FLUID SEQUENCER

The invention concerns a fluid sequencer with bolting device the two successively steps, with a preparation stage, following in a secondary control, at least two step stages and in particular with a final stage for the feedback of the end of sequence of the sequencer to the preparation stage, how each step stage at least one signal input, a signal output as well as a control line to a first control port of the subordinate step stage are assigned to the same and are assigned in everyone a ski selector valve with at least four steered connections, of those one as over an additionally arranged Wegeventi! with printing media supplied inlet connection, one as the first power port for the respective step, a further than Rücklaufbzw. when exhaust port and finally one serve as the second power port, and whereby each of the ski selector valves exhibits a first control port as well as, a second control port standing with the signal input for the feedback of a step in effect connection. From the FR-PS Nr.2.152.439 a sequencer of the indicated kind is well-known, with which each step stage exhibits a 5/2-way valve and which is equipped with a preparation stage. Here the five steered connections as well as the two control ports of the ski selector valve are in such a way interconnected that the final signal of a step stage is always supplied to the following step stage and the fluid supply of the individual steps takes place in the sequencer opposite for successively following execution of the different steps, so that each step is supplied from the rear ago with fluid. Above all however it is from disadvantage that only the step of individual ski selector valve is locked to a group by steps of following ski selector valves, whereby for this bolting device an additional valve and an additional AND element become necessary, which requires a complex interconnecting. A bolting device of each step stage is not given with this sequencer, so that in particular with continuously lining up signal in a signal input, e.g. due to a wedging limit switch, erroneous switchings can occur. Task of the invention is it to train a sequencer of the kind mentioned in such a way that it gets along with less expenditure and avoids erroneous switchings also with constantly lining up signals in signal inputs in each step stage. This is reached in accordance with the invention primarily by that in each step stage of the sequencer for feedback of the beginning of a following step and/or the end of the last step the signal input of the step stage concerned with therein the used, which is connected respective step for steering ski selector valve at its second control port that by this ski selector valve on the one hand the second power port is attached at the inlet connection of the ski selector valve in the subordinate step stage as well as on the other hand the first power port is across the control line for the respective step of the step stage concerned led to, the first control port existing at the ski selector valve of the subordinate step stage and that in all step stages over the associated ski selector valve the inlet connection in each case either with subjected first control port with the first power port or is connected to subjected second control port with the second power port. In this way the sequencer builds simply, by needing only one valve for each step stage and prevents erroneous switchings by the special kind of interconnecting, even if in a signal input continuously signals are applied to each step stage; the sequencer stops also in this case in the place concerned. Security against erroneous switchings is thus increased with small valve expenditure. Furthermore the sequencer for different switching types of its exits is suitable. By the use only one ski selector valve for each step stage is simplified interconnecting, so that in each step stage one becomes possible compactly and simply building step plate with finished cross connections, from which only the signal outputs and the signal inputs be interconnected must; the assembly of the sequencer becomes simple thereby. Further special favourable arrangements of the invention article result from the Unteransprüchen. In the designs three remark examples according to invention developed of the fluid sequencers are illustrated. Show: Fig.1 and 2 a logic diagram and/or a pneumatics - diagram for such a sequencer with ever three steps; Fig.3 and 4 two fluid sequencers with ever six step stages in different kinds of interconnecting; Fig.5 to 8 the step plate for the assembly of the ski selector valve in plan view, used in a step stage, and/or. under-face and/or in the profile VI! - VII, as well as in the cross section VIII VIII the Fig.5; and finally Fig.9 to 13 the connection plate for both ski selector valves of the preparation stage, again in Drauf view and/or under-face and/or in the profile XI-XI as well as in both cross sections XII-XII and XIII XIII the Fig.9. The fluid sequencer represented in Fig.1 in the logic diagram --10-- is into a preparation stage --1! --, three successively-following steps --12,13 and 14-- as