Lower side door of railway wagon

Abstract

The technical problem to be solved by the utility model is to provide the lower side door of the railway wagon, and the lower side door can effectively improve the rigidity and deformation resistance of a door frame and the lower side door and effectively reduce the transportation cost. The lower side door comprises a door plate, a left side cap-shaped beam, a right side cap-shaped beam, an upper side cap-shaped beam, a lower side cap-shaped beam and a center cap-shaped beam are arranged on the door plate, L-shaped reinforcing beams are arranged on the left side, the right side and the lower side of the door plate and located on the left side cap-shaped beam, the right side cap-shaped beam and the lower side cap-shaped beam respectively, and a circle of sealing plate is arranged on the peripheral edge of the outer side surface of the door plate. Four profiling door frames are arranged on the edges of the periphery of the lower side door opening respectively, the problem that the rigidity of the lower side door is insufficient is solved through the L-shaped reinforcing beams and the sealing plates, the overall rigidity and the deformation resistance of the lower side door are improved, the problem that the rigidity of the periphery of the door opening is insufficient is solved through the four profiling door frames, and the deformation capacity of the door opening bearing external force collision is improved. A wedge-shaped sealing principle is adopted between the profiling door frame and the improved lower side door.

Description

Technical Field

[0001] The utility model relates to the technical field of railway freight cars, in particular to a lower side door of a railway freight car. Background Art

[0002] Railway freight cars are mainly used to transport bulk goods such as coal, ore, steel, and building materials. With the rapid development of container transportation in recent years, they have been widely used in container transportation. They are used to transport a variety of goods with their strong versatility and high efficiency. At present, the total number of freight cars of the China Railway Group is about 850,000, of which the total number of railway freight cars is about 510,000, accounting for 60.47%, mainly C64 and C70 series railway freight cars.

[0003] Due to the various loading and unloading methods of railway freight cars, long-term exposure to the sun and rain, external force collisions and impacts of loading and unloading vehicles, chemical erosion of transportation media and other harsh operating conditions, existing railway freight cars have problems such as door deformation and damage, and large door gaps. According to statistics from the China Railway Corporation, from January to August 2020 alone, about 400,000 damaged cars were repaired due to deformation and damage of side doors and door frames, and large door gaps, with a liquidation cost of about 700 million yuan, accounting for about 80% of the total temporary repair costs of freight cars; at the same time, in order to reduce the leakage of bulk cargo such as coal during transportation due to large door gaps, the cost of sealing car doors with foam glue and other materials is more than 1 billion yuan each year, which seriously increases transportation costs and squeezes out transportation benefits. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a lower side door of a railway freight car, which can effectively improve the rigidity and anti-deformation ability of the door frame and the lower side door, and effectively reduce the transportation cost.

[0005] The utility model solves the technical problem by adopting the following technical solution: the lower side door of a railway freight car comprises a lower side door opening and a lower side door body structure arranged on the side wall of the railway freight car, the lower side door body structure comprises a door panel, the door panel is provided with a concave left side cap beam, a right side cap beam, an upper side cap beam, and a lower side cap beam, which are sequentially connected end to end to form a round-shaped structure, the middle part of the door panel is provided with a concave central cap beam and is located inside the round-shaped structure, the left side, the right side and the lower side of the inner side surface of the door panel are all provided with L-shaped reinforcing beams and are respectively located on the left side cap beam, the right side cap beam and the lower side cap beam;

[0006] The angle between the two side walls of the L-shaped reinforcement beam is greater than 90 degrees, one end of the L-shaped reinforcement beam is arranged on the top of the hat-shaped beam on the corresponding side and the side wall where the end is located is parallel to the top of the hat-shaped beam on the corresponding side, and the other end of the L-shaped reinforcement beam is obliquely arranged on the inner surface of the door panel and located on the outer side of the hat-shaped beam on the corresponding side;

[0007] A circle of sealing plates is provided at the edges of the outer surface of the door panel;

[0008] The edges of the lower door opening are respectively provided with a contoured upper door frame, a contoured lower door frame, a contoured left door frame, and a contoured right door frame, which together form a circular frame structure, and a curved self-sealing structure is formed between the contoured upper door frame, the contoured lower door frame, the contoured left door frame, the contoured right door frame and the sealing plate;

[0009] The upper end of the door panel is arranged on the side wall of the carriage of the railway freight car through a hinge structure, and the lower end of the door panel is arranged on the side wall of the carriage of the railway freight car through a buckle structure.

