JP2013129042A - Jet catcher and jet processing machine with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jet catcher which enables an appropriate replacement time point of its bottom member to be easily determined before the bottom member is pierced and can be economically and safely used over a longer term than ever before.SOLUTION: In the jet catcher, an approximately cylindrical member coaxially equipped with an inside space whose one end acts as an opening includes a bottom surface which closes the inside space at the other end opposed to the opening to receive a jet introduced from the opening into the inside space, and a vent for discharging the jet after colliding against the bottom surface from the inside space to the outside. The cylindrical member further includes a portion with a predetermined thickness at a bottom ranging from the bottom surface to a rear end of the cylindrical member, and at its bottom a jet detection path bored along a direction intersecting with the central axis of the cylindrical member at a predetermined position in the vicinity of the rear end, at least one end of which has an opening opened to the outside of the cylindrical member.

Description

  The present invention relates to a jet catcher for receiving a jet penetrating a workpiece during a processing operation using a water jet or an abrasive water jet, and a jet processing machine including the jet catcher.

  Currently, when processing a three-dimensional workpiece with an ultra-high-pressure abrasive jet, the reaction force when the abrasive jet is injected and stopped is large, and the destructive force of the jet itself is large. The processing machine 10 combined with is adopted. Such an abrasive water jet processing machine includes a nozzle device 13 that injects an abrasive water jet at the tip 11 of the robot arm, and controls the position of the nozzle device 13 with respect to the workpiece W by driving control of the robot arm. Can do.

  In addition, the nozzle device mixes ultra-high pressure water sprayed from the water nozzle in the abrasive head and abrasive (Abrasive), and sprays it from the abrasive nozzle at the tip as an abrasive water jet. The valve controls the injection (on) / stop (off) of ultra-high pressure water from the water nozzle, that is, the injection / stop of the abrasive water jet.

  In such an abrasive water jet processing machine, a buffer arm for a jet penetrating the workpiece W, a jet cup for receiving the jet, and a jet catcher 20 are arranged at a position opposed to the nozzle device 13 by a jig 12 at a fixed interval. By being fixed to the tip 11 and moving synchronously with the nozzle device 13, the jet injected at all times after the workpiece W has penetrated the jet or other than during processing is received (see, for example, Patent Documents 1 and 2). .

  The jet catcher is composed of a substantially cylindrical member, the member is fixed coaxially with the abrasive nozzle, receives the jet penetrating the workpiece, and the jet collides with the bottom of the member itself. Those that attenuate the momentum are common. The abrasive liquid after the collision is discharged to the outside through the discharge port.

JP-A-4-244399 Utility Model Registration No. 2601530 JP 2011-84138 A

  The jet catcher as described above is usually made of cemented carbide, but the bottom surface where the jet introduced from the opening collides continues to receive the fluid energy of the jet including abrasive as a mechanical impact force. The catcher will be damaged over time. The bottom portion of the catcher has a certain thickness of the member, but the damaged portion may be perforated and eventually penetrate the bottom member. However, since it is not known when the abrasive jet penetrates the bottom member, there is a risk that the jet after penetrating hits a nearby person to cause harm.

  In order to prevent this, the bottom member or the catcher itself has to be replaced early before the perforation proceeds to the rear end side of the bottom member, even though there is actually enough time remaining. For this reason, the conventional jet catcher has a high replacement frequency of members and the like, and the waste of the members is unavoidable, resulting in high costs.

  In view of the above problems, an object of the present invention is to provide an abrasive jet catcher that can easily determine a suitable replacement time before the bottom member of the jet catcher penetrates and that can be used safely without waste over a longer period of time. There is to do.

