DK173997B1

DK173997B1 - Control mechanism for valves for simultaneous supply of different plastic components to the mixing chamber in a mixing head

Info

Publication number: DK173997B1
Application number: DK199200413A
Authority: DK
Inventors: Klaus Pontius; Manfred Settinger
Original assignee: Kloeckner Desma Schuhmaschinen
Priority date: 1991-03-28
Filing date: 1992-03-27
Publication date: 2002-04-02
Also published as: GB9206448D0; DK41392D0; ITMI920286A1; ITMI920286A0; FR2674475A1; GB2254132A; FR2674475B1; DE9103853U1; GB2254132B; DK41392A; IT1254782B

Description

i DK 173997 B1 Nærværende opfindelse angår en styremekanisme for ventiler til samtidig tilførsel af forskellige plastkomponenter til blandekammeret i et blandehoved, hvor hver ventil har en ventilstang til at åbne og lukke for plasttilførslen, og 5 ventilstængerne parvis er forbundet med et dobbeltløftestangssystem, idet den udvendige ende af hver løftestangsarm er forbundet med den tilhørende ventilstang i hver sin ventil i ventilparret, og de indvendige ender af de to løftestangsarme er drejeligt forbundne med et stempel eller en stempel-10 stang, hvis bevægelse sker ved hjælp af en fluidumbetjent cylinder, hvis stempel samtidigt påvirker begge løftestangsarme .The present invention relates to a control mechanism for valves for simultaneously supplying different plastic components to the mixing chamber in a mixing head, each valve having a valve rod for opening and closing the plastic supply, and the 5 valve rods being connected in pairs to a double lever system, the exterior the end of each lever arm is connected to the associated valve rod in each valve of the valve pair, and the inner ends of the two lever arms are pivotally connected to a piston or piston rod, the movement of which is effected by a fluid operated cylinder whose piston simultaneously affecting both leverage arms.

Ved en styremekanisme af den i indledningen nævnte art er 15 det kendt at tilføre to plastkomponenter samtidigt ved betjening af dobbeltløftestangssystemet. Dette system er imidlertid begrænset til samtidig tilførsel af to komponenter og tillader kun betjening af et ventilpar, hvilket især er en ulempe, når eksempelvis tre plastkomponenter skal tilføres 20 samtidigt til blandekammeret, og tilførslen skal holdes nøjagtigt synkron ved tvangsstyring af komponenttilførslen.By a control mechanism of the kind mentioned in the preamble, it is known to supply two plastic components simultaneously when operating the double lever system. However, this system is limited to simultaneous supply of two components and only allows the operation of a valve pair, which is a disadvantage when, for example, three plastic components must be supplied simultaneously to the mixing chamber and the supply must be kept exactly synchronous when forced control of the component supply.

Nærværende opfindelse har nu til hensigt at videreudvikle den i indledningen nævnte styremekanisme, således at den 25 samtidigt kan tilføre mere end to plastkomponenter eller, blandt adskillige komponenter, kan udvælge to eller flere komponenter og tilføre disse synkront.The present invention now intends to further develop the control mechanism mentioned in the introduction so that it can simultaneously supply more than two plastic components or, among several components, select two or more components and supply them synchronously.

Dette opnås ifølge opfindelsen ved, at indrette den indled-30 ningsvis nævnte styremekanisme sådan, at der til styring af i det mindste to naboventilpar mellem hvert af de ventilpar, der skal styres, er anbragt et dobbeltløftestangssystem, og at den mellem to dobbeltløftestangssystemer liggende ventilstang fører de indvendige ender i dobbeltløftestangssyste-35 met på en sådan måde langs ventilstangen, at de, ved betjening af dobbeltløftestangssystemerne i samme retning bevæger DK 173997 B1 2 sig i samme retning og ved betjening af de samme i indbyrdes modsat retning bevæger sig modsat hinanden og derved i begge bevægelsestilfælde bevæger ventilstangen til åbning af ventilen .This is achieved according to the invention by arranging the control mechanism mentioned in the introduction so that a double lift rod system is arranged for controlling at least two adjacent valve pairs between each of the valve pairs to be controlled, and the valve rod lying between two double lift rod systems. leading the inner ends of the double lever system in such a way along the valve rod that when operating the double lever systems in the same direction they move in the same direction and by operating the same in opposite directions and move opposite each other and thereby, in both cases of movement, the valve rod moves to open the valve.

