A ground hydraulic power unit

Abstract

The utility model discloses a ground hydraulic source vehicle relates to airplane ground support equipment field, including chassis, forecarriage, front automatic brake assembly, open-close type machine warehouse and the multifunctional system in machine warehouse, and front automatic brake assembly realizes automatic brake locking and release through Y type handle, catch, torsional spring, steel wire and guide roller, and the operation is convenient and reliable, and the machine warehouse is integrated high pressure output system (maximum 5000psi), low pressure output system, high accuracy filter system (3um / 10um) etc, forms double pressure output system (3000psi / 5000psi), and cooperates full -automatic safety function and prevents pressure misapplication, and PLC control system supports automatic / manual control, and panel system real -time display operating parameter, and monitoring system guarantees equipment safety, the utility model brake operation is simple, and hydraulic system is safe and efficient, and oil cleanliness is high, is applicable to airplane hydraulic system filling, flushing, testing and overhaul maintenance, and the scope of application is wide.

Description

Technical Field

[0001] This utility model relates to the field of aircraft ground support equipment technology, specifically to a ground hydraulic power source vehicle for aircraft hydraulic system maintenance, which has automatic brake release and release function and can achieve multiple pressure level output. Background Technology

[0002] During aircraft ground maintenance, the ground hydraulic power supply vehicle is a core piece of equipment ensuring the filling, draining, flushing, and testing of the aircraft's hydraulic system. Currently, traditional ground hydraulic power supply vehicles have the following shortcomings: The braking operation is cumbersome: The brakes of traditional hydraulic power vehicles mostly use manual bolt tightening or a single handle braking structure. When operating, you need to bend over and exert force, and the braking status depends on manual judgment. It is easy to have problems such as the brake not locking or not releasing completely, which poses a safety hazard during movement. Hydraulic system safety is insufficient: There are two common pressure levels in aircraft hydraulic systems, 3000psi and 5000psi. Traditional equipment requires manual switching of valves to regulate pressure. In case of operational errors, high pressure (such as 5000psi) can be mistakenly applied to the aircraft system that can only withstand 3000psi, resulting in damage to the aircraft hydraulic components. Low system integration: Traditional equipment has scattered functional modules such as high-pressure output, filtration, cooling, and monitoring, with complex pipeline connections. It is difficult to consistently achieve the NAS1638 Class 6 cleanliness requirements, and maintenance requires disassembling each module one by one, which is inefficient. Inconvenient operation and monitoring: The lack of a unified integrated control and display panel means that operating parameters (such as pressure, flow rate, and liquid level) need to be read through multiple independent instruments, and fault alarms are not intuitive, increasing the workload of operators.

[0003] To address the aforementioned issues, there is an urgent need to design a ground hydraulic power source vehicle with automatic brake activation and deactivation, a highly integrated hydraulic system, and high safety and reliability, in order to meet the efficiency and safety requirements of aircraft ground maintenance. Utility Model Content

[0004] The purpose of this utility model is to provide a ground-based hydraulic power source vehicle that solves the problems of cumbersome braking operation, low safety of the hydraulic system, and poor integration in traditional equipment. The specific technical solution is as follows: A ground hydraulic power source vehicle includes a chassis, rear casters, a front automatic braking assembly, an openable and closable engine compartment, and a high-pressure output system, a low-pressure output system, a filtration system, a cooling system, a flow system, an oil storage system, a piping system, a panel system, a control system, and a monitoring system disposed inside the engine compartment.

[0005] The front automatic braking assembly includes a wheel seat movably mounted at the bottom of the rear end of the chassis, a front caster wheel mounted at the bottom of the wheel seat, a pivot seat mounted at one end of the wheel seat, a Y-shaped handle mounted on the pivot seat, a guide roller mounted on the pivot seat's shaft, a U-shaped bracket fixed to the pivot seat, and a hook movably mounted on the Y-shaped handle. A torsion spring is provided between the hook and the Y-shaped handle, the torsion spring being sleeved on the connecting pin between the hook and the Y-shaped handle, one end of the torsion spring abutting against the Y-shaped handle, and the other end abutting against the hook. The hook can be engaged with the U-shaped bracket. A braking assembly is provided on the front caster wheel, the braking assembly including a brake caliper and a brake pad. The brake caliper is fixed to the axle bracket of the front caster wheel, the brake pad is disposed inside the brake caliper, and the brake pad is connected to a steel wire rope. The braking assembly is connected to the Y-shaped handle via a steel wire rope, the steel wire rope's transmission direction being changed by the guide roller.

