SE463884B

SE463884B - PNEUMATIC OR HYDRAULIC CYLINDER WITH BUILT-IN SPEED CONTROL

Info

Publication number: SE463884B
Application number: SE8604813A
Authority: SE
Inventors: S R Koermark
Original assignee: Hydro Pneumatic Ab
Priority date: 1986-11-10
Filing date: 1986-11-10
Publication date: 1991-02-04
Also published as: SE8604813D0; AU8271287A; EP0362201A1; WO1988003609A1; FI892218A0; SE8604813L; FI892218A

Description

4es ss4 , En för närvarande föredragen utföringsform av uppfinningen beskrives närmare i det följande i anslutning till bifogade ritningar, där fig. 1 - 5 visar denna utföringsform i olika vyer och snitt, medan fig. 6 visar ett alternativt utförande av den i själva anslutningsporten vid respektive gavel inbyggda back-funktionen. 4es ss4, A presently preferred embodiment of the invention is described in more detail below in connection with the accompanying drawings, where Figs. 1 - 5 show this embodiment in different views and sections, while Fig. 6 shows an alternative embodiment of it in the connection port itself at each end built-in back function.

Såsom framgår tydligast av fig. 2 utföres anslutningsporten 1 vid respektive gavel hos cylindern i den för närvarande föredragna utförings- formen av uppfinningen med sin cylindriska del Ia så långt ned så att endast någon eller några millimeter gods 2 återstår ned till respektive cylinder- kammare 3, där övergång sker (i det tunna godset 2) genom ett antal, exempel- vis fyra mindre hål 2a - 2d, eller genom någon lämplig alternativ utformning för mediepassage, som förhindrar den i back-funktionen ingående kulan 4 att passera ut i cylinderkammaren 3, men som ändå ger möjlighet för mediet att passera ut till cylinderkammaren. Den i respektive anslutningsport l ingående kulan 4 förhindrar mediet att passera i motsatt riktning genom att kulan tätar mot ett i anslutningsporten iskruvat ventilsäte 5.As can be seen most clearly from Fig. 2, the connection port 1 is made at respective end of the cylinder in the presently preferred embodiment the shape of the invention with its cylindrical part Ia so far down that only one or a few millimeters of goods 2 remain down to the respective cylinder chamber 3, where transition takes place (in the thin material 2) through a number of show four smaller holes 2a - 2d, or by any suitable alternative design for media passage, which prevents the ball 4 included in the back function from pass out into the cylinder chamber 3, but which still allows the medium to pass out to the cylinder chamber. The one included in the respective connection port l the ball 4 prevents the medium from passing in the opposite direction by the ball seals against a valve seat 5 screwed into the connection port 5.

Eftersom arbetscylindrar är strikt normerade beträffande utvändig storlek på cylindergavlarna, står ett mycket begränsat utrymme till buds för att bygga in en backventilfunktion direkt i anslutningsporten vid respektive gavel.Because working cylinders are strictly standardized in terms of exterior size of the cylinder heads, a very limited space is available to install a non-return valve function directly in the connection port at the respective gable.

