DD145417A1 - HYDRAULIC TELEMOTOR REVERSING DRIVE - Google Patents

Description

! Pifeel of the invention

Hydraulic Teiemotor reversing drive

Field of application of the invention

The invention relates to a hydraulic telemotor Reirar siebantrieb, at its from a hydro generator, a hydraulic motor and a connecting these connected technical dicJxten piping system closed hydraulic drive a path-dependent controlled and of. an external Druckmittelqueile supplied Nachspeise device for pressure medium and a safety device formed from two acted upon by an external pressure medium source seat valves connected

Characteristic of the known technical solutions

Hydraulic telemotor reversing drives for technologically simple work processes are known »So is from DE-patent specification 1? 52 745 such a hydraulic sr 'Te lemotor Rever si he drive known ,. which carries as a closed hydraulic drive a double-acting deep drawing press with a Antriebskolbeiij on both sides depending on the Antriebszylinder.herausragende piston rod fvx each a drawing punch.j the pressure medium in the closed hydraulic system by a reciprocating driving piston

once against, one _{s is} pressed once against the other side of the drive vault β As with simple. acting deep drawing presses, for Nachspeisung of pressure medium by a make-up cylinder with piston and piston rod 5 of a pump via a check valve under pressure held volume of one side of the piston, another check valve under pressure held volume of one side of the piston through another check valve in As the driving force of the pistons of these Nachspeiszylinder compressed air is provided, \ 'elche by iron the drawing punches way dependent operable switch with the interposition of a Wegevenfciles for each Nachspeiszylinder is separately controllable, each Chamber of the closed hydraulic system is secured with a seat valve ^ which these seat valves for generating the predetermined closing force; * These known hydraulic telemotor reversing drives are associated with several specific disadvantages, the first specific disadvantage is that the required Leckölergäazung is performed only after a faulty stroke on the return stroke of the drive piston «, The cause this is due to the fact that the positional deviation of a certain minimum size is only detected by measuring techniques and then processed by control technology. "

As a second specific disadvantage ₉ proves that the safety device does not ensure the protection of the tool and the machine from damage, the emergency shutdown only; According to human perception manually and set up, the hydraulic motor must be manually carried out to its original position after an accident with great effort "cause

to refer the fact that the safety device according to DE-patent 17 52 745 until the maximum. Working pressure responds, in a blocked by accident hydraulic engine, the hydrogenerator continues under Yerdrängung the oil filling on the seat valves and the analog position of Hydrogen generator and hydraulic motor is lost through an accident »

AIs ^ further specific disadvantage finally proves to be that the known telemotor Reversierantriebe only have to be set in set-fixed fixed stroke position · The reason for this are the Telemotor-Reversieranfcrieben as hydraulic linkage own dependencies of. Delivery and / or intake volume of the hydrogenerator or hydraulic motor and the oil enclosed between them. These specific disadvantages combine to the complex disadvantage that the field of application of the known telemotor reversible drives is narrowly limited. The complex cause is the low Validity in terms of the accuracy, safety and variability that can be achieved

Object of the invention

Bas set object of the invention is _{s s} the scope of the telemotor Heversierantriebes expand significantly · "

Explanation of the essence of the invention

The object of the invention is to provide a hydraulic Telemotor-Revörsieranfcriebj at its from a hydro generator, a hydraulic motor and a connecting them connected technical tight piping closed hydraulic drive a path-dependent controlled and supplied by an external Uruckmitbelquelle Nachspeiseinrichtung for pressure medium and one to two of an external Pressure medium source beauf ™

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hit seat valves formed. Safety device connected to create the dip complex technological requirements of modern machine tool manufacturing and other industries »

According to the invention, the problem is solved by this _? that the ITachspeiseinrichlitung realized by a connected to the pipe system of the closed hydraulic drive position control loop which is coupled with a Eeversiiweg-Lageversteilung with two sta tisch applicable and at least one dynamically variable Sollgeschichtgaben / e and the safety device with a position-dependent pressure control for the application and equipped with a pressure and time-dependent η closing device of the two seat valves'; and a Kotabschalt control is coupled to the LageregelKreis «

