DE102018218113A1 - Hydraulic control arrangement - Google Patents

Abstract

The hydraulic control arrangement according to the invention has a hydraulic control block which has channels, hydraulic connections and mounting surfaces for valves and / or mounting holes for valves, a pressureless fluid container for hydraulic fluid, which is arranged with one of its container walls opposite a first side surface of the control block, a hydraulic machine for Pumping 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, inter alia, that the hydraulic machine in an installation space in is arranged in the control block, and that a suction fluid path, through which the hydraulic machine can draw fluid from the fluid container during operation, passes through the first side face of the control block and through said container wall rt is.

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 generally known. So it shows DE 10 2016 119 823 A1 a hydraulic press control, in which a fluid container is provided, to which a valve block is attached in a niche-like recess. In addition, the fluid container has a further separate mounting surface for an electric motor that drives a pump arranged in the fluid container. In addition, a connection block is inserted into the fluid container through a cut-out opening. 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 time and effort for hoses and pipes, the installation of the connection block in the fluid container 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 disturbing in 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 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, as well as 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 a SAE flange.

Even with this arrangement one can get by 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 connecting block also allows little flexibility in the selection and arrangement of the cylinder. In addition, the fairly branched arrangement of the mostly metallic components is likely to involve additional effort in the appropriate mechanical support of the individual components and, overall, have an unfavorable acoustic radiation behavior.

Disclosure of the invention

Deviating from this state of the art or in addition, the present invention specifies a flexible hydraulic control arrangement which also has a compact construction and has favorable acoustic properties.

An embodiment of 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 mounting holes 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 for driving the hydraulic machine.

The special feature of the invention is, inter alia, that the hydraulic machine is arranged in an installation space in the control block, and that an intake fluid path, via which the hydraulic machine can draw in fluid from the fluid container during operation, through the first side face 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 compactly and also has excellent acoustic behavior. With regard to the cylinders to be used, the full flexibility is retained since the cylinders can be connected to the usual connections of the control block by means of a hose connection. However, only hose lines or pipelines to the cylinder used are necessary. The operating noise of the hydraulic machine is damped by the arrangement of the hydraulic machine in the control block. The heavy control block also dampens structure-borne noise from the hydraulic machine, since it can only be acoustically excited 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 emitted from the fluid container. If the fluid container has walls made of a comparatively flexible material, this dampens additional acoustic vibrations of the control block. Therefore, according to the invention, the entire arrangement of 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, these can also be easily mounted on a common base plate, resulting in a compact, integrated hydraulic drive module for a press or a press brake, for example. Since all fluidic control functions for a press, for example, can be represented by valves in the control block and / or by the hydraulic machine used in the control block, no further manual work is necessary in addition to the connections of the cylinder with hoses already mentioned, in order to fundamentally control the hydraulic control arrangement to make it operational. In addition, significantly less assembly material and pipe material is required than with a conventional structure. The logistics for such a compact arrangement are 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 view, 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 a press brake.

The hydraulic control arrangement according to the present invention can be used, for example, in press brakes, in press brakes, in hydraulic presses of all kinds, in pipe forming presses, and in general in cylinder drives, for example in lifting tables. There is generally 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.

Advantageous developments of the invention are the subject of the dependent claims.

If the intake fluid path has a first transverse bore, which opens into the first side surface of the control block opposite the fluid container and is arranged essentially transversely to an axis of the hydraulic machine, a particularly favorable arrangement of the control block, electric motor and the fluid container can be achieved. The arrangement can correspond approximately 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 opposite quadrants. The first cross hole does not have to be round, but can also be designed as a flat channel or an oval channel with the aid of modern manufacturing methods such as a casting process with printed cores. This saves volume in the control block and reduces flow resistance. The first transverse bore can be arranged in a lower part of the control block and thereby enables the construction of a control block with a 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 a plurality of suction valves in the control block. The first transverse bore can even penetrate the entire control block and emerge again in a second, opposite side surface, where it may be closed with a screw plug. Adjacent to the second side surface, e.g. a second fluid container can be arranged and also connected to the intake fluid path. The locking screw is omitted in the latter arrangement.

