CN215316601U - Bear formula passenger train chassis assembly welding, upset, transport and close and piece together frock in an organic whole - Google Patents

Abstract

The utility model provides a tool for assembling, welding, overturning, transferring and splicing a chassis of a load-bearing type passenger car, which comprises a plurality of independent tools, wherein each independent tool comprises a channel steel welding frame, a base surface is welded in the channel steel welding frame, the upper surface of the base surface is provided with a plurality of T-shaped groove table tops detachably connected with the base surface, and a plurality of positioning blocks can be detachably connected on the T-shaped groove table tops; a rope type underframe overturning device for realizing underframe overturning is fixed on the side surface of the base surface; a guide positioning mechanism for guiding and positioning is arranged between two adjacent independent tools, and a tool clamping device for combining the two adjacent independent tools into one tool is also arranged between the two adjacent independent tools; the utility model provides an electric type load-bearing passenger car chassis flexible tool which reduces the use area, improves the production efficiency and integrates chassis block assembly welding, overturning repair welding, transferring and splicing.

Description

Bear formula passenger train chassis assembly welding, upset, transport and close and piece together frock in an organic whole

Technical Field

The utility model relates to the technical field of passenger car manufacturing tools, in particular to a tool for assembling, welding, overturning, transferring and splicing a bottom frame of a load-bearing passenger car.

Background

The chassis of the load-bearing type passenger car is an essential part in the manufacturing process of the passenger car, and plays an important role in ensuring the size of the skirt edge of the passenger car and the flatness of the outer surface of the lower skirt edge. The problems of large occupied area, large workload and low production efficiency are mainly focused on the split welding of the bearing type underframe, the travelling crane transfer and the integral assembling station. In the prior art, when the bearing type chassis is assembled and welded, all parts are placed on the ground in a blocking and scattered mode for assembly and welding, and after the assembly and welding, the parts are subjected to block splicing welding, overturning repair welding, conveying to corresponding stations of a production line by a travelling crane, and splicing again through a positioning tool. This kind of production mode on the one hand place area occupied is big, the driving occupancy is high, and on the other hand chassis is transported yielding and is leaded to the size unable assurance, hardly guarantees lower skirt surface roughness.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the problems that the assembly welding of the chassis of the passenger car at a fixed position is carried to a fixed chassis tool by a travelling crane after the assembly welding is finished, the assembly welding is carried out again, the travelling crane occupancy rate is high, the occupied area of a field is large, the size precision is low, and the production efficiency is low, and the flexible tool integrates the assembly welding, the overturning, the transferring and the assembly of the chassis of the passenger car.

The technical scheme of the utility model is as follows:

bear formula passenger train chassis assembly welding, upset, transport and close and piece together in frock of an organic whole, include:

a plurality of independent frocks, every independent frock all includes:

welding a frame by using channel steel;

the base surface is welded inside the channel steel welding frame;

the table top of each T-shaped groove is detachably connected with the base surface;

each positioning block is detachably connected with the table top of the T-shaped groove;

the rope type underframe overturning device is fixed on the side surface of the base surface and used for realizing the overturning of the underframe;

the guide positioning mechanism is positioned between two adjacent independent tools and is used for guiding and positioning the adjacent independent tools;

and the tool clamping device is used for connecting two adjacent independent tools into a whole, and the plurality of independent tools are connected into a combined tool through the tool clamping device.

The above-mentioned guiding orientation mechanism includes:

the guide plate is hinged with the lower surface of the base surface of one independent tool through a first rotating shaft; the guide plate horizontally rotates around the lower surface of the base surface;

the positioning plate is positioned above the guide plate and matched with the guide plate; the positioning plate comprises an arc section and a straight arm section, the arc section is hinged to the side wall of the channel steel welding frame through a fifth rotating shaft, and a slot opening used for limiting the rotation of the guide plate when the positioning plate is vertically turned downwards is formed in the straight arm section;

the positioning pin and the positioning plate are fixed on the left side surface of the same channel steel welding frame;

and the positioning channel steel is fixed on the right side surface of the other independent tool and matched with the positioning pin to be used for positioning the adjacent independent tool.

