US20140216708A1 - Cooling Arrangement For Cooling Weld Caps Having A Check Device And Method Of Monitoring - Google Patents

Cooling Arrangement For Cooling Weld Caps Having A Check Device And Method Of Monitoring Download PDF

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Publication number
US20140216708A1
US20140216708A1 US14/170,893 US201414170893A US2014216708A1 US 20140216708 A1 US20140216708 A1 US 20140216708A1 US 201414170893 A US201414170893 A US 201414170893A US 2014216708 A1 US2014216708 A1 US 2014216708A1
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United States
Prior art keywords
cooling arrangement
sensor
check device
cooling
measured values
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US14/170,893
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English (en)
Inventor
Thomas Hamm
Hartmuth Lotha
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Buerkert Werke GmbH and Co KG
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Buerkert Werke GmbH and Co KG
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Filing date
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Assigned to BUERKERT WERKE GMBH reassignment BUERKERT WERKE GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HAMM, THOMAS, LOTHA, HARTMUTH
Publication of US20140216708A1 publication Critical patent/US20140216708A1/en
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/30—Features relating to electrodes
    • B23K11/3054—Cooled electrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • B23K37/003—Cooling means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0028—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for cooling heat generating elements, e.g. for cooling electronic components or electric devices
    • F28D2021/0029—Heat sinks

