Low-altitude heavy-load transportation airship and buoyancy control method in loading and unloading processes

Abstract

The invention discloses a low-altitude heavy-load transportation airship and a buoyancy control method in the loading and unloading process, and belongs to the technical field of heavy-load transportation aircrafts. Comprising a bag body filled with buoyancy gas, a high-pressure air bag and an air bag which are located in the bag body, a pressure control system used for controlling the high-pressure air bag and the air bag to be inflated and deflated and a flight control system used for controlling the pressure control system to act, the density of the buoyancy gas is smaller than that of air, and the pressure control system comprises a first pressure control system and a second pressure control system; the first pressure control system controls buoyancy gas to flow into or out of the high-pressure air bag. The second pressure control system controls external air to flow into or out of the air bag. The flight control system is in signal connection with the first pressure control system and the second pressure control system. The buoyancy and gravity of the airship are adjusted by inflating and deflating the high-pressure air bag and / or the air bag, so that the problem that the airship rises rapidly due to the fact that the net buoyancy of the airship is increased sharply during cargo unloading is solved, and flight safety is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of heavy-load transport aircraft, and in particular to a low-altitude heavy-load transport airship and a buoyancy control method during loading and unloading. Background Art

[0002] Low-altitude, high-load transport airships have demonstrated unique advantages in responding to potential conflicts in various strategic directions, handling emergencies, and performing diverse military missions and large-scale combat support. They can transport a large number of personnel and equipment to remote or disaster-stricken areas in a short period of time, improving emergency response speed. At the same time, their unrestricted nature enables them to deliver materials and transport personnel in complex terrain areas.

[0003] Low-altitude, high-load transport airships have the ability to stay in the air for a long time and can provide logistical support for sustained operations. Compared with traditional transport aircraft, transport airships have a smaller radar cross-section, which is conducive to performing covert missions. These characteristics make transport airships an important force to supplement the existing military transport system and significantly enhance my country's national defense strength and emergency response capabilities.

[0004] Currently, there is limited air transport capacity with large load, long range, roll-on / roll-off capability, and suitable for transporting large equipment. There are high requirements for the shipping dimensions and airport support capabilities. The lack of carriers seriously restricts the strategic delivery capabilities of aviation. Low-altitude, large-load transport airships can transport tens to hundreds of tons of cargo at a time, with a capacity far exceeding that of ordinary transport aircraft. The flexible take-off and landing characteristics that do not rely on traditional airports greatly expand the reachable range. Low-altitude, large-load transport airships can carry oversized or special-shaped cargo, filling the capacity gap of existing transport vehicles.

[0005] As a new type of low-altitude heavy-load transport tool, low-altitude heavy-load transport airship has unique advantages in point-to-point transportation, realizing direct transportation from factory to destination, reducing transit links, and improving transportation efficiency. The main reason hindering the development of low-altitude heavy-load transport airships is that the airship suddenly loses its load gravity during the unloading process, causing the buoyancy of the airship to be much greater than the gravity, causing the airship to rise rapidly. Therefore, it is a technical problem that technicians in this field need to solve urgently to propose a low-altitude heavy-load transport airship and a buoyancy control method for the loading and unloading process, so as to improve the air carrying capacity of heavy-load transport tools. Summary of the invention

[0006] The purpose of the present invention is to provide a low-altitude heavy-load transport airship and a buoyancy control method for the loading and unloading process in view of the defects and shortcomings in the prior art, so as to solve the problem that the buoyancy of the airship is much greater than the gravity due to the sudden loss of load gravity during the unloading process, causing the airship to rise rapidly.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] The present invention provides a low-altitude large-load transport airship, comprising a main bladder filled with buoyancy gas, a high-pressure airbag and an air bag located in the main bladder, a pressure control system for controlling the inflation and deflation of the high-pressure airbag and the air bag, and a flight control system for controlling the action of the pressure control system, wherein the density of the buoyancy gas is less than that of air, the pressure control system comprises a first pressure control system and a second pressure control system, the first pressure control system controls the buoyancy gas to flow into or out of the high-pressure airbag, and the second pressure control system controls the outside air to flow into or out of the air bag; the flight control system is respectively connected to the first pressure control system and the second pressure control system by signals.

