JP2011168245A - Conveying truck, conveying line and conveying method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conveying truck, a conveying line and a conveying method, for extremely simplifying a structure of a conveying truck itself and the conveying line of using the conveying truck, by moving a plurality of installation work processes while placing a base part on a plurality of posts by performing positioning. <P>SOLUTION: This conveying truck 3 includes a base truck part 4 formed by erecting the plurality of posts 44 for placing the base part 8 and a work truck part 5 liftably supported to the plurality of posts 44 and forming a scaffold of a worker. The conveying truck 3 is formed by switching a first moving state 301 of integrally moving both truck parts 4 and 5 by rollingly contacting the base truck part 4 between an underfloor pit 21 and itself and rollingly contacting the work truck part 5 between the floor surface just under side 22 and itself and a second moving state 302 of integrally moving both truck parts 4 and 5 by rollingly contacting the base truck part 4 between the floor surface just under side 22 and itself in a state of placing the work truck part 5 on the upper side. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a transport carriage, a transport line, and a transport method for transporting workpieces on a factory assembly line.

For example, in an automobile assembly line, a main body serving as a base part is placed on a transport carriage, and various assembly parts are attached to the main body while moving the transport carriage. For example, in the assembly transportation device such as an automobile disclosed in Patent Document 1, it is synchronized with the transport carriage from the start position to the end position of the specific section below the specific section where the parts are assembled in the travel route of the transport carriage. A movable traveling carriage is provided, and a transfer device is mounted on the synchronous traveling vehicle, and an assembly part such as an engine is mounted to the vehicle body on the transport carriage by the transfer device to a height at which it can be easily assembled. Lifting is disclosed.
Further, for example, in the vehicle body position correction transport system disclosed in Patent Document 2, when the vehicle body placed on the transport carriage is transported to a plurality of processes, a lift mechanism is mounted on the transport carriage, and the lift mechanism allows The height of the car body can be changed.

JP 2009-248657 A JP-A-9-309473

  However, in the main body (vehicle body) of an automobile and the like, the assembly height for assembling various assembly parts is different, so it is necessary to change the conveyance height of the main body with respect to the floor of the factory in each assembly process. Arise. For example, in the trim process for assembling interior parts, the main body is transported near the floor surface, while in the chassis process for assembling undercarriage parts, fuel tanks, etc., it is necessary to lift and transport the main body to a high position. .

For this reason, the transport cart disclosed in Patent Document 1 uses a transport cart that is different between processes, and in particular, in the chassis process, a lift transport device that suspends and transports the main body is used. As a result, the main body is transferred between the transfer carriages, or transferred between the transfer carriage and the lift transfer apparatus, and the structure of the entire transfer line becomes complicated.
In addition, in the transport cart disclosed in Patent Document 2, the lift mechanism is mounted on the transport cart, so that the structure of the transport cart itself is complicated.

  The present invention has been made in view of such a conventional problem, and can move a plurality of assembling work steps while positioning and mounting a base component with respect to a plurality of posts. It is another object of the present invention to provide a conveyance carriage, a conveyance line, and a conveyance method that can greatly simplify the structure of a conveyance line that uses the conveyance carriage.

According to a first aspect of the present invention, there is provided a base carriage unit in which a plurality of posts for positioning and mounting a base part are erected, and a base carriage unit that supports the plurality of posts so as to be movable up and down. A work carriage unit that forms a scaffold for the worker on the upper side,
A first moving state in which the base carriage part is in rolling contact with an underfloor pit and the working carriage part is in rolling contact with the floor surface or immediately below the floor surface to move both carriage parts integrally; and In a state where the work carriage part is placed on the upper side, the base carriage part rolls between the floor surface or directly below the floor surface to form either one of the second movement states in which both carriage parts are moved integrally. ,
The base component is positioned and placed on the plurality of posts, and is configured to be switched between the first movement state and the second movement state to be moved. It exists in a conveyance trolley | bogie (Claim 1).

A second invention is a transport line for an automobile production line that uses the transport carriage to assemble various assembly parts to the main body of the automobile as the base part,
The transfer line includes a pit line that moves the transfer carriage by forming the first movement state, and a floor line that moves the transfer carriage by forming the second movement state,
Maintaining the state where the main body is positioned and placed on the plurality of posts by lifting the transfer carriage by a transfer device and moving between the pit line and the floor surface line, In the conveyance line, the conveyance carriage is configured to continuously move between the pit line, the floor surface line, and the pit line (claim 6).

