EP1597484B1 - Procede et dispositif permettant l'augmentation de pression dans des cylindres, en particulier des etancons hydrauliques - Google Patents

Procede et dispositif permettant l'augmentation de pression dans des cylindres, en particulier des etancons hydrauliques Download PDF

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Publication number
EP1597484B1
EP1597484B1 EP04708712A EP04708712A EP1597484B1 EP 1597484 B1 EP1597484 B1 EP 1597484B1 EP 04708712 A EP04708712 A EP 04708712A EP 04708712 A EP04708712 A EP 04708712A EP 1597484 B1 EP1597484 B1 EP 1597484B1
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EP
European Patent Office
Prior art keywords
piston
pressure
piston rod
cylinder
surface cavity
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Expired - Lifetime
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EP04708712A
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German (de)
English (en)
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EP1597484A1 (fr
Inventor
Wolfgang Voss
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B3/00—Intensifiers or fluid-pressure converters, e.g. pressure exchangers; Conveying pressure from one fluid system to another, without contact between the fluids
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
    • E21D23/16—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
    • F15B11/032—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of fluid-pressure converters
    • F15B11/0325—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of fluid-pressure converters the fluid-pressure converter increasing the working force after an approach stroke
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
    • F15B2211/214—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being hydrotransformers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7055—Linear output members having more than two chambers