[0009] Preferably, the main capsule is made of a high-strength skin material, and the surface of the skin material is coated with a coating containing a nano-scale ultraviolet absorber, a silicone composite material and a heat-sensitive material.

[0010] Preferably, the low-altitude, high-load transport airship comprises two symmetrically distributed main bladders, and the two main bladders are interconnected to form an integral structure.

[0011] Preferably, the first pressure control system comprises a compressor, a first pressure sensor, a first valve and a first controller, the first pressure sensor and the first valve are installed on the high-pressure airbag, the compressor is installed on the outside of the high-pressure airbag, the first pressure sensor is connected to the flight control system by signal, the first controller is connected to the flight control system, the compressor and the first valve by signal respectively, the flight controller sends an instruction to the first controller according to the value detected by the first pressure sensor, and the first controller controls the opening and closing of the first valve and the compressor according to the instruction sent by the flight controller;

[0012] The second pressure control system includes a blower, a second pressure sensor, a second valve and a second controller. The second pressure sensor and the second valve are installed on the air bag, and the blower is installed on the outside of the air bag and the main bag body. The second pressure sensor is connected to the flight control system signal, and the second controller is respectively connected to the flight control system, the blower and the second valve signal. The flight controller sends instructions to the second controller according to the value detected by the second pressure sensor, and the second controller controls the opening and closing of the second valve and the blower according to the instructions sent by the flight controller.

[0013] Preferably, it also includes a propulsion device for providing lift and adjusting the pitch and heading attitude, an energy supply device for providing energy, a pod for carrying personnel, equipment and cargo, a buffer device for mitigating the impact of touching the ground during landing, and a tail wing for providing pitch, yaw and roll directional stability.

[0014] Preferably, the propulsion device is a high-power power device and a high-efficiency propeller, and the high-power power device and the high-efficiency propeller are respectively installed at the front, left and right sides and tail of the low-altitude large-load transport airship;

[0015] The propulsion device includes a vertical propulsion device and a horizontal propulsion device. The vertical propulsion device is installed on the side of the hull, and the horizontal propulsion device is installed on the front and rear of the hull.

[0016] Preferably, the buffer device comprises a buffer air cushion arranged at the main bag and / or the bottom of the pod, and the buffer air cushion has at least two independent modular components, and each of the modular components has independent inflation, deflation and pressure regulation functions.

[0017] Preferably, the low-altitude, high-load transport airship is provided with at least two tail fins, which are installed at the rear of the airship and arranged in an X shape.

[0018] The present invention also provides a buoyancy control method for a low-altitude, high-load transport airship during loading and unloading, comprising the following contents:

[0019] After the cargo is loaded, the buoyancy gas inside the high-pressure airbag is released into the main bag, and the air inside the airbag is released into the external environment, increasing the buoyancy of the low-altitude and heavy-load transport airship, reducing the gravity of the low-altitude and heavy-load transport airship, and cooperating with the lift generated by the propulsion device to complete the takeoff, rise to the cruising working altitude, and start level flight transportation;

[0020] During level flight, the flight control system and pressure control system intelligently adjust the flight speed and the air quality in the air bag according to the fuel consumption to maintain the flight altitude.

[0021] Before landing, the first pressure control system compresses the buoyancy gas in the main bag and fills it into the high-pressure airbag, and the second pressure control system fills the airbag with outside air to reduce the buoyancy of the low-altitude and heavy-load transport airship, increase the gravity of the low-altitude and heavy-load transport airship, and reduce the flight altitude of the low-altitude and heavy-load transport airship to a safe hovering altitude;

[0022] During the process of releasing the load, the first pressure control system continuously compresses the buoyancy gas and fills it into the high-pressure airbag, and the second pressure control system continuously fills the airbag with outside air to prevent a surge in net buoyancy caused by unloading the cargo.

[0023] Preferably, when the above method cannot completely overcome the sharp change in net buoyancy caused by unloading of cargo, a downward pressure propulsion device for generating downward pressure is installed on the main bladder, the downward pressure propulsion device is started, and the airship is pressed down to a safe hovering height by combining continuous downward pressure of the downward pressure propulsion device and adjustment of the airship's own buoyancy.