55

Ifølge en udførelsesform for opfindelsen er føringen for de indvendige ender af dobbeltløftestangssystemerne udformet som et langhul i ventilstangen, som strækker sig langs ventilstangen, idet de trinformet udformede indvendige ender 10 indgriber i langhullet fra begge sider, og vinkelret på langhullets ligger ved siden af hinanden i dette, og hvor de indvendige ender ved betjening af de tilstødende dobbeltløftestænger i samme retning overlapper hinanden fuldstændigt, og ved modsat betjening overlapper delvis.According to an embodiment of the invention, the guide for the inner ends of the double lever systems is formed as a long hole in the valve rod extending along the valve rod, the step-shaped inner ends 10 engaging in the long hole from both sides and perpendicular to the long hole lying next to each other. this, and where the interior ends of operation of the adjacent double lift rods in the same direction completely overlap, and by opposite operation partially overlap.

1515

Ifølge en anden udførelsesform kan de indvendige ender af dobbeltløftestangssystemerne indgribe i to adskilte langhuller i ventilstangen eller være forsynet med ansatser, som indgriber i riller eller noter i ventilstangen, hvilket 20 tillader en bevægelse af enderne parallelt med ventilstangens akse.According to another embodiment, the inner ends of the double lever systems may engage two separate long holes in the valve rod or be provided with abutments engaging grooves or grooves in the valve rod, allowing movement of the ends parallel to the axis of the valve rod.

Ved anvendelse af blot et enkelt fælles langhul kan de indvendige løftestangsender være udformet som trinformede an-25 satser, hvis tykkelse er formindsket med bredden af et trin i forhold til løftestangstykkelsen, idet de indvendige ender mellem trinene indvendigt i langhullet ligger ved siden af hinanden.By using only a single common long hole, the inner lever ends may be formed as step-shaped joints whose thickness is reduced by the width of one step relative to the leverage thickness, the inner ends between the steps inside the long hole being adjacent to each other.

30 Opfindelsen har den fordel, at som ved den kendte ventilstyring af den i indledningen nævnte art sikres også en tvangsstyring af tilførslen af plastkomponenter i forbindelse med tre eller flere komponenter, og en væsentligt større variationsbredde muliggøres ved udvælgelse blandt adskillige 35 komponenter, idet også et ulige antal komponenter kan tilføres synkront.The invention has the advantage that, as in the known valve control of the kind mentioned in the preamble, a forced control of the supply of plastic components in connection with three or more components is also ensured, and a significantly greater variation width is possible by selecting from several 35 components, also a odd number of components can be supplied synchronously.

DK 173997 B1 3DK 173997 B1 3

Opfindelsen forklares nærmere ved hjælp af nogle udførel-seseksempler under henvisning til tegningen, hvor 5 fig. 1 skematisk viser et første udførelseseksempel ifølge opfindelsen i et tværsnit vinkelret på blandingskammeraksen, fig. 2 er en perspektivisk fremstilling af det i fig. 1 viste udførelseseksempel, 10 fig. 3 viser i forstørret målestok og perspektivisk det i fig. 1 med I betegnede punkteret indcirklede udsnit, fig. 3' et forstørret snitbillede af detaljer skåret vinkel-15 ret på ventilstangsaksen, og fig. 4 viser et andet udførelseseksempel ifølge opfindelsen.The invention will be explained in more detail with the aid of some exemplary embodiments with reference to the drawing, in which: FIG. 1 schematically shows a first embodiment of the invention in a cross-section perpendicular to the mixing chamber axis; FIG. 2 is a perspective view of the embodiment of FIG. 1, FIG. 3 shows, on an enlarged scale and in perspective, that of FIG. 1 with dotted circular sections, designated in FIG. 3 'is an enlarged sectional view of details cut at right angles to the valve stem axis; 4 shows another embodiment of the invention.