[0010] Furthermore, the contoured upper door frame includes a first contoured plate A, a second contoured plate A, a third contoured plate A, and a fourth contoured plate A;

[0011] The rear end of the first profiling plate A is arranged on the side wall of the railway freight car, the upper end of the second profiling plate A is connected to the front end of the first profiling plate A, and the second profiling plate A is parallel to the side wall of the railway freight car;

[0012] The third profiling plate A is arranged at an angle and its front end is connected to the lower end of the second profiling plate A obliquely downward. The lower end of the fourth profiling plate A is connected to the rear end of the third profiling plate A. The fourth profiling plate A is arranged on the side wall of the railway freight car. The height of the fourth profiling plate A is less than half of the height of the second profiling plate A.

[0013] Furthermore, the contoured right door frame has the same structure as the contoured left door frame and is symmetrically arranged, and the contoured right door frame includes a first contour plate B, a second contour plate B, a third contour plate B, and a fourth contour plate B;

[0014] The rear end of the first profiling plate B is arranged on the side wall of the railway freight car, the right end of the second profiling plate B is connected to the front end of the first profiling plate B, and the second profiling plate B is parallel to the side wall of the railway freight car;

[0015] The third profiling plate B is arranged obliquely and its front end is connected to the left end of the second profiling plate B obliquely to the right, the left end of the fourth profiling plate B is connected to the rear end of the third profiling plate B, the fourth profiling plate B is arranged on the side wall of the railway freight car, and the left and right width of the fourth profiling plate B is less than half of the left and right width of the second profiling plate B;

[0016] When the left side wall of the sealing plate contacts the second profiling plate B to form a curved self-sealing, the third profiling plate B and a side wall of the corresponding L-shaped reinforcing beam are parallel to each other and there is a gap between them.

[0017] Furthermore, the contoured lower door frame includes a first contoured plate C, a second contoured plate C, a third contoured plate C, and a fourth contoured plate C;

[0018] The rear end of the first profiling plate C is arranged on the lower side wall of the lower door opening, the rear end of the second profiling plate C is connected obliquely upward to the front end of the first profiling plate C, the front end of the second profiling plate C is connected obliquely downward to the upper end of the third profiling plate C, and the third profiling plate C is parallel to the side wall of the railway freight car;

[0019] The rear end of the fourth profiling plate C is arranged on the side wall of the railway freight car, and the front end of the fourth profiling plate C is connected to the lower end of the third profiling plate C;

[0020] When the lower side wall of the sealing plate contacts the third profiling plate C to form a curved path self-sealing, the second profiling plate C and a side wall of the corresponding L-shaped reinforcing beam are parallel to each other and there is a gap between them.

[0021] Furthermore, the folding structure includes two folding leaves and two folding seats which are symmetrically arranged on the left and right sides;

[0022] Each folding seat includes a rear side plate, a first left side plate, a first right side plate, a second left side plate, and a second right side plate, wherein the first left side plate and the first right side plate are respectively arranged at the left and right ends of the rear side plate and are perpendicular to each other;

[0023] The sum of the thickness of the rear side plate and the front-to-rear length of the first left side plate or the first right side plate is equal to the front-to-rear length of the contoured upper door frame;

[0024] The second left side plate and the second right side plate are in the shape of a right-angled trapezoid, and the end surfaces where the lower bottom edges of the second left side plate and the second right side plate are located are fixedly connected to the front end surfaces of the first left side plate and the first right side plate respectively;

[0025] The upper and lower widths of the second left side plate and the second right side plate are greater than the upper and lower widths of the first left side plate and the first right side plate; a notch is formed between the second left side plate and the first left side plate, and between the second right side plate and the first right side plate, and is adapted to the upper contoured door frame, and the left and right sides of the contoured upper door frame are respectively located in the two notches;

[0026] The two hinges are respectively arranged on the outer surface of the door panel and located on the left and right sides of the central hat beam. The upper ends of the two hinges are respectively located in two hinge seats and are movably connected through latches.

[0027] Furthermore, the buckle structure includes two buckle components that are symmetrically arranged on the left and right and correspond to the two hinges respectively, and each buckle component includes a rear fixing plate, a left fixing plate, and a right fixing plate;

[0028] The rear end of the left fixing plate is arranged at the left end of the rear fixing plate and the two are perpendicular to each other, the right fixing plate is arranged at the middle right position of the rear fixing plate and the two are perpendicular to each other, the spacing between the left fixing plate and the right fixing plate is greater than or equal to the left and right widths of the hinge, and the hinge is located between the corresponding left fixing plate and the right fixing plate;

[0029] The left fixing plate is provided with a mounting through hole along the front-rear direction thereof, and a semi-threaded bolt is provided in the mounting through hole;

[0030] A mounting groove is arranged at the front end of the upper side wall of the left fixing plate and is connected with the mounting through hole, a buckle plate is arranged in the mounting groove, one end of the buckle plate is arranged in the mounting groove by a semi-threaded bolt and can rotate freely along the semi-threaded bolt, a limiting groove is arranged on the left side surface of the right fixing plate, the upper side wall of the limiting groove coincides with the upper end surface of the right fixing plate, and the other end of the buckle plate is located in the limiting groove.

