DE2160490C3 - Control valve device - Google Patents

Description

(34,

(73) »« «, de, in the housing (11) an-« ^^ "" "κ ^ Α« £> Signals on * »

2.AUiWH * -, according to claim. W ate Af_ «Mk._J | ._- ^ tS

characterized in that the electrical charge which device is also in the uena g

measuring device ((J) rearranged an electronic encoder. Patent No. 3,018,795 is a

holds a permanent magnet (67) and relat.v 30 From the USA ^ Patentscnn

movable to the latter, depending on the magnetic field ^^^^, ^^ Z ^^ i ^ k ^.

Has elements (69), and this of the type mentioned is known to be a baffle plate

amplifier (73) is an electronic amplifier. has tion. For this purpose · '« ^e ™ ^ ^r _a ^P _seiti

3 control valve device according to claim 2, on the outer diameter ^ of a D ™ .ebers emsuUg

characterized in that the permanent magnet 35 has a ^ P ^^ Xtais ninSg ηΓη 'end "with (67) together with an axis of the rotary slide valve assigned to it nina s soft iron body (70) with the flat slide of a single ^nozzle . _n ^e '" J ^S _pra i _iD , _a ™ _c ⁿ £ _{t au} f _dcr (34) is firmly connected and that the magnetic field transducer is arranged together at the Pra "P ¹ ^ ⁰ ^ 7 J ^ dependent elements (69) fixed to the housing ^ J ^ t'SSSS

ⁿ External valve device after one of the actuated actuators I on ^ This

speak 1 to 3, characterized in that the one unbefned.gend ^k ! «™« "

Flat slide (34) fixed to a shaft (35) sales of the * ™ * ™} ^{Λαηη €} * ¹ ™

is bound and that in the flat slide (34) parallellabwe.chung without ^^ J

IeI running to its axis of rotation, the pressure 45 Vorsteuerte.1 acts. D ^ »" ^d

medium connections controlling sleeves (58, 59) disadvantageous because the rotary valve g ^

are arranged, whose outer diameter so such ^S \ ^ ^{ue ntlle} \ ^ f; ^U "£ _n S _r t'e has

is as large as the diameter of the associated slides already has greater frictional forces,

Control openings (24, 25) in the housing (11). that will be overcome ⁿ

5. Steuerventüeinrichtung according to claim 4, 50 .st further characterized in that the flat slide has a valve with .F_ ^a _f ^ch .

(34) on "its opposite regions ^^^^^^^

Flat sides (51, 52) bounded by webs (62) derle uciiuu.g ^ u -v, - "rr ;; - · -"

Zones of the same pressure, which achieve the lesser effort than _ b «^

Pressure medium inlet (17) assigned to the 55 bern. Nevertheless, * ^a ^ ™ ™ ^{CT m ™ &}

Flachseücn adjacent room (61) inclusion set their high ^{R "bun} 8? ^kr f ^e _sn ^^

Ben and that on the flat sides of each other in the case of servo valves, the response sensitivity de.

Overlying zones with each other connection ha- valve ^ staHj ^ kjn wur J - ^^^ 3 ^^

6. Control valve device according to claim 5, 60 a device known in which eir ^ control slide, characterized in that a one-armed lever (48) is formed on the flat slide via a linkage from a lifting lever (34) , whereby with an additional, electro-hydraulic system designed as balls (42, 43) only the adjustment elements of the actuator (49) are operative. The system wc.st for this purpose uncn is connect vo by the balls (42, 43 Ge, 65 a servo valve controlled SteUrne on L gencinandcr acting the lever (48) bcaufschla- the servo valve upstream ^^ βτ D.ffe * ence amplifier receives here Although stcUungsabhangigc Si

1. Control device according to one of the signals from the servomotor, but not from the servo controller.

itself. Also of the control slide, no FIG. 2 shows a view of the control valve device

Signals fed back, so that with him a pure according to Fig. 1 in direction A in a reduced representation

There is control that is relatively imprecise and imprecise

works sensitively. _{Fig 3 e {nfm section m Unie} πΐ-ΠΙ to

The task at hand is to provide a control valve device 3 Fig. 1,

tion of the type mentioned with regard to its Fig. 4 a partial section through the control valve assembly

