EP3643928B1 - Hydraulic control assembly - Google Patents

Description

The present invention relates to a hydraulic control arrangement which is particularly suitable for driving a press, in particular a press brake.

Such control arrangements are known in principle. So shows the DE 10 2016 119 823 A1 a hydraulic press control in which a fluid container is provided, to which a valve block is built in a niche-like recess. In addition, the fluid container has a further separate mounting surface for an electric motor, which drives a pump arranged in the fluid container. In addition, a connection block is inserted into the fluid container through an opening that has been cut free. The valve block, a cylinder and a suction valve are attached to the connection block.

Although the use of a valve block and a connection block can save effort on hoses and pipes, the installation of the connection block in the fluid container, however, requires complex welding work. In addition, hoses must be arranged in the fluid container in order to connect at least the pump to the connection block. A pump arranged in the fluid container is acoustically disruptive in the case of a free-standing fluid container. In addition, the direct attachment of the cylinder to the connection block allows little flexibility in the selection and arrangement of the cylinder.

Another hydraulic press control shows the WO 2018/029019 A1 . In this press control, a type of connection block is provided, on which a valve block, a separate electric motor-pump arrangement and a fluid container and a cylinder are arranged on different sides. The pump, the connection block, the valve block and the tank are connected via hydraulic interfaces; such an interface is specified as an SAE flange.

Even with this arrangement you can manage with little piping or hoses, but a freely mounted electric motor-pump arrangement is acoustically unfavorable. In addition, the direct attachment of the cylinder to the connection block also allows little flexibility in the selection and arrangement of the cylinder. In addition, the fairly branched arrangement of the mostly metallic components would require additional effort in terms of suitable mechanical support for the individual components and, overall, have an unfavorable acoustic radiation behavior.

the JP 2006 183849 A discloses a valve block which is composed of individual sub-valve blocks. Each partial valve block has a continuous tank channel with respective openings on opposite sides. This creates a continuous tank line of the higher-level valve block when the individual sub-valve blocks are put together.

the DE 10 2009 052 531 A1 discloses a hydraulic drive for the upper tool carrier of a machine press, with a hydraulic pump being integrated into a so-called control, valve and line block. A pressure accumulator is also flanged to this block.

the JP 57018526 A discloses a hydraulic unit for supplying a lifting cylinder of a dump truck, in which a pump, a valve and an oil tank are integrally combined.

the US 2007/0108836 A1 discloses a hydraulic control arrangement according to the preamble of claim 1. It relates to an electrohydraulic brake system, the pump of which is driven by an electric motor and is integrated in a valve block. A side wall of a tank rests against a side wall of the valve block.

Disclosure of the invention

The present invention deviates from this state of the art or goes beyond this to provide a flexible hydraulic control arrangement which, moreover, is compact and has favorable acoustic properties.

The invention is specified by a hydraulic control arrangement according to the features of claim 1.

The hydraulic control arrangement according to the invention is particularly suitable for a press, and in particular for a press brake, and has a hydraulic control block which has channels, hydraulic connections and mounting surfaces for valves and / or installation bores for valves, a pressureless fluid container for hydraulic fluid, which with one of its Container walls is arranged opposite a first side surface of the control block, a hydraulic machine for conveying hydraulic fluid between at least the connections and / or between the fluid container and at least one of the connections, and an electric motor which is arranged to drive the hydraulic machine.

The special feature of the invention is, among other things, that the hydraulic machine is arranged in an installation space in the control block, and that a suction fluid path, via which the hydraulic machine can suck in fluid from the fluid container during operation, through the first side surface of the control block and through the said container wall is passed through.

Due to this arrangement of the hydraulic machine in the control block and the arrangement of the fluid container directly next to the control block, the hydraulic control arrangement according to the invention can be built very compact and also has excellent acoustic behavior. With regard to the cylinders to be used, full flexibility is retained, since the cylinders can be connected to the usual connections of the control block using a hose connection. However, only hose lines or pipes to the cylinder used are necessary. The arrangement of the hydraulic machine in the control block muffles the operating noise of the hydraulic machine. The heavy control block also dampens structure-borne noise from the hydraulic machine, as it can only be acoustically stimulated in the low-frequency range. In addition, very little acoustic energy is introduced into the fluid container by the control block and, accordingly, is not radiated from the fluid container. If the fluid container has walls made of a comparatively flexible material, it additionally dampens acoustic vibrations of the control block. Therefore, according to the invention, the entire arrangement comprising the control block with the hydraulic machine arranged therein and the fluid container has improved acoustic properties.

