Hydraulic control block and hydraulic axle with control block

Abstract

A hydraulic control block for controlling the supply of pressure medium to a hydraulic cylinder of a hydraulic shaft is disclosed. Furthermore, a hydraulic shaft with a control block is disclosed.

Description

Technical Field

[0001] The invention relates to a hydraulic control block and a hydraulic shaft with the control block. Background Art

[0002] Hydraulic axes, particularly linear axes, and especially compact axes, have hydraulic cylinders in a closed hydraulic circuit or, if necessary, in a partially closed hydraulic circuit to compensate for volume differences. With low oil volumes, the axes can be used to press, join, or close with high dynamics, precision, and force. Typical applications for such axes are presses, injection molding machines, Stewart platforms for simulators, and the like. If the axes have an additional servo drive, they also achieve extremely high positioning accuracy and good electrical / electronic connectivity.

[0003] The applicant's data sheet RD 08137 / 2018-02 shows a servo-hydraulic axis of the type described. The compactly constructed axis has a servo actuator, a hydraulic control block and a hydraulic cylinder, a hydraulic accumulator and control elements such as valves, as well as power electronics.

[0004] In addition to disassembled shaft designs, in which the components are connected to a central control block via hoses, lines, or tubes, compact designs with direct mechanical, hydraulic, and electrical connections to the control block are also possible.

[0005] The control block must be individually adapted in terms of design and production to each specific hydraulic cylinder with regard to the pressure medium volume flow and, in particular, the number of working chambers supplied with pressure medium, which is very costly. Summary of the Invention

[0006] Accordingly, the object of the present invention is to create a more advantageous hydraulic control block for a hydraulic or servohydraulic axis and a corresponding axis with a control block.

[0007] The first object is achieved by a hydraulic control block for controlling the pressure medium supply to hydraulic cylinders of a hydraulic axis, the hydraulic control block having a universal hydraulic circuit structure, from which a specific hydraulic circuit structure can be selectively configured for selectively supplying pressure medium to hydraulic cylinders having different numbers of piston surfaces. The second object is achieved by a hydraulic axis having the above-mentioned hydraulic control block, a hydraulic machine connected to the hydraulic control block, and hydraulic cylinders connected to the hydraulic control block, wherein a specific hydraulic circuit structure adapted at least to the number of piston surfaces is configured from the universal hydraulic circuit structure.

[0008] Advantageous embodiments of the invention are described below.

[0009] A hydraulic control block for controlling the pressure medium supply to a hydraulic cylinder of a hydraulic or servo-hydraulic axis has a hydraulic circuit structure. This hydraulic circuit structure includes, in particular, fixed and switchable hydraulic components and devices, such as pressure medium channels and valves, which are required for control. According to the present invention, the circuit structure generally refers to a plurality of special hydraulic cylinders having different numbers of piston surfaces. A universal circuit structure is one from which a circuit structure from a plurality of special hydraulic circuit structures can be selectively configured. The corresponding circuit structure is assigned to the respective hydraulic cylinder of the special hydraulic cylinders.

[0010] In other words, the control block contains fixed and switchable hydraulic components, in particular components and pressure medium channels, for a plurality of specific circuit configurations. This number of circuit configurations allows a specific circuit configuration to be selectively selected and configured depending on the specific hydraulic cylinder to be controlled by the control block.

[0011] In this way, it is no longer necessary to manufacture a special control block for each special hydraulic cylinder with a special number of piston surfaces. Instead, a universal control block can be manufactured for different special hydraulic cylinders, which brings economies of scale and cost reduction.

[0012] In one embodiment, the hydraulic cylinder has one, two, three, or four piston surfaces. The pressure medium supply to the hydraulic cylinder can be controlled by the control block. In versions with two piston surfaces, the hydraulic cylinder is designed, for example, as a synchronous cylinder or a differential cylinder. With three, four, or more piston surfaces, the design can be a tandem cylinder, a rapid-travel cylinder, or a telescopic cylinder.

