DE2020507A1 - Hydraulic cylinder device on a hydraulic press - Google Patents

Description

DR. R. POSCHENRIEDER

DIPL.-ING. H.-J. MÜLLER

Patent Attorneys As / K

'8MUNCiIENOO Case 19

Lucile-Grahn-Strasse 38
Telephone 443755

Verson Allsteel Press Company, 1355 East 93rd Street,

Chicago, 111. (V.St.A.)

Hydraulic cylinder device on a hydraulic press

The invention relates to a hydraulic cylinder device for a hydraulic press.

Conventional hydraulic presses have a separate working part * which is connected to one or more hydraulic pistons and can be driven by them. This direction of movement can be vertical, horizontal or inclined to the vertical or to a horizontal plane at any angle. In the case of presses with customer columns, the working parts are also guided on these columns.

The invention is based on the object of creating a hydraulic cylinder device for a hydraulic press which effectively forms the hydraulically movable working part of the press itself, so that the need for separate working parts and guides for them , such as guideways, guide columns or the like, is eliminated .

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According to the invention, the hydraulic cylinder device has an open at one end and closed at the other end, hollow cylinder body which has a large diameter cylinder at the open end and a cylinder at the closed end Cylinder of small diameter, the latter being substantially half the distance between the ends of the Cylinder body communicates with the cylinder of large diameter «Xn the cylinder body is in the longitudinal direction movably received a piston body, between its front ends a received in the cylinder of large diameter Large diameter pistons and a small diameter piston extension received in the small diameter cylinder and a plunger extension of are formed with a mean diameter, the latter of which passes through the open end of the cylinder body protrudes outside. Between the small diameter cylinder and the piston extension is for the guidance of this end of the piston body provided a guide device during its longitudinal movement, and between the cylinder of large Diameter and the plunger extension is also used to guide this end of the piston body during its longitudinal movement a tour provided. Since the piston is guided in this way with both of its ends, the tappet extension forms in itself in an effective manner the hydraulically movable working part of the hydraulic press, without the arrangement a separate working part or additional guide means is required for this.

The guide device for the plunger extension of the piston body preferably has several distributed over the circumference, Radially adjustable rollers carried by the cylinder body for the attack on the tappet extension in a play-free manner pre-tensionable way. The guide device for the piston extension can also have adjustable rollers or consist of such or a bearing bush or

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the like, and the choice depends on what is required Degree of accuracy of the guidance. This guiding way is guaranteed a much higher accuracy and a reduction in the deflection of the ram extension or of the working part with eccentric loading. To rotate the piston body to prevent with respect to the cylinder body, a tongue and groove connection is preferably used ,, and the large diameter piston is preferably equipped with a hydraulic fluid packing or stuffing box arrangement, which hydraulically seals the piston body in the cylinder body.

The hydraulic cylinder device according to the invention can can be used with essentially any press construction, and the direction of movement can be as above already-expressed, essentially in any direction lie. The hydraulic cylinder can be accommodated in the cross yoke or in the lower frame part of the press, as desired, and the latter arrangement was chosen for the following description and illustration of the invention.

According to the invention, there is therefore a hydraulic cylinder device provided for a hydraulic press, which in an effective manner even the hydraulically movable working part of the Press educates. Includes a hollow hydraulic cylinder body having an open and a closed end; a cylinder large diameter at the open end and a small diameter cylinder at the closed end, and the Cylinders are conductively connected to one another approximately half a distance between the ends of the cylinder body. Xn the cylinder body is movably received in the longitudinal direction, a piston body, and this contains between its Facing a piston of large diameter received in the cylinder of large diameter, one in the cylinder small diameter piston extension of small diameter and one through the open end of the

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202Q507

Cylinder body protruding tappet extension of a mean diameter, which in an effective manner the hydraulically forms movable working part of the hydraulic press. The large diameter piston carries a pressure fluid s seal abutting the large diameter cylinder and hydraulically pushing the piston body in the cylinder body seals. Between the small diameter cylinder and the piston extension is a guide device for the Longitudinal guidance of this end of the piston body during its longitudinal movement and guide means is provided between the large diameter cylinder and the plunger extension provided for guiding this end of the piston body during its longitudinal movement.