[0024] Compared with the prior art, the present invention has achieved the following beneficial effects:

[0025] 1. The present invention arranges a high-pressure airbag and an air bag in the main bag body, and the first pressure control system controls the buoyancy gas in the main bag body to flow into or out of the high-pressure airbag, and the second pressure control system controls the air in the external environment to flow into or out of the air bag. When the load gravity of the airship changes, the buoyancy gas is pressed into the high-pressure airbag or the buoyancy gas in the high-pressure airbag is released, and / or air is filled into the airbag or the air in the airbag is released. The buoyancy and gravity of the low-altitude heavy-load transport airship are adjusted to avoid the problem of rapid ascent of the airship and ensure flight safety.

[0026] Other technical solutions of the present invention have achieved the following beneficial effects compared with the prior art:

[0027] 2. The present invention coats a coating containing nano-scale ultraviolet absorbers, silicone composite materials and thermosensitive materials on the surface of the skin material constituting the main capsule. The coating material can prevent ultraviolet rays and corrosion, and has the function of automatically adjusting the surface temperature according to the external ambient temperature. It can effectively reduce the impact of temperature changes on the performance of the main capsule material and the impact of temperature changes on the internal gas pressure. At the same time, it solves the impact of the large temperature difference between day and night on the gas pressure of long-flight airships, and brings better flight performance to long-flight airships.

[0028] 3. The present invention installs a high-power downward pressure propulsion device on the main bladder, so that the downward force generated by the downward pressure propulsion device is coordinated with the airship's own buoyancy adjustment method, so that when the airship's own buoyancy adjustment alone cannot overcome the sharp change in net buoyancy caused by cargo unloading, the airship can hover at a suitable hovering height to meet the mission requirements during heavy-load transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. 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 creative labor.

[0030] Figure 1 It is a schematic diagram of the axle side structure of a low-altitude, high-load transport airship disclosed in a specific embodiment of the present invention;

[0031] Figure 2 It is a schematic diagram of a top view of a low-altitude, high-load transport airship disclosed in a specific embodiment of the present invention;

[0032] Figure 3 It is a schematic diagram of the side structure of a low-altitude, high-load transport airship disclosed in a specific embodiment of the present invention;

[0033] Figure 4 The present invention discloses a design diagram of a low-altitude, high-load transport airship that can stay in the air throughout its flight, according to a specific embodiment of the present invention.

[0034] Among them, 1. Main bladder body; 2. Propulsion device; 3. Tail wing; 4. High-pressure airbag; 5. Air bag; 6. Buffer air cushion; 7. Blower; 8. Compressor; 9. Coating. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] like Figures 1 to 3 As shown, the present invention provides a low-altitude heavy-load transport airship, comprising a main bladder 1 filled with buoyancy gas, a high-pressure airbag 4 and an airbag 5 located in the main bladder 1, a pressure control system for controlling the inflation and deflation of the high-pressure airbag 4 and the airbag 5, and a flight control system for controlling the action of the pressure control system, the density of the buoyancy gas is less than that of air, the pressure control system comprises a first pressure control system and a second pressure control system, the first pressure control system controls the flow of buoyancy gas into or out of the high-pressure airbag 4, and the second pressure control system controls the flow of outside air into or out of the airbag 5; the flight control system is connected to the first pressure control system and the second pressure control system by signal. When the buoyancy and gravity of the low-altitude heavy-load transport airship need to be adjusted, the flight control system sends a signal to the first pressure control system and / or the second pressure control system to fill gas into the high-pressure airbag 4 and / or the airbag 5 or release the gas in the high-pressure airbag 4 and / or the airbag 5, thereby avoiding the problem that the buoyancy of the airship is much greater than the gravity due to the sudden loss of load gravity, causing the airship to rise rapidly.

[0038] The main capsule 1 is the main structure of the low-altitude heavy-load transport airship. The main capsule 1 is made of high-strength skin material. The buoyancy gas filled in the main capsule 1 is used to overcome all the weight of the airship except the weight of the fuel. The surface of the skin material is coated with a coating 8 containing a nano-level ultraviolet absorber, a silicone composite material and a heat-sensitive material.

