EP0062206B1 - Dispositif pneumatique-hydraulique pour la pose de rivets aveugles - Google Patents

Dispositif pneumatique-hydraulique pour la pose de rivets aveugles Download PDF

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Publication number
EP0062206B1
EP0062206B1 EP82102325A EP82102325A EP0062206B1 EP 0062206 B1 EP0062206 B1 EP 0062206B1 EP 82102325 A EP82102325 A EP 82102325A EP 82102325 A EP82102325 A EP 82102325A EP 0062206 B1 EP0062206 B1 EP 0062206B1
Authority
EP
European Patent Office
Prior art keywords
piston
blind
traction
tool according
compressed air
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.)
Expired
Application number
EP82102325A
Other languages
German (de)
English (en)
Other versions
EP0062206A3 (en
EP0062206A2 (fr
Inventor
Günter Klein
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.)
Gesipa Blindniettechnik GmbH
Original Assignee
Gesipa Blindniettechnik 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 Gesipa Blindniettechnik GmbH filed Critical Gesipa Blindniettechnik GmbH
Priority to AT82102325T priority Critical patent/ATE13825T1/de
Publication of EP0062206A2 publication Critical patent/EP0062206A2/fr
Publication of EP0062206A3 publication Critical patent/EP0062206A3/de
Application granted granted Critical
Publication of EP0062206B1 publication Critical patent/EP0062206B1/fr
Expired legal-status Critical Current

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Classifications

    • 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
    • B21J15/22—Drives for riveting machines; Transmission means therefor operated by both hydraulic or liquid pressure and gas pressure
    • 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
    • B21J15/105—Portable riveters
    • 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
    • B21J15/30—Particular elements, e.g. supports; Suspension equipment specially adapted for portable riveters
    • B21J15/32—Devices for inserting or holding rivets in position with or without feeding arrangements
    • B21J15/326—Broken-off mandrel collection
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/53709—Overedge assembling means
    • Y10T29/53717—Annular work
    • Y10T29/53726—Annular work with second workpiece inside annular work one workpiece moved to shape the other
    • Y10T29/5373—Annular work with second workpiece inside annular work one workpiece moved to shape the other comprising driver for snap-off-mandrel fastener; e.g., Pop [TM] riveter
    • Y10T29/53739—Pneumatic- or fluid-actuated tool
    • Y10T29/53743—Liquid
    • Y10T29/53748—Liquid and gas

