Heavy oil tank truck for narrow gauge railway

Abstract

The invention particularly relates to a heavy oil tank truck for a narrow gauge railway, and solves the problems that the existing domestic standard oil tank truck is poor in axial deformation resistance, more in weld joints at key stress positions of a traction beam lower cover plate and a sleeper beam lower cover plate, insufficient in steam heating efficiency and low in cost. The arrangement of a steam collecting joint of the heating pipe is unreasonable; and a steam inlet pipeline is connected with external heating equipment in a threaded connection manner, so that the operation is tedious. The traction and bolster connecting base plate matched with the length of the tank body is arranged at the bottom of the tank body in the axial direction, and the axial deformation resisting capacity is improved through the thickened wall thickness of the tank body; the traction beam lower cover plate is of an integrated structure, a sleeper beam web is connected to a wing plate of the traction beam lower cover plate, and weld joints at key stress positions are reduced. A steam inlet pipe of the steam heating assembly is connected with external heating equipment through a quick coupler, and an external heating groove heats a heating blind area at the bottom of the tank body and forms internal and external heating with a calandria type heater, so that the heating efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to an oil tank car, in particular to a heavy oil tank car for narrow-gauge railway. BACKGROUND

[0002] At present, the railway oil tank car for transporting viscous oil medium in China all adopts 1435mm standard gauge, and adopts the traditional bolster design, that is, the connection pad plate of the bolster and the tank body is a split structure, the tank body wall thickness is generally 10mm, the vehicle design follows the TB / T3550.2 standard, and the heating system generally adopts an 8-line pipe steam internal heating device. With the change of international market demand, more and more foreign regions need to transport viscous oil medium on narrow-gauge railway, and the existing standard-gauge tank car product needs to meet the local operation demand in structure.

[0003] The existing domestic standard oil tank car adopts 310 Z steel traction beam, the traction beam and the bolster provided thereon are connected with the tank body by a split connection pad plate, and the tank body wall thickness is only 10mm, which has poor resistance to axial deformation and cannot meet the requirement of 10,000-ton large marshalling operation under the foreign AAR standard.

[0004] The bolster lower cover plate of the domestic standard oil tank car bolster is welded on the traction beam lower cover plate of the traction beam, the bolster is used for supporting the tank body and is a main stress component, the traction beam lower cover plate and the bolster lower cover plate are a split structure and are connected by welding, there are many welds at the key stress position, and the manufacturing process is poor.

[0005] The domestic standard oil tank car generally adopts the traditional 8-line heating pipe for steam heating, which has insufficient heating efficiency for the operation demand of some foreign regions, the water collecting pipe in the heating pipe is connected with the oil discharge valve seat outside the tank body through the steam collecting joint located directly below, the steam collecting joint is arranged unreasonably, resulting in narrow welding space and difficult welding, and the steam inlet pipeline is connected with the external heating equipment by a threaded connection mode, which is complicated to operate. SUMMARY

[0006] In order to solve the technical problems of poor resistance to axial deformation of the domestic standard oil tank car, many welds at the key stress position of the traction beam lower cover plate and the bolster lower cover plate, insufficient steam heating efficiency, unreasonable arrangement of the steam collecting joint of the heating pipe, and complicated operation of the steam inlet pipeline connected with the external heating equipment by a threaded connection mode, the present application provides a heavy oil tank car for narrow-gauge railway.