[0006] Hydraulic System and Pressure Output: The high-pressure output system and low-pressure output system in the cabin work together to form a dual-pressure output system. The dual-pressure output system is equipped with two high-pressure pipes and two low-pressure return pipes, and both high-pressure pipes and low-pressure return pipes are equipped with shut-off valves. One high-pressure pipe can output 3000 psi pressure, and the other high-pressure pipe can output 5000 psi pressure. The control system integrates a fully automatic safety function to avoid applying 5000 psi pressure to the aircraft hydraulic system, which can only withstand 3000 psi.

[0007] Each functional system: High-pressure output system: includes a high-pressure plunger variable pump and a drive motor; the high-pressure plunger variable pump has a maximum displacement of 140 cm³ / rev, a set flow rate of 190 L / min, and a maximum working pressure of 5000 psi; the high-pressure output system also includes a high-pressure safety valve, which has a set pressure of 5500 psi and can provide high-pressure fluid to meet the system requirements.

[0008] Low-pressure output system: includes a gear pump, a vane pump, and a low-pressure pump motor. The low-pressure pump motor is a 380V 0.75KW 50HZ 1450r / min motor. The low-pressure pump motor provides power to the gear pump and the vane pump. The gear pump is used to fill the aircraft hydraulic oil tank. The outlet of the vane pump is connected to the inlet of the high-pressure plunger variable pump to supply oil to the high-pressure plunger variable pump.

[0009] Filtration system: Includes a high-precision filter to ensure oil cleanliness and features an oil contamination alarm.

[0010] Cooling system: A high-efficiency air cooler is used to control the oil temperature.

[0011] Flow system: Equipped with a VSE high-precision flow meter, which can monitor oil flow in real time.

[0012] Oil storage system: It adopts a stainless steel oil tank with an integrated visual liquid level window, which can realize real-time liquid level monitoring and liquid level protection.

[0013] Piping system: Hydraulic hoses of different pressure ratings are used, covering 3000psi and 5000psi pressure ratings.

[0014] Panel system: can display operating temperature, operating flow rate, operating pressure, real-time liquid level and fault alarm information.

[0015] Control system: includes PLC controller, variable pump controller, flow controller, pressure controller and temperature controller; has automatic / manual control functions, and can quickly switch between 3000psi and 5000psi pressure in automatic mode; the flow controller is used to adjust the system output flow, the pressure controller is used to regulate the system output pressure, and the temperature controller is used to control the oil temperature in conjunction with the cooling system.

[0016] The monitoring system includes a pressure sensor, a flow sensor, a temperature sensor, a level sensor, and a fault monitoring module. The pressure sensor is used to implement pressure rise protection, and the flow sensor is electrically connected to the VSE high-precision flow meter to collect flow signals. The fault monitoring module is used to collect abnormal signals from each sensor and trigger fault alarms, covering pressure monitoring, flow monitoring, temperature monitoring, level monitoring, and fault monitoring functions.

[0017] Brake locking process: After the hydraulic power unit is pushed to the designated working position, the operator rotates the Y-shaped handle, which drives the hook to rotate synchronously. Under the elastic force of the torsion spring, the hook automatically engages with the U-shaped bracket, thus locking the position of the Y-shaped handle. At the same time, when the Y-shaped handle rotates, it pulls the brake assembly on the front caster through the wire rope. The brake pads clamp the wheel body to generate braking force, thus completing the braking operation.

[0018] Brake release process: When it is necessary to move the hydraulic power source vehicle, the operator pulls the hook in the opposite direction of the torsion spring force to disengage the hook from the U-shaped bracket; then rotates the Y-shaped handle in the opposite direction, the Y-shaped handle loosens the wire rope, the brake pads of the brake assembly separate from the front caster, the braking force is released, and the hydraulic power source vehicle can be pushed to move.

[0019] Beneficial effects The braking operation is convenient and reliable: the front automatic braking component uses a Y-shaped handle and a hook to lock or release the brake by simply turning the handle, without having to bend over or exert force, thus improving operational efficiency; the torsion spring ensures that the hook is reliably engaged, preventing accidental brake release; and the guide roller optimizes the direction of the wire rope transmission, ensuring stable transmission of braking force.

[0020] The hydraulic system is safe and efficient: the dual pressure output system can meet the pressure requirements of different aircraft hydraulic systems, and the fully automatic safety function effectively prevents the application of pressure and avoids damage to aircraft hydraulic components; the combination of proportional control of the high-pressure plunger variable pump and open-loop hydraulic control can accurately match the pressure and flow requirements under different operating conditions, and the high-pressure safety valve further ensures the system pressure safety.