I fig. 1 er vist ventilerne Al, B og A2, hvormed tilførslen 20 af tre forskellige plastkomponenter gennem kammervæggen 2 til det som central udboring udformede blandekammer 1 styres.In FIG. 1, the valves A1, B and A2 are shown, which control the supply 20 of three different plastic components through the chamber wall 2 to the central bore mixing chamber 1.

I det efterfølgende bliver plastkomponenterne betegnet Al, B og A2 som deres tilhørende ventiler, hvormed tilførslen af disse komponenter styres.Hereafter, the plastic components are designated A1, B and A2 as their associated valves by which the supply of these components is controlled.

25 I ventilerne A1,B,A2 er ventilstænger SA1, SB og SA2 lejret i akseretningen. Lukkebevægelsen, som sker indad i retning mod blandingskammeret, opnås ved hjælp af fjedre F, som er anbragt indvendigt i ventilhusene, og hvor kun den i ventilen 30 B viste fjeder er anskueliggjort. Åbningsbevægelsen af ventilstangen sker ved hjælp af dobbeltløftestangssystemerne Cl og C2. I den forbindelse indgriber de indvendige ender af de to løftestænger Hl og H2 i den første dobbelt løftestang Cl med stempel stangen KAI og de to indvendige ender af de 3 5 to løftestænger H3 og H4 i dobbelt systemet C2 med stempelstangen KA2 i et stempelcylinderdrev og er ledformet lejrede DK 173997 B1 4 i disse stempel stænger.25 In valves A1, B, A2, valve rods SA1, SB and SA2 are mounted in the axial direction. The closing movement, which occurs inwardly towards the mixing chamber, is achieved by springs F which are arranged internally in the valve housings and where only the spring shown in the valve 30 B is shown. The opening of the valve rod is effected by means of the double lever systems C1 and C2. In this connection, the inner ends of the two levers H1 and H2 in the first double lever Cl with the piston rod KAI and the two inner ends of the two levers H3 and H4 in the double system C2 with the piston rod KA2 in a piston cylinder drive and are joint-shaped enclosed DK 173997 B1 4 in these piston rods.

Åbningsbevægelsen for dobbeltsystemet Cl og/eller C2 opnås så, ved at trykluft tilføres i cylinderen Z1 og/eller Z2, 5 hvilket trykker stemplerne Kl og det ikke viste stempel K2 og dermed stempelstængerne KAI og KA2 indad. Derved bliver de to løftestænger Hl og H2 i det første løftestangssystem Cl drejet omkring lejringsakslerne LI og L2, medens dob-beltløftestængerne H3 og H4 svinges om lejringsakslerne L3 10 og L4 i dobbeltløftestangssystemet C2. Derved forskydes de to løftestængers Hl og H2 udvendige ender sig ved betjening af trykluftcylinderen Z1 i dobbeltløftestangssystemet Cl, hvorved ventilstængerne SA1 og SB bevæges udad til åbning af den tilhørende ventil. Dette resulterer i, at ved betjening 15 af dobbeltløftestangssystemet Cl åbnes samtidigt for plastkomponenterne Al og B, og ved betjening af dobbeltsysternet C2 åbnes samtidigt for plastkomponenterne B og A2, og de tilsvarende komponenter når samtidigt til blandingskammeret 1.The opening movement of the dual system C1 and / or C2 is then achieved by supplying compressed air in the cylinder Z1 and / or Z2, which presses the pistons K1 and the piston K2 not shown, and thus the piston rods KAI and KA2 inward. Thereby, the two levers H1 and H2 of the first lever system C1 are rotated about the bearing shafts L1 and L2, while the double levers H3 and H4 are pivoted about the bearing shafts L3 10 and L4 in the double lever system C2. Thereby, the outer ends of the two levers H1 and H2 are displaced by operating the compressed air cylinder Z1 in the double lever system C1, whereby the valve rods SA1 and SB are moved outwards to open the associated valve. This results in the operation of the double lever bar system C1 being simultaneously opened for the plastic components A1 and B, and the operation of the double system C2 simultaneously opened for the plastic components B and A2, and the corresponding components simultaneously reach the mixing chamber 1.