[0007] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme: A heavy oil tank car for narrow-gauge railway, which is characterized in that: comprises a tank body, a traction bolster assembly, a steam heating assembly and a bogie. The tank body bottom is provided with a draw pillow connecting pad along the axial direction, and the wall thickness A of the tank body satisfies 11mm≤A≤13mm; The draw pillow assembly and the bogie are each provided with two, and the two draw pillow assemblies are separately arranged at the two ends of the tank body bottom and are respectively located on the two bogies; each draw pillow assembly comprises a draw beam and a pillow beam; the draw beam comprises an upper draw beam cover plate, a lower draw beam cover plate and an integrated impact seat; the upper draw beam cover plate is provided with two and is oppositely arranged, the planes where the two upper draw beam cover plates are located are parallel to the vertical plane passing through the central axis of the tank body, and the top portions of the two upper draw beam cover plates are all in abutment with the draw pillow connecting pad; the outer ends of the two upper draw beam cover plates are connected through the integrated impact seat, the lower draw beam cover plate comprises a main plate and wing plates separately arranged on the two sides of the main plate, and the main plate and the wing plates are integrally arranged, the top portion of the main plate is connected with the bottom portions of the two upper draw beam cover plates respectively, and the bottom portion is used for connecting with the bogie; the pillow beam comprises pillow beam webs separately arranged on the two wing plates, the inner end faces of the pillow beam webs are connected with the upper draw beam cover plates, the top portions of the pillow beam webs are adapted to the shape of the outer wall of the tank body, and the pillow beam webs are in abutment with the bottom portion of the tank body; The steam heating assembly comprises an inlet pipe, an oil drain valve seat, two outer heating grooves and two groups of tube-type heaters; the two groups of tube-type heaters are symmetrically arranged on the inner bottom of the tank body with the radial plane passing through the center of the tank body as the symmetry plane; the inlet pipe is located outside the tank body and is provided with a quick connector at the inlet for connecting with an external heating device; the two outer heating grooves are respectively arranged corresponding to the two groups of tube-type heaters and are both located on the outer bottom of the tank body, and the inlets of the outer heating grooves are connected with the outlet of the inlet pipe; Each group of tube-type heaters comprises an inlet header, a return header and heating line pipes; the outlets of the outer heating grooves are connected with the corresponding inlet headers, the inlet headers and the return headers are both arc-shaped pipes and the radii thereof are adapted to the radius of the bottom of the tank body, the inlet headers are arranged close to the end portions of the tank body, the return headers are arranged close to the center of the tank body, the heating line pipes are arranged between the two and are in communication with the two, the number of the heating line pipes is greater than or equal to 10, and the condensate outlets on the outer side walls of the two return headers are both connected with the oil drain valve seat arranged outside the tank body through an elbow.

[0008] Further, the draw beam further comprises a center plate seat and an upper center plate; The center plate seat is located between the two upper draw beam cover plates and is connected to the top portion of the main plate, the upper center plate is arranged on the bottom portion of the main plate and is connected with the center plate seat, and the upper center plate is connected with the bogie.

[0009] Further, the pillow beam further comprises a pillow beam side cover plate, a pillow beam web plate and a lifting plate; The outer end face of the pillow beam web plate comprises a vertical section at the bottom portion, an inclined section at the top portion and inclined to the tank body, and an arc-shaped transition section connecting the two; The pillow beam side cover plate comprises a first pillow beam side cover plate and a second pillow beam side cover plate, the inner side surface of the first pillow beam side cover plate is connected with the vertical section and the arc-shaped transition section, the inner side surface of the second pillow beam side cover plate is connected with the inclined section, and a process gap is arranged between the first pillow beam side cover plate and the second pillow beam side cover plate; The bottom end of the first pillow beam side cover plate is connected with the wing plate, and the top end of the second pillow beam side cover plate is used for abutting against the outer wall of the tank body; The lifting plate is provided with a lifting hole, and the lifting plate is connected with the outer side surface of the first pillow beam side cover plate and the wing plate respectively; The pillow beam rib plate is two and is arranged vertically on both sides of the pillow beam web, and is connected with the side wall of the pillow beam web and the wing plate respectively.

