CN1835864A - Apparatus and method of transferring vehicle body - Google Patents

Abstract

A transfer apparatus (1) vertically transfers a vehicle body (M) between a hanging/transportation line (HL) for transporting the vehicle body (M) with the body (M) hanged from the above by a transportation hanger (H) traveling along a transportation rail (SR) and a support/transportation line (SL) for transporting the vehicle body (M) while supporting the lower side of the body (M). The transfer apparatus (1) is installed continuously from the transportation rail (SR) of the hanging/transportation line (HL) and has a lifting rail (2) on which the transportation hanger (H) can travel and a portal-type lifting apparatus (3) for vertically moving the lifting rail (2).

Description

Vehicle transfer device and vehicle transfer method

technical field

The present invention relates to a vehicle conveying apparatus that conveys a vehicle body between a suspended conveying line and a supporting conveying line by conveying the vehicle body in an upward or downward direction. Here, the suspended type conveyor line uses a conveyor hanger to suspend the vehicle body and conveys the vehicle body, while the support type conveyor line holds the bottom side of the vehicle body and conveys the vehicle body.

In addition, the present invention relates to a vehicle transfer method.

Background technique

Traditionally, vehicle assembly lines consist of suspended and supported conveyor lines. Suspended conveyor lines use conveyor hangers to suspend the vehicle body to mount various components such as the engine, transmission, exhaust nozzles, and tires, usually from the underside of the vehicle body. Hereinafter, these components are also denoted by the term "bottom side components".

The support type conveyor line uses a flat conveyor to hold the car body from the bottom side of the car body to install external parts etc., which are usually installed from the upper side of the car body.

In such an assembly line, there is provided a vehicle body transfer device for transferring the vehicle bodies from the overhead conveyor line to the support conveyor line.

As an example of these types of vehicle body conveying apparatuses, a vehicle body conveying apparatus disclosed in Japanese Unexamined Patent Publication No. 2002-60052 has been found.

The equipment disclosed in this Japanese Unexamined Patent Publication includes: guide posts positioned on both sides of the vehicle body to be conveyed, a lift unit that moves up and down along the guide posts, moves in the horizontal direction and changes its overall A frame long enough to support the vehicle body, and a vehicle body holding device for receiving the vehicle body from the frame.

In this vehicle body conveying apparatus, a vehicle body supported by a conveying hanger from its bottom side and conveyed from a conveying line is picked up to disengage the vehicle body from the conveying hanger. Then, the vehicle body is transferred to the vehicle body transfer facility.

Next, in the vehicle body transfer device, the vehicle body is transferred in the downward direction and received by a holding unit adapted to move in the up and down direction and provided in the vehicle body holding device. Then, the vehicle body is placed on the ground (supported conveyor line) by lowering the holding unit, and the vehicle body placed on the ground is transported to the next process.

In this conventional vehicle assembly line, an inclined guide rail inclined in an upward direction is provided between a mounting process of bottom side components and a vehicle body conveying process (equipment). This is because it is necessary to transfer the vehicle body to the vehicle body holding device of the vehicle body transfer device at a predetermined height, or to return the conveying hanger to the start of the conveying line of the vehicle assembly line.

However, in this conventional vehicle assembly line, the overall length of the conveying line becomes long in order to provide inclined rails.

Here, mounting the tires in the vehicle body within the vehicle body conveying facility is one of the methods of shortening the conveying line. However, the mounting of the tires becomes difficult due to the vehicle body holding equipment provided in the vehicle body conveying equipment. This is because a sufficient work space cannot be secured within the vehicle body conveying equipment.

In addition, in this conventional vehicle body transfer device, since the structure of the vehicle body holding device or the lifting unit becomes a complicated structure, an excessively high manufacturing cost is required.

Accordingly, there is a need for a vehicle transfer apparatus that can shorten the overall line length of a vehicle assembly line and that can minimize the overall manufacturing cost of the vehicle assembly line. In addition, there is a need for a vehicle delivery method that satisfies these requirements.

Contents of the invention

The invention relates to a vehicle transfer apparatus for transferring vehicle bodies between a suspended conveyor line and a supported conveyor line. Here, the suspended type conveyor line transports the vehicle body while suspending the vehicle body on a transport hanger traveling along the transport rail, and the support type conveyor line transports the vehicle body while maintaining the lower side of the vehicle body.

