Packaging box for front floor and seat installation cross beam

Abstract

The utility model discloses a packaging box for a front floor and a seat installation cross beam in the technical field of packaging boxes, and aims to solve the problems that in the prior art, the front floor and the front seat installation cross beam are easy to damage during assembly, storage and transportation, the utilization rate of packaging space is low, and subsequent assembly is affected due to mismatching of models and numbers during independent storage and transportation. And storage and transportation resources are wasted due to independent packaging and transportation of the rear seat mounting cross beam. The packaging box comprises at least two packaging box bodies which are distributed in the longitudinal direction, and the top faces of the packaging box bodies are sunken inwards to form a front floor containing groove for containing a front floor and a front cross beam containing groove for containing a front seat installation cross beam. The front floor placing groove is matched with the bottom surface structure of the front floor, and the front cross beam placing groove is matched with the bottom surface structure of the front seat mounting cross beam.

Description

Technical Field

[0001] The utility model relates to a packing box for a front floor and a seat installation cross beam, belonging to the technical field of packing boxes. Background Art

[0002] Today, with the rapid and refined development of the automotive industry division of labor, automotive parts are usually manufactured by automotive parts manufacturers scattered in different regions according to design drawings, and then transported to the general assembly department of the vehicle enterprise for unified assembly. In the process of the factory production, storage, transportation and assembly of automotive parts, scientifically selecting the packing boxes for automotive parts is beneficial to minimizing transportation losses, reducing transportation costs and improving transportation efficiency to the greatest extent.

[0003] The front floor is the bottom surface structure of the front cockpit of the vehicle, which consists of a left front floor and a front floor arranged on both sides of the console. The main body of the front floor is a planar structure, with an arc-shaped upturned pedal at its front end, and the front seat installation cross beam can be assembled on the top surface, and the front row seats are installed through the front seat installation cross beam. When the front floor and the front seat installation cross beam are assembled and stored and transported, there is a large height difference between the lowest longitudinal beam and the highest mounting seat, so it occupies more packaging space longitudinally, and the longitudinal compression is likely to cause local deformation of the planar front floor main body. Due to the large transverse dimension of the front floor itself, its pedal is not in the same plane as the front floor main body, and it is also likely to be deformed under pressure due to transverse inertial movement during storage and transportation. Some manufacturers also adopt the method of storing and transporting the front floor and the front seat installation cross beam separately. Although the problem of excessive longitudinal dimensions is avoided, subsequent assembly is often affected due to non-matching models and quantities.

[0004] In addition, the second row of seats of the vehicle is installed on the middle floor through the rear seat installation cross beam. Since the middle floor is a wavy inclined plane structure, after assembling the corresponding rear seat installation cross beam, the overall shape is extremely irregular and is very likely to be damaged during storage and transportation. Therefore, currently, the middle floor and the rear seat installation cross beam are usually packaged and transported separately, wasting limited storage and transportation space and loading resources, and subsequent assembly may also be affected due to non-matching models and quantities after arriving at the general assembly plant. Content of the Utility Model

[0005] Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide a packing box for a front floor and a seat installation cross beam, so as to solve the technical problems in the prior art that the front floor and the front seat installation cross beam are easily damaged during assembly, storage and transportation, the utilization rate of the packaging space is low, separate storage and transportation affects subsequent assembly due to non-matching models and quantities, and the independent packaging and transportation of the rear seat installation cross beam wastes storage and transportation resources.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0007] A packing box for a front floor and a seat mounting crossbeam, comprising at least two packing box bodies longitudinally distributed. An inward depression is formed on the top surface of the packing box body to form a front floor placement groove for accommodating the front floor and a front crossbeam placement groove for accommodating the front seat mounting crossbeam;

[0008] The front floor placement groove is adapted to the bottom surface structure of the front floor, and the front crossbeam placement groove is adapted to the bottom surface structure of the front seat mounting crossbeam.

[0009] Preferably, an inward depression is formed on the bottom surface of the packing box body to form a second avoidance groove, and the second avoidance groove is adapted to the pedal of the front floor or / and the front crossbeam mounting seat of the front seat mounting crossbeam.