Vid cylindern enligt föreliggande uppfinning - arbetar backfunktionen utan att kulan 4 påverkas av en fjäder såsom är fallet i tidigare kända lösningar, vilket enligt uppfinningen möjliggöres genom att i en föredragen utföringsform ventilsätet 5 för kulon 4 skruvas ned till ett fixerat läge så att kulans rörelse blir så liten att kulan tätar snabbt och funktionssäkert mot sätet utan att kulan behöver påverkas av en fjäder, oberoende av hur cylindern är monterad; - en förhållandevis liten kula 4 användes och att skillnaden mellan kul- diametern och diametern hos hålet 5a i ventilsätet 5 är liten för att ge en så stor genomströmningsarea som möjligt; här bör nämnas att kulan företrädes- vis år utförd i ett lämpligt plastmaterial för att den inte skall tränga igenom hålet i ventilsätet 5 (med tanke på den ovannämnda ringa diameter- skillnaden) och för att samtidigt kulan skall vara så lätt att den snabbt och säkert går uppåt för att stänga medie-passagen genom sin anliggning mot ventilsätet; - anslutningsporten 1 i respektive gavel år så utförd att dess cylind- riska del la går ända ned till dess det endast återstår någon eller några millimeter gods 2 till cylinderkammaren 3, där övergången sker genom ett antal, där fyra mindre hål Za - 2d (annat antal är självfallet också möj- 463 884 3 ligt), eller genom någon annan lämplig utformning som förhindrar kulan 4 att gå ut i cylinderkammaren 3, men som samtidigt ger mediet möjlighet att passera ut till cylinderkammaren.At the cylinder of the present invention - the reverse function works without the ball 4 being affected by a spring as is the case in previously known solutions, which according to the invention is made possible by screwing down the valve seat 5 for ball 4 in a preferred embodiment to a fixed position so that the movement of the ball becomes so small that the ball seals quickly and functionally against the seat without the ball having to be affected by one spring, regardless of how the cylinder is mounted; a relatively small ball 4 was used and that the difference between the diameter and the diameter of the hole 5a in the valve seat 5 is small to give one as large flow area as possible; it should be mentioned here that the ball is made in a suitable plastic material so that it does not penetrate through the hole in the valve seat 5 (in view of the above-mentioned small diameter difference) and that at the same time the bullet should be so light that it quickly and certainly goes up to close the media passage through its abutment against the valve seat; the connecting port 1 in each end is so designed that its cylinder risk part la goes all the way down until there is only one or a few left millimeters of goods 2 to the cylinder chamber 3, where the transition takes place through a number, where four smaller holes Za - 2d (other number is of course also possible 463 884 3 or by any other suitable design which prevents the ball 4 from go out into the cylinder chamber 3, but which at the same time gives the medium the opportunity to pass out to the cylinder chamber.

Ytterligare vunna fördelar med en enligt uppfinningen i själva anslut- ningsporten till cylindern i respektive gavel inbyggd bockfunktion är: - ingen separat pluggning erfordras för detta ändamål; - ett mindre antal kanaler erfordras Vid mediets strömning ut ur respektive cylinderkammare 3 skall flödet passera en strypning, vilken är justerbar för att möjliggöra inställning av cylinderns kolvhastighet. I hittills kända utföranden åstadkommes detta genom att i en yttre kanal till cylinderkammaren placera en strypskruv och förbinda strypningens andra sida med anslutningsporten med ytterligare en yttre kanal som måste pluggas. I den hastighetsreglerade pneumatik- eller hydraulcylin- dern i enlighet med föreliggande uppfinning sker förbindelsen från cylinder- kammaren 3 efter strypningen 6, också här i form av en strypskruv 6a, till anslutningsporten 1 via en inre kanal 7, vilken är utformad så att den går lätt att pressgjuta utan extra kärndragning. Den erforderliga avtätningen av denna kanal 7 mot cylinderkammaren 3 vid respektive gavel sker företrädesvis medelst en i kanalens 7 mot kolven vettande mynning inpassad, utskjutande del 8a på en bricka 8, företrädesvis sprutad i plast, som förutom nämnda avtät- ning ocksâ svarar för ytterligare funktioner i cylindern såsom, - tätning_mellan respektive cylindergavel 9 och cylinderröret 10; - styrning av cylinderröret 10 i respektive gavel 9; - förhindrar att den på konventionellt vis ingående dämptätningen 11 i cylindern vid respektive gavel går ut i cylinderkammaren 3; - fungerar även såsom mekanisk dämpning för kolven 12 i dess ändlägen.Further advantages of a according to the invention in the connection itself The bending function of the cylinder in the respective end built-in bending function is: no separate plugging is required for this purpose; a smaller number of channels is required When the medium flows out of the respective cylinder chamber 3, the flow shall pass a throttle, which is adjustable to allow adjustment of cylinder piston speed. In hitherto known embodiments this is achieved by to place a throttle screw in an outer channel to the cylinder chamber and connect the other side of the choke with the connection port with an additional outer channel which must be plugged. In the speed-controlled pneumatic or hydraulic cylinder In accordance with the present invention, the connection is made from the cylinder the chamber 3 after the choke 6, also here in the form of a choke screw 6a, to the connection port 1 via an inner channel 7, which is designed so that it runs easy to die cast without extra core drawing. The required sealing of this channel 7 towards the cylinder chamber 3 at the respective end end preferably takes place by means of a projecting part fitted in the mouth of the channel 7 facing the piston 8a on a washer 8, preferably sprayed in plastic, which in addition to said sealant is also responsible for additional functions in the cylinder such as, seal between the respective cylinder head 9 and the cylinder tube 10; - control of the cylinder tube 10 in the respective end wall 9; prevents the damping seal 11 i the cylinder at each end ends in the cylinder chamber 3; also acts as a mechanical damping for the piston 12 in its end positions.

