WO2019233528A1 - Hydraulic adjusting device - Google Patents

Abstract

The invention relates to a hydraulic adjusting device for an agricultural tilling machine which comprises a first pressure medium supply (1) for providing a pressurized pressure medium, at least one first work section (4), and a second work section (5). The first and second work section (4, 5) have at least one first and second cylinder (6, 7). Each of the cylinders (6, 7) is designed to be double-acting and has a hydraulic connection on the cylinder piston side and a hydraulic connection on the cylinder ring side. A connection line (11) which is exposed to the pressure by a first interruptible connection (14) hydraulically connects the ring side of the at least one first cylinder (6) to the piston side of the at least one second cylinder (7) such that the pistons of the cylinders (6, 7) can each be brought into an end position by applying pressure. In the end position, a quantity of the pressurized pressure medium fills the volume defined by the connection line (11) and by a part of at least one of the cylinders (6, 7) such that the pistons of the cylinders (6, 7) are coupled together by said quantity and the position of the cylinders relative to each other is fixed when the interruptible connection (14) is interrupted.

Description

 i

 Hydraulic actuating device

The present invention relates to a hydraulic actuator for an agricultural tillage implement. As tillage equipment in the present context in particular a tine device such as a cultivator, a harrow such as a disc harrow, in particular short harrow, or rotary harrow, a sowing device such as a seeder, a seeder or a seed drill, a seedbed combination, a mulcher or a

Hoe, especially a rotary hoe understood. However, mowers, tedders or shredders are not in the present context as

Tillage equipment to understand.

In agriculture, the development of tillage equipment is increasingly in the direction of increasingly wider tillage equipment with multiple

Work sections to enable faster and more efficient machining of large areas. The several working sections are seen in the working direction adjacent sections of the

 Tillage implement, the lateral extent together give the working width of the harrow. The larger the working width of the

The harrow is the more important it is

To be able to adjust uneven floors to enable a homogeneous soil tillage.

 Tillage equipment with several working sections and the possibility of working depth adjustment of tillage tools on rollers are basically known. These rollers are not only the working depth adjustment of the actual processing tools, but also the reconsolidation of the soil after its processing. Therefore, the rollers, which are also referred to as follower rollers, are seen behind in the working direction

Tillage tools.

Each work section is assigned its own follower roller, which are fastened to the frame, for example via two bearing points each with a carrier system to the front, oscillating on one balance beam each. That's how it is a stable contact triangle with simultaneous adjustment of the follower rollers to the ground and a uniform reconsolidation is made possible by the follower rollers.

However, this pendulum mechanism for the trailing rollers is associated with great effort and therefore costly. With regard to the already known

Possibility of a hydraulic depth adjustment, the pendulum mechanism can be supplemented or replaced by a hydraulic circuit.

There are already hydraulic mechanisms with a master-slave system for adaptation to the ground, which are disclosed for example in US 4,427,207 A and US 4,354,688 A. However, these systems require active control of the cylinders used and a sophisticated valve technology for simultaneously controlling and maintaining the working depth.

It is an object of the present invention to provide a hydraulic actuator for an agricultural implement

 A soil tillage implement or method for operating a hydraulic tiller to adjust an agricultural tillage implement, thereby overcoming the need for complicated shuttle mechanics through a hydraulic mechanism without requiring active control or valve engineering, and thereby providing homogeneous reconsolidation of the tilled soil Working width is possible.

According to the invention this object is achieved by a hydraulic adjusting device with the features of claim 1 and a method for operating a hydraulic adjusting device with the features of claim 12.

Preferred features of embodiments can be found in the subclaims.

The present invention provides a hydraulic actuator for

agricultural tillage implement ready. The hydraulic

Control device comprises a first pressure medium supply for providing a pressurized medium, at least a first working section and a second working section, the first working section having at least a first cylinder and the second working section having at least one second cylinder. The cylinders are each double-acting and have a hydraulic connection on their piston side and a hydraulic connection on their ring side. Via a connecting line, the ring side of the at least one first cylinder is hydraulically connected to the piston side of the at least one second cylinder. The piston of the at least one first cylinder and the piston of the at least one second cylinder are through

Applying the pressure in each case can be brought into an end position, wherein the

Connecting line through a first interruptible connection is exposed to the pressure or can be suspended. So fills in the final position a lot of the under pressure

 Pressure medium to the volume completely, which is defined by the connecting line and a part of at least one of the at least one first cylinder and the at least one second cylinder. Thus, the piston of the at least one first cylinder and the piston of the at least one second cylinder are coupled together by this amount and their respective position relative to each other is fixed when the interruptible connection is interrupted.

By completely filling the volume with the pressure medium

Ensures that both working sections are hydraulically coupled with each other. The relationship between the two working sections to each other is determined by the complete filling of the connecting line in the end position, because by closing the interruptible connection a closed

Hydraulic circuit is formed so that again when approaching the end position both pistons are in the same position. The movements of the pistons are synchronized with each other by the coupling.

In a preferred embodiment, the at least one first cylinder is designed as a master cylinder and the at least one second cylinder is designed as a slave cylinder, so that an annular surface of the at least one first cylinder substantially one Piston area of the at least one second cylinder corresponds. This achieves a hydraulic synchronization of the two working sections.

The execution as a master-slave system ensures that both cylinders move the same way, as long as the interruptible connection interrupted after filling with the defined volume in the end position and the hydraulic circuit of the at least one first cylinder, the at least one second cylinder and the connecting line is closed. About the

Area ratio between the annular surface of the at least one first cylinder and the piston surface of the at least one second cylinder is clear that in each cylinder, the same amount of pressure medium is displaced, whereby both have the same stroke. Both working sections are thus coupled in height to each other and when driving the master cylinder on the

desired working height, the working section of the slave cylinder is automatically moved via the coupling in the same working height.

Alternatively, several cylinders may be present in both working sections or in only one of the working sections. Important for the uniform guidance of both working sections is in particular the ratio of the piston surfaces which are coupled to the connecting line. The total area of the piston side (s) of the one or more master cylinders must be approximately equal to that of the master cylinder

Total area of the ring side (s) of the one slave cylinder or the plurality of slave cylinder correspond.