[0021] High oil cleanliness and stability: The high-precision filtration system and oil contamination alarm function ensure that the oil cleanliness consistently reaches NAS1638 Class 6 or higher; the high-efficiency air cooler and temperature monitoring work together to control the oil temperature within a safe range (over-temperature setting 65℃) to prevent the oil from deteriorating due to high temperature.

[0022] Excellent integration and maintainability: All functional systems are integrated into the openable and closed housing, with a reasonable pipeline layout and convenient component maintenance; the stainless steel oil tank with a visible liquid level window, the weatherproof control panel and the heavy-duty frame with a leak-proof tray further enhance the practicality and service life of the equipment.

[0023] Wide range of applications: It can be used for filling, draining, flushing, ground testing and overhaul maintenance of aircraft hydraulic systems. It can also be combined with ram air turbine ground test equipment to simulate RAT operation. It is suitable for all aircraft with 5000psi hydraulic systems and the maximum flow rate can reach 190L / min. Attached Figure Description

[0024] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 is a schematic diagram of the structure of this utility model; Figure 2 is a schematic diagram of the structure of this utility model; Figure 3 is a schematic diagram of the bottom structure of this utility model; Figure 4 is a schematic diagram of the front automatic braking assembly of this utility model; Figure 5 is a schematic diagram of the openable and closable cabin structure of this utility model in the open state; Figure 6 is a schematic diagram of the openable and closable cabin structure of this utility model in the open state; The following components are marked in the diagram: 1. Chassis; 2. Rear caster; 3. Front automatic brake assembly; 4. Openable / closable engine compartment; 5. High-pressure output system; 6. Low-pressure output system; 7. Filtration system; 8. Cooling system; 9. Flow system; 10. Oil storage system; 11. Piping system; 12. Panel system; 13. Control system; 14. Monitoring system; 31. Wheel seat; 32. Front caster; 33. Axle seat; 34. Y-shaped handle; 35. Guide roller; 36. U-shaped bracket; 37. Hook; 38. Torsion spring; 39. Brake assembly; 310. Wire rope. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] As shown in Figures 1-6, this embodiment provides a ground hydraulic power source vehicle.

[0027] Example 1 The ground hydraulic power source vehicle of this embodiment includes a chassis 1, rear casters 2, front automatic braking assembly 3, openable and closable engine compartment 4, and a high-pressure output system 5, a low-pressure output system 6, a filtration system 7, a cooling system 8, a flow system 9, an oil storage system 10, a pipeline system 11, a panel system 12, a control system 13, and a monitoring system 14 disposed inside the engine compartment 4.

[0028] Assembly of the front automatic braking assembly 3: Wheel seat 31 is movably connected to the bottom rear end of chassis 1 via a pin; front caster 32 is mounted on the bottom of wheel seat 31 via a bearing; pivot seat 33 is welded to one end of wheel seat 31; Y-shaped handle 34 is hinged to pivot seat 33 via a pivot; guide roller 35 is fixed to the side of pivot seat 33 via a pivot; U-shaped bracket 36 is welded to the top of pivot seat 33; hook 37 is movably connected to the end of Y-shaped handle 34 via a connecting pin; torsion spring 38 is sleeved on the connecting pin, one end of torsion spring 38 abuts against Y-shaped handle 34, and the other end abuts against hook 37; brake assembly 39 includes brake caliper and brake pad; brake caliper is fixed to the axle of front caster 32 via a wheel axle bracket; brake pad is disposed inside brake caliper; brake lever of brake pad is connected to one end of wire rope 310; wire rope 310 The other end passes around the guide roller 35 and connects to the middle of the Y-shaped handle 34.