The car body conveying equipment includes a lifting guide rail and a lifting unit. The lift rail is disposed proximate to the conveyor rail and allows movement of the conveyor hanger along the lift rail. The lifting unit controls the movement of the lifting guide rail along the up and down direction.

According to the vehicle conveying apparatus, the bottom side member is installed in the vehicle body while the conveying hanger holding the vehicle body therein travels along the conveying rail of the supporting conveying line. Then, the transport hanger is moved toward the lift rail provided close to the transport guide rail, and stopped at a predetermined area of the lift rail. Next, the lifting guide rail is moved in a downward direction by the lifting unit. Thereby, the car bodies are placed directly on the supporting conveyor line from the transport hanger and are thus transferred to the supporting conveyor line.

In addition, according to the present invention, the vehicle body is transferred from the conveying hanger to the supporting conveying line by moving the elevating rail in the up and down direction. This allows to dispense with conventional equipment such as lifting equipment and vehicle body holding equipment, which are used to transfer the vehicle bodies from the conveying hanger to the supporting conveyor line. Thereby, the manufacturing costs required for the vehicle assembly line can be minimized.

In addition, according to the present invention, the vehicle body does not need to be supported at a predetermined height by the holding unit of the vehicle body holding device. It is possible to omit the inclined guide rails used in the installation process of connecting the bottom side parts and the vehicle body transfer process. Therefore, the overall length of the vehicle assembly line can be shortened.

In the vehicle conveying apparatus, it is preferable that the elevating unit changes the position of the elevating rail between positions in which the elevating rail is positioned at the same height as the conveying rail of the suspended conveying line (level), where the vehicle body is placed on the supporting conveyor line, and where the lift rail is positioned at the same height as a return rail for placing the The conveyor hanger is guided to the starting point of the suspended conveyor line.

Thus, the transport hanger can be returned to the start of the suspended conveyor line by moving the lift rail upwards until the lift rail becomes level with the return rail after placing the vehicle body on the supported conveyor line.

In addition to the above-mentioned benefits, according to the present invention, since the conveying hanger can be transferred to the return rail normally arranged above the conveying rail by moving the lifting rail in an upward direction, the inclination connecting the conveying rail and the return rail can be omitted guide. Therefore, the overall length of the vehicle assembly line can be shortened.

The present invention relates to a vehicle transfer method for transferring a vehicle body between a suspended conveyor line and a supported conveyor line. Here, the suspended type conveyor line transports the vehicle body while suspending the vehicle body on a transport hanger traveling along the transport rail, and the support type conveyor line transports the vehicle body while maintaining the lower side of the vehicle body.

The vehicle delivery method includes the following steps. That is, (1) transfer the conveying hanger holding the vehicle body therein to the lift rail disposed close to the conveying rail, (2) install the bottom side member into the vehicle body in the upstream region of the lift guide rail, (3) After stopping the transport hanger in the downstream region of the lift rail, placing the vehicle body on the supported conveyor line by lowering the lift rail, (4) disengaging the transport hanger from holding the vehicle body, and (5) After moving the lift rail in an upward direction until the lift rail becomes level with a return rail, the conveyor hanger is transferred to the return rail for guiding the conveyor hanger to the overhead conveyor The starting point of the line.

According to this vehicle conveying method, after conveying the conveying hanger traveling along the conveying rail of the suspended conveying line into the lifting rail, the bottom side member is mounted to the vehicle body supported by the conveying hanger at an upstream region of the lifting rail middle.

Then, when the installation of the bottom side part is completed, the conveying hanger is conveyed in the downward direction together with the elevating rail after being conveyed and stopped at a predetermined position in the downstream area of the elevating rail.

Thereby, the vehicle body supported by the conveying hanger is placed on the supported conveying line.

Then, the vehicle body is disconnected from the transport hanger and transported to the outside of the vehicle transport facility. In this case, the lift rail is moved upwards until the lift rail becomes level with the return rail, and then the transport hanger travels along the return rail after detaching from the car body and is guided to the start of the overhead conveyor line.

According to the invention, the vehicle body can be transferred from the conveying hanger to the supporting conveying line simply by lowering the lifting rail. This makes it possible to dispense with conventional equipment such as lifting equipment and vehicle body holding equipment, which are traditionally used to transfer vehicle bodies from the transfer hanger to the supporting conveyor line. Thus, the manufacturing cost required for the vehicle body assembly line can be minimized.