Above-mentioned frock clamping device includes:

the first base is fixed at the left corner of the base surface of one independent tool;

the lower end of the rotating arm is connected with the first base through a second rotating shaft;

the vertical section of the U-shaped frame crosses the rotating arm and is connected with the rotating arm through a third rotating shaft;

one end of the rod body penetrates through a through hole formed in the horizontal section of the U-shaped frame and is fixedly connected with a stop block positioned in the U-shaped frame;

the tightening head is fixedly connected with the other end of the rod body;

the spring is sleeved on the side wall of the rod body positioned in the U-shaped frame;

the clamping block is fixed at the right corner of the base surface of the other independent tool; the clamping block is matched with the clamping head and used for connecting two adjacent independent tools into a combined tool.

Above-mentioned rope formula chassis turning device includes:

the second base is fixed on the side face of the channel steel welding frame;

the lower end of the upright post is hinged with the second base through a fourth rotating shaft;

the hook is fixed at the upper end of the upright post;

and the limiting element sequentially penetrates through the second base and the upright column and is used for limiting the rotation of the upright column.

Above-mentioned every independent frock still includes moving mechanism, moving mechanism includes:

the upper ends of the supporting legs are fixedly connected with the base surface;

the wheel reinforcing plate is fixed at the lower end of the supporting leg;

the steering wheel with the brake is fixedly connected with the wheel reinforcing plate;

and the motor driving wheel is fixed on the support, and the support is fixed on the lower surface of the base surface.

The positioning block comprises:

the positioning part is integrally of a rectangular plate-shaped structure, and the upper side of the plate body is provided with a groove matched with the chassis of the load-bearing type passenger car;

the fixing part comprises a supporting transverse plate and a supporting vertical plate; a T-shaped groove matched with the table surface of the T-shaped groove is fixed on the lower surface of the supporting transverse plate, and the supporting transverse plate is fixed on the table surface of the T-shaped groove through a bolt; the supporting vertical plate is vertically fixed on the supporting transverse plate, and the supporting vertical plate and the positioning part are connected into a whole through a fixing part.

The fixing piece is a bolt and a nut; a first through hole is formed in the lower side of the positioning part, and a plurality of second through holes which are different in height and matched with the first through holes are formed in the supporting vertical plate; the bolt penetrates through the first through hole and the second through hole in sequence to connect the supporting vertical plate and the positioning part into a whole.

The base surface is provided with a plurality of through holes convenient to clean.

The utility model has the beneficial effects that:

the utility model provides a flexible tool for assembling, welding, overturning, transferring and assembling an underframe of a bearing type passenger car, which is used for solving the problems of large occupied area of a field, high driving occupancy rate, material deformation and safety risk in air transportation of materials, size guarantee problem and lower skirt edge outer surface flatness in the process of assembling, welding, overturning, welding, transferring and assembling all parts of block-type scattered ground assembling and welding of the underframe, and overcoming the problems of material deformation and safety risk, overturning, welding, transferring and assembling of the underframe. The tool not only reduces the use area, improves the production efficiency, guarantees the size, improves the flatness of the outer surface of the lower skirt edge, but also can be temporarily combined into an underframe flow production line by a plurality of tools, and can be used for recombining the positioning blocks to quickly form a new underframe production line by recombining the tool and the recombination table board according to different types of automobiles.

Drawings

FIG. 1 is a schematic view of a splicing tool of the present invention;

FIG. 2 is a schematic view of an independent tool of the present invention;

FIG. 3 is a schematic view of the structure of the positioning pin and the positioning channel steel of the present invention;

FIG. 4 is a schematic view of the structure of the deflector of the present invention rotated to the lower surface of the base surface;

FIG. 5 is a schematic structural view of the tool clamping device of the present invention during clamping;

FIG. 6 is a schematic view of the tool clamping device of the present invention shown in the disengaged position;

FIG. 7 is a schematic structural view of the rope type underframe turnover device of the utility model in operation;

FIG. 8 is a schematic view of the structure of the guide plate and the positioning plate of the present invention;

FIG. 9 is a schematic view of a positioning block according to the present invention;

fig. 10 is a schematic structural view of a fixing portion according to the present invention.