Definitions

  • a pressure transmitter which is oil, water, water in oil emulsion, plasma or other liquids or even air.
  • Hydraulics is the teaching and technical application of flows in compressible fluids. This means that in the hydraulic fluid, but especially oil or water in oil emulsion initially affected accordingly in a high-pressure pump, ie biased to be then supplied via hose or similar lines to the cylinder. Valves are used to control the extension and retraction of the cylinders, always using one and the same pressure, namely the pressure dependent on the power of the high-pressure pump.
  • the invention is therefore an object of the invention to provide a method and an apparatus that allows the operation of cylinders with respect to the pump pressure arbitrarily increased internal pressure (working pressure), without the need for separate additional high-pressure pumps.
  • the object is procedurally achieved in that the pressure in the piston surface cavity by means of a displaceably arranged in the piston rod and serving as a compressor clamping piston with associated piston rod is further increased, being used for a compression of the pressure transducer in the piston surface cavity of the pressure transducer predetermined pressure level by the in the Piston rod displaceably arranged clamping piston inserted with its piston rod by means of the pressure transmitter predetermined pressure level in the piston surface cavity and the volume is thereby reduced.
  • This method thus makes it possible, independently of the starting point of the pressure level of the pressure transmitter, to increase these specifically within the piston surface cavity in order to achieve advantages in this way. If, for example, starting from a pressure level significantly below 400 bar, it is possible with the aid of the method according to the invention to increase the pressure level in the cylinder in a targeted manner, without the need for other lines, a differently dimensioned cylinder or a further pump. Rather, within the cylinder, the pressure is increased so that the desired maximum pressure altitude is reached. As a result, for example, in underground mining and tunneling the necessary setting pressure in the stamp, so the appropriately trained cylinder can be achieved without it being necessary to use the expensive and correspondingly special lines and valves requiring high-pressure pump.
  • a cylinder is provided, the compressor is connected to transmit a pressure transducer same pressure head on the head side of its clamping piston with the same, arranged in the supply line high-pressure pump, so that the piston surface cavity and that the pressure transducer located therein on the one hand directly via an input valve and additionally formed indirectly influenced via the compressor with the same high-pressure pump.
  • the piston surface cavity is formed as executed in the cylinder cover, piston and piston rod bores, wherein the bore in the piston rod has a socket receiving enlarged, in which the clamping piston is slidably disposed with a corresponding with the bore, small piston rod ,
  • the piston surface cavity is once directly connected to the high pressure pump and once indirectly, wherein it is provided that the piston surface cavity via the head side of the piston arranged input valve with the high-pressure pump is directly connected.
  • the input valve is thus in the foot of the punch or the cylinder, so that the piston with the piston rod is safely extended when the connection is made with the high-pressure pump, because then the piston is loaded correspondingly large area.
  • the tensioning piston which is arranged displaceably within the cylinder, is again visually and under the example of a stamp seen underground from above with pressurized fluid, ie with the pressure transducer.
  • the sleeve receiving the clamping piston is closed by a rod end which at the same time closes the large piston rod and to which the connection valve and tensioning piston are assigned connecting bores at the top end.
  • This rod end is partially in pushed the bush or the correspondingly large piston rod and fixed there, where it is held in this position alone by the fact that it is clamped or loaded from above.
  • the connection valve thus rises with the rod end, but always remains easily accessible, if only because it projects laterally beyond the rod end or the piston rod.
  • connection valve and the connection bores the pressure transmitter is guided on the tensioning piston on the head side, so that it is displaced accordingly, because this forces the given surfaces.
  • the clamping piston has corresponding dimensions, it is much larger than the piston rod.
  • the rod end which closes the bushing at the top and thus also the hollow large piston rod, moreover, ensures that the pressure conditions within the cylinder can be built up accordingly.
  • the clamping piston has a plate-shaped recess on the side opposite the piston rod. This plate-shaped recess ensures that the hydraulic fluid or the pressure transducer can have the same effect over as large a surface area of the piston. It is also prevented that the tensioning piston practically sticks to the rod end. Overall, a fast, reliable response of the corresponding translation system is thus ensured.
  • the clamping piston has a relative to the associated small piston rod significantly larger diameter.
  • the piston rod has a diameter of 68 mm and the clamping piston has a diameter of 110 mm.
  • the piston surface cavity has a diameter of 70 mm, which will be discussed further back.
  • an annular gap remains deliberately, with the invention providing that the small piston rod has an annular gap between her and the bore wall of the piston is designed to leave, which is connected to the underside of the passable by the small piston rod bush bottom.
  • the tensioning piston has a larger diameter than the small piston rod, with which an air-ring space is predetermined in the bush, in the air.
  • the air in it must be displaceable, which is achieved in that the sleeve in the area of the bush bottom has a cross-bore connecting the Lucasringraum between inner sleeve wall and outer wall of the small piston rod with a longitudinal bore to the outer atmosphere.
  • the large piston is pressurized from below with pressure transmitter or with the hydraulic fluid.
  • This is achieved in particular expedient in that between the inner wall of the cylinder housing and the outer wall of the large piston rod, an annular space is formed, which is closed at the bottom by the piston with sealing rings and above a locking ring with integrated sealing rings, which is connectable via a retraction valve with the same high-pressure pump.
