Hydraulic lifting system and aircraft refueling truck

Abstract

The utility model discloses a hydraulic lifting system and an aircraft refueling truck. The hydraulic lifting system comprises an execution hydraulic cylinder, an oil tank, a control valve and an oil pumping assembly. The oil tank communicates with an oil cavity of the execution hydraulic cylinder. The control valve is used for controlling connection or disconnection of oil ways between the execution hydraulic cylinder and the oil tank. The oil pumping assembly comprises an oil pumping piece and at least two driving pieces. And the oil pumping piece acts on an oil inlet path between the oil tank and the execution hydraulic cylinder. The driving parts are used for driving the oil pumping part to operate, and the driving parts operate independently. And when the control valve is in a conducting state, any driving piece drives the oil pumping piece to operate, so that the hydraulic oil in the oil tank is pumped into the oil cavity of the execution hydraulic cylinder to drive the piston rod of the execution hydraulic cylinder to move. The hydraulic lifting system provided by the utility model is high in operation reliability, can assist the aircraft refueling truck in smoothly completing aircraft refueling operation, and ensures stable operation of an airport.

Description

Technical Field

[0001] The present application relates to the technical field of aircraft refueling vehicles, and in particular to a hydraulic lifting system and an aircraft refueling vehicle. Background Art

[0002] Airports are crucial transportation hubs connecting cities to the world. Large airports typically have fuel tanks and underground refueling pipelines connecting these tanks to aircraft parking bays. However, these underground refueling pipelines often cannot reach every parking bay, requiring aircraft refueling trucks to connect underground wells in the underground refueling pipelines to the parking bays to supply fuel to aircraft, ensuring safe and stable airport operations.

[0003] In related technology, aircraft refueling trucks are equipped with various mounted components, such as a refueling platform and a ground stand, to assist aircraft refuelers in refueling operations. These mounted components are often driven by the refueling truck's hydraulic lift system. However, the hydraulic lift system is often powered by the refueling truck's own power system. If the refueling truck's power system fails, the hydraulic lift system will not function, preventing the mounted components from completing the refueling operation. This can cause flight delays and other safety incidents that affect the stable operation of airports, posing a certain safety hazard. Utility Model Content

[0004] The present application provides a hydraulic lifting system and an aircraft refueling truck, which can improve the operational reliability of the hydraulic lifting system, thereby assisting the aircraft refueling truck to complete aircraft refueling operations and ensure the stable operation of the airport.

[0005] The technical solutions adopted in this application are as follows:

[0006] According to the first aspect disclosed in the present application, there is provided a hydraulic lifting system, comprising an actuator hydraulic cylinder, an oil tank, a control valve and an oil pumping assembly. The oil tank is connected to the oil chamber of the actuator hydraulic cylinder. The control valve is used to control the conduction or disconnection of each oil circuit between the actuator hydraulic cylinder and the oil tank. The oil pumping assembly comprises an oil pumping member and at least two driving members. The oil pumping member acts on the oil inlet circuit between the oil tank and the actuator hydraulic cylinder. The driving member is used to drive the oil pumping member to operate, and each driving member operates independently of each other. When the control valve is in the conducting state, any driving member drives the oil pumping member to operate, so that the hydraulic oil in the oil tank is pumped into the oil chamber of the actuator hydraulic cylinder to drive the piston rod of the actuator hydraulic cylinder to move.

[0007] The hydraulic lifting system provided by this application has at least the following beneficial effects:

[0008] When the hydraulic lifting system provided by the present application is in use, the driving component provides mechanical energy to the oil pumping component to drive the oil pumping component to operate. During operation, the oil pumping component pumps the hydraulic oil in the oil tank into the pipeline of the hydraulic lifting system, and then adjusts the conduction or disconnection of each oil circuit between the executing hydraulic cylinder and the oil tank through the control valve, so that the hydraulic oil can be pumped into the oil chamber of the executing hydraulic cylinder, thereby driving the piston rod of the executing hydraulic cylinder to move. For example, when the oil pumping assembly pumps the hydraulic oil into the rod oil chamber of the executing hydraulic cylinder, the piston rod of the executing hydraulic cylinder is retracted. When the oil pumping assembly pumps the hydraulic oil into the rodless oil chamber of the executing hydraulic cylinder, the piston rod of the executing hydraulic cylinder is extended.

[0009] At the same time, because the hydraulic lifting system of the present application is provided with multiple independent driving components, and each driving component can provide driving force for the oil pumping component separately, it can prevent the oil pumping component from being unable to operate after losing its driving source due to a single driving source. Therefore, the oil pumping component obtains driving force through multiple driving paths, so that it can continue to supply energy to the hydraulic lifting system, ensuring the normal operation of the hydraulic lifting system, and thus improving the operational reliability of the hydraulic lifting system.

[0010] According to a second aspect disclosed herein, an aircraft refueling vehicle is provided, comprising a vehicle body, a top assembly, and the aforementioned hydraulic lifting system. The top assembly includes at least one of a ground support and a refueling platform mounted on the vehicle body. The piston rod of the actuator hydraulic cylinder is connected to the top assembly.

[0011] The aircraft refueling vehicle provided by this application has at least the following beneficial effects:

[0012] During refueling operations, the aircraft refueling truck provided in this application can utilize its hydraulic lifting system, which can be powered by both the vehicle's own power system and a power system independent of the vehicle. This provides a variety of driving options for the hydraulic lifting system and prevents the hydraulic lifting system's oil pump components from malfunctioning due to a lack of power. Thus, the hydraulic lifting system can drive the vehicle's upper components, ensuring the vehicle can successfully complete aircraft refueling operations, ensuring timely and on-time takeoff and departure, and maintaining stable airport operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the principle of an embodiment of the hydraulic lifting system in this application.

