Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
  • B63B73/00—Building or assembling vessels or marine structures, e.g. hulls or offshore platforms
  • B63B73/60—Building or assembling vessels or marine structures, e.g. hulls or offshore platforms characterised by the use of specific tools or equipment; characterised by automation, e.g. use of robots
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63C—LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
  • B63C5/00—Equipment usable both on slipways and in dry docks
  • B63C5/02—Stagings; Scaffolding; Shores or struts
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
  • B63B73/00—Building or assembling vessels or marine structures, e.g. hulls or offshore platforms
  • B63B73/40—Building or assembling vessels or marine structures, e.g. hulls or offshore platforms characterised by joining methods
  • B63B73/43—Welding, e.g. laser welding
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
  • B63B73/00—Building or assembling vessels or marine structures, e.g. hulls or offshore platforms
  • B63B73/50—Building or assembling vessels or marine structures, e.g. hulls or offshore platforms characterised by forming methods, e.g. manufacturing of curved blocks
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63C—LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
  • B63C5/00—Equipment usable both on slipways and in dry docks
  • B63C5/02—Stagings; Scaffolding; Shores or struts
  • B63C2005/022—Shores or struts, e.g. individual oblique support elements for stabilizing hulls in dry-docks

Definitions

• the present invention relates, in general, to a pin jig for supporting a curved structure and, more particularly, to a novel pin jig for supporting a curved structure, which is constructed so that constant elastic force is always applied to a moving plate regardless of its vertical position, thus allowing a male jig to smoothly move up and down.
• Background Art
• a pin jig is used to support a curved structure having a curved surface, such as the hull of a vessel.
• the pin jig is mainly used to support the bottom of each block of a hull which is being built.
• each hull block In order to build the hull, first, a plurality of blocks is individually constructed. Subsequently, the blocks are coupled with each other, thus forming the hull.
• the bottom of each hull block has a curved surface.
• the height of each pin jig is adjusted to correspond to the vertical position of the bottom of each block. In this way, the respective blocks are held at desired positions. In this state, the blocks are welded to each other.
• FIG. 1 shows the conventional pin jig.
• the conventional pin jig includes a supporter 11, a height adjusting nut 12, a female jig 13, and a male jig 14.
• the male jig 14 is inserted into the female jig 13 in such a way as to move vertically.
• the height adjusting nut 12 is secured to the upper end of the male jig 14.
• the supporter 11 is the part that substantially supports each of the blocks constituting a hull, and is constructed to move vertically in the height adjusting nut 12.
• the supporter 11 and the height adjusting nut 12 are fastened to each other through a screw-type fastening method, thus allowing the height of the supporter 11 to be finely adjusted.
• Fastening holes 13a and 14a are formed in the female jig 13 and the male jig 14, respectively.
• a locking key 15 is sequentially inserted into the fastening holes 13a and 14a, so that the male jig 14 is locked to the female jig 13.
• the male jig 14 of the conventional pin jig weighs about 15 to 25kg, a worker himself must manually raise and lower the male jig 14 so as to adjust the height of the male jig 14.
• the conventional pin jig is problematic in that repetitive work may overstrain the muscles of the worker's waist or arms.
• the third art Korean U.M. Appln. Nos. 20-2004-006020 and 20-2005-19749
• the first art the height of a male jig is more easily adjusted by manipulating a handle which is provided on the outer portion of a female jig.
• the second art is intended to allow the height of a male jig to be more conveniently adjusted using a weight.
• the third art is intended to allow the height of a male jig to be more conveniently adjusted using a spiral spring.
• the first art is problematic in that the construction for installing the handle is complex, and the manufacturing cost is high.
• the second art is problematic in that the manufacturing cost is high because of the weight.
• the third art is problematic in that it is difficult to precisely mount the spiral spring to the outer portion of the female jig, and the manufacturing process is difficult.
• an object of the present invention is to provide a novel pin jig for supporting a curved structure, which is simple in construction, is low in manufacturing cost, can move a male jig with constant force regardless of the height of the male jig, and allows the male jig to be stably held at an adjusted height after the height of the male jig is adjusted.
