Second-row seat fixing structure of commercial vehicle

Abstract

The application discloses a commercial vehicle second-row seat fixing structure, which comprises a vehicle body bottom plate, a safety belt fixator and a seat leg arranged on the front surface of the vehicle body bottom plate, a backside fixing beam of the vehicle body bottom plate, a seat fixing groove box fixed between the fixing beam and the vehicle body bottom plate, a right longitudinal beam and a left longitudinal beam fixed at the bottom of the fixing beam, one end of the right longitudinal beam and the left longitudinal beam being fixed on the back surface of the fixing beam, the other end of the right longitudinal beam and the left longitudinal beam being fixed on the back surface of the vehicle body bottom plate, a safety belt fixing groove box one being fixed in the right longitudinal beam, and a safety belt fixing groove box two being fixed in the left longitudinal beam. The groove box structure is adopted in the application, the stress area of the seat and the safety belt fixing point is increased, the stress concentration phenomenon is avoided, the seat and the safety belt are prevented from being separated from the fixing, and personal injury is caused; part of Z-direction shearing force is converted into horizontal direction tensile stress, the concentrated load is reduced, plastic deformation or even tearing and damage of the components are avoided, and the strength of the seat and the safety belt assembly and the safety of passengers are improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of automobile accessories, in particular to a second-row seat fixing structure of a commercial vehicle. BACKGROUND

[0002] In the design and development process of a vehicle body, many factors must be considered. The fixing strength of a seat safety belt is a national mandatory standard, and its importance is self-evident, and should be a core concern in the design. However, at present, most designers mainly rely on personal experience to carry out design work, and in the early stage of the project, there is a lack of effective verification means to ensure the feasibility of the design. The seat and safety belt assembly is a key component of the occupant restraint system, which closely links the occupant and the vehicle body together, and its performance directly affects the comfort and passive safety of the vehicle. When the vehicle is involved in a collision or rollover accident, if the safety belt assembly cannot firmly restrain the occupant in the seat, or if the surrounding area of the safety belt and seat fixing point is torn or broken, the seat will be pulled out of the fixing point, which may cause the occupant to collide with other parts in the vehicle, causing injury to the occupant. Accident statistics show that a large part of the occupant injuries are caused by the secondary collision of the occupant and other vehicle parts. Therefore, the passive safety performance of the automobile seat is attracting more and more attention.

[0003] The seat is usually fixed by bolts and the vehicle body floor. In order to make the seat effectively protect the occupant in a collision, it is necessary to require that the seat and related safety devices and the fixing point of the vehicle body do not fail, and therefore it is necessary to optimize the design of the vehicle body structure strength under the seat pulling safety working condition. SUMMARY

[0004] The purpose of the present application is to solve the problems raised in the background art, and a second-row seat fixing structure of a commercial vehicle is provided. The components of the disclosed structure are provided with a groove box structure, which increases the stress area of the seat and safety belt fixing point, avoids stress concentration, causes the seat and safety belt to be separated from the fixing, and causes personal injury. Through the groove box structure of the components, part of the Z-direction shear force is converted into horizontal tensile stress, the Z-direction shear force is reduced, thereby reducing the concentrated load, avoiding plastic deformation or even tearing and damage of the components, and improving the strength of the seat and safety belt assembly and the safety of the passengers.

[0005] The technical scheme adopted by the application to solve the technical problems is:

[0006] The utility model provides a commercial vehicle second row seat fixed structure, including the vehicle body bottom plate, the vehicle body bottom plate front is provided with the seat leg and the safety belt fixer, the back side fixed setting crossbeam between the vehicle body bottom plate, the crossbeam is welded with the crossbeam bottom groove board, the crossbeam bottom groove board both sides are provided with the crossbeam welding skirt through the crossbeam flanging, and the crossbeam whole presents the groove type structure, guarantees the setting space of seat fixed groove box, and increases the structural strength of crossbeam.

[0007] As preferred, the crossbeam middle part is provided with a crossbeam bottom groove plate, both sides of the crossbeam bottom groove plate are provided with crossbeam welding skirt through crossbeam flanging, and the crossbeam as a whole presents a groove type structure, which not only guarantees the setting space of seat fixed groove box, but also increases the structural strength of crossbeam.

