EP1050685A2 - Hydraulic linear slider - Google Patents

Abstract

A cylinder and working chamber are formed in the slide (10), and the piston (24) is fixed in relation to the housing (11). T slide has a prismatic form. The sliding guide (12) in the housing is manufactured by a casting process. The piston divides the cylinder into two separate working chambers (13,29), the volume increase of which leads to opposed movement of the slide. Hydrau fluid lines are led to the working chambers through the piston and piston rod connected to it.

Description

The invention relates to a linear slide valve with a slide, which in a housing with a sliding guide is slidably mounted, and with a hydraulic drive which causes the slide to move and which one in a cylinder to form a hydraulic Has work space movable piston.

Linear spools of the type mentioned are used as actuators in various facilities for the processing and processing of metallic Materials and plastic or plastic composite materials used. The tasks of these assemblies typically include that Pressing, archetyping, embossing, bending, flanging, punching, cutting, Joining, joining presses and the execution of delivery functions with Special requirements. In the properties of the linear spool special requirements, especially a very high one Energy density, a very high level of management accuracy as well as a very high rigidity against lateral forces and against torsion. Farther they should have the most compact possible construction and as standardized basic assembly a flexible, universal application allow. There are also properties such as no maintenance over the entire service life, a robust design for use in environment contaminated with dirt, the possibility of any installation position, absolute tightness (e.g. for overhead installation) and last but not least an inexpensive one Manufacturing desirable.

Linear slide valves are known in various configurations. Because of the high energy density required, it is preferred around hydraulic devices. Basically, however, that is Conception possible as a pneumatically operated device.

Combinations of commercially available modules are particularly compact Linear cylinders known with rigid linear guide units by "saddling up" or by forming a constructional Longitudinal combination are formed.

DE-GM 71 04 168 is a hydraulically or pneumatically acting Slider for moving or swiveling blades, flaps or Containers known, in which the hydraulic working spaces in the stamp of the device are designed. Around the piston rod of the in rough operation used device against dirt, stone chips and the like protect, it is surrounded by a protective sleeve. The slider becomes alone guided by the piston rod and therefore has no torsional rigidity. It is therefore only suitable for absorbing linear forces.

Hydraulic block cylinders are also known, the housing of which is additional Have holes for guide rods that are parallel to the actual one Hydraulic cylinders are arranged. The piston rod head and one to usually a maximum of four guide rods are rigid in one Head plate screwed together. This arrangement ensures Flexural rigidity and security against rotation.

Furthermore, from DE 295 17 615 U1 a linear slide valve is known with a slide that can be moved in a housing with a roller guide and is secured against rotation, and with a hydraulic drive, which causes the sliding movement of the slide and which one in a cylinder to form a hydraulic work space has displaceably mounted pistons. Due to the however, only selective support of the slide on the rollers are Security against rotation and the ability to absorb transverse forces are limited.

Furthermore, the linear slide valve has a relatively large axial Overall length.

For the particularly high requirements in the area of cutting tools Another embodiment of a linear displacement valve is known (manufacturer: Heidel GmbH and Co. KG, Viersen, Germany). This is marked through a prismatic slider with usually rectangular Cross-section. The valve core comes with a cast housing completely free of play thanks to a special high-load sliding guide technology and maintenance-free (for life). The slider has a pocket into which a special hydraulic cylinder is inserted to the side of the movement axis becomes. This hydraulic cylinder has a piston with two through Piston rods or with a piston rod and a driving groove that act on the end faces of the pocket in the slider and so the pressure forces for a forward and backward movement on the slide transfer. The hydraulic special cylinder has one long side via a mounting flange, with the help of which it is screwed to the valve body becomes. For this purpose, the valve housing has an opening on it upper long side. The hydraulic oil connections are also located on this mounting flange. It is both a side and an after top-facing connection with appropriate piping routing possible to meet different, cramped installation conditions become. The linear slide valve described is characterized by its High-load capability and the precise sliding guidance of the prismatic slide out. In some cases, however, it can be used the size and weight are limited. Furthermore, a repair of the Linear slide valve is relatively complex.