[0029] Assembly and connection of various systems: The stainless steel oil tank (capacity 250L) of the oil storage system 10 is fixed at the bottom of the engine compartment 4. A visual liquid level window is welded on the oil tank, and the liquid level sensor is installed on the inner wall of the oil tank. The gear pump and vane pump of the low-pressure output system 6 are fixed next to the oil tank by a bracket and are driven by a low-pressure pump motor (380V 0.75KW 50HZ 1450r / min). The oil inlet of the gear pump is connected to the oil outlet of the oil tank through a pipe, and the oil outlet of the gear pump is connected to the aircraft hydraulic oil tank interface through a pipe. The oil inlet of the vane pump is connected to the oil outlet of the oil tank, and the oil outlet of the vane pump is connected to the oil inlet of the high-pressure plunger variable pump of the high-pressure output system 5 through a pipe. The high-pressure variable displacement pump of the high-pressure output system 5 is driven by a drive motor (model: 380V 110KW 50HZ 1450r / min). The maximum displacement of the high-pressure variable displacement pump is 140cm³ / rev, the set flow rate is 190L / min, and the maximum working pressure is 5000psi. A high-pressure safety valve is installed in the high-pressure output pipeline, and the set pressure of the high-pressure safety valve is 5500psi. The oil outlet of the high-pressure variable displacement pump is connected to the high-pressure filter (3μm precision) of the filter system 7 through a pipeline. The oil outlet of the high-pressure filter is connected to the first high-pressure line (output 5000psi) through the 5000psi hydraulic line of the pipeline system, and is also connected to the second high-pressure line (output 3000psi) through a reversing valve. The air cooler of the cooling system 8 is connected in series in the return oil line. The return oil line is connected in sequence to the low pressure return oil line, the return oil filter (10μm precision) of the filtration system 7, and the air cooler, and then returns to the oil tank of the oil storage system 10. The VSE high-precision flow meter of the flow system 9 is connected in series in the high-pressure output line; the pressure sensor (for pressure rise protection) of the monitoring system 14 is installed in the high-pressure output line, and the flow sensor is electrically connected to the VSE high-precision flow meter to collect flow signals; the temperature sensor (for high-temperature alarm and over-temperature setting of 65°C) is installed in the return line, and the high-pressure filter blockage differential pressure sensor (set to 100psi) is installed at both ends of the high-pressure filter; the monitoring system also includes a fault monitoring module, which is used to collect abnormal signals from each sensor and trigger fault alarms; The PLC controller of the control system 13 is fixed in the electrical control cabinet inside the machine compartment 4. The control system also includes a variable pump controller, a flow controller, a pressure controller, and a temperature controller. The PLC controller is electrically connected to the variable pump controller, flow controller, pressure controller, and temperature controller of the drive motor, the low-pressure pump motor, the high-pressure plunger variable pump, the air cooler, various sensors (pressure sensor, flow sensor, temperature sensor, liquid level sensor, differential pressure sensor), and the display screen of the panel system 12. The operation buttons of the panel system 12 (including the automatic pressure boost button, the pressure adjustment buttons "+" and "-", and the flow setting potentiometer) are electrically connected to the PLC controller.

[0030] Work process Equipment positioning and brake locking: Push the hydraulic power source cart to the designated position next to the aircraft, rotate the Y-shaped handle 34, and the hook 37 will engage with the U-shaped bracket 36 under the action of the torsion spring 38. The Y-shaped handle 34 will pull the brake pad of the brake assembly 39 through the steel wire rope 310, and the brake pad will clamp the front caster 32, thus locking the equipment.

[0031] Hydraulic system start-up and pressure selection: Connect the input power (460 / 380±10% VAC, 60 / 50Hz), and select "Automatic Mode" or "Manual Mode" via panel system 12: Automatic mode: Press the "Automatic Pressure Boost" button, and the PLC controller will start the high-pressure plunger variable pump. According to the preset requirements, the pump will switch to 3000psi or 5000psi pressure output through the reversing valve. The fully automatic safety function monitors the pressure tolerance value of the aircraft hydraulic system in real time. If it is detected that the aircraft system only supports 3000psi, the 5000psi pressure output circuit will be automatically cut off. Manual mode: Adjust the pressure using the "+" and "-" buttons, and adjust the flow rate using the flow setting potentiometer in conjunction with the flow controller. The display screen shows the actual pressure, flow rate, liquid level, and temperature data in real time.

[0032] Aircraft hydraulic system maintenance: Oil filling: The low-pressure pump motor drives the gear pump to start, draw oil from the oil tank of the oil storage system 10, and inject it into the aircraft hydraulic oil tank through the pipeline; System flushing: The high-pressure plunger variable pump outputs high-pressure oil, which enters the aircraft hydraulic system after being filtered by a high-pressure filter. The flushed oil is then returned to the oil tank after passing through a low-pressure return oil pipe, a return oil filter, and being cooled by an air cooler, until the oil cleanliness reaches NAS1638 level 6. Ground testing: According to the requirements of the Aircraft Maintenance Manual (AMM), output the corresponding pressure (3000psi or 5000psi) of oil to provide a test hydraulic source for the aircraft hydraulic system. The monitoring system 14 monitors the pressure, flow rate and temperature in real time. If the set value is exceeded (such as temperature exceeding 65℃ or pressure exceeding 5500psi), the panel system 12 will alarm and the control system 13 will automatically cut off the power supply to the relevant components.

[0033] Equipment movement and brake release: After maintenance, pull the hook 37 to disengage from the U-shaped bracket 36, rotate the Y-shaped handle 34 in the opposite direction, loosen the wire rope 310, release the brake pads of the brake assembly 39 from the front caster 32, and push the equipment to the next position.

