Railway freight carriage propelling device

Abstract

The invention discloses a railway freight carriage propelling device, and belongs to the technical field of railway train marshalling. The device mainly comprises a base, a lifting folding and unfolding mechanism, a pushing mechanism and an advancing mechanism. The base can realize initial height positioning of the lifting folding and unfolding mechanism and the pushing mechanism through longitudinal adjustment; the height and width of the lifting folding and unfolding mechanism can be adjusted through transmission of an electric push rod and a lead screw, and the pushing mechanism is driven to adapt to different specifications of rails and carriage wheel positions; the pushing mechanism adopts a transmission chain consisting of driving and driven friction wheels to drive wheels of the pushed carriage to rotate; the advancing mechanism can provide power for the device to move along the track and auxiliary traction force for pushing the carriage. The device can support remote control through a battery and a communication module, realizes efficient, stable and safe propulsion of carriages in railway freight marshalling operation, adapts to complex environments and avoids manual near-rail operation risks.

Description

Technical Field

[0001] This invention relates to the field of railway train formation technology, and in particular to a railway freight car propulsion device. Background Technology

[0002] With the development of the global freight industry, rail transport has become a major mode of cross-regional freight transport. To adapt to the transport needs of different destinations and product categories, the railway network has given rise to complex train marshalling operations. As a key node in the railway transport network, the marshalling yard is responsible for demarcating, reassembling, and transshipping arriving trains. Its operational efficiency and accuracy directly affect the smoothness of the entire railway transport network. With the continuous growth of freight volume and the increasing complexity of transport routes, traditional marshalling methods face severe challenges in terms of efficiency and accuracy. Promoting the transformation of marshalling operations towards intelligence and automation has become an inevitable requirement for the industry's development.

[0003] Currently, moving carriages in railway freight marshalling mainly relies on two traditional methods: one is manual pushing by multiple workers, which is inefficient and poses significant safety hazards; the other is using pre-embedded winches or locomotive traction, which presents problems such as equipment fixation or interference with other operations. Although there are existing vehicle moving boosters disclosed in patent CN201510263040.X, which have the advantages of simple structure and low cost, they still rely on manual on-site operation, which is not safe enough and difficult to adapt to the complex railway environment. While an aircraft booster proposed in patent CN202422144365.3 uses a similar principle, its limited thrust, reliance on manual labor, and inability to move autonomously make it unsuitable for the propulsion needs of heavy-haul railway carriages. Overall, existing devices generally suffer from low automation, insufficient output thrust, lack of mobility and environmental adaptability, and cannot meet the urgent need for efficient, flexible, and high-thrust propulsion equipment in railway freight marshalling operations. Summary of the Invention

[0004] This invention addresses the shortcomings of existing technologies by proposing a railway freight car propulsion device. The device mainly comprises a base, a lifting and folding mechanism, a propulsion mechanism, and a traveling mechanism. Through the coordinated operation of these components, the car is propelled efficiently and stably on the track.

[0005] The base includes a fixed seat and a longitudinally adjustable seat, which are detachably connected by bolts. The fixed seat includes a vertically arranged upright plate and a horizontally arranged steel frame main plate for mounting the traveling mechanism. The longitudinally adjustable seat includes a sliding partition and a fork bracket connected to the sliding partition. Six sets of longitudinally extending elongated holes are correspondingly provided on the upright plate and the sliding partition. Bolts are used to fix the longitudinally adjustable seat at different heights in the holes, allowing for longitudinal position adjustment relative to the fixed seat. A lifting and folding mechanism is further connected to the fork of the fork bracket, and the lifting and folding mechanism is further connected to a pushing mechanism. Adjusting the longitudinal position of the longitudinally adjustable seat relative to the fixed seat synchronously drives the lifting and folding mechanism and the pushing mechanism mounted on it to perform overall height adjustment, thus initially adapting to different specifications of rails and sleepers, ensuring accurate alignment and effective contact between the pushing mechanism and the wheels of the pushed carriage.

[0006] It should be noted that, for ease of description and understanding of the present invention, the orientation of the device is defined as follows: the end where the front fork bracket is located is defined as "front," and the direction perpendicular to the main steel frame is defined as "longitudinal." Based on this, those skilled in the art can accordingly understand and derive orientations such as "lateral," "horizontal," "rear," "left," and "right." Furthermore, the above orientation definitions are merely exemplary descriptions used to clearly illustrate the present invention and should not be construed as limiting the present invention.

