EP2722133A2 - Method for operating a motor-actuated manual injection device and manual injection device - Google Patents
Method for operating a motor-actuated manual injection device and manual injection device Download PDFInfo
- Publication number
- EP2722133A2 EP2722133A2 EP14151750.8A EP14151750A EP2722133A2 EP 2722133 A2 EP2722133 A2 EP 2722133A2 EP 14151750 A EP14151750 A EP 14151750A EP 2722133 A2 EP2722133 A2 EP 2722133A2
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- European Patent Office
- Prior art keywords
- pressing
- pressure
- time
- detected
- return
- Prior art date
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- Granted
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000002347 injection Methods 0.000 title description 6
- 239000007924 injection Substances 0.000 title description 6
- 238000003825 pressing Methods 0.000 claims description 126
- 230000006835 compression Effects 0.000 claims description 42
- 238000007906 compression Methods 0.000 claims description 42
- 239000012530 fluid Substances 0.000 claims description 22
- 238000005259 measurement Methods 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 6
- 238000011156 evaluation Methods 0.000 claims description 4
- 238000012423 maintenance Methods 0.000 claims description 4
- 230000003321 amplification Effects 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 230000033764 rhythmic process Effects 0.000 claims description 2
- 230000004913 activation Effects 0.000 claims 1
- 238000009530 blood pressure measurement Methods 0.000 claims 1
- 230000007704 transition Effects 0.000 claims 1
- 238000012795 verification Methods 0.000 claims 1
- 238000011017 operating method Methods 0.000 abstract 1
- 238000006073 displacement reaction Methods 0.000 description 9
- 238000003860 storage Methods 0.000 description 4
- 238000002788 crimping Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
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- 239000013589 supplement Substances 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/16—Control arrangements for fluid-driven presses
- B30B15/166—Electrical control arrangements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
- B21D39/04—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods
- B21D39/048—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods using presses for radially crimping tubular elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
- B21D39/04—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods
-
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/16—Control arrangements for fluid-driven presses
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/04—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for forming connections by deformation, e.g. crimping tool
- H01R43/042—Hand tools for crimping
Definitions
- the invention firstly relates to a method for operating a motor-operated hand-pressing device in which one or more pressing jaws are moved from a starting position into a closed pressing position until a predetermined pressing force has been reached or a predetermined time has elapsed, after which a switch is automatically actuated , For example, by returning a plunger, a pressing jaw release takes place, wherein further the plunger is hydraulically, by means of a hydraulic fluid, is actuated and detected by a pressure sensor, the pressure of the hydraulic fluid.
- the invention also relates to a method for operating a motor-operated hand-pressing device, in which one or more pressing jaws are moved from a starting position to a closed pressing position until a predetermined pressing force is reached or a predetermined time has elapsed, which automatically, for example by return of a pressing piston, a pressing jaw release takes place, wherein furthermore the pressing piston is actuated hydraulically by means of a hydraulic means.
- the invention relates to a motor-driven hand-pressing device, with a fixed part and a moving part, wherein the moving member is moved by a current in a hydraulic cylinder hydraulic piston relative to the fixed part and by means of a return spring in an initial position réellebewegbar, wherein a further pressure sensor is provided that detects the pressure of the hydraulic fluid in the hydraulic cylinder.
- Such methods for operating a pressing device and pressing devices are known. For example, be on the WO 99/19947 directed.
- the result known pressing device is hydraulically driven.
- directly driven by electric motor such pressing devices are known.
- pressing devices are known.
- two compression jaws and only one be provided against a fixed counter-stop to be moved pressing jaw. See, for example US 5,727,417 ,
- a compression device which has a pressure sensor.
- a measured via the pressure sensor pressure of the hydraulic fluid is connected via a further measuring device, which can detect the position of a hydraulic piston, with the position of the hydraulic piston in this Pressure compared.
- the time required for the pressing apparatus to reach the predetermined pressure can also be checked.
- the invention initially has the task, in terms of the method, of providing a method for operating a pressing device, which enables the achievement and maintenance of a certain pressure in a reliable manner in the simplest possible way.
- the experience in procedural and device terms also has the task of specifying an advantageous method for operating a pressing device and an advantageous pressing device.
- a solution to the procedural problem set out above is given in a method in which an assigned position of an actuator acting on the pressing jaws is detected by means of the pressure detected by the pressure sensor.
- a further solution is given in terms of the method in that the achievement of the predetermined pressing force is checked by means of the pressure of the hydraulic fluid sensing pressure sensor.
- the object is achieved in a pressing device, in which is geared to that by means of the pressure sensor, a determination of the piston position is feasible or carried out.
- a first workpiece contact is determined and a path or time mark assigned to this first workpiece contact is detected.
- the workpiece contact can basically be detected by a pressure sensor arranged, for example, in a pressing jaw.
- the workpiece contact can continue, for example, by evaluating the motor current. As soon as there is a significant increase in the motor current, this can be interpreted as a workpiece contact.
- the formation of a pressing device with a pressure sensor also has significance in terms of interrupting the return of the moving part or concretely a hydraulic piston at an intermediate position.
- one or more pressing jaws can be moved from an open starting position into a closed pressing position by a switch actuation until a predetermined pressing force has been reached or a predetermined time has elapsed, after which a pressing jaw release takes place automatically, for example by returning a pressing piston acting on the pressing jaws
- this release can be interrupted before reaching the start position in an intermediate position to start a next pressing operation from such an intermediate position.
- the detection of the position of the pressing jaws acting on the pressing member may subsequently, after pressing, in the course of the release of the pressing jaws, be used to this extent according to the interruption to achieve the intermediate position.
- the addition to the travel, pressure or time measure can be between 0 and 50% of the measure, this bandwidth also including all intermediate values, in particular in 1/10% steps.
- the addition may therefore be between 0 and 40.9% and 0 and 40.8% etc. But also between 0.1 and 50%, 0.2 and 50%, 0.3 and 50% and on the other hand also between 0.1 and 40.9%, 02 and 40.9%, 0.2 and 40.8 % etc. Of these values, 0 to 10% inclusive, in turn, is preferred as indicated.
- an interruption of an intermediate position assigned and determined in the course of the pressing process Distance and / or time and / or pressure measure is recorded or stored, according to which degree the release can be interrupted at the following intermediate Verpressions automatically at the relevant intermediate position.
- the release is not necessarily interrupted in the case of the aforementioned intermediate position even in such a case. But it can be interrupted.
- the pressing device is variably usable, so that it (only) interrupts the release when suitably actuated at the intermediate position. Similar processes can always be carried out starting from the same intermediate position.
- it can be provided in terms of operation technology, which is also explained below, that with regard to the respective interruption at the intermediate position no special operation is required, but if no interruption should take place at the intermediate position, this - more preferably: once - by a special operation of the device can be achieved.
- a special switch operation out, an interruption of the press jaw release at the desired intermediate position, but not otherwise.
- the storage of said measure or measured value always takes place during each pressing process. Regardless of whether the interruption is applied using this measure or not.
- a further possibility for determining the intermediate position is also given by the fact that the time from the workpiece contact to the completion of the compression is measured and the press jaw release after the passage of a measured time corresponding path, since the completion of the compression, is interrupted.
- the interruption is thus (only) time-dependent, whereby due to the given relationships (in the case of return, there is practically no disturbance to be taken into account, so that a certain time since the beginning of the return corresponds quite accurately to a specific piston travel), the path can be readily determined (for example over a factor applied to the measured time ).
- the end of the compression itself will suitably be detected in a conventional manner. For example, due to the pressure drop and / or opening of a return or overload valve. If necessary, also only on the expiry of a certain period of time, for example measured since the beginning of the Verpresszyklus.
- the intermediate position can be stored and, depending on a specific actuation or non-confirmation of the pressing device during the following pressing operations, the return is in each case carried out only up to the intermediate position.
- This can be achieved, for example, by the fact that the interruption at the intermediate position takes place only as long as it is repeated, as a start key of the device remains pressed continuously.
- the start button As soon as the start button is no longer pressed, the device then returns to its original start position.
- the pressed start button can then take place nevertheless a shutdown of the engine, be it the hydraulic motor or the electric motor, after completion of the compression.
- the - further depressed start button then ensures that at the assigned intermediate position, the interruption of the return or the press jaw release takes place.
- the interruption of the return at a desired location has the consequence that the pressing jaws or a movable pressing jaw with fixed counter-stop, only a maximum of such interruption associated, opening, then, when the interruption has occurred.
- This may mean, for example, that a displacement on the same tubing to a further injection point is possible, but the complete removal of the device from the pipe in question is not possible.
- a security aspect is given that the device, for example, can not fall down.
- the travel and / or pressure and / or time measurement is detected according to a freely selected interruption.
- a break occurs (see above-mentioned German patent application 10 2006 026 552 ) can this associated travel and / or pressure and / or time measurement (time about the time that has passed since the completion of the pressing process) are detected and then take place at a next injection process at the same point the interruption automatically. It then only requires, for example by briefly pressing the start button, an initiation of the next pressing process, which then without any other operation is required, automatically ends at the selected intermediate position again. If you want to return to the starting position, you can this is done, for example, by a long press, double-pressing the start key or the like; depending on which "detection" on the device is preset or preprogrammed.
- the displacement and / or pressure and / or time measurement can be detected according to a change in the operating rhythm. This can happen, for example, that up to the desired intermediate position, now starting with the start position (on the "way out” to a - first - pressing), by repeated short-term pressing a start button of the device, the advancement of the biasing member for the dies takes place. As soon as the desired intermediate position has been reached, the start button can be pressed continuously until the compression is completed. Then the start button can be released and the release of the pressing jaws then takes place automatically only up to the intermediate position. Pressing the start button again, whether with constant holding or only short-term operation, the next Verpressrhythmus runs accordingly in the same way.
