EP0941813A1 - Presswerkzeug und Pressverfahren zum Verpressen von Fittings - Google Patents
Presswerkzeug und Pressverfahren zum Verpressen von Fittings Download PDFInfo
- Publication number
- EP0941813A1 EP0941813A1 EP98124210A EP98124210A EP0941813A1 EP 0941813 A1 EP0941813 A1 EP 0941813A1 EP 98124210 A EP98124210 A EP 98124210A EP 98124210 A EP98124210 A EP 98124210A EP 0941813 A1 EP0941813 A1 EP 0941813A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- press
- pressing
- piston
- jaw
- tool
- 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.)
- Granted
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
- B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
- B25B27/10—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same inserting fittings into hoses
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/28—Means for indicating the position, e.g. end of stroke
- F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
- F15B15/2861—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using magnetic means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/28—Means for indicating the position, e.g. end of stroke
- F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
- F15B15/2869—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using electromagnetic radiation, e.g. radar or microwaves
- F15B15/2876—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using electromagnetic radiation, e.g. radar or microwaves using optical means, e.g. laser
Definitions
- the invention relates to a pressing tool for pressing jaws of different sizes according to the preamble of claim 1 and to a method according to Preamble of claim 9.
- Crimping tools for crimping sleeve-shaped press fittings on pipe ends must ensure that the press jaws always press the fitting properly. For the common fitting diameters there are corresponding ones Press jaws can be inserted into the press tool. Because big ones for pressing Forces are required in various known press tools Hydraulic cylinder used to actuate the press jaws. From US 5 125 324, embodiments are known in which an electric motor is a hydraulic pump drives. The pressurized fluid is used to actuate a Piston, which actuates the press tool or the press jaws, in a hydraulic cylinder guided. Through the one arranged directly on the lifting cylinder device Pump with electric motor creates a compact actuation unit.
- the sleeve In one In the first position range, the sleeve is only in the vicinity of the first sensor. In A second position range is sleeve sections in the vicinity of both sensors. In a third position range, the sleeve is only in the vicinity of the second Sensors. The sleeve and the sensors are now dimensioned or spaced so that the first position range is the moving of the press jaws is assigned before the pressing process. The second position range is that Assigned pressing process and corresponds to reaching the third position range the end of the pressing process.
- This distance sensor can thus be used to switch off the jaw drive be used. It is used to end the pressing process between the Press jaws detected the entry into a predetermined position range. All Press jaw pairs that can be used must therefore have a spacer. After inserting a pair of press jaws, the distance sensor must be included the control of the press device.
- the advantage of one Press jaw position detection has the disadvantage of complex construction the press jaws and the connection effort.
- the invention is based on the object, a safe-acting press tool to find.
- a pressing process with such a pressing tool is intended ensure that the pressing with all usable press jaws is safe is feasible.
- the piston position makes it continuously detectable over a positioning range when pressed together the current piston position of press jaws at least at one point in time can be determined safely. So it doesn't have to go through the positioning beforehand of a presence sensor at which position a presence check is to be carried out. Within the positioning range any piston position can be recorded. Because the Position detection is contact-free or contact-free, there can be no interference occur due to dirty sliding contacts. The at least one The point in time at which the position is to be recorded depends on the actuation process from. When pressing a fitting is preferably when the Limit pressure, immediately before a reset valve is opened, the piston position detected, or forwarded to a controller or comparison unit.
- This position is a measure of the quality of the crimping because of the achieved maximum feed with one, from the press jaw shape and storage, or of press jaw parameters, derivable, narrowest press jaw position is. If the limit pressure is reached before the complete pressing, in this way, a piston position that is not in one predetermined tolerance range. Based on the comparison of the recorded Position with at least a lower limit can affect the quality of the pressing be characterized.
- the result is the comparison is used to control a two-value display.
- a green signal is switched on and / or in the event of incomplete pressing, a red signal is generated switched on.
- a Beep can be provided instead of an ad also a Beep can be provided.
- the press jaws do not require a spacer. Any standard jaws can be used. Of the Pressing process can be carried out independently of the position monitoring be, but the end position detection to control the quality of the Compression serves.
