EP2024112A1 - Procédé pour faire fonctionner un appareil de compression hydraulique ainsi qu'appareil de compression hydraulique avec une pompe hydraulique - Google Patents

Procédé pour faire fonctionner un appareil de compression hydraulique ainsi qu'appareil de compression hydraulique avec une pompe hydraulique

Info

Publication number
EP2024112A1
EP2024112A1 EP07729579A EP07729579A EP2024112A1 EP 2024112 A1 EP2024112 A1 EP 2024112A1 EP 07729579 A EP07729579 A EP 07729579A EP 07729579 A EP07729579 A EP 07729579A EP 2024112 A1 EP2024112 A1 EP 2024112A1
Authority
EP
European Patent Office
Prior art keywords
hydraulic
pressing device
piston
return valve
particular according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP07729579A
Other languages
German (de)
English (en)
Other versions
EP2024112B1 (fr
Inventor
Egbert Frenken
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gustav Klauke GmbH
Original Assignee
Gustav Klauke GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gustav Klauke GmbH filed Critical Gustav Klauke GmbH
Publication of EP2024112A1 publication Critical patent/EP2024112A1/fr
Application granted granted Critical
Publication of EP2024112B1 publication Critical patent/EP2024112B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J15/00—Riveting
    • B21J15/10—Riveting machines
    • B21J15/16—Drives for riveting machines; Transmission means therefor
    • B21J15/20—Drives for riveting machines; Transmission means therefor operated by hydraulic or liquid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
    • B25B27/10—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same inserting fittings into hoses