  • the pressure transmitter penetrates directly into the annular space, wherein the sealing rings ensure that the annular space is sealed to the outside.
  • the pressure transducer affects only the underside of the large piston, so that it is pushed back into the starting position.
  • the locking ring has an external thread which is designed to correspond with an internal thread associated with the cylinder housing end.
  • the locking ring can thus be screwed in and is in a safe position, even if the cylinder is extended or retracted.
  • sealing ring associated with the sealing ring are arranged sealingly with respect to the large piston rod and with respect to the annular space.
  • the locking ring on the piston rod side two and one down, d. H. directed toward the annulus third sealing ring.
  • the invention is characterized in particular by the fact that a method and a device are provided with which the operation of cylinders is substantially simplified. Either you can work with pumps with lower power, in which case the necessary increase in pressure in the cylinder is made or you work with the same units, especially the highest pressure generating high pressure pumps and can then generate within the cylinder a significantly higher lying pressure, either more way or just more pressure inside the cylinder.
  • a method and a device are provided with which the operation of cylinders is substantially simplified. Either you can work with pumps with lower power, in which case the necessary increase in pressure in the cylinder is made or you work with the same units, especially the highest pressure generating high pressure pumps and can then generate within the cylinder a significantly higher lying pressure, either more way or just more pressure inside the cylinder.
  • FIG. 1 shows a cylinder 1 in longitudinal section, wherein it becomes clear that the main body 2 of this cylinder 1 consists of the cylinder housing 3 with the cylinder cover 4 and the piston 5 with piston rod 6.
  • the piston 5 with the piston rod 6 is slidably disposed within the cylinder housing 3, wherein the supply line 7 to initiate via the input valve 9 hydraulic fluid or pressure transducer in the piston surface cavity 8.
  • This pressure transmitter which penetrates into the piston surface cavity 8 ensures that the piston 5 with the piston rod 6 and the end rod end 19 moves out of the cylinder housing 3.
  • the interior, here denoted by compressor 10, is not in the way of this pushing or supports this.
  • the piston surface cavity 8 is in the illustrated example of the bore 11 in the cylinder cover 4, the bore 12 in the piston 5 and the bore 13 in the piston rod 6 is formed.
  • the piston surface cavity 8 thus has the shape of a cylinder.
  • the large piston rod 6 is hollow as already mentioned, wherein the bore 13 is pulled through to the upper end.
  • a sleeve 15 is arranged, which receives a clamping piston 16 with the small piston rod 17.
  • the tensioning piston 16 is arranged displaceably in the longitudinal direction, wherein it can be connected via a mounted on the rod end 19 connecting valve 18 and the connection bores 20, 21 with the supply line 7 'and the high pressure pump, not shown here.
  • the pressure transmitter is thus guided by the supply line 7 in the connection valve 18 and from there via the two connection bores 20, 21 on the clamping piston 16, which has a plate-shaped recess 22 in this area.
  • annular space 45 between the inner wall 43 of the cylinder housing 3 and the outer wall 44 of the large piston rod 6 is provided.
  • This annular space 45 extends to below the piston 5.
  • the annular space 45 is connected to the retraction valve 52, so that via the supply line 7 "if necessary pressure transducer can be brought into this annulus 45.
  • the annular space 45 is connected to the cylinder housing end 55 via a locking ring 48 which is equipped with a plurality of sealing rings 49, 50, 51 to seal against all sides. It has an external thread 54 which is formed corresponding to the internal thread 56 of the cylinder housing end 55, so that a screwing is possible.
  • Figure 2 shows a longwall structure 60, which is equipped with a number of cylinders to be mentioned later on.
  • a safety standard is driven with the help of water in oil hydraulics, which is excellent both in terms of the liquid used and the setting forces to be achieved.
  • the conveying means 61 Via the conveying means 61, the conveyed material conveyed in is removed, whereby this conveying means 61 extends in the direction of the background and vice versa and is connected to the base plate 63 of the longwall construction 60 via a push cylinder 62.
  • the conveyor 61 is always influenced so that it is close to the coal joint, not shown here.
  • the one or more punches 66 here a multi-part punch are supplied via a running through the long supply line with hydraulic fluid of about 360 - 400 bar. Via the connection valve 67, these punches 66 are directly and indirectly connected to the high pressure pump, as explained earlier. For this purpose, however, only one supply line is required, which can be designed simplified in particular when the cylinder, i. H. the punch 66 and the other cylinders as shown in Figure 1 are formed.
  • the hedge shield 64 is followed by the hanging end cap 68, which is supported by the punch 66.
  • this hanging end cap 68 forms the sliding part 69, which can also be inserted and pushed out via a cylinder, not shown here, in order to bring the tip 72 of the hanging wall cap 68 as far as possible up to the collision with the coal.
  • a longwall construction stretches between hanging wall 70 and horizontal 71 and ensures that the cavity remains open as long as it is needed for the extraction.
  • FIG. 3 shows in simplified form a hydraulic excavator 73 with its travel part 74 and the swivel arm 75.
  • the swivel arm 75 but also the bucket 77 and other components are associated with cylinders through which individual functions can be performed or facilitated.
  • the actuating cylinder 76 With the actuating cylinder 76, the lower part of the pivot arm 75 is pivoted up or otherwise brought into a different position, while the blade 77 in their movements on the Bucket cylinder 78 is controlled.
  • the use of the present invention is particularly interesting because there are a variety of cylinders are used, which also have different tasks. Therefore, it is not necessarily necessary to equip all cylinders with an inside compressor.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Actuator (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Reciprocating Pumps (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)