Description of reference numerals:

1. positioning blocks; 11. a positioning part; 12. a groove; 13. a fixed part; 13a, supporting a transverse plate; 13b, a supporting vertical plate; 2. a T-shaped groove table surface; 3. a base surface; 4. a tool clamping device; 41. a first base; 42. A rotating arm; 43. a U-shaped frame; 44. a rod body; 45. tightening the head; 46. a spring; 47. a tightening block; 48. A stopper; 5. welding a frame by using channel steel; 6. a guiding and positioning mechanism; 61. a guide plate; 62. positioning a plate; 63. Positioning pins; 64. positioning channel steel; 7. a moving mechanism; 71. a support leg; 72. a wheel reinforcing plate; 73. A steering wheel with a brake; 74. a motor driving wheel; 8. a rope type chassis turnover device; 81. a second base; 82. a column; 83. hooking; 84. and a limiting element.

Detailed Description

An embodiment of the present invention will be described in detail with reference to fig. 1 and 10, but it should be understood that the scope of the present invention is not limited by the embodiment.

Example 1:

as shown in fig. 1, the assembly welding, overturning, transferring and splicing tool for the underframe of the load-bearing passenger car provided by the embodiment of the utility model comprises a plurality of independent tools, each independent tool comprises a channel steel welding frame 5, a base surface 3 is welded in the channel steel welding frame 5, the upper surface of the base surface 3 is detachably connected with a plurality of T-shaped groove table tops 2 through bolts, and the T-shaped groove table tops 2 are fixed at different positions of the base surface 3 through bolts to meet the requirements of different car types; a positioning block 1 is fixedly connected to part of the T-shaped groove table top 2 through bolts, the positioning block 1 is fixedly connected with the T-shaped groove table top 2 through bolts, and the positioning block 1 can be fixed at different positions of the T-shaped groove table top 2 through bolts to meet the requirements of different vehicle types; the left side and the right side of the base surface 3 are respectively fixed with a rope type chassis turnover device 8, and the rope type chassis turnover device 8 is used for realizing the turnover of the chassis.

Furthermore, a plurality of through holes convenient to clean are formed in the base surface 3.

The quantity of independent frock is preferred three, places before three independent frock, in, after to carry out guiding orientation through guiding orientation mechanism between the adjacent independent frock, still link into an integrated entity through frock clamping device 4 between the adjacent independent frock, a plurality of independent frock links into one piece through frock clamping device 4 and closes the frock of piecing together.

The tool for assembling, welding, overturning, transferring and splicing the underframe of the bearing type passenger car provided by the utility model not only can reduce the use area, improve the production efficiency, ensure the size and improve the flatness of the outer surface of the lower skirt edge, but also can temporarily form an underframe flow production line by a plurality of tools, and a new underframe production line can be quickly formed by recombining the tools, recombining the table top and recombining the positioning blocks according to different car types.

According to the assembly welding, overturning, transferring and splicing integrated tool for the underframe of the load-bearing type passenger car, the section bar of the load-bearing type underframe is positioned through the positioning block 1, the minimum length dimension error of the underframe beam connected with the side wall is ensured, the welding deformation is small during welding, and therefore the surface flatness of the lower skirt edge can be improved; the utility model achieves the purpose of recombining the table tops by moving the table top 2 of the T-shaped groove back and forth, moving the table top left and right and increasing or reducing the number of the table tops, and meanwhile, rearranging the positioning blocks 1 according to the drawings of the underframe of different vehicle types to achieve the purposes of quick assembly welding, turnover, repair welding and front, middle and rear positioning, tightening and splicing to form a new underframe production line; the utility model is suitable for various types of vehicles, namely, the chassis is assembled and welded by using profiles of different specifications, and the structure of the bearing type passenger car specified in GB7258 is suitable.