• the present invention provides a height adjusting device of a pin jig for supporting a curved structure, including a base plate; a pair of support pins supported at lower ends thereof to respective sides of an upper surface of the base plate, and extending in a longitudinal direction; a screw shaft rotatably supported at a lower end thereof to a center of the upper surface of the base plate in such a way as to extend in a longitudinal direction, with a spiral groove formed in a circumferential surface of the screw shaft; a moving plate moving vertically while being supported by the two support pins, with the two support pins and the screw shaft passing through the moving plate, a moving protrusion protruding from an inner circumferential surface of a portion of the moving plate, through which the screw shaft passes, and being fitted into the spiral groove of the screw shaft, thus rotating the screw shaft as the moving plate moves vertically; and a restoring unit mounted on upper ends of the support pins, and having a restoring member compressed or restored by rotation of
• the spiral groove of the screw shaft is formed such that a pitch of the spiral groove is gradually increased in a direction from an upper end to a lower end of the screw shaft.
• the pitch of the spiral groove is increased or reduced in proportion to variation in a restoring force of the restoring member according to the position of the moving plate.
• the moving protrusion of the moving plate comprises a rotatable bearing.
• the restoring unit includes a casing for accommodating the restoring member therein, and a rotary shaft which is rotatably supported at an upper end thereof to an upper surface of the casing, and is mounted at a lower end thereof to the screw shaft, and compresses or restores the restoring member according to the rotating direction of the screw shaft.
• the restoring member comprises a spiral spring, which is supported at both ends thereof to a circumferential surface of the rotary shaft and an inner wall of the casing, an inside portion of the restoring member being wound around the rotary shaft.
• the spiral groove formed on the screw shaft comprises at least two spiral grooves, which are symmetrically formed in the circumferential surface of the screw shaft, and the moving protrusion of the moving plate comprises a plurality of moving protrusions such that the moving protrusions are fitted into corresponding spiral grooves.
• a height adjusting device of a pin jig for supporting a curved structure has the following effects.
• the height adjusting device of the pin jig for supporting the curved structure minimizes the worker's force required to adjust the height of a male jig, and prevents the male jig from abruptly moving downwards, thus preventing accidents.
• the height adjusting device of the pin jig for supporting the curved structure has a simple construction, so that it is light and convenient to install.
• the height adjusting device of the pin jig for supporting the curved structure is constructed to be inserted into a female jig, so that no part is exposed outside the female jig, and an operation of assembling the device to the female jig is not required.
• the height adjusting device of the pin jig for supporting the curved structure is constructed so that a moving plate is moved up and down while being supported by two support pins, thus allowing the height of the male jig to be stably adjusted.
• the height adjusting device of the pin jig for supporting the curved structure can be used to change the height of the male jig with constant force, regardless of the height of the male jig.
• FIG. 1 is an exploded perspective view illustrating a conventional pin jig for supporting a curved structure
• FIG. 2 is an exploded perspective view illustrating a pin jig for supporting a curved structure according to the preferred embodiment of the present invention
• FIGS. 3 and 4 are sectional views illustrating the operation of the pin jig for supporting the curved structure according to the preferred embodiment of the present invention.
• FIGS. 5 to 7 are plan sectional views illustrating the coupling of a moving plate and a screw shaft of each of pin jigs for supporting a curved structure according to the preferred embodiments of the present invention.
• the pin jig for supporting the curved structure includes a female jig 130, a male jig 140, a height adjusting nut 120, a supporter 110, and a height adjusting device according to the embodiment of the present invention.
• the female jig 130 is installed at a working site (e.g. a working site for welding blocks of a hull), and comprises a hollow pipe (preferably having a cylindrical shape).
• One or more ribs 132 are radially provided on the lower portion on the circumferential surface of the female jig 130, and function to stably support the female jig 130 on the ground.
• one or more first fastening holes 131 are formed in the upper end on the circumferential surface of the female jig 130 in such a way as to pass horizontally through the female jig, and are used to fasten the male jig 140 to the female jig 130.