It is preferred that a setpoint signal of the position control loop the signals of the setpoint inputs Eeversierweg position adjustment are superimposed, a statically anlegoares setpoint signal is manually adjustable, the second statically applicable setpoint signal voreinstellDai ¹ and periodically invoked and the dynamically variable setpoint signal in dependence technologically predetermined instantaneous position of the working area is controllable in a further embodiment of the invention is preferably provided that the Lageregellcreis has a coupled to the moving element of the hydrogenator setpoint distance measuring system and coupled to the moving element of the hydraulic motor actual Wegnießsystem, wherein the signal output of Actual V / egaießsysi-ems is led directly to an input of a servo amplifier, while the signal output of the setpoint? -Wegmeßsystems is connected to an input of a setpoint ~ summing amplifier whose output a uf the servo amplifier _s which is guided -ausgangsseitlg connected to a servo valve is at its j. Drucio oil connection a hydraulic pressure

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generator and its. Control oil connections are connected directionally to each one line of the Eoirleitungssystems the closed hydraulic drive

Advantageous for the further embodiment of the invention, it is ι that the Reversierweg position adjustment for the realization of statically manually applied setpoint signal is equipped with an adjustable potentiometer whose signal output is passed to an input of Söllwert summing amplifier, for the voreinsteilbar9 and periodically callable setpoint signal an adjustable Potentiometer has whose signal output is guided via a controllable switch to another input of the setpoint-Su ffl Tnierverstärkers and for realizing the current position of the work area analog setpoint signal a location-related analog value is provided whose signal output via a Korrekturverstä ^ ker to a fourth input of A further 'advantage of the invention is that the two seat valves of the safety device of the Druckstromer generator of the position control loop via a branched line, in which a pressure accumulator and a directional control valve are connected, can be acted upon, wherein the line is branched to an adjustable pressure relief valve, soft from a Steuerkurvenabwicklung attached to a moving in synchronism with the path of Beversierbewegung the hydrogenator is, is controllable and the discharge lines of the poppet valves combined to a line and are guided via a check valve and a downstream adjustable throttle valve, and the line between the check valve and the throttle valve is branched off to the Stelleiniieit the directional control valve «

Another advantageous embodiment provides, in another way, for the beidon seat locks to be used for safety purposes.

Direction of the Dr uc & stromer generator of the position control loop-means of a'abrazweigten line, in which. : Accumulator j a directional valve and a. These downstream pressure valve are connected, can be acted upon and the output of the setpoint ¥ egmeßßsysteme the Hydrogenerafcors is applied via a correction amplifier to the control input of the servo-controlled pressure valve and the outflow lines of the seat valves combined into one line and this passed through a check valve and a downstream adjustable throttle valve is, as the line between the check valve and your throttle valve is branched off to the control unit of the directional control valve «

Finally, a preferred embodiment of the invention provides that the output of the servo amplifier übe.2 an absolute value divider is branched off to a first input of an Eomparators ·. At whose second input the maximum permissible Hegelabweichung as reference span- »tion by means of an adjustable potentiometer can be switched on and the output of the Koniparators to a Fotabschalt-control; connected and whose output is connected to the controller of the machine *

Ausführungsheispiel

The invention will be explained in more detail below using an exemplary embodiment ₀ Shown in the accompanying drawing?

FIG. 11 is a schematic representation of the tele-motor reversing drive _$ according to the invention

Figo Zi ausschalttwaise a schematic representation of the lageabhangigeη pressure control using a servo-controlled pressure valve _e

At a crank mechanism 1 according to.? Ig _e 1 a Hydrogenera "tor 2 with its moving element 3 implement coupled 'This Hy & rogeaerator 2 is a technically dense pipe" ·

line system to a hydraulic motor 4 with a moving. Element 5 is connected. ,, In this case, the work chambers separated by the moving element 3 of the hydrogenerator 2 are each connected via a line 6; 7 & eQ piping systems each with a working chamber of the hydraulic motor

