JPH0798320B2 - Water jet injection state determination device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high pressure sprayed from a rotating or oscillating nozzle for deburring or cutting.
The present invention relates to a device that monitors the injection state of an ultra-high pressure water jet and determines the quality of the injection state.

[0002]

2. Description of the Related Art Conventionally, in an apparatus that jets a water jet to perform work, no jetting or a drop in jetting force occurs due to nozzle clogging. Therefore, it is necessary to use a pressure gauge or a flow meter. Has indirectly monitored the injection state of.

[0003]

However, this conventional method is possible in the field where the fluid pressure is low, but in the field of high pressure and ultra high pressure, the pressure provided in the middle of the flow path forming the water jet is used. Indirect monitoring with a meter has a problem that the accuracy is extremely low when the flow rate is very small. In addition, a flow meter for ultra-high pressure that can judge such a thing is not in general distribution yet,
When a large number of nozzles are monitored at the same time, it is very expensive and impractical.

The present invention has been made in order to solve the above-mentioned conventional problems, and its purpose is to improve the jetting state of a water jet jetted at a high pressure from a rotating or oscillating nozzle. An object of the present invention is to provide a water jet injection state determination device capable of accurately determining pass / fail with a simple structure even if the flow rate is small.

[0005]

In the water jet injection state determination device according to claim 1 of the present invention as a means for achieving the above object, a nozzle that rotates or swings will be described with reference to the conceptual diagram of the claims shown in FIG. It has a pressure receiving plate that periodically receives the jet of water jet by and is displaced in proportion to the jetting force each time , and detects the displacement of this pressure receiving plate.
For detecting the ejection force and the pressure receiving plate are periodically displaced.
Each time it detects the displacement, while detecting the displacement
Is a sensor 2 that outputs a detection signal when the displacement amount exceeds a predetermined amount, and a one-shot pulse output unit 3 that outputs one pulse signal for one detection signal of the sensor 2.
And the pulse signal from the one-shot pulse output unit 3
Every time it is output, it is less than the cycle of rotation or swing of the nozzle.
A large number of first reference time values are preset,
Of the clock pulse output unit 6 for outputting the clock pulse of
The pulse signal is output for clocking the clock pulse.
Start when the measured time value and the first reference time
And the first 0 pulse interval counter unit 4 that outputs a signal indicating the lack of the pulse signal when the value matches, the first
The 0 signal of 1 is frequency-multiplied by dividing the clock pulse.
With a pulse signal output from the multiplier 7 at predetermined time intervals
The first error allowance counter section 5 outputs a defective signal when the number of preset judgments is counted within the predetermined time interval .

Further, in the water jetting state determining apparatus according to claim 2, wherein, when described by the claims conceptual diagram shown in FIG. 2, the water jet injection state determination device according to claim 1, or the one-shot pulse output section 3
Each time the pulse signal is input, the second reference time value is
Set the time width value of the detection signal to the clock
The measurement signal is measured by using the clock
When the value of the time width of is longer than the second reference time value,
Every time the detection signal is output from the sensor 2, normal
Pulse width counter unit 8 for outputting a second 0 signal indicating
And where it is preset each time the second 0 signal is output.
The predetermined number of allowable errors is the one-shot pulse output unit 3
Is subtracted every time there is an output, and the subtraction result becomes negative
Second error allowance counter section 9 which outputs a defective signal when
And a configuration including.

[0007]

In the water jet injection state determination device according to the first aspect of the present invention, the presence or absence of water jet injection is determined. First, the ejection force detector directly receives the water jet and is displaced. The sensor outputs a detection signal when the ejection force detection unit is displaced, and the one-shot pulse output unit generates a pulse signal in response to the detection signal. The pulse interval counter unit is preset with a slightly larger reference time value based on the normal cycle of the water jet, and this reference time value is preset by the pulse signal and the pulse of the clock pulse output unit. The signal starts to be subtracted. When the nozzle hole of the rotary nozzle is not clogged, the water jet in the same state periodically displaces the ejection force detection unit, so the pulse interval counter unit presets the reference time value one after another. To be done.
Therefore, the count value of the pulse interval counter unit does not become 0 and the 0 signal is not output. The first error allowable power counter section is preset by the frequency multiplier with a preset number of times of judgment. On the other hand, when the 0 signal does not arrive at the number of times of judgment or more, the first error allowable counter section outputs water jet It is determined that it has been done. When the nozzle hole of the rotary nozzle is clogged, the next pulse signal is output with a delay, so the set reference time is exceeded, and the pulse interval counter section outputs a 0 signal. Then, the first error allowance counter section counts 0 signals more than the number of times of determination, and determines that the nozzle is clogged. In this case, a 0 signal that is less than the preset number counted before presetting is ignored because of mechanical instability of the device.