Due to the compact arrangement of the control block and the fluid container, they can also be easily mounted on a common base plate, so that a compact, integrated hydraulic drive module is created for a press or a press brake, for example. There all fluidic control functions for a press, for example, can be represented by valves in the control block and / or by the hydraulic machine inserted in the control block, apart from the already mentioned connections of the cylinder with hoses, no further manual work is necessary to make the hydraulic control arrangement basically operational close. In addition, significantly less assembly material and pipe material are required than with a conventional structure. The logistics for such a compact arrangement is also significantly easier than the delivery of a large number of individual components that would then have to be assembled on site. The hydraulic control arrangement can therefore be made available to a customer in an almost usable state. In this regard, the connection of the cylinder also includes the connection of a possible filling valve with a working line and / or control line, since the filling valve is usually arranged on the cylinder, for example in the case of press brakes.

The hydraulic control arrangement according to the present invention can be used, for example, in press brakes, in die bending machines, in hydraulic presses of all types, in pipe forming presses, and generally in cylinder drives, for example in lifting tables. In general, there is a suitability for, for example, vertically or horizontally mounted differential cylinders, with rapid traverse function, possibly using a pulling load, and with power stroke function and the like.

Since the suction fluid path according to the invention has a first transverse bore which opens into the first side surface of the control block opposite the fluid container and this is arranged essentially transversely to an axis of the hydraulic machine, a particularly favorable arrangement of control block, electric motor and the fluid container can be achieved. The arrangement can roughly correspond to a rectangle in which the control block and the electric motor occupy two adjacent quadrants and in which the fluid container occupies the two remaining opposing quadrants. The first transverse bore does not have to be round, but can also be designed as a flat channel or as an oval channel with the aid of modern production methods such as a casting process with printed cores. In this way, volume is saved in the control block and flow resistance is reduced. The first transverse bore can be arranged in a lower part of the control block and thereby enables the construction of a control block small volume, since the first transverse bore uses installation space next to or below the installation space of the hydraulic machine. In addition, the first transverse bore can be connected in a simple manner to a suction connection of the hydraulic machine and / or to several suction valves in the control block. According to the invention, the first transverse bore penetrates the entire control block and emerges again in a second, opposite side surface, where it is optionally closed with a screw plug. A second fluid container, for example, could then be arranged adjacent to the second side surface and likewise be connected to the suction fluid path. The locking screw is omitted in the latter arrangement.

Advantageous further developments of the invention are the subject of the subclaims.

According to a particularly preferred embodiment, the container wall of the fluid container is either arranged directly adjacent to the first side surface of the control block, or there is only a gap between the container wall and the side surface in which a sealant, for example a flat seal, is arranged. In this arrangement, the suction fluid path is guided through opposing openings in the first side surface and the container wall, and a fluid passage is thus formed. The sealant is in Arranged in the area of these openings and now itself has an opening which corresponds to the size and position of the aforementioned openings in the container wall or the side surface. In this way, a particularly space-saving arrangement of the control block and the fluid container is achieved. Flanges or pipelines between the control block and the fluid container can be dispensed with. In the simplest case, fluid could enter a suction opening of the control block directly from the fluid container. In the former case, in which the container wall is arranged directly adjacent to the first side surface of the control block, it would be conceivable to glue the container wall to the side surface, expediently with a mineral oil-resistant adhesive. With sufficient application of the adhesive, a seal between an opening in the container and an opening in the first side surface of the control block can also be achieved. Alternatively, an area around the passage opening in the container wall can also be designed as a sealing surface due to its geometric shape or due to its material. In the second case, in which there is a gap between the control block and the container wall, the acoustic decoupling between the control block and the container wall is improved.

If - in the second-mentioned case - the aforementioned gap is provided, then the sealing means is preferably a flat seal.

A particularly efficient and simple attachment of the container wall to the control block and sealing of the fluid passage of the suction fluid path is achieved if a flange or a pressure plate is attached to the container wall in the interior of the fluid container in the area of this passage. For this purpose, fastening means such as screws are expediently used, with the aid of which the container wall is clamped between the flange or the pressure plate and the first side surface of the control block, possibly with a flat gasket inserted in between.

If the fluid container and in particular the container wall are made of a plastic, on the one hand, low costs can be achieved, and on the other hand, the acoustic properties of the arrangement of control block and fluid container are further improved. The flexible plastic material of the fluid container dampens vibrations particularly well. It can even be said that the fluid container acts as an acoustic-mechanical low-pass filter that absorbs and dampens high-frequency structure-borne noise from the hydraulic machine. A mineral oil-resistant plastic such as polyvinyl chloride (PVC) or polyethylene (PE) is preferably used. If the plastic is milky-transparent, the fill level in the fluid container can be read off at a glance.