In order to achieve the above object, a jet catcher according to claim 1 is a jet catcher for receiving a jet ejected from a nozzle device.
It consists of a substantially cylindrical member provided coaxially with an internal space where one end side is an opening,
The cylindrical member closes the internal space at the other end facing the opening and receives a jet introduced into the internal space from the opening, and the jet after colliding with the bottom surface from the internal space to the outside. And having a predetermined thickness on the bottom portion extending from the bottom surface to the rear end of the cylindrical member,
The bottom portion is perforated at a predetermined position near the rear end of the cylindrical member along a direction intersecting the central axis of the cylindrical member, and at least one end thereof is outside the cylindrical member. A jet detection passage having an opening to be opened is provided.

The jet catcher according to a second aspect of the present invention is the jet catcher according to the first aspect, wherein the cylindrical member includes a substantially cylindrical main body member whose both ends are open, and a second end portion of the main body member. A bottom member that is mounted and forms an internal space with the opening on one end side and receives a jet introduced into the internal space from the opening; and
The main body member has a discharge port for discharging the jet after colliding with the bottom member from the internal space to the outside,
The bottom member is formed at a predetermined position near a rear end portion thereof along a direction intersecting with the central axis of the main body member, and has an opening at least one end of which is opened to the outside of the cylindrical member. It has a jet detection passage.

A jet catcher according to a third aspect of the present invention is the jet catcher according to the first or second aspect, wherein the tubular member is mounted on one end of the main body member and receives the jet from an outer opening. An introduction side member provided coaxially with the main body member for a through path for introduction into the internal space of the member;
The through-passage of the introduction side member has a tapered region in which the diameter of the outer opening is larger than the diameter of the inner opening exposed to the inner space, and the diameter is continuously reduced from the outer opening toward the inside of the main body member. is there.

  A jet catcher according to a fourth aspect of the present invention is the jet catcher according to any one of the first to third aspects, further comprising a sensor device that detects a mist jet discharged from the opening of the detection passage. It is characterized by having.

  A processing machine according to a fifth aspect of the present invention is the processing machine according to any one of the first to fourth aspects, wherein the jet catcher according to any one of the first to fourth aspects opposes a nozzle for injecting a processing jet and extends the central axis of the nozzle. The internal space is positioned above and is provided at predetermined intervals from the nozzle.

  In the jet catcher of the present invention, at least one end is opened to the outside along the direction intersecting the central axis of the cylindrical member that coincides with the jet axis of the jet at a predetermined position near the rear end of the bottom member. By providing a jet detection passage having an opening formed therein, the jet first reaches the detection passage and passes through the passage in the form of a mist, even if the perforation generated at the bottom continues to receive the jet penetrating the workpiece. Since the jet is discharged to the outside from the opening of the passage, the injection of the abrasive water jet from the nozzle can be stopped at the time when the discharge is confirmed, and the drilling is further performed from that point to the rear end of the bottom member. A person in the vicinity can be retreated during the period until it completely passes through the bottom.

  Therefore, the distance in the central axis direction from the rear end of the bottom member to the detection passage corresponds to a stop margin or a retreat margin, and the member can be used sufficiently until the detection passage is perforated. Since the replacement frequency can be reduced as compared with the prior art, there is an effect that it is possible to eliminate the waste of members and costs and to perform the safer and more efficient abrasive water jet processing than before.

It is a schematic block diagram of the jet catcher by the 1st Example of this invention, (a) is a side surface longitudinal cross-sectional view, (b) is a front longitudinal cross-sectional view. It is a schematic partial block diagram which shows the state which equipped the jet catcher of FIG. 1 at the front-end | tip of an abrasive water jet processing machine robot arm. It is a side longitudinal cross-sectional view which shows schematic structure of the jet catcher by the 2nd Example of this invention. It is a schematic structure figure showing an example of an abrasive water jet processing machine.

  The jet catcher of the present invention comprises a substantially cylindrical member having an internal space whose one end is an opening, and the cylindrical member closes the internal space at the other end facing the opening, and from the opening to the internal space. The jet that collided with the bottom surface through the internal space from the opening passes through the discharge port from the internal space in a state where the mechanical impact force is attenuated due to the loss of fluid energy due to the collision. The bottom portion having a predetermined thickness from the bottom surface to the rear end portion of the cylindrical member, at a predetermined position near the rear end portion of the cylindrical member, A jet detection passage is provided which is perforated along a direction intersecting with the central axis of the cylindrical member and has an opening at least one end of which is opened to the outside of the cylindrical member.

