EP0964165A2 - Pneumatic cylinder for actuating an adjustable element - Google Patents

Abstract

The compressed air cylinder assembly, for setting adjustable units, has profiles (19,20) along the outside of the cylinder tube (3), in a T-shaped cross section with a web and flange. Each profile has a passage drilling (29,30) sealed at both ends, as components of the connection for the compressed air. A clamping profile (35) grips round the profiles (19,20) and at least a peripheral mantle section of the cylinder tube (3), and a longitudinal tube mantle section, containing the compressed air connection.

Description

The invention relates to an air cylinder for actuation an adjustable element, in particular a smoke flap in a smoke and heat exhaust system, according to the generic term of claim 1.

In general, the invention relates to both simple compressed air cylinders, in which a double-sided piston by the pressure of the Pressure medium in one of the cylinder spaces adjacent to the piston held in one of two possible end positions is, as well as preferably a compressed air cylinder with a locking device, which reached an end position of the piston and the piston rod connected to it even in the absence of Pressure holds. In addition, the invention can be used with Double stroke cylinders, in which except the two end positions the piston rod at least one not fully extended position the piston rod is adjustable. The latter is through an additional locking piston controlled with a reversing valve reached, which is displaceable coaxially to the piston rod and limited a partial stroke of the piston rod (EP 0 363 575 A1). At These air cylinders generally require that Pressure medium, i.e. Compressed air, controlled by one or the other other cylinder space and - with an existing locking device - The bolt pressure space adjacent to the cylinder space feed from two pressure medium connections. Here can the reversing valve for the double stroke cylinder neighboring bolt pressure chamber can be supplied with compressed air. The pressure medium connections can be threaded blind holes especially in a cylinder head or in an opposite one Be bored cylinder bottom. At least one of the two Blind holes can be made through a cross hole with a cylinder pressure chamber keep in touch. Two with these pressure medium connections connected pressure medium connection fittings one Compressed air line can also be used for swiveling suspension of the air cylinder. If the cylinder head and the cylinder base on the compressed air cylinder is interchangeable , it is sufficient to connect the two pressure medium connections the cylinder head or the cylinder base to provide depending on the arrangement of the cylinder head and the cylinder bottom in the Compressed air cylinder a suspension optionally in the upper part or in the lower part of the air cylinder.

These two ways of suspending the cylinder are but in practice not always sufficient, rather it can be desirable to use the air cylinder in intermediate positions, especially in the middle, hang up and over to supply pressure to the suspension.

If the two pressure medium connections are only in the cylinder head or the cylinder bottom, the pressure medium depending on its control in the two lines that over Pressure medium connection fittings in the pressure medium connections open, either from a pressure medium connection via holes in the cylinder head or cylinder bottom the neighboring one Piston chamber and possibly bolt pressure chamber are supplied or is from the other pressure medium connection via an additional one fluid-conducting connection section to the to supply distant piston chamber and bolt pressure chamber. At a double tube cylinder is the additional pressure medium Connection section through the space between a double tube formed as a cylinder, but a considerable additional mass represents. Alternatively, one of the pressure medium connections via an additional outer line with the remote Piston chamber can be connected to the bolt pressure chamber. This however requires increased assembly effort.

It is also already known on the cylinder of a piston-cylinder unit outside two in the longitudinal direction Profiles with an approximately T-shaped cross section with a Form web and a flange, each profile one Has through hole (DE 39 23 063 A1). Through the through holes can convey working media such as compressed air become. The connection of these through holes to pressure medium connections and cylinder rooms is not disclosed.

Accordingly, the invention has for its object the suspension of the compressed air cylinder with supply of the pressure medium as versatile as possible, but uncomplicated, light can be assembled and designed with low mass.

This task is accomplished through the formation of the air cylinder solved according to the characterizing part of claim 1.

The compressed air cylinder is thus in any longitudinal position Direction of the main longitudinal side of the air cylinder Profiles with an approximately T-shaped cross section, in particular can also be suspended in the middle of the compressed air cylinder. For this the profiles with an approximately T-shaped cross-section are advantageous combined with a clamping profile, which both profiles embraces. The clamping profile is also used for Pressure medium supply from the pressure medium connections, which the Take up the pressure medium connection fitting of a line to the Cylinder rooms and any associated with them Bar pressure rooms. It is not necessary that the Air cylinder is designed as a double jacket cylinder, because the pressure medium transmission from the connection holes over each a cross hole in the profiles and one of the through holes in the profiles and one in each reaching transverse bore in a counter cylinder wall can. It is therefore not necessary that the pressure medium transmission from a pressure medium connection at one end of the Air cylinder to the one at the opposite end Cylinder chamber or bolt pressure chamber separately pressure medium line to be installed. It is for this pressure medium transfer only a few, easy to manufacture Drilling required.