Definitions

  • the invention initially relates to a method for operating a hydraulic Verpresseries, in particular hand-pressing device, wherein the pressing device comprises a hydraulic pump, a moving part, a fixed part and a return valve, wherein further the moving part by the construction of a hydraulic pressure, which is filled by a Hydraulic chamber with hydraulic fluid from a reservoir using the hydraulic pump results in a Verpressgna is moved, wherein further the moving part is designed to automatically return under the action of a return spring of the injection position in an end position and the return valve is designed to close only after a certain, by the running back of the hydraulic fluid acting on the return valve pressure is undershot.
  • the pressing device comprises a hydraulic pump, a moving part, a fixed part and a return valve, wherein further the moving part by the construction of a hydraulic pressure, which is filled by a Hydraulic chamber with hydraulic fluid from a reservoir using the hydraulic pump results in a Verpressgna is moved, wherein further the moving part is designed to automatically return under the action of a return spring of the injection position in
  • Hydraulic injection devices and methods for operating the same are known. Reference is made in this regard, for example, to DE 198 25 160 Al. There, a hand-operated pressing device is described, which is provided with a return valve, which is triggered upon reaching or
  • a technical problem of the invention is seen as providing a method for operating a hydraulic pressing device, which allows an optional stopping of the moving part in one position.
  • means are provided which influence the return flow of the hydraulic fluid in front of the return valve, ie between the moving part and the return valve such that an optionally only short-term pressure drop is established, which is sufficient to cancel the preferably provided latching of the return valve in the open position.
  • the holding pressure of the return valve is lowered, after which the return valve falls into the closed position. Accordingly, no hydraulic fluid flows from the storage room.
  • the remaining hydraulic fluid cushion in front of the moving part causes it to stop.
  • the means which act on the return flow of the hydraulic means to stop the moving member may be purely mechanical means which are deliberately actuated by the user when needed.
  • the return line between the moving part and return valve can be closed by a slide, whereby the desired pressure drop is achieved at the return valve.
  • This slider closure can be carried out, for example, electromechanically, so on, for example, triggered by a pulse to start a new injection process, ie a pulse to start the hydraulic pump.
  • a separate push-button or the like may also be provided on the hydraulic pressing device for stopping the return movement of the moving part, by means of which push-button the mechanism influencing the flow can be acted on mechanically or electrically.
  • the effect on the backflow is preferably only for a short time. The immediately adjusting pressure drop leads to an almost sudden closing of the valve, after which a further influence by the means is not necessary.
  • a short-term decoupling of a subset of the hydraulic fluid to the flow which leads short-term decoupling to a pressure drop of the return line.
  • the short-term decoupling of a subset can be achieved, for example, by a temporarily released line branch, in which, for example, a piston-like Middle is arranged. This sucks a subset of the actual return path, if necessary, resulting in the desired pressure drop.
  • the pressure drop to achieve the return valve closure position is on the order of about 0.5 to 1 bar.
  • the latching of the return valve in the course of the movement part return is achieved at a pressure of about 0.5 to 2.5 bar, so on, in particular at 1.5 bar, while the first opening of the return valve to complete the compression process at a pressure of about 400 to 800 bar, so on, in particular at 500 or 700, preferably at 600 bar, after which a return spring, which acts on the moving part in the return directly in the region of the moving part, a pressure of about 1.5 to 5 bar, preferably 2.5 bar is present.
  • the pressure difference of at least one bar between the region acted upon by the returning moving part and the area of the return valve is consumed mainly as a throttle loss when flowing through smaller, cooperating in the closed position with smaller Operakol- surfaces bores of the sealing seat.
  • the switching piston is preferably held solely by the return flow in a non-actuated sequence position, wherein the switching piston in this Patterson ein a flow passage for the returning hydraulic fluid leaves.
  • This flow passage is further dimensioned so large that this results in no negative impact on the self-retention of the return valve pressure losses.
  • the switching piston leads to a shut-off of the flow, ie the return flow thus triggering a pressing operation immediately causes the displacement of the switching piston in a shut-off position.
  • this barrier leads to a pressure drop at the return valve, according to which this closes.
  • the displacement of the switching piston due to the startup of the pressing device against the flow direction of the returning hydraulic fluid further causes a suction of a subset of the hydraulic fluid, which further supports the desired pressure drop to close the return valve.
  • the switching piston can be brought into the pumping position, for example by mechanical means, when a new pressing process is triggered.
  • the control piston is arranged with its piston surface in the flow path of the hydraulic fluid such that by commissioning the hydraulic pump, the pumped hydraulic fluid initially via the control piston a displacement of the control piston from the drain position causes in the pumping position, this to produce a pressure drop to close the return valve ,
