DE1750695A1 - Pressure sequence valve device - Google Patents

Description

DipMnC 'Äüdolf Mobil *

741 Reutlingen / Württ.
Hindenburgstrasse 05 - phone 34718

Applicant: Rudolf B ^

Palmeretr. 9

Pressure sequence valve device

The invention relates to a pressure sequence valve unit * direction for successive mutual connection several consumers with a hydraulic or pneumatic pressure line with simultaneous' connection of the not connected Yei / o ^ alsoer with a return flow or Ent-IUf management,

The successive connection of several consumers with a hydraulic or pneumatic pressure line is bioher effected via electrically operated solenoid valves »whereby an automatic further switching mii.ölä pressure-dependent elaktr:.,? R <h« r switch or electrical limit switch controlled by the consumers is controlled wi -1

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Such facilities have the disadvantage that they are a electrical supply system and in the area of consumers ε-nßeordinate switching devices need, which you Application area remains relatively limited. Known Hydraulic switching valves that switch from one consumer to the at least with two consumers others can perform, have the disadvantage that the working pressure of the downstream consumer are so high must, like the Umechaltdruck, at which this second consumer is switched on. As soon as the working pressure on the second If the consumer drops more, these valves switch back to the first consumer. A series connection several such switching valves is therefore practical not possible because the working pressure of the last consumer is significantly higher than the switching pressure of the first Consumer would have to lie. In general, however, a common pressure generator is used in a hydraulic or pneumatic system, which on a specific Nominal pressure is designed with which all consumers are to be influenced in most cases. (To the stand the technology: pressure sequence valve from Werdohler Pumpenfabrik, Werdohl).

The invention was based on the object of creating a Druokfolgesohaltventilelnriohtun * which can also be combined in a common Oehäuae and

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which allows very strong pressure drops in the individual consumers to be switched on one after the other without there is a risk that a switch back to the previous consumer must be feared, and which also allows a different setting of the switching pressure for the individual consumers.

This object is achieved according to the invention in that "

the Brucksequerschaltventilelnrichtung preferably on like commonθ valve housing with a common pressure line «- and a common return line connection, and that in the uehäuse for each of the one after the other consumer to be operated one against one restoring force, preferably spring force, from its first Schaltotellur ^. Can be adjusted in a jump to a wide switch position Control slide is arranged with a differential piston section, with which the in the supply line occurs ( tende tMao holding pressure acts on the Differenefläohe, and that each control slide influences the associated consumer and also the following consumer in both switching positions. The differential piston section of the control slide cooperates on both sides with valve seats and at least one of its end faces is slightly concave and ends in a cutting edge that ensures a tight fit against a valve seat that forms the opening of a connection channel leading to the downstream consumer is limited

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In the device according to the invention, the switching pressure only affects the differential piston area of the individual Control spool. This area is only a few percent of the piston face ending in a cutting edge. Due to this small differential piston area for the switching pressure is only a relatively weak one, the ^ Return spring of the control spool that determines the switching pressure is required. The pressure prevailing in the newly connected consumer can be compared to the switching pressure in the same Ratio, i.e. very sharply lower, how the differential piston area behaves in relation to the remaining piston end face acting in the same direction. Auoh with the following closed This low minimum pressure does not increase for consumers.

By forming a shadowy edge on the The front side doesn’t allow for the pressure fluctuation treaty * Handles the establishment's important ratio of these areas keep to each other very precisely · Until the beginning of the reversal movement, the concave piston surface delimited by the blade-like edge is completely closed off from the pressure line channel and forms a very small gap certainly avoided. When lifting the piston face from the valve seat as a result of the switching pressure acting on the differential piston surface, hydraulic fluid or compressed air flows into the through the concave design of the Front side created cavity. As this cavity see

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widened towards the center of the piston, but the speed of the inflowing pressure medium decreases, so that a strong static pressure is immediately effective on the piston face, which quickly and suddenly shifted to its second switch position.

Each control slide valve according to the invention comprises a throttle similar to pin which projects into the first switching position and during a partial stretch of the adjustment path of the control slide in the second switching partition in the opening of the leading to the by "consumer following Verbindungakanale. This ensures on the one hand that after the end face is lifted from the valve site, there is still no strong outflow of the pressure medium into the connecting channel leading to the downstream consumer, which could exert a suction effect on the piston and thus impair the spring force, and on the other hand it is ensured that the Pressure medium only rolls to the following control slide when the moving control slide has closed another connecting channel. In its first viewing position, each control slide valve forms not only a connection between the connection channel to the upstream control slide valve and the connection channel of the associated consumer, but also a connection between the connection channel via a second connection channel to the downstream control slide valve. 109817/0497

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channel of the downstream consumer and the common Return or vent line. The last-mentioned connection must first be interrupted by the control slide before the connection channel to the downstream control slide for the pressure medium is released.