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 passed through opposite openings of the first side surface and the container wall, and a fluid passage is thus formed. The sealant is arranged in the region of these openings and itself now 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. There is no need for a flange or piping between the control block and the fluid container. 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. If the adhesive is applied sufficiently, 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, where there is a gap between the control block and the tank wall is acoustic decoupling between control block and container wall improved.

If - in the second-mentioned case - the aforementioned gap is provided, the sealant is preferably a flat gasket.

A particularly efficient and simple fastening of the container wall to the control block and a sealing of the fluid passage of the intake fluid path is achieved if a flange or a pressure plate is fastened to the container wall in the region of this passage in the interior of the fluid container. Appropriately, fasteners such as screws are used to clamp the container wall between the flange or the pressure plate and the first side surface of the control block, possibly with a flat gasket inserted between them.

If the fluid container and in particular the container wall are made of a plastic, low costs can be represented on the one hand, and on the other hand the acoustic properties of the arrangement of control block and fluid container are further improved. The plastic material of the fluid container, which is flexible in its surface, dampens vibrations particularly well. One can even say that the fluid container acts as an acoustic-mechanical low-pass filter, which 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 level in the fluid container can be read 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 that is oriented essentially perpendicular to the first side surface. The use of the area can be further improved if a third side area, which is opposite this mounting area, is aligned flush with the fluid container.

Another 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 intake fluid path described above can also be applied to the return fluid path. For example, it can be designed as a second transverse bore, optionally emerge on the second side surface, be arranged next to, above and / or 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 feedthrough is used for the intake fluid path and which variant is used for the return fluid path. Both variants of the fluid duct can be used for the intake fluid path and the return fluid path.

A connection point for the return filter is advantageously formed on the control block, which allows a filter replacement cartridge to be screwed on. Such a filter replacement cartridge is also easily replaceable for the end user. In addition, it is 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 intake 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 from 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 efficiently manufactured from mounting rails.

As said, the control block can be manufactured by a casting process, for example by iron casting. A sand core that is produced using a 3-D printing process is preferably used. Then channels such as the first transverse bore or the second transverse bore can be made in a particularly simple manner 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 resistances in the transverse channels can be achieved.

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

• 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,
• 2nd shows a tank-side external view of the hydraulic control arrangement according to the invention,
• 3rd shows a control block-side external view of the hydraulic control arrangement according to the invention,
• 4th shows a section in the area of the passages of the intake fluid path and the return fluid path between the control block and the fluid container,
• 5 shows a section in the region of the return filter and the transverse bore of the return fluid path, and
• 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 1 has a hydraulic drive arrangement for a press brake a hydraulic cylinder 2nd with a filling valve 80 - also called suction valve - and a hydraulic control arrangement 1 to control the cylinder 2nd and the filling valve 80 with hydraulic fluid, usually mineral oil.

The hydraulic control arrangement 1 has a control block 3rd and a fluid container 5 , optional a second fluid container 5 ' . It is connected to its consumer connections by means of lines, ie hoses or pipes 20th and 22 as well as at a control connection 24th with the cylinder 2nd and the filling valve 80 connected. In addition, a work management extends 26 from the filling valve 80 directly to the fluid container 5 to ensure a suction function.

The control block 3rd has mounting areas on which, for example, safety valves 4th are grown that have a fluid path from a hydraulic machine 10th to the consumer connections 20th and 22 can lock or unlock. These valves 4th are equipped with a switch position monitor. Also in the control block 3rd numerous built-in valves such as check valves 32 present, which is a suction of fluid from the fluid container 5 to a connection of the hydraulic machine 10th allow. The check valves 32 are with a suction line cross hole 18th in the control block 3rd connected. The suction line cross hole 18th is part of the intake fluid path that ultimately ends up in the fluid container 5 respectively. 5 ' is led.