2020

De to ender El henholdsvis E2 i dobbeltløftestangssystemerne Cl henholdsvis C2 indgriber i et langhul L fra de to modstående sider af ventilstangen SB med denne, hvorved de, som det ses i fig. 3, vinkelret på langhulsretningen ligger ved 25 siden af hinanden og overlapper hinanden. Når begge dob-beltløftestangssystemer Cl og C2 betjenes samtidigt, bevæger de indvendige ender El og E2 i de to dobbeltløftestangssys-temer sig i samme retning opad og skubber ventilstangen SB i den åbne stilling, således at der ud over komponenterne 30 Al og A2 også tilføres plastkomopnenten B til blandingskammeret ved åbning af alle tre ventiler. Bliver nu et løftestangssystem eksempelvis Cl styret til ventilåbning, så sker åbningen af ventilen B kun via den indvendige ende El, som så bevæger sig modsat den indvendige ende E2, som for-35 bliver i den stilling, hvori dobbeltløftestangssystemet C2 befinder sig, som af fjederen holdes i den lukkede stilling.The two ends E1 and E2, respectively, in the double lever rod systems C1 and C2, respectively, engage in a long hole L from the two opposite sides of the valve rod SB with the latter, whereby as seen in FIG. 3, perpendicular to the long-hole direction lies at 25 side by side and overlaps. When both dual lever systems C1 and C2 are operated simultaneously, the inner ends E1 and E2 of the two double lever systems move in the same direction upward and push the valve rod SB in the open position so that in addition to the components 30 A1 and A2 the plastic component B to the mixing chamber by opening all three valves. If a lever system, for example, C1, is controlled for valve opening, then the opening of valve B occurs only via the inner end E1, which then moves opposite to the inner end E2, which remains in the position in which the double lever system C2 is located by the spring is held in the closed position.

DK 173997 B1 5DK 173997 B1 5

Alt i alt fås en mulighed for ved betjening af blot et enkelt dobbeltløftestangssystem at tilføre to komponenter, altså Al og B, henholdsvis A2 og B, eller ved betjening af begge 5 dobbeltløftestangssystemer, altså deres overføring til åbningnsstillingen for ventilerne, at tilføre alle tre komponenter Al, B og A2 samtidigt. Langhullet L skal i den forbindelse have en længde, der er tilstrækkelig til den modsatte bevægelseslængde for enderne El og E2. I den for-10 bindelse skal imidlertid trinbredden af enderne El og E2 være så stor, at de ved siden af hinanden liggende trin stadig overlapper, også når de to indvendige ender er i de modstående ydre stillinger, altså når et af dobbeltløftestangssystemerne befinder sig i åben stilling, og det andet 15 af dobbelt løftestangssystemerne befinder sig i den lukkede stilling. Dette svarer til det tilfælde, at kun ét af dobbelt systemerne gennemfører samtidig tilførsel af to plast-komponenter.All in all, it is possible to supply all three components by operating only a single double lever system, ie Al and B, respectively A2 and B, or by operating both 5 double lever systems, ie their transfer to the opening position of the valves. Al, B and A2 simultaneously. The long hole L must in this connection have a length sufficient for the opposite length of movement of the ends E1 and E2. In this connection, however, the step width of the ends E1 and E2 must be so large that the adjacent steps still overlap, even when the two inner ends are in the opposite outer positions, ie when one of the double lever systems is in open position and the other 15 of the double lever systems are in the closed position. This corresponds to the case that only one of the dual systems conducts the simultaneous supply of two plastic components.

