JPH052320Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a water jet cutting device.

(Prior Art) Conventionally, as a water jet cutting nozzle used in a water jet cutting device,
Abrasive cutting nozzles and pure water cutting nozzles are known. Although the configuration of each nozzle is shown in FIGS. 5 and 6, each nozzle will first be briefly explained based on the figures.

An abrasive cutting nozzle is a nozzle that performs cutting using high-pressure water mixed with suspended abrasive liquid as an abrasive, for example, a suspension abrasive liquid containing 20 to 70% alumina-based fine abrasive particles with an average particle size of 100 μm or less. And,
As shown in FIG. 5, an abrasive nozzle tip 10 is attached by a nozzle holder 3 to an adapter 1 having a high-pressure water passage 2 bored at its axial position. This abrasive nozzle chip 10 has abrasive mixing chambers 6 arranged at the axial center of the chip body 4 in order from the base end to the distal end.
and an abrasive accelerating section 7 are formed, and the abrasive mixing chamber 6 communicates with the high pressure water passage 2 via a high pressure water nozzle tip 8, and an abrasive introduction passage formed in the nozzle holder 3 (Fig. (not shown) via the abrasive supply channel 11, and a suspension supplied via the abrasive supply channel 11 to the high pressure jet water stream supplied into the abrasive mixing chamber 6 via the high pressure water nozzle tip 8. This involves mixing in a cloudy liquid. This liquid mixture is then accelerated and ejected by the abrasive accelerator 7.

On the other hand, the pure water cutting nozzle is replaceably attached to the adapter 1 when cutting is performed using only water, and as shown in FIG. 6, is configured to use only a high-pressure water nozzle tip 30.

Each water jet cutting nozzle described above is connected to a high-pressure water supply source via an on-off valve, and is installed in a factory as a cutting machine and used for cutting various parts, or as a portable cutting tool, for example, in a building. It is sometimes used to cut reinforced concrete at demolition sites.

(Problems to be Solved by the Invention) However, in the cutting machines or cutting tools equipped with the above-mentioned water jet cutting nozzles, the material to be cut is not located at the tip of the nozzle after the cutting of the material is finished. After the water has cooled down, the worker must perform an operation to stop the high-pressure water jetting.
When cutting is performed using a plurality of devices at the same time, the operation to stop them becomes troublesome.

This invention was made in order to solve the above-mentioned conventional problems, and its purpose is to automatically cut the material with high-pressure water when the material to be cut is no longer located at the tip of the water jet cutting nozzle. It is an object of the present invention to provide a water jet cutting device capable of stopping the supply, thereby reducing the number of steps required for operation.

(Means for Solving the Problems) Therefore, the waterjet cutting device of this invention is a waterjet cutting device comprising a waterjet cutting nozzle connected to a high-pressure water supply source, and in which the waterjet cutting device connects a waterjet cutting nozzle to a high-pressure water supply source. a switching means for switching between supplying and stopping high-pressure water; a detecting means for detecting whether or not the nozzle is located within a predetermined distance from the material to be cut; and control means for switching the switching means to the supply side only when it is detected that the cutter is located within a predetermined distance from the material to be cut.

(Function) In the water jet cutting device having the above configuration, the control means switches the switching means to the supply side only when the detection means detects that the nozzle is located within a predetermined distance from the material to be cut. Therefore, when the material to be cut is no longer located on the nozzle tip side, the switching means is automatically switched to stop the supply of high-pressure water.

(Example) Next, a specific example of the water jet cutting device of this invention will be described in detail with reference to the drawings. In the following embodiments, when the same nozzles as those described in the above-mentioned conventional example are used as the water jet cutting nozzles, the same reference numerals will be used for the same parts, and the explanation thereof will be omitted.

FIG. 1 shows a first embodiment in which an abrasive cutting nozzle 21 is employed as the waterjet cutting nozzle. As shown in the figure, the proximal end side of the abrasive cutting nozzle 21 or an on-off valve 26 is connected, and by opening and closing this on-off valve 26, a high pressure water supply source (not shown) is connected to the hose 2.
The high pressure water supplied to the abrasive cutting nozzle 21 via the abrasive cutting nozzle 21 is supplied and stopped. As this on-off valve 26, a valve having a structure that is operated by controlling, for example, oil pressure, air pressure, etc. is used. On the other hand, a detection sensor 23 is attached to the tip end surface of the nozzle holder 3 of the abrasive cutting nozzle 21. This detection sensor 23 is a contact type on/off type sensor, and the sensor body 24
and a probe 25 attached to the sensor body 24 so as to be able to reciprocate in the axial direction, and as shown in the figure, the tip of the probe 25 is further distal than the tip of the abrasive nozzle tip 10 It is designed to reciprocate in the position of . The detection sensor 23 is
The tip of the abrasive cutting nozzle 21 is brought close to the material to be cut, and when the tip of the feeler 25 touches the material and moves toward the proximal end by a predetermined distance, an on signal is output. When the tip of the tip 25 is not in contact with the material to be cut, it is pressed toward the tip by the biasing means and is in the OFF state. The position of the tip of the contactor 25 when the ON signal is output is appropriately determined in consideration of the position where the material to be cut is suitably cut by the high-pressure water from the abrasive nozzle tip 10. Although not shown, this water jet cutting device has a control section.
This control section operates the opening/closing valve 26 in response to the ON signal from the detection sensor 23 and holds it in that state, while the detection sensor 23
This is for controlling the hydraulic pressure, air pressure, etc. for the on-off valve 26 so that the on-off valve 26 is maintained in the closed state when the on-off valve is in the off state.