Example 2:

in this embodiment, based on embodiment 1, as shown in fig. 3 and 4, the guiding and positioning mechanism includes a guide plate 61, the guide plate 61 is hinged to the left side surface of the channel steel welding frame 5 of one of the independent tools through a rotating shaft, the guide plate 61 is a horizontally rotating guide plate 61, when the guiding mechanism is not used, the guide plate 61 is horizontally rotated until the lower surface of the channel steel welding frame 5 is hidden, and when the guiding mechanism is used, the guiding mechanism is horizontally rotated to the position shown in fig. 1 to be combined with another adjacent independent tool to play a guiding role; a positioning plate 62 matched with the guide plate 61 is further arranged above the guide plate 61, the positioning plate 62 comprises an arc section and a straight arm section, the arc section is hinged to the side wall of the channel steel welding frame 5 through a fifth rotating shaft, and a slot opening used for limiting the guide plate 61 to rotate when the positioning plate 62 is vertically turned downwards is formed in the straight arm section; still weld on channel-section steel welding frame 5 and have locating pin 63, locating pin 63 all is located channel-section steel welding frame 5 with deflector 61 and locating plate 62 on same side, and locating pin 63 is used for fixing a position adjacent independent frock with the cooperation of the location channel-section steel 64 of fixing at another independent frock right flank.

Further, as shown in fig. 5 and 6, the tool clamping device includes a first base 41, a rotating arm 42, a U-shaped frame 43, a rod 44, a clamping head 45, a spring 46, a clamping block 47, and a stopper 48; the first base 41 is fixed at the left corner of the base surface 3 of an independent tool, the first base 41 is hinged with the lower end of the rotating arm 42 through a second rotating shaft, the side wall of the rotating arm 42 is also provided with a U-shaped frame 43 crossing two sides of the rotating arm 42, and the vertical two sides of the U-shaped frame 43 are connected with the rotating arm 42 through a third rotating shaft; one end of the rod body 44 penetrates through a through hole formed in the horizontal section of the U-shaped frame 43 and is fixedly connected with a stop block 48 positioned in the U-shaped frame 43, the other end of the rod body 44 is fixedly connected with a clamping head 45, and a spring 46 is sleeved on the part, positioned in the U-shaped frame 43, of the rod body 44; the clamping head 45 is matched with a clamping block 47 fixed at the right corner of the base surface 3 of another independent tool, and the clamping head 45 is matched with the clamping block 47 and used for connecting two adjacent independent tools into a combined tool.

According to the tool for assembling, welding, overturning, transferring and splicing the underframe of the load-bearing type passenger car, when adjacent independent tools are connected, the adjacent independent tools are positioned by using the guide positioning mechanism, and when the adjacent independent tools are positioned, the guide plate 61 is rotated firstly, and is horizontally rotated out from the lower surface of the channel steel welding frame 5 and rotated to the position shown in figure 3. Then, the positioning plate 62 is rotated, the straight arm section of the positioning plate 62 rotates downwards, and the slot opening can block the guide plate 61 in the process of the downward rotation of the straight arm section to limit the rotation of the guide plate 61. At the moment, the guide plate 61 can rub the lower surface of the channel steel welding frame 5 of the adjacent independent tool, and the positioning pin 63 is inserted into the through hole formed in the positioning channel steel 64 of the adjacent independent tool, so that the two independent tools are positioned;

after guiding and positioning, two adjacent independent tools are connected into a combined tool by using a tool clamping device, when clamping is performed, the rotating arm 42 is rotated firstly, the rotating arm 42 drives the U-shaped frame 43, the rod body 44 and the clamping head 45 to move, at the moment, the spring 46 sleeved on the rod body 44 is in a relaxed state, when the rotating arm 42 rotates to clamp the clamping head 45 and the clamping block 47, the rotating arm 42 is rotated reversely, at the moment, the clamping head 45 applies a clamping force to the clamping block 47, the U-shaped frame 43 continuously rotates to move towards the right side along with the rotating arm 42, the U-shaped frame 43 moves to compress the spring 46, one end of the spring 46 applies pressure to the U-shaped frame 43, the other end of the spring 46 applies pressure to the stop block 45, and the adjacent independent tools are connected into the combined tool by the spring 46 in a compressed state.

