Fairing for heavy haul train and operation method thereof

Abstract

The invention relates to the technical field of traffic transportation, in particular to a fairing for a heavy-load train and an operation method thereof.The fairing assembly comprises a fairing body, and the fairing body comprises a main body part which is arranged in a local area of the top of the heavy-load train; wherein the main body part is pivotally arranged on the heavy-load train, so that the main body part can be pivotally opened under the action of self weight under the condition that a compartment of the heavy-load train is overturned for unloading. By means of the structure, the phenomena of coal dust raising and the like caused by negative pressure around the heavy-load train, vortex and the like when the heavy-load train enters the tunnel can be restrained in the mode that the fairing is arranged.

Description

Technical Field

[0001] The present invention relates to the technical field of transportation, and in particular provides a fairing (self-dumping fairing) for a heavy-load train and an operating method thereof. Background Art

[0002] As an energy source, coal is widely used in industries such as heating and electricity. Currently, the main method of transporting coal is by rail. According to relevant engineering experience, when heavy-loaded railway trains transporting coal enter tunnels, sudden changes in the operating blockage ratio will cause adverse flow field effects such as vortices and negative pressure effects in the area around the vehicle. Coal has a relatively loose and broken texture, and under the action of the above-mentioned flow field effects, it is very easy to cause coal dust to be raised. Specifically, the coal dust particles in the coal are easily lifted and moved with the pressure fluctuations and piston wind in the tunnel, which will pollute the environment in the tunnel, thereby increasing the operation and maintenance costs of the tunnel and posing certain hidden dangers to driving safety. In addition, due to the movement of coal dust particles, it is obvious that there will also be a corresponding waste of the coal to be transported.

[0003] When heavy-load trains enter tunnels, the coal is exposed to intense negative pressure, and a small vortex of air forms on the roof of the train. This causes loose coal chunks and slag to be "sucked up" and flung into the air. Driven by piston wind, these loose coal chunks and slag are transported, generating coal dust. To address this issue, methods are often employed to modify the stacking properties of the coal, such as spraying dust suppressants or watering the coal surface on the roof of the train. While these methods can help mitigate coal dust, actual line operation shows that the coal crust formed on the roof of the train often cracks and breaks due to the long-term vibration of the heavy-load train during transportation. This damaged crust is unable to effectively encapsulate the underlying coal layer, causing coal dust to continue to occur. Coal dust emission is particularly severe when heavy-load trains enter long tunnels. In the aforementioned method for modifying the stacking properties of coal materials, spraying water on the coal surface at the top of the car can indeed suppress coal dust to a certain extent in the initial stage. However, as the transportation distance increases, the water sprayed on the top of the coal gradually evaporates. Therefore, the sustainability of this dust suppression method needs to be further improved. In general, additional dust suppression measures are required in addition to this method to achieve the desired effect.

[0004] Therefore, this patent proposes to set up an aerodynamic fairing on the top of the heavy-load train car to suppress the coal dust dust phenomenon.

[0005] The present invention employs a fairing installed on the roof of a heavy-haul train. This, on the one hand, physically isolates the coal's free-surface surface from the vortex in the overhead flow field, effectively suppressing coal dust emission. Furthermore, the design of the fairing improves the flow field distribution around the heavy-haul train, thereby suppressing the dust-generating effects that cause coal dust emission.

[0006] Main reference Figure 3 and Figure 4 , according to relevant experience, when heavy-load trains partially enter the tunnel ( Figure 3 ) and full entry into the tunnel ( Figure 4 ), the top space near the front end of the car body of the heavy-loaded train is one of the main dust-generating locations. Therefore, the dust-generating locations of the top space at the front end of the car body can be analyzed, and on this basis, a fairing can be configured for at least this part of the heavy-loaded train. The method of covering a part of the top area of the heavy-loaded train with a fairing has the following advantages. On the one hand, it will obviously save the material cost of the fairing and the transportation energy consumption (the energy consumption of the heavy-loaded train during acceleration is related to the weight of the vehicle. Although the fairing in the present invention is made of a lighter material, considering that the heavy-loaded train has a large number of carriages, the complete layout of the fairing will significantly increase the overall vehicle weight, so it will cause an increase in traction during the acceleration of the vehicle, and the energy consumption will also increase accordingly). On the other hand, during the process of unloading and flipping the carriage, the falling space reserved for the vertical fairing is saved.