Definitions

  • the present invention relates to a cooling arrangement for cooling weld caps of a welding device.
  • the invention further relates to a method of monitoring such a cooling arrangement.
  • cooling systems having cooling pipes in which water is used as a coolant, to which glycol and further additives have been added, for example.
  • the cooling pipe is automatically sealed in the region of the weld caps, more precisely at the coolant supply and return lines thereof, to prevent an escape of the pressurized coolant. Since the cooling pipe cannot be sealed instantly in spite of the employment of quick-closing valves, an undesirable splashing of coolant will occur due to the pressure that continues to prevail in the sealed portion of the cooling pipe.
  • EP 1 688 205 A1 discloses a device for cooling weld caps of a welding device, which includes a cooling pipe in which a coolant is kept pressurized when the weld caps are removed.
  • an expansion device that is connected to the cooling pipe, and has an expansion chamber, provides the possibility of an instant pressure reduction within the cooling pipe, so that no coolant under high pressure can escape.
  • a cooling arrangement for cooling weld caps of a welding device includes a local cooling pipe having a feed portion through which coolant can flow to the weld caps, and a return portion through which coolant can flow away from the weld caps.
  • the cooling arrangement further includes at least one sensor arranged at the cooling pipe and at least one actuator arranged at the cooling pipe.
  • the cooling arrangement includes a check device which is connected to the at least one sensor and the at least one actuator.
  • the check device means is arranged in an immediate vicinity of the at least one sensor and/or the at least one actuator and/or the local cooling pipe, and is adapted to receive measured values of the at least one sensor and to check, based on pre-established criteria, whether the measured values are within a predefined desired range.
  • the check device can drive the at least one actuator in a predetermined manner such that the cooling arrangement is placed in a safe condition.
  • the cooling arrangement is intended for an application in automated welding devices (welding robots).
  • the objects to be cooled are weld caps which, in operation, assume very high temperatures.
  • the at least one sensor of the cooling arrangement measures a quantity related to the coolant or to some other component that is critical to the cooling arrangement, such as the flow rate, temperature, or pressure of the coolant.
  • the at least one actuator of the cooling arrangement which is driven directly by the check device when necessary, makes sure that an immediate reaction is caused in case of a problem, so that no excessive damage occurs.
  • the invention is based on the finding that monitoring a cooling arrangement can be carried out considerably more easily and effectively if a separate check device for the cooling arrangement is available directly on-site. In this way, staff is readily enabled to detect an error immediately on the associated cooling arrangement, without an intervention in a superordinate system control being necessary for this.
  • These aspects are of particular importance in the case of welding robots, which have a complex system control that is not readily comprehensible to everyone.
  • the system control and the local cooling arrangements of the welding robots may be part of an overall system control or of a larger cooling system, something which would even aggravate the above-mentioned problems.
  • the at least one actuator may comprise a closing valve for shutting off the cooling pipe and/or a device for pressure reduction in the cooling pipe.
  • Actuation of the shut-off valve allows the coolant flow to be interrupted quickly, which is important especially in the event of a leak of the cooling pipe, to prevent any larger amounts of coolant from escaping in an uncontrolled manner.
  • the pressure in the cooling pipe can be reduced after the cooling pipe is shut off, so that during repair or maintenance works in which an outlet opening for the coolant is necessarily provided, the amount of splashing coolant is kept as low as possible.
  • the device for pressure reduction for an accelerated pressure compensation, it includes an expansion cylinder with a built-in compensating spring and/or a pilot valve.
  • the coolant flows into the expansion cylinder which provides a volume for receiving coolant, the volume expanding under the pressure of the coolant.
  • the compensating spring and/or the pilot valve allow(s) to adjust a backpressure, which can be made use of for damping the expansion movement or preloading it against the spring.
  • the at least one sensor should comprise a flow meter and/or a temperature sensor and a pressure sensor.
  • the flow rate, temperature, and pressure parameters are of utmost importance to a proper operation of the cooling arrangement.
  • the check device is placed on the flow meter or the pressure sensor.
  • a separate holder and an external connecting line to the respective sensor are therefore dispensed with.
  • the check device is preferably adapted such that threshold values can be stored and compared with measured values of the at least one sensor. This means that the check device is independent of a superordinate system control to the greatest possible extent.
  • the threshold values can be entered directly on the check device by keys or the like, preferably interactively in a dialog with instructions on a display of the check device.
  • an evaluation unit of the check device is advantageous which takes into account whether measured values of the at least one sensor are outside of the desired range temporarily or permanently. This allows any temporarily occurring errors to be filtered out, such as pressure peaks which by themselves do not yet require any safety measures to be taken. Also helpful are a more extensive evaluation and display of the point of time of the error and, when there is a plurality of sensors, for which parameters and in which order errors have occurred.