3rd invention is the conveyance method for motor vehicle production lines which assembles various assembly parts to the main body of the car as the base part using the above-mentioned conveyance cart,
Forming a pit line for moving the transport carriage by forming the first movement state and a floor line for moving the transport carriage by forming the second movement state;
Maintaining the state where the main body is positioned and placed on the plurality of posts by lifting the transfer carriage by a transfer device and moving between the pit line and the floor surface line, According to another aspect of the present invention, there is provided a transport method in which the transport carriage is continuously moved between the pit line, the floor line, and the space between them.

The conveyance cart of the first invention maintains the state where the base part is positioned and placed, and continuously moves to a plurality of assembly work steps with different work height ranges of the worker relative to the base part. It is something that can be done.
Specifically, the transporting carriage of the present invention includes a base carriage section in which a plurality of posts are erected and a work carriage section that is supported so as to be movable up and down with respect to the plurality of posts. Then, in the process in which the worker works from above and from the side of the base part, the transport carriage forms the first movement state, and the base carriage part is brought into rolling contact with the underfloor pit and the work carriage part is placed on the floor. Rolling contact is made between the surface or just below the floor, and the two trolley parts are moved together. As a result, the work platform appropriately secures the worker's scaffolding without causing obstacles on the worker's scaffolding other than multiple posts and without forming a large step between the floor of the factory. can do. Then, the worker can perform work such as assembling the assembly parts from above or from the side of the base part using the work carriage unit as a scaffold.

Here, the underfloor pit can be formed by digging down from the floor of the factory. There are decks (high ground) on both sides of the place where the transport carriage moves on the floor of the factory. It can also be formed lower.
Moreover, the state which makes a base trolley part roll-contact between underfloor pits can be formed by providing a roller in either a base trolley part or an underfloor pit. Similarly, the state in which the work carriage unit is brought into rolling contact with the floor surface or just below the floor surface can be formed by providing rollers on either the work carriage portion and the floor surface or just below the floor surface. .

  On the other hand, in the process in which the operator works from below the base part, the transport carriage forms the second movement state, and the base carriage part is placed on the floor surface or directly below the floor surface with the work carriage part placed on the upper side. The two trolley parts are moved together in rolling contact with each other. As a result, the work platform appropriately secures the worker's scaffolding without causing obstacles on the worker's scaffolding other than multiple posts and without forming a large step between the floor of the factory. can do. Then, the worker can perform an operation such as assembling the assembly component from below the base component using the work carriage unit as a scaffold.

Here, the floor directly under the floor can be formed by digging slightly from the floor of the factory, and both sides of the factory floor where the transport carriage moves are provided with lower decks. It can also be formed lower than the other deck.
Moreover, the state which makes a base trolley part roll-contact between a floor surface or just under a floor surface can provide and form a roller in either a base trolley part and a floor surface or just under a floor surface.

  Thus, the transport cart of the present invention changes the relative height relationship between the base cart portion and the work cart portion, thereby maintaining the state in which the base parts are positioned and placed on the plurality of posts while maintaining the state. It is possible to move to a plurality of assembly work steps having different assembling work height ranges. This eliminates the need for transfer of base parts between a plurality of transport carts, transfer of base parts between a transport cart and a lift transport device, etc. Transport management can be simplified.

In addition, since the work carriage unit is provided on the transport carriage itself to form the worker's scaffolding, the worker's scaffolding can be appropriately secured in any assembly work process in which the transport carriage is moved. .
Further, the transport cart is not provided with a mechanism for raising and lowering the work cart section. Thereby, the structure of a conveyance trolley can be simplified very much. Moreover, the same conveyance trolley | bogie can be used in a some assembly work process, and the structure of the whole conveyance line which moves a conveyance trolley | bogie can be made very simple.

  Therefore, according to the transport carriage of the first invention, it is possible to move a plurality of assembly work steps while positioning and placing the base parts with respect to the plurality of posts, and the transport carriage itself and the transport carriage. The structure of the transfer line using the can be greatly simplified.