- a pressure sensor of the hydraulic fluid detected pressure sensor is given a further use of the pressure sensor.
- the check can be carried out in detail, for example, by a comparison between a predetermined minimum pressure value and an actually achieved pressure value. If, for example, the compression should have reached at least a pressure value of 500 bar, this value can be preset as a minimum pressure value and compared with a pressure value reached, for example 600 bar or 650 bar. As long as the difference between the actually achieved pressure value and the predetermined pressure value is positive, such a compression can be considered to be in order.
- such a pressure sensor can also be used to check by means of the pressure detection a desired automatic opening of the return valve.
- a desired automatic opening of the return valve By storing corresponding curves corresponding to a complete pressing operation, the actual setting and function of the automatically opening return valve can be checked for the large pressure drop occurring upon automatic opening of the return valve.
- a corresponding value storage can be used during maintenance work to set the return valve without having to actually perform an actual pressurization.
- the provision of the pressure transmitter can be used to that by setting a pressure threshold, which is below a to be reached for the completion of a press cycle maximum pressure, a stop of the moving member is performed to achieve a pressure maintenance.
- a pressure threshold which is below a to be reached for the completion of a press cycle maximum pressure
- the maximum pressure value would correspond to the release pressure set with respect to the return valve.
- the pressure threshold value is selected correspondingly below the release pressure of the return valve in this case.
- the pumping operation can then be continued.
- the predetermined actuation of the trigger switch can proceed accordingly automatically and take place after expiration of a, optionally freely selectable, period of time from stopping the engine after reaching the pressure threshold.
- a, optionally freely selectable, period of time from stopping the engine after reaching the pressure threshold.
- a current sensor for detecting the motor current and / or a pressure sensor for detecting the hydraulic fluid pressure in the hydraulic cylinder as already described, be provided, wherein by means of the pressure and / or current measurement of the relevant hydraulic fluid pressure is used for evaluation and / or derived therefrom distance measure is used for further determination.
- a - suitably preprogrammed - microcontroller for evaluating the signals supplied by the pressure sensor and / or a current sensor and / or a timer and / or a displacement sensor is provided.
- a pressure sensor i. no displacement sensor and no current sensor, but a timer, or only a current sensor, that is, no displacement sensor and no pressure sensor, but possibly a timer, are provided.
- the pressure sensor may be provided in combination with the current sensor, and a timer.
- an electrical line transmitting the signal of the pressure sensor to a microcontroller is branched and that a branch line is switched unfiltered to an ADC channel of the microcontroller, while the other branch line is provided with an amplification unit and / or a low-pass filter ,
- a pressure prevailing in the hydraulic fluid when a pressing process is activated be measured and compared with a desired value. In this way, it can first be determined whether it is a turning on of the pressing device in a conventional starting position, in which only the bias voltage caused by the return spring, for example (with a certain surcharge) is applied. Or whether it is a reconnection of the pressing device after switching off and pressure, for example, when in the course of a Aufweitvorganges a certain compression pressure over a certain time continuously applied to the workpiece.
- an opening of the return valve is performed in dependence on the determined when switching on the pressure of the hydraulic fluid associated with this switching.
- This procedure is in turn of importance, in particular, in relation to the expansion method already given by way of example. If, on the basis of the comparison with a nominal value, it is ascertained that it is a reconnection under pressure, the desired or predetermined holding time under pressure in the course of the expansion process, for example, has expired at the same time. Thus, with this reconnection then immediately opening the return valve can be performed combined.
- the pressure is measured after switching on the device at regular intervals. For example, at intervals of less than a second. More preferably at intervals of between one and twenty milliseconds.
- the electric motor 2 is operated in the embodiment via stored in an accumulator 7, not shown in detail electrical energy.
- the electric motor 2 will start to run on the operation of the switch 8 back and pumped accordingly by means of the pump 4 from the hydraulic fluid reservoir 3 in the hydraulic cylinder 9 hydraulic fluid, whereupon the hydraulic piston 5 together with the pressing jaw 6 from the in Fig. 1 shown starting position in the in Fig. 2 moved shown pressing position.
- a current sensor may be provided, which detects a current profile over the path of the hydraulic piston 5, as it qualitatively in the FIGS. 10, 11 is shown.
- the Fig. 10 in this case relates to a hydraulic pump of conventional design or the qualitatively quite fundamental course of the current curve.
- the Fig. 11 relates to the course of the current curve in a two-stage hydraulic pump, but not exactly reproduced here, but qualitatively represented. Especially such a two-stage hydraulic pump as that from the EP 0 927 305 B1 is known.
- a very high current pulse is initially detected.
- a practical value is here, for example, at 80 amps.
- This current value decays very quickly with the starting up of the electric motor, to a value which is only slightly above the no-load current of the motor.
- the motor current increases.
- this path value is stored approximately in a memory chip accommodated in the device, which for this purpose has a volatile memory can have.
- the increase in the current curve up to a maximum value is evident. This corresponds to the completion of the compression or the triggering of the return valve, after which the hydraulic pressure correspondingly drops sharply or even the hydraulic pump is switched off automatically.
- the interruption can be carried out, for example, as in the above-mentioned patent application 10 2006 026 552 is explained in detail.
- the relationship between motor current and path, approximately according to Fig. 10 can be stored in a non-volatile memory during the manufacture of the device.
- a storage of this associated path value takes place approximately in a stored in the device memory chip, which may have a volatile memory for this purpose.
- the way value can, for example, by converting the over time detected motor current, since at least up to a first workpiece contact a sufficiently accurate (at least when averaging: linear) relationship between the path of the piston and the (only) required motor current is given. There then takes place an interruption of the return of the hydraulic piston 5 after completion of pressing at this associated way mark S1. The interruption can be carried out, for example, as in the above-mentioned patent application 10 2006 026 552 is explained in detail.
- the relationship between motor current and path, approximately according to Fig. 5 can be stored in a non-volatile memory during the manufacture of the device.
- the relative position between the hydraulic cylinder and the hydraulic piston in the case of a piston device, for example, can be detected.
- the completion of the compression can be detected, for example, by the fact that a, accompanied by the opening of a return valve, strong drop in the motor current, which waste is then used to detect the end of the compression.
- the time that elapses from the workpiece contact to the completion of the pressing is not the same for each pressing, but rather can depend on individual pressing conditions, in particular the pressed materials, the time can additionally or alternatively also be measured, that of the first workpiece contact , as recorded in the manner explained above, passes until the completion of the compression and this time measure then be used accordingly after completion of the compression and elapse of this time measure then trigger the interruption, so that - in the example - the hydraulic piston assumes the desired intermediate position.
- a timer such as in the form of a microchip. In the event that a period of time is to be detected, this timer will start to count at a certain triggering time and then at a certain end time point the time interval thus determined will be detected and stored, for example, in the volatile memory.
- Fig. 2 is the injection condition of the device according to Fig. 1 shown.
- Fig. 3 is the device according to Fig. 1 represented in the retracted then then due to the procedure described intermediate position.
- a device is shown with two pressing jaws.
- a pressure sensor 10 is arranged in a partially schematic view of a pressing device in which a pressure sensor 10 is arranged.
- the pressure sensor is associated with the return channel 11 of the hydraulic fluid disposed over which return passage, the hydraulic fluid flows to the return valve 12 and from there, with the return valve open, in the storage area 13.
- a branch channel 14 is provided, see Fig. 6 , communicates with a receiving channel 15 of the pressure sensor 10.
- the pressure sensor is thus arranged circumferentially offset to the return valve 12 and / or the return channel 11.
- Fig. 7 the quality of the pressure measured by a pressure sensor over the piston stroke during compression is shown qualitatively. This already corresponds to a conversion. Because the actual pressure detection is usually preferred only over time. In principle, however, an additional displacement sensor can also be provided, for example.
- the pressure scale is also designed for very low pressures, for example up to 10 bar, in the illustration.
- the pressure is preferably measured at regular time intervals. In the embodiment, at intervals of five milliseconds.
- Fig. 7 Due to this relationship according to Fig. 7 can also be closed or calculated back to the position of the piston outside a workpiece contact from the measured pressure. This can be exploited, for example, that, by comparing the measured values, that piston position is determined which still corresponds to the linear relationship before a significant pressure increase due to the workpiece contact then occurs. A piston position determined in this way can subsequently be used as an intermediate position or holding position, from which then the next pressing can be started.
- Fig. 8 In reference to Fig. 8 is in basically the same representation (pressure over the way) as in Fig. 7 the qualitative pressure curve is shown at a complete compression.
- the grouting process begins at point A, here assuming a completely receded compression piston. There is first the slight increase in pressure up to the point B, which represents the workpiece contact and the beginning of a significant compression pressure increase. The compression takes place until the point C is reached, specifically according to a first pressure gradient. After reaching point C, the pressing jaws lie on one another, but the triggering pressure at the end of the pressing or opening of the return valve has not yet been reached. It then comes to an increase in the pressure gradient until the point D is reached. At point D, the return valve opens or the compression is stopped and the pressure drops again to point E, whereupon the return of the piston, in the given case up to the point A in turn, then takes place.