[0013] In one embodiment, in a first configured circuit arrangement, a supply connection of the control block, which can be connected to the high-pressure side and the low-pressure side of the hydraulic machine or pump, can be in fluid communication with or with only one working connection of the control block, which working connection in the first circuit arrangement can be fixedly or fixedly assigned to one of the piston surfaces of the hydraulic rod. Such a circuit arrangement can, for example, control hydraulic cylinders in versions with two hydraulic surfaces or hydrostatic working chambers and is known to the applicant under the designations "A" for differential cylinders and "B" for synchronous cylinders.

[0014] In one embodiment, in a configured second circuit arrangement, at least one of the supply connections can be fluidically connected to or in fluid communication with a plurality of working connections of the control block, wherein the plurality of working connections can be fixedly or fixedly assigned to a respective one of the piston surfaces of the hydraulic cylinder in the second circuit arrangement. This circuit arrangement can, for example, control hydraulic cylinders in versions with three or more piston surfaces or hydrostatic working chambers and is known to the applicant as an "E" circuit arrangement.

[0015] In an extension, the control block has one, in particular exactly one or only one, closure device that can be arranged in a removable manner, by which the selective arrangement and / or removal of the closure device and the resulting at least partial hydraulic closure of the flow path in the control block can be configured or one of the line structures can be configured.

[0016] In an advantageous embodiment, the closure means is arranged detachably or accessible from outside the control block.

[0017] The closing means is preferably a screw or a plug which can be arranged in a pressure-resistant manner.

[0018] Alternatively, the closure means can be provided as a valve or valve arrangement which can be actuated according to the desired configuration.

[0019] In one embodiment, the control block has a first and a second supply connection, a first supply connection of which can be fluidically connected to or with the high-pressure side of the hydraulic machine of the axis and a second supply connection of which can be fluidically connected to or with the low-pressure side of the hydraulic machine, and / or vice versa.

[0020] In one embodiment, the control block has a first working flow path or pressure medium channel, which can be fluidically connected to or with the first supply connection, and a second working flow path or pressure medium channel, which can be fluidically connected to or with the second supply connection. Thus, pressure medium can be supplied via the two working flow paths or pressure medium channels to at least a hydraulic cylinder having two, in particular, mutually opposing piston surfaces. Examples of these include differential cylinders and, optionally, synchronous cylinders.

[0021] In an extension, in order to be able to supply pressure medium to the third piston surface via the hydraulic machine, particularly in the case of a tandem cylinder, the control block has a third working flow path or pressure medium channel, which can be fluidically connected to or with the first supply interface in parallel with the first working flow path or pressure medium channel.

[0022] The first and the third working flow path or pressure medium channel preferably branch off from a common connection point.

[0023] In one embodiment of the control block, at least one of the supply connections can be in fluid communication with either only one working flow path or with a plurality of the working flow paths, depending on the configured circuit structure.

[0024] In one embodiment, the control block has a circulation flow path, via which the second working flow path can be in fluid communication with or with the third working flow path.

[0025] This circulating flow path can be used in particular to energetically optimize the “A” circuit structure with the connected differential cylinder.

[0026] For this purpose, in one embodiment, the circulating flow path is switchable according to the cycle.

[0027] The permanent connection or circuit of the circulating flow path corresponds to a short circuit in the "A" circuit configuration with differential cylinder and to the operation of a synchronous cylinder in the "E" circuit configuration.

[0028] In one embodiment, the volume difference, in particular the volume difference from the circulation flow path, is absorbed by the hydraulic accumulator.

[0029] In one embodiment, for controlling the circulation, the control block has a circulation valve in the circulation flow path, via which the circulation flow path can be switched, ie blocked and / or opened.

[0030] The circulation valve can be, for example, an electromagnetically actuated directional valve, in particular a switching valve or a logic valve. The circulation valve can be a 2 / 2-way valve with a blocked position, in particular a spring-loaded negative position, and an actuable flow-through position. Alternatively, the circulation valve can also be a 4 / 2-way valve with two flow-through positions, one of which is a basic position, in particular a spring-loaded negative position, in which the second and third working flow paths are each connected to the valve. In the actuable flow-through position, the second and third working flow paths are connected via two flow cross sections. Alternatively, a seat valve is also possible.