The control block 3rd also has an installation space 28 for a hydraulic machine arranged therein 10th . This installation space is by means of a cover or a baffle plate 30th completed. With the help of the deflection plate 30th are the connections of the hydraulic machine 10th led into the block. There is also an installation space 36 for a clutch 44 provided through which a drive shaft 42 the hydromachine 10th with an output shaft 46 of the electric motor 9 connected is. The electric motor 9 is directly on the control block 3rd screwed on and limits the installation space 36 . Via a drive controller 7 the speed and torque of the electric motor 9 set according to a preset signal.

The control block 3rd is also with a return filter 12th provided, via the fluid by means of a line 14 and a tank pipe cross hole 16 in the fluid container 5 and possibly 5 'is returned. The return filter 12th becomes fluid from a return line 34 in the control block 3rd supplied, for example, fluid coming from the connector 20th via a decompression valve 4 ' is dissipated.

After the safety valves 4th are switched into their actuating position, can be by transferring hydraulic fluid between a lower annular chamber of the cylinder 2nd and its upper cylinder chamber using the hydraulic machine 10th the cylinder 2nd move up and down. Possibly. Missing fluid is fed through the check valves 32 from the container 5 respectively. 5 ' sucked up. Excess fluid can flow through the fill valve 80 be fed out if it is by means of an application of control pressure to the connection 24th is unlocked.

To build up a pressure in the upper chamber of the cylinder 2nd becomes fluid from the hydraulic machine 10th from the container 5 respectively. 5 ' sucked in and over the connection 20th the top cylinder chamber of the cylinder 2nd fed and compressed accordingly until the required pressure is reached.

To decompress the top cylinder chamber of the cylinder 2nd is connected 20th relief with the help of the decompression valve 4 ' carried out. For a subsequent retraction of the cylinder 2nd becomes fluid through the hydraulic machine 10th via connection 22 fed to the annular chamber. Up to a certain speed, fluid can flow through the valve 4 ' be discharged from the upper cylinder chamber. For higher speeds, the filling valve 80 unlocked.

When extending the cylinder 2nd The hydraulic machine steers at rapid speed under its own weight 10th the speed of the cylinder 2nd by the amount of connection from the annulus 22 removed fluid. The withdrawn fluid will the upper cylinder chamber via connection 20th fed. A difference is made via the filling valve 80 and the line 26 from the fluid container 5 sucked up.

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

The view in 2nd shows a perspective view in which the fluid container 5 is partially cut open. On a support frame that consists of mounting rails 40 screwed together are the control block 3rd and the fluid container 5 arranged, with a front side surface in this illustration 67 the control block flush with the fluid reservoir 5 is aligned. They can be seen on an upper mounting surface of the control block 3rd attached safety valves 4th as well as the return filter 12th , designed as a replaceable filter cartridge, for example according to data sheet RD 51478 the applicant. On the front side 67 are the work connection 20th for the cylinder chamber of a hydraulic cylinder 2nd , the work connection 22 for the ring chamber and the control connection 24th trained for a filling valve. In addition, the baffle 30th assembles and closes the inside of the control block 3rd trained installation space 28 for the hydraulic machine 10th . The check valves are also in the holes 32 used.

The fluid container 5 is adjacent to the control block 5 arranged. Through its side wall 52 are the intake fluid path with an intake port 62 performed, the in the aforementioned suction line cross hole 18th in the control block 3rd flows. The intake manifold 62 surrounds a pressure plate 60 on the inside of the container wall 52 . There is also a return from the control block 3rd through the side wall 52 guided, carried out on the container side by a flange 56 and an outlet port 58 . These are in fluidic relation with the previously mentioned tank line cross hole 16 in the control block 3rd in connection. Both the flange 56 as well as the pressure plate 60 are with screws 57 penetrating the side wall 52 on the control block 3rd attached. The way the hydraulic fluid paths pass through the side wall 52 and the attachment to the control block will be explained in more detail later using a sectional diagram. Next is on the top of the fluid container 5 a flange 79 provided with the help of a work management 26 - the suction line of the filling valve 80 - on the fluid container 5 connected. Inside the fluid container 5 is on the flange 79 a neck 78 set that protrudes into the fluid.

