JPH08118193A - Air blowing device using double-acting air cylinder - Google Patents

Abstract

PURPOSE: To heighten the exhaust pressure of a double-acting cylinder so as to be able to use the exhaust air as air blow by connecting an air blowing pipeline to the exhaust side of the double-acting cylinder, and providing a shock absorber, actuated in the vicinity of both ends of the travel of the double-acting cylinder, on the driven body side. CONSTITUTION: The collars 7, 8 of a shock absorber 10 are spaced, and a movable cylinder 12 moves rapidly without the action of the shock absorber 10 until reaching the vicinity of the ascent end. Exhaust air exhausted from a lower chamber 12b is thereby blown off from the tip of an air blowing circuit 20 while keeping sufficient exhaust pressure to clean a desired place. When the movable cylinder 12 reaches the vicinity of the ascent end, the collar 7 of a rod 6 comes in contact with the upper face of an arm 5 to actuate the shock absorber 10, and a driving shaft 13 is slowly stopped, so that there is no fear of displacement and falling of a piston supported on the upper end.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air blow device utilizing the exhaust pressure of a double-acting air cylinder.

[0002]

In Japanese Patent Laid-Open No. 1-281840, a work piece mounted on a table of a machine tool is tilted after finishing the work, and a squeezing fluid is applied to a chip adhering to the tilted work piece by a nozzle. A device is described for spraying and removing chips from the work piece.

FIG. 2 shows a conventional cylinder unit used in an apparatus for assembling a piston ring to a piston. Reference numeral 11 denotes a ring cup on the outer peripheral surface of which a piston ring is supplied from a ring magazine (not shown) by a cutting plate, and a drive shaft 13 fixed to a movable cylinder 12 moves up and down in the ring cup 11,
A piston supported by a piston receiver mounted on the upper end of the ring cup 3 is moved so that a desired piston ring mounting groove is exposed from the upper end surface of the ring cup 11, and the piston is supplied to the outer peripheral surface of the ring cup 11 in the mounting groove. Ring
The piston ring is assembled in the piston groove by pushing up the upper end surface of the ring cup 11 with a pushing claw (not shown). The movable cylinder 12 of the double-acting air cylinder is attached to the fixed rod 14, and its upper chamber 12
A supply / exhaust circuit is connected to each of a and the lower chamber 12b via a speed control valve 15.

In FIG. 2, air is supplied to the upper chamber 12a of the movable cylinder 12 of the double-acting air cylinder as indicated by the solid line arrow so that the movable cylinder 12 rises along the fixed rod 14 and the lower portion of the movable cylinder 12 is lowered. The chamber 12b is exhausted as shown by the broken line arrow in the figure. At this time, the movement of the movable cylinder 12 is caused by the speed control valve 15 including the throttle and the check valve.
Since the drive shaft 13 is moved through the shaft, the movement of the drive shaft 13 is performed gently without any impact, but the exhaust pressure becomes low.

When the piston rings are sequentially assembled in the piston groove by the above-mentioned piston ring assembling device, ring cracks and abrasion powder due to sliding between the ring cup 11 and the drive shaft 13 are generated, and these are caused by the drive shaft. It collects in the lower part of 13 and the sliding surface of the movable cylinder 12 and the rod 14.
Conventionally, the crack ring and the abrasion powder are blown off by using an air blower installed separately.

[0006]

In the above-described chip removing device and piston ring assembling device, an independent air blower is required to remove the cutting chips and the like. The present invention
The exhaust of a conventional double-action air cylinder with a speed control valve could not be effectively used as an air blow because of its low exhaust pressure, but the exhaust is used as an air blow by increasing the exhaust pressure of the double-action air cylinder. It is possible to provide an air blowing device at low cost.

[0007]

SUMMARY OF THE INVENTION The present invention is an apparatus for directing air from an air source to a double-acting air cylinder through a directional control valve and operating the double-acting air cylinder to reciprocally drive a driven body. , An air blow using a double-acting air cylinder in which a pipe for air blow is connected to the exhaust side of the double-acting air cylinder, and a shock absorber that operates near both ends of the stroke of the double-acting air cylinder is provided on the driven body side. It is a device.