  • the invention further relates to a hydraulic compression device with a hydraulic pump, a moving part, a fixed part and a return valve, wherein the moving part moves from a starting position into a Verpress- position due to filling a hydraulic space with hydraulic fluid from a storage container by means of the hydraulic pump, wherein the return valve automatically moves as a function of a hydraulic pressure corresponding to the injection position in an open position and the moving part moves back under the action of a return spring.
  • a pressing device of the type in question is known from the above-cited DE 198 25 160 Al.
  • the invention has for its object to design a hydraulic compression device of the type in question in particular handling technology improved.
  • the return movement after exceeding the pressure threshold reached in the course of the pressing process or triggered by a manual intervention in the course of the forward displacement of the moving part can be stopped at any time according to the present invention, including means are provided which are suitable for the self-holding of the return Holding valve in the open position required reduce pressure such that a drop in the return valve is achieved.
  • the means engage in the return flow of the hydraulic medium between the movement part and the return valve.
  • the pressure drop achieved by the means moves in this case in the order of 0.5 to 5 bar, preferably 1 to 1.5 bar, wherein further acting on the return valve pressure for latching the valve in the open position between 0.5 and 5 bar, preferably 1.5 bar.
  • the hydraulic chamber has a first subspace in which moves the moving part and a second subspace, which is designed as a line section, in which the hydraulic fluid for filling or emptying of the first subspace flows and that the means are arranged in the second subspace.
  • the movement part is of a piston-like design for direct application to a piston or piston rod assigned to the tool that can be assigned to the pressing device.
  • the first subspace which comprises this movement part, in particular cylindrically, is essentially separated from the second subspace upstream in the inflow direction, with a fluid connection of the subspaces initially being achieved by means of an inflow channel.
  • a return channel through which the hydraulic fluid flows after triggering the return valve and corresponding displacement thereof into the open position according to the spring-loaded return displacement of the moving part, is optionally switchably designed to connect the two partial spaces.
  • the means may be designed for the short-term decoupling of a subset of the hydraulic medium.
  • a pressure reduction can be achieved by a slide-like member, which is inserted into the flow path between the movement part and the return valve, interrupting the flow.
  • a brief negative pressure effect on this flow path lead to a corresponding uncoupling of a subset of the return flow, which has a corresponding decrease in pressure at the return valve result.
  • a transverse channel opening into the return flow channel can be provided in this case, in which a piston-like means for triggering the return stop acts in an absorbent manner on the returning hydraulic medium.
  • the means are formed in the line section for switching between a first and second conduction path, the decoupling taking place in the course of the changeover.
  • the means switch in the line section between the line paths for the flow of the moving part in the course of a pressing operation and the conduction path for the return flow of the hydraulic fluid in the course of the return displacement of the moving means.
  • the decoupling of a subset of the hydraulic medium in the course of the return is preferably derived from the movement of the means resulting from the switching over of the means between the first and second conduction paths. Accordingly, the movement of the means and the decoupling is coupled to the pressure reduction before the return valve.
  • the means consist of a movable in the second compartment switching piston. This is displaceable in the second subspace along a piston body axis displaceable between two end positions, which end positions on the one hand the preliminary position of the hydraulic means for acting on the moving part and on the other hand the return Running position of the hydraulic means correspond with open return valve.
  • the switching piston has an effective piston surface and a piston stem. The latter is for releasing or closing a hydraulic line connected downstream of the hydraulic pump, in particular the first flow line connecting the first subspace to the second subspace.
  • the switching piston is in this case preferably positioned and designed such that in the usual operating position, in which hydraulic medium is pumped into the hydraulic space via the hydraulic pump, the latter remains in a predisplaced position, in which the aforementioned hydraulic line is unlocked. Further, the piston head for releasing or closing a return valve leading to the drain line is formed such that in the vorverlagerten pumping position, in which the hydraulic line between the first and second subspace is unlocked, leading to the return valve drain line is blocked by the piston head.
  • the switching piston In the return position, ie after exceeding the maximum pressure in the hydraulic chamber - possibly triggered manually by opening the return valve - the switching piston falls into a retracted position in which this initially closes the flow-hydraulic line and at the same time opens the return line leading to the drain line between the hydraulic chamber and return valve.
  • the switching piston serves accordingly in the transmitted sense as a pressure-dependent two-way valve for the alternate release / closure of flow line and return line.
  • the switching piston has three mutually separate loading surfaces. These extend in a plane perpendicular to the displacement direction of the control piston and are preferably formed circular-disk-shaped or annular.