[0031] Furthermore, the L-shaped reinforcing beam, the sealing plate, the contoured upper door frame, the contoured lower door frame, the contoured left door frame, and the contoured right door frame are all made of Q450NQR1 high-strength weathering steel.

[0032] Beneficial effects of the utility model:

[0033] 1. An L-shaped reinforcement beam is arranged on both sides and the lower profile of the existing lower door panel, and a circle of sealing plate is arranged at the edge of the existing lower door panel, which solves the problem of insufficient rigidity of the lower door and improves the overall rigidity and anti-deformation ability of the lower door.

[0034] 2. A contoured upper door frame, a contoured lower door frame, a contoured left door frame, and a contoured right door frame are arranged on the outer periphery of the existing lower door opening, forming a frame structure around the door opening to solve the problem of insufficient rigidity around the door opening and improve the door opening's ability to withstand deformation due to external forces. The wedge-shaped sealing principle is adopted between the contoured door frame and the improved lower door to form a curved self-sealing structure, thereby improving the door sealing performance from a structural principle. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of the outer side of the lower side door of the railway freight car described in the utility model;

[0036] Figure 2 It is a structural schematic diagram of the inner side of the lower side door of the railway freight car described in the utility model;

[0037] Figure 3 A bottom view of the structure of the door panel of the utility model;

[0038] Figure 4 for Figure 3 A partial enlarged view of middle A;

[0039] Figure 5 for Figure 3 A partial enlarged view of B in the middle;

[0040] Figure 6 It is a side view of the door panel described in the utility model;

[0041] Figure 7 It is a structural schematic diagram of the vehicle compartment side wall, lower door opening, contoured upper door frame, contoured lower door frame, contoured left door frame, contoured right door frame, hinged seat, and buckle structure combination described in the utility model;

[0042] Figure 8 It is a cross-sectional view of the structure of the contoured upper door frame and the folding seat assembly described in the utility model;

[0043] Fig. 9 It is a cross-sectional view of the structure of the door panel, L-shaped reinforcement beam, contoured right door frame and sealing plate assembly described in the utility model;

[0044] Fig.10 It is a cross-sectional view of the structure of the door panel, L-shaped reinforcement beam, contoured lower door frame, sealing plate, and buckle structure combination described in the utility model;

[0045] Fig.11 It is a structural schematic diagram of the buckle structure described in the utility model;

[0046] Fig.12 It is a structural schematic diagram of the folding seat described in the utility model;

[0047] Markings in the figure: door panel 1, L-shaped reinforcement beam 2, first reinforcement plate 201, second reinforcement plate 202, profiling upper door frame 3, first profiling plate A301, second profiling plate A302, third profiling plate A303, fourth profiling plate A304, profiling left door frame 4, profiling right door frame 5, first profiling plate B501, second profiling plate B502, third profiling plate B503, fourth profiling plate B504, profiling lower door frame 6, first profiling plate C601, second profiling plate C602, third profiling plate C603, fourth profiling plate C604, hinge Structure 7, hinge 701, hinge seat 702, rear side plate 7021, first left side plate 7022, first right side plate 7023, second left side plate 7024, second right side plate 7025, notch 703, buckle structure 8, rear side fixing plate 801, left side fixing plate 802, right side fixing plate 803, semi-threaded bolt 804, limiting groove 805, buckle plate 806, left side cap beam 9, right side cap beam 10, upper side cap beam 11, lower side cap beam 12, center cap beam 13, sealing plate 14, car side wall 15, lower side door opening 16. DETAILED DESCRIPTION