[0010] Further, the side ladder assembly is further included; The side ladder assembly comprises a walking plate, a handrail, a side ladder, a safety chain and a toe plate; The walking plate is two and is arranged oppositely on both sides of the top of the tank body, and a space is arranged between the inner side surfaces of the two walking plates; the tank body top is provided with a manhole and a breathing safety valve, and both are located in the space; The handrail is located at the top of the tank body and surrounds the two walking plates, and the outer side surface of the walking plate is connected with the handrail; The side ladder is two and is connected with the two sides of the tank body respectively, the top ends of the two side ladders correspond to the outer side of the two walking plates respectively, and the handrail is provided with a notch at the top end position of the side ladder, and the safety chain is arranged at the notch position; The toe plate is arranged between the outer side surface of the walking plate and the corresponding handrail and between the two end surfaces of the walking plate and the corresponding handrail.

[0011] Further, the passing walking plate, the end side beam and the footrest are further included; The passing walking plate is arranged on the top of the traction beam upper cover plate of one of the traction beams, and is arranged close to the outer end of the traction beam upper cover plate, the passing walking plate and the traction beam upper cover plate are connected through the traction beam web, and the length direction of the passing walking plate is perpendicular to the length direction of the traction beam upper cover plate; the outer side surface of the passing walking plate is provided with a protective fence; The two ends of the passing walking plate are connected with the wing plate through the end side beam respectively, the footrest is two and is arranged corresponding to the two ends of the passing walking plate respectively, and the footrest is installed on the corresponding end side beam.

[0012] Further, the side protection frame is further included; The side protection frame is arranged on both sides of the bottom of the tank body respectively, and comprises a cross beam and a plurality of supports arranged on the cross beam in the axial direction of the tank body; the two ends of the cross beam are connected with the two bogies respectively, one end of the support is connected with the cross beam, and the other end abuts against the tank body.

[0013] Further, the outlet of the outer heating groove is connected with the middle part of the corresponding steam inlet header through the steam inlet pipe heating line pipe, the number of the heating line pipes of each group of the row pipe type heater is 10, and the heating line pipes are symmetrically arranged on both sides of the steam inlet pipe heating line pipe.

[0014] Further, the wall thickness A of the tank body is 12 mm.

[0015] Further, the bogie adopts a 20t axle load 1067mm narrow track low power bogie.

[0016] The beneficial effects of the present application are as follows: (1) The heavy oil tank car for narrow track railway provided by the present application comprises a tank body, a traction bolster assembly, a steam heating assembly and a bogie, a bolster connecting pad matched with the length of the tank body is arranged on the bottom of the tank body in the axial direction, and the wall thickness A of the tank body satisfies 11mm≤A≤13mm, the axial deformation resistance of the whole tank body is strengthened through the through-length bolster connecting pad and the thickened tank body wall thickness, and the foreign AAR standard is met; the lower cover plate of the traction beam of the traction beam adopts an integrated structure, comprising a main plate and wing plates separately arranged on both sides of the main plate, and the bolster web plate is connected to the wing plates, so that the original bolster lower cover plate and the traction beam lower cover plate are combined into one, and the welds at the key stress position are reduced; the steam inlet pipe of the steam heating assembly is connected with the external heating equipment through a quick connector, the connection operation is simple, and the heating dead zone at the bottom of the tank body is heated through the outer heating groove, and the internal and external heating is formed together with the row pipe type heater in the tank body, so that the heating efficiency is improved; the condensate water outlet of the water return header is arranged on the outer side wall thereof, and is connected with the oil drain valve seat through an elbow, so that the welding space is sufficient, and the welding operation and non-destructive testing are facilitated.

[0017] (2) The heavy oil tank car for narrow track railway provided by the present application divides the bolster side cover plate into two parts, because of the machining error of the tank body and the bolster, after the tank body is placed on the bolster web plate, the top end face of the bolster side cover plate needs to be ground according to the error, and then welded after grinding, if the grinding is excessive, the overall welding processability will be poor, but the bolster side cover plate is divided into a first bolster side cover plate and a second bolster side cover plate, the first bolster side cover plate is welded first, and only the top end face of the second bolster side cover plate needs to be ground, the process gap between the first bolster side cover plate and the second bolster side cover plate compensates for the grinding error, so that the processability is good, and the installation is convenient.

