JPH06246385A - Mandrel collecting device with control valve to be provided on air riveter - Google Patents

Abstract

(57) [Summary] [Purpose] By incorporating a control valve into the mandrel collecting device of the air riveter, the air supply can be cut off by a simple rotation operation to prevent wasteful consumption of the air, and it is also a retrofit type. It can be suitably used for the mandrel collecting device. [Objective] A unit is constructed by combining a vacuum means (21) for depressurizing and vacuuming the internal passage (15) by air injection to suck and discharge the mandrel to the rear side, and a control valve (30) for controlling the supply of air to the vacuum means (21). To do. The control valve 30 is used for the air circulation unit 26 to the vacuum means 21.
It has an inner ring 31 having an outlet hole 33 communicating with the inner ring 31, and an outer ring 32 for rotational operation loosely rotatably fitted outside the inner ring 31 with a gap 34 for air circulation. Outer ring 32
Is provided with an air inlet 36 from the sub-pipe 35, and a ball-shaped valve body 38 elastically pressed inward by a spring 37. The inner ring 31 and the outer ring 32 are rotated relative to each other. When the valve body 38 is matched with the outlet hole 33 of the inner ring 31 by operation, the air supply is cut off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for collecting used mandrels that have been pulled and used in an air rivet used for mounting blind rivets, and more particularly to a mandrel collecting device with a control valve.

[0002]

2. Description of the Related Art A tool in which a mandrel of a blind rivet is attracted by a piston action operated by using air pressure as a power source and a rivet is attached to a work, that is, an air riveter is a tool. It is desirable to provide a means for effectively removing used mandrels from the chuck area of the tip.

As a means for this, a collecting container is attached to the rear end of the riveter body, and the internal passage leading from the tool tip to the collecting container is depressurized to vacuum so that the used mandrel is sucked to the rear side. Some of them are equipped with a mandrel collecting device that discharges them into a collecting container.

For example, in US Pat. No. 4,281,531, air serving as a power source for a rivet mounting mechanism is used, and a part of the air is supplied to a vacuum means of the collecting container through a sub-pipe so that the inside is It is shown that the mandrel is discharged into the collection container and collected by applying a vacuum inside the collection container through the passage.

By the way, if air is constantly supplied to the vacuum means, the air is wasted. Therefore, it is desirable to shut off the air supply to the vacuum means to eliminate the function of the mandrel collector except when the rivet is mounted.

From the beginning, a part of the type in which the mandrel collecting device is integrally incorporated in the riveter body is
For example, as disclosed in Japanese Patent Application Laid-Open No. 2-235541, a device having a valve for controlling the above air supply has also appeared.

However, the control valve disclosed in the above publication is provided at the bottom of the pneumatic cylinder for operating the rivet mounting mechanism, and it is difficult to say that it is easy to operate, and it is manufactured without the mandrel collecting device incorporated. It is difficult to use the air riveter for installing a mandrel collecting device by retrofitting.

In particular, most of the retrofitted mandrel collectors do not have the function of controlling the air supply. Even if the mandrel collector has a control function, the means for supplying the air is Either a commercially available comparatively large valve is installed in the middle of the auxiliary pipeline or a valve with a knob that applies a needle valve, and it is difficult to operate positionally. It is necessary to rotate it 10 times or more, and it is difficult to say that it is easy to operate.

The present invention has been made in view of the above, and by integrally incorporating a control valve for air supply in a mandrel collecting device of an air riveter, the air supply can be controlled by a simple operation. (EN) A mandrel collecting device with a control valve, which can be preferably implemented even in a mandrel collecting device to be attached later.

[0010]

SUMMARY OF THE INVENTION The present invention is an air rivet that pulls a mandrel of a blind rivet by a piston action using air pressure as a power source to attach a rivet, and discharges the pulled mandrel to a rear portion through an internal passage. A mandrel collector with a control valve provided at the rear of the riveter, which controls the vacuum means for decompressing and vacuuming the internal passage by air injection to suck and discharge the mandrel to the rear side, and the supply of air to the vacuum means. And a control valve, which are integrally combined and configured as a unit.