[0031] The circulation valve, but also all other valves mentioned in this document, can be actuated electrically, hydraulically or pneumatically.

[0032] In one embodiment, at least one first working connection branches off from the first working flow path, at least one second working connection branches off from the second working flow path, and at least one third working connection branches off from the third working flow path.

[0033] According to each configured circuit structure, the working connection can be in fluid communication with or with each one of the piston surfaces, and / or the working connection can be closed or is closed. Simple stopping / disabling of the relevant working connection is completed by the described closure.

[0034] In one embodiment, the working connections are grouped together, each of which is assigned to one of the configured circuit structures. The group preferably comprises at least a first working connection and a second working connection, with at least one of the groups comprising a third working connection. Groups with four or more working connections are also possible, depending on the number of piston surfaces of the associated hydraulic cylinders.

[0035] Despite the large number of configurable circuit structures, a development that proves to be less expensive in terms of production technology is that the groups have an intersection. Thus, at least one of the working connections is open and connectable for a plurality of special hydraulic cylinders, i.e., in different, specially configured circuit structures.

[0036] The intersection comprises in particular the first and the second working connection, so that for a hydraulic cylinder with at least two piston surfaces the necessary pressure medium connections to the low-pressure side and the high-pressure side of the hydraulic machine are ensured.

[0037] The groups can be arranged on different sides of the control block for better overview.

[0038] In one embodiment, a valve is arranged in the third working flow path, by means of which this third working flow path can be blocked and opened. This valve can be, in particular, an electromagnetically actuated directional valve, in particular an on-off valve. This valve can be a 2 / 2-way valve with a blocking position, in particular preloaded by a spring, and an actuable flow-through position. The design and actuation alternatives already mentioned above also apply to this valve.

[0039] In an extension of the control block, a connecting flow path is provided which branches off from the first working flow path or is connected to this first working flow path and which opens into the third working flow path in a section of the third working flow path between the last-mentioned valve and the third working connection.

[0040] In one embodiment, the circulation valve can be closed and opened as a function of the actuation of the last-mentioned valve in the third working flow path.

[0041] In one embodiment, a receptacle for a closure means, in particular a closure means according to the above description, is provided in each of the first working flow path and the connecting flow path, wherein the closure means is selectively arranged in only one of the receptacles.

[0042] The receptacles are preferably designed identically, so that only a single connecting element has to be provided for selective arrangement in the receptacles.

[0043] In different designs of the receiving portion, two closure devices are maintained, of which only one of the two closure devices is always arranged in the configured circuit structure and the other is removed respectively. In this way, unintentional incorrect screw connections can also be better avoided.

[0044] In a first configured circuit arrangement, the third working connection or connections are closed, and the closing means are arranged in the receptacle in the first working flow path, while the receptacle in the connecting flow path is empty. This corresponds to the "A" circuit arrangement or the "B" circuit arrangement already mentioned above, wherein the valve in the third working flow path then determines the shutoff or pressure medium supply of the working chamber of the hydraulic cylinder that can be connected to or is connected to the first working connection.

[0045] In a second configured circuit arrangement, the receptacle in the first working flow path is empty, and the closure means is arranged in the receptacle in the connecting flow path. This corresponds to the "E" circuit arrangement already mentioned above, wherein the valve in the third working flow path then determines whether the third working connection is connected to or disconnected from the first supply connection.

[0046] In one embodiment, particularly in an "E" circuit configuration, the first working flow path forms the inlet of a filter, which can be arranged, in particular, in or within the control block. In an "A" circuit configuration or a "B" circuit configuration, sections of the first working flow path, the third working flow path, and the connecting flow path alternatively form the inlet of a filter, which can be arranged, in particular, in or within the control block. In both cases, the filter is always arranged between the high-pressure side and one of the piston surfaces that can be loaded with pressure medium, so that a sufficient pressure medium volume flow through the filter for filtration is always achieved, regardless of the configured circuit configuration.