  • a first contiguous loading surface of the switching piston is preferably associated with the first subspace, so according to the hydraulic space receiving the moving part.
  • This contiguous loading surface is preferably circular disk-shaped, further formed approximately flat surface.
  • a second opposite to the first aufschlagungs Solution arranged impingement surface is associated with the drain line, has accordingly in the direction of the second subspace.
  • This second loading surface is preferably formed annularly with an outer diameter which substantially corresponds to the outer diameter of the first opposing loading surface.
  • the inner diameter of the second loading surface is defined in a preferred embodiment by the outer diameter of the piston skirt.
  • a third, likewise opposite to the first loading surface arranged loading surface is associated with the hydraulic pump, is accordingly acted upon in direct manner by the hydraulic means in the course of advancement of the moving part in the context of a pressing operation.
  • This third loading surface is formed substantially circular disk-shaped, with an outer diameter which substantially corresponds to the outer diameter of the piston skirt.
  • the second and third loading areas correspond in terms of size to the first loading area.
  • both further loading surfaces lie within the first loading surface.
  • the switching piston is preferably movable between a drainage position and a pumping position.
  • the switching piston is moved into the pumping position by the application of hydraulic fluid, in particular of the third loading surface.
  • the switching piston is displaced in the opposite direction into the expiration position.
  • the piston head is received in an enlarged diameter relative to the piston head annulus, which annulus merges into the drain line.
  • This annular space is not necessarily provided over the entire circumference of the piston head. It may also be provided with respect to a floor plan segmental radial enlargements relative to the piston head.
  • the piston closes in the pumping position in which the aforementioned hydraulic line is released, the drain line like a slide, wherein further the slide-like closing movements of the switching piston are synchronized so that no simultaneous opening of drain line and hydraulic line (flow line) can be achieved.
  • the slide-like closure of the hydraulic line preferably prefers the slide-like opening of the drain line.
  • the switching piston has an integrated pressure relief valve.
  • This is preferably formed the first and the opposite third loading surface of the switching piston line connecting, which opens the integrated line of the control piston at overpressure valve controlled.
  • the pressure relief valve is formed by a means of a journal-held, tellerfederieri valve disc. This is preferably on the side of the first loading surface, the associated opening edge of the pressure line overlapping.
  • the central holding the valve disc spigot is in one another embodiment surrounded by the valve disc covered by the overpressure line, which pin is also centrally preferably coaxially positioned to the switching piston axis.
  • the pin is designed as a screw whose screw head acts on the valve disc displaceable against the peripheral edge of the associated opening of the overpressure line.
  • Figure 1 is a hydraulic pressing device in view, partially cut in the region of a movement part having a hydraulic chamber with arranged on the pressing device, operable via the moving part Verpressvorsatz.
  • FIG. 2 shows region II according to the illustration in FIG. 1 in a longitudinal section, relating to a returned basic position
  • FIG. 3 shows the region III in FIG. 2 in an enlarged view, illustrating the pumping position for achieving a compression
  • FIG. Fig. 4 is a representation corresponding to Figure 3, but after exceeding a predetermined compression pressure and thereafter incipient, automatic return of the moving part with the return valve open, representing an intermediate position, in which overpressure a safety valve of a back-shifted control piston is open.
  • Fig. 5 is a sequential view of Figure 4, the return position with completelytechnischverlagertem switching piston regarding.
  • Fig. 6 is a representation corresponding to FIG. 5, but a situation starting from a return intermediate position shown in FIG. 5 or a mulchlauf-End position with re-entering pumping of hydraulic fluid and concomitant forward displacement of the control piston and closing the return valve.
  • FIG. 1 an electric motor-driven, hydraulic hand-pressing device 1 is shown and described.
  • a pressing device is known from DE 19944229 A1.
  • the content of this patent application is hereby incorporated in full into the disclosure of the present invention, also for the purpose of including features of this patent application in claims of the present invention.
  • an unillustrated electric motor is arranged in the pressing device 1.
  • the drive of this electric motor via a, integrated in a handle 2 accumulator 3.
  • a finger-operable switch 4 is pumped from a reservoir 5 hydraulic fluid (oil) in a hydraulic chamber 6, whereby a slidably received in the hydraulic chamber 5, piston-like movement part 7 is moved in the direction of a working end position.
  • the replaceable device head 10 can be fixed on the hydraulic cylinder 9 via a thread connection 13 on the outside of the mower.
  • the piston-like movement part 7 facing away from the tool carrier 11 is fixed to the device head 10, d. H. not displaceable executed.
  • the tool carrier 12 lying opposite this tool carrier 11, assigned to the movement part 7, can be displaced in the movement part displacement direction, for which purpose furthermore the displaceable tool carrier 12 is provided at the rear with a piston shaft 14. This is surrounded by a return spring 15, which further loads the piston skirt 14 in contact with the device-side movement part 7.