[0048] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0049] It should be noted that the directions or positional relationships indicated by all directional indication terms such as "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" in the embodiments of the present application are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. They are only used to explain the relative positional relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0050] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0052] like Figure 1-12As shown, the lower side door of a railway freight car comprises a lower side door opening 16 and a lower side door body structure arranged on a side wall 15 of the railway freight car, wherein the lower side door body structure comprises a door panel 1, wherein the door panel 1 is provided with a concave left side cap beam 9, a right side cap beam 10, an upper side cap beam 11, and a lower side cap beam 12, which are connected end to end in sequence to form a round-shaped structure, generally die-casting is adopted, and the cap beam is to make the round-shaped structure area of ​​the outer surface of the door panel 1 concave, so that the area corresponding to the inner surface of the door panel 1 is The domain is convex, and the middle part of the door panel 1 is provided with a concave central hat beam 13 and is located inside the round-shaped structure. The central hat beam 13 is the same as the above-mentioned four hat beams. It should be noted that the door panel 1 and the left hat beam 9, the right hat beam 10, the upper hat beam 11, the lower hat beam 12, and the central hat beam 13 are all existing. The left side, the right side, and the lower side of the inner surface of the door panel 1 are provided with L-shaped reinforcement beams 2 and are respectively located on the left hat beam 9, the right hat beam 10, and the lower hat beam 12;

[0053] The angle between the two side walls of the L-shaped reinforcement beam 2 is greater than 90 degrees, that is, the L-shaped reinforcement beam 2 includes a first reinforcement plate 201 and a second reinforcement plate 202, one end of the first reinforcement plate 201 is fixedly connected to one end of the second reinforcement plate 202 to form a structure similar to an L shape, and the angle between one end of the first reinforcement plate 201 and the right angle of the second reinforcement plate 202 is greater than 90 degrees, that is, the two are not perpendicular to each other, one end of the L-shaped reinforcement beam 2 is arranged on the top of the hat-shaped beam on the corresponding side and the side wall where the end is located is parallel to the top of the hat-shaped beam on the corresponding side, that is, the first reinforcement plate 201 is fixedly connected to the outer surface of the raised portion of the hat-shaped beam on the corresponding side, generally by welding. In a certain manner, the area of ​​the raised portion of the cap-shaped beam on the corresponding side covered by the first reinforcing plate 201 is greater than two-thirds of the area of ​​the raised portion of the cap-shaped beam, the first reinforcing plate 201 and the door panel 1 are parallel to each other, and the other end of the L-shaped reinforcing beam 2 is obliquely arranged on the inner surface of the door panel 1 and located on the outer side of the cap-shaped beam on the corresponding side, that is, the end of the second reinforcing plate 202 away from the first reinforcing plate 201 is fixed to the area of ​​the inner surface of the door panel 1 close to the outer edge, and the two are generally fixed by welding. Since the angle between one end of the first reinforcing plate 201 and the right angle of the second reinforcing plate 202 is greater than 90 degrees, the second reinforcing plate 202 is in an inclined state and is not perpendicular to the door panel 1;

[0054] A circle of sealing plates 14 are arranged around the edges of the outer surface of the door panel 1, and the rigidity and anti-deformation capability of the door panel 1 are enhanced by the sealing plates 14 and three L-shaped reinforcing beams 2;

[0055] The edges of the lower door opening 16 are respectively provided with a profiled upper door frame 3, a profiled lower door frame 6, a profiled left door frame 4, and a profiled right door frame 5, which together form a circular frame structure. A curved self-sealing structure is formed between the profiled upper door frame 3, the profiled lower door frame 6, the profiled left door frame 4, the profiled right door frame 5 and the sealing plate 14, that is, the four profiled door frames and the door plate 1 form an embedded curved sealing structure, so that the door gap is small, and the rigidity and anti-deformation ability of the lower door opening 16 are strengthened by the four profiled door frames;

[0056] The upper end of the door panel 1 is arranged on the side wall 15 of the railway freight car through a hinge structure 7, and the hinge structure 7 is used for the rotation of the door panel 1. The lower end of the door panel 1 is arranged on the side wall 15 of the railway freight car through a buckle structure 8, and the buckle structure 8 is used to fix the door panel 1 to close the lower door opening 16.

[0057] like Figure 7 , Figure 8 As shown, in this embodiment, as a preference, the profiling upper door frame 3 includes a first profiling plate A301, a second profiling plate A302, a third profiling plate A303, and a fourth profiling plate A304;

[0058] The rear end of the first profiling plate A301 is arranged on the side wall 15 of the railway freight car, and is generally fixed to the side wall 15 of the railway freight car by welding. The upper end of the second profiling plate A302 is connected to the front end of the first profiling plate A301, and the second profiling plate A302 is parallel to the side wall 15 of the railway freight car.