[0007] By designing the fairing structure to improve the flow field distribution around heavy-haul trains, for example, reference can be made to the design experience of high-speed train top fairings. The raised fairing can optimize the turbulence effect of the flow field in the top space of the carriage. For heavy-haul trains, the rational design of the shape of the local fairing configured in the top area of the heavy-haul train can effectively isolate the coal's free surface from the top flow field, improve the top flow field, and realize non-manual automatic opening and closing of the car cover, which can improve the environmental friendliness and safety of heavy-haul train transportation, while also greatly facilitating the coal loading and unloading process.

[0008] Accordingly, this field requires a new technical solution to solve the above problems. Summary of the Invention

[0009] The present invention is proposed to solve the above technical problems at least to a certain extent and / or to solve at least a part of the above technical problems.

[0010] In a first aspect, the present invention provides a fairing for a heavy-load train, the fairing comprising a main body portion, the main body portion being arranged in a local area of the top of the heavy-load train; wherein the main body portion is pivotally arranged on the heavy-load train so that: when a carriage of the heavy-load train is overturned for unloading, it can pivot open under the action of its own weight.

[0011] With this configuration, it is possible to suppress dust emission and the like caused by heavy-load trains.

[0012] Regarding the above-mentioned fairing, in a possible implementation manner, the fairing is provided in a local area close to the front portion of the top area of the vehicle compartment.

[0013] Through such a structure, a possible orientation for locally arranging the fairing in the carriage of a heavy-load train is provided.

[0014] Regarding the above-mentioned fairing, in one possible embodiment, the heavy-load train includes at least one carriage. When the carriage includes multiple carriages, the fairing is provided in a local area of each carriage in at least a portion of the multiple carriages.

[0015] Through such a structure, a possible way of partially arranging fairings on the entire vehicle of a heavy-load train is provided.

[0016] For the fairing, in a possible embodiment, when the carriage of the heavy-load train is overturned for unloading, the center of gravity of the main body is located on the side of the carriage close to the heavy-load train (inside the car body).

[0017] With such a structure, a possible weight distribution mode is provided when the fairing is installed on a heavy-load train.

[0018] For the above-mentioned fairing, in a possible implementation manner, the thickness of the main body portion along the vehicle length direction is different.

[0019] With such a structure, a possible thickness distribution mode is provided when the fairing is installed on a heavy-load train.

[0020] For the above-mentioned fairing, in a possible implementation manner, the center distance of the fairing when flipped is less than 1 / 2 of the length of the carriage.

[0021] Such a structure provides a possible form of turning space for the fairing when it is installed on a heavy-load train.

[0022] Regarding the above-mentioned fairing, in a possible implementation manner, the fairing is a straight structure extending along the length direction of the vehicle.

[0023] For the above-mentioned fairing, in a possible embodiment, the fairing has a raised portion at least near the head of the car body, such as the teardrop streamlined structure shown in the embodiment or other structural forms with a raised portion near the head of the car body. Exemplarily, the fairing is a combination of a relatively flat straight portion / arc-shaped portion / folded surface combination and a significantly convex arc-shaped portion / folded surface combination.

[0024] For the fairing, in a possible implementation, the main body is made of the same steel material as the vehicle body; or the main body is made of carbon fiber.

[0025] Through such a structure, possible structural forms / materials of the main body are given.

[0026] In a second aspect, the present invention provides a method for operating a fairing for a heavy-load train, the method comprising the following steps: flipping the carriage of the heavy-load train downward to unload cargo, the fairing pivoting open relative to the carriage by means of the downward flipping, and when the fairing is pivoted open, the center of gravity of the fairing is on the inner side of the carriage along the length direction; and / or flipping the carriage of the heavy-load train upward to place it in a state where cargo can be loaded, the fairing pivoting closed relative to the carriage by means of the upward flipping, and when loading is required, the fairing is kept in the pivoted closed state.