The fluid container is made of a mineral oil resistant plastic, this can be done more 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 an oil level indicator would not be necessary, since the oil level is visible through the material. However, an oil level indicator can also be installed. A fill opening 6 is expediently large enough that through it an assembly of the flange 56 or the pressure plate 60 with the screws 57 , as well as the nozzle 58 , 62 and 78 is possible. A diameter of 15 cm or more is suggested.

The 3rd shows a further perspective view of the hydraulic control arrangement 1 that compared to 2nd is rotated about 180 ° around the vertical. The electric motor can also be seen 9 that on the rear mounting surface 76 of the control block 3rd attached to it, for example with screws 57 . The electric motor covers it 9 the one inside the control block 3rd trained installation space 36 the clutch 44 from. In the side surface 66 open the suction line cross hole 18th and the tank pipe cross hole 16 and are there with screw plugs 48 closed, at least in the event that only the fluid container 5 and no further fluid container 5 ' is available. If you have an additional fluid container 5 ' provides, this would be on the side surface 66 of the control block 3rd arranged and could directly through its wall with the suction pipe cross hole 18th and the tank pipe cross hole 16 get connected. There is also a ventilation opening 38 to see the ventilation of the installation space 36 the clutch 44 serves.

Overall, it can be seen that the hydraulic control arrangement with its support frame, ie the mounting rails 40 , the control block 3rd , the electric motor attached to it 9 and the fluid container 5 occupies an approximately rectangular base area. The fluid container takes off 5 in about two adjacent quadrants of this rectangular base, the control block 3rd and the electric motor 9 take one of the remaining, the fluid container 5 opposite quadrants. A particularly space-saving and compact arrangement was achieved.

In the partial cut in 4th the area is shown in which the fluid container 5 with its container wall 52 and the control block 3rd with one of the fluid containers 5 facing side surface 64 are arranged adjacent to each other, at the point at which the suction line transverse bore 18th and the tank pipe cross hole 16 in the side surface 64 flow out.

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 cross hole 18th is threaded. In there is the intake manifold 62 screwed in through an opening 51 ' in the container wall 52 is led. Between the side surface 64 of the control block 3rd and the container wall 52 is the flat gasket 50 ' arranged which also the intake manifold 62 or the aforementioned opening 51 ' surrounds. This flat gasket 50 ' seals on the outside of the fluid container 5 the opening 51 ' in the container wall 52 towards the environment and thus allows a tight supply of fluid from the fluid container 5 through the opening 51 ' in the suction line cross hole 18th . The container wall 52 and the flat gasket 50 ' are made using a pressure plate 60 , another flat gasket 54 ' and screws 57 to the side surface 64 of the control block 3rd pressed so that the flat gasket 50 ' lies flat and has a certain compression. Here are the screws 57 through holes in the flat seals 50 , '54' and the container wall 52 guided and in threaded holes (covered, not shown) on the control block 3rd attached. The flat gasket 54 ' essentially serves to protect the container wall 52 by pressing the pressure plate 60 evenly on the plastic material of the container wall 52 distributed.

A variant of this fluid feedthrough is in connection with the tank line cross hole 16 shown. At their mouth in the side surface 64 the outer flat seal closes 50 and the opening 51 in the container wall 52 at. On the inside of the fluid container 52 is a flange 56 with a flat gasket 54 assembled - as before with screws 57 - in the threaded holes in the control block ( 3rd ) are attached. In the flange 56 is an outlet nozzle 58 used. The flange 56 with the screws 57 presses the seal 54 , the container wall 52 and the seal 50 to the side surface 64 of the control block 3rd at. 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 in the fluid container 5 .

It is irrelevant which variant of the fluid feedthrough is used for the intake fluid path and which variant is used for the return fluid path. Both variants of the fluid duct can be used for the intake fluid path and the return fluid path.

