A ballast hopper car unloading dust suppression device and ballast hopper car

Abstract

The application discloses a ballast hopper car unloading dust suppression device and a ballast hopper car, and relates to the field of railway freight cars.The device comprises a wind supply gate, one end of which is connected with a wind storage cylinder, a water tank, one end of which is connected with the other end of the wind supply gate, a pressure boosting control box, the water inlet of the pressure boosting control box being connected with the other end of the water tank through a water inlet pipe, the air inlet of the pressure boosting control box being connected with the other end of the wind supply gate, the water inlet of the pressure boosting control box being connected with the water outlet of the pressure boosting control box through a pressure boosting pump in the pressure boosting control box, and the air inlet of the pressure boosting control box being connected with the air outlet of the pressure boosting control box through a proportional valve in the pressure boosting control box; the device further comprises a nozzle structure, which comprises a mixing chamber and a nozzle, the water outlet of the pressure boosting control box and the air outlet of the pressure boosting control box being communicated with the inlet end of the mixing chamber, and the outlet end of the mixing chamber being communicated with the nozzle; the device enables the water in the water tank to flow into the mixing chamber steadily under a certain pressure, improves the atomization effect, and meets the dust suppression operation requirements of the ballast hopper car.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of railway freight cars, and more particularly relates to a ballast hopper car unloading dust suppression device and a ballast hopper car. BACKGROUND

[0002] In 2003, the CSR Taiyuan Company designed a K13NK type ballast hopper car with a dust removal system to improve the ballast unloading working environment for the operator of the ballast hopper car and reduce the ballast unloading dust. The dust removal device uses the pressure air in the air storage cylinder to make the water in the water tank directly sprayed through the nozzle. However, in actual use, it is found that the dust removal device is less used due to the low water flow dust suppression effect caused by the water tank icing and the nozzle water flow caused by the low temperature in the north in winter. In recent years, with the implementation of environmental protection policies and the beginning of the railway bureau group company to pay attention to improving the working environment and reducing the pollution of dust to the surrounding environment of the line, there are measures for spraying dust on the ballast during the loading operation process and after loading, so as to increase the humidity of the ballast, thereby greatly reducing the ballast unloading dust. However, due to the influence of the operation window time and the distance between the ballast loading site and the ballast unloading operation area, the ballast after loading is dry again due to the long storage time, and a large amount of dust will be generated during the ballast unloading operation process. Therefore, a dust suppression device needs to be designed and developed to adapt to the working environment and dust suppression efficiency of the railway ballast hopper car. To realize this function, the following problems exist:

[0003] 1. The ballast hopper car lays the ballast in the process of walking and unloading, and the vehicle speed is 6-15 km / h. This requires that the dust suppression device control and the unloading control can be synchronized, and since the lower limit of the railway is a multi-segment curve, there are a large number of equipment outside the limit, so the dust suppression device should not exceed the limit in any case;

[0004] 2. The ballast hopper car bottom door opening and closing system uses the pressure air in the air storage cylinder after the locomotive is fixed to charge air as the power source, so the air volume is limited. In order to ensure the normal use of the bottom door opening and closing and provide pressure air for the dust suppression device, the difficulty of realizing the large dust suppression effect with less air volume needs to be considered;

[0005] 3. The original dust removal device is arranged at both ends of the vehicle, which increases the length of the air pipe and the water pipe, resulting in poor dust removal effect of the vehicle and large consumption of pressure air;

[0006] 4. The original nozzle is a circular hole structure, and the water flow is in the form of a water column when spraying, which has poor dust suppression effect;

[0007] 5. The original nozzle is made of plain carbon steel and is welded on the water pipe. Due to the influence of welding personnel, process and other factors, the quality is not easy to guarantee, and there is a risk of corrosion and falling in the long-term outdoor environment;

[0008] 6. The water tank lacks insulation, which causes it to freeze when stored in low-temperature environments, making dust suppression impossible and directly affecting the vehicle's winter operating time. In addition, the inconvenience of draining the water tank also poses a risk of damage to the vehicle's facilities. Summary of the Invention

[0009] The purpose of this invention is to address the shortcomings of existing technologies by providing a dust suppression device for unloading ballast hopper cars and a ballast hopper car. This device ensures that the water in the water tank has a certain pressure and flows smoothly into the mixing chamber, thereby improving the atomization effect and meeting the dust suppression requirements of ballast hopper cars.

