EP1247995B1 - Hydraulic linear slider - Google Patents

Abstract

The slide unit (10) has a housing (12) with a slide (26) moving along a slide guide (20). The slide-integrated hydraulic drive (40) has a two-stage working piston, with each piston forming a part drive. The piston also has a longitudinally moveable guide element (48), engaging coaxially about a piston rod (42), which is stationary relative to the housing. The guide element defines two relatively sealed inner chambers (74).

Description

The invention relates to a linear slide valve according to the preamble of claim 1.

Linear slide valves of the generic type are known. These will especially as actuators in various facilities for the Verund Processing of metallic materials and plastic or Plastic composite materials used. To the tasks of such linear spool typically include pressing, archetyping, stamping, Bending, flanging, punching, cutting, joining, joining presses and the Execution of delivery functions with special requirements. The properties Such linear spool valves have special requirements provided, in particular a very high energy density, a very high guidance accuracy and a very high rigidity against lateral forces and belong against twisting. Furthermore, the linear spool should are as compact as possible and are standardized Basic assembly a flexible, universal application allow. Furthermore, properties are like 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 (for example when installing overhead) and 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, is on the Conception possible as a pneumatically operated device.

A linear slide valve according to the preamble of claim 1 is through US-A-4,137,828 discloses a triple acting welding piston for welding reinforcement steel inserts for the concrete of Startund Airfield runways revealed. This welding iron includes an outer cylinder, an inner cylinder, a shaft and radial extending piston means between the inner and outer cylinders can be actuated between several separate pressure chambers to form the inner and outer cylinders, and means for a pressure medium in or derive from the pressure chambers for axial movements of the inner cylinder relative to the outer cylinder, wherein the extension of the welding piston at particularly high pressure for Cylinder of a predetermined diameter is made to weld of large diameter reinforcing bars. The Welding iron is designed as a 3-stage slide and therefore has several pressure chambers. The piston rod used here has no sections with different diameters to make different to train large interiors.

A linear slide valve is known from EP 1 050 685 A2, in which the Achieve a compact design and reduced volume and thus reduced weight, a hydraulic drive integrated in the slide is.

The invention is based, a linear slide valve the task Generic type to create that while maintaining a compact Design can realize large actuation forces.

According to the invention, this object is achieved by a linear slide valve solved the features specified in claim 1.

Thereafter, the linear slide valve according to the invention is designed in such a way that the working piston of the hydraulic drive is designed in two stages is, with each stage of the working piston a partial hydraulic drive of the hydraulic drive forms, with the working piston one to the housing comprises longitudinally displaceably guided guide element, the coaxial one engages around the piston rod fixed to the housing and two to the piston rod axially spaced and mutually sealed interiors trains and that on the one hand by a stopper and on the other hand by a screw connection is closed pressure-tight and to form the Interiors has an intermediate piece, the piston rod coaxial is surrounded by a guide element and a first smaller diameter Section and a second larger diameter section has, wherein the intermediate piece is arranged on the section, the via a seal opposite the piston rod and via seals is arranged close to the guide element, so that a first Interior and a second interior is formed, the two Sections to the inner wall of a blind opening of the slide a circumferential Have play of 0.5 mm, for example, the guide element together with the stopper, the intermediate piece and the screw connection is mounted longitudinally displaceable to the piston rod.

The fact that a working piston of the hydraulic drive is designed in two stages is, with each stage of the working piston a partial hydraulic drive of the hydraulic drive is advantageously achieved that accordingly the selected multi-stage increase in the actuating force of the linear slide valve is achieved. The applied by the individual stages Operating forces overlap and thus lead to a larger one Total operating force.

Thus, such linear spool valves while maintaining a precise guidance and high transverse rigidity, large machining forces, for example with cutting tools.

In a preferred embodiment of the invention it is provided that the working piston a guide element which is longitudinally displaceable to the housing comprises, the coaxial a fixed to the housing piston rod engages, the guide element two axially spaced from the piston rod and forms mutually sealed interiors. By such an embodiment is advantageously achieved, which is available to use the standing frame size to form the partial hydraulic drives. In particular, this results in a parallel effectiveness of the Partial hydraulic drives, so that the increase in the actuating force of the linear slide valve is easily accessible.