The invention has for its object in a linear slide valve a compact design with a reduced Achieve volume and reduced weight. At the same time the linear slide should be easier to repair and usable be more flexible. Last but not least, the manufacturing costs should also be reduced become.

This object is achieved by the features specified in claim 1.

Accordingly, the linear displacement slide contains a slide in a known manner, which can be moved in a housing with a sliding guide is, as well as a hydraulic drive, which is the displacement movement of the slide and which one in a cylinder with formation of a hydraulic work chamber with movable pistons having. According to the invention, this linear slide valve is characterized in that that the cylinder and the working space are formed in the slide are and the piston is fixed in relation to the housing.

Under a "cylinder" is not necessarily a cylinder in the mathematical sense, i.e. with circular cross section, to understand but each work space delimited by parallel walls, in which there is a piston, the cross section of which is the cross section of the working area corresponds, can move parallel to the walls. In addition to a mathematical The "cylinder" in the sense of the claims can be cylindrical in particular also a cross section in the form of a regular polygon exhibit.

In the linear slide valve according to the invention, the functions of Slider and the hydraulic drive combined in one assembly. This is possible because the hydraulic drive is integrated into the slide itself. This measure has numerous advantages. So the waiver allows on two separate assemblies (slide, hydraulic drive) one more compact, leaner design while saving construction volume. In addition, components are saved (e.g. housing with cylinder bore and mounting flange) and thus a high cost and weight saving achieved. The elimination of connection points in which e.g. the mechanical Pressure transmission from the hydraulic drive to the slide takes place, leads to a further reduction in production costs and to avoid potential sources of error.

Furthermore, the arrangement can be in the linear slide valve according to the invention slide and hydraulic drive with high symmetry, by placing the cylinder and the piston on the central axis / axis of movement the slide can be arranged. This creates a centric and symmetrical introduction of force, which prevents the occurrence of tilting moments avoids. This leads to less parasitic stress and increases the reliability and longevity of the assembly. For linear spool valves according to conventional construction would have a corresponding symmetrical Training to significantly larger designs with an unacceptable specific performance.

Advantageous embodiments of the invention are in the subclaims featured.

The slider is preferably as a prismatic according to claim 2 Slider executed. As a result, a high degree of precision is achieved and achieved high rigidity.

Furthermore, it is preferred according to claim 3 if the sliding guide, the is arranged between the slide and the housing by a Casting process is made. Such a casting process leads on the one hand to a high quality sliding guide and at the same time is very inexpensive.

In an advantageous development of the invention mentioned in claim 4 the piston divides the cylinder into two separate work spaces, with an increase in volume of the work rooms each to an opposite Movement of the slide leads. That way it is possible by the inflow of hydraulic fluid and a pressure introduction Both an active preliminary and a bring about active return movement of the slide. The fact that the Piston divides the existing cylinder space in two, at the same time becomes an optimal one Utilization of this space achieved.

In a possible implementation of this variant of the invention Piston arranged at the end of a piston rod, which is a smaller one Diameter than the piston and which on one side of the cylinder (i.e. the slide) is led outwards. Carrying out the piston rod is tightly sealed all around, so no hydraulic fluid can leak. In this arrangement, the piston divides the cylinder space in two working spaces, as on this side and beyond the piston rod can be called lying. An introduction to pressure in the respective working spaces affect different sides of the piston and therefore leads to corresponding opposing forces the slider.

In order to fulfill their function, the hydraulic work rooms must also a supply line for a hydraulic medium (e.g. oil). Preferably is according to claim 5 this lead in the piston and in the arranged piston rod connected to the piston. Such an arrangement takes advantage of the fact that the piston in the linear slide valve according to the invention is fixed on the one hand and part of the Forms boundary walls of the work space. Therefore, the supply line of the hydraulic fluid from an external connection through the Piston rod and the piston to the place of use (and back) become. Of course, this also applies if, as with one above described embodiment of the invention two work spaces within of the slide are formed.

In the latter case, in which two different work rooms are supplied with supply lines by the piston, these are supply lines preferably parallel or concentric in the piston arranged. While the parallel arrangement a simpler manufacture allows deep drilling with fewer components, the concentric Arrangement can be chosen especially when the linear slide valve should be very compact.