well as into a final stage l0 --15-- arranged. Into the preparation stage --11-- becomes at a setting impulse entrance --16-- a signal entered, that over an OR gate --17-- a memory --18-- (Flip-flop) and a second memory --19-- the first step stage --12-- sets and there at an AND element --21-- lines up. At one also --22-- a signal an inhibit unit knows characteristic START input E1 --23-- are entered, that with missing reconducting signal from the final stage --15-- over the line --24-- the memory --18-- and over and element --21-- a signal in one also --25-- characteristic signal output A1 causes. In the signal output A1 lining up compressed air sets a third memory --26-- the second step stage --13-- and a fourth memory --27-- in the final stage over a line --28--. Becomes now at one also --29-- designated second signal input E2 at the first step stage --12-- the end of the first step and/or. the beginning of the second step acknowledged, then arrives this signal over a second AND - member --31-- to a third AND element --32-- and stands in one also --33-- designated signal output a2 on. Compressed air in the signal output a2 sets a fifth memory --34-- the last step stage --14--. Becomes now at one also --35-- designated, third signal input E3 at the second step stage --13-- the end of the second step and thus the beginning of the third step acknowledged, then this signal arrives in appropriate way over a fourth AND element --36-- to a fifth AND element --37-- and stands in one also --38-- designated signal output A3 on. Compressed air in the signal output A3 sets the fourth memory --27-- the final stage --15--. Becomes finally at one also --39-- designated signal input E4 the end of the last step acknowledged, then this signal sets the fifth memory --34-- and over a sixth AND element --41-- compressed air flows to a seventh AND element --42-- the final stage --15--. The final stage --15-- the end of the last step announces over the line --24-- the preparation stage --11-- back and the memory sets --18,19-- for a new cycle. Of the memory --18-- the preparation stage --Ii--, of second (31), fourth (36) and sixth AND element --4-- the step stages --12,13,14-- are also in each case --43,44,45 and/or 46-- designated signal outputs M1, M2, M3 and/or M4 led out. The Fig.2 shows a pneumatic connection diagram, with that the logic diagram after Fig.1 for the sequencer --10-- one realises, same parts as in Fig.1 with same reference symbols are provided. The preparation stage --11-- first (51) and second points 5 ways - to 2 control valve --52-- up; first to third step stage --12 to 14-- and the final stage --15-- point in each case only one 5 Wege-2 control valve --53,54,55 and/or 56-- up. The 5/2-way valves --52 to 56-- are among themselves and have in each case a first connection --57 (P)--, &5 second (58) and third connection --59 (A and/or B--), a fourth connection --61 (R)--, a fifth connection --62 (s)-- likewise for the return as well as first (63) and second control port --64 (Y and/or Z)--. The Steuerglied of a ski selector valve --52-- takes with pressure in the second control port --63-- first (65) and with pressure in the control port --64-- a second position --66-- . In the first position --65-- is the first connection --57 (P)-- with the third connection --59 (B)-- the second connection --58 (A)-- with the fourth connection --61 (R)-- connected and the fifth connection --62 (s)-- closed. In the second position --66-- is the first connection --57-- with the second connection --58--, the third connection --59-- with the fifth connection --62-- connected and the fourth connection --61-- closed. The first ski selector valve --51-- differs from the second ski selector valve --52-- only thereby that it no first control port (Y) exhibits and its Steuerglied of a feather/spring --67-- in the first position --65-- is centered. In the preparation stage --11-- is the setting impulse entrance --16-- over a line --68-- with the first connection --57 (P)-- the first ski selector valve --51-- connected, its fourth connection --61-- a line --69-- with the START input --22-- and its fifth connection --62-- a line --71-- with a fluid supply entrance --72-- connects. Furthermore are at the first ski selector valve --51-- the second connection --58-- over a line --73-- with the second control port --64-- the second ski selector valve --52--, the third connection --59-- over a line --74-- with the first control port --63-- the second ski selector valve --52-- and the second control port --64-- over the line --24-- with the third connection --59-- the ski selector valve --56-- the final stage --15-- connected. With the second ski selector valve --52-- is the first connection --57-- over a line --75-- with the fluid supply entrance --72--, the second connection --58-- over a line --76-- with the first connection --57-- the 5/2-way valve --53-- the first step stage --12--, over a line --77-- with the signal output M1 (43) and the third connection --59-- over a line --78-- with the first control port --63-- the ski selector valve --53-- the first step stage --12-- connected. With