[0008] As preferred, the seat fixed groove box upper part is provided with a welding duckbill one, the welding duckbill one middle part is provided with a groove one, the crossbeam welding skirt top surface is provided with a crossbeam welding reinforcing groove, the crossbeam welding reinforcing groove is welded with the welding duckbill one, two crossbeam welding reinforcing grooves are provided with a crossbeam reinforcing rib, the crossbeam reinforcing rib is welded with the groove one, which increases the welding area, i.e. increases the structural strength, the crossbeam reinforcing rib and the groove one are provided with a reinforcing rib one, the crossbeam reinforcing rib and the reinforcing rib one bottom part are provided with a welding flanging one, the welding flanging one upper part is provided with a vertical welding flanging two, the welding flanging one is welded with the crossbeam bottom groove plate, and the welding flanging two is welded with the crossbeam flanging, the two welding surfaces are perpendicular to each other, which increases the stability of welding, the seat fixed groove box side surface is provided with an angle rib and a reinforcing rib one, which converts part of Z-direction shearing force into horizontal tensile stress, increases the structural Z-direction strength, and improves the rigidity of structure.

[0009] As preferred, the welding flanging one is provided with a plurality of circular ribs, the circular ribs are located below the corner between the groove two and the seat fixed groove box lower part, the circular ribs are arranged at the position where Z-direction shearing force is converted, i.e. the load concentration position of structure, which effectively increases the stability of welding between parts and the rigidity of structure.

[0010] As preferred, the right side of the upper part of the right side beam is provided with a welding plate, the lower part of the right side beam is provided with a bottom flat plate, the bottom flat plate is provided with a circular rib two, the strength of the bottom flat plate is increased by the circular rib two, the side of the bottom flat plate is provided with a longitudinal beam folding edge one, the upper edge of the bottom flat plate is provided with a longitudinal beam folding edge two, the upper part of the longitudinal beam folding edge one and the longitudinal beam folding edge two is provided with a welding flange five, the welding plate is welded with the back of the beam bottom groove plate, the longitudinal beam folding edge two is welded with the back of the beam folding edge, the welding flange five is welded with the car body bottom plate, the right side beam is welded from three sides, and is stably welded with the beam and the car body bottom plate. The left side beam and the right side beam are the same in structure.

[0011] As preferred, the welding plate is provided with a concave plate, the welding skirt of the beam is provided with a beam boss, the concave plate and the beam boss are matched and welded, the welding area is increased, and the concave and convex structure increases the strength of the structure horizontally.

[0012] As preferred, the left and right sides of the safety belt fixing groove box one are respectively provided with welding duckbills two, and the welding duckbills two are welded with the welding flange five.

[0013] As preferred, the upper and lower sides of the safety belt fixing groove box one are respectively provided with folding edges one, the outer side of the folding edge one is provided with a welding flange four, the left and right sides of the folding edge one are respectively provided with welding flanges three, the welding flange four is welded with the bottom flat plate, and the welding flange three is welded with the longitudinal beam folding edge one. The safety belt fixing groove box one is in a groove shape as a whole, is fixed in the right side beam by the three-sided welding mode, converts part of the Z-directional shear force into horizontal tensile stress, increases the Z-directional strength of the structure, improves the rigidity of the structure, and the safety belt fixing groove box two is the same in structure with the safety belt fixing groove box one.

[0014] As preferred, the top surface of the seat fixing groove box is provided with a circular hole one, the back surface of the seat fixing groove box is fixedly provided with a welding nut one, the circular hole one and the welding nut one are coaxial, and the seat leg and the seat fixing groove box are bolted on both sides of the car body bottom plate.

[0015] As preferred, the top surface of the safety belt fixing groove box one is fixedly provided with a welding nut two, and the safety belt fixing device and the safety belt fixing groove box one are bolted on both sides of the car body bottom plate.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] 1. The components of the structure are provided with groove box structures, the force bearing area of the seat and the safety belt fixing point is increased, stress concentration phenomenon is avoided, the seat and the safety belt are prevented from being separated from the fixing, and personal injury is caused; part of the Z-directional shear force is converted into horizontal tensile stress through the groove box structure of the components, the Z-directional shear force is reduced, concentrated load is reduced, plastic deformation and even tearing and damage of the components are avoided, and the strength of the seat and the safety belt assembly and the safety of passengers are improved.

[0018] 2. The structure is provided with grooves and reinforcing ribs at the welding position, the welding area is increased, the concave-convex structure increases the strength of the horizontal reverse structure, the welding surfaces between two components are perpendicular to each other, the stability of welding is increased, the welding surfaces in the structure are sequentially connected, a three-layer welding structure is formed, the seat leg is fixed through a welding nut one and a bolt fixing seat, the safety belt fixing device is fixed through a welding nut two and a bolt, the area of stress action is reduced, stress concentration is avoided, and the rigidity of the structure is improved.