Instead of the inserted flat gasket 50 or 50 ' you could also put a sealing material on the outside of the container wall 52 Apply and then the container wall 52 in the area of the openings 51 , 51 ' by screws on the control block 3rd fasten. In addition or alternatively, it is conceivable for the container 5 on its container wall 52 with the help of an adhesive on the side surface 64 of the control block 3rd to fix.

If on the side surface 66 which of the side surface 64 opposite, also a fluid container 5 ' is arranged, then the fluid feedthrough from the in the side surface 66 also opening cross holes 16 and 18th in the fluid container 5 ' be carried out in the same way as just described.

In 5 is a section through the control block 3rd and the fluid container 52 shown in which the return fluid path is shown in more detail. The tank line cross hole 16 is in the side surface 66 with a screw plug 48 tightly closed and on the opposite side 64 with the help of the flat gasket 50 and the opening 51 in the container wall 52 connected to the inside of the fluid container. A tap hole in the control block 3rd forms a line 14 from that to a junction 82 of the return filter 12th , here is a filter replacement cartridge. From a line section 34 is at this junction 82 fluid intended for the return line to the return filter 12th fed. The junction 82 consists essentially of a threaded sleeve 84 that over the surface of the control block 3rd and a drain connection of the filter replacement cartridge 12th forms, and from an annular groove 86 which is an inlet connection of the filter replacement cartridge 12th represents. In this control block 3rd all return channels in the line section 34 collected and the filter 12th fed. However, variants are conceivable according to which return channels in the tank line transverse bore 16 flow out.

Finally, the shows 6 a stepped cut through the control block 3rd and the fluid container 52 in the area of the suction line cross hole 18th and the installation space 28 the hydraulic machine 10th or their engine 10 ' . The installation space 28 the hydraulic machine 10th and the installation space 36 the clutch 44 are in succession in the control block along an imaginary axis 3rd arranged. They form a step at their transition - because of the installation space 36 has a smaller diameter than the installation space 28 - and they are through a support ring arranged in front of the step 72 separated from each other. In the support ring 72 are rolling bearings 74 arranged on which the engine 10 ' the hydraulic machine 10th rotatably supported. The installation space 28 is on the front side surface 67 of the control block 3rd through the baffle 30th completed. The baffle 30th in turn takes rolling bearings 74 for the engine 10 ' and also has channels from the engine 10 ' in the control block 3rd to lead. There are these channels and thus the connections of the hydraulic machine 10th via the check valves 32 with the suction line cross hole 18th connected.

The check valves 32 are cartridge valves. They are slightly below and to the side of the installation space 28 axially parallel with the engine 10 ' arranged horizontally and on the inlet side as mentioned, with the suction line cross hole 18th connected. The suction line cross hole 18th enforces the control block 3rd below the installation space 36 for example in the area of the transition to the installation space 28 . It is on the side surface 66 with the clasp 48 tightly closed. On the side surface 64 is the suction pipe cross hole 18th at their mouth using the flat gasket 50 ' and the opening 51 ' in the container wall 52 as well as with the intake manifold 62 with the fluid inside the fluid container 5 connected.

The installation space 36 the clutch 44 is, as I said, on the one hand from the support ring 72 limited. From a central opening of the support ring 72 the drive shaft stands 42 of the engine 10 ' the hydraulic machine 10th in the installation space 36 in front. With the help of the clutch 44 is the drive shaft 42 with an output shaft 46 of the electric motor 9 connected. The one on the acreage 76 mounted electric motor 9 closes the installation space at the same time 36 on the outside of the control block 3rd from.

The arrangement of the hydraulic machine 10th with their engine 10 ' in the control block 3rd in the essentially closed installation space 28 counteracts the emission of airborne sound effectively. The control block also dampens 3rd with its high mass, the structure-borne noise of the engine 10 ' . Compared to a freely mounted hydraulic machine, the mechanically coupled arrangement of the engine 10 ' and control block 3rd significantly lower natural frequencies and thus a more pleasant acoustic emission spectrum. An additional damping of structure-borne noise takes place with the control block 3rd connected fluid container 5 , at least on the side surface 64 and over the mounting rails 40 to the control block 3rd - not only mechanically but also acoustically - is coupled and which also has container walls made of flexible plastic material. The container walls of the fluid container therefore emit considerably less sound than, for example, a metal container would.