- Fig. 9 For clarity, the pressure curve (or a current measured at the pressure sensor) is plotted over time. It is in terms of a typical course for a real compression. Again, the above-mentioned points A, B, C, D and E can basically be distinguished.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Control Of Presses (AREA)
- Press Drives And Press Lines (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Automatic Assembly (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Manipulator (AREA)
Abstract
Description
Die Erfindung betrifft zunächst ein Verfahren zum Betreiben eines motorisch betätigten Hand-Verpressgerätes, bei welchem auf eine Schalterbetätigung hin ein oder mehrere Pressbacken aus einer Startposition eine in geschlossene Verpressposition bewegt werden, bis eine vorgegebene Verpresskraft erreicht ist oder eine vorgegebene Zeit verstrichen ist, wonach selbsttätig, etwa durch Rücklauf eines Presskolbens, eine Pressbackenfreigabe erfolgt, wobei weiter der Presskolben hydraulisch, mittels eines Hydraulikmittels, betätigt wird und mittels eines Drucksensors der Druck des Hydraulikmittels erfasst wird.The invention firstly relates to a method for operating a motor-operated hand-pressing device in which one or more pressing jaws are moved from a starting position into a closed pressing position until a predetermined pressing force has been reached or a predetermined time has elapsed, after which a switch is automatically actuated , For example, by returning a plunger, a pressing jaw release takes place, wherein further the plunger is hydraulically, by means of a hydraulic fluid, is actuated and detected by a pressure sensor, the pressure of the hydraulic fluid.
Darüber hinaus betrifft die Erfindung auch ein Verfahren zum Betreiben eines motorisch betätigten Hand-Verpressgerätes, bei welchem auf eine Schalterbetätigung hin ein oder mehrere Pressbacken aus einer Startposition in eine geschlossene Verpressposition bewegt werden, bis eine vorgegebene Verpresskraft erreicht ist oder eine vorgegebene Zeit verstrichen ist, wonach selbsttätig, etwa durch Rücklauf eines Presskolbens, eine Pressbacken-Freigabe erfolgt, wobei weiter der Presskolben hydraulisch mittels eines Hydraulikmittels betätigt wird.Moreover, the invention also relates to a method for operating a motor-operated hand-pressing device, in which one or more pressing jaws are moved from a starting position to a closed pressing position until a predetermined pressing force is reached or a predetermined time has elapsed, which automatically, for example by return of a pressing piston, a pressing jaw release takes place, wherein furthermore the pressing piston is actuated hydraulically by means of a hydraulic means.
Weiter betrifft die Erfindung ein motorisch betriebenes Hand-Verpressgerät, mit einem Festteil und einem Bewegungsteil, wobei das Bewegungsteil durch einen in einem Hydraulikzylinder laufenden Hydraulikkolben relativ zu dem Festteil bewegt wird und mittels einer Rückstellfeder in eine Ausgangsstellung zurückbewegbar ist, wobei weiter ein Drucksensor vorgesehen ist, der den Druck des Hydraulikmittels in dem Hydraulikzylinder erfasst.Furthermore, the invention relates to a motor-driven hand-pressing device, with a fixed part and a moving part, wherein the moving member is moved by a current in a hydraulic cylinder hydraulic piston relative to the fixed part and by means of a return spring in an initial position zurückbewegbar, wherein a further pressure sensor is provided that detects the pressure of the hydraulic fluid in the hydraulic cylinder.
Derartige Verfahren zum Betreiben eines Verpressgerätes und Verpressgeräte sind bekannt. Beispielsweise sei auf die
Es ist auch bereits vorgeschlagen worden, siehe etwa die nicht vorveröffentlichte deutsche Patentanmeldung
Weiterhin sind schon in verschiedener Hinsicht Maßnahmen vorgeschlagen worden, die eine Überprüfung ermöglichen sollen, ob eine Verpressung tatsächlich durchgeführt wurde. In der
Aus der
Ausgehend von dem vorbeschriebenen Stand der Technik stellt sich die Erfindung in verfahrensmäßiger Hinsicht zunächst die Aufgabe, ein Verfahren zum Betreiben eines Verpressgerätes anzugeben, das in möglichst einfacher Weise die Erreichung und Einhaltung eines bestimmten Verpressdruckes in sicherer Weise ermöglicht. Darüber hinaus stellt sich die Erfahrung in verfahrensmäßiger und vorrichtungsmäßiger Hinsicht auch die Aufgabe, ein vorteilhaftes Verfahren zum Betreiben eines Verpressgerätes und ein vorteilhaftes Verpressgerät anzugeben.Based on the above-described prior art, the invention initially has the task, in terms of the method, of providing a method for operating a pressing device, which enables the achievement and maintenance of a certain pressure in a reliable manner in the simplest possible way. In addition, the experience in procedural and device terms also has the task of specifying an advantageous method for operating a pressing device and an advantageous pressing device.
Eine Lösung der zunächst dargelegten verfahrensmäßigen Aufgabe ist nach einer ersten Lehre der Erfindung bei einem Verfahren gegeben, bei welchem mittels des durch den Drucksensor erfassten Druckes eine zugeordnete Stellung eines die Pressbacken beaufschlagenden Stellgliedes erfasst wird.According to a first teaching of the invention, a solution to the procedural problem set out above is given in a method in which an assigned position of an actuator acting on the pressing jaws is detected by means of the pressure detected by the pressure sensor.
Eine weitere Lösung ist in verfahrensmäßiger Hinsicht dadurch gegeben, dass das Erreichen der vorgegebenen Presskraft mittels des den Druck des Hydraulikmittels erfassenden Drucksensors überprüft wird.A further solution is given in terms of the method in that the achievement of the predetermined pressing force is checked by means of the pressure of the hydraulic fluid sensing pressure sensor.
Gegenständlich ist die Aufgabe bei einem Verpressgerät gelöst, bei welchem darauf abgestellt ist, dass mittels des Drucksensors eine Bestimmung der Kolbenposition durchführbar ist oder durchgeführt ist.Objectively, the object is achieved in a pressing device, in which is geared to that by means of the pressure sensor, a determination of the piston position is feasible or carried out.
Da der Hydraulikmitteldruck aufgrund der Reibung des Kolbens im Zylinder und der Kraft der Rückstellfeder einen in etwa linearen Druckanstieg und Druckabfall auf dem Hin- und Rückweg des Kolbens aufweist, kann hierüber auch mit gewisser Toleranz die tatsächliche Stellung des Kolbens im Zylinder ermittelt werden. Insofern kann ein - über Zeit gemessener - Druckwert in einen Weg-Wert umgerechnet werden und insoweit, wie nachher auch in Bezug auf einen Weg-Wert erläutert, im Hinblick auf die Stellung des Kolbens und damit letztlich der Pressbacken umgerechnet werden oder als Analogwert hierfür herangezogen werden.Since the hydraulic fluid pressure due to the friction of the piston in the cylinder and the force of the return spring has an approximately linear pressure increase and pressure drop on the way back and forth of the piston, the actual position of the piston in the cylinder can be determined hereby also with a certain tolerance. Insofar, a pressure value measured over time can be converted into a Displacement value are converted and insofar as explained below with respect to a path value, with respect to the position of the piston and thus ultimately the pressing jaws are converted or used as analog value for this purpose.
Im Einzelnen sind eine Vielzahl von Möglichkeiten zur konkreten Durchführung gegeben. Vorteilhaft ist zunächst, dass eine erste Werkstückberührung ermittelt wird und eine dieser ersten Werkstückberührung zugeordnete Wegoder Zeitmarke erfasst wird. Die Werkstückberührung kann grundsätzlich durch einen beispielsweise in einer Pressbacke angeordneten Drucksensor erfasst werden. Die Werkstückberührung kann weiter beispielsweise durch Auswertung des Motorstroms erfolgen. Sobald ein signifikanter Anstieg des Motorstromes gegeben ist, kann dies als Werkstückberührung interpretiert werden.In particular, there are a large number of possibilities for concrete implementation. It is advantageous, first, that a first workpiece contact is determined and a path or time mark assigned to this first workpiece contact is detected. The workpiece contact can basically be detected by a pressure sensor arranged, for example, in a pressing jaw. The workpiece contact can continue, for example, by evaluating the motor current. As soon as there is a significant increase in the motor current, this can be interpreted as a workpiece contact.
Die Ausbildung eines Verpressgerätes mit einem Drucksensor hat auch Bedeutung im Hinblick auf eine Unterbrechung des Rücklaufs des Bewegungsteils bzw. konkret eines Hydraulikkolbens an einer Zwischenposition.The formation of a pressing device with a pressure sensor also has significance in terms of interrupting the return of the moving part or concretely a hydraulic piston at an intermediate position.
In bekannter Weise kann durch eine Schalterbetätigung eine oder mehrere Pressbacken aus einer geöffneten Startposition in eine geschlossene Verpressposition bewegt werden, bis eine vorgegebene Verpresskraft erreicht ist oder eine vorgegebene Zeit verstrichen ist, wonach selbsttätig, etwa durch Rücklauf eines die Pressbacken beaufschlagenden Presskolbens, eine PressbackenFreigabe erfolgt, diese Freigabe jedoch vor Erreichen der Startposition in einer Zwischenposition unterbrochen werden kann, um einen nächsten Verpressvorgang von einer solchen Zwischenposition aus zu beginnen.In a known manner, one or more pressing jaws can be moved from an open starting position into a closed pressing position by a switch actuation until a predetermined pressing force has been reached or a predetermined time has elapsed, after which a pressing jaw release takes place automatically, for example by returning a pressing piston acting on the pressing jaws However, this release can be interrupted before reaching the start position in an intermediate position to start a next pressing operation from such an intermediate position.