[0018] (3) The heavy oil tank car for narrow track railway provided by the present application is also provided with a side ladder assembly, the side ladder in the side ladder assembly can be used to climb to the top of the tank body to check the manhole and the breathing safety valve, the walk plate provides a walking platform for the workers, the railings protect the safety of the workers, and the safety chain can block the gap of the railings to further protect the safety of the workers.

[0019] (4) The heavy oil tank car for narrow-gauge railway also has side protection frames, which provide support and protection for the tank body through the side protection frames located on both sides of the tank body bottom. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic diagram of an embodiment of the heavy oil tank car for narrow-gauge railway of the present application; Figure 2 is a front view of the tank body in the embodiment of the present application; Figure 3 is a bottom view of the tank body in the embodiment of the present application; Figure 4 is a structural schematic diagram of the drawbar assembly in the embodiment of the present application; Figure 5 is a structural schematic diagram of the drawbar beam in the embodiment of the present application; Figure 6 is a structural schematic diagram of the lower cover plate of the drawbar beam in the embodiment of the present application; Figure 7 is a connection schematic diagram of the bolster beam and the wing plate in the embodiment of the present application; Figure 8 is a structural schematic diagram of the side ladder assembly in the embodiment of the present application; Figure 9 is a structural schematic diagram of the steam heating assembly in the embodiment of the present application; Figure 10 is Figure 9 a local enlarged view at A in the figure.

[0021] The reference signs are as follows: 1-tank body, 11-drawbar connecting pad plate, 12-manhole, 13-breathing safety valve; 2-drawbar assembly, 21-drawbar beam, 211-drawbar beam upper cover plate, 212-drawbar beam lower cover plate, 2121-main plate, 2122-wing plate; 213-integral impact seat, 214-center disc seat, 215-upper center disc, 216-drawbar beam web plate; 22-bolster beam, 221-bolster beam web plate, 222-first bolster beam side cover plate, 223-second bolster beam side cover plate, 224-bolster beam rib plate, 225-lifting plate; 3-steam heating assembly, 31-steam inlet pipe, 311-fast joint; 32-external heating groove, 33-steam inlet header, 34-backwater header, 35-heating line pipe, 36-oil discharge valve seat, 37-steam inlet pipe heating line pipe; 4-truck; 5-side ladder assembly, 51-walkway, 52-railing, 53-side ladder, 54-safety chain, 55-toe kick plate; 6-through walkway, 7-end side beam, 8-footrest, 9-protection fence, 10-side protection frame, 101-cross beam, 102-bracket. Detailed Implementation

[0022] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Reference Figures 1-10 The present invention provides a heavy-duty oil tanker for narrow-gauge railways, comprising a tank body 1, a traction bolster assembly 2, a steam heating assembly 3, and a bogie 4.

[0024] The structure of tank 1 is as follows Figure 2 and Figure 3 As shown, a traction connecting plate 11 is axially arranged at the bottom of the tank body 1. The length of the traction connecting plate 11 is adapted to the length of the bottom of the tank body 1. The traction connecting plate 11, which runs the entire length, enhances the structural strength of the tank body 1 and strengthens its ability to resist axial deformation. In addition, the wall thickness of the tank body 1 in this embodiment is also thickened, and its wall thickness A satisfies: 11mm≤A≤13mm. In this embodiment, it is 12mm, which can ensure strength and also save on processing costs.

[0025] A manhole 12 and a breathing safety valve 13 are provided on the top of the tank body 1. A side ladder assembly 5 is also provided for the convenience of staff during maintenance and daily work. Its structure is as follows: Figure 8 As shown, the side ladder assembly 5 includes a walkway 51, a railing 52, a side ladder 53, a safety chain 54, and a kick plate 55. There are two walkways 51 arranged opposite each other on the top sides of the tank body 1, with a gap between their inner surfaces. The manhole 12 and the breathing safety valve 13 are located within the gap.