Definitions

  • the invention relates to a pneumatic-hydraulic blind riveting device for setting blind rivets consisting of a rivet sleeve and a tear-off mandrel, with a pneumatic cylinder in which a pressure piston and a plunger which is rigidly connected to it and sealed and plunges into a subsequent hydraulic chamber can be moved back and forth, and with a device head adjoining the hydraulic chamber, in which a pulling device carrying the chuck mechanism for gripping the pulling mandrel can be moved back and forth pneumatically and hydraulically, wherein a through-channel for the ejection of the pulling mandrels torn off during the riveting process is provided in the device head.
  • Such a blind riveting tool is e.g. B. known from DE-PS 2 419 190.
  • the traction consists essentially of a piston which can be sealed in a cylinder space of the device head, which rests in the rest position of the device on a stop formed in the cylinder space and which has a piston shaft on each side, of which the piston located on the side of the mouthpiece of the device head Carries the feed mechanism and the other protrudes into an opening provided on the side of the device head opposite the mouthpiece and aligned with it.
  • the passage channel for the ejection of the mandrel torn off during each riveting process passes through the piston and its two piston shafts.
  • the cylinder space of the device head is connected to a hydraulic chamber on the side of the piston facing the mouthpiece.
  • the compressed air preferably escapes from the pneumatic cylinder via a quick exhaust valve, and all parts can be returned to their starting position.
  • the torn mandrel is then still in the passage channel of the pull piece formed from the piston displaceable in the device head together with its piston shafts, so that the operator of the device must first make a pivoting movement in order to eject the mandrel from the passage channel in the device head.
  • a device has therefore already been proposed in which, behind the clamping jaws of the chuck mechanism, an air duct connected to a compressed air source opens into the passageway of the blind riveting device in such a way that a compressive force is exerted on the mandrel lying in the passageway, which compresses the torn mandrel into one at the end of the passage channel arranged container transported.
  • This known device has the disadvantage that the compressed air supply takes place in the area of the feed mechanism, which requires special training of the feed mechanism and the actuating device for the feed mechanism. Furthermore, the air connection must participate in the axial movement of the chuck mechanism during the riveting process, so that a particularly robust design of the feed line is necessary.
  • Another disadvantage of the known device is that the effect of the compressed air introduced into the passage channel is also directed against the newly inserted mandrel for the next riveting process, so that it can be pushed out of the chuck mechanism again.
  • DE-OS 2 827 904 which is designed as an additional device for pneumatically operated blind riveting devices and consists of a collecting container which can be attached tightly to the device head of the blind riveting device and which, preferably in its removable cover, has a vacuum system operated by compressed air contains, which can be connected via a connecting line to a compressed air source, which is preferably also that of the blind riveting tool.
  • a vacuum is generated in this container by the vacuum system contained in the collecting container, which then pulls the torn mandrel out of the chuck mechanism through the passage channel in the device head and hurls it into the collecting container.
  • this additional device practically any (pneumatically) operated blind riveting tool can be retrofitted in a simple manner by only placing the container containing the vacuum system tightly on the device head and a connecting line between the connection of the vacuum system and the compressed air source, that is to say preferably the part of the connecting nipple which carries compressed air of the blind riveting tool is connected.
  • this additional device also consumes additional energy because compressed air must not only be provided for the actual riveting process, but also for the ejection or suction of the torn mandrel, and the production and supply of compressed air is known expensive.
  • the vacuum system To the negative pressure in the collecting container during operation the vacuum system must be constantly supplied with compressed air; this creates a u. U.
  • connection line between the vacuum system in the Aultang container and the compressed air connection which must always be installed on the outside of the device when retrofitting a blind riveting device, can be a hindrance.
  • the continuous operation of the vacuum system can result in the advantage that a blind rivet inserted into the mouthpiece is held in the mouthpiece by the negative pressure generated in the device head before its mandrel is gripped by the chuck mechanism.
  • this small advantage is generally not related to the high energy consumption and the annoyance caused by the constantly generated compressed air. In certain ways of working, it can even turn into a disadvantage; if the blind rivets are inserted into the material to be riveted, the rivet can be pulled out of the rivet hole when the blind riveting tool approaches due to the continuous operation of the vacuum system.
  • the object of the invention is, while avoiding the disadvantages described, to integrate a device for ejecting or extracting the mandrel torn off during the riveting process into the blind riveting device.
  • the suction or blowing out of the mandrel should take place automatically after each riveting process, but as energy-saving as possible.
  • the compressed air required for the riveting process should also be able to be used for suctioning off the rivet mandrels torn off during the riveting process.
  • the device should also be designed for certain applications so that it can keep the rivet ready in the mouthpiece even before the riveting process with a constant metered supply of compressed air.
  • the entire blind riveting device should be compact in terms of its outer dimensions and relatively small, and light in weight, yet powerful, and in particular be able to process all commercially available rivets with rivet diameters of up to 1/4 inch.
  • the compressed air can preferably be introduced into the passage channel through a nozzle located behind the mandrel in the ejection direction.
  • the suction device for the torn off mandrels is thus integrated into the actual blind riveting device, and the compressed air that is necessarily required to carry out the riveting process is advantageously used twice, namely for the riveting process and for suctioning the mandrel.
  • the suction process is carried out automatically after the riveting process, but saves energy because compressed air does not have to be supplied separately for suction.
  • the intermittent operation of the compressed air for riveting and suctioning the mandrel also saves energy compared to continuous operation according to the prior art; the noise and train annoyance of the operator is greatly reduced.