[0047] In one embodiment, the control block comprises a storage flow path and a hydraulic accumulator that can be fluidically connected to or with the storage flow path. The storage flow path can be fluidically connected to at least two of the working flow paths, in particular the first and second working flow paths, in particular via a respective non-return valve.

[0048] In one embodiment, an electrically or hydraulically actuatable pressure reducing valve is provided, via which the storage flow path can be connected to the first working flow path pressure medium on the one hand and to the second working flow path pressure medium on the other hand.

[0049] The hydraulic axis has a hydraulic control block designed according to at least one of the aforementioned aspects. Furthermore, the universal circuit structure is adapted, via a closure device, to the specific circuit structure of a specific hydraulic cylinder, the working chamber of each hydraulic cylinder being in fluid communication with the corresponding associated working connection. Furthermore, the axis can have a hydraulic press, the high-pressure side and the low-pressure side of which are in fluid communication with the first and second supply connections, respectively.

[0050] The drawings show an exemplary embodiment of a hydraulic control block according to the invention and a hydraulic shaft according to the invention. The invention will now be explained with reference to the drawings.

[0051] In one embodiment, the working connection is arranged and / or designed on the control block in such a way that a first spatial arrangement of the hydraulic cylinders and a second spatial arrangement, in particular rotated relative to the first spatial arrangement, are achieved.

[0052] In one embodiment, at least one safety valve is arranged in the first working flow path and / or the second working flow path, by which the respective working flow path can be blocked. In particular, two safety valves are provided in the working flow path for redundancy. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 A hydraulic axle is shown with a hydraulic control block having a universal hydraulic circuit structure and two configurable special circuit structures;

[0054] Figure 2 The partially transparent stereoscopic view shows the Figure 1 Hydraulic control block;

[0055] Figure 3 The partially transparent side view shows the Figure 1 and 2 The hydraulic control block; and

[0056] Figure 4 The hydraulic control block according to the previous figures is shown in cross section. DETAILED DESCRIPTION

[0057] Hydraulic axis 1 according to Figure 1 There is a hydraulic control block 2, a hydraulic machine 4 connected thereto, and a hydraulic cylinder 6 or 8 supplied with pressure medium by this hydraulic machine and selectively connected to the control block 2. The control block 2 has a conventional hydraulic circuit structure.

[0058] The term "universal" in this document should be understood as meaning that a plurality of special circuit structures can be selectively configured from a universal circuit structure, two of which, namely A and E, are shown in the embodiment shown, wherein, as already mentioned above, circuit structure A can be referred to as B when connecting the synchronous cylinders.

[0059] In other words, the control block 2 contains all necessary fixed and switchable hydraulic components, in particular components and pressure medium channels, in order to be able to configure a plurality of special circuit structures.

[0060] The respective circuit structures A, E are assigned to a specific hydraulic cylinder 6 or 8. Thus, hydraulic cylinder 6 has two working connections, and the hydraulic cylinder 8, shown as an alternative, has three working connections. Each working connection is in fluid communication with a specific piston surface or working chamber of the respective hydraulic cylinder 6, 8. Two different hydraulic cylinder configurations (synchronous / differential) can be connected in circuit structure A (B).

[0061] In detail, the control block 2 has a first supply connection 10 and a second supply connection 14, from which the first working flow path 12 originates and from which the second working flow path 16 originates. The supply connections 10, 14 are designed as supply connectors. Alternatively, they can be configured as access openings or the like in the control block 2.

[0062] One high-pressure side and one low-pressure side of the hydraulic machine 4 are in fluid communication with the supply connections. Depending on the direction of rotation of the hydraulic machine 4, which is designed with a constant delivery volume, the first supply connection 10 can be in fluid communication with the high-pressure side and the second supply connection 14 with the low-pressure side, or vice versa. For further consideration, the first case is assumed.

