Fixing structure for second row of seats of commercial vehicle

Abstract

The invention discloses a commercial vehicle second-row seat fixing structure which comprises a vehicle body bottom plate, a safety belt fixator and seat legs arranged on the front face of the vehicle body bottom plate, a cross beam fixed to the back side of the vehicle body bottom plate, a seat fixing groove box fixed between the cross beam and the vehicle body bottom plate, and a right longitudinal beam and a left longitudinal beam fixed to the bottom of the cross beam. One end of the right longitudinal beam and one end of the left longitudinal beam are fixed on the back of the cross beam, the other end of the right longitudinal beam and the other end of the left longitudinal beam are fixed on the back of the vehicle body bottom plate, a first safety belt fixing groove box is fixed inside the right longitudinal beam, and a second safety belt fixing groove box is fixed inside the left longitudinal beam. The structure disclosed by the invention adopts a groove box structure, so that the stress area of fixed point positions of the seat and the safety belt is increased, and the phenomenon of stress concentration is avoided, so that the seat and the safety belt are separated and fixed, and personal injury is avoided; part of Z-direction shearing force is converted into tensile stress in the horizontal direction, concentrated loads are reduced, plastic deformation and even tearing damage of components are avoided, and the strength of the seat and safety belt assembly and the safety of passengers are improved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile accessories, and in particular to a second-row seat fixing structure for a commercial vehicle. Background Art

[0002] During the design and development of the lower body, many factors must be considered comprehensively. As a national mandatory standard, the importance of the seat belt fixing strength is self-evident and should be the core focus of the design. However, most designers currently rely mainly on personal experience to carry out design work, and lack effective verification methods to ensure the feasibility of the design in the early stages of the project. The seat and seat belt assembly is a key component of the occupant restraint system. It closely connects the occupant with the body, and its performance directly affects the comfort and passive safety of the entire vehicle. When a car collides or rolls over, if the seat belt assembly cannot firmly restrain the occupant in the car on the seat, or the surrounding area of ​​the seat belt and seat fixing point is torn or broken, the seat will be out of the fixing point, which may cause a secondary collision between the occupant and other parts in the car, causing injury to the occupant in the car. Accident statistics show that a large part of occupant injuries are caused by secondary collisions between occupants and other parts in the car. Therefore, the passive safety performance of car seats is increasingly valued by people.

[0003] Seats are usually fixed to the vehicle body floor with bolts. In order for the seats to effectively protect the occupants in a collision, the fixing points of the seats, related safety devices and the vehicle body must not fail. Therefore, it is necessary to optimize the design of the vehicle body structure strength under the seat pulling safety condition. Summary of the invention

[0004] The purpose of the present invention is to solve the problems raised in the above-mentioned background technology, and then proposes a second-row seat fixing structure for a commercial vehicle. The components of the structural arrangement disclosed by the present invention adopt a groove box structure, which increases the force-bearing area of ​​the seat and the seat belt fixing points, avoids the stress concentration phenomenon, causes the seat and the seat belt to be separated from the fixation, and causes personal injury; through the groove box structure of the component, part of the Z-direction shear force is converted into horizontal tensile stress, reducing the Z-direction shear force, thereby reducing concentrated loads, avoiding plastic deformation or even tearing damage of the component, and improving the strength of the seat and seat belt assembly and the safety of passengers.

[0005] The technical solution adopted by the present invention to solve the technical problem is:

[0006] A second-row seat fixing structure for a commercial vehicle comprises a vehicle body floor, a seat belt anchor and a seat leg are arranged at the front of the vehicle body floor, a cross beam is fixedly arranged at the back side of the vehicle body floor, a seat fixing slot box is fixedly arranged between the cross beam and the vehicle body floor, the seat fixing slot box is welded to the cross beam, the seat fixing slot box is located below the seat leg, a right longitudinal beam and a left longitudinal beam are fixedly arranged at the bottom of the cross beam, one end of the right longitudinal beam and the left longitudinal beam are fixedly welded to the back side of the cross beam, and the other ends of the right longitudinal beam and the left longitudinal beam are fixedly welded to the back side of the vehicle body floor, a seat belt fixing slot box 1 is fixedly arranged inside the right longitudinal beam, a seat belt fixing slot box 2 is fixedly arranged inside the left longitudinal beam, the seat belt fixing slot box 1 and the seat belt fixing slot box 2 are respectively located below the seat belt anchors, and the seat belt anchors of the seat belts on both sides of the second-row seat of the commercial vehicle are adjacent, so the number of the right longitudinal beam and the left longitudinal beam, the seat belt fixing slot box 1 and the seat belt fixing slot box 2 can be adjusted according to the situation.