- the position measuring device with the control of the Press tool connected. Then the drive of the fluid pump and / or at least one valve of the fluid line system depending on a detected Position can be controlled.
- the pressing process is preferably carried out when it is reached one of the piston positions required for the complete compression. Thereby there is no need to always build a standard limit pressure.
- a quantity derived from piston positions such as the piston speed or the piston acceleration, used to influence the pressing process become.
- the pressing tools according to the prior art can be used with many different exchangeable press jaws can be used.
- the different Press jaws are for pressing copper and steel fittings with diameters of 12, 15, 18, 22, 28, 35, 42 and 54mm, or for connecting Plastic pipes with diameters of 16, 20, 25, 32mm.
- These standard sizes are also special jaws for connections with diameters known from 76.1, 88.9 and 108mm.
- the press jaws that can be used can have any press diameter.
- Corresponding the respective guidance of the jaw movement and the connection to Piston rod is an assignment between the desired position of the Press jaws when fully pressing and the required piston position to be determined for all press jaws.
- a detection unit is preferably provided which a press jaw characterization, preferably a piston end position or an area for it that can be entered or recorded. This is said to ensure be that the comparison of the recorded piston position always with that for the used press jaws correct position limits.
- the registration unit is connected to the controller or the comparison unit.
- a monitoring device can be provided be when changing the press jaws or when inserting the connecting bolt, requires the identification of the new press jaw to be entered.
- the detection unit is preferably equipped with a sensor device and can therefore use the press jaw, especially its piston end position automatically identify or record.
- the identification must be contactless or contactless, because otherwise due to contamination, oxidation or short circuit faults can occur.
- the sensor device has at least one Hall sensor assigned to the pressing device comprises, based on the magnetic field emanating from the press jaws the press jaws or the corresponding piston end position are identified.
- the detection of a magnetic field property can be pollution or Moisture-dependent malfunctions in the pressing jaw detection excluded become.
- 32 different assignments with little effort
- the possibility is made possible at about five positions of the press jaw provided to use a permanent magnet or assignment magnet.
- the positions for assignment magnets are correspondingly with an inserted press jaw arranged allocation Hall sensors, so that the allocation Hall sensors make the presence of assignment magnets detectable. Due to a larger number of Hall sensors and positions for magnets a larger number of assignments are made possible.
- the pressing tool must assign a piston end position range to each jaw designation in order to be able to compare the current piston position with an area required for complete pressing at the end of the pressing process.
- the table of the pressing tools should be supplemented when new types of pressing jaws appear. It has been shown that the most efficient possible allocation does not start from the detection of the jaw type, but directly from the detection or assignment of the piston end position range. If, as described above, 5 , or 32 assignment classes are provided by means of five magnet positions 2, 32 different piston end position ranges can be defined in the pressing tools. The press jaws to be recognized must then be assigned to one of these 32 classes.
- the lifting cylinder device of the pressing tool is an actuation module that makes large forces available in the piston feed direction and because of the Position measuring device over the entire positioning range any piston positions makes it precisely understandable. Because the cylinder part directly afterwards the fluid pump with drive is arranged, there is a compact structure. The Fluid lines and the at least one valve are in the connection area of the Pump and the cylinder part arranged.
- the drive is preferably a Gearbox connected to the pump and can be adapted to the respective application become.
- the pump drive is preferably an electric motor, its control is connected to the control of the lifting cylinder device. This Control enables the triggering of a desired one via a control connection Sequence of operations.
- To reset the piston part is, preferably in the cylinder part, a restoring element, in particular a restoring spring, arranged. The piston rod is guided out of the cylinder part as an actuator.
- the non-contact or non-contact position measuring device enables preferably a distance measurement between the cylinder part and the Piston part, preferably a Hall sensor and a magnet, or a Position Hall sensor and a position magnet, if applicable Laser interference, or laser diffusion distance sensor and a reflective surface, is arranged or formed on one of the two parts.
- a Hall sensor this is preferably on the cylinder part in the area an end face, in particular on the end face with the pressure fluid supply, attached.
- the magnet or position magnet is arranged on the piston part.
- the Magnetic field strength in the Hall sensor or position Hall sensor that measures it depends on the piston position or the position of the magnet. Means A calibration curve can now assign a piston position to each value of the Hall sensor become.