  Therefore, in the present invention, when a jet catcher installed coaxially with a nozzle for jetting continues to receive a jet penetrating the workpiece, the bottom portion of the jet catcher is perforated due to damage of its collision surface. Even in advance, the perforation first reaches a jet detection passage formed in a direction intersecting the jet injection axis, and the jet passing through the perforation passes through the detection passage to the outside of the bottom portion from the opening of the passage. Released as a mist jet. This ejected jet is mist-like because the mechanical impact force is mitigated by collision, reflection and friction with the inner wall in the detection passage, so it will not harm any nearby human beings Absent.

  That is, when a mist-like jet is confirmed, it can be determined that the bottom part has perforated to the vicinity of the rear end of the member. If the jet injection from the nozzle is stopped immediately, the jet completely penetrates the bottom part. Can be prevented. Also, if a person in the vicinity of the injection axis extension moves when the mist-like jet is confirmed, the remaining distance to the rear end can be safely withdrawn until complete penetration occurs. it can.

  Therefore, the actual position of the jet detection passage at the bottom portion is determined by the jet axial distance from the rear end of the member, while the jet perforation by the jet that has reached the detection passage travels that distance. For example, a time sufficient for the person to stop or to evacuate the surrounding person, that is, a time corresponding to the stop margin or the evacuation margin may be set to a distance that can be secured for several tens of seconds to several minutes, for example. This can be appropriately set according to the jetting conditions of the abrasive water jet, for example, from the speed at which the drilling of the jet proceeds in the material of the bottom portion.

  As described above, according to the jet catcher of the present invention, the bottom portion has only the thickness corresponding to the time required for the injection stop operation from the nozzle or the retraction until it penetrates the hole, The member is not exchanged in a state where it can be used sufficiently, the exchange frequency and waste of material are eliminated, and the cost can be reduced accordingly.

  The jet referred to in the present invention is not limited to either a water jet or an abrasive water jet. Further, in the jet detection passage of the present invention, it is sufficient to have at least one opening through which the discharge of the mist jet can be confirmed. However, by forming the detection passage in a penetrating state, both ends thereof are formed. It is good also as a structure which has two opening open | released out of a member. In this case, since the mist-like jet is discharged simultaneously at two locations, it is preferable in that the visual recognition is made faster and more reliably.

  In addition, the jet detection passage formed in the bottom portion does not always advance with the center of the perforation generated in the bottom member overlapping the central axis of the cylindrical member. In addition, it is desirable that a sufficient width is provided in the plane direction orthogonal to the central axis so that the detection passage is communicated. For example, a configuration in which one wide detection passage having a cross-sectional shape of a long hole is formed is the simplest. Moreover, it is good also as a structure which arranges the some channel | path with a relatively small cross-sectional area near each other. In this case, it is possible to cope with the perforation deviating from the central axis as in the case of substantially one wide type passage as a whole.

  Moreover, although the cylindrical main body of this invention can also be comprised only with one member, it is good also as what comprises not only this but combining another member. For example, a configuration in which the bottom portion is formed of a member separate from the upper portion and only the bottom member can be replaced is conceivable.

  That is, the cylindrical member is formed with an inner space between a substantially cylindrical main body member whose both ends are open and the other end of the main body member, and an opening on one end side. And a bottom member for receiving the jet introduced into the main body member, and the main body member is provided with a discharge port for discharging the jet after colliding with the bottom member from the internal space to the outside, near the rear end of the bottom member There is a configuration in which a jet detection passage having an opening that is perforated in a direction intersecting the central axis of the main body member and at least one end of which is opened to the outside of the member is provided at a predetermined position. In this configuration, only the bottom member that has been fully used is replaced until the perforation reaches the detection passage, and the cylindrical main body can still be used. This eliminates waste of the member and improves work efficiency. To do.