[0007] Preferably, a crossbeam bottom groove plate is arranged in the middle of the crossbeam, and crossbeam welding skirts are arranged on both sides of the crossbeam bottom groove plate through the crossbeam folding edges. The crossbeam as a whole presents a groove structure, which not only ensures the setting space of the seat fixing groove box, but also increases the structural strength of the crossbeam.

[0008] Preferably, a welding duck tongue 1 is provided on the upper part of the seat fixing groove box, a groove 1 is provided in the middle of the welding duck tongue 1, a beam welding reinforcement groove is provided on the top surface of the beam welding skirt, the beam welding reinforcement groove is welded correspondingly to the welding duck tongue 1, a beam reinforcement rib is provided between the two beam welding reinforcement grooves, the beam reinforcement rib is welded correspondingly to the groove 1, the welding area is increased, that is, the structural strength is increased, and the reinforcement rib is provided at the welding point, that is, the structural strength is increased and the force direction is adjusted; a groove 2 is provided in the middle of the lower part of the seat fixing groove box, the Angular ribs are respectively arranged at the corners of groove 2 and the lower part of the seat fixing groove box, and reinforcing ribs 1 are arranged between the angular ribs. A welding flange 1 is arranged at the bottom of the angular ribs and the reinforcing rib 1, and a vertical welding flange 2 is arranged on the upper part of the welding flange 1. The welding flange 1 is welded to the bottom groove plate of the beam, and the welding flange 2 is welded to the folded edge of the beam. The two welding surfaces are perpendicular to each other, which increases the stability of the welding. Angular ribs and reinforcing rib 1 are arranged on the side of the seat fixing groove box to convert part of the Z-direction shear force into horizontal tensile stress, increase the Z-direction strength of the structure, and improve the rigidity of the structure.

[0009] Preferably, a plurality of groups of circular ribs are provided on the welding flange 1, and the circular ribs are located below the corner of the groove 2 and the lower part of the seat fixing groove box. The circular ribs are arranged at the position where the Z-direction shear force is converted, that is, the load of the structure is concentrated, which effectively increases the stability of the welding between the components and the rigidity of the structure.

[0010] Preferably, a welding plate is provided on the upper part of the right longitudinal beam, a bottom flat plate is provided on the lower part of the right longitudinal beam, and two circular ribs are provided on the bottom flat plate to increase the strength of the bottom flat plate, a longitudinal beam folded edge one is provided on the side of the bottom flat plate, a longitudinal beam folded edge two is provided on the top of the bottom flat plate, a welding flange five is provided above the longitudinal beam folded edge one and the longitudinal beam folded edge two, the welding plate is welded to the back side of the cross beam bottom groove plate, the longitudinal beam folded edge two is welded to the back side of the cross beam folded edge, the welding flange five is welded to the bottom plate of the vehicle body, the right longitudinal beam is welded on three sides, and is firmly welded to the cross beam and the bottom plate of the vehicle body, and the left and right longitudinal beams have the same structure.

[0011] Preferably, a concave plate is provided on the welding plate, and a beam boss is provided on the beam welding skirt. The concave plate and the beam boss are welded together to increase the welding area. At the same time, the concave-convex structure increases the horizontal reverse strength of the structure.

[0012] Preferably, a welding duck tongue 2 is provided on the left and right sides of the safety belt fixing slot box 1, respectively, and the welding duck tongue 2 is welded to the welding flange 5.