- the distance measurement with the Hall sensor can be done with inexpensive and small components for most applications of the Hydraulic cylinder can be carried out with sufficient accuracy.
- Laser light reaches the laser interference and the laser diffusion measurement from one end of the cylinder part via a reflection on the piston part again back to the front.
- the piston position is determined from the Phase shift between the outgoing and the reflected on the piston Beam determined.
- the laser diffusion measurement determines the intensity of the light reflected from the piston is used as a measure of the piston position.
- the distance measurements with light are analog measuring devices with high frequency Ultrasound possible, but then problems due to Pressure fluctuations in the pressure fluid can result because of the speed of sound propagation depends on the pressure.
- the laser and Ultrasound systems at least for the time being, are still relatively expensive, making a measurement with a Hall sensor is preferred.
- a read head In addition to the effective distance measurements is the position measuring device With Position readings, especially with an incremental scan, very much widespread and accordingly cheap. To do this, a read head must run along a Be scalable. When measuring the piston position in the cylinder part the read head is preferably due to the required connection cable Cylinder part attached. The scale on the piston or on the Piston rod attached or by this by a motion transmission set in motion. Because the piston rod is in a preferred, compact Execution of the lifting cylinder device is guided through a seal the scale must also be guided through this seal. The read head will then placed on either side of the seal. The scanning takes place optically or inductively. Because inductive scanning on a belt with lines different magnetization is also possible in oil without any problems thus inductive scanning is preferred. Such magnetized measuring tapes are robust and can be pressed into suitable recesses in the piston rod so that the piston rod remains sealable.
- the security of the Press tool can be increased. This applies to this presence check same as for the cheek assignment, because it should be a control that works safely even with heavy soiling and in a damp environment.
- a non-contact measuring sensor must be used, which has a field characteristic makes determinable that with existing and missing press jaw is clearly distinguishable.
- a presence magnet on the cheek be provided by a presence Hall sensor of the pressing tool can be detected. Because even old baking or baking from other manufacturers should be used, but it is advantageous for presence control to use an inductive sensor that detects the presence of a makes any jaw made of metal detectable.
- the fastening bolt is in the locking position. It understands it goes without saying that instead of the Hall sensor, for example, an inductive one Sensor can be used. Because the fastening bolt to the press tool heard, it can be assumed that the pressing tool is always is equipped with a fastening bolt with locking magnets.
- the press tool is preferably only operable when the press jaw is inserted and the fastening bolt is locked. If necessary, however, only the existence the press jaw as a condition for the operability of the press tool provided and an unlocked fastening bolt, leads to an acoustic and / or visual warning signal. If a pressing process despite the warning signal is triggered, the unbraked piston movement can cause damage on the pressing tool. To the reason of such damage for It is advisable to record any warranty or product liability issues without saving secured bolts in a fault memory. Because that Inserting a press jaw without bolts is much less possible than inserting a bolt without press jaw is the presence check regarding the press jaw as a condition for the feasibility of a pressing process safer than checking whether a bolt is inserted or locked.
- a pressing tool with a contactless locking sensor preferably with a locking Hall sensor, is also independent of one Piston position measuring device new and innovative. Capturing the Locking or a security measure has compared to that from the State of the art according to European patent application No. 95810595.9-2306 the advantage that the fastening bolt can move or fall out unintentionally can be excluded.
- a presence sensor there are further advantageous embodiments that above using the press tool with the piston position measuring device have already been described. It should be noted that in addition to the existence the locking sensor and possibly the presence sensor also their use, as described for example below, in Pressing process is new and inventive, especially independent of the Use of piston position detection and / or press jaw assignment.
- a pressing process can be carried out in which the pressing can be carried out safely with all press jaws that can be used.
- the pressing process comprises initialization steps or tests.
- an attendance check is carried out to determine whether a press jaw is inserted or not. If there is no jaw, an acoustic and / or visual notification signal is triggered and the presence check is then carried out again. If the presence control detects that a press jaw is inserted, an assignment detection is carried out after a short delay. If there is no assignment, a standard range or standard values are assigned.