B | According to the invention, each control slide forms in its own

second switching division a connection between the connecting channel to the previous control slide and the Connection channel to the following control slide and a connection of the connection channel for the associated one Consumers with the common return or vent line.

The pressure sequence switching valve device according to the invention can expediently be provided with a main valve in the pressure outlet channel, which is connected upstream of the control slide and which can, for example, be operated arbitrarily and, in addition, depending on the position of the latstan control slide, it automatically controls the connection of the Bruok line to the common Rüokfluss- or Bntlüftungsleitung or the first control slide.

D ^ e the necessary Umsohaltdruok determining the return springs of the individual tax levers have different strengths. The facility can also

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forms that the preload of the return springs of the control slide can be adjusted. In a preferred embodiment, the return force is the Control slide caused by helical springs, the ends of which are bent up and protrude into recesses on the one hand in the control slide and on the other hand in the valve housing and thereby prevent the slide from rotating in its valve housing, so that no special guides are required for this purpose must be seen «

Details of the invention emerge from the following description in conjunction with the drawing which is shown more or less schematically in various views and switching positions of an exemplary embodiment of a pressure flask switching valve device designed according to the invention.

Ia single violins:

Figo 1 shows a centralett cross section through the common valve housing along the line I - I in Figure 2 |

2 shows a plan view of the valve device arranged in a common housing;

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3 shows a partial section through the head part of the common valve housing along the line III-III in FIG. 2;

4 shows a section corresponding to FIG. 3 along the line IV · IV in FIG. 2;

5 shows a sectional view of the device in the area of the height V - V in Figure 1;

FIG. 6 shows six consumers in the form of three pressure cylinders with pistons that can be acted upon on both sides, in a schematic representation;

Fig. 7 is a Teilachnitt along the line VII - VII in Figure 2 in relation to the figures 1 to an enlarged Maßstabj

FIG. 8 shows a section along the line VIII - VIII in FIG. 7;

FIG. 9 shows a section along the line IX-IX in FIG. 7.

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The pressure sequence valve device according to the invention shown in the drawing is in a common housed multi-part housing 10, which is composed essentially of a head part 101, a central part 102, a bottom chamber part 103 and a flange plate 104 is. These four parts are connected by means of connecting screws 11 held together, one of which is shown in FIG.

As the central sectional representation of FIG. 1 shows, the device has a main slide 13 which is arranged in a central cylinder bore 12 of the housing head section 101 and which protrudes with its guide part 131 through a housing extension 105 near the outside. The main body 13 has a tapered central section 132 and at its inner end a control piston part 133, the meaning of which will be explained later.

Over the circumference of the cylindrical exactness 10, six cylinder chambers 14 to 19 are arranged in the housing head part 101 and in the housing central part 102, running axially parallel and evenly distributed, as can be seen from FIG. 2 and FIG. In each Zyllnderkamaer 14 to 19 let one Steuerereonleber 20 to 25 arranged, which are all the same and of which only the three in the drawing first control spool 20 to 22 and the last control

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slide 25 shown aind ₀ The control slides are mounted with their middle part in the housing central part 102 and have a differential piston section 26 in the upper part of the cylinder chambers formed in the housing head part 101, which is described in more detail the force of a return spring 27 is adjustable, which is designed as a helical spring and whose bent-up ends 271 and 272 each protrude into a base bore in the control slide and in the housing plate 104. As a result, the springs 27 simultaneously act as an anti-twist device for the control slides 20 to 25 * so that the control slides do not require any separate longitudinal guides.

The springs are arranged in the oil chamber 28 formed in the housing bottom channel part 105, which is located near the outside via a central opening 29 in the housing flange plate 104 open lato In the oil amnelraun 28 frets aäntlioha return flow channel · including a tob main slide 13 controlled main return flow channel 30. The bin assembly housing 10 can «with the flat plate 104 directly on an oil container be attached, the aentral opening 29 in the base plate 104 one for all to the Einxiohtung aneohloaeenen Consumers total return line forms.