The utilization of an approximately rectangular footprint can be increased if the control block has a mounting surface for the electric motor which is oriented essentially perpendicular to the first side surface. The use of space can be further improved if a third side surface, which lies opposite this attachment surface, is aligned flush with the fluid container.

A further improvement is that a return fluid path is also passed through the first side surface of the control block and through the container wall. In principle, the individual design features of the suction fluid path described above can also be applied to the return fluid path. This can be designed as a second transverse bore, optionally emerge on the second side surface, be arranged next to, above and offset to an installation space of the hydraulic machine and also collect numerous inlets from the hydraulic components in the control block as a transverse channel. In particular, the control block can also be provided with a return filter, the outlet connection of which opens into the second transverse bore of the return fluid path.

It is irrelevant which variant of the fluid lead-through is used for the suction fluid path and which variant is used for the return fluid path. Both variants of the fluid feed-through can each be used for the suction fluid path and the return fluid path.

Advantageously, a connection point for the return filter is formed on the control block, which allows a filter replacement cartridge to be screwed on. Such an exchangeable filter cartridge is also easily exchangeable for the end user. It is also available inexpensively for the pressures occurring in the return line of approximately a maximum of five bar.

A further fluid container can also be arranged on the second side surface of the control block, opposite the first side surface in which the transverse channels of the suction fluid path and the return fluid path preferably also open. In this way, the available container capacity can be increased. In addition, a more symmetrical weight distribution of the overall arrangement comprising the control block and then two fluid containers can be achieved.

Further preferably, a support structure is provided on which at least the control block and the fluid container are arranged together. Due to the integration of the hydraulic machine in the control block and the attachment of the electric motor to the control block, a complete hydraulic control arrangement in the form of a mechanically connected module is created. The support structure can be made from mounting rails in an efficient manner.

As mentioned, the control block can be produced by a casting process, for example by iron casting. A sand core that was produced using a 3-D printing process is preferably used. Then, in a particularly simple manner, channels such as the first transverse bore or the second transverse bore can be implemented with a cross-sectional shape that deviates from a circular shape. Due to such a cross-sectional shape, a volume reduction of the control block and reduced flow resistance in the transverse channels can be achieved.

• Figur 1 zeigt die erfindungsgemäßen hydraulische Steueranordnung am Beispiel einer Steuerung für eine Abkantpresse in Form eines hydraulischen Schaltplans,
• Figur 2 zeigt eine tankseitige Außenansicht der erfindungsgemäßen hydraulischen Steueranordnung,
• Figur 3 zeigt eine Steuerblock-seitige Außenansicht der erfindungsgemäßen hydraulischen Steueranordnung,
• Figur 4 zeigt einen Schnitt im Bereich der Durchführungen des Ansaugfluidpfades und des Rücklauffluidpfades zwischen Steuerblock und Fluidbehälter,
• Figur 5 zeigt einen Schnitt im Bereich des Rücklauffilters und der Querbohrung des Rücklauffluidpfades, und
• Figur 6 zeigt einen gestuften Schnitt im Bereich eines Einbauraums der hydraulischen Maschine, jeweils für die erfindungsgemäße Steueranordnung.

The present invention is described in more detail below with reference to the figures.

• Figure 1 shows the hydraulic control arrangement according to the invention using the example of a control for a press brake in the form of a hydraulic circuit diagram,
• Figure 2 shows a tank-side external view of the hydraulic control arrangement according to the invention,
• Figure 3 shows a control block-side external view of the hydraulic control arrangement according to the invention,
• Figure 4 shows a section in the area of the feedthroughs of the suction fluid path and the return fluid path between the control block and the fluid container,
• Figure 5 shows a section in the area of the return filter and the transverse bore of the return fluid path, and
• Figure 6 shows a stepped section in the area of an installation space of the hydraulic machine, in each case for the control arrangement according to the invention.

According to Figure 1 A hydraulic drive arrangement for a press brake has a hydraulic cylinder 2 with a filling valve 80 - also called a suction valve - and a hydraulic control arrangement 1 for controlling the cylinder 2 and the filling valve 80 with hydraulic fluid, usually mineral oil.

