JP2009227185A - Door carrying device and door carrying method in vehicle assembly line - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a door carrying device, in which right and left door outfit assembling work is performed as workers face each other, while total conveyor installation distance is restricted, without letting hanger's swinging or the like on one worker's side affect the work on the other worker's side. <P>SOLUTION: A primary conveyor 3 and a pair of secondary conveyors 4 are provided, and secondary hangers 16 of the respective secondary conveyors 4 can be suspended to be supported by a primary hanger 5 on the primary conveyor 3. In a specific section, the secondary hanger 16 mounting a door D is removed from a guide rail 17 of the secondary conveyor 4, and carried by the primary conveyor 3. In other sections, the secondary hangers 16 are disconnected from the primary hanger 5, and they are separately carried by the respective secondary conveyor 4. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an apparatus and method for conveying at least left and right doors as a set in a vehicle assembly line.

  In the vehicle assembly line, which is an automobile production line, the left and right doors are temporarily removed from the vehicle body in the door removal process of the main line that transports the painted vehicle body, taking into account the workability of various assembly operations. As a set, the doors are inserted into the door / subline, and in parallel with the various assembly operations for the vehicle body on the mainline, the door / subline performs the necessary outfitting and assembly work for each door. The construction method has been adopted in which the doors conveyed from the door / subline are assembled to the original body again as a left and right set.

And the thing of patent document 1 is proposed as a conveyance apparatus of the door suitable for this construction method. In patent document 1, it is an overhead conveyor type conveying apparatus for conveying the left and right doors as a set, and the secondary hanger that actually mounts the door on the primary hanger on the movable body side can be freely engaged and disengaged. It comes to support.
JP-A-5-193498

  In the technique described in Patent Document 1, the right and left doors are mounted in a so-called back-to-back state on a common secondary hanger that is suspended and supported from the primary hanger, and the door assembly is necessary for each door in the sub-line. Since the work is performed, it is not preferable because an operator may face each door individually when performing the assembling work.

  In other words, when one worker performs the outfitting / assembling work, the entire secondary hanger on which the door is mounted may shake. This is a nuisance for the workers and results in a decrease in workability. In addition, the door transfer device described above is often a power & free conveyor type and has a so-called storage function. Since the timing of running and stopping of the hanger is slightly different, this also impairs the workability.

  On the other hand, for example, if the conveyor is made independent for each of the left and right doors, this problem can be solved, but the total installation distance of the conveyor is simply doubled, which increases the size of the equipment and increases the occupied space. It is not preferable.

  The present invention has been made paying attention to such problems, and performs the assembling work of the left and right doors while facing the doors while minimizing the total installation distance of the conveyor as much as possible. Provided with a door transport device and a door transport method in a vehicle assembly line in which the shaking on one worker side or the timing of running and stopping is not affected on the work on the other worker side It is.

  The present invention temporarily removes the left and right doors from the vehicle body in the door removal process of the main line for vehicle transportation, and puts the removed left and right doors into the door sub-line as a set, while in the door attachment process of the main line, A vehicle assembly line in which the doors conveyed from the door / subline are assembled to the original vehicle body as a left / right set, and is independent for each left / right door as a component of the door conveyance device that constitutes the door / subline. A pair of secondary conveyors having a secondary carrier that can be moved and moved by mounting a single door on the right or left side, and a pair of secondary carriers for the left and right doors are mounted as a set. And a primary conveyor having a primary carrier capable of traveling.

  In at least an actual work area of the door / subline that is directly involved in the door assembly work, the secondary carrier travels and moves while the door is individually mounted on the secondary carrier of each secondary conveyor. It shall be used for assembly work.

  On the other hand, in the area other than the actual work area, the primary carrier is moved and moved with the pair of secondary carriers mounted on the primary carrier of the primary conveyor.

  According to the present invention, at least in the actual work area of the door / subline, the secondary carrier travels and moves in a state where the door is individually mounted on the secondary carrier of each secondary conveyor independent from each other. When performing the door assembling work of a door in the form of an operator facing the door, the swing of one worker side or the timing of running and stopping affects the work on the other worker side It is possible to improve workability.

  In areas other than the actual work area, the primary carrier is moved and moved with the pair of secondary carriers mounted on the primary carrier of the primary conveyor. Compared to the case, the total installation distance of the conveyor can be reduced as much as possible.