[0063] The first working flow path 12 has a branch 18, at which a third working flow path 20 branches off. A valve 22 designed as a 2 / 2-way switching valve is arranged in this third working flow path.

[0064] The first working flow path 12 extends further from the branch 18, wherein a filter 24 is arranged in this first working flow path. Two safety valves 26 are arranged in series in the first working flow path 12 and downstream of the filter 24, by which the first working flow path 12 can be redundantly blocked. The safety valves are also designed as 2 / 2-way switching valves in terms of device technology.

[0065] In the continuation of the first working flow path 12, this working flow path has a branch 28. Two first working connections 30A and 30E each branch off from this branch on the other side of the control block.

[0066] A shutoff valve 32 is arranged in the second working flow path 16, by which the second working flow path 16 can be shut off. The second working flow path 16 continues from the second supply connection 14 through the shutoff valve 32 to a branch 34. Two second working connections 36A, 36E branch off from this branch at different sides of the control block 2.

[0067] The third working flow path 20 continues opposite the valve 22 to a branch 38 , from which only the third working connection 40E branches off on that side of the control block 2 where the connections 30E and 36E belonging to the special circuit or configuration E are provided.

[0068] As already mentioned, the hydraulic cylinder 6 with two piston surfaces or the hydraulic cylinder 8 with three piston surfaces can be supplied with pressure medium selectively and depending on the configuration via the control block 2 .

[0069] For this purpose, a connecting flow path 42 is provided, through which the first working flow path 12 can be fluidically connected to the third working flow path 20 downstream of the valve 22. A receptacle 44E is provided in the connecting flow path 42. In the exemplary embodiment, the receptacle 44A, which is designed identically, is provided in the first working flow path 12 in the section between the branch 18 and the inlet of the connecting flow path 42.

[0070] A closure element 46 designed as a screw, in particular an M18×1.5 screw (in this case according to DIN 96), can be inserted or inserted into the corresponding receptacle 44E, 44A. Based on the identical embodiment of the receptacles 44E, 44A with an M18 thread in the exemplary embodiment, exactly one closure element 46 can be inserted into the corresponding receptacle 44E, 44A, depending on the desired configuration E, A.

[0071] exist Figure 1 In the illustrated embodiment, the closure element 46 is inserted into the receptacle 44A, thereby configuring the circuit arrangement A for supplying a hydraulic cylinder with two working spaces or piston surfaces at the working connections 30A and 36A. The working connections 30E, 36E, and 40E of the configurable circuit arrangement E are then closed. Accordingly, the hydraulic cylinder 8 with these connections is optionally shown (dashed-line block).

[0072] In the selected configuration A, the pressure medium can therefore no longer flow directly via the first working flow path 12 to the first working connection 30A, but must flow via a section of the third working flow path 20, the valve 22, and the connecting flow path 42 connected in this configuration A. The valve 22 thus has the function of either supplying the annular chamber of the hydraulic cylinder 6 supplied by the first working connection 30A with pressure medium or blocking it.

[0073] In order to absorb the volume differences resulting from the different piston surface dimensions of the hydraulic cylinders 6 and 8, the hydraulic control block 2 has a storage flow path 48, which can be fluidically connected to the corresponding working flow paths 12 and 16 via a pressure-limiting valve 50, which is preset to a pressure value. A gas-charged hydraulic accumulator 52 is connected to the storage flow path 48.

[0074] In the case of configuration A, all working connections 30E, 36E and 40E for the pressure medium supply for the hydraulic cylinder 8 in configuration E are blocked. The same applies to the third working flow path 20 and its Figure 1 Blind drilled hole shown on the left.

[0075] If circuit structure E is configured, hydraulic cylinder 8 having three working spaces or piston surfaces can be supplied with pressure medium. The closure element 46 is then disassembled and removed from receptacle 44A and inserted into receptacle 44E. Furthermore, working connections 30A and 36A are closed, and working connections 30E, 36E, and 40E are opened, with the third working flow path 20 remaining closed in the blind bore provided in the exemplary embodiment.