In a further development of the invention according to claim 7, the Slide a rear and / or a front end stop sensor. In this way it can be determined and monitored whether the slide is at one of the anchor points. This information is usually important for the overall processing process, so that the exact Detection of this state is advantageous for controlling the overall process can be exploited.

According to claim 8, the piston is detachably connected to the housing, wherein in particular a screw and / or bayonet connection as the type of connection comes into consideration. By detaching the piston from the housing maintenance and repair of the linear slide valve becomes possible. Here there is only one component to be solved in order to have access to the hydraulic room at the same time and get to the slider. The maintenance of the linear slide valve is this considerably simplifies, resulting in lower operating costs and a longer lifespan.

In a development of the invention according to claim 9, that the hydraulic cylinder is no longer directly from the inner wall of the stamp is formed, but from a separate cylinder can. This is arranged in a corresponding opening in the stamp. A Such an arrangement has the advantage that the hydraulic unit is complete is stored in the cylinder sleeve and therefore completely from the Back of the linear slide can be removed without the Slide itself would have to be removed. Mounted on the slider Tools such as need precisely aligned knives or the like therefore not be removed. So there is also a risk of injury the inner wall or the sliding guide are excluded by the tools. Furthermore, the hydraulic oil is encapsulated by the cylinder sleeve and therefore cannot contaminate the installation site. Eventually also avoided the expansion of the stamp because the hydraulic pressure was not acts more directly on the stamp, but on the cylinder sleeve. This is in view of the already narrow tolerances of the slide gap of considerable advantage.

Fig. 1

eine Aufsicht auf den Linearwegschieber während eines Arbeitshubes;

Fig. 2

ein Detail der Aufsicht auf den Linearwegschieber;

Fig. 3

eine Rückansicht eines Linearwegschiebers mit einem Fußflansch;

Fig. 4

eine Rückansicht eines Linearwegschiebers mit Durchgangsbefestigungsschrauben;

Fig. 5

eine Rückansicht eines Linearwegschiebers mit einer Steck-Dreh-Zylinderstangen-Verriegelung.

Fig. 6

eine alternative Ausgestaltung eines Linearschiebers mit einer Zylinderhülse, die in einem Sackloch des Stempels angeordnet ist.

Embodiments of the invention are explained below with reference to the drawings. Show it

Fig. 1

a top view of the linear slide valve during a working stroke;

Fig. 2

a detail of the supervision of the linear slide valve;

Fig. 3

a rear view of a linear slide valve with a foot flange;

Fig. 4

a rear view of a linear slide valve with passage fastening screws;

Fig. 5

a rear view of a linear slide valve with a push-turn cylinder rod lock.

Fig. 6

an alternative embodiment of a linear slide with a cylinder sleeve which is arranged in a blind hole of the stamp.

In Fig. 1 is a plan view of a linear slide valve according to the invention 100 shown, with the housing 11, the Slider 10, the piston and the piston rod partially broken are shown to make the inner structure recognizable. The linear slide valve 100 has a compact and essentially cuboid shape Design. It consists of a housing 11, which is at its lower end a foot flange with holes 17 for mounting screws and dowel pins for fastening the linear slide valve to a machine (see also Fig. 3). Furthermore, there is a groove on the underside of the housing 11 18 arranged to receive a feather key on the mounting surface.

In the housing 11 is movable in the direction of the longitudinal axis the housing (horizontal in Fig. 1) of the slide 10. The Slider is preferably carried out with a square core. The slide 10 has an externally accessible mounting surface 16, in which one or more threaded holes 15 for the mounting screws are let in. In this way, depending on the application, different Elements are connected to the slider 10. The slider 10 is slidably supported in the direction of its longitudinal axis and can move the length of its working stroke out of the housing 11 move out. Usual stroke distances are between 30 to 100 mm Special designs also up to 500 mm. The forces which the slide 10 must apply in the axial direction (longitudinal forces) are in the range from 10 kN (1 to) to 100 kN (10 to), in individual cases also up to 250 kN (25 tons). As a result of an eccentric stress on the slide at Work process, the lateral forces on the slide can even multiply the nominal pressure force. However, no noteworthy The slide may bend or twist. This Requirements are very high, especially for cutting tools those in the extended (work) position in the presence of the named Shear forces a rigidity must be guaranteed at which the lateral deflection is less than 0.02 mm.