In each of the mutually sealed interior spaces of the guide element two hydraulic seals are sealed against each other Workrooms designed, optionally with hydraulic oil under pressure are acted upon. This advantageously achieves that either the positioning movement of the linear slide valve or the return movement of the linear slide valve can be activated hydraulically.

Further preferred embodiments of the invention result from the other features mentioned in the subclaims.

The invention is described in an exemplary embodiment based on the associated drawing, in Fig. 1 a longitudinal section through a linear slide valve shows, explained in more detail.

Fig. 1 shows a longitudinal slide generally designated 10. The longitudinal slide valve 10 comprises a housing 12, which has an interior 14 forms the interior 14 is symmetrical to a longitudinal axis 16 educated. An inner wall 18 of the interior 14 is with a Slideway 20 provided, preferably by a casting process in is known to be produced.

When viewed in cross section, the housing 12 is, for example, cylindrical, in particular, however, cuboid. Correspondingly owns the interior 14 viewed in cross section a round or preferably a rectangular cross-sectional area. An outer surface 22 the housing 12 preferably forms a mounting surface and has one Groove 24 for receiving a feather key or the like, for positioning and absorbing the displacement forces.

Inside the housing 12, ie in the interior 14, there is a slide 26 arranged, which is guided on the slide 20 completely free of play. Viewed in cross section, the slide 26 has an interior 14 adapted contour, so it is preferably designed as a cuboid. The Slider 26 forms a prismatic slider. The slider 26 has a section 28 projecting longitudinally beyond the housing 12, which forms an actuating surface 30. The actuating surface 30 serves for example the inclusion of tools not shown in detail, for example cutting tools or the like, or as a printing or Press surface that is in contact with a machine to be machined Workpiece can be brought.

The forces exerted by the slide 26 in the axial direction and resulting Shear forces must be in the range of 10 KN to 150 KN, in Individual cases also up to 250 KN. As a result of an off-center load of the slider 26 during the operation, especially when on the Slider 26 arranged cutting tools can on the slider 26 acting transverse forces are a multiple of the nominal longitudinal force.

The housing 12 is on its, facing away from the section 28 of the slide 26 End closed by an end flange 32. The end flange 32 is interposed by an intermediate plate 34 connected to the housing 12 via connecting means 36. hereby the interior 14 becomes a bag opening, so that the slide 26 through the end flange 32 or the intermediate plate 34 a movement stop is formed.

The slide 26 in turn forms a pocket opening 38, which in the direction the intermediate plate 34 is open. The bag opening 38 is used for receiving a hydraulic drive designated 40 in total. The hydraulic drive 40 is thus integrated in the slide 26.

The blind opening 38 of the slide 26 forms the cylinder of the hydraulic drive, which holds a working piston. The working piston comprises a piston rod 42 which with an annular shoulder 44 in a through the end flange 32 and the intermediate plate 34 corresponding trained annular groove 46 engages. As a result, the piston rod 42 with the longitudinal axis 16 mounted in alignment. The piston rod 42 is thus fixed that is, not longitudinally displaceable, arranged.

The piston rod 42 is coaxially encompassed by a guide element 48, the first section 50 forming a cylinder tube 50 'and one forms second section 52. Sections 50 and 52 have Inner wall 54 of the pocket opening 38 of the slider 26 a revolving Play of about 0.5 mm. A play-free tour is also possible. Between the guide element 48 and the piston rod 42 occur Formation of an annular space 56.

The section 50 of the guide element 48 is at its, the section 28 of the slide 26 facing the end face by a stopper 58 sealed pressure-tight. The plug 58 is screwed into the cylinder tube 50 ', d. H. by means of an external thread 60 into an internal thread of the Cylinder tube 50 'screwed in. In addition, one is indicated here Seal 62 provided.

The sections 50 and 52 of the guide element 48 are non-positive, for example via a threaded connection 64.

The sections 50 and 52 are for this purpose at their mutually facing ends provided with corresponding corresponding recesses.

