WO2013037405A1

WO2013037405A1 - Abrasive water jet cutting system

Info

Publication number: WO2013037405A1
Application number: PCT/EP2011/065915
Authority: WO
Inventors: Marco Linde; Thorsten Rentsch; Hans-Ulrich Poort; Hans-Jürgen Hoffmann; Stefan FILTER
Original assignee: Ant Applied New Technologies Ag
Priority date: 2011-09-14
Filing date: 2011-09-14
Publication date: 2013-03-21
Also published as: EP2755802A1; EP2755802B1; PL2755802T3

Abstract

The invention relates to an abrasive water jet cutting system comprising a high-pressure source (2) which provides high-pressure water, an outlet nozzle (8) and a high-pressure line (6) connecting the high-pressure source (2) to the outlet nozzle. The system further comprises an abrasive supply device (14) connected to the high-pressure line (6), said abrasive supply device (14) having a sluice with at least one chamber (40, 40'), said chamber (40, 40') having at least one first closable opening (50, 50') and being alternately openable towards the high-pressure line (6) and an abrasive supply unit.

Description

description

Water-abrasive suspension cutting system with the features specified in the preamble of claim 1.

Water-abrasive suspension cutters are used to cut materials by means of a high-pressure water jet to which an abrasive is added. In this case, in the case of a water-abrasive suspension cutting system, the water is mixed under high pressure upstream with an outlet gland with the abrasive. Thus, for example, part of the water flow can be guided through an abrasive container, which is designed as a pressure vessel. Such a system is z. B. from EP 1 199 136 known. The problem with these systems is the refilling of the abrasive because the plant must be taken out of service, the Abrasimittelbehälter must be brought to a depressurized state and only then can be filled. This is particularly problematic in industrial applications in which continuous cutting is desired.

It is therefore an object of the invention to improve a water-abrasive suspension cutting system to the effect that during operation, a supply of the abrasive in the high pressure region of the system without air supply is possible.

This object is achieved by a water-abrasive suspension cutting system with the features specified in claim 1. Preferred embodiments will become apparent from the subclaims, the following description and the accompanying figures. The water-abrasive suspension cutting system according to the invention has a high-pressure source, for example a high-pressure pump, which provides water under high pressure. This is a very high pressure, preferably a pressure up to 2500 bar or higher. Furthermore, the system has an outlet nozzle through which the pressurized water mixed with abrasive emerges for cutting. The outlet nozzle is connected to the high-pressure source via a high-pressure line, wherein an abrasive-agent feed device connected to the high-pressure line is present. Ie. As usual in the suspension cutting process, the mixture between water and abrasive in the high pressure area of the plant. For this purpose, for example, the high-pressure water is passed through a pressure vessel in which the abrasive is and in the pressure vessel, there is a mixture between water and abrasive and the water flushes the abrasive out of the high pressure vessel and performs it with up to the Outlet nozzle, where it then emerges together with the abrasive for cutting. The abrasive supply means serves, during operation of the plant, to introduce abrasive into the high-pressure area, ie into the high-pressure line, without having to decommission the plant and, in particular, without bringing the high-pressure area or part of the high-pressure area into a pressureless state. sen. In addition, the Abrasivmittelzufuhr takes place in the high pressure area so that no air is introduced into the high pressure area.

According to the invention, the abrasive agent supply device has a lock with at least one chamber. The chamber has at least a first fireable opening. By means of this opening, the chamber can be opened to the high-pressure line and closed again with respect to the high-pressure line. In addition, these first † e opening are selectively opened to a Abrasivmiffezufuhr out or it can be provided a further opening in the chamber, which can be opened to a Abrasivmittezufuhr out. The chamber can thus be opened alternately by means of the at least one opening or a plurality of openings to an abrasive agent supply and to the high-pressure line. Thus, the chamber forms a lock, which makes it possible to introduce the abrasive or an abrasive-water mixture at least with ambient pressure or a lower pressure than in the high pressure line to introduce into the chamber. The chamber can then be closed towards the environment or for the abrasive agent supply and be opened to the high-pressure region, ie the high-pressure line, so that the abrasive agent can then enter the high-pressure line from the chamber, without causing a significant pressure loss in the high-pressure line High-pressure line comes. Optionally, prior to opening the at least one first opening to the high pressure line, the pressure in the chamber may be increased to establish pressure equalization of the high pressure line prior to opening the opening. Particularly preferably, the chamber has two openings, which can be closed by valves, such as ball valves. A first opening adjacent to the high pressure line, a second opening of the chamber faces the abrasive supply. By opening and closing the openings by means of suitable valves, the chamber can be opened so alternately to Abrasivmittelzufuhr or to the high-pressure line. By arranging a plurality of such chambers, which are alternately opened to the high pressure line, a quasi-continuous Abrasivmittelzufuhr can be achieved in the high pressure line inside.