[0027] With this configuration, the cowl can be automatically opened and closed during loading and unloading.

[0028] In addition, it can be understood that this method has all the technical effects of the fairing for heavy-load trains described in any of the above items, which will not be described in detail here.

[0029] For example, although existing heavy-load trains carrying coal have implemented certain coal dust suppression measures, the dust suppression effect is general and the related dust suppression measures often consume a lot of resources. In addition, most of the existing coal dust suppression methods for heavy-load trains are to suppress dust by modifying the properties of coal materials. Its effect is mainly limited to a single transportation. Therefore, after the next coal loading is completed, the relevant dust suppression measures need to be repeated. In addition, for dust suppression measures such as covering the top of the car body with tarpaulins, it is also necessary to consider the removal and installation of dust suppression measures on the top of the car body during the overturning of the car body during loading and unloading of heavy-load trains, which increases labor costs. In addition, the existing dust suppression measures have not formed an optimized flow field around the heavy-load train, which suppresses the relevant treatment ideas for coal dust.

[0030] Accordingly, the present invention mainly provides a fairing on a heavy-load train, and designs the geometric form, distribution position, and connection form between the fairing and the heavy-load train carriage, thereby isolating the coal-facing surface in the car body from the tunnel flow field to a certain extent, thereby effectively suppressing the phenomenon of coal dust emission during the heavy-load train passing through the tunnel (including four states: partial entry, full entry, partial departure, and full departure. For the analysis in the previous article, the states mainly involved are the first two states). By designing the geometric dimensions such as the shape, area, length, and thickness of the fairing, and designing the material of the fairing structure and its connection nodes, it is ensured that during the process of loading and unloading coal by the heavy-load train, the fairing before and after the car body flips can be opened and returned to its original position with its own weight. In this way, while effectively suppressing the phenomenon of coal dust emission by improving the flow field around the car, it also ensures the automatic flipping of the fairing during the loading and unloading process.

[0031] In a preferred embodiment of this application, a self-unloading fairing is installed on the top of the coal car of a heavy-haul train. This, combined with the fairing's ability to isolate the coal's exposed surface and optimize the flow field around the car, reduces the likelihood of coal dust being generated during tunnel transport. Furthermore, the hinged connection between the fairing and the end of the heavy-haul train body allows the car to automatically open and reposition during loading and unloading. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 A schematic structural diagram of a heavy-load train including a fairing according to an embodiment of the present invention is shown;

[0034] Figure 2 A schematic structural diagram (top view) showing a fairing for a heavy-load train according to an embodiment of the present invention;

[0035] Figure 3 A schematic diagram showing the principle of eddy current effects when a heavy-load train partially enters a tunnel;

[0036] Figure 4 A schematic diagram showing the principle of eddy current effect when a heavy-load train fully enters a tunnel without a fairing;

[0037] Figure 5A schematic diagram showing the principle of eddy current effect when a heavy-load train is fully entering a tunnel and a fairing is provided;

[0038] Figure 6 A schematic diagram showing the structure of a heavy-load train including a fairing according to an embodiment of the present invention is shown. Figure 1 ,The fairing in the figure is a water drop streamlined fairing;

[0039] Figure 7 A schematic diagram showing the structure of a heavy-load train including a fairing according to an embodiment of the present invention is shown. Figure 2 , the fairing in the figure is a straight fairing; and

[0040] Figure 8 A schematic diagram showing the fitting state of a fairing for a heavy-load train and coal in a carriage according to an embodiment of the present invention is shown.

[0041] In the attached figure:

[0042] 1. Carriage;

[0043] 2. Hinge point;

[0044] 3a, water drop streamlined fairing;

[0045] 3b, straight fairing;

[0046] 4. Coal open area. DETAILED DESCRIPTION

[0047] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0048] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention.