The piston rod 42 has a first section of smaller diameter 66 and a second larger diameter section 68. On the section 66, an intermediate piece 70 is arranged, which is connected via a seal 72 with respect to the piston rod 42 and via seals 84 with respect to the Guide element 48 is arranged tightly. This leads to training a first interior 74 and a second interior 76 of the annular space 56. The intermediate piece 70 thus forms a bulkhead between the interior spaces 74 and 76. The intermediate piece 70 engages by means of a ring shoulder 78 into a corresponding ring recess 80 between the sections 50 and 52 of the guide element 48. As a result, the guide element 48 and the intermediate piece 70 are of this type arranged that they are not movable relative to each other.

The piston rod 42 carries a first piston fixedly arranged on it 82, which is arranged opposite the plug 58. The piston 82 is via seals 84 on section 50 of the guide element 48 out so that it forms between piston 82 and plug 58 a hydraulic work space 86 comes.

The arrangement of the piston 82 and the intermediate piece 70 forms the interior 74 also has a hydraulic working space 75th

The piston rod 42 carries a second piston 88, which is also fixed the piston rod 42 is arranged. The piston 88 is over seals 90 guided on the section 52 of the guide member 48. Between the piston 88 and the intermediate piece 70 are thereby formed a hydraulic work space 92.

The piston rod 42 is also encompassed by a screw connection 94, which is arranged tightly on the piston rod 42 by means of seals 96. The screw connection 94 also forms an end closure for the guide element 48 and the slide 26. By arranging the screw 94, the interior 76 also simultaneously forms a hydraulic one Work space 77.

The piston rod 42 has a first axial bore 100 and a second Axial bore 102. On the one hand, the axial bore 100 opens into the hydraulic one Working space 86 and a radial bore 104 in the hydraulic Working space 92. The axial bore 102 opens out via a radial bore 106 in the hydraulic working space 74 and via a radial bore 108 in the hydraulic working space 76. The axial bores 100 and 102 are each with a hydraulic oil connection flange 110 or 112 connected. The connecting flanges 110 respectively 112 are connected to hydraulic oil sources, not shown.

The longitudinal slide valve 10 shown in FIG. 1 has the following function:

To extend the slide 26, the connecting flange 110 is below Hydraulic oil under pressure is applied. Through the pressure connection over the axial bore 100 builds up the pressure in the hydraulic work space 86 and via the radial bore 104 additionally in the hydraulic work area 92 on. This results in a - as shown in Fig. 1 - leftward compressive force on the plug 58 and the intermediate piece 70 exercised. A resulting actuation force is depending on the amount of pressure and the area under pressure. This results in the one facing the hydraulic working space 86 Area of the plug 58 as the pressurized area and the surface of the intermediate piece facing the hydraulic working space 92 70 as a pressurized surface. This pressurized Areas add up to a total pressurized area, so that a greater actuation force compared to the known longitudinal slide valves can be applied. Here the surface of the intermediate piece flows 70 not completely in the increase in strength, however must be around the cross section of section 66 of piston rod 42 be reduced.

The force that builds up is via the plug 58 and the guide element 48 transferred to the slider 26 so that it has a corresponding experienced axial adjustment movement along the longitudinal axis 16. The maximum stroke of the slide 26 is here by the axial distance of the Piston 82 to the intermediate piece 70 or the piston 88 specified for the screw 94.

A return movement of the slide 26 is possible in that the connecting flange 112 is pressurized hydraulic oil. This pressure builds up over the axial bore 102 and the radial bores 106 and 108 in hydraulic workrooms 75 and 77. Corresponding the pressurized facing the hydraulic working space 75 Area of the intermediate piece 70 and the hydraulic Working space 77 facing the pressurized surface of the screw connection 94 builds one - as shown in FIG. 1 - right-hand restoring force on the slide 26 in the housing 12 retracts. The screw connection 94 provides the ring shoulder at the same time 44 the piston rod 42 a reset stop.

It is clear that the hydraulic drive 40 by the arrangement of two pistons 82 and 88 on the piston rod 42 - with interposition an intermediate piece 70 - is formed in two stages, so that there is an increase in the area under pressure and thus the actuation force increases. The piston 82 forms in connection with the hydraulic work space 86 and the section 50 of the guide element 48 comprises a first partial hydraulic drive 40 ', while the piston 88 in connection with the intermediate piece 70 and the Guide element 48 forms a second partial hydraulic drive 40 ".