The conveyance line of the second invention is the assembly of various assembly parts to the base part by forming the first movement state or the second movement state with respect to the pit line and the floor surface line and moving the conveyance carriage. Etc. are performed. And in the conveyance line of this invention, a conveyance trolley can be lifted with a transfer apparatus, and can be moved between a pit line and a floor surface line. As a result, the state where the main body is positioned and placed on the plurality of posts can be maintained, and the transport carriage can be continuously moved between the pit line, the floor surface line, and between them.
Therefore, according to the transport line of the second invention, the transport carriage is continuously moved between the plurality of assembly work steps while the base parts are positioned and placed with respect to the plurality of posts. Therefore, the structure of the transfer carriage itself and the transfer line using the transfer carriage can be extremely simplified.

In the transport method of the third invention, as in the second invention, the main body is positioned and placed on a plurality of posts and maintained, and the transport cart is moved to the pit line, the floor line, and these It can be moved continuously between.
Therefore, according to the transport method of the third invention, the transport carriage is continuously moved between the plurality of assembly work steps while the base parts are positioned and placed with respect to the plurality of posts. Therefore, the structure of the transfer carriage itself and the transfer line using the transfer carriage can be extremely simplified.

Explanatory drawing which shows the conveyance trolley which formed the 1st movement state and the 2nd movement state in the Example seen from the left-right direction. Explanatory drawing which shows the conveyance trolley which formed the 1st movement state in the Example seen from the left-right direction. Explanatory drawing which shows the conveyance trolley which formed the 1st movement state in the Example seen from the front-back direction. Explanatory drawing which shows the conveyance trolley in which the 2nd movement state in the Example was seen from the left-right direction. Explanatory drawing which shows the conveyance trolley which formed the 2nd movement state in the Example in the state seen from the front-back direction. Explanatory drawing which shows the work trolley | bogie part in a conveyance trolley in an Example seen from the upper direction. Explanatory drawing which shows the base trolley | bogie part in a conveyance trolley in the Example seen from the downward direction. Explanatory drawing which shows a part of conveyance trolley which formed the 1st movement state in the Example seen from the front-back direction. Explanatory drawing which shows a part of conveyance trolley which formed the 1st movement state in the Example in the state seen from the left-right direction. Explanatory drawing which shows a part of conveyance trolley which formed the 2nd movement state in the Example seen from the front-back direction. Explanatory drawing which shows a part of conveyance trolley in which the 2nd movement state in the Example was seen from the left-right direction. Explanatory drawing which shows the arrangement | positioning relationship when the conveyance line for motor vehicle production lines is comprised with the conveyance trolley | bogie in an Example. Explanatory drawing which shows the conveyance trolley which formed the other 2nd movement state in the Example in the state seen from the front-back direction.

A preferred embodiment of the first to third inventions described above will be described.
In the first to third aspects of the invention, the work floor surface of the work carriage unit is the floor surface of the factory or the floor when forming any of the first movement state and the second movement state. It is preferable that the carriage is moved so as to be substantially flush with the upper surface of the deck provided on the surface.
In this case, no step is formed between the work floor surface of the work carriage unit and the floor surface or deck of the factory, and the worker can walk smoothly between them. Therefore, workability by the worker can be improved.

Further, the base part is a main body of an automobile, and the plurality of posts are erected upward from the base carriage part so as to position and place the main body. Among the two posts, the front two posts and the two rear posts are a plurality of types of the above-mentioned base carriage that slide in the front-rear direction and have different lengths in the front-rear direction. It is preferable that the main body is positioned and placed (Claim 3).
In this case, of the four posts, any one of the two posts on the front side and the two posts on the rear side slides in the front-rear direction with respect to the base carriage part, thereby moving in the front-rear direction. It is possible to stably maintain a state in which a plurality of types of main bodies having different lengths are positioned with respect to the four posts.

In addition, the working carriage part can be moved up and down by rolling contact with the plurality of posts, and the state where the base carriage part is in rolling contact with the underfloor pit is the base carriage part or the underfloor pit. A plurality of rollers are provided on any of the above, and the state where the working carriage part is in rolling contact with the floor surface or just below the floor surface is the work carriage part and the floor surface or just below the floor surface. A state in which the base carriage part is in rolling contact with the floor surface or immediately below the floor surface is formed by providing the base carriage part and the floor surface or directly below the floor surface. It is preferable to form a plurality of rollers on any of the above (claim 4).
In this case, the work carriage part can be easily raised and lowered with respect to the base carriage part, and the base carriage part and the work carriage part can be stably brought into rolling contact with the plurality of rollers. The roller can be composed of rolling members such as wheels, rollers, and balls.