The hydraulic control arrangement 1 has a control block 3 and a fluid container 5, optionally a second fluid container 5 '. It is connected to the cylinder 2 and the filling valve 80 at its consumer connections 20 and 22 and at a control connection 24 with the aid of lines, i.e. hoses or pipes. In addition, a working line 26 extends from the filling valve 80 directly to the fluid container 5 in order to ensure a suction function.

The control block 3 has attachment surfaces on which, for example, safety valves 4 are attached, which can block or release a fluid path from a hydraulic machine 10 to the consumer connections 20 and 22. These valves 4 are equipped with switching position monitoring. In addition, there are numerous built-in valves in the control block 3, such as, for example, the check valves 32, which allow fluid to be sucked in from the fluid container 5 to a connection of the hydraulic machine 10. For this purpose, the check valves 32 are connected to a suction line transverse bore 18 in the control block 3. The suction line transverse bore 18 is part of the suction fluid path which is ultimately guided into the fluid container 5 or 5 '.

The control block 3 also has an installation space 28 for a hydraulic machine 10 arranged therein. This installation space is closed off with the aid of a cover or a deflection plate 30. With the help of the deflection plate 30, the connections of the hydraulic machine 10 are guided into the block. Furthermore, an installation space 36 is provided for a clutch 44, through which a drive shaft 42 of the hydraulic machine 10 is connected to an output shaft 46 of the electric motor 9. The electric motor 9 is screwed directly onto the control block 3 and delimits the installation space 36. The speed and the torque of the electric motor 9 can be adjusted via a drive controller 7 in accordance with a default signal.

The control block 3 is also provided with a return filter 12, via which fluid is returned to the fluid container 5 and, if necessary, 5 'by means of a line 14 and a tank line transverse bore 16. The return filter 12 receives fluid from a return line 34 in the control block 3 is supplied, for example fluid which is discharged from the connection 20 via a decompression valve 4 '.

After the safety valves 4 have been switched to their actuating position, the cylinder 2 can be moved up and down by transferring hydraulic fluid between a lower annular chamber of the cylinder 2 and its upper cylinder chamber with the aid of the hydraulic machine 10. Any missing fluid is sucked in from the container 5 or 5 'via the check valves 32. Excess fluid can be fed out via the filling valve 80 if it is unlocked at connection 24 with the aid of the application of control pressure.

To build up a pressure in the upper chamber of the cylinder 2, fluid is sucked in by the hydraulic machine 10 from the container 5 or 5 'and fed via the connection 20 to the upper cylinder chamber of the cylinder 2 and compressed accordingly until the required pressure is reached.

In order to decompress the upper cylinder chamber of the cylinder 2, the connection 20 is relieved with the aid of the decompression valve 4 '. For a subsequent retraction of the cylinder 2, fluid is supplied to the annular chamber by the hydraulic machine 10 via connection 22. Up to a certain speed, fluid can be discharged from the upper cylinder chamber via the valve 4 '. For higher speeds, the filling valve 80 is unlocked.

When the cylinder 2 is extended in rapid traverse under its own weight, the hydraulic machine 10 controls the speed of the cylinder 2 through the amount of fluid discharged from the annular chamber via connection 22. The removed fluid is fed to the upper cylinder chamber via connection 20. A differential amount is sucked in from the fluid container 5 via the filling valve 80 and the line 26.

In the following Figures 2 to 6 the hydraulic control arrangement 1 is shown in physical form in several views and sections.

The view in Figure 2 shows a perspective view in which the fluid container 5 is partially cut open. The control block 3 and the fluid container 5 are arranged on a support frame which is screwed together from mounting rails 40, a front side surface 67 of the control block in this illustration being aligned flush with the fluid container 5. to The safety valves 4 attached to an upper mounting surface of the control block 3 and the return filter 12, designed as a filter replacement cartridge, according to data sheet RE 51478 from the applicant, can be seen. The working connection 20 for the cylinder chamber of a hydraulic cylinder 2, the working connection 22 for the annular chamber and the control connection 24 for a filling valve are formed on the front side surface 67. In addition, the deflection plate 30 is mounted and closes the installation space 28 formed in the interior of the control block 3 for the hydraulic machine 10. In addition, the check valves 32 are inserted into bores.

