JPH10156723A - Machining device using high pressure water jet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably display specified machining ability by adjusting jet and stop timing of high pressure water jet and supply and stop timing of abrasive in a device for jetting high pressure water jet mixed with abrasive or the like to perform cleaning, cutting, and the like of a workpiece. SOLUTION: Water in a tank 3 is led to a high pressure water pump 2, pressurized and jetted from the nozzle tip of a water jet gun 1 via a high pressure water cutoff valve 4. Abrasive is led to a nozzle part from a hopper 9 through a cutoff valve 11 and sucked into jet flow, and high pressure water jet mixed with the abrasive is jetted to a workpiece. In this case, time when the pressure of the high pressure water of the pump 2 becomes the specified pressure is set by a timer, and after the lapse of the specified time, the cutoff valve 11 is opened to feed the abrasive to the nozzle part. At the time of stopping jet, a trigger 1a is opened, and a switch 1b is turned off to close the cutoff valve 11, thus stopping the supply of the abrasive. After the lapse of set time, the cutoff valve 4 is closed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing apparatus utilizing a high-pressure water jet for injecting a high-pressure water jet onto a workpiece and performing processing such as surface cleaning, surface roughness adjustment and cutting of the workpiece. .

[0002]

2. Description of the Related Art FIG. 2 is a view showing an example of the configuration of a processing apparatus utilizing a high-pressure water jet of this type, and FIG. 3 is a view showing a schematic sectional structure of a water jet gun which jets a high-pressure water jet. In FIG. 2, reference numeral 101 denotes a water jet gun for jetting a high-pressure water jet. The water jet gun 101 sends high-pressure water from the high-pressure water pump 102 through a built-in high-pressure water shut-off valve 104 to the water jet gun 101.
A high-pressure water jet is jetted from the tip of the nozzle 103 of No. 01. The abrasive or the abrasive is supplied from the hopper 105 to the nozzle 1 of the water jet gun 101 by the transport hose 106.
03 and mixed into a high pressure water jet stream in a manner to be described in greater detail below.

As shown in FIG. 3, the cross-sectional structure of the mixing portion for mixing the abrasive or the abrasive of the nozzle 103 into the high-pressure water jet stream (the cross-sectional structure of the main part of the water jet gun (A portion in FIG. 2)) is shown in FIG. A main body 31;
Is connected to a nozzle 32 for jetting a high-pressure water jet, a mixing chamber 33 is provided at the center, and a high-pressure water inlet 34 and an abrasive or abrasive inlet 35 are provided. Also, mixing chamber 3
An orifice 36 for passing a high-pressure water flow is provided at the inlet of the nozzle 3.

A method of mixing an abrasive or an abrasive into a high-pressure water jet stream is performed as follows. When the high-pressure water flow generated by the high-pressure water pump 102 is guided to the high-pressure water inlet 34 of the nozzle 103 through the high-pressure water shut-off valve 104, the high-pressure water flow passes through the orifice 36, and a high-pressure water jet flows in the mixing chamber 33. I do. The generation of the high-pressure water jet stream causes a negative pressure around it due to the ejector effect, so that the abrasive or abrasive is sucked into the high-pressure water jet from the abrasive or abrasive inlet 35 and mixed. Then, the high-pressure water jet stream in which the abrasive or the abrasive is mixed passes through the nozzle part 32 and is jetted from the tip as a high-pressure water jet to the workpiece to perform processing such as surface cleaning, surface roughness adjustment and cutting. .

[0005]

In the above-mentioned conventional apparatus for utilizing a high-pressure water jet, the hopper 105 containing the abrasive or the abrasive is not provided with a valve for automatically shutting off or discharging the abrasive or the abrasive. The high pressure water shutoff valve 104, which opens and closes in conjunction with the trigger 101a of the water jet gun 101, opens and closes the high pressure water jet flow generated through the orifice 36, thereby causing the ejector effect to be generated and stopped. Release of abrasives
Stopping. Therefore, when the high-pressure water shut-off valve 104 is closed and the high-pressure water jet flow is stopped, the abrasive or the abrasive is transported into the transport hose 106 and the mixing chamber 3.
3 stays inside.