[0013] Preferably, a seat belt fixing groove box is provided with a folded edge 1 on the upper and lower sides respectively, a welding flange 4 is provided on the outer side of the folded edge 1, and welding flanges 3 are provided on the left and right sides of the folded edge 1 respectively, the welding flange 4 is welded to the bottom flat plate, and the welding flange 3 is welded to the folded edge 1 of the longitudinal beam. The seat belt fixing groove box 1 is groove-shaped as a whole, and is also fixed inside the right longitudinal beam by three-sided welding, which converts part of the Z-direction shear force into horizontal tensile stress, increases the Z-direction strength of the structure, and improves the rigidity of the structure. The structure of the seat belt fixing groove box 2 is the same as that of the seat belt fixing groove box 1.

[0014] Preferably, a circular hole is set on the top surface of the seat fixing groove box, and a welding nut is fixedly set on the back side of the seat fixing groove box. The circular hole and the welding nut are coaxial, and the seat legs and the seat fixing groove box are fixed on both sides of the vehicle body floor by bolts.

[0015] Preferably, a welding nut 2 is fixedly provided on the top surface of the seat belt fixing groove box 1, and the seat belt anchor and the seat belt fixing groove box 1 are fixed on both sides of the vehicle body bottom plate by bolts.

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

[0017] 1. The components of the structural arrangement disclosed in the present invention adopt a groove box structure, which increases the force-bearing area of ​​the seat and the safety belt fixing points, avoids the stress concentration phenomenon, causes the seat and the safety belt to be separated from the fixing, and causes personal injury; through the groove box structure of the component, part of the Z-direction shear force is converted into horizontal tensile stress, reducing the Z-direction shear force, thereby reducing concentrated loads, avoiding plastic deformation or even tearing damage of the component, and improving the strength of the seat and safety belt assembly and the safety of passengers.

[0018] 2. The structure disclosed in the present invention is provided with grooves and reinforcing ribs at the welding points, thereby increasing the welding area, and at the same time the concave-convex structure increases the horizontal reverse strength of the structure; the welding surfaces between the two components are perpendicular to each other, thereby increasing the stability of the welding; the welding surfaces in the structure are connected in sequence to form a three-layer welded structure, and then the seat legs are fixed by welding nuts 1 and bolts, and the seat belt fasteners are fixed by welding nuts 2 and bolts, thereby reducing the area under force, avoiding stress concentration, and improving the rigidity of the structure.

[0019] 3. A crossbeam fold is provided on the crossbeam of the structure disclosed in the present invention, a fold is provided on one side of the seat belt fixing slot box, a longitudinal beam fold 1 and a longitudinal beam fold 2 are provided on the right longitudinal beam, and a force transmission path is artificially provided to enhance the strength in the Z direction and improve the rigidity of the component.

[0020] 4. The seat fixing groove box of the structure disclosed in the present invention is provided with a welding duck tongue 1, a welding flange 1 and a welding flange 2, a crossbeam welding skirt is provided on the crossbeam, and a welding flange 5 and a welding plate are provided on one side of the seat belt fixing groove box, which increases the connection strength of each component, that is, increases the rigidity of the structure.

[0021] 5. The angular ribs, circular ribs and reinforcing ribs arranged in the structure disclosed by the present invention, on the one hand, increase the strength of the component itself, and on the other hand, guide the force transmission path, disperse the larger stress, avoid load concentration, avoid plastic deformation or even tearing damage of the components, and improve the strength of the seat and safety belt assembly and the safety of the passengers. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the installation structure of the disclosed structure of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the structure disclosed in the present invention;

[0024] Figure 3 The present invention discloses a structure Figure 2 Upper AA section cutaway view;

[0025] Figure 4 The present invention discloses a structure Figure 2 Upper BB section cutaway view;

[0026] Figure 5 It is a schematic diagram of the seat fixing slot box structure disclosed in the present invention;

[0027] Figure 6 It is a schematic diagram of the crossbeam structure of the structure disclosed in the present invention;

[0028] Figure 7 It is a structural schematic diagram of a safety belt fixing slot box of the structure disclosed in the present invention;

[0029] Figure 8 It is a schematic diagram of the right longitudinal beam structure of the structure disclosed in the present invention;

[0030] Fig. 9 The figure is a schematic diagram of the back structure of the vehicle body bottom plate of the structure disclosed in the present invention.

