DE3316079A1 - Hydraulic cylinder - Google Patents

Abstract

In a hydraulic cylinder with longitudinally displaceable piston, in particular for advancing tubes in gallery or tunnel construction, which can be inserted between a press abutment and a thrust ring which can be supported on the tubes, the outer casing (1') of the hydraulic cylinder (1), in a firmly positive-locking and/or frictional manner or in a firmly adjustable manner, has at least one supporting body (5) serving as pressure abutment in order to provide a small overall length and a large stroke. <IMAGE>

Description

VOLKMANK NORNBERO 49 333 SLZ 760 9OO OO COMMERZBANK NORNBERC «3OO9O7 BLZ 760 4C

Dipl.Ing. Wolfgang Zeilinger, D 8500 Nuremberg

Hydraulic cylinder

The invention relates to a hydraulic cylinder with Lüngüverschieblichom piston, especially for pre-pressing of pipes in gallery and tunnel construction between a press abutment and one to the Pipes supportable pressure ring can be used.

For pre-pressing pipes in earthworks using of hydraulic cylinders it is known stroke extensions to be achieved by installing intermediate pieces. Besides it is known to stroke extensions mechanical extension bodies the piston of the hydraulic cylinder assign. However, these known stroke extensions have an unfavorable effect on the overall lengths of the press stations the end. Furthermore, the arrangement of hydraulically operated telescopic cylinders is known. Apart from this, that telescopic cylinders have a complicated structure, they also produce only low compressive forces.

It is the object of the invention to provide a hydraulic cylinder of the type mentioned at the beginning with a short overall length and a large one To create hub.

According to the invention is to solve this problem proposed that the outer jacket of the hydraulic cylinder has at least one support body serving as a thrust ring abutment Has form-fitting and / or force-fitting firmly or adjustable firmly. Two support bodies are preferred arranged at an axial distance on the outer jacket. This ensures that the length of the hydraulic cylinder is approximately the length of the feed path results, the optional coupling of the support body with the pressure ring initially a first pre-pressing section allowed and after the hydraulic cylinder has been returned and an operative connection has been established of the other support body with the pressure ring also gives pin-second pre-pressing section.

According to one embodiment of the hydraulic cylinder, a freely displaceable cylinder side can be used as the support body serve open hollow ring body, which at the end approached the open side freely receives jaws that are attached to the inner ring wall of the hollow ring body and hydraulically or can be pressed pneumatically on the outer jacket. The support body can be fixed at any point exact adjustments of the pre-compression paths.

According to another embodiment of the hydraulic cylinder, the supporting bodies are fixed by the outer jacket Cams formed, which by means of the hydraulic cylinder in groove-shaped receptacles firmly connected to the pressure ring can be swiveled in or out. For this purpose, the cams can essentially be formed by ring sections, each with one housed in the recordings, 7.B. cooperate grooved receiving body.

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Finally, it is also provided that the outer jacket on two circumferential lines extending at a distance from at least one spherical or trapezoidal section as Has support body firmly, which can be pushed into the receptacles firmly connected to the pressure ring and through Pivoting of the hydraulic cylinder can be placed on receiving support surfaces. By means of a simple pivoting process so optionally the separation position b-zw. Coupling position between the support bodies and the pressure ring can be reached.

It is possible to carry out the pivoting movements of the hydraulic cylinder relative to the piston. aside from that it is provided to connect the hydraulic cylinder and the piston to one another in a longitudinally displaceable but non-rotatable manner and the pivoting of the hydraulic cylinder by turning of the piston mounted with a spherical head in a spherical cap of the press abutment. The swivel dos hydraulic cylinder or the hydraulic cylinder and the piston can easily be moved by means of a ratchet drive rkf been.

The invention is illustrated in the drawing using exemplary embodiments. Show here:

Figure 1 shows a hydraulic cylinder with support body in Starting position in side view,

Figure 2 shows a hydraulic cylinder with support body in the peripheral position,

FIG. 3 shows a hydraulic cylinder in the starting position with the one in the front end position Support body, retrieved,

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Fiqur 4 a hydraulic cylinder with support body in the end position,

Figure 5 oinen hydraulic cylinder of a different design with fixed support bodies in side view,

Fig. 6 shows a hydraulic cylinder in section along the line VI-VI of Fig. 5,

Figure 7 shows a hydraulic cylinder in side view

according to a further embodiment,

Figure fl oinen hydraulic cylinder dor Fig. 7 in section after the line VIII-VIII in the disconnected position,

FIG. 9 shows a section along the line IX-IX of the figure in the support position,

Figure 10 shows a hydraulic cylinder according to another Execution, partly in section and

FIG. 11 shows a hydraulic cylinder in the support position, in section along the line XI-XI in FIG. 10.