Particularly preferably, the abrasive-feeding device has a movable slide, in which the at least one chamber is trained. The slider is movable between at least two different positions. For this purpose, he preferably moves in a suitable leadership. The at least one chamber formed in the slide has the at least one first opening, which serves to allow abrasive material, which has previously been received in the chamber, to escape into the high-pressure region or the high-pressure line when the opening of the chamber is in one Position is moved, in which it faces an opening, that is, an inlet opening of the high-pressure line.

The opening can also serve to fill the chamber with abrasive. However, a second opening, ie an inlet opening, is preferably provided for this, as will be described below. Of the at least two positions between which the slide is movable, the first position is a position in which the first opening of the chamber is opposite to an inlet opening of the high-pressure line, ie the high-pressure area. In this position, as described, abrasive can escape from the chamber into the high pressure area. In this position, the chamber is otherwise sealed to the outside, so that no pressure loss from the high pressure area occurs and in this way from the chamber of the high pressure area during operation, without having to reduce the pressure in the high pressure area, can be filled. In the second position of the spool, the first opening of the chamber is located either opposite a closed wall or opposite an abrasive supply port. When the first opening faces an abrasive supply opening, the chamber can be filled with abrasive through the abrasive supply opening which is the outlet of an abrasive supply. If, in the second position, the first opening is opposite a closed wall and thus closed, the chamber is filled with abrasive agent. preferably by the aforesaid second opening, ie by a separate inlet opening, which is closed in the first position of the slide, for example by facing a closed wall.

Thus, according to the invention, the chamber of the slider is moved by movement of the slider from a filling position, i. H. the second position, in a discharge position, d. H. the first position, moved. This ensures that the chamber outside the high pressure area can be filled with abrasive, the filling can also be done under pressure or without pressure. Preferably, the chamber is filled with loose abrasive, which is mixed with water, so that the abrasive is introduced into the chamber without air. During filling, the high-pressure region is closed, preferably by a wall of the slide sealingly opposite the inlet opening of the high-pressure line. Only when the chamber is brought into the emptying position, in which its first opening facing the inlet opening, thereby, the high-pressure area is opened to the chamber of the slide, so that the abrasive can enter from the chamber in the high-pressure area, but without the high-pressure area over the Chamber must be opened to the outside. The abrasive is preferably evacuated by gravity from the chamber into the high pressure line. According to a preferred embodiment of the invention, the movable slide has at least two chambers formed therein, which each have at least one first opening.

The slide, in which the at least two chambers are formed, is movable between at least two positions. By this movement of the slide, the first openings of the chambers are alternately connected to an inlet opening of the high pressure line or the High pressure range brought to cover, so that can be alternately emptied into the high pressure area. For this purpose, in a first position of the slide, the opening of a first chamber is positioned opposite an inlet opening of the high-pressure line, while the opening of a second chamber is opposite to a closed wall or an abrasive-medium feed opening. If the opening of the second chamber is opposite to an abrasive supply opening, it can be used to refill the chamber with abrasive. At the same time, the first chamber, which was previously filled with abrasive, is emptied into the high-pressure area or the high-pressure line. In this case, the first chamber is closed to the outside, so that the high pressure line or the high pressure area remains sealed outside. The second chamber can be filled at the same time. This can be done either through the same opening or through a second opening, ie a separate inlet opening, in which case the first opening, as described, may be opposite a closed wall to be closed in this position. In the event that more than two positions or switching positions of the slider are provided, it is also conceivable that a chamber is completely closed in one position, that is neither emptied nor filled. In at least a second position of the slide, the opening of the second chamber is then positioned opposite an inlet opening of the high-pressure line, while the opening of the first chamber is opposite to a closed wall or an abrasive-medium feed opening. Ie. in this position, the second chamber can then be emptied into the high-pressure area, while the first chamber can be filled at the same time or, in the event that more than two chambers should be provided, is in an intermediate position in which it is neither filled nor emptied , By the arrangement of at least two separate chambers, it is possible to fill one chamber in the unpressurised state, while the other chamber is simultaneously opened to the high-pressure region and discharged. is empty. In this way it is possible by alternately filling and emptying of at least two chambers to fill the high-pressure area during operation quasi-continuously with abrasive. The two chambers thus form locks, which are alternately filled and emptied.