Die Erfassung der Stellung eines die Pressbacken beaufschlagenden Pressgliedes kann nachfolgend, nach erfolgter Verpressung, im Zuge der Freigabe der Pressbacken, dazu genutzt sein, diesem Maß entsprechend die Unterbrechung zur Erreichung der Zwischenposition erfolgen zu lassen. Geeigneterweise wird man nicht exakt dieselbe Stelle wählen, an der das Gerät durch den Anstieg des Motorstroms, in dem angeführten Beispielsfall, die Werkstückberührung erfasst hat, sondern eine gewisse Zugabe zu diesem so ermittelten Weg-, Druck- oder Zeitmaß vornehmen, um mit Sicherheit eine Zwischenposition zu erreichen, bei welcher der nächste Verpressvorgang ohne Behinderung wieder begonnen werden kann. Ohne Behinderung meint hierbei insbesondere, dass die Pressbacken etwas weiter geöffnet sind als es eigentlich erforderlich wäre.The detection of the position of the pressing jaws acting on the pressing member may subsequently, after pressing, in the course of the release of the pressing jaws, be used to this extent according to the interruption to achieve the intermediate position. Suitably, you will not choose exactly the same place where the device by the increase of the motor current, in the example given, the workpiece touch has detected, but make some addition to this so determined travel, pressure or Zeitmaß to certainly a To reach intermediate position, in which the next grouting without hindrance can be started again. Without hindrance means here in particular that the pressing jaws are a little wider than it would actually be required.
Die Zugabe zu dem Weg-, Druck- oder Zeitmaß kann zwischen 0 und 50 % des Maßes liegen, wobei diese Bandbreite auch sämtliche Zwischenwerte einschließt, und zwar insbesondere in 1/10 % Schritten. Die Zugabe kann also zwischen 0 und 40,9 % und 0 und 40,8 % etc. liegen. Aber auch zwischen 0,1 und 50 %, 0,2 und 50%, 0,3 und 50 % und andererseits auch zwischen 0,1 und 40,9 %, 02 und 40,9 %, 0,2 und 40,8 % etc. Aus diesen Werten ist insbesondere bevorzugt 0 bis 10 % einschließlich wiederum Zwischenwerten wie angegeben.The addition to the travel, pressure or time measure can be between 0 and 50% of the measure, this bandwidth also including all intermediate values, in particular in 1/10% steps. The addition may therefore be between 0 and 40.9% and 0 and 40.8% etc. But also between 0.1 and 50%, 0.2 and 50%, 0.3 and 50% and on the other hand also between 0.1 and 40.9%, 02 and 40.9%, 0.2 and 40.8 % etc. Of these values, 0 to 10% inclusive, in turn, is preferred as indicated.
In praktischen Anwendungsfällen handelt es sich beispielsweise um die Verpressung zwischen Fittings und Rohren mittels einer übergreifenden Verpresshülse. Um so eine dichte Verbindung zwischen zwei aneinanderstoßenden Rohren zu erreichen. Wenn nachfolgend eine Vielzahl von Verpressungen entweder auf demselben Rohrstrang oder bei Rohrsträngen gleicher Nennweite erfolgt, welche jeweils nicht das Verfahren der Pressbacken in die Startposition erfordern, sondern eine Zwischenposition, an welcher die Unterbrechung der Freigabe erfolgt, vorteilhaft ist, kann mit einer wie hier beschriebenen Ausgestaltung sehr rationell gearbeitet werden. Ein weiterer Anwendungsfall ist die Verpressung (Vercrimpung) eines Kabelschuhs.In practical applications, for example, it is the compression between fittings and pipes by means of a cross-pressing sleeve. To achieve a tight connection between two abutting tubes. If subsequently a plurality of crimping takes place either on the same pipe string or in pipe runs of the same nominal diameter, which in each case do not require the method of pressing jaws in the starting position, but an intermediate position at which the interruption of the release is advantageous, can be with a as described here Design be worked very efficiently. Another application is the compression (crimping) of a cable lug.
Hierzu kann im Weiteren vorgesehen sein, dass zu einer Unterbrechung ein der Zwischenposition zugeordnetes und im Zuge des Verpressvorganges ermitteltes Weg- und/oder Zeit- und/oder Druckmaß erfasst bzw. gespeichert wird, zufolge welchen Maßes die Freigabe bei folgenden Verpressvorgängen selbsttätig an der diesbezüglichen Zwischenposition unterbrochen werden kann.For this purpose, it may further be provided that an interruption of an intermediate position assigned and determined in the course of the pressing process Distance and / or time and / or pressure measure is recorded or stored, according to which degree the release can be interrupted at the following intermediate Verpressions automatically at the relevant intermediate position.
Hierbei ist zunächst wesentlich, dass die Freigabe auch in einem solchen Fall nicht zwangsläufig bei der genannten Zwischenposition unterbrochen wird. Wohl aber unterbrochen werden kann. Mit anderen Worten ist hierdurch das Verpressgerät gleichsam variabel benutzbar, so dass es (nur) bei geeigneter Betätigung an der Zwischenposition die Freigabe unterbricht. Gleichartige Vorgänge können so immer von derselben Zwischenposition ausgehend durchgeführt werden. Geeigneterweise kann dabei bedienungstechnisch vorgesehen sein, was nachstehend auch noch weiter erläutert ist, dass im Hinblick auf die jeweilige Unterbrechung an der Zwischenposition keine besondere Betätigung erforderlich ist, wenn aber an der Zwischenposition keine Unterbrechung mehr erfolgen soll, dies - weiter vorzugsweise: einmalig - durch eine besondere Betätigung des Gerätes erreichbar ist. Umgekehrt ist es genauso möglich, dass nur auf eine besondere Bedienung des Gerätes hin, d.h. insbesondere auf eine besondere Schalterbetätigung hin, eine Unterbrechung der Pressbacken-Freigabe an der gewünschten Zwischenposition erfolgt, sonst aber nicht.In this case, it is first of all essential that the release is not necessarily interrupted in the case of the aforementioned intermediate position even in such a case. But it can be interrupted. In other words, as a result, the pressing device is variably usable, so that it (only) interrupts the release when suitably actuated at the intermediate position. Similar processes can always be carried out starting from the same intermediate position. Suitably, it can be provided in terms of operation technology, which is also explained below, that with regard to the respective interruption at the intermediate position no special operation is required, but if no interruption should take place at the intermediate position, this - more preferably: once - by a special operation of the device can be achieved. Conversely, it is equally possible that only for a particular operation of the device, i. In particular, a special switch operation out, an interruption of the press jaw release at the desired intermediate position, but not otherwise.
Bevorzugt ist in diesem Zusammenhang weiter, dass die Speicherung des genannten Maßes bzw. Messwertes immer, bei jedem Verpressvorgang, erfolgt. Unabhängig davon, ob die Unterbrechung unter Nutzung dieses Maßes angewendet wird oder nicht.In this context, it is further preferred that the storage of said measure or measured value always takes place during each pressing process. Regardless of whether the interruption is applied using this measure or not.
Eine weitere Möglichkeit zur Ermittlung der Zwischenposition ist auch dadurch gegeben, dass die Zeit von der Werkstückberührung bis zur Vollendung der Verpressung gemessen wird und die Pressbacken-Freigabe nach Verstreichen eines der gemessenen Zeit entsprechenden Weges, seit Vollendung der Verpressung, unterbrochen wird. Die Unterbrechung erfolgt also (nur) zeitabhängig, wobei aufgrund der gegebenen Zusammenhänge (beim Rücklauf gibt es praktisch keine zu berücksichtigende Störung, so dass eine bestimmte Zeit seit Beginn des Rücklaufs recht genau zu einem bestimmten Kolbenweg korrespondiert) der Weg ohne weiteres bestimmbar ist (bspw. über einen auf die gemessene Zeit angewendeten Faktor).A further possibility for determining the intermediate position is also given by the fact that the time from the workpiece contact to the completion of the compression is measured and the press jaw release after the passage of a measured time corresponding path, since the completion of the compression, is interrupted. The interruption is thus (only) time-dependent, whereby due to the given relationships (in the case of return, there is practically no disturbance to be taken into account, so that a certain time since the beginning of the return corresponds quite accurately to a specific piston travel), the path can be readily determined (for example over a factor applied to the measured time ).
Das Ende der Verpressung selbst wird geeigneterweise in herkömmlicher Weise erfasst werden. Etwa aufgrund des Druckabfalls und/oder auf das Öffnen eines Rücklauf- oder Überlastventils hin. Gegebenenfalls auch lediglich auf den Ablauf einer bestimmten Zeitspanne hin, etwa gemessen seit Beginn des Verpresszyklus.The end of the compression itself will suitably be detected in a conventional manner. For example, due to the pressure drop and / or opening of a return or overload valve. If necessary, also only on the expiry of a certain period of time, for example measured since the beginning of the Verpresszyklus.