In FIGS. 1 to 4, 1 is a hydraulic cylinder and 2 is a piston, which is supported with a widening 3 on the bar abutment 4. A support body 5 for a pressure ring 9 of the press station is applied to the outer jacket I ^{1 of the hydraulic cylinder 1.} The support body 5 is formed by a ring hollow body 6, which is open on the cylinder side and which accommodates clamping jaws 7 in a freely displaceable manner, which rest against the inner ring wall 6 ¹ 'of the ring hollow body 6 and can be hydraulically or pneumatically pressed against the outer jacket 1' for fixation dor Klommbacken 7 enables a hose-shaped container 8 made of a flexible or elastic material, which encompasses the Klommbackon 7 and when the pressure medium, eg press oil, is introduced, the clamping-

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jaw 7 on the outer jacket of the hydraulic cylinder 1 applies. In Figure 1, the hydraulic cylinder 1 assumes the starting position and the support body 5 is located firmly approached on the press abutment 4 End. By advancing the hydraulic cylinder 1 is dor pressure ring 9 in the position dor Fig. 2 moved forward. By subsequently relieving the Klommhackon 7 is there Hydraulic cylinder in the starting position of FIG. 3 retrievable and after fixing the support body 5 is boi renewed advancement of the hydraulic cylinder 1 of Pressure ring 9 can be pressed into the position of FIG. By simply changing the position of the support body 5 on the Hydraulic cylinder 1 is the option without additional funds given a stroke extension.

In the embodiment of FIGS. 5 and 6 serve as Support body 5 semicircular cams 10, which are on the Aus-Ronmantel 1 'of the hydraulic cylinder 1 and in a groove 11 of a receptacle firmly connected to the pressure ring 9 12 can be swiveled in. According to the positions rlf-r support body 5, the hydraulic cylinder 1 is free The receptacle 12 can be moved therethrough (FIG. 6, fully drawn Position) or by inserting the hydraulic cylinder 1 into the groove 11 rlurr-h (Fig. 6, ge ~ :? tric "took position) on the receptacle of the pressure ring 9 is supported. The successive work connection of the '■ inen or other cam 10 with the receptacle 12 is a Stroke extension can be brought about.

In the exemplary embodiment of FIGS. 7 to 9, the Aussonrnantel I ^{1 takes} the hydraulic cylinder 1 as a support body

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Ball sections 13 firmly on, corresponding to the position dos hydraulic cylinder 1 through spaces 14 with one slide through the receptacle 15 firmly connected to the pressure ring 9, e.g. for the return movement of the hydraulic cylinder 1, or by swiveling the hydraulic cylinder 1 into the corresponding Recesses 16 for the operative connection of hydraulic cylinders 1 and pressure ring 9 can be pivoted.

In the embodiment of FIGS. 10 and 11, trapezoidal sections 23 are provided as support body 5 on the outer jacket I ^{1 of} the hydraulic cylinder 1, which in the cross-sectional shape of the support body correspondingly shaped recesses 17 of a receptacle 18 firmly connected to the pressure ring 9 can be pivoted. The hydraulic cylinder 1 is pivoted by means of a ratchet drive 19. According to the position of the ratchet drive. 19, the support bodies can also be passed freely through intermediate sections 20 of the receptacle 18 in order, for example, to enable return movements of the hydraulic cylinder 1. The piston 2 can be threatened with the hydraulic cylinder 1 at the same time. For this purpose, it can be connected to the hydraulic cylinder in a longitudinally advancing manner via a straight guide, but non-rotatably. The support of the piston 2 (FIGS. 7 and 10) in the press abutment 4 takes place by means of a ball head 21 which is fixed to the piston in a corresponding spherical cap 22 of the press abutment 4.

Claims (7)

VOLKSBANK NÜRNBERG 43 233 BLZ 760 90000 COMMERZBANK NORNBERC 83OO9O7 BLZ 76Ο4Ο0Λ1 Dipl.Inq. Wolfgang Zeilinger, D 8500 Nuremberg patent claims 1. Hydraulic cylinder with longitudinally displaceable KoI bon, in particular for pre-pressing pipes in gallery and tunnel construction between a press abutment and a pressure ring which can be supported on the pipes can be used, characterized in that the Outer jacket {! ') Of the hydraulic cylinder (1) at least one supporting body (5) serving as a pressure abutment and / or non-positively fixed or adjustably fixed. 2. Hydraulic cylinder according to claim 1, characterized in that two support bodies (S) are arranged at an axial distance on the outer jacket (I ¹ ). 3. Hydraulic cylinder according to claim 1 and 2, characterized in that the support body (5) is formed by a freely displaceable zylinderseitiq open annular hollow body (6) which on the open side zugenäherton find jaws (7) freely receives the on the inner ring wall (C ¹ ') are in contact with the hollow ring body (6) and can be pressed hydraulically or pneumatically on the outer jacket (IM. (Fig. 1 to COPY 4. Hydraulic cylinder according to claim 1 and 2, characterized in that that serve as a support body (5) outer jacket fixed cams (10), which by means of the hydraulic cylinder (1) Can be swiveled or swiveled out into a groove-shaped receptacle (12) firmly connected to the pressure ring (9) are (Fig. 5 and 6) 5. Hydraulic cylinder according to claim 1 and 2, characterized in that the outer jacket (I ¹ ) has at least one ball (13) or trapezoidal section (23) as a supporting body on two circumferential lines extending at a distance, which are in one with the pressure ring ( 9) firmly connected receptacles (15 or 18) can be placed on support surfaces that are fixed to the receptacle by pivoting the hydraulic cylinder (1). (Fig. 7 to 11) 6. Hydraulic cylinder according to claim 5, characterized in that the hydraulic cylinder (1) and the piston (2) are longitudinally displaceably connected to one another in a rotationally fixed manner and that the hydraulic cylinder (1) is rotated of the piston (2) is pivotable with a ball head (21) in a spherical cap (22) of the press abutment (4) stores. 7. Hydraulic cylinder according to claim 5 and 6, characterized in that that the hydraulic cylinder (1) or the hydraulic cylinder (1) and the piston (2) by a The latch drive (19) can be pivoted.