The control valve in the above is arranged outside the air circulation portion to the vacuum means, and is connected to an inner ring formed by radially extending an outlet hole communicating with the air circulation portion and an air supply pipeline. It has an air inlet from the auxiliary pipe and a ball-shaped valve body elastically pressed by an elastic means so as to be displaceable in the inner core direction, and has a gap for air circulation outside the inner ring. And an outer ring fitted so as to be rotatable relative to each other, and the relative rotational operation of the inner ring and the outer ring causes the air flow when the ball-shaped valve body matches the inlet / outlet of the inner ring. Those configured so as to cut off the supply are particularly preferable.

In the above description, it is preferable that the annular frame for holding the vacuum means inside is integrally formed so as to also serve as the inner ring of the control valve, and the annular frame is provided so that it can be connected to the riveter body.

[0013]

According to the mandrel collecting device with the control valve described above, when the mandrel of the blind rivet is pulled by the piston action using the air pressure as a power source to set the rivet, the control integrated with the mandrel collecting device is performed. It is possible to easily control the supply and cutoff of air to the vacuum means by operating the valve.

For example, in the case of the control valve according to the second aspect, when the ball-shaped valve element provided inside the outer ring is positioned away from the outlet hole provided in the inner ring, the air as a power source The air supplied by the auxiliary pipe connected to the supply pipe flows into the gap between the inner ring and the outer ring through the inflow port, passes around the ball, and exits from the inner ring through the vacuum means. It flows to the air circulation part to the vacuum means. Therefore, the internal passage of the riveter is evacuated toward the rear side, and the suction and discharge operations of the mandrel are performed as usual.

When the ball-shaped valve body is aligned with the position of the outlet hole of the inner ring by the relative rotation operation of the inner ring and the outer ring, the valve body presses the outlet hole by the pressing force of the elastic means. In the closed state, the air flows into the gap between the inner ring and the outer ring, but is prevented from flowing inward from the outlet hole. That is, the supply of air to the vacuum means is blocked. Therefore, the mandrel collecting device can be held in a non-functioning state, and useless air release is prevented.

[0016]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 shows the overall structure of an air riveter (A) equipped with a mandrel collector with a control valve.

The air riveter (A) pulls a mandrel of a blind rivet (not shown) by a piston action using air pressure as a power source and attaches the rivet to the work piece. The rivet setting mechanism and its operation are basically the same as the conventional ones, and the piston (2) provided inside the rivet body (1) operates the rivet setting mechanism.

The outline will be described with reference to FIG.

A chuck means (3) such as a jaw chuck capable of chucking the rivet mandrel is provided at the tip of the riveter body (1), and its chuck guide (4) is connected to the piston rod (5). . The piston (2) is housed in the cylinder area (6) and is biased to the left in FIG. 1 by a spring (7).

Further, the grip portion (1) of the riveter body (1) is
A hydraulic fluid (8) is contained inside a). An air pressure cylinder (10) having a piston (9) that acts on the hydraulic fluid (8) is provided below the grip portion (1a). An air supply conduit (13) is connected to an air inlet (11) of the cylinder (10) via a valve mechanism (12).

In the operation, when the valve mechanism (12) is opened by the operation of the operation piece (14) such as the handle, air flows into the cylinder (10) and the air pressure acts on the piston (9). , Push up the piston (9). By this upward movement of the piston (9), the hydraulic fluid (8) flows into the cylinder region (6), and the piston (2) is moved rightward in FIG. 1 against the biasing force of the spring (7). . By this movement of the piston (2), the chuck means (3) chucks and pulls the mandrel of the rivet, and attaches the rivet to the workpiece. Finally, the mandrel is cut off and sucked through the internal passage (15) by the rear mandrel collector (20) and discharged to the rear.

The mandrel collecting device (20) is a joint member (17) screwed to the rear end of the riveter body (1), for example, a frame cap (16) provided at the rear end as shown in the figure. Mounted by.

This mandrel collecting device (20) is a vacuum means (2) for sucking and discharging the mandrel toward the rear side by decompressing and vacuuming the internal passage (15) by jetting air.
1), a container (22) as a means for collecting discharged mandrels, and a control valve (30) for controlling the supply of air to the vacuum means (21), which are integrally combined and configured as a unit. Has been converted.