With regard to the further advantages of the longitudinal slide valve 10, in particular in terms of its compact design and the basic advantages a hydraulic drive 40 integrated into the housing 12 is opened referred to EP 1 050 685 A2.

The invention is of course not limited to that shown Embodiment. So are also multi-stage versions (more than two stages) conceivable. This either leads to a reduction the maximum stroke of the linear slide valve or to a larger axial extent of the linear slide valve.

LIST OF REFERENCE NUMBERS

10

Längswegschieber

12

casing

14

inner space

16

longitudinal axis

18

inner wall

20

slide

22

outer surface

24

groove

26

pusher

28

section

30

actuating surface

32

end flange

34

intermediate plate

36

connecting means

38

blind opening

40

hydraulic drive

40 '

first partial hydraulic drive

40 "

second partial hydraulic drive

42

piston rod

44

annular shoulder

46

ring groove

48

guide element

50

first section

52

second part

54

inner wall

56

annulus

58

Plug

60

external thread

62

poetry

64

threaded connection

66

first section

68

second part

70

connecting piece

72

poetry

74

first interior

75

hydraulic work space

76

second interior

77

hydraulic work space

78

annular shoulder

80

annular recess

82

piston

84

seals

86

hydraulic work space

88

piston

90

seals

92

hydraulic work space

94

screw

96

seals

100

first axial bore

102

second axial bore

104

radial bore

106

radial bore

108

radial bore

110

flange

112

flange

Claims (4)

1. A linear path slide (10) with a slide (26) which is arranged slidingly movable in a housing (12) along a sliding guide (20) and safe against torsion and with a hydraulic driving gear (40) integrated into the slide (26) for a shifting movement of the slide (26), whereby a working piston of the hydraulic driving gear (40) is configured with several stages and whereby each stage of the working piston forms a partial hydraulic driving gear (72, 102, 104) of the hydraulic driving gear (40),
   characterized in that the working piston of the hydraulic driving gear (40) is configured with two stages, whereby each stage of the working piston forms a partial hydraulic driving gear of the hydraulic driving gear (40), whereby the working piston comprises a guiding element (48) guided slidingly lengthwise to the housing (12), guiding element which coaxially encompasses a piston rod (42) fixed with respect to the housing (12) and constitutes two inner spaces (74, 76) axially spaced to the piston rod (42) and sealed against each other and which is closed pressure sealed on the one hand by a plug (58) and on the other hand by a screwed connection (94) and which shows a transition piece (70) for constituting the inner spaces (74, 76), whereby the piston rod (42) is coaxially encompassed by a guiding element (48) and has a first section with a smaller diameter (66) and a second section (68) with a bigger diameter, whereby the transition piece (70) is placed on the section (66), this transition piece being placed sealingly to the piston rod (42) over a gasket (72) and to the guiding element (48) over gaskets (84) so that a first inner space (74) and a second inner space (76) is constituted, whereby both sections (50, 52) have a circumferential backlash of, for example, 0,5 mm to the inner wall (54) of a blind opening (38) of the slide (26), whereby the guiding element (48) is positioned together with the plug (58), the transition piece (70) and the screwed connection (94) movable lengthwise with respect to the piston rod (42).
2. A linear path slide according to claim 1,
   characterized in that the piston rod (42) carries a first piston (82) placed in the inner space (74) and a second piston (88) placed in the inner space (76) which divide the inner spaces (74, 76) into hydraulic working spaces (86, 75 or 92, 77).
3. A linear path slide according to claim 2,
   characterized in that the piston rod (42) possesses a first axial bore hole (100) which is connected with a hydraulic oil connecting flange (110) and which runs into the hydraulic working spaces (86 and 92).
4. A linear path slide according to claim 3,
   characterized in that the piston rod (42) possesses a second axial bore hole (102) which is connected with a hydraulic oil connecting flange (112) and which runs into the hydraulic working spaces (75 and 77).

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