In a further preferred embodiment, the first working section has at least two first cylinders and the second working section has at least two second cylinders, wherein the first cylinders are hydraulically connected to each other in parallel and the second cylinders are hydraulically connected to each other in parallel, so that all the piston surfaces of the first cylinder hydraulically connected to each other, all piston surfaces of the second cylinder are hydraulically connected to each other, all annular surfaces of the first cylinder are hydraulically connected to each other and all annular surfaces of the second cylinder hydraulically with each other are connected so that the pistons of a working section can each oscillate relative to each other.

Since the at least two first and at least two second cylinders each have parallel hydraulically connected piston sides and hydraulically connected in parallel

Ring sides, the pistons of a working section to the

preset working height hydraulically pendulum. In the case of uneven ground, the trailing roll of a working section can accommodate this unevenness without causing an increase in the entire working section and without requiring the pendulum mechanism required in the prior art for this purpose. The area in front of the rollers with the working tools maintains its height relative to the ground.

 Alternatively, however, each working section may also each have only one hydraulic cylinder, so that the adjusting device has only a first and a second cylinder. In this case, the compensation of unevenness may also take place, but is less stable and may require additional mechanical support to allow the same homogeneity of reconsolidation of the soil.

In a preferred embodiment, the connecting line and all

hydraulic connections of the at least one first cylinder and the at least one second cylinder simultaneously with the pressure of the first

Pressure medium supply connectable, so that the piston of the at least one first cylinder and the piston of the at least one second cylinder moved to an extended end position.

By applying the same pressure to all ports of the at least one first cylinder and the at least one second cylinder, a so-called Allschaltung, all pistons extend to their extended end position, as acts through the larger surface of the piston sides relative to the ring sides on this a higher force , Since all connections simultaneously with the pressure of the

Pressure medium supply are connected, it is ensured that all lines are filled with pressure medium when the pistons have taken the final position. After the interruptible connection, via which the pressure is applied to the ring side of the at least one first cylinder and the piston side of the at least one second cylinder is interrupted, it is ensured in this extended end position that the pistons are in a mutually defined position and over the complete filling of the volume defined by the connecting line and a part of at least one of the at least one first cylinder and the at least one second cylinder is hydraulically coupled to the pressure medium.

 Alternatively to pistons with a ring side, which has a smaller area than the

Piston side can also vertically positioned cylinder with pistons are used, in which both sides of the piston have the same area. In this alternative, the frame to which the cylinders are attached must be positioned so high above the ground that the weight of the rollers attached to the pistons causes the pistons to extend to their final position. An increased positioning of the frame is possible, for example, by means of downstream wheels, as are known for the road transport of towed agricultural machines.

In a further preferred embodiment, the piston side of the at least one first cylinder is hydraulically connected to a master line, the

Ring side of the at least one second cylinder is hydraulically connected to a slave line. In this case, the master line has a second interruptible connection and the slave line has a third interruptible connection. The first, second and third interruptible connections are connected to a synchronous line and the synchronous line itself is the first one

Pressure medium supply connected. The first, second and / or third interruptible connection is preferably a releasable seat-tight valve such. a logic valve, a pressure valve or a directional control valve, particularly preferably one

Check valve.

 About the synchronous line, it is possible, each piston chamber with the

To connect pressure medium supply and thus bring the piston as already described in a defined extended end position. Through the interruptible Connections, the connection to the pressure medium supply can be interrupted, so that at least one first cylinder and the at least one second cylinder can be controlled via other hydraulic lines to change the position of this, wherein the hydraulic coupling via the

closed volume between the ring side of the at least one first

Cylinder and the piston side of the at least one second cylinder is ensured.

The cylinders can also be connected differently.

In another embodiment, the piston side of the at least one first cylinder is hydraulically connected to a cylinder extension line, and the ring side of the at least one second cylinder is connected to a cylinder intake line

hydraulically connected. The cylinder extension line and the cylinder retraction line are hydraulically connected to a second pressure medium supply for providing a pressurized medium under a second pressure. In an extended state, the cylinder extension line is subjected to the second pressure, and in a retracted state, the cylinder retraction line is subjected to the second pressure, so that in the extended state, the pistons of the at least one first cylinder and the at least one second cylinder extend

Retracting state retract the piston of the at least one first cylinder and the at least one second cylinder.

The at least one first cylinder and the at least one second cylinder are actuated via a second pressure medium supply and the cylinder intake line and the cylinder extension line in order to adjust the height of the rollers which can be adjusted via the pistons. Due to the hydraulic coupling, preferably in the master-slave assembly, of the at least one first cylinder and the at least one second cylinder, it is sufficient to control the piston side of the at least one first cylinder and the ring side of the at least one second cylinder relative to the position of the piston to change the cylinders and thus to adjust the position of the rollers relative to the frame. In an alternative embodiment, instead of a second

Pressure medium supply and the first pressure medium supply can be used. The second pressure medium supply corresponds in this case a valve that the

Cylinder inlet line and the ZylinderSusfahrleitung connects with the pressure of the first pressure medium supply. This valve may for example be a three-way valve, in which in the first switching position, the synchronous line and thus all piston surfaces are connected to the pressure of the first pressure medium supply, in the second switching position on the cylinder extension line, the piston side of the at least one first cylinder the pressure of the first pressure medium supply is applied, while the ring side of the at least one second cylinder is connected to a reservoir, and in the third switching position via the cylinder Einfahrleitung the ring side of the at least one second cylinder is acted upon by the pressure of the first pressure medium supply, while the Piston side of the at least one first cylinder is connected to the reservoir.

In a further embodiment, the first pressure medium supply is hydraulically connected to a fold-out line and to a fold-in line, wherein the fold-out line is hydraulically connected to the synchronous line and to the piston side of the at least one first cylinder and the fold-in line the cylinder intake line is hydraulically connected. At a

Pressing the Ausklapp line with the first pressure is the synchronous line pressurized, the first, second and third interruptible

Connection are not interrupted and the piston side and the ring side of the at least one first cylinder and the piston side and the ring side of the at least one second cylinder are acted upon by the first pressure. When the Einklapp-line with the pressure, the first, second and third interruptible connection are interrupted and the ring side of the

at least one second cylinder is pressurized.