Preferably, the high-pressure line has an inlet opening and the openings of the at least two chambers can be brought alternately into a position opposite this inlet opening by movement of the slide. The slide is preferably designed so that, when the inlet opening of the high-pressure line is not opposite an opening of a chamber, the inlet opening of the high-pressure line is closed by a wall of the slide, so that the high pressure area remains sealed to the outside. When an opening of a chamber opposes the inlet opening, a connection is made from the inlet opening to the chamber so that the abrasive agent can enter the high pressure area from the chamber. This is preferably done by gravity, ie the opening of the chamber is arranged on the underside thereof. At the same time, a second chamber is removed from the inlet opening of the high-pressure line, so that this second chamber is not connected to the high-pressure area and can thus be filled simultaneously with abrasive in the unpressurized state. With movement of the slide, the second chamber can then be brought into connection with the high-pressure area by moving its opening into a position opposite the inlet opening of the high-pressure line, at the same time separating the first chamber from the high-pressure area. Then the first chamber can be filled again in the unpressurized state. Particularly preferably, the first opening of the chambers in each case forms an outlet opening and the chambers each have an inlet opening in addition to the outlet opening. Ie. in this embodiment the chambers are not filled and emptied through the same opening, but filled through the inlet opening and emptied through the outlet opening. In a first position of the slide, the inlet opening of a first chamber to an abrasive supply opening is opposite to an abrasive supply, so that abrasive agent can enter the inlet opening of the first chamber to fill it through this abrasive agent supply opening. At the same time, when two or more chambers are formed in the slider, the inlet opening of a second chamber faces a closed wall, so that the inlet opening of the second chamber is closed. Thus, the second chamber can be brought into contact with the inlet opening of the high-pressure line via the outlet opening, ie the first opening of the second chamber, without a pressure loss occurring through the inlet opening of the second chamber to the outside. In a second position of the slide, the inlet opening of the second chamber then faces an abrasive agent supply opening. The inlet opening of the first chamber is in the second position of the slide of a closed wall opposite. Ie. in this state, the first chamber is emptied through the outlet opening, while optionally the second chamber can be filled with abrasive.

Preferably, an abrasive supply opening is provided and the inlet openings of the at least two chambers can be brought alternately into a position opposite this one Abrasivmittelzufuhröff- by movement of the slide. Ie. the two chambers are alternately filled by the same abrasive supply port by alternately moving the chambers to a position in which the inlet port of the corresponding chamber faces the abrasive fluid supply port so that abrasive may enter the chamber inlet from the abrasive fluid supply port. Above or upstream of the abrasive supply port may be provided an abrasive fluid reservoir from which the abrasive material preferably exits by gravity through the Abrasivmit- telzufuhröffnung. If no inlet opening of a chamber of the Abrasivmittelzufuhröffnung opposite, this is preferably closed by a wall of the slider, so that no abrasive can escape. However, it is also possible to provide a plurality of abrasive supply ports such that either one abrasive agent supply port is provided for each chamber, each chamber being movable by movement of the spool in a first position in communication with the abrasive supply port and in a second position in communication with an inlet port the high-pressure line can be brought, wherein in the second position, the chamber is then not in communication with the Abrasivmittelzufuhröffnung. Alternatively, it is also conceivable to fill a plurality of chambers simultaneously via a plurality of abrasive agent supply openings, in the event that more than two chambers should be provided in the slide.

The slider may be formed according to a first embodiment as a linearly movable slide, wherein the slider is then moved by means of a suitable linear drive in an oscillating manner between the at least two position.