According to claim 6, it is also possible, the through holes in the profiles with an approximately T-shaped cross-section for pressure medium line from one end of the compressed air cylinder to use, on which a cylinder head or a cylinder bottom in in a known manner two blind holes, each with a thread has as a pressure medium connection. For pressure medium transfer from the one blind hole in the cylinder head or the cylinder bottom to the opposite cylinder space or bolt pressure space include a first cross hole in the counter cylinder wall, the usual channels in the cylinder head with one of the Blind holes in this communicates, as well as a second Cross hole in the counter cylinder wall, which is the through hole connects to one of the pressure chambers on the cylinder base. The other blind hole is directly in a manner known per se through a hole in the cylinder head or bottom with the adjacent piston chamber and, if necessary, bolt pressure chamber in Connection. - With suitable training, cylinder head and cylinder base are interchanged.

This is preferred for supplying pressure medium and for suspending the Pneumatic cylinder used clamping profile is also advantageous formed according to claim 2.

According to claim 3, it can have an annular cross section, so that it has the counter cylinder with those molded from its wall Encompasses profiles with an approximately T-shaped cross section and moved and locked along the counter cylinder, preferably can be clamped on the flange of the profile. This clamping profile can also be called a jacket profile.

In an advantageously low-mass construction, it is sufficient according to claim 4 that the clamping profile has an approximately C-shaped cross section has, at the ends of this cross section each one of the both approaches are formed with the inner counter profiles, the on the approximately T-shaped profiles of the cylinder barrel are displaceable and lockable and which are the connection bores for screwing in a pressure medium connection fitting exhibit.

In particular for connection to the clamping profi of the invention Air cylinders are the pressure medium connection fittings the lines or head tubes with a swivel screw connection equipped with a shaft as a bearing for the pivotable mounting of the compressed air cylinder. To attach the shaft is from each approach of the clamping profile A sink is formed coaxially with the connection bore. The shaft merges into a thinner threaded bush, into the threaded connection hole in the clamping profile can be screwed in. A hole is through the threaded bush and the shaft is guided coaxially and delivers a connection the line end at which the pressure medium connection fitting is appropriate.

In a further development of the threaded bushing of the pressure medium connection fitting is a ring cutting edge from the front the coaxial bore is shaped, whereby the ring cutting edge is suitable is on the flange of the profile with approximately T-shaped Cross section to get to the plant. The flange and the Ring cutting edges act sealingly together, namely in any position in the longitudinal direction of the compressed air cylinder, in which the clamping profile is clamped.

The clamping profile is in the desired longitudinal position Set screws easily and securely on the flange of the shoulder clampable. In particular, a grub screw is used for clamping on each side of the approach of the clamping profile in Longitudinal direction on both sides of the connection hole. On the fit between the counter profile and the profile with approximately T-shaped Cross section it comes with regard to the fluid tightness practically not because this is due to the direct edition of the Ring cutting edge of the threaded bush on the flange of the profile T-shaped cross section is guaranteed.

Fig. 1

eine erste Ausführungsform eines Druckluftzylinders als Doppelhubzylinder mit einem Klemmprofil mit Druckmittelanschlüssen in einem Längsschnitt,

Fig. 2

den Druckluftzylinder gemäß Fig. 1 in einem Querschnitt,

Fig. 3

eine Einzelheit des Druckluftyzlinders gemäß Fig. 1 und 2, nämlich das Zylinderrohr, in einem Querschnitt,

Fig. 4

eine weitere Einzelheit des Druckluftzylinders gemäß Fig. 1 und 2, nämlich das Klemmprofil, welches auch als Mantelprofil bezeichnet werden kann, in einem Querschnitt, und

Fig. 5

eine zweite Ausführungsform des Druckluftzylinders, der ebenfalls als Doppelhubzylinder ausgeführt ist, mit einer anderen Ausbildung der Druckmittelanschlüsse als Zylinderaufhängung.