Insofern ist es weiter vorteilhaft, dass die Zwischenposition speicherbar ist und in Abhängigkeit einer bestimmten Betätigung bzw. Nicht-Bestätigung des Verpressgerätes bei folgenden Verpressvorgängen der Rücklauf jeweils nur bis zu der Zwischenposition durchgeführt wird. Dies kann dadurch erreicht werden, dass etwa die Unterbrechung an der Zwischenposition nur so lange - wiederholt - erfolgt, wie eine Starttaste des Gerätes durchgehend gedrückt bleibt. Sobald das Drücken der Starttaste nicht mehr gegeben ist, fährt das Gerät dann bis in die ursprüngliche Startposition zurück. Trotz gedrückter Starttaste kann dann gleichwohl eine Abschaltung des Motors, sei es des Hydraulikmotors oder des Elektromotors, nach Vollendung der Verpressung erfolgen. Die - weiter - gedrückte Starttaste sorgt dann dafür, dass an der zugeordneten Zwischenposition die Unterbrechung des Rücklaufs bzw. der Pressbacken-Freigabe erfolgt. Etwa durch kurzzeitiges automatisches Betätigen der Hydraulikpumpe im Falle der Rücklaufunterbrechung gemäß der eingangs genannten deutschen Patentanmeldung
Die Unterbrechung des Rücklaufs an einer gewünschten Stelle hat entsprechend die Folge, dass die Pressbacken oder eine bewegliche Pressbacke mit festem Gegenanschlag, nur maximal ein solches, dieser Unterbrechung zugeordnetes, Öffnungsmaß, dann, wenn die Unterbrechung erfolgt ist, aufweisen. Dies kann etwa bedeuten, dass zwar ein Verschieben auf demselben Rohrstrang zu einer weiteren Verpressstelle möglich ist, das vollkommene Abnehmen des Gerätes von dem betreffenden Rohr aber nicht möglich ist. Insofern ist auch ein Sicherheitsaspekt gegeben, dass das Gerät beispielsweise nicht herunterfallen kann.The interruption of the return at a desired location has the consequence that the pressing jaws or a movable pressing jaw with fixed counter-stop, only a maximum of such interruption associated, opening, then, when the interruption has occurred. This may mean, for example, that a displacement on the same tubing to a further injection point is possible, but the complete removal of the device from the pipe in question is not possible. In this respect, a security aspect is given that the device, for example, can not fall down.
Weiter alternativ kann auch vorgesehen sein, dass das Weg- und/oder Druck- und/oder Zeitmaß zufolge einer freigewählten Unterbrechung erfasst wird. Sobald also, etwa durch kurzzeitiges Antippen der Auslösetaste für einen Verpressvorgang, eine Unterbrechung erfolgt (siehe oben genannte deutsche Patentanmeldung
Weiter alternativ kann auch das Weg- und/oder Druck- und/oder Zeitmaß zufolge einer Änderung im Betätigungsrhythmus erfasst werden. Dies kann etwa dadurch geschehen, dass bis zu der gewünschten Zwischenposition, nunmehr beginnend mit der Startposition (auf dem "Hinweg" zu einer - ersten - Verpressung), durch wiederholtes kurzzeitiges Betätigen eines Startknopfes des Gerätes die Vorbewegung des Beaufschlagungsteils für die Pressbacken erfolgt. Sobald die gewünschte Zwischenposition erreicht ist, kann dann der Startknopf durchgehend gedrückt bleiben bis die Verpressung vollendet ist. Dann kann der Startknopf losgelassen werden und die Freigabe der Pressbacken erfolgt dann selbsttätig nur bis zu der Zwischenposition. Auf erneutes Betätigen des Startknopfes hin, sei es nun bei ständigem Gedrückthalten oder nur kurzzeitiger Betätigung, läuft der nächste Verpressrhythmus entsprechend in gleicher Weise ab.Further alternatively, the displacement and / or pressure and / or time measurement can be detected according to a change in the operating rhythm. This can happen, for example, that up to the desired intermediate position, now starting with the start position (on the "way out" to a - first - pressing), by repeated short-term pressing a start button of the device, the advancement of the biasing member for the dies takes place. As soon as the desired intermediate position has been reached, the start button can be pressed continuously until the compression is completed. Then the start button can be released and the release of the pressing jaws then takes place automatically only up to the intermediate position. Pressing the start button again, whether with constant holding or only short-term operation, the next Verpressrhythmus runs accordingly in the same way.
Hinsichtlich der Einhaltung der vorgegebenen Verpresskraft, durch einen den Druck des Hydraulikmittels erfassenden Drucksensor ist eine weitere Nutzung des Drucksensors gegeben. Die Überprüfung kann im Einzelnen bspw. durch einen Vergleich zwischen einem vorgegebenen Mindestdruckwert und einem tatsächlich erreichten Druckwert durchgeführt werden. Wenn bspw. die Verpressung mindestens einen Druckwert von 500 bar erreicht haben sollte, kann dieser Wert als Mindestdruckwert vorgegeben werden und mit einem erreichten Druckwert, bspw. 600 bar oder 650 bar, verglichen werden. Solange die Differenz zwischen dem tatsächlich erreichten Druckwert und dem vorgegebenen Druckwert positiv ist, kann eine solche Verpressung als in Ordnung gewertet werden.With regard to compliance with the predetermined pressing force, by a pressure sensor of the hydraulic fluid detected pressure sensor is given a further use of the pressure sensor. The check can be carried out in detail, for example, by a comparison between a predetermined minimum pressure value and an actually achieved pressure value. If, for example, the compression should have reached at least a pressure value of 500 bar, this value can be preset as a minimum pressure value and compared with a pressure value reached, for example 600 bar or 650 bar. As long as the difference between the actually achieved pressure value and the predetermined pressure value is positive, such a compression can be considered to be in order.
In weiterer Hinsicht kann ein solcher Drucksensor auch dazu herangezogen werden, mittels der Druckerfassung eine gewünschte selbsttätige Öffnung des Rücklaufventils zu überprüfen. Durch gespeicherte entsprechende Kurven, die einem vollständigen Verpressvorgang entsprechen, kann hinsichtlich des bei automatischem Öffnen des Rücklaufventils eintretenden starken Druckabfalls die tatsächliche Einstellung und Funktion des automatisch öffnenden Rücklaufventils überprüft werden. Insbesondere kann eine entsprechende Wertespeicherung bei Wartungsarbeiten zur Einstellung des Rücklaufventils herangezogen werden, ohne dass eine tatsächliche Druckbeaufschlagung tatsächlich durchgeführt werden muss.In other respects, such a pressure sensor can also be used to check by means of the pressure detection a desired automatic opening of the return valve. By storing corresponding curves corresponding to a complete pressing operation, the actual setting and function of the automatically opening return valve can be checked for the large pressure drop occurring upon automatic opening of the return valve. In particular, a corresponding value storage can be used during maintenance work to set the return valve without having to actually perform an actual pressurization.
In besonderen Fällen, etwa bei Aufweitvorgängen für Rohre, ist es erwünscht, dass ein bestimmter Druckwert, ein Aufweite-Druckwert, über einige Zeit beibehalten wird, ohne dass eine Öffnung des Rücklaufventils erfolgt. Insoweit kann das Vorsehen des Drucksenders dazu genutzt werden, dass mittels Vorgabe eines Druckschwellwertes, der unterhalb eines für die Beendigung eines Presszyklus zu erreichenden Druckmaximalwertes liegt, ein Anhalten des Bewegungsteils durchgeführt wird zur Erzielung einer Druckhaltung. Der Druckmaximalwert würde im Fall des automatisch öffnenden Rücklaufventils dem insoweit bezüglich des Rücklaufventils eingestellten Auslösedrucks entsprechen. Der Druckschwellwert wird entsprechend unterhalb des Auslösedrucks des Rücklaufventils in diesem Fall gewählt. Mit Erreichen des Druckschwellwerts erfolgt dann geeigneterweise eine Abstellung des Motors, welcher die Hydraulikmittelpumpe betätigt. Der Druck wird also gehalten. Durch vorgegebenes oder manuell gewähltes nochmaliges Betätigen des Auslöseschalters kann der Pumpvorgang dann fortgesetzt werden. Das vorgegebene Betätigen des Auslöseschalters kann entsprechend selbsttätig ablaufen und nach Ablauf einer, ggf. frei wählbaren, Zeitspanne ab Abstellen des Motors nach Erreichen des Druckschwellwertes erfolgen. Hierbei kann aber in einer Variante auch sogleich vorgesehen sein, dass bei Erfassen einer nochmaligen Betätigung unter Druck, also bei dem etwa vorgegebenen Druckschwellwert, zugleich mit der nochmaligen Betätigung die Öffnung des Rücklaufventils erfolgt, da dann die für diesen Bearbeitungszweck angestrebte Druckbeaufschlagung erreicht ist und es eines nochmaligen Druckanstiegs bis zum selbsttätigen Öffnen des Rücklaufventils (bei üblichem Zyklus) nicht mehr bedarf.In particular cases, such as tube expansion operations, it is desirable to maintain a certain pressure value, a rupture pressure value, for some time without opening the return valve. In that regard, the provision of the pressure transmitter can be used to that by setting a pressure threshold, which is below a to be reached for the completion of a press cycle maximum pressure, a stop of the moving member is performed to achieve a pressure maintenance. In the case of the automatically opening return valve, the maximum pressure value would correspond to the release pressure set with respect to the return valve. The pressure threshold value is selected correspondingly below the release pressure of the return valve in this case. Upon reaching the pressure threshold then suitably a shutdown of the engine, which actuates the hydraulic fluid pump. The pressure is therefore kept. By predetermined or manually selected repeated actuation of the trigger switch, the pumping operation can then be continued. The predetermined actuation of the trigger switch can proceed accordingly automatically and take place after expiration of a, optionally freely selectable, period of time from stopping the engine after reaching the pressure threshold. In this case, however, it may also be readily provided in a variant that when detecting a repeated actuation below Pressure, so at the approximately predetermined pressure threshold, at the same time with the repeated operation of the opening of the return valve, since then the desired target for this purpose pressurization is reached and it no longer requires a further increase in pressure to the automatic opening of the return valve (in the usual cycle).
In dem Verpressgerät kann ein Stromsensor zur Erfassung des Motorstroms und/oder ein Drucksensor zur Erfassung des Hydraulikmitteldrucks in dem Hydraulikzylinder, wie bereits beschrieben, vorgesehen sein, wobei mittels der Druck- und /oder Strommessung der diesbezügliche Hydraulikmitteldruck zur Auswertung herangezogen wird und / oder ein hiervon abgeleitetes Wegmaß zur weiteren Bestimmung herangezogen wird.In the pressing device, a current sensor for detecting the motor current and / or a pressure sensor for detecting the hydraulic fluid pressure in the hydraulic cylinder, as already described, be provided, wherein by means of the pressure and / or current measurement of the relevant hydraulic fluid pressure is used for evaluation and / or derived therefrom distance measure is used for further determination.