In the drawing, a preferred embodiment is the Invention shown for example.

FIG. 1 is a front view of a press structure having a hydraulic cylinder device according to FIG Invention;

Fig. 2 is a side view of the press structure as seen from the right in Fig. 1;

Figure 3 is a horizontal section through the press structure taken substantially along line 3-3 in Figure 1;

FIG. K is a larger-scale vertical section of the hydraulic cylinder device according to the invention for the schematic illustration of parts of the press construction, essentially along the section line kk in FIG. 2;

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Fig. 5 is a horizontal section through part of the Hydraulic cylinder device on a larger scale to illustrate a section from the device shown in FIG. 3; and

Fig. 6 is a vertical section taken substantially along section line 6-6 in Fig. 5 "

Figures 1 to 3 show a press construction in a schematic manner .10. Although the press can take many forms, for the purposes of illustration a press with a supporting base 11 which is suitably attached to a foundation 12 has been chosen. On the supporting base 11, a frame member is suitably fixed 13, projecting from which a plurality of columns 14 upwardly and a transverse yoke 15 bear the biased to suitably fixed by turned-down working part 16 of the press carries _e The press construction, by Gewindezuganker 17 which extend through the lower frame member 13 "through the columns 14 and through the transverse yoke 15 and onto which tie-rod nuts 18 and 19 are screwed to pretension the press" The press construction described, as illustrated schematically in FIGS. 1 to 3 , is the usual one, and a more detailed description of it is unnecessary.

The frame member 13 is in the form of a hydraulic cylinder body open at the top and closed at the bottom, consisting of a cylinder 22 of large diameter, adjoining the open end, and a cylinder 23 of small diameter, adjoining the closed end, and the two cylinders 22, 23 are essentially connected to one another at half the distance between the ends of the cylinder body. In the cylinder body or frame member 13, a piston body 2k is received movably in the longitudinal direction,

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a piston 25 of large diameter received in the cylinder 22 of large diameter is formed between the ends thereof. The piston body also has a small diameter piston extension 26 received in the cylinder 23 and a medium diameter tappet extension 27 projecting through the open end of the cylinder body 13, and the latter forms the hydraulically movable working part of the hydraulic system Press construction 10, the piston 25 is equipped with an annular pressure fluid packing 28 which is held in position by a bushing 29 with a shoulder engaging a shoulder of the piston 25 and by a bushing 30 with an upturned shoulder. One by means of screws 32 retaining ring 3I, which is fastened to the piston 25 and engages the shoulder on the bushing, holds the bushings 29 and 30 and the pressure fluid pack 28 in their position on the piston 25. In this way, the piston body 2k is hydraulically sealed in the cylinder body.

The tappet extension 27 of the piston body 2k is guided during its longitudinal movement by several rollers distributed over the circumference (FIGS. 3 to 6). In the case of the exemplary embodiment (FIG. 3), eight such guide rollers are shown. Around the cylinder 22 of large diameter, a number of cutouts 33 are provided on the cylinder body 13, on which a corresponding number of brackets ^r jk are arranged. Each bracket 3 ^ has a leg projecting downwards into the cylinder 22 with a large diameter, which leg is provided with a cam flank 35 and with side flanges 36 projecting along the same. A roller bearing 37 for each console "} k has a downward extension with a cam flank 38 which engages the cam flank 35 on the console 3 ^, and the

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Roller bearing 37 3- ^s * ^ ^{η of} the console 3 ^ through the flanges

36 led. The roller bearing 37 is at 39 for receiving the Forked leadership role.