Last but not least, to meet these high-load precision requirements a special sliding guide 12, which in the gap between the slide 10 and the housing 11 is arranged. This sliding guide is preferred produced by a casting process.

The inventive feature of the linear slide valve shown in Fig. 1 is that the hydraulic drive in the slide 10th is integrated. On the back of the slide 10, i.e. on the mounting surface 16 opposite surface is a blind hole. The Together with the blind hole, slide 10 forms the cylinder of a hydraulic drive, a piston 24 with a piston rod in the blind hole 31 is stored and together with the blind hole the hydraulic Workspace 13 bounded.

On the back of the linear slide valve 100 are the leads 14 for the hydraulic oil and an end stop sensor 19 are arranged. This Elements are explained in more detail with reference to FIG. 2.

Fig. 2 shows the construction of the integrated in the slide 10 enlarged Hydraulic drive. In the illustration, the housing 11 is covered and in the upper part of the figure a section along the central axis drawn. The slide 10 is essentially the section with the Blind hole shown. The piston is in the blind hole as described above 24 movably (along the horizontal longitudinal axis in Figure 2). The piston 24 has a circumferential on its outer circumference Groove 25, in which there is a piston seal and guide bands. Thus, between the piston 24 and the slide 10 dense hydraulic working space 13 is formed.

The piston 24 is fixed at the end of a piston rod 31. The Piston rod 31 is in turn firmly connected to the housing 11 and stands at the rear end over the rear wall of the housing 11, the so-called Piston rod lock 32, addition. To this protruding end the piston rod 31 are two oil connecting flanges 14 and locked with a tension nut 22. Furthermore, the piston rod 31 along its longitudinal axis a central bore 27. This Hole 27 is at the rear end (on the right in Figure 2) through the Locking nut 22 closed. Furthermore, at the rear, from the Housing 11 protruding end of the piston rod 31 two radial Bores 21 arranged, which under the oil connection flanges 14 to come and the introduction of hydraulic oil into the central hole 27 serve.

At the other end of the piston rod 31 to which the piston 24 is attached is (left in Figure 2), the central bore 27 with a smaller cross section continued through the piston and thereby forms the oil outlet 23 into the work space 13. It is also parallel to the central axis the piston rod 31 is arranged as a central oil line, a tube 28. This leads sealed at its front end in the oil outlet 23 in Piston 24 and is at its rear end (right in Fig. 2) with a Seal 33 sealed against the wall of the central bore 27. This creates a completely sealed supply line for Hydraulic oil, which begins at the rear of the two oil connection flanges 14 and through the rear oil supply hole 21 and the inside of the pipe 28 leads to the work space 13. By introducing hydraulic oil along this way, a pressure is generated in the hydraulic working space 13. The device reacts to this pressure by shifting the Slider 10 in the direction of extension (left in Fig. 2, see arrow in Fig. 1).

With the device described so far, an extension can thus be made cause the slide 10 hydraulically. A retraction of the slider 10, on the other hand, would have to be done either passively or by negative pressure be effected in the work space 13. In contrast, is for improvement the power development and controllability of the retraction of the Slider 10 in the embodiment, a second hydraulic work space 29 provided. This second work space 29 is between the rear of the piston 24, the exterior of the piston rod 31, the Inner wall of the blind hole in the slide 10 and the front of one Piston rod seal nut 30 (equipped with seal wiper and guide bands). This working space 29 thus has the Shape of an annular gap around the piston rod 31.