The high-pressure water is shut off by the high-pressure water shut-off valve 104, but before and after the orifice 36 (upstream and downstream), a small amount of water having a reduced pressure remains. Abrasive or abrasive remaining on the surface is wet or wet. Furthermore, high pressure water pump 1
02 is started, the pressure is changed from a low pressure state to a high-pressure water injection state. Therefore, the ejector effect is low, and the abrasive or the abrasive remaining in the mixing chamber 33 is weakly discharged. Alternatively, the abrasive may be wet or wet.

Abrasives or abrasives cannot be transported unless used in a dry state. That is, the abrasive or abrasive is 50 to 3
Since it is made of powdery garnet, quartz sand or the like having a particle size of 00 mesh, it tends to solidify when it contains moisture. Therefore, as described above, when the abrasive or the abrasive is wetted or wet by water, the abrasive or the abrasive is solidified in the mixing chamber 33 or the transport hose 106, and even if the ejector effect due to the high-pressure water jet flows, the abrasive Alternatively, there arises a problem that the abrasive cannot be sufficiently sucked and mixed into the high-pressure water jet stream, and there is a drawback that a predetermined processing ability by the high-pressure water jet stream cannot be obtained.

[0008] The present invention has been made in view of the above-mentioned point, and a sufficient amount of abrasives or abrasives is always supplied to a high-pressure water jet stream without remaining abrasives or abrasives in a mixing chamber or a transport hose. It is an object of the present invention to provide a high-pressure water jet-based processing apparatus which can be mixed and can obtain a predetermined processing capability by a high-pressure water jet.

According to a first aspect of the present invention, there is provided a high-pressure water jet stream generating means for injecting high-pressure water to generate a high-pressure water jet stream, and supplying the high-pressure water jet stream to the high-pressure water jet stream generating means. The abrasive or the abrasive to be mixed is sucked and mixed into the high-pressure water jet by the ejector effect of the high-pressure water jet, and the high-pressure water jet mixed with the abrasive or the abrasive is jetted onto the workpiece as a high-pressure water jet. In a high-pressure water jet utilizing processing apparatus for performing processing such as surface cleaning, surface roughness adjustment, and cutting of the workpiece, the injection and stop timing of the high-pressure water jet flow and the supply and stop timing of the abrasive or abrasive are controlled. It is characterized in that timing adjusting means for adjusting is provided.

[0010] The invention described in claim 2 is the same as the claim 1.
In the high pressure water jet utilizing processing apparatus described in the above, the timing adjusting means, when ejecting the high pressure water jet flow, supply abrasive or abrasive after a predetermined time has elapsed after injecting the high pressure water jet flow, the high pressure water jet flow At the time of stopping, the high-pressure water jet flow is configured to be stopped after a lapse of a predetermined time from stopping the abrasive or the abrasive.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration example of a high-pressure water jet processing apparatus according to the present invention. Reference numeral 1 denotes a water jet gun for jetting a high-pressure water jet. The main structure of the water jet gun 1 is substantially the same as that shown in FIG. 2 is a high-pressure water pump that generates high-pressure water, 3 is a tank that contains water, 4 is a high-pressure water cutoff valve that opens and closes a high-pressure water flow path, 5 is a motor that drives the high-pressure pump, 6 is a pressure gauge,
7 is a drain valve. Reference numeral 13 denotes a water supply pipe for supplying water into the tank, and reference numeral 14 denotes a float valve for maintaining a constant water level in the tank.

When the motor 5 is started to drive the high-pressure water pump 2, the water in the tank 3 is guided to the high-pressure water pump 2 through the filter 8, where it is pressurized to about 170 kg / cm ^2.
Of high pressure water. The high-pressure water passes through a high-pressure water shut-off valve 4,
It is guided to the water jet gun 1 and a high-pressure water jet is jetted from the nozzle tip.

On the other hand, abrasive or abrasive material is supplied from a discharge port of the hopper 9 through a throttle valve 10, a shutoff valve 11 and a transport hose 12.
Through the orifice 36, as shown in FIG. 3, by the ejector effect of the high-pressure water jet generated in the mixing chamber 33. The abrasive or abrasive is sucked into and mixed with the high-pressure water jet stream, and a high-pressure water jet mixed with abrasive or abrasive is jetted from the nozzle tip of the water jet gun 1 toward the workpiece.