[0019] 3. The structure is provided with a cross beam folding edge, a folding edge one is arranged on one side of the safety belt fixing groove box, a longitudinal beam folding edge one and a longitudinal beam folding edge two are arranged on the right longitudinal beam, the force transmission path is artificially set, the Z-direction strength is enhanced, and the rigidity of the component is improved.

[0020] 4. The structure is provided with a welding duckbill one, a welding flange one and a welding flange two, a cross beam welding skirt is arranged on the cross beam, a welding flange five and a welding plate are arranged on one side of the safety belt fixing groove box, the connecting strength of each component is increased, and the rigidity of the structure is increased.

[0021] 5. The structure is provided with an angle-shaped rib, a circular rib and a reinforcing rib, which increases the strength of the component itself, guides the force transmission path, disperses the stress, avoids load concentration, avoids plastic deformation or even tearing and damage of the component, and improves the strength of the seat and safety belt assembly and the safety of passengers. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The figure is a schematic diagram of the structure of the structure disclosed in the application;

[0023] Figure 2 The figure is a schematic diagram of the structure of the structure disclosed in the application;

[0024] Figure 3 The figure is a schematic diagram of the structure of the structure disclosed in the application; Figure 2 The figure is a schematic diagram of the structure of the structure disclosed in the application;

[0025] Figure 4 The figure is a schematic diagram of the structure of the structure disclosed in the application; Figure 2 The figure is a schematic diagram of the structure of the structure disclosed in the application;

[0026] Figure 5 The figure is a schematic diagram of the structure of the structure disclosed in the application;

[0027] Figure 6 The figure is a schematic diagram of the structure of the structure disclosed in the application;

[0028] Figure 7 The figure is a schematic diagram of the structure of the structure disclosed in the application;

[0029] Figure 8 The right longitudinal beam structure diagram of the disclosed structure of the present application;

[0030] Figure 9 The back structure diagram of the disclosed structure of the present application.

[0031] Wherein: 1, seat fixed groove box; 101, welding duckbill one; 102, groove one; 103, angle-shaped rib; 104, round rib; 105, groove two; 106, reinforcing rib one; 107, welding flange one; 108, welding flange two; 109, welding nut one; 110, round hole one; 2, cross beam; 201, cross beam welding enhanced pressure groove; 202, cross beam reinforcing rib; 203, cross beam boss; 204, cross beam bottom groove plate; 205, cross beam welding skirt; 206, cross beam flange; 3, safety belt fixed groove box one; 301, welding duckbill two; 302, welding flange three; 303, welding flange four; 304, flange one; 305, welding nut two; 4, right longitudinal beam; 401, welding flange five; 402, longitudinal beam flange one; 403, round rib two; 404, bottom flat plate; 405, concave plate; 406, welding plate; 407, longitudinal beam flange two; 5, left longitudinal beam; 6, safety belt fixed groove box two; 7, vehicle body bottom plate; 8, safety belt fixer; 9, seat leg. DETAILED DESCRIPTION

[0032] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0033] As Figures 1-9 shown, a second-row seat fixing structure of a commercial vehicle includes a vehicle body bottom plate 7, the front side of the vehicle body bottom plate 7 is provided with a safety belt fixer 8 and a seat leg 9, the back side of the vehicle body bottom plate 7 is fixed with a cross beam 2 by welding, the safety belt fixer 8 and the seat leg 9 are fixed between the cross beam 2 and the vehicle body bottom plate 7, the seat fixed groove box 1 is fixed between the cross beam 2 and the vehicle body bottom plate 7, the seat fixed groove box 1 is welded on the cross beam 2, the seat fixed groove box 1 is located below the seat leg 9, the bottom of the cross beam 2 is fixed with a right longitudinal beam 4 and a left longitudinal beam 5 by welding, one end of the right longitudinal beam 4 and the left longitudinal beam 5 is fixed and welded on the back side of the cross beam 2, the other end of the right longitudinal beam 4 and the left longitudinal beam 5 is fixed and welded on the back side of the vehicle body bottom plate 7, the inside of the right longitudinal beam 4 is fixed with a safety belt fixed groove box one 3 by welding, the inside of the left longitudinal beam 5 is fixed with a safety belt fixed groove box two 6 by welding, the safety belt fixed groove box one 3 and the safety belt fixed groove box two 6 are respectively located below the safety belt fixer 8, the safety belt fixer 8 of the safety belt on both sides of the second-row seat of the commercial vehicle is adjacent, therefore the right longitudinal beam 4 and the left longitudinal beam 5, the safety belt fixed groove box one 3 and the safety belt fixed groove box two 6 can be adjusted in number according to the situation.