[0059] The third profiling plate A303 is tilted and its front end is connected to the lower end of the second profiling plate A302 obliquely downward. The lower end of the fourth profiling plate A304 is connected to the rear end of the third profiling plate A303. The fourth profiling plate A304 is arranged on the side wall 15 of the railway freight car and is generally fixed to the side wall 15 of the railway freight car by welding. The height of the fourth profiling plate A304 is less than half of the height of the second profiling plate A302. The first profiling plate A301, the second profiling plate A302, the third profiling plate A303, and the fourth profiling plate A304 are generally integrally formed, and a tortuous passage is formed by the first profiling plate A301, the second profiling plate A302, the third profiling plate A303, the fourth profiling plate A304 and the side wall 15 of the railway freight car.

[0060] like Figure 7 , Fig. 9 As shown, in this embodiment, as a preference, the profiling right door frame 5 has the same structure as the profiling left door frame 4 and is symmetrically arranged, and the profiling right door frame 5 includes a first profiling plate B501, a second profiling plate B502, a third profiling plate B503, and a fourth profiling plate B504;

[0061] The rear end of the first profiling plate B501 is arranged on the side wall 15 of the railway freight car, and is generally fixed to the side wall 15 of the railway freight car by welding. The right end of the second profiling plate B502 is connected to the front end of the first profiling plate B501, and the second profiling plate B502 is parallel to the side wall 15 of the railway freight car.

[0062] The third profiling plate B503 is tilted and its front end is connected to the left end of the second profiling plate B502 obliquely to the right. The left end of the fourth profiling plate B504 is connected to the rear end of the third profiling plate B503. The fourth profiling plate B504 is arranged on the side wall 15 of the railway freight car and is generally fixed to the side wall 15 by welding. The left and right width of the fourth profiling plate B504 is less than half of the left and right width of the second profiling plate B502. The first profiling plate B501, the second profiling plate B502, the third profiling plate B503 and the fourth profiling plate B504 are generally formed in one piece.

[0063] When the left side wall of the sealing plate 14 contacts the second profiling plate B502 to form a curved self-sealing, the third profiling plate B503 is parallel to the side wall of the L-shaped reinforcing beam 2 on the corresponding side and there is a gap between the two, that is, the third profiling plate B503 is parallel to the second reinforcing plate 202 of the L-shaped reinforcing beam 2 on the corresponding side and there is a gap between the two;

[0064] It should be noted that the contoured right door frame 5 has the same structure as the contoured left door frame 4 and is symmetrically arranged. The contoured right door frame 5 is described here, and the structure of the contoured left door frame 4 can refer to the contoured right door frame 5 and no repeated description is made.

[0065] like Figure 7 , Fig.10 As shown, in this embodiment, as a preference, the contoured lower door frame 6 includes a first contour plate C601, a second contour plate C602, a third contour plate C603, and a fourth contour plate C604;

[0066] The rear end of the first profiling plate C601 is arranged on the lower side wall of the lower door opening 16, and is generally fixed to the lower side wall of the lower door opening 16 by welding. The front end of the first profiling plate C601 is arranged obliquely upward, the rear end of the second profiling plate C602 is connected obliquely upward to the front end of the first profiling plate C601, and the front end of the second profiling plate C602 is arranged obliquely downward. The upper end of the third profiling plate C603 is connected to the front end of the second profiling plate C602, and the third profiling plate C603 is parallel to the side wall 15 of the railway freight car.

[0067] The rear end of the fourth profiling plate C604 is arranged on the side wall 15 of the railway freight car, and is generally fixed to the side wall 15 of the railway freight car by welding. The front end of the fourth profiling plate C604 is connected to the lower end of the third profiling plate C603, and a tortuous passage is formed together with the first profiling plate C601, the second profiling plate C602, the third profiling plate C603, the fourth profiling plate C604 and the side wall 15 of the railway freight car. The first profiling plate C601, the second profiling plate C602, the third profiling plate C603, and the fourth profiling plate C604 are generally formed in one piece.

[0068] When the lower side wall of the sealing plate 14 contacts the third profiling plate C603 to form a curved self-sealing, the second profiling plate C602 and the side wall of the L-shaped reinforcing beam 2 on the corresponding side are parallel to each other and there is a gap between the two, that is, the second profiling plate C602 and the second reinforcing plate 202 of the L-shaped reinforcing beam 2 on the corresponding side are parallel to each other and there is a gap between the two.