The piston rod sealing nut 30 is firmly connected to the slide 10 and at its rear end at the entrance of the blind hole arranged. It closes the blind hole except for a central one Breakthrough through which the piston rod 31 is guided. The sealing nut 30 is not flush with the end of the slider, but the latter has a protrusion 20 beyond the sealing nut. This ensures that the projection 20 a stop for forms the fully retracted slide. The sealing nut 30 sits around the piston rod 31 and is movable sealed off with seals. From the front of the two oil connection flanges 14 leads the front of the two radial bores 21 in an annular gap, which between the outer wall of the tube 28 and the inner wall of the blind hole 27 is formed. This ring gap leads at its front end through a radial bore 26 Piston rod 31 into the working space 29. This way thus hydraulic oil are supplied to the working space 29. Doing so an introduction of hydraulic oil an increase in pressure in the working space 29, which is via the sealing nut 30 as a retraction force on the slide 10 transmits. The slide 10 can thus be actively retracted.

The housing 11 is on the back by the piston rod latch 32 completed. This is firmly screwed to the housing 11.

Furthermore, it has a central breakthrough through which the Piston rod 31 is guided. The piston rod lock 32 thus separates the Inside of the linear slide valve from the outside. In the piston rod lock 32 are also two bores, preferably offset by 90 ° attached, wherein in one of the holes, the sensor 19 for the end stop of the slide 10 sits, and the second bore of the vent rear slide free space is used. The use of the holes either for the end position sensor or as a vent depending on the design specifications by the environment. The protruding end of the sensor 19 and the cable or plug connection are in the selected arrangement on a protected Place and are therefore safe from damage. If the If the hole remains free as a vent, it can be sealed with a sieve plug be closed. In addition, it can also be used with an adsorber element be provided to even slight amount of leak oil to catch up. In this way, complete freedom from contamination (for product parts) can be guaranteed by hydraulic leak oil.

In addition to the rear end position sensor 19 can for the detection of front end position additionally on the slide 10 a shift rod with adjustable Switch cams are attached through another hole is guided to the rear in the piston rod lock 32 and their Switch cam is queried by another initiator.

The two oil connections 14 are designed as freely rotatable flanges and can therefore be pivoted in any direction for assembly become. Both flanges are preferably identical. You can use additional Provide throttle screws to control the flow rate his.

The pressure oil supply to the work rooms 13 and 29 is preferably carried out in the manner shown through a central, continuous bore 27 in the piston rod 31, in which a central tube 28 is also provided Sealing is introduced to the main working space 13 on the piston crown to supply. With suitable, larger piston rod diameters can also use two separate deep holes instead of concentric ones Oil supply can be provided. By choosing more suitable Piston rod diameter can also have a special rapid traverse design be provided for the return stroke.

The slide housing 11 has no (lateral) openings or openings on, which increases its rigidity and the manufacturing effort is reduced. The additional stiffness reserves can also can be used to reduce the weight of the device. Farther the lack of breakthroughs facilitates the casting process the slide bearing layer 12 and their processing. The simplicity of the housing enables their manufacture as extruded or extruded profiles. The same blank tools can be used for different stroke lengths be used. Also the provision of special lengths is the next largest by simply shortening the housing and slide Version possible.

3 to 5 are variants of the linear slide valve in the rear view shown.

3 shows a version in which the housing 11 has a foot flange, which is provided with holes 17 for fastening screws and dowel pins is. Alternatively or in addition to that shown and at the Longitudinally arranged on the housing flange 11 can be the housing also with an end flange, preferably on the outlet side the slider is arranged.

Fig. 4 shows an alternative housing 11 without a foot flange, which in the Side walls through holes 34 for through-fastening screws having.

In Fig. 5 is an alternative way of screwing the piston rod bolt 35 shown. The housing 11 has on its back a square opening that extends inwards towards a cylinder expanded, the diameter of the cylinder between the side length and the diagonal of the square. The piston rod lock 35 has a square basic shape (with rounded corners), which straight through the square opening on the back of the case 11 fits. The piston rod lock 35 can therefore by the square Opening are inserted into the interior of the housing 11. As soon as it reaches the area of the cylindrical extension, it becomes 45 ° twisted so that its corners 36 in the manner of a bayonet catch behind the side centers of the rear protruding over the cylinder wall Place a square opening in the housing 11. In this position the piston rod lock 35 can therefore not out of the housing 11. By means of a locking screw 37 which through the wall of the Housing 11 leads to a corner of the piston rod bolt 35, it is in locked in this position. This arrangement has the advantage that Loosen a single screw 37 and twist the piston rod bolt 35 by 45 ° the device can be disassembled. The complete Movable unit can be released after releasing the piston rod lock 35 (or 32) can be removed "backwards". With the help of figure 5 described plug-turn connection can also be used as multiple teeth be executed.