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Since there is a Druckfolgeechaltventileinrichtung, wherein the plurality of connected loads to be operated in a particular sequence one after the other, the first cylinder chamber 14 is connecting line via a View "31 is connected to the second cylinder chamber 15. This cylindrical chamber is again a con - ■ dungaleitung 32 with the following cylinder rough 16 vex- ^ bound. In the same way, the remaining cylinder spaces 16, 17, 18 and 19 are connected to one another via connecting lines 33 * 34 and 35, all of which can be seen in FIG. The last cylinder space 19 is connected via a connection line 36 to the central cylinder bore 12, into which a connection line 37 leading to the first cylinder space 14 also opens. The device and thus all connected consumers are connected to a pressure medium source, for example a hydraulic pump, via a common connection channel 38 which also leads into the central cylinder bore 12.

The consumers assigned to the individual control slides 20 to 25 are connected to the housing central part 10 at the level of the line VV (Pig. 1), as can be seen from FIG. Ale consumers are * »hydraulic pressure relieving% j A _4, B and C may be provided scjiesiatisch shown in Figure 6, three, each having a piston on both sides baaufschlagbaren. The consumers should

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V ₁ and V2 represent the two pressure chambers of cylinder A, while consumers V », V ₄ and Vc and Vg are formed by the two pressure chambers of the other cylinders B and C. The consumer V ₁ is connected to the 3-cylinder space 14 of the valve housing 10 via a connection channel 39. The consumers Vp to Vg are connected to the cylinder chambers 15 to 19 via connecting lines 40 to 44. As can also be seen from Figure 5, the individual cylinder chambers of the housing 10 are not only connected to each other via connection lines 31 to 35, but also via connection lines 45 to 49 Valve chambers 14 and 15 with the consumer connection channel 40 of the valve chamber 15, the connection line 46 with the consumer connection channel 41 of the valve chamber 16, etc., and finally the connection line 49 with the consumer channel 44 of the valve chamber 19. The connection between the two aligned channels is through the Control slide 20 to 25 arranged in the cylinder chimneys, as can be seen in detail in FIGS. 7 to 9.

As FIG. 7 shows, the control slide has an upper transverse bore 50 and a lower transverse bore in its middle part.

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bore 51, which are connected to one another by a central channel 53 in the control slides. The control slides 20 to 25 also have a tapered part between the differential piston connector 26 and their central guide part, in which the transverse bore 50 is made. In their middle part, the control slides are provided with an outer groove 54 which, according to FIG. 8, extends over three quarters of the circumference of the slider. In addition, the control slides have two diametrically opposite longitudinal grooves 55 and 56 in their lower part (FIG. 9). which lead to the Oleammeiraum 28 " form the connecting channels"

The differential piston section 26 of the control valve, which is accommodated in the upper part of the cylinder chambers 14 to 19 has a special design, which represented an essential part of the invention. As best shown in FIG. 7, the differential piston area is in comparison

Similarly to the upper side of the piston face 58, it is relatively small. The upper piston face 58 is concave in shape and ends in a sharp-edged, non-denatured rim 59 which ensures a tight fit against the associated valve face 60. The lower end face 61 of the differential piston section 26 is also provided with an edge protruding in the shape of a silk and acts in the second switching position with a central housing part on the top side.

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les 102 auB ^ ebildötön valve seat 62 jsue & iwaan ,,! This prevents leakage losses in the second switching division of the control spool, which can occur in the individual Would add control spools "

On the obscure piston face 53 is the control slide uiit an urosaelzai'i'en 63, who in the first keep division of the ^ tax slide in the connecting line 51 to 36 asur the following oteuere slide- ^ ylinder- r protrudes ο

Me './irkung ,eise the printing sequence direction according to the invention is the following ι

In the idle state, all of the control slides 20 to 25 are in their upper, first switching division, which can be seen, for example, in FIG. The main slide valve 13 is in the upper position shown in FIG. 3, in which a lower valve piston part 133 blocks the connecting channel 37 on the cylinder space 14 of the lower control slide valve 20, so that pressure fluid flowing in via the common connecting channel 33 is discharged from the lower valve part 132 of the main slide valve 13 gate “I Ubor the main locomotive river terminal 30 in the OlaruuualreuB 28 of the housing · and sound da aua over the common UUokloitung 29 in a 109817/0497

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Hydraulic fluid container is conveyed. The pole holding process is initiated by engaging the main slide 15 in the position shown in FIG KanHo The first control slide 20 is in its upper first switching position. In this position, the hydraulic fluid that has flowed into the cylinder chamber 14 can be fed to the consumer V via the transverse bore 50, the connecting channel 53 and the transverse bore 51 of the control slide 20 ₁ leading connection channel 39 (Pig-5) continue to flow. In one cylinder chamber of cylinder A (Fig. 6) _{ which forms the first consumer V ₁ , pressure fluid flows, and the piston of cylinder A is moved downward in Fig. 6 until it strikes. As soon as the Ä