In addition, since the bottom side member can be installed in the car body in the car body transfer facility, it is possible to omit inclined guide rails for connecting the installation process of the bottom side member and the car body transfer process. Therefore, the overall length of the vehicle assembly line can be shortened.

Description of drawings

FIG. 1 is a side view showing a vehicle transfer device according to the present embodiment.

Fig. 2 is a front view showing in detail the gantry type lifting device of Fig. 1 .

Fig. 3 is a side view showing a state in which the conveying hanger holding the vehicle body therein is transferred from the conveying rail to the elevating rail.

Fig. 4 is a side view showing a state in which a vehicle body is placed on a supporting conveyor line by lowering the elevating rail.

Fig. 5 is a side view showing a state in which the elevating rail is moved upward after detaching from the car body.

Detailed ways

Preferred embodiments of the present invention will be described below with reference to these drawings.

Referring to FIG. 1 , a vehicle conveying facility 1 conveys a vehicle body M from a suspended conveying line HL provided on the upper side of the vehicle conveying (assembly) line to a support conveying line SL provided on the lower side of the vehicle conveying (assembling) line. .

Here, the overhead conveyor line HL is a conveyor line in which the vehicle body M is held by a self-propelled conveyor hanger H (hereinafter referred to as "conveyor hanger H") that travels along the conveyor rail SR, and in which The vehicle body M is transported while the vehicle body M is suspended on the transport hanger H. As shown in FIG.

The support conveyor line SL is a conveyor line in which the vehicle bodies M are conveyed while the tires T of the vehicle bodies M are held on a flat conveyor.

A return guide rail BR for guiding the transport hanger H to the start point of the overhead conveyor line HL is provided above the end point of the vehicle transfer apparatus 1 .

The suspended conveyor line HL and the supported conveyor line SL are coaxially arranged, that is, the suspended conveyor line HL and the supported conveyor line SL are arranged in a straight line along the conveying direction when each line is viewed from the top. In each conveying line, the vehicle bodies M are conveyed while pointing the front side of each vehicle body M in the conveying direction.

In the following description, the terms "up-down direction" and "left-right direction" refer to the up-down direction and the left-right direction of the vehicle body M, respectively. That is, the terms "right side", "left side", "front side" and "rear side" are defined according to the direction in which the vehicle body M is conveyed.

The vehicle conveying apparatus 1 basically includes an elevating rail 2 along which a conveyance hanger H travels and a pair of gantry-type elevating apparatuses 3 each for raising and lowering the elevating rail 2 .

The lifting guide rail 2 has the same structure as the conveying guide rail SR of the suspended conveying line HL, and is mainly composed of an upper guide rail 21 provided on the upper side, a lower guide rail 22 provided on the lower side, and both are used to connect the upper guide rail 21 and the lower guide rail 21. The channels 23 of the side rails 22 form.

As the upper guide rail 21 and the lower guide rail 22 , guide rails having a letter “I” shaped section are employed, and are arranged along the transport direction of the vehicle body M.

A connecting beam with a letter “C” cross section is used as the channel 23 , the top of the channel 23 is connected to the upper guide rail 21 , and the bottom of the channel 23 is connected to the lower guide rail 22 .

As shown in FIG. 1 , a pair of gantry-type lifting devices 3 are arranged along the conveying direction of the car body M.

In the following description, since each gantry type lifting device 3 has the same structure, one of the gantry type lifting devices 3 will be described in detail below, and the description of the other gantry type lifting device 3 will be omitted. illustrate.

Conveniently in FIG. 1 , the gantry type lifting device 3 arranged upstream is shown as a sectional view taken along the line A-A of FIG. A cross-sectional view taken along the line B-B.

As shown in FIG. 2 , the gantry type lifting device 3 is mainly composed of a pair of pillars 31 , a connecting beam 32 , a slider base 33 , a slider 34 and an electric hoist 35 . In this gantry type lifting apparatus 3, a slider base 33 is fixed to a column 31 through a connecting beam 32, and holds a slider 34 therein while allowing the slider 34 to move in the up and down direction. The electric hoist 35 is provided with a servo controller, and causes the slider 34 to move in the up and down direction.

The pillars 31 are provided on both sides in the left-right direction of the vehicle body M conveyed from the overhead conveyor line HL so that the vehicle body M is positioned therebetween. The pillar 31 is respectively provided at top and middle portions along the longitudinal direction thereof with connecting beams 32 extending inwardly (toward the vehicle body M).