In the waterjet cutting device with the above configuration, while cutting the material to be cut, the detection sensor 23 outputs an ON signal when the contactor 25 comes into contact with it, and based on this, the hydraulic pressure, air pressure, etc. are controlled. The on-off valve 26 is held in the open position and high-pressure water is spouted out, but after the cutting of the material to be cut is completed and the material to be cut is no longer located on the tip side of the abrasive cutting nozzle 21. At the same time, the probe 25 protrudes toward the tip side, and the detection sensor 23 is turned off, which in turn closes the on-off valve 26.
This will stop the high-pressure water spout. In this way, in the above embodiment, when cutting is completed and the material to be cut is no longer located on the tip side of the abrasive cutting nozzle 21, the jetting of high-pressure water is automatically stopped. It is possible to reduce the number of steps required for the ejection stop operation. In addition, when the above-mentioned cutting device is made portable and used at a building demolition site, even if the tip of the nozzle 21 accidentally points in the direction of a person, the high-pressure water jetting will automatically stop. Therefore, it is also superior in terms of safety.

FIG. 2 shows a second embodiment. This embodiment is different from the first embodiment in that a pure water cutting nozzle 41 is used as the water jet cutting nozzle, but other parts are different from the first embodiment. Since they are almost the same, similar symbols are used for similar parts.
The explanation will be omitted. In this embodiment as well, it is possible to achieve the same effects as in the first embodiment.

FIG. 3 shows a third embodiment. In this embodiment, a photoelectric sensor 44, which is a non-contact type sensor, is used as the detection means. That is, by receiving the reflected light from the material to be cut 45 of the projected light, it is detected whether the tip of the pure water cutting nozzle 41 is located within a predetermined distance from the material to be cut 45. However, it outputs a detection signal similar to the on signal in the first embodiment. Since the other parts are substantially the same as those in the second embodiment, the same reference numerals will be used for the same parts and the explanation thereof will be omitted. Further, FIG. 4 shows a fourth embodiment, which is an example of application to a pure water cutting device using a high-pressure water nozzle chip 8 and a photoelectric sensor 44. In each of the embodiments described above, it is possible to achieve substantially the same effects as those described above.

The embodiments of this invention have been explained above, but
The detection means in this invention includes those according to the above embodiments, as well as contact type sensors, such as those using a limit switch that operates within a certain distance after contact, and those using a touch sensor that operates simultaneously with contact. In addition, as non-contact sensors, there are those that use a photoelectric proximity switch that uses reflected light, those that use a laser proximity switch that uses laser light, and the eddy current proximity switch that uses a magnetic field generated by eddy current. Examples include those using a pressure-type proximity switch that blows compressed air and detects the pressure with a pressure sensor.

(Effect of the invention) As described above, in the waterjet cutting device of this invention, the control means operates the switching means only when the detection means detects that the nozzle is located within a predetermined distance from the material to be cut. Since the control is switched to the high-pressure water supply side, when cutting is completed and the material to be cut is no longer located on the tip side of the water jet cutting nozzle, the high-pressure water jetting automatically stops, and the high-pressure It is possible to reduce the number of steps required to stop water spouting. In addition, when this device is configured to be portable and used at a building demolition site, even if the tip of the nozzle is erroneously oriented in the direction of a person, the high-pressure water jetting will automatically stop. Therefore, it is also superior in terms of safety.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view showing the first embodiment of the water jet cutting device of this invention, and Fig. 2 is the second embodiment thereof.
FIG. 3 is a longitudinal sectional view showing the third embodiment, FIG. 4 is a longitudinal sectional view showing the fourth embodiment, and FIGS. 5 and 6 are for abrasive cutting. FIG. 3 is a partial vertical cross-sectional view showing a nozzle and a pure water cutting nozzle. 21... Abrasive cutting nozzle (water jet cutting nozzle), 23... Detection sensor (detection means), 26... Opening/closing valve (switching means), 41
... Pure water cutting nozzle (water jet cutting nozzle), 44 ... Photoelectric sensor (detection means), 45
...Material to be cut.

Claims (1)

[Scope of utility model registration request] A water jet cutting device comprising a water jet cutting nozzle connected to a high pressure water supply source, a switching means for switching between supplying and stopping high pressure water from the high pressure water supply source to the nozzle;
a detection means for detecting whether the nozzle is located within a predetermined distance from the material to be cut;
A water jet characterized by comprising a control means for switching the switching means to the supply side only when the detection means detects that the nozzle is located within a predetermined distance from the material to be cut. Cutting device.