Med 13 i figurerna anges för fullständighetens skull en konventionell, på känt sätt anordnad justerskruv för inställning av lämplig dämpning i cylindern, vilken funktion i sig saknar relevans för föreliggande uppfinning.With 13 in the figures, for the sake of completeness, a conventional, adjusting screw arranged in a known manner for setting the appropriate damping in the cylinder, which function in itself is irrelevant to the present invention.

Fig. 6a - 6c visar ett alternativt utförande av den enligt uppfinningen i själva anslutningsporten inbyggda back-funktionen i cylindern, där man istället för den i övriga figurer visade kulan 4 och hålen 2a - 2d valt att utnyttja en konformad ventilkropp 14 samverkande med ventilsätet 5. Denna ventilkropp är utförd med en centralt utskjutande tapp-formad del 14a, vilken vid sin fria ände är fast förbunden med ett av ett antal, här fyra, vinkel- rätt mot ventilkroppens 14 centrumlinje och här radiellt i kors-form anord- nade ben 14b - l4e bestående parti, vilket vid sin anliggning mot ventilsätet 5, då mediet strömmar in i anslutningsporten 1 medger passage av mediet in i cylinderkammaren 3 i utrymmena mellan benen 14b - 14e (se Fig. 6b), men 465 884 a 4 viiket samtidigt genom ansiag mot "baksidan" av ventilsätet 5 hâiier kvar ventiïkroppen 14 så att den ej bringas med av mediet in i cyiinderkammaren 3 i cyiindern.Figs. 6a - 6c show an alternative embodiment of it according to the invention in the connection port itself built-in back function in the cylinder, where one instead of the ball 4 shown in the other figures and the holes 2a - 2d chosen to utilize a cone-shaped valve body 14 cooperating with the valve seat 5. This valve body is made with a centrally projecting pin-shaped part 14a, which at its free end is fixedly connected to one of a number, here four, angular right towards the center line of the valve body 14 and here radially in cross-shape arranged nade leg 14b - l4e existing portion, which when abutting the valve seat 5, when the medium flows into the connection port 1 allows passage of the medium into the cylinder chamber 3 in the spaces between the legs 14b - 14e (see Fig. 6b), but 465 884 a 4 at the same time folding towards the "back" of the valve seat 5 hâiier left the valve body 14 so that it is not brought by the medium into the cylinder chamber 3 in cyiindern.

Föreiiggande uppfinning är ej begränsad tiil de ovan beskrivna och på ritningarna visade utföringsformerna utan ett fïertai andra varianter är också möjiiga inom ramen för uppfinningstanken.The present invention is not limited to those described above and on the drawings show the embodiments without a fiertai other variants are also possible within the scope of the inventive concept.