  • a nozzle tube is arranged concentrically in the passage channel to the inner wall of the passage channel, the end facing away from the chuck mechanism is widened radially in the direction of the wall of the passage channel and thus forms the nozzle, wherein the compressed air through a bore in the wall of the passage channel into the Gap between the inner wall of the passage and the nozzle tube can be introduced.
  • the passage channel is formed by a hollow cylindrical pulling element arranged coaxially in the device head, which carries the chuck mechanism at one end and a pulling piston which can be displaced tightly in the device head at its other end, and in from the side of the pulling piston the tension piece inserted pressure tube that pierces the end cover of the device head.
  • the nozzle tube can rest with one end sealingly on a pressure bush arranged inside the tension piece, resting on the chuck jaws of the chuck mechanism and with its widened end forming the nozzle, it can protrude into the pressure tube, a compression spring surrounding the nozzle tube between the pressure bushing and the pressure tube is arranged.
  • the suction device can be set up in an advantageous manner using components already present in the blind riveting device and inserting only relatively few additional components and thus in a space-saving and cost-effective manner in the blind riveting device.
  • the construction of the blind riveting device remains compact despite the additionally integrated device and is nevertheless powerful.
  • a further piston is preferably assigned to the pull piston, by means of which the compression spring can be relieved. This avoids a lifting movement of the traction piston when the riveting tool is depressurized, which could lead to a vacuum or to air ingress in the hydraulic chamber.
  • the tension piece can advantageously be surrounded by a cylinder sleeve below the tension piston at its end facing the traction piston has a radially inward shoulder against which the traction element can be moved tightly and, moreover, leaves an annular space for the traction element, into which the housing bore for supplying the compressed air opens;
  • Ring piston be surrounded, which is located in the starting position of the pull piece outside the cylinder sleeve and creates a connection between the space surrounding it and the bore in the pull piece and in the retracted state of the pull piece is inside the cylinder sleeve and seals the bore against the surrounding space abuts the wall of the cylinder sleeve.
  • the compressed air introduced to carry out the riveting process and, after completion of the riveting process, redirected by reversing a valve into the aforementioned housing bores, is initially briefly stored and only admitted into the nozzle according to the invention when the pulling device and with it the chuck mechanism still holding the torn off pulling mandrel have almost returned to their starting position, so that the suction effect of the compressed air emerging from the nozzle only comes into effect when the torn mandrel is released by the chuck mechanism.
  • the housing bore guiding the compressed air for the suction process opens via a puncture in the cylinder sleeve into the annular space formed in the retracted state of the pull piece between the shoulder of the cylinder sleeve lying close to it and the annular piston.
  • the reversed compressed air is initially also stored in this annular space, and the compressed air thus acting on the annular piston advantageously supports the return of the pulling device and the chuck mechanism to its starting position before the compressed air is passed on to the nozzle in the passage channel.
  • the passage channel preferably opens into a collecting container which is mounted on the device head and has a connection to the atmosphere; the torn-off and extracted mandrels can be collected in a collecting container in a known manner.
  • the blind riveting device should not only allow the torn rivet mandrel to be sucked backwards into the collecting container provided at the end opposite the mouthpiece of the device head, but also to allow the torn rivet mandrel to be ejected forward through the mouthpiece. Therefore, in a further embodiment of the invention, after unscrewing a sleeve containing the mouthpiece and the chuck mechanism and screwable to the device head, the nozzle tube can be removed through the pulling element, and the blind riveting device can thus be operated without the nozzle tube with a mandrel ejection through the mouthpiece.
  • a collecting container, into which the passage channel opens, can be firmly connected to the device head.
  • the collecting container preferably consists of a cup with a suitably shaped sleeve pushed over it, both of which have at least one window-like opening in their wall, which can be closed or covered by rotating the sleeve against the cup, so that the collecting container is emptied in a convenient manner can be.
  • the collecting container has air outlet openings in its base.
  • the collecting container is preferably made of plastic; its base can be cut out in a circle, and a baffle plate with passage openings is then held by the remaining base ring.
  • An adjustable pressure relief valve can be arranged in the pneumatic connection between the compressed air connection and the passage channel.
  • the area sizes of the ring areas above and below the pressure piston are preferably approximated to one another to approximately the same values.
  • the approximation of the surface area of the ring surfaces above and below the pressure piston is achieved by means of a compensating piston which, on the one hand, is fastened to the cylinder pot base and, on the other hand, can protrude coaxially with the latter into the plunger piston into the region of the flange of the handle facing away from the device head.
  • the pneumatic-hydraulic blind riveting device consists of the device head A, the handle B enclosing the hydraulic part of the drive system and the pneumatic part C of the drive system.
  • the device head A consists of an essentially hollow cylindrical housing part 1, preferably made of hard-coated aluminum, into the front end of which a screw-in sleeve 3 carrying the mandrel receiving the mandrel of a blind rivet to be riveted is screwed with an inner diameter which is reduced to a certain extent compared to the housing part 1.
  • the sleeve 3 is preferably made of steel; the mouthpiece 2 can advantageously be exchangeable for different rivet diameters.
  • the steel sleeve 3 may have a hole on the side or, preferably opposite one another, two side holes which serve to promote the ejection of the torn rivet mandrel to the rear when the blind riveting tool is in contact with the blind rivet head and also to allow the chuck jaws to be oiled without disassembly.
  • a hollow cylindrical tension piece 4 Inside the steel sleeve 3 and coaxially to it is a hollow cylindrical tension piece 4, the outer diameter of which is significantly smaller than the inner diameter of the sleeve 3 and which extends far into the housing part 1 (approximately to half its length).
  • the tension piece 4 carries the chuck housing 5 with the chuck jaws 6 for gripping the pulling mandrel of a blind rivet to be riveted.