Further, it is preferable that the transporting carriage is configured to be moved in a row by being driven by a drive roller that rotates and contacts the left and right sides of the base carriage part and sandwiches and sends out the base carriage part. ).
In this case, a plurality of transport carts can be moved simultaneously and continuously in the transport line by a simple method.

Hereinafter, embodiments of the transport carriage, the transport line, and the transport method of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the transport carriage 3 of the present example has a plurality of posts 44 for positioning and mounting the base component 8, and a plurality of posts 44. A work carriage unit 5 that is supported so as to be movable up and down and that forms a scaffold for the worker is provided above the base carriage unit 4.
As shown in FIGS. 2 and 3, the transport carriage 3 is in contact with the base carriage unit 4 in rolling contact with the underfloor pit 21, and the work carriage unit 5 is in contact with rolling contact with the floor 2 or directly below the floor 22. As shown in FIGS. 4 and 5, the base carriage unit 4 is placed on the floor surface 2 with the work carriage unit 5 placed on the upper side as shown in FIGS. One of the second moving states 302 is formed in which the two cart units 4 and 5 are moved together by rolling contact with the floor 22 immediately below. The transport carriage 3 is formed by switching between the first movement state 301 and the second movement state 302 while maintaining the state in which the base component 8 is positioned and placed on the plurality of posts 44. , 302 is also configured such that the base carriage unit 4 and the work carriage unit 5 are accommodated in the floor surface 2 and moved.

Below, it demonstrates in detail with reference to FIGS. 1-13 about the conveyance trolley 3, the conveyance line 1, and the conveyance method of this example.
The base part 8 of this example is a main body 8 of an automobile, and the transport carriage 3 of this example is used for an automobile production line. The main body 8 transported by the transport carriage 3 includes various vehicle types having different lengths in the front-rear direction.
As shown in FIGS. 6, 9, and 11, four posts 44 are erected from the base cart portion 4 of this example, two in the front, rear, left, and right side and upward. Of the four posts 44, the two front posts 44 </ b> A are fixed to the base carriage unit 4, and the two rear posts 44 </ b> B of the four posts 44 are connected to the base carriage unit 4. It is configured to slide in the front-rear direction L. The two rear posts 44B can be slid in the front-rear direction L by slide mechanisms 42 arranged on the left and right, respectively. The slide mechanism 42 of this example is configured by using two linear guides arranged in the front-rear direction L. The linear guide is a rail attached to the base carriage unit 4 and a slider that is in rolling contact with the rail. It consists of.

As shown in FIGS. 8 to 11, the work carriage unit 5 can move up and down by rolling contact with the four posts 44. Each post 44 is in contact with a roller 53 disposed on the work carriage unit 5, and the work carriage unit 5 can be moved up and down by the roller 53.
The work carriage unit 5 is formed with a through hole 52 through which the four posts 44 are inserted. The through hole 52 through which the rear two posts 44B that slide in the front-rear direction L are inserted is formed long in the front-rear direction L (see FIG. 6).

Positioning pins 45 for positioning the main body 8 and weight receivers 46 for receiving the lower portions of the main body 8 are provided at the upper ends of the two front posts 44, respectively. A positioning hole for inserting the positioning pin 45 is formed in the lower part of the main body 8 of all vehicle types. A weight receiver 46 for receiving the lower portion of the main body 8 is provided at the upper end of the two rear posts 44B.
The rear two posts 44 </ b> B change the slide position in the front-rear direction L by the slide mechanism 42 according to the vehicle type of the main body 8 to be placed, and the slide position is fixed by the lock mechanism 43.

  As shown in FIGS. 6 and 7, the main body 8 of this example is placed on the four posts 44 of the transport carriage 3 with its front-rear direction aligned with the front-rear direction L of the transport carriage 3. The transport carriage 3 is movable in the front-rear direction L and the left-right direction W. The transport carriage 3 includes a first traveling direction D1 parallel to the front-rear direction of the main body 8 placed on the four posts 44 and a second parallel to the left-right direction of the main body 8 placed on the four posts 44. It is possible to move by switching to the traveling direction D2.

  As shown in FIGS. 2 and 3, the first movement state 301 of the transport carriage 3 in this example is such that a plurality of rollers 41 provided on the base carriage unit 4 roll on and contact the rail 211 provided on the underfloor pit 21. A plurality of rollers 51 provided in the carriage unit 5 are formed in a state of rolling on the rails 221 provided immediately below the floor surface 22. Further, as shown in FIGS. 4 and 5, the second movement state 302 of the transport carriage 3 is such that the plurality of rollers 41 provided on the base carriage unit 4 with the work carriage unit 5 placed on the upper side are 22 directly below the floor surface. It is formed in a state of rolling contact on the rail 221 provided on the surface.

