• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a method for operating a system for water-jet cutting with a high-pressure pump (1) having a plurality of plungers (2) and a high-pressure pump (1) connected to a high-pressure pump (1), which has a cutting head valve (11) is connected to a cutting head (8), wherein for the cutting operation, the high-pressure pump (1) is driven and the cutting head valve (11) is opened. In order to provide advantageous cutting conditions at the beginning of a cutting operation, it is proposed that at the end of the cutting operation, the high pressure pump (1) during the closing of the cutting head valve (11) while maintaining the pressure in the high pressure line (8) stopped and at the beginning of the cutting operation during opening the cutting head valve (11) is put into operation again.
    公开号:AT515943A4
    申请号:T50747/2014
    申请日:2014-10-20
    公开日:2016-01-15
    发明作者:
    申请人:Perndorfer Andreas；
    IPC主号:
    专利说明:

    The invention relates to a method for operating a plant for water jet cutting with a high-pressure pump having a plurality of plungers connected to a water tank and having a high-pressure line connected to the high-pressure pump, which is connected to a cutting head via a cutting head valve, wherein the Schneidvorgang the Hochdruckpum¬pe driven and the cutting head valve is opened, as well as on a suitable gegeeignete plant for water jet cutting.
    Due to the high pressures and comparatively high flow rates required for water jet cutting, high pressure pumps with plunger are frequently used for water jet cutting systems. With the arrangement of three plungers, the pressure fluctuations can be reduced to a level permissible for water jet cutting, so that pressure accumulators can be dispensed with to compensate for such pressure fluctuations , The plunger pumps are usually driven by three-phase motors, which are controlled via a frequency converter, which specifies the speed required for the respective desired delivery rate. The sucked by the high-pressure pump from a water tank water is therefore supplied with the set pressure, depending on the Schneidbe¬dingungen, for example between 500 and 4000 bar, through a high-pressure line to the cutting head, where it through a pure water nozzle with a Geschwin¬digkeit up to 800 m / s (at a delivery pressure of 4000 bar) escapes before the water jet is optionally supplied with abrasive. To terminate the cutting operation, a cutting head valve upstream of the clean water nozzle is closed and the three-phase motor is shut down to a low speed in order not to have to start the high-pressure pump from a standstill for another cutting operation. The amount of water delivered by the high-pressure pump after the cutting head valve is blocked is returned via a return line to the water tank, which is released by closing the cutting head valve by a return valve. For a new cutting operation, the cutting head valve is consequently to be opened, the return valve closed and the high-pressure pump accelerated to the required operating speed so that the required operating pressure builds up gradually within the high-pressure line connected to the cutting head the sectional image changes during the start of the cut due to the time increase of the water outlet speed from the pure water nozzle, which has a disadvantageous effect especially in the case of incisions, that is to say cutting processes that do not start from a workpiece edge but start within a workpiece surface.
    The invention is thus based on the object of being able to operate plants for water jet cutting with plunger pumps such that a sufficient cutting pressure is available in order to be able to ensure a uniform sectional image from the start without using a pressure reservoir to have to.
    Based on a method of the above, the invention solves the problem posed by the fact that at the end of the cutting process, the Hochdruckpumpe shut down while closing the cutting head valve while maintaining the pressure in the high pressure line and at the beginning of the cutting process during the opening of the cutting head valve back into operation is taken.
    According to these measures, since the pressure in the high pressure line is not released when the cutting head valve is stopped to stop the cutting operation, this pressure is available for restarting a cutting operation, so that the cut can be made immediately after opening the cutting head valve at the operating pressure. The prerequisite is that the high-pressure pump is accelerated within the opening time for the cutting head valve to the speed required for the respective operating pressure in the high-pressure line or shut down within the closing time of this valve. There is therefore no need for a return line to return the otherwise subsidized during the cutting break water in the water tank.
    If a lower operating pressure in the high-pressure line is required for a subsequent cutting operation, as is usually the case when a puncture is to be made, the pressure in the high-pressure line must be correspondingly lowered before opening the cutting-head valve, so that the cutting operation when opening the cutting-head valve with the reduced operating pressure can be performed.
