JP4016971B2 - Bolt temporary storage facility using shuttle conveyor - Google Patents

Description

  The present invention relates to a temporary bolt placement facility using a shuttle conveyor that is preferably used in, for example, an assembly process of machine parts.

  A differential equipped in a drive shaft of an automobile includes a housing 1 and a differential carrier 2 as shown in FIG. Axle tubes 3 are provided on both sides of the housing 1. A circular opening 4 is formed on the end surface of the housing 1, and a plurality of bolts 5 are provided at a peripheral pitch of the opening 4 at a predetermined pitch in the circumferential direction. These bolts 5 protrude from the end face of the housing 1.

  The bolt 5 is used to fasten the differential carrier 2 to the housing 1. Each bolt 5 is temporarily placed in a bolt insertion hole 6 formed in the housing 1 and is carried into a bolt press-fitting machine, and is press-fitted into the bolt insertion hole 6 from the inside of the housing 1 by the bolt press-fitting machine. For this reason, before the bolts 5 are press-fitted into the bolt insertion holes 6, the work of inserting all the bolts 5 into the bolt insertion holes 6 of the housing 1 by hand is performed in advance. This operation is referred to as a bolt temporary placement operation in this specification.

  After carrying out the above-described bolt temporary placement operation, the housing 1 may be placed on the pallet 7 as shown in FIG. 16 in order to transport the housing 1 to the bolt press-fitting machine. In that case, it is necessary to insert all the bolts 5 protruding to the lower surface side of the housing 1 into the bolt receiving holes 8 of the pallet 7. For this reason, it is necessary to lift the housing 1 one by one by a hoisting machine and to insert all the bolts 5 into the bolt receiving holes 8 while positioning all the bolts 5 with respect to the bolt receiving holes 8 of the pallet 7. For this reason, not only does it take time to temporarily place the bolt, but it is also a work that requires labor.

  In addition, the work stage such as the temporary bolt placement stage needs to be provided at a position sufficiently away from the main conveyor in order to ensure the safety of the worker. The operation of returning the housing 1 after the temporary placement of the bolts from the temporary placement stage of the bolts onto the main conveyor again takes time and labor.

  Accordingly, an object of the present invention is to provide a temporary bolt placement facility including a shuttle conveyor that can easily perform temporary bolt placement work.

The bolt temporary placement facility according to the present invention as described in claim 1 is provided on a main conveyor, and a workpiece receiving stage and a workpiece return stage for delivering a pallet on which a housing of a differential machine as a workpiece is placed. And a temporary bolt placement facility having a temporary bolt placement stage for inserting a bolt into a bolt insertion hole at a peripheral edge of the opening of the workpiece provided on the sub-conveyor side apart from the main conveyor, the work receiving stage and the workpiece back stage and the between the bolt temporary stage reciprocates and for a liftable shuttle arm up and down the chromatic vital the shuttle arm while holding the pallet the workpiece is placed a shuttle conveyor having a lifting mechanism, movable up and down on the bolt temporary stage The pallet held by the shuttle arm and a support part that receives the axle tube of the work when the work is lowered integrally with the shuttle arm, and the work is supported by the support part in a state where the work is supported by the support part. A temporary holder on which the bolt is inserted into each of the bolt insertion holes; a temporary holder raising / lowering mechanism for raising and lowering the temporary holder; and a bolt temporary insertion stage movably provided in the vertical direction. The workpiece into which the bolt is inserted is lowered by the temporary support raising / lowering mechanism so that the workpiece enters the sub-conveyor and enters the opening of the workpiece while the workpiece is centered. And a guide member for lowering the guide member to a lowered position that does not interfere with the movement path of the pallet. Guide member is provided with a mechanism to keep the state of being raised the guide member when it enters the opening of the workpiece. The work held by the shuttle conveyor is lowered integrally with the shuttle arm on the temporary bolt placing stage, and the work is placed on the temporary receiving base during the lowering. As the shuttle arm further descends, the pallet gets on the sub-conveyor. In this state, the bolt is temporarily placed in the bolt insertion hole of the workpiece, and the sub ring is placed on the pallet body as necessary. After that, when the temporary cradle is lowered, the work is lowered toward the pallet, and the work is placed on the pallet while the guide member enters the opening of the work and the work is centered. For this reason, the position of the bolt projecting from the workpiece matches the position of the bolt receiving hole of the pallet, and each bolt is inserted into the bolt receiving hole of the pallet .

