WO1993004833A2 - Welding appliance for cross-welding liquid-filled plastic tubing - Google Patents

Welding appliance for cross-welding liquid-filled plastic tubing Download PDF

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Publication number
WO1993004833A2
WO1993004833A2 PCT/EP1992/001967 EP9201967W WO9304833A2 WO 1993004833 A2 WO1993004833 A2 WO 1993004833A2 EP 9201967 W EP9201967 W EP 9201967W WO 9304833 A2 WO9304833 A2 WO 9304833A2
Authority
WO
WIPO (PCT)
Prior art keywords
welding
hose
welding device
press jaw
receptacle
Prior art date
Application number
PCT/EP1992/001967
Other languages
German (de)
French (fr)
Other versions
WO1993004833A3 (en
Inventor
Peter Eilsberger
Original Assignee
Eilsberger Elektronik 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
Priority claimed from DE19914128814 external-priority patent/DE4128814A1/en
Application filed by Eilsberger Elektronik Gmbh filed Critical Eilsberger Elektronik Gmbh
Priority to EP92918478A priority Critical patent/EP0601026A1/en
Publication of WO1993004833A2 publication Critical patent/WO1993004833A2/en
Publication of WO1993004833A3 publication Critical patent/WO1993004833A3/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
    • B65B9/12—Subdividing filled tubes to form two or more packages by sealing or securing involving displacement of contents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/04—Dielectric heating, e.g. high-frequency welding, i.e. radio frequency welding of plastic materials having dielectric properties, e.g. PVC
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/431—Joining the articles to themselves
    • B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
    • B29C66/7373—Joining soiled or oxidised materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8122—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the composition of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8145—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81463—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a plurality of single pressing elements, e.g. a plurality of sonotrodes, or comprising a plurality of single counter-pressing elements, e.g. a plurality of anvils, said plurality of said single elements being suitable for making a single joint
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/816—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8161—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps said pressing elements being supported or backed-up by springs or by resilient material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/816—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8169—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps the mounting of said pressing elements being laterally movable, e.g. adjustable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/841—Machines or tools adaptable for making articles of different dimensions or shapes or for making joints of different dimensions
    • B29C66/8412—Machines or tools adaptable for making articles of different dimensions or shapes or for making joints of different dimensions of different length, width or height
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/843—Machines for making separate joints at the same time in different planes; Machines for making separate joints at the same time mounted in parallel or in series
    • B29C66/8432—Machines for making separate joints at the same time mounted in parallel or in series
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/861—Hand-held tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/743—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/753—Medical equipment; Accessories therefor