[0049] It will be understood by those skilled in the art that, unless expressly stated otherwise, the singular forms "a", "an", "said" and "the" used herein may also include the plural forms. It should be further understood that the term "comprising" used in the description of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element, or there may be intermediate elements. In addition, "connected" or "coupled" as used herein may include wireless connections or couplings. The term "and / or" used herein includes any unit and all combinations of one or more associated listed items.

[0050] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art in the art to which the present invention pertains. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art and, unless defined as such herein, will not be interpreted in an idealized or overly formal sense.

[0051] In addition, numerous specific details are provided in the following detailed description to better illustrate the present invention. Those skilled in the art will appreciate that the present invention may be practiced without some of these specific details. In some instances, principles for optimizing flow field parameters, which are well known to those skilled in the art, are not described in detail in order to highlight the main points of the present invention.

[0052] Refer to the following Figures 1 to 8 At least a part of the present invention is used to illustrate the present invention.

[0053] Main reference Figure 1 、 Figure 2 、 Figure 6 、 Figure 7 and Figure 8 In one possible embodiment, a fairing for a heavy-load train mainly includes a main body portion, which is arranged in a local area on the top of the heavy-load train car 1, and the main body portion is pivotally arranged on the heavy-load train. For example, a hinge point 2 is provided on the heavy-load train, and the main body portion of the fairing is pivotally arranged on the heavy-load train at a position corresponding to the hinge point. In this way, when the heavy-load train car is overturned for unloading, it can be pivoted open under the action of its own weight. In this embodiment, two types of fairing structures are shown (a water drop streamlined fairing 3a and a flat fairing 3b). The following mainly uses the water drop fairing 3a as an example for explanation.

[0054] 1. Structural design of the fairing

[0055] Among them, the structural design of the fairing mainly includes the design of its geometric shape, its connection with the vehicle, and the flipping space.

[0056] (1) Design of the basic geometric shape of the fairing

[0057] The geometry of the fairing is smaller than the length of the car in the length direction. This is because the spatial distribution of the top flow field under tunnel operation conditions shows that the dust generation caused by the vortex is concentrated in the part near the front end of the car. Therefore, the roof fairing also needs to cover the top of the coal at the front end of each coal car, and its width is consistent with the width of the car interior. In the thickness direction, the top surface of the coal in the train is usually not completely horizontal after loading. In the mileage direction, the cross section near the middle mileage is relatively full, the accumulation surface on both sides is low, and the reserved space on the top is large. This design allows the bottom of the fairing to better fit the accumulation shape of the coal, thereby achieving coal compaction (refer to Figure 8 ).

[0058] (2) Detailed geometric design of the fairing

[0059] Once the overall shape of the fairing is determined, its detailed structure can be further optimized. The fairing can be designed as a flat plate, filling the space between the free-flowing surface of the coal-carrying carriage and the roof, reducing some turbulence. If the roof space meets the line's constraints, the fairing can also be designed with a streamlined, teardrop-like shape, significantly reducing turbulence on the carriage roof.

[0060] (3) Connection design between fairing and carriage

[0061] The end of the fairing is hinged to the front baffle of the heavy-load train carriage, which can realize the opening and closing of the fairing under the action of its own weight during the upside-down flipping of the carriage. Here, the fairing needs to be processed with different thicknesses so that during the flipping process, the structural center of gravity of the fairing at each rotation position is located inside the carriage, so that after the carriage is flipped twice, the fairing can rotate in the opposite direction and return to its original position under the action of its own weight (refer to Figure 1 From a mechanical perspective, the hinge joint must meet the dynamic and static strength requirements for the fairing's own weight. These include maintaining balance when the car is inverted and combined with the unloading and lifting system, ensuring the centroid distance during rotation is less than half the car length, and ensuring that the fairing / hinge point / limiter can meet dynamic impact requirements during dynamic movement.