[0007] It should be noted that the inner side of the fork bracket is equipped with four sets of slide rails and corresponding sliders, used to connect and guide the lifting and folding mechanism for height adjustment and shape transformation. Specifically, two longitudinal slide rails are symmetrically arranged on the left and right sides of the front inner wall of the fork, with two sliders installed on each slide rail. On the rear inner wall of the fork, two sliders are longitudinally arranged on the left and right sides respectively, and correspondingly, the two sliders on the same side cooperate with a longitudinally arranged slide rail. Through the above-mentioned slide rail and slider combination structure on the front and rear sides, the lifting and folding mechanism is stably connected and can smoothly adjust the height and complete the shape transformation in the longitudinal direction.

[0008] The lifting and folding mechanism mainly includes a support frame, a lifting component, and a folding component. The support frame is generally U-shaped, and its front and rear outer surfaces respectively cooperate with the slide rail and slider combination structure set on the front and rear inner surfaces of the front fork bracket, enabling the entire lifting and folding mechanism to smoothly and reliably change height and adjust shape along the longitudinal direction. The lifting component mainly consists of two electric push rods and a top block. The two electric push rods are forked and arranged on the front fork bracket, and the top block is located at the contact position of the push heads of the two electric push rods. On the rear outer surface of the support frame, corresponding to the position above the top block, there is a top groove structure adapted to the top block. When the electric push rods extend, they further push the top block, causing the top block to push upward against the top groove of the support frame, thereby driving the entire lifting and folding mechanism to rise. Conversely, when the electric push rods retract, the mechanism descends until it returns to the initial height.

[0009] It should be noted that the support frame has a slide rail on each of its front and rear inner sides, and two sliders are installed at both ends of each slide rail. The sliders further cooperate with the pushing mechanism, and under the action of the folding component, drive the lifting and folding mechanism to smoothly adjust the width in the horizontal direction and complete the shape transformation.

[0010] The folding and unfolding component mainly includes a power unit, two lead screws, and two lead screw sleeves. The power unit includes a servo motor, a bevel gear, two cylindrical bevel gears, and two bearing supports. The servo motor is mounted in the middle of the front outer side of the support frame, and its output shaft passes through a corresponding hole in the support frame and connects to the bevel gear. The two cylindrical bevel gears are symmetrically arranged and mesh with the bevel gears. Each cylindrical bevel gear has a lead screw connected to its other end, and the two lead screws are positioned and supported by bearing supports. Each lead screw has a lead screw sleeve installed at its other end, and the two lead screw sleeves are connected to the left and right ends of the front inner side of the support frame, respectively. The lead screw sleeves are further connected to a pushing mechanism on their opposite sides of the mating surface with the front inner side of the support frame. When the servo motor rotates, it drives the bevel gears to rotate, which in turn drives the two cylindrical bevel gears and the lead screws connected to them to rotate synchronously. The rotation of the lead screws causes the lead screw sleeves to move laterally along the lead screw axis, thereby realizing the width adjustment of the lifting and unfolding mechanism and driving the pushing mechanism mounted on it to synchronously complete the adaptive adjustment of the overall width.

[0011] By adjusting the lifting and unfolding mechanism in both height and width, the height and width of the drive mechanism mounted on it can be synchronously changed. Therefore, this invention can flexibly adapt to different specifications of rails, sleepers, and carriage structures, thereby ensuring precise alignment and reliable contact between the drive mechanism and the carriage wheels, and improving the device's adaptability to the working environment.

[0012] The propulsion mechanism comprises two propulsion units, symmetrically positioned at the left and right ends of the lifting and folding mechanism. Each propulsion unit mainly includes a frame, a high-torque motor, one active friction wheel, two passive friction wheels, and a support wheel. One end of the active friction wheel is connected to the output shaft of the high-torque motor, and the other end is equipped with a gear, which supports it to the frame. One end of each of the two passive friction wheels is supported by the frame, and the other end is also equipped with a gear, similarly supported to the frame. Both ends of the support wheel are directly supported by the frame. The active friction wheel and the two passive friction wheels are arranged in a triangular configuration, with their gears meshing to form a transmission chain. During operation, the high-torque motor drives the active friction wheel to rotate, which in turn drives the two passive friction wheels to rotate synchronously in opposite directions through gear meshing. The passive friction wheel at the front contacts the wheels of the carriage, relying on friction to drive the wheels to rotate, thus propelling the carriage forward. The passive friction wheel at the rear works in conjunction with the support wheel to provide support for the frame, enhancing structural rigidity, preventing deformation, and providing auxiliary thrust during propulsion to ensure smooth and reliable propulsion.