[0034] As shown in Figure 6 , the beam 2 is provided with a beam bottom groove plate 204 in the middle, and the beam welding skirt 205 is provided on both sides of the beam bottom groove plate 204 through the beam folding edge 206, and the whole beam 2 presents a groove structure, which not only guarantees the setting space of the seat fixed groove box 1, but also increases the structural strength of the beam 2.

[0035] As shown in Figure 2 and Figure 5 , the seat fixed groove box 1 is provided with a welding duckbill 101 in the upper part, the welding duckbill 101 is provided with a groove 102 in the middle, the top surface of the beam welding skirt 205 is provided with a beam welding reinforcing groove 201, the beam welding reinforcing groove 201 is welded with the welding duckbill 101, the beam reinforcing rib 202 is arranged between the two beam welding reinforcing grooves 201, the beam reinforcing rib 202 is welded with the groove 102, the welding area is increased, that is, the structural strength is increased, the beam reinforcing rib 202 is arranged at the welding position, that is, the structural strength is increased, and the stress direction is adjusted; the seat fixed groove box 1 is provided with a groove 105 in the middle of the lower part, the groove 105 and the corner of the lower part of the seat fixed groove box 1 are respectively provided with an angle rib 103, the angle rib 103 and the reinforcing rib 106 are arranged between the angle rib 103, the bottom of the angle rib 103 and the reinforcing rib 106 is provided with a welding flange 107, the upper part of the welding flange 107 is provided with a vertical welding flange 108, the welding flange 107 is welded with the beam bottom groove plate 204, and the welding flange 108 is welded with the beam folding edge 206, the welding surfaces of the two places are perpendicular to each other, the stability of welding is increased, the angle rib 103 and the reinforcing rib 106 are arranged on the side surface of the seat fixed groove box 1, part of the Z-direction shear force is converted into horizontal tensile stress, the structural strength in the Z-direction is increased, and the rigidity of the structure is improved.

[0036] A plurality of circular ribs 104 are arranged on the welding flange 107, the circular rib 104 is arranged below the corner below the groove 105 and the lower part of the seat fixed groove box 1, the circular rib 104 is arranged at the position where the Z-direction shear force is converted, that is, the load of the structure is concentrated, and the stability of welding between parts and the rigidity of the structure are effectively increased.

[0037] As shown in Figure 2 and Figure 8As shown, the upper part of the right longitudinal beam 4 is provided with a welding plate 406, the lower part of the right longitudinal beam 4 is provided with a bottom flat plate 404, the bottom flat plate 404 is provided with a circular rib two 403, the strength of the bottom flat plate 404 is increased through the circular rib two 403, the side of the bottom flat plate 404 is provided with a longitudinal beam folding edge one 402, the upper edge of the bottom flat plate 404 is provided with a longitudinal beam folding edge two 407, the upper part of the longitudinal beam folding edge one 402 and the longitudinal beam folding edge two 407 is provided with a welding flange five 401, the welding plate 406 is welded with the back of the cross beam bottom groove plate 204, the longitudinal beam folding edge two 407 is welded with the back of the cross beam folding edge 206, the welding flange five 401 is welded with the car body bottom plate 7, the right longitudinal beam 4 is welded on three sides, and is stably welded with the cross beam 2 and the car body bottom plate 7, the left longitudinal beam 5 and the right longitudinal beam 4 are the same in structure.

[0038] The welding plate 406 is provided with a concave plate 405, the cross beam welding skirt 205 is provided with a cross beam boss 203, the concave plate 405 and the cross beam boss 203 are matched and welded, the welding area is increased, and the concave-convex structure increases the strength of the structure horizontally reversed.