Through the forked end of the roller bearing 37 is a Pin 41 inserted through a head 42, the section of which 43 of reduced diameter a thread for receiving a nut 43A for securing the pin 41 in it Has position in the roller bearing 37. The roller bearing

37 is preferably designed as a roller bearing with an inner race 44 carried by the pin 41 , with several rolling rollers 45 and with an outer race 46 which forms the guide roller for the tappet extension 27 of the piston body 24. The rollers are enclosed by end plates 47 carried on the inner race 44. When the nut 43A is tightened on the pin 41, the head 42 of the pin 4i clamps the plates 47 and the inner race 44 against the roller bearing 37 »so that the inner race 44 is fixed and the outer race 46, which forms the guide roller, is freely rotatable.

The roller bearing 37 is related in the vertical direction adjustable on the console 34, and the degree of adjustment in the vertical direction is determined by a chuck 48, and the console 34, the roller bearing 37 and the Lining blocks 48 are fastened in their position on the cylinder body 13 by means of screws 49. A definition of the roller bearing 37 in a higher or in a lower position, as determined by the thickness of the chuck 48, causes a radial adjustment of the roller 46 with respect to the tappet extension 27 of the piston body 24, by the same The thickness of the lining block 48 can be defined in this way by grinding be that the roller 46 engages the plunger extension 27 with a desired degree of bias. If all Roll 46 in this way accordingly with the

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desired degree of preload are set radially, a play-free guidance of the plunger extension 27 of the piston body 2k is guaranteed, and since the rollers k6 are in the form of roller bearings, the longitudinal movement of the plunger extension 27 is opposed to an extremely low resistance even with play-free guidance. The tappet extension 27 is preferably equipped with several flat inserts "50, so that it presents flat surfaces on which the rollers k6 can roll when the tappet extension 27 moves up and down. These flat surfaces form a useful basis for pretensioning the guide rollers k6 in the manner described above and also help to prevent rotation of the piston body 2k with respect to the cylinder body 13. The guide rollers k6 can be cylindrical or, as shown, have a convex curvature.

A bracket 52 is fastened to the cylinder body 13 by means of screws 53 and carries a bar $ k with a guide spring 55 which is received in a groove 56 formed in the tappet extension 27 of the piston body 2k. The spring 55, in conjunction with the groove 56, prevents the piston body from rotating with respect to the cylinder body during the longitudinal movement of the piston body in the precisely guided manner described above,

If desired, the piston extension 26 of the piston body 2k can be guided in a similar manner by means of rollers, but instead it can be guided by means of a bushing 58 which is carried by the piston extension 26 and snugly contacts the cylinder 23 of the cylinder body 13. Whether rollers or a bushing 58 are used in the individual case depends on the desired degree of accuracy of the guide.

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From the above it can be seen that the piston body 2k during its longitudinal movement in the cylinder body 13 "during which it is lifted or lowered under its own weight by the application of hydraulic pressure to the underside of the piston 25, to the extent permitted by the hydraulic pressure, is guided exactly at its ends. As a result, the ram extension 27 at the upper end of the piston body 2k can naturally form the hydraulically movable working part of the press, and the need for separate working parts or separate guide devices for such is eliminated. The plunger extension 27 can itself form this working part, or such a working part can be rigidly attached to it by screws or the like.

For example, the large diameter cylinder 22 may have a 1,800 mm (71 »5 inch) cylinder bore, the small diameter cylinder 23 may have a 650 mm (25» 5 inch) bore, and the piston body 2k may have 2,400 mm (95 inches) ) long with a piston portion 25 of 330 mm (13 inches) in length and a plunger extension 27 of 1200 mm (47 inches) in length. The piston extension can be 1270 mm (50 inches) in diameter and the piston stroke of the piston body 2k can be 510 mm (20 inches) with a closed height of 1370 mm (5k inches). The guide rollers k6 can be 178 mm (7 inches) in diameter and can be heavy duty rollers with a maximum static load capacity of 96 t (21860 pounds) and a basic dynamic load capacity of 3 ^.15 t (7538O pounds), so that they guarantee maximum, backlash-free guidance accuracy at hydraulic pressures in the range of around 80 t. (All dimensions are only exemplary and approximate).