  As shown in FIGS. 8 to 11, a plurality of rollers 41, 51 for rolling the cart units 4, 5 to the rails 211, 221 project on the lower surfaces of the base cart unit 4 and the work cart unit 5. . The base carriage unit 4 has a plurality of rollers 41A arranged in the front-rear direction L on the left and right of the lower surface, and a plurality of rollers 41B arranged in the left-right direction W on the front, rear, and intermediate portions of the lower surface. is there. A plurality of rollers 51 are arranged in the work cart unit 5 in the front-rear direction L on the left and right sides of the lower surface thereof.

The conveyance cart 3 of this example is applied to an automobile production line in which various assembling parts are assembled to the main body 8 to constitute the conveyance line 1.
As shown in FIG. 12, this automobile production line includes a trim process 101 for assembling various interior parts to the main body 8, and various undercarriage parts, engines, fuel tanks, tires for the main body 8. And a final process 103 for assembling various electrical components, injecting oil and gas into the main body 8, and the like. The transport carriage 3 holds the main body 8 and travels through all the steps. After the assembled vehicle, which is the main body 8 that has been assembled, is sent out, the transport cart 3 circulates again to the first trim step 101 and moves. It is configured to

  In each of the trim process 101, chassis process 102, and final process 103, the transport carriage 3 is driven by a drive roller 23 disposed on the upstream side of the line in each process, and a plurality of cars are connected on the rails 211 and 221. Is configured to move. The drive roller 23 is configured to rotationally contact the left and right sides of the base carriage unit 4 in the transport carriage 3 located on the most upstream side of each process line, and sandwich the base carriage unit 4 and send it out.

As shown in FIGS. 2 and 3, the transport line 1 includes a pit line 11 for moving the transport carriage 3 by forming a first movement state 301, and a second movement state 302 as shown in FIGS. 4 and 5. There is a floor line 12 that is formed and moves the carriage 3.
As shown in FIG. 12, the trim process 101 and the final process 103 are formed by the pit lines 11, and the chassis process 102 is formed by the floor line 12. The transport carriage 3 moves the pit line 11 in the first traveling direction D1 in the trimming process 101 and the final process 103, and moves the floor line 12 in the second traveling direction D2 in the chassis process 102.

2, 3, 8, and 9 show the case where the transport carriage 3 moves the pit line 11 in the first traveling direction D <b> 1, and in FIGS. 4, 5, 10, and 11, A case where the transport carriage 3 moves on the floor surface line 12 in the first traveling direction D1 is shown. On the other hand, in the chassis process 102 of the present example, the transport carriage 3 moves the floor surface line 12 in the second traveling direction D2.
The transport carriage 3 can move in either the first traveling direction D1 or the second traveling direction D2 in any of the pit line 11 and the floor surface line 12.

Further, the transport carriage 3 is driven by the drive roller 23 in any of the steps 101, 102, and 103, and moves continuously in the traveling directions D1 and D2. The conveyance line 1 of this example maintains the state where the main body 8 is positioned and placed on the four posts 44, and the conveyance carriage 3 is moved between the pit line 11, the floor surface line 12, and between these. It is configured to move continuously.
As shown in FIGS. 2 to 5, the transport carriage 3 is configured so that the work floor of the work carriage unit 5 can be used in any of the movement states 301 and 302 of the first movement state 301 and the second movement state 302. The surface 50 is moved so that it is substantially flush with the factory floor 2.

As shown in FIG. 12, the transport carriage 3 is lifted and transported by the transfer devices 61, 62, 64 when moving between the steps 101, 102, 103. The transfer devices 61, 62, and 64 lift the base carriage unit 4 and the work carriage unit 5 of the transport carriage 3, respectively, and the first movement state 301 in which the relative height relationship between the base carriage unit 4 and the work carriage unit 5 is different. Or the 2nd movement state 302 is formed and it is comprised so that the conveyance trolley | bogie 3 may be mounted in the pit line 11 or the floor surface line 12. FIG.
The conveyance line 1 of this example is configured to reciprocate the conveyance carriage 3 in each of the trim process 101, the chassis process 102, and the final process 103.