However, the slider is particularly preferably designed as a rotary valve. This allows a particularly easy drive, since directly a rotating drive, such as an electric motor can be used. In addition, it is not necessary to reverse the direction of movement, but rather it is preferred that the rotary valve has a rotary drive which causes a continuous drive in one direction of rotation. In this case, the drive or rotational speed can be adjusted in order to be able to change the change in the rotational speed, the amount of the supplied abrasive per unit time. Preferably, an abrasive supply with an abrasive supply opening is provided. The high-pressure line has an inlet opening and the rotary valve preferably has at least two chambers, of which in a first position of the rotary valve a chamber with an opening, preferably a separate inlet opening of the abrasive supply opening and a chamber with an opening of the inlet opening of the high-pressure line. Ie. one chamber is filled with abrasive via the abrasive supply port, while the second chamber is simultaneously deflated into the high pressure conduit entrance. The filling is therefore preferably in the unpressurized state or with lower pressure than prevails in the high pressure line, while the emptying of the chamber in the high pressure line under pressure, ie when opening the chamber to the high pressure line out, there is a pressure equalization, ie the pressure in the Chamber rises to the level of pressure in the high pressure line. At the same time the chamber remains sealed to the outside, so that there is no pressure loss to the outside.

According to a particular embodiment, the rotary valve can have at least three chambers, of which a third chamber, when the first and the second chamber are opened to the abrasive supply or the high-pressure line, be closed both to the abrasive supply and to the high-pressure line. By arranging more than two chambers, the angle of rotation for moving the chambers further from one position to the next can be reduced, so that overall the quantity of abrasive supplied can be increased at the same rotational speed.

The rotary valve is preferably designed as a rotatable disc, in which the at least one chamber extends as a through hole from a first surface to a second surface opposite to the axis of rotation. The surfaces extend It preferably substantially horizontally so that the through holes extend substantially from top to bottom. This has the advantage that the chambers formed in this way can be filled with abrasive from above by the action of gravity, and that the abrasive can also escape from the chamber again by the action of gravity. Ie. the upper opening of the through hole forms an inlet opening, while the lower end forms an outlet opening. Particularly preferably, the through holes extend parallel to the axis of rotation of the rotary valve.

The slide is preferably guided between two sealing surfaces extending parallel to the direction of movement of the slide, wherein a first surface of the rotary slide rests on a first sealing surface and a second surface of the slide on an opposite second sealing surface. This ensures that the surface of the slide can close openings in the sealing surfaces and at the same time the sealing surfaces can close openings in the slide, depending on the position of the slider. In this way, the openings of the chambers can be opened and closed, depending on which position they are in, whether they are an opening in the sealing surface, d. H. the inlet opening or Abrasivmittelzufuhröff- opening or opposite the closed wall of the sealing surface. In the case that the slider is a rotary valve, the sealing surfaces extend normal to the axis of rotation of the rotary slide.

An abrasive supply opening of the abrasive supply is preferably formed in the first sealing surface. Furthermore, an inlet opening of the high-pressure line in the second sealing surface is preferably formed. Depending on the position of the slide, the openings in the sealing surfaces are closed or opened, depending on whether you are open- tion of the chambers opposite or a closed wall of the surfaces of the slider.

Particularly preferably, the at least one inlet opening of the high-pressure line opens into a pressure vessel located in the high-pressure line. This pressure vessel is preferably a reservoir for the abrasive, from which the abrasive is flushed out by the high pressure water flow. The pressure vessel is filled by the above-described abrasive supply means quasi continuously during operation under pressure. At the same time, however, the pressure vessel forms a certain buffer for abrasive.

According to a particular embodiment of the invention, the chambers in the slider or an abrasive supply upstream of the Abrasivmittelzufuhröff voltage may be provided with pressurizing means. This makes it possible to fill the abrasive already under pressure in the chamber of the slide. Thus, the pressure difference between the interior of the chamber and the high pressure line can be reduced, which simplifies the sealing and can accelerate the filling process. As a pressurizing means may serve a mechanical means for generating a higher pressure in a closed chamber of the abrasive supply, such as a movable piston. Alternatively or additionally, a medium under high pressure from the outside can be supplied, for example, also part of the high pressure water flow from the high pressure source to the cutting nozzle.