[0039] The airship pressure regulating system is a necessary condition for the airship to achieve ascent, descent and stay in the air. The pressure regulating system is an important part of the airship. It adjusts the pressure of the main capsule 1, the high-pressure airbag 4 and the air bag 5 to achieve the purpose of maintaining pressure and shape of the airship. The first pressure control system includes a compressor 8, a first pressure sensor, a first valve and a first controller. The first pressure sensor and the first valve are installed on the high-pressure airbag 4, the compressor 8 is installed on the outside of the high-pressure airbag 4, the first pressure sensor is connected to the flight control system signal, the first controller is connected to the flight control system, the compressor 8 and the first valve signal respectively, the flight controller sends instructions to the first controller according to the value detected by the first pressure sensor, and the first controller controls the opening and closing of the first valve and the compressor according to the instructions sent by the flight controller, thereby adjusting the gas pressure in the high-pressure airbag 4; wherein, the first pressure sensor is installed in the form of an opening of the high-pressure airbag 4, and is used to measure the pressure difference between the pressure of the high-pressure airbag 4 and the pressure of the main capsule 1, and the first valve is used to control the intake and exhaust of the high-pressure airbag 4.

[0040] The second pressure control system includes a blower 7, a second pressure sensor, a second valve and a second controller. The second pressure sensor and the second valve are installed on the air bag 5. The blower 7 is installed on the outside of the air bag 5 and the main bag body 1. The second pressure sensor is connected to the flight control system signal. The second controller is connected to the flight control system, the blower 7 and the second valve signal respectively. The flight controller sends instructions to the second controller according to the value detected by the second pressure sensor. The second controller controls the opening and closing of the second valve and the blower 7 according to the instructions sent by the flight controller, so as to adjust the gas pressure in the air bag 5. Similarly, the second pressure sensor is installed in the form of an opening of the air bag 5 to measure the pressure difference between the pressure of the air bag 5 and the ambient pressure. The second valve is used to control the air intake and exhaust of the air bag 5. The blower 7 cooperates with the second pressure sensor and the controller to adjust the gas pressure in the air bag 5 by controlling the second valve. The first controller and the second controller can realize the control of the first valve, the second valve, the blower 7 and the compressor 8 manually or remotely. In addition, a pressure sensor can also be installed inside the main bag body 1 to monitor the pressure difference between the main bag body 1 and the ambient pressure.

[0041] The flight control system also adjusts the pitch, roll and yaw attitudes of the aircraft, controls the flight speed, adjusts the flight direction and controls the action of the propulsion device 2 to ensure that the aircraft flies in a predetermined attitude.

[0042] The low-altitude, large-load transport airship also includes a propulsion device 2, an energy supply device, a pod, a buffer device, and a tail wing 3.

[0043] Among them, the propulsion device 2 is a high-power power device and a high-efficiency propeller, which are respectively installed at the front, left and right sides and tail of the low-altitude large-load transport airship to provide lift and adjust the pitch and heading attitude. The propulsion device 2 is divided into a vertical propulsion device and a horizontal propulsion device. The vertical propulsion device is provided on the side and tail of the hull. During take-off and landing, the vertical propulsion system and the static buoyancy of the hull provide vertical lift. The front and tail of the hull are equipped with horizontal propulsion devices. In the cruising state, the horizontal propulsion device provides forward flight power, and the static buoyancy of the hull and the aerodynamic lift provide lift. The horizontal propulsion device overcomes the resistance during flight.

[0044] The energy supply device consists of energy storage batteries and a power supply system, and is used to provide energy for various devices.

[0045] The pod is a carrier platform for avionics, payload, power supply and other subsystems. It is divided into an equipment cabin and a load cabin. The equipment cabin is equipped with avionics hardware subsystems and other airborne equipment. The avionics hardware subsystem consists of control computers, navigation, management, environment and status measurement modules, providing navigation positioning, parameter measurement, data collection and other functions for the airship. The load cabin is mainly used to carry personnel and cargo.

[0046] The buffer device includes a buffer air cushion 6 arranged at the bottom of the main bladder 1 and / or the pod. The buffer air cushion 6 has the function of alleviating the impact of landing when inflated, and can prevent the airship from rolling due to the interference of the ground side wind, so as to ensure the safe landing and cyclic release of the whole system. The buffer air cushion 6 is designed as at least two independent modular components, each of which has independent inflation, deflation and pressure regulation functions. When the buffer air cushion 6 is damaged or needs maintenance, a single module can be quickly replaced without the need to disassemble and repair the air cushion system as a whole, thus shortening the maintenance time.

[0047] The low-altitude, high-load transport airship is provided with four tail wings 3, which are installed at the rear of the airship and arranged in an X shape to provide stability in pitch, yaw and roll directions.