Claims (11)

  1. Procédé permettant l'augmentation de pression dans des cylindres pour les systèmes hydrauliques à huile, systèmes hydrauliques à eau, systèmes hydrauliques à émulsion ainsi que les systèmes hydrauliques à plasma et autres systèmes hydrauliques à d'autres liquides, procédé dans lequel des cylindres (1) à deux pièces ou plus qui présentent un corps de base (2) et un piston (5) avec tige de piston (6) disposé de manière décalable à l'intérieur dudit corps sont déployés ou rétractés de manière contrôlée par l'intermédiaire de soupapes et du transmetteur de pression intégré qui a traversé une pompe haute pression, étant donné qu'une pression prédéfinie même après l'éloignement est générée et maintenue dans un creux (8) à la surface du piston au-dessous du piston (5) correspondant avec tige de piston (6), étant donné qu'un transmetteur de pression comme de l'huile, de l'eau, une émulsion, du plasma de pression prédéfinie est tout d'abord introduit dans le cylindre (1), c'est-à-dire dans le creux (8) à la surface de son piston, et le cylindre (1) étant ainsi déployé,
    caractérisé en ce que
    la pression à l'intérieur du creux (8) à la surface du piston est alors augmentée au moyen d'un piston tendeur (16) avec tige de piston (17) correspondante disposé de manière décalable dans la tige de piston (6) et servant de compresseur (10), étant donné que, pour la compression du transmetteur de pression dans le creux (8) à la surface du piston, le transmetteur de pression à pression prédéfinie est introduit ; à cet effet, le piston tendeur (16) avec tige de piston (17) correspondante disposé de manière décalable dans la tige de piston (6) est inséré à l'aide du transmetteur de pression à pression prédéfinie dans le creux (8) à la surface du piston et son volume est ainsi réduit.
  2. Arrangement avec cylindre et pompe haute pression destiné à l'exécution du procédé selon la revendication 1, le cylindre (1) se composant
    - d'un corps de base (2) avec boîtier de cylindre (3) et couvercle de cylindre (4) relié par l'intermédiaire d'une conduite d'alimentation (7) avec la pompe haute pression, et
    - d'un piston (5) avec tige de piston (6) disposé à l'intérieur dudit corps de base de manière décalable, étant donné qu'est formé entre le couvercle de cylindre (4), le piston (5) et la tige de piston (6) un creux (8) à la surface du piston, ainsi que
    - d'un compresseur (10) pouvant être inséré dans le creux (8) à la surface du piston, lequel compresseur est formé comme piston tendeur (16) avec une plus petite tige de piston (17) disposé de manière décalable dans la tige de piston (6) plus grande et sert de compresseur à l'intérieur du creux (8) à la surface du piston,
    caractérisé en ce que
    le compresseur (10) est relié pour la transmission d'un transmetteur de pression à même pression côté tête de son piston tendeur (16) avec la même pompe haute pression disposée dans la conduite d'alimentation (7) de manière à ce que le creux (8) à la surface du piston, c'est-à-dire le transmetteur de pression qui s'y trouve, soit formé de façon à pouvoir être influencé par la même pompe haute pression d'une part directement par l'intermédiaire d'une soupape d'admission (9) et, en plus, indirectement par l'intermédiaire du compresseur (10).
  3. Cylindre selon la revendication 2,
    caractérisé en ce que
    le creux (8) à la surface du cylindre est formé comme alésages (11, 12, 13) réalisés dans le couvercle de cylindre (4), le piston (5) et la tige de piston (6), étant donné que l'alésage (13) dans la tige de piston (6) est élargi de manière à loger une douille (15) dans laquelle le piston tendeur (16) avec une petite tige de piston (17) correspondant à l'alésage (12) est disposé de manière décalable.
  4. Cylindre selon la revendication 3,
    caractérisé en ce que
    la douille (15) qui loge le piston tendeur (16) se termine par une tête de tige (19) qui obture également la grande tige de piston (6), tête de tige à laquelle sont affectés des alésages de raccordement (20, 21) reliant côté tête la soupape de raccordement (18) et le piston tendeur (16).
  5. Cylindre selon la revendication 3,
    caractérisé en ce que
    le piston tendeur (16) présente un évidement (22) en forme de plateau sur le côté opposé à la tige de piston (17).
  6. Cylindre selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    la petite tige de piston (17) est réalisée avec une fente annulaire (26) entre elle et la paroi d'alésage (27) du piston (5), laquelle fente annulaire est reliée au côté inférieur (29) du fond de douille (30) pouvant être traversé par la petite tige de piston (17).
  7. Cylindre selon la revendication 6,
    caractérisé en ce que
    le fond de douille (30) est formé en plusieurs niveaux, étant donné que le petit niveau inférieur (31) en face de la paroi extérieure (28) de la petite tige de piston (17) et la paroi intérieure (33) de la grande tige de piston (6) présente des bagues d'étanchéité (34, 35) effectives.
  8. Cylindre selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    la douille (15) présente au niveau du fond de douille (30) un alésage transversal (40) reliant l'espace de bague d'air (37) entre la paroi intérieure de douille (38) et la paroi extérieure (28) de la petite tige de piston (17) avec un alésage longitudinal (39) vers l'atmosphère extérieure.
  9. Cylindre selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    est formé entre la paroi intérieure (43) du boîtier de cylindre (3) et la paroi extérieure (44) de la grande tige de piston (6) un espace annulaire (45) qui est obturé par le bas par le piston (5) avec bagues d'étanchéité (46, 47) et par le haut par un anneau obturateur (48) avec bagues d'étanchéité (49, 50, 51) intégrées, lequel anneau obturateur peut être relié par l'intermédiaire d'une soupape d'entrée (52) avec la même pompe haute pression.
  10. Cylindre selon la revendication 9,
    caractérisé en ce que
    l'anneau obturateur (48) dispose d'un filetage extérieur (54) qui est formé avec un filetage intérieur (56) correspondant affecté à l'extrémité (55) du boîtier de cylindre.
  11. Cylindre selon la revendication 9,
    caractérisé en ce que
    les bagues d'étanchéité (49, 50, 51) affectées à l'anneau obturateur (48) sont disposées de manière étanchéifiante en face de la grande tige de piston (6) et en face de l'espace annulaire (45).
EP04708712A 2003-02-14 2004-02-06 Procede et dispositif permettant l'augmentation de pression dans des cylindres, en particulier des etancons hydrauliques Expired - Lifetime EP1597484B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10306128A DE10306128A1 (de) 2003-02-14 2003-02-14 Verfahren und Vorrichtung zur Druckerhöhung in Zylindern, insbesondere hydraulischen Stempeln
DE10306128 2003-02-14
PCT/DE2004/000207 WO2004072486A1 (fr) 2003-02-14 2004-02-06 Procede et dispositif permettant l'augmentation de pression dans des cylindres, en particulier des etancons hydrauliques