When the piston has reached its lower limit position and cannot perform any further downward movement, the rises Pressure in the pressure pipeline system, i.e. also in of the cylinder chamber 14. The increasing pressure acts on the Differential piston area of the differential piston section 26 of the control slide 20c as soon as it has reached a value which the force effect of the associated return spring 27 equalizes, the control slide 20 is moved downwards and thus the sharp-edged edge 59 of the upper column

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Benetirnfläche 58 lifted from the valve seat 60. Drueköl flows into the calibration opening gap and the pressure present in the cylinder 14 is effective on the entire end face 58 , so that a sudden downward movement of the control slide 20 takes place in its second switching position, in which the lower piston face 61 rests against the valve seat 62 and the top Zylinfc the chamber 14 closes against the in-Gehäuseaentralteil 102 part of the cylinder chamber to the Leckölver- · loss as low as possible to keep "

During the first part of the downward movement of the control slide 20 into its lower, second holding part, the throttle pin 63 of the control slide still protrudes into the opening of the connecting line 31, which leads into the cylinder chamber 15 of the following control slide 21. This prevents the pressure fluid from flowing rapidly past the upper end face 58 while lifting off the valve side 60 and thus prevents a suction effect on the control slide 20, which could impair the jumping character of the reversing movement. This also ensures that until the connecting line 31 is fully released, the slide 20 is moved so far down that its transverse bore 51 is no longer aligned with the connection channel 39 and the previously existing connection between the control slide to the following control slide

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21 leading connecting channel 45 and the Entlüftuagskanal 56 of the control slide »20 is canceled. Like from figure can be seen from the control slide valve 21 and 22 shown there, was via the connecting channel 45 (analogous to 46) and the venting channel 56 of the control slide 20 (analogous to 21) the consumer Vp »that is the width Chamber of hydraulic cylinder A, vented. Before i.e. the pressure fluid flowing through the inlet channel 37 into the cylinder chamber with the control slide 20 remaining in its second switching position into the connecting line 31 to the cylinder chamber 15 of the control slide 21 and from there via its cross bore 50, connection channel 53 and cross bore 51 to the connection channel and in the consumer Vp can flow, the previously existing vent line via channel 45 and channel 56 is interrupted. At the same time, in the second λ switching position of the control slide 20, the consumer V * is vented via the connecting line 39, the annular groove 54 and the longitudinal groove 55 in the oil collecting chamber 28 of the housing 10

The pressure oil flowing into the consumer Vg moves the Piston of the hydraulic cylinder A naoh up to a stop. If this stop is reached, it increases Pressure with continuously running pressure fluid pump in the duct on the pressure side and thus also in the cylinder chamber 15, «The rising pressure acts on the difference.

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renzkolbenfläche 57 of the control slide 21, and when the pressure exceeds the force of the return spring 27, the strength of which can be different for the individual control slides 20 to 25, begins - as already explained in connection with the control spool 20 - the sudden changeover of the second spool 21 _β in its apparent from Figure 7 lower second switching division result, the communication passage 32 is released and the pressure fluid can through the common connecting conduit 38 through the communication passage 37 to the first cylinder chamber 14 via the connecting channel 31 into the second cylinder chamber 15 via the connecting channel 32 into the third cylinder chamber 16 and via the connection channel 41 into the consumer V, Strumen. The same cycle is repeated, has been shifted to the last spool 25 in the cylinder chamber 19 in its second switching position "The W in figure 1 illustrated last spool 25 then from the common Anschlufikanal 38 all through the tops cylinder chambers passes 14 to 19 flowing pressure liquid Via the connecting line 36 (Fig. 1) on the underside of the control piston part 133 of the main slide 13. The main slide 13 is thereby shifted upwards until it has reached the starting position shown in FIG connects directly to the return channel 30, and in which position the control

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piston 13? the input of τ in the first cylinder 14 combs leading Verbindungaleitung 37 closes "follow shift valve means, the pressure and thus a further supply of the consumers V ₁ to V ₆ with pressurized liquid is alao off automatically.