[0034] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A ground hydraulic power source vehicle, characterized in that, The system includes a chassis (1), rear casters (2), a front automatic braking assembly (3), an openable engine compartment (4), and a high-pressure output system (5), a low-pressure output system (6), a filtration system (7), a cooling system (8), a flow system (9), an oil storage system (10), a piping system (11), a panel system (12), a control system (13), and a monitoring system (14) installed inside the openable engine compartment (4). The front automatic braking assembly (3) includes a wheel seat (31) movably installed at the bottom of the rear end of the chassis (1), a front caster (32) installed at the bottom of the wheel seat (31), and a pivot seat (33) installed at one end of the wheel seat (31). A Y-shaped handle (34) is provided on the pivot seat (33), a guide roller (35) is provided on the pivot shaft of the pivot seat (33), a U-shaped bracket (36) is fixed on the pivot seat, and a hook (37) is movably provided on the Y-shaped handle (34); a torsion spring (38) is provided between the hook (37) and the Y-shaped handle (34), and the hook (37) can be engaged with the U-shaped bracket (36); a brake assembly (39) is provided on the front caster (32), and the brake assembly (39) is connected to the Y-shaped handle (34) by a steel wire rope (310), and the steel wire rope (310) can change the transmission direction through the guide roller (35); The high-pressure output system (5) and the low-pressure output system (6) work together to form a dual-pressure output system, which is equipped with two high-pressure pipes and two low-pressure return oil pipes.

2. The ground hydraulic power source vehicle according to claim 1, characterized in that, The torsion spring (38) is sleeved on the connecting pin of the hook (37) and the Y-shaped handle (34). One end of the torsion spring (38) abuts against the Y-shaped handle (34), and the other end abuts against the hook (37).

3. A ground hydraulic power source vehicle according to claim 1, characterized in that, The brake assembly (39) includes a brake caliper and a brake pad. The brake caliper is fixed on the axle bracket of the front caster (32), and the brake pad is disposed inside the brake caliper and connected to the wire rope (310).

4. A ground hydraulic power source vehicle according to claim 1, characterized in that, The high-pressure output system (5) includes a high-pressure plunger variable pump and a drive motor; the maximum displacement of the high-pressure plunger variable pump is 140 cm³ / rev, the set flow rate is 190 L / min, and the maximum working pressure is 5000 psi; the high-pressure output system (5) also includes a high-pressure safety valve, the set pressure of which is 5500 psi.

5. A ground hydraulic power source vehicle according to claim 1, characterized in that, The low-pressure output system (6) includes a gear pump, a vane pump and a low-pressure pump motor. The low-pressure pump motor is a 380V 0.75KW 50HZ 1450r / min motor. The gear pump is used to fill the aircraft hydraulic oil tank. The outlet of the vane pump is connected to the inlet of the high-pressure plunger variable pump.

6. A ground hydraulic power source vehicle according to claim 1, characterized in that, The filtration system (7) includes a high-pressure filter and a return oil filter. The high-pressure filter has a filtration accuracy of 3 μm, and the return oil filter has a filtration accuracy of 10 μm. The filtration system (7) also includes a high-pressure filter blockage differential pressure sensor. The high-pressure filter blockage differential pressure sensor has a set differential pressure of 100 psi, and the filtration system (7) has an oil stain alarm function.

7. A ground hydraulic power source vehicle according to claim 1, characterized in that, The oil storage system (10) is a stainless steel oil tank with a volume of 250L; the stainless steel oil tank is integrated with a visual liquid level window; the monitoring system (14) includes a liquid level sensor, which can realize high liquid level alarm and low liquid level alarm.

8. A ground hydraulic power source vehicle according to claim 1, characterized in that, The control system (13) includes a PLC controller, a variable pump controller, a flow controller, a pressure controller, and a temperature controller.

9. A ground hydraulic power source vehicle according to claim 1, characterized in that, The monitoring system (14) includes a pressure sensor, a flow sensor, a temperature sensor, a level sensor and a fault monitoring module; the pressure sensor is used to implement pressure rise protection, and the flow system (9) includes a VSE high-precision flow meter, which is electrically connected to the flow sensor.

10. A ground hydraulic power source vehicle according to claim 1, characterized in that, The piping system (11) includes hydraulic pipes with a pressure rating of 3000 psi and hydraulic pipes with a pressure rating of 5000 psi; the cooling system (8) is a high-efficiency air cooler; the panel system (12) can display operating temperature, operating flow rate, operating pressure, real-time liquid level and fault alarm information.

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