[0031] Among them: 1. Seat fixing slot box; 101. Welded duck tongue 1; 102. Groove 1; 103. Angular rib; 104. Circular rib; 105. Groove 2; 106. Reinforcement rib 1; 107. Welded flange 1; 108. Welded flange 2; 109. Welded nut 1; 110. Round hole 1; 2. Crossbeam; 201. Crossbeam welding reinforced groove; 202. Crossbeam reinforcement rib; 203. Crossbeam boss; 204. Crossbeam bottom slot plate; 205. Crossbeam welding skirt; 206. Crossbeam folding edge ; 3. Seat belt fixing slot box one; 301. Welded duck tongue two; 302. Welded flange three; 303. Welded flange four; 304. Folding edge one; 305. Welding nut two; 4. Right longitudinal beam; 401. Welding flange five; 402. Longitudinal beam folding edge one; 403. Circular rib two; 404. Bottom flat plate; 405. Concave plate; 406. Welded plate; 407. Longitudinal beam folding edge two; 5. Left longitudinal beam; 6. Seat belt fixing slot box two; 7. Body bottom plate; 8. Seat belt anchor; 9. Seat leg. DETAILED DESCRIPTION

[0032] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

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

[0034] like Figure 6 As shown, a beam bottom groove plate 204 is arranged in the middle of the beam 2, and beam welding skirts 205 are arranged on both sides of the beam bottom groove plate 204 through beam folding edges 206 respectively. The beam 2 presents a groove-shaped structure as a whole, which not only ensures the setting space of the seat fixing groove box 1, but also increases the structural strength of the beam 2.

[0035] like Figure 2 and Figure 5 As shown, a welded duck tongue 101 is arranged on the upper part of the seat fixing groove box 1, a groove 102 is arranged in the middle of the welded duck tongue 101, a beam welding reinforcement groove 201 is arranged on the top surface of the beam welding skirt 205, the beam welding reinforcement groove 201 is welded correspondingly to the welded duck tongue 101, a beam reinforcement rib 202 is arranged between the two beam welding reinforcement grooves 201, the beam reinforcement rib 202 is welded correspondingly to the groove 102, the welding area is increased, that is, the structural strength is increased, and the beam reinforcement rib 202 is arranged at the welding point, that is, the structural strength is increased, and the force direction is adjusted; a groove 205 is arranged in the middle of the lower part of the seat fixing groove box 1, and the ... Angular ribs 103 are respectively arranged at the corners of 105 and the lower part of the seat fixing slot box 1, and reinforcing ribs 106 are arranged between the angular ribs 103. A welding flange 107 is arranged at the bottom of the angular ribs 103 and the reinforcing rib 106. A vertical welding flange 108 is arranged on the upper part of the welding flange 107. The welding flange 107 is welded to the bottom slot plate 204 of the cross beam, and the welding flange 108 is welded to the cross beam fold 206. The two welding surfaces are perpendicular to each other to increase the stability of the welding. Angular ribs 103 and reinforcing ribs 106 are arranged on the side of the seat fixing slot box 1 to convert part of the Z-direction shear force into horizontal tensile stress, increase the Z-direction strength of the structure, and improve the rigidity of the structure.

[0036] A plurality of groups of circular ribs 104 are arranged on the welding flange 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. The circular ribs 104 are arranged at the position where the shear force in the Z direction is converted, that is, the load of the structure is concentrated, which effectively increases the stability of the welding between the components and the rigidity of the structure.