Example 3:

this embodiment is based on embodiment 1, the rope type underframe turnover device 8 comprises a second base 81, a vertical column 82, a hook 83 and a limiting element 84; the second base 81 is fixed on the side surface of the channel steel welding frame 5, a hook 83 is fixed at the upper end of the upright 82, the lower end of the upright 82 is hinged to the second base 81 through a fourth rotating shaft, and when the upright 82 rotates to a vertical position, the upright 82 is sequentially penetrated through the second base 81 and the upright 82 to limit the rotation of the upright 82 by using a limiting element 84.

According to the rope type underframe turnover device 8 provided by the utility model, the limiting element 84 selects a fixing bolt, when the rope type underframe turnover device 8 is used, the upright post 82 is rotated firstly, one end of a rope for fixing the underframe of the bearing type passenger car is fixed on the underframe of the bearing type passenger car after the upright post 82 is rotated to a vertical position, the other end of the rope is fixed on the hook 83, at the moment, the fixing bolt penetrates through holes formed in the second base 81 and the upright post 82 to limit the rotation of the upright post 82, and then a pulley is hung on the hook to realize the turnover of the underframe.

Example 4:

in this embodiment, based on embodiment 1, each independent tool further includes a moving mechanism, the moving mechanism includes a leg 71, and the upper end of the leg is fixedly connected to the channel steel welding frame 5; a wheel reinforcing plate 72 fixed to the lower end of the leg 71; a steering wheel 73 with a brake, which is fixedly connected with the wheel reinforcing plate 72; the motor driving wheel 74 is connected to the channel steel welding frame 5 through a motor driving shaft supporting leg to realize motor driving, wheel supporting and rotating.

Example 5:

this embodiment is based on embodiment 1, and the positioning block 1 includes a positioning portion 11 and a fixing portion 13. The positioning part 1 is integrally of a rectangular plate-shaped structure, and the upper side of the plate body is provided with a groove 12 which is used for being matched with the chassis of the load-bearing type passenger car; a fixing part 13 comprising a supporting transverse plate 13a and a supporting vertical plate 13 b; a T-shaped groove matched with the T-shaped groove table board 2 is fixed on the lower surface of the supporting transverse plate 13a, and the supporting transverse plate 13a is fixed on the T-shaped groove table board 2 through bolts; the supporting vertical plate 13b is vertically fixed on the supporting transverse plate 13a, and the supporting vertical plate 13b and the positioning part 11 are connected into a whole through a fixing piece.

Further, the fixing piece is a bolt and a nut; a first through hole is formed in the lower side of the positioning part 11, and a plurality of second through holes which are different in height and matched with the first through hole are formed in the supporting vertical plate 13 b; the bolt sequentially penetrates through the first through hole and the second through hole to connect the supporting vertical plate 13b and the positioning part 11 into a whole.

The assembly welding, overturning, transferring and assembling integrated tool for the bearing type passenger car underframe provided by the utility model has the advantages that the structure of the positioning block 1 is shown in the attached figure 9, the positioning part 11 is provided with the groove 12, and the groove 12 is used for clamping the bearing type passenger car underframe. The fixing portion 13 is used for supporting the positioning portion 11, the fixing portion 13 and the positioning portion 11 are detachably connected through bolts, a plurality of second through holes with different heights are formed in a supporting vertical plate 13b of the positioning portion 11, and the bolts sequentially penetrate through the first through holes and any one of the second through holes to enable the supporting vertical plate 13b and the positioning portion 11 to be connected into a whole, so that the height of the positioning portion 11 can be adjusted simply and conveniently, and the positioning portion is suitable for different types of load-bearing type passenger car chassis.

