JPH0461966B2 - - 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/exhaust port of the cylinder section through piping.

Problems In conventional rotary actuators, an indicator scale plate indicating the rotation angle of the output shaft is formed as a separate part and attached to the cylinder case when each part is assembled. When the scale plate is installed, it is inevitable that a positional error will occur, making it impossible to indicate an accurate position. There was a problem. Also, the "open" of the scale plate,
Since the "Closed" display is fixed, different types of scale plates are required when rotating the output shaft in the same direction to switch from "Open" to "Closed" and from "Closed" to "Open". There was a problem in that a large number of scale plates had to be prepared.

Solution Means and Effects The present invention solves the above-mentioned conventional problems by using a piston,
a cylinder portion that reciprocally accommodates the piston; an output shaft that is rotatably supported by the cylinder portion and extends in a direction perpendicular to the axis of the cylinder portion; and a piston that connects the piston and the output shaft. and a connecting member for converting reciprocating linear motion of the output shaft into reciprocating rotational motion of the output shaft, the rotary actuator includes a connecting member that protrudes outward from a support portion of the cylinder portion for supporting the free end side of the output shaft. A pedestal part is provided, the pedestal part has a rectangular outline part and a recessed part surrounded by the outline part, and the recessed part is arranged symmetrically about a plane passing through the center of the output shaft and orthogonal to the axis of the cylinder part. The problem was solved by a rotary actuator characterized in that two sets of scales are integrally formed as protrusions at predetermined angular intervals, and a pointer is attached to the output shaft so that the position can be changed.

According to the present invention, the indicator scale plate indicating the rotation angle of the output shaft is formed as a pedestal having a rectangular contour and a recess surrounded by the contour. Scales are integrally formed in the recessed portion of the pedestal portion as protrusions at predetermined angular intervals symmetrically about a plane passing through the center of the output shaft and perpendicular to the axis of the cylinder portion. Therefore, the installation error of the scale plate has been eliminated. In addition, the scale is formed as a protrusion that is arranged symmetrically at predetermined angular intervals around a plane that passes through the center of the output shaft and is orthogonal to the axis of the cylinder. When switching from "open" to "closed" and "closed" in the same direction of rotation.
It is possible to easily and appropriately change the switch from "open" to "open".

Embodiment In FIGS. 1 to 4, 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-like 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. A ring 12 is fitted into the pin 11 to facilitate sliding on the arm 10. The pin 11 and the arm 10 constitute a connecting portion.

The output shaft 8 is prevented from falling off from the supports 4 and 5 by strip 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. On the second support portion 5 into which the metal 7 is press-fitted, scales 20 indicating the rotation angle of the output shaft 8 by a pointer 19 attached to the output shaft 8 are integrally molded at predetermined angular intervals. The second support part 5 is formed as a base part on the mounting seat 22 of the cylinder case 3, and has a recess around the part where the metal 7 is press-fitted in order to reduce excess material and to reduce the occurrence of blowholes during casting. Since it is formed as a metal press-fit part, a protruding rib part is provided to reinforce the metal press-fit part. The rib portion also serves as a scale.

The square hole of the pointer 19 is inserted into the connecting end 8a of the output shaft 8 having a square cross section, and the pointer 19 is fixed by a stopper 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 switches from open to closed when rotated clockwise and from closed to open when rotated counterclockwise. can.
For this purpose, it is preferable 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, 25 formed in the cylinder case 3, respectively, as shown in FIG.
This communicates with the left and right chambers of the piston portions 2a and 2b through the spaces on the flanges 15 and 16, respectively.

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 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.

By directly attaching the solenoid valve to the mounting seat 22 of the rotary actuator 1, 1' described above, the rotary actuator 1'' with an integrated pipingless operation valve can be installed in the 8th position.
An example is obtained as shown in FIGS.

An embodiment of a solenoid valve used in the rotary actuator 1'' with integrated operation valve shown in FIGS. 8 to 10 will be described with reference to FIGS. 11 and 12.

The solenoid valve 40 has a main valve 41 and a pilot valve 42. The main valve 41 has a valve body 43 that directly abuts the mounting seat 22 of the rotary actuator and can be fixed with a bolt. The openings 23, 23 of the mounting seat 22 are located on the surface of the valve body 43 that contacts the mounting seat 22.
A first output port 44 and a second output port 44 are located in communication with each other.
Output port 45 is open.