In the water jet injection state determination device according to the second aspect, it is determined whether or not the water jet is injected, and at the same time, the quality of the water jet pressure is determined. First, in the pulse width counter unit, the clock pulse is counted and subtracted only while the detection signal output from the sensor is being input. In this pulse width counter section, a reference time value set a little smaller beforehand based on the displacement time due to the normal pressure of the water jet is preset by the output signal of the one-shot output section. A 0 signal is output each time a long detection signal is input. In the second error allowable counter section, the allowable number of errors is set in advance and is subtracted from the allowable number of errors each time the pulse signal of the one-shot pulse output section is input. Also, each time a 0 signal is input, the allowable error count at that time is preset. When the number of pulse signal inputs exceeds the allowable number of errors, the water jet pressure is determined to be defective. In this case, similarly to the above, the 0 signal less than the allowable number of errors is ignored because of mechanical instability of the device.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 3 is an explanatory view showing the configuration of the water jet injection state determination device of the present embodiment, and FIG. 4 is a side view showing a deburring device to which the above injection force detection unit is attached. First, the configuration of the embodiment will be described. The water jet injection state determination device A of this embodiment includes an injection force detection unit 1 and a sensor 2.
A one-shot pulse output unit 3, a pulse interval counter unit 4, a first error tolerance counter unit 5, a clock pulse output unit 6, a frequency multiplier 7, a pulse width counter unit 8, and a second The error tolerant counter section 9 is the main component.

The jetting force detecting portion 1 is provided with a pair of nozzle holes 10 provided in a penetrating state in the diameter direction of the rotary nozzle 10.
The jets of water jets a and 10b are periodically received and displaced in proportion to the pressure each time, and the pressure receiving plate 11 of the water jet and the pressure receiving plate 11 are horizontally fixed at one end, and An arm 14 rotatably supported on a vertical portion of the base plate 12 at one end side thereof, and one end side slidably held by the horizontal part of the base plate 12 and the other end thereof rotated to the other end of the arm 14. A rod 16 that is rotatably supported 15; a spring 17 that urges the rod 16 in a direction to rotate the pressure receiving plate 11 downward;
And an adjusting portion 18 for finely adjusting the tip position of the one end side.

The sensor 2 emits a detection signal while detecting the displacement of the ejection force detecting portion 1. In this embodiment, a photo switch including a light emitting portion and a light receiving portion is used. The optical sensor 2 is fixed so as to be aligned with the one end side of the rod 16 which is the horizontal portion of the substrate 12.

The one-shot pulse output section 3 outputs one pulse each time one detection signal from the optical sensor 2 is input as a trigger signal.

The pulse interval counter unit 4 monitors the pulse interval of the one-shot pulse output unit 3, and the rotation or swing cycle of the nozzle 10 is preset.
(When the nozzle 10 has one hole, the rotation cycle of the nozzle 10
Or, if there are two holes in the nozzle 10 in the swing cycle, the nozzle
A reference time value (first reference time value) slightly larger than 10 rotation cycles or 1/2 of the oscillation cycle ) is set, and the one-shot pulse output is decreased with the count of the clock pulse output unit 6. The reference time setting unit 19 in which the first reference time value is preset each time the pulse signal of the unit 3 is input, and the one-shot pulse within the first reference time value from the time of presetting in the reference time setting unit 19. When there is no next pulse signal from the output unit 3 , it indicates that a pulse is missing.
And a pulse interval determination unit 20 that outputs a zero signal (first zero signal) .

The first error allowance counter section 5 judges the nozzle clogging state based on the number of the first 0 signals from the pulse interval counter section 4, and the number of judgment times set in advance is From the clock pulse output unit 6
Output from the frequency multiplier 7 which divides the clock pulse of
When the determination number setting unit 21 preset by a pulse signal at a predetermined time interval is set, and the determination number setting unit 21 counts the first 0 signal from the pulse interval determination unit 20 more than the set determination number. And a determination unit 22 that determines that the nozzle is clogged and outputs a defect signal.