Response sensitivity with the lowest possible direction according to line IV-IV in FIG. I,

To improve construction costs compared to what is known. F i g. 5 the functional connection of the essential

According to the invention, this is achieved by the combination of parts of the control valve device according to FIG

nation achieved the following characteristics: io _and d

a) the rotary valve is designed as a flat slide. Fig. 6 is a circuit diagram of the electrical part d ^{eti of} the control valve device.

b) the Lagerneßgeret is an electrical device which The electrohydraulic control valve device 10 has an electrical device connected upstream of the converter according to FIG. 1 has a housing 11 which essentially controls differential amplifiers which are arranged in the housing 15 from a base plate 12 and an intermediate plate 13. _un d _e j _nem upper housing portion 14 is that four

In this way a control valve assembly screws 15 will be held together. The created, soft the mentioned simplicity and Ge base plate 12 has in a flange surface 16 the accuracy of the flat slide design and connections for a pressure transfer inlet 17, one with which despite the high friction 20 return 18, two consumer connections 1 °, 21 force levels in flat slide valves a response sensitivity achieved (Fig. 2) and a control 'il connection 22 on. The one of the high-quality two-stage base plate 12 has one of the flange surface 16 is superior to servo valves. This is made possible on the opposite control surface 23 in the control opening strengthening of the position error signal connected to the only electrical large consumer connections 19 21 in front of the hydraulic connections 24 or 25 on a common pitch circle part of the electrohydraulic converter. Already! '..! Are ordered (Fig. 5). Furthermore, in the case of small positional errors, the transducer is fully controlled by a control surface 23 connected to the inlet 17, so that it applies the full pressure difference to the inlet bore 26. a control bore 27 and the servomotor. In this way, the opposite return channel 28 can be used as part of the return 18.
On the control surface 23 of the base plate 12, an approximately two-fold flange surface 29 of the intermediate plate 13 is flanged on an otherwise identical, but with mechanical valve, which is about two times more responsive, while its other flange surface achieves significantly increased working accuracy. surface 31 the upper housing part 14 with its control. Furthermore, a reinforcement surface 32 can be applied in this way. As a result of the approximately ring-shaped formation that arises in comparison to comparable servo of the toe plate 13, between the valves is approximately ten times higher. Base plate 12 and the upper housing part 14 a

A particularly simple design results in the slide-out chamber 33, in which the control openings 24, 25

Design of the invention when the electrical position and on the pitch circle mentioned in the middle between

measuring device comprises an electronic transmitter, the inlet hole lying on the control openings 24, 25

a permanent magnet and, relative to the latter, open 40 26 and the return channel 28. In this

wegüche, magnetic field-dependent elements, slide chamber 33 is a flat slide 34 with the help

and when the differential amplifier is an electronic one of a shaft 35 rotatably arranged. The shaft 35 is

Amplifier is. Another particularly advantageous embodiment with two mutually opposite, from the

Designs of the subject matter of the invention result in flat slide 34 protruding sections 36, 37

from c ', en claims 3 to G, which contain in one the base plate 12 and the upper part of the housing

NEN features the high sensitivity with 14 penetrating bore 38 rotatably mounted,

support simple construction. An extremely which in the center of the mentioned pitch circle

expedient embodiment of the invention is obtained. Perpendicular to the axis of the shaft 35 and laterally

if the electronic encoder is offset with the flat one in the intermediate plate 13 there are two

slide coaxially and the permanent magnet as being coaxially 50 to each other? Holes 39, 41 arranged

weghcher part of the electronic encoder on the net, in each of which a ball 42 and 43 tight and

free end of the shaft carrying the flat slide is felt to slide. Between the balls 42, 43 and

are arranged. In this way, adjusting screws 44, 45 cannot be accessed from the outside

only the mode of operation disruptive influences, in particular in the bores 39 and 41 pressure chambers 46 or dere

Iragur

also a particularly compact one

Achieve construction; so the electronic transmitter can parts of an actuator 49.