  • the return displacement of the moving part 7 takes place solely as a result of the restoring force of the spring 15, which via the piston skirt 14 or one end
  • the radial part associated with the movement part 7 acts on the movement part 7, the hydraulic medium from the hydraulic space 6 being pressed further back into the storage space 5 via the movement part 7.
  • the return valve 16 consists essentially of a valve piston 17 with a frontally centrally arranged, pointed conical needle tip 18, to form a, relative to the entire piston surface 19 substantially smaller and defined by the diameter of a connected to the hydraulic chamber 6 bore 20 part piston surface (poppet effective area ). The latter is closed by the needle tip 18 in a starting closure position as shown in FIG.
  • valve piston 17 is acted upon by a pressure spring 21, whereby the needle tip 18 is pressed against the bore 20 with a co-determining a maximum release pressure force.
  • a pressure-limiting valve in the seat type is essentially provided.
  • the return valve 16 opens at a force acting on the hydraulic piston surface 22 of the moving member 7 maximum pressure of 600 bar.
  • cut-off pressures between 400 and 700 bar for example 500, 550 or even 650 bar, can be used to open the return valve. run valve 16.
  • the maximum pressure is defined by the projected onto the bore 20, very small partial piston surface of the needle tip 18 and by the cross-sectional area of the bore 20 and by the contact pressure of the pressure spring 21 on the valve piston 17th
  • valve piston 17 If the pressure of the hydraulic fluid exceeds the predefined maximum value of, for example, 600 bar, then the valve piston 17 is moved out of its seat 20 sealing against the force of the pressure spring 21, after which the substantially larger piston area 18 of the valve piston 17 comes into effect. As a result of the backward displacement of the valve piston 17, a drain 24 arranged in the cylinder 23 accommodating the valve piston 17 is at least partially exposed to the return flow of the hydraulic fluid into the reservoir 5.
  • the return valve 16 acts as a pressure relief valve, but this in Lekssschieberbauart with a much lower limiting pressure, since the latter is now defined by the much larger piston surface 19 of the valve piston 17.
  • a diameter ratio of smaller effective part of the piston tip (needle tip 18 in bore 20) to the total piston area 19 of 1: 400 given, with the result that the limiting pressure in the open position of the return valve 16 by 400 times smaller is considered the trigger pressure.
  • the restoring spring 15 acting on the moving part 7 is designed with regard to its restoring force so that the pressure in the hydraulic chamber 6 during retraction of the moving part 7 is always at least 2.5 bar.
  • the pressure difference of at least 1 bar is consumed mainly as it flows through the small bore 20 of the return valve 16 as a throttle loss and determines the oil flow and thus the retraction speed of the moving part.
  • the return valve 16 falls back into the closed position, wherein the relevant Ventilkolbenl7 is displaced by means of the pressure spring 21 again in the bore- closing position, in which position the needle tip 18 in the Bore 20 rests. This undershooting of the limiting pressure is reached at the latest when the movement part 7 occurs in the course of the return movement stop limited to the associated cylinder bottom.
  • the pressing device 1 is hereafter in an automatic, purely spring-loaded return.
  • means 25 are provided which, in the course of the hydraulic fluid return, reduce the return valve 16 in the open position at least for a short time so that the latching of the return valve 16 is released and the valve piston 17 closes the bore 20 by means of the needle tip 18 withdrawal begins.
  • a displaceable in the same direction as the moving part 7 switching piston 26 is provided. This is held in an insert 27, which is received in a bore-like continuation 28 of the hydraulic chamber 6 is substantially cylindrical.
  • the insert part 27 is provided with a circumferential annular seal 29 for sealing against the wall of the bore-like continuation 28.
  • the insert part 27 is fixed by a screw 30 which engages in the bottom of the bore-like continuation 28 facing away from the movement part 7 and whose screw head rests in a line section 31 which essentially passes through the insert part 27.
  • the line section 31 is aligned corresponding to coaxial with the body axis of the insert member 27.
  • the switching piston 26 which is also formed as a rotary member.
  • the switching piston 26 has a piston shaft 32 with an outer diameter which corresponds to the inner diameter of the line section 31.
  • the piston head is enlarged in diameter.
  • the head diameter corresponds approximately to twice the shaft diameter, wherein further the force measured in the axial direction of the collar-like projecting piston head 33 corresponds approximately to a quarter of the free axial extension length of the piston shaft 32.
  • the line section 31 is at one end, the switching piston 26 facing away from the flow connected to a Hydraulik.-supply line 34 of the Verpress- device 1, through which the latter by means of a pump, not shown, hydraulic fluid from the reservoir 5 with the interposition of a check valve 35 is promoted.
  • a Hydraulik.-supply line 34 of the Verpress- device 1 through which the latter by means of a pump, not shown, hydraulic fluid from the reservoir 5 with the interposition of a check valve 35 is promoted.
  • From the central line section 31 is a radially outwardly to the jacket wall guided hydraulic line 36, which opens in a by reduction in diameter of the insert 27 between the insert member 27 and the bore-like continuation 28 created annular space. This annular space opens towards the hydraulic chamber 6 on the side of the piston surface 22 of the moving part 7.
  • the insert 27 is correspondingly connected in the supply line between the storage space 5 and the hydraulic chamber 6.