[0062] (4) Design of the turning space related to loading / unloading of the carriage

[0063] The fairing falls due to its own weight during the process of flipping and unloading the car body, so that the space occupied by the car body in the vertical direction is larger. The vertical space limit of the car body after flipping is positively correlated with the design length of the fairing. In addition, for heavy-duty lines with roof fairings installed, it is necessary to reserve space for the fairing to fall during the loading and unloading process, and the design length of the fairing should not be too long. Specifically, the design that should not be too long echoes the local design concept of this application. Specifically, on the one hand, the local design is the preferred solution obtained after the eddy current analysis of heavy-duty trains (the result of eddy current analysis). On the other hand, the local design is also a feasible solution that is compatible with limited space (the demand for limited space). In this way, the combination of the pivot setting and the local layout makes the layout scheme of this application feasible when applied to heavy-duty trains.

[0064] (5) Material design of fairing

[0065] The material of the fairing can be the same steel material as the carriage. Considering the bulk density of heavy-load trains, high-strength, high-wear-resistant, high-corrosion and low-bulk density materials such as carbon fiber materials can also be selected.

[0066] It should be noted that when the dust suppression method of the present application is actually applied to a heavy-load railway line, each carriage needs to be modified accordingly. For example, for heavy-load trains, the train often contains more carriages, so the modification workload is large, such as the layout of the hinge point 2 of the carriage 1, the layout of the fairing rotation limiter, the factory prefabrication and on-site installation of the fairing, etc. However, this method of using a roof fairing has the advantage of being a one-time solution to dust suppression to a certain extent (compared to the traditional dust suppression method, dust suppression treatment is required after each coal loading is completed). Therefore, from a long-term perspective, the dust suppression measure using a fairing has a clear application prospect.

[0067] 2. Parameter design of fairing

[0068] In order to ensure the feasibility of adding a self-unloading fairing on the top of the heavy-load train carriage, the design parameters that need to be considered mainly include:

[0069] (1) According to the distribution of top flow field parameters when a heavy-loaded train passes through a tunnel, the length of the fairing is designed to cover the adverse flow field along the entire length direction.

[0070] (2) Based on the length of the fairing and the shape of the coal accumulation in the space of this length, the shape of the bottom of the fairing is reasonably designed to ensure that it fits the coal free surface 4 as much as possible. Since the coal accumulation is low at both ends and high and straight in the middle in the length direction, the fairing is designed as a convex streamlined structure at the end of the carriage and a straight structure near the midpoint of the carriage, which can achieve a better fit with the coal layer (refer to Figure 8 ).

[0071] (3) Select reasonable fairing materials and calculate the rotation of the fairing during the up / down flipping of the car body. For example, based on the dynamic analysis and static analysis of the fairing during the flipping process, it can be ensured that under various flipping conditions, the center distance of the fairing flip is always less than half the car length (1 / 2 of the car body length) to ensure that the fairing can be unloaded and returned to its original position.

[0072] 3. How to use the fairing

[0073] The specific use of the fairing of the present invention is described below with reference to three scenarios: loading coal onto a heavy-load train, transporting coal on a tunnel line by a heavy-load train, and unloading coal from a heavy-load train.

[0074] (1) During the process of loading coal onto a heavy-load train, the fairing is placed stably on the top of the heavy-load train carriage, and coal is loaded at the opening position. For example, there are coal leveling / vibrating compaction equipment at the loading / unloading position to ensure the coal loading filling degree of the fairing, such as the contact and compaction of the car body / fairing with the coal.

[0075] (2) When a heavy-loaded train passes through a tunnel, when the heavy-loaded train partially enters the tunnel, negative pressure and eddy currents are likely to occur on the roof of the train outside the tunnel and on the top of the train inside the tunnel near the front of the train. At this time, the fairing can effectively isolate the coal from the bad flow field and optimize the roof flow field. When a heavy-loaded train completely enters the tunnel, negative pressure and eddy currents are likely to occur on the roof of the train inside the tunnel near the front of the train and on the rear of the train. At this time, the fairing can effectively isolate the coal from the bad flow field and optimize the roof flow field (refer to Figures 3 to 5 ).