[0039] As shown in Figure 2 and Figure 7 , the safety belt fixing groove box one 3 is provided with a welding duckbill two 301 on the left and right sides respectively, the welding duckbill two 301 is welded with the welding flange five 401; the safety belt fixing groove box one 3 is provided with a folding edge one 304 on the upper and lower sides respectively, the outer side of the folding edge one 304 is provided with a welding flange four 303, the left and right sides of the folding edge one 304 are respectively provided with a welding flange three 302, the welding flange four 303 is welded with the bottom flat plate 404, the welding flange three 302 is welded with the longitudinal beam folding edge one 402, the safety belt fixing groove box one 3 as a whole presents a groove type, and is fixed in the right longitudinal beam 4 in a three-sided welding manner, converts part of the Z-directional shear force into horizontal tensile stress, increases the Z-directional strength of the structure, improves the rigidity of the structure, the safety belt fixing groove box two 6 and the safety belt fixing groove box one 3 are the same in structure.

[0040] As shown in Figure 1 , Figure 2 , Figure 5 and Figure 7 , the seat fixing groove box 1 is provided with a circular hole one 110 on the top surface, the seat fixing groove box 1 is fixedly provided with a welding nut one 109 on the back surface, the circular hole one 110 and the welding nut one 109 are coaxial, the seat leg 9 and the seat fixing groove box 1 are bolted on both sides of the car body bottom plate 7.

[0041] The safety belt fixing groove box one 3 is fixedly provided with a welding nut two 305 on the top surface, the safety belt fixing device 8 and the safety belt fixing groove box one 3 are bolted on both sides of the car body bottom plate 7.

[0042] It should be noted that the number of seat belt anchors 8 can be designed according to the actual scene requirements, and the number of the right longitudinal beam 4, the left longitudinal beam 5, the seat belt fixing slot box 1 3 and the seat belt fixing slot box 2 can be adjusted accordingly. Therefore, the structure can also be used to reinforce other seat positions in commercial vehicles.

[0043] like Figures 1-4 As shown, the body floor 7, seat fixing groove box 1 and cross beam 2 are welded in sequence from top to bottom in section AA; the body floor 7, seat belt fixing groove box 2 6 and left longitudinal beam 5 are welded in sequence from top to bottom on the left side of section BB, and the body floor 7, cross beam and left longitudinal beam 5 are welded in sequence from top to bottom on the right side of section BB, forming a three-layer welded structure to enhance the connection strength of the three.

[0044] The invention discloses a structural design method.

[0045] 1. The main body is made of a trough box structure, and the components are matched to form a closed cavity to improve local rigidity.

[0046] 2. Folding edges are provided on the seat fixing slot box 1, the seat belt fixing slot box 1 3 and the seat belt fixing slot box 2 6 to increase the welding area and increase the overall strength of the structure.

[0047] 3. Angle bars 103, circular bars 104, reinforcement bars 106 and beam reinforcement bars 202 are set at the load concentration positions of the components to increase the strength of the components themselves and artificially disperse the stress.

[0048] 4. The welding surfaces of each component in the structure are connected in sequence to form a three-layer welded structure.

[0049] 5. The distance between the weld nut and the inner fold of the structure, the reinforcement and the three-layer welding surface is very close.

[0050] In the description of the present invention, the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "vertical", "horizontal", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are intended only to describe the present invention and do not require that the present invention must be constructed or operated in a specific direction. Therefore, they should not be understood as limitations on the present invention. The terms "connected" and "connected" in the present invention should be understood in a broad sense. For example, they can be connected or detachably connected; they can be directly connected or indirectly connected through an intermediate component. For those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0051] The above is a preferred operating mode of the present invention. The description of the specific operating mode is only for a better understanding of the concept of the present invention. For those skilled in the art, it is clear that several improvements or equivalent substitutions can be made according to the principles of the present invention, and these improvements or equivalent substitutions are also considered to fall within the scope of protection of the present invention.