[0026] A railing 52 is located at the top of the tank 1 and surrounds two walkways 51. The outer side of the walkways 51 is connected to the railing 52, protecting personnel working on the walkways 51. Two side ladders 53 are connected to both sides of the tank 1. The tops of the two side ladders 53 correspond to the outer sides of the two walkways 51. The railing 52 has notches at the top of the side ladders 53, and safety chains 54 are installed at these notches. Workers can climb to the top of the tank 1 using the two side ladders 53 on both sides of the tank 1. Once on the walkway, the safety chains 54 can be secured to prevent accidental falls. Toe boards 55 are installed between the outer side of the walkway 51 and the corresponding railing 52, and between the two end faces of the walkway 51 and the corresponding railing 52.

[0027] The bogie 4 is provided with two traction pillow assemblies 2, and the two traction pillow assemblies 2 are respectively arranged at two ends of the bottom of the tank body 1 and located on the two bogies 4. In order to adapt to the requirements of foreign narrow tracks, the bogie 4 adopts a 20t axle load 1067mm narrow track low power bogie.

[0028] Each traction pillow assembly 2 comprises a traction beam 21 and a pillow beam 22. The structure of the traction beam 21 is shown in Figures 4-6 The traction beam upper cover plates 211 are provided with two opposite cover plates, and the planes of the two cover plates are parallel to the vertical plane passing through the center axis of the tank body 1. The top of each cover plate is in abutment with the traction pillow connecting pad 11. The outer ends of the two traction beam upper cover plates 211 are connected through the integral impact seat 213. The structure of the traction beam lower cover plate 212 is shown in Figure 6 The main plate 2121 and the wing plates 2122 are integrally arranged. The top of the main plate 2121 is connected with the bottom of the two traction beam upper cover plates 211, and the bottom is used for connecting with the bogie 4. In order to facilitate the connection with the bogie 4, the heart disc seat 214 and the upper heart disc 215 are arranged. The heart disc seat 214 is located between the two traction beam upper cover plates 211 and connected to the top of the main plate 2121. The upper heart disc 215 is arranged at the bottom of the main plate 2121 and connected with the heart disc seat 214. The upper heart disc 215 is connected with the bogie 4.

[0029] The structure of the pillow beam 22 is shown in Figure 7 The pillow beam 22 comprises a pillow beam web plate 221, a pillow beam side cover plate, a pillow beam muscle plate 224 and a lifting plate 225. The pillow beam web plates 221 are arranged on the two wing plates. The inner end face of the pillow beam web plate 221 is connected with the traction beam upper cover plate 211. The top of the pillow beam web plate 221 is matched with the outer wall of the tank body 1, and the bottom of the pillow beam web plate 221 is in abutment with the tank body 1. The original pillow beam lower cover plate and the traction beam lower cover plate 212 are combined into one, so as to reduce the welding seam of the key stress position and improve the structural strength.

[0030] The outer end surface of the bolster web 221 includes a vertical section at the bottom, an inclined section at the top and inclined to the tank body 1, and an arc-shaped transition section connecting the two. The bolster side cover plate is divided into two parts, including a first bolster side cover plate 222 and a second bolster side cover plate 223. The inner side surface of the first bolster side cover plate 222 is connected with the vertical section and the arc-shaped transition section. The inner side surface of the second bolster side cover plate 223 is connected with the inclined section. A process gap is provided between the first bolster side cover plate 222 and the second bolster side cover plate 223. The bottom end of the first bolster side cover plate 222 is connected with the wing plate 2122. The top end of the second bolster side cover plate 223 is used to abut against the outer wall of the tank body 1. Because when assembling the tank truck, the tank body 1 is generally placed on the bolster web 221, and then the top end surface of the bolster side cover plate needs to be ground according to the error. After grinding, welding is performed. If the grinding is excessive, the overall welding process will be poor. By dividing the bolster side cover plate into the first bolster side cover plate 222 and the second bolster side cover plate 223, the first bolster side cover plate 222 is welded first, and only the top end surface of the second bolster side cover plate 223 needs to be ground. The process gap between the first bolster side cover plate 222 and the second bolster side cover plate 223 compensates for the grinding error, which is good in process and easy to install.

