JPS6234006Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cylinder device with a positioner.

In the conventional cylinder device with a positioner, as shown in FIG. An arrangement is utilized in which actuation of the piston, driven by a signal pressure, appropriately switches the flow path of the actuating pressure fluid from the actuating pressure supply port 53 to the ports 55 and 56 of the air cylinder 54. In this case, when the pressure acting on the piston of the positioner valve 52 and the force exerted by the adjustment spring 57 are balanced by the signal pressure, the positioner valve 52 is switched to the neutral position, the supply and discharge of fluid to and from the air cylinder 54 is stopped, and the piston is It is held in that position. For example, when the fluid pressure to the ports 55 and 56 decreases due to a stoppage of the compressor due to a power outage or other troubles, the position of the piston may change due to the influence of load or the like. In order to prevent this, ports 55 and 5 are installed in the flow path.
fluid locking device 5 for locking fluid pressure to 6;
8 is provided. However, in a fluid lock device, the position of the piston is not stable due to the compressibility of the fluid.
There was a problem.

The object of the present invention is to provide a cylinder device with a positioner that can solve the above-mentioned conventional problems and always stabilize the stopping position of the piston.

The present invention achieves the above objectives by creating a cylinder device with a positioner provided with a mechanical locking device.

The details of the invention will be explained with reference to embodiments shown in the figures.

In FIG. 2, the cylinder device with a positioner is the same as the conventional device shown in FIG. , and is further provided with a mechanical locking device 8. A mechanical locking device locks the piston rod 9 of the air cylinder 4.

The mechanical locking device has a main body casing 10 as shown in FIGS. 3, 4 and 5. A cam 12 is rotatably supported in the first through hole 11 of the main body casing 10 by a bearing 13, for example, a needle bearing. The cam 12 has an eccentric hole 14 eccentric to the hole center of the first through hole 11,
The eccentric hole 14 is fitted onto the piston rod 9 with a bush 15 interposed therebetween so as to be relatively rotatable.

The first through hole 11 of the main body casing 10 is connected to the cam 1
2 is installed inside, both open ends are sealed by a rod flange 16 and a mounting flange 17. The rod flange 16 and the mounting flange 17 are each provided with a hole 42 through which the piston rod 9 passes. A bush 18 and a dust wiper 19 are provided in the holes 42 of the rod flange 16 and the mounting flange 17 in the gap between them and the piston rod 9. This allows smooth movement of the piston rod 9 and prevents damage caused by dust.

The mounting flange 17 can be fixed from the outside to the rod cover of the cylinder. It is also possible to fabricate the rod cover of the cylinder and the main body casing 10 as an integral part in advance to create a single cylinder device with a locking device.

An arm 23 is fixed to the cam 12 so as to protrude from its circumferential surface. The arm 23 is screwed and fixed to the cam 12 using, for example, a bolt. A second through hole 20 is formed in the main body casing 10 at a position that does not intersect with the first through hole 11 but is substantially perpendicular to the first through hole 11 . A bolt 23 is inserted into the through hole 20 through the cam 1.
A lock control piston 21 as a driving member that swings in a plane orthogonal to the rotational axis of the lock control piston 21 is swingably inserted into the lock control piston 21. A substantially perpendicular guide hole is formed, into which the bolt 23 is inserted to lock the lock control piston 21.
and bolt 23 are connected. A tube 24 is attached to the bolt 23, and the head of the bolt 23 and the tube 24 are set on substantially the same outer peripheral surface so that the movement of the cam 12 can be controlled smoothly.

A roller 25 is rotatably supported on the lock control piston 21 by a pin 26 with a portion protruding into the guide hole 22. The bolt 23 inserted into the guide hole 22 and fixed to the cam 12 in cooperation with the tube 24 is pressed against the roller 25 by the spring pin 27 .