Embodiments of the invention are explained below with reference to a drawing with five figures. Further advantageous features and effects of the invention may be included in the explanation and drawing. Show it:

Fig. 1

1 shows a first embodiment of a compressed air cylinder as a double-stroke cylinder with a clamping profile with pressure medium connections in a longitudinal section,

Fig. 2

1 in a cross section,

Fig. 3

2 shows a detail of the compressed air cylinder according to FIGS. 1 and 2, namely the cylinder tube, in a cross section,

Fig. 4

another detail of the compressed air cylinder according to FIGS. 1 and 2, namely the clamping profile, which can also be referred to as a jacket profile, in a cross section, and

Fig. 5

a second embodiment of the compressed air cylinder, which is also designed as a double stroke cylinder, with a different design of the pressure medium connections as a cylinder suspension.

Corresponding parts are the same in all the figures Provide reference numerals.

In Fig. 1 is a compressed air cylinder with end position locking shown, which consists essentially of a cylinder head 1 and a cylinder base 2, which are connected to one another via a cylinder tube 3 are connected. The cylinder head, the cylinder bottom and the cylinder tube include two cylinder spaces 4 and 5, which are separated from each other by a double-sided piston 6 are. On the piston 6 are each one of the other opposite sides of a piston rod 7 and a locking bar 8 attached, each through a hole in the cylinder head or cylinder bottom are displaceable. For locking in One of the two end positions of the piston rod is one Groove 9 provided, and the locking bar has a groove 10. In these grooves can engage in locking steel balls 11, 12, if this by a displaceable ball sleeve 13 or 14th a locking piston 15 and 16 in the illustrated in the balls 11 squeezed position to be held while the balls 12 are radially movable when the ball sleeve 14 is pushed back are and release the groove 10 of the locking bar 8. The Locking piston 15, 16 assigned locking pressure chambers, in which the pressure shifting the locking piston builds up designated 17, 18. Each of these bolt pressure chambers 17, 18 stands over the not designated bore in the cylinder head 1 or cylinder base 2 through which the piston rod 7 or Locking rod 8 is guided with the adjacent cylinder space 4 or 5 in fluid-conducting connection, while the bolt pressure chamber 17 or 18 is sealed to the outside.

From the cylinder tube or the counter cylinder 3 are two outside longitudinal profiles 19, 20 formed, the approximately T-shaped cross section can be seen from FIG. 3. The two profiles 19, 20 are diametrically opposed to one another, what the cheapest geometry for pivoting suspension of the air cylinder on two generally designated 21, 22 Pressure medium connection fittings means in the pressure medium lines or control tubes 23, 24 open.

As can be seen from Fig. 3, each of the profiles 19, 20 approximately T-shaped with a web 25 or 26 and a flange 27 or 28 is formed which is tangential to the jacket of the cylinder tube 3 is oriented. In the longitudinal direction of each of the Profiles 19, 20 run through holes 29 and 30, respectively. Each of the through holes is at its two ends 31 - 34, for example by one not shown in FIG. 1 Steel ball or other means, closed.

The design of the cylinder tube 3 with the molded profiles 19, 20 is shown in detail in Fig. 3, in which this Cylinder tube is shown separately.

A clamping profile, which over the cylinder tube shown with the profiles 19, 20 pushed and jammed with this is drawn out in Fig. 4 and generally with Designated 35. As can be seen in particular from FIG the clamping profile is essentially C-shaped. It can be produced in that from a clamping profile strand Longitudinal direction, which is perpendicular to the plane of the drawing, is proportional short pieces are separated. The clamping profile points at each end of the C-shape an extension 36 or 37 on the internally similar in shape to the associated profile 19 or 20 of the cylinder tube 3 has a counter profile 37a or 38a. The counter profile is directed towards the inside of the clamping profile Side open while there is one in the opposite direction flat surface with lateral grooves that are not in detail are designated. One protrudes radially into the flat surface oriented connection bore 39, 40 with thread.

From Fig. 2 it can be seen in detail how the counter profile 37 or 38 with the connection bore 39 or 40 with the Pressure medium connection fitting 21, 22 interacts: this points the pressure connection fitting a swivel screw connection 41 on which protrudes a shaft 42. The shaft is partially from a depression 43 is added to the outside of this approach, which in the Connection hole, e.g. 40, passes. From each shaft 42 or 42a protrudes a threaded pin of smaller diameter, the with 44 or 44a is designated and its thread in the connection bore 39 or 40 can be screwed. Coaxial, i.e. centric, runs through the pressure medium connection fitting Bore 45 or 46, which is the connection to line 23 or 24 produces.