(23) is a vacuum means (21) inside
Is an annular frame for holding. This annular frame (2
3) is a cylindrical portion (2) that also serves as an inner ring of a control valve (30) described later.
3a) and a flange portion (23b) at the rear end. The collection container (22) is detachably attached to the flange portion (23b) by a mounting plate (29) screwed to the flange portion (23b).

A first nozzle member (24) and a second nozzle member (25) are provided inside the tubular portion (23a), and the internal passage (15) is formed by jetting air utilizing the principle of the Venturi tube. Vacuum means (2
1) is configured.

That is, the air circulation portion (26) between the annular frame (23) and the first nozzle member (24).
When the air that has flowed into the first nozzle member (24) flows into the flow gap (28) between the nozzle members (24) and (25) through the flow hole (27) provided in the first nozzle member (24), the rear side of the gap (28). The flow velocity is accelerated at a portion where the end is narrowed, and the fuel is injected at a high speed toward the inner passage (15) obliquely rearward. By this air injection, the internal passage (15) is evacuated, and the mandrel is sucked toward the rear side and discharged into the container (22). The container (22) is provided with a vent hole (22a) through which air is released.

The control valve (30) has an inner ring (31) on the fixed side and an outer ring (32) for operation, and has an air flow section (26) to the vacuum means (21). ) And is formed integrally with the vacuum means (21).

In the case of the figure, the tubular portion (23a) of the annular frame (23) is the inner ring (31) on the fixed side of the control valve (30).
It is integrally formed so as to also serve as the cylinder part (23a).
The air circulation part (2) to the vacuum means (21) inside
One outlet hole (33) leading to 6) is formed.

An outer ring (32) for operation is rotatably fitted to the outside of the cylindrical portion (23a) with a gap (34) for air circulation. The outer ring (32) is a joint member (1) screwed to the tip of the tubular portion (23a).
It is positioned between 7) and the flange portion (23b).

The outer ring (32) has an air supply conduit (1
An air inlet (36) from a sub-pipe (35) connected to 3) is provided, and a spring (37), which is an elastic means, elastically presses the inner peripheral side of the auxiliary pipe so as to be displaceable in the inward direction. A ball-shaped valve body (38) is provided.

The valve body (38) is located at a position corresponding to the outlet hole (33) in the axial direction when the outer ring (32) is fitted in the inner ring (31), that is, the cylindrical portion (23a). It is provided. The diameter of the valve body (38) is the same as that of the outlet hole (3
It is larger than the diameter of 3).

Therefore, when the outer ring (32) is rotated, the valve body (38) is separated from the outlet hole (33) (the state shown in FIG. 4) and the outlet hole (33) is aligned with the outlet hole (33). (33) can be switched to a closed state.

In particular, in the case of the drawing, radial storage holes (39) are provided at a plurality of locations (three locations in the figure) at equal angular intervals in the circumferential direction of the outer ring (32). The ball-shaped valve element (38) and the spring (37) are housed in 39), and the withdrawal is prevented by a screw member (40) screwed into the outer end of the housing hole (39). By arranging a plurality of valve bodies (38) in this way, a good balance is achieved when the outer ring (32) is rotated with respect to the inner ring (31), and the outlet hole (33) is opened and closed with a small rotation angle. It is possible and preferable.

According to the mandrel collecting device (20) including the above control valve (30), the outer ring (3) of the control valve (30) is provided.
The air supply to the vacuum means (21) can be easily controlled by the switch-like rotation operation by 2).

That is, when the ball-shaped valve body (38) inside the outer ring (32) for operation is removed from the outlet hole (33) in the cylindrical portion (23a) which also serves as the inner ring (31). Means that the air flowing from the inflow port (36) into the gap (34) through the sub-pipe (35) passes around the valve body (38) and is discharged from the outlet hole (33) of the cylindrical portion (23a) to the vacuum means. The vacuum means (21) works by flowing to the air circulation part (26) to (21), and the suction and discharge operations of the mandrel are performed as usual. The discharged mandrels are collected in a container (22).