Definitions

  • the invention relates to a welding device for cross-welding liquid-filled plastic hoses with a hose receptacle, a crimping device for the hose with a displaceable press jaw and a welding device with an electrode mounted in the displaceable press jaw.
  • welding is carried out by means of an HV voltage which is generated in a separate HF amplifier. It was found here that radio-frequency interference radiation in the area of the hose receptacle emerges unhindered into the atmosphere.
  • the object of the invention is therefore to develop a welding device of the type mentioned at the outset in such a way that the emission of radio-frequency interference beams in the region of the hose receptacle is prevented.
  • the shielding device according to the invention is advantageously attached to the movable press jaw. This will make the Shielding device moved together with the press jaw before the actual welding process.
  • the shielding device is designed in such a way that the hose receptacle is almost completely shielded by the shielding device in the welding position.
  • a centering for the hose is arranged on the shielding device, so that the hose is always in the optimal welding position in the hose holder before the welding process.
  • a further preferred embodiment of the invention consists in that a covering device for the electrode mounted in the press jaw is arranged in the area of the hose receptacle. This prevents any moisture escaping from the hose from getting into the spaces between the press jaw and the electrode.
  • the cover device also enables easy cleaning of the electrode and the press jaw in the area of the hose holder.
  • the covering device is designed as a non-conductive film, in particular silicone film. It is very useful here that the film is stretched over the electrode and the press jaw and attached to the press jaw.
  • a further embodiment of the invention consists in the fact that a sealing device for liquids is arranged in the region of the displaceable press jaw. This prevents the hose escaping liquid, which has collected on the bottom of the hose receptacle, can reach the rear region of the welding device, that is to say the region of the hose receptacle which is arranged in the opposite direction as seen from the pressing jaw.
  • the sealing device has a rear base plate on which the press jaw is arranged, a gap which lies between the hose receptacle and the rear base plate and is arranged lower than the upper edge of the rear base plate, and approximately at height of the gap lying outflow opening. Due to the height offset of the gap and the rear base plate, the liquid does not reach the upper edge of the rear base plate when the welding machine is operated horizontally, which may be a passage for the liquid, but can flow out in good time through the outlet opening. It is very advantageous here that the gap is formed by an apron which is arranged on the press jaw and points towards a front base plate. This results in a narrow gap width, so that the electromagnetic shielding of the hose holder is not impaired.
  • a variant of the invention is that in a welding device designed as a table device, at least two, preferably six, welding devices are arranged next to one another in the hose direction.
  • hoses can be divided into segments and thermally welded, the number of segments being able to be different.
  • the length of the individual segments can also be adjusted simultaneously with this welding machine. This in turn is particularly advantageous in the case of blood bag tubes, since here, depending on the manufacturer, the segments that have already been numbered can have different lengths.
  • the processing time is reduced accordingly, depending on the number of welding devices arranged side by side.
  • Another embodiment of the invention provides that a scissor-telescopic support for the welding devices with an adjusting device for the distance between the individual welding devices is provided for displacement. This makes it easy to set the distances between the individual welding devices.
  • a particularly preferred embodiment of the invention is that a hose tensioning device is provided. This results in a higher level of safety when welding, because the tensioned hose can no longer become tangled or accidentally get into the hose holder with several turns. It is very advantageous that the hose tensioning device has a welding device, which is assigned to one end of the carrier and has a limit switch fixedly arranged in the region of the hose holder, and a hose clamp assigned to the other end of the carrier, the hose clamp having a corrugated hose clamp holder. Due to the wave-shaped design of the hose clamp receptacle, the inserted hose is compressed when the Hose clamp slightly tensioned without being pinched. So that the clamping effect is achieved, the diameter of the hose clamp receptacle is slightly smaller than the diameter of the hose to be tensioned.
  • the drawing shows an embodiment of the invention. Here represent:
  • FIG. 2 shows a longitudinal section
  • FIG. 3 shows a top view of a multiple arrangement
  • FIG. 4 shows a top view of a hose clamp
  • FIG. 5 shows a cross section of the hose clamp according to FIG.
  • FIG. 6 is a partial view according to FIG. 1,
  • FIG. 7 shows a partial view according to FIG. 2.
  • the welding device 1 consists of a housing 16 and a carrier 18.
  • a pressing jaw 7 is on the carrier 18. and a counter electrode 8 is attached.
  • a press jaw 3 is slidably supported against the pressure of a spring 5 in a jaw guide 6 which is arranged on the carrier 18.
  • a shielding device 21, which surrounds the press jaw 3 from three sides, is attached to the press jaw 3.
  • a hose centering 22 is arranged on the shielding device 21.
  • In the press jaw 3 is an electrode 2 biased by a spring 4 slidably mounted.
  • a hose receptacle 15 is provided in the housing 16 and is laterally delimited by the press jaws 3 and 7.
  • An actuating lever 9 is articulated on the carrier 18 and is operatively connected to the pressing jaw 3 and the electrode 2 via a slide 10.
  • a pin 11 is provided on the slide 10 and a recess 12 assigned to the pin 11 is provided on the actuating lever 9, the pin 11 engaging in the recess 12 in the installed state - as shown in FIG. 2.
  • a cutting edge 19 is arranged on the electrode 8.
  • the electrode 2 is connected to an RF voltage via a choke coil 13, a switch 14 and a coaxial cable (not shown). The switching function of the switch 14 is triggered by the actuating lever 9 when it is fully pressed.