The working principle is as follows:

when the combined tool is used, two adjacent independent tools are connected into a combined tool, the combined tool is positioned by using the guide positioning mechanism, and the guide plate 61 is rotated to horizontally rotate out from the lower surface of the channel steel welding frame 5 to the position shown in figure 1 when the combined tool is positioned. Then, the positioning plate 62 is rotated, the straight arm section of the positioning plate 62 rotates downwards, and the slot opening can block the guide plate 61 in the process of the downward rotation of the straight arm section to limit the rotation of the guide plate 61. At this moment, the guide plate 61 can rub the lower surface of the channel steel welding frame 5 of the adjacent independent tool, the positioning pin 63 is inserted into the through hole formed in the positioning channel steel 64 of the adjacent independent tool, and the two independent tools are positioned.

After guiding and positioning, two adjacent independent tools are connected into a combined tool by using a tool clamping device, when clamping is performed, the rotating arm 42 is rotated firstly, the rotating arm 42 drives the U-shaped frame 43, the rod body 44 and the clamping head 45 to move, at the moment, the spring 46 sleeved on the rod body 44 is in a relaxed state, when the rotating arm 42 rotates to clamp the clamping head 45 and the clamping block 47, the rotating arm 42 is rotated reversely, at the moment, the clamping head 45 applies a clamping force to the clamping block 47, the U-shaped frame 43 continuously rotates to move towards the right side along with the rotating arm 42, the U-shaped frame 43 moves to compress the spring 46, one end of the spring 46 applies pressure to the U-shaped frame 43, the other end of the spring 46 applies pressure to the stop block 45, and the adjacent independent tools are connected into the combined tool by the spring 46 in a compressed state.

The combination is pieced together the frock equipment and is accomplished back and will bear each horizontal and vertical rectangular pipe joint of formula passenger train chassis on locating piece 1, and locating piece 1 of joint on the rectangular pipe can change specific joint position according to the in service behavior, adapts to the formula passenger train chassis that bears of different grade type and carries out the assembly welding.

Utilize rope formula chassis turning device 8 to realize the upset of 180 degrees after the assembly welding, turning device's couple one end is fixed on the rope, and the rope other end is fixed on the passenger train, later utilizes turning device to realize 180 degrees upsets repair welding one side, utilizes turning device upset 180 degrees after repair welding one side to reset, carries out the assembly welding after resetting.

In conclusion, the assembly welding, overturning, transferring and splicing integrated tool for the underframe of the load-bearing passenger car can reduce the use area and improve the production efficiency, integrates the assembly welding, overturning repair welding, transferring and splicing of the underframe in blocks, ensures the size and improves the flatness of the outer surface of the lower skirt edge, and can quickly form a new underframe production line by recombining the tool, recombining the table top and recombining the positioning blocks according to different car types.

The above disclosure is only for a few specific embodiments of the present invention, however, the present invention is not limited to the above embodiments, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.

Claims (8)

1. The utility model provides a bear formula passenger train chassis assembly welding, upset, transportation and close and piece together in frock of an organic whole, its characterized in that includes:

a plurality of independent frocks, every independent frock all includes:

a channel steel welding frame (5);

a base surface (3) welded inside the channel steel welding frame (5);

the T-shaped groove table tops (2) are detachably connected with the base surface (3);

the positioning blocks (1) are detachably connected with the T-shaped groove table top (2);

the rope type underframe overturning device (8) is fixed on the side surface of the base surface (3) and is used for realizing the overturning of the underframe;

the guide positioning mechanism (6) is positioned between two adjacent independent tools and is used for guiding and positioning the adjacent independent tools;

and the tool clamping device (4) is used for connecting two adjacent independent tools into a whole, and the plurality of independent tools are connected into a combined tool through the tool clamping device (4).

2. A tool for assembling, welding, overturning, transferring and splicing a chassis of a load-bearing passenger car according to claim 1, wherein the guiding and positioning mechanism comprises:

the guide plate (61) is hinged with the lower surface of the base surface (3) of one independent tool through a first rotating shaft; the guide plate (61) horizontally rotates around the lower surface of the base surface (3);

the positioning plate (62) is positioned above the guide plate (61) and matched with the guide plate (61); the positioning plate (62) comprises an arc section and a straight arm section, the arc section is hinged to the side wall of the channel steel welding frame (5) through a fifth rotating shaft, and a slot opening used for limiting the rotation of the guide plate (61) when the positioning plate (62) is vertically turned downwards is formed in the straight arm section;

the positioning pin (63) and the positioning plate (62) are fixed on the left side face of the same channel steel welding frame (5);

and the positioning channel steel (64) is fixed on the right side surface of the other independent tool and matched with the positioning pin (63) to be used for positioning the adjacent independent tool.