Then, by rotating the outer ring (32) relative to the inner ring (31), the ball-shaped valve body (38) is aligned with the position of the outlet hole (33). Becomes a state in which the outlet hole (33) is closed by the pressing force of the spring (37), and the outflow of air from the outlet hole (33), that is, the supply of air to the vacuum means (21) is blocked. It

Therefore, the mandrel collecting device can be kept in a non-functioning state. Therefore, it is possible to prevent wasteful discharge of air when the rivet mounting operation is stopped or when the mandrel collected in the container (22) is taken out.

The valve body (38) is not limited to a ball-shaped one as shown in the figure, but a shape capable of closing the outlet hole (33) by rotating the outer ring (32), for example, a hemispherical shape. The shape may be a truncated cone shape or the like, but a ball shape as shown in the drawing is particularly preferable from the viewpoint of easiness of rotation operation and the like. Further, as the elastic means for elastically pressing the valve body, an elastic body other than the spring, such as rubber or elastic foam, may be used.

Further, in the above-mentioned embodiment, the tubular portion (23a) of the annular frame for holding the vacuum means (21).
Is configured so as to also serve as the inner ring (31) of the control valve (30). This inner ring (31) is used as the annular frame (23).
It is also possible to make a different configuration from the above and to combine them. Alternatively, the inner ring (31) may be configured to rotate relative to the outer ring (32).

Further, as a collecting means, the container (22) is removed and the rear end portion (2) of the first nozzle (24) is protruded.
It is also possible to directly connect a chute for recovery to 4a).

[0042]

As described above, according to the present invention, it is possible to easily control the supply and interruption of air to the vacuum means by a simple operation by the control valve incorporated in the mandrel collecting device in the air riveter, and when it is not necessary. It is possible to suppress unnecessary air consumption by eliminating the air supply in the above.

Further, since the control valve is integrally built into the mandrel collecting device, it is smart in appearance, inconspicuous, and in a position where it is easy to operate, and can be easily operated even while installing the rivet. . In particular, it can be suitably applied to a device provided with a mandrel collecting device by retrofitting.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a part of the same mandrel collecting device separated from the riveter body.

FIG. 3 is an enlarged sectional view showing a portion of a control valve and a vacuum means.

FIG. 4 is a cross-sectional view taken along line YY of the above.

[Explanation of symbols]

 (A) Air riveter (1) Riveter body (2) Piston (3) Chuck means (13) Air supply conduit (15) Internal passage (20) Mandrel collecting device (21) Vacuum means (22) As mandrel collecting means Container (23) Annular frame (23a) Cylindrical part (23b) Flange part (26) Air distribution part (30) Control valve (31) Inner ring (32) Outer ring (33) Outlet hole (34) Gap (35) Sub-pipe (36) Air inlet (37) Spring (38) Ball valve

Claims (3)

[Claims] 1. An air rivet that pulls a mandrel of a blind rivet by a piston action using air pressure as a power source to attach a rivet, and discharges the drawn mandrel to a rear part through an internal passage. It is equipped with a vacuum means for decompressing and vacuuming the internal passage by jetting air to suck and discharge the mandrel to the rear side, and a control valve for controlling the supply of air to the vacuum means, which are integrally combined. A mandrel collecting device with a control valve provided in an air riveter, which is configured and unitized. 2. The mandrel collecting device with a control valve provided in the air riveter according to claim 1, wherein the control valve is arranged outside the air circulation part to the vacuum means, and has an outlet hole communicating with the air circulation part. An inner ring formed by passing through in the radial direction, an air inlet from a sub-line connected to the air supply line, and a ball-like member elastically pressed so as to be displaceable in the inner direction by elastic means. A valve body, and an outer ring fitted outside the inner ring so as to be rotatable relative to each other with a gap for air circulation, the relative rotation operation of the inner ring and the outer ring A mandrel collecting device with a control valve provided in an air riveter, characterized in that the air supply is shut off when the valve body matches the outlet hole of the inner ring. 3. An annular frame for holding the vacuum means inside thereof is integrally formed so as to also serve as an inner ring of the control valve, and the annular frame is adapted to be connected to the riveter body. Mandrel collecting device with control valve installed in the Air Riveter.