[0013] It should be noted that the "support" of the active friction wheel, passive friction wheel, and support wheel on the frame only defines their relative positional relationship with the frame and does not restrict their rotational function. In actual operation, each wheel can rotate around its own axis.

[0014] The traveling mechanism includes two traveling units, arranged one behind the other on the base, which together drive the entire device to move along the track. During propulsion, the traveling units can also provide auxiliary traction to compensate for insufficient thrust output from the propulsion mechanism, ensuring smooth and reliable movement of the carriage.

[0015] It should be noted that the rear of the base can be equipped with a battery and communication module to provide power to the device and enable remote control. This allows operators to control the device from a safe distance, fundamentally eliminating the safety risks associated with personnel entering the track work area, while ensuring that the operation of this device will not interfere with the normal operation of other tasks within the track area.

[0016] Technical Effects: This invention utilizes a height- and width-adjustable lifting and unfolding mechanism, enabling the device to flexibly adapt to different track and carriage specifications, achieving precise alignment. Combined with the high-torque drive of the propulsion mechanism and the auxiliary traction of the traveling mechanism, a composite thrust is formed, ensuring the smooth and reliable propulsion of heavy-load carriages. Equipped with power and communication modules, the device supports remote control by operators, fundamentally eliminating the safety risks of personnel entering the tracks and avoiding interference with other operations within the station. This significantly improves the automation level and work efficiency of railway freight marshalling operations. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings are exemplary and not intended to limit the present invention. Those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the railway freight car propulsion device provided in an embodiment of the present invention.

[0019] Figure 2 An exploded view of a partial structure of a railway freight car propulsion device provided in an embodiment of the present invention.

[0020] Figure 3 A partial schematic diagram of the front end component of the railway freight car propulsion device provided in an embodiment of the present invention.

[0021] Figure 4 This is a partial exploded view of the front-end component of the railway freight car propulsion device provided in an embodiment of the present invention.

[0022] Figure 5 A schematic diagram of the propulsion mechanism of a railway freight car propulsion device provided in an embodiment of the present invention.

[0023] Figure 6 A schematic diagram showing the details of the propulsion mechanism of the railway freight car propulsion device provided in an embodiment of the present invention.

[0024] Figure 7 This is a top view of the overall structure of the railway freight car propulsion device provided in an embodiment of the present invention.

[0025] Labeling Explanation: 1. Base; 101. Fixed Base; 10101. Vertical Plate; 10102. Steel Frame Main Board; 102. Longitudinal Adjustment Seat; 10201. Sliding Partition; 10202. Front Fork Bracket; 2. Lifting and Folding Mechanism; 201. Support Frame; 202. Lifting Component; 20201. Electric Push Rod; 20202. Top Block; 203. Folding Component; 20301. Power Unit; 2030101. Servo Motor; 203 0102, Bevel gear; 2030103, Cylindrical bevel gear; 2030104, Bearing support; 20302, Lead screw; 20303, Lead screw sleeve; 3, Pushing mechanism; 301, Pushing unit; 30101, Frame; 30102, High torque motor; 30103, Active friction wheel; 30104, Passive friction wheel; 30105, Support wheel; 4, Traveling mechanism; 401, Traveling unit; 5, Slide rail; 6, Slider. Detailed Implementation

[0026] To clearly illustrate the embodiments of the present invention, further description will be provided below in conjunction with the accompanying drawings. In the drawings, the same or similar reference numerals represent the same or similar components or components having the same or similar functions. It should be understood that the following description in conjunction with the accompanying drawings is merely exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0027] It should be noted that the same reference numerals or numbers may be used repeatedly in different embodiments or figures. Such repetition is only for simplifying the text description and figure indication, and does not indicate that there is necessarily a specific relationship between the various embodiments or structures.

[0028] In the description of this invention, the terms "front," "rear," "left," "right," "longitudinal," "lateral," "horizontal," "center," "inner," and "outer" are defined based on the orientations or positions shown in the accompanying drawings. These definitions are merely for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components referred to must have a specific orientation, nor should they constitute a limitation on this invention.