  • the RF voltage and its control is generated in a separate RF amplifier.
  • a cover device 23 designed as a silicone film is stretched from the front over the electrode 2 and the press jaw 3 and fastened to the side of the press jaw 3.
  • the silicone film prevents both the penetration of moisture into the spaces between the press jaw 3 and the electrode 2 and also a jump of sparks from the electrode 2 to the counter electrode 8, which can occur during the welding process due to the HF in connection with moisture.
  • the hose receptacle 15 is closed at the bottom by a front base plate 24.
  • a rear base plate 25, on which the jaw guide 6 is fastened, is arranged on this in the region of the press jaw 3.
  • the cheek plate 3 has on its directed towards the tubular receptacle 15 to a side pointing toward the front bottom plate 24 skirt 26, whereby a narrow gap '27 is formed between the apron 26 and the front base plate 24.
  • an outflow opening 28 is arranged approximately at the level of the gap 27.
  • the front base plate 24, the rear base plate 25, the gap 27 and the outflow opening 28 together form a sealing device 29.
  • FIG. 3 shows six welding devices 1 which can be moved next to one another on a carrier 31.
  • Six base plates 32 are arranged on the carrier 31 and a carrier plate 33 is arranged thereon on which a welding device 1 is mounted.
  • the support plate 33 is guided by the guide rail 34, which is connected to a guide support 35 on both sides of the support plate 33.
  • the base plates 32 are connected to one another via articulated arms 36 and articulated arm bearings 37.
  • the articulated arm bearings 37 and the guide supports 35 are connected to one another by guide shafts 38 which are mounted in side plates 39.
  • the spacing between the individual welding devices 1 is adjusted by changing the spacing of the two guide shafts 38 from one another.
  • a spindle 41 provided with a handwheel 40 is provided with the two Guide shafts 38 connected.
  • the spindle 41 pulls or pushes the two guide shafts 38 together or apart, the guide rails 34 and the side plates 39 only permitting the change in one direction. Since the articulated arm bearings 37 are firmly connected to the two guide shafts 38, the distance between two welding devices is changed in the same way when the handwheel 10 is actuated.
  • a hose tensioning device 42 which has a welding device assigned to one end 43 of the carrier 31 with a fixed limit switch 44 and a hose clamp 46 assigned to the other end 45 of the carrier 31.
  • the hose clamp 46 consists of a housing 47, a front clamping part 48 and a rear clamping part 49. Between the two clamping parts 48 and 49 there is a hose support 50 designed as a pin, above which there is a wave-shaped hose clamp receptacle 51.
  • One of the two clamping parts 48 and 49 can optionally be stationary, while the other is moved mechanically by a solenoid valve or a compressed air cylinder.
  • the inserted hose is held at the height necessary for clamping, and thus centered, even when the hose clamp 46 is open.
  • the diameter of the hose clamp receptacle 51 is slightly smaller than the hose to be tensioned, so that when the hose clamp 46 is closed, the hose is slightly tensioned by the wave-shaped design of the hose clamp receptacle 51 without being clamped.
  • the limit switch 44 and a switch 52 arranged on the hose clamp 46 are actuated.
  • the limit switch 44 causes the welding device 1 to be actuated and to pinch the hose.
  • the hose clamp 46 is automatically closed, whereby the hose is slightly tensioned.
  • An electronic logic circuit ensures that the hose is only tensioned when the hose has actuated both limit switches 44, 52 and the first welding device 1 has clamped. After clamping and hose tensioning, the other welding devices always close in ascending order in the direction of the hose clamp so that the liquid in the hose can escape into a blood bag 53.
  • the welding device operates as follows: a welding device not shown in FIGS. 1 and 2, e.g. Blood, filled plastic tube, e.g. PVC is inserted into the weld receptacle 15 provided between the electrodes 2 and 8 in the housing 16.
  • a welding device not shown in FIGS. 1 and 2
  • Blood, filled plastic tube e.g. PVC
  • the pressing jaw 3 By pressing the actuating lever 9 in the counterclockwise direction, the pressing jaw 3, the shielding device 21 attached to it and the electrode 2 are moved in the direction of the pressing jaw 7 and against the electrode 8 by the slide 10 which is operatively connected to the actuating lever 9.
  • the film tube inserted into the tube holder 15 is replaced by the
  • Tube centering 22 pushed into a defined position until the electrode 2 comes into contact with the inserted foil tube.
  • the tube is first compressed between the electrodes 2 and 8 and the Liquid in the hose in the area of the electrodes is pushed away.
  • the press jaw 3 is pushed forward further, the plastic hose is pressed together in a vice-like manner by the press jaws 3 and 7 and the hose receptacle 15 is shielded by the shielding device 21. Due to the pressure surface 20 of the press jaw 7, which increases in the direction transverse to the welding point, the liquid is pressed further away from the welding point.
  • the actuating lever 9 Shortly before its end position, the actuating lever 9 triggers the welding operation via the switch 14, the welding duration being determined by the welding time set.
  • the film tube is separated or provided with a separation point by the cutting edge 18 provided on the counter electrode 8.
  • the actuating lever 9 is relieved and the electrodes 2 and the pressing jaw 3 are pressed back into their basic position by the springs 4 and 5.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

A welding appliance for cross-welding liquid-filled plastic tubing has a tube receptacle (15), a tube squeezing arrangement with a movable pressure clamp (3) and a welding arrangement with an electrode (2). In order to prevent leakage of radio-frequency perturbing radiation in the area of the tube receptacle (15), a shielding device (21) is movably arranged in the area of the tube receptacle (15). In addition, a covering device (23) for the electrode (2) is arranged in the area of the tube receptacle (15) of the welding appliance. The welding appliance may also be designed as a table-type appliance, with several welding appliances movably arranged next to each other in the direction of the tubing.