  The main body 8 before assembling various assembling parts is positioned and placed on the transport carriage 3 carried into the trimming process 101. The transport carriage 3 is lifted by a carry-in lifting device 61 that is one of transfer devices, and is placed on one pit line 11 </ b> A forming the trim process 101. The transport carriage 3 positions and places the main body 8 and moves to one side of one pit line 11A of the trim process 101 in the first traveling direction D1. Next, the transport carriage 3 that has moved to one side of one pit line 11A in the trim step 101 is transported by the traverse device 63, and then in the first traveling direction D1 to the other side of the other pit line 11B in the trim step 101. Moving. The traverse device 63 receives the transport carriage 3 that moves one pit line 11A in the first traveling direction D1, moves the transport carriage 3 in the second traveling direction D2, and then sends it to the other pit line 11B. It is configured as follows.

  Next, when the transport carriage 3 moves in the first traveling direction D1 to the other side of the other pit line 11B in the trim step 101, the transport cart 3 moves in the second traveling direction D2 by the traverse device 63, and then the direction as a transfer device. It is lifted by the conversion device 64 and is turned by 90 ° and placed on one floor line 12C of the chassis process 102. Next, the transport cart 3 maintains the state in which the main body 8 is held, and moves in the second traveling direction D <b> 2 to one side of one floor line 12 </ b> C of the chassis process 102. Next, the transport carriage 3 that has moved to one side of one floor surface line 12C of the chassis step 102 is transported in the first traveling direction D1 by the traverse device 63, and then the other floor surface line 12D of the chassis step 102. Move to the second traveling direction D2. The traverse device 63 receives the transport cart 3 that moves the one floor surface line 12C in the second traveling direction D2, moves the transport cart 3 in the first traveling direction D1, and then moves the other floor surface line 12D. It is configured to send out.

  Next, when the transport carriage 3 moves in the second traveling direction D2 to the other side of the other floor surface line 12D of the chassis step 102, the transport cart 3 moves in the first traveling direction D1 by the traverse device 63, and then serves as a transfer device. It is lifted by the direction changing device 64 and turned 90 °, and placed on one pit line 11E of the final process 103. The transport carriage 3 positions and places the main body 8 and moves to the one side of one pit line 11E in the final process 103 in the first traveling direction D1. Next, the transport carriage 3 moved to one side of one pit line 11E in the final process 103 is transported by the traverse device 63, and then in the first traveling direction D1 to the other side of the other pit line 11F in the final process 103. Moving. The traverse device 63 receives the transport cart 3 that moves one pit line 11E in the first traveling direction D1, moves the transport cart 3 in the second traveling direction D2, and then sends the transport cart 3 to the other pit line 11F. It is configured as follows.

Next, when the transport carriage 3 moves in the first advancing direction D1 to the other side of the other pit line 11F in the final process 103, the main body 8 in which the assembly of various assembly parts has been completed is taken out from the transport carriage 3. . Further, the transport carriage 3 is lifted by a carry-out lifting device 62 that is one of the transfer devices, and is placed on the circulation line 65. Then, the empty transport carriage 3 that does not hold the main body 8 in the circulation line 65 is moved in the second traveling direction D2, and the main body 8 before the assembly of various assembly parts is held again on the transport carriage 3, It is carried into the trim process 101.
Thereafter, the plurality of transport carts 3 can circulate the trim process 101, the chassis process 102, and the final process 103 many times.

The transport cart 3 of this example maintains the state where the main body 8 is positioned and placed, and continuously moves to a plurality of assembling work steps with different work height ranges of the worker relative to the main body 8. It is something that can be done.
In the trim process 101 and the final process 103 in which an operator works from above and from the side of the main body 8, the transport carriage 3 forms a first movement state 301 as shown in FIGS. A plurality of rollers 41 in the cart unit 4 are brought into contact with rolling on the rail 211 of the underfloor pit 21 dug down from the floor 2 of the factory, and a plurality of rollers 51 in the work cart unit 5 are provided on the rail 22 directly below the floor surface. The two cart units 4 and 5 are moved together in a rolling manner on 221.