The invention will now be described by way of example with reference to the accompanying drawings. In these shows:

1 shows schematically a water-abrasive suspension cutting system according to the invention, FIG. 2 is a sectional view of an abrasive supply means according to a first embodiment; FIG. 3 is a sectional view of an abrasive supply means according to a second embodiment; and FIG

4 schematically shows an abrasive feed device according to a third embodiment.

The water-abrasive suspension cutting device according to the invention has, in a known manner, a high-pressure pump 2, which forms a high-pressure source and is connected to a water supply 4. From the high-pressure pump 2, a high-pressure line 6 leads to a cutting or discharge nozzle 8, from which an abrasive-enriched high-pressure water jet 10 for cutting or surface treatment of a workpiece 12 emerges. On the way from the high-pressure pump 2 to the outlet nozzle 8, the high-pressure line 6 passes through an abrasive supply device 14, in which abrasive 16 is introduced without introducing air into the high-pressure region formed by the high-pressure line 6 and in the high-pressure region with the underflow in the high-pressure line Pressure water is mixed so that it exits together with the water jet 10 from the outlet nozzle 8.

In the example shown here, the unit 18, which is essentially formed by the abrasive supply device 14 and the discharge nozzle 8, is attached to a positioning system 20, which is shown here schematically as a coordinate system, with which the discharge nozzle 8 relative to the workpiece 12 can be moved to produce a desired cutting path or processing history in the workpiece 12. The positioning system, for example, a robot or be another suitable positioning system. Alternatively, however, the abrasive supply means 14 may be placed separately from the discharge nozzle 8 and connected to the movable discharge nozzle via a movable pipe or a pressure hose.

The abrasive supply means 14 will be explained with reference to two embodiments shown in Figs. 2 and 3. The abrasive supply device is formed by a lock system formed in a slide. The abrasive supply means 1 4 has a Druckbehä age 22, which is located in the high-pressure line 6. Ie. At least one branch of the flow path of the high-pressure line 6 leads through the pressure container 22. For this purpose, the pressure container 22 has an inlet 24 and an outlet 26. Through the inlet 24, the high-pressure water flows into the pressure vessel 22 a. Through the outlet 26, the water flows out with the co-funded abrasive and then flows to the outlet nozzle 8. Above the pressure vessel 2, a rotary valve 28 between two sealing plates 30 and 32 is arranged. The rotary valve 28 is rotatable about an axis of rotation X by an electric drive motor 34. The sealing plate 30 has a first sealing surface 36, which rests against a first surface of the disk-shaped rotary valve 28. The second sealing plate 32 has a second sealing surface 38, which rests against a second opposite surface of the rotary valve 28. The surfaces of the rotary valve 28 and the sealing surfaces 36 and 38 extend at right angles to the axis of rotation X.

In the rotary valve 28 chambers 40 are formed in the form of through holes, which extend between the two opposite the sealing surfaces 36 and 38 adjacent surfaces of the rotary slide 28 para IIEL to the axis of rotation. In Fig. 2, two chambers 40 can be seen in Sch nitt and another Ka mmer 40 'is indicated by dashed lines. All chambers 40, 40 'lie within the same radius. de † from the axis of rotation X. In the † † † † † † † 30 an abrasive supply opening 42 is arranged, which is open to the sealing surface 36 at a position which is the same radius from the axis of rotation X as the chambers 40 spaced. The abrasive supply opening 42 is connected to an abrasive supply 44, through which abrasive or low addition of water is supplied. The wet supply of the abrasive 46 has the advantage that the abrasive can be introduced into the high-pressure region of the high-pressure line 6 without air. The chamber 40 in the rotary valve 28, which is shown in Fig. 2 left, is in a first position in which the chamber 40 with its inlet opening 48 which forms the upper end of the chamber 40, the abrasive supply opening 42 opposite. Thus, the abrasive, optionally with the addition of water from above into the chamber 40 occur. The outlet opening 50 at the lower end of the chamber 40 is opposite the sealing surface 38 and is closed by this. At the same time, a second chamber 40, which is shown on the right in FIG. 2, lies at a second position, into which its inlet opening 48 faces the first sealing surface 36 and is closed by the latter. The outlet opening 50 of this chamber at the lower end of the inlet opening 52 of the high pressure line 6 and the high pressure area opposite. The inlet opening 52 of the high-pressure region extends through the sealing plate 32 from the sealing surface 38 into the interior of the pressure vessel 22. In this state, the abrasive element 46 can escape from the chamber 40 by gravity into the pressure vessel 22 in order to fill the pressure vessel 22 , Subsequently, the rotary valve 28 is further rotated by the drive motor 34 in the direction of rotation D, so that the chamber 40 shown on the left in Fig. 2 reaches the right position and is emptied there accordingly. At the same time then the previously right-facing chamber 40 is moved to the left position and filled there as described. This is the operation with two chambers 40. However, in the rotary valve 28 as well more than two chambers 40, for example, four chambers are arranged, which are preferably distributed uniformly over the circumference of the rotary valve 28. Such further chambers 40 'are shown in dashed lines in FIG. It can be seen that the chamber 40 'is in an intermediate position in which both its inlet opening 48' and its outlet opening 50 'are closed by the sealing surfaces 36 and 38.

