Powder and particle material transportation railway tank car adopting gravity type pneumatic unloading mode

Abstract

The utility model relates to a powder and particle material transportation railway tank car, in particular to a powder and particle material transportation railway tank car adopting a gravity type pneumatic unloading mode, and solves the technical problems that the existing railway tank car is difficult to unload low-density powder and particle materials, or the existing gravity type pneumatic unloading mode is not suitable for the railway tank car. A gravity type pneumatic unloading mode is adopted, the funnel type fluidizing device is used for replacing a fluidized bed arranged in the tank body, the funnel type fluidizing device can be directly and integrally disassembled for overhauling or replacing during overhauling, the overhauling efficiency is improved, the effective volume of the tank body is increased, the vehicle load is improved, unloading of low-density powder and particle materials can be achieved, and the energy consumption is reduced. And meanwhile, high-density powdery materials can be transported in a compatible mode.

Description

Technical Field

[0001] This utility model relates to railway tank cars for transporting powdery materials, specifically to a railway tank car for transporting powdery materials using a gravity-type pneumatic unloading method. Background Technology

[0002] In my country, bulk materials transported by railway mainly consist of coal, ore, and liquids, with the main equipment being 70t and 80t open wagons and 70t tank cars. Equipment for transporting granular bulk materials primarily includes bulk cement tank cars, alumina powder tank cars, and grain transport cars, but there is a lack of equipment for transporting low-density materials such as resins, plastics, and urea. Currently, railway tank cars for cement and alumina powder mainly employ fluidized bed pneumatic unloading. The principle is to arrange large fluidizing devices inside the tank. During unloading, pressure is applied to the tank to fluidize the material at the bottom, and then pressure draws the medium from the tank into the unloading pipe, from which it is discharged. The disadvantages of this unloading method are:

[0003] First, arranging fluidizing devices inside the tank occupies tank volume, reducing the load capacity of the tank truck and resulting in poor transportation economy. Second, large fluidizing devices are heavy and occupy the effective load capacity of the tank truck, further limiting the economic efficiency of tank truck transportation. Third, the fluidizing devices installed inside the tank require personnel to enter the tank for maintenance or parts replacement, making operations inconvenient. Fourth, fluidized pneumatic unloading methods are generally only suitable for unloading high-density powdery materials, and are more difficult to unload low-density granular materials.

[0004] Gravity-pneumatic unloading can unload not only high-density powder materials but also low-density granular materials. However, existing gravity-pneumatic unloading methods mainly rely on air compressors installed on the vehicles to pressurize the tanks. Since railway tank cars do not have a power source, the method of pressurizing the tanks with air compressors is not applicable to railway tank cars. Utility Model Content

[0005] The purpose of this invention is to solve the technical problems that existing railway tank cars are difficult to unload low-density powder materials, or that existing gravity-pneumatic unloading methods are not applicable to railway tank cars, and to provide a railway tank car for transporting powder materials using a gravity-pneumatic unloading method.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A railway tank car for transporting powdery materials using a gravity-type pneumatic unloading method includes a tank body; an end ladder is installed at one end of the tank body, a walkway connected to the end ladder is installed at the top, and a base frame is installed at the bottom; a coupler buffer device is installed at each of the two ends of the base frame, and a bogie is installed below each of the two ends.

[0008] Its special feature is that it also includes a gravity-type pneumatic unloading device installed at the bottom of the tank;

[0009] The top of the tank is provided with a manhole for feeding, and the bottom is provided with 2N discharge ports evenly distributed, where N is an integer and 1≤N≤5;

[0010] The gravity-type pneumatic unloading device includes 2N funnel-type fluidizing devices, two blowing aid pipelines, two unloading pipelines, one air inlet pipeline, 2N main air inlet pipelines, and one exhaust pipeline.

[0011] The two unloading pipelines are arranged sequentially at the bottom of the tank along the length of the tank. Each unloading pipeline has N inlets, one end of which serves as an outlet for connection to the unloading port, and the other end as an air inlet.