[0069] like Figure 7 , Fig.10 , Fig.12 As shown, in this embodiment, as a preference, the folding structure 7 includes two folding leaves 701 and two folding seats 702 that are symmetrically arranged on the left and right;

[0070] Each folding seat 702 includes a rear side plate 7021, a first left side plate 7022, a first right side plate 7023, a second left side plate 7024, and a second right side plate 7025. The first left side plate 7022 and the first right side plate 7023 are respectively arranged at the left and right ends of the rear side plate 7021 and are perpendicular to each other.

[0071] The sum of the thickness of the rear side plate 7021 and the front-to-rear length of the first left side plate 7022 or the first right side plate 7023 is equal to the front-to-rear length of the contoured upper door frame 3;

[0072] The second left side plate 7024 and the second right side plate 7025 are in the shape of a right-angled trapezoid. The end surfaces of the lower bottom edges of the second left side plate 7024 and the second right side plate 7025 are fixedly connected to the front end surfaces of the first left side plate 7022 and the first right side plate 7023, respectively. The upper end surfaces of the second left side plate 7024 and the second right side plate 7025 are flush with the upper end surfaces of the first left side plate 7022 or the first right side plate 7023.

[0073] The upper and lower widths of the second left side plate 7024 and the second right side plate 7025 are greater than the upper and lower widths of the first left side plate 7022 and the first right side plate 7023, and the front-to-rear lengths of the second left side plate 7024 and the second right side plate 7025 are greater than the thickness of the contoured upper door frame 3; a notch 703 is formed between the second left side plate 7024 and the first left side plate 7022, and between the second right side plate 7025 and the first right side plate 7023, and the contoured upper door frame 3 is located in the two notches 703, and the rear side plate 7021, the first left side plate 7022, the first right side plate 7023, the second left side plate 7024, and the second right side plate 7025 are generally integrally formed, and the rear side plate 7021 is generally welded to the side wall 15 of the vehicle compartment, and the first left side plate 7022, the first right side plate 7023, the second left side plate 7024, and the second right side plate 7025 are respectively welded to the contoured upper door frame 3;

[0074] The two hinges 701 are respectively arranged on the outer surface of the door panel 1 and are located on the left and right sides of the central hat beam 13, that is, the left hinge 701 is located between the left hat beam 9 and the central hat beam 13, and the right hinge 701 is located between the right hat beam 10 and the central hat beam 13. The upper ends of the two hinges 701 are respectively located in the two hinge seats 702 and are movably connected by latches, that is, the front end of each second left side plate 7024, the second right side plate 7025 and the upper end of each hinge 701 are provided with perforations, and the latches pass through the perforations of the second left side plate 7024, the corresponding perforations at the upper ends of the hinges 701, and the perforations of the second right side plate 7025 in sequence. When the door panel 1 closes the lower door opening 16, the surrounding areas of the sealing plate 14 are sealed and contacted with the contoured upper door frame 3, the contoured lower door frame 6, the contoured left door frame 4, and the contoured right door frame 5 respectively.

[0075] like Figure 7 , Fig.11 As shown, in this embodiment, as a preference, the buckle structure 8 includes two buckle components that are symmetrically arranged on the left and right and correspond to the two hinges 701 respectively, and each buckle component includes a rear fixing plate 801, a left fixing plate 802, and a right fixing plate 803;

[0076] The rear end of the left fixing plate 802 is arranged at the left end of the rear fixing plate 801 and the two are perpendicular to each other. The right fixing plate 803 is arranged at the right position of the middle of the rear fixing plate 801 and the two are perpendicular to each other. The rear fixing plate 801 is generally welded to the side wall 15 of the railway freight car. The spacing between the left fixing plate 802 and the right fixing plate 803 is greater than or equal to the left and right widths of the hinge 701. Generally, it is slightly larger than the left and right widths of the hinge 701 so that the hinge 701 can be inserted without scratching. The hinge 701 is located between the corresponding left fixing plate 802 and the right fixing plate 803.

[0077] The left side plate is provided with a mounting through hole along the front-rear direction thereof, a semi-threaded bolt 804 is provided in the mounting through hole, and a matching nut is provided on the semi-threaded bolt 804;

[0078] The front end of the upper side wall of the left fixed plate 802 is provided with an installation groove and is connected to the installation through hole, and a buckle plate 806 is provided in the installation groove, one end of the buckle plate 806 is set in the installation groove by a semi-threaded bolt 804 and can rotate freely along the semi-threaded bolt 804, and a limiting groove 805 is provided on the left surface of the right fixed plate 803, and the upper side wall of the limiting groove 805 coincides with the upper end surface of the right fixed plate 803, and the other end of the buckle plate 806 is located in the limiting groove 805. When the door panel 1 closes the lower door opening 16, the hinge 701 is located between the corresponding left fixed plate 802 and the right fixed plate 803 and just contacts with the rear fixed plate 801, and the corresponding lower end of the hinge 701 can be conveniently locked through the buckle plate 806 and the limiting groove 805, thereby fixing the door panel 1 and realizing the closure of the lower door opening 16.