    Conventional drives of the plunger pumps by means of three-phase motors, which are driven via frequency corresponding to the required speed, are generally unable to accelerate the plunger pump to the target speed or to decelerate from the target speed to the standstill within the short opening and closing times of the cutting head valves. For this reason, in installations for water-jet cutting which are suitable for the method according to the invention, it is proposed that the drive of the high-pressure pump comprises a servomotor with a servo converter which is switchable as a function of the actuation of the cutting head valve and that for driving desServoumrichters on the one hand to a setpoint generator and on the other hand to a Ist¬wertgeber for the pressure in the high pressure line connected regulator is vorgese¬hen. With the aid of such servo drives, the required accelerations can be achieved within milliseconds so that the respective predetermined water pressure is abruptly available when the cutting head valve is opened. Since the control of the servo converter is carried out as a function of the setpoint-actual value difference of the pressure in the high-pressure line , Changes affecting the flow resistance in the area of the pure water nozzle do not play a role, because, for example, wear phenomena at the pure water nozzle are automatically taken into account by this control of the servo inverter.
    To be able to lower the pressure in the high-pressure line during a cutting break with regard to the pressure requirements of a subsequent cutting operation if necessary, the high-pressure line can be connected to a return line via an adjustable pressure reducing valve, which preferably also serves to shut off the return line, if the pressure reducing valve is not required.
    With reference to the drawing, which shows a system for water jet cutting in a schematic block diagram, the inventive method is explained in more detail.
    The plant for water jet cutting has a high-pressure pump 1 with three plunger 2, which are driven by a servomotor 4 via a crankshaft 3. The water required for cutting a workpiece is withdrawn from a water container 5 via a suction line 6 connected to the high-pressure pump 1 and fed to a cutting head 8 by a high-pressure line 7 connected on the pressure side to the high-pressure pump 1. This cutting head 8 comprises a pure water nozzle 9 for generating a water jet for cutting the workpiece. If necessary, abrasives can be mixed with the jet of water emerging from the clean water nozzle 9 in order to increase the cutting performance, as indicated by the arrow 10. The clean water nozzle 9 is preceded by a cutting head valve 11, via whose actuating drive 12 the cutting head 8 can be switched on and off.
    To control the speed of the servo motor 4, the servomotor 4 associated servo inverter 13 is acted upon by a speed sensor 14. In addition, the actual value of the pressure in the high-pressure line 7 is detected by an actual-value transmitter 17 connected to the high-pressure line 7 and forwarded to the controller 15, so that the Servo inverter 13in dependence on the setpoint-actual value difference of the pressure in the high-pressure line 7ansteuergesteuert.
    If the cutting head valve 11 is closed by the actuator at the end of a cutting process, the pressure in the high-pressure line 7 abruptly increases, which leads to a shutdown of the servo motor 4 via the controller 15, wherein the pressure in the high pressure line 7 is maintained and thus for the subsequent Schneid¬ process is available again.
    To initiate the subsequent cutting operation, the cutting head valve 11 is to be opened again via the actuating drive 12 and at the same time to accelerate the servomotor 4 to the pump speed associated with the desired value of the pressure in the high-pressure line 7, namely within the opening time for the cutting head valve 11, which has a common cause the control of the actuator 12 for the Schneidkopf¬ 11 successful control of the servo 13 is readily possible. This means that the new cutting process can be started with a delivery pressure of the water in the high-pressure line 7 that corresponds at least approximately to the desired value so that there are no changes in the sectional image during the cutting process.
    If, due to the cutting conditions of a subsequent cutting operation, the setpoint values for the pressure in the high-pressure line 7 are to be reduced, the pressure in the high-pressure line 7 can be lowered via a pressure-reducing valve 18 in a return line 19 connected to the high-pressure line 7 with a corresponding nominal value specification in the preceding cutting break. If the pressure reducing valve 18 is not needed, the return line 19 can be shut off via the pressure reducing valve 18 when its actuator 20 is driven accordingly.
    权利要求:
    Claims (4)
    [1]
    1. A method for operating a plant for water jet cutting with a plurality of plunger (2), to a water tank (5) angeschlos¬senen high-pressure pump (1) and with a high-pressure pump (1) angeschlos¬senen high-pressure line (7) over a cutting head valve (11) is connected to a cutting head (8), the high pressure pump (1) being driven and the cutting head valve (11) being opened for the cutting operation, characterized in that at the end of the cutting process the high - pressure pump (1) is activated during the cutting process Closing ßens the cutting head valve (11) while maintaining the pressure in the Hoch¬ pressure line (8) stopped and at the beginning of the cutting process during the Öff¬nens the cutting head valve (11) is put back into operation.