[0012] The feed ends of the 2N funnel-type fluidizing devices are respectively connected to the 2N discharge ports, and their discharge ends are respectively connected to the inlets of the corresponding unloading pipelines;

[0013] The air inlet pipe is arranged along the length of the tank and has 2N air outlets. It also has an air inlet for connecting to an air source and an auxiliary blowing port at each end. Each air outlet is connected to the air inlet end of a main air inlet pipe. The air outlet end of the main air inlet pipe is located below the funnel-shaped fluidizing device and is used to blow air into the funnel-shaped fluidizing device to assist in unloading during unloading. Each auxiliary blowing port is connected to the air inlet end of an auxiliary blowing pipe. The air outlet ends of the two auxiliary blowing pipes are respectively connected to the two unloading pipes 33 and their outlet ends opposite to them, and are used to blow air into the unloading pipes to assist in unloading during unloading.

[0014] The exhaust pipe is located at the top of the tank, with its inlet end inside the tank and its outlet end outside the tank.

[0015] Furthermore, the tank body includes a cylindrical body, a traction connecting plate, and a tank body pad;

[0016] The top of the cylindrical body has a manhole, and the bottom has 2N discharge ports evenly distributed. Both ends are connected to the bottom of a large inclined conical body, and the top of the two large inclined conical bodies are respectively provided with a matching end cap.

[0017] The traction bolster connecting plate is set at the bottom of the cylindrical body along the length direction. The two ends of the traction bolster connecting plate are respectively installed on the conical surfaces of the two large-angle conical bodies, and the lower part is connected to the upper plane of the base frame.

[0018] The tank body pad is positioned between the traction connecting plate and the cylindrical body and the two steeply tapered bodies.

[0019] Furthermore, the base frame includes a longitudinal beam mechanism and two traction mechanisms respectively disposed at both ends of the longitudinal beam mechanism;

[0020] The longitudinal beam mechanism includes two parallel longitudinal beams, which are located on both sides of the gravity-type pneumatic unloading device.

[0021] The traction mechanism includes a bolster beam vertically mounted on two longitudinal beams, as well as a traction beam, an end beam, and two side beams;

[0022] The traction beam is mounted on the bogie, with a coupler buffer device installed below it. Both ends are connected to the bolster beam and the end beam, forming an I-shaped structure.

[0023] Each of the side beams is connected to one end of the sleeper beam and the corresponding end of the end beam at both ends;

[0024] The traction beam, bolster beam, and longitudinal beam are respectively connected to the traction bolster connecting plate.

[0025] Furthermore, a discharge mechanism is provided between each discharge port at the bottom of the cylindrical body and the funnel-type fluidizing device;

[0026] The discharge mechanism includes two arc-shaped sliding plates and two triangular supplementary plates. The arc-shaped sliding plates and triangular supplementary plates are alternately arranged and connected in sequence to form a closed whole. The upper opening of the closed whole is connected to the discharge port, and the lower opening is connected to the feed end of the funnel-type fluidizing device.

[0027] The arc-shaped sliding plate is set at an acute angle to the transverse cross-section of the cylindrical body.

[0028] Furthermore, the funnel-shaped fluidizing device includes a funnel-shaped small end cap outer wall; the upper end of the funnel-shaped small end cap outer wall serves as the feed inlet of the funnel-shaped fluidizing device and is connected to the discharge outlet, and the lower end serves as the discharge outlet of the funnel-shaped fluidizing device and is connected to the corresponding inlet on the unloading pipeline; a perforated plate adapted to it is provided inside; the perforated plate is covered with a breathable canvas, and multiple pressure strips are arranged on the breathable canvas along the radial direction of the funnel-shaped small end cap outer wall, and the multiple pressure strips are evenly arranged on the circumference of the funnel-shaped small end cap outer wall.

[0029] Furthermore, a butterfly valve is installed between the lower end of the outer wall of the funnel-shaped small end cap and the unloading pipeline.

[0030] Furthermore, a safety valve and a pressure gauge are installed on the intake pipe.

[0031] Furthermore, the discharge ends of the two discharge pipelines are connected to the discharge outlet via a tee.

[0032] Furthermore, N = 3.

[0033] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0034] 1. This utility model provides a railway tank car for transporting powdery materials using a gravity-pneumatic unloading method. The gravity-pneumatic unloading method can realize the unloading of low-density powdery materials, solving the railway transportation needs of low-density granular materials, and can also be compatible with the transportation of high-density powdery materials.