  Furthermore, the jet catcher may basically have a three-member configuration of a cylindrical main body member and a bottom member by using an opening portion for receiving a jet as another member on the introduction side. The introduction side member is attached to one end of the main body member, and has a through-passage that is coaxial with the main body member for receiving a jet from the outer opening and introducing the jet into the main body member. In this case, the jet introduced from the outer opening collides with the bottom member through an internal space between the introduction side member and the bottom member attached to the other end of the main body member, and the collision causes a loss of fluid energy. The mechanical impact force is attenuated and discharged from the internal space to the outside through the discharge port.

  The introduction-side member has a taper in which a through-passage through which the abrasive water jet is introduced is larger in diameter than the inner opening that exposes the inner opening to the inner space, and continuously decreases from the outer opening toward the inside of the main body member. Since it has a so-called funnel-like shape having a region, the jet is easily introduced into the main body member from the outer opening having a large diameter, and is difficult to bounce outward after the introduction.

  This introductory member also needs to be replaced only if there is a problem such as damage to the member. Furthermore, if various types having different apertures, taper angles, through-path lengths, and the like are prepared so as to be selectable, an optimum introduction-side member can be employed according to actual processing conditions. . In particular, in the case of machining in which the jet deviates from the central axis of the through-passage due to cutting delay and frequent direct hits to the periphery of the opening frequently occur, damage is severe, but waste of the member can be eliminated by replacing only the introduction side member.

  Note that the detection of mist jet discharge from the opening of the detection passage can be confirmed visually, but using various sensor devices, the detection unit is set near the opening of the detection passage and the detection is automatically warned. It is good also as a structure which can be performed. For example, a configuration in which the pressure of a mist jet is detected by a pressure sensor that can handle both gas and liquid, and the moisture of the mist jet is detected by a liquid leakage detection sensor or a water detection sensor. Is one that moves synchronously with the abrasive jet, and the catcher itself is preferably small and light. Therefore, it is desirable that the sensor device be as small and light as possible.

  A safe and efficient work environment is realized by installing the jet catcher of the present invention having the above configuration in an abrasive water jet processing machine. The machine is installed in such a manner that the jet catcher is moved in synchronism with the abrasive nozzle that injects the abrasive water jet, and the jet catcher is always connected to the abrasive nozzle so as to always receive the abrasive water jet after passing through the workpiece. The relative position is fixed so as to be maintained at regular intervals.

  That is, the jet catcher is provided at a predetermined interval from the abrasive nozzle at a position where the central axis of the main body member overlaps the jet axis of the abrasive water jet so as to face the abrasive nozzle. For example, as in the prior art, a configuration in which a jet catcher is fixed to a robot arm tip portion to which a nozzle device including an abrasive nozzle is mounted via a fixing jig having a desired length is simple. In addition, it is preferable that the interval between the abrasive nozzle and the jet catcher can be fixed so as to be changeable and adjustable so that an arbitrary interval can be selected according to actual jet injection conditions and the like.

  A jet catcher according to one embodiment of the present invention is shown in FIG. FIG. 1A is a longitudinal sectional view of the jet catcher in a side view, and FIG. 1B is a longitudinal sectional view of the jet catcher in a front view. The jet catcher 1 according to the present embodiment has, as a basic structure, a cylindrical main body member 2 and a through-passage 5 that is attached to one end of the main body member 2 and that receives an abrasive water jet and introduces it into the main body member 2. An inlet member 4 as an introduction side member provided coaxially with the member 2, and a plug member 6 as a bottom member that is attached to the other end of the main body member 2 and receives the abrasive water jet introduced into the main body member 2. It is comprised from. That is, the combination of the inlet member 4, the main body member 2, and the plug member 6 closes the internal space where one end side is an opening and the other end side facing the opening, and introduces the internal space from the opening to the internal space. The substantially cylindrical member of this invention provided with the bottom face which receives the made jet is comprised.