[0076] The outlets or working connections 30A, 30E, 36A, 36E, 40E can each be configured as a separate pressure medium channel in the control block 2. Expanding the control block 2 to more than this number of outlets or working connections can increase the variability of the control block, in particular to meet market requirements.

[0077] In circuit configuration E, the pressure medium can then flow via the first working flow path 12, through the branch 18 and the filter 24 directly to the first working connection 30E and thus into the left annular chamber of the tandem cylinder 8. Since the connecting flow path 42 is blocked by the closure device 46 in configuration E, the position of the valve 22 now determines whether the annular chamber connected to the third working connection 40E is supplied with pressure medium.

[0078] If the annular spaces are supplied, the effectively identical annular spaces of the working connections 30E and 40E are thereby loaded with pressure medium, which corresponds to the sum of the areas of the hydraulic cylinder 8 and thus to the power stroke.

[0079] In the case of a power stroke, the hydraulic pump conveys pressure medium from the working chamber of the hydraulic cylinder 8 connected to the second working connection 36E into the working chambers of the hydraulic cylinder connected to the first working connection 30E and the third working connection 40E. The circulation valve 54 is closed for this purpose.

[0080] During the rapid stroke of hydraulic cylinder 8, working connections 36E and 40E are fluidically connected and short-circuited via circulation valve 54. The hydraulic pump then conveys pressure medium from the working chamber connected to second working connection 36E to the working chamber connected to first working connection 30E. The extremely small piston surface of the piston delimiting this working chamber results in high displacement speeds. Thus, the filling or subsequent evacuation of the working chamber connected to third working connection 40E is accomplished solely by circulating volume flow via circulation valve 54, bypassing hydraulic pump 4. The three annular surfaces of hydraulic cylinder 8 are coordinated so that no volume differences, other than those caused by leakage, need be absorbed by hydraulic accumulator 52.

[0081] In the configuration or circuit arrangement A with the differential cylinder 6, pressure medium can flow between the working flow paths 12 and 16 via the circulation valve 54. Here, when the differential cylinder 6 is retracted, the volume difference must always be conveyed to the reservoir 52. The circulation valve 54 enables the differential cylinder 6 to be retracted with low displacement force and at a speed that corresponds to the retraction.

[0082] Figure 2 and 3 The hydraulic control block is shown in a perspective view and a partially transparent side view, with the housings 44A and 44E indicated. They are arranged inside the control block 2 and are accessible from the outside via housing holes. Closure elements 46, M18 screws, can also be inserted and removed through these housing holes. Laterally on the control block 2, there are distributed on several sides for Figure 1 Hole pattern with connection drillings for the valves mentioned in the description.

[0083] according to Figure 4 , the accommodating portions 44A and 44E can be seen in a cross section of the control block.

[0084] A hydraulic control block is disclosed, which has a universal hydraulic circuit structure for selecting possible hydraulic cylinders and for controlling the pressure medium supply of the hydraulic cylinders, the circuit structure being designed to be able to switch from one circuit structure to another specific circuit structure by rearranging one of the components.

[0085] A hydraulic axis or servo-hydraulic axis with a control block is also disclosed.