Claims

1. A second row seat fixing structure for a commercial vehicle, characterized in that: The invention comprises a vehicle body bottom plate (7), wherein a safety belt anchor (8) and a seat leg (9) are arranged on the front of the vehicle body bottom plate (7), a crossbeam (2) is fixedly arranged on the back of the vehicle body bottom plate (7), a seat fixing slot box (1) is fixedly arranged between the crossbeam (2) and the vehicle body bottom plate (7), and the seat fixing slot box (1) is located below the seat leg (9), a right longitudinal beam (4) and a left longitudinal beam (5) are fixedly arranged on the bottom of the crossbeam (2), one end of the right longitudinal beam (4) and the left longitudinal beam (5) are fixed to the back of the crossbeam (2), and the other end of the right longitudinal beam (4) and the left longitudinal beam (5) are fixed to the back of the vehicle body bottom plate (7), a safety belt fixing slot box 1 (3) is fixedly arranged inside the right longitudinal beam (4), and a safety belt fixing slot box 2 (6) is fixedly arranged inside the left longitudinal beam (5), and the safety belt fixing slot box 1 (3) and the safety belt fixing slot box 2 (6) are respectively located below the safety belt anchor (8); The seat fixing slot box (1) is provided with a welding duck tongue (101) on the upper part, a groove (102) is provided in the middle of the welding duck tongue (101), a beam bottom slot plate (204) is provided in the middle of the beam (2), beam welding skirts (205) are provided on both sides of the beam bottom slot plate (204) through beam folding edges (206), a beam welding reinforcement groove (201) is provided on the top surface of the beam welding skirt (205), the beam welding reinforcement groove (201) is correspondingly welded to the welding duck tongue (101), a beam reinforcement rib (202) is provided between the two beam welding reinforcement grooves (201), and the beam reinforcement rib (202) is provided with the groove (102). (102) corresponding welding; a groove 2 (105) is provided in the middle of the lower part of the seat fixing groove box (1), and angle ribs (103) are provided at the corners of the groove 2 (105) and the lower part of the seat fixing groove box (1), and a reinforcing rib (106) is provided between the angle ribs (103), and a welding flange 1 (107) is provided at the bottom of the angle rib (103) and the reinforcing rib 1 (106), and a vertical welding flange 2 (108) is provided on the upper part of the welding flange 1 (107), and the welding flange 1 (107) is welded to the bottom groove plate (204) of the crossbeam, and the welding flange 2 (108) is welded to the crossbeam folding edge (206), and the two welding surfaces are perpendicular to each other.

2. A second-row seat fixing structure for a commercial vehicle according to claim 1, characterized in that: A plurality of groups of circular ribs (104) are provided on the welding flange 1 (107), and the circular ribs (104) are located below the corner of the groove 2 (105) and the lower part of the seat fixing groove box (1).

3. The second row seat fixing structure for a commercial vehicle according to claim 1, characterized in that: A welding plate (406) is provided on the upper portion of the right longitudinal beam (4), a bottom flat plate (404) is provided on the lower portion of the right longitudinal beam (4), a circular rib (403) is provided on the bottom flat plate (404), a longitudinal beam folding edge (402) is provided on the side of the bottom flat plate (404), a longitudinal beam folding edge (407) is provided on the upper portion of the bottom flat plate (404), a welding flange (401) is provided above the longitudinal beam folding edge (402) and the longitudinal beam folding edge (407), the welding plate (406) is welded to the back side of the cross beam bottom groove plate (204), the longitudinal beam folding edge (407) is welded to the back side of the cross beam folding edge (206), and the welding flange (401) is welded to the vehicle body bottom plate (7).

4. A second-row seat fixing structure for a commercial vehicle according to claim 3, characterized in that: A concave plate (405) is provided on the welding plate (406), a crossbeam boss (203) is provided on the crossbeam welding skirt (205), and the concave plate (405) and the crossbeam boss (203) are welded together.

5. The second row seat fixing structure for a commercial vehicle according to claim 3, characterized in that: The left and right sides of the safety belt fixing slot box 1 (3) are respectively provided with welding duck tongue 2 (301), and the welding duck tongue 2 (301) is welded to the welding flange 5 (401).

6. The second row seat fixing structure for a commercial vehicle according to claim 3, characterized in that: The safety belt fixing slot box (3) is provided with a folding edge (304) on the upper and lower sides respectively, a welding flange (303) is provided on the outer side of the folding edge (304), and a welding flange (302) is provided on the left and right sides respectively. The welding flange (303) is welded to the bottom flat plate (404), and the welding flange (302) is welded to the longitudinal beam folding edge (402).

7. The second row seat fixing structure for a commercial vehicle according to claim 5, characterized in that: A circular hole (110) is provided on the top surface of the seat fixing slot box (1), and a welding nut (109) is fixedly provided on the back surface of the seat fixing slot box (1). The circular hole (110) and the welding nut (109) are coaxial, and the seat leg (9) and the seat fixing slot box (1) are fixed on both sides of the vehicle body bottom plate (7) by bolts.

8. The second row seat fixing structure for a commercial vehicle according to claim 5, characterized in that: A welding nut 2 (305) is fixedly provided on the top surface of the first safety belt fixing slot box (3), and the first safety belt fixing slot box (8) and the first safety belt fixing slot box (3) are fixed on both sides of the vehicle body bottom plate (7) by bolts.

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