  • the insert member 27 is also connected between the hydraulic chamber 6 and the return valve 16, to which the insert member 27 is arranged eccentrically to the body axis of the insert member 27, i. W. axially parallel drain line 37 which opens at one end in a device housing-side return line 38.
  • the latter is connected to the return valve 16, specifically with the valve seat side bore 20th
  • the switching piston 26 is aligned in the insert member 27 coaxially with the insert part axis and held stop-end slidably on both sides in the axial direction.
  • the piston shaft 32 is in this case in the line section 31 of the insert member 27, while the diameter-enlarged piston head 33 rests in a correspondingly enlarged diameter, the hydraulic chamber 6 out open bore portion 39 is guided.
  • a rear abutment surface delimiting the movement of the control piston 26 in the direction of the line section 31 is provided by the bore section bottom 40 penetrated by the line section 31.
  • the head of an end face of the insert part 27 has a stop-limiting screw 41 screwed in, the head of which protrudes radially inwards over the associated bore-cut edge.
  • the insert part-side drain line 37 opens approximately with half the opening cross section in which the switching piston 26 leading bore portion 39. Accordingly, the axis of the drain line 37 is positioned so that it enters approximately in the outer wall of the bore portion 39.
  • the associated transition region from the bore section wall to the bore section bottom 40 is enlarged in diameter relative to the further bore section 39 and the outer diameter of the piston head 33, so that when the control piston 26 is retracted, ie in the stop position thereof against the bore section bottom 40, a free flow area in the form of an annular space 50 for connecting the drain line 37 with the hydraulic chamber 6 sets.
  • the axial length of the piston shaft 32 and the axial travel of the switching piston 26 and the positioning of the radially aligned hydraulic line 36 are selected so that in a pumping position as shown in FIG. 3 and associated advancement of the control piston 26, in which this stop limited against the screw 41 enters, the hydraulic line 36 is in fluid communication with the central conduit section 31.
  • a first loading surface 42 which faces the hydraulic chamber 6 and is defined by the corresponding transversely to the axis aligned piston head surface.
  • the third loading surface 43 is defined by the end surface of the piston skirt 32 facing away from the first loading surface 42 and aligned transversely with respect to the axis. This third loading surface 43 is offset parallel to the first loading surface 42.
  • the second loading surface is 44 annularly formed by the surface of the piston head 33 facing away from the first loading surface 42, which second loading surface 44 is also at the same time the counter stop surface cooperating with the stop surface formed by the bore portion bottom 40.
  • a loading area ratio of the third loading surface 43 to the first loading surface 42 is from 1: 2 to 1: 4, preferably 1: 3, while the Ratio of second loading surface 44 to the first loading surface 42 1: 2 to 3: 4, preferably 2: 3.
  • the insert part 27 or the line paths provided in the insert part 27 are altogether part of the hydraulic chamber 6, wherein the control piston 26 subdivides these into two subspaces, thus into a first subspace 45, in which the movement part 7 moves and a second subspace 46, which moves the forms aforementioned line sections within the insert part 27.
  • the switching piston 26 further has an integrated pressure relief valve 47.
  • This is essentially formed by a plate-spring-like valve disc 49 supported by means of a pin 48 forming a journal.
  • This valve disc 49 covers a substantially the switching piston 26 centrally in the axial direction passing through pressure line 51, which faces the Hy daulaulraum 6 centrally passes the piston head 33.
  • a radial jump of the line is provided to further centrally provide a threaded mounting portion for the screw 48, the screw head pushes the valve disc 49 against the facing peripheral edge of the pressure line 51.
  • the valve disc 49 In an over-pressure-unaffected position as shown in FIG. 3, the valve disc 49 in a loaded by the screw 48 rest position in which it closes the pressure line 51.
  • the hydraulic medium is pumped into the hydraulic chamber 6 via the hydraulic line 36, which causes an axial displacement of the movement part 7 displaceably held in this hydraulic chamber 6 and, via this, of the device head side piston shaft 14 for obtaining the injection position.
  • the switching piston 26 has the hydraulic line 36 closed like a slide and thereafter the drain line 37 also opened like a slide.
  • the hydraulic means can thereafter be expressed in a spring-loaded manner via the movement part 7 from the hydraulic space 6, with the flow around the piston head 33.
  • the piston head 33 in this case leaves the diameter-enlarged annulus area of the bore section 39; Accordingly, a short-term decoupling of a subset of the located in the drain line 37 hydraulic means is achieved, so in particular by generating a short-term suction effect in the region of the second, annular and the drain line 37 facing Beauftell This causes an at least temporary pressure drop in the drain line 37 and correspondingly in the return line 38, which pressure drop due to the spring load on the valve piston 17 has an immediate closing of the return valve 16 result. The drainage of the hydraulic fluid is interrupted accordingly.
  • the switching piston 26 is urged by the hydraulic means into the stop-limited position by the screw 41 as shown in FIG. 3, after which the forward displacement of the moving part 7 and according to the pressing process is performed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Check Valves (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Press Drives And Press Lines (AREA)