4'connected * With the moving element 3 Q-es Hydrogenera

sector 2 is a setpoint distance measuring system 8 mechanically verbuß.den _? while with the moving element 5 of the hydraulic motor'4 an actual value WegmelSsystem. 9 is mechanically connected * The signal output of Jstwert-Wegmeßsystems 9 is fed directly to an input of a servo amplifier 10, while the signal output of the setpoint distance measuring system 8 is guided to an input of a setpoint summing amplifier 11, the output to a second input of the servo amplifier 10th ₀ is connected The servo amplifier 10 has its output connected to a servo valve 12 «. To the Druckölanschluü the servo valve 12, a hydraulic Druckstromerζenger 13 is connected and the control oil connections of the servo valve 12 by means of lines 14} 15 directionally saturated with one of the lines 6; 7 & it closed. Furthermore, in each of the lines 6; 7 a seat valve I65 I7 connected in parallel to the hydraulic motor 4, wherein the application of the closing pressure of the poppet valves I65 1 '/ via a branched off from the pressure generator 13 of the Lagerogelkreises line 18, in which a pressure accumulator 19 and a directional control valve 20 are connected _? The line 18 is branched off to an adjustable pressure relief valve 21 whose adjustment mechanism is controllable via a swinging lever 22 from a cam 23 circulating with the crank drive 1. The outflow lines of the seat valves 16, 17 are combined to form a line 24 a check valve 25 and a nachgoschal -'tetes adjustable throttle valve 26 is guided., Between the check valve 25 and the adjustable throttle valve 25, the line 24 is branched off and connected to the control unit 2 of the directional control valve 20 »

The travel-dependent pressure setting for the poppet valves Ί6 {17 may be different when using a type of drive other than a crank drive 1 in accordance with Pig. 2 takes place »Here, over the directional control valve 20 guided line i8, waiving the adjustable pressure relief valve 21 _s connected upstream of a servo-controlled Dru-Gkventiles 28 to the seat valves 16 $ 17 To obtain the control signals for the servo-controlled pressure valve 28 is the signal output of the desired value ^ Wegmeßsysteiäs 8 to a correction amplifier 2 $ diverted, the output of the servo-controlled pressure valve 28 abliegto

According to Pig · 1 the signal output of the servo amplifier is

10 is branched off to a first input of a comparator 31 via an absolute value generator 41, which has an output side of an ETo tabs and whose output 32 is switched to * the output of this emergency shutdown control 32 is connected to the controller of the machine (not shown) the second input of the comparator y is the signal output of an adjustable potentiometer 30 © In [realization of the Seversierv / eg position adjustment is provided by a Haad adjustable potentiometer 34- whose signal output is fed to a second input of the SoIlwert-Suismierverstärkers 11 For the execution periodisch'auf call barer presettable Reversierweg position adjustments provides an adjustable potentiometer 35 * is connected via © Inen.ansteuerbaren Schalter.36 to a third input of the Sollwerfc summing amplifier 11. Finally, to adapt the position of the Reversierweges to the current Work area a position-related analog value transmitter 37 with a cam 38 in Wirkverbindungjs which is arranged for example on a bed carriage 39 of a machine «. The signal output of the analogue transmitter 37 is fed to the input of a correction corrector 40 _. whose. Output to a fourth input of the setpoint amplifier

11 connected isfe _f which has a Aussteuerbegrenzung «.

The operation of the telemotor, Reversierantriebes invention is the following

Yon the An.triebseinrichtung 33 of the crank mechanism 1 is driven} in turn, the moving element 3 of the hydrogenator 2 reciprocated on a thus determined distance in this movement process from the hydrogenerator 2 displaced oil volume gives the moving element 5 cLes hydraulic motor 4 a reversing movement with a certain · Eevsierweg whose size of the displaced oil volume of the hydrogenator 2 and the cross-sectional area of the cylinder space in which the moving element $ of the hydraulic motor 4 · is included, dependent The hydraulic motor 4 is designed so that its moving element has a maximum Gesamtthubbereich, which is "from the maximum Eeversierweg and after both Eichtungen maximum possible positional adjustment of the Reversierweges · Between the Hydrogenerafeor 2 and the hydraulic motor 4 is on the closed piping system with the lines 65 7 a fixed way relationship _o example e in the movement of the moving element 5 of the hydraulic motor-4 to the left, the right Zylinderräume.er of Hydrogenerator 2 and hydraulic motor 4- and the line 7 are under pressure, disturbed this Wegbeziehung by leak oil attack, so that the moving element 5 of the hydraulic motor 4th Relative to the moving element 3 of the hydrogenerator 2, this deviation from the instantaneous desired position is signaled by the output signal of the actual word distance measuring system 9 to the servo amplifier 10. Based on the comparison with the applied nominal value signal of the setpoint Suminierver amplifier 11 the servo amplifier 10 outputs a signal to the servo valve 12, which is directionally controlled. the Druckstromexseuger I3 promoted pressure oil via dia line 15> in the line 7 «This.zusätzliche 'oil volume gives the moving element 5, a higher speed. enabling the convergence and achieving the desired position, "In this process, the signal of the actual value · approaches - * & ^r £ i <wr.irtP.c ti ⁱ r j-h /: i7T) GO Λϋπι CI" ί ο "s 'i η 1 Άc c. P, C ₁ Ί 1 -νη irhw-W-jγγρια R cjttc; + -, -. crr: α Ά

