DE7917739U1 - PRESSURE CYLINDER - Google Patents

Description

PATENT LAWYERS RUFF AND BElER STUTTGART

Dipl.-Chem. Dr. Calls Oipl.'lng. J. Baier

A 17 980

Neokorstrasse SO D-7O00 Stuttgart ι Tel .: C0711) 2270Ö1 * Telex O7-23412 erubd

June 20, 1979 Sf / ßi

Applicant:

Walter Bronzino Pier Mauro Bronzino Via Krusciev, 5

Caprie - Frazione Novaretto. Italy Printing cylinder

The invention relates to a hydraulic fluid-operated rotating cylinder for controlling gripping devices or spindles and self-centering chucks of machine tools in general.

In particular, the invention relates to hydraulic fluid actuators Cylinder, with a cylinder body connected in a fixed rotational relationship to the gripping device, one inside the cylinder in axially movable but in a fixed rotational relationship with the cylinder, a shaft rigidly connected to the piston, which via a lever system opens the opening and the Closing the jaws of the gripping device controls, whereby the piston separates two chambers within the cylinder, which have one Manifolds are alternately connected to a pressurized liquid source and a discharge line, to create the double action of the cylinder.

In addition, the above-described hydraulic actuated cylinders, as is known, may or may not be provided with safety valves, which are check valves and with

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Presence ensure the constantness of the fluid pressure inside the cylinder to avoid the decrease or Avoid dropping the pressure acting on the clamping jaws.

Hydraulic fluid actuated cylinders of this type are in the German published patent applications 19 11 558, 21 50 041 and 21 51 742 are disclosed.

Incorporate the possibility or necessity of such valves' i depends of the controlled gripping devices on the type, the presence of such valves is absolutely necessary if the device is provided with jaws that have a long gripping stroke and a control mechanism reversible type. Conversely, such valves are unnecessary if the device is provided with jaws with a short gripping stroke and a non-reversible control mechanism.

The arrangement of these safety valves in the cylinders known at the time requires a remarkably complicated construction wise, so that the cylinders i provided with safety valves and those without them are completely different in their design ^! so that in the techniques currently known there are two different categories of hydraulic fluid operated cylinders depending on the different requirements of use. ■

This causes a considerable economic setback, since in cases where other parameters remain unchanged, such as rotational speed, dimensions, gripping force or the like, constructions with completely different types can be provided must, depending on whether the cylinder is equipped with safety valves or not.

The invention is based on the object of avoiding this kickback in that such an arrangement of the individual

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parts is provided which enable the conversion of a cylinder fitted with safety valves into a cylinder without Safety valves and vice versa allows by essentially only one component is replaced and essentially the same basic construction is used, thereby significantly reducing manufacturing operations and costs.

Another object of the invention is to provide a cylinder in which it is possible for the aforesaid deformation to be carried out in a simple and rapid manner can be provided so that, depending on the requirements, cylinders with safety valves and cylinders without them can be provided can, and this can be done on a common basic structure.

A further object of the invention is to make it possible to use a cylinder that is actuated by pressure fluid r of the type mentioned at the outset, in which the safe heitsventi 1 e, if they exist, be easily accessible intended, either for review and for repairs or replacements.

The invention proposes to solve this problem and to achieve other advantages resulting from the description a hydraulic fluid operated rotating cylinder for Control of the gripping devices of machine tools and the like before, the one cylinder body, one sliding therein and the Piston separating cylinder chambers, a control piston rod rigidly connected to the piston, one end of which is arranged for the transmission connection with the gripping devices, in the Lines arranged in a cylinder body for alternating connection with a pressure fluid source and a discharge line, Safety valves to keep the fluid pressure constant within the cylinder, as well as a locking valve and one of the chambers opposite flange, wherein the cylinder body and the flange have mutually adapted mating surfaces, according to the invention, the flange in it a-n-

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Orderly valve seats to accommodate the safety valves, fastening devices for detachable fastening of the flange has on the cylinder body, as well as from the valve seats emanating channels, the channel end sections on the mating surface of the flange open out, wherein the provided in the cylinder body * lines have line end sections that on the The mating surface of the cylinder body opens into a straight extension of the channel end sections.

Further features, details and advantages of the invention emerge from the following description of two preferred embodiments of the invention ₅ and with reference to the drawing. Here show:

Figure 1 is a front view of the cylinder from the side of the removable flange;

Fig. 2 is a longitudinal section along line II-II in Fig. 1, wherein the cylinder has a flange with safety valves and

3 shows a partial section similar to the section in FIG. 2, but with a flange without safety valves.