  The internal space between the inlet member 4 and the plug member 6 in the cylindrical main body member 2 becomes the attenuation portion 8, and the exposed surface of the bottom member 6 with respect to the internal space is the bottom surface of the attenuation portion 8, that is, the collision surface 7. Become. Therefore, the jet that has passed through the through-passage 5 of the inlet member 4 and is introduced into the main body member 2 collides with the collision surface 7 of the bottom member 6, and the momentum is attenuated. The attenuated abrasive liquid is discharged from the attenuation portion 8 to the outside through the discharge port 3 formed in the side portion of the main body member 2.

  The through-passage 5 of the inlet member 4 has a constant diameter from the outer opening toward the inner side of the main body member, and a constant diameter from the reduced diameter end of the tapered area 5a to the inner opening. It has a certain region 5b and has a so-called funnel shape. Accordingly, the jet is smoothly introduced from the outer opening into the attenuation portion 8, but the rebounding from the attenuation portion 8 to the outside is small, and the noise at the time of collision is suppressed.

  The plug member 6 is provided with a jet detection passage 9 formed along a direction intersecting the central axis of the main body member 2 at a predetermined position near the rear end thereof. In this embodiment, the jet detection passage 9 is formed in a penetrating state, and has two openings whose both ends are opened to the outside of the plug member 6. Therefore, even if the jet catcher 1 continues to receive the abrasive water jet penetrating the workpiece and the plug member 6 is damaged or drilled from the collision surface 7, the drilling first reaches the jet detection passage 9. For this reason, the jet that has passed through the perforation is buffered through the detection passage 9 and then becomes a mist-like jet that has no danger of harming any nearby human being. It is discharged to the outside of the bottom member 6.

  Therefore, when the discharge of the mist-like jet is confirmed, it can be determined that the bottom member 6 has been perforated to the vicinity of the rear end, and if the injection from the abrasive nozzle is immediately stopped, the abrasive water jet is completely discharged. It is possible to prevent the bottom member from penetrating. In addition, when the discharge of the mist-like jet is confirmed, the person around the processing area, particularly in the vicinity of the extension line of the injection axis, until the perforation proceeds through the remaining distance to the rear end and complete penetration occurs. You can evacuate safely.

  Therefore, the position of the detection passage 9 is determined by the distance d in the central axis direction of the main body member 2 that overlaps in the remaining injection axis direction until the perforation penetrates from the detection passage 9 to the rear end portion of the plug member 6. What is necessary is just to set suitably so that it may become thickness corresponding to the time required for an injection | pouring stop and evacuation movement like this. Since the penetration time varies depending on the material of the plug member, its density, and the like, the setting corresponding to the actually used member is performed. Further, the jet detection passage 9 in this embodiment has a configuration in which one cross-sectionally long hole is provided. In this way, by forming the detection passage 9 so as to be wide in the plane direction orthogonal to the central axis of the main body member 2, the perforation is detected even when the perforation generated in the plug member 6 proceeds slightly deviating from the central axis. The communication passage 9 is communicated well.

  For example, when the injection pressure of the abrasive water jet is 300 MPa for a cemented carbide plug member such as cemented carbide or ceramic, if the distance d is 3 to 5 mm, the time margin until complete penetration is 10 to 10 mm. 60 minutes can be secured.

  Further, in this embodiment, the inlet member 4 is attached to the main body member 2 by fixing the end portion of the inlet member 4 to the one end side opening of the main body member 2 in the fitted insertion state. As for the side dimension, the length of the constant-diameter region 5b of the through-passage 5 can be sufficiently secured. That is, for example, if the insertion end of the inlet member 4 reaches only the Y position in FIG. 1A and the length of the constant diameter region 5b is insufficient, the jet deviated from the central axis of the main body member 2 and the through-passage 5 Jy enters the internal space of the main body member 2 without hitting the inner wall surface of the constant diameter region 5b and easily collides with the inner wall surface of the main body member 2. In this case, not only the inner wall surface of the main body member but also the O-ring groove between the plug member 6 and the main body member 2 may be damaged. Therefore, in this embodiment, among the jets deviated from the central axis, the jets Jz that are introduced into the internal space without hitting the inner wall surface of the constant aperture region 5b all reach the collision surface 7 so that the aperture is constant. The length of the region 5b was set to define the size of the inlet member 4 on the side of the main body member 2, particularly the insertion side.