- the pressing tool comprises at least one non-contact locking sensor. If the fastening bolt is not locked or is in the securing position, this is detected by the locking sensor and displayed at least with an acoustic and / or visual warning signal. If necessary, the locking check is repeated until the fastening bolt is locked or secured. After successfully completing these control steps, the press tool is ready to initiate a press process.
- the pressing process is connected with further control steps. To achieve this, and especially the time to reach a pressure value in the Lift cylinder device monitored. When this pressure value is reached, the current piston position is recorded and a reset process for resetting the Actuating piston performed.
- a time control determines whether the Reaching the pressure value required time over a predetermined limit time lies. If this is the case, then an acoustic and / or visual warning signal triggered and preferably a corresponding error code stored. If the detected piston position does not correspond to the assigned assignment Tolerance range is so an acoustic and / or optical Warning signal triggered and preferably a corresponding error code saved.
- FIG. 1 shows a pressing tool 13, in which a handle 14 is connected a housing part 1 is arranged with an electric motor 15.
- the drive shaft 16 of the electric motor 15 is via a bearing and gear arrangement 3 with a Pump shaft 17 connected to a pump 4 shown only hinted.
- a commercially available pump is preferably used.
- the print page the pump 4 is connected to a via a pressure line 18 and a control valve 11 Entry opening 19 can be connected in a first end face 22 of the cylinder part 5.
- In the cylinder part 5 is a piston part 20 of the pressure fluid or hydraulic oil supplied arranged so that it can be advanced from the first end face 22.
- first guide and sealing rings 21 are arranged on the piston part 20 arranged.
- a piston rod 6 is through a passage 24 in the second end face 23 of the cylinder part 5. Second guide and sealing rings 25 around the bushing 24 ensure a tight seal.
- a return spring not shown.
- the reset is triggered by the changeover of the control valve 11.
- the control valve 11 achieves a hydraulic one Control in which the control valve is actuated as soon as the pressure in the Piston part 20 acting pressure fluid exceeds a limit pressure.
- the reset state leads a fluid connection from the inlet opening 19 through the Control valve 11 to a fluid reservoir 9 which in turn via a supply and return line 26 with the second adjoining the second end face 23 Cylinder subspace is connected. Due to the use of the second cylinder subspace As a storage supplement, an extremely small size of the Lift cylinder device with the pump 4 and the fluid guide arrangement guaranteed become.
- a pressure sensor 10 for detecting the Pressure provided on the pressure side of the pump.
- One of the pressure values Press force can be derived. At least it should be during a pressing process maximum pressing pressure or the maximum pressing force are recorded. For press tools according to the state of the art, this maximum pressure value compared with a target value. If the measured pressure value is above the setpoint lies, it is assumed that the pressing has been completed.
- the solutions according to the invention now see in addition to or instead of the pressure detection another position detection, for example with a position measuring device, in particular with a distance sensor 12.
- the distance sensor 12 is a Hall sensor which detects the magnetic field of an Piston part 20 attached magnet 12a detected. As already described, can but other measuring devices can also be used. The arrangement of the Components of a measuring device are made so that the position values are as accurate as possible are detectable.
- the drive motor 15, the gear 3, the pump 4, the fluid line system with the control valve 11, and the cylinder part 5 with the position measuring device and the piston part 20 as compact module.
- Such a module is a lifting cylinder device for the most diverse, in one direction absorbing and in the actuations that can be reset in the other direction. Through the combination of two reciprocating lifting cylinder devices, can optionally also be a force-absorbing actuation in both directions be achieved.
- the pressing tool 13 comprises a controller 2, which is the drive motor 15 can influence, as well as the piston position and / or the Makes the pressure value comparable to at least one setpoint.
- the display 27 signals a respective compared value with each other complete or incomplete pressing or a preselected one Piston position and / or the required specification of the used Pressing tool and / or functional problems.
- the controller 2 is preferred connected to the switch 7, by which a pressing process is triggered.
- a pair of press rollers 28 is attached at the Free end of the piston rod 6, a pair of press rollers 28 is attached.
- the pair of press rollers 28 is guided with a guide block 29 in a straight guide 30.
- the Straight guide 30 is attached to the cylinder part 5 and has in the area of the free End a bore 31 for receiving a mounting bolt one not shown pair of press jaws.