  At this time, both the base carriage unit 4 and the work carriage unit 5 can be accommodated in the floor 2 and moved. In addition, the transport cart 3 of this example is configured such that the work floor surface 50 of the work cart section 5 is substantially flush with the floor surface 2 and most of the plurality of posts 44 are accommodated in the floor surface 2 and moved. Can do. Thereby, there is almost no obstacle on the worker's scaffolding, and the worker's scaffolding can be appropriately ensured by the work carriage unit 5 without forming a level difference with the floor surface 2. Then, the worker can perform work such as assembling of assembly parts from above and from the side of the main body 8 using the work carriage unit 5 as a scaffold.

On the other hand, in the process in which the worker works from below the main body 8, the transport carriage 3 forms the second movement state 302 as shown in FIGS. 4 and 5, and the work carriage section 5 is placed on the upper side. In this state, the plurality of rollers 41 in the base carriage unit 4 are brought into rolling contact with the rails 221 provided immediately below the floor surface 22 to move the two carriage units 4 and 5 integrally.
At this time, both the base carriage unit 4 and the work carriage unit 5 can be accommodated in the floor 2 and moved. In addition, the transport cart 3 of this example is configured such that the work floor surface 50 of the work cart section 5 is substantially flush with the floor surface 2 and most of the plurality of posts 44 are accommodated in the floor surface 2 and moved. Can do. Thereby, there is almost no obstacle on the worker's scaffolding, and the worker's scaffolding can be appropriately secured by the work carriage unit 5 without forming a level difference with the floor surface 2. Then, the worker can perform work such as assembling of assembly parts from below the main body 8 using the work cart unit 5 as a scaffold.

  In this way, the transport cart 3 of this example changes the relative height relationship between the base cart unit 4 and the work cart unit 5, thereby positioning the main body 8 on the plurality of posts 44. It is possible to move to a plurality of assembling work steps having different assembling work height ranges of the worker while maintaining. Therefore, the transfer of the main body 8 between the plurality of transfer carts 3, the transfer of the main body 8 between the transfer cart 3 and the lift transfer device, etc. can be made unnecessary. The conveyance management of the main body 8 in the process can be simplified.

In addition, since the work carriage unit 5 is provided on the transport carriage 3 itself to form a scaffold for the worker, the scaffold for the worker is appropriately secured in any assembly work process in which the transport carriage 3 is moved. be able to. Further, in the transport cart 3 of this example, the slide mechanism 42 is not provided at the upper end portions of the two rear posts 44B, but is provided at the lower end portions of the two rear posts 44B. Thereby, the slide mechanism 42 does not exist on the upper side of the work cart unit 5, and the workability can be improved so that no obstacle exists at the operator's feet.
Further, the transport carriage 3 is not provided with a mechanism for raising and lowering the work carriage section 5. Thereby, the structure of the conveyance trolley 3 can be made very simple. Moreover, the same conveyance trolley 3 can be used in a some assembly | attachment operation process, and the whole structure of the conveyance line 1 which moves the conveyance trolley 3 can be simplified very much.

  Therefore, according to the transport carriage 3, the transport line 1, and the transport method of the present example, the transport cart 3 is mounted on the plurality of posts 44 while the main body 8 is positioned and placed. Between them, and the structure of the conveyance carriage 3 itself and the conveyance line 1 using the conveyance carriage 3 can be extremely simplified.

As shown in FIG. 13, in the second movement state 302 of the transport carriage 3, the base carriage section 4 on which the work carriage section 5 is placed on the upper side is in rolling contact with the plurality of rollers 41 on the rail 221 provided on the floor surface 2. It can also be configured to move. In this case, the work floor 50 of the work cart unit 5 can be moved so as to be substantially flush with the upper surface 241 of the deck 24 provided on the factory floor 2.
Although illustration is omitted, when the first movement state 301 of the transport carriage 3 is formed, the work carriage section 5 moves while being in rolling contact with the plurality of rollers 51 on the rail 221 provided on the floor surface 2. It can also be configured. In this case, the work floor surface 50 of the work cart section 5 can be moved so as to be substantially flush with the upper surface of the deck provided on the floor 2 of the factory.

  Further, instead of providing the plurality of rollers 41 on the base carriage unit 4, a plurality of rollers such as a conveyor can be provided on the underfloor pit 21, the floor surface 2, or directly below the floor surface 22 where the base carriage unit 4 is in rolling contact. Further, instead of providing the plurality of rollers 51 in the work carriage unit 5, a plurality of rollers such as a conveyor can be provided on the floor surface 2 or 22 directly below the floor surface where the work carriage unit 5 is in rolling contact.