One end of the second through hole 20 of the main body casing 10 is covered by a cover flange 28, and the other end is covered by a spring cover 29. A spring receiving piece 30 is slidable on the spring cover 29, and a spring pin 3 is attached to the spring receiving piece 30.
1 is provided in a protruding manner in a groove 32 provided in the spring cover 29. A spring 3 is inserted between the spring receiving piece 30 and a spring seat 33 provided on the lock control piston 21.
4 is provided.

A bolt 35, such as a hexagon socket head bolt, is screwed into the spring receiving piece 30, and the spring receiving piece 30 can be adjusted by turning the head of the bolt 35 with a hexagonal wrench or the like through an adjustment hole 36 provided in the spring cover 29. The position can be adjusted and the force of the spring 34 can be adjusted.

The hole provided in the main body casing 10 for inserting the bolt 23 is hermetically sealed by a hole 37 when unnecessary.

In the state shown in FIGS. 3 to 5, the axis of the piston rod 9 of the cylinder and the eccentric hole 1 of the cam 12 are
Since the axes of the two pistons 4 coincide, the piston rod 9 can move freely. At this time, fluid is supplied from the passage 38 of the cover flange 28 to the side of the lock control piston 21 where the spring 34 is not provided, that is, to the left side in the figure, and the lock control piston 21 is moved by a slight amount against the spring force. , where it is held by fluid pressure.

When the amount of movement of the lock control piston 21 increases, the axis of the eccentric hole 14 of the cam 12 no longer coincides with the axis of the piston rod 9.
This results in reciprocating motion while applying unreasonable force. In order to avoid this, a cam stop positioning pin 39 is attached to the main body casing 10 by screwing. The position of the cam stop positioning pin 39 is adjusted so that the cam stop positioning pin 39 is held in contact with the pin 39 at a predetermined position.

When the fluid acting on the lock control piston 21 is discharged, the lock control piston 21 is moved to the left in the drawing by the action of the spring 34, and the cam 12 is moved counterclockwise in the drawing via the bolt 23 to the state shown in FIG. Rotate until. In this state, the center of the eccentric hole 14 of the cam 12 moves upward in the figure so as to approach the rotation center of the cam 12. Here, the piston rod 9 is locally subjected to an upward bending force in the figure through the bush 15, and is in a so-called broken state and locked in a state where it cannot be moved.

When it is desired to release the lock of the piston rod 9, fluid pressure is applied to the lock control piston 21 as described above, and the cam 12 is rotated to the state shown in FIG.

This invention makes it possible to stop and hold the piston rod in any position quickly and accurately by using a simple locking device incorporating a cam and a piston that moves the cam. Since the piston rod is mechanically locked, the piston rod can always be securely held in a fixed position even if the fluid pressure in the cylinder fluctuates.

The embodiment of the present invention is a locking mechanism for a cylinder with a positioner that performs reciprocating linear motion, but it is not limited to this, but it can also be used to control rotating equipment that performs rotational motion, such as a vane motor equipped with a positioner. Available for use.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a cylinder device with a positioner equipped with a conventional locking device, FIG. 2 is an explanatory diagram of a cylinder device with a positioner according to the present invention, and FIG. 3 is a partially sectional side view of the cylinder device according to the present invention. , Fig. 4 shows - of Figs. 3 and 5.
FIG. 5 is a cross-sectional view showing only the locking device shown in FIG. 3, and FIG. 6 is a view corresponding to FIG. 4, showing the locked state. 2...Positioner, 4...Cylinder, 8...Lock device, 9...Piston rod, 12...Cam, 21
...Piston (biasing means).

Claims (1)

[Scope of utility model registration request] In a cylinder device having a positioner that is activated by an external signal and switches the flow path to the cylinder device to arbitrarily stop the piston,
A locking device for mechanically locking the piston rod is provided, and the locking device includes a cam that is movably mounted on the piston rod of the cylinder device, and that the cam is rotatable about an axis eccentric with respect to the piston rod. The cam is characterized by having a main body casing supported by the cam, an arm protruding and fixed to the circumferential surface of the cam, and a driving member connected to the arm and swinging the arm in a plane orthogonal to the cam axis. Cylinder device with positioner.