[0048] The low-altitude, large-load transport airship adopts an integrated floating layout. The hull is composed of two symmetrically distributed main bladders 1, which are interconnected to form an integral structure. At least two high-pressure airbags 4 and air bags 5 are arranged inside each main bladder 1, and the number of high-pressure airbags 4 and air bags 5 is set to 2-100 according to demand.

[0049] The present invention also provides a buoyancy control method for a low-altitude, high-load transport airship during loading and unloading, using the above-mentioned low-altitude, high-load transport airship, comprising the following contents:

[0050] After the cargo is loaded, the buoyancy gas inside the high-pressure airbag 4 is released into the main bag body 1 to increase the buoyancy of the low-altitude and heavy-load transport airship, and the air inside the airbag 5 is released into the external environment to reduce the gravity of the low-altitude and heavy-load transport airship, and the lift generated by the propulsion device 2 is cooperated to complete the take-off, rise to the cruising working altitude, and start level flight transportation;

[0051] Among them, when loading cargo, the load compartment can slowly descend to the ground, and the airship remains on the ground during unconventional operation, that is, the low-altitude large-load transport airship can float in the air throughout the entire flight process without landing on the ground. In an exemplary embodiment, the cruising altitude of the airship is controlled to a low-altitude flight within 1,000 meters, and the safe hovering altitude when releasing the load is about 20 meters.

[0052] In an exemplary embodiment, cargo is loaded into the load compartment by connecting the load compartment via cables, although other feasible loading methods are also possible.

[0053] In an exemplary embodiment, the buoyancy gas in the high-pressure airbag 4 and the air in the airbag 5 are released synchronously.

[0054] During the level flight transportation, the flight control system and the pressure control system intelligently adjust the flight speed and the air quality in the air bag 5 according to the fuel consumption to maintain the flight altitude;

[0055] Before landing at the destination, the pressure control system works in advance. The first pressure control system compresses the buoyancy gas in the main bag 1 and fills it into the high-pressure airbag 4 to reduce the buoyancy of the low-altitude heavy-load transport airship. The second pressure control system blows the outside air into the airbag 5 to increase the gravity of the low-altitude heavy-load transport airship, thereby reducing the flight altitude of the low-altitude heavy-load transport airship to a safe hovering altitude.

[0056] During the process of releasing the load, the first pressure control system continuously compresses the buoyancy gas and fills it into the high-pressure airbag 4, and the second pressure control system continuously blows outside air into the airbag 5. In this way, weight compensation is performed, and the total weight of the system is continuously increased, preventing a surge in net buoyancy caused by unloading the cargo, thereby ensuring flight safety.

[0057] When the above method cannot completely overcome the sudden change in net buoyancy caused by unloading the cargo, a downward pressure propulsion device capable of generating downward pressure can be installed on the main bladder 1. In an exemplary embodiment, the downward pressure propulsion device is a high-power propulsion device, which improves the structural strength of the main bladder 1 and makes the downward pressure generated by the downward pressure propulsion device act evenly on the main bladder 1 to avoid damage to the structure of the main bladder 1. When in use, the downward pressure propulsion device is started, and a continuous downward pressure propulsion method is adopted to press the airship down to a safe hovering height in conjunction with the airship's own buoyancy adjustment method to meet the mission requirements during heavy load transportation.

[0058] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. A low-altitude, high-load transport airship, characterized by: It includes a main bladder body filled with buoyancy gas, a high-pressure airbag and an air bag located in the main bladder body, a pressure control system for controlling the inflation and deflation of the high-pressure airbag and the air bag, and a flight control system for controlling the operation of the pressure control system. The density of the buoyancy gas is less than that of air. The pressure control system includes a first pressure control system and a second pressure control system. The first pressure control system controls the buoyancy gas to flow into or out of the high-pressure airbag, and the second pressure control system controls the outside air to flow into or out of the air bag. The flight control system is signal-connected to the first pressure control system and the second pressure control system, respectively.

2. The low-altitude, high-load transport airship according to claim 1, characterized in that: The main capsule is made of a high-strength skin material, and the surface of the skin material is coated with a coating containing a nano-level ultraviolet absorber, a silicone composite material and a heat-sensitive material.