[0035] 2. This utility model provides a railway tank car for transporting powder and granular materials using a gravity-type pneumatic unloading method. The gravity-type pneumatic unloading device uses a funnel-type fluidization device to replace the fluidized bed set inside the tank body. During maintenance, it can be directly disassembled as a whole for maintenance or replacement, which improves maintenance efficiency and increases the effective volume of the tank body, thereby increasing the vehicle's load capacity.

[0036] 3. The present invention provides a railway tank car for transporting powder and granular materials using a gravity pneumatic unloading method. It utilizes an external air source to supply gas to the gravity pneumatic unloading device. Compared with the method of pressurizing with an air compressor, it reduces the vehicle's weight, further increases the vehicle's load capacity, and improves the transportation economy.

[0037] 4. The present invention provides a railway tank car for transporting powder and granular materials using a gravity-type pneumatic unloading method. The tank body is provided with a large-angle conical tank body on both sides, which helps the material to slide downward and be unloaded by gravity.

[0038] 5. The present invention provides a railway tank car for transporting powder and granular materials using a gravity-type pneumatic unloading method. The underframe is made of two longitudinal beams connected to the traction mechanism, making it a whole and meeting the stress requirements for vehicle operation. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0040] Figure 2 This is a schematic diagram of the tank structure in an embodiment of the present utility model;

[0041] Figure 3 This is a perspective view of the tank in an embodiment of the present utility model;

[0042] Figure 4 This is a schematic diagram of the base frame in an embodiment of the present utility model;

[0043] Figure 5 This is a schematic diagram of the gravity-type pneumatic unloading device in an embodiment of this utility model;

[0044] Figure 6 for Figure 5 A bottom view;

[0045] Figure 7 This is a perspective view of the gravity-type pneumatic unloading device in the embodiment of this utility model;

[0046] Figure 8 This is a schematic diagram of the funnel-type fluidization device in an embodiment of the present invention;

[0047] The annotations in the attached figures are explained as follows:

[0048] 1-Tank body, 2-Base frame, 3-Gravity pneumatic unloading device, 4-End ladder, 5-Walkway, 6-Coupled buffer device, 7-Bogie;

[0049] 11-Cylindrical body, 12-Surveillance conical body, 13-End cap, 14-Manhole, 15-Pillow connecting plate, 16-Tank pad, 17-Discharge mechanism, 18-Arc-shaped sliding plate, 19-Triangular patch plate;

[0050] 21-Longitudinal beam, 22-Sleeper beam, 23-Traction beam, 24-End beam, 25-Side beam;

[0051] 31-Funnel-type fluidization device, 32-Blowing aid pipeline, 33-Discharge pipeline, 34-Inlet pipeline, 35-Main inlet pipeline, 36-Outer wall of funnel-type small end cap, 37-Perforated plate, 38-Breathable canvas, 39-Pressure strip, 310-Safety valve, 311-Pressure gauge, 312-Tee. Detailed Implementation

[0052] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a railway tank car for transporting powder and granular materials using a gravity-pneumatic unloading method, according to this utility model. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of this utility model and are not intended to limit the scope of protection of this utility model.

[0053] A railway tank car for transporting powdery materials using gravity-pneumatic unloading, such as Figure 1 As shown, the tank includes a tank body 1. An end ladder 4 is installed at one end of the tank body 1, a walkway 5 connected to the end ladder 4 is installed at the top, and a base frame 2 and a gravity-type pneumatic unloading device 3 are installed at the bottom. A coupler buffer device 6 is installed at each end of the base frame 2, and a bogie 7 is installed below it.

[0054] like Figure 2As shown, the tank body 1 includes a cylindrical body 11, a traction connecting plate 15, and a tank body pad 16. The top of the cylindrical body 11 has a manhole 14, and the bottom has 2N evenly spaced discharge ports. Both ends are connected to the bottom of a large-angle conical body 12, and each of the two large-angle conical bodies 12 has a matching end cap 13 at its top. The traction connecting plate 15 is positioned along the length of the bottom of the cylindrical body 11, with both ends mounted on the conical surfaces of the two large-angle conical bodies 12, and its lower part connected to the upper plane of the base frame 2. The tank body 1 and the base frame 2 are fixedly connected by welding via the traction connecting plate 12. The tank body pad 16 is positioned between the traction connecting plate 15 and the cylindrical body 11 and the two large-angle conical bodies 12.