In weiterer bevorzugter Ausführungsform ist vorgesehen, dass ein - geeignet vorprogrammierter - Mikrocontroller zur Auswertung der von dem Drucksensor und / oder einem Stromsensor und / oder einem Zeitmesser und / oder einem Wegsensor gelieferten Signale vorgesehen ist. Bevorzugt ist insbesondere auch, dass nur ein Drucksensor, d.h. kein Wegsensor und kein Stromsensor, wohl aber ein Zeitmesser, oder nur ein Stromsensor, das heißt kein Wegsensor und kein Drucksensor, wohl aber ggf. ein Zeitmesser, vorgesehen sind. Andererseits kann auch insbesondere der Drucksensor mit dem Stromsensor, und einem Zeitmesser, kombiniert vorgesehen sein.In a further preferred embodiment, it is provided that a - suitably preprogrammed - microcontroller for evaluating the signals supplied by the pressure sensor and / or a current sensor and / or a timer and / or a displacement sensor is provided. In particular, it is also preferred that only one pressure sensor, i. no displacement sensor and no current sensor, but a timer, or only a current sensor, that is, no displacement sensor and no pressure sensor, but possibly a timer, are provided. On the other hand, in particular, the pressure sensor may be provided in combination with the current sensor, and a timer.
In weiterer bevorzugter Ausführungsform ist vorgesehen, dass eine das Signal des Drucksensors zu einem Mikrocontroller übermittelnde elektrische Leitung verzweigt ist und dass eine Zweigleitung ungefiltert auf einen ADC-Kanal des Mikrocontrollers geschaltet ist, während die andere Zweigleitung mit einer Verstärkungseinheit und / oder einem Tiefpassfilter versehen ist.In a further preferred embodiment, it is provided that an electrical line transmitting the signal of the pressure sensor to a microcontroller is branched and that a branch line is switched unfiltered to an ADC channel of the microcontroller, while the other branch line is provided with an amplification unit and / or a low-pass filter ,
Bevorzugt ist weiterhin, dass ein bei Einschaltung eines Pressvorganges in dem Hydraulikmittel herrschender Druck gemessen wird und mit einem Sollwert verglichen wird. Hierdurch kann zunächst festgestellt werden, ob es sich um ein Einschalten des Pressgerätes in einer üblichen Ausgangsposition handelt, bei der lediglich der durch die Rückstellfeder beispielsweise verursachte Vorspannungsdruck (mit gewissem Zuschlag) anliegt. Oder ob es sich um ein Wiedereinschalten des Pressgerätes nach einem Ausschalten und Druck handelt, etwa wenn im Zuge eines Aufweitvorganges ein gewisser Verpressdruck über eine gewisse Zeit andauernd auf das Werkstück aufgebracht werden soll.It is furthermore preferred that a pressure prevailing in the hydraulic fluid when a pressing process is activated be measured and compared with a desired value. In this way, it can first be determined whether it is a turning on of the pressing device in a conventional starting position, in which only the bias voltage caused by the return spring, for example (with a certain surcharge) is applied. Or whether it is a reconnection of the pressing device after switching off and pressure, for example, when in the course of a Aufweitvorganges a certain compression pressure over a certain time continuously applied to the workpiece.
In weiter bevorzugter Ausgestaltung kann dann vorgesehen sein, dass in Abhängigkeit des beim Einschalten ermittelten Druckes des Hydraulikmittels zugeordnet diesem Einschalten eine Öffnung des Rücklaufventils durchgeführt wird. Diese Verfahrensweise ist insbesondere wiederum von Bedeutung in Bezug auf das schon beispielhaft angegebene Aufweitverfahren. Wenn aufgrund des Vergleichs mit einem Sollwert festgestellt wird, dass es sich um ein Wiedereinschalten unter Druck handelt, ist mit diesem Wiedereinschalten zugleich auch die gewünschte oder vorgegebene Haltezeit unter Druck im Zuge des - beispielsweise - Aufweitvorganges abgelaufen. Somit kann mit diesem Wiedereinschalten dann sogleich das Öffnen des Rücklaufventils kombiniert durchgeführt werden.In a further preferred embodiment, it can then be provided that an opening of the return valve is performed in dependence on the determined when switching on the pressure of the hydraulic fluid associated with this switching. This procedure is in turn of importance, in particular, in relation to the expansion method already given by way of example. If, on the basis of the comparison with a nominal value, it is ascertained that it is a reconnection under pressure, the desired or predetermined holding time under pressure in the course of the expansion process, for example, has expired at the same time. Thus, with this reconnection then immediately opening the return valve can be performed combined.
Allgemein ist bevorzugt, dass der Druck nach dem Einschalten des Gerätes in regelmäßigen Zeitabständen gemessen wird. Beispielsweise in Zeitabständen von weniger als einer Sekunde. Weiter bevorzugt in Zeitabständen, die zwischen einer und zwanzig Millisekunden liegen.In general, it is preferred that the pressure is measured after switching on the device at regular intervals. For example, at intervals of less than a second. More preferably at intervals of between one and twenty milliseconds.
Nachstehend ist die Erfindung des Weiteren anhand der beigefügten Zeichnung, die jedoch lediglich Ausführungsbeispiele darstellt, erläutert. Hierbei zeigt.
- Fig. 1
- eine teilweise aufgeschnittene Darstellung eines ersten Verpressgerätes mit einer Pressbacke in der Startposition;
- Fig. 2
- eine Darstellung gemäß
Fig. 1 , mit der Pressbacke in der Verpressposition; - Fig. 3
- eine Darstellung gemäß
Fig. 1 bzw.Fig. 2 mit der Verpressbacke in der Zwischenposition; - Fig. 4
- eine Darstellung gemäß
Fig. 1 , jedoch bei einer Ausführung mit zwei Verpressbacken; - Fig. 5
- eine weitere Schnittdarstellung eines entsprechenden Verpressgerätes im Bereich der Pumpe mit angeordnetem Drucksensor;
- Fig. 6
- einen Schnitt durch den Gegenstand gemäß
Fig. 5 , geschnitten entlang der Linie VI - VI; - Fig. 7
- eine schematische Darstellung des Druckverlaufs bei einem Verpresszyklus im Bereich bis zur Werkstückberührung, aufgetragen über den Weg;
- Fig. 8
- eine schematische Darstellung des Druckverlaufs über einen Verpresszyklus, aufgetragen über den Weg;
- Fig. 9
- eine Darstellung gemäß
Fig. 8 , aufgetragen über die Zeit; - Fig. 10
- eine erste schematische Darstellung des Motorstroms bei einer Verpressung, aufgetragen über den Weg;
- Fig. 11
- eine Darstellung gemäß
Fig. 10 , jedoch bei anderen konstruktivem Aufbau der Pumpe.
- Fig. 1
- a partially cutaway view of a first Verpressgerätes with a pressing jaw in the start position;
- Fig. 2
- a representation according to
Fig. 1 , with the pressing jaw in the pressing position; - Fig. 3
- a representation according to
Fig. 1 respectively.Fig. 2 with the compression jaw in the intermediate position; - Fig. 4
- a representation according to
Fig. 1 , but in a version with two compression jaws; - Fig. 5
- a further sectional view of a corresponding Verpressgerätes in the pump with arranged pressure sensor;
- Fig. 6
- a section through the article according to
Fig. 5 , cut along the line VI - VI; - Fig. 7
- a schematic representation of the pressure curve in a Verpresszyklus in the area to the workpiece contact, plotted on the way;
- Fig. 8
- a schematic representation of the pressure curve over a Verpresszyklus, plotted on the way;
- Fig. 9
- a representation according to
Fig. 8 , plotted over time; - Fig. 10
- a first schematic representation of the motor current at a compression, plotted on the way;
- Fig. 11
- a representation according to
Fig. 10 , but with other constructive structure of the pump.
Der Elektromotor 2 wird bei dem Ausführungsbeispiel über in einen im Einzelnen nicht dargestellten Akkumulator 7 gespeicherte elektrische Energie betrieben.The
Mittels eines Startschalters 8 kann der Beginn eines Verpresszyklus ausgelöst werden.By means of a
Bei dem dargestellten Ausführungsbeispiel wird auf die Betätigung des Schalters 8 hin der Elektromotor 2 zu laufen beginnen und entsprechend mittels der Pumpe 4 aus dem Hydraulikmittelvorratsraum 3 in den Hydraulikzylinder 9 Hydraulikmittel gepumpt, woraufhin der Hydraulikkolben 5 zusammen mit der Pressbacke 6 aus der in
In einer weiteren Ausführungsform kann bezüglich des von dem Elektromotor 2 aufgenommenen Stromes ein Stromsensor vorgesehen sein, der einen Stromverlauf über den Weg des Hydraulikkolbens 5 erfasst, wie er qualitativ in den
Die
Zugeordnet dem Anschalten des Gerätes ist in beiden Fällen zunächst ein sehr hoher Stromimpuls zu erkennen. Ein praktischer Wert liegt hier beispielsweise bei 80 Ampere. Dieser Stromwert klingt mit dem Hochlaufen des Elektromotors sehr schnell ab, auf einen Wert, der nur wenig über dem Leerlaufstrom des Motors liegt. Mit Beginn der Werkstückberührung erfolgt prinzipiell ein Anstieg des Motorstromes. Wenn ein gewisser Schwellwert überschritten ist, der in den
Hinsichtlich der Darstellung in
Aber auch im Falle eines qualitativen Verlaufs des Motorstromes entsprechend
Aufgrund des gespeicherten Wertes kann dann eine Unterbrechung des Rücklaufes des Hydraulikkolbens 5 nach vollendeter Verpressung an dieser zugeordneten Wegmarke S1 erfolgen. Im Fall des qualitativen Verlaufs des Motorstromes gemäß
Die Unterbrechung kann beispielsweise so erfolgen, wie dies in der oben genannten Patentanmeldung
Aus Vorstehendem wird auch deutlich, dass in prinzipiell gleicher Weise mit entsprechenden Zeitmaßen gearbeitet werden kann.From the above it is also clear that in principle the same way with corresponding time measurements can be used.