By Ausklapp-line the Allschaltung of the at least one first cylinder and the at least one second cylinder can be made, whereby all the piston of the cylinder moved to the extended end position, while at a Actuation of the Einklapp-line with the pressure no change in the position of the piston is possible because the interruptible connections are interrupted and the pressure medium on the piston side of at least one first cylinder can not be displaced. Thus, it is ensured that upon actuation of the AusklappLeitung with the pressure synchronization of the position of the cylinder is completed, while in a control of the Einklapp-line the piston of the cylinder both working sections and thus the position of the rollers relative to

Frame remain unchanged.

The cylinders can also be connected differently.

More preferably, the Ausklapp-line and the EinklappLeitung are hydraulically connected to a working cylinder, so that upon actuation of the Ausklapp-line with the first pressure of the piston of the working cylinder extends and upon application of the Einklapp-line with the first pressure of the Piston of the working cylinder retracts.

 By means of the connection of the folding-in line and the folding-out line with at least one working cylinder, the synchronization of the positions of the pistons of the at least one first cylinder and the at least one second cylinder is coupled to an extension of the working cylinder. This ensures that with each extension of the working cylinder, the pistons of the working sections are synchronized with each other. It is therefore not a separate circuit for

Synchronization of the position of the pistons to each other necessary. In one

Agricultural tillage implement with trailing rollers, in which the working cylinder is usually moved frequently and in which the cylinders of the working sections are coupled to the trailing rollers, a constant position of the trailing rollers is therefore ensured relative to the frame. All state changes of the pistons of the first working section relative to the pistons of the second working section, by a leakage, for example in the

Connection can be caused to be compensated when extending the working cylinder. An example of such a working cylinder is a folding cylinder of a disc harrow. This will become the working sections of a Disc harrow with multi-part frame, which can be switched between transport position and working position, folded for transport over a public road to reduce the lateral extent of the device, and lowered in the field by extending the working cylinder to obtain a large working width and the tillage tools in one

To bring work position. Thus, with each use of the disc harrow on the field by the extension automatically synchronized the position of the working sections to each other.

Alternatively, the Ausklapp-line may be connected to the ring side of the working cylinder and the Einklapp-line with the piston side of the working cylinder. In this case, in the above example would be a synchronization

the positions of the piston of the at least one first cylinder and the at least one second cylinder when folding the disc harrow carried out in the transport position.

In a further preferred embodiment, the pressure medium supply is hydraulically connected to a folding-in line, wherein the folding-in line is hydraulically connected via the first and a second interruptible connection to the ring side of the at least one first cylinder and the ring side of the at least one second cylinder. In this case, the connecting line between the ring side of the at least one first cylinder and the piston side of the at least one second cylinder on a fourth interruptible connection. Preferably, the first, second and / or fourth interruptible connection is a releasable seat-tight valve, particularly preferably a check valve. At a

If the folding line is subjected to the first pressure, the first and second interruptible connections are not interrupted while the fourth interruptible connection is interrupted. Thus, the piston side of the at least one second cylinder is not exposed to the first pressure when the connecting line is exposed to the first pressure. Consequently, the piston of the at least one first cylinder and the piston of the at least one second cylinder move to their retracted end position. In this retracted end position, it is ensured that the pistons are in a mutually defined position and are hydraulically coupled to the pressure medium via the complete filling of the volume defined by the connecting line and a part of at least one of the at least one first cylinder and the at least one second cylinder , When the interruptible connection, via which the pressure is applied to the ring side of the at least one first cylinder and the at least one second cylinder, is interrupted, it is ensured in this retracted end position that the pistons are in a mutually defined position and over the complete Filling the by the

Connecting line and a part of at least one of the at least one first cylinder and the at least one second cylinder volume defined are hydraulically coupled to the pressure medium.

 However, even simpler embodiments of the adjusting device are possible, which dispense with the further-forming features described above.

In a preferred embodiment, the pressure medium supply with a

Ausklapp-line hydraulically connected, wherein the Ausklapp-line via at least two third interruptible connections, which are preferably seat-tight valves, particularly preferably check valves, with the piston side of the at least one first cylinder and the piston side of the at least one second cylinder is hydraulically connected. When the fold-out line is acted upon by the first pressure, the first to fourth interruptible connections are interrupted so that the pistons of the at least one first cylinder and of the at least one second cylinder do not move. The Einklapp-line and the Ausklapp-line are hydraulically connected to a working cylinder, so that when an act of loading the Ausklapp-line with the first pressure of the piston of the working cylinder extends and upon application of EinklappLeitung with the first pressure of the piston of the working Cylinder retracts.

With this development, the synchronization of the positions of the piston of the at least one first cylinder and the at least one second cylinder is coupled with a retraction of the working cylinder via the connection of the folding line and the Ausklapp line with at least one working cylinder. About the Interruptible connections ensures that, by extending the working cylinder, there is no change in the positions of the pistons of the at least one first cylinder and of the at least one second cylinder.

 Alternatively, the Ausklapp-line can not be connected via the third interruptible connections with the piston sides of the at least one first cylinder and the at least one second cylinder. Instead, the Ausklapp- line is individually controlled by the pressure medium supply, such as its own valve, while a line is performed with the third interruptible connections to a reservoir or a surge tank. Likewise, the line with the two third interruptible connections to a valve

connected and thus a filling with and a discharge of pressure medium from the piston chamber of the at least one first cylinder and the at least one second cylinder are made possible.

In a preferred development, the piston side of the at least one first cylinder is hydraulically connected to a cylinder extension line, and the ring side of the at least one second cylinder is connected to a cylinder inlet line

hydraulically connected, wherein the ZylinderSusfahrleitung and the cylinder-Einfahrleitung are hydraulically connected to a second pressure medium supply for providing a pressurized medium under a second pressure. Upon actuation of the cylinder extension line or the cylinder entry line with the second pressure, the first, second and third interruptible connections are interrupted and the fourth interruptible connection is not interrupted.