One is from the end face of the threaded pin 44 or 44a Ring cutting edge 47 and 48 formed on the outside of the web of approximately T-shaped profile 19 or 20 is tight when the threaded shaft 44, 44a is screwed into the shoulder 36 or 37 is.

In the through hole 29, 30 of each profile 19 and 20 opens a transverse bore 49, 50 in the extension of the bore 45 or 46 in the pressure medium connection fitting 21 or 22. Thereby is the pressure medium, i.e. here compressed air, in the through holes 29 or 30 practically under the same pressure as it occurs in a controlled manner at the line ends 23 and 24. This Pressure is through a transverse bore 51 and 52 in the wall of the cylinder tube 3 in one of the two cylinder spaces 4 or 5 and from these in the adjacent bolt pressure chamber 17 or 18 transmitted.

The control of the movement of the double-sided piston 6 and its locking in end positions is conventional depending on the controlled pressures of the pressure medium in line ends 23 and 24.

Except for the pressure medium supply to the cylinder rooms and bolt pressure rooms serve the profiles 19, 20 and the clamping profile 35 for swiveling suspension of the compressed air cylinder. The virtual one Swivel axis of the compressed air cylinder can be in the longitudinal direction profiles 19, 20 can be set arbitrarily and finely by using pairs of threaded pins 53, 54 and 55, 56, with which each of the two approaches 36, 37 of the clamping profile can be clamped on the cylinder tube 3, then released the clamping profile can be moved freely in the longitudinal direction. Depending on the desired position of the swivel axis are initially Cross bores 57, 58 through the flanges 27, 28 of the Profiles 19, 20 prepared in such places that these cross holes with the holes 45, 46 in the pressure medium connection fittings 21, 22 are aligned. These cross bores 57, 58 are sufficient in the through holes 29, 30. The after shifting the Clamping profile free cross holes in the webs 25, 26 can easily from the outside, e.g. closed by steel balls become. After the clamping profile in the desired position is brought, the set screws 53 - 56 are screwed tight again.

The embodiment of the compressed air cylinder according to FIG. 5 differs essentially from that discussed above Embodiment according to FIGS. 1-4, characterized in that in the embodiment according to FIG. 5 no clamping profile is provided is, but that here the pressure medium supply and suspension takes place on a cylinder base 60, which together with a Cylinder head 59 and a cylinder tube 61, the exterior of a Printing cylinder forms. The cylinder bottom is here with one Pair of blind holes 62, 63 arranged in one plane, to the pressure medium inside the air cylinder to guide and hang the compressed air cylinder. It can the pressure medium connection fittings according to FIG. 1 and FIG. 2 are used, which are not shown in Fig. 5. The Pressure medium supply from the blind hole 63 to the cylinder space 5 and the bolt pressure chamber 18 takes place directly through a Bore 64, which is concentric with the blind hole 63 in a not designated bore for the implementation of the locking bar 8 opens.

For pressure medium transmission or pressure transmission from the blind hole 62 to the cylinder chamber 4 and the bolt pressure chamber 17, the with the cylinder space 4 via a longitudinal bore 65 in the The cylinder head 59 is connected, however, the profile 66 with an approximately T-shaped cross-section, which, like that externally opposite profile 67 shaped like profiles 19, 20 is. Profile 67 has no function here, while the Profile 66 for pressure medium transmission from the blind hole 62 to serves the cylinder space 4 and the bolt pressure space 17, that in the cylinder tube 61 not only a transverse bore 68 analog the transverse bore 51 is provided in Fig. 1, but one another transverse bore 69 which in the region of the cylinder bottom a radial bore 70 merges into the cylinder bottom, which again connected to the blind hole 62 through a longitudinal bore 71 is.

By controlled supply of pressure medium to the blind holes 62, 63 can thus move and lock the double piston 6 analogous to the embodiment as described in FIG. 1. Different from the embodiment described first can, however, the suspension of the air cylinder here either only at the position shown in FIG Blind holes 62, 63 take place or in a practically opposite Position when the cylinder head is installed 59 and the cylinder base 60 are interchanged. Regarding the pressure medium line from the blind hole 62 to the opposite cylinder chamber and bolt pressure chamber is the formation of the cylinder tube 61 with the T-shaped Profiles also advantageous here.