The fluid container 5 is arranged adjacent to the control block 5. The suction fluid path with an intake connector 62, which opens into the aforementioned suction line transverse bore 18 in the control block 3, is guided through its side wall 52. The suction nozzle 62 is surrounded by a pressure plate 60 on the inside of the container wall 52. A return flow from the control block 3 is also routed through the side wall 52, carried out on the container side by a flange 56 and an outlet nozzle 58. These are fluidly connected to the aforementioned tank line transverse bore 16 in control block 3 in connection. Both the flange 56 and the pressure plate 60 are fastened to the control block 3 with screws 57 penetrating the side wall 52. The type of implementation of the hydraulic fluid paths through the side wall 52 and the attachment to the control block will be explained in greater detail later on the basis of a sectional diagram. Furthermore, a flange 79 is provided on the upper side of the fluid container 5, with the aid of which a working line 26 - the suction line of the filling valve 80 - is connected to the fluid container 5. In the interior of the fluid container 5, a connecting piece 78 is attached to the flange 79 and protrudes into the fluid.

The fluid container is made of a mineral oil-resistant plastic, this can be done efficiently by rotational molding. A possibly UV-resistant polyethylene (PE) or a polyvinyl chloride (PVC) material can be used. The material can be made milky transparent. Then no oil level indicator would be required as the oil level can be seen through the material. However, an oil level indicator can also be installed. A filling opening 6 is expediently made large enough that the flange 56 or the pressure plate 60 can be fitted through it with the screws 57, as well as the connecting pieces 58, 62 and 78. A diameter of 15cm or more is suggested.

the Figure 3 FIG. 11 shows a further perspective view of the hydraulic control arrangement 1 compared to FIG Figure 2 is rotated by about 180 ° around the vertical. The electric motor 9 can also be seen, which is fastened to the rear mounting surface 76 of the control block 3, for example with screws 57. The electric motor 9 covers the installation space 36 of the coupling 44 formed in the interior of the control block 3. The suction line transverse bore 18 and the tank line transverse bore 16 open into the side surface 66 and are closed there with screw plugs 48, at least in the event that only the fluid container 5 and no further fluid container 5 'is present. If an additional fluid container 5 'is provided, this would be arranged on the side surface 66 of the control block 3 and could be connected directly through its wall to the suction line transverse bore 18 and the tank line transverse bore 16. Furthermore, a ventilation opening 38 can be seen, which is used to ventilate the installation space 36 of the coupling 44.

Overall, it can be seen that the hydraulic control arrangement with its support frame, i.e. the mounting rails 40, the control block 3, the electric motor 9 attached to it and the fluid container 5 occupies an approximately rectangular base area. The fluid container 5 takes up approximately two adjacent quadrants of this rectangular base area, the control block 3 and the electric motor 9 each occupy one of the remaining quadrants opposite the fluid container 5. In this way, a particularly space-saving and compact arrangement was achieved.

In the partial cut in Figure 4 the area is shown in which the fluid container 5 with its container wall 52 and the control block 3 with a side surface 64 facing the fluid container 5 are arranged adjacent to one another, namely at the point at which the suction line transverse bore 18 and the tank line transverse bore 16 in the side surface 64 open.

The fluid passage from the mouths in the side surface 64 through the container wall 52 is designed as follows. The mouth of the suction line transverse bore 18 is provided with a thread. The suction connector 62 is screwed into it and is guided through an opening 51 ′ in the container wall 52. Between the side surface 64 of the control block 3 and the container wall 52, the flat seal 50 'is arranged, which also surrounds the suction connector 62 or the aforementioned opening 51'. This flat seal 50 'seals the opening 51' in the container wall 52 from the environment on the outside of the fluid container 5 and allows such a tight supply of fluid from the fluid container 5 through the opening 51 'into the suction line transverse bore 18. The container wall 52 and the flat seal 50' are attached to the side surface 64 of the with the help of a pressure plate 60, another flat seal 54 'and screws 57 Control block 3 pressed so that the flat seal 50 'lies flat and has a certain compression. The screws 57 are guided through bores in the flat seals 50, '54' and the container wall 52 and fastened to the control block 3 in threaded bores (covered, not shown). The flat seal 54 ′ essentially serves to protect the container wall 52 by distributing the pressure of the pressure plate 60 evenly onto the plastic material of the container wall 52.

A variant of this fluid feed-through is shown in connection with the tank line transverse bore 16. The outer flat seal 50 and the opening 51 in the container wall 52 adjoin its opening in the side surface 64. A flange 56 with a flat seal 54 is mounted on the inside of the fluid container 52 - as before with screws 57 - which are fastened in threaded bores of the control block (3). An outlet connection 58 is inserted into the flange 56. The flange 56 with the screws 57 presses the seal 54, the container wall 52 and the seal 50 onto the side surface 64 of the control block 3. This arrangement ensures an outwardly sealed transfer of fluid from the tank line transverse bore 16 through the opening 51 in the container wall 52 and through the flange 56 into the fluid container 5.