The slider base 33 is formed by connecting three beam members 33a so that it has a cross-section in the shape of an angular letter "U". As can be seen from FIG. 2 , the slider base 33 is supported by the connection beam 32 with the beam member 33 a connecting the left and right beam members 33 a placed on the upper side.

Stoppers 33b extending inward and restricting the downward movement of the slider 34 are provided on the bottom sides of the left and right beam members 33a.

The slider 34 is formed by connecting three frames 34a such that it has a section in the shape of an angular letter "U". As can be seen from FIG. 2 , the slider 34 is provided in the slider base 33 with the frame 34 a connecting the left and right frames 34 a positioned on the lower side.

As can be seen from FIG. 2, each of the left and right frames 34a of the slider 34 is provided with support bars 34b, which extend in an outward direction and are firmly fixed to the beam members 33a.

The end portion of each support rod 34b opposite to the frame 34a is provided with a guide roller 34c which holds the slider base 33 from its front and rear sides and allows the slider 34 to slide in the up and down direction along the beam member 33a ( See Figure 1).

In the slider 34, a frame 34a connecting the left and right frames 34a is fixed at its bottom to the upper side rail 21, and at its top is fixed to a roller bracket 34e that rotatably holds a roller 34d.

Here, a chain 35a suspended from an electric hoist 35 is arranged around the roller 34d.

In addition, both ends of the frame 34a connecting the left and right frames 34a are firmly connected with the left and right frames 34a by using a reinforcement plate 34f having a substantially triangular shape in a front view.

An electric hoist 35 (hereinafter referred to as "hoist") controls the movement of the slider 34 in the up and down direction. More specifically, the elevator 35 moves the slider 34 upward by winding the chain 35a wound on the roller 34d, and moves the slider 34 downward by unwinding (lengthening) the chain 35a wound on the roller 34d. sports.

As shown in FIG. 1, the hoist 35 is suspended on the top frame of a turret 35b having a section in the shape of an angular letter "U" and fixed to a bottom frame 35d by using an elevating member 35c, thereby Position its top frame on the upper side. Here, the bottom frame 35d is fixed to a pole (not shown).

The hoist 35 changes the position of the lifting guide rail 2 to any position among the position P1, the position P2 and the position P3 under the control of the control unit. Here, the position P1 is a position where the elevating rail 2 is positioned at the same height as the conveying rail SR of the suspended conveying line HL (see FIG. 3 ), and the position P2 is a position where the vehicle body M is placed on the supporting conveying line SL ( See FIG. 4 ), and the position P3 is a position in which the elevator rail 2 is positioned at the same height as the return rail BR provided at a higher position than the delivery rail SR (see FIG. 5 ).

As shown in FIG. 1, the transport hanger H basically includes four guide units h1, a hanger bracket h2, and hanger arms h3. In the transport hanger H, each guide unit h1 is adapted to slide along the lower side guide rail 22, and each hanger arm h3 is arranged below a hanger bracket h2 provided below the guide unit h1.

As shown in FIG. 2, the guide unit h1 basically consists of four guide rollers h11, a support plate h12 and a fixing piece h13. Support plates h12 are provided on both sides of the lower side rail 22 in the up-down direction, and each support plate h12 is fixed to a fixing piece h13 having a letter "L" shape in a front view. A total of four guide rollers h11 are rotatably arranged on the support plate h12 so that each side in the left-right direction of the lower side guide rail 22 is sandwiched between these guide rollers h11. More specifically, the upper portion 22a and the lower portion 22b of the lower side guide rail 22 are respectively sandwiched between guide rollers h11 arranged on each support plate h12.

In the current embodiment, since four guide rollers h11 are arranged in total, each guide unit h1 can move along the lower side guide rail 22 without misalignment in the width direction.

As shown in FIG. 1, two of the four guide units h1, that is, the guide unit h1 positioned at the middle portion of the four guide units h1 (hereinafter, these guide units will be referred to as "central guide units"), are provided with a convex The edge portion h14 and a roller h15. An upwardly extending flange portion h14 is provided on the support plate h12, and rotatably supports the roller h15 therein. Here, the circumference of the roller h15 is adapted to be in contact with the top surface of the lower side rail 22 .

In the current embodiment, a through hole through which a part of the roller h15 passes is provided on a suitable area of the support plate h12 to allow the roller h15 to contact the top of the lower side guide rail 22 .