[0055] Each discharge port at the bottom of the cylindrical body 11 is connected to a discharge mechanism 17, such as... Figure 3 As shown, the discharge mechanism 17 includes two arc-shaped slide plates 18 and two triangular supplementary plates 19. The arc-shaped slide plates 18 and triangular supplementary plates 19 are alternately arranged and connected in sequence to form a closed whole. The upper opening of the closed whole is connected to the discharge port, and the lower opening is connected to the feed end of the funnel-type fluidizing device 31. The arc-shaped slide plates 18 are set at an acute angle to the transverse section of the cylindrical body 11, and the triangular supplementary plates 19 are arranged on the side of the cylindrical body 11 to eliminate the material accumulation area inside the cylindrical body 11.

[0056] like Figure 4 As shown, the underframe 2 includes a longitudinal beam mechanism and two bolster mechanisms respectively located at both ends of the longitudinal beam mechanism. The longitudinal beam mechanism includes two parallel longitudinal beams 21, which are located on both sides of the gravity-type pneumatic unloading device 3. The bolster mechanism includes bolster beams 22 vertically mounted on the two longitudinal beams 21, as well as a traction beam 23, an end beam 24, and two side beams 25. The traction beam 23 is mounted on the bogie 7, with a coupler buffer device 6 located below it. Its two ends are connected to the bolster beam 22 and the end beam 24 respectively, forming an I-beam structure. Each side beam 25 is connected to one end of the bolster beam 22 and the corresponding end of the end beam 24. The traction beam 23, bolster beam 22, and longitudinal beam 21 are connected to the bolster connecting plate 15.

[0057] like Figure 5 , Figure 6 , Figure 7As shown, the gravity-type pneumatic unloading device 3 includes six funnel-shaped fluidizing devices 31, two auxiliary blowing pipes 32, two unloading pipes 33, one air inlet pipe 34, six main air inlet pipes 35, and one exhaust pipe. The two unloading pipes 33 are sequentially arranged at the bottom of the tank 1 along its length. Each unloading pipe 33 has three inlets, one end of which serves as an outlet for connection to the unloading port, and the other end as an air inlet. The inlet ends of the six funnel-shaped fluidizing devices 31 are connected to the six discharge mechanisms 17 via flanges and bolts, and their outlet ends are connected to the inlets of the corresponding unloading pipes 33. The outlet ends of the two unloading pipes 33 are connected to the unloading port via tees 312. A butterfly valve is installed between the lower end of the funnel-shaped fluidizing device 31 and the unloading pipe 33. An air inlet pipe 34 is installed along the length of the tank body 1, with six air outlets and an air inlet for connecting to an air source. An auxiliary blowing port is located at each end. Each air outlet is connected to the inlet end of a main air inlet pipe 35, whose outlet is located below the funnel-shaped fluidizing device 31, used to blow air into the funnel-shaped fluidizing device 31 to assist in unloading. Each auxiliary blowing port is connected to the inlet end of an auxiliary blowing pipe 32 via a ball valve. The outlet ends of the two auxiliary blowing pipes 32 are respectively connected to the opposite ends of two unloading pipes 33, used to blow air into the unloading pipes 33 to assist in unloading. An exhaust pipe is located at the top of the tank body 1, with its inlet end inside the tank body 1 and its outlet end outside the tank body 1. A safety valve 310 and a pressure gauge 311 are installed on the air inlet pipe 34.

[0058] like Figure 8 As shown, the funnel-type fluidizing device 31 includes a funnel-shaped small end cap outer wall 36. The upper end of the funnel-shaped small end cap outer wall 36 serves as the feed inlet of the funnel-type fluidizing device 31 and is connected to the discharge outlet, while the lower end serves as the discharge outlet of the funnel-type fluidizing device and is connected to the corresponding inlet on the discharge pipeline 33. A perforated plate 37 adapted to this plate is provided inside. A breathable canvas 38 covers the perforated plate 37, and multiple pressure strips 39 are radially arranged on the breathable canvas 38 along the outer wall 36 of the funnel-shaped small end cap. The multiple pressure strips 39 are evenly arranged on the circumference of the outer wall 36 of the funnel-shaped small end cap.