- the press jaws are each about an axis of rotation can be pivoted and have actuating surfaces which bear against the press rollers 28.
- the Actuating surfaces are designed so that the moving forward Press rolls the press jaws by swiveling movements around their axes of rotation in the Area of the workpiece to be pressed, in particular fittings, move together.
- the interior of the cylinder part 5 is from Piston part 20 divided into a pressure area 5a and a reservoir area 5b.
- the piston part 20 is reset by the return spring 20a.
- Of the Pressure area 5a is via a pressure line 18 and a control valve 11 with the Pressure side of the pump 4 connectable.
- the control valve 11 shown has two Positions. In a first position, pressure area 5a is acted upon by pressure fluid. In the second position, the pressure side of the pump with the Reservoir 9 and 5b, or connected to the suction side of the pump 4.
- a hydraulic control becomes the control valve in the sense of a pressure relief valve switched from the first to the second position by means of an overpressure line 18a.
- an analog pressure control could also be via the pressure sensor 10 and the Control 2 take place.
- the pressure value detected by the pressure sensor 10 would have to be used can be compared in the controller 2 with a limit pressure.
- the controller 2 When crossing of the limit pressure, the controller 2 would have to control the valve 11a Change valve position.
- the control valve is 11a also switchable by means of an emergency stop switch 11b.
- the distance sensor 12 is used.
- the distance sensor 12 is a Hall sensor that attaches the magnetic field to the piston part 20 Magnets 12a detected. If necessary, the piston position is about one Sensor 112 detects, which evaluates a signal reflected at the piston part 20, or but the position is determined by a read head 212 of the cylinder part 5 on one Read the scale 212a of the piston rod 6.
- the controller 2 can Process position values according to the respective application and corresponding ones Control signals for the valve control 11a and / or the drive control Deploy 2a.
- a hydraulic control can be used, which, for example, a pressure accumulator and / or a pressure reducing unit as well comprises at least one switching valve.
- the controller 2 enables due to Position detection by the position sensor 12 and the pressure detection by the pressure sensor 10, and the regulation of the feed pressure and in particular any amount of the inflow to the pressure area 5a by means of the hydraulic control Forward movement and positioning of the piston part 20.
- the controller 2 can be controlled correctly via a control connection 2b can be connected to a higher-level control unit.
- a lifting cylinder device according to the invention is in line systems for Bulk material or liquids for the operation of passage and dosing elements or of valves can be used advantageously.
- the pressure-actuated stroke is preferably used for closing used.
- a closing device against reaching a required total amount are adjusted by the lifting cylinder so that the flow cross section is smaller and is closed at the right moment. This is for a quick and still exact dosing advantageous.
- Opening a valve is done by the Letting the pressure fluid flow out of the pressure area 5a and adjusting it of the piston part 20 ensured by the return spring.
- the hydraulic control is then designed so that the fluid is out of current emerge from the pressure area 5a and the return spring 20a returns the piston part 20 can.
- the return spring 20a is designed so that it Valve can close. Valves operated in this way are made in chemical plants Security reasons can be used particularly advantageously.
- 3a and 3b show a connecting part of the pressing tool 13, or one Section of it, with the piston rod 6, the press rollers 28 and the Guide block 29 which is guided in a straight guide 30.
- the straight line 30 is attached to the cylinder part 5 and has the in the region of the free end Bore 31 for receiving a fastening bolt 50 of a press jaw arrangement 51.
- the press jaws are each pivotable about an axis of rotation and have actuating surfaces abutting the press rollers 28.
- the operating areas are designed so that the press rollers moved forward the press jaws by swiveling movements around their axes of rotation in the area of the to be pressed Move fittings together.
- the presence sensor 52 is contactless Measuring presence sensor 52 arranged in the straight guide 30 so that it makes a field characteristic determinable, that of existing and missing Press jaw is clearly distinguishable.
- the presence sensor 52 is preferred an inductive sensor is used to detect the presence of a makes any jaw 51 made of metal detectable.
- the fastening bolt 50 includes a cross handle 50a extending to the pin axis, which when inserting the pin 50 is aligned in a first direction. In this direction one takes Bolt longitudinal groove 50b on a guide pin 53, which is complete inserted bolt lies in an annular groove, so that the fastening bolt is rotatable through 180 ° into a locking position.