my? and more _? whereby the servo valve 12 is guided into its closing position until it is closed when the setpoint signal and the actual output signal coincide. This described positional control takes place analogously with the introduction of additional pressurized oil via line 14 $, if in the one from the left Cylinder spaces of the hydrogene «. During the working movement of the hydraulic motor 4, the poppet valves 16j 17 connected in the closed hydraulic drive are acted upon by the pressure oil of the pressure flow generator 13 via the line 18 and thus kept in closed position. The doing on the seat valves 15; 17 acting pressure is from the connected to the line 18 adjustable pressure relief valve 21 by means of the rocker arm 22 and with the. Flywheel of the crank mechanism 1 revolving control »curve 23 depending on position« This ensures that the working pressure is limited to the height required for the correct functioning of the drive on the entire path of the reversing movement of the moving element 5 ctes hydraulic motor 4 * When an accident occurs For example, when using the telemotor Eeversierantriebes invention to a deep-drawing s s by erroneously feeding the semi-finished product to be machined, the moving element 5 cLes hydraulic motor 4 "is already blocked outside the ÜUefziehbereichea causes the rising working pressure already slightly above that for moving the machine tappet required Bruekhöhe the opening of the loaded Sitzventilesj, for example, when moving the moving element 3 to the left the poppet valve 17o The oil displaced via the poppet valve .17 oil is arranged on the arranged in the line 24 · check valve 25 and da s adjustable throttle valve 26 derived case forms before the-throttle valve 26 is a dynamic pressure from the "on the actuator 2? of the directional valve

20 acts and this switches into its controllable Schalfestellung, "Thus, the Sitaventile 16 $ 17 'from Sclaließdruck completely relieved © By blocking the moving. Element 5 cLqs hydraulic motor 4 occurs simultaneously with the explained. Response of the safety device with the further movement of the moving. Element 3 of the hydrogenerator 2 progressively increasing difference of the signals from setpoint and actual value Wegnießsystem 8 | 9, which is connected as a control deviation νοώ output of the servo amplifier 10 to the servo valve 12 and this stimulates to maximum modulation »increases this equilibrium on the magnitude generator 41 at the comparator 31 applied control deviation of the servo amplifier 1ß> on the voltage applied to the second input of the comparator 31 from the adjustable potentiometer 30 provided reference value for the maximum Aussteuer _% then the output of the Komparrttors y \ a signal on the iiotabschalt-control 32 outj the output side with its shutdown signal, the control dor machine disconnected from the network »Thus, the crank mechanism 1 and the Druckstroiaerzeuger 13th brought to a standstill In this state, the vox * of the throttle 26 degrades existing dynamic pressure _? so that the directional control valve 20 in. Its initial position and thus the Sitaventile 16; 17 can be recharged "S-teuerungstechnisch is ensured that j after the elimination of the causes, for the accident, the pressure generator 13 and the position control loop of Rever sierantriebes back on. Voltage can be set and thus come into function * Since the accident occurred the analogous position of'bewegten element 5 from the hydraulic motor 4 to the moving element 3 of the Hydrogenera- 'sector 2 no longer exists "d" h _ey that the stroke position of the hydraulic motor one gaas is different, is on the servo amplifier 10 a corresponding 'setpoint-actual Differana of the setpoint - and don Xstwert ^ WograoBsystera S; 9 an ,? which causes the output of the servo valve 12 and consequently the flow of oil conveyed by the pressure flow unit 13

the moving element 5 shifts so far ^ until the setpoint-actual value difference has become 0 and thus the servo valve 12 is closed ", in this way the automatic adjustment of the original stroke position after an accident is ensured"