A spool 90 is installed in the spool hole 46 of the valve body 43.
is attached so that it can slide back and forth. The through hole 46 has a third annular groove 48 that communicates with the air supply port 47, and a first annular groove 48 that communicates with the air supply port 47.
A first annular groove 50 communicating with the exhaust port 49, a fifth annular groove 52 communicating with the second exhaust port 51, a second annular groove 53 communicating with the first output port 44, and a second annular groove 53 communicating with the second output port 45. Communicating fourth annular grooves 54 are formed at appropriate positions. Valve body 4
3, a pilot operating flow path 56 is formed in the left end lid part in the figure so that fluid pressure can be applied to one end of the spool 90 (left end in the figure).

A cylindrical hole 58 into which a spool piston 57 is slidably inserted is formed at the end of the spool 90 on the side opposite to the pilot operating flow path 56 side, and the cylindrical hole 58 has a third annular groove 48 in between. The spool 9 is opened to the circumferential surface of the spool 90 between the two lands 59 and 60 of the spool 90 located at the
It communicates with a flow path 61 formed inside 0. The spool piston 57 abuts against a lid 62 that seals the end of the valve body 43.

A bypass passage 63 connects the first output port 44 and the second output port 45, a bypass valve 64 is provided in the middle of the bypass passage 63 to open and close the bypass passage 63, and the bypass valve 64 is connected to the valve body. 4
3 protruding knob portions 65, the knob portions 6
By turning 5, the valve body 66 opens into the bypass path 63.
The valve seat is configured to be seated on or removed from a valve seat provided in the valve seat. The knob 65 may also be structured to protrude not upwardly in the figure but in other directions toward the front.

A pilot air supply passage 67 that passes through the valve body 43 and opens at the end of the lid portion 55 communicates with the air supply port 47 .

A casing 68 of the pilot valve 42 is fixed to the lid 55 of the main valve 41 with screws or the like.

The pilot valve 42 has a valve part 69 and a solenoid part 7.
0. The solenoid section 70 has a fixed iron core 71 and a movable iron core 72 arranged coaxially with the fixed iron core 71 and movable in the axial direction in a manner known per se.
, an excitation coil 73 fixedly arranged so as to surround a fixed iron core 71 and a movable iron core 72 , and a yoke 74 , which are housed in a solenoid casing 75 .

The valve part 69 includes a casing 68 having an air supply passage 76, a pilot flow passage 77, and an exhaust passage 78, and a first valve formed within the casing 68 and provided at the connection between the air supply passage 76 and the pilot flow passage 77. The valve body 79 is seated on a seat 80. Valve body 79 is exhaust passage 78
It is formed so that it can also sit on a second valve seat 81 provided at the connection between the valve and the pilot flow path 77. Valve body 79
A leg 82 fixed to acts as a valve stem, and is in contact with the movable core 72 of the solenoid section 70 by the action of a spring 83.

When the excitation coil 73 is energized and the movable iron core 72 is attracted to the fixed iron core 71, the valve element 79 moves by the action of the spring 83, opens the first valve seat 79, seats on the second valve seat 81, and opens the first valve seat 79. 2. Close the valve seat 81. At this time, the compressed air supplied to the intake port 47 passes through the intake passage 76 and the pilot passage 77 to the spool hole 4.
6. Compressed air acts on the spool 90 on the left side end surface in the drawing and on the cylindrical hole 58, but due to the difference in area, the spool 90 is pushed to the right in the drawing, toward the spool piston side. Pilot flow path 56
In the normal state in which the spool 46 is closed, the spool 46 is held at the left end position as shown in the figure by compressed air pressure acting on the cylindrical hole 58. In this normal state, compressed air flows from the air supply port 47 to the second output port 4.
5, it is further supplied to the cylinder 3 from the opening 23 through the flow path 25, and holds the piston 2 in the state shown in FIG.

When the solenoid section 70 is energized, the valve body 79 of the valve section 42 switches the flow path, and when compressed air acts on the pilot flow path 56, the spool 90 moves to the right in the figure, and the air supply port 47 is moved to the third annular position. The first output port 4 is connected to the groove 48 and the second annular groove 53.
Connect with 2. At this time, the third annular groove 48 and the fourth annular groove 54 are closed, and the fourth annular groove 54 and the fifth annular groove 52 communicate with each other, so that the second output port 45 is connected to the second exhaust port 51. The compressed air connected and acting on the piston 2a side of the rotary actuator is discharged. Therefore, the first output port 4
4. As compressed air is supplied through the opening 23 and the flow path 24, the piston 2 of the rotary actuator moves to the left in the figure, and the shaft 8 rotates counterclockwise in FIG.

Although an example has been shown in which one valve body is used as the valve body for the first valve seat 80 and the valve body for the second valve seat 81, two valve bodies can be used separately. Although the figure shows a cartridge-type valve body already proposed by the present applicant in which the valve seat and the valve body are housed in one small frame 84, the present invention is not limited to this.
It may be formed integrally with 8.