  The workpieces thus placed on the pallet are conveyed to the workpiece dispensing stage by the sub-conveyor. In this work dispensing stage, the shuttle arm is inverted and is in the second turning position, and after the pallet is received by the shuttle arm, the work is transferred toward the work return stage on the main conveyor side.

  An example of the shuttle conveyor is configured as described in claim 2, and the shuttle body holds the pallet on which the workpiece is placed by the shuttle arm, and the shuttle traveling mechanism transfers the pallet on which the workpiece is placed. The workpiece receiving stage and workpiece return stage to be moved, and the bolt temporary placement stage for performing work on the workpiece placed on the pallet are reciprocated. The shuttle arm is in the first turning position when moving forward from the workpiece receiving stage to the bolt temporary placement stage.

  When the return path moves from the temporary bolt placement stage to the work return stage, the shuttle arm reverses to the second turning position, thereby receiving the work pallet from the sub-conveyor and transporting it to the main conveyor. The shuttle arm may have a positioning part such as a convex part that can support a predetermined position of the edge of the pallet at any of the above-mentioned turning positions. The shuttle arm is driven up and down by a lifting mechanism, and the shuttle arm moves to the bottom of the conveyor when delivering the pallet to the main conveyor. Further, when the shuttle body traverses between the workpiece receiving stage, the workpiece return stage, and the bolt temporary placement stage, the shuttle arm is raised to the conveyance height by the lifting mechanism.

  According to the temporary bolt mounting facility described in claim 1, the workpiece can be separated from the pallet by a simple operation of dropping the workpiece together with the pallet by the shuttle conveyor, and the temporary bolt mounting operation of the workpiece can be performed. At the same time, a sub ring can be placed on the pallet. When the temporary support is lowered, the work can be centered by the guide member, and the bolt is automatically positioned with respect to the bolt receiving hole of the pallet. In this way, it is possible to automate the transfer of the workpiece onto the pallet, and the temporary placement operation of the bolt can be performed easily and quickly.

  According to the shuttle conveyor of the second aspect, the shuttle arm of the shuttle body that reciprocates between the workpiece receiving stage, the workpiece return stage, and the bolt temporary placement stage is reversed between the forward movement and the backward movement. Thus, the workpiece can be moved along the pallet by switching the movement path of the workpiece according to the direction of the shuttle arm. For this reason, while using one shuttle conveyor, shuttle conveyance associated with the movement of the main conveyor and the sub-conveyor is possible.

  Hereinafter, a temporary bolt installation facility 10 according to an embodiment of the present invention will be described with reference to the accompanying drawings. 1 (plan view), a temporary bolt placement facility 10 is a main conveyor 11 that conveys a housing 1 of a vehicle differential as an example of a workpiece, and a temporary bolt placement from a workpiece receiving stage T1 of the main conveyor 11. Shuttle conveyor 12 that reciprocates between stage (working stage) T2 and between workpiece discharge stage T3 and workpiece return stage T4, work guide mechanism 13 provided on bolt temporary placement stage T2, and bolt temporary placement stage T2. To a workpiece dispensing stage T3, a pallet 15 for mounting the housing 1, and the like.

  The workpiece receiving stage T1 and the workpiece returning stage T4 are provided on the main conveyor 11 for delivering the pallet 15 on which the housing 1 is placed. The bolt temporary placement stage T2 as the work stage is disposed on the side of the sub-conveyor 14 so as to be separated from the main conveyor 11 in order to work on the housing 1 placed on the pallet 15.

  The main conveyor 11 is moved by the conveyor driving mechanism 11a (partially shown in FIG. 3) in the direction indicated by the arrow F1 in FIGS. The housing 1 mounted on the pallet 15 is conveyed in the F1 direction with the axle tube 3 protruding on both sides of the main conveyor 11 and the opening 4 facing downward.