  • the pull piece 4 is guided several times tightly; So behind the connection point between the housing part 1 and the sleeve 3 is a wiping ring 7 which bears against the housing wall with its outer diameter and which has an annular groove in its inner surface which receives an O-ring 8 which lies sealingly on the tension member 4.
  • annular pulling piston 15 is formed in one piece with the pulling piece 4 or is fixedly connected, preferably screwed, the outer surface of which is sealed against the housing wall 1 by means of a piston seal (groove ring) 17.
  • a piston seal groove ring
  • the pulling piston 15 rests with its one annular surface on the casing ring 12.
  • An annular piston 18 is secured behind the scraper ring 7 on the hollow cylindrical tension piece 4 with the aid of a retaining ring 19.
  • the outer diameter of this annular piston 18 is significantly smaller than the inner diameter of the housing part 1 surrounding it, and it is approximately equal to the inner diameter of the cylinder sleeve 9.
  • a recess 20 in the inner surface of the annular piston 18 creates an annular space 20 which surrounds the pulling element 4 and which is characterized by an or a plurality of bores 21 in the cylinder wall of the tension member 4 is connected to the interior thereof and, in addition, in the embodiment of the device (FIGS. 1a and b) is also connected to the interior of the housing part 1 surrounding the annular piston 18 through recesses not visible in the drawing.
  • An O-ring 22 is located in a groove in the lateral surface of the annular piston 18.
  • the annular piston 18 moves into the cylinder sleeve 9 during an actuation stroke of the pulling element 4, the O-ring 22 then sealing bears against the inner wall of the cylinder sleeve 9 and tightly separates the annular spaces lying inside the cylinder sleeve 9 in front of and behind the annular piston 18.
  • a pressure bushing 23 at the end facing the mouthpiece 2, the pressure ring bushing 23 resting with its front ring edge on the chuck jaws 6.
  • the pressure bushing 23 is guided at least over part of its length on the side facing the mouthpiece 2 within the pulling element 4 by means of a sliding fit.
  • a nozzle tube 24 On the annular surface of the pressure bush 23 facing away from the mouthpiece 2, there is a nozzle tube 24, the outer diameter of which is significantly smaller than the inner diameter of the pulling element 4, with a flange 25 formed at one end and projects with its other end into the interior of a pressure tube 26 with play , which slidably protrudes from the side facing away from the mouthpiece 2 into the pull piece 4 on its inner surface.
  • the nozzle tube 24 protruding into the pressure tube 26 is widened at its outer end in the direction of the inner surface of the pressure tube 26 and forms a fine nozzle 27 for the passage of air at this point, as will be described in more detail below.
  • a compression spring 28 Arranged around the nozzle tube 24 is a compression spring 28, which is supported on the one hand on a spacer ring 29 arranged behind the flange 25 of the nozzle tube 24 and on the other hand on the ring surface of the pressure tube 26 projecting into the pull piece 4, thereby sealing the flange 25 of the nozzle tube 24 presses the annular surface of the pressure bush 23.
  • the pressure pipe 26 protrudes through a central opening in the end cover 30 (designed as an end screw) of the housing part 1 into a collecting container 31 fastened to the housing part 1.
  • the pressure pipe 26 In the end cover 30 and in the collecting container 31, the pressure pipe 26 is through a into the central opening the cover 30 inserted grommet 32 guided sealing.
  • a sealing ring 33 between the wall of the housing part 1 and the end cover 30 ensures a tight closure of the interior of the housing to the outside.
  • the working piston of the actuating device for the rental process and the tearing of the rivet mandrel is divided into a piston arrangement, which exists, in comparison with that in a prior art blind riveting device (working piston 5 according to DE-PS 2 419 190) from an annular return piston 34, the pull piston 15 with the pull piece 4 and the pressure tube 26.
  • working piston 5 according to DE-PS 2 419 190
  • the pressure tube 26 and the reset piston 34 can be moved in the direction of the end cover 30 when the blind riveting tool is not connected to the compressed air source are while the traction piston 15 remains in position with the traction element 4, ie do not perform any lifting movement.
  • the collecting container 31 consists of a plastic cup 95 which widens slightly conically from the housing part 1 and over which an equally conically shaped plastic sleeve 96 is pushed.
  • the cup 95 and the sleeve 96 each have at least one window-like opening 97 on their circumference. By mutually rotating the cup 95 and the sleeve 96, these openings 97 can be closed or made to coincide in order to be able to empty the collecting container 31.
  • the bottom of the plastic cup 95 is cut out in a circle, and the remaining bottom ring 98 and an undercut in the inside wall of the cup hold a baffle plate 101, preferably made of sheet steel, provided with small air outlet openings 100, against which the pulling mandrels flung into the collecting container 31 collide.
  • the air outlet openings 100 are preferably provided on a circular line or an annular region.
  • the collecting container 31 can be firmly connected, preferably screwed, to the housing part 1.
  • the plastic cup 95 has an undercut 99 at its open end or to be connected to the housing part 1, behind which an annular flange 102 of the end cover 30 engages.
  • the cup 95 together with the sleeve 96 fits into a step 103 provided on the housing part 1.
  • the collecting container 31 is then screwed to the housing part 1 via the end cover 30.
  • Below the end cover 30 is against a shoulder of the outer wall of the pressure tube 26, preferably fixed there or in a recess in the same, the return piston 34, which is sealed against the housing wall 1 by a groove ring 36.
  • the return piston 34 is acted upon by compressed air from its rear side and is in the advanced state in contact with the pull piston 15.
  • the gap 40 widens at the joint between the handle B and the device head A on the side facing the collecting container 31 to a cavity 45, which is sealed to the outside by a flat seal 46 at the joint between the handle B and the device head A and through a bore 47 in the wall of the device head A has a connection with an annular space 48 formed by a recess between the end cover 30 and the housing wall 1 or between the end cover 30 and the return piston 34.
  • the extension 39 there is a cylindrical bore in the exemplary embodiment, which forms the hydraulic chamber 49, which has a throttle check valve 50 arranged on its bottom and a bore 51 with the annular hydraulic chamber 52 between the casing ring 12 and the tension piston 15 in the housing part 1 connection .
  • a refill hole for the hydraulic chamber 52 is provided in the housing wall 1, which is sealed by a refill screw 53 and with the help of a sealing ring 54. Hydraulic medium can be refilled easily through this refill hole if the refill screw 53 has to be removed if necessary, without complicated assembly work.
  • the throttle check valve 50 on the bottom of the hydraulic chamber 49 consists essentially of a cylindrical valve body 55 which is sealed on its outer surface by a sealing ring 56 against the wall of the hydraulic chamber 49 and a passage opening 57 for the bore 51 in the housing wall in connection therewith Has hydraulic medium.