  • the check device is adapted to be connected to a superordinate system control, and such that results of the check of whether the measured values of the at least one sensor are within the predefined desired range can be transmitted to the superordinate system control.
  • the error information may be only logged by the superordinate system control, or else the system control—instead of the check device—then arranges for appropriate safety measures to be carried out.
  • At least two flow meters are connected to the check device so that the flow rate can be monitored at at least two different points.
  • One of the flow meters may be provided inside or outside of the local cooling arrangement, for example at a coolant supply line or a coolant discharge line.
  • An incorporation of such an external flow meter provides the possibility of monitoring the pressure differential.
  • the external flow meter may also be arranged at a local cooling pipe of a different local cooling arrangement, e.g. a different cooling arrangement of the same cooling system or a cooling arrangement for a motor. This allows a more differentiated error assessment and provides an evaluation assistance.
  • the check device should include a display for a continuous display of measured values of the at least one sensor and/or for a display of errors.
  • the cooling arrangement is a prefabricated assembly and includes at least one fastener for mounting the cooling arrangement to a wall or a board. This allows the cooling arrangement to be mounted in a simple and space-saving manner. In addition, transportation and storage are simplified.
  • a method of monitoring a cooling arrangement comprises the steps of:
  • one or more threshold values defining the desired range can be manually stored in the check device.
  • the check device For the filtering of any temporarily occurring errors as already previously mentioned, in its evaluation of the measured values of the sensor(s) the check device should take into account whether the measured values are only temporarily or actually permanently outside of the desired range.
  • the check device at first displays that error which occurred first.
  • the check device distinguishes between whether a minor or a major deviation from the desired range has occurred.
  • a minor error it is then possible to remove the error manually during normal operation of the cooling arrangement, without the cooling arrangement being transferred to a safe condition right away.
  • FIG. 1 shows the structure of a cooling arrangement with a check device according to the invention in a top view
  • FIG. 2 shows the structure from FIG. 1 in a side view.
  • FIGS. 1 and 2 show a local cooling arrangement by way of example, which is suitable in particular for cooling weld caps of a welding device.
  • the cooling arrangement comprises a cooling pipe 10 through which a coolant flows and which can be divided into a feed portion 14 leading from a coolant inlet 12 to the weld caps (not illustrated) to be cooled and a return portion 18 leading from the weld caps to be cooled to a coolant outlet 16 .
  • the cooling pipe 10 should be understood as a local pipe which is only intended for the weld caps to be cooled.
  • the cooling arrangement itself may be part of a larger cooling system including a plurality of local cooling arrangements, for example for a multitude of individual welding robots.
  • a flow meter 20 The components of the cooling arrangement that are to be emphasized are: a flow meter 20 ; a temperature sensor 21 (integrated in the housing of the flow meter 20 here); a closing valve 22 for completely shutting off the coolant flow; a pressure sensor 24 ; a device 26 for reducing the pressure in the cooling pipe 10 (pressure reduction device); a valve 28 for section regulation (section regulating valve), preferably with a hand wheel 30 for manual adjustment of the valve 28 ; a nonreturn valve 32 ; and a special check device 34 .
  • the cited components may, together with the coolant inlet 12 , a connection 36 to a supply line to the weld caps, a connection 38 to a return line from the weld caps, and the coolant outlet 16 , be fitted to a wall or a board as a prefabricated assembly.
  • fasteners are provided, for example in the form of clamps 40 and, where required, a fastening board 42 , which may be arranged in particular in the vicinity of the coolant inlet 12 and the coolant outlet 16 or the connections 36 , 38 .
  • the flow meter 20 with the temperature sensor 21 and, behind them, the closing valve 22 are arranged in the feed portion 14 .
  • the pressure sensor 24 Arranged one behind the other in the return portion 18 are the pressure sensor 24 , the pressure reduction device 26 at a branch-off of the cooling pipe 10 , the section regulating valve 28 , and the nonreturn valve 32 .
  • the check device 34 is placed on the pressure sensor 24 as a unit, but could just as well be placed on the flow meter 20 or be formed as an independent unit. At any rate, the check device 34 is connected to the sensors of the cooling arrangement, i.e.
  • the check device 34 is placed in the immediate vicinity of the other components of the local cooling arrangement.
  • the pressure reduction device 26 allows an immediate pressure reduction to be obtained in the cooling pipe 10 , so that a splashing of the pressurized coolant is avoided to the greatest possible extent.
  • the pressure reduction device 26 may be an expansion cylinder 44 having a pilot valve 46 and a restrictor 48 , as disclosed in EP 1 688 205 A1.
  • a compensating spring which preloads the piston in the expansion cylinder.
  • a pump or an active cylinder, or some other type of suction device may also be used.
  • the flow meter 20 , the temperature sensor 21 and the pressure sensor 24 transmit their measured values to the check device 34 .
  • Stored in the check device 34 are application-specific threshold values which can be adjusted individually and which each define a desired range. The measured values are shown on a display of the check device 34 and updated at specific time intervals.