[0008]

When the double-acting air cylinder is operated, air is introduced into one chamber of the cylinder, and air in the other chamber is discharged through the directional control valve. In this case, since the air cylinder moves rapidly, the exhaust gas discharged can be used for cleaning the desired part through the air blow pipe while maintaining sufficient exhaust pressure, and the shock absorber operates at the end of the stroke of the air cylinder. Thus, the impact caused by the rapid movement of the driven body is mitigated.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a part of an embodiment of the present invention in section. The cylinder unit for mounting the piston ring on the piston has substantially the same structure and operation as the conventional cylinder unit shown in FIG. 2, and the ring cup 11 and the rod 14 are designated by the same reference numerals. . Directional switching valve 3, which is connected from the air source 1 in series
4, and the outlet sides of the directional control valves 3 and 4 are connected to the upper chamber 12a and the lower chamber 12b of the movable cylinder 12, respectively. In this case, without using the speed control valve 15 (FIG. 2) installed in the drive circuit of the conventional double-acting air cylinder,
The movable cylinder 12 is driven by direct air supply.

On the other hand, air is supplied from the air source 1 to the control units of the direction switching valves 3 and 4 via the switching valve 2. FIG.
Shows the state where the double-acting air cylinder is in the process of rising, and the solid line shows the operating air circuit. The broken line shows an air circuit for switching the switching valve 2 so that the directional switching valves 3 and 4 lower the movable cylinder 12, and the alternate long and short dash lines 20 and 21 connect a pipe or a hose to the exhaust ports of the directional switching valves 3 and 4, respectively. The air blow circuit is shown.

The rods 6 of the shock absorber 10 are loosely fitted in the holes provided in the arms 5 of the double-acting air cylinder 12, and the collars 7 and 8 formed at intervals on the rods 6 have upper and lower surfaces of the arms 5. To engage with. A speed control valve 16 including a throttle and a check valve is connected to the upper chamber and the lower chamber of the shock absorber 10 in a closed circuit.

Next, the operation of the air blow device will be described. In the ascending process of the double-acting air cylinder shown in FIG. 1, air is introduced into the upper chamber 12a of the movable cylinder 12 and the lower chamber 1
The air of 2b is discharged through the direction switching valve 4. In this case, the collars 7 and 8 of the shock absorber 10 are spaced apart from each other, and the movable cylinder 12 remains until the movable cylinder 12 reaches near the rising end thereof.
The exhaust gas discharged from the lower chamber 12b maintains a sufficient exhaust pressure and moves rapidly without operating.
Blow out from the tip of the to clean the desired part. When the movable cylinder 12 reaches near its rising end, the collar 7 of the rod 6
Since the shock absorber 10 is actuated by hitting the upper surface of the arm 5 and the drive shaft 13 is gently stopped, there is no risk of displacement or dropping of the piston supported at the upper end thereof.

When the switching valve 2 is switched to the chain line state, air is introduced into the lower chamber 12b of the movable cylinder 12 and the upper chamber 12
The air of a is discharged through the direction switching valve 3. When the movable cylinder 12 descends, the exhaust gas discharged from the upper chamber 12a is blown out from the tip of the air blow circuit 21 while maintaining a sufficient exhaust pressure to clean a desired portion. The collar 8 of the rod 6 hits the lower surface of the arm 5 near the lower end of the movable cylinder 12, the shock absorber 10 operates, and the shaft 13 stops gently.

In the above-mentioned embodiment, the case where the invention is applied to the cylinder unit for assembling the piston ring to the piston has been described. However, in the general device using the double-acting air cylinder, the exhaust air of the air cylinder is used as the air blow. Of course you can. Although the double-acting air cylinder is shown as a movable cylinder, it is of course applicable to a double-acting air cylinder in which a fixed cylinder is used and a rod is movable. Not limited to the above, a spring type or the like can be used.

[0015]

According to the present invention, the exhaust of the conventional double-acting air cylinder with a speed control valve cannot be effectively used as an air blow because of its low exhaust pressure. There is no speed control valve in the engine, and the exhaust speed can be increased to increase the exhaust pressure so that the exhaust gas can be used as an air blow.On the other hand, the shock that accompanies the rapid movement of the driven body is installed on the driven body side. Since it is absorbed, the air blow device can be provided at low cost by utilizing the exhaust air of the double-acting air cylinder.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a cross section of a part of an embodiment of the present invention.

FIG. 2 is an explanatory view of a device using a conventional double-acting air cylinder with a speed control valve.

[Explanation of symbols]

1 Air Source 2 Changeover Valve 3, 4 Directional Changeover Valve 5 Arm 6 Rod 7, 8 Tsuba 10
Shock absorber 12 Movable cylinder 13 Drive shaft 14 Fixed rod 15, 16 Speed control valve

Claims (1)

[Claims] 1. An apparatus for directing air from an air source to a double-acting air cylinder via a direction switching valve to operate the double-acting air cylinder to reciprocally drive a driven body, the exhaust of the double-acting air cylinder. An air blower using a double-acting air cylinder, wherein a pipe for air-blowing is connected to the side, and a shock absorber that operates near both ends of the stroke of the double-acting air cylinder is provided on the driven body side.