    [2]
    2. The method according to claim 1, characterized in that the pressure in the high-pressure line (7) before the opening of the cutting head valve (11) can be lowered to a predeterminable value.
    [3]
    3. Plant for water jet cutting with a plurality of plunger (2) auf¬weisenden, to a water tank (5) connected, drivable Hoch¬druckpumpe (1) and with a to the high pressure pump (1) connected high-pressure line (7) via a cutting head valve (11) is connected to a cutting head (8), characterized in that the drive of the high pressure pump (1) comprises a servomotor (4) switchable in dependence on the operation of the cutting head valve (11) with a servo inverter (13) and in that a controller (15) which is connected on the one hand to a setpoint generator (16) and, on the other hand, to an actual value generator (17) for the pressure in the high-pressure line (7) is provided for controlling the servo-converter (13).
    [4]
    4. Plant according to claim 3, characterized in that the Hochdrucklei¬tung (7) via an adjustable pressure reducing valve (18) to a return line (19) is connected.
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    DK3012075T3|2018-03-19|
    SI3012075T1|2018-04-30|
    PL3012075T3|2018-09-28|
    HUE036924T2|2018-08-28|
    RS57018B1|2018-05-31|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US5799688A|1990-12-20|1998-09-01|Jetec Company|Automatic flow control valve|
    US6176437B1|1993-10-15|2001-01-23|Mona Skannerup|Blast gun for compressed air|
    DE69528272T2|1994-06-24|2003-07-10|Electro Res Internat Pty Ltd|Metal glass cutter and method|
    AT413086B|2000-01-31|2005-11-15|Franz Perndorfer|2-AXIS WATERJET SLICER|
    US20050181713A1|2004-02-17|2005-08-18|Disco Corporation|Water jet-processing machine|
    US20050191951A1|2004-02-23|2005-09-01|Disco Corporation|Water jet-processing machine|
    EP1803528A1|2004-10-18|2007-07-04|Sodick Co., Ltd.|Method of processing electrically conductive workpiece and combined processing apparatus|DE102018102153A1|2018-01-31|2019-08-01|Hammelmann GmbH|Device for processing a workpiece|AT380422B|1984-04-25|1986-05-26|Ver Edelstahlwerke Ag|LIQUID JET CUTTER|
    JP3995227B2|1999-01-21|2007-10-24|株式会社スギノマシン|Liquid pressurizer|
    CN103154532B|2010-09-13|2016-03-16|泰克铌水刀有限公司|Superpressure pump|AT519687A1|2017-03-01|2018-09-15|Bft Gmbh|Fluid jet or water jet cutter|
    DE102018124978A1|2018-10-10|2020-04-16|Alfred Kärcher SE & Co. KG|Apparatus and method for providing pressurized fluid to multiple consumers|
    法律状态:
    2020-08-15| MM01| Lapse because of not paying annual fees|Effective date: 20191020 |
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50747/2014A|AT515943B1|2014-10-20|2014-10-20|Method for operating a plant for water jet cutting and installation for water jet cutting|ATA50747/2014A| AT515943B1|2014-10-20|2014-10-20|Method for operating a plant for water jet cutting and installation for water jet cutting|
    ES15190372.1T| ES2662858T3|2014-10-20|2015-10-19|Procedure for operating a water jet cutting installation as well as water jet cutting installation|
    EP15190372.1A| EP3012075B1|2014-10-20|2015-10-19|Method for operating a facility for waterjet cutting and facility for water jet cutting|
    NO15190372A| NO3012075T3|2014-10-20|2015-10-19|
    PL15190372T| PL3012075T3|2014-10-20|2015-10-19|Method for operating a facility for waterjet cutting and facility for water jet cutting|
    HUE15190372A| HUE036924T2|2014-10-20|2015-10-19|Method for operating a facility for waterjet cutting and facility for water jet cutting|
    RS20180303A| RS57018B1|2014-10-20|2015-10-19|Method for operating a facility for waterjet cutting and facility for water jet cutting|
    DK15190372.1T| DK3012075T3|2014-10-20|2015-10-19|Method for operating a facility for waterjet cutting and facility for water jet cutting|
    SI201530200T| SI3012075T1|2014-10-20|2015-10-31|Method for operating a facility for waterjet cutting and facility for water jet cutting|
    HRP20180419TT| HRP20180419T1|2014-10-20|2018-03-09|Method for operating a facility for waterjet cutting and facility for water jet cutting|
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