[0010] Preferably, the front floor accommodated in the front floor placement groove is assembled with the front seat mounting crossbeam, and an inward depression is formed on the side surface of the front floor placement groove to form a first avoidance groove adapted to the end protrusion of the assembled front seat mounting crossbeam;

[0011] The second avoidance groove is also adapted to the front crossbeam mounting seat of the assembled front seat mounting crossbeam.

[0012] Preferably, an inward depression is further formed on the top surface of the packing box body to form a storage groove or / and a rear crossbeam placement groove for accommodating the rear seat mounting crossbeam, and the rear crossbeam placement groove is adapted to the bottom surface structure of the rear seat mounting crossbeam;

[0013] The second avoidance groove is also adapted to the rear crossbeam mounting seat of the rear seat mounting crossbeam.

[0014] Preferably, an inward depression is further formed on the top surface of the packing box body to form a second picking groove communicating with the storage groove.

[0015] Preferably, the rear crossbeam placement groove communicates with the front crossbeam placement groove, and the rear seat mounting crossbeam accommodated in the rear crossbeam placement groove and the front seat mounting crossbeam accommodated in the front crossbeam placement groove are overlapped at a right angle to each other.

[0016] Preferably, a hollow opening is formed by an inward depression on the bottom surface of at least any one of the front floor placement groove, the front crossbeam placement groove, and the rear crossbeam placement groove.

[0017] Preferably, an inward depression is further formed on the bottom surface of the packing box body to form a material reduction groove or / and a lifting groove communicating with the side surface of the packing box body;

[0018] At least any one of between adjacent material reduction grooves, between adjacent second avoidance grooves, and between the material reduction groove and the second avoidance groove forms a strengthening partition plate having the same height as the bottom surface of the packing box body.

[0019] Preferably, a limiting post protrudes outward from the top surface of the packing box body, and the inner edge of the material reduction groove is adapted to the limiting post.

[0020] Preferably, the bottom surface of the front floor placement groove is recessed inward to form at least any one of a longitudinal beam groove, a pedal groove, and a first picking groove;

[0021] The longitudinal beam groove is adapted to the longitudinal beam of the front floor, the pedal groove is adapted to the pedal of the front floor, and the first picking groove is located at the edge of the front floor placement groove.

[0022] Compared with the prior art, the beneficial effects achieved by the present utility model are as follows: The top surface of the packaging box body is provided with a front floor placement groove for accommodating the front floor and a front cross beam placement groove for accommodating the front seat installation cross beam at the same time, which solves the problem that the front floor and the front seat installation cross beam occupy a relatively large packaging space longitudinally after being assembled. The top surface of the packaging box body is also provided with a rear cross beam placement groove for accommodating the rear seat installation cross beam, which solves the problem of waste of storage and transportation resources caused by the independent packaging and transportation of the rear seat installation cross beam. Aiming at the problem that the front seat installation cross beam and the rear seat installation cross beam are prone to axial movement during storage and transportation, resulting in damage caused by extrusion at the end, the present utility model adopts technical measures that the rear cross beam placement groove is communicated with the front cross beam placement groove, and the rear seat installation cross beam and the front seat installation cross beam are overlapped at a right angle. The front seat installation cross beam provides a limiting resistance for the rear seat installation cross beam in its axial direction, and the rear seat installation cross beam provides a limiting resistance for the front seat installation cross beam in its axial direction, thereby restricting the front seat installation cross beam and the rear seat installation cross beam as a whole from moving left and right or forward and backward, and avoiding damage caused by lateral movement. In order to improve the utilization rate of the packaging space, the bottom surface of the packaging box body is recessed inward to form a plurality of second avoidance grooves for avoiding and accommodating the protruding parts of the contents in the lower packaging box body, thereby effectively reducing the height of the packaging box body and stacking a larger number of packaging box bodies in the limited longitudinal space. Description of the Drawings

[0023] Figure 1 is a top perspective view of the packaging box body in an embodiment of the present utility model;

[0024] Figure 2 is a top view of the packaging box body in an embodiment of the present utility model;

[0025] Figure 3 is a bottom perspective view of the packaging box body in an embodiment of the present utility model;

[0026] Figure 4 is a top perspective view of the front floor in an embodiment of the present utility model;