  On the other hand, the impact surface 7 of the plug member 6 was formed as a hollow bottom surface having a step 7x on the entire outer periphery. Thereby, it is possible to prevent the jet colliding with the collision surface 7 from flowing outside and interfering with the inner wall surface of the main body member 2.

  The jet catcher 1 having the above configuration can be used until it reaches the jet detection passage 9 without having to be replaced early for safety while leaving a sufficient usable portion as in the prior art. The replacement frequency is also reduced, so that waste is eliminated and costs can be reduced. In addition, the jet catcher 1 according to the present embodiment is mainly composed of the main body member 2, the inlet member 4, and the plug member 6, so that only the plug member 6 needs to be replaced, which is more efficient. .

  In addition, since the inlet member 4 can also be replaced, only the inlet member 4 needs to be replaced even if damage is caused by jet collision with the through-passage wall surface. In addition, a plurality of inlet members 4 can be prepared so as to be selectable in various designs having different overall lengths of the through passages 5, outer diameters of the outer openings of the tapered regions 5, taper angles, and the like. As a result, for example, a large-diameter type suitable for a large cutting delay and a small-sized type suitable for use in a narrow space can be appropriately selected and used for actual processing.

  The mist jet discharge from the opening of the jet detection passage 9 can be visually confirmed. However, if a sensor device is provided, the mist jet discharge is automatically detected and a warning is given. You can also. For example, if a sensing unit such as a pressure sensor, a leak detection sensor, or a water detection sensor is installed near the opening of the detection passage 9, the discharge is detected by detecting the pressure or moisture of the mist jet with these sensors. I can confirm.

  When the jet catcher 1 according to the present embodiment is provided in an abrasive water jet processing machine, the jet catcher 1 can always move synchronously with the nozzle by fixing the main body member 2 at a position facing the abrasive nozzle and on the same axis. And For example, as shown in FIG. 2, this state can be easily realized simply by fixing the robot arm tip 11 to which the nozzle device 13 is attached via the fixing jig 12 instead of the conventional jet catcher 20. The conventional fixing means can be used as it is without providing any special means.

  In the above-described embodiment, the opening portion for receiving the jet, the bottom portion for receiving the jet, and the damping portion are separated from each other, and a substantially cylindrical member is formed by combining these three members to form one jet catcher. Although the case has been shown, the present invention is not limited to this. Hereinafter, as a second embodiment of the present invention, a jet catcher composed of one substantially cylindrical member in which an opening portion, a damping portion, and a bottom portion are integrally formed will be described.

  In the jet catcher 21 according to this embodiment, as shown in the longitudinal sectional view of FIG. 3, the main body member 22 has a through-passage 25 for receiving a jet from an outer opening and introducing it into one end of one substantially cylindrical main body member 22. The internal space where the inner opening of the through passage 25 is exposed is formed continuously in the substantially central region of the main body member 22. In the present embodiment, this internal space becomes the attenuating portion 28, and the bottom surface of the internal space facing the opening of the through passage 25 becomes the collision surface 27 that receives the jet.

  In addition, a discharge port 23 for discharging the jet after collision from the attenuation unit 28 to the outside is formed in the side portion of the main body member 22 in a direction orthogonal to the central axis of the main body member 22. When the main body member 22 is made of cemented carbide and it is difficult to connect an external pipe directly to the discharge port 23 when the jet catcher 21 is adapted for an abrasive water jet, the discharge port 23 is connected to the main body member 22. What is necessary is just to set it as the structure connected to external piping via the joint member 24 attached to outer periphery.