Fig. 3 shows a further variant of the Abrasivmittel- supply device according to the invention. In contrast to the embodiment shown in FIG. 2, the rotary valve 28 according to FIG. 3 has only one chamber 40. Ie. in this embodiment, simultaneous filling and simultaneous emptying of another chamber 40 is not possible. Instead, one and the same chamber 40 is alternately filled and emptied by placing it once in the position shown in Fig. 3, in which it faces the inlet 52 of the pressure vessel 22 and then rotated 180 ° to a second position in that it opposes the abrasive supply opening 42. Moreover, in the embodiment according to FIG. 3, a pressurizing means is still provided. For this purpose, a storage space 58 is arranged above the sealing plate 30, ie upstream of the abrasive supply opening 42. The abrasive agent supply 44 initially takes place in the storage space 58. The storage space 58 is connected to a pressure-applying means, so that the pressure of the abrasive-water mixture in the storage space 58 can be increased, so that the abrasive-water mixture already enters the abrasive supply opening 42 and the chamber 40 under pressure. In this way, the chamber 40 can be filled faster, on the one hand, on the other hand reduces the pressure difference between the interior of the chamber 40 and the pressure vessel 22. The arrangement of this pressure Applying means would also be possible in the embodiment of FIG. 2 accordingly.

The pressurizing means consists in this Fa ll from a lockable pressure supply 60. This is, for example, connected to the high-pressure line 6 and has a shut-off valve 62. At the Abrasivmittelzufuhr 44 a shut-off valve 64 is also arranged. When the storage space 58 has been filled with abrasive 46 by opening the shut-off valve 64, the shut-off valve 64 can be closed and the shut-off valve 62 opened, thus pressurizing the storage space 58 so that the abrasive-water mixture already exists under pressure enters the chamber 40 of the rotary valve 28. Before reopening the shut-off valve 64, a pressure relief of the storage chamber 58 can be achieved by opening a further shut-off valve 66. By means of the shut-off valve 66, pressurized water can emerge from the storage space 58 and, for example, can be supplied to the input side of the high-pressure pump 2 again. In the described embodiment, the supply of loose abrasive 46 has been described. However, it is also conceivable to supply in the chambers 40 of the rotary valve 28 abrasive in bound form, for example in the form of pellets. In this way, loose abrasives are prevented from damaging the sealing surfaces 36 and 38 and adversely affecting the sealing of the pressure vessel 22.