The in Figo. 2 realized in another way pressure control for the actuation of the poppet valves 16} 17 is activated in dependence on the current position of the moving element 3 of the hydro-generator 2 by means of the signal output by the Söllwert-Wegmeßsystem 8 This switched to the correction amplifier position-dependent signal activates the associated Control signal of a predetermined voltage curve β This control signal, output by the correction amplifier 29, causes the corresponding pressure setting on the servo-controlled pressure valve 28,

The following explanations on the mode of action are dealt with as an example in the use of the TeIemotor ~ EeversierantrIebes on a Zahnflankenschleifaaschine * Pur the grinding of tooth flanks, especially in helical teeth, starting from the basic setting of the stroke position of the tool, additional periodic and steady changes in the stroke position Required The basic setting of the lifting position is carried out by switching the machine control to set-up mode, as described above for restoring the original position to the lifting position after the accident · The salient element 3 & it Hydrogenerator 2 is preferably one of its dead center positions * Now it is by hand the adjustable potentiometer 3 ^ is actuated, the signal of which is summed in the setpoint summing amplifier 11 ', depending on the sign, with the signal of the setpoint value ~ = position measuring system 8 and fed to the servo amplifier 10 as a superimposed setpoint signal. The control deviation produced as-output causes the steering valve to control the servo valve 12, whereby the in

the. closed hydraulic drive inflowing oil horsepower of the pressure generator 13 shifts the moving element 5 of the hydraulic motor 4 in the sighting direction to the predetermined workpiece-related dead center; "· In this way follows the moving element? 5 of the hydraulic motor 4 of the adjustment of the potentiometer 3 ² U ' ⁰ ^ -S the workpiece-related fofcpuaki; © When grinding tooth flanks in a single-part process, it is still necessary ^ to extend the grinding tool out of the tooth gap after machining one tooth flank and insert it into the next tooth gap * This operation is made possible by the potentiometer 35 preset to the corresponding value With the completion of the processing of a tooth flank, the switch 36 is actuated, and thus the output signal of the potentiometer 35 is fed to the setpoint / absolute summing amplifier 11. The output signal of the setpoint summing amplifier 11 generated at the output causes a control deviation at the output of the servo amplifier 10 Control of the servo valve 12 and thus in the manner described to change dor stroke position of the moving element 5 led If after the (direction finding of the gear to be machined, the new tooth gap in the working area of the grinding tool is -j separates the switch 36, the potentiometer 35 from the target Value ~ 8iimmierverstärkexv 11 and the moving element 5 of the hydraulic motor 4 is in the original Hublage'Kuruckgeregelt * When "the processing of helical gearing is required for rational processing ^ synchronously with the progression of the Abwälabewegung the tooth flank, the stroke position, the tool to change _o This change is achieved by transferring the lifting movement of the bed carriage 39 as a component of the rolling movement by means of a control cam 38 to the position-tolerated analog value transmitter 37 and changing its output signal by means of correction amplifier 40 to the movement which is not directly proportional to the bed carriage movement Adjusted value corrected _? on the setpoint

14-4i S

Summing amplifier 11 connected; If the control deviation is formed from the standard value comparison, then the servo amplifier 10 is used. the adjustment to the constantly changing position of the moving element 5 "of the hydraulic motor 4 takes place as described above in connection with other occasions for the deflection of the lifting position

Claims (1)