The pulse width counter unit 8 monitors the width of the detection signal from the sensor 2, and uses a reference time value setting unit 23 in which a second reference time value is set in advance and inhibit control. Every time a detection signal is input, its signal width (length) is counted by the pulse signal of the clock pulse output unit 6, and when the detection signal is longer than the second reference time value , the reference time setting unit 23 is set to the second value. Reference time
And a signal width determination unit 24 that outputs a 0 signal (second 0 signal) indicating that it is normal while presetting to an intermediate value .

The second error permissible counter section 9 judges the pressure state of the nozzle based on the number of the second 0 signals from the pulse width counter section 8, and the preset error permissible number is The allowable error number setting unit 25 preset by the input of the second 0 signal
And a determination unit 26 that inputs and subtracts the pulse signal from the one-shot pulse output unit 3 and determines that the nozzle pressure is defective when the number of pulse signals exceeds the allowable number of errors and outputs a defective signal. have.

FIG. 4 shows a state in which the jet force detection unit 1 and the sensor 2 of the water jet jet state determination device are used in the deep hole deburring device B, where 30 is a motor for rotating the nozzle 10 and 31 is a rotary motor. Is a rotary joint for high pressure, and 32 is a movable table for moving the nozzle 10 forward and backward with respect to the work 33. When the movable table 32 is retracted, the nozzle hole of the nozzle 10 is arranged below the pressure receiving plate 11 of the ejection force detection unit 1. Then, the nozzle 10 is rotated at a constant speed by the motor 30 even when retracted, and continues to eject the water jet. Since the nozzle 10 is provided with two nozzle holes on the diameter, when the nozzle hole is not clogged, the water jet receives the pressure receiving plate 11 twice per rotation of the nozzle 10 with the same strength. Hit. Therefore, the pressure receiving plate 11 is flipped up twice by the pressure against the biasing force of the spring 17 and the rod 16 is displaced by a predetermined amount or more.
2 an optical axis of the sensor 2 in having been to protrude into the sensor 2 directions
Due to the interruption, the sensor 2 outputs the detection signal twice during the interruption time. The displacement amount of the rod 16 is less than a predetermined amount
Sometimes the detection signal is not output.

Next, the process of judging the quality of the water jet will be described. It should be noted that the presence / absence of water jet injection and the determination of the injection force are performed in parallel, but the determination process of the presence / absence of injection will be described. First, the detection signal (pulse) from the sensor 2
The one-shot pulse output section 3 outputs a pulse signal one by one for each output of. In the pulse interval counter unit 4, every time there is an output of the one-shot pulse output unit 3 within the reference time subtracted by the output of the clock pulse output unit 6 (that is, the water jet strikes the pressure receiving plate 11 in a normal cycle). The reference time value (first reference time value) is preset in the above, and there is no output within the first reference time (that is, the nozzle is clogged and the water jet does not hit the pressure receiving plate 11 in a normal cycle). Outputs a first 0 signal indicating that the pulse is missing . In the first error tolerance counter unit 5, the number of judgments preset for each output of the frequency multiplier 7 is subtracted by the first 0 signal of the pulse interval counter unit 4, and the number of the first 0 signals is the number of judgments. When the above is reached, a defective signal is output. The output interval (predetermined time interval) of the frequency multiplier 7 is
For example, (cycle of rotation or swing of the nozzle 10) x nozzle
No. of holes × number of determinations + α. In parallel with the pulse interval determination process, the pulse width counter unit 8 first sets a preset reference time value for pulse width measurement (second base value ).
A quasi-time value) is preset for each output of the one-shot pulse output unit 3. Further, the pulse signals of the clock pulse output unit 6 are counted only while the detection signal of the sensor 2 is present.
That is, the pulse signal from the clock pulse output section 6 causes
The value of the time width of the detection signal of the sensor 2 is detected. The counted amount of the pulse signals (the value of the detected time width) is the second
When it is longer than the width of the reference time value of (that is, the jet force of the water jet is normal), the 0 signal (second 0 signal) indicating that it is normal is output. The second error allowance counter section 9 presets a preset error allowance number for each second 0 signal of the pulse width counter section 8. Further, every time there is an output from the one-shot pulse output section 3 (that is, regardless of the strength of the jet force of the water jet), the number of outputs of the one-shot pulse output section 3 is subtracted from the allowable number of errors. When the number of times is exceeded , that is, the result of the above subtraction becomes negative.
When it does, it outputs a defective signal.