[0010] To achieve the above objectives, the present invention provides a dust suppression device for unloading ballast hopper cars, comprising:

[0011] The air supply valve is connected at one end to the air reservoir.

[0012] The water tank is connected at one end to the other end of the air supply valve via the first air duct;

[0013] A booster control box, wherein the water inlet of the booster control box is connected to the other end of the water tank through a water inlet pipe, and the air inlet of the booster control box is connected to the other end of the air supply valve through a second air pipe. Inside the booster control box, the water inlet of the booster control box is connected to the water outlet of the booster control box through a booster pump, and the air inlet of the booster control box is connected to the air outlet of the booster control box through a proportional valve.

[0014] The nozzle structure includes a mixing chamber and a nozzle. The water outlet and air outlet of the pressurization control box are connected to the inlet end of the mixing chamber, and the outlet end of the mixing chamber is connected to the nozzle.

[0015] Optionally, the nozzle structure further includes:

[0016] The valve body is provided with an air passage and a water passage. The inlet of the air passage is connected to the air outlet of the booster control box through an air supply pipe, and the inlet of the water passage is connected to the water outlet of the booster control box through a water supply pipe. The outlet of the air passage is connected to the mixing chamber.

[0017] An adjusting rod is screwed to the valve body. The end of the adjusting rod is located between the outlet of the water passage and the mixing chamber. Rotating the adjusting rod can change the water inlet of the mixing chamber.

[0018] The nozzle is connected to the valve body at one end and has a notch at the other end. The notch is trapezoidal in shape and its cross-section gradually widens from one end of the nozzle to the other. The nozzle is located at the bottom of the notch.

[0019] Optionally, the nozzle is provided with a guide groove in the circumferential direction, and the included angle of the guide groove is not less than 60 degrees.

[0020] Optionally, a plurality of nozzle structures are arranged on both sides of the vehicle body, respectively, and the plurality of nozzle structures on each side are connected through the water channel and the gas channel, the water channels on both sides are connected with the water outlet of the pressure control box through a first three-way joint, and the gas channels on both sides are connected with the gas outlet of the pressure control box through a second three-way joint.

[0021] Optionally, the water tank is in a cylindrical structure, and a water inlet pipe and a drain pipe are further arranged on the water tank and penetrate the floor of the vehicle body.

[0022] Optionally, the pressure control box and the air supply plug valve are arranged below the operating valve.

[0023] Optionally, a water supply plug valve and a filter are arranged on the water inlet pipe.

[0024] Optionally, the volume of the water tank is smaller than the volume of the air storage cylinder.

[0025] Optionally, a temperature insulation layer is arranged outside the water tank, and the material of the temperature insulation layer is heat insulation rock wool.

[0026] The application further provides a ballast hopper car, characterized in that the ballast hopper car is provided with the ballast hopper car unloading and dust suppression device.

[0027] The application provides a ballast hopper car unloading and dust suppression device and a ballast hopper car, which have the following beneficial effects:

[0028] 1. The air source of the ballast hopper car unloading and dust suppression device comes from the air storage cylinder of the bottom door opening and closing system, and the entire operation process is adapted to the air control bottom door opening and closing system of the existing ballast hopper car and has no influence on the original air-operated bottom door opening and closing operation process.

[0029] 2. The operation accessories of the ballast hopper car unloading and dust suppression device are installed in the operating room of the ballast hopper car, the pipeline is arranged at the bottom door of the hopper of the vehicle body, and the limit requirements are met, thereby meeting the safety requirements of the vehicle.

[0030] 3. The ballast hopper car unloading and dust suppression device can be synchronously controlled with the bottom door opening and closing system, and the environmental pollution caused by dust is reduced during the entire ballast unloading operation process, and the environment on both sides of the railway line is improved.

[0031] 4. The ballast hopper car unloading and dust suppression device improves the atomization and reduction effect, reduces the volume of the water tank, and also reduces the water consumption and air consumption, so that the volume of the water tank is smaller, the arrangement in the operating room of the vehicle is utilized, the assembly space is increased, and the subsequent maintenance of the device is facilitated.