In the drawing, the reference numeral 10 generally designates the cylinder body, which comprises a hollow hub 11 and a cylindrical, contains bell-like section 12 on its front is open in the direction of the side on which the gripping device, not shown, is arranged. The reference numeral 13 denotes generally a liquid distributor that is slidable and sealed is fixed on the hub 11 with the possibility of rotation around the hub axle. Within the cylindrical bell 12, a piston 14 is slidably arranged in a sealed manner, which is rigidly connected to a hollow piston rod 15 is connected, one end of which is sealed slides within the cavity of the hub 11 and the other end thereof in the direction of the gripping device to actuate the not shown

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provided known mechanism that controls the opening and closing of the jaws. The piston 14 divides two chambers within the bell 12, which are alternately brought into connection with a supply line 16 or a discharge line 17 via the distributor 13.

For this purpose, the distributor 13 is provided with circumferential lines 18, 19, which with corresponding in the edge wall of the Body 10 formed channels 20,21, 20 ", 21 'are connected, these channels running in the hub 11 and the bell 12, from which they emerge on the front side.

Further channels and lines can be provided in the hub 11 and in the distributor 13 in order to connect the hydraulic fluid to complete and in the circumferential lines 18,19 of the distributor 13 webs can be arranged to a control of the liquid passage by rotating the manifold 13 to allow in different angular positions. Since these elements are not necessary for this invention and the principle of operation a rotary distribution is known per se, an ins single outgoing description omitted here.

A flange 22 closes the bell 12 on the front side from the side of the gripping device, and the piston rod 15 traversed it in a sealed manner the flange 22.

As can be seen from Fig. 2, the flange 22 contains a pair of axially extending seats for receiving the safety valves K1 and K2, which on one side with the cavity of the cylindrical bell 12 and on the other side via radially extending channels 20a and 21a " 20a 'and 21a ¹ and end connection lines 20b and 21b corresponding to the open channel end portions of the wall channels are in communication with the channels 20, 21, 20' and 21 'formed in the peripheral wall of the body 10, respectively.

The mode of operation of the device and the valves KI and K2 is known and not essential for the present invention, whereby

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these valves are of the kind irt the published German patent application 28 28 609 and English patent application 20 00 455 A are described. Such valves included a valve closure element 24 which is acted upon by a spring and in the open position by a small control piston 25, which is responsive to the pressure difference on its two sides.

The flange 22 is detachable with the aid of the bolts 26 on the bell 12 and can easily be removed or replaced with a different flange, such as flange 27, the has no safety valves Kl and K2, but is traversed in the same way sealed by the piston rod 15, as can be seen in FIG.

The flange 27 is also provided with channels 28 and 29 with the open channel end portions formed in the cylinder wall Channels match, and is therefore directly interchangeable with the flange 22 in order to allow the reshaping of a cylinder with safety valves in a cylinder without safety valves, there the basic structure is the same for the two types of cylinder.

From the description and the drawings it is obvious that the valves Kl and K2 as a result of the inventive Design are easily accessible, which facilitates the checking and replacement of the valves.

Claims (5)

Expectations Fluid pressure-actuated rotary cylinder for controlling gripping devices, machine tools or the like, with a cylinder body, a piston slidingly arranged therein, separating the cylinder chambers, a control piston rod rigidly attached to the piston, one end of which is arranged for the transferring connection with the gripping devices, with lines arranged in the cylinder body for alternating connection with a pressurized fluid source and a discharge line, with safety valves for keeping the fluid pressure constant within the cylinder, as well as with a flange closing off the cylinder and facing one of the cylinder chambers, the cylinder body and the flange having mating surfaces adapted to one another, characterized in that the flange (22) has valve seats for receiving safety valves (Kl, K2), fastening devices (bolts 26) for detachable fastening of the flange (22) on the cylinder body (10), as well as the valve seats outgoing channels (20a, 20a ', 21a, 21a ¹ ), the channel end sections (20b, 20b', 2Ib, 21b ¹ ) open on the mating surface of the flange (22), the in the A 17 980 - 1 - Cylinder body (10) provided lines (20, 20 ', 21, 21') Have line end portions that are on the mating surface of the Cylinder body (10) in a straight line extension of the Channel end sections (20b, 20b ', 21b, 21b') open. 2. Cylinder according to claim 1, characterized in that the cylinder body (10) has a hub (11), a cylindrical, bell-shaped section (12) open to the end face, and a rotating manifold (13) supported on the hub (11), the cylindrical, bell-shaped portion (12) providing the mating surface for closing by an exchangeable flange (22,27). 3. Cylinder according to claim 1 or 2, characterized in that the flange (22,27) is an exchangeable flange which contains the channels (20a, 2Oa ', 21a, 21a ¹ ; 28,29), wherein between the channel end sections ( 20b, 2Ob'21b, 21b ¹ ) and the line end sections ^{(20,20 ', 21,2I 1} ) sealing rings (23) are provided in the manner of O-rings. 4. Cylinder according to one of claims 1 to 3, characterized in that the valve housing of the safety valves (Kl, K2) are arranged in the flange (22) preferably running in the axial direction of the cylinder body (10). 5. Cylinder according to one of claims 1 b ^ s 4, characterized in that the control piston rod (15) has the flange (22,27) is traversed in a sealed relationship.