[0059] The working principle of a railway tank car for transporting powdery materials using a gravity-type pneumatic unloading method, as provided in this embodiment, is as follows:

[0060] Material is loaded into tank 1 through manhole 14. When unloading is required upon arrival at the destination, the air inlet of air inlet pipe 34 is connected to an air source, and the unloading port of ground unloading pipe is connected to the discharge end of unloading pipe 33. When unloading begins, pressure is first applied to the tank 1 through the air inlet pipe 34. When the pressure reaches the unloading pressure, the butterfly valves between the six funnel-type fluidizing devices 31 and the unloading pipe 33, as well as the ball valves between the air inlet pipe 34 and the blowing pipe 32, are opened. The powdery material gathers at the bottom of the funnel-type fluidizing device 31 by gravity. The airflow enters the funnel cavity formed by the perforated plate 37 and the outer wall 36 of the funnel-type small end cap through the air inlet pipe 34, and then enters the material layer through the breathable canvas 38 to fluidize the material. Due to the pressure difference between the inside and outside of the tank 1, the fluidized material enters the unloading pipe 33. At the same time, the blowing pipe 32 blows air into the funnel-type fluidizing device 31. Under the combined action of the air pressure in the air inlet pipe 34 and the airflow in the blowing pipe 32, the powdery material is unloaded from the vehicle through the discharge end of the unloading pipe 33.

[0061] When it is necessary to open the manhole 14 for maintenance, first open the exhaust pipe 35 to vent the air. After the air pressure inside the tank 1 is balanced with the atmospheric pressure, the manhole 14 can be opened to enter the tank 1. When it is necessary to repair the funnel-type fluidizing device 31, the bolts between the funnel-type fluidizing device 31 and the discharge mechanism 17 at the bottom of the tank 1 can be loosened, and then the butterfly valve between the funnel-type fluidizing device 31 and the discharge pipe 33 can be loosened. The funnel-type fluidizing device 31 can then be removed for repair or replacement.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this utility model.

Claims

1. A railway tank car for transporting powdered materials using a gravity-type pneumatic unloading method, comprising a tank body (1); an end ladder (4) is installed at one end of the tank body (1), a walkway (5) connected to the end ladder (4) is installed at the top, and a base frame (2) is installed at the bottom; a coupler buffer device (6) is installed at each of the two ends of the base frame (2), and a bogie (7) is installed below each of the two ends; Its features are: It also includes a gravity-type pneumatic unloading device (3) installed at the bottom of the tank (1); The top of the tank (1) is provided with a manhole (14) for feeding, and the bottom is provided with 2N discharge ports evenly distributed, where N is an integer and 1≤N≤5; The gravity-type pneumatic unloading device (3) includes 2N funnel-type fluidizing devices (31), two blowing aid pipelines (32), two unloading pipelines (33), one air inlet pipeline (34), 2N main air inlet pipelines (35), and one exhaust pipeline. Two discharge pipes (33) are arranged sequentially at the bottom of the tank (1) along the length of the tank (1). Each discharge pipe (33) has N inlets, one end of which serves as an outlet for connection to the discharge port, and the other end serves as an air inlet. The feed ends of 2N funnel-type fluidizing devices (31) are respectively connected to 2N discharge ports, and the discharge ends are respectively connected to the inlets on the corresponding discharge pipes (33). The air inlet pipe (34) is arranged along the length of the tank (1), and has 2N air outlets and an air inlet for connecting to the air source. Each end has an auxiliary blowing port. Each air outlet is connected to the air inlet end of a main air inlet pipe (35). The air outlet end of the main air inlet pipe (35) is located below the side of the funnel-type fluidizing device (31) and is used to blow air into the funnel-type fluidizing device (31) to assist in unloading. Each auxiliary blowing port is connected to the air inlet end of an auxiliary blowing pipe (32). The air outlet ends of the two auxiliary blowing pipes (32) are respectively connected to the air inlets of the two unloading pipes (33) and are used to blow air into the unloading pipes (33) to assist in unloading. The exhaust pipe is located at the top of the tank (1), with its inlet end inside the tank (1) and its outlet end outside the tank (1).