[0032] 5. The main components of the dust suppression device for unloading ballast hopper cars are made of stainless steel, which improves the corrosion resistance of the components, extends the overall service life, and is compatible with the vehicle maintenance cycle.

[0033] 6. The dust suppression device for unloading ballast hopper cars can be adjusted by rotating the adjusting rod. It can be further adjusted according to the water spraying situation of ballast after loading into the ballast hopper car, thereby reducing the spraying distance and water consumption, and enabling multiple uses.

[0034] 7. The water tank of the dust suppression device for unloading ballast hopper cars is covered with a heat insulation layer, which improves the heat preservation effect of the water tank, extends the service life of the dust suppression device in winter, and meets the requirements of the ballast unloading operation cycle of ballast hopper cars.

[0035] 8. The water tank of the dust suppression device for unloading ballast hopper truck is equipped with a water inlet pipe and a drain pipe. When the vehicle is outdoors for a long time in winter, the water tank can be drained quickly to avoid freezing damage to the pipes and air cylinder.

[0036] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0037] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the invention.

[0038] Figure 1 A schematic diagram of a dust suppression device for unloading ballast hopper cars according to an embodiment of the present invention is shown.

[0039] Figure 2 A schematic diagram of a booster control box according to an embodiment of the present invention is shown.

[0040] Figure 3 A schematic diagram of a nozzle structure according to an embodiment of the present invention is shown.

[0041] Figure 4 It shows Figure 3 Side view.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1. Air supply plug; 2. Water tank; 3. Booster control box; 4. Water inlet pipe; 5. Second air duct; 6. Booster pump; 7. Proportional valve; 8. Mixing chamber; 9. Nozzle; 10. Valve body; 11. Air passage; 12. Water passage; 13. Air supply pipe; 14. Water supply pipe; 15. Adjusting rod; 16. Nozzle; 17. Notch; 18. First tee fitting; 19. Second tee fitting; 20. Water supply plug; 21. Filter; 22. First air duct. Detailed Implementation

[0044] Preferred embodiments of the invention will now be described in more detail. While preferred embodiments of the invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0045] This invention provides a dust suppression device for unloading ballast hopper cars, comprising:

[0046] The air supply valve is connected at one end to the air reservoir.

[0047] The water tank is connected at one end to the other end of the air supply valve via the first air duct.

[0048] The booster control box has its water inlet connected to the other end of the water tank via a water inlet pipe, and its air inlet connected to the other end of the air supply valve via a second air duct. Inside the booster control box, the water inlet is connected to the water outlet via a booster pump, and the air inlet is connected to the air outlet via a proportional valve.

[0049] The nozzle structure includes a mixing chamber and a nozzle. The water outlet and air outlet of the booster control box are connected to the inlet end of the mixing chamber, and the outlet end of the mixing chamber is connected to the nozzle.

[0050] Specifically, the dust suppression device is connected to the air storage cylinder via an air supply plug, which provides pressurized air to enable the dust suppression device to operate normally. The air storage cylinder is connected to a water tank and a pressurization control box. In addition to supplying liquid from the water tank to the nozzle structure, it also supplies air to the pressurization control box for proportional adjustment, and supplies it together with the liquid to the nozzle structure for mixing before finally spraying it out to suppress dust during ballast unloading operations.

[0051] Optionally, the nozzle structure also includes:

[0052] The valve body contains an air passage and a water passage. The inlet of the air passage is connected to the air outlet of the booster control box via an air supply pipe, and the inlet of the water passage is connected to the water outlet of the booster control box via a water supply pipe. The outlet of the air passage is connected to the mixing chamber.

[0053] The adjusting rod is screwed to the valve body. The end of the adjusting rod is located between the outlet of the water channel and the mixing chamber. Rotating the adjusting rod can change the water inlet of the mixing chamber.

[0054] The nozzle is connected to the valve body at one end and has a notch at the other end. The notch is trapezoidal in shape and its cross-section gradually expands from one end of the nozzle to the other. The nozzle is located at the bottom of the notch.