[0029] The following description, in conjunction with specific embodiments and accompanying drawings, illustrates and explains different structures and component arrangements of the present invention. It should be understood that these examples are merely illustrative of the invention and should not be construed as limiting its scope.

[0030] Please see Figure 1 This invention provides a railway freight car propulsion device, which mainly includes a base 1, a lifting and unfolding mechanism 2, a pushing mechanism 3, and a traveling mechanism 4. These components work together to achieve efficient and stable propulsion of the car on the track.

[0031] See Figures 1 to 3The base 1 includes a fixed base 101 and a longitudinal adjustment base 102, which are detachably connected by bolts. The fixed base 101 consists of a vertically arranged upright plate 10101 and a horizontally arranged steel frame main plate 10102, which is used to install the traveling mechanism 4. The longitudinal adjustment base 102 includes a sliding partition 10201 and a fork bracket 10202 connected to the sliding partition 10201. The upright plate 10101 and the sliding partition 10201 have six sets of longitudinally extending elongated holes (e.g., the part marked by solid line box I) at corresponding positions. By fixing the bolts at different height holes, the longitudinal position of the longitudinal adjustment base 102 relative to the fixed base 101 can be adjusted. The fork of the fork bracket 10202 is connected to a lifting and folding mechanism 2, which is further connected to a pushing mechanism 3. Through the aforementioned longitudinal adjustment, the lifting and folding mechanism 2 and the pushing mechanism 3 mounted on it can be simultaneously adjusted in overall height, thus initially adapting to rails and sleepers of different specifications, ensuring accurate alignment and effective contact between the pushing mechanism 3 and the wheels of the pushed carriage. Simultaneously, the inner side of the fork opening of the front fork bracket 10202 is provided with four sets of slide rails 5 and corresponding sliders 6, used to connect and guide the lifting and folding mechanism 2 in height adjustment and shape transformation. Specifically, two slide rails 5 are longitudinally arranged on the left and right sides of the front inner wall of the fork opening, with two sliders 6 installed on each slide rail 5. On the rear inner wall of the fork opening, two sliders 6 are longitudinally arranged on the left and right sides respectively, correspondingly, the two sliders 6 on the same side cooperate with a longitudinally arranged slide rail 5. Through the aforementioned front and rear slide rail and slider combination structure, a stable and slidable connection is formed between the lifting and folding mechanism 2 and the front fork bracket 10202, thereby enabling smooth and reliable height adjustment and shape transformation in the longitudinal direction.

[0032] See Figures 1 to 4The lifting and folding mechanism 2 mainly includes a support frame 201, a lifting component 202, and a folding component 203. The support frame 201 is generally U-shaped, and its front and rear outer surfaces respectively cooperate with the slide rail and slider assembly structure provided on the front and rear inner surfaces of the front fork bracket 10202, enabling the entire lifting and folding mechanism 2 to smoothly and reliably change height and adjust shape along the longitudinal direction. The lifting component 202 includes two electric push rods 20201 and a top block 20202. The two electric push rods 20201 are forked and arranged on the front fork bracket 10202, and the top block 20202 is located at the position where the push heads of the two electric push rods 20201 work together. Above the top block 20202 on the rear outer surface of the support frame 201, there is a top groove structure adapted to the top block 20202 (e.g., the part indicated by solid line box II). When the electric actuator 20201 extends, it pushes the top block 20202 upward, causing it to engage with the top groove structure of the support frame 201, thereby driving the lifting and unfolding mechanism 2 to rise as a whole. Conversely, when the electric actuator 20201 retracts, the lifting and unfolding mechanism 2 descends until it returns to its initial height. Simultaneously, a slide rail 5 is provided laterally on the front and rear inner sides of the support frame 201, with two sliders 6 at each end of each slide rail 5. The sliders 6 at both ends are respectively connected to the left and right pushing units 301 of the pushing mechanism 3. Driven by the unfolding component 203, they drive the lifting and unfolding mechanism 2 to smoothly adjust its width in the horizontal direction and complete its lateral deformation. The unfolding component 203 includes a power unit 20301, two lead screws 20302, and two lead screw sleeves 20303. The power unit 20301 includes a servo motor 2030101, a bevel gear 2030102, two cylindrical bevel gears 2030103, and two bearing supports 2030104. The servo motor 2030101 is mounted in the middle of the front outer side of the support frame 201, and its output shaft passes through the corresponding hole in the support frame 201 and connects to the bevel gear 2030102. The two cylindrical bevel gears 2030103 are symmetrically arranged and both mesh with the bevel gear 2030102. One end of each cylindrical bevel gear 2030103 is connected to a lead screw 20302, and the two lead screws 20302 are positioned and supported by bearing supports 2030104. The other end of each lead screw 20302 is fitted with a lead screw nut 20303, and the two lead screw nuts 20303 are respectively connected to the left and right ends of the front inner side of the support frame 201. The two left and right lead screw sleeves 20303 are further connected to the corresponding left and right push units 301 in the push mechanism 3 on the opposite side of their mating surfaces with the front inner side of the support frame 201. When the servo motor 2030101 rotates, it drives the bevel gear 2030102 to rotate, which in turn drives the two cylindrical bevel gears 2030103 and the two lead screws 20302 connected thereto to rotate synchronously.The rotation of the lead screw 20302 causes the two lead screw sleeves 20303 to produce lateral displacements in opposite directions along the lead screw axis, thereby realizing the width adjustment of the lifting and unfolding mechanism 2, and driving the push mechanism 3 installed on it to simultaneously complete the adaptive adjustment of the overall width.