[0027] Figure 5 is a bottom perspective view of the front floor in an embodiment of the present utility model;

[0028] Figure 6 is a top perspective view of the front floor overlapping the front seat installation cross beam;

[0029] Figure 7It is a top perspective view of the top surface of the rear seat mounting crossbeam in the embodiment of the present utility model;

[0030] Figure 8 It is an end structure diagram of the rear seat mounting crossbeam;

[0031] Figure 9 It is an end structure diagram of the rear seat mounting crossbeam assembling with the front seat mounting crossbeam;

[0032] Figure 10 It is a top perspective view of the packing box body accommodating the front floor and the seat mounting crossbeam;

[0033] Figure 11 It is a top view of the packing box body accommodating the front floor and the seat mounting crossbeam;

[0034] Figure 12 It is a left view of the packing box body accommodating the front floor and the seat mounting crossbeam;

[0035] Figure 13 It is a top perspective view when two packing box bodies are stacked;

[0036] In the figure: 1. Front floor placement groove; 11. Longitudinal beam groove; 12. Pedal groove; 13. First avoidance groove; 14. First part-taking groove; 2. Rear crossbeam placement groove; 3. Front crossbeam placement groove; 4. Storage groove; 41. Second part-taking groove; 5. Packing box body; 51. Limit post; 52. Material-reducing groove; 53. Hollow opening; 54. Reinforcing partition; 55. Lifting groove; 56. Second avoidance groove; 6. Front floor; 61. Longitudinal beam; 62. Pedal; 7. Front seat mounting crossbeam; 71. Front crossbeam body; 72. Front crossbeam mounting seat; 73. Through opening; 8. Rear seat mounting crossbeam; 81. Rear crossbeam body; 82. Rear crossbeam mounting seat; 83. Connecting ear; 831. Card slot. Detailed implementation manners

[0037] The present utility model will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present utility model and cannot be used to limit the protection scope of the present utility model.

[0038] It should be noted that in the description of the present utility model, the orientation or positional relationships indicated by the terms "front", "rear", "left", "right", "up", "down", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model rather than requiring the present utility model to be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present utility model. The terms "front", "rear", "left", "right", "up", "down" used in the description of the present utility model refer to the directions in the drawings, and the terms "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component.

[0039] The specific embodiment of the present utility model provides a packing box for a front floor and a seat installation cross beam, which is formed by stacking a plurality of packing box bodies 5 longitudinally. Specifically, as Figure 13 shown, it is a top perspective view when two packing box bodies are stacked, and more packing box bodies 5 can also be stacked according to actual needs. The packing box body 5 is integrally formed with expanded polystyrene (EPS). EPS is a light polymer. It is made by adding a foaming agent to polystyrene resin and heating it to soften, generating gas, and forming a rigid closed-cell structure foam plastic, which has the characteristics of small water absorption, good heat preservation, light weight, and relatively high mechanical strength.

[0040] The specific structure of the packing box body 5 is as Figures 1 to 3 shown. The top surface of the packing box body 5 is recessed inward to form a front floor placement groove 1 for receiving the front floor 6, a front cross beam placement groove 3 for receiving the front seat installation cross beam 7, and a rear cross beam placement groove 2 for receiving the rear seat installation cross beam 8. Among them, the front floor placement groove 1 is adapted to the bottom surface structure of the front floor 6, the front cross beam placement groove 3 is adapted to the bottom surface structure of the front seat installation cross beam 7, and the rear cross beam placement groove 2 is adapted to the bottom surface structure of the rear seat installation cross beam 8. That is, the front floor 6, the front seat installation cross beam 7, and the rear seat installation cross beam 8 are all received in the corresponding placement grooves with their bottom surfaces facing downwards, and are laterally limited by the respective placement grooves, avoiding the adverse consequences of lateral movement due to inertia during storage and transportation, and then causing damage due to compression. In this embodiment, reminder marks corresponding to their received objects are provided beside the front floor placement groove 1, the front cross beam placement groove 3, and the rear cross beam placement groove 2. Among them, the top surfaces of the packing box body 5 beside the two front floor placement grooves 1 are respectively marked with "front floor - right" and "front floor - left", that is, they are respectively used to receive the right and left front floors 6; the top surface of the packing box body 5 beside the connection between the front cross beam placement groove 3 and the rear cross beam placement groove 2 is marked with "front and rear seat installation cross beams", that is, it is used to receive the front seat installation cross beam 7 and the rear seat installation cross beam 8, thereby prompting the staff on how to place the corresponding received objects and improving work efficiency.