The arrangement of the engine 10 ' with the suction valves arranged laterally below and axially parallel 32 and the suction line cross hole made transversely below 18th also has a high efficiency when using the construction volume of the control block 3rd . This allows the control block 3rd be kept fairly compact, despite being next to the hydraulic valves 4th , 4 ' , 32 etc. also the hydraulic machine 10th with the engine 10 ' and even the clutch 44 records.

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 cross hole 16 and the suction line cross hole 18th etc. are formed as sand core and remain free of casting material when pouring. Due to the successive arrangement of the installation spaces 28 and 36 with accessibility from the side surfaces 67 and 76 Here the sand core can be removed very well after casting. This also applies to the two cross holes 16 and 18th to. If you use a 3D printing process for the sand core, you can also create channel geometries with a non-round cross-section, for example for cross holes 16 and 18th represent very simple. These can therefore be optimized in terms of flow resistance and space requirements.

Reference list

1

Hydraulic control arrangement

2nd

Hydraulic cylinder

3rd

Control block

4th

Valves

5

Fluid container

5 '

Fluid container

6

Filling opening

7

Drive controller

9

Electric motor, variable speed

10th

Hydraulic machine

10 '

Engine hydraulic machine

12th

Return filter, filter replacement cartridge

14

management

16

Tank pipe cross hole

18th

Suction line cross hole

20th

Working connection cylinder space

22

Work connection annulus

24th

Control connection

26

Working line after suction function

28

Installation space for hydraulic machine

30th

Baffle plate / cover

32

Suction valves

34

Return line section

36

Installation space clutch

38

Ventilation clutch

40

Mounting rails

42

drive shaft

44

clutch

46

Electric motor output shaft

48

Screw

50, 50 '

Flat gasket

51, 51 '

Opening in the container wall

52

Container wall

54, 54 '

Flat gasket

56

flange

57

Mounting screws

58

Outlet connector

60

Pressure plate

62

Intake manifold

64

Control block side face

66

second side face control block

67

Third side face control block

72

Support ring

74

camp

76

Electric motor mounting area

78

Connection suction line

79

flange

80

Filling valves or suction valve

82

Connection point for filter replacement cartridge

84

Threaded sleeve

86

Ring groove

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102016119823 A1 [0002]
• WO 2018/029019 A1 [0004]

Claims (21)