[0033] It should be noted that by adjusting the lifting and unfolding mechanism 2 in the height and width directions, the pushing mechanism 3 installed on it can be driven to achieve corresponding changes in height and width. This allows the invention to flexibly adapt to different specifications of rails, sleepers and carriage structures, maintain precise alignment and reliable contact between the pushing mechanism 3 and the carriage wheels, and significantly improve the device's adaptability to complex working environments.

[0034] See Figures 1 to 6 The pushing mechanism 3 includes two pushing units 301, symmetrically arranged at the left and right ends of the lifting and folding mechanism 2. Each pushing unit 301 mainly includes a frame 30101, a high-torque motor 30102, an active friction wheel 30103, two passive friction wheels 30104, and a support wheel 30105. One end of the active friction wheel 30103 is connected to the output shaft of the high-torque motor 30102, and the other end is provided with a gear structure, which is supported on the frame 30101. One end of each of the two passive friction wheels 30104 is supported on the frame 30101, and the other end is also provided with a gear structure, which is supported on the frame 30101 through its respective gear end. Both ends of the support wheel 30105 are directly supported on the frame 30101. The active friction wheel 30103 and the two passive friction wheels 30104 are arranged in a triangle, and the gear ends of the three mesh with each other to form a transmission chain. During operation, the high-torque motor 30102 drives the active friction wheel 30103 to rotate, which in turn drives the two passive friction wheels 30104 to rotate synchronously in opposite directions through gear meshing. The front passive friction wheel 30104 contacts the wheels of the pushed carriage, relying on friction to drive the wheels to rotate, thus propelling the carriage forward. The rear passive friction wheel 30104 works in conjunction with the support wheel 30105 to provide support for the frame 30101, enhancing structural rigidity, preventing deformation, and providing auxiliary thrust during propulsion to ensure smooth and reliable pushing action.

[0035] Please see Figure 1 The traveling mechanism 4 includes two traveling units 401, which are arranged one in front of the other on the steel frame main board 10102 of the base 1, and together provide the power for the device to move along the track. When the carriage is being propelled, the traveling unit 401 can also output auxiliary traction force to compensate for the thrust generated by the pushing mechanism 3, thereby working together to ensure that the carriage is moved smoothly and reliably.

[0036] Please see Figure 2 and Figure 7It should be noted that the rear of the steel frame mainboard 10102 of base 1 can be equipped with a battery and communication module (i.e., the part marked by solid line box III), which is used to provide power for the entire device and realize remote control function. This design allows operators to operate the device from a safe distance, which not only fundamentally eliminates the safety risks of personnel entering the track operation area, but also ensures that the device will not interfere with the normal operation of other tasks in the track area during operation.