Nachdem hinsichtlich des Anstiegs des Motorstromes ein gewisser Schwellwert überschritten ist, zugeordnet dem in
Für eine Wegmessung kann alternativ oder ergänzend auch die Relativposition zwischen dem Hydraulikzylinder und dem Hydraulikkolben, im Falle eines Kolbengerätes, beispielsweise erfasst werden. Etwa über einen, mehrere (zwei bis vier) oder eine Vielzahl (fünf oder mehr) von Näherungsschaltern, die über die Länge des Hydraulikzylinders in diesem angebracht sind und jeweils die Position des Hydraulikkolbens erfassen können.For a displacement measurement, alternatively or additionally, the relative position between the hydraulic cylinder and the hydraulic piston, in the case of a piston device, for example, can be detected. About one, several (two to four) or a plurality (five or more) of proximity switches, which are mounted on the length of the hydraulic cylinder in this and each can detect the position of the hydraulic piston.
Die Vollendung der Verpressung kann beispielsweise dadurch erkannt werden, dass ein, mit dem Öffnen eines Rücklaufventils einhergehender, starker Abfall des Motorstromes erfolgt, welcher Abfall dann zur Erkennung des Endes der Verpressung herangezogen ist.The completion of the compression can be detected, for example, by the fact that a, accompanied by the opening of a return valve, strong drop in the motor current, which waste is then used to detect the end of the compression.
Da nicht bei jeder Verpressung die Zeit, die von der Werkstückberührung bis zur Vollendung der Verpressung vergeht, gleich ist, diese vielmehr von individuellen Pressbedingungen wie insbesondere den verpressten Werkstoffen abhängen kann, kann zusätzlich oder alternativ auch die Zeit gemessen werden, die von der ersten Werkstückberührung, etwa erfasst in der zuvor erläuterten Weise, vergeht bis zur Vollendung der Verpressung und dieses Zeitmaß dann entsprechend verwendet werden, um nach Vollendung der Verpressung und Verstreichen dieses Zeitmaßes dann die Unterbrechung auszulösen, so dass - im Beispielsfall - der Hydraulikkolben die gewünschte Zwischenposition einnimmt.Since the time that elapses from the workpiece contact to the completion of the pressing is not the same for each pressing, but rather can depend on individual pressing conditions, in particular the pressed materials, the time can additionally or alternatively also be measured, that of the first workpiece contact , as recorded in the manner explained above, passes until the completion of the compression and this time measure then be used accordingly after completion of the compression and elapse of this time measure then trigger the interruption, so that - in the example - the hydraulic piston assumes the desired intermediate position.
Da in demselben Zeitmaß in der Regel beim unbehinderten Rücklauf ein größerer Weg zurückgelegt wird als beim Vorlauf unter Verpressbedingungen, ergibt sich sogleich auch ein in der Regel gewünschtes "Übermaß", um die Unterbrechung bzw. die Pressbacken-Freigabe mit Sicherheit vor der Stellung (der Freigabe-Position der Pressbacken) erreicht zu haben, die minimal erforderlich ist, um die nächste Verpressung durchführen zu können.As in the same time measurement usually in the unobstructed return a greater way is covered than the flow under Verpressbedingungen, immediately results in a usually desired "oversize" to the interruption or the press jaw release with certainty before the position (the Release position of the pressing jaws) reached, which is minimally required in order to carry out the next pressing can.
Hinsichtlich der Zeitmessung kann, etwa auch in Form eines Mikrochips, in dem Gerät ein Zeitmesser vorgesehen sein. Im Falle, dass eine Zeitspanne erfasst werden soll, wird dieser Zeitmesser zu einem bestimmten Auslösezeitpunkt beginnen zu zählen und bei einem bestimmten Endzeitpunkt dann die so ermittelte Zeitspanne erfasst werden und beispielsweise in dem flüchtigen Speicher hinterlegt werden.With regard to the time measurement can be provided in the device, a timer, such as in the form of a microchip. In the event that a period of time is to be detected, this timer will start to count at a certain triggering time and then at a certain end time point the time interval thus determined will be detected and stored, for example, in the volatile memory.
Im Einzelnen etwa dann, wenn die Zeitspanne von der ersten Werkstückberührung (beispielsweise durch Erfassung der kennzeichnenden Erhöhung des Motorstroms) bis zur Vollendung der Verpressung (beispielsweise durch Erfassung des Abfalls des Motorstroms nachdem das Rücklaufventil geöffnet hat) gemessen wird und diese Zeitspanne dann für den Rücklauf des Kolbens (im Falle eines hydraulischen Gerätes) vorgegeben wird bis die Unterbrechung an der hierfür dann ermittelten Zwischenposition erfolgt. Oder in dem die Zeit von der automatischen Abschaltung des Hydraulikmotors nach Vollendung der Verpressung (Ermittlung wie vorstehend ausgeführt) bis zu einem (kurzen) willentlichen Wiedereinschalten zur Unterbrechung des Rücklaufs gemessen wird und danach, im folgenden Zyklus, diese Unterbrechung - nach Ablauf der so gemessenen und danach gespeicherten Zeitspanne - automatisch erfolgt. Diese automatische Unterbrechung kann dann, wie weiter vorne auch schon ausgeführt, so lange bei jedem Zyklus erfolgen, wie eine bestimmte Betätigungsweise, etwa Gedrückthalten des Startknopfes bis die Unterbrechung erfolgt ist, beibehalten wird.Specifically, for example, when the time from the first workpiece contact (for example, by detecting the significant increase in motor current) to the completion of the compression (for example, by detecting the drop in motor current after the return valve has opened) is measured, and then this period of time for the return of the piston (in the case of a hydraulic device) is specified until the interruption takes place at the then determined intermediate position. Or, in which the time from the automatic shutdown of the hydraulic motor after completion of the compression (determination as described above) to a (short) will be voluntarily restarted to interrupt the retrace and then, in the following cycle, this interruption - after the measured so and then stored time - automatically. This automatic interruption can then, as already stated above, be carried out for each cycle as long as a certain mode of operation, such as holding down the start button until the interruption has taken place, is maintained.
Im Allgemeinen kommt es auch nicht darauf an, dass der Rücklauf nach Erreichen eines immer gleichen Maximaldrucks erfolgt. Bei Verwendung eines Wegsensors sind die Presszeiten und Presskräfte nicht wesentlich. Die Steuerung des Druckauf- und -Abbaus kann auch mit Magnetventilen erfolgen.In general, it does not matter that the return takes place after reaching a constant maximum pressure. When using a displacement sensor, the pressing times and pressing forces are not essential. The control of the pressure build-up and disassembly can also be done with solenoid valves.
Andererseits kann, wie einleitend auch schon beschrieben wurde, in diesem Zusammenhang auch mit gewissen (mathematischen) Faktoren, seien sie nun wegverlängernd oder wegverkürzend, gearbeitet werden. Letztere werden sich in der Regel aus empirischen Kenntnissen her ergeben. Aber gleichwohl werksseitig bei Auslieferung des Gerätes vorgegeben sein.On the other hand, as already described in the introduction, certain (mathematical) factors, be they extending the path or shortening the course, can also be used in this context. The latter will usually result from empirical knowledge. But at the same time be factory-set upon delivery of the device.
Da in demselben Zeitmaß in der Regel beim unbehinderten Rücklauf ein größerer Weg zurückgelegt wird als beim Vorlauf unter Verpressbedingungen, ergibt sich sogleich auch ein in der Regel gewünschtes "Übermaß", um die Unterbrechung bzw. die Pressbacken-Freigabe mit Sicherheit vor der Stellung (der Freigabe-Position der Pressbacken) erreicht zu haben, die minimal erforderlich ist, um die nächste Verpressung durchführen zu können.As in the same time measurement usually in the unobstructed return a greater way is covered than the flow under Verpressbedingungen, immediately results in a usually desired "oversize" to the interruption or the press jaw release with certainty before the position (the Release position of the pressing jaws) reached, which is minimally required in order to carry out the next pressing can.
In
In
In
Mit Bezug zu
Mit Bezug zu
Die Kurve ist hier nur bis zu dem Ereignis gezeichnet, dass eine erste signifikante Werkstückberührung und damit Druckerhöhung gegeben ist. Entsprechend ist die Druckskala auch auf sehr niedrige Drücke, etwa bis zu 10 bar, in der Darstellung ausgelegt. Der Druck wird bevorzugt in regelmäßigen zeitlichen Abständen gemessen. Bei der Ausführungsform in Abständen von fünf Millisekunden.The curve is drawn here only up to the event that a first significant workpiece contact and thus pressure increase is given. Accordingly, the pressure scale is also designed for very low pressures, for example up to 10 bar, in the illustration. The pressure is preferably measured at regular time intervals. In the embodiment, at intervals of five milliseconds.