[0079] In this embodiment, as a preference, the L-shaped reinforcing beam 2, the sealing plate 14, the contoured upper door frame 3, the contoured lower door frame 6, the contoured left door frame 4, and the contoured right door frame 5 are all made of Q450NQR1 high-strength weathering steel. By adopting high-strength weathering steel, the rigidity and deformation resistance of the lower door opening 16 and the door panel 1 are further improved.

[0080] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A lower side door of a railway freight car, comprising a lower side door opening (16) and a lower side door structure arranged on a side wall (15) of a railway freight car, wherein the lower side door structure comprises a door panel (1), wherein the door panel (1) is provided with a concave left side cap beam (9), a right side cap beam (10), an upper side cap beam (11), and a lower side cap beam (12), which are connected end to end in sequence to form a circular structure, wherein a concave central cap beam (13) is arranged in the middle of the door panel (1) and is located inside the circular structure, and wherein the door panel (1) is characterized in that: The left side, right side and lower side of the inner surface of the door panel (1) are all provided with L-shaped reinforcement beams (2) which are respectively located on the left side cap beam (9), the right side cap beam (10) and the lower side cap beam (12); The angle between the two side walls of the L-shaped reinforcement beam (2) is greater than 90 degrees, one end of the L-shaped reinforcement beam (2) is arranged on the top of the hat-shaped beam on the corresponding side and the side wall where the end is located is parallel to the top of the hat-shaped beam on the corresponding side, and the other end of the L-shaped reinforcement beam (2) is obliquely arranged on the inner surface of the door panel (1) and is located outside the hat-shaped beam on the corresponding side; A circle of sealing plates (14) are provided at the edges of the outer surface of the door panel (1); The edges of the lower door opening (16) are respectively provided with a contoured upper door frame (3), a contoured lower door frame (6), a contoured left door frame (4), and a contoured right door frame (5), which together form a circular frame structure; a curved self-sealing structure is formed between the contoured upper door frame (3), the contoured lower door frame (6), the contoured left door frame (4), the contoured right door frame (5) and the sealing plate (14); The upper end of the door panel (1) is arranged on the side wall (15) of the railway freight car through a hinge structure (7), and the lower end of the door panel (1) is arranged on the side wall (15) of the railway freight car through a buckle structure (8).

2. A lower side door of a railway freight car according to claim 1, characterized in that: The contoured upper door frame (3) comprises a first contour plate A (301), a second contour plate A (302), a third contour plate A (303), and a fourth contour plate A (304); The rear end of the first profiling plate A (301) is arranged on the side wall (15) of the railway freight car, the upper end of the second profiling plate A (302) is connected to the front end of the first profiling plate A (301), and the second profiling plate A (302) is parallel to the side wall (15) of the railway freight car; The third profiling plate A (303) is arranged obliquely and its front end is connected to the lower end of the second profiling plate A (302) obliquely downward. The lower end of the fourth profiling plate A (304) is connected to the rear end of the third profiling plate A (303). The fourth profiling plate A (304) is arranged on the side wall (15) of the railway freight car. The height of the fourth profiling plate A (304) is less than half the height of the second profiling plate A (302).

3. The lower side door of a railway freight car according to claim 1, characterized in that: The profiling right door frame (5) has the same structure as the profiling left door frame (4) and is arranged symmetrically on both sides. The profiling right door frame (5) comprises a first profiling plate B (501), a second profiling plate B (502), a third profiling plate B (503) and a fourth profiling plate B (504); The rear end of the first profiling plate B (501) is arranged on the side wall (15) of the railway freight car, the right end of the second profiling plate B (502) is connected to the front end of the first profiling plate B (501), and the second profiling plate B (502) is parallel to the side wall (15) of the railway freight car; The third profiling plate B (503) is arranged obliquely and its front end is connected to the left end of the second profiling plate B (502) obliquely to the right, the left end of the fourth profiling plate B (504) is connected to the rear end of the third profiling plate B (503), the fourth profiling plate B (504) is arranged on the side wall (15) of the railway freight car, and the left and right width of the fourth profiling plate B (504) is less than half of the left and right width of the second profiling plate B (502); When the left side wall of the sealing plate (14) contacts the second profiling plate B (502) to form a curved self-sealing, the third profiling plate B (503) and a side wall of the corresponding L-shaped reinforcing beam (2) are parallel to each other and there is a gap between them.