the ski selector valve --53-- furthermore connect a line --79-- the second connection --58-- with the first connection --57-- the ski selector valve --54-- the second step stage --13-- as well as a line --81-- with the signal output M2, a line --82-- the third connection --59-- with the first control port --63-- the ski selector valve --54-- as well as a line --83-- the third connection --59-- with the signal output A1 (25) and a line --84-- the second control port --64-- with the second signal input E2 (29). The signal output A1 (25) is over the line --28-- with the second control port --64-- the ski selector valve --56-- the final stage --15-- connected. With the ski selector valve --54-- the second step stage --13-- are according to connections as with the ski selector valve --53--: A line --80-- for the first connection --57-- the ski selector valve --55--, a line --85-- to the signal output M3 (45), a line --86-- to the first control port --63-- the ski selector valve --55--, a line --87-- to the signal output a2 (33) and a line --88-- to the signal input E3 (35). With the ski selector valve --55-- the third and last step stage --14-- are according to connections as with the ski selector valve --54--: A line --89-- for the first connection --57-- the ski selector valve --56-- the final stage --15--, a line --91-- to the signal output M4 (46) a line --92-- to the first control port --63-- egeventils --56--, a line --93-- to the signal output A3 (38) and a line --94-- to the signal input E4 (39). The impact of the sequencer --10-- is as follows: The Vegeventile --51,52-- the preparation stage --11-- have the task to set the sequencer so far necessarily correctly after a cycle the sequencer --10-- to prepare again for a new start and to prevent erroneous switchings with continuously lining up starting signal. The ski selector valves --53,54,55--take over the bolting device of the different steps among themselves; each ski selector valve corresponds to a step. The ski selector valve --56-- the final stage --15-- finally it queries whether the last step was implemented and releases only then the new start, so that the sequencer remains standing with incorrect signals. By a signal at the setting impulse entrance --16-- becomes the second ski selector valve --52-- and the ski selector valve --53-- the first step stage --12-- in each case into their first positions --65-- brought; the position of the remaining ski selector valves --54,55,56-- can be arbitrary. If all start conditions are fulfilled and if the START input E1 (22) receives a signal, then scolded the second ski selector valve --52-- into its second position --66--. Compressed air flows now from the fluid supply entrance --72-- over the ski selector valve --52-- for the first connection --57-- the ski selector valve --53-- the first step stage --12-- and it flows to the signal output A1 (25) whereby the first step is implemented. Keeps simultaneous over the line --82-- the first control port --63-- the ski selector valve --54-- Compressed air and sets this into its first position --65--. At the signal input E2 (29) of the first step stage --12-- a signal for the beginning of the second step is then introduced. Scolded the ski selector valve --53-- into its second position --66--, whereby compressed air over the line --79-- to the ski selector valve --54-- and far to the signal output a2 (33) flows and the second step implements. In appropriate way also the third, last step runs off. The end of the last step causes a signal at the signal input E4, whereby the ski selector valve --55-- into its second position --66-- one brings. Compressed air flows now over a line --89--, the ski selector valve --56-- the final stage --15--, the line --24-- to the second control port --64-- the first ski selector valve --51-- the preparation stage --11-- and the sequencer prepares for a new start. Available sequencer --10-- those has actually well-known characteristics that she stops during missing feedback for the execution of a step, e.g. with defective limit switch, and that her not reacted to signals of limit switches, which is operated at the wrong time, e.g. during incorrect operation. Beyond that it has the additional advantage that with continuing signal of a limit switch (e.g. if this wedges) the sequencer --10-- in the place concerned stops, however a step does not jump over and then keeps running. This is reached by that with preparing a ski selector valve by the setting signal of a preceding step stage the ski selector valve in its second position --66-- remains and of the continuous signal in the assigned signal input E in his second position --66-- one holds, so that the signal output B of this ski selector valve does not receive compressed air. A further advantage of the step --10-- arises as a result of the final stage --15--. If at the signal inputs E2 to E4 by simultaneous manipulation of all limit switches signals are applied to a plant, could with missing final stage --15-- a cycle after the other one run off. The final stage --15-- caused now that in this case the cycle can going through only up to the