[0041] The specific structure of the front floor 6 is as Figure 4 and Figure 5 shown. The front floor 6 is an overall planar structure, with an arc-shaped upturned pedal 62 at its front end and a significantly outwardly protruding longitudinal beam 61 on its back. The specific structure of the front seat installation cross beam 7 is as Figure 6As shown in the figure, it includes a front crossbeam body 71. There is a through opening 73 on the side of the front crossbeam body 71, and several front crossbeam mounting seats 72 are provided on the top surface of the front crossbeam body 71. The front seat mounting crossbeam 7 is assembled on the front floor 6. Usually, four front seat mounting crossbeams 7 are assembled on each vehicle. For every two front seat mounting crossbeams 7, one front-row vehicle seat is installed in a paired manner. The front-row vehicle seat is assembled on the front crossbeam mounting seat 72. The specific structure of the rear seat mounting crossbeam 8 is as Figure 7 and Figure 8 shown. It includes a rear crossbeam body 81. Several rear crossbeam mounting seats 82 are provided on the top surface of the crossbeam body 81. Both ends of the crossbeam body 81 extend outward to form connecting lugs 83. A card slot 831 formed by downward depression is provided in the middle section of the connecting lug 83 at one end. The rear seat mounting crossbeam 8 is assembled on the middle floor of the vehicle. Usually, two rear seat mounting crossbeams 8 are assembled on each vehicle, and one second-row seat is installed in a paired manner. It should be noted that the front seat mounting crossbeam 7 also has an end structure similar to that of the rear seat mounting crossbeam 8. The rear seat mounting crossbeam 8 is larger in external dimensions and heavier in weight than the front seat mounting crossbeam 7.

[0042] In this embodiment, two mutually matching front floor placement grooves 1 are provided on the packaging box body 5 to respectively accommodate the front floors 6 on the left and right sides of the center console, specifically as Figure 10 and Figure 11 shown. The bottom surface of the front floor placement groove 1 is recessed inward to form a longitudinal beam groove 11, a pedal groove 12, and a first picking groove 14. Among them, the longitudinal beam groove 11 is adapted to the longitudinal beam 61 of the accommodated front floor 6, and the pedal groove 12 is adapted to the pedal 62 of the accommodated front floor 6, playing a role of supporting and accommodating the longitudinal beam 61 and the pedal 62 respectively. The first picking groove 14 is located at the edge of the front floor placement groove 1. Since its depth is lower than the bottom surface of the front floor placement groove 1, the operator can reach into the back of the front floor 6 through the first picking groove 14 and smoothly take out the front floor 6 from the front floor placement groove 1, thus overcoming the problem that it is difficult to apply force to take out the front floor 6 due to its planar structure. There are two rear crossbeam placement grooves 2, which are distributed in parallel and correspondingly accommodate two rear seat mounting crossbeams 8. The front crossbeam placement groove 3 is perpendicular to the rear crossbeam placement groove 2 and correspondingly accommodates one front seat mounting crossbeam 7. The remaining three front seat mounting crossbeams 7 are still assembled on the front floor 6.