Description

Schweißgerät zum Querverschweißen von mit Flüssigkeit gefüllten Kunststoffschläuchen Welding machine for cross welding of plastic hoses filled with liquid
Beschreibungdescription
Die Erfindung bezieht sich auf ein Schweißgerät zum Querverschweißen von mit Flüssigkeit gefüllten Kunststoffschlauchen mit einer Schlauchaufnahme, einer Quetscheinrichtung für den Schlauch mit einer verschiebbaren Preßbacke und einer Schweißeinrichtung mit einer in der verschiebbaren Preßbacke gelagerten Elektrode. Bei einem derartigen Schweißgerät wird mittels einer HS-Spannung, die in einem separaten HF-Verstärker erzeugt wird, geschweißt. Hierbei wurde festgestellt, daß radiofrequente Storstrahlen im Bereich der Schlauchaufnahme ungehindert in die Atmosphäre austreten.The invention relates to a welding device for cross-welding liquid-filled plastic hoses with a hose receptacle, a crimping device for the hose with a displaceable press jaw and a welding device with an electrode mounted in the displaceable press jaw. In such a welding device, welding is carried out by means of an HV voltage which is generated in a separate HF amplifier. It was found here that radio-frequency interference radiation in the area of the hose receptacle emerges unhindered into the atmosphere.
Die Aufgabe der Erfindung besteht somit darin, ein Schweißgerät der eingangs genannten Art so weiterzubilden, daß das Austreten von radiofrequenten Störstrahlen im Bereich der Schlauchaufnahme verhindert wird.The object of the invention is therefore to develop a welding device of the type mentioned at the outset in such a way that the emission of radio-frequency interference beams in the region of the hose receptacle is prevented.
Erfindungsgemäß wird diese Aufgabe durch die Merkmale des Anspruchs 1 gelöst.According to the invention, this object is achieved by the features of claim 1.
Hierdurch wird erreicht, daß beim Schweißen keine radiofrequenten Störstrahlen im Bereich der Schlauchaufnahme in die Atmosphäre austreten können. Vorteilhaft ist die erfindungsgemäße Abschirmvorrichtung an der beweglichen Preßbacke befestigt. Dadurch wird die Abschirmvorrichtung vor dem eigentlichen Schweißvorgang mit der Preßbacke zusammen bewegt. Die Abschirmvorrichtung ist so ausgebilde , daß in Schweißstellung die Schlauchaufnahme durch die Abschirmvorrichtung nahezu vollständig abgeschirmt ist. An der Abschirmvorrichtung ist eine Zentrierung für den Schlauch angeordnet, so daß der Schlauch vor dem Schweißvorgang immer in der optimalen Schweißposition in der Schlauchaufnahme liegt.This ensures that no radio-frequency interference radiation can escape into the atmosphere in the area of the hose receptacle during welding. The shielding device according to the invention is advantageously attached to the movable press jaw. This will make the Shielding device moved together with the press jaw before the actual welding process. The shielding device is designed in such a way that the hose receptacle is almost completely shielded by the shielding device in the welding position. A centering for the hose is arranged on the shielding device, so that the hose is always in the optimal welding position in the hose holder before the welding process.
Eine weitere bevorzugte Ausführungsform der Erfindung besteht darin, daß im Bereich der Schlauchaufnahme eine Abdeckvorrichtung für die in der Preßbacke gelagerten Elektrode angeordnet ist. Hierdurch wird verhindert, daß evtl. aus dem Schlauch austretende Feuchtigkeit in die Zwischenräume von der Preßbacke und der Elektrode gelangen kann. Die Abdeckvorrichtung ermöglicht zudem eine leichte Reinigung der Elektrode und der Preßbacke im Bereich der Schlauchaufnahme.A further preferred embodiment of the invention consists in that a covering device for the electrode mounted in the press jaw is arranged in the area of the hose receptacle. This prevents any moisture escaping from the hose from getting into the spaces between the press jaw and the electrode. The cover device also enables easy cleaning of the electrode and the press jaw in the area of the hose holder.
Um weiterhin beim Schweißvorgang ein Funkensprühen von der Elektrode aus in die Schlauchaufnahme hinein zu verhindern, was durch die HF in Verbindung mit Feuchtigkeit auftreten kann, sieht eine weitere Ausgestaltung der Erfindung vor, daß die Abdeckvorrichtung als nichtleitende Folie, insbesondere Silikonfolie, ausgebildet ist. Hierbei ist es sehr zweckmäßig-, daß die Folie über die Elektrode und die Preßbacke gespannt und an der Preßbacke befestigt ist.In order to further prevent sparking from the electrode into the hose receptacle during the welding process, which can occur due to the HF in connection with moisture, a further embodiment of the invention provides that the covering device is designed as a non-conductive film, in particular silicone film. It is very useful here that the film is stretched over the electrode and the press jaw and attached to the press jaw.
Eine weitere Ausführungsform der Erfindung besteht darin, daß im Bereich der verschiebbaren Preßbacke eine Äbdichtvorrich ung für Flüssigkeiten angeordnet ist. Dadurch wird verhindert, daß aus dem Schlauch austretende Flüssigkeit, welche sich auf dem Boden der Schlauchaufnahme gesammelt hat, in den hinteren Bereich des Schweißgeräts, also dem der Schlauchaufnahme, von der Preßbacke aus gesehen, entgegengesetzt angeordneten Bereich, gelangen kann.A further embodiment of the invention consists in the fact that a sealing device for liquids is arranged in the region of the displaceable press jaw. This prevents the hose escaping liquid, which has collected on the bottom of the hose receptacle, can reach the rear region of the welding device, that is to say the region of the hose receptacle which is arranged in the opposite direction as seen from the pressing jaw.
Eine Weiterbildung der Erfindung sieht vor, daß die Abdichtvorrichtung eine hintere Bodenplatte, auf welcher die Preßbacke angeordnet ist, einen Spalt, welcher zwischen der Schlauchaufnahme und der hinteren Bodenplatte liegt und tiefer als die Oberkante der hinteren Bodenplatte angeordnet ist, und eine etwa auf der Höhe des Spaltes liegende Ausflußöffnung aufweist. Durch den Höhenversatz von Spalt und hinterer Bodenplatte gelangt die Flüssigkeit bei waagerechtem Betrieb des Schweißgeräts nicht bis zur Oberkante der hinteren Bodenplatte, was evtl. eine Durchtrittsöffnung für die Flüssigkeit darstellt, sondern kann durch die Ausflußöffnung rechtzeitig abfließen. Hierbei ist es sehr vorteilhaft, daß der Spalt durch eine an der Preßbacke angeordneten, zu einer vorderen Bodenplatte hinweisenden Schürze ausgebildet ist. Dadurch ergibt sich eine schmale Spaltbreite, so daß die elektromagnetische Abschirmung der Schlauchaufnahme nicht beeinträchtigt wird.A further development of the invention provides that the sealing device has a rear base plate on which the press jaw is arranged, a gap which lies between the hose receptacle and the rear base plate and is arranged lower than the upper edge of the rear base plate, and approximately at height of the gap lying outflow opening. Due to the height offset of the gap and the rear base plate, the liquid does not reach the upper edge of the rear base plate when the welding machine is operated horizontally, which may be a passage for the liquid, but can flow out in good time through the outlet opening. It is very advantageous here that the gap is formed by an apron which is arranged on the press jaw and points towards a front base plate. This results in a narrow gap width, so that the electromagnetic shielding of the hose holder is not impaired.
