JPH0657390B2 - Nozzle swing device for sandblasting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an oscillating sand blasting machine for injecting a cleaning agent onto a floor surface or a wall surface to perform a surface treatment for coating, cleaning of a corroded surface, and the like. In addition, the present invention relates to an improvement of a rocking device that rocks a jet nozzle back and forth.

(Prior Art) The applicant has previously proposed an apparatus for moving a blasting machine while rocking an injection nozzle of a sandblasting machine to perform a cleaning treatment on a surface to be polished with a band width of the injection nozzle (Japanese Patent Publication Sho 53-53-
6398, ibid. 6399).

As shown in FIG. 6, the device includes a jet nozzle (3) and a bearing (6
Injection chamber that is swingably supported to 1) and is covered by the casing
At the same time as injecting a mixed flow of abrasive and cleaning material toward the front opening of (11), move the machine base.

The rod (64) is projected from the injection nozzle (3) in the direction orthogonal to the center of the bearing, and the tip of the rod (64) is reduced through the crank (63) to the reduction motor.
It is connected to (62), and the rotation of the motor is converted into reciprocal oscillation by the crank (63) to reciprocally oscillate the injection nozzle (3).

Although the device has a significant improvement in efficiency as compared with the case where the surface to be treated is manually cleaned, since the motion of the injection nozzle converts the rotation of the motor into a reciprocating linear motion by the crank (63), The instantaneous rocking speed of the injection nozzle changes every moment. Therefore, the speed at the moment of passing the center point of the swing is the highest, and therefore the scouring is lightly performed. On the other hand, at the oscillating end, the jet nozzle has the slowest moving speed before and after the change of direction, and has a time to stop temporarily, so that the blasting is excessively performed.
Therefore, it was found that when the conventional blasting machine was used for blasting, there was unevenness in the finish of blasting.

(Purpose) The present invention clarifies a sandblasting machine that reduces blast unevenness on a surface to be processed as much as possible.

(Structure) The injection nozzle (3) of the sandblasting machine is connected to the drive shaft (44) of the rocking device (4) that rotates at a substantially constant speed and is capable of switching the rotation direction, and is connected to the injection nozzle (3). A detector for detecting the swinging end of the injection nozzle (3) is provided between the base and the swinging device (4), and the rotation direction of the drive shaft (44) is alternately switched. Then, the injection nozzle (3) is reciprocally rotated at a substantially constant speed over the entire angle of the swing range.

(Effect) Since the injection nozzle is connected to the drive shaft that rotates at a constant speed,
The speed at which the spray nozzle passes through the center of swing and the angular velocities before and after it changes direction at both ends are almost the same, so the polishing process is more uniform than the swing of the spray nozzle by the conventional crank mechanism over the entire width of the sweep. Is performed.

(Examples) Examples described below are for explaining the present invention, and therefore, the invention described in the claims is limited to
Or do not interpret it as if it were reduced.

The sandblasting machine shown in the drawings is a device that is used for scouring and cleaning a vertical wall surface of a ship hull, a structure such as a building, or a floor surface. An opening is provided in the center of the machine base, and a side surface and an upper surface above the opening are covered with a casing (1),
It forms an injection chamber (11) that is open toward the front. A flange (18) is projected outward from the casing opening, and a plurality of wheels (13) are mounted on the flange to move on the surface to be processed, and the injection chamber opening is supported at a constant height above the surface to be processed. ing. A flexible seal rubber (12) is attached around the flange (18) to prevent dust-containing air from the injection chamber (11) from flowing out.

The rotating shaft (2) freely rotatably penetrates both side walls (10) of the casing (1), the side wall penetrating portion is supported by the sliding bearing (20), and the bearing portion is airtightly held by the V ring (21). To do. Intake pipe (15) with intake port (14) on the side of injection chamber (11)
By connecting the suction hose (19) to the suction pipe (15), the abrasive cleaning material sprayed into the spray chamber (11) and the dust separated from the surface to be treated are sucked and further sprayed. The inside of the chamber (11) is maintained at a negative pressure, and the effect of pressing the sandblast machine against the surface to be processed is generated by atmospheric pressure.

A cam (45) and a reciprocating rocking device (4) described later are attached to one end of the rotary shaft (2) penetrating the side wall (10) to reciprocally rotate the rotary shaft within a range of about 90 degrees. . An inflow hole (22) extending from the end face into the injection chamber (11) along the axial center is formed at the other end of the rotary shaft, and is orthogonal to the axial center of the rotary shaft in the injection chamber. A mounting screw hole (23) in the radial direction and a mounting screw hole (24) oblique to the axis of the rotating shaft are formed from the peripheral surface on the opposite side of the mounting screw hole. When attaching the injection nozzle (3) to one of the mounting screw holes (23) in the radial direction, for example, the other oblique mounting screw hole (24) is closed with the plug shaft (25). Injection nozzle
(3) communicates with the inflow hole (22), jets a mixed flow of air-polishing material supplied from the blast hose (26) in the direction of the spray nozzle, and sprays it perpendicularly to the surface to be processed. Sweep.

When peeling of the surface layer of the surface to be treated is desired, the rotary shaft (2)
180 degrees and attach the injection nozzle (3) to the screw hole (2
Change from 3) to the diagonal screw hole (24) and screw hole (23)
The plug shaft (25).