Wesentlich ist, dass sich im Bereich niedriger Drücke bzw. anfänglichen Kolbenweges, bis es zu einer ersten signifikanten Druckerhöhung aufgrund einer Werkstückberührung kommt, ein linearer Verlauf ergibt, der auch bezüglich Hin- und Rücklauf hystereseartig beabstandet ist. Dieser Druckverlauf erklärt sich dadurch, dass die auf den Kolben wirkende Rückholfeder mit zunehmender Komprimierung eine höhere Kraft ausübt. Hierdurch erklärt sich der annähernd lineare Anstieg der Druckkurve, solange es nicht zu einer ersten signifikanten Werkstückberührung kommt. Dadurch, dass weiterhin die Reibung des Kolbens im Zylinder eine Rolle spielt, diese Reibungskraft jedoch je nach Bewegungsrichtung des Kolbens entgegengesetzt wirkt, kommt es zu den unterschiedlichen Kurven beim Vor- und Rücklauf. Die Druckdifferenz liegt im Bereich von 0,5 bis 1 bar.It is essential that in the range of low pressures or initial piston stroke, until there is a first significant pressure increase due to a workpiece contact, a linear course results, which is hysteresis-like spaced also with respect to the return. This pressure profile is explained by the fact that the return spring acting on the piston with increasing Compression exerts a higher force. This explains the approximately linear increase of the pressure curve as long as there is no first significant workpiece contact. The fact that, furthermore, the friction of the piston in the cylinder plays a role, but this frictional force acts opposite depending on the direction of movement of the piston, it comes to the different curves in the flow and return. The pressure difference is in the range of 0.5 to 1 bar.
Aufgrund dieses Zusammenhangs gemäß
Zu Beginn der Bewegung des Presskolbens 5 erfolgt ein Drucksprung von Null auf beispielsweise 4 oder 5 bar. Dieser Drucksprung ist auf die vorzugsweise gegebene Vorspannung der Rückholfeder zurückzuführen.At the beginning of the movement of the
Mit Bezug zu
Der Verpressvorgang beginnt im Punkt A, hier bei unterstellt vollständig zurückgelaufenem Verpresskolben. Es erfolgt zunächst der geringfügige Druckanstieg bis zum Punkt B, welcher die Werkstückberührung und den Beginn einer signifikanten Verpressungs-Druckerhöhung darstellt. Die Verpressung spielt sich bis zum Erreichen des Punktes C ab, und zwar entsprechend einem ersten Druckgradienten. Nach Erreichen des Punktes C liegen die Pressbacken aufeinander, der Auslösedruck zum Ende des Verpressens bzw. Öffnen des Rücklaufventils ist aber noch nicht erreicht. Es kommt dann zu einer Erhöhung des Druckgradienten bis der Punkt D erreicht ist. Im Punkt D öffnet das Rücklaufventil bzw. wird die Verpressung beendet und der Druck fällt wieder ab bis zum Punkt E, woraufhin dann der Rücklauf des Kolbens, im gegebenen Fall bis zu dem Punkt A wiederum, sich vollzieht. Die Erhöhung des Druckgradienten zwischen den Punkten C und D ist darauf zurückzuführen, dass die Verpressung dann - praktisch nur noch - gegen die Steifigkeit des Werkzeugkopfes selbst, eben bei zusammengefahrenen Pressbacken, arbeitet. Diese ist deutlich höher als die Steifigkeit des zu verpressenden Werkstückes (Gradient zwischen B und C).The grouting process begins at point A, here assuming a completely receded compression piston. There is first the slight increase in pressure up to the point B, which represents the workpiece contact and the beginning of a significant compression pressure increase. The compression takes place until the point C is reached, specifically according to a first pressure gradient. After reaching point C, the pressing jaws lie on one another, but the triggering pressure at the end of the pressing or opening of the return valve has not yet been reached. It then comes to an increase in the pressure gradient until the point D is reached. At point D, the return valve opens or the compression is stopped and the pressure drops again to point E, whereupon the return of the piston, in the given case up to the point A in turn, then takes place. The increase in the pressure gradient between the points C and D is due to the fact that the compression then - practically only - against the rigidity of the tool head itself, just when compressed pressing jaws, works. This is significantly higher than the rigidity of the workpiece to be pressed (gradient between B and C).
Dieser Unterschied in den Druckgradienten, jedenfalls nachdem eine erste Werkstückberührung erfolgt ist, die, wie weiter vorne erläutert, auch aufgrund etwa des Drucksensors, auch aber aufgrund des Motorstromes, festgestellt werden kann, kann auch zur weiteren Auswertung herangezogen werden. Nämlich zur Auswertung, ob wirklich eine vollständige Verpressung vorgelegen hat. Dadurch, dass der Druckgradient zwischen C und D, der gleichzeitig auch praktisch eine Werkzeugkonstante darstellt, erreicht wird, ist implizit gegeben, dass die Verpressbacken aneinander anliegen, die Verpressung also stattgefunden hat. Eine nicht vollständige Verpressung kann beispielsweise dann auch zur Auslösung eines Signals, beispielsweise eines akustischen Signals, genutzt sein. Das Signal muss dann weiter beispielsweise durch eine besondere Betätigung gelöscht werden. Weiter kann in dem Verpressgerät als Anzeigemittel auch eine Leuchtdiode vorgesehen sein. Etwa für den Zustand "Verpressung läuft".This difference in the pressure gradient, at least after a first workpiece contact has occurred, which, as explained further above, also due to the pressure sensor, for example, but due to the motor current, can be determined, can also be used for further evaluation. Namely, for the evaluation of whether there really was a complete compression. The fact that the pressure gradient between C and D, which also represents practically a tool constant, is achieved implicitly that the compression jaws abut each other, so the compression has taken place. An incomplete pressing can then also be used, for example, to trigger a signal, for example an acoustic signal. The signal must then be further deleted, for example by a special operation. Furthermore, a light-emitting diode can also be provided in the pressing device as a display means. For example, for the condition "pressing runs".
In
Alle offenbarten Merkmale sind (für sich) erfindungswesentlich. In die Offenbarung der Anmeldung wird hiermit auch der Offenbarungsinhalt der zugehörigen/beigefügten Prioritätsunterlagen (Abschrift der Voranmeldung) vollinhaltlich mit einbezogen, auch zu dem Zweck, Merkmale dieser Unterlagen in Ansprüche vorliegender Anmeldung mit aufzunehmen.All disclosed features are essential to the invention. The disclosure of the associated / attached priority documents (copy of the prior application) is hereby also incorporated in full in the disclosure of the application, also for the purpose of including features of these documents in claims of the present application.
Insbesondere sind in die Offenbarung vorliegender Anmeldung auch die Beschreibung und die Ansprüche der Stammanmeldung (
Claims (15)
Priority Applications (2)
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EP17177348.4A EP3243604B1 (en) | 2007-05-16 | 2008-05-16 | Motor-driven manual pressing device and method for operating a motor-driven manual pressing device |
PL14151750T PL2722133T3 (en) | 2007-05-16 | 2008-05-16 | Method for operating a motor-actuated manual injection device and manual injection device |
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DE102007023068 | 2007-05-16 | ||
EP08759675.5A EP2146823B1 (en) | 2007-05-16 | 2008-05-16 | Method for the operation of a motor-driven hand-held pressing apparatus |
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EP08759675.5A Division EP2146823B1 (en) | 2007-05-16 | 2008-05-16 | Method for the operation of a motor-driven hand-held pressing apparatus |
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EP17177348.4A Division EP3243604B1 (en) | 2007-05-16 | 2008-05-16 | Motor-driven manual pressing device and method for operating a motor-driven manual pressing device |
EP17177348.4A Division-Into EP3243604B1 (en) | 2007-05-16 | 2008-05-16 | Motor-driven manual pressing device and method for operating a motor-driven manual pressing device |
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EP2722133A2 true EP2722133A2 (en) | 2014-04-23 |
EP2722133A3 EP2722133A3 (en) | 2014-09-17 |
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EP17177348.4A Active EP3243604B1 (en) | 2007-05-16 | 2008-05-16 | Motor-driven manual pressing device and method for operating a motor-driven manual pressing device |
EP08759675.5A Active EP2146823B1 (en) | 2007-05-16 | 2008-05-16 | Method for the operation of a motor-driven hand-held pressing apparatus |
EP14151750.8A Active EP2722133B1 (en) | 2007-05-16 | 2008-05-16 | Method for operating a motor-actuated manual injection device and manual injection device |
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EP17177348.4A Active EP3243604B1 (en) | 2007-05-16 | 2008-05-16 | Motor-driven manual pressing device and method for operating a motor-driven manual pressing device |
EP08759675.5A Active EP2146823B1 (en) | 2007-05-16 | 2008-05-16 | Method for the operation of a motor-driven hand-held pressing apparatus |
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US (3) | US8056473B2 (en) |
EP (3) | EP3243604B1 (en) |
KR (1) | KR101467828B1 (en) |
CN (3) | CN102528743B (en) |
AU (1) | AU2008249954B2 (en) |
DE (1) | DE102008024018B4 (en) |
DK (1) | DK2146823T3 (en) |
ES (2) | ES2665902T3 (en) |
PL (2) | PL2146823T3 (en) |
PT (1) | PT2146823E (en) |
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Cited By (1)
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DE102017112481A1 (en) | 2016-10-07 | 2018-04-12 | Gustav Klauke Gmbh | Method for operating a motor-operated hand-pressing device |
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DK2146823T3 (en) * | 2007-05-16 | 2014-05-05 | Klauke Gmbh Gustav | Method of operating a motorized handheld compressor |
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