[0031] A lifting hole is formed in the lifting plate 225, and the lifting plate 225 is connected with the outer side surface of the first bolster side cover plate 222 and the wing plate 2122, respectively, for easy lifting by the overhead crane. The bolster rib plate 224 has two and is vertically arranged on both sides of the bolster web 221. The two are connected with the side wall of the bolster web 221 and the wing plate 2122, respectively, which can improve the structural strength of the entire bolster 22.

[0032] The steam heating assembly 3 has a structure as shown in Figure 9 and Figure 10 includes a steam inlet pipe 31, an oil drain valve seat 36, two external heating grooves 32, and two groups of tube-type heaters.

[0033] The two groups of tube-type heaters are symmetrically arranged on the inside bottom of the tank body 1 with the radial plane passing through the center of the tank body 1 as the symmetry plane. The steam inlet pipe 31 is located outside the tank body 1 and has an inlet provided with a quick connector 311 for connecting with external heating equipment. Compared with the traditional threaded connection, the operation is simple. The two external heating grooves 32 are arranged corresponding to the two groups of tube-type heaters and are located on the outside bottom of the tank body 1. The inlet of the external heating groove 32 is connected with the outlet of the steam inlet pipe 31, Each group of the tube heater comprises a steam inlet header 33, a water return header 34 and heating coils 35, the outlet of the outer heating tank 32 is connected to the middle of the corresponding steam inlet header 33 through the steam inlet coil 37, the steam inlet header 33 and the water return header 34 are both arc-shaped pipes and the curvature is matched with the curvature of the bottom of the tank body 1, the steam inlet header 33 is arranged close to the end of the tank body 1, the water return header 34 is arranged close to the center of the tank body 1, the heating coils 35 are arranged between the two and communicate with the two, the number of the heating coils 35 is greater than or equal to 10, and the condensate outlets of the two water return headers 34 are arranged on the outer side wall thereof and are connected to the oil discharge valve seat 36 arranged on the outer side of the tank body 1. In the embodiment, the number of the heating coils 35 of each group of the tube heater is 10 and is symmetrically arranged on both sides of the steam inlet coil 37. The tube heater and the outer heating tank 32 form inner and outer heating, and the heating dead zone at the bottom of the tank body 1 is heated through the outer heating tank 32, thereby improving the heating efficiency. The condensate outlets of the two water return headers 34 are both arranged on the outer side wall thereof and are connected to the oil discharge valve seat 36 through an elbow, so that the welding space is sufficient and the welding operation and non-destructive testing are facilitated.

[0034] In order to provide more support for the tank body 1, a side protection frame 10 is further arranged, the side protection frame 10 is arranged on both sides of the bottom of the tank body 1 and comprises a cross beam 101 and a plurality of supports 102 arranged on the cross beam 101 in the axial direction of the tank body 1, the two ends of the cross beam 101 are respectively connected to the two bogies 4, one end of the support 102 is connected to the cross beam 101 and the other end is in abutment with the tank body 1. That is, the tank body 1 can be provided with support and protection.

[0035] In order to facilitate the staff to check the traction yoke assembly 2 and the bogie 4, a walkway 6, an end side beam 7 and a footrest 8 are further arranged. As shown in Figure 4 the walkway 6 is arranged on the top of the traction beam upper cover plate 211 of one of the traction beams 21 and close to the outer end of the traction beam upper cover plate 211, and the length direction of the walkway 6 is perpendicular to the length direction of the traction beam upper cover plate 211. The walkway 6 is connected to the traction beam upper cover plate 211 through the traction beam web plate 216 and a guardrail 9 is arranged on the outer side of the walkway 6. The two ends of the walkway 6 are respectively connected to the end side beam 7 and the wing plate 2122, and the footrest 8 has two and is respectively arranged at the two ends of the walkway 6 and is installed on the corresponding end side beam 7. The staff can climb onto the walkway 6 through the footrest 8 to work, and the guardrail 9 can prevent the staff from falling accidentally during the work.

