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
  • B65B7/00—Closing containers or receptacles after filling
  • B65B7/16—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons
  • B65B7/28—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons by applying separate preformed closures, e.g. lids, covers
  • B65B7/2828—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons by applying separate preformed closures, e.g. lids, covers inserting and rotating screw stoppers

Definitions

• Screwing device for screwing caps on the bung holes of drums
• the invention relates to a screwing device for screwing and / or unscrewing closure caps on the bung holes of drums, having a centering ring and a screwing tool which is mounted coaxially in the centering ring and can be displaced in the axial direction relative to the centering ring and which has a rotary drive is connected, wherein the centering ring is movably mounted on a support frame, which in turn is arranged vertically raised and lowered above the stand of the barrel.
• a problem with such screwing devices is to align the screwing tool precisely with the thread of the bung hole so that the lids are not screwed on at an angle or during the screwing process, constraints occur which cause the thread de on the bunghole or ceiling "! Such constraints must be avoided in particular if the cover and / or screw thread on the bunghole are made of plastic or coated with anti-corrosive coatings that must not be damaged. This is made more difficult Aligning the screwing tool by virtue of the fact that the barrel covers, in which the bung holes are located, are concavely arched or convex, these different curvatures of the barrel cover pivoting the axis of the screw thread of the bung hole by relatively large angles which occur during alignment the screwing device must be compensated.
• the centering ring is supported on the supporting frame by means of spring bolts and, when the supporting frame is lowered while deforming the springs, the spring bolt can to a certain extent on the Bung hole are aligned, both with regard to the center of the bung hole and with regard to the inclination of the axis of the screw thread of the bung hole.
• the screwing tool mounted in the centering ring is of course also aligned with the axis of the bung hole. So that the adjustment movements of the screwing tool are not impeded by the rotary drive rigidly connected to the supporting frame, a double universal joint is provided between the rotary drive and the screwing tool.
• the object of the invention is to further develop the screwing device of the type mentioned at the outset in such a way that it makes large adjustment movements both with respect to the center of the bunghole and in With regard to the spatial position of the axis of the screw thread and angularly movable joints between the screw head and the rotary drive are not required.
• the axial displacement path covered by the screwing tool during the screwing process should be fixable to a predetermined dimension.
• the invention proposes off 'continuously from a screwing of the type mentioned ge called before that the centering ring and the drive tool and the rotary drive are combined to form a insge ⁇ including pivotable assembly, the sides pivotable by means of a ball joint on the supporting frame is mounted, which in turn can be displaced on all sides on a cross slide in a horizontal plane, the screwing tool being connected for its axial displacement to a displacement device arranged in the structural unit.
• the combination of the centering ring, the screwing tool, the rotary drive and the displacement device for the screwing tool into an overall pivotable unit and the mounting of this unit pivotable on all sides in a joint ball on the frame floating in the horizontal plane make it possible to mount the entire unit in Align with respect to the bung hole without having to overcome elastic restoring forces and without the displacement and pivoting paths being narrowly limited. Due to the arrangement of the screwing tool and the rotary drive in the overall pivotable structural unit, no universal joint is required between the rotary drive and the screwing tool, so that the screwing tool always has the same torque is working. In addition, in a particularly advantageous manner, the axial displacement path of the screwing tool can be precisely defined on the displacement device, specifically on the basis of initial conditions defined exactly at the position of the bunghole.
• the centering ring is provided above its conical centering surface with an annular support shoulder for support on the end face of the barrel bung.
• This annular support shoulder forms a flat stop and support surface in the centering ring, on which the entire structural unit can align itself, without the upper end of the barrel bung 5 being subjected to constraints during the alignment process.
• the displacement device expediently has one or more displacement cylinders which are arranged in the structural unit and are actuated by pressure medium.
• Such displacement cylinders are easy to operate and can be controlled very precisely with little effort, both with regard to the distance traveled and with regard to the displacement forces generated. 5
• the structural unit expediently has path limiting devices for the axial movement path and / or the angle of rotation of the screwing tool.
• force-shifting devices for limiting the axial shifting forces are assigned to the shifting device.
• the assembly In order to return the assembly to the vertical starting position after the completion of each screwing operation, the assembly is also assigned an alignment cylinder which is supported on the support frame and which, when pressurized, aligns the longitudinal axis of the assembly perpendicular to the plane of the support frame and, when the pressure is released, the assembly for Releases pivoting movements.