[0037] like Figure 2 and Figure 8As shown, a welding plate 406 is arranged on the upper part of the right longitudinal beam 4, a bottom plate 404 is arranged on the lower part of the right longitudinal beam 4, a second circular rib 403 is arranged on the bottom plate 404, and the strength of the bottom plate 404 is increased by the second circular rib 403, a longitudinal beam folding edge 1 402 is arranged on the side of the bottom plate 404, a longitudinal beam folding edge 2 407 is arranged on the upper side of the bottom plate 404, a welding flange 5 401 is arranged above the longitudinal beam folding edge 1 402 and the longitudinal beam folding edge 2 407, the welding plate 406 is welded to the back side of the cross beam bottom groove plate 204, the longitudinal beam folding edge 2 407 is welded to the back side of the cross beam folding edge 206, the welding flange 5 401 is welded to the vehicle body bottom plate 7, the right longitudinal beam 4 is welded on three sides, and is firmly welded to the cross beam 2 and the vehicle body bottom plate 7, and the left longitudinal beam 5 and the right longitudinal beam 4 have the same structure;

[0038] A concave plate 405 is arranged on the welding plate 406, and a beam boss 203 is arranged on the beam welding skirt 205. The concave plate 405 and the beam boss 203 are welded together to increase the welding area. Meanwhile, the concave-convex structure increases the strength of the structure in the horizontal reverse direction.

[0039] like Figure 2 and Figure 7 As shown, welding duck tongues 2 301 are respectively arranged on the left and right sides of the seat belt fixing slot box 1 3, and the welding duck tongues 2 301 are welded to welding flanges 5 401; folding edges 1 304 are respectively arranged on the upper and lower sides of the seat belt fixing slot box 1 3, welding flanges 4 303 are arranged on the outer side of the folding edge 1 304, welding flanges 3 302 are respectively arranged on the left and right sides of the folding edge 1 304, the welding flanges 4 303 are welded to the bottom flat plate 404, and the welding flanges 302 are welded to the longitudinal beam folding edge 1 402. The seat belt fixing slot box 1 3 is groove-shaped as a whole, and is also fixed inside the right longitudinal beam 4 by three-sided welding, which converts part of the Z-direction shear force into horizontal tensile stress, increases the Z-direction strength of the structure, and improves the rigidity of the structure. The seat belt fixing slot box 2 6 has the same structure as the seat belt fixing slot box 1 3.

[0040] like Figure 1 , Figure 2 , Figure 5 and Figure 7 As shown, 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;

[0041] A welding nut 2 305 is fixedly arranged on the top surface of the seat belt fixing groove box 1 3 , and the seat belt anchor 8 and the seat belt fixing groove box 1 3 are fixed on both sides of the vehicle body bottom plate 7 by bolts.

[0042] It should be noted that the structure disclosed in the present invention is 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 groove box 1 3 and the seat belt fixing groove box 2 can be adjusted accordingly. Therefore, the structure can also be applied to the reinforcement of other seat positions in commercial vehicles.

[0043] like Figure 1-Figure 4 As shown, the body floor 7, the seat fixing groove box 1 and the cross beam 2 of the AA section are welded in sequence from top to bottom; the body floor 7, the seat belt fixing groove box 2 6 and the left longitudinal beam 5 of the left side of the BB section are welded in sequence from top to bottom, and the body floor 7, the cross beam and the left longitudinal beam 5 of the right side of the BB section are welded in sequence from top to bottom, 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. The seat fixing slot box 1, the seat belt fixing slot box 1 3 and the seat belt fixing slot box 2 6 are provided with folded edges to increase the welding area and the overall strength of the structure.

[0047] 3. Angle ribs 103, circular ribs 104, reinforcing ribs 106 and beam reinforcing ribs 202 are arranged at the load concentration positions of the components to increase the strength of the components themselves and to 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 folded edge, reinforcement rib and three-layer welding surface of the structure is very close.

[0050] In the description of the present invention, the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "vertical", "horizontal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the purpose of describing the present invention rather than requiring the present invention to be constructed or operated in a specific position, and therefore should not be construed as limiting the present invention. The terms "connected" and "connected" in the present invention should be understood in a broad sense, for example, it can be a connection or a detachable connection; it can be a direct connection or an indirect connection through an intermediate component. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0051] The above is the preferred operation mode of the present invention, and the description of the specific operation mode is only used to better understand the concept of the present invention. For ordinary technicians in this technical field, 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 protection scope 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 fixing device (8) and a seat leg (9) are arranged on the front of the vehicle body bottom plate (7), a cross beam (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 cross beam (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 at the bottom of the cross beam (2), one end of the right longitudinal beam (4) and the left longitudinal beam (5) are fixed to the back of the cross beam (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 first safety belt fixing slot box (3) is fixedly arranged inside the right longitudinal beam (4), and a second safety belt fixing slot box (6) is fixedly arranged inside the left longitudinal beam (5), and the first safety belt fixing slot box (3) and the second safety belt fixing slot box (6) are respectively located below the safety belt fixing device (8).