Eine Variante der Erfindung besteht darin, daß bei einem als Tischgerät ausgebildeten Schweißgerät mindestens zwei, vorzugsweise sechs Schweißgeräte in Schlauchrichtung nebeneinander verschiebbar angeordnet sind. Mit einem derartigen Schweißgerät können Schläuche in Segmente aufgeteilt und thermisch verschweißt werden, wobei die Anzahl der Segmente unterschiedlich sein kann. Insbesondere bei Blutbeutelschläuchen werden in der Regel zur Durchführung späterer Kreuzproben fünf Segmente benötigt. Weiterhin kann mit diesem Schweißgerät auch die Länge der einzelnen Segmente gleichzeitig verstellt werden. Dies ist wiederum insbesondere bei Blutbeutelschläuchen von Vorteil, da hier, je nach Hersteller, die bereits vornumerierten Segmente unterschiedlich lang sein können. Weiterhin reduziert sich beim Querverschweißen von Schläuchen je nach Anzahl der nebeneinander angeordneten Schweißgeräte die Bearbeitungszeit entsprechend.A variant of the invention is that in a welding device designed as a table device, at least two, preferably six, welding devices are arranged next to one another in the hose direction. With such a welding device, hoses can be divided into segments and thermally welded, the number of segments being able to be different. Especially with blood bag tubes in the Usually five segments are required to carry out later cross-tests. Furthermore, the length of the individual segments can also be adjusted simultaneously with this welding machine. This in turn is particularly advantageous in the case of blood bag tubes, since here, depending on the manufacturer, the segments that have already been numbered can have different lengths. Furthermore, when cross-welding hoses, the processing time is reduced accordingly, depending on the number of welding devices arranged side by side.
Eine weitere Ausgestaltung der Erfindung sieht vor, daß zur Verschiebung ein scherenteleskopartig ausgebildeter Träger für die Schweißgeräte mit einer Einstellvorrichtung für den Abstand der einzelnen Schweißgeräte zueinander vorgesehen ist. Damit ist eine einfach handhabbare Einstellung der Abstände der einzelnen Schweißgeräte zueinander möglich.Another embodiment of the invention provides that a scissor-telescopic support for the welding devices with an adjusting device for the distance between the individual welding devices is provided for displacement. This makes it easy to set the distances between the individual welding devices.
Eine besonders bevorzugte Ausführungsform der Erfindung besteht darin, daß eine Schlauchspannvorrichtung vorgesehen ist. Dadurch wird beim Verschweißen eine höhere .Sicherheit erreicht, denn der gespannte Schlauch kann sich nun nicht mehr verwickeln oder aus Versehen mit mehreren Windungen in die Schlauchaufnahme gelangen. Hierbei ist es sehr vorteilhaft, daß die Schlauchspannvorrichtung ein etwa dem einen Ende des Trägers zugeordnetes Schweißgerät mit einem im Bereich der Schlauchaufnahme fest angeordneten Endschalter und eine dem anderen Ende des Trägers zugeordnete Schlauchklemme aufweist, wobei die Schlauchklemme eine wellenförmige Schlauchklemmaufnahme besitzt. Durch die wellenförmige Auslegung der Schlauchklemmaufnahme wird der eingelegte Schlauch beim Zusammendrücken der Schlauchklemme leicht gespannt, ohne dabei abgeklemmt zu werden. Damit die Klemmwirkung erzielt wird, ist der Durchmesser der Schlauchklemmaufnahme geringfügig kleiner als der Durchmesser des zu spannenden Schlauches.A particularly preferred embodiment of the invention is that a hose tensioning device is provided. This results in a higher level of safety when welding, because the tensioned hose can no longer become tangled or accidentally get into the hose holder with several turns. It is very advantageous that the hose tensioning device has a welding device, which is assigned to one end of the carrier and has a limit switch fixedly arranged in the region of the hose holder, and a hose clamp assigned to the other end of the carrier, the hose clamp having a corrugated hose clamp holder. Due to the wave-shaped design of the hose clamp receptacle, the inserted hose is compressed when the Hose clamp slightly tensioned without being pinched. So that the clamping effect is achieved, the diameter of the hose clamp receptacle is slightly smaller than the diameter of the hose to be tensioned.
Die Zeichnung zeigt ein Ausführungsbeispiel der Erfindung. Hierbei stellen dar:The drawing shows an embodiment of the invention. Here represent:
Figur 1 - einen Querschnitt,Figure 1 - a cross section,
Figur 2 einen Längsschnitt,FIG. 2 shows a longitudinal section,
Figur 3 eine Draufsicht einer Mehrfachanordnung,FIG. 3 shows a top view of a multiple arrangement,
Figur 4 eine Draufsicht einer Schlauchklemme,FIG. 4 shows a top view of a hose clamp,
Figur 5 einen Querschnitt der Schlauchklemme nach Figur .5 shows a cross section of the hose clamp according to FIG.
4, Figur 6 eine Teilansicht nach Figur l,4, FIG. 6 is a partial view according to FIG. 1,
Figur 7 eine Teilansicht nach Figur 2.FIG. 7 shows a partial view according to FIG. 2.
Wie in den Figuren 1 und 2 dargestellt, besteht das erfindungsgemäße Schweißgerät 1 aus einem Gehäuse 16 und einem Träger 18. Auf dem Träger 18 ist eine Preßbacke 7 . und eine Gegenelektrode 8 befestigt. Eine Preßbacke 3 ist gegen den Druck einer Feder 5 verschiebbar in einer Backenführung 6 gelagert, die auf dem Träger 18 angeordnet ist. Eine Abschirmvorrichtung 21, die die Preßbacke 3 von drei Seiten umschließt, ist an der Preßbacke 3 befestigt. An der Abschirmvorrichtung 21 ist eine Schlauchzentrierung 22 angeordnet. In der Preßbacke 3 ist eine durch eine Feder 4 vorgespannte Elektkrode 2 verschiebbar gelagert. Im Gehäuse 16 ist eine Schlauchaufnahme 15 vorgesehen, die von den Preßbacken 3 und 7 seitlich begrenzt wird. Am Träger 18 ist ein Betätigungshebel 9 angelenkt, der über einen Schieber 10 mit der Preßbacke 3 und der Elektrode 2 in Wirkverbindung steht. Am Schieber 10 ist ein Stift 11 und am Betätigungshebel 9 ist eine dem Stift 11 zugeordnete Ausnehmung 12 vorgesehen, wobei im Einbauzustand - wie in Figur 2 dargestellt - der Stift 11 in die Ausnehmung 12 eingreift. An der Elektrode 8 ist eine Schneidkante 19 angeordnet. Die Elektrode 2 liegt über eine Drosselspule 13, einen Schalter 14 und ein nicht dargestelltes Koaxialkabel an einer HF-Spannung. Die Schaltfunktion des Schalters 14 wird von dem Betätigungshebel 9 ausgelöst, wenn dieser ganz gedrückt wird. Die HF-Spannung und deren Steuerung wird in einem separaten HF-Verstärker erzeugt.As shown in FIGS. 1 and 2, the welding device 1 according to the invention consists of a housing 16 and a carrier 18. A pressing jaw 7 is on the carrier 18. and a counter electrode 8 is attached. A press jaw 3 is slidably supported against the pressure of a spring 5 in a jaw guide 6 which is arranged on the carrier 18. A shielding device 21, which surrounds the press jaw 3 from three sides, is attached to the press jaw 3. A hose centering 22 is arranged on the shielding device 21. In the press jaw 3 is an electrode 2 biased by a spring 4 slidably mounted. A hose receptacle 15 is provided in the housing 16 and is laterally delimited by the press jaws 3 and 7. An actuating lever 9 is articulated on the carrier 18 and is operatively connected to the pressing jaw 3 and the electrode 2 via a slide 10. A pin 11 is provided on the slide 10 and a recess 12 assigned to the pin 11 is provided on the actuating lever 9, the pin 11 engaging in the recess 12 in the installed state - as shown in FIG. 2. A cutting edge 19 is arranged on the electrode 8. The electrode 2 is connected to an RF voltage via a choke coil 13, a switch 14 and a coaxial cable (not shown). The switching function of the switch 14 is triggered by the actuating lever 9 when it is fully pressed. The RF voltage and its control is generated in a separate RF amplifier.