[0036] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this, any change or replacement within the technical scope disclosed in the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A heavy-duty oil tanker car for narrow-gauge railways, characterized in that: It includes a tank body (1), a bolster assembly (2), a steam heating assembly (3), and a bogie (4); The bottom of the tank (1) is provided with a traction connecting pad (11) that is adapted to the length of the bottom of the tank (1) along the axial direction, and the wall thickness A of the tank (1) satisfies: 11mm≤A≤13mm; Two traction bolster assemblies (2) and two bogies (4) are provided. The two traction bolster assemblies (2) are respectively located at both ends of the bottom of the tank body (1) and on the two bogies (4). Each traction bolster assembly (2) includes a traction beam (21) and a bolster beam (22). The traction beam (21) includes a traction beam upper cover plate (211), a traction beam lower cover plate (212), and an integrated impact seat (213). There are two traction beam upper cover plates (211) arranged opposite to each other. The plane on which the two are located is parallel to the vertical plane passing through the central axis of the tank body (1), and the top of both abuts against the traction bolster connecting pad (11). The outer ends of the two traction beam upper cover plates (211) are connected by the integrated impact seat (213). Next, the lower cover plate (212) of the traction beam includes a main plate (2121) and wing plates (2122) respectively disposed on both sides of the main plate (2121). The main plate (2121) and the wing plates (2122) are integrally disposed. The top of the main plate (2121) is connected to the bottom of the two upper cover plates (211) of the traction beam respectively, and the bottom is used to connect with the bogie (4). The bolster beam (22) includes a bolster beam web plate (221) disposed on the two wing plates (2122). The inner end face of the bolster beam web plate (221) is connected to the upper cover plate (211) of the traction beam. The top shape of the bolster beam web plate (221) is adapted to the outer wall of the tank (1), and the bolster beam web plate (221) abuts against the bottom of the tank (1). The steam heating assembly (3) includes a steam inlet pipe (31), an oil drain valve seat (36), two external heating tanks (32), and two sets of pipe-type heaters. The two sets of pipe-type heaters are symmetrically arranged on the inner bottom of the tank (1) with the radial plane passing through the center of the tank (1) as the symmetrical plane. The steam inlet pipe (31) is located outside the tank (1) and its inlet is provided with a quick-connect fitting (311) for connecting with external heating equipment. The two external heating tanks (32) are respectively arranged corresponding to the two sets of pipe-type heaters and are both located on the outer bottom of the tank (1). The inlet of the external heating tank (32) is connected to the outlet of the steam inlet pipe (31). Each set of pipe heaters includes a steam inlet manifold (33), a return water manifold (34), and a heating wire (35); the outlet of the external heating tank (32) is connected to the corresponding steam inlet manifold (33). Both the steam inlet manifold (33) and the return water manifold (34) are arc-shaped pipes and their curvature is adapted to the curvature of the bottom of the tank (1). The steam inlet manifold (33) is set near the end of the tank (1), and the return water manifold (34) is set near the center of the tank (1). The heating wire (35) is set between the two and connected to both. The number of heating wires (35) is ≥10. The condensate outlets on the outer walls of the two return water manifolds (34) are connected to the oil drain valve seat (36) set on the outside of the tank (1) through elbows.

2. The heavy-duty oil tanker car for narrow-gauge railways according to claim 1, characterized in that: The traction beam (21) also includes a center plate seat (214) and an upper center plate (215); The center plate seat (214) is located between the two traction beam upper cover plates (211) and connected to the top of the main board (2121). The upper center plate (215) is located at the bottom of the main board (2121) and connected to the center plate seat (214). The upper center plate (215) is connected to the bogie (4).