[0043] Both the front seat mounting crossbeam 7 and the rear seat mounting crossbeam 8 are long columnar structures. They have a large inertia and small resistance when moving along their axial directions. Even when housed in the corresponding placement grooves, they will still move axially and even jump out of the placement grooves due to inertia, causing damage to the end connection ears 83 due to extrusion. To address this technical problem, the present utility model adopts the technical measure that the rear crossbeam placement groove 2 communicates with the front crossbeam placement groove 3, and the rear seat mounting crossbeam 8 housed in the rear crossbeam placement groove 2 and the front seat mounting crossbeam 7 housed in the front crossbeam placement groove 3 overlap at a right angle to each other. The overlapping manner of the rear seat mounting crossbeam 8 and the front seat mounting crossbeam 7 is as Figure 9 shown, that is, the through opening 73 of the front crossbeam body 71 is penetrated by the connection ear 83 of the right rear seat mounting crossbeam 8 and is embedded in the card slot 831 of the connection ear 83; the connection ear 83 of the left rear seat mounting crossbeam 8 presses on the front crossbeam body 71. After the front seat mounting crossbeam 7 and the rear seat mounting crossbeam 8 are vertically overlapped, since the front seat mounting crossbeam 7 can provide a limiting resistance for the rear seat mounting crossbeam 8 in its axial direction, and the rear seat mounting crossbeam 8 can provide a limiting resistance for the front seat mounting crossbeam 7 in its axial direction, it is possible to limit the front seat mounting crossbeam 7 and the rear seat mounting crossbeam 8 as a whole from moving left and right or forward and backward, and avoid damage caused by lateral movement.

[0044] Since the end of the front seat mounting crossbeam 7 may exceed the lateral edge of the front floor 6 after the front floor 6 is assembled with the front seat mounting crossbeam 7, a first avoidance groove 13 adapted to the protrusion at the end of the assembled front seat mounting crossbeam 7 is formed by the inner depression of the side surface of the front floor placement groove 1, which serves to accommodate the protrusion at the end of the front seat mounting crossbeam 7.

[0045] Since there is a relatively large longitudinal dimension space after the front floor 6 is assembled with the front seat mounting crossbeam 7, a plurality of second avoidance grooves 56 are formed by the inner depression of the bottom surface of the packaging box body 5, which are adapted to the front crossbeam mounting seats 72 of the assembled front seat mounting crossbeam 7, that is, the front crossbeam mounting seats 72 are accommodated in the second avoidance grooves 56, thereby effectively reducing the height of the packaging box body 5 and stacking more packaging box bodies 5 in the limited longitudinal space, improving the utilization rate of the packaging space. Specifically, as Figure 12 shown, since the height of the packaging box body 5 is reduced, the front crossbeam mounting seats 72, the rear crossbeam mounting seats 82, and the pedals 62 all protrude upward from the top surface of the packaging box body 5. Therefore, the second avoidance grooves 56 are also adapted to the pedals 62 of the front floor 6, that is, the pedals 62 are accommodated in the second avoidance grooves 56; the second avoidance grooves 56 are also adapted to the front crossbeam mounting seats 72 of the front seat mounting crossbeam 7 housed in the front crossbeam placement groove 3, that is, the front crossbeam mounting seats 72 are accommodated in the second avoidance grooves 56; the second avoidance grooves 56 are also adapted to the rear crossbeam mounting seats 82 of the rear seat mounting crossbeam 8 housed in the rear crossbeam placement groove 2, that is, the rear crossbeam mounting seats 82 are accommodated in the second avoidance grooves 56.

[0046] As a preferred solution, the bottom surfaces of the front floor placement groove 1, the front crossbeam placement groove 3, and the rear crossbeam placement groove 2 are all recessed inward to form hollow openings 53 that penetrate to the ground of the packaging box body 5. While playing the role of saving materials and reducing weight, it also plays the same role as the second avoidance groove 56, that is, accommodating and avoiding the protruding parts of the contents in the lower packaging box body 5.

[0047] As a preferred solution, the top surface of the packaging box body 5 is also recessed inward to form a storage groove 4 and a second picking groove 41 communicating with the storage groove 4. The storage groove 4 can accommodate the accessories for supporting use, and the second picking groove 41 facilitates the operator to take out the accessories in the storage groove 4.

[0048] As a preferred solution, the bottom surface of the packaging box body 5 is also recessed inward to form a material reduction groove 52, which plays the role of saving materials and reducing weight. Between adjacent material reduction grooves 52, between adjacent second avoidance grooves 56, and between the material reduction groove 52 and the second avoidance groove 56, there are all formed reinforcing partitions 54 that are flush with the bottom surface of the packaging box body 5, which play the role of structural reinforcement. The bottom surface of the packaging box body 5 is also recessed inward to form a lifting groove 55 communicating with the side surface of the packaging box body 5. When multiple packaging box bodies 5 are stacked, it is convenient for the operator to lift the packaging box body 5 smoothly through the lifting groove 55.

