JPS6023607A - Stroke length control method for rotary actuator - Google Patents

Abstract

PURPOSE:To simplify adjustment of the stroke end position of an actuator by putting globes such as steel balls movably into a cylinder room. CONSTITUTION:Globes 18 of a predetermined diameter such as steel balls are movably put in the cylinder rooms 10a, 10b of an actuator. By changing the diameter of the globe 18 variously, the stroke end position of the actuator can desirably adjusted, and simple adjustment can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for adjusting the stroke end position of, for example, a hydraulically operated rocking actuator.

1 and 2 show a conventional swing type 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
4 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 a bearing 5.6. This output shaft has a movable vane 7 on a part of its outer circumference.
is fixed, and flanges 8.9 are provided in contact with both ends of the movable vane, so that cylinder chambers 10a, 10b are formed between the end block 2 and the movable vane 7.
is formed.

A working fluid inlet/outlet 11a is provided in both cylinder chambers 10a, 10b from a tank (not shown) to the cylinder body 1.
, 11b and alternately supplying the working fluid, the movable page 77 swings together with the output shaft 4 in a groove in contact with the end block 2. 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 way is, for example, a third actuator.
The arm 12 of the machine hand as shown in FIG.
The output one piece 4a of the first actuator 13a is connected to the tip of the cylinder body 1a of the first actuator.
Attach the cylinder body 1b of the second actuator 13b so that its output shaft 4b faces perpendicularly to the output shaft 4a of the first actuator to form a wrist that can swing left and right and bend in the vertical direction, The second actuator is used by attaching a welding torch 14 or the like to the output shaft 4b.

In such a conventional structure, the end position of the stroke of the actuator is determined by the middle dimensions of the end block 2 and the movable vane 7, and in order to change this, the width dimension described above must be changed, or the position shown in FIGS. 3 and 4 can be changed. As shown in the figure, the bottle 15 is fixed to the output shaft 4a of the actuator.
Or a stopper 17 in which the torch support rod 16 is provided on the arm 12 of the machine hand or the cover 3b of the cylinder body.
a, 17bK4 I was trying to do it.

Therefore, in the former case, the change requires modification of parts, which is troublesome, and in the latter case, the structure is complicated, which is an obstacle to reducing the size and weight.

In view of this point, the present invention is designed to easily adjust the stroke end position of the actuator without modifying parts or complicating the structure.

That is, the present invention is characterized in that a sphere 18 of a predetermined diameter, such as a steel ball, is freely inserted into both cylinder chambers 10a, 10bl or one of the cylinder chambers of the actuator as shown in FIGS. 5 and 6. That is.

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 cylinder chamber that is not supplied with working fluid, for example, one
The sphere 18 in 0b is placed between the rotating movable vane 77 and the end block 2 of the cylinder, and the movable vane 7 is stopped in front of the end block 2 by a distance corresponding to the diameter of the sphere 18. be able to. Therefore, sphere 1
The stroke end position of the actuator can be arbitrarily adjusted by varying the diameter of the ball 8 within a range that does not hinder the movement of the sphere.

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, and the working fluid inlets and outlets 11a and 11b provided on the end side wall of the cylinder chamber are shaped like spheres. There is no fear that it will be blocked by 18.

Note that the number of spheres 18 to be inserted into the cylinder chamber is not limited to one, but it is also possible to insert a plurality of spheres with a diameter close to the width of the cylinder chamber (in this way, the adjustment range can be further expanded). You can expand your schedule.

As described above, the present invention allows the stroke end position of the actuator to be easily adjusted by simply inserting one or more spheres of a predetermined diameter into the cylinder chamber, and does not require the modification of conventional parts or complex structures. There is no need to provide an external stopper mechanism, which has a great practical effect.

Note that the present invention can also be applied to reciprocating actuators.

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view showing a conventional swing type actuator.
Figure 2 is a cross-sectional view, Figure 3 is a surface view showing an example of how the actuator is used, Figure 4 is a top view (2), and Figures 5 and 6 correspond to Figures 1 and 2. 1 is a drawing showing an embodiment of the present invention. 1 Niji cylinder body, 2... End block 3: Cover, 4: Output shaft, 7... Movable vane, 8.9 = Tsuba, 1
0a, 10b Nijilinda chamber, 11a, 11o Figure 1 Ya Figure 4

Claims (1)

[Claims] A stroke end position adjusting device for an actuator, characterized in that a spherical body such as a steel ball is freely inserted into a cylinder chamber formed between a piston or vane that reciprocates along the inner wall of the cylinder and an end block of the cylinder.