It is irrelevant which variant of the fluid lead-through is used for the suction fluid path and which variant is used for the return fluid path. Both variants of the fluid feed-through can each be used for the suction fluid path and the return fluid path.

Instead of the inserted flat gasket 50 or 50 ′, a sealing material could also be applied from the outside to the container wall 52 and then the container wall 52 could be fastened to the control block 3 in the area of the openings 51, 51 ′ by screws. In addition or as an alternative, it is conceivable to fasten the container 5 to its container wall 52 with the aid of an adhesive on the side surface 64 of the control block 3.

If a fluid container 5 'is also arranged on the side surface 66, which is opposite the side surface 64, then the fluid lead-through from the in FIG Side surface 66 also opening transverse bores 16 and 18 in the fluid container 5 'in the same way as just described.

In Figure 5 a section through the control block 3 and the fluid container 52 is shown, in which the return fluid path is shown in more detail. The tank line transverse bore 16 is tightly closed in the side surface 66 with a screw plug 48 and connected to the interior of the fluid container on the opposite side surface 64 with the aid of the flat seal 50 and the opening 51 in the container wall 52. A branch bore in the control block 3 forms a line 14 which leads to a connection point 82 of the return filter 12, here a filter replacement cartridge. From a line section 34, fluid intended for the return is fed to the return filter 12 at this connection point 82. The connection point 82 consists essentially of a threaded sleeve 84 which protrudes over the surface of the control block 3 and which forms an outlet connection for the filter replacement cartridge 12, and an annular groove 86 which represents an inlet connection for the filter replacement cartridge 12. In this control block 3, all return ducts are collected in the line section 34 and fed to the filter 12. However, variants are conceivable according to which return channels open into the tank line transverse bore 16.

Finally shows the Figure 6 a stepped section through the control block 3 and the fluid container 52 in the area of the suction line transverse bore 18 and the installation space 28 of the hydraulic machine 10 or its engine 10 '. The installation space 28 of the hydraulic machine 10 and the installation space 36 of the clutch 44 are arranged one behind the other in the control block 3 along an imaginary axis. They form a step at their transition - since the installation space 36 has a smaller diameter than the installation space 28 - and they are separated from one another by a support ring 72 arranged in front of the step. Rolling bearings 74 are arranged in the support ring 72, on which the engine 10 ′ of the hydraulic machine 10 is supported in a rotatable manner. The installation space 28 is closed off on the front side surface 67 of the control block 3 by the deflection plate 30. The deflection plate 30 in turn receives roller bearings 74 for the engine 10 'and also has channels which lead from the engine 10' into the control block 3. There these channels and thus the connections of the hydraulic machine 10 are connected to the suction line transverse bore 18 via the check valves 32.

The check valves 32 are built-in valves. They are arranged lying somewhat below and to the side of the installation space 28, axially parallel to the engine 10 ', and on the inlet side as said to be connected to the suction line transverse bore 18. The suction line transverse bore 18 penetrates the control block 3 below the installation space 36 approximately in the area of the transition to the installation space 28. It is tightly closed on the side surface 66 with the closure 48. On the side surface 64, the suction line transverse bore 18 is connected at its mouth with the aid of the flat seal 50 'and the opening 51' in the container wall 52 and with the suction nozzle 62 with the fluid inside the fluid container 5.

As already mentioned, the installation space 36 of the coupling 44 is delimited on the one hand by the support ring 72. The drive shaft 42 of the power unit 10 ′ of the hydraulic machine 10 projects into the installation space 36 from a central opening in the support ring 72. With the aid of the coupling 44, the drive shaft 42 is connected to an output shaft 46 of the electric motor 9. The electric motor 9 mounted on the mounting surface 76 at the same time closes off the installation space 36 on the outside of the control block 3.

The arrangement of the hydraulic machine 10 with its engine 10 'in the control block 3 in the essentially closed installation space 28 effectively counteracts the radiation of airborne sound. In addition, the high mass of the control block 3 attenuates the structure-borne noise of the engine 10 '. Compared to a freely mounted hydraulic machine, the mechanically coupled arrangement of engine 10 'and control block 3 has significantly lower natural frequencies and thus a sound emission spectrum that is perceived as more pleasant. Structure-borne noise is additionally attenuated by the fluid container 5 connected to the control block 3, which is coupled to the control block 3 at least on the side surface 64 and via the mounting rails 40 - not only mechanically but also acoustically - and which in turn has container walls made of flexible plastic material . The container walls of the fluid container therefore emit considerably less sound than a metal container, for example.