  FIG. 1 is an explanatory plan view showing a schematic structure of a vehicle assembly line in an automobile production line. Here, the vehicle assembly line is roughly classified into a main line 1 for conveying, for example, a continuous-type vehicle body B mainly composed of a slat conveyor or a conveyor for a carriage, and an overhead conveyor (for example, a chain type power and free). And a door / subline 2 for transporting the door D, which includes a primary conveyor 3 as a main element. In addition, the primary conveyor 3 comprises a door conveyance apparatus with the secondary conveyor 4 mentioned later.

  The main line 1 is used for assembling the painted vehicle body B itself. In the middle of the line, the door removal process S1 for temporarily removing the door D from the vehicle body B and the door first. A door attachment step S2 for reattaching the door D to the original vehicle body B from which D has been removed is provided.

  On the other hand, the door / subline 2 is configured as an endless line in order to perform outfitting / assembling of the door D alone, and the door / subline 2 is an actual work area including a plurality of serial processes in the middle of the door / subline 2. In addition to the sub-assembly step S13, a door loading step S11 located upstream of the door / sub-assembly step S13, and a door unloading step S12 located downstream of the door / sub-assembly step S13, The door loading step S11 is set close to the door removal step S1 on the main line 1 side, and the door unloading step S12 is set close to the door mounting step S2 on the main line 1 side.

  The door D once removed from the vehicle body B in the door removal step S1 on the main line 1 side is transferred to the door loading step S11 on the door / subline 2 side as a left and right set as will be described later. The door D, which has been put into the subline 2 and finished assembling on the door / subline 2, is transferred from the door unloading step S12 to the door mounting step S2 on the main line 1 side as a left and right set, and then the original vehicle body It will be attached to B.

  Here, while the door D set as the left and right set makes a round of the door / subline 2, the necessary assembling work is performed on each door D, while at the same time, the door D is removed on the main line 1 side. Necessary outfitting / assembling work is performed on the vehicle body B until the door attaching step S2, and the left and right doors D subjected to the outfitting assembling work are changed to the main line 1 side door attaching step S2 as described above. To be attached to the original vehicle body B.

  As described above, the door / subline 2 is mainly composed of the primary conveyor 3 which is an endless overhead conveyor. As shown in FIG. 1, in the door / sub-line 2, the door sub-assembly process S <b> 13, the door loading process S <b> 11, and the door unloading process S <b> 12 are performed separately from the primary conveyor 3. , S11, S12, and a pair of left and right secondary conveyors 4, for example, an overhead conveyor such as a power & free conveyor similar to the primary conveyor 3 are juxtaposed as the secondary conveyor 4 so as to protrude by a predetermined amount. It is.

  That is, many parts of the door subline 2 are constituted by the primary conveyor 3 which is a single overhead conveyor, whereas the door subassembly process S13, the door loading process S11, and the door unloading process S12. In each of the steps, a total of three conveyors are formed by adding a pair of left and right secondary conveyors 4 which are overhead conveyors in parallel to the primary conveyor 3.

  FIG. 2 shows details of the conveyor configuration in the door / subassembly step S13 as a representative example of the three steps of the door / subassembly step S13, the door / loading step S11, and the door / unloading step S12. FIG. 3 shows an enlarged view of FIG. 4 is an enlarged view of one hanger in FIGS. 2 and 3, and FIG. 5 is a side view of FIG.

  FIG. 7 shows a state where the door D is mounted on the hanger of FIG. 4, and FIG. 8 shows a state where the door D is mounted on the hanger of FIG.

  As shown in FIGS. 4 and 5 in addition to FIGS. 2 and 3, the primary conveyor 3, which is an overhead conveyor, has a plurality of primary hangers 5 as primary carriers arranged so as to be able to travel along the guide rails 6. An outer power chain is laid along the guide rail 6. Then, by hooking a continuously running power chain on a front trolley 10 to be described later, the primary hanger 5 follows the movement of the power chain. Further, when the front and rear primary hangers 5 and 5 come close to each other and a front trolley 10 and a rear hanger trolley 9 described later collide with each other, the engagement between the power chain and the front trolley 10 is released, and the rear primary hangers 10 are released. The hanger 5 stops at that position and exhibits a so-called storage function as a power & free conveyor. Such a structure is well known in Patent Document 2 described above.

  Here, the primary conveyor 3 does not necessarily need to be a power and free conveyor as described above, and may be, for example, a type in which the primary hanger 5 is self-propelled by driving a motor.

  In the portion corresponding to the door / sub-assembly step S13 of the primary conveyor 3, the bottom rail portion whose height is lower by one step than the general portion 6a via the inclined portions 7a and 7b before and after the guide rail 6 is a gradually changing portion. 6b. When the primary hanger 5 is transferred between the general part 6a and the bottom rail part 6b, the primary hanger 5 moves up and down by the height change between the general part 6a and the bottom rail part 6b. .