[0076] Specifically, the eddy current effect is primarily related to the geometry of the flow field between the train and the tunnel. From an engineering perspective, the flow field optimization is primarily achieved through train modification and shape optimization. However, due to mandatory requirements such as line limits, the optimization of the train body and flow field shape during the installation of fairings is limited, so the eddy current effect only has a mitigating effect. Combined with the fairing's ability to isolate the free surface of the coal deposit from the eddy currents, the overall effect is a reduction in coal dust emission.

[0077] (3) After the heavy-loaded train arrives at the unloading location, the car body is flipped up and down with the help of mechanical clamps. At this time, the fairing falls under the action of its own weight, and the center of gravity of the fairing is located between the head and tail of the car (inside the car). After the second flip, the car is in the forward direction, and the fairing is rotated back to its original position. In this way, subsequent coal loading can continue.

[0078] It can be seen that in the preferred embodiment of the present application, by providing a fairing on the top of the carriage of the heavy-load train, the effects that can be achieved mainly include:

[0079] 1. Improve the flow field around the train to suppress coal dust. Specifically, the fairing blocks the typical vortex flow on the coal-facing surface after the heavy-load train enters the tunnel. At the same time, the fairing improves the flow field parameter distribution on the top of the heavy-load train, effectively reducing the vortex effect. The combined effect of these two factors achieves the coal dust suppression effect.

[0080] 2. Automatic opening and closing of the fairing during loading and unloading. Specifically, during the process of turning over the carriage to unload and return to its original position, the fairing can automatically open and close under the action of its own weight. Compared with traditional dust suppression measures (such as applying tarpaulins after each loading is completed), this greatly reduces the workload.

[0081] 3. Optimize space. Specifically, during coal unloading, space must be reserved for the fairing to fall. By designing the fairing to cover a portion of the coal on the top of the car, the required space can be reduced. Furthermore, by optimizing the connection between the fairing and the car, space utilization can be further optimized.

[0082] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A fairing for a heavy-load train, characterized in that: The fairing includes a main body portion, and the main body portion is arranged in a local area of the top of the heavy-load train; The main body is pivotally mounted on the heavy-load train so as to: In the event that a carriage of the heavy-load train is turned over to unload cargo, it can be pivoted open under the effect of its own weight.

2. The fairing for heavy-load train according to claim 1, characterized in that: The fairing is provided in a local area close to the front portion of the roof area of the vehicle compartment.

3. The fairing for heavy-load train according to claim 2, characterized in that: The heavy-load train comprises at least one carriage, In the case that the carriage includes multiple sections, in at least a portion of the multiple sections, a local area of each section of the carriage is provided with the fairing.

4. The fairing for heavy-load train according to claim 3, characterized in that: When the carriage of the heavy-load train is overturned to unload cargo, the center of gravity of the main body is located on the side of the carriage close to the heavy-load train.

5. The fairing for heavy-load train according to claim 4, characterized in that: The thickness of the main body portion varies along the vehicle length direction.

6. The fairing for heavy-load train according to claim 3, characterized in that: The center distance of the fairing flipping is less than 1 / 2 of the length of the carriage.

7. The fairing for heavy-load train according to claim 3, characterized in that: The fairing is a straight structure extending along the length of the vehicle.

8. The fairing according to claim 3, characterized in that: The fairing has a convex portion at least at a position close to the head of the vehicle body.

9. The fairing according to claim 1, characterized in that The material of the main body is the same steel material as the carriage; or The main body is made of carbon fiber material.

10. A method for operating a fairing for a heavy-load train, characterized in that: The method comprises the following steps: The carriage of the heavy-load train is turned downward to unload the goods, and the fairing is pivoted open relative to the carriage by means of the downward turning, and When the fairing is pivoted open, the center of gravity of the fairing is located inside the vehicle compartment along its length; and / or The carriage of the heavy-load train is turned upward to be in a state where it can be loaded with cargo, and the fairing is pivoted and closed relative to the carriage by means of the upward turning, and In the case of needing to load cargo, the fairing is kept in the pivoted closed state.

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