[0086] Reference Signs List

[0087] 1 hydraulic axis

[0088] 2 Hydraulic control block

[0089] 4 Hydraulic press

[0090] 6; 8 hydraulic cylinders

[0091] 10 First supply connector

[0092] 12 First working flow path

[0093] 14 Second supply connector

[0094] 16 Second working flow path

[0095] 18 Branch Road

[0096] 20 The third work flow path

[0097] 22 valves

[0098] 24 filters

[0099] 26 Safety Valve

[0100] 28 Branch Road

[0101] 30A; 30E first working connector

[0102] 32 stop valve

[0103] 34 Branch Road

[0104] 36A; 36E second working connector

[0105] 38 Branch Road

[0106] 40E third working connector

[0107] 42 connection flow path

[0108] 44A; 44E accommodation portion

[0109] 46 Closure device

[0110] 48 Storage flow path

[0111] 50 Pressure limiting valve

[0112] 52 hydraulic accumulator

[0113] 54 Circulation Valve

[0114] n Number of piston faces

Claims

1. A hydraulic control block (2) for controlling the pressure medium supply of a hydraulic cylinder (6; 8) of a hydraulic axis (1), characterized in that The hydraulic control block (2) has a universal hydraulic circuit structure, and the universal hydraulic circuit structure can selectively configure special hydraulic circuit structures (A, B; E) in order to selectively supply pressure medium to hydraulic cylinders (6; 8) having different numbers of piston surfaces (n=2; n=3). The hydraulic control block (2) comprises: - a first and a second supply connection (10, 14), of which the first supply connection (10) can be fluidically connected to the high-pressure side of the hydraulic machine (4) of the hydraulic axis and the second supply connection (14) can be fluidically connected to the low-pressure side of the hydraulic machine (4), and / or vice versa, a first working flow path (12) capable of fluid communication with the first supply interface (10), a second working flow path (16) capable of fluid communication with the second supply interface (14), a third working flow path (20) which is fluidically connectable to the first supply interface (10) in parallel with the first working flow path (12), a valve (22) in the third working flow path (20), the third working flow path being selectively blocked or opened by the valve (22), a connecting flow path (42), via which the first working flow path (12) can be fluidically connected to the third working flow path (20) in a section of the third working flow path (20) between the valve (22) and the third working connection (40E), wherein at least one first working joint (30A, 30E) branches off from the first working flow path (12), at least one second working joint (36A, 36E) branches off from the second working flow path (16), and at least one third working joint (40E) branches off from the third working flow path (20), wherein the first working flow path (12), the second working flow path (16) and the third working flow path (20) are configured to supply pressure medium to the hydraulic cylinder (6; 8) via the hydraulic machine (4), It comprises a detachably arranged closure device (46), by means of which one of the special hydraulic circuit structures (A, B; E) can be configured through the selective arrangement of the closure device and the consequent at least partial hydraulic closure of the flow path (12, 42) designed in the hydraulic control block (2).

2. The hydraulic control block (2) according to claim 1, wherein: The closure device (46) is detachably arranged so as to be accessible from outside the hydraulic control block (2).

3. The hydraulic control block (2) according to claim 1 or 2, having a circulation flow path, through which the second working flow path (16) can be fluidically connected to the third working flow path (20).

4. The hydraulic control block (2) according to claim 1 or 2, wherein: The first working connection (30A, 30E), the second working connection (36A, 36E) and the third working connection (40E) can be in fluid communication with each of the piston surfaces, and / or wherein, The first working connection (30A, 30E), the second working connection (36A, 36E) and the third working connection (40E) are closable.

5. The hydraulic control block (2) according to claim 1 or 2, comprising a receptacle (44A, 44E) for a closure means (46) in the first working flow path (12) and in the connecting flow path (42), wherein: The closure means (46) is selectively arranged in only one of the receptacles (44A, 44E).

6. The hydraulic control block (2) according to claim 5, wherein: In a first configuration (A, B) of the special hydraulic line structure (A, B; E), the one or more third working connections (40E) are closed and the closing device (46) is arranged in a receptacle (44A) in the first working flow path (12), wherein the receptacle (44E) in the connecting path (42) is empty.

7. The hydraulic control block (2) according to claim 6, wherein: In a second configuration (E) of the special hydraulic circuit structure (A, B; E), the receptacle (44A) in the first working flow path (12) is empty and the closure device (46) is arranged in the receptacle (44E) in the connecting flow path (42).

8. A hydraulic axle comprising a hydraulic control block (2) designed according to any one of claims 1 to 7, a hydraulic machine (4) connected to the hydraulic control block (2), and a hydraulic cylinder (6; 8) connected to the hydraulic control block (2), wherein: A special hydraulic circuit structure (A, B; E) adapted at least to the number of piston surfaces (n=2; n=3) is configured from the universal hydraulic circuit structure.

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