The reciprocating rocking device (4) is a rotary actuator (7) fixed on a mounting bracket (43) (trade name: Hi-Rotor, manufactured by Taiyo Kogyo Co., Ltd.), and the drive shaft (44) is a cylinder ( Two vanes (72) (73) penetrating through 71) and projecting symmetrically from the drive shaft (44) are reciprocally rotatable between partition walls (74) (75) in the cylinder. The drive shaft is located between the chambers (76) and (76a) defined by the vanes and the partition walls and between the chambers.
Through holes (78) and (79) are provided to communicate between (77) and (77a).

Control vanes alternately flow from the two ports A and B of the cylinder (71) to move the internal vanes (72) and (73) in the cylinder to rotate the drive shaft (44) at a constant speed. It is a thing. Fix the contact piece (42) at one end of the drive shaft (44) and rotate it integrally with the drive shaft, and apply it to the mounting bracket (43) at the position of the rotation end of the drive shaft (44). Have decided. While directly connecting the tip of the drive shaft (44) to the rotary shaft (2),
Two detectors, such as limit valves (46) and (47), are arranged to face each other around the cam plate (45) attached to the rotary shaft to detect the turning end of the rotary shaft (44) and control the same. The flow of air is switched alternately.

As shown in Fig. 4, the control air piping is the control air hose.
(5) is two limit valves in the manifold (50)
It is supplied to (46) (47) and the switching valve (51). The limit valves (46) (47) shown in the drawing show the piping condition when the anvil is free. Since the limit valve (47) facing the peripheral surface of the cam (45) having a short radius is in a free state, the air from the control hose (5) is stopped, and the port (51) of the switching valve (51) ( Control pressure does not act on 41).

On the other hand, the limit valve (46), which is in contact with the peripheral surface of the cam (45) with a large radius, is pushed by the cam to switch, and the control hose (5) is connected to the port (40) of the switching valve (51). Then, the conduction direction of the switching valve (51) is changed, the control hose (5) is conducted to the port A of the reciprocating rocking device (4), and the drive shaft (4) is rotated in one direction. At the rotating end of the rotary shaft (2), the limit valve that the cam (45) pushes switches, one valve (46) stops the flow of control air, opens the port (40) of the switching valve, and the other limit valve. (47) is pressed to cause control air to act on the port (41) of the switching valve (51). Due to the switching action of the switching valve (51), the control air flows into the port B of the reciprocating rocking device (4) to move the internal vane in the opposite direction and reverse the drive shaft (44).

Although it is possible to arrange various drive devices for reciprocating rotation of the drive shaft, if only the air piping and air equipment are used as in this embodiment, there is no danger of causing an electric fire during work,
It's safe.

However, the blast hose (26) is fed with pressurized air containing abrasives such as sand particles and fills the inflow hole (22) of the rotating shaft (2). The sand grains accumulate at the bottom of the inflow hole (22) to form a sand grain layer,
It exerts a cushioning effect on the inflowing sand air. The pressurized air filling the inflow hole (20) is jetted from the jet nozzle (3) into the negative pressure jet chamber (11) and jets the surface to be treated.

In the reciprocating rocking device (4), the control air alternately flows into the ports A and B to rotate the drive shaft (44) forward and backward at a constant speed.
(2) reciprocally rotates at a cycle of about 5 times per second to rock the injection nozzle (3). In the injection chamber (11), the cleaning material is sprayed on the surface to be polished within the range of the reciprocating swing of the injection nozzle, and the paint layer, chemicals, rust, dust, etc. adhering to the surface are peeled off, and the exhaust hose (19 ) Is sucked in and flows out.

The blast hose (26) twists and rotates as a unit against the reciprocating rotation of the rotary shaft (2), and the blast hose (26) and the rotary shaft
It is not necessary to provide a rotary joint such as a bride bearing for connection with (2).

Atmosphere flowing from the outside air intake and intake hole (16) is
1) Since it expands and flows in, it is possible to remove the polishing agent, dust, etc. accumulated on the side wall and the rotating shaft.

The swinging device of the injection nozzle according to the present invention swings the injection nozzle at a constant velocity, changes the direction at the swing end, and returns to a constant velocity. Uniform processing is possible over the entire width of the sweep.

The drawings and the description of the above embodiments are for explaining the present invention, and limit the invention described in the claims,
Alternatively, it does not reduce the range.

Needless to say, the configuration of each part of the present invention is not limited to the above-described embodiment, and various modifications can be made within the technical scope described in the claims.

[Brief description of drawings]

FIG. 1 is a slope view, FIG. 2 is a partially cutaway slope view, and FIG.
2 is a sectional view taken along the line III-III in FIG. 2, FIG. 4 is an air piping diagram, FIG. 5 is a sectional view of a rotary actuator, and FIG.
The figure is a front view of a conventional sandblasting machine. (1) …… Casing, (10) …… Sidewall (11) …… Injection chamber, (2) …… Rotating shaft (26) …… Blast hose, (3) …… Injection nozzle (4) …… Reciprocating rocking Moving device

Claims (1)

[Claims] 1. An injection chamber (11) in which a front surface of a machine base is opened and covered with a casing, an injection nozzle (3) is swingably arranged toward the opening, and the injection nozzle (3) is provided with: A rocking device (4) that rotates at a substantially constant speed and can switch the rotation direction at a constant angular speed.
The drive shaft (44) of is connected, and a detector for detecting the swing end of the injection nozzle (3) is provided between the injection nozzle (3) and the machine base,
The detector is linked to the rocking device (4), the rotation direction of the drive shaft (44) is alternately switched, and the rotation direction is switched at both ends of the rocking range of the injection nozzle (3) with almost no angular velocity. Nozzle oscillating device for sandblasting machines, which is operated at a constant speed.