  • a throttle disc 58 with a very small passage or throttle opening 59 is inserted and secured against falling out by a retaining ring 60 inserted into a groove in the cylindrical recess.
  • the throttle disc 58 closes the passage opening 57 in the valve body 55 except for the small throttle opening 59.
  • the backflow of the hydraulic medium takes place unthrottled via a recess 61 on the circumference of the throttle disc 58.
  • the cylinder pot 64 of the pneumatic part C of the drive system is connected to the flange 62 of the handle B facing away from the device head A by means of eight long screws 63.
  • the cylinder pot 64 is preferably made of several pieces and is advantageously also made of plastic.
  • the screws 63 are arranged so that they are not visible and the screw heads are sunk into a base plate 104, which is placed against the bottom of the cylinder pot and is designed as a metal plate, and are covered by a rubber strip 65 running around the bottom of the cylinder pot.
  • the device can advantageously be placed upright on the bottom of the cylinder pot or the rubber stand 65.
  • a central opening is provided in the bottom of the cylinder pot and in the bottom plate 104, which is in contact with it from the outside, in which a compensation piston 66, which is open on both sides and closes with the bottom of the cylinder pot, is tightly fastened, and through the entire cylinder pot 64 into the flange part 62 of the handle B protrudes.
  • the compensating piston 66 is screwed from the outside to the cylinder pot base and the base plate 104 by a hollow screw 105.
  • annular pneumatic pressure piston 67 Arranged in the cylinder pot 64 is an annular pneumatic pressure piston 67, which is sealed on its outer circumference by means of an O-ring 68 inserted in a circumferential annular groove, and the inside diameter of which is larger than the outside diameter of the compensating piston 66.Coaxial to the compensating piston 66 and the pressure piston 67 is firmly connected to the latter, a hollow plunger 69, which projects with its closed, free end through the central opening of the sealing ring holder 41 into the hydraulic chamber 49 filled with hydraulic medium.
  • the hydraulic chamber 49 is through a rod seal 70 between the sealing ring socket 41 and the plunger 69 against the pneumatic cylinder cup 64 and through the already mentioned sealing ring 44 between the outer wall of the housing extension 39 and the sealing ring socket 41 screwed onto this against the intermediate space 40 between the housing extension 39 and the handle B sealed.
  • a guide ring 72 for the plunger 69 is arranged between the rod seal 70 and a radially inwardly projecting extension 71 of the sealing ring holder 41.
  • the wall of the compensating piston 66 which projects into the hollow plunger 69 while maintaining a radial space, is reinforced at its free end almost to the inside diameter of the plunger 69, and a sealing ring 74 placed in an annular groove of this reinforcement lies sealingly against the inner wall of the plunger 69 .
  • the open end of the plunger 69 connected to the annular pneumatic pressure piston 67 is inserted into the central opening of the pressure piston 67.
  • a 4/2-way pneumatic valve 77 which is indicated by a dashed circular line in FIG. 1a and b as well as FIGS. 2a and b and preferably has a negative control, is accommodated transversely and consists of a control cylinder and a control slide.
  • the input connection of the 4/2-way valve 77 is connected to a compressed air hose 82 which is attached to the outside of the flange 62 by means of a connecting sleeve and a connecting sleeve 81 and which does not show in FIGS. 1a and b and in FIGS. 2a and b, but in 3a and 3b indicated compressed air source Q leads, connected;
  • the space 40 which is always pressurized with compressed air when the device is connected to the compressed air source, has a connection with the pneumatic line between the handle B and the surrounding housing extension 39 and from there via the bore 47 to that between the end cover 30 and the return piston 34 annular space 48 located in the device head.
  • the two other connections of the 4/2-way valve 77 are each connected to one of the pneumatic chambers located in the cylinder head 64 in the actuating direction of the pressure piston 67 in front of or behind the latter.
  • the fourth connection of the 4/2-way valve 77 represents a connection to the atmosphere.
  • the pneumatic chamber 83 lying in front of the pressure piston 67 in the actuating direction of the pressure piston 67, that is to say partially closed by the flange 62 of the handle piece B, is via a bore 84 in the handle piece B.
  • connection of the 4/2-way valve 77 to the pneumatic chamber 88 located behind the pressure piston 67, that is to say delimited by the bottom of the cylinder pot 64, is established by a channel tube 80 projecting longitudinally through the cylinder pot 64 and penetrating the pressure piston 67 r Piercing opening of the pressure piston 67 encircling annular groove receives a sealing ring 89 sealing against the outer surface of the sewer pipe, so that the pressure piston 67 is tightly guided on the sewer pipe 80 during its movement.
  • the two pneumatic chambers 83 and 88 are connected to one another, and the intermediate space 40 is connected to the compressed air connection 82.
  • the actuating valve 91 designed as a 2/2-way valve switches the 4/2-way valve 77 via a corresponding control line 76, and the pneumatic chambers 83 and 88 thereby become separated from one another, and the pneumatic chamber 88 located behind the pressure piston 67 is connected to the compressed air connection 82.
  • the space 40 always remains connected to the compressed air connection 82.
  • a pressure relief valve 92 is arranged in the flange part 62 of the handle B, which can establish a connection in front of the intermediate space 40 to the pneumatic chamber 83 located in front of the pressure piston 67 via a bore 109.
  • the pressure relief valve 92 is adjustable from the outside by an adjusting screw 92 '; if necessary, a precisely metered permanent connection between the intermediate space 40 and the front pneumatic chamber 83 can also be established.
  • the hand guard 106 is provided below the handle B, which extends in an arched manner from the front part of the device head A to the flange part 62 of the handle B and is fastened there in each case.
  • the hand guard 106 is also made of plastic and has at its other end a connection eyelet 107, which comprises the housing part 1 and rests on a step 108 of the steel sleeve 3 at its abutment with the housing part 1.
  • plastic for various components of the device such.
  • plastic for various components has the particular advantage that they can be manufactured as plastic molded parts by injection molding, which can be assembled without post-processing.
  • these plastic parts can be colored as external parts in a desired color during manufacture, so that the device does not have to be painted.
  • the plastic used is preferably a glass fiber reinforced plastic of one of the polyamides.
  • the mandrel of a blind rivet to be riveted is now inserted through the mouthpiece 2 into the chuck mechanism 5, 6.