2. A second row seat fixing structure for a commercial vehicle according to claim 1, characterized in that: A crossbeam bottom groove plate (204) is arranged in the middle of the crossbeam (2), and crossbeam welding skirt edges (205) are respectively arranged on both sides of the crossbeam bottom groove plate (204) through crossbeam folding edges (206).

3. A second row seat fixing structure for a commercial vehicle according to claim 2, characterized in that: The seat fixing slot box (1) is provided with a welded duck tongue (101) on the upper part, a groove (102) is provided in the middle of the welded duck tongue (101), 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 welded to the welded duck tongue (101) correspondingly, a beam reinforcement rib (202) is provided between the two beam welding reinforcement grooves (201), the beam reinforcement rib (202) is welded to the groove (102) correspondingly; the seat fixing slot box (1) is provided with a welded duck tongue (101) on the lower part in the middle. Groove 2 (105), angle ribs (103) are respectively arranged at the corners of the groove 2 (105) and the lower part of the seat fixing groove box (1), reinforcing ribs (106) are arranged between the angle ribs (103), welding flange 1 (107) is arranged at the bottom of the angle rib (103) and reinforcing rib 1 (106), vertical welding flange 2 (108) is arranged on the upper part of the welding flange 1 (107), the welding flange 1 (107) is welded to the bottom groove plate (204) of the cross beam, and the welding flange 2 (108) is welded to the folded edge (206) of the cross beam.

4. A second row seat fixing structure for a commercial vehicle according to claim 3, characterized in that: A plurality of groups of circular ribs (104) are arranged 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).

5. The second row seat fixing structure of a commercial vehicle according to claim 3, characterized in that: A welding plate (406) is arranged on the upper part of the right longitudinal beam (4), a bottom plate (404) is arranged on the lower part of the right longitudinal beam (4), a circular rib 2 (403) is arranged on the bottom plate (404), a longitudinal beam folding edge 1 (402) is arranged on the side of the bottom plate (404), a longitudinal beam folding edge 2 (407) is arranged on the upper side of the bottom plate (404), a welding flange 5 (401) is arranged above the longitudinal beam folding edge 1 (402) and the longitudinal beam folding edge 2 (407), the welding plate (406) is welded to the back side of the cross beam bottom groove plate (204), the longitudinal beam folding edge 2 (407) is welded to the back side of the cross beam folding edge (206), and the welding flange 5 (401) is welded to the vehicle body bottom plate (7).

6. A second row seat fixing structure for a commercial vehicle according to claim 5, characterized in that: A concave plate (405) is arranged on the welding plate (406), a crossbeam boss (203) is arranged on the crossbeam welding skirt (205), and the concave plate (405) and the crossbeam boss (203) are welded together.

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

8. A second row seat fixing structure for a commercial vehicle according to claim 5, characterized in that: The safety belt fixing slot box one (3) is provided with a folded edge one (304) on the upper and lower sides respectively, a welded flange four (303) is provided on the outer side of the folded edge one (304), and a welded flange three (302) is provided on the left and right sides of the folded edge one (304), the welded flange four (303) is welded to the bottom plate (404), and the welded flange three (302) is welded to the longitudinal beam folded edge one (402).

9. A second row seat fixing structure for a commercial vehicle according to claim 7, characterized in that: A circular hole (110) is arranged on the top surface of the seat fixing slot box (1), a welding nut (109) is fixedly arranged 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.

10. A second row seat fixing structure for a commercial vehicle according to claim 7, characterized in that: A welding nut 2 (305) is fixedly arranged on the top surface of the seat belt fixing slot box 1 (3), and the seat belt anchor (8) and the seat belt fixing slot box 1 (3) are fixed on both sides of the vehicle body bottom plate (7) by bolts.

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