- a bolt lock control provides that the fastening bolt 50 is controllable in the locking position is.
- the handle 50a is preferably with a locking magnet 50c provided in the locked state or in the locked position adjoins a locking Hall sensor 54 in the pressing tool 13. If the locking Hall sensor 54 detects a magnet, then the fastening bolt 50 in the locked position. It goes without saying that an inductive sensor is used instead of the Hall sensor, for example can be.
- a contactless measuring sensor device is provided. Because of the captured Assignment can be one necessary for a complete pressing Piston end position, or preferably a range is automatically determined become. The recording must be done contact-free or contactless, otherwise malfunctions occur due to contamination, oxidation or short circuit can.
- a preferred solution provides that the assignment to about five Positions of the press jaw 50 provides the option of an assignment magnet to use. For example, blind holes are made for this purpose.
- the positions for assignment magnets 55 are with an inserted press jaw opposite correspondingly arranged assignment Hall sensors 56, so that the association Hall sensors 56 the presence of association magnets Make 55 detectable. Through a larger number of Hall sensors and positions for magnets can allow a larger number of assignments become.
- the positions for assignment magnets 55 are one press jaw used opposite correspondingly arranged assignment Hall sensors 56, so the allocation Hall sensors 56 the presence make it detectable by assignment magnets 55.
- the allocation Hall sensors 56 the presence make it detectable by assignment magnets 55.
- 4a shows a section through the connection area of a press jaw 51 and by a Hall sensor 56 the interaction of these two elements.
- 4b shows the distribution of the Sensors.
- Fig. 5 illustrates a pressing method for pressing sleeve-shaped Press fittings with a press tool, in which the piston part 20 of the pressure fluid the fluid pump 4 advanced in a cylinder part 5 and after Reaching a limit pressure in the pressure fluid after opening a reset valve is reset by a restoring element 20a, the piston part 20 the clamping movement of at least one via a transmission device Press jaw actuated.
- the pressing tool With an on / off switch, the pressing tool is also used a switch-on step 41 turned on. After that, in an initialization step 42 self, start and service tests performed. Before in a triggering step 43 a pressing process 44 together with the detection of operating parameters can be triggered must be recorded in a repeatable second step whether the press tool is ready to initiate a press cycle.
- a press jaw presence check is carried out 45 carried out until a press jaw is inserted. As long as there is no jaw , an acoustic and / or optical notification signal 45a is triggered or maintained. If a jaw is inserted, after a delay time an assignment detection 46 is carried out to the inserted press jaw assign a piston position tolerance range. If there is a missing Assigned a standard area.
- the release of the triggerability of a pressing process is preferably a Locking check 47 performed to an unsecured fastening bolt trigger at least one warning signal 47a. If necessary, the Locking control repeated until the fastening bolt is locked or secured is.
- the pressing process 44 is associated with further control steps. This will be Reaching, and in particular the time until, a pressure value in the Lift cylinder device monitored. When this pressure value is reached, the current piston position is recorded and a reset process for resetting the Actuating piston performed.
- a time control determines whether the Reaching the pressure value required time over a predetermined limit time lies. If this is the case, it becomes an acoustic and / or optical one Warning signal triggered and preferably a corresponding error code saved. If the detected piston position is not in the the assigned assignment corresponding tolerance range, then an acoustic and / or optical warning signal triggered and preferably a corresponding error code saved.
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Abstract
Description
Bevor ein Presszyklus auslösbar gemacht wird, erfolgt eine Anwesenheitskontrolle, die erfasst, ob eine Pressbacke eingesetzt ist oder nicht. Wenn keine Backe vorhanden ist wird ein akkustisches und/oder optisches Hinweissignal ausgelöst und anschliessend erneut die Anwesenheitskontrolle durchgeführt. Wenn mit der Anwesenheitskontrolle erfasst wird, dass eine Pressbacke engesetzt ist, so wird nach einer kurzen Verzögerungszeit eine Zuordnungs-Erfassung durchgeführt. Dabei wird bei einer fehlenden Zuordnung ein Standardbereich bzw. Standardwerte zugeordnet. Als weitere Kontrolle vor der Freigabe der Auslösbarkeit eines Pressvorganges wird eine Verriegelungskontrolle durchgeführt. Zur Durchführung der Verrigelungskontrolle umfasst das Presswerkzeug mindestens einen berührungslos messenden Verriegelungssensor. Wenn der Befestigungsbolzen nicht verriegelt bzw. in der Sicherungsposition ist, wird dies vom Verriegelungssensor erfasst und zumindest mit einem akkustischen und/oder optischen Warnsignal angezeigt. Gegebenenfalls wird die Verriegelungskontrolle wiederholt bis der Befestigungsbolzen verriegelt bzw. gesichert ist. Nach dem erfolgreichen Durchführen dieser Kontrollschritte ist das Presswerkzeug bereit für das Auslösen eines Pressvorganges.