3. The heavy-duty oil tanker car for narrow-gauge railways according to claim 2, characterized in that: The bolster beam (22) also includes a bolster beam side cover plate, a bolster beam stiffening plate (224), and a lifting plate (225); The outer end face of the web of the pillow beam (221) includes a vertical section at the bottom, an inclined section at the top that is inclined toward the tank (1), and an arc-shaped transition section connecting the two. The bolster side cover plate includes a first bolster side cover plate (222) and a second bolster side cover plate (223). The inner side of the first bolster side cover plate (222) is connected to the vertical section and the arc transition section, and the inner side of the second bolster side cover plate (223) is connected to the inclined section. A process gap is provided between the first bolster side cover plate (222) and the second bolster side cover plate (223). The bottom end of the first bolster beam side cover plate (222) is connected to the wing plate (2122), and the top end of the second bolster beam side cover plate (223) is used to abut against the outer wall of the tank body (1); The lifting plate (225) is provided with lifting holes, and the lifting plate (225) is connected to the outer side of the first bolster beam side cover plate (222) and the wing plate (2122) respectively; There are two stiffening plates (224) on the pillow beam web (221) respectively, which are perpendicularly arranged on both sides of the pillow beam web (221). The two stiffening plates are connected to the side wall of the pillow beam web (221) and the wing plate (2122) respectively.

4. The heavy-duty oil tanker car for narrow-gauge railways according to claim 3, characterized in that: It also includes the side ladder assembly (5); The side ladder assembly (5) includes a walkway (51), a railing (52), a side ladder (53), a safety chain (54), and a kickboard (55); There are two walkways (51) arranged opposite each other on the top sides of the tank (1), with a gap between their inner sides; a manhole (12) and a breathing safety valve (13) are provided on the top of the tank (1), both located within the gap; The railing (52) is located on the top of the tank (1) and is arranged around the two walkways (51). The outer side of the walkways (51) is connected to the railing (52). There are two side ladders (53) and they are respectively connected to the two sides of the tank (1). The top of the two side ladders (53) are respectively set on the outside of the two walkways (51), and the railing (52) has a notch at the top of the side ladder (53). The safety chain (54) is set at the notch. The kickboard (55) is set between the outer side of the walkway (51) and the corresponding railing (52) and between the two end faces of the walkway (51) and the corresponding railing (52).

5. The heavy-duty oil tanker car for narrow-gauge railways according to claim 4, characterized in that: It also includes a walkway (6), end beams (7) and foot pedals (8); The walkway (6) is set on the top of the traction beam cover plate (211) of one of the traction beams (21) and is set near the outer end of the traction beam cover plate (211). The walkway (6) is connected to the traction beam cover plate (211) through the web plate (216) of the traction beam, and the length direction of the walkway (6) is perpendicular to the length direction of the traction beam cover plate (211). A guardrail (9) is provided on the outer side of the walkway (6). The two ends of the walkway (6) are connected to the wing plate (2122) via the end side beam (7). There are two foot pedals (8), which are respectively set at the two ends of the walkway (6) and the foot pedals (8) are installed on the corresponding end side beam (7).

6. The heavy-duty oil tanker car for narrow-gauge railways according to claim 5, characterized in that: It also includes side guardrails (10); The side protective frame (10) is respectively installed on both sides of the bottom of the tank (1), including a crossbeam (101) and multiple supports (102) installed on the crossbeam (101) along the axial direction of the tank (1); the two ends of the crossbeam (101) are respectively connected to two bogies (4), one end of the support (102) is connected to the crossbeam (101), and the other end abuts against the tank (1).

7. The heavy-duty oil tanker car for narrow-gauge railways according to claim 1, characterized in that: The outlet of the external heating tank (32) is connected to the middle of the corresponding steam inlet manifold (33) through the steam inlet pipe heating line (37). The number of heating lines (35) of each group of pipe heaters is 10, and they are symmetrically arranged on both sides of the steam inlet pipe heating line (37).

8. The heavy-duty oil tanker car for narrow-gauge railways according to claim 1, characterized in that: The wall thickness A of the tank (1) is 12mm.

9. The heavy-duty oil tanker car for narrow-gauge railways according to claim 1, characterized in that: The bogie (4) is a 20t axle load 1067mm narrow rail low power bogie.

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