Im Bereich der Schlauchaufnahme 15 ist eine als Silikonfolie ausgebildete Abdeckvorrichtung 23 von vorne über die Elektrode 2 und die Preßbacke 3 gespannt und seitlich an der Preßbacke 3 befestigt. Die Silikonfolie verhindert sowohl das Eindringen von Feuchtigkeit in die Zwischenräume von der Preßbacke 3 und der Elektrode 2 als auch ein Überspringen von Funken von der Elektrode 2 zur Gegenelektrode 8, was beim Schweißvorgang durch die HF in Verbindung mit Feuchtigkeit auftreten kann.In the area of the hose receptacle 15, a cover device 23 designed as a silicone film is stretched from the front over the electrode 2 and the press jaw 3 and fastened to the side of the press jaw 3. The silicone film prevents both the penetration of moisture into the spaces between the press jaw 3 and the electrode 2 and also a jump of sparks from the electrode 2 to the counter electrode 8, which can occur during the welding process due to the HF in connection with moisture.
Die Schlauchaufnahme 15 wird nach unten hin durch eine vordere Bodenplatte 24 abgeschlossen. Auf dieser ist im Bereich der Preßbacke 3 eine hintere Bodenplatte 25 angeordnet, auf welcher die Backenführung 6 befestigt ist. Die Preßbacke 3 weist an ihrer zur Schlauchaufnahme 15 hin gerichteten Seite eine zur vorderen Bodenplatte 24 hinweisende Schürze 26 auf, wodurch ein schmaler Spalt '27 zwischen der Schürze 26 und der vorderen Bodenplatte 24 ausgebildet wird. Zwischen dem Spalt 27 und der hinteren Bodenplatte 25 ist eine Ausflußöffnung 28 etwa in Höhe des Spaltes 27 angeordnet. Die vordere Bodenplatte 24, die hintere Bodenplatte 25, der Spalt 27 und die Ausflußöffnung 28 bilden zusammen eine AbdichtVorrichtung 29. Diese verhindert, daß aus dem Schlauch austretende Flüssigkeit, die sich auf dem Boden der Schlauchaufnahme 15 gesammelt hat, in den hinteren Schweißgerätebereich, also beispielsweise unter die Backenführung 6, gelangen kann. Austretende Flüssigkeit fließt nun durch den Spalt 27 und die Ausflußöffnung 28 nach unten ab, wodurch die auf der hinteren Bodenplatte 25 angeordnete höherliegende Backenführung 6 nicht mit der Flüssigkeit in Kontakt kommt. Da der Spalt 27 sehr schmal ist, bleibt die Schlauchaufnahme 15 weiterhin elektromagnetisch abgeschirmt.The hose receptacle 15 is closed at the bottom by a front base plate 24. A rear base plate 25, on which the jaw guide 6 is fastened, is arranged on this in the region of the press jaw 3. The cheek plate 3 has on its directed towards the tubular receptacle 15 to a side pointing toward the front bottom plate 24 skirt 26, whereby a narrow gap '27 is formed between the apron 26 and the front base plate 24. Between the gap 27 and the rear base plate 25, an outflow opening 28 is arranged approximately at the level of the gap 27. The front base plate 24, the rear base plate 25, the gap 27 and the outflow opening 28 together form a sealing device 29. This prevents the liquid escaping from the hose, which has collected on the bottom of the hose holder 15, from entering the rear welding machine area, ie for example, can get under the jaw guide 6. Escaping liquid now flows down through the gap 27 and the outflow opening 28, as a result of which the higher jaw guide 6 arranged on the rear base plate 25 does not come into contact with the liquid. Since the gap 27 is very narrow, the hose receptacle 15 remains shielded electromagnetically.
Figur 3 zeigt sechs nebeneinander verschiebbar angeordnete Schweißgeräte 1 auf einem Träger 31. Auf dem Träger 31 sind sechs Grundplatte 32 und darauf eine Trägerplatte 33 angeordnet, auf welcher ein Schweißgerät 1 montiert ist. Die Führung der Trägerplatte 33 wird durch die Führungsschiene 34, welche mit einer Führungsstütze 35 auf beiden Seiten der Trägerplatte 33 verbunden ist, erreicht. Die Grundplatten 32 sind über Gelenkarme 36 und Gelenkarmlager 37 miteinander verbunden. Die Gelenkarmlager 37 und die Führungsstützen 35 werden durch Führungswellen 38 miteinander verbunden, welche in Seitenplatten 39 gelagert sind. Die Verstellung der Abstände zwischen den einzelnen Schweißgeräten 1 erfolgt durch Veränderung des Abstandes der beiden Führungswellen 38 zueinander. Hierzu ist eine mit einem Handrad 40 versehene Spindel 41 mit den beiden Führungswellen 38 verbunden. Je nach Drehrichtung des Handrades 40 zieht oder drückt die Spindel 41 die beiden Führungswellen 38 zusammen oder auseinander, wobei die Führungsschienen 34 und die Seitenplatten 39 die Veränderung nur in einer Richtung zulassen. Da die Gelenkarmlager 37 mit den beiden Führungswellen 38 fest verbunden sind, wird beim Betätigen des Handrades 10 der Abstand zwischen jeweils 2 Schweißgeräten in gleicher Weise verändert.FIG. 3 shows six welding devices 1 which can be moved next to one another on a carrier 31. Six base plates 32 are arranged on the carrier 31 and a carrier plate 33 is arranged thereon on which a welding device 1 is mounted. The support plate 33 is guided by the guide rail 34, which is connected to a guide support 35 on both sides of the support plate 33. The base plates 32 are connected to one another via articulated arms 36 and articulated arm bearings 37. The articulated arm bearings 37 and the guide supports 35 are connected to one another by guide shafts 38 which are mounted in side plates 39. The spacing between the individual welding devices 1 is adjusted by changing the spacing of the two guide shafts 38 from one another. For this purpose, a spindle 41 provided with a handwheel 40 is provided with the two Guide shafts 38 connected. Depending on the direction of rotation of the handwheel 40, the spindle 41 pulls or pushes the two guide shafts 38 together or apart, the guide rails 34 and the side plates 39 only permitting the change in one direction. Since the articulated arm bearings 37 are firmly connected to the two guide shafts 38, the distance between two welding devices is changed in the same way when the handwheel 10 is actuated.