20 For at kunne holde bredden af langhullet L så lille som muligt, anbefales det, at formindske enderne El og E2 i forhold til løftestængerne ved hjælp af et trin, som det er sket ved hjælp af de to trin TI og T2, som det ses i den perspektiviske tegning i fig. 3 og 3'.In order to keep the width of the long hole L as small as possible, it is recommended to reduce the ends E1 and E2 with respect to the levers by means of a step, as has been done by the two steps T1 and T2 as seen. in the perspective drawing of FIG. 3 and 3 '.

2525

Ved den i fig. 1 viste udførelsesform er endnu yderligere to ventiler Fl og F2 vist. Ved hjælp af disse enkeltvis styrbare ventiler tilføres eksempelvis farvekomponenter til blandingskammeret. En sådan anordning kan især vælges, når 30 synkroniseringen af tilførslen af farvekomponenter ikke er særlig kritisk.In the embodiment shown in FIG. 1, two further valves F1 and F2 are shown. By means of these individually controllable valves, for example, color components are supplied to the mixing chamber. Such a device can be selected especially when the synchronization of the supply of color components is not very critical.

En yderligere udførelsesform for opfindelsen er anskuelig-gjort i fig. 4. Her er de seks viste ventiler VI til V6 35 opdelt i to 180° forskudte grupper, hvis funktionsmåde svarer til treventilgruppen ifølge fig. 1. De til fig. 1 svarendeA further embodiment of the invention is illustrated in FIG. 4. Here the six valves VI to V6 35 shown are divided into two 180 ° offset groups, the operation of which corresponds to the three valve group according to fig. 1. 1 respondent

Claims

A control mechanism for valves for simultaneously supplying different plastic components to the mixing chamber in a mixing head, each valve having a valve rod for opening and closing the plastic supply, and the valve bars connected in pairs to a double lever system, the outer end of each lever arm being connected with the associated valve rod in each valve in the valve pair, and the inner ends of the two levers are pivotally connected to a piston or piston rod, the movement of which is effected by a fluid actuated cylinder whose piston simultaneously affects both levers, that a double lever bar system (C1, C2) is arranged between two adjacent valve pairs (A1, B; A2, B) for controlling at least 15 and that the valve bar (SB ) leads the inner ends (E1, E2) of the double lever system (C1, C2) in such a manner along 20 friends the lever (SB) means that, when operating the double lever systems in the same direction, they move in the same direction, and, when operating the same in opposite directions, move in opposite directions, thereby opening the valve rod (SB) in both cases. 25

Steering mechanism according to Claim 1, characterized in that the inner ends (E1, E2) of the double lever system (C1, C2) engage in a long hole (L) extending in the direction of the valve rod (SB), the stepform forming 30 inner ends. (E1, E2) perpendicular to the longitudinal direction of the long hole lies adjacent to each other and the ends (E1, E2), when operated in the same direction, completely overlap, and by opposite movement of the ends partially overlap. 35

Control mechanism according to claim 1, characterized in that the guide which serves to displace the inner ends (E1, E2) consists of two parallel, separate long holes, each of the inner ends (E1, E2). ) intervenes slidably in. 5

Steering mechanism according to claim 1, characterized in that the inner ends (E1, E2) are provided with abutments or pins which engage longitudinal grooves in the valve rod. 10

Steering mechanism according to claim 2, characterized in that the inner ends (E1, E2) of the double lever system (C1, C2) are formed as step-shaped abutments whose thickness is reduced by the width of a step (T1, T2) relative to the thickness of the lever arm and that the inner ends between the steps (T1, T2) can be displaced internally in the long hole in the same and opposite directions.