The central guide unit h1 positioned upstream in the transport direction of the vehicle body M among the adjacent central guide units h1 is provided with a motor h16 for driving the roller h15 .

As shown in FIG. 2, an end portion of the fixing piece h13 of each central guide unit h1 is fixed to a shaft member h17 which is rotatably connected to a plate member h18.

As shown in FIG. 1, the fixing piece h13 of each guide unit h1 positioned at both ends of the conveying direction among the four guide units h1 is connected to a link h19 fixed to the shaft member at the other end thereof. on h17.

In the current embodiment, the connecting rod h19 is connected to the fixing part h13 while allowing the connecting rod h19 to rotate around the fixing part h13. This is because this arrangement allows the transport hanger H to follow the curve of the guide rail, eg the return guide rail BR.

As shown in FIG. 2, the hanger bracket h2 is hung on the plate member h18 by using four L-shaped brackets h21 fixed to the top of the hanger bracket h2. Here, only the two brackets h21 provided on the front side in FIG. 2 are shown in FIG. 2 .

The hanger base h31 supporting the top of the corresponding hanger arm h3 is fixed to the bottom of the hanger bracket h2 by four links h22.

A total of two hanger arms h3 are arranged on each side in the left-right direction with respect to the vehicle body M so that the vehicle body M is held by the hanger arms h3. Here, only the two hanger arms h3 provided on the front side in FIG. 2 are shown in FIG. 2 . As shown in Figure 1, the respective hanger arms h3 on each side are connected by a connecting beam h32.

In the present embodiment, as shown in FIG. 2 , the lower side of each hanger arm h3 provided on both sides of the vehicle body M is allowed to swing in the left-right direction. That is, each hanger arm h3 is able to pivot about its top side.

A support arm h33 holding the jacking point JP of the vehicle body M is pivotably provided on the bottom side of each hanger arm h3, and the support arm h33 is integrated with a lever h34 directed toward the direction relative to the vehicle body M. extend in the opposite direction.

As shown in FIG. 1 , the flat conveyor SC is arranged such that its origin point is below the end point of the lift rail 2 .

Arm release units 4 having crank arms 41 to be brought into contact with the rod h34 of the conveyance hanger H are provided on both sides of the slab conveyor SC. In this embodiment, since a total of four hanger arms h3 are used to hold the vehicle body M, four arm release units 4 are provided in total. That is, two arm release units 4 are provided on each side of the slab conveyor SC.

The arm release unit 4 changes the position of the support arm h33 between the vehicle holding position and the vehicle release position by rotating the lever h34 with the crank arm 41 . Here, if the support arm h33 is positioned at the vehicle holding position, the support arm h33 is directed in the vertical direction with respect to the conveying direction of the vehicle body M (see FIG. 2 ). On the other hand, if the support arm h33 is positioned at the vehicle release position, the support arm h33 is directed in a parallel direction with respect to the transport direction of the vehicle body M. As shown in FIG.

Next, a vehicle transfer method using the vehicle transfer device 1 will be described.

Referring to FIG. 3 , when the installation of various components, such as suspension, engine, and exhaust pipe, etc., which are generally installed from the bottom side of the vehicle body M, is completed in the suspended conveying line HL, the conveyance of the vehicle body M is maintained therein. The hanger H moves toward the lifting rail 2 arranged close to the conveying rail SR. Then, the transport hanger H is transported to the vehicle transport facility 1 (step 1).

Next, in this vehicle conveyance apparatus 1, each tire T is mounted in the vehicle body M while the conveyance hanger H is positioned in the upstream region of the lift rail 2 (step 2).

As shown in FIG. 4 , when the conveyance hanger H reaches a predetermined position in the downstream area of the lift rail 2 , the conveyance hanger H is stopped. Then, the lifting guide rail 2 is moved downward until the lifting guide rail 2 reaches a predetermined height. Thereby, the vehicle body M is directly placed on the support type conveying line SL from the conveying hanger H (step S3).

Next, the vehicle body M is released from the transport hanger H by changing the position of each support arm h33 from the vehicle holding position to the vehicle releasing position according to the actuation of the arm releasing unit 4 (step 4).

Then, as shown in FIG. 5, after moving the elevator rail 2 in the upward direction until the elevator rail 2 becomes equal to the return rail BR, the transport hanger H is transferred to the return rail BR (step 5).

According to the current embodiment, the following benefits can be obtained.