• the alignment cylinder is expediently designed as a ring cylinder surrounding the unit, the ring piston of which is provided with radial support fingers which are supported on the upper side of the support frame. This results in a particularly compact design of the alignment device.
• the upper side of the supporting frame is finally provided with a reset device for displacing the frame into the predetermined starting position.
• FIG. 1 shows a vertical section through the
• Fig. 2 in an enlarged scale a section through the centering ring.
• the supporting frame is designated with the reference symbol 1.
• the support frame 1 is floating on a cross slide 2 in the horizontal plane, i.e. slidably mounted on all sides.
• the cross slide 2 is provided with bearings 3 designed as ball bushings in order to achieve particularly good smoothness.
• the cross slide 2 is in turn carried by a horizontal support arm 4.
• the horizontal support arm is fastened to a vertical support arm 5 which can be adjusted in the vertical direction by means of a lifting device 6.
• a unit, designated in its entirety by 8 is pivotally mounted on all sides by means of a joint ball 7, which has the rotary drive 9 of the screwing device at the upper end, a centering ring 10 at the lower end and a screwing tool 11 mounted concentrically in the centering ring 10 .
• the screwing tool 11, which is axially displaceably mounted in the centering ring 10, is provided with a wrench head 12 for positive engagement in the cover lock to be screwed and has a coupling 13 at the opposite end, via which it is connected to the rotary drive 9.
• This coupling 13 is designed as an axially displaceable and non-rotatable shaft connection.
• the assembly 8 there are also pressure-sensitive Tel-actuated shift cylinder 14, which can move the screwing tool 11 relative to the structural unit 8 so that it can follow the screwing-in path of the screw closure.
• the piston rods 15 of these displacement cylinders 14 engage a bearing block 16 which is axially displaceably mounted in the structural unit 8 and which contains an axial bearing 17 for the screwing tool 11.
• the displacement cylinders 14 are supplied with pressure medium via pressure medium channels 18, the pressure medium application of which is controlled by a control valve 19a.
• An adjustable pressure limiting valve 19b is also connected into the pressure medium channels 18, by means of which the displacement forces generated by the displacement cylinders 14 are limited to a permissible maximum.
• the rotary drive 9 can be provided with a rotation angle measuring device 22 which determines the angular path traveled by the screwing tool 11 and switches off the rotary drive 9 after a specific angular path has been covered.
• the lower end of the assembly 8 is surrounded by a pressure-medium-actuated ring cylinder 23, in which an annular piston 24 is supported so that it can be pushed out downwards.
• This ring piston 24 is provided at its lower end with radially outwardly projecting support fingers 25 which are supported on the top of the support frame 1 and thereby lower the axis of the assembly 8. align right to the level of the support frame 1.
• the pressure medium supply of the ring cylinder 23 takes place via a pressure medium line 26.
• an alignment cylinder 28 which can be extended downward is fastened to the vertical support arm 5 by means of a fastening bracket 27.
• the downwardly extendable piston rod 29 of this alignment cylinder 28 is provided with a support head 30 which can be inserted from above into a conical recess 31 on the top of the support frame 1 and aligns the support frame 1 in a predetermined starting position relative to the support frames 4 and 5.
• centering ring 10 is not yet precisely aligned above the barrel bung 35 located under the screwing device and that the lid lock to be screwed in is fixed in the wrench head 12 of the screwing tool 11 by a vacuum holding device or the like.
• the ring cylinder 23 is »depressurized, so that the assembly 6 with the joint ball 7 can pivot to all sides relative to the supporting frame 1.
• the piston rod 29 of the alignment cylinder 28 is retracted so that the support frame 1 can move freely on all sides in the horizontal plane.
• the unit 8 is lowered by a corresponding actuation of the lifting device 6.
• the conical centering surface 33 of the centering ring 10 aligns the.
• Support frame 1 in the horizontal plane so that the structural unit is located exactly centrally above the barrel bung 35.
• the supporting shoulder of the Fadedspun- 34 applies to the end face "of the 35 and pivoted while the axis of the Bauein ⁇ unit 8 so that they the Fcredspundes 35 coincides with the longitudinal axis of the thread bob ⁇ .
• the entire structural unit 8 is raised by a corresponding actuation of the lifting device 6.
• the ring cylinder 23 is pressed with acted upon so that the annular piston 24 extends and the support fingers 25 are supported on the upper side of the support frame 1 and thereby align the structural unit 8 accordingly.
• the aligning cylinder 28 is also pressurized so that its extending piston rod 29 engages with the support head 30 in the conical recess 31 on the upper side of the support frame 1 and moves it back into the predetermined starting position.
• the screwing device is now ready to insert another cover lock and the next working game. Unscrewing a lid lock is done in the reverse order.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Clamps And Clips (AREA)
• Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6278936

Family Applications (1)

Country Status (3)

Families Citing this family (6)

Family Cites Families (5)

• 1985
  • 1985-08-20 DE DE19853529773 patent/DE3529773A1/de active Granted
• 1986
  • 1986-08-02 WO PCT/EP1986/000459 patent/WO1987001091A1/de not_active Application Discontinuation
  • 1986-08-02 EP EP19860905255 patent/EP0233927A1/de not_active Withdrawn

Non-Patent Citations (1)

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