  As shown in FIGS. 4 and 5, the primary hanger 5 as a primary carrier includes a pair of front and rear hanger trolleys 8 and 9 with guide rollers supported by guide rails 6 and a front trolley 10 with guide rollers. The hanger trolley 8 and the front trolley 10 on the front side of the hanger body 11 are connected by a bar 12. A horizontal hanger plate 14 is suspended and supported from the hanger body 11 via an intermediate shaft 13, and a plurality of engaging projections 15 are formed upward on the hanger plate 14 as shown in FIG. .

  On the other hand, as shown in FIGS. 2 to 4, a pair of secondary conveyors 4 that are also overhead conveyors are arranged in parallel with the primary conveyor 3 at a position lower than the primary conveyor 3 by a predetermined amount across the primary conveyor 3. Has been. Similar to the primary conveyor 3, these secondary conveyors 4 are arranged such that a plurality of secondary hangers 16 as secondary carriers can travel along the guide rails 17, and both the secondary conveyors 4, 4. A power chain (not shown) that runs in synchronization with each other is laid along each guide rail 17. It should be noted that the position and pitch of the secondary hanger 16 are set to be substantially equal between the secondary conveyors 4 and 4. Then, by hooking a power chain that runs independently of the primary conveyor 3 side to a hanger trolley 19 described later, the secondary hangers 16 of both the secondary conveyors 4 and 4 are synchronized following the movement of the power chain. I will run. 2 and 3, from the position where the transfer of the primary hanger 5 from the general part 6a of the guide rail 6 to the bottom rail part 6b is completed, the bottom rail part 6b to the general part 6a of the guide rail 6 are also shown. It may be between the position where the transfer of the primary hanger 5 to is completed. The secondary conveyor 4 may also be of a type in which the secondary hanger 16 is self-propelled by a motor drive, for example.

  As shown in FIGS. 4 and 5, the secondary hanger 16 as a secondary carrier is a pair of front and rear hangers with guide rollers supported by guide rails 17 on top of a plate-shaped hanger body 18 that functions as a carrier body. A trolley 19 is provided, and a hanger frame 20 for directly positioning and supporting the door D to be conveyed is suspended and supported on the plate-shaped hanger body 18. A plurality of engagement holes 21 corresponding to the engagement protrusions 15 on the primary hanger 5 side are formed on the lower surface of the plate-shaped hanger body 18, and a receiving jig 22 for the door D is formed on the hanger frame 20. A pad 23 is attached. As shown in FIGS. 7 and 8, the right or left door D is erected in a rearward tilted position on each secondary hanger 16 to be positioned and supported. That is, as shown in FIGS. 4 and 5, in the state where the secondary carrier 16 on the pair of left and right secondary conveyors 4 is supported with respect to the primary carrier 5 on the primary conveyor 3 side, the same applies to both secondary conveyors 4. The secondary hangers 16 in position are in contact with the back support members 24 on the back side, and the left and right doors D are supported on the secondary hangers 16 as a set so that their outer plate faces face each other. It will be.

  Here, as shown in FIG. 6, the engagement protrusions 15 on the primary hanger 5 side and the engagement holes 21 on the secondary hanger 16 side can be disengaged from each other with so-called concavo-convex fitting. 5 and 6, if the primary hanger 5 is moved up and down in a state where the primary hanger 5 and the secondary hanger 16 are aligned in the conveying direction as shown in FIGS. The engagement projections 15 of the secondary hanger 16 and the engagement holes 21 on the side of the secondary hanger 16 are autonomously engaged or disengaged. In particular, in the engaged state of the two, the primary hanger 5 and the secondary hanger 16 are relatively positioned in the three-dimensional direction. Is autonomously performed, and the support state of each secondary hanger 16 with respect to the primary hanger 5 is stabilized.

  And in the state which the engagement protrusion part 15 by the side of the primary hanger 5 and the engagement hole 21 by the side of the secondary hanger 16 are engaging, the secondary hanger 16 was removed from the guide rail 17 by the side of the secondary conveyor 4. Even if the secondary hanger 16 is guided and supported by the guide rail 17 on the secondary conveyor 4 side, the secondary hanger 16 can be transported in a state in which the secondary hanger 16 is supported by being directly suspended. Conversely, in a state where the engagement between the engagement protrusion 15 on the primary hanger 5 side and the engagement hole 21 on the secondary hanger 16 side is released, the primary hanger 5 is in an idle state and only runs so-called idle. The secondary hanger 16 can be driven only by the power chain on the secondary conveyor 4 side on the condition that the secondary hanger 16 is guided and supported by the guide rail 17 on the secondary conveyor 4 side.