As a result, the piston of the at least one first cylinder and the piston of the at least one second cylinder move when the cylinder extension line is pressurized with the second pressure, and when the cylinder inlet line is pressurized with the second pressure, the piston of the at least one first cylinder and the piston of the at least one second cylinder.

 Through this development, it is possible via the cylinder inlet line and the cylinder extension line to adjust the position of the cylinder and thus the height of the frame above the ground synchronous to each other. As during a

Actuation of the cylinder inlet line or the cylinder exhaust line with the second pressure, the first, second and third interruptible connection are interrupted, no pressure medium through these connections to the first

Flow down pressure medium supply or a reservoir located therein. However, since the fourth interruptible connection is not interrupted, the amount of the pressurized medium, which completely fills the volume defined by the connection line and a part of at least one of the at least one first cylinder and the at least one second cylinder, can continue the movement of the at least couple a first cylinder with the at least one second cylinder.

Preferably, the fourth interruptible connection is a sealed control piston. Alternatively, the fourth interruptible connection can also be a controllable

Check valve, a proportional valve or another valve that is open in the direction of the ring side of the at least one first cylinder and in the direction of the piston side of the at least one second cylinder is open only when pressure on the cylinder extension line.

Furthermore, the present invention provides a method for operating a hydraulic adjusting device for adjusting an agricultural

Soil preparation device ready. According to the method, a pressurized pressure medium is provided which is introduced into a connection line which hydraulically connects the ring side of at least one first cylinder to the piston side of at least one second cylinder. The pressure is applied to the piston of the at least one first cylinder and the piston of the at least one second cylinder and the piston of the at least one first cylinder and the piston of the at least one second cylinder is moved into an end position. A defined by the connecting line and a part of at least one of the at least one first cylinder and the at least one second cylinder volume is completely filled with an amount of the pressure medium and the piston of the at least one first cylinder and the piston of the at least one second cylinder by this amount together coupled so that the position of the piston of the cylinder is fixed relative to each other.

 By applying this method, in particular to an adjusting device as described above, the advantageous effects of the invention can be achieved.

At the same time, the pressure on a fold-out line connected to a working cylinder and all sides of the piston and all ring sides of the at least one first cylinder and the at least one second cylinder are preferably applied simultaneously and the piston of the working cylinder is simultaneously extended and the piston of the at least one extended first cylinder and the piston of the at least one second cylinder in an extended end position.

More preferably, the pressure is simultaneously applied to a folding-in line connected to a working cylinder and all annular sides of the at least one first cylinder and the at least one second cylinder and at the same time the piston of the working cylinder retracted and the piston of the at least one first cylinder and the piston of the at least one second cylinder retracted into a retracted end position.

 Further preferred features and advantages will be apparent from the following description of the figures and the totality of the claims.

The invention is explained in more detail in the following section by means of embodiments with reference to the accompanying figures.

Figure 1 shows a hydraulic circuit diagram of a hydraulic actuating device according to an embodiment of the present invention.

FIG. 2 shows a hydraulic circuit diagram of a hydraulic actuating device according to a further exemplary embodiment of the present invention. FIG. 3 shows an agricultural tillage implement in the form of a

Disc harrow with a hydraulic adjusting device after a

Embodiment of the present invention.

In the figures, the same reference numerals designate the same or functionally identical components, unless indicated otherwise.

1 shows a hydraulic circuit diagram of a hydraulic actuating device according to a first preferred embodiment, which has a first pressure medium supply 1 for providing a pressurized pressure medium. The pressure medium supply has a pressure line 2 and a reservoir 3. The adjusting device furthermore has a first working section 4 and a second

Working section 5, wherein the first working section 4 has two first cylinder 6, 6a the same size and the second working section 5 has two second cylinder 7, 7a the same size. The cylinders 6, 6a, 7, 7a are each designed to be double-acting and have a hydraulic connection on their piston side and a hydraulic connection on their ring side. Within the

Working sections, the cylinders are hydraulically connected in parallel, so it is the piston sides of the two first cylinders 6, 6a connected to each other hydraulically and the ring sides of the two first cylinders 6, 6a connected to each other hydraulically, the same applies accordingly for the two second cylinder 7, 7a. By this hydraulic parallel circuit, it is the piston of the cylinder 6, 6a, 7, 7a possible to oscillate their set position relative to each other and the previous

avoid complex and costly pendulum mechanics.

Via a connecting line 11, the annular sides of the two first cylinders 6, 6a are hydraulically connected to the piston sides of the two second cylinders 7, 7a. The two first cylinders 6, 6a are designed as master cylinders and the two second cylinders 7, 7a as slave cylinders. Consequently, the annular surface of the two first cylinders 6, 6a substantially corresponds to the piston surface of the two second cylinders 7, 7a. This area ratio ensures a hydraulic synchronization, through which the pistons of the cylinders of both working sections travel the same way when one side is actuated. The connecting line 11 is so to a first interruptible connection 14, preferably a pilot-operated check valve or another seat-tight connection, connected at any time pressure medium between the ring side of the master cylinder and the

Piston side of the slave cylinder can be moved, but in the interrupted state no pressure medium can escape via the interruptible connection 14.

 The piston sides of the master cylinders 6, 6a of the first working section 4 are hydraulically connected via a master line 9 to a second interruptible connection 12, preferably a check valve or another seat-tight seal

Connection, connected and the ring sides of the slave cylinder 7, 7a are connected via a slave line to a third interruptible connection 13, preferably a pilot-operated check valve or another seat-tight connection. The first, second and third interruptible connection 12, 13, 14 are connected to a synchronous line 15. The interruptible connections are preferably designed so that they are only connected when pressure is applied to the synchronizing line 15.