The arrangement of the engine 10 'with the anti-cavitation valves 32 arranged axially parallel below it and the suction line transverse bore 18 running underneath it also has a high level of efficiency in utilizing the structural volume of the control block 3 the hydraulic valves 4, 4 ', 32 etc. also the hydraulic machine 10 with the engine 10' and even the clutch 44 receives.

The control block is manufactured as a cast iron part. The installation spaces 28 and 36 as well as channels such as the tank line transverse bore 16 and the suction line transverse bore 18 etc. are formed as a sand core and remain almost net shape free of casting material during casting. Due to the successive arrangement of the installation spaces 28 and 36 with accessibility from the side surfaces 67 and 76, the sand core can be removed there very easily after casting. This also applies to the two transverse bores 16 and 18. If you use a 3D printing process for the sand core, duct geometries with a non-round cross-section, for example for the cross bores 16 and 18, can also be displayed very easily. These can therefore be optimized in terms of flow resistance and space requirements.

Reference number

1

Hydraulic control arrangement

2

Hydraulic cylinder

3

Control block

4th

Valves

5

Fluid container

5 '

Fluid container

6th

Filling opening

7th

Drive controller

9

Electric motor, variable speed

10

Hydraulic machine

10 '

Power plant hydraulic machine

12th

Return filter, filter replacement cartridge

14th

management

16

Tank line cross hole

18th

Suction line cross hole

20th

Working connection cylinder space

22nd

Working connection annulus

24

Control connection

26th

Work management suction function

28

Installation space hydromachine

30th

Baffle plate / cover

32

Anti-cavitation valves

34

Return line section

36

Installation space coupling

38

Ventilation clutch

40

Mounting rails

42

drive shaft

44

coupling

46

Output shaft electric motor

48

Screw

50, 50 '

Flat seal

51, 51 '

Opening in the container wall

52

Container wall

54, 54 '

Flat seal

56

flange

57

Fastening screws

58

Outlet port

60

Pressure plate

62

Intake manifold

64

Control block side face

66

second side face control block

67

Third side surface control block

72

Support ring

74

camp

76

Electric motor cultivation area

78

Nozzle suction line

79

flange

80

Filling valves or suction valve

82

Connection point for filter replacement cartridge

84

Threaded sleeve

86

Ring groove

Claims (21)

1. Hydraulic control arrangement, in particular for a press, in particular for a press brake,

   having a hydraulic control block (3), which has channels (14, 16, 18, 34), hydraulic connections (20, 22, 24) and attachment surfaces for valves (4) and/or installation bores for valves (32),

   having a pressureless fluid container (5) for hydraulic fluid, which is arranged with one of its container walls (52) opposite a first side surface (64) of the control block (3),

   having a hydraulic machine (10) for conveying hydraulic fluid between at least the connections (20, 22, 24) and/or between the fluid container (5) and at least one of the connections (20, 22, 24), and

   having an electric motor (9), which is arranged for driving the hydraulic machine (10),

   wherein the hydraulic machine (10) is arranged in an installation space (28) in the control block (3), and

   an intake fluid path (18, 62) via which the hydraulic machine (10) can suck in fluid from the fluid container (5) during operation is guided through the first side surface (64) of the control block (3) and through said one container wall (52), wherein the intake fluid path has a first transverse bore (18) in the hydraulic control block (3) that opens out in the first side surface (64), and wherein the first transverse bore (18) is arranged substantially transversely to an axis of the hydraulic machine (10),