Grooves 72, 73 in the cylinder head 1 and the cylinder base 2 in FIG. 1 as well as grooves 74-76 in the cylinder head 59 and the cylinder base 60 in FIG. 5 serve to receive sealing O-rings.
Overall, as the two exemplary embodiments show, the T-shaped profiles of the cylinder tube can advantageously be used in at least two different versions of the compressed air cylinder.

This also results in efficient production and warehousing of the cylinder tube for different versions of the air cylinder.

Claims (8)

Compressed air cylinder for actuating an adjustable element, in particular a flue gas flap in a smoke and heat exhaust system, with a double-sided piston which can be displaced in a cylinder tube with two cylinder spaces between a cylinder head and a cylinder base by a pressure medium, preferably with at least one connected to a piston rod standing locking device in a bolt pressure chamber and with two pressure medium connections, which are offset in approximately a cross-sectional plane of the compressed air cylinder and at a circumferential distance from the compressed air cylinder, preferably arranged opposite one another, with one of the pressure medium connections each via a pressure medium-conducting connection, which contains a transverse bore, with a of the two cylinder spaces and possibly one of the bolt pressure spaces adjacent to these is connected,
characterized,
that two profiles (19, 10, 66, 67) with an approximately T-shaped cross section are formed on the outside of the cylinder tube (3, 61) with a web (25, 26) and a flange (27, 28), that each profile has a through-bore (29, 30) sealed at both ends, that the through-bore (29, 30) is part of the pressure-medium-conducting connection, and that one of the profiles (19, 20) and at least one jacket circumferential section and one jacket longitudinal section of the cylinder tube ( 3) encompassing clamping profile (35), which contains the pressure medium connections, can be clamped onto the cylinder barrel. Compressed air cylinder according to claim 1,
characterized,
that the clamping profile (35) on the outside lugs (36, 37) with inner counter-profiles (36a, 37a) running in the longitudinal direction of the cylinder tube (3,61), which are similar to the profiles (19,20) with an approximately T-shaped cross-section of the counter-cylinder ( 3) are formed, that in the clamping profile (35) offset in the circumferential direction of the cylinder tube (3.61), preferably two through-connection bores (39.40) are drilled in the same cross-sectional plane as the pressure medium connections, which are each suitable for a threaded pin ( 44, 44a) of a pressure medium connection fitting (21, 22) and to connect one of the profiles (19, 20) with the through hole (29, 30) via a transverse bore (57, 58) in the flange (27, 28) , the transverse bore (57.58) in the flange, the connecting bore (39.40) in the shoulder and the transverse bore (57.58) in the cylinder wall (3) which are in the through bore (29.30) of the profile ( 19.20) opens, sections of the fluid-conducting connection to one of the form two cylinder chambers (4,5) and one of the bolt pressure chambers (17,18). Compressed air cylinder according to claim 2,
characterized,
that the clamping profile has an annular cross section. Compressed air cylinder according to claim 3,
characterized,
that the clamping profile (35) has an approximately C-shaped cross section and that at the ends of this cross section one of the two lugs (37, 38), the inner counter profile (36a, 37a) and the connecting bore (39, 40) is formed. Compressed air cylinder according to one of claims 2-4,
characterized,
that for the pivotable mounting of the compressed air cylinder from the shoulders (36, 37) of the clamping profile (35) coaxially with the connection bores (39, 40), a depression (43) for receiving a shaft (42, 42a) of the pressure medium connection fitting (21, 22) is formed. Compressed air cylinder according to claim 1,
characterized,
that the cylinder head (59) or the cylinder base (60) has two blind holes (62, 63), each with a connection thread as the pressure medium connections, which via channels (64) with one of the cylinder spaces (4, 5) and one of the pressure lock spaces ( 17, 18) are in fluid-pressure-conducting connection, and that the one of the profiles (66) with a through bore has a first transverse bore (69) in the cylinder wall (61) with one of the blind holes (62) in the cylinder head or cylinder base (60) stands and is connected to one of the pressure chambers (4) via a second transverse bore (68) in the cylinder wall (61). Compressed air cylinder according to claim 6,
characterized,
that from the end face of the threaded pin (44,44a) of the pressure medium connection fitting (21,22) an annular cutting edge (47,48) which is suitable on the flange (27,28) of the profile (19,20) with an approximately T-shaped Cross section to get to the system, a central bore is formed in the pressure medium connection fitting. Compressed air cylinder according to one of the preceding claims,
characterized,
that the clamping profile (35) can be clamped onto the flange (27, 28) of the attachment by means of setscrews (53-56).

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