The hydraulic adjusting device further comprises a second pressure medium supply 18 with a pressure line 19 and a reservoir 20, which via a first locking block 21 both via a cylinder extension line 16 with the piston side of the master cylinder 6, 6a as well as a cylinder inlet line 17 with the Ring side of the slave cylinder 7, 7a is hydraulically connected. The second

Pressure medium supply 18 has a pressure line 19 and a reservoir 20. The first blocking block 21 is characterized in that, when the pressure line 19 is connected to the cylinder extension line 16, it connects the cylinder retraction line 17 to the reservoir 20 and, conversely, when connecting the pressure line 19 to the cylinder retraction line 17, the cylinder extension line 16 the reservoir 20 connects, but otherwise holds the cylinder extension line 16 and the cylinder retraction 17 closed.

The synchronous line 15 is hydraulically connected to a Ausklapp line 23. The Ausklapp-line 23 is hydraulically with the first pressure medium supply 1 connected. Likewise connected hydraulically to the first pressure medium supply 1 is a folding-in line 24.

The Ausklapp-line 23 is hydraulically connected via a second locking block 22 to the piston side of the master cylinder 6, 6a and the Einklapp-line 24 is via the second locking block 22 with the cylinder-Einfahrleitung 17 between the second pressure medium supply 18 and the first locking block 21 connected. The second blocking block 22 is characterized in that the connection of the

Ausklapp-line 23 with the piston side of the master cylinder 6, 6a is only open when the Ausklapp-line 23 or the Einklapp-line 24 is pressurized. Likewise, the connection of the Einklapp-line 24 with the cylinder Einfahrleitung 17 between the second pressure medium supply 18 and the first locking block 21 is only open when the Ausklapp-line 23 or the Einklapp- line 24 is pressurized.

The Ausklapp-line 23 and the Einklapp-line 24 are hydraulically connected via a third locking block 25 with a working cylinder 8. The working cylinder 8 is double-acting and has on its piston side and on its ring side in each case a hydraulic connection. The Ausklapp-line 23 is connected via the third locking block 25 with the piston side of the working cylinder 8 and the Einklapp-line 24 is connected via the third locking block 25 with the ring side of the working cylinder 8. The third blocking block 25 is characterized in that the connection of the Ausklapp-line 23 with the piston side of the working cylinder 8 is only open when the Ausklapp-line 23 or the Einklapp-line 24 is pressurized. Likewise, the connection of the Einklapp-line 24 with the ring side of the working cylinder 8 is only open when the Ausklapp-line 23 or the EinklappLeitung 24 is pressurized.

A hydraulic adjusting device as shown in FIG. 1 can be used, for example, for depth guidance of an agricultural cultivator 100, such as a disc harrow, with two separate working sections 4, 5, as shown in FIG. The tillage implement illustrated therein has a frame 50 on which hollow discs are shown as an example of the tools 60 in two laterally folding work sections 4, 5 are arranged. The working sections 4, 5 are folded to move the tillage implement 100 on the road or in the field to the place of use and unfolded at the site for tillage. In the working direction behind the tools 60 arranged on the frame are for each working section 4, 5 follower rollers 40, 41 for

Re-compaction of the worked soil. The follower rollers 40, 41 can be raised or lowered relative to the frame 50 and thus the

Set machining depth of tools 60. In the lowered state of the cylinder 6, 6a, 7, 7a, the frame 50 is in its highest position above the ground, accordingly, the tools 60 are in their highest position above the ground.

 1, the working cylinder 8 is used to fold and unfold the lateral portions, the first cylinders 6, 6a are used for the flea adjustment of the follower rollers 40 of the first working section 4 and the second cylinders 7, 7a for the flea adjustment of the follower rollers 41 the second working section 5. With this interconnection, it is ensured that the same pressure of the first pressure medium supply 1 is applied to all cylinder connections of the cylinders 6, 6a, 7, 7a when the work sections 4, 5 are folded out, whereby the pistons of the cylinders 6, 6a, 7, 7a up to an extended stop. Thus, the follower rollers 40, 41 are in the lowest position and the tools 60 are accordingly in their highest position on the machined

Underground. The entire volume of the intermediate line 11 and the slave cylinder 7, 7a is completely filled, since at the intermediate line 11, the slave line 9, the master line 10 and the synchronous line 15, the same pressure of the first

Pressure medium supply 1 is applied. As soon as the working sections 4, 5 have assumed their completely unfolded position and the pistons of the cylinders 6, 6a, 7, 7a have been completely extended, the fold-out line 23 is disconnected from the pressure of the first pressure medium supply 1. In this state, the first, second and third interruptible connections 12, 13, 14 are interrupted and the first, second and third blocking blocks 21, 22, 25 are closed. Since all the pistons of the cylinders 6, 6a, 7, 7a of the working sections 4, 5 are fully extended, the same position of the cylinders is defined relative to one another. Furthermore, it is ensured that the volume, which couples the master and slave cylinders is completely filled. Thus, a mutually synchronous movement of the pistons of both working sections 4, 5 is ensured. Both working sections 4, 5 are in this embodiment at each unfolding after transport of the agricultural

Tillage implement synchronized.

 The desired working height of the tools 60 can then be adjusted via the second pressure medium supply 18, and the follower rollers 40, 41 can compensate for uneven floors and bumps by means of hydraulic oscillation, without the tools 60 deviating from their set machining depth.

2 shows a hydraulic circuit diagram of a hydraulic adjusting device according to a second preferred embodiment, which is also a first

Comprising pressure medium supply 1 for providing a pressurized medium under pressure. The first pressure medium supply 1 also has a pressure line 2 and a reservoir 3 in the second embodiment. The

As in the first embodiment, the adjusting device also has a first working section 4 and a second working section 5, wherein the first working section 4 has two first cylinders 6, 6a of the same size and the second working section 5 has two second cylinders 7, 7a of the same size. The cylinders 6, 6a, 7, 7a are each designed to be double-acting as in the first embodiment and have a hydraulic connection on its piston side and a hydraulic connection on its ring side. Within the working sections 4, 5, the cylinders 6, 6a and 7, 7a hydraulically connected in parallel, so it is the piston sides of the two first cylinders 6, 6a connected to each other hydraulically and the ring sides of the two first cylinders 6, 6a hydraulically connected, the same applies mutatis mutandis to the two second cylinder 7, 7a. By means of this hydraulic parallel connection, it is possible for the pistons of the individual working sections to oscillate relative to one another about their set position, as in the first embodiment.