advantageously in a space free of pressure medium. The flat slide 34 is parallel to one another

to be ordered. A game of the shaft can be adjusted 60 flat sides 51 and 52, with which he to the steering

particularly useful by connecting surfaces of the base plate 12 and the upper part of the housing

four magnetic field dependent elements wcitestgchend 14 borders. On the pitch circle mentioned are at at

turn off. the Flacnseiten 51, 52 approximately semicircular, fell

An embodiment of the invention is shown in the groove extending from one end face to the other: which are described in more detail at H'jnd of the drawing

bcn. This shows in ″ recess 55 in the area of the auxiliary bore 2

Fig.l is a longitudinal section through an invention connected to one another. In the same start

appropriate bulldozing direction, ^from the recess 55 and in the remote from de

5 6

The end faces of the flat slide 34 rest on the upper housing part 14 is a plug connector 89 Partial circle two slide bores 56, 57, each for an electrical input of a setpoint and for a sleeve 58 or 59 take up. The outside through an electrical supply of the differential amplifier The diameter of the sleeves 58, 59 is exactly the same size as the 73 provided. As the F i g. 5 and 6 show in more detail, The diameter of the assigned control openings 24, 5 is the differential amplifier 73 via lines 92 with 25 and larger than the width of the grooves 53, 54, so that the electronic encoder is connected. The giver in the middle position of the flat slide 34 a with has the four mentioned magnetic field-dependent elements Inlet 17 connected, from return 18 and elements 69 in a bridge circuit and is a first Room voltage separated from the consumer connections to the non-inverting input of the Dif-61 is formed. Both sides of the grooves 53, 54 and io reference amplifier 73 and a second voltage dem along this run from one sleeve to the other inverting input, so that at the output of the Difzwei narrow webs 62, which form the actual distance amplifier, only a difference value between the two seals of the pressurized room appears. The output of the differential amplifier 61 take over. In this way, pockets kers 73 are connected to a magnetic coil 93 63 in the flat sides 51, 52, which through bores 15 of the electrohydraulic converter 75. 60 are connected to each other so that the flat via a resistor 94 is the size of the slide 34 is pressure balanced. A clamping of the coil current is detected so that from a point 95 Flat slide 34 is prevented by this, and that via a resistor 96 to a summing point 97 Frictional forces are significantly reduced. Only then is there a current to limit the gain for the pressure equalization of the slide valve 34 are in eo flows when through the solenoid 93 of the valve Control surface 32 of the upper housing part 14 control input signal corresponding current flows. These openings 24, 25 as arranged in the base plate 12 causes a largely inertia-free control net. In order to meet the requirements of the electrohydraulic converter 75 for control valve devices To achieve the accuracy of the control openings, an input 98 is provided, which the upper housing part 14, base plate 12, intermediate «5 is connected to a summing point 99. Plate 13 and flat slide 34 in the same working As Figure 5 shows in more detail, the control valve device is drilled; the same also applies to the shaft device 10 with its consumer connections 19, 21 with 35 receiving bore 38. a double-acting servomotor 101, the inlet. In the upper housing part 14, the bore 38 opens into 17 with a pump 102 and the return 18 with it a space 64 which connects a container 103 as a position measuring device 65, receiving electronic encoder. This The mode of operation of the control valve described has one on the free end 66 of the shaft 35 device 10 is as follows, with for closer deposition Permanent magnet 67 and a ringing fixed to the housing, reference is made above all to Fig. 5: ordered encoder part 68, whose four magnetic field In the drawn center position of the flat slide dependent, Elements 35 through 34 designed as a field plate, the electrical input signal is equal to zero

69 in the diffused through the magnetic field of the permanent magnet 67 and the returned by the position measuring device 65 Column 71 protrude, which is also zero in one of the residual voltage. The output signal The soft iron body 70 of the differential amplifier 73 surrounding the permanent magnet 67 is thus zero, and is consequently formed are. The shape of the soft side body is the beam pipe 76 of the electro-