  The structure as described above is basically the same not only for the door sub-assembly process S13 but also for the door loading process S11 and the door unloading process S12. However, since the amount of work in the door / subassembly step S13 is much larger than that in the door loading step S11 and the door unloading step S12, the length of the section where the secondary hanger 16 travels alone is The door sub-assembly step S13 is set to be overwhelmingly longer than the door loading step S11 and the door unloading step S12.

  Therefore, for example, when attention is paid to the primary hanger 5 and the secondary hanger 16 at the left end in FIGS. 2 and 3, the engagement protrusion 15 on the primary hanger 5 side and the engagement hole 21 on the secondary hanger 16 side described above Since the pair of left and right secondary hangers 16 are supported by hanging directly on the primary hangers 5 with the engagement, the secondary hangers 16 come off the guide rails 17 of the secondary conveyor 4 itself as shown in FIGS. The secondary hanger 16 is conveyed with the movement of the primary conveyor 3.

  Then, when the primary hanger 5 at the left end of the figure reaches the start end of the secondary conveyor 4, the roller of the hanger trolley 19 of the secondary hanger 16 supported by being suspended from the primary hanger 5 is guided by the guide rail of the secondary conveyor 4. 17, the secondary hanger 16 is guided and supported by the guide rail 17 of the secondary conveyor 4 (see the first primary hanger 5 from the left in FIGS. 2 and 3). Alternatively, as shown in FIGS. 7 and 8, the secondary hanger 16 is conveyed while being supported by being suspended from the primary hanger 5.

  Eventually, as shown in FIGS. 2 and 3, when the primary hanger 5 is transferred from the general portion 6a to the bottom rail portion 6b of the guide rail 6 on the primary conveyor 3 side (the first primary hanger 5 from the left in FIGS. 2 and 3). The height of the secondary hanger 16 guided and supported by the guide rail 17 on the secondary conveyor 4 side is not changed, whereas the primary hanger 5 is a general part of the guide rail 6 on the primary conveyor 3 side. 6a and the bottom rail portion 6b are lowered by the height displacement. As the primary hanger 5 descends, the engagement between the engagement protrusion 15 on the primary hanger 5 side and the engagement hole 21 on the secondary hanger 16 side is autonomously released as shown in FIG. Thus, the primary hanger 5 and the secondary hanger 16 are so-called bordered. Thereafter, the primary hanger 5 runs alone, but instead, the secondary hanger 16 runs alone by being pulled by the power chain on the secondary conveyor 4 side as shown in FIGS. In this case, as is apparent from a comparison between FIG. 12 and FIG. 13, the pair of left and right secondary conveyors 4 edged with the primary conveyor 3 increases the interval between the pair of secondary conveyors 4 as necessary. be able to.

  Further, as shown in FIGS. 2 and 3, at the position corresponding to the position at which the transfer of the primary hanger 5 from the bottom rail portion 6b to the general portion 6a is completed in the guide rail 6 on the primary conveyor 3 side, it is alone until then. The secondary hanger 16 on the side of the secondary conveyor 4 that has traveled is set to stop traveling. When the transfer of the primary hanger 5 from the bottom rail portion 6b to the general portion 6a of the guide rail 6 on the primary conveyor 3 side is completed as described above for the secondary hanger 16 waiting at the same position, While the height of the secondary hanger 16 supported and supported by the guide rail 17 on the secondary conveyor 4 side is unchanged, the primary hanger 5 is generally connected to the bottom rail portion 6b of the guide rail 6 on the primary conveyor 3 side. The ascending operation is performed by the height displacement of the portion 6a. As the primary hanger 5 moves up, the primary hanger 5 side engaging protrusion 15 and the secondary hanger 16 side engaging hole 21 are autonomously engaged again as shown in FIGS. Accordingly, the secondary hanger 16 is suspended and supported by the primary hanger 5. Thereafter, regardless of whether or not the secondary hanger 16 is guided and supported by the guide rail 17 on the secondary conveyor 4 side (the state shown in FIGS. 7 and 8 or FIGS. 9 and 10), the secondary hanger 16 is the primary hanger. It is conveyed in a state of being supported by being suspended by 5.