3. The low-altitude, high-load transport airship according to claim 2, characterized in that: The low-altitude, high-load transport airship comprises two symmetrically distributed main capsules, which are interconnected to form an integral structure.

4. The low-altitude, high-load transport airship according to any one of claims 1 to 3, characterized in that: The first pressure control system includes a compressor, a first pressure sensor, a first valve and a first controller. The first pressure sensor and the first valve are installed on the high-pressure airbag, and the compressor is installed on the outside of the high-pressure airbag. The first pressure sensor is connected to the flight control system by signal. The first controller is connected to the flight control system, the compressor and the first valve by signal respectively. The flight controller sends an instruction to the first controller according to the value detected by the first pressure sensor, and the first controller controls the opening and closing of the first valve and the compressor according to the instruction sent by the flight controller. The second pressure control system includes a blower, a second pressure sensor, a second valve and a second controller. The second pressure sensor and the second valve are installed on the air bag, and the blower is installed on the outside of the air bag and the main bag body. The second pressure sensor is connected to the flight control system signal, and the second controller is respectively connected to the flight control system, the blower and the second valve signal. The flight controller sends instructions to the second controller according to the value detected by the second pressure sensor, and the second controller controls the opening and closing of the second valve and the blower according to the instructions sent by the flight controller.

5. The low-altitude, high-load transport airship according to claim 4, characterized in that: It also includes a propulsion device for providing lift and adjusting pitch and yaw attitude, an energy supply device for providing energy, a pod for carrying personnel, equipment and cargo, a cushioning device for mitigating the impact of touching the ground during landing, and a tail wing for providing pitch, yaw and roll directional stability.

6. The low-altitude, high-load transport airship according to claim 5, characterized in that: The propulsion device is a high-power power device and a high-efficiency propeller, and the high-power power device and the high-efficiency propeller are respectively installed at the front, left and right sides and tail of the low-altitude large-load transport airship; The propulsion device includes a vertical propulsion device and a horizontal propulsion device. The vertical propulsion device is installed on the side of the hull, and the horizontal propulsion device is installed in the front and tail of the hull.

7. The low-altitude, high-load transport airship according to claim 5, characterized in that: The buffer device comprises a buffer air cushion arranged at the main bag body and / or the bottom of the pod, and the buffer air cushion has at least two independent modular components, and each of the modular components has independent inflation, deflation and pressure regulation functions.

8. The low-altitude, high-load transport airship according to claim 5, characterized in that: The low-altitude, large-load transport airship is provided with at least two tail fins, which are installed at the rear of the airship and arranged in an X shape.

9. A buoyancy control method for a low-altitude, high-load transport airship during loading and unloading, using the low-altitude, high-load transport airship according to any one of claims 5 to 8, characterized in that: Includes the following: After the cargo is loaded, the buoyancy gas inside the high-pressure airbag is released into the main bag, and the air inside the airbag is released into the external environment, increasing the buoyancy of the low-altitude and heavy-load transport airship, reducing the gravity of the low-altitude and heavy-load transport airship, and cooperating with the lift generated by the propulsion device to complete the takeoff, rise to the cruising working altitude, and start level flight transportation; During level flight, the flight control system and pressure control system intelligently adjust the flight speed and the air quality in the air bag according to the fuel consumption to maintain the flight altitude. Before landing, the first pressure control system compresses the buoyancy gas in the main bag and fills it into the high-pressure airbag, and the second pressure control system fills the airbag with outside air to reduce the buoyancy of the low-altitude and heavy-load transport airship, increase the gravity of the low-altitude and heavy-load transport airship, and reduce the flight altitude of the low-altitude and heavy-load transport airship to a safe hovering altitude; During the process of releasing the load, the first pressure control system continuously compresses the buoyancy gas and fills it into the high-pressure airbag, and the second pressure control system continuously fills the airbag with outside air to prevent a surge in net buoyancy caused by unloading the cargo.

10. The buoyancy control method for the loading and unloading process of a low-altitude, high-load transport airship according to claim 9, characterized in that: When the above method cannot completely overcome the sharp change in net buoyancy caused by cargo unloading, a downward pressure propulsion device for generating downward pressure is installed on the main bladder, and the downward pressure propulsion device is started. The airship is pressed down to a safe hovering height by combining continuous downward pressure from the downward pressure propulsion device and adjustment of the airship's own buoyancy.

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