  As shown in FIG. 2, the main conveyor 11 is installed almost horizontally on the conveyor frame 16. A pallet return conveyor 17 is provided below the main conveyor 11. The pallet return conveyor 17 moves in the direction opposite to the conveyance direction of the main conveyor 11 (the direction indicated by the arrow R in FIG. 2), and has a function of returning the following pallet 15 to the conveyance upstream side of the main conveyor 11.

  FIG. 4 shows an example of the pallet 15. The pallet 15 includes a pallet main body 15a and a detachable sub-ring 15b provided on the pallet main body 15a as necessary. A bracket 20 for regulating the approximate position of the housing 1 is provided on the upper surface side of the pallet main body 15a, and the housing 1 can be held in a horizontal posture as shown in FIG. A circular opening 21 is formed at the center of the pallet main body 15a, and a plurality of bolt receiving holes 22 are provided around the opening 21 at a predetermined pitch. The bolt receiving hole 22 has an inner diameter through which the bolt 5 can be inserted, and penetrates the pallet main body 15a in the vertical direction.

  The sub-ring 15b is placed at a predetermined position on the pallet body 15a according to the type of the housing 1 in a bolt temporary placement stage T2 described later. A circular opening 25 is also formed at the center of the sub-ring 15b, and a plurality of bolt receiving holes 26 are provided around the opening 25 at a predetermined pitch. These bolt receiving holes 26 also have inner diameters through which the bolts 5 can be inserted, and each bolt receiving hole 26 passes through the sub ring 15b in the vertical direction. An identification unit 27 such as an ID card in which data capable of identifying the type of the housing 1 is recorded is provided in a part of the pallet body 15a.

  A positioning hole 30 is formed at a predetermined position of the pallet main body 15a. By inserting the following location pin 121 (shown in FIG. 11) provided on the bolt temporary placement stage T2 into the positioning hole 30 from below, the position of the pallet body 15a on the bolt temporary placement stage T2 is regulated. It is like that.

  The shuttle conveyor 12 that reciprocates between the workpiece receiving stage T1 and the bolt temporary placement stage T2 and between the workpiece dispensing stage T3 and the workpiece return stage T4 is a housing 1 that has been conveyed to the workpiece receiving stage T1 by the main conveyor 11. For transferring the pallet 15 to the temporary bolt placement stage T2 and returning the workpiece on the main conveyor 11 from the workpiece discharge stage T3 while the housing 1 in which the bolt 5 is temporarily placed in the temporary bolt placement stage T2 is placed on the pallet 15. It is responsible for returning to stage T4.

  The shuttle conveyor 12 is configured as shown in FIGS. This shuttle conveyor 12 has a frame structure 37 constructed from a horizontal frame 35 extending in the horizontal direction and a vertical frame 36 (shown in FIG. 2) that supports the horizontal frame 35 on the floor side of the factory. As shown in FIG. 1 and the like, the horizontal frame 35 extends in a direction orthogonal to the conveying direction F1 of the main conveyor 11 toward the temporary bolt placement stage T2 located on the side of the main conveyor 11. The shuttle main body 40 is configured to reciprocate in the horizontal direction along the horizontal frame 35.

  A shuttle travel mechanism 41 for moving the shuttle body 40 includes a rack 42 (shown in FIG. 7) provided in the horizontal direction along the horizontal frame 35, a gear 43 that meshes with the rack 42, and a motor 44 that rotates the gear 43. And a transverse guide 45 parallel to the rack 42. The motor 44 is mounted on the shuttle main body 40. By rotating the gear 43 by the motor 44, the shuttle main body 40 can reciprocate between the workpiece receiving stage T1 and the bolt temporary placement stage T2. It has become.

  The shuttle body 40 includes a movable base 50 that moves in the horizontal direction along the traversing guide 45, a lifting body 51 provided at a lower portion of the movable base 50, and a lifting mechanism 53 having an actuator 52 for lifting the lifting body 51. The elevating body 51 is configured to include a pair of left and right guide rods 54 for guiding the vertical movement of the elevating body 51 so that the elevating body 51 can move straight in the vertical direction.