  In this embodiment, in many parts of the door subline 2 except the door / subassembly step S13, the door loading step S11, and the door unloading step S12, as shown in FIGS. The secondary hanger 16 is removed from the guide rail 17, and the secondary hanger 16 is conveyed while being suspended and supported by the primary hanger 5 on the primary conveyor 3 side, while the door sub-assembly step S13 and the door loading are carried out. In each of the process S11 and the door / unloading process S12, the secondary hanger 16 of the secondary conveyor 4 is separated from the primary hanger 5 of the primary conveyor 3 as shown in FIG. After the secondary hanger 16 is guided and supported by the guide rail 17 of the secondary conveyor 4, It is characterized in that for conveying in a conveyor 4 alone.

  Next, a series of movements of the conveyance mode in the door / subline S2 configured as described above will be described in order.

  As shown in FIG. 1, at least two parts of the door subline 2 are between the door loading step S11 and the door subassembly step S13 and between the door subassembly step S13 and the door unloading step S12. Since it is a part which actually conveys the door D together with the next hanger 16 (with the primary hanger 5 and the secondary hanger 16 depending on the part), it is indicated by a solid line, and from the other door unloading step S12 to the door loading step S11 The interval is a portion that conveys only the primary hanger 5 and the secondary hanger 16 in order to forward the primary hanger 5 and the secondary hanger 16 in the empty state, and is indicated by a broken line.

  When the vehicle body B reaches the door removal step S1 of the main line 1 in FIG. 1, the operator removes the left and right doors D from the vehicle body B, and the door loading step S11 on the side of the door / subline 2 close to the door removal step S1. 7, the doors D are transferred to the secondary hanger 16 waiting in the same process in a posture as shown in FIGS. The relationship between the primary conveyor 3 and the secondary conveyor 4 in the door loading step S11 is as shown in FIGS. 2 and 3, and the transfer operation of the door D as described above is at least a secondary hanger separated from the primary hanger 5. 16 may be completed while traveling alone as shown in FIG. The secondary hanger 16 on which the left and right doors D are mounted as a set as shown in FIG. 11, 12 or 13 passes through the state shown in FIGS. 7 and 8, and eventually the primary hanger 3 side as shown in FIGS. 9 and 10. The suspension is supported by the primary hanger 5 and finally transported to the door / subassembly step S13, which is a subsequent step, with the movement of only the primary conveyor 3.

  The relationship between the primary conveyor 3 and the secondary conveyor 4 in the door / subassembly step S13 is as shown in FIGS. 2 and 3, and the secondary hanger 16 separated from the primary hanger 5 runs alone as shown in FIGS. During this process, the assembling work for the left and right doors D is performed in a plurality of steps. In this case, in the portion other than the start / end portion of the door / subassembly step S13 (the portion where the secondary hanger 16 is separated from the primary hanger 5 and the secondary hanger 5 is transferred to the primary hanger 5), FIG. As described above, the distance between the guide rails 17 and 17 of both the secondary conveyors 4 can be widened and the secondary hangers 16 facing each other can be pulled apart so as not to contact each other. is there.

  And as shown in FIGS. 11 and 12, since the left and right doors D are positioned and supported in a standing posture so that the outer plate surfaces face each other as a set on both secondary hangers 16 that run synchronously, The operator stands on the door D so as to face the door D, and the necessary outfitting / assembling work is performed on the door D alone.

  Here, when one worker performs the outfitting and assembling work, the entire secondary hanger 16 on which the door D is mounted may shake, but when the secondary hangers 16 are separated from each other as shown in FIG. The shaking associated with the outfitting / assembling operation of one door D does not cause trouble for the other operator who is performing the outfitting / assembling operation of the opposite door D. Further, as described above, when the power & free conveyor type is used as the secondary conveyor 4 and has a so-called storage function, the traveling of the secondary hanger 16 necessary for each worker and Even if the stop timing is slightly different, the effect on workability due to this is avoided.

  Thereafter, when the left and right secondary hangers 16 reach the end of the door / sub-assembly step S13 of FIGS. 2 and 3, the secondary hangers 16 mounted with the left and right doors D are in the state shown in FIGS. 9 and 10 are eventually suspended and supported by the primary hanger 5 on the side of the primary conveyor 3 as shown in FIGS. 9 and 10, and finally, the movement of only the primary conveyor 3 moves to the door unloading step S12 which is a subsequent step. Be transported.