• the locking key 150 is inserted into the first fastening holes 131.
• the male jig 140 is installed in the female jig 130 in such a way as to move up and down, and comprises a hollow pipe (preferably having a cylindrical shape).
• a plurality of second fastening holes 141 is formed in the circumferential surface of the male jig 140 in such a way as to be spaced apart from each other at regular intervals in the longitudinal direction of the male jig.
• the locking key 150 is passed through the first fastening hole 131 of the female jig 130, it is passed through an associated second fastening hole 141. Thereby, the male jig 140 is locked to the female jig 130.
• the height adjusting nut 120 is coupled to the upper end of the male jig 140.
• a threaded part 121 is provided on the inner circumferential surface of the height adjusting nut.
• the supporter 110 is fastened to the height adjusting nut 120 through a screw-type fastening method, and is constructed so that the height of the supporter relative to the height adjusting nut 120 can be finely adjusted.
• the supporter 110 includes a head part 111, which forms the upper end of the supporter and supports a hull block thereon, and a threaded part 112, which is fastened to the threaded part 121 of the height adjusting nut 120 through a screw-type fastening method.
• the height adjusting device is installed in the female jig 130, and functions to adjust the height of the male jig 140.
• the height adjusting device is intended to minimize the consumption of human power, which is required to raise or lower the male jig 140 with the hands so as to adjust the height of the male jig 140.
• the height adjusting device includes a base plate 210, a support pin 220, a screw shaft 230, a moving plate 240, and a restoring unit 250.
• the base plate 210 is the part which is secured to the ground or the lower end in the female jig 130, and serves as the base of the height adjusting device.
• the support pin 220 functions to guide the vertical movement of the moving plate 240, which will be described below in detail.
• the support pin 220 is the pin which is supported at the lower end thereof to the upper surface of the base plate 210, and extends a long distance in the female jig 130 in the longitudinal direction thereof.
• the support pin 220 comprises two paired support pins. The support pins are supported on both sides on the upper surface of the base plate 210. This construction prevents the moving plate 240, guided by the support pins 220, from tilting to one side. That is, the two support pins 220 support respective sides of the moving plate
• the screw shaft 230 is rotatably supported at its lower end to the center of the upper surface of the base plate 210, and extends a long distance in the female jig 130 in the longitudinal direction thereof.
• a spiral groove 231 is formed in the circumferential surface of the screw shaft 230.
• the spiral groove 231 is formed such that its pitch is gradually increased in the direction from the upper end to the lower end of the screw shaft 230.
• the spiral groove 231 comprises two spiral grooves.
• the spiral grooves 231 are formed in the circumferential surface of the screw shaft 230 in such a way as to be symmetrical to each other.
• the spiral groove 231 may comprise three or more grooves. [69] As such, because the spiral groove 231 comprises a plurality of grooves, the stable movement of the moving plate 240 is possible. That is, the plurality of spiral grooves prevents the moving plate 240 from tilting to one side while the moving plate rotates the screw shaft 230.
• the moving plate 240 functions to support the bottom of the male jig 140.
• the moving plate 240 is formed such that it is smaller than the inner radius of the female jig 130 but is equal to or greater than the outer radius of the male jig 140.
• the moving plate 240 moves up and down in the female jig 130 in the longitudinal direction thereof while being supported by the support pins 220, with the two support pins 220 and the screw shaft 230 passing through the moving plate.
• moving protrusions 242 protrude from the inner circumferential surface of a first through hole 241, through which the screw shaft 230 passes, and are fitted into the corresponding spiral grooves 231 of the screw shaft 230.
• the moving protrusions allow the screw shaft 230 to be rotated as the moving plate 240 moves up and down.
• Each moving protrusion 242 comprises a rotatable bearing.
• each moving protrusion 242 moves smoothly along the corresponding spiral groove 231 of the screw shaft 230 while rotating the screw shaft 230.
• a coupling hole 245 is formed through the moving plate 240 in such a way as to extend from the outer circumferential surface of the moving plate to the first through hole 241.