  • the working stroke (advance) of the blind riveting device is triggered, which is why reference is also made to FIG. 3b.
  • the valve body of the actuating valve 91 which is designed as a 2/2-way valve, is lifted from its seat by depressing the control button 90, and the 4/2-way valve 77 is reversed into its actuating position via the control line 76 by a pneumatic negative control.
  • the two pneumatic chambers 83 and 88 are pneumatically separated from each other in the cylinder pot 64 and the sewer pipe 80 is connected to the compressed air connection.
  • Compressed air thus flows through the duct pipe 80 into the pneumatic chamber 88 located behind the pressure piston 67 and acts on the surface F1 below (on the rear) of the pressure piston 67 and moves it together with the plunger 69 firmly connected to it in the direction of arrow P in FIG. 2a.
  • the plunger 69 is guided tightly on the reinforced free end of the compensating piston 66; at the same time, the compensation piston 66, which is open at the bottom of the cylinder pot, ensures pressure compensation in the interior, which is widened by the movement of the tachometer piston 69 and is determined by plunger piston 69 and compensation piston 66.
  • the plunger 69 penetrates into the hydraulic chamber 49 filled with hydraulic medium.
  • the throttle disk 58 of the throttle check valve 50 is brought into contact with its seat on the valve body 55 by hydraulic action, and this displaced during the further movement of the pressure piston 67 and plunger 69 as far as the stop on the flange 62 Hydraulic medium grossed throttled through the small oil 59 of the throttle plate 58, the passage bore 57 of the throttle valve body 55 and the GoHousbohrung 51 in the hydraulic chamber 52 dos housing part 1 and acts there on the annular surface of the pull piston 15 in the pulling direction.
  • the chuck mechanism 5, 6 carrying pull piece 4 and also the restoring piston 34 resting thereon with the pressure tube 26 against the pneumatic force acting on the restoring piston 34 are moved in the pulling direction by the stroke required for the riveting process (approximately 22 mm); the compressed air previously introduced into the space between the end cover 30 and the return piston 34 is thereby displaced.
  • the pulling mandrel of the blind rivet gripped by the chuck mechanism 5, 6 is torn off at its predetermined breaking point, forming the riveting point.
  • the annular piston 18 attached to its periphery also enters the inside of the cylinder sleeve 9 and lies sealingly against its inner surface.
  • FIGS. 2a and b This intermediate position of the blind riveting tool after the riveting process has just been carried out is shown in FIGS. 2a and b.
  • the 4/2-way valve 77 switches back to its starting position, again establishing a connection between the two pneumatic chambers 83 and 88 of the cylinder pot 64 is produced, and the return of the blind riveting device to its starting or standby position, shown schematically in FIG. 3a, begins.
  • the compressed air previously introduced into the rear pneumatic chamber 88 now also reaches the front pneumatic chamber 83 and from there via the bores 84, 84 'and the puncture 86 in the cylinder sleeve 9 into the during the pulling movement between the shoulder 10 of the cylinder sleeve 9 and the annular piston 18 created, sealed annular space 93.
  • the annular piston 18 is arranged with its annular surface F4 pressurized by compressed air.
  • the compressed air from the previous riveting process is in the switching position described above, in which the cylinder spaces 83, 87 and 88 are connected, at the two ring surfaces F1 'and F1 of the pressure piston 67 and the ring surface F4 of the ring piston 18 at the same time.
  • compressed air is always seen on the return piston 34 with its annular surface F3 'via lines 82, 40, 45 and 47, while on the other hand the hydraulic medium acts against the annular surface F3 of the tension piston 15.
  • the ring surfaces F1 ', F1, F2, F3, F3' and F4 are preferably flat surfaces.
  • the escaping compressed air creates a suction directed in the direction of the collecting container 31, which sucks off the mandrel released by the chuck jaws 6 and conveys it into the collecting container 31.
  • the tension piece 4, the pressure bush 23, the nozzle tube 24 and the pressure tube 26, which are arranged coaxially to one another and one behind the other in the device head A, thereby form the passage 94 for the torn mandrel which is continuous from the chuck mechanism 5, 6 to the collecting container 31.
  • the compressed air supplied via the hose connection is sufficient as a result of the metered Adjustment of the pressure relief valve 92 in order, on the one hand, as described above, to hold the return piston 34 in the advanced position in contact with the pulling piston 15 and thus the blind riveting tool in the ready position, and on the other hand through the outlet from the nozzle 27 via the above-mentioned path in the passage 94 and thus to generate a negative pressure on the mouthpiece 2, which holds the blind rivet inserted into the mouthpiece 2 in place, but then a constant, however h Limited compressed air supply is required.
  • the blind riveting device according to the invention can thus be converted by a simple measure - turning the adjusting screw 92 '- from a device with intermittent compressed air supply, in which the inserted blind rivets are not held in the mouthpiece 2 by negative pressure, into a device with a constant, but in comparison compressed air supply reduced to the prior art, in which the blind rivets are held in the mouthpiece 2 by negative pressure.
  • the blind riveting device according to the invention can be further transformed in an advantageous manner. Under certain conditions, e.g. B. for space reasons, ejection of the mandrels to the rear can be undesirable and even impossible.
  • the blind riveting device can then be quickly and easily into a device with ejection of the mandrels forward, i. H. through the mouthpiece 2.
  • the steel sleeve 3 with the pressure bush 23 and the chuck mechanism 5 is unscrewed from the device head A and the nozzle tube 24 is removed to the front by the pulling element 4.
  • an automatic suction or ejection device for the mandrel torn off during the riveting process into the actual blind riveting device in a space-saving manner.
  • the compressed air is used twice in an energy-saving manner, namely for the actual riveting process and for the suction or ejection of the mandrel.
  • the riveting process and the suction or ejection process can take place in succession in a closed work cycle, and the blind riveting device is then immediately ready for use again.
  • the blind riveting device according to the invention can be converted in a simple and quick manner, depending on the need, from the preferred suctioning off of the torn mandrels backwards to their forward ejection. Both systems are therefore combined in one and the same blind riveting tool.
  • the only intermittent supply of compressed air saves energy and costs.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Actuator (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Earth Drilling (AREA)
  • Forging (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Tents Or Canopies (AREA)
  • Compressor (AREA)