The third embodiment of the invention, which is shown in Fig. 4, differs in structure of the abrasive supply means dispensing with a movable slider. Thus, upstream of the inlet opening 52 of the pressure vessel 22 is followed by a lock chamber or chamber 70, which at the lower end has a first opening 52 facing the first opening, which through a first ball valve 72 can be closed. Upstream of the chamber 70, a second ball valve 74 is disposed adjacent to an abrasive supply port 42 of an abrasive supply 44. In the position shown in Fig. 4, the second upper ball valve 74 is closed and the first lower ball valve 72 is opened, so that the chamber 70 is open to the inlet opening 52 and thus to the pressure vessel 22. In this position, the abrasive can escape from the chamber 70 into the pressure vessel 22. After emptying the chamber 70, the ball valve 72 is closed and the ball valve 74 is opened so that abrasive can enter the chamber 70 from the abrasive supply port 42. Subsequently, the ball valve 74 is closed and the shut-off valve 62 of a pressure supply 60 can be opened, so that, as described with reference to FIG. 3, the chamber 70 is pressurized. The pressure supply 60 can, as described with reference to FIG. 3, be connected to the high-pressure line 6. The chamber 70 has a further shut-off valve 66 for pressure relief to the outside. Thus, the shut-off valve 66 can be opened before the ball valve 74 is opened to fill the chamber 70, so that the pressure from the chamber 70 can be reduced. The shut-off valve 66 can be connected on the output side to the water supply 4. Also, it is possible via the shut-off valves 62 and 66 to flush the chamber 70 when both shut-off valves 62 and 66 are opened and the ball valves 72 and 74 are both closed. The abrasive agent supply 44 above the ball valve 74 is preferably metered. Ie. the abrasive agent supply 44 has a metering device which is designed so that only such an amount of abrasive agent is supplied into the chamber 70, which chamber 70 can also receive. Ie. the amount of supplied abrasive is not limited by closing the ball valve 74 but by an upstream metering device. This will ensured that the ball valve 74 when closing is substantially free of Abrasivmiffel.

In the exemplary embodiments, a fill level sensor 68 can be arranged in the pressure vessel 22. The level sensor 68 detects the level of abrasive 46 inside the pressure vessel 22. If the level of the abrasive 46 falls below a predetermined level in the pressure vessel 22, abrasive can be supplied by rotating the rotary valve 28 or by opening and closing the ball valves 72 and 74 in FIG previously described manner until the level in the interior of the pressure vessel 22 reaches a predetermined maximum again.

LIST OF REFERENCE NUMBERS

2 high pressure pump

4 water supply

6 high pressure line

8 outlet nozzle

10 high-pressure water jet

12 workpiece

14 abrasive feed device

1 6 abrasive

18 assembly

20 positioning system

22 pressure vessels

24 inlet

26 outlet

28 rotary valve

30 sealing plate

32 sealing plate

34 Electric drive motor

36 sealing surface

40, 40 'chambers

42 abrasive feed opening

44 abrasive feed

46 abrasive

48, 48 'inlet opening

50, 50 'outlet opening

52 inlet opening

58 storage space

60 pressure supply

62 shut-off valve

64 shut-off valve 66 Shut-off valve 68 Level sensor 70 Chamber 71, 74 Ball valves

D Direction of rotation X axis of rotation

Claims

claims

A water abrasive suspension cutting machine comprising a high pressure source (2) providing water under high pressure, an outlet nozzle (8) and a high pressure line (6) connecting the high pressure source (2) to the outlet nozzle, one communicating with the high pressure line (6). connected abrasive feed device (14) is present, characterized in that

the abrasive means feed means (14) comprises a lock having at least one chamber (40, 40 ', 70), the chamber (40, 40', 70) being provided with at least one first closable opening (50, 50 ') and alternately to the high pressure line (6) and an abrasive supply can be opened.

Water-abrasive suspension cutting system according to claim 1, characterized in that

the abrasive supply means (14) comprises a movable slide (28) in which the at least one chamber (40, 40 ') is formed and

the slide (28) is movable between at least two positions, wherein in a first position of the slide the first opening (50) of the chamber faces an inlet opening (52) of the high-pressure line (6) and in a second position of the slide the first opening (50 , 50 ') of the chamber (40, 40') is opposite a closed wall (38) or abrasive supply opening.

Water-abrasive suspension cutting system according to claim 2, characterized in that the movable slide (28) has at least two chambers formed therein (40, 40 '), each having at least a first opening (50, 50'), and Slider (28) movable between at least two positions is, wherein in a first position of the slide, the opening (50) of a first chamber (40) of an inlet opening (52) of the high pressure line opposite, while the opening (50, 50 ') of a second chamber of a closed wall (38) or an abrasive - Opposite opening and in a second position of the

Slider opposite the opening (50) of the second chamber (40) of an inlet opening (52) of the high-pressure line, while the opening (50, 50 ') of the first chamber of a closed wall (38) or an Abrasivmittelzufuhröffnung opposite.