Claims

463,884 Claims

Pneumatic or hydraulic cylinder comprising a connection port (1) in at least one cylinder end in connection with the cylinder chamber via a non-return valve device (2,4,5,), for supply and removal of working medium into resp. out of the respective cylinder chamber (3) and a throttle valve device (6, 6a) for speed control, characterized in that the connection port (1) forms a substantially straight connection directly to the cylinder chamber, a first inner part of the connection port communicating with the cylinder chamber (3 ) via the non-return valve device (2,4,5), which comprises a valve body (4) which is arranged to move substantially in the longitudinal direction of the door when the medium flows into the cylinder chamber (3) through the action of the medium to cooperate with a transition between said first inner part of the connection port (1) and the cylinder chamber forming first wall (2), which is designed to, on the one hand, prevent the valve body from passing out into the cylinder chamber and, on the other hand, allow the inflow of the working medium into the cylinder chamber with low flow resistance, while the valve body, when the medium flows out of the cylinder chamber by the action of the medium, moves in the opposite direction substantially in the port longitudinally to cooperate with a valve seat (second) inserted through the connection port, forming a second seat (5) located between said first inner part and an outer part of the connection port arranged in line therewith for blocking the outflow of the working medium to this outer part.

Pneumatic or hydraulic cylinder according to Claim 1, characterized in that the valve body is designed as a ball (4) and in that the distance between the first and the second wall (2 and 5, respectively) only slightly exceeds the diameter of the ball (4) to minimize the required movement of the ball between its two working positions.

Pneumatic or hydraulic cylinder according to claim 2, characterized in that the first wall (2) has a number of smaller holes (2a-2d), each of which has a diameter which is considerably less than the diameter of the ball (4).

Pneumatic or hydraulic cylinder comprising a connection port (1) in at least one cylinder end in connection with the cylinder chamber via a non-return valve device (14) for supplying and removing working medium into resp. out of the respective cylinder chamber (3), and a throttle valve device (6,6a) for speed control, characterized in that the connecting port (1) forms a substantially straight connection directly to the cylinder chamber, a first, inner part of the connecting port being connected with the cylinder chamber (3) via the non-return valve device (14), which comprises a conical valve body (14), which is arranged to move substantially in the longitudinal direction of the port when cooperating with the medium through the action of the medium through the action of the medium. the connection port (1) is inserted, a valve seat forming wall (5), located between said first inner part of the connection port and an outer part thereof in line with the inner part for blocking the outflow of the working medium to this outer part, and that the valve body is arranged to upon the inflow of the medium into the cylinder chamber (3) by the action of the medium move in the opposite direction substantially in the longitudinal direction of the port to occupy a open position, in which inflow takes place with low flow resistance and in which a locking member (14a-e) connected to the valve body which is permeable to the working medium engages with the seat (5) to prevent the valve body from passing out into the cylinder chamber.

Pneumatic or hydraulic cylinder according to claim 4, characterized in that said locking means comprises a pin-shaped part (14a), which from the smaller end surface of the valve body (14) extends through the valve opening and at its end has perpendicular to the pin part, crosswise arranged legs (14b-e) to limit the movement of the valve body by engaging the valve seat (5).

Pneumatic or hydraulic cylinder according to one of the preceding claims, characterized in that an adjustable throttle valve device (6, 6a) is arranged in a second, inner part of the connection port (1), which is designed to enable a variable degree of outflow of the working medium out of the cylinder chamber to said outer part of the connecting port depending on the desired working speed of the cylinder, said second, inner part of the connecting port (1) communicating with the outer part of the connecting port via an inner channel extending substantially in the longitudinal direction of the cylinder. (7) in the cylinder end, the orifice of which is directed towards the associated cylinder chamber (3), in the direction of the piston (12) in the cylinder, is sealed by means of a sealing body (8a) adapted to said orifice. VP