6 shows an alternative embodiment of the linear displacement valve 100 shown in a partially broken top view similar to Figure 1. With elements identical in construction to the preceding embodiments are the same Reference numbers denote and need not be explained again become.

The decisive change in this design is that the hydraulic cylinders no longer directly from the inner wall of the blind hole of the stamp is formed, but by a separate one Cylinder sleeve 38. This is arranged in the blind hole and on the Stamp 10, for example, fastened by a screw connection. At hers The inlet opening is the cylinder sleeve 38 through a sealing nut 30 closed, so that the two hydraulic work spaces completely are formed in the cylinder sleeve 38.

Such an arrangement has the advantage that the hydraulic unit is completely stored in the cylinder sleeve 38 and therefore also completely from the back of the linear slide valve 100 can be removed without that the slide itself would have to be removed. Mounted on the slider Tools such as precisely aligned knives or the like therefore do not need to be removed. So there is also a risk of injury the sliding guide 12 excluded by the distance. Further the hydraulic oil is encapsulated in the cylinder sleeve 38 and can therefore Do not contaminate the installation site. Finally, the expansion of the Blind hole of the stamp 10 avoided because the hydraulic pressure is no longer acts directly on the stamp. This is given the already narrow Tolerances of the slide gap are of considerable advantage.

Furthermore, in the embodiment according to FIG. 6, the variant is realized in that the hydraulic oil via two parallel channels 39 and 40 in the piston rod 31 is led to the rear or front work space.

Reference numerals

10th

Slider

11

casing

12th

Sliding guide

13

working space

14

Oil connection flange

15

Tapped hole

16

Mounting surface

17th

drilling

18th

Groove

19th

End position sensor

20th

head Start

21

Radial bore

22

Clamping nut

23

Oil leakage

24th

piston

25th

Groove

26

Oil leakage

27

central hole

28

pipe

29

working space

30th

Sealing nut

31

Piston rod

32

Piston rod lock

33

Seals

34

Through hole

35

Piston rod lock

36

corner

37

Locking screw

38

Cylinder sleeve

39

Hydraulic duct to the work area 13

40

Hydraulic duct to the work area 29

100

Linear slide valve

Claims (9)

Linear slide valve (100) with a slide valve (10), which is mounted in a housing (11) with a sliding guide (12) so that it can be moved and secured against rotation, and with a hydraulic drive which effects the displacement movement of the slide (10) and which has a piston (24) which is mounted in a cylinder and can be moved to form a hydraulic working chamber (13),
characterized, that the cylinder and the working space (13) are arranged in the slide (10) and that the piston (24) is fixed relative to the housing (11). Linear displacement valve according to claim 1,
characterized, that it contains a prismatic slide (10). Linear slide valve according to one of claims 1 or 2,
characterized, that the sliding guide (12) has been produced in the casting process. Linear slide valve according to one of claims 1 to 3,
characterized, that the piston (24) divides the cylinder into two separate working spaces (13, 29), the increase in volume of which in each case leads to an opposite movement of the slide (10). Linear slide valve according to one of claims 1 to 4,
characterized, that supply lines for the hydraulic fluid to the work spaces (13, 29) through the piston (24) and a piston rod (31) connected to the piston. Linear slide valve according to claim 5,
characterized, that the feed lines for the two different working spaces (13, 29) in the piston rod (31) are arranged in parallel or concentrically. Linear slide valve according to one of claims 1 to 6,
characterized, that the slide has a rear and / or a front end stop sensor (19). Linear slide valve according to one of claims 1 to 7,
characterized, that the piston (24) is detachably connected to the housing (11), preferably via a screw connection or a bayonet connection. Linear slide according to one of claims 1 to 8,
characterized, that the cylinder is formed by a cylinder sleeve (38) which is arranged in an opening of the slide.

Images