  The actuator 52 is a dual cylinder type in which two fluid pressure cylinders 52a and 52b are connected in series, and when both the cylinders 52a and 52b are operated to the extension side, shuttle arms 61 and 62, which will be described later, The shuttle arms 61 and 62 are moved up to the rising end, that is, the conveyance height H when the cylinders 52a and 52b are both moved to the contraction side when lowered to a position L lower than the sub-conveyor 14. Further, in a state where one cylinder 52a is operated to the expansion side and the other cylinder 52b is operated to the contraction side, the shuttle arms 61 and 62 are lowered to the intermediate height, that is, the position M slightly lower than the main conveyor 11.

  The elevating body 51 includes a pair of left and right shuttle arms 61 and 62. These shuttle arms 61 and 62 can be swung within a range of 180 ° in a horizontal plane in synchronism with each other around a vertical axis 64 by a rotary actuator 63. That is, the shuttle arms 61 and 62 pass through the neutral position N indicated by the two-dot chain line from the first turning position facing the front side of the shuttle body 40 as shown in FIG. 8, and as shown in FIG. It is configured to be able to reciprocately rotate over a second turning position that is turned 180 ° toward the back side. The rotary actuator 63 constitutes a turning mechanism 65 for turning the shuttle arms 61 and 62.

  Each of the shuttle arms 61 and 62 is provided with a pair of front and rear support members 66 and 67 extending in the horizontal direction. At both ends of these support members 66 and 67, upward convex portions 70 and 71 functioning as positioning portions capable of supporting both side edges 68 of the pallet 15 are provided. On both side edges 68 of the pallet 15, concave portions (not shown) are formed so that the convex portions 70 and 71 can be engaged from below, and the convex portions 70 and 71 are formed on the pallet. By fitting from below 15, the pallet 15 is supported horizontally on the shuttle arms 61 and 62 in a state where the position of the pallet 15 with respect to the shuttle arms 61 and 62 is regulated.

  More specifically, when the shuttle arms 61 and 62 are in the first swiveling position shown in FIG. 8, the convex portion 70 located on one end side of the support members 66 and 67 supports the edge 68 of the pallet 15, and the shuttle When the arms 61 and 62 are reversed to the second turning position shown in FIG. 9, the convex portion 71 located on the other end side of the support members 66 and 67 supports the edge portion 68 of the pallet 15. . When it is not necessary to support the pallet 15, the shuttle arms 61 and 62 can be stopped at the neutral position N by operating the stopper mechanism 72.

  Next, the bolt temporary placement stage T2 will be described with reference to FIGS. The bolt temporary placement stage T2 carries out the workpiece guide mechanism 13 for centering the housing 1 and the housing 1 on which the bolt 5 is temporarily placed to the workpiece dispensing stage T3 in order to assist the worker in temporarily placing the bolt. A sub-conveyor 14 is provided.

  More specifically, the work guide mechanism 13 includes a temporary receiving portion 81 having a pair of left and right temporary receiving bases 80 for supporting the axle tube 3 of the housing 1 from the lower side, and a centering located inside these temporary receiving bases 80. A (centering) guide portion 82 and a pallet positioning mechanism 83 for positioning the pallet 15 are provided.

  The temporary holder 81 includes the temporary holder 80 and a temporary holder raising / lowering mechanism 85 using a ball screw mechanism for raising and lowering the temporary holder 80. The temporary cradle raising / lowering mechanism 85 includes a lead screw 86 extending in the vertical direction, a part of which is shown in FIG. 12 and the like, a nut member 87 screwed into the lead screw 86, a motor 88, and a rotational force of the motor 88. A transmission member 89 such as a belt and a pulley for simultaneously transmitting to each lead screw 86 of the temporary holder 80 is provided. A pair of left and right temporary holders 80 are provided via the transmission member 89 by rotating the motor 88. However, it is comprised so that it can move to the same height to an up-down direction synchronizing with each other. That is, the temporary support base 80 reciprocates between the raised position shown in FIG. 11 and the lowered position shown in FIG.

  A support portion 90 having a shape (for example, a V shape) capable of supporting the axle tube 3 in a horizontal posture when the temporary support base 80 is in the raised position is formed at the upper end of the temporary support base 80. The housing 1 supported by the support portion 90 can rotate in the front-rear direction (the direction indicated by the arrow Q in FIG. 11) about the axle tube 3.