Via a connecting line 11, the annular sides of the two first cylinders 6, 6a are hydraulically connected to the piston sides of the two second cylinders 7, 7a. The two first cylinders 6, 6a are designed as master cylinders and the two second cylinders 7, 7a are designed as slave cylinders. Consequently, the equivalent Ring surface of the two first cylinder 6, 6a substantially the piston surface of the two second cylinder 7, 7a. This area ratio ensures that the pistons of the cylinders of both working sections travel the same way when one side is activated. The connecting line 11 is hydraulically connected via a first interruptible connection 14, preferably a pilot-operated check valve or another seat-tight connection, to a folding-in line 31 and connected via this to the first pressure medium supply 1. The first pressure medium supply 1 is likewise connected to the piston side of the master cylinders 6, 6a via a second interruptible connection 33 via a fold-out line 32, and via the third interruptible connection 34 via the

Intermediate line 11 connected to the piston side of the slave cylinder 7, 7a. This second and third interruptible connection 33, 34 is also preferably carried out as a check valve or another seat-tight connection. They are not interrupted at a pressure on the piston side of the cylinder of the two working sections 4, 5, thereby causing a flow of pressure medium in the direction of

Reservoirs 3 of the first pressure medium supply 1 allow. In a compound of Ausklapp-line 32 with the pressure of the first pressure medium supply 1 but they are interrupted, and on the piston sides of the cylinder 6, 6a, 7, 7a of the two working sections 4, 5, the pressure of the first pressure medium supply 1 is not.

The hydraulic control device in Fig. 2 also has a second

Pressure medium supply 18 with a pressure line 19 and a reservoir 20, which via a first locking block 21 both via a cylinder extension line 36 with the piston side of the master cylinder 6, 6a, as well as a cylinder Einfahrleitung 37 with the ring side of the slave Cylinder 7, 7a is hydraulically connected. The second pressure medium supply 18 has a pressure line 19 and a reservoir 20. The first locking block 21 is characterized in that it connects the cylinder-Einfahrleitung 37 with the reservoir 20 upon application of the pressure of the pressure line 19 to the cylinder extension line 36 and vice versa when applying the pressure of the

Pressure line 19 with the cylinder-Einfahrleitung 37, the cylinder-extension line 36 connects to the reservoir 20, but otherwise the ZylinderEusfahrleitung 36 and the cylinder-Einfahrleitung 37 keeps closed. The Einklapp line 31 is hydraulically connected via a further interruptible connection 35, which is preferably a check valve or another seat-tight connection, with the cylinder Eininleitung 37, that the Einklapp-line 31 and the cylinder-Einfahrleitung 37 are hydraulically connected when on the side of the EinklappLeitung 31 is applied pressure, and are separated when on the side of the retraction line 37, a pressure is applied.

 In the intermediate line 11 is a fifth in the second embodiment

interruptible connection 30 arranged, preferably a releasable

Check valve or other seat-tight connection, which connects the ring side of the master cylinder 6, 6a and the piston side of the slave cylinder 7, 7a only with each other hydraulically when either on the piston side of the slave cylinder 7, 7a a higher pressure is applied on the ring side of the master cylinder 6, 6a or when on the cylinder extension line 36, the pressure of the second

Pressure medium supply 18 is present. Furthermore, the fifth is interruptible

Compound 30 is arranged so that it does not lie between the first interruptible connection 14 and the ring side of the master cylinder 6, 6a.

The Ausklapp-line 32 and the Einklapp-line 31 are hydraulically connected to a working cylinder 8. The working cylinder 8 is double-acting and has on its piston side and on its ring side in each case a hydraulic connection. The Ausklapp-line 23 is connected to the piston side of the working cylinder 8 and the Einklapp-line 24 is connected to the ring side of the working cylinder 8.

The illustrated in Fig. 2 preferred embodiment of a hydraulic

Adjusting device can like the first embodiment for the depth control of an agricultural tillage implement, such as a disc harrow, with two separate working sections 4, 5 are used. When shown in Fig. 2

Embodiment drive the cylinder 6, 6a, 7, 7a at pressure on the EinklappLeitung 31 in its retracted end position while the working sections 4, 5 their

Take transport position. At the same time, via the first interruptible connection 14 and through the piston chamber of the slave cylinder 7, 7a displaced pressure medium, the connecting line 11 and the annular space of the master cylinder 6, 6 a completely filled with pressure medium. As soon as no pressure is applied to the folding line 31, the first interruptible connection 14 is interrupted again and the cylinders 6, 6a, 7, 7a are coupled in a mutually defined position. Also in this case, the pistons of the cylinders 6, 6a, 7, 7a of both working sections 4, 5 are synchronized with each other during each transport.

 About the second pressure medium supply 18, the cylinder inlet line 37 and

Cylinder extension line 36 can then be adjusted to the desired working height of the tools 60. For this purpose, upon actuation of the cylinder extension line 36 with the pressure of the second pressure medium supply 18, the releasable check valve of the fifth interruptible connection 30 is unlocked, so that the pressure medium between the ring side of the master cylinder 6, 6a and the piston side of the slave cylinder 7, 7a can flow. By the in the

Substantially the same area of the ring side of the master cylinder and the piston side of the slave cylinder move the rollers of both working sections by the same amount. Conversely, when the cylinder inlet line 37 is acted upon by the pressure of the second pressure medium supply 18, the pressure medium can also be between the piston side of the slave cylinder 7, 7a and the ring side of the master cylinder 6,

6a, since the check valve of the fifth interruptible connection 30 opens in this direction.

 Due to the hydraulic pendulum option described above can

Follower rollers 40, 41 compensate for bumps and bumps without the tools 60 deviating from their set machining depth.