[0055] Specifically, the valve body of this nozzle structure contains separate air and water channels. The inlets of these two channels connect to the air outlet and water outlet of the booster control box, respectively. The two channels are distinct within the valve body, and their outlets connect to the mixer. An adjusting rod extends from the bottom of the valve body and has an external thread structure. The head of the adjusting rod is tapered and positioned between the mixing chamber and the water channel, facilitating the adjustment of the water flow into the mixing chamber. When the adjusting rod is tightened and shortened to its maximum length, the water channel is completely closed, preventing water mist formation. When the adjusting rod is rotated to its longest length, the water channel is fully open, maximizing the spray distance and the size of the water mist and its particles. The nozzle head features a trapezoidal notch to increase the spray range of the water mist and suppress more dust.

[0056] In one embodiment, the diameter of the water passage can be set to 3mm, and the diameter of the air passage can be set to 4mm.

[0057] The principle behind this dust suppression device for ballast unloading is as follows: The ballast loaded in the ballast funnel car mainly consists of various types of ballast with a particle size of 15mm to 40mm. This ballast is made from crushed large stones, and although it has passed initial screening, a lot of powder remains. During the ballast unloading operation in the ballast funnel car, there is a 600mm drop from the bottom gate to the track bed. During the descent, the flow will carry up lighter powder, thus forming floating dust. This type of floating dust consists of micron-sized particles. When the water flow area is small or the water droplets are too large, it will not have a good dust suppression effect. Based on the principle of water mist dust suppression, when the particle size of the water mist particles is close to that of the dust particles, and the water mist covers the dust area, the dust particles will be adsorbed by the water mist particles. At the same time, under the action of electrostatics and the surface tension of water molecules, the dust particles will agglomerate together. When the weight of the dust agglomerate is greater than the buoyancy of the air, it will fall to the ground, thereby reducing floating dust and reducing environmental pollution. The dust suppression device of this vehicle also uses pipeline layout and components such as pressurization control box and nozzle structure to form micron-level water mist particles at the bottom doors on both sides of the ballast hopper car, thereby achieving the dust suppression effect during the ballast unloading operation of the ballast hopper car.

[0058] Optionally, the nozzle is provided with a guide groove along the circumference, and the included angle of the guide groove is not less than 60°.

[0059] Specifically, the nozzle in the spray head is designed in the shape of a guide groove, with the angle between the opposing sidewalls of the guide groove being no less than 60°. This allows the sprayed water mist to form a fan-shaped surface. The turbulence generated by this nozzle structure within the mixer produces powerful shock waves that shear the water into small droplets. After intense vortex disturbance and transformation, these small droplets become droplets thousands of micrometers in size, which are then atomized and dispersed under pressurized air. This increases the atomization area and atomization effect even at relatively low water pressure. Specific nozzle structure parameters are shown in the table below.

[0060] Optionally, multiple nozzle structures are provided on both sides of the vehicle body. The multiple nozzle structures on each side are connected through water passages and air passages. The water passages on both sides are connected to the water outlet of the boost control box through a first tee fitting, and the air passages on both sides are connected to the air outlet of the boost control box through a second tee fitting.

[0061] Specifically, the nozzle structure is set in two rows and positioned below the side beam of the vehicle body chassis to prevent the vehicle from exceeding the boundary and meet the vehicle's operational safety requirements. The two T-fittings are connected to the water outlet and air outlet of the booster control box, respectively, so that liquid and gas are delivered to the appropriate positions on the vehicle body without losing pressure.

[0062] Optionally, the water tank has a cylindrical structure, and an inlet pipe and a drain pipe are also installed on the water tank, which run through the floor of the vehicle body.

[0063] Specifically, the water tank is designed with a cylindrical structure, which improves the stress distribution of the water tank and meets the structural strength required for vehicle impact. The water tank is located between the bidirectional air cylinder in the operator's cab and the end wall and funnel end plate. A connecting hole is opened in the floor to connect the water tank's water inlet pipe and water outlet pipe to the water tank. This allows the ballast loading yard workers to quickly connect the water pipes for water supply operations, or to drain the water when there is no ballast unloading operation for a long period of time during winter. In addition, the space between the bogie and the funnel under the vehicle body in this location is easy to work in, and the drained water will not flow onto the bogie, avoiding the risk of increasing corrosion of vehicle parts.