  • a respective alert is output on the display of the check device 34 , i.e. it is indicated which parameter (flow rate, temperature, pressure, etc.) has fallen below a lower threshold value or has exceeded an upper threshold value.
  • a threshold value constitutes an error and, possibly after a check of further pre-established criteria, is rated as a negative check result.
  • the parameter that left the desired range first is displayed first. In this way, it is usually possible to immediately identify the cause of error on the spot, e.g.: was the temperature too high, the pressure too low, or did a cooling pipe burst?
  • an acoustic alert may also further be output.
  • a first operating mode to be referred to as “autarkic” here—of the check device 34
  • the check device 34 will initiate measures on its own to ensure the safety of the cooling arrangement. More precisely, one or more of the actuators connected to the check device 34 , i.e. here the closing valve 22 and the pressure reduction device 26 , are driven such that the cooling arrangement is placed in a safe condition.
  • the check device 34 causes the closing valve 22 to shut off the cooling pipe 10 in the feed portion 12 to prevent any larger amounts of coolant from escaping in the event of a leakage.
  • the pressure reduction device 26 is activated with an adjustable time delay, so that coolant enclosed under pressure is removed from the cooling pipe 10 and pressure is thereby reduced.
  • activation means that the coolant can flow into a dynamic expansion chamber of the expansion cylinder 44 and displace a piston mounted therein, accompanied by an expansion of the expansion chamber. The movement of the piston is damped to a suitable extent by a backpressure on the other side of the piston, the backpressure being adjusted by the pilot valve 46 and the restrictor 48 or the compensating spring.
  • the check device 34 After removal of the error or errors and acknowledgement of the error message(s) to the check device 34 , the check device 34 then first causes the closing valve 22 to be opened and, after an adjustable time delay, the pressure reduction device 26 to be deactivated.
  • deactivation means that the piston is displaced towards the cooling pipe 10 again by a backpressure that is suitably adjusted by means of the pilot valve 46 and the restrictor 48 or the compensating spring, so that the expansion volume is available again in case it is needed again.
  • a plurality of threshold values (steps) for each parameter may be stored, so as to allow a distinction between a minor and a major deviation from the respective desired range.
  • a special evaluation of the measured values may be provided for, which takes into account whether a falling below or exceeding of a threshold value is only temporary or permanent (filter function). Taking one or more of these measures allows to distinguish between slight and serious errors.
  • the cooling arrangement In the event of a slight error which is not yet rated as a negative check result, the cooling arrangement is not switched off immediately, but (for the time being) only an alert is output. This provides the possibility of manually removing the error during normal operation of the cooling arrangement. For example, when the pressure is slightly too low, the pressure can be slightly increased by adjusting the section regulating valve 28 or, when the temperature of the coolant is slightly too high, the flow rate can be increased to lower the temperature in this way.
  • an error that has been detected is also indicated as an alert output on the display of the check device 34 .
  • the check device 34 will not initiate any measures itself, but will pass the error information in the form of characteristic signals on to a superordinate system control, in particular to the robot control when a welding robot is involved. In this case, the system control then takes appropriate measures to ensure the safety of the cooling arrangement or of the entire system.
  • error information can also be transmitted to the superordinate system control.
  • the system control will not arrange for any specific measures which directly concern the cooling arrangement.
  • a third operating mode is available for the check device 34 , which is to be referred to as “cap replacement” here.
  • the check device 34 will cause the closing valve 22 to shut off the cooling pipe 10 in the feed portion.
  • the pressure reduction device 26 activated after an adjustable time delay makes sure, with the assistance of the compensating spring, if required, that excess coolant is removed from the cooling pipe, so that the pressure therein is reduced.
  • the weld caps can then be replaced, without a splashing of pressurized coolant occurring.
  • the error monitoring of the check device 34 is inactive, which is signaled to the operating staff by the current operating mode being indicated on the display. After completion of the weld cap replacement, first the closing valve 22 is opened again before the pressure reduction device 26 is then deactivated again after an adjustable time delay.
  • At least two flow meters are provided, which are both connected to the check device 34 .
  • the values from both flow meters can then be displayed by the check device 34 with an appropriate reference to the respective flow meter and can be monitored for errors.
  • Such a structure allows a display and monitoring of the pressure differential, which apart from that is carried out as described above.
  • the check device 34 is connected to the actuators and to the superordinate system control by suitable multipolar plug connectors or other suitable interfaces.
  • the electrical connections between the components involved may run directly or indirectly (for example as part of a bus system). Wireless connections (radio) are also feasible.
  • the check device 34 further includes keys for configuration, in particular for a direct input of threshold values, for an acknowledgement of error messages, etc..