In addition to providing the rail 211 in the underfloor pit 21, a sensor such as an electromagnetic sensor is provided in the base cart portion 4, and the base cart portion 4 is provided in the underfloor pit 21 and the floor surface 2 or directly below the floor surface 22. It is also possible to provide a sensor detection line that is detected by a sensor and move the transport carriage 3 while detecting the transport path by the sensor.
Similarly to this, in addition to providing the rail 221 directly below the floor 22, a sensor such as an electromagnetic sensor is provided on the work carriage 5, and a sensor detection line is provided on the floor 2 or directly below the floor 22. The transport carriage 3 can also be moved while detecting the transport path.

DESCRIPTION OF SYMBOLS 1 Conveyance line 101 Trim process 102 Chassis process 103 Final process 11 Pit line 12 Floor surface 2 Floor surface 21 Under floor pit 211 Rail 22 Directly under floor 221 Rail 23 Drive roller 3 Conveying cart 301 1st movement state 302 2nd movement state 4 Base truck 41 Roller 44 Post 5 Work truck 50 Work floor 51 Roller 8 Base parts (main body)
L Front-rear direction W Left-right direction

Claims (7)

A base carriage unit that is provided with a plurality of posts for positioning and mounting the base parts, and is supported to be movable up and down with respect to the plurality of posts and above the base carriage unit by an operator And a working carriage part that forms a scaffold,
A first moving state in which the base carriage part is in rolling contact with an underfloor pit and the working carriage part is in rolling contact with the floor surface or immediately below the floor surface to move both carriage parts integrally; and In a state where the work carriage part is placed on the upper side, the base carriage part rolls between the floor surface or directly below the floor surface to form either one of the second movement states in which both carriage parts are moved integrally. ,
The base component is positioned and placed on the plurality of posts, and is configured to be switched between the first movement state and the second movement state to be moved. Transport cart.   2. The transport cart according to claim 1, wherein the work floor surface of the work cart unit is the floor surface of the factory or the floor when the first movement state and the second movement state are formed. A transport carriage characterized in that the carriage is configured to be moved in substantially the same plane as the upper surface of the deck provided on the plane. In the conveyance cart according to claim 1 or 2, the base part is a main body of an automobile,
The plurality of posts are erected upward from the base carriage unit so as to position and place the main body,
Of the four posts, the two front posts and the two rear posts have different lengths in the front-rear direction because any two of them slide in the front-rear direction with respect to the base carriage part. A transport cart characterized in that a plurality of types of main bodies are positioned and placed. In the conveyance trolley as described in any one of Claims 1-3, the above-mentioned work trolley part can be raised and lowered by rolling contact with respect to the above-mentioned plurality of posts,
The state in which the base carriage part is in rolling contact with the underfloor pit is formed by providing a plurality of rollers on either the base carriage part or the underfloor pit,
The state in which the work carriage part is in rolling contact with the floor surface or just below the floor surface is formed by providing a plurality of rollers on either the work carriage part and the floor surface or just below the floor surface,
The state in which the base carriage portion is in rolling contact with the floor surface or directly below the floor surface is formed by providing a plurality of rollers on either the base carriage portion and the floor surface or directly below the floor surface. A transport cart characterized by   5. The transport cart according to claim 1, wherein the transport cart is driven by a drive roller that rotates and contacts the left and right sides of the base cart portion and sandwiches and feeds the base cart portion. A transport cart characterized by being configured to move in a row. A transport line for an automobile production line that uses the transport carriage according to any one of claims 1 to 5 to assemble various assembly parts to the main body of the automobile as the base part. ,
The transfer line includes a pit line that moves the transfer carriage by forming the first movement state, and a floor line that moves the transfer carriage by forming the second movement state,
Maintaining the state where the main body is positioned and placed on the plurality of posts by lifting the transfer carriage by a transfer device and moving between the pit line and the floor surface line, A conveyance line characterized in that the conveyance carriage is configured to continuously move between the pit line, the floor surface line, and between them. A transport method for an automobile production line using the transport carriage according to any one of claims 1 to 5, wherein various assembly parts are assembled to a main body of the automobile as the base part. ,
Forming a pit line for moving the transport carriage by forming the first movement state and a floor line for moving the transport carriage by forming the second movement state;
Maintaining the state where the main body is positioned and placed on the plurality of posts by lifting the transfer carriage by a transfer device and moving between the pit line and the floor surface line, A transport method, wherein the transport cart is continuously moved between the pit line, the floor line, and between them.

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