- Fig. 1
- einen vertikalen Schnitt durch ein Presswerkzeug
- Fig. 2
- eine schematische Darstellung des Fluidsystemes und der Steuerung eines Presswerkzeuges
- Fig. 3a und 3b
- den Anschlussbereich eines Presswerkzeuges mit eingesetzter Pressbacke und gesichertem Befestigungsbolzen
- Fig. 4a, 4b
- eine schematische Darstellung der Backen-Identifizierung
- Fig. 5
- ein Ablaufschema zum Pressverfahren
Claims (10)
- Presswerkzeug (13) zum Festpressen von hülsenförmigen Pressfittings, mit einer Hubzylinder-Vorrichtung, die eine Fluidpumpe (4), einen an diese anschliessend angeordneten Zylinderteil (5) und einen im Zylinderteil (5) vom Druckfluid der Fluidpumpe (4) vorschiebbaren und von einem Rückstellelement (20a) rückstellbaren Kolbenteil (20) umfasst, wobei eine Kolbenstange (6) als Betätigungsorgan zum Bewegen mindestens einer Pressbacke aus dem Zylinderteil (5) geführt ist, dadurch gekennzeichnet, dass die Hubzylinder-Vorrichtung eine berührungslos messende Positions-Messvorrichtung (12, 12a; 112; 212, 212a) umfasst, welche die Kolbenposition über einen Positionierbereich kontinuierlich erfassbar macht.
- Presswerkzeug (13) nach Anspruch 1, dadurch gekennzeichnet, dass die Positions-Messvorrichtung (12, 12a; 112) mindestens einen Hallsensor und ein Magnet, gegebenenfalls aber einen Laserinterferenz-, oder Laserdiffusions-Distanzsensor umfasst.
- Presswerkzeug (13) nach Anspruch 1, dadurch gekennzeichnet, dass die Positions-Messvorrichtung (212) eine Positionsablesung, insbesondere mit einer Inkrement-Abtastung, zwischen dem Zylinderteil (5) und dem Kolbenteil (20) erzielbar macht, wobei ein Massstab (212a) und ein Lesekopf (212) je einem der beiden Teile zugeordnet ist und die Abtastung optisch oder induktiv erfolgt.
- Presswerkzeug (13) nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Positions-Messvorrichtung (12, 12a; 112; 212, 212a) mit einer Steuerung (2) verbunden ist, die erfasste Positionswerte mit vorgegebenen Werten vergleichbar macht und vorzugsweise zumindest eine zweiwertige Anzeige (27) ansteuert, wobei die vorgegebenen Werte vorzugsweise für eine vollständige Verpressung benötigte Positions-Teilbereiche charakterisieren und die Anzeige (27) eine richtige oder fehlerhafte Verpressung anzeigbar macht.
- Presswerkzeug (13) nach Anspruch 4, dadurch gekennzeichnet, dass eine Pressbacken-Erfassungseinheit ausgebildet ist, die eine Pressbacken-Zuordnung erfassbar macht, wobei die Erfassungseinheit mit der Steuerung (2) verbunden ist und das Verwenden der den Pressbacken entsprechenden, vorgegebenen Werte ermöglicht.
- Presswerkzeug (13) nach Anspruch 5, dadurch gekennzeichnet, dass die Pressbacken-Erfassungseinheit Hallsensoren, vorzugsweise fünf Hallsensoren, umfasst, die am Presswerkzeug so angeordnet sind, dass sie einem Kodierungsbereich einer eingesetzten Pressbacke zugewandt sind und im Kodierungsbereich eingesetzte Magneten erfassbar machen.