  As shown in FIG. 10, the guide portion 82 includes a plurality of (for example, six) guide members 95 arranged radially on the bolt temporary placement stage T2. These guide members 95 can be moved in the direction of opening and closing each other by an interlocking mechanism 96 shown in FIG. 11 or the like according to the inner diameter of the opening 4 of the housing 1, and the opening amount W thereof can be adjusted. . On the outer surface of the upper end portion of each guide member 95, a guide slope 95a inclined in a tapered shape is formed.

  An example of the interlocking mechanism 96 includes a screw shaft 97 extending in the horizontal direction, a bevel gear 98 that rotates integrally with the screw shaft 97, a servo motor 99 that rotates the bevel gear 98, and a screw member 97. And a female screw member 100 that is screwed in the axial direction of the screw shaft 97. The rotational motion of the servo motor 99 is equally transmitted to each screw shaft 97 via the bevel gear 98, and the screw shaft 97 rotates, so that each female screw member 100 is the same amount according to the rotation amount and the rotation direction. The guide members 95 are configured to move in the same direction (opening and closing direction) in synchronization with each other.

  The guide member 95 and the interlocking mechanism 96 are provided on an elevating base 111 that can move in the vertical direction with respect to the fixed base 110. The raising / lowering base 111 moves up and down along a guide rail 112 provided on the fixed base 110 along the vertical direction, and a lowered position shown in FIG. 11 and a raised position shown in FIG. 12 by a fluid pressure cylinder mechanism 113 as an example of an actuator. It can be moved up and down (height regulated by the stopper 114).

  The pallet positioning mechanism 83 includes a location pin 121 that is driven up and down by an actuator 120 such as an air cylinder. When the location pin 121 is raised by the actuator 120, the location pin 121 is positioned in the positioning hole 30 of the pallet 15. The pallet 15 can be positioned in the horizontal direction on the bolt temporary placement stage T2.

  The sub-conveyor 14 extends in the horizontal direction from the temporary bolt placement stage T2 to the workpiece delivery stage T3, and advances the pallet 15 and the housing 1 on the sub-conveyor 14 to the workpiece delivery stage T3 (moves in the direction indicated by the arrow F3). It can be made to.

  Next, a bolt temporary placement process using the bolt temporary placement facility 10 of this embodiment will be described with reference to the flowchart shown in FIG.

  [Step: S1] In FIG. 1, the main conveyor 11 carries the pallet 15 and the housing (work) 1 placed thereon from the left side of the drawing to the shuttle position, that is, the work receiving stage T1. The sub ring 15b is not put on the pallet main body 15a at the time of carrying in. The sub-ring 15b is placed on the pallet body 15a as necessary in step S5 described later.

  [Step: S2] As shown in FIG. 2 or 7 and the like, the shuttle arms 61 and 62 are raised to the transport height H. At this time, the shuttle arms 61 and 62 are in the first turning position as shown in FIG.

  [Step: S3] The shuttle travel mechanism 41 operates and the shuttle body 40 traverses in the direction of the arrow F2 along the rack 42 and the traversing guide 45 to the bolt temporary placement stage T2 (outward path). It is carried to just above the work guide mechanism 13. At this time, the guide member 95 is lowered to the lowered position by operating the cylinder mechanism 113 to the contraction side so as not to interfere with the movement path of the pallet 15. The opening amount W (shown in FIG. 11) of each guide member 95 is adjusted by the interlocking mechanism 96 according to the inner diameter of the opening 4 of the housing 1.

  [Step: S4] After the housing 1 and the pallet 15 are moved to a position directly above the work guide mechanism 13, the cylinder mechanism 113 is operated to the extension side, whereby the guide member 95 is raised to the raised position shown in FIG. The temporary cradle 80 is moved to the raised position shown in FIG.

  Then, when the lifting mechanism 53 of the shuttle conveyor 12 is operated, the shuttle arms 61 and 62 are lowered to the lower end L. While the shuttle arms 61 and 62 are being lowered to the lower end L, first, the axle tube 3 of the housing 1 is placed on the support portion 90 of the temporary support 80, and the shuttle arms 61 and 62 are further lowered to the lower end L. Thus, the pallet 15 gets on the sub-conveyor 14.