15 - & l 1 0 Claim for invention Hydraulic Telemottfr- »Reversierantrieb _? connected to its closed hydraulic drive formed from a Hydrogeneratorj a hydraulic motor and a connecting this technically dense Rohrlei "tion system a distance-dependent controlled and supplied by an external pressure medium source Nachspeiseinrichtung for pressure medium and one of two acted upon by an external pressure medium source, seat valves safety device -. are closed _$
characterized by ^ that the make-up device is realized by a position control loop connected to the piping system of the closed hydraulic drive, which is coupled with a reversing path position adjustment with two statically applicable and at least one dynamically variable setpoint inputs / ö and the safety device with a position-dependent pressure control for the application so ™ as is equipped with a pressure-and time-dependent closing device of the two seat valve and an emergency shut-off control is coupled to the position control loop * Hydraulic Telemdtor Keversierantrieb after point characterized by ^ that the signals of the Sollwerteingabeη the Reversierweg ~ = position adjustment are superimposed on a Soliwertsignal the position control loop _? being a. statically applicable Sol3.wertsignal is manually adjustable, the second statically repositionable θ setpoint signal pre-adjustable and periodically callable and the dynamically changeable Sollwertsigtial as a function of. the technologically predetermined current position of the work area is controllable * 16- UiA JU 3 * Hydraulic OTeX motor drive after point; characterized; thereby, that the position control loop coupled to the moving element (3) of the HydrogßEsrators (2) setpoint »distance measuring system (8} and a sit the moving element (5) of the hydraulic motor (4) coupled actual value Wegmeßsystem (9), wherein the signal output of the actual value Wegmeßsystems (.9) is fed directly to an input of a servo amplifier (10), while the signal output of the setpoint distance measuring system (8) to an input of S'ollwert Sunnah amplifier (11) whose output is connected to the servo amplifier (10) guided isfe _f v / elcher is connected on the output side to a servo valve (12), at whose Druckö3. «Connects a hydraulic pressure generator (13)  and whose control oil connections are connected by means of lines (14, 15) to a respective line (6, 7) of the hoisting system of the closed hydraulic drive. 4 «Hydraulic {Pelemotor Reversing Drive. after point 1 to 3? characterized by, that the .Eeversiesweg Lageirerstellung to implement the static, manually applied setpoint signal is equipped with an adjustable potentiometer (34) 'whose signal output is fed to an input of the setpoint Suiaaierverstärkers (11), for the preset and periodically callable setpoint signal an adjustable potentiometer (35) quote _? whose Sigaalausgang is guided via a controllable switch (36) to a further input of the setpoint sum «amplifier (11) and for the realization of the current Hege of the work area analog Solltfertsignaics a lageboziehor ADülogwertgöber (37) isfc _? - mean signal output via airian correction gain? (40) to a fourth input; of ff4 740 Setpoint summing amplifier OI), switched; is " 5β Hydraulic iTelemotor hauling drive according to item 1, characterized by. ₉ ' that the two. Poppet valves (Ί6-17) & he safety device from the pressure generator (13) of the Lagerege! Circle via a branched line (18) $ in which a pressure accumulator (19) and a directional control valve (20) are connected, 'act' bar wherej the line (18) is branched to an adjustable pressure relief valve (21) which is controllable by a cam mechanism (23) j mounted on a part moving synchronously with the path of reversing movement of the hydrogenerator (2) and the outflow valves of the poppet valves are combined to form a conduit (24) and passed through a check valve (25) and a downstream adjustable throttle valve (26), as well as the conduit (24) between the check valve (25) and the throttle valve (26) Position (27) of the directional valve (20) '' branched off, is © Hydraulic electric motor reversing drive to. Point 1, characterized by ^ that the two seat valves (16 | 17) of the safety device of. the pressure flow generator (13) of the position control loop by means of a branched line, in which a pressure accumulator $ a directional control valve (20) and. a pressure control valve (28) controlled according to this is applied and the outflow line of the sifeventile (16, 17) is combined to form a line (24) and this via a check valve (2>) and a downstream ~ 18 adjustable throttle valve (26) is guided _? and the line (24) between the check valve «(2;?) and the throttle valve (26) to the adjusting unit (27) of the directional control valve (20) is branched off to Hydraulic 5? Elemotor- »Reversierantrieb nach Punkt 1j 3i 5 oclor 6j
characterized by in that the output of the servo amplifier (10) is diverted via an absolute value generator (41) to a first input of a comparator (31), to whose second input the maximum permissible system deviation can be connected as a reference voltage by means of an adjustable potentiometer (30) the output of the comparator (31) is connected to a Hotabschalfc control (32) and whose output is connected to the control of the machine · • sr