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Measuring Fluid Pressure (AREA)
US14/170,893 2013-02-05 2014-02-03 Cooling Arrangement For Cooling Weld Caps Having A Check Device And Method Of Monitoring Abandoned US20140216708A1 (en)

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DE102013101104.7A DE102013101104A1 (de) 2013-02-05 2013-02-05 Kühlanordnung zum Kühlen eines Objekts mit einer Kontrolleinrichtung und Verfahren zur Überwachung einer solchen Kühlanordnung
DE102013101104.7 2013-02-05

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Cited By (5)

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CN106695885A (zh) * 2017-02-10 2017-05-24 旷知智能系统（上海）有限公司 一种焊装机器人用的冷却水供给单元
US20170144245A1 (en) * 2015-11-23 2017-05-25 Buerkert Werke Gmbh Welding cap cooling water control system
US20170173822A1 (en) * 2014-09-05 2017-06-22 Denis Beaupre System and method for determining a status of a valve
CN111037081A (zh) * 2020-01-13 2020-04-21 重庆特博液压机电有限公司 一种焊枪冷却水处理装置
US11103951B2 (en) * 2015-03-17 2021-08-31 Christian Guenther Device for supplying coolant, control system for such a device, and a method for operating such a coolant supply system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020124846B4 (de) 2020-09-23 2024-05-23 Bürkert Werke GmbH & Co. KG Schweißkappen-Kühlwassersteuerung sowie Verfahren zur Steuerung einer Schweißkappen-Kühlwassersteuerung

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US6026838A (en) * 1998-04-02 2000-02-22 Proteus Industries, Inc. Method for detecting opening in fluid flow passageway and shutting off flow in response thereto
US20050016979A1 (en) * 2003-07-23 2005-01-27 Stein Alan E. Method and apparatus to adaptively cool a welding-type system
US20110308259A1 (en) * 2010-06-15 2011-12-22 Wray Daniel X Methods, devices and systems for extraction of thermal energy from a heat conducting metal conduit

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US7004936B2 (en) * 2000-08-09 2006-02-28 Cryocor, Inc. Refrigeration source for a cryoablation catheter
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DE202005001738U1 (de) 2005-02-03 2005-05-04 Bürkert Werke GmbH & Co. KG Vorrichtung zum Kühlen von Schweißkappen
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US6026838A (en) * 1998-04-02 2000-02-22 Proteus Industries, Inc. Method for detecting opening in fluid flow passageway and shutting off flow in response thereto
US20050016979A1 (en) * 2003-07-23 2005-01-27 Stein Alan E. Method and apparatus to adaptively cool a welding-type system
US20110308259A1 (en) * 2010-06-15 2011-12-22 Wray Daniel X Methods, devices and systems for extraction of thermal energy from a heat conducting metal conduit

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170173822A1 (en) * 2014-09-05 2017-06-22 Denis Beaupre System and method for determining a status of a valve
US10500762B2 (en) * 2014-09-05 2019-12-10 Command Alkon Incorporated System and method for determining a status of a valve using an actuator accelerometer and a reference accelerometer
US11103951B2 (en) * 2015-03-17 2021-08-31 Christian Guenther Device for supplying coolant, control system for such a device, and a method for operating such a coolant supply system
US20170144245A1 (en) * 2015-11-23 2017-05-25 Buerkert Werke Gmbh Welding cap cooling water control system
CN107009016A (zh) * 2015-11-23 2017-08-04 比尔克特韦尔克有限公司 焊接帽冷却水控制系统
CN106695885A (zh) * 2017-02-10 2017-05-24 旷知智能系统（上海）有限公司 一种焊装机器人用的冷却水供给单元
CN111037081A (zh) * 2020-01-13 2020-04-21 重庆特博液压机电有限公司 一种焊枪冷却水处理装置

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Owner name: BUERKERT WERKE GMBH, GERMANY

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STCB Information on status: application discontinuation

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