3. A tool for assembling, welding, turning, transferring and splicing a chassis of a passenger car according to claim 1, wherein the tool clamping device (4) comprises:

the first base (41) is fixed at the left corner of the base surface (3) of one independent tool;

a rotating arm (42) with the lower end connected with the first base (41) through a second rotating shaft;

a U-shaped frame (43), wherein the vertical section of the U-shaped frame (43) crosses the rotating arm (42) and is connected with the rotating arm (42) through a third rotating shaft;

one end of the rod body (44) penetrates through a through hole formed in the horizontal section of the U-shaped frame (43) and is fixedly connected with a stop block (48) positioned inside the U-shaped frame (43);

the tightening head (45) is fixedly connected with the other end of the rod body (44);

the spring (46) is sleeved on the side wall of the rod body (44) positioned inside the U-shaped frame (43);

the clamping block (47) is fixed at the right corner of the base surface (3) of the other independent tool; the clamping block (47) is matched with the clamping head (45) and is used for connecting two adjacent independent tools into a combined tool.

4. A tool for assembling, welding, turning, transferring and splicing a chassis of a load-bearing passenger car as claimed in claim 1, wherein the rope type chassis turning device (8) comprises:

the second base (81) is fixed on the side face of the channel steel welding frame (5);

the lower end of the upright post (82) is hinged with the second base (81) through a fourth rotating shaft;

a hook (83) fixed to the upper end of the upright (82);

and the limiting element (84) penetrates through the second base (81) and the upright post (82) in sequence and is used for limiting the rotation of the upright post (82).

5. A tool for assembling, welding, overturning, transferring and splicing underframe of passenger car according to claim 1, wherein each tool comprises a moving mechanism (7), and the moving mechanism (7) comprises:

the upper ends of the supporting legs (71) are fixedly connected with the base surface (3);

a wheel reinforcing plate (72) fixed to the lower end of the leg (71);

the steering wheel (73) with a brake is fixedly connected with the wheel reinforcing plate (72);

and the motor driving wheel (74) is fixed on a bracket, and the bracket is fixed on the lower surface of the base surface (3).

6. The assembly welding, overturning, transferring and splicing tool for the underframe of the load-bearing passenger car as claimed in claim 1, wherein the positioning block (1) comprises:

the positioning part (11) is integrally of a rectangular plate-shaped structure, and the upper side of the plate body is provided with a groove (12) which is used for being matched with the chassis of the load-bearing type passenger car;

a fixing part (13) comprising a supporting transverse plate (13a) and a supporting vertical plate (13 b); a T-shaped groove matched with the T-shaped groove table board (2) is fixed on the lower surface of the supporting transverse plate (13a), and the supporting transverse plate (13a) is fixed on the T-shaped groove table board (2) through a bolt; the supporting vertical plate (13b) is vertically fixed on the supporting transverse plate (13a), and the supporting vertical plate (13b) and the positioning part (11) are connected into a whole through a fixing piece.

7. A tool for assembling, welding, overturning, transferring and splicing a chassis of a load-bearing passenger car according to claim 6, wherein the fixing pieces are bolts and nuts; a first through hole is formed in the lower side of the positioning part (11), and a plurality of second through holes which are different in height and matched with the first through hole are formed in the supporting vertical plate (13 b); the bolt sequentially penetrates through the first through hole and the second through hole to connect the supporting vertical plate (13b) and the positioning part (11) into a whole.

8. The assembly welding, overturning, transferring and splicing tool for the underframe of the load-bearing passenger car as claimed in claim 1, wherein the base surface (3) is provided with a plurality of through holes convenient for cleaning.

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