   characterized in that the first transverse bore (18) opens out in a second side surface (66) of the control block (3), wherein the second side surface (66) is arranged opposite the first side surface (64) .
2. Hydraulic control arrangement according to Claim 1, characterized in that the first transverse bore (18) is closed off at the second side surface (66) by way of a closure screw (48).
3. Hydraulic control arrangement according to Claim 1 or 2, characterized in that, on the mouth of the first transverse bore (18) in the first side surface (64), there is fastened an intake connector (62), which projects into the fluid container (5) through a first opening (51') in the container wall (52).
4. Hydraulic control arrangement according to one of the preceding claims, characterized in that the container wall (52) is arranged so as to bear directly against the first side surface (64).
5. Hydraulic control arrangement according to one of Claims 1 to 3, characterized in that, between the container wall (52) and the first side surface (64), there is a gap in which a sealing means (50, 50') is arranged, and in that the intake fluid path (18, 62) is guided through opposite first openings (51') in the first side surface (64) and in the container wall (52), wherein in particular provision is made of an opening - corresponding in size and position to the stated first openings (51') - in the sealing means (50, 50').
6. Hydraulic control arrangement according to Claim 5, characterized in that the sealing means is a first flat seal (50').
7. Hydraulic control arrangement according to Claim 5 or 6, characterized in that, in the interior of the fluid container (5), a flange or a pressing plate (60) is fastened on the container wall (52) in the region of the leadthrough of the intake fluid path (18, 62) by means of fastening means (57), by way of the arrangement of which fastening means the container wall (52) is clamped between the flange (56) or the pressing plate (60) and the first side surface (64).
8. Hydraulic control arrangement according to one of the preceding claims, characterized in that the fluid container (5), and in particular the container wall (52), is produced from a plastic, wherein in particular the plastic is milky transparent, wherein in particular the plastic is a polyethylene or a polyvinyl chloride.
9. Hydraulic control arrangement according to one of the preceding claims, characterized in that an attachment surface (76) for the electric motor (9) at the control block (3) is oriented substantially perpendicularly to the first side surface (64), and wherein in particular a third side surface (67) of the control block (3) is arranged opposite the attachment surface (76) and is oriented so as to be flush with the fluid container (5).
10. Hydraulic control arrangement according to one of the preceding claims, characterized in that a further working line (26), with a connector (78), is guided directly into the fluid container (5) and does not pass through the control block (3), wherein in particular the connector (78) is fastened on the fluid container (5) by way of a flange (79) and a flat seal, or wherein in particular the connector (78) and the flange (79) are manufactured in one piece together with the fluid container (5) as a plastic part.
11. Hydraulic control arrangement according to one of the preceding claims, characterized in that a return-flow fluid path (16, 56, 58) is guided likewise through the first side surface (64) of the control block (3) and through a second opening (51) in said one container wall (52).
12. Hydraulic control arrangement according to Claim 11, characterized in that the return-flow fluid path has a second transverse bore (16), which opens out in the first side surface (64), and wherein the second transverse bore (16) is arranged substantially transversely to an axis of the hydraulic machine (10) .
13. Hydraulic control arrangement according to Claim 12, characterized in that the second transverse bore (16) opens out in the second side surface (66) of the control block (3), and wherein in particular the second transverse bore (16) is closed off at the second side surface (66) by way of a closure screw (48) .
14. Hydraulic control arrangement according to Claim 6 and according to either of Claims 12 and 13, characterized in that the mouth of the second transverse bore (16) in the first side surface (64) and the second opening (51) in the container wall (52) are arranged opposite one another, wherein a second flat seal (50) is arranged between said mouth and the second opening (51) and thus between the first side surface (64) and the container wall (52).
15. Hydraulic control arrangement according to one of Claims 12 to 14, characterized in that a return-flow filter (12) is mounted on the control block (3), and in that an outflow connection of the return-flow filter (12) is connected to the second transverse bore (16).
16. Hydraulic control arrangement according to Claim 15, characterized in that a connection point (82) which allows screwing-on of an exchangeable filter cartridge is formed at the control block (3), wherein in particular the connection point (82) has a central threaded sleeve (84), which projects out of the control block (3), and an annular groove (86), which is arranged around the threaded sleeve.
17. Hydraulic control arrangement according to one of Claims 11 to 16, characterized in that a further fluid container (5') is arranged on the second side surface (66), wherein the intake fluid path (18) and/or the return-flow fluid path (16) are guided from a respective mouth in the second side surface (66) into the further fluid container (5').
18. Hydraulic control arrangement according to one of the preceding claims, characterized in that provision is made of a bearing structure on which at least the control block (3) and the fluid container (5) are jointly arranged, wherein the bearing structure is formed in particular from mounting rails (40).
19. Hydraulic control arrangement according to one of the preceding claims, characterized in that the control block (3) is produced by a casting process, and in that channels in the control block (3), such as the first transverse bore (18) and/or the second transverse bore (16), and in particular the installation space 28 are formed with the aid of a sand core which has been produced by a printing process, wherein in particular the transverse bores (16, 18) have a cross-sectional shape which differs from a circular shape.
20. Hydraulic drive arrangement having a cylinder (2) for moving a movable machine element and having a hydraulic control arrangement (1) according to one of the preceding claims which is connected to the cylinder (2) by way of hydraulic lines.
21. Machine having a hydraulic drive arrangement according to Claim 20 for moving a movably arranged machine element, wherein in particular the machine is a press brake and the movable machine element is a punch.

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