JPS624562B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a stroke length suppression method in, for example, a hydraulically operated rotary actuator.

[Conventional technology]

1 and 2 show a known rotary actuator, in which 1 is a cylinder body, and an end block (fixed vane) 2 is fixed to a part of the inner wall of the cylinder body. 3 is a cover that closes the upper end opening of the cylinder body 1, and 4 is an output shaft that penetrates the cover 3 in an oil-tight manner and is inserted into the cylinder body 1, and is supported inside the cylinder body 1 via bearings 5 and 6. has been done. A movable vane 7 is fixed to a part of the outer periphery of the output shaft, and flanges 8 and 9 are provided in contact with both ends of the movable vane, thereby creating a gap between the end block 2 and the movable vane 7. Arc-shaped cylinder chambers 10a and 10b are formed in the cylinder chambers 10a and 10b.

Then, by alternately supplying working fluid to both cylinder chambers 10a and 10b from a tank (not shown) through working fluid inlets and outlets 11a and 11b provided in the cylinder body 1, the movable vane 7 is moved along with the output shaft 4 to the end block 2. oscillate until it hits. At this time, the working fluid in the cylinder chamber that is not supplied with working fluid is returned to the tank.

The actuator 13 configured in this manner has a first actuator 1 at the tip of the arm 12 of the machine hand, as shown in FIGS. 3 and 4, for example.
3a, and attach the cylinder body 1b of the second actuator 13b to the cylinder body 1a of the first actuator so that its output shaft 4b faces perpendicular to the output shaft 4a of the first actuator. This forms a wrist that can swing left and right and bend up and down, and is used by attaching a welding torch 14 and the like to the output shaft 4b of the second actuator.

The end position of the stroke of such a rotary actuator is determined by the width dimensions of the end block 2 and the movable vane 7, and in order to change this, the above width dimensions must be changed or the position shown in FIGS. As shown in the figure, a pin 15 or torch support rod 1 is fixed to the output shaft 4a of the actuator.
Stopper 17a, 17 provided with 6 on the arm 12 of the machine hand or the cover 3b of the cylinder body
I tried to focus on b. Moreover, the actual public
-In the end block as stated in Publication No. 16519,
A screw hole is provided facing the direction of movement of the cylinder, and a bolt is screwed into the screw hole so that the cylinder touches the tip of the bolt to adjust the stroke.

[Problem that the invention seeks to solve]

Changing the width of the end block or cylinder requires modification of the parts, which is troublesome, and the methods shown in Figures 3 and 4 and the
In the case of the method shown in No. 33-16519, the structure was complicated, which was an obstacle to reducing the size and weight. Moreover, the method shown in Japanese Utility Model Publication No. 33-16519 cannot be applied to rotary actuators.

In view of this point, it is an object of the present invention to provide a method for easily adjusting the stroke end position of a rotary actuator without modifying parts or complicating the structure.

〔Example〕

That is, the method of the present invention, as shown in FIGS. 5 and 6, has two cylinder chambers 10a,
A sphere 18 of a predetermined diameter such as a steel ball is freely inserted into the cylinder chamber 10b or either one of the cylinder chambers, and the movement of the vane 7 is suppressed by the end block 2 via the steel ball 18. be.

[Effect]

Note that the same reference numerals in the drawings as in FIGS. 1 and 2 indicate equivalent parts, and their explanation will be omitted.

With this configuration, when the actuator is operated, the movable vane 7 and the end block 2 of the cylinder are rotated by the sphere 18 in the cylinder chamber 10b, which is not supplied with working fluid, for example.
The movable vane 7 can be stopped in front of the end block 2 by a distance corresponding to the diameter of the sphere 18. Therefore, by varying the diameter of the sphere 18 within a range that does not hinder the movement of the sphere, the stroke end position of the actuator can be adjusted as desired.

Moreover, since the sphere 18 rolls and moves on the inner wall surface of the cylinder chamber, it does not provide any resistance to the operation of the actuator.
There is no possibility that the ball b will be blocked by the sphere 18.

〔Effect of the invention〕

With the method of the present invention, the stroke end position of the rotary actuator can be easily adjusted by simply inserting a sphere with a predetermined diameter into the arc-shaped cylinder chamber, as described above, and it is possible to easily adjust the stroke end position of the rotary actuator. There is no need to provide a complicated stopper mechanism externally, and the practical effect is great.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing a known rocking actuator, FIG. 2 is a cross-sectional view, FIG. 3 is a side view showing an example of how the actuator is used, FIG. 4 is a top view, FIG. FIG. 6 is a vertical cross-sectional view and a cross-sectional view of a rotary actuator showing an example of implementing the method of the present invention. 1...Cylinder body, 2...End block, 3...
Cover, 4...Output shaft, 7...Movable vane, 8, 9...
Tsuba, 10a, 10b...Cylinder chamber, 11a, 11
b... Working fluid inlet/outlet, 13... Actuator.

Claims (1)

[Claims] 1 A spherical body such as a steel ball is freely inserted into an arcuate cylinder chamber formed between a vane that reciprocates and rotates along the inner wall of the cylinder and an end block of the cylinder, and the movement of the vane is controlled by the spherical body. A method for suppressing a stroke length of a rotary actuator, characterized in that the stroke length is suppressed by the end block.