Hydraulic control arrangement, in particular for a press, in particular for a press brake, with a hydraulic control block (3), which channels (14, 16, 18, 34), hydraulic connections (20, 22, 24) and mounting surfaces for valves (4) and / or has installation bores for valves (32), with 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), with 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 with an electric motor (9) which is used for driving of the hydraulic machine (10), characterized in that the hydraulic machine (10) is arranged in an installation space (28) in the control block (3), and in that an intake fluid path (18, 62) via which the hydraulic machine (10) can suck fluid from the fluid container (5) during operation, through the first side surface (64) of the control block (3) and through which a container wall (52) is passed. Hydraulic control arrangement after Claim 1 , characterized in that the intake fluid path has a transverse bore (18) in the hydraulic control block (3) which opens into the first side surface (64), and the first transverse bore (18) substantially transverse to an axis of the hydraulic machine (10) is arranged. Hydraulic control arrangement after Claim 2 , characterized in that the first transverse bore (18) opens into a second side surface (66) of the control block (3), the second side surface (66) being arranged opposite the first side surface (64), and in particular the first transverse bore (18 ) is closed on the second side surface (66) with a screw plug (48). Hydraulic control arrangement after Claim 2 or 3rd , characterized in that at the mouth of the first transverse bore (18) in the first side surface (64) is attached an intake port 62 which projects through a first opening (51 ') in the container wall (52) into the tank. Hydraulic control arrangement according to one of the preceding claims, characterized in that the container wall (52) is either arranged directly against the first side surface (64) or in that there is a gap between the container wall (52) and the side surface (64) Sealing means (50, 50 ') is arranged, and that the suction fluid path (18, 62) is guided through opposite openings (51') in the first side surface (64) and the container wall (52), in particular one - said openings ( 51 ') in size and position corresponding - opening is provided in the sealant. Hydraulic control arrangement after Claim 5 , characterized in that the sealant is a first flat seal (50 '). Hydraulic control arrangement after Claim 5 or 6 , characterized in that in the interior of the fluid container (5) on the container wall (52) in the region of the passage of the intake fluid path (18, 62) a flange (56) or a pressure plate (60) is fastened by means of fastening means (57) the arrangement of which the container wall (52) between the flange (56) or the pressure plate (60) and the first side surface (64) is clamped. 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 made of a plastic, the plastic in particular being milky-transparent, the plastic in particular being a polyethylene or a polyvinyl chloride. Hydraulic control arrangement according to one of the preceding claims, characterized in that a mounting surface (76) for the electric motor (9) on the control block (3) is oriented substantially perpendicular to the first side surface (64), and in particular a third side surface (67) of the Control block (3) is arranged opposite the mounting surface (76) and is aligned flush with the fluid container (5). Hydraulic control arrangement according to one of the preceding claims, characterized in that a further working line (26) with a connection piece (78) is led directly into the fluid container (5) and does not pass through the control block (3), the connection piece (78) in particular a flange (79) and a flat gasket is attached to the fluid container (5), or in particular the connector (79) and the flange (79) are made in one piece together with the fluid container (5) as a plastic part. Hydraulic control arrangement according to one of the preceding claims, characterized in that a return fluid path (16, 56, 58) also through the first side surface (64) of the control block (3) and through a second opening (51) in said one container wall (52) is passed through. Hydraulic control arrangement after Claim 11 , characterized in that the return fluid path has a second transverse bore (16) which opens into the first side surface (64), and wherein the second transverse bore (16) is arranged substantially transversely to an axis of the hydraulic machine (10). Hydraulic control arrangement after Claim 12 , characterized in that the second transverse bore (16) opens into the second side surface (66) of the control block (3), and in particular the second transverse bore (16) on the second side surface (66) is closed with a screw plug (48). Hydraulic control arrangement according to one of the Claims 12 or 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 are arranged opposite, wherein between said mouth and the second opening (51) and thus between the a second flat seal (50) is arranged on the first side surface (64) and the container wall (52). Hydraulic control arrangement according to one of the Claims 12 to 14 , characterized in that a return filter (12) is mounted on the control block (3) and that an outlet connection of the return filter (12) is connected to the second transverse bore (16). Hydraulic control arrangement after Claim 15 , characterized in that a connection point (82) is formed on the control block, which allows a filter replacement cartridge to be screwed on, in particular the interface (82) a central threaded sleeve (84) protruding from the control block (3) and one around the threaded sleeve arranged annular groove (86). Hydraulic control arrangement according to one of the preceding claims in conjunction with at least Claim 3 or at least Claim 13 , characterized in that a further fluid container (5 ') is arranged on the second side surface (66), the suction fluid path (18) and / or the return fluid path (16) from a respective mouth in the second side surface (66) in the further Fluid containers (5 ') are guided. Hydraulic control arrangement according to one of the preceding claims, characterized in that there is a support structure on which at least the control block (3) and the fluid container (5) are arranged together, the support structure being formed in particular from mounting rails (40). Hydraulic control arrangement according to one of the preceding claims, characterized in that the control block (3) is produced by a casting process, and 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 was produced by a printing process, the transverse bores (16, 18) in particular having a cross-sectional shape that deviates from a circular shape. Hydraulic drive arrangement with a cylinder (2) for moving a movable machine element and with a hydraulic control arrangement (1) according to one of the preceding claims, which is connected to the cylinder (2) by hydraulic lines. Machine with a hydraulic drive arrangement after Claim 20 for moving a movably arranged machine element, in particular the machine being a press brake and the movable machine element being a stamp.

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