As described above, in the water jet injection state determination device A of this embodiment, the sensor 2
Outputs a detection signal by periodically receiving the impact force of the water jet of the rotating nozzle 10. Therefore, the clogging state of the nozzle 10 is ignored depending on the interval of the detection signal regardless of the mechanical instability of the device. Therefore, it is possible to accurately monitor without being affected by disturbance, and to quickly detect and determine clogging.

Further, since the sensor 2 outputs the impact force of the water jet as a detection signal of a temporal length and compares this with the temporal length of a normal water jet, the strength and weakness of the water jet can be promptly and accurately detected. It can be detected and determined.

The embodiments of the present invention have been described above.
The specific configuration of the present invention is not limited to this embodiment, and the present invention includes a design change and the like within a range not departing from the gist of the invention.

For example, although the embodiment has been described by determining the ejection state of the rotary nozzle, the determination can be made in the same manner even for a swinging nozzle.

The structure of the ejection force detector 1 is arbitrary, and in short, the ejection force detector 1 may be displaced each time the impact force of the water jet is received, and the displacement amount may be proportional to the magnitude of the impact force.

Although the sensor 2 has been described as a photo switch,
The type of sensor is arbitrary, and a proximity switch, an analog displacement sensor or the like can also be used.

[0025]

As described above, the present invention claims 1.
In the described water jet injection state determination device,
The jet force detector that displaces each time the water jet is operated activates the sensor and sets the allowable number of detections. Can be ignored and can be accurately monitored without being affected by disturbance, and clogging can be detected and determined quickly.

Further, in the water jet injection state determination device according to the present invention, in addition to the above effect, the impact force of the water jet is set as a temporal length to activate the sensor and set the allowable number of detections. As a result, the strength of the water jet can be monitored without being affected by disturbance by ignoring the signal due to mechanical instability of the device, and the strength of the jet force of the water jet can be detected quickly. The effect of being able to make a determination is obtained.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a claim showing a water jet injection state determination device according to a first aspect of the invention.

FIG. 2 is a conceptual diagram of a claim showing a water jet injection state determination device according to a second aspect of the invention.

FIG. 3 is an explanatory diagram showing a configuration of a water jet injection state determination device according to an embodiment.

FIG. 4 is a side view showing a deburring device to which the injection detection unit of the embodiment is attached.

[Description of Codes] A water jet injection state determination device 1 injection force detection unit 2 sensor 3 one-shot pulse output unit 4 pulse interval counter unit 5 first error allowance counter unit 6 clock pulse output unit 7 frequency multiplier 8 pulse width Counter section 9 second error tolerance counter section 10 nozzle 11 pressure receiving plate (injection force detection section) 14 arm (ejection force detection section) 16 rod (ejection force detection section) 17 spring (ejection force detection section)

Claims (2)

[Claims] [Claim 1] The injection of the water jet by the nozzle rotating or oscillating periodically receiving a pressure receiving plate which is displaced in proportion to each time the injection force, detecting the displacement of the pressure receiving plate
And an ejection force detection unit for detecting the displacement every time the pressure receiving plate is periodically displaced,
While the displacement is being detected, the displacement amount is equal to or more than a predetermined amount.
A sensor for emitting a detection signal when it, one of the one-shot pulse output unit that outputs one pulse signal to the detection signal, the pulse signal from the one-shot pulse output unit is an output of the sensor
A little more than the rotation or rocking cycle of the nozzle
The first reference time value of
Clock of the clock pulse output section that outputs a clock pulse
When the pulse signal is output, the timing by pulse is
When the time is started, the measured time value and the first reference time value are
And a pulse interval counter section that outputs a first 0 signal indicating that the pulse signal is missing, and a frequency that divides the first 0 signal by the clock pulse.
The pulse signal output from the wave multiplier at the specified time intervals
The predetermined time interval more than the preset number of judgments
Water jet injection state determination apparatus characterized by comprising a first error tolerance counter unit for outputting a defect signal when the count within. 2. The power from the one-shot pulse output section
Second reference time value is preset each time a loose signal is input
The time width value of the detection signal to the clock pulse.
The time of the detected signal is measured by
When the width value is longer than the second reference time value, the detection
Each time an intelligent signal is output from the sensor,
A pulse width counter unit which outputs a second 0 signal, the predetermined which is preset each time the output of the second zero signal
The allowable number of errors is the output of the one-shot pulse output section
2. The water jet injection state determination device according to claim 1, further comprising: a second error tolerance counter unit that outputs a defect signal when the subtraction result becomes negative each time .