Fig. 3 shows a disc harrow as an example of an agricultural

Soil cultivation device 100, in which with a hydraulic adjusting device according to the invention, the processing height can be adjusted and the

Caster rollers 40, 41 of the working sections 4, 5 can swing hydraulically according to the schemes described above. In the tillage implement 100 shown are located on both sides of a supporting frame 50 (relative to the direction of travel), the two working sections 4 and 5. Each working section 4, 5 comprises one each over a working cylinder 8 between a (not shown) transport position and the work position shown convertible folding frame 51, 52, each with two rows of hollow discs 60, wherein in

Driving direction behind the hollow discs 60 via a pendulum frame 70, 71, the follower rollers 40, 41 are arranged. In the pendulum frame 70, 71, the above-described first and second cylinders 6, 6a, 7, 7a arranged so that the relative position of the follower rollers 40, 41 to the snap frames 51, 52 via an extension or retraction of the pistons of the first and second Cylinder 6, 6a, 7, 7a can be adjusted.

In a fully extended state of the first and second cylinders 6, 6a, 7, 7a, the follower rollers 40, 41 are in their lowest position relative to the

Folding frame 51, 52, the hollow discs 60 of the working sections 4, 5 are

accordingly in their highest working position with respect to the ground. By retracting the pistons of the first and second cylinders 6, 6a, 7, 7a, the working sections 4, 5 are lowered to the desired machining depth. In this position, the follower rollers 40, 41 via the hydraulic

Adjustment device oscillate about their set position and thus compensate for uneven floors and ensure a uniform reconsolidation.