Für die Mehrfachanordnung der Schweißgeräte 1 ist eine Schlauchspannvorrichtung 42 vorgesehen, welche ein dem einen Ende 43 des Trägers 31 zugeordnetes Schweißgerät mit .einem fest angeordneten Endschalter 44 und eine dem anderen Ende 45 des Trägers 31 zugeordnete Schlauchklemme 46 aufweist. Die Schlauchklemme 46 besteht aus einem Gehäuse 47, einem vorderen Klemmteil 48 und einem hinteren Klemmteil 49. Zwischen den beiden Klemmteilen 48 und 49 ist eine als Zapfen ausgebildete Schlauchauflage 50 angeordnet, über welcher sich eine wellenförmige Schlauchklemmaufnahme 51 befindet. Wahlweise kann eine der beiden Klemmteile 48 und 49 feststehend sein, während der andere mechanisch durch ein Magnetventil oder einen Druckluftzylinder bewegt wird. Durch die Schlauchauflage 50 wird der eingelegte Schlauch auch bei geöffneter Schlauchklemme 46 auf der zur Klemmung notwendigen Höhe gehalten und somit zentriert. Der Durchmesser der Schlauchklemmaufnahme 51 ist geringfügig kleiner als der zu spannende Schlauch, so daß bei geschlossener Schlauchklemme 46 der Schlauch durch die wellenförmige Auslegung der Schlauchklemmaufnahme 51 leicht gespannt wird, ohne dabei abgeklemmt zu werden.For the multiple arrangement of the welding devices 1, a hose tensioning device 42 is provided, which has a welding device assigned to one end 43 of the carrier 31 with a fixed limit switch 44 and a hose clamp 46 assigned to the other end 45 of the carrier 31. The hose clamp 46 consists of a housing 47, a front clamping part 48 and a rear clamping part 49. Between the two clamping parts 48 and 49 there is a hose support 50 designed as a pin, above which there is a wave-shaped hose clamp receptacle 51. One of the two clamping parts 48 and 49 can optionally be stationary, while the other is moved mechanically by a solenoid valve or a compressed air cylinder. Through the hose support 50, the inserted hose is held at the height necessary for clamping, and thus centered, even when the hose clamp 46 is open. The diameter of the hose clamp receptacle 51 is slightly smaller than the hose to be tensioned, so that when the hose clamp 46 is closed, the hose is slightly tensioned by the wave-shaped design of the hose clamp receptacle 51 without being clamped.
Wird ein Schlauch in die Schlauchaufnahme 15 der Schweißgeräte 1 eingelegt, so wird der Endschalter 44 und ein an der Schlauchklemme 46 angeordnete Schalter 52 betätigt. Der Endschalter 44 bewirkt, daß das Schweißgerät 1 betätigt wird und den Schlauch abklemmt. Nach erfolgter Klemmung wird die Schlauchklemme 46 automatisch geschlossen, wodurch der Schlauch geringfügig gespannt wird. Eine elektronische Logikschaltung sorgt dafür, daß die Schlauchspannung erst erfolgt, wenn der Schlauch beide Endschalter 44, 52 betätigt hat und das erste Schweißgerät 1 geklemmt hat. Nach erfolgter Klemmung und Schlauchspannung schließen nacheinander die anderen Schweißgeräte stets in Richtung zur Schlauchklemme hin ansteigend, damit die Flüssigkeit im Schlauch in einen Blutbeutel 53 entweichen kann.If a hose in the hose holder 15 of the Welding devices 1 inserted, the limit switch 44 and a switch 52 arranged on the hose clamp 46 are actuated. The limit switch 44 causes the welding device 1 to be actuated and to pinch the hose. After clamping, the hose clamp 46 is automatically closed, whereby the hose is slightly tensioned. An electronic logic circuit ensures that the hose is only tensioned when the hose has actuated both limit switches 44, 52 and the first welding device 1 has clamped. After clamping and hose tensioning, the other welding devices always close in ascending order in the direction of the hose clamp so that the liquid in the hose can escape into a blood bag 53.
Das erfindungsgemäße Schweißgerät arbeitet wie folgt: Ein in den Figuren 1 und 2 nicht dargestellter mit Flüssigkeit, z.B. Blut, gefüllter Kunststoffschlauch, z.B. PVC, wird in die zwischen den Elektroden 2 und 8 vorgesehene Schweißaufnahme 15 im Gehäuse 16 eingelegt. Durch Drücken des Betätigungshebels 9 im Gegenuhrzeigersinn werden die Preßbacke 3, die daran befestigte Abschirmvorrichtung 21 und die Elektrode 2 von dem mit dem Betätigungshebel 9 in Wirkverbindung stehenden Schieber 10 in Richtung Preßbacke 7 und gegen Elektrode 8 bewegt. Der in die Schlauchaufnahme 15 eingelegte Folienschlauch wird durch dieThe welding device according to the invention operates as follows: a welding device not shown in FIGS. 1 and 2, e.g. Blood, filled plastic tube, e.g. PVC is inserted into the weld receptacle 15 provided between the electrodes 2 and 8 in the housing 16. By pressing the actuating lever 9 in the counterclockwise direction, the pressing jaw 3, the shielding device 21 attached to it and the electrode 2 are moved in the direction of the pressing jaw 7 and against the electrode 8 by the slide 10 which is operatively connected to the actuating lever 9. The film tube inserted into the tube holder 15 is replaced by the
Schlauchzentrierung 22 in eine definierte Lage geschoben, bis die Elektrode 2 in Kontakt mit dem eingelegten Folienschlauch kommt. Durch weiteres Vordrücken wird die Elektrode durch den Gegendruck des Schlauches gegen den Druck der Feder 4 bis zum Anschlag 17 an der Preßbacke 3 zurückgedrückt. Dadurch wird der Schlauch zuerst zwischen den Elektroden 2 und 8 zusammengepreßt und die Flüssigkeit im Schlauch im Bereich der Elektroden weggedrückt. Beim weiteren Vordrücken der Preßbacke 3 wird der Kunststoffschlauch von den Preßbacken 3 und 7 schraubstockartig zusammengepreßt und die Schlauchaufnahme 15 durch die Abschirmvorrichtung 21 abgeschirmt. Durch die in Richtung quer zur Schweißstelle ansteigend ausgebildete Druckfläche 20 der Preßbacke 7 wird die Flüssigkeit weiter von der Schweißstelle weggedrückt. Kurz vor seiner Endstellung wird von dem Betätigungshebel 9 über den Schalter 14 der Schweißvorgang ausgelöst, wobei die Schweißdauer von der eingestellten Schweißzeit bestimmt wird. Durch die an der Gegenelektrode 8 vorgesehene Schneidkante 18 wird der Folienschlauch getrennt bzw. mit einer Trennstelle versehen. Nach Beendigung des Schweißvorganges wird der Betätigungshebel 9 entlastet und die Elektrode 2 und die Preßbacke 3 von den Federn 4 und 5 in ihre Grundstellung zurückgedrückt. Tube centering 22 pushed into a defined position until the electrode 2 comes into contact with the inserted foil tube. By further pushing the electrode back against the pressure of the spring 4 by the pressure of the hose up to the stop 17 on the press jaw 3. As a result, the tube is first compressed between the electrodes 2 and 8 and the Liquid in the hose in the area of the electrodes is pushed away. When the press jaw 3 is pushed forward further, the plastic hose is pressed together in a vice-like manner by the press jaws 3 and 7 and the hose receptacle 15 is shielded by the shielding device 21. Due to the pressure surface 20 of the press jaw 7, which increases in the direction transverse to the welding point, the liquid is pressed further away from the welding point. Shortly before its end position, the actuating lever 9 triggers the welding operation via the switch 14, the welding duration being determined by the welding time set. The film tube is separated or provided with a separation point by the cutting edge 18 provided on the counter electrode 8. After completion of the welding process, the actuating lever 9 is relieved and the electrodes 2 and the pressing jaw 3 are pressed back into their basic position by the springs 4 and 5.