  When the left and right doors D that have finished the outfitting / assembling work reach the door / unloading step S12 as a set, the original vehicle body B to which these doors D are to be attached has reached the door mounting step S2 of the main line 1. Therefore, the operator transfers the left and right doors D that have been subjected to the outfitting and assembling work from the pair of secondary hangers 16 that are waiting, and then attaches the doors D to the forward dimension vehicle body B. The relationship between the primary conveyor 3 and the secondary conveyor 4 in the door unloading step S12 is as shown in FIGS. 2 and 3, and the transfer operation of the door D as described above is at least as shown in FIGS. It may be completed while the secondary hanger 16 separated from the primary hanger 5 is traveling alone. Then, the secondary hanger 16 that has been placed in the empty state is supported by being suspended from the primary hanger 5 on the primary conveyor 3 side as shown in FIGS. Is forwarded to the door loading step S11 with the movement of the primary conveyor 3 only.

  Thus, according to the present embodiment, the primary conveyor 3 and the pair of secondary conveyors 4 are arranged side by side in addition to the door sub-assembly process S13, the door loading process S11, and the door unloading process. Since only the loading step S12 and the primary conveyor 3 is laid alone in other portions, the total installation distance of the conveyor can be shortened, and the occupied space required for door conveyance can be greatly reduced. become.

  In addition, the transfer of the pair of secondary hangers 16 to the single primary hanger 5 and the separation of the pair of secondary hangers 16 from the single primary hanger 5 include the general portion 6a and the bottom rail portion 6b of the guide rail 6. Therefore, there is an advantage that a power mechanism for transferring and separating the secondary hanger 16 is not required.

  Furthermore, as shown in FIG. 13, the secondary hangers 16 can be separated from each other by separating the distance between the pair of secondary conveyors 4 as necessary. Even when a different worker performs each, the swing of one secondary hanger 16 or the like does not hinder the assembling work of the door D mounted on the other secondary hanger 16.

  FIG. 14 shows a modification of FIG. 6 as the second embodiment of the present invention.

  In the second embodiment, a guide roller 30 is attached to a part of the intermediate shaft 13, and a tapered surface 18 a is formed on the lower surface of the hanger body 18 to transfer the secondary hanger 16 to the primary hanger 5. The guide roller 30 is inserted into the opposing gap between the left and right hanger bodies 18 while rolling, and the hanger bodies 18 of the secondary hanger 16 and the hanger body 18 and the hanger plate 14 are relatively positioned. The pin-shaped engagement protrusion 15 and the engagement hole 21 are engaged with each other.

  FIG. 15 shows a modification of the portion B in FIG. 14 as the third embodiment of the present invention.

  In the third embodiment, instead of the guide roller 30 of FIG. 14, a large-diameter portion 32 having a tapered seat surface 32a in which a steel ball 31 is embedded in a part of the intermediate shaft 13 is formed. The large-diameter portion 32 is finally inserted into the gap between the left and right hanger bodies 18 while sliding the surface 32a and the tapered surface 18a, and the hanger bodies 18 of the secondary hanger 16 and the hanger body 18 and the hanger. The pin-like engagement protrusion 15 and the engagement hole 21 are engaged with each other while performing relative positioning with the plate 14.

  According to these second and third embodiments, the friction between the intermediate shaft 13 and the hanger body 18 is reduced, and the engagement between the engagement protrusion 15 and the engagement hole 21 is more stable. And has the advantage of being done smoothly.

  FIG. 16 shows a modification of FIG. 6 as the fourth embodiment of the present invention.

  In the fourth embodiment, instead of the engagement protrusion 15 and the engagement hole 21 of FIG. 6, the upper surface of the hanger plate 14 and the lower surface of the hanger body 18 are respectively provided with serrated uneven engagement surfaces 33 and 34. It is a thing.

  According to the fourth embodiment, when the secondary hanger 16 is transferred to the primary hanger 5, even if both have a slight relative position error in the door conveyance direction, the error is absorbed. There is an advantage that the secondary hanger 16 can be reliably transferred to the primary hanger 5 by engaging the concave and convex portions.

  FIG. 17 shows a fifth embodiment of the present invention.

  In the first to fourth embodiments so far, as shown in FIGS. 2 and 3, the guide rail 6 constituting the primary conveyor 3 has a bottom rail portion 6b that is one step lower than the general portion 6a. The primary hanger 5 moves up and down by the height change between the general part 6a and the bottom rail part 6b, so that the secondary hanger 16 is transferred from the primary hanger 5 to the secondary conveyor 4 on the primary conveyor 3 side. In the fifth embodiment shown in FIG. 17, the secondary hanger 16 is transferred from the secondary conveyor 4 side to the primary hanger 5 on the primary conveyor 3 side. Such an elevating operation of the primary hanger 5 is unnecessary.