A high-pressure water shut-off valve 4 for opening and closing high-pressure water from the high-pressure water pump 2 is a trigger 1a of the water jet gun 1.
The switch 1b is opened and closed by turning on and off the switch 1b in conjunction with the switch. Now, when the high pressure water jet is injected, when the switch 1b is turned on, the motor 5 is started by this signal, the high pressure water pump 2 is driven, and the high pressure water cutoff valve 4 is opened at the same time when high pressure water is generated. As a result,
The high-pressure water that has passed through the orifice 36 of the water jet gun 1 forms a high-pressure water jet flow in the mixing chamber 33, thereby forming the mixing chamber 33.
The inside becomes negative pressure due to the ejector effect.

When the time when the high-pressure water of the high-pressure water pump 2 reaches a predetermined pressure is set by a timer, and after the predetermined time has elapsed, the shut-off valve 11 is opened. Is supplied to the nozzle portion of the water jet gun 1 and mixes with the high-pressure water jet stream in the mixing chamber 33, and the high-pressure water jet containing the abrasive or the abrasive is injected toward the workpiece from the nozzle tip.

To stop the injection, the trigger 1a is opened and the switch 1b is turned off. OF of the switch 1b
By F, the shutoff valve 11 is first closed, and the supply of the abrasive or the abrasive is stopped. As a result, the abrasive or abrasive remaining in the transport hose 12 and the mixing chamber 33 is discharged. The time required for discharging the residual abrasive or abrasive is set by a timer, and when the set time is reached, the high-pressure water shut-off valve 4 is closed, and the high-pressure water jet from the nozzle tip of the water jet gun 1 stops.

Next, when the high-pressure water shut-off valve 4 is closed, the flow of the high-pressure water is stopped between the high-pressure water pump 2 and the high-pressure water shut-off valve 4, so that the water pressure is set to the set pressure of the pressure regulating valve (relief valve) 15. Rise up to At this time, the water discharged by the high-pressure water pump 2 returns to the tank 3 through the throttle valve 18 as surplus water of the pressure regulating valve 15. If you are using a high pressure water jet,
This spillage does not flow, or the pressure is not generated because it is a very small amount. However, when the spillage flows as a whole, pressure is generated in the pipeline between the pressure regulating valve 15 and the throttle valve 18. After this increased pressure is detected by the pressure switch 16, the predetermined time t ₃ when set in the timer has elapsed,
The motor 5 is stopped.

FIG. 4 is a timing chart showing the operation timing of each section of the high-pressure water jet processing apparatus. In FIG. 4, the pressure gauge 17 is a pressure gauge for detecting a water pressure in a pipe between the water jet gun 1 and the high-pressure water shutoff valve 4, and is not provided in an actual device. The power switch and the operation switch are not shown in FIG. As shown in the drawing, the operation switch is turned on after an arbitrary time has elapsed since the power switch was turned on.

After an arbitrary time has elapsed since the operation switch was turned on, the switch 1b of the water jet gun 1 was turned on.
Thereby, the motor 5 is started, the high-pressure water pump 2 is driven, and the high-pressure water cutoff valve 4 is turned on (open).
When the high-pressure water pump 2 is driven, a predetermined time t ₁ set by a timer elapses (the predetermined time t ₁ is a water pressure between the water jet gun 1 and the high-pressure water pump 2 measured by the pressure gauges 6 and 17). Is set to a time at which a predetermined value is reached), and then the shutoff valve 11 is turned on (opened). As a result, the abrasive or abrasive is supplied from the hopper 9 and mixed with the high-pressure water jet in the mixing chamber 33 of the water jet gun 1 as described above. It is injected.

When the high-pressure water jet is stopped, by turning off the switch 1b of the water jet gun 1, the shut-off valve 11 is immediately turned off (closed), and the supply of the abrasive or the abrasive is stopped. The predetermined time t ₂ has elapsed set by the timer from (the predetermined time t ₂ is abrasive or abrasive remaining in the transport hose 12 and the mixing chamber 33 is set to a time to be discharged), and The high-pressure water cutoff valve 4 is turned off (closed). As a result, the water pressure between the water jet gun 1 and the high-pressure water shutoff valve 4 measured by the pressure gauge 17 decreases, and the water pressure between the high pressure water shutoff valve 4 and the high pressure water pump 2 measured by the pressure gauge 6 increases. and, when the pressure of the pressure regulating valve 15 and the throttle valve 18 becomes a pressure value PS ₁ set by the pressure switch 16 stops the motor 5 When next the pressure switch 16 is oN, the predetermined time t ₃ when set in the timer has elapsed The high-pressure water pump 2 is stopped.