When the excitation coil 73 of the solenoid section 70 is deenergized, the movable core 72 moves away from the fixed core 71 by the action of the spring 85, closing the first valve seat 80 and opening the second valve seat 81. As a result, the compressed air acting on the spool 46 through the pilot passage 56 is discharged through the exhaust passage 78. In the illustrated example, the exhaust port is provided in the lid portion 55, and the exhaust path 78 is exhausted from the exhaust port 86 provided in the lid portion 55. At this time, the pressure of the compressed air from the air supply port 47, which is constantly acting on the cylindrical hole 58 of the spool 90, returns to the position shown in the figure and is held to the left in the figure.

In this state, compressed air is supplied from the air supply port 47 to the piston portion 2a side of the cylinder casing 3 through the second output port 45, the opening 23, and the flow path 25, and simultaneously acts on the piston portion 2b side of the cylinder casing 3. Compressed air flows through the flow path 24, the opening 23, the first output port 44, and the first annular groove 5.
0 and the second annular groove 53 through the first exhaust port 49, and the piston 2 is moved to the right in the figure to the position shown in FIG.

In the rotary actuator, there are cases where it is desired to manually move the output shaft 8, such as during a power outage. In such a case, if air pressure is acting on only one of the piston parts 2a and 2b in the cylinder casing 3, the output shaft 8 cannot be easily rotated. At this time, turn the knob 65 of the bypass valve 64 to open the bypass passage 63 and close the first output port 44.
By communicating between the piston and the second output port 45, the forces acting on the piston portions 2a and 2b are balanced within the cylinder casing 3. Therefore, in this state, the output shaft 8 can be easily rotated by hand.

The pilot valve 42 is not limited to the configuration shown in the drawings, and any three-port, two-position switching valve may be used as long as it can be fixed to the main valve 41.

A speed controller 86 can be connected to the first exhaust port 49 and the second exhaust port 51 of the main valve 41 of the electromagnetic valve as shown in FIG.

When the piston 2 is in the normal state shown in FIG. 2 at the position of the pointer in FIG. The output shaft 8 rotates counterclockwise (indicated as left rotation in the figure) and switches to the closed (S) state.

The normal state is closed (S), and the pilot valve section 4
When a device that is switched to open (O) by the energization of solenoid 2 is connected to the output shaft 8, the pointer 19 should be installed at a position 180 degrees off from the position shown in the figure, as shown by the chain line. In this state, counterclockwise rotation of the output shaft 8 switches from closed to open.

Conventionally, the use of a rotary actuator has been limited by attaching a scale plate, but it can be easily adapted to the equipment used by simply changing the attachment position of the pointer 19. Moreover, since the scale is integrally formed on the cylinder casing in advance, it is possible to provide the scale at an accurate position, and the problem of mounting errors that occurs with scale plates in the system of attaching the scale plate later can be solved.

Effects According to the present invention, since the scale plate is integrally formed with the cylinder portion of the rotary actuator, it is possible to accurately indicate the position without causing installation errors.

The rotary actuator has the advantage that it can be used as a common item even for devices whose opening/closing switching direction is reversed by the simple operation of changing the position of the pointer.

[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.
7 is a front vertical sectional view of the rotary actuator shown in FIG. 6, FIG. 8 is a plan view of the rotary actuator with an operating device in which a solenoid valve with a speed controller is fixed as an example of an operating device, and FIG. The figure is a front view of Fig. 8, Fig. 10 is a right side view of Fig. 9, Fig. 11 is a front longitudinal cross-sectional view of a solenoid valve as an operating device, and Fig. 12 is taken along line XII-XII of Fig. 11. FIG. 1...Rotary actuator, 2...Piston,
3... Cylinder casing, 8... Output shaft, 10...
Arm (connection part), 11... Pin (connection part), 22...
Mounting seat, 23... Opening, 24, 25... Channel, 40
...Solenoid valve, 41...Main valve, 42...Pilot valve, 4
4, 45... Output port, 47... Air supply port, 49, 5
1...Exhaust port.

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 connects the pistons and converts the reciprocating linear motion of the piston into reciprocating rotational motion of the output shaft. A protruding pedestal part is provided, the pedestal part has a rectangular outline part and a recessed part surrounded by the outline part, and the recessed part has a surface passing through the center of the output shaft and perpendicular to the axis of the cylinder part. A rotary actuator characterized in that two sets of scales are integrally formed as protrusions at predetermined angular intervals symmetrically about the center, and a pointer is attached to the output shaft so that the attachment position can be changed.