last step and standing then remains. Only by a renewed signal at the START input --22-- a new cycle can begin. The sequencer --10-- made possible in particularly appropriate way also two different possibilities of interconnecting the signal outputs in order to implement the instructions correctly. Fig.3 shows a first kind of interconnecting for one to six step stages extended sequencer --91-- after the invention. Here the signal outputs become A1 to A6 on memory --92-- led and there stored, until the appropriate cylinder would drive the Gegenhub out must. The signal outputs M1 to M6 can be used as test supply points. Fig.4 shows a second kind of interconnecting for the sequencer likewise extended on six step stages --91-- after the invention. Here compressed air of the beginning of the respective step up to the end of the cycle always lines up at the signal outputs M1 to M6. These signal outputs M1 to M6 are with inhibit units --93-- connected. One uses here a signal e.g. M1 for driving a cylinder out and closes then the signal the exit, which is to cause a bringing of the cylinder in. The signal outputs A1 to A6 can be used here as test supply points. “” a step plate shows 0 Fig.5 as part of a step stage --95-- in plan view, on which a 5/2-way valve is flanged on. Same parts as in Fig.2 are provided with same reference symbols. The step plates of the step stages --12,13,14-- and the final stage --15-- are identical trained, so that in the following on that the first step stage --12-- Purchase is taken. The step plate --95-- is quaderförmig and points at a flange surface --96-- all connections --57,58,59,61,62,63,64-- for the ski selector valve --53-- up. On a opposite surface area --97-- (S. Fig.6) are the signal outputs (A1, M2) --25,44-- as well as the signal input (E2) --29-- trained. Furthermore the connections lead --R and S-- over openings --98, 99-- outward. In the step plate --95-- lead parts of the lines --76,78-- of the P connection --57-- and/or of the first control port (Y) --63-- to openings --101,102-- in a first narrow side --103-- (S. also Fig.7). Opposite them openings lie --103,104-- in a second narrow side --106-- (S. also Fig.8), those the lines --79 and/or 62--by second (58) and third connections (59) are assigned. The openings --101,102 and 103,104-- lie symmetrically to a transverse axis of the step plate --95--, around a surface mounting of several of such plates on with their narrow sides --103,106-- to make possible. The step plate --95-- points for this purpose furthermore two drillings --107,108-- for tie rods up. Furthermore are for fastening the Negeventils --53-- four tapped holes (109) into the flange surface --96-- brought in. Einsenkungen --110-- take up sealing rings. Necessary openings are not locked as usual with plugs. Fig.9 shows as part of the preparation stage --11-- a connection plate --115-- in plan view, on those first (51) and second Negeventil --52-- are flanged. Same parts as in Fig.2 are provided with same reference symbols. I0 the connection plate --115-- (Fig.10) is quaderförmig and points at a flange surface --116-- the connections --57,58,59,61,62,64-- for the first ski selector valve --51-- and the connections --57,58,59,61,62,63,64-- for the second ski selector valve --52-- up. On a opposite surface area --117-- (S. Fig. 10) are the setting impulse entrance --16--, the start input (El) --22-- and the reconducting signal input tER) --118-- the first ski selector valve --51-- assigned, during the fluid supply entrance (P) and the signal output (M1) --43-- the second ski selector valve --52-- are assigned. Furthermore the ports (R, S) lead --61,62-- the second ski selector valve --52-- over openings --119,121-- outward. In the connection plate --11S-- lead the lines designed as channels --68, 69, 24 ' and 71-- of the entrances in the sequence for the connections, mentioned before --57 (P), 61 (R), 64 (Z) and/or 62 (s)-- the first ski selector valve --51--. From the latter the lines lead --73,74-- of the connections --58 (A) and/or 59 (B)-- for the connections --64 (Z) and/or 63 (Y)-- the second ski selector valve --52--, its P connection --57-- over the line --75-- with the fluid supply entrance --72-- is connected. The connections --58 APPROX.) and 59 (B)-- are by parts of the lines --76 and/or 78-- with openings --122 and/or 123--in a narrow side --124-- the connection plate --115-- connected, to which the Sehrittplatte --95-- with their narrow side --103-- is flange onable, so that line parts have connection with same reference symbols with one another. The connection plate --115-- has according to the step plate --95-- Drillings --125,126-- for tie rods and eight tapped holes --127-- to fastening the two ski selector valves --51, 52--. Did not need drilling openings in the connection plate --115-- by plugs are locked. Of course it is possible, for changes at the sequencer --10--to make to deviate without of the thought of the invention. So the sequencer can --10-- also without final stage --15-- are implemented and then can from the last signal output A3 a reconducting signal to the preparation stage be derived.