Publications (2)

Publication Number Publication Date
EP1597484A1 EP1597484A1 (fr) 2005-11-23
EP1597484B1 true EP1597484B1 (fr) 2007-07-04

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EP04708712A Expired - Lifetime EP1597484B1 (fr) 2003-02-14 2004-02-06 Procede et dispositif permettant l'augmentation de pression dans des cylindres, en particulier des etancons hydrauliques

Country Status (6)

Country Link
US (1) US7424803B2 (fr)
EP (1) EP1597484B1 (fr)
AT (1) ATE366370T1 (fr)
AU (1) AU2004211436B2 (fr)
DE (2) DE10306128A1 (fr)
WO (1) WO2004072486A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE102006059040A1 (de) 2006-12-14 2008-06-19 Voss, Wolfgang Vorrichtung zur Druckerhöhung in Zylindern mit Schalteinrichtung
DE102007018021A1 (de) 2007-04-17 2008-10-23 Voss, Wolfgang Hydraulikstempel mit dünnwandigen Außen- und Innenrohren
PL2291586T3 (pl) * 2008-06-17 2012-11-30 Wolfgang Voss Urządzenia do podwyższania ciśnienia w cylindrach mające urządzenie przełączające
CN107503776A (zh) * 2017-08-10 2017-12-22 郑州四维机电装备制造有限公司 一种液压支架侧护板安装装置
CN113357246B (zh) * 2021-06-22 2022-11-11 青海左丌右电气技术服务有限公司 螺栓

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Publication number Publication date
US7424803B2 (en) 2008-09-16
US20060207251A1 (en) 2006-09-21
WO2004072486A1 (fr) 2004-08-26
DE502004004233D1 (de) 2007-08-16
AU2004211436B2 (en) 2009-10-08
EP1597484A1 (fr) 2005-11-23
DE10306128A1 (de) 2004-08-26
AU2004211436A1 (en) 2004-08-26
ATE366370T1 (de) 2007-07-15

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