• a mounting hole 246 is formed in the inner circumferential surface of the first through hole 241 in such a way as to be opposite the coupling hole 245, so that the moving protrusion 242 is mounted to the mounting hole. That is, one moving protrusion 242 is mounted in the mounting hole 246 through the coupling hole 245. Meanwhile, the other moving protrusion 242 is coupled in advance to a block 247, which is to be fastened to the coupling hole 245. Thereby, the moving protrusion is inserted into the coupling hole 245, along with the block 247.
• the spiral groove 231 comprises three grooves, as shown in FIG. 6, three moving protrusions 242 are also required.
• three coupling holes 245 are radially formed in the moving plate 240, and respective moving protrusions 242 are coupled in advance to blocks 247 which are to be fastened to corresponding coupling holes 245.
• the moving protrusions are inserted into the corresponding coupling holes 245, together with the blocks 247.
• the three moving protrusions 242 are fastened to the corresponding coupling holes 245 such that one end of each moving protrusion is fitted into an associated spiral groove 231.
• an open inlet side of each coupling hole 245 may be closed using an additional block 247.
• the support pins 220 be three in number.
• bushings 244 are installed in second through holes 243 in the moving plate
• the restoring unit 250 functions to keep the vertical moving force of the moving plate 240 constant, in cooperation with the screw shaft 230, regardless of the vertical position of the moving plate 240.
• the restoring unit 250 includes a casing 251, a restoring member 252, and a rotary shaft 253.
• the casing 251 is mounted on the upper ends of the two support pins 220, and defines a predetermined mounting space therein.
• the restoring member 252 is installed in the casing 251.
• the rotary shaft 253 functions to compress or restore the restoring member
• the upper end of the rotary shaft is rotatably supported by the upper surface of the casing 251, while the lower end of the rotary shaft is mounted to the screw shaft 230.
• the restoring member 252 comprises a spiral spring, which is supported at both ends thereof by the periphery of the rotary shaft 253 and the inner wall of the casing 251. The inside portion of the restoring member is wound around the rotary shaft 253.
• the height adjusting device of the present invention uses a relatively cheap spiral spring, and provides the screw shaft 230, which is formed such that the pitch of the spiral groove 231 is gradually increased in a direction from the upper end to the lower end of the spiral shaft.
• the moving plate 240 is always subjected to constant support force, regardless of the vertical position of the moving plate 240.
• the restoring force of the spiral spring at a proximal end is different from that of the spiral spring at a distal end.
• this difference in restoring force is compensated for by gradually changing the pitch of the spiral groove 231.
• the support force of the moving plate 240 is constant, regardless of its position.
• the female jig 130 constituting the pin jig is installed at a working site.
• the number of pin jigs and interval therebetween are determined according to the size of the curved structure (e.g. a specific hull block).
• the height of the male jig 140 and the supporter 110 of the pin jig is adjusted according to the shape of the bottom of the curved structure.
• the male jig 140 is operated to roughly adjust the height, while the supporter 110 is operated to precisely adjust the height.
• the male jig 140 moves up or down in the female jig 130 according to the shape of the curved structure, thus roughly adjusting the height of the pin jig.
• the supporter 110 is rotated clockwise or counterclockwise, thus precisely adjusting the height.
• FIG. 3 while being supported by the two support pins 220.
• each spiral groove 231, which is formed along the circumferential surface of the screw shaft 230 is gradually increased in the direction from the upper end to the lower end of the screw shaft 230, so that the rotation of the screw shaft 230 is gradually reduced.
• the curved structure (block) for forming the hull is placed on the head part 111, which forms the upper end of the supporter 110, and thereafter will be welded to another curved structure (block).

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Ocean & Marine Engineering (AREA)
• Robotics (AREA)
• Architecture (AREA)
• Structural Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
• Joining Of Building Structures In Genera (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

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ID=39644642

Family Applications (1)

Country Status (4)

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Citations (4)

Family Cites Families (1)

• 2007
  • 2007-01-23 KR KR1020070007185A patent/KR100837321B1/ko not_active IP Right Cessation
• 2008
  • 2008-01-22 CN CNA2008800028993A patent/CN101588962A/zh active Pending
  • 2008-01-22 JP JP2009547169A patent/JP2010516552A/ja not_active Withdrawn
  • 2008-01-22 WO PCT/KR2008/000388 patent/WO2008091091A1/en active Application Filing

Patent Citations (4)

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