  FIG. 17 is an enlarged view of a portion corresponding to the portion A in FIG. 5, and the guide rail 6 of the primary conveyor 3 has inclined portions 7 a and 7 b and a bottom rail portion 6 b as shown in FIGS. Instead, it is set at a height position where the hanger body 18 of the secondary hanger 16 can be relatively moved while sliding on the hanger plate 14 on the primary hanger 5 side. On the hanger plate 14 on the primary hanger 5 side, for example, a lock plate 41 that is rotatable by the operation of a rotary actuator 40 is provided. The lock plate 41 is formed with an engagement protrusion 42, while the hanger body 18 of the secondary hanger 16 is formed with an engagement hole 43 that can be engaged with the engagement protrusion 42.

  Therefore, when the secondary hanger 16 is transferred to the primary hanger 5, the lock plate 41 is rotationally displaced as indicated by the solid line after matching the positions in the traveling direction as shown in FIG. Then, the engagement protrusion 42 on the lock plate 41 side is engaged with the engagement hole 43 on the hanger body 18 side of the secondary hanger 16. As a result, the secondary hanger 16 is transferred to the primary hanger 5 and, at the same time, the relative positioning in the three-dimensional direction is performed, and the two are coupled.

  On the other hand, when separating the two, the lock plate 41 is reversely rotated to the imaginary line position to release the engagement between the engagement protrusion 42 and the engagement hole 43, and then the secondary hanger 16 is moved. What is necessary is just to run and move in the direction away from the primary hanger.

  Also in the fifth embodiment, functions equivalent to those of the first embodiment are exhibited.

BRIEF DESCRIPTION OF THE DRAWINGS Plan explanatory drawing which shows schematic structure of a vehicle assembly line among the production lines of a motor vehicle as a 1st Embodiment of this invention. Explanatory drawing which shows the conveyor structure of the door sub-assembly process in FIG. The enlarged view of FIG. Explanatory drawing which shows the relationship between a set of primary hangers and a secondary hanger as the principal part enlarged view of FIGS. Side surface explanatory drawing of FIG. The A section enlarged view of FIG. Explanatory drawing which shows the state which mounted the door on the secondary hanger of FIG. Explanatory drawing which shows the state which mounted the door on the secondary hanger of FIG. Explanatory drawing which shows the state currently conveyed with the primary conveyor in the state which supported the pair of secondary hanger mounted with the door on either side with the primary hanger. Side surface explanatory drawing of FIG. Explanatory drawing which shows the state in which a pair of secondary hanger mounted with the left and right doors is conveyed by the secondary conveyor alone. Side surface explanatory drawing of FIG. Explanatory drawing which shows the state which expanded the space | interval of both primary conveyors rather than the state of FIG. Explanatory drawing which shows the modification of FIG. 6 as the 2nd Embodiment of this invention. Explanatory drawing which shows the modification of the B section of FIG. 14 as the 3rd Embodiment of this invention. The principal part explanatory drawing which shows another modification of FIG. 6 as the 4th Embodiment of this invention. The principal part explanatory drawing which shows the further modification of FIG. 6 as the 5th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Main line 2 ... Door sub-line 3 ... Primary conveyor 4 ... Secondary conveyor 5 ... Primary hanger as primary carrier 6 ... Guide rail 6a ... General part 6b ... Bottom rail part 7a, 7b ... Inclined part 11 ... Hanger body 14 ... Hanger plate 15 ... engagement protrusion 16 ... secondary hanger as secondary carrier 17 ... guide rail 18 ... hanger body as carrier body 20 ... hanger frame 21 ... engagement hole B ... vehicle body D ... door S1 ... door removal Process S2 ... Door mounting process S11 ... Door loading process S12 ... Door unloading process S13 ... Door subassembly process as actual work area

Claims (13)