Claims (18)

1. Apparail oléo-pneumatique de rivetage, servant à la pose de rivets borgnes constitués par une douille de rivet et un clou de traction susceptible d'être arranché, et comportant un vérin pneumatique (64), dans lequel un piston de refoulement (67) et un piston plongeur (69), qui est relié rigidement à ce dernier et s'enfonce de façon étanche dans une chambre hydraulique contigüe (49), peuvent être déplacés selon un mouvement de va-et-vient, et une tête (A) raccordée à la chambre hydraulique (49) et dans laquelle un dispositif de traction (4, 15) portant le mécanisme du mandrin (5, 6) servant à saisir le clou de traction, peut être déplacé suivant un mouvement de va-et-vient sous l'action d'une commande oléo-pneumatique, un conduit de passage (94) étant prévu dans la tête (A) de l'appareil pour l'éjection vers l'arrière des clous de traction arrachés lors de l'opération de rivetage, caractérisé en ce qu'en réponse au changement de position d'une soupape (77), l'air comprimé introduit, pour l'exécution d'une opération de rivetage, dans la chambre pneumatique (88) située en arrière du piston de refoulement (67), peut, une fois l'opération de rivetage complètement effectuée, être, introduit suivant la direction d'éjection dans le conduit de passage (94), à travers des perçages (84, 84', 21) prévus dans l'appareil de rivetage.
2. Appareil de rivetage selon la revendication 1, caractérisé en ce que l'air comprimé peut être indroduit suivant la direction d'éjection dans le conduit de passage (94), à travers une buse (27) située en arrière du clou de traction.
3. Appareil de rivetage selon la revendication 1 ou 2, caractérisé en ce qu'une buse tubulaire (24), qui laisse subsister un interstice par rapport à la paroi intérieure du conduit de passage (94) et dont l'extrémité, tournée à l'opposé du mécanisme du mandrin (5, 6), s'élargit radialement en direction de la paroi du conduit de passage (94), est disposée de façon concetrique dans le conduit de passage (94) et forme ainsi une ou la buse (27), l'air comprimé pouvant être introduit, à travers un perçage (21) ménagé dans la paroi du conduit de passage (94), dans l'interstice formé entre la paroi intérieure du conduit de passage (94) et la buse tubulaire (24).
4. Appareil de rivetage selon l'une des revendications 1 à 3, caractérisé en ce que le conduit de passage (94) est formé par un élément de traction (4) en forme de cylindre creux, disposé coaxialement dans la tête (A) de l'appareil et qui porte, sur l'une de ses extrémités, le mécanisme du mandrin (5, 6) et, sur son autre extrémité, un piston de traction (15) pouvant être déplacé d'une manière étanche dans la tête (A) de l'appareil, ainsi que par un tube de pression (26) qui est inséré dans l'élément de traction (4) du côté du piston de traction (15) et qui traverse le capot de fermeture (30) de la tête (A) de l'appareil.
5. Appareil de rivetage selon la revendication 4, caractérisé ce que la buse tubulaire (24) prend appui, de manière étanche, par l'une de ses extrémités, sur une douille de pression (23) disposée à l'intérieur de l'élément de traction (4) et s'appuyant sur les mors (6) du mécanisme du mandrin, et pénètre, par son extrémité élargie constituant la buse (27), dans le tube pression (26), un ressort de pression (28) entourant la buse tubulaire (24) étant disposé entre la douille de pression (23) et le tube de pression (26).
6. Appareil de rivetage selon l'une des revendications 1 à 5, caractérisé en ce qu'au piston de traction (15), est associé un autre piston (piston de rappel 34), à l'aide duquel le ressort de pression (28) peut être détendu.
7. Appareil de rivetage selon l'une des revendications 4 à 6, caractérisé en ce que l'élément de traction (4) est entouré, au-dessous du piston de traction (15), par un manchon cylindrique (9) qui comporte, sur son extrémité tournée vers le piston de traction (15), un épaulement (10) dirigé radialement vers l'intérieur et contre lequel l'élément de traction (4) peut être déplacé d'une manière étanche, et laisse subsister par ailleurs, par rapport à l'élément de traction (4), un espace annulaire (87) dans lequel débouche le perçage (84') du carter pour l'admission de l'air comprimé, et en ce que, dans la zone du perçage (21) ménagé dans l'élément de traction (4), ce dernier est entouré, en vue de la transmission de l'air comprimé à la buse (27), par un piston annulaire (18) qui, lorsque l'élémment de traction (4) est dans la position initiale, est situé à l'extérieur du manchon cylindrique (9) et établit, à l'aide d'évidements (20), une communication entre l'espace l'enrourant et le perçage (21) ménagé dans l'élément de traction, et qui, lorsque l'élément de traction (4) est à l'état rétnacté, est situé à l'intérieur du manchon cylindrique (9) et applique le perçage (21) contre la paroi du manchon cylindrique (9), en réalisant une étanchéité vis-à-vis de l'espace environnant.
8. Appareil de rivetage selon la revendication 7, caractérisé en ce que le perçage (84') du carter débouche, par l'intermédiaire d'un perçage (86) ménagé dans le manchon cylindrique (9), dans l'espace annulaire (93) formé entre l'épaulement (10) du manchon cylindrique (9) et le piston annulaire (18), lorsque l'élément de traction (4) est à l'état rétracté.
9. Appareil de rivetage selon l'une des revendications précédentes, caractérisé en ce que le conduit de passage (94) débouche dans un bol de récupération (31) monté sur la tête (A) de l'appareil et placé en communication avec l'atmosphère.
10. Appareil de rivetage selon l'une des revendications 3 à 9, caractérisé en ce qu'après dévissage d'une douille (3) maintenant l'embouchure (2) et le mécanisme du mandrin (5, 6) et pouvant être vissée sur la tête (A) de l'appareil, la buse tubulaire (24) peut être retirée vers l'avant à travers l'élément de traction (4) et l'appareil de rivetage peut être actionné sans la buse tubulaire (24), avec éjection des clous de traction à travers l'embouchure (2).
11. Appareil de rivetage selon l'une des revendications 1 à 9, caractérisé en ce que le bol de récupération (31), dans lequel débouche le conduit de passage (94), peut être relié rigidement à la tête (A) de l'appareil.
12. Appareil de rivetage selon la revendication 11, caractérisé en ce que le bol de récupération (31) est constitué par un pot (95) muni d'un manchon de forme adaptée (96) emmanché sur ce dernier, le pot et le manchon comportant tous deux dans leur paroi au moins une ouverture (97) en forme de fenêtre, ces ouvertures pouvant être fermées ou amenées en recouvrement par rotation du manchon (96) par rapport au pot (95).
13. Appareil de rivetage selon la revendication 11 ou 12, caractérisé en ce que le bol de récupération (31) comporte dans son fond des ouvertures de sortie d'air (100).
14. Appareil de rivetage selon la revendication 13, caractérisé en ce que le bol de récupération (31) est réalisé en matière plastique et en ce que son fond est découpé selon une forme circulaire et une tôle d'arrêt (101) comportant des ouvertures de sortie d'air (100) est maintenue par l'anneau de fond substitant (98).
15. Appareil de rivetage selon l'une des revendications 1 à 9, caractérisé en ce qu'une suopape de surpression réglable (92) est disposée dans la liaison pneumatique entre le raccord d'air comprimé (82) et le conduit de passage (94).
16. Appareil de rivetage selon l'une des revendications 1 à 15, caractérisé en ce que les aires des surfaces annulaires au-dessus (F1') et au-dessous (F1) du piston de refoulement (67) sont rendues proches l'une de d'autre jusqu'à prendre des valeurs approximativement égales.
17. Appareil de rivetage selon la revendication 16, caractérisé en ce que le rapprochement des aires des surfaces annulaires au-dessus (F1') et au-dessous (F1) du piston de refoulement (67) est obtenu à l'aide d'un piston de compensation (66).
18. Appareil de rivetage selon la revendication 17, caractérisé en ce que le piston de compensation (66), d'une part, est fixé sur le fond du pot cylindrique et, d'autre part, pénètre dans le piston plongeur (69), coaxialement à ce dernier (69), jusque dans la zone de la bride (62), tournée à l'opposé de la tête (A) de l'appareil, de la poignée (B).
EP82102325A 1981-03-31 1982-03-20 Dispositif pneumatique-hydraulique pour la pose de rivets aveugles Expired EP0062206B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82102325T ATE13825T1 (de) 1981-03-31 1982-03-20 Pneumatisch-hydraulisches blindnietgeraet.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3112711 1981-03-31
DE3112711A DE3112711C2 (de) 1981-03-31 1981-03-31 Pneumatisch-hydraulisches Blindnietgerät