In the present embodiment, the vehicle body M is transferred from the conveying hanger H to the supporting conveying line SL by moving the elevating rail 2 in the up and down direction. This allows to dispense with conventional equipment such as lifting equipment and vehicle body holding equipment, which are used to transfer the vehicle bodies from the conveying hanger to the supporting conveyor line. Thereby, the manufacturing cost required for the vehicle assembly line (vehicle conveying line) can be minimized.

In addition, in the present embodiment, since the vehicle body M can be directly transferred from the conveying hanger H to the supporting conveying line SL, unlike the case of a conventional vehicle assembly (conveying) line, the conveying of the vehicle body M to the lower side conveying The wire does not require multiple steps for transferring the vehicle body M. Thereby, the number of steps for transferring the vehicle body M can be minimized.

Also in the present embodiment, since the conveyance hanger H can be transferred to the return rail BR provided at a position higher than the conveyance rail SR by lifting the elevating guide rail 2 in the upward direction, there is no need for a method for placing the conveyance hanger. The machine is transported to the inclined guide rail of the return guide rail set at a higher position. Thereby, the overall length of the vehicle assembly (conveying) line can be shortened.

Also, in the present embodiment, there is no need for a specific device for receiving the vehicle body M and provided below the elevating rail 2 of the vehicle conveying device 1 . Thereby, installation of bottom-side members (for example, tires T) to be mounted from the bottom side of the vehicle body M can be performed within the vehicle conveyance apparatus 1 .

Thereby, it is possible to omit the inclined guide rails required when the mounting process for mounting the bottom side member to the vehicle body and the vehicle body conveying process using the vehicle conveying equipment are arranged separately in the vehicle conveying line.

Therefore, in the present invention, since it is possible to omit the inclined guide rail connecting the mounting process of the bottom side member and the vehicle body conveying process, the total length of the conveying line can be shortened.

Although a preferred embodiment of the invention has been disclosed, it will be understood by those skilled in the art that various changes and modifications can be made therein without departing from the scope of the invention as represented by the appended claims.

In the above-described embodiments, the vehicle conveying equipment for conveying the vehicle body from the suspended conveying line provided on the upper side of the vehicle assembly (conveying) line to the supported conveying line provided on the lower side of the vehicle conveying line has been performed. explained. However, the present invention is not limited thereto. For example, the vehicle transfer facility may transfer the vehicle body from the support type conveyor line SL provided on the lower side of the vehicle conveyor line to the suspension type conveyor line provided on the upper side of the vehicle conveyor line.

In addition, the total length of the lifting guide rails and the number of gantry-type lifting devices can be appropriately changed.

Claims (3)

1, a kind of vehicle body transfer apparatus, this vehicle body transfer apparatus is used for transmitting car body between suspension type travel line and support type travel line, this suspension type travel line is carried car body on the conveying hanger that body suspension is being advanced along conveying, and this support type travel line is carried car body when keeping the downside of car body, and this vehicle body transfer apparatus comprises:

Riser guide, it is arranged near described conveying and allows described conveying hanger to move along this riser guide; With

Lifting unit, it controls the motion along the vertical direction of described riser guide.

2, vehicle body transfer apparatus as claimed in claim 1 is characterized in that,

Described lifting unit changes the position of described riser guide between with upper/lower positions, promptly, wherein said riser guide is positioned at the position of the conveying equal-height position of described suspension type travel line, wherein described car body is placed on position on the described support type travel line and wherein said riser guide is positioned at the position of returning the guide rail equal-height position with one, and this returns the starting point that guide rail is used for described conveying hanger is guided to described suspension type travel line.

3, a kind of vehicle transfer approach, be used between suspension type travel line and support type travel line, transmitting car body, this suspension type travel line is carried car body on the conveying hanger that body suspension is being advanced along conveying, and this support type travel line is carried car body when keeping the downside of car body, and this method may further comprise the steps:

The conveying hanger that is keeping car body therein is sent to the riser guide of being arranged near conveying;

In the upstream region of riser guide, lower side member is installed in the car body;

In the downstream area of riser guide, make and carry after hanger stops, car body being placed on the support type travel line by riser guide is descended;

Make and carry the maintenance of hanger disengagement car body; And

Make riser guide along upward to move up to riser guide become with one return guide rail contour after, will carry hanger to be sent to this and return guide rail, this returns the starting point that guide rail is used for described conveying hanger is guided to described suspension type travel line.

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