the open position by clockwise rotation while pointing to the scale on the right side, the output shaft 8 is switched from open to closed by counterclockwise rotation. In this state, if you change the position of the pointer 19 so that it points to the scale on the left, the output shaft can be used as a scale so that it changes from open to closed when rotated clockwise and from closed to open when rotated counterclockwise. can. For this purpose, it is recommended to write open/close symbols at opposite positions in a plane perpendicular to the cylinder axis. In FIG. 1, "open" is indicated by the symbol "O" and "closed" by the symbol "S". There is an advantage that the pointer 19 can be easily adapted by simply changing the attachment state of the pointer 19 according to the opening/closing direction of the member attached to the output shaft 8.

A mounting seat 22 is formed on the side of the cylinder case 3, and a solenoid valve or the like is mounted on the mounting seat 22.

Openings 23, 23 are formed in the mounting seat 22,
The openings 23, 23 are connected to flow passages 24, 2 formed in the cylinder case 3, respectively, as shown in FIG.
5 communicates with the left and right chambers of the piston portions 2a and 2b, respectively, through spaces on the flanges 15 and 16 sides.

1 to 5 show flow paths 24 and 2 by switching operation of a solenoid valve attached directly or indirectly to the mounting seat 22.
A double-acting rotary actuator is shown in which the rotary actuator operates by alternately switching the flange 5 to the suction side and the discharge side, but as a modification, as shown in FIGS. 6 and 7, one flange, e.g. By fixing the spring cartridge cartridge 26 to the cylinder case 3, a single acting rotary actuator 1' can be formed.

Spring cartridge 26 is cartridge case 2
7, a sleeve-shaped spring receiver 28 supported in the cartridge case 27, a spring guide 29 slidably attached to the spring receiver, and a spring receiver disc 30 fixed to the spring guide 29. It has a spring 31 stretched between the spring receiver 28 and the spring receiver disc 30, and when the spring receiver disc 30 is fixed to the cylinder case 3, the spring receiver disc 30 is pressed against the piston 2 (2a in the figure). .

When fluid is supplied by the action of the electromagnetic valve attached to the mounting seat 22, the piston 2 is pushed to the left in the figure against the force of the spring 31. The amount of movement of the piston is adjusted by the screwing amount of an adjusting screw 32 screwed into the cartridge case 27.

When the fluid is discharged by switching the solenoid valve, the piston 2 returns to its initial position by the force of the spring 31.

Although no particular explanation has been given for each of the rotary actuators described above, necessary portions are provided with known sealing members to prevent fluid leakage.

The output shafts 8 of the rotary actuators 1 and 1' are equipped with devices that control the rotational position of the rotary actuators, such as positioners, and switches, such as rotary switches, that transmit electrical signals by the rotation of the output shafts of the rotary actuators. Equipment to be extracted may be attached. Such a device can have its casing directly fastened to a screw hole in the base 5a. In this case, the shaft of the device is connected to the output shaft 8 through a coupling or by forming a square hole at the end of the shaft of the device and inserting the square hole into the end of the output shaft having a square cross section. This allows the device to be assembled as an integral structure with the rotary actuator.

The device can be assembled to the rotary actuator using a bracket instead of being directly attached to the pedestal 5a.

The bracket 50 includes, for example, a base 51 that comes into contact with the pedestal 5a and the base 5 as shown in FIGS. 8 to 10.
1 and a seat portion 52 integrally formed with the seat portion 52. base 5
1 is formed with a hole 53 into which a screw is inserted for fastening to a screw hole in the base 5a of the rotary actuator 1, 1'. A shaft hole 54 is formed passing through the base portion 51 and the seat portion 52. The shaft hole 54 is formed as a space in which the output shaft 8 of the rotary actuator, the shaft of the equipment to be attached, and a coupling used if necessary can be inserted and rotated.

The seat portion 52 has a screw hole 55 for fixing the casing of a device, such as a positioner or a switch, and a port 56 at a position communicating with the flow path of the device for supplying fluid to the device. A channel 58 having a connection port 57 connected to a fluid source etc. via a conduit on the side of the base 51 and/or the seat 52 is connected to the port 5.
6. In the figure, seat 5
2 is formed into a substantially cross shape with the flesh removed except for the screw hole 55, the port 56, and the minimum portion necessary for mounting the device, but the shape is not limited to this.

An example of an integral structure in which a positioner is attached to a rotary actuator using a bracket 50 is shown in FIGS. 11 and 12. In the figure, a bracket 50 is fixed to the rotary actuator 1, and a positioner 60 is assembled to the bracket 50. The cylinder portion of the rotary actuator and the positioner 60 are connected through a conduit 61 in a fluid path.

The output shaft of the positioner 60 can be further connected to another device.

Effects According to the present invention, by fixing the bracket to the rotary actuator, various devices and the rotary actuator can be shipped pre-assembled as an integral part at the factory, and even at the site, the rotary actuator can be attached to a predetermined support member. Various devices can now be automatically assembled by simply fixing the actuator.
Therefore, the assembly work at the site becomes easy, and since no supporting members other than the supporting member for the rotary actuator are required at the mounting location, a small number of paces is sufficient.

According to the present invention, various devices and rotary actuators can be configured compactly, making it possible to save space and reduce costs.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a rotary actuator according to the present invention, Fig. 2 is a plan cross-sectional view, Fig. 3 is a front vertical sectional view, Fig. 4 is a partially cutaway perspective view, and Fig. 5 is a partially cutaway perspective view. FIG. 6 is a partially cutaway plan view showing a single-acting rotary actuator according to another embodiment; FIG.
FIG. 7 is a front longitudinal sectional view of the rotary actuator shown in FIG. 6, FIG. 8 is a plan view of a bracket that can be attached to the rotary actuator for mounting equipment such as positioners, switches, etc., and FIG. Fig. 8 is a front sectional view, Fig. 10 is a left side view of Fig. 8, Fig. 11 is a front view of a rotary actuator with a positioner mounted as a device by a bracket, and Fig. 12 is a plan view of Fig. 11. , FIG. 13 is a side view. 1, 1'...Rotary actuator, 2...Piston, 3...Cylinder case, 5...Support part, 5a
... Pedestal part, 5b... Recessed part, 8... Output shaft, 10... Arm (connecting part), 11... Pin (connecting part), 20... Scale, 50... Bracket, 51... Base, 52... Seat part, 53... Hole, 54...Shaft hole, 55...Screw hole, 56
...Port, 57...Connection port, 58...Flow path.

Claims (1)

[Claims] 1. A piston, a cylinder part that accommodates the piston in a reciprocating manner, an output shaft rotatably supported by the cylinder part and extending in a direction perpendicular to the axis of the cylinder part, and the piston and the output shaft and a connecting member that converts the reciprocating linear motion of the piston into reciprocating rotational motion of the output shaft, the rotary actuator has an external support portion of the cylinder portion for supporting the free end side of the output shaft. A pedestal portion is provided that protrudes from the pedestal, and a bracket is removably fixed to the pedestal portion with a bolt, and the bracket has a base portion fixed to the pedestal portion and a seat portion integrally formed with the base portion. A shaft hole is formed through the base and the seat into which the output shaft can be inserted, and the seat has a screw hole for mounting a device to be attached and a fluid hole formed at a position communicating with the device. A rotary actuator characterized in that the rotary actuator is provided with a supply port, and the port is connected to a connection port provided on a side of the base portion by a flow path within the base portion.