2. A railway tank car for transporting powdery materials using a gravity-pneumatic unloading method as described in claim 1, characterized in that: The tank body (1) includes a cylindrical body (11), a traction connecting plate (15), and a tank body pad (16); The top of the cylindrical body (11) has a manhole (14), and the bottom has 2N discharge ports evenly distributed. The two ends are respectively connected to the bottom of a large inclined conical body (12). The top of the two large inclined conical bodies (12) are respectively provided with a matching end cap (13). The traction connecting plate (15) is set at the bottom of the cylindrical body (11) along the length direction, and its two ends are respectively installed on the conical surfaces of two large-angle conical bodies (12), and its lower part is connected to the upper plane of the base frame (2); The tank body pad (16) is positioned between the traction connecting plate (15) and the cylindrical body (11) and the two large-angle conical bodies (12).

3. A railway tank car for transporting powdery materials using a gravity-pneumatic unloading method as described in claim 2, characterized in that: The base frame (2) includes a longitudinal beam mechanism and two traction mechanisms respectively disposed at both ends of the longitudinal beam mechanism; The longitudinal beam mechanism includes two parallel longitudinal beams (21), and the two longitudinal beams (21) are located on both sides of the gravity pneumatic unloading device (3); The traction mechanism includes a pillow beam (22) vertically arranged on two longitudinal beams (21), as well as a traction beam (23), an end beam (24) and two side beams (25); The traction beam (23) is mounted on the bogie (7), and a coupler buffer device (6) is mounted below it. The two ends are connected to the bolster beam (22) and the end beam (24) respectively, forming an I-shaped structure. Each of the side beams (25) is connected at one end of the pillow beam (22) and the corresponding end of the end beam (24) at both ends; The traction beam (23), the bolster beam (22) and the longitudinal beam (21) are respectively connected to the traction bolster connecting plate (15).

4. A railway tank car for transporting powder and granular materials using a gravity-type pneumatic unloading method as described in claim 3, characterized in that: A discharge mechanism (17) is provided between each discharge port at the bottom of the cylindrical body (11) and the funnel-type fluidizing device (31); The discharge mechanism (17) includes two arc-shaped slide plates (18) and two triangular plates (19). The arc-shaped slide plates (18) and triangular plates (19) are alternately arranged and connected in sequence to form a closed whole. The upper opening of the closed whole is connected to the discharge port, and the lower opening is connected to the feed end of the funnel-type fluidizing device (31). The arc-shaped sliding plate (18) is set at an acute angle to the transverse cross section of the cylindrical body (11).

5. A railway tank car for transporting powdery materials using a gravity-type pneumatic unloading method as described in any one of claims 1-4, characterized in that: The funnel-type fluidizing device (31) includes a funnel-type small end cap outer wall (36); the upper end of the funnel-type small end cap outer wall (36) is connected to the inlet and outlet of the funnel-type fluidizing device (31), and the lower end is connected to the outlet of the funnel-type fluidizing device and the corresponding inlet on the unloading pipeline (33). A perforated plate (37) adapted to it is provided inside; the perforated plate (37) is covered with a breathable canvas (38), and multiple pressure strips (39) are arranged on the breathable canvas (38) along the radial direction of the funnel-type small end cap outer wall (36). The multiple pressure strips (39) are evenly arranged on the circumference of the funnel-type small end cap outer wall (36).

6. A railway tank car for transporting powder and granular materials using a gravity-pneumatic unloading method as described in claim 5, characterized in that: A butterfly valve is installed between the lower end of the outer wall (36) of the funnel-shaped small end cap and the unloading pipeline (33).

7. A railway tank car for transporting powder and granular materials using a gravity-pneumatic unloading method as described in claim 6, characterized in that: A safety valve (310) and a pressure gauge (311) are installed on the air intake pipe (34).

8. A railway tank car for transporting powder and granular materials using a gravity-pneumatic unloading method as described in claim 7, characterized in that: The discharge ends of the two discharge pipes (33) are connected to the discharge outlet via a tee (312).

9. A railway tank car for transporting powdered materials using a gravity-pneumatic unloading method as described in claim 8, characterized in that: N＝3。

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