Although for purposes of illustration only one embodiment

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Form of the invention has been described, the person skilled in the art will recognize a variety of possibilities with knowledge of the disclosure the modification without deviating from the inventive concept.

Claims

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Claims (8)

Claims ί 1 · iHydraulic cylinder device for a hydraulic press, ^ - which at the same time forms the hydraulically driven working part of the press, characterized by a hollow hydraulic cylinder body that is open at one end and closed at the other end with a cylinder of large diameter and a cylinder connected to the open end the closed end adjoining cylinder of small diameter, which latter is essentially half the distance between the ends of the cylinder body with the cylinder of large diameter in conductive connection, a longitudinally movably received in the cylinder body piston body, between the ends of a piston in the cylinder large diameter piston housed in the small diameter cylinder, a small diameter piston extension housed in the small diameter cylinder and extending towards the closed end of the cylinder body, and a small diameter piston extension through the open end of the cylinder body protruding ram extension of a medium diameter which effectively forms the hydraulically drivable working part of the hydraulic press, a pressure fluid pack carried by the piston of large diameter, which rests against the cylinder of large diameter and hydraulically seals the piston body in the cylinder body, guide means between the small diameter cylinder and the piston extension for guiding that end of the piston body as it moves longitudinally; and guide means between the large diameter cylinder and the plunger extension for guiding this end of the piston body as it moves longitudinally. - 12 - 009852 / Ü252 2. Hydraulic cylinder device according to claim 1, characterized by a spring groove arranged in the piston body and extending in the longitudinal direction, and a A spring carried in the cylinder body and guided in the spring groove to prevent rotation of the piston body in relation to the cylinder body, 3 «hydraulic cylinder device according to claim 1 or 2, characterized in that at least one of the guide devices consists of several, carried by the cylinder body in a radially adjustable manner and attached to the associated extension of the Piston body attacking roles consists, k, hydraulic cylinder device according to one of claims 1 to 3 »characterized in that the guide device between the cylinder of large diameter and the piston extension of a number of circumferentially distributed, radially adjustable from the cylinder body between the cylinder of large diameter and the plunger extension Wise carried roles and acting on the piston extension, 5, hydraulic cylinder device according to one of claims 1 to h _t, characterized in that the guide device between the cylinder of large diameter and the tappet extension has the following parts: a number of brackets distributed over the circumference, carried by the cylinder body and into the cylinder of large diameter projecting cam members, a number of roller bearings with in de * n cylinder projecting cam members which act on the cam members of the consoles, means for fixing the roller bearings on the consoles in an adjustable manner such that the cam members radially adjustable the roller bearings 009852/0282 Way set and a number of on the roller bearings between the large diameter cylinder and clusters carried by the ram extension which engage the ram extension. 6. Hydraulic cylinder device according to claim k, characterized in that the guide device between the ■ cylinder of small diameter and the piston extension has a sleeve carried by the piston extension, which is guided in the cylinder of small diameter, 7. Hydraulic cylinder device according to claim 5 »thereby characterized in that the guide device between the Cylinder of small diameter and the piston extension has a bushing carried by the piston extension, which is guided in the cylinder of small diameter. 8. Hydraulic cylinder according to one of claims 1 to 7 »characterized by a bushing with a shoulder on the large diameter piston on one side of the Hydraulic fluid packing to interact ·? with a Shoulder on the piston, a sleeve with a shoulder on the piston of large size facing the tappet extension Diameter on the other side of the fluid pack and one on the large diameter piston fastened and surrounding the ram extension retaining ring which engages the shoulder of the latter socket and to hold both bushings and the hydraulic fluid pack serves in its position on the large diameter piston. 009852/0252 Blank page