Water-abrasive suspension cutting system according to claim 3, characterized in that the high-pressure line (6) has an inlet opening (52) and the openings (50, 50 ') of the at least two chambers by movement of the slide (28) alternately into one of these an inlet opening (52) opposite position can be brought.

Water-abrasive suspension cutting system according to claims 2 to 4, characterized in that the first opening (50, 50 ') of the chambers (40, 40') each forms an outlet opening and the chambers adjacent to the outlet opening (50, 50 '). ) each have an inlet opening (48, 48 ') and in a first position of the slide, the inlet opening (48) of a first chamber (40) of an abrasive agent supply opening (42) opposite, while in a second position of the slide (28) the inlet opening (48 , 48 ') of the first chamber (40, 40') opposite a closed wall (35).

6. water-abrasive suspension cutting system according to claim 5, characterized in that in the slide (28) at least two chambers (40, 40 ') are formed and in a first position of the slide, the inlet opening (48) of a first chamber ( 40) one Abrasivmittelmittelöffnung (42) opposite, while the inlet opening (48, 48 ') of a second chamber (36) opposite to a closed wall and in a second position of the slide, the inlet opening (48) of the second chamber (40) of an abrasive supply opening (42) opposite while the inlet opening (48, 48 ') of the first chamber (40, 40') opposite to a closed wall (36).

A water-abrasive suspension-cutting machine according to claim 6, characterized in that an abrasive supply opening (42) is provided and the inlet openings (48, 48 ') of the at least two chambers (40, 40') by movement of the slide (28) alternately in one of these a Abrasivmittelzufuhröffnung (42) opposite position can be brought.

8. water-abrasive suspension cutting system according to claims 1 to 7, characterized in that the slide is designed as a linearly movable slide.

Water-abrasive suspension cutting system according to one of claims to 2 to 7, characterized in that the slide is designed as a rotary valve (28).

Water-abrasive suspension cutting system according to claim 9, characterized in that the rotary valve (28) has a rotary drive (34), which causes a continuous drive in a rotational direction (D).

1 1. Water-abrasive suspension cutting installation according to one of claims 9 or 10, characterized in that an abrasive supply with an abrasive supply opening (42) is provided, the high-pressure line (6) has an inlet opening (52) and the rotary valve (28) has at least two chambers (40, 40 '), of which in at least a first position of the rotary valve (28) a chamber (40) having an opening (48 ) of the Abrasivmittelzufuhröff- opening (42) and a chamber (40) with an opening (50) of the inlet opening (52) opposite.

A water-abrasive suspension cutting system according to claim 1 1, characterized in that the rotary valve (28) has at least three chambers (40, 40 '), of which a third chamber (40'), when the first and the second chamber ( 40) are opened to the abrasive medium supply (44) or the high-pressure line (6), is closed both to the abrasive supply (44) and to the high-pressure line (6).

Water-abrasive suspension cutting system according to one of claims 9 to 12, characterized in that the rotary valve (28) is designed as a rotatable disc, in which the at least one chamber (40, 40 ') as a through hole from a first surface to extending in the direction of the axis of rotation (X) opposite second surface. 14. Water-abrasive suspension cutting system according to claims 2 to 13, characterized in that the slide (28) between two parallel to the direction of movement extending sealing surfaces (36, 38) is guided, wherein a first surface of the slide (28) on a first sealing surface and a second surface of the slider (28) on an opposite second sealing surface

(38) is present.

15. Water-abrasive suspension cutting system according to claim 14, characterized in that an abrasive supply opening (42) of the abrasive agent supply (44) in the first sealing surface (36) is formed.

Water-abrasive suspension cutting system according to claim 14 or 14, characterized in that an inlet opening (52) of the high-pressure line (6) is formed in the second sealing surface (38).

Water-abrasive suspension cutting system according to claims 2 to 1 6, characterized in that the inlet opening (52) of the high-pressure line (6) opens into a pressure vessel (22) located in the high-pressure line (6).

A water abrasive slurry slicer according to claims 2 to 14, characterized in that the at least one chamber (40, 40 ') in the spool (38) or an abrasive supply (44) upstream of the abrasive supply port (42) is provided with pressurizing means (54 ) are provided.