From the foregoing it can be seen that each Control slide in its first upper switch position ^

a connection between the connection channel to the pre switched control slide and the connection channel dee associated consumer and at the same time via a second Connection channel & l to the downstream control spool one Connection between your connection channel of the following Consumer and a return line forms »This interaction of two adjacent control spools is therefore together with the special design the control spool and the arrangement of a main spool | characteristic of the present invention. This interaction between the individual control slides is also in given the second lower switching position of the control slide, in which each control slide has a connection between the connecting channel to the preceding control spool and the connecting channel to the following control spool as well as a connection of the connection duct for the train

arranged consumers with a reflux line and ultimately with the common reflux or vent line

the valve device formed 109817/0497

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In the illustrated example, the return springs 27 are anchored with their lower end 272 in the housing flange plate 104 * But their lower end could also be anchored in a separate bearing plate 8ein ₉ which can be adjusted in the vertical direction with the help of an adjusting screw? in order to be able to adjust or readjust the bias of the return spring in this way. The structural embodiment of a pressure sequence valve device according to the invention can be varied in many ways. In the illustrated embodiment, the individual control slides are arranged along a circle in a cylindrical housing, whereby a particularly space-saving design of the valve device is achieved and special leakage oil channels are omitted. The control spools could, however, also be arranged next to one another along a straight line in a common valve housing. Individual housings could also be provided for each control spool, which can be connected to one another by external lines or attached to one another in the manner of a modular system «

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Claims (1)

P 762 - 21 - Claims ο Druckfolgeachaltventileinrichtung for consecutive automatic connecting a plurality of consumers with a hydraulicheη or pneumatic pressure conduit while connecting the unconnected consumer with a reflux or vent line, characterized in that it is preferably a common valve housing (10) tungs- with a common Drucklei and a common return terminal (38; 29) , and that in the housing (10) for each of the consumers (V ₁ to Vg) to be actuated one after the other, a position that is abruptly adjustable against a restoring force, preferably spring force (27) from a first holding position to a second holding position Control spool | (20 to 25), old one Differenmkolbenabschnitt (26) 1st arranged in which "of the supply line occurring Umschaltdruok on the differential area acts and DAJ each Steuersohieber (20 to 25) in both switching positions the" ug · arrange th and also the following consumers (V. to V ₄ -) influenced. 109917/0497 BADORtQfNAjL P 762-22 Pressure relief valve device according to claim 1, characterized in that the differential piston section (26) of the control slide (20 to 25) cooperates on both sides with valve seats (60, 62) and at least one of its end faces (58) is slightly concave and in a blade-like edge (59) ends, which ensures a tight fit against a valve seat (60) which limits the opening of a connection channel (31 to 35) leading _{to the downstream control slide and thus to the downstream consumer (V 1 to Vg).} Pressure sequence valve device according to claim 2, characterized in that each control slide (20 to 25) has a throttle pin (63) which is in the first switching position and during a section of the adjustment path of the control slide in the second switching position into the opening of the connecting channel leading to the following control slide (31 to 36) protrudes. Druckfolgesobaltventileinriohtung according to one of the Claims 1 to 3 »characterized in that each Control slide (20 to 25) in its first switching position a connection between the connecting channel (31 to 35} 37) sum upstream control 109817/0497 slide (20 to 25) and the connection channel} (39 to 44) of the assigned consumption exe (V ₁ to Vg) and via a second connection channel (45 to 49) to nearby «control spool a connection between after the connection channel of the following consumer chere and the common reflux or ICventilation management (over 55) formed Λ Pressure sequence switching valve device according to one of claims 1 to 4, characterized in that each control slide (20 to 25) in its second switching position a connection between the connecting channel (31 to 35; 37) to the preceding control slide and the connecting channel to the following control slide and a connection to the connecting channel (39 to 44) - for the associated consumer (V ₁ to V ^) with the common reflux or venting line (via 54, 55). Pressure sequence valve device according to one of the Claims 1 to 5 «characterized in that they are connected upstream of the Stevsr slide valves (20 to 25) Main slide (i3) in the common anchor channel (38) which, depending on the position of the last control slide (25), connects the ge « common connection channel (38) with a RUokfluss-109817/0497 17506S5 P 762 - · 24 - or vent line (30) or the first control slide (20). 7ο Pressure sequence valve device according to one of the Claims 1 to 6, characterized in that the return springs (27) of the individual control slides (20 up to 25) have different strengths » 8c Druckfolgescbaltventileinrichtung according to one of the Claims 1 to 6, characterized in that the Pre-tension of the return springs (27) of the control spool (20 to 25) is adjustable « 9c pressure sequence valve device according to one of the Claims 1 to 8, characterized in that the restoring force is brought about by helical springs, the ends (271, 272) of which protrude into recesses on the one hand in the control slide (20 to 25) and on the other hand in the valve housing (104) and prevent the slide from rotating » 109817/0497 BATH ORIGINAL . is-. _t Blank page