Publications (3)

Publication Number Publication Date
EP0062206A2 EP0062206A2 (fr) 1982-10-13
EP0062206A3 EP0062206A3 (en) 1983-07-06
EP0062206B1 true EP0062206B1 (fr) 1985-06-19

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ID=6128807

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Application Number Title Priority Date Filing Date
EP82102325A Expired EP0062206B1 (fr) 1981-03-31 1982-03-20 Dispositif pneumatique-hydraulique pour la pose de rivets aveugles

Country Status (6)

Country Link
US (1) US4515005A (fr)
EP (1) EP0062206B1 (fr)
JP (1) JPS57175042A (fr)
AT (1) ATE13825T1 (fr)
DE (1) DE3112711C2 (fr)
ES (1) ES511022A0 (fr)

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Also Published As

Publication number Publication date
EP0062206A3 (en) 1983-07-06
JPS57175042A (en) 1982-10-27
ES8301701A1 (es) 1983-02-01
ES511022A0 (es) 1983-02-01
ATE13825T1 (de) 1985-07-15
DE3112711A1 (de) 1982-10-14
JPH0255136B2 (fr) 1990-11-26
EP0062206A2 (fr) 1982-10-13
DE3112711C2 (de) 1984-11-08
US4515005A (en) 1985-05-07

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