70 prevents a stray field of the permanent magnet 67 40 hydraulic converter 75 in its middle position, via the upper part of the housing 14. The four elements «; 69 so that in the pressure chambers 46, 47 of the actuator are arranged in a bridge circuit and thus result in 49 equal pressures. In this middle position the inlet 17 and thus the space 61 are largely blocked from the axial and radial play of the shaft 3S; independent signals. The outputs 72, which are hydraulically blocked, are also double-acting Field plates are 45 with an electronic differential servo motor 101, since the sleeves 58, 59 with the amplifier 73 connected, the control openings 24, 25 are aligned on the upper housing part 14. Thus, pee is arranged only under a cover 74. In addition to the Hch, a small flow of pressure medium to the inlet 17 Differential amplifier 73 is located on the housing via the rod filter 85 to the input of the electro-hyoid top part 14 an electro-hydraulic converter 75. The hydraulic converter 75 and arrives via the This converter has an electromagnetically actuated 50 jet pipe 76 and a return in the converter 75 in Jet pipe 76 and two hydraulic outlets 77, the container 103 back.

78, which via channels 79, 81 with the pressure chambers 46, If the input signal is now positive, then both

47 having a connection. The hydraulic input 82, for example, the jet pipe 76 of the converter 75 in

this converter 75 is moved to the left via a longitudinal bore 83, FIG. 5 and a corresponding one

a transverse bore 84 and a rod filter 85 with the 55 pressure difference built in the actuator 49, where-

Inlet 17 in connection. The best there is - the flat slide 34 counter to the clock-

The current arrangement of the rod filter 85 so that it moves in a clockwise direction. The flat slide controls

Flat slide 34 penetrates the recess 55, 34 the connection from the inlet 17 via the grooves

for a compact design of the Steuerventileinrich- 53, 54 and the control opening 25 to one side of the

device 10 particularly advantageous. The transverse bore 84 60 servomotor 101 and connects the other

is by a ball 86 and a plug 87 to the side over the control opening 24 and the grooves 53, 54

closed on the outside. From the transverse bore 84 leads to the return 18.

a channel 88 to the control oil connection 22. Through this, the electronic transmitter reports in the case of an Ausleri training, the rod filter 85 can be replaced by a bolt not shown in the counterclockwise direction of the flat slide 34; and the ball 86 V $ sense returns a negative differential signal which can also be removed, as a result of which the control valve-absorbing deflection of the flat slide 34 from the direction 10 for a central control position separated from the inlet 17 is greater. The difference between oil supply can be used. output and difference signal is then amplified

handler 75 entered. This way you can iei very small positional errors of the clektrohydraulisehc Ground converter 75 fully modulated so that the converter applies the full pressure difference to the actuator 49 can put. The flat slide 34 is always deflected so far. until the specified input signal and compensate for the difference signal reported back by the encoder. Depending on the size of the input signal, any position of the flat slide 34 can be controlled.

Correspondingly, if the input signal is negative, the jet pipe 76 is moved to the right

and a pressure difference, in the actuator 49 such constructed that the flat slide 34 moves clockwise. The flat slide controls 34 the connections to and from the servo motor 101

in the opposite direction. The electronic encoder reports when the flat slide 34 is deflected Clockwise returns a positive differential signal. The stress amplifier 73 then gives an amplified Signal to the converter 75, which is via the actuator

ίο 49 "the flat slide 34 quickly in that position which corresponds to the setpoint given at input 98.

For this purpose 2 sheets of drawings

Claims (1)

to 6, (totere "^ denotes that the S _e % ^ white with a housing of the control unit ^ gSSEfiSÄg "oh claim ^ erveotileinrichtung arranged Drebsctueber,! '^ 3SSS because four magnetic field ab- the Dructanittelverbindungen from and to dadurcb gekennzeicnn ι, _Brückensc l ^, _{tt, ng} a ". controls a servomotor, with an element hanging in the housing n »j w» arranged, actuated by the transducer are ordered, drive for actuating the rotary valve, with a device connected to the rotary valve, actuated by the latter and having a position measuring device, for returning a Si to the converter depending on the position send device for repatriation of a Si gnals on the converter depending on the position »5» ^ hits a control valve device, of the rotary valve, soft device also D »ErftataJ ^ nffi ^ hydraulic wall