[0064] Optionally, the booster control box and the air supply plug are located below the control valve.

[0065] Specifically, the booster control box, water supply plug, and air supply plug are arranged on the lower side of the control valve, so that personnel can turn on the dust suppression device before unloading the ballast, increasing the humidity around the ballast unloading vehicle, and then carry out the unloading operation to improve the dust suppression effect.

[0066] Optionally, a water inlet valve and a filter are installed on the water inlet pipe.

[0067] Specifically, installing a water inlet plug and filter on the water inlet pipe helps prevent pipe blockage at the booster pump or nozzle location.

[0068] Optionally, the volume of the water tank is smaller than the volume of the air storage cylinder.

[0069] Specifically, when the volume of the air storage cylinder is 200L, the volume of the water tank can be set to be smaller than that of the air storage cylinder. This ensures that the bottom door opening and closing system and the dust suppression device operate simultaneously without affecting the original pneumatic bottom door opening and closing operation.

[0070] Optionally, the water tank is provided with an insulation layer on the outside, and the insulation layer is made of heat-insulating rock wool.

[0071] Specifically, the water tank is wrapped with more than 7cm of insulating rock wool to meet the requirements of the ballast unloading cycle of the ballast hopper truck. In addition, a magnetic level gauge with a stainless steel outer sleeve is added to the outside of the water tank to facilitate observation of the water level when the vehicle is being filled with water, thus meeting the dust suppression requirements of the ballast hopper truck.

[0072] The present invention also provides a ballast hopper car, characterized in that it includes the above-mentioned ballast hopper car unloading dust suppression device.

[0073] Example

[0074] like Figures 1 to 4 As shown, the present invention provides a dust suppression device for unloading ballast hopper cars, comprising:

[0075] Air supply valve 1, one end of which is connected to the air storage cylinder.

[0076] Water tank 2 is connected at one end to the other end of air supply plug 1 via first air duct 22;

[0077] The booster control box 3 has its water inlet connected to the other end of the water tank 2 via the water inlet pipe 4, and its air inlet connected to the other end of the air supply plug 1 via the second air pipe 5. Inside the booster control box 3, the water inlet of the booster control box 3 is connected to the water outlet of the booster control box 3 via the booster pump 6, and the air inlet of the booster control box 3 is connected to the air outlet of the booster control box 3 via the proportional valve 7.

[0078] The nozzle structure includes a mixing chamber 8 and a nozzle 9. The water outlet and air outlet of the pressurization control box 3 are connected to the inlet end of the mixing chamber 8, and the outlet end of the mixing chamber 8 is connected to the nozzle 9.

[0079] In this embodiment, the nozzle structure further includes:

[0080] Valve body 10, with air passage 11 and water passage 12 inside. The inlet of air passage 11 is connected to the air outlet of booster control box 3 through air supply pipe 13, and the inlet of water passage 12 is connected to the water outlet of booster control box 3 through water supply pipe 14. The outlet of air passage 11 is connected to mixing chamber 8.

[0081] The adjusting rod 15 is screwed to the valve body 10. The end of the adjusting rod 15 is located between the outlet of the water channel 12 and the mixing chamber 8. Rotating the adjusting rod 15 can change the water inlet of the mixing chamber 8.

[0082] The nozzle 16 is connected to the valve body 10 at one end, and a notch 17 is provided at the other end of the nozzle 16. The notch 17 is trapezoidal in shape, and the cross-section of the notch 17 gradually expands from one end of the nozzle 16 to the other end. The nozzle 9 is located at the bottom of the notch 17.

[0083] In this embodiment, the nozzle 9 is provided with a guide groove along the circumference, and the included angle of the guide groove is not less than 60°.

[0084] In this embodiment, multiple nozzle structures are respectively provided on both sides of the vehicle body. The multiple nozzle structures on each side are connected by air supply pipe 13 and water supply pipe 14. The water supply pipes 14 on both sides are connected to the water outlet of the boost control box 3 through the first tee fitting 18, and the air supply pipes 13 on both sides are connected to the air outlet of the boost control box 3 through the second tee fitting 19.