4. The lower side door of a railway freight car according to claim 1, characterized in that: The contoured lower door frame (6) comprises a first contour plate C (601), a second contour plate C (602), a third contour plate C (603), and a fourth contour plate C (604); The rear end of the first profiling plate C (601) is arranged on the lower side wall of the lower door opening (16), the rear end of the second profiling plate C (602) is connected obliquely upward to the front end of the first profiling plate C (601), the front end of the second profiling plate C (602) is connected obliquely downward to the upper end of the third profiling plate C (603), and the third profiling plate C (603) is parallel to the side wall (15) of the railway freight car; The rear end of the fourth profiling plate C (604) is arranged on the side wall (15) of the railway freight car, and the front end of the fourth profiling plate C (604) is connected to the lower end of the third profiling plate C (603); When the lower side wall of the sealing plate (14) contacts the third profiling plate C (603) to form a curved self-sealing, the second profiling plate C (602) and the side wall of the L-shaped reinforcing beam (2) on the corresponding side are parallel to each other and there is a gap between the two.

5. The lower side door of a railway freight car according to claim 1, characterized in that: The folding structure (7) comprises two folding leaves (701) and two folding seats (702) which are symmetrically arranged on the left and right sides; Each folding seat (702) comprises a rear side plate (7021), a first left side plate (7022), a first right side plate (7023), a second left side plate (7024), and a second right side plate (7025), wherein the first left side plate (7022) and the first right side plate (7023) are respectively arranged at the left and right ends of the rear side plate (7021) and are perpendicular to each other; The sum of the thickness of the rear side plate (7021) and the front-to-back length of the first left side plate (7022) or the first right side plate (7023) is equal to the front-to-back length of the contoured upper door frame (3); The second left side plate (7024) and the second right side plate (7025) are in the shape of a right-angled trapezoid, and the end surfaces where the lower bottom edges of the second left side plate (7024) and the second right side plate (7025) are located are fixedly connected to the front end surfaces of the first left side plate (7022) and the first right side plate (7023) respectively; The upper and lower widths of the second left side plate (7024) and the second right side plate (7025) are greater than the upper and lower widths of the first left side plate (7022) and the first right side plate (7023); a notch (703) is formed between the second left side plate (7024) and the first left side plate (7022), and between the second right side plate (7025) and the first right side plate (7023) and is adapted to the upper contoured door frame, and the left and right sides of the contoured upper door frame (3) are respectively located in the two notches (703); The two hinges (701) are respectively arranged on the outer surface of the door panel (1) and are located on the left and right sides of the central hat beam (13); the upper ends of the two hinges (701) are respectively located in two hinge seats (702) and are movably connected via a latch.

6. The lower side door of a railway freight car according to claim 1, characterized in that: The buckle structure (8) comprises two buckle components which are symmetrically arranged on the left and right and correspond to the two hinges (701) respectively, and each buckle component comprises a rear fixing plate (801), a left fixing plate (802) and a right fixing plate (803); The rear end of the left fixing plate (802) is arranged at the left end of the rear fixing plate (801) and the two are perpendicular to each other; the right fixing plate (803) is arranged at the right position of the middle part of the rear fixing plate (801) and the two are perpendicular to each other; the spacing between the left fixing plate (802) and the right fixing plate (803) is greater than or equal to the left-right width of the hinge (701); the hinge (701) is located between the corresponding left fixing plate (802) and the right fixing plate (803); The left fixing plate (802) is provided with a mounting through hole along its front-to-rear direction, and a semi-threaded bolt (804) is provided in the mounting through hole; A mounting groove is arranged at the front end of the upper side wall of the left fixing plate (802) and is connected to the mounting through hole. A buckle plate (806) is arranged in the mounting groove. One end of the buckle plate (806) is arranged in the mounting groove through a semi-threaded bolt (804) and can rotate freely along the semi-threaded bolt (804). A limiting groove (805) is arranged on the left side surface of the right fixing plate (803). The upper side wall of the limiting groove (805) coincides with the upper end surface of the right fixing plate (803), and the other end of the buckle plate (806) is located in the limiting groove (805).

7. A lower side door of a railway freight car according to any one of claims 1 to 6, characterized in that: The L-shaped reinforcing beam (2), the sealing plate (14), the contoured upper door frame (3), the contoured lower door frame (6), the contoured left door frame (4), and the contoured right door frame (5) are all made of Q450NQR1 high-strength weathering steel.

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