- Presswerkzeug (13) nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass ein berührungslos messender Anwesenheitssensor zum Durchführen einer Pressbacken-Anwesenheitskontrolle am Presswerkzeug angeordnet ist, wobei der Anwesenheitssensor vorzugsweise ein induktiver Sensor ist, der die Anwesenheit von Metall im Bereich der eingesetzten Pressbacke erfassbar macht.
- Presswerkzeug (13) nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass ein berührungslos messender Verriegelungssensor zum Durchführen einer Verriegelungskontrolle am Presswerkzeug angeordnet ist, wobei der Verriegelungssensor vorzugsweise ein Hallsensor oder gegebenenfalls ein induktiver Sensor ist, der die Verriegelung des Befestigungsbolzens durch die Bestimmung eines Teiles, vorzugsweise eines Magneten, in einer vorbestimmten Lage erfassbar macht.
- Pressverfahren zum Festpressen von hülsenförmigen Pressfittings, unter Verwendung eines Presswerkzeuges (13) nach einem der Ansprüche 1 bis 8, bei dem ein Kolbenteil (20) vom Druckfluid einer Fluidpumpe (4) in einem Zylinderteil (5) vorgeschoben und nach dem Erreichen eines Grenzdruckes im Druckfluid nach dem Öffnen eines Rückstellventiles von einem Rückstellelement (20a) zurückstellt wird, wobei der Kolbenteil (20) über eine Übertragungsvorrichtung die Klemmbewegung mindestens einer Pressbacke betätigt, dadurch gekennzeichnet, dass nach einem lnitialisierungsschritt in einem wiederholbaren zweiten Schritt, bevor ein Presszyklus auslösbar gemacht wird, eine Pressbacken-Anwesenheitskontrolle durchgeführt wird, bis eine Pressbacke eingesetzt ist, und dann nach einer kurzen Verzögerungszeit eine Zuordnungs-Erfassung durchgeführt wird, um der eingesetzten Pressbacke einen Kolbenpositions-Toleranzbereich zuzuordnen sowie als weiterer Kontrollschritt vor der Freigabe der Auslösbarkeit eines Pressvorganges eine Verriegelungskontrolle durchgeführt wird, um bei einem nicht gesicherten Befestigungsbolzen zumindest ein Warnsignal auszulösen.
- Pressverfahren nach Anspruch 9, dadurch gekennzeichnet, dass die Pressbacken-Anwesenheitskontrolle mit einem induktiven Messschritt eine eingesetzte Pressbacke erfasst, die Zuordnungserfassung mit Magnetfeldmessungen mittels Hallsensoren in der Pressbacke eingesetzte Magneten erfasst und daraus eine Zuordnung bestimmt und dass die Verriegelungskontrolle vorzugsweise mit einer Magnetfeldmessung mittels eines Hallsensors den Befestigungsbolzen in seiner gesicherten Lage erkennt.
Priority Applications (1)
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EP19980124210 EP0941813B1 (de) | 1998-03-10 | 1998-12-17 | Presswerkzeug und Pressverfahren zum Verpressen von Fittings |
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EP98104322A EP0941812A1 (de) | 1998-03-10 | 1998-03-10 | Hubzylinder-Vorrichtung mit einer Fluidpumpe und Presswerkzeug damit |
EP98104322 | 1998-03-10 | ||
EP19980124210 EP0941813B1 (de) | 1998-03-10 | 1998-12-17 | Presswerkzeug und Pressverfahren zum Verpressen von Fittings |
Publications (2)
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EP0941813A1 true EP0941813A1 (de) | 1999-09-15 |
EP0941813B1 EP0941813B1 (de) | 2003-10-29 |
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EP19980124210 Expired - Lifetime EP0941813B1 (de) | 1998-03-10 | 1998-12-17 | Presswerkzeug und Pressverfahren zum Verpressen von Fittings |
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US9356540B2 (en) | 2011-02-18 | 2016-05-31 | Novopress GmbH Presen Und Presswerkzeuge & Co. KG | Method for automatically controlling an electrohydraulic pressing tool |
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