After continuation of the above-mentioned operation, after performing the processing such as surface cleaning, surface roughness adjustment and cutting of the workpiece by high-pressure water jet jetting mixed with abrasive or abrasive, these operations are terminated. By turning off the operation switch and then turning on the trigger 1a of the water jet gun 1 for a predetermined time, the residual pressure of the high-pressure water remaining in the pipe is released. That is, when the trigger 1a is turned on, the switch 1b is turned on, the high-pressure water shutoff valve 4 is turned on (open), and the high-pressure water remaining inside the pipe is discharged. When the discharge of the high-pressure water is completed, the trigger 1a is turned off.
F, the switch 1b is turned off, and finally the power switch is turned off.

As described above, the injection and stop of the high-pressure water jet and the supply and stop of the abrasive or abrasive are operated with a time difference (when the high-pressure water jet is injected, a predetermined time has elapsed after the injection of the high-pressure water jet). When the high-pressure water jet is stopped, the high-pressure water jet is supplied, and when the high-pressure water jet is stopped, the high-pressure water jet is stopped when the high-pressure water jet is stopped. By detecting the pressure in the path and stopping the motor 5 and the high-pressure pump 2, the abrasive or the abrasive is prevented from being hardened by wetness or wetness as in the conventional example, and a sufficient amount is always supplied to the high-pressure water jet stream. Abrasive or abrasive can be mixed, and a predetermined processing ability by high-pressure water jet flow can be obtained. It also reduces energy consumption and water consumption.

The high pressure water jet processing apparatus of the present invention is not limited to the configuration shown in FIG.
In short, the present invention can naturally be applied to any configuration in which the supplied abrasive or abrasive is suction-mixed into the high-pressure water jet stream by the ejector effect of the high-pressure water jet stream.

[0024]

As described above, according to the first and second aspects of the present invention, the timing adjustment for adjusting the injection and stop timings of the high-pressure water jet flow and the supply and stop timings of the abrasive or the abrasive material. Since the means is provided, it is possible to prevent the abrasive or abrasive material from hardening due to wetness or wetness, to always mix a sufficient amount of abrasive or abrasive material in the high-pressure water jet flow, and to achieve a predetermined processing capability by the high-pressure water jet flow. An excellent effect that an obtained high-pressure water jet utilizing processing apparatus can be provided is obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration example of a high-pressure water jet utilizing processing apparatus of the present invention.

FIG. 2 is a diagram showing a configuration example of a conventional high-pressure water jet utilizing processing apparatus.

FIG. 3 is a diagram showing a cross-sectional structure of a main part of the water jet gun.

FIG. 4 is a timing chart showing operation timings of various parts of the high-pressure water jet processing apparatus shown in FIG. 1;

[Description of sign]

 DESCRIPTION OF SYMBOLS 1 Water jet gun 2 High pressure water pump 3 Tank 4 High pressure water shutoff valve 5 Motor 6 Pressure gauge 7 Drain valve 8 Filter 9 Hopper 10 Throttle valve 11 Shutoff valve 12 Transport hose 13 Water supply pipe 14 Float valve 15 Pressure control valve 16 Pressure switch 17 Pressure gauge 31 Mixing part main body 32 Nozzle part 33 Mixing chamber 34 High-pressure water inlet 35 Abrasive or abrasive inlet 36 Orifice

Claims (2)

[Claims] 1. A high-pressure water jet generating means for injecting high-pressure water to generate a high-pressure water jet flow, wherein the abrasive or abrasive supplied to the high-pressure water jet flow is supplied to the high-pressure water jet flow. The high-pressure water jet stream is sucked into the high-pressure water jet stream by the ejector effect, and the high-pressure water jet stream containing the abrasive or the abrasive is jetted onto the workpiece as a high-pressure water jet, and the surface cleaning and surface roughness of the workpiece are performed. In a high pressure water jet utilizing processing apparatus for performing processing such as adjustment and cutting, timing adjustment means for adjusting injection and stop timing of the high pressure water jet flow and supply and stop timing of the abrasive or abrasive material is provided. High pressure water jet utilizing processing equipment. 2. The method according to claim 1, wherein the timing adjusting means supplies the abrasive or the abrasive after a lapse of a predetermined time from injecting the high-pressure water jet stream when the high-pressure water jet stream is injected. 2. The high-pressure water jet utilizing processing apparatus according to claim 1, wherein the high-pressure water jet flow is stopped after a predetermined time has elapsed after stopping the material or the abrasive.