  [Step: S5] When the axle tube 3 rides on the support portion 90, the housing 1 is moved around the axle tube 3 so that the opening 4 of the housing 1 faces the operator as shown in FIG. Rotate 90 degrees by hand. Then, by inserting a hand into the opening 4 of the housing 1 and passing the bolt 5 from the inside of the housing 1 through the bolt insertion hole 6, the opening 4 of the housing 1 is lowered as shown in FIG. The attitude of the housing 1 is returned to the original position around the axle tube 3 so as to face. Moreover, the operation | work which mounts the sub ring 15b on the pallet main body 15a according to the kind of housing 1 is also performed. Depending on the type of the housing 1, the sub-ring 15b may not be placed.

  [Step: S6] By operating the motor 88 of the temporary support raising / lowering mechanism 85, the temporary support 80 is lowered. As shown in FIG. 12, the inner peripheral edge 4a of the opening 4 of the housing 1 is lowered in contact with the guide slope 95a of the guide member 95 while the temporary support base 80 is being lowered. Even if the housing 1 is slightly inclined about the axle tube 3, the housing 1 approaches the pallet 15 as the inner peripheral edge 4 a of the opening 4 is lowered while contacting the guide slope 95 a of each guide member 95. As the housing 1 becomes horizontal, the housing 1 is centered with respect to the work guide mechanism 13 at the same time.

  At this time, the position of the housing 1 in the circumferential direction is regulated to a predetermined position by the support portions 90 of the pair of left and right temporary receiving bases 80. The bolt receiving hole 22 of 15a or the bolt receiving hole 26 of the sub ring 15b is matched. That is, when the sub ring 15b is put on the pallet main body 15a, each bolt 5 is inserted into the bolt receiving hole 26 of the sub ring 15b. When the sub ring 15b is not placed, each bolt 5 is inserted into the bolt receiving hole 22 of the pallet main body 15a. Thus, the temporary placement operation of the bolt 5 is completed.

  [Step: S7] After the temporary placement of the bolts 5 in step S6, the sub-conveyor 14 moves forward in the direction of arrow F3, whereby the housing 1 moves forward together with the pallet 15 to the workpiece discharge stage T3. Further, the shuttle arms 61 and 62 are inverted 180 ° and face the back side (second turning position) of the shuttle body 40.

[Step: S8] When the elevating mechanism 53 is operated and the shuttle arms 61 and 62 are raised to the conveyance feed height H, the housing 1 is lifted together with the pallet 15.
[Step: S9] When the shuttle travel mechanism 41 is activated and the shuttle body 40 traverses (returns) in the direction of arrow F4, the housing 1 moves together with the pallet 15 onto the workpiece return stage T4 on the main conveyor 11 as shown in FIG. It will be in the state shown in

[Step: S10] When the elevating mechanism 53 operates and the shuttle arms 61 and 62 descend to the intermediate height M below the main conveyor 11, the housing 1 rides on the main conveyor 11 together with the pallet 15.
[Step: S11] As the main conveyor 11 moves forward in the direction of arrow F1, the housing 1 is sent to the next step together with the pallet 15. The shuttle arms 61 and 62 are reversed 180 ° to the original direction (first turning position). ) To return to the state of FIG.

  By passing through the above-described series of steps S1 to S11, the bolt temporary placement work for one housing is completed. Then, the new housing 1 is sent from the main conveyor 11 to the bolt temporary placement stage T2 by the shuttle conveyor 12, and the bolt temporary placement steps S1 to S11 described above are repeated.