LIST OF REFERENCES

1 first pressure medium supply

 2 pressure line

 3 reservoir

 4 first working section

 5 second working section

 6 first cylinder 6a first cylinder

 7 second cylinder 7a second cylinder

 8 working cylinders

 9 master line

 10 slave line

 11 intermediate line

 12 second interruptible connection

 13 third interruptible connection

 14 first interruptible connection

 15 synchronous line

 16 extension line

 17 entry line

 18 second pressure medium supply

 19 pressure line

 20 reservoir

 21 first blocking block

 22 second blocking block

 23 fold-out line

 24 folding line

 25 third blocking block

 30 fifth interruptible connection

 31 folding line

 32 fold-out line

 33 second interruptible connection

34 third interruptible connection 35 fourth interruptible connection

 36 cylinder extension line

37 cylinder entry line

 4 0 follower rollers

4 1 follower rollers

 50 frames

 51 snap frames

 52 snap frames

60 tool

70 pendulum frame

 71 pendulum frame

 100 agricultural tillage implement

Claims

claims 1. Hydraulic actuating device for an agricultural tillage implement comprising: a first pressure medium supply (1) for providing a pressurized pressure medium, at least one first working section (4) and one second working section (5), wherein the first working section (4) has at least one first cylinder (6) and the second working section (5) has at least one second cylinder (7), the cylinders ( 6, 7) are each double-acting and have a hydraulic connection on their piston side and a hydraulic connection on their ring side, wherein a connecting line (11) hydraulically connects the ring side of the at least one first cylinder (6) to the piston side of the at least one second cylinder (7), characterized in that the piston of the at least one first cylinder (6) and the piston of the at least one second cylinder (7) can be brought into an end position by applying the pressure in each case, wherein the connection line (11) can be exposed to pressure by a first interruptible connection (14), in the end position, a quantity of the pressurized pressure medium completely fills up the volume defined by the connecting line (11) and a part of at least one of the at least one first cylinder (6) and the at least one second cylinder (7), so that the piston of the at least one first cylinder (6) and the piston of the at least one second cylinder (7) are coupled together by this amount and their position is fixed relative to each other when the interruptible connection (14) is interrupted. 2. Hydraulic actuating device according to claim 1, wherein the at least one first cylinder (6) is designed as a master cylinder and the at least one second cylinder (7) is designed as a slave cylinder, so that an annular surface of the at least one first cylinder (6) corresponds to a piston surface of the at least one second cylinder (7). 3. Hydraulic actuating device according to one of the preceding claims, wherein the first working section (4) has at least two first cylinders (6, 6a) and the second working section (5) has at least two second cylinders (7, 7a), wherein the first cylinders (6, 6a) are hydraulically connected to each other in parallel and the second cylinders (7, 7a) are hydraulically connected to each other in parallel, so that all the piston surfaces of the first cylinders (6, 6a) are hydraulically connected to each other, all the piston surfaces of the second cylinder (7, 7a) hydraulically with each other are connected, all annular surfaces of the first cylinder (6, 6a) are hydraulically connected to each other and all annular surfaces of the second cylinder (7, 7a) are hydraulically connected to each other, so that the pistons of a working section can each oscillate relative to each other. 4. Hydraulic adjusting device according to one of the preceding claims, wherein the connecting line (1 1) and all hydraulic connections of the at least one first cylinder (6) and the at least one second cylinder (7) can be connected simultaneously with the pressure of the first pressure medium supply (1), so that the piston of the at least one first cylinder (6) and the piston of the at least one second cylinder (7 ) when pressurized up to an extended end position. 5. Hydraulic actuating device according to one of the preceding claims, wherein the piston side of the at least one first cylinder (6) is hydraulically connected to a master line (9), the ring side of the at least one second cylinder (7) is hydraulically connected to a slave line (10), wherein the master line (9) has a second interruptible connection (12) and the slave line (10) has a third interruptible connection (13), wherein the first, second and third interruptible connection (12, 13, 14) a synchronous line (15) are connected, wherein the synchronous line (15) is connected to the first pressure medium supply (1), wherein the first, second and / or third interruptible connection (12, 13, 14) preferably a releasable seat-tight valve, particularly preferably a Check valve is. 6. Hydraulic actuating device according to one of the preceding claims, wherein the piston side of the at least one first cylinder (6) with a cylinder extension line (16) is hydraulically connected and the ring side of the at least one second cylinder (7) is hydraulically connected to a cylinder retraction line (17), wherein the cylinder extension line (16) and the cylinder entrance line (17) with a second  Pressure medium supply (18) for providing a pressurized medium under a second pressure are hydraulically connected, wherein in a deployed condition, the cylinder exhaust passage (16) is pressurized with the second pressure, wherein in a retracted state the cylinder intake line (17) is pressurized with the second pressure, so that the pistons of the at least one first cylinder (6) and the at least one second cylinder (7) extend in the extended state and retract the pistons of the at least one first cylinder (6) and the at least one second cylinder (7) in the retracted state. 7. Hydraulic actuating device according to claim 5 and 6, wherein the first Pressure medium supply (1) with a AusklappLeitung (23) and with a Einklapp- line (24) is hydraulically connected, wherein the Ausklapp line (23) with the synchronous line (15) and with the Piston side of the at least one first cylinder (6) is hydraulically connected, wherein the Einklapp-line (24) with the ZylinderEinfahrleitung (17) is hydraulically connected, such that upon actuation of the AusklappLeitung (23) with the first pressure, the synchronous line (15) is pressurized, the first, second and third interruptible connection (12, 13, 14) are not interrupted and the piston side and the ring side of at least a first cylinder (6) and the piston side and the ring side of the at least one second cylinder (7) are subjected to the first pressure, wherein upon application of the Einklapp-line (24) with the pressure, the first, second and third interruptible connection (12, 13, 14) are interrupted and the ring side of the at least one second cylinder (7) is pressurized. 8th . Hydraulic actuating device according to claim 7, wherein the fold-out line (23) and the fold-in line (24) are hydraulically connected to a working cylinder (8), so that upon actuation of the AusklappLeitung (23) with the first pressure of the piston of the working cylinder (8) extends and retracts upon application of the Einklapp-line (24) with the first pressure of the piston of the working cylinder (8). 9. Hydraulic actuating device according to one of claims 1 to 3, wherein the pressure medium supply (1) is hydraulically connected to a EinklappLeitung (31), wherein the Einklapp-line (31) via the first and a second interruptible connection (14, 35) to the ring side of the at least one first cylinder (6) and the ring side of the at least one second cylinder (7) is hydraulically connected, wherein the connecting line (11) has a fourth interruptible connection (30) between the ring side of the at least one first cylinder (6) and the piston side of the at least one second cylinder (7), wherein the first, second and / or fourth interruptible connection (14, 30, 35) is a seat-tight valve, preferably a check valve, so that when the Einklappleitung (31) with the first pressure, the first and second interruptible connection (14, 35) is not interrupted, the fourth interruptible connection (30) is interrupted and the Piston side of the at least one second cylinder (7) is not exposed to the first pressure when the connecting line (11) is exposed to the first pressure, so that the piston of the at least one first cylinder (6) and the piston of the at least one second cylinder (7) moved to a retracted end position. io. Hydraulic actuating device according to claim 9, wherein the pressure medium supply (1) with a AusklappLeitung (32) is hydraulically connected, wherein the Ausklapp line (32) over at least two third interruptible Compounds (33, 34) which are preferred  Check valves are, with the piston side of the at least one first cylinder (6) and the piston side of the at least one second cylinder (7) is hydraulically connected, wherein when the Ausklapp-line (32) with the first pressure, the first to fourth interruptible connection (14, 30, 33, 34, 35) are interrupted, so that the piston of the at least one first cylinder (6) and the at least one second cylinder (7) do not proceed, the fold-in line (31) and the fold-out line (32) being hydraulically connected to a working cylinder (8), so that upon application of the AusklappLeitung (32) with the first pressure of the piston of the working cylinder (8) extends and retracts upon application of the Einklapp-line (31) with the first pressure of the piston of the working cylinder (8). 11. Hydraulic actuating device according to claim 9 or 10, wherein the piston side of the at least one first cylinder (6) is hydraulically connected to a cylinder extension line (36) and the ring side of the at least one second cylinder (7) is hydraulically connected to a cylinder retraction line (37), wherein the cylinder extension line (36) and the cylinder entry line (37) are connected to a second  Pressure medium supply (18) for providing a pressurized medium under a second pressure are hydraulically connected, when the cylinder extension line (36) or the cylinder inlet line (37) is pressurized with the second pressure, the first, second and third interruptible connection (14, 33, 34, 35) are interrupted and the fourth interruptible connection (30) is not interrupted, such that when the cylinder extension line (36) is acted upon by the second pressure, the piston of the at least a first cylinder (6) and the piston of the at least one second cylinder (7) extend and upon actuation of the ZylinderEinfahrleitung (37) with the second pressure of the piston of the at least one first cylinder (6) and the piston of the at least one second cylinder (7) retract. 12. A method of operating a hydraulic actuator for adjusting an agricultural tillage implement comprising providing a pressurized pressure medium,  Introducing the pressure medium into a connecting line (11) which hydraulically connects the ring side of at least one first cylinder (6) to the piston side of at least one second cylinder (7), characterized by Applying the pressure to the piston of the at least one first cylinder (6) and the piston of the at least one second cylinder (7) and moving the piston of the at least one first cylinder (6) and the piston of the at least one second cylinder (7) into one End position, complete filling of a through the connecting line (11) and a part of at least one of the at least one first cylinder (6) and the at least one second cylinder (7) defined volume with an amount of the pressure medium and Coupling of the piston of the at least one first cylinder (6) and the piston of the at least one second cylinder (7) by this amount with each other, so that their position is fixed relative to each other. 13. A method for operating a hydraulic adjusting device according to claim 12 wherein the hydraulic adjusting device is an adjusting device according to one of claims 1 to 11. 14. Method for operating a hydraulic actuating device according to claim 12 or 13 comprising simultaneously applying the pressure to a working cylinder (8) connected Ausklapp-line (23) and all sides of the piston and all sides of the ring at least one first cylinder (6) and the at least one second cylinder (7) and simultaneous extension of the piston of the working cylinder (8) and extension of the piston of the at least one first cylinder (6) and the piston of the at least one second cylinder (7) in an extended end position. 15. Method for operating a hydraulic actuating device according to claim 12 or 13 comprising simultaneous application of the pressure to a folding-in line (32) connected to a working cylinder (8) and all annular sides of the at least one first cylinder (6) and the at least one second cylinder (7) and simultaneous retraction of the piston of the working cylinder (8) and retraction of the piston of the at least one first cylinder (6) and the piston of the at least one second cylinder (7) in a retracted end position.