Claims

1. A railway freight car propulsion device, characterized in that, include: The base (1), lifting and unfolding mechanism (2), pushing mechanism (3), and traveling mechanism (4) are provided. The base (1) includes a fixed seat (101) and a longitudinal adjustment seat (102). The fixed seat (101) includes a vertical plate (10101) and a steel frame main plate (10102) for mounting the traveling mechanism (4). The longitudinal adjustment seat (102) includes a sliding partition (10201) and a front fork bracket (10202) connected thereto. The vertical plate (10101) and the sliding partition (10201) are fixedly connected by bolts through corresponding elongated holes to realize the longitudinal position adjustment of the longitudinal adjustment seat (102) relative to the fixed seat (101). The lifting and unfolding mechanism (2) is connected to the fork of the front fork bracket (10202). The device is located at a position where its height and width can be adjusted. It includes a support frame (201), a lifting component (202), and a folding component (203). The pushing mechanism (3) is connected to the lifting and folding mechanism (2) and is used to contact and push the wheels of the carriage. The traveling mechanism (4) is installed on the steel frame main board (10102) of the base (1) and is used to drive the entire device to move along the track. The height adjustment of the lifting and folding mechanism (2) can be achieved by adjusting the position of the longitudinal adjustment seat (102) and driving the lifting component (202), which simultaneously drives the pushing mechanism (3) to adjust its height. The width adjustment of the lifting and folding mechanism (2) can be achieved by driving the folding component (203), which simultaneously drives the pushing mechanism (3) to adjust its width.

2. The railway freight car propulsion device according to claim 1, characterized in that: The fork bracket (10202) has a combination structure of slide rail (5) and slider (6) on the inner side of the fork opening. The support frame (201) of the lifting and unfolding mechanism (2) is connected to the combination structure through its front and rear outer sides to achieve longitudinal sliding.

3. The railway freight car propulsion device according to claim 1, characterized in that: The lifting component (202) includes two electric push rods (20201) and a top block (20202). The electric push rods (20201) are arranged on the front fork bracket (10202) and act on the top block (20202). The rear outer side of the support frame (201) is provided with a top groove structure that is adapted to the top block (20202). The top block (20202) is pushed against or disengaged from the top groove by the extension and retraction of the electric push rods (20201), thereby realizing the lifting and unfolding mechanism (2).

4. The railway freight car propulsion device according to claim 1, characterized in that: The folding / unfolding component (203) includes a power unit (20301), two lead screws (20302), and two lead screw sleeves (20303). The power unit (20301) includes a servo motor (2030101), a bevel gear (2030102), and two cylindrical bevel gears (2030103). The servo motor (2030101) drives the bevel gears (2030102), which in turn drives the two cylindrical bevel gears (2030103) and their connected components. Two lead screws (20302) rotate synchronously; two lead screw sleeves (20303) respectively cooperate with the two lead screws (20302) and are connected to the left and right ends of the front inner side of the support frame (201); the lead screw sleeves (20303) are connected to the push mechanism (3) on the opposite side of their mating surface with the front inner side of the support frame (201); the rotation of the lead screws (20302) drives the lead screw sleeves (20303) to generate lateral displacement, so as to drive the push mechanism (3) to adjust the width.

5. The railway freight car propulsion device according to claim 1, characterized in that: The support frame (201) has slide rails (5) arranged laterally on its front and rear inner sides. Each slide rail (5) has a slider (6) installed at both ends. The slider (6) is connected to the pushing mechanism (3).

6. The railway freight car propulsion device according to claim 1, characterized in that: The pushing mechanism (3) includes two symmetrically arranged pushing units (301). Each pushing unit (301) includes a frame (30101), a high-torque motor (30102), an active friction wheel (30103), two passive friction wheels (30104), and a support wheel (30105). The active friction wheel (30103) is driven by the high-torque motor (30102), and its gear end meshes with the gear ends of the two passive friction wheels (30104) to form a transmission chain. One of the passive friction wheels (30104) is used to contact and drive the carriage wheels, and the other passive friction wheel (30104) and the support wheel (30105) together provide support for the frame (30101).

7. The railway freight car propulsion device according to claim 6, characterized in that: The active friction wheel (30103) and the two passive friction wheels (30104) are arranged in a triangle.

8. The railway freight car propulsion device according to claim 1, characterized in that: The traveling mechanism (4) includes two traveling units (401) arranged in front and behind, which provide auxiliary traction during propulsion operations.

9. The railway freight car propulsion device according to claim 1, characterized in that: The base (1) has a battery and communication module at the rear of its steel frame main board (10102) for providing power to the device and enabling remote control.

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