The top view of the equipment for temporary bolt placement which has the shuttle conveyor of one Embodiment of this invention. FIG. 2 is a side view of the temporary bolt installation facility shown in FIG. 1. FIG. 2 is a front view of the temporary bolt placement facility shown in FIG. 1. FIG. 2 is a plan view of a pallet of the bolt temporary placement facility shown in FIG. 1. The top view of the state which put the workpiece | work on the pallet shown by FIG. The front view of the shuttle conveyor shown by FIG. The side view of the shuttle conveyor shown by FIG. The top view of the shuttle conveyor shown by FIG. The top view of the state which the shuttle arm of the shuttle conveyor shown by FIG. 8 reversed. FIG. 2 is a plan view of a temporary bolt storage stage of the temporary bolt storage facility shown in FIG. 1. Sectional drawing in alignment with the XI-XI line in FIG. Sectional drawing of the state which the guide member of the volt | bolt temporary placement stage shown by FIG. 11 fell. FIG. 12 is a side view showing a cross section of a part of a temporary support base and a workpiece of the temporary bolt placement stage shown in FIG. 11. The flowchart which shows the volt | bolt temporary placement operation | work using the volt | bolt temporary placement equipment shown by FIG. 1 in process order. The perspective view which shows the housing for differential machines. FIG. 16 is a cross-sectional view showing a part of the housing and pallet shown in FIG. 15.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Housing 4 ... Opening part 5 ... Bolt 10 ... Bolt temporary installation equipment 11 ... Main conveyor 12 ... Shuttle conveyor 13 ... Work guide mechanism 14 ... Sub-conveyor 15 ... Pallet 22,26 ... Bolt receiving hole 40 ... Shuttle main body 41 ... Shuttle travel mechanism 53 ... Lifting mechanism 61, 62 ... Shuttle arm 65 ... Turning mechanism 80 ... Temporary cradle 85 ... Temporary cradle lifting mechanism 90 ... Supporting part 95 ... Guide member

Claims (2)

A workpiece receiving stage and a workpiece returning stage for delivering a pallet provided with a differential housing as a workpiece on the main conveyor;
A bolt temporary placement facility having a bolt temporary placement stage that is provided on the sub-conveyor side apart from the main conveyor and for inserting a bolt into a bolt insertion hole at a peripheral edge of the opening of the workpiece,
The work receiving stage and the workpiece back stage and the between the bolt temporary stage reciprocates and for a liftable shuttle arm up and down the chromatic vital the shuttle arm while holding the pallet the workpiece is placed A shuttle conveyor having a lifting mechanism ;
The bolt temporary placement stage is provided so as to be movable up and down, and has a support part that receives the axle tube of the workpiece when the pallet and the workpiece held by the shuttle arm are lowered together with the shuttle arm, A temporary cradle in which the bolt is inserted into each bolt insertion hole of the workpiece in a state of being supported by the support portion;
A temporary cradle lifting mechanism for lifting and lowering the temporary cradle;
The workpiece, which is provided in the bolt temporary placement stage so as to be movable in the vertical direction and the bolt is inserted into the bolt insertion hole, is lowered by the temporary receiving table lifting mechanism, and the workpiece is moved to the sub-conveyor. A guide member that enters the opening of the work in the middle of riding on it and centers the work;
And a mechanism to keep the guide member in the state can be lowered to be not lowered position interfering with the movement path and in which the guide member is raised the guide member when it enters the opening of the work of the pallet Equipped,
While the shuttle arm is being lowered by the lifting mechanism of the shuttle conveyor, the axle tube rides on the support portion of the temporary receiving stand, and the shuttle arm is further lowered so that the pallet is placed on the sub-conveyor. Ride
Each bolt is inserted into the bolt receiving hole of the pallet when the temporary receiving table is lowered by the temporary receiving table elevating mechanism in a state where the axle tube is supported by the support portion of the temporary receiving table. Bolt temporary storage facility using a shuttle conveyor. In the bolt temporary installation facility according to claim 1,
The shuttle conveyor is
A shuttle body capable of reciprocating between the workpiece receiving stage and the workpiece return stage and the bolt temporary placement stage;
A shuttle travel mechanism for reciprocating the shuttle body;
An elevating mechanism for elevating the shuttle body;
The shuttle body is provided in the shuttle body so as to be able to reverse in a substantially horizontal direction from the first turning position to the second turning position, and supports the pallet at the first turning position when the shuttle body moves forward, and the shuttle body A shuttle arm that reverses to the second swivel position and supports the pallet when the main body moves backward,
A turning mechanism for turning the shuttle arm between the first turning position and the second turning position;
The equipment for temporary storage of bolts according to claim 1, comprising:

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