Abstract

L'invention concerne d'une part un procédé pour faire fonctionner un appareil de compression hydraulique (1), une partie mobile (7) étant déplacée dans une position de compression par l'augmentation d'une pression hydraulique qui résulte du remplissage d'un espace hydraulique (6) avec un fluide hydraulique provenant d'un réservoir (5), la partie mobile (7) étant en outre conçue pour revenir automatiquement de la position de compression dans une position d'extrémité sous l'action d'un ressort de rappel (15) et la soupape de non retour (16) étant conçue pour se fermer seulement en dessous d'une pression déterminée agissant sur la soupape de non-retour (16) par le retour du fluide hydraulique ; l'invention concerne aussi un tel appareil de compression hydraulique (1). Afin de disposer d'un procédé qui permette de maintenir au choix la partie mobile dans une position, on utilise selon l'invention des moyens (25) pour agir sur le fluide hydraulique s'écoulant lorsque la soupape de non-retour (16) est ouverte, avant la soupape de non-retour (16), lesquels s'opposent à l'écoulement du fluide hydraulique de telle sorte qu'une chute de pression s'établissant conduise au déplacement de la soupape de non-retour (16) dans la position de fermeture. Concrètement, on obtient une amélioration technique de manipulation par le fait que des moyens (25) agissent sur l'écoulement du fluide hydraulique dans le but d'abaisser la pression de telle sorte que la soupape de non-retour (16) se déplace dans la position de fermeture.
EP07729579.8A 2006-06-08 2007-05-29 Procédé pour faire fonctionner un appareil de compression hydraulique ainsi qu'appareil de compression hydraulique Active EP2024112B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006026552A DE102006026552A1 (de) 2006-06-08 2006-06-08 Verfahren zum Betreiben eines hydraulischen Verpressgerätes sowie hydraulisches Verpressgerät mit einer Hydraulikpumpe
PCT/EP2007/055156 WO2007141156A1 (fr) 2006-06-08 2007-05-29 Procédé pour faire fonctionner un appareil de compression hydraulique ainsi qu'appareil de compression hydraulique avec une pompe hydraulique

Publications (2)

Publication Number Publication Date
EP2024112A1 true EP2024112A1 (fr) 2009-02-18
EP2024112B1 EP2024112B1 (fr) 2017-06-14

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EP07729579.8A Active EP2024112B1 (fr) 2006-06-08 2007-05-29 Procédé pour faire fonctionner un appareil de compression hydraulique ainsi qu'appareil de compression hydraulique

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US (1) US7908963B2 (fr)
EP (1) EP2024112B1 (fr)
KR (1) KR101469451B1 (fr)
CN (1) CN101500728B (fr)
DE (1) DE102006026552A1 (fr)
ES (1) ES2633924T3 (fr)
RU (1) RU2428301C2 (fr)
WO (1) WO2007141156A1 (fr)

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Also Published As

Publication number Publication date
RU2428301C2 (ru) 2011-09-10
EP2024112B1 (fr) 2017-06-14
RU2008152791A (ru) 2010-07-20
DE102006026552A1 (de) 2007-12-13
ES2633924T3 (es) 2017-09-26
KR20090017697A (ko) 2009-02-18
CN101500728A (zh) 2009-08-05
US20090133591A1 (en) 2009-05-28
US7908963B2 (en) 2011-03-22
KR101469451B1 (ko) 2014-12-05
CN101500728B (zh) 2013-06-12
WO2007141156A1 (fr) 2007-12-13

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