Claims

Patentansprüche Claims
1. Schweißgerät zum Querverschweißen von mit Flüssigkeit gefüllten Kunststoffschläuchen mit einer Schlauchaufnahme{15J, einer Quetscheinrichtung für den Schlauch mit einer verschiebbaren Preßbacke (3) und einer Schweißeinrichtung mit einer in der verschiebbaren Preßbacke (3) gelagerten Elektrode (2) , dadurch gekennzeichnet, daß im Bereich der Schlauchaufnahme (15) eine Abschirmvorrichtung (21) verschiebbar angeordnet ist.1. Welding device for cross welding of liquid-filled plastic hoses with a hose holder {15J, a squeezing device for the hose with a displaceable press jaw (3) and a welding device with an electrode (2) mounted in the displaceable press jaw (3), characterized in that A shielding device (21) is arranged displaceably in the area of the hose receptacle (15).
2. Schweißgerät nach Anspruch 1, dadurch gekennzeichnet, daß die Abschirmvorrichtung (21) mit der Preßbacke (3) in Wirkverbindung steht.2. Welding device according to claim 1, characterized in that the shielding device (21) with the press jaw (3) is in operative connection.
3. Schweißgerät nach einem oder beiden der Ansprüche 1 und 2, dadurch gekennzeichnet, daß an der Abschirmvorrichtung (21) eine Schlauchzentrierung (22) vorgesehen ist.3. Welding device according to one or both of claims 1 and 2, characterized in that a hose centering (22) is provided on the shielding device (21).
4. Schweißgerät nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß im Bereich der Schlauchaufnahme (15) eine Abdeckvorrichtung (23) für die in der Preßbacke (3) gelagerten Elektrode (2) angeordnet ist.4. Welding device according to one of claims 1 to 3, characterized in that a covering device (23) for the electrode (2) mounted in the press jaw (3) is arranged in the region of the hose receptacle (15).
5. Schweißgerät nach Anspruch 4, dadurch gekennzeichnet, daß die Abdeckvorrichtung (23) über die Elektrode (2) und die Preßbacke (3) gespannt und an der Preßbacke (3) befestigt ist.5. Welding device according to claim 4, characterized in that the covering device (23) over the electrode (2) and the press jaw (3) is stretched and attached to the press jaw (3).
6. Schweißgerät nach einem oder beiden der Ansprüchen 4 und 5, dadurch gekennzeichnet, daß die Abdeckvorrichtung (23) als nichtleitende Folie, insbesondere Silikonfolie, ausgebildet ist.6. Welding machine according to one or both of claims 4 and 5, characterized in that the covering device (23) is designed as a non-conductive film, in particular silicone film.
7. Schweißgerät nach einem oder mehreren der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß im Bereich der verschiebbaren Preßbacke (3) eine AbdichtVorrichtung C29) für Flüssigkeiten angeordnet ist,7. Welding device according to one or more of claims 1 to 6, characterized in that a sealing device C29) for liquids is arranged in the region of the displaceable pressing jaw (3),
8. Schweißgerät nach Anspruch 7, dadurch gekennzeichnet, daß die Abdichtvorrichtung (29) eine hintere Bodenplatte (25) , auf welcher die Preßbacke (3) angeordnet ist, einen Spalt (27) , welcher zwischen der Schlauchaufnahme (15) und der hinteren Bodenplatte (25) liegt und tiefer als die Oberkante der hinteren Bodenplatte (25) angeordnet ist, und eine etwa auf der Höhe des Spaltes (27) liegende Ausflußöffnung (28) aufweist.8. Welding device according to claim 7, characterized in that the sealing device (29) has a rear base plate (25) on which the press jaw (3) is arranged, a gap (27) which is between the hose receptacle (15) and the rear base plate (25) lies and is arranged lower than the upper edge of the rear base plate (25), and has an outflow opening (28) lying approximately at the height of the gap (27).
9. Schweißgerät nach Anspruch 8, dadurch gekennzeichnet, daß der Spalt durch eine an der Preßbacke (3) angeordnete, zu einer vorderen Bodenplatte (24) hinweisenden Schürze (26) ausgebildet ist.9. Welding device according to claim 8, characterized in that the gap is formed by an on the press jaw (3), to a front base plate (24) pointing apron (26).
10. Als Tischgerät ausgebildetes Schweißgerät, dadurch gekennzeichnet, daß mindestens zwei, vorzugsweise sechs Schweißgeräte in Schlauchrichtung nebeneinander verschiebbar angeordnet sind.10. A table-top welding device, characterized in that at least two, preferably six, welding devices are arranged next to one another in the hose direction.
11. Schweißgerät nach Anspruch 10, dadurch gekennzeichnet, daß ein scherenteleskopartig ausgebildeter Träger (31) für die Schweißgeräte mit einer Einsteilvorrichtung (40, 41) für den Abstand der einzelnen Schweißgeräte zueinander vorgesehen ist.11. Welding device according to claim 10, characterized in that a scissor-type telescopic support (31) for the welding devices with an adjusting device (40, 41) is provided for the distance between the individual welding devices.
12. Schweißgerät nach einem oder beiden der Ansprüche 10 und 11, dadurch gekennzeichnet, daß eine Schlauchspannvorrichtung (42) vorgesehen ist.12. Welding device according to one or both of claims 10 and 11, characterized in that a hose tensioning device (42) is provided.
13. Schweißgerät nach Anspruch 12, dadurch gekennzeichnet, daß die Schlauchspannvorrichtung (42) ein etwa dem einen Ende (43) des Trägers (31) zugeordnetes Schweißgerät (1) mit einem im Bereich der Schlauchaufnahme (15) fest angeordneten Endschalter (44) und eine dem anderen Ende (45) des Trägers (31) zugeordnete Schlauchklemme (46) aufweist, wobei die Schlauchklemme (46) eine wellenförmige Schlauchklemmaufnahme (51) besitzt. 13. Welding device according to claim 12, characterized in that the hose tensioning device (42) has an approximately one end (43) of the carrier (31) associated welding device (1) with a fixed in the area of the hose holder (15) limit switch (44) and has a hose clamp (46) assigned to the other end (45) of the carrier (31), the hose clamp (46) having a corrugated hose clamp receptacle (51).
PCT/EP1992/001967 1991-08-30 1992-08-26 Welding appliance for cross-welding liquid-filled plastic tubing WO1993004833A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP92918478A EP0601026A1 (en) 1991-08-30 1992-08-26 Welding appliance for cross-welding liquid-filled plastic tubing

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19914128814 DE4128814A1 (en) 1990-05-02 1991-08-30 Hand-operated appliance for cross-welding plastics material tubes filled with liq. - has squeezing unit for tube with fixed and moving jaws and welding unit with two electrodes lying opposite each other reaching in tube reception part
DEP4128814.9 1991-08-30

Publications (2)

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WO1993004833A2 true WO1993004833A2 (en) 1993-03-18
WO1993004833A3 WO1993004833A3 (en) 1993-05-13

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DE1185320B (en) * 1958-09-02 1965-01-14 E H L Pungs Dr Ing Dr Ing Device for continuous heating of progressively moving electrically non-conductive materials, in particular for the purpose of welding
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Publication number Priority date Publication date Assignee Title
US2401991A (en) * 1942-02-25 1946-06-11 British Insulated Cables Ltd Machine for compressing and heating electrically thermoplastic materials
DE948918C (en) * 1952-04-27 1956-09-06 Lorenz C Ag Press for dielectric hot processing and welding of foils made of organic, thermoplastic material
GB754073A (en) * 1953-10-14 1956-08-01 Philips Electrical Ind Ltd Improvements in or relating to screened spaces for high-frequency dielectric heatingof work pieces
DE1091256B (en) * 1954-02-22 1960-10-20 Dorothy Frances Pickering Device for the combined welding and cutting of hoses made of thermoplastic material by means of dielectric high-frequency heating
DE1185320B (en) * 1958-09-02 1965-01-14 E H L Pungs Dr Ing Dr Ing Device for continuous heating of progressively moving electrically non-conductive materials, in particular for the purpose of welding
GB2053084A (en) * 1979-06-27 1981-02-04 Massey Sports Ltd Joining plastics sheet material
US4390832A (en) * 1980-02-19 1983-06-28 Engineering & Research Associates, Inc. Circuit for electro mechanical tubing sealer
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Also Published As

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WO1993004833A3 (en) 1993-05-13

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