[0085] In this embodiment, the water tank 2 is a cylindrical structure, and the water tank 2 is also equipped with an inlet pipe and a drain pipe, which penetrate through the floor of the vehicle body.

[0086] In this embodiment, the booster control box 3 and the air supply plug 1 are located below the control valve.

[0087] In this embodiment, the water inlet pipe 3 is equipped with a water supply plug 20 and a filter 21.

[0088] In this embodiment, the volume of water tank 2 is smaller than the volume of air storage cylinder.

[0089] In this embodiment, the water tank 2 is provided with an insulation layer on the outside, and the insulation layer is made of heat-insulating rock wool.

[0090] The present invention also provides a ballast hopper car, characterized in that it includes the above-mentioned ballast hopper car unloading dust suppression device.

[0091] In summary, the dust suppression device fills water tank 2 with water when loading ballast into the ballast funnel car, and the water level should reach above the scale of the liquid level gauge. Before unloading ballast, the locomotive inflates the air storage cylinders of each ballast funnel car to 500kPa to 600kPa. When reaching the unloading section, the unloading operation is carried out by first opening the water supply plug 20, then opening the air supply plug 1, and then operating the control valve to open the bottom door to carry out the unloading operation. After unloading is completed, the control valve is closed first, and then the air supply plug 1 and water supply plug 20 of the dust suppression device are closed. When the vehicle is left unloaded for a long time and the ambient temperature is below zero, the drain valve at the bottom of the water tank is opened to drain the water in the water tank.

[0092] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A dust suppression device for unloading ballast hopper cars, characterized in that, include: The air supply valve is connected at one end to the air reservoir. The water tank is connected at one end to the other end of the air supply valve via the first air duct; A booster control box, wherein the water inlet of the booster control box is connected to the other end of the water tank through a water inlet pipe, and the air inlet of the booster control box is connected to the other end of the air supply valve through a second air pipe. Inside the booster control box, the water inlet of the booster control box is connected to the water outlet of the booster control box through a booster pump, and the air inlet of the booster control box is connected to the air outlet of the booster control box through a proportional valve. The nozzle structure includes a mixing chamber and a nozzle. The water outlet and air outlet of the pressurization control box are connected to the inlet end of the mixing chamber, and the outlet end of the mixing chamber is connected to the nozzle. The nozzle structure also includes: The valve body is provided with an air passage and a water passage. The inlet of the air passage is connected to the air outlet of the booster control box through an air supply pipe, and the inlet of the water passage is connected to the water outlet of the booster control box through a water supply pipe. The outlet of the air passage is connected to the mixing chamber. An adjusting rod is screwed to the valve body. The end of the adjusting rod is located between the outlet of the water passage and the mixing chamber. Rotating the adjusting rod can change the water inlet of the mixing chamber. The nozzle is connected to the valve body at one end and has a notch at the other end. The notch is trapezoidal in shape and its cross-section gradually widens from one end of the nozzle to the other. The nozzle is located at the bottom of the notch. The nozzle structure is provided on both sides of the vehicle body. The multiple nozzle structures on each side are connected through the water passage and the air passage. The water passage on both sides is connected to the water outlet of the boost control box through the first tee, and the air passage on both sides is connected to the air outlet of the boost control box through the second tee. The water tank has a cylindrical structure, and an inlet pipe and a drain pipe are also provided on the water tank. The inlet pipe and the drain pipe pass through the floor of the vehicle body. The booster control box and the air supply plug are located below the control valve; The volume of the water tank is smaller than the volume of the air storage cylinder; The water tank is equipped with an insulation layer on the outside, and the insulation layer is made of heat-insulating rock wool.

2. The dust suppression device for unloading ballast hopper cars according to claim 1, characterized in that, The nozzle is provided with a guide groove along the circumference, and the included angle of the guide groove is not less than 60°.

3. The dust suppression device for unloading ballast hopper cars according to claim 1, characterized in that, The water inlet pipe is equipped with a water supply plug and a filter.

4. A ballast hopper cart, characterized in that, Includes the dust suppression device for unloading ballast hopper cars according to any one of claims 1-3.

Images