In the door removal process of the main line for car body transportation, the left and right doors are temporarily removed from the car body, and the removed left and right doors are put into the door / subline as a set. In the vehicle assembly line where the transported door is assembled to the original car body as a left and right set,
The structure of the door conveyance device constituting the door subline,
A pair of secondary conveyors having a secondary carrier that is independent for each of the left and right doors and that is mounted with a single door on the right or left side and is movable.
A primary conveyor having a primary carrier that can be traveled by mounting a pair of secondary carriers for the left door and the right door as a set;
With
In the actual work area that is directly involved in the door assembly work among the doors and sub-lines, the secondary carrier travels and moves while the door is individually mounted on the secondary carrier of each secondary conveyor. While working,
In the area other than the actual work area, the primary carrier is moved and moved while the pair of secondary carriers are mounted on the primary carrier of the primary conveyor. . At the starting end of the actual work area, the pair of secondary carriers mounted on the primary carrier's primary carrier in a door-mounted state are transferred to a separate secondary conveyor for each left and right door,
2. The vehicle assembly according to claim 1, wherein a pair of secondary carriers is transferred from each secondary conveyor to the primary carrier of the primary conveyor as a set at the end of the actual work area. Door transport device in line. The door sub-line includes a door loading process for loading a door to each secondary carrier on the upstream side of the actual work area, and a door / unloader that lowers the door from each secondary carrier on the downstream side of the actual work area. With a loading process,
Also between the door loading process and the actual work area and between the actual work area and the door unloading process, the primary carrier is mounted with a pair of secondary carriers mounted on the primary carrier of the primary conveyor. The door conveyance device in the vehicle assembly line according to claim 2, wherein the door conveyance device is adapted to travel and move. Also in the door loading process and door unloading process, a pair of secondary carriers mounted as a set on the primary carrier's primary carrier in a door-mounted state are independent for each of the left and right doors. While transferring to the secondary conveyor,
4. A door in a vehicle assembly line according to claim 3, wherein a pair of secondary carriers are transferred from each secondary conveyor to the primary carrier of the primary conveyor as a set at the terminal portion. Conveying device. The door conveying apparatus in the vehicle assembly line according to any one of claims 1 to 4, wherein the primary conveyor is a single one.   The door conveying device in the vehicle assembly line according to any one of claims 2 to 5, wherein the primary conveyor and the pair of secondary conveyors are both overhead type power and free conveyors. Of the primary conveyor and the pair of secondary conveyors, at least a portion where the secondary carrier is transferred from the primary carrier on the primary conveyor side to the secondary conveyor side, and the secondary carrier is transferred from the secondary conveyor side to the primary carrier on the primary conveyor side. In the mounted part, the guide rail on the primary conveyor side for guiding the primary carrier and the guide rail on the secondary conveyor side for guiding the secondary carrier are parallel to each other in plan view,
As the primary carrier descends by a predetermined amount along the guide rail on the primary conveyor side, the secondary carrier is autonomously transferred from the primary carrier on the primary conveyor side to the secondary conveyor side,
On the other hand, when the primary carrier rises by a predetermined amount along the guide rail on the primary conveyor side, the secondary carrier is autonomously transferred from the secondary conveyor side to the primary carrier side primary carrier. The door conveyance apparatus in the vehicle assembly line of Claim 6 characterized by the above-mentioned. When the secondary carrier is transferred from the primary carrier on the primary conveyor side to the secondary conveyor side, the relative positioning in both three-dimensional directions is autonomously released,
8. When the secondary carrier is transferred from the secondary conveyor side to the primary carrier side primary carrier, the relative positioning in both three-dimensional directions is autonomously performed. The door conveyance device in the vehicle assembly line described in 1.   9. The door conveyance device in a vehicle assembly line according to claim 8, wherein the relative positioning of the primary carrier and the secondary carrier in the three-dimensional direction is performed by engaging the concave and convex portions.   10. The door assembling work in the door / subline is performed in parallel with the vehicle assembling work for the vehicle body from which the door is removed in the main line. Door transport device in the vehicle assembly line. The secondary carrier is
The carrier body,
A hanger frame that is suspended and supported by the carrier body and directly supports the door,
The door conveying apparatus in the vehicle assembly line in any one of Claims 1-10 characterized by the above-mentioned.   The left and right doors are supported back-to-back with the door outer surface inside, in a state in which a pair of secondary carriers in a door-mounted state are mounted on the primary carrier of the primary conveyor. Item 12. A door conveyance device in a vehicle assembly line according to any one of Items 1 to 11. In the door removal process of the main line for car body transportation, the left and right doors are temporarily removed from the car body, and the removed left and right doors are put into the door / subline as a set. In the vehicle assembly line where the transported door is assembled to the original car body as a left and right set,
A method of transporting a door with a door transport device that constitutes the door subline,
A pair of secondary conveyors having a secondary carrier that is independent for each of the left and right doors and that is mounted with a single door on the right or left side and is movable.
A primary conveyor having a primary carrier that can be traveled by mounting a pair of secondary carriers for the left door and the right door as a set;
With
In the actual work area that is directly involved in the door assembly work among the doors and sub-lines, the secondary carrier travels and moves while the door is individually mounted on the secondary carrier of each secondary conveyor. While working,
A door conveying method in a vehicle assembly line, wherein the primary carrier is moved and moved in a state where a pair of secondary carriers is mounted on the primary carrier of the primary conveyor in an area other than the actual work area.

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