[0049] As a preferred solution, the top surface of the packaging box body 5 protrudes outward to form a limit post 51, and the inner edge of the material reduction groove 52 is adapted to the limit post 51. When multiple packaging box bodies 5 are stacked, the limit post 51 of the lower packaging box body 5 just fits into the inner edge of the material reduction groove 52 of the upper packaging box body 5, so as to play a lateral limiting role for adjacent packaging box bodies 5 and prevent overturning in the case of stacking.

[0050] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and deformations can be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. A packaging box for front floor and seat mounting crossbeams, characterized in that: The packaging box comprises at least two longitudinally distributed packaging box bodies (5), the top surface of the packaging box body (5) being inwardly recessed to form a front floor placement groove (1) for accommodating a front floor (6) and a front crossbeam placement groove (3) for accommodating a front seat mounting crossbeam (7); The front floor placement groove (1) is matched with the bottom surface structure of the front floor (6), and the front crossbeam placement groove (3) is matched with the bottom surface structure of the front seat mounting crossbeam (7).

2. The packaging box according to claim 1, characterized in that: The bottom surface of the packaging box body (5) is inwardly recessed to form a second avoidance groove (56), and the second avoidance groove (56) is adapted to the pedal (62) of the front floor (6) and / or the front crossbeam mounting seat (72) of the front seat mounting crossbeam (7).

3. The packaging box according to claim 2, characterized in that: The front floor (6) received in the front floor placement groove (1) is equipped with a front seat mounting cross beam (7), and the side surface of the front floor placement groove (1) is recessed inward to form a first avoidance groove (13) adapted to the protrusion at the end of the assembled front seat mounting cross beam (7); The second avoidance groove (56) is also compatible with a front crossbeam mounting seat (72) of the assembled front seat mounting crossbeam (7).

4. The packaging box according to claim 2, characterized in that: The top surface of the packaging box body (5) is also recessed inwardly to form a storage groove (4) and / or a rear crossbeam placement groove (2) for accommodating the rear seat mounting crossbeam (8), and the rear crossbeam placement groove (2) is adapted to the bottom surface structure of the rear seat mounting crossbeam (8); The second avoidance groove (56) is also adapted to a rear crossbeam mounting seat (82) of the rear seat mounting crossbeam (8).

5. The packaging box according to claim 4, characterized in that: The top surface of the packaging box body (5) is also recessed inwardly to form a second item taking slot (41) that is connected to the item storage slot (4).

6. The packaging box according to claim 4, characterized in that: The rear crossbeam placement groove (2) is connected to the front crossbeam placement groove (3); the rear seat installation crossbeam (8) accommodated in the rear crossbeam placement groove (2) and the front seat installation crossbeam (7) accommodated in the front crossbeam placement groove (3) overlap each other at a vertical angle.

7. The packaging box according to claim 4, characterized in that: The bottom surface of at least any one of the front floor placement groove (1), the front crossbeam placement groove (3), and the rear crossbeam placement groove (2) is inwardly recessed to form a hollow opening (53).

8. The packaging box according to any one of claims 2 to 7, characterized in that: The bottom surface of the packaging box body (5) is also inwardly recessed to form a material reduction groove (52) and / or a hand-lifting groove (55) connected to the side of the packaging box body (5); At least one of the adjacent material reduction grooves (52), the adjacent second avoidance grooves (56), and the material reduction groove (52) and the second avoidance groove (56) is formed with a reinforcing partition (54) having the same height as the bottom surface of the packaging box body (5).

9. The packaging box according to claim 8, characterized in that: The top surface of the packaging box body (5) protrudes outward to form a limiting column (51), and the inner edge of the material reduction groove (52) is adapted to the limiting column (51).

10. The packaging box according to any one of claims 1 to 7, characterized in that: The bottom surface of the front floor placement groove (1) is inwardly concave to form at least one of a longitudinal beam groove (11), a pedal groove (12), and a first piece-taking groove (14); The longitudinal beam groove (11) is matched with the longitudinal beam (61) of the front floor (6), the pedal groove (12) is matched with the pedal (62) of the front floor (6), and the first piece-removing groove (14) is located at the edge of the front floor placement groove (1).

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