  Further, the other end side of the attenuation portion 28 of the main body member 22 is a bottom portion, and is formed at a distance d from the rear end portion in the central axis direction of the main body member 22 along the direction intersecting the central axis of the main body member 22. A jet detection passage 29 is provided. Therefore, also in the jet catcher 21 according to the present embodiment, as in the case of the jet catcher of the first embodiment, when the damage / drilling generated in the collision surface 27 with the progress of use reaches the jet detection passage 29. This can be confirmed, and before the jet penetrates the member safely, the jet injection can be stopped or a nearby worker can be withdrawn.

  Therefore, the jet catcher 21 can be used without waste. Moreover, since the structure is basically one member, the manufacturing process can be simplified because the assembly process for integrating the plurality of members while aligning them is not necessary.

  In the above-described embodiment, the case where a single passage having a long hole shape with a wide cross section in the plane direction perpendicular to the central axis of the cylindrical member is provided as the jet detection passage is shown. However, the present invention is not limited to this, and a plurality of passages having relatively small cross-sectional areas may be provided in close proximity to each other. Even in this case, it is possible to cope with the perforation deviating from the central axis as in the case of substantially one wide passage as a whole.

1, 2: Jet catcher 2, 22: Main body member 3, 23: Discharge port 4: Inlet member (introduction side member)
5, 25: Through passage 5a: Tapered region 5b: Constant aperture region 6: Plug member (bottom member)
7, 27: Colliding surface 7x: Step 8, 28: Damping portion 9, 29: Jet detection passage d: Thickness distance 10 from the jet detection passage to the rear end of the plug member 10: Abrasive water jet processing machine 11: Robot Arm tip 12: Fixing jig 13: Nozzle device 14: Abrasive head 15: Abrasive nozzle 16: On-off automatic valve 20: Jet catcher 24: Piping joint member W: Workpiece

Claims (5)

In a jet catcher for receiving a jet ejected from a nozzle device,
It consists of a substantially cylindrical member provided coaxially with an internal space where one end side is an opening,
The cylindrical member closes the internal space at the other end facing the opening and receives a jet introduced into the internal space from the opening, and the jet after colliding with the bottom surface from the internal space to the outside. And having a predetermined thickness on the bottom portion extending from the bottom surface to the rear end portion of the cylindrical member,
The bottom portion is perforated at a predetermined position near the rear end of the cylindrical member along a direction intersecting the central axis of the cylindrical member, and at least one end thereof is outside the cylindrical member. A jet catcher comprising a jet detection passage having an opening to be opened. The cylindrical member forms an internal space between a substantially cylindrical main body member whose both ends are open and the other end of the main body member and is open on one end side, and from the opening to the internal space. A bottom member for receiving the introduced jet,
The main body member has a discharge port for discharging the jet after colliding with the bottom member from the internal space to the outside,
The bottom member is formed at a predetermined position near a rear end portion thereof along a direction intersecting with the central axis of the main body member, and has an opening at least one end of which is opened to the outside of the cylindrical member. The jet catcher according to claim 1, further comprising a jet detection passage. The cylindrical member is further provided with an introduction-side member that is attached to one end of the main body member and that has a through-passage that is coaxial with the main body member for receiving the jet from the outer opening and introducing the jet into the internal space of the main body member
The through-passage of the introduction side member has a tapered region in which the diameter of the outer opening is larger than the diameter of the inner opening exposed to the inner space, and the diameter is continuously reduced from the outer opening toward the inside of the main body member. The jet catcher according to claim 1 or 2, characterized by the above.   The jet catcher according to claim 1, further comprising a sensor device that detects a mist jet discharged from the opening of the detection passage.   The jet catcher according to any one of claims 1 to 4, wherein the jet catcher faces a nozzle for injecting a processing jet and positions the internal space on an extension of a central axis of the nozzle, and is predetermined from the nozzle. A jet processing machine characterized by being provided at regular intervals.

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