[0014] Figure 2 It is a schematic diagram of the principle of another embodiment of the hydraulic lifting system in this application.

[0015] Figure 3 It is a schematic diagram of the principle of another embodiment of the hydraulic lifting system in this application.

[0016] Figure 4 yes Figure 3 Schematic diagram of the oil circuit connection of the hydraulic lifting system.

[0017] Figure 5 This is a schematic diagram of the oil circuit connection of another embodiment of the hydraulic lifting system in this application.

[0018] Figure 6 This is a schematic diagram of the oil circuit connection of another embodiment of the hydraulic lifting system in the present application.

[0019] Figure 7 yes Figure 6 Schematic diagram of the oil circuit connection of the hydraulic lifting system.

[0020] Figure 8 yes Figure 7 Schematic diagram of the structure of the middle-stage reversing valve.

[0021] Figure 9 This is a schematic diagram of the oil circuit connection of the hydraulic lifting system of the present application applied to the hydraulic system of the aircraft refueling truck.

[0022] Figure 10 It is a structural schematic diagram of the aircraft refueling vehicle of this application.

[0023] Reference numerals:

[0024] 100-Hydraulic lifting system; 110-Executing hydraulic cylinder; 111-First-stage hydraulic cylinder; 112-Second-stage hydraulic cylinder; 120-Oil tank; 130-Control valve; 131-First-stage reversing valve; 132-First-stage on-off valve; 133-Second-stage on-off valve; 134-Third-stage on-off valve; 140-Oil pump assembly; 141-Oil pump component; 142-Drive component; 150-Relief valve; 160-Hydraulic-controlled check valve; 170-One-way speed regulating valve;

[0025] 200-Hydraulic system of aircraft refueling truck; 210-Hydraulic motor; 220-Two-stage reversing valve; 230-Three-stage reversing valve; 240-Oil pump; 250-Four-stage reversing valve; 260-Combination valve; 270-Oil pressure gauge.

[0026] 300-Aircraft refueling vehicle; 310-Vehicle body; 320-Trigging frame; 330-Refueling platform; 340-Refueling hose reel. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in this application to clearly and completely describe the technical solutions in this application. It should be understood that the drawings in this application are for illustrative purposes only, and for those skilled in the art, the omission of certain well-known structures and their descriptions in the drawings is understandable. At the same time, in the description of this application, if there are terms such as "upper", "lower", "left", "right", etc. that indicate orientation or positional relationships, these are only simplified descriptions based on the orientation or positional relationships shown in the drawings for the convenience of describing this application, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Accordingly, the description of this application involves similar descriptions such as "first", "second", "primary" or "secondary", which are only used to distinguish different components and cannot be understood as indicating or implying their relative importance, any order, or implicitly indicating the number of technical features indicated.

[0028] Airports are crucial transportation hubs connecting cities with the world. To improve operational efficiency, large airports typically have fuel tanks and underground refueling pipelines connecting these tanks to aircraft parking bays. Underground refueling pipelines often cannot reach every parking bay, so aircraft refueling trucks are connected between underground refueling pipeline wells and aircraft parking bays to supply fuel to aircraft, ensuring safe and stable flight operations and airport operations.

[0029] In the prior art, aircraft refueling trucks typically travel under the wings of aircraft to refuel. These trucks are equipped with various components, such as a refueling platform and a ground support, to assist the refueler in refueling operations. For example, the refueler can ride the refueling platform close to the aircraft's wing to connect and disconnect the aircraft's refueling hose and the aircraft's refueling port. The refueler can also use the ground support to raise and lower the ground support to drag the ground support hose, disconnecting and connecting the aircraft's refueling hose to the ground support connection of the underground refueling pipeline.

[0030] The upper components of aircraft refueling trucks are often driven by a hydraulic lifting system. However, the hydraulic lifting system's fuel pump is typically driven by the aircraft refueling truck's power system. This makes the fuel pump susceptible to engine failure, clutch failure, or failure of the hanging pump system. This can cause the hydraulic lifting system's fuel pump to lack a driving source, rendering the hydraulic lifting system inoperable and, in turn, preventing the upper components from refueling the aircraft. For example, if the refueling platform cannot be raised or lowered properly, the aircraft's refueling pipe and refueling port cannot be separated, causing flight delays and other safety incidents that affect the stable operation of the airport, posing certain safety risks.

[0031] Therefore, the present application provides a hydraulic lifting system that can provide power to the oil supply pump through multiple drive sources to prevent the oil supply pump from losing its drive source, which may cause the hydraulic lifting system to fail to operate normally, thereby improving the operational reliability of the hydraulic lifting system. In addition, the hydraulic lifting system provided by the present application can be applied not only to aircraft refueling vehicles, but also to other equipment such as ship hydraulic lifting systems, and this application does not impose any restrictions. At the same time, when the hydraulic oil of the hydraulic lifting system in the present application is replaced with a gas medium, it can also be applied to pneumatically controlled lifting systems, which will not be elaborated in this application.

[0032] The hydraulic lifting system 100 provided in this application will be described below with reference to the accompanying drawings.

[0033] See also Figure 1 The hydraulic lifting system 100 provided in the present application includes an actuator hydraulic cylinder 110, an oil tank 120, a control valve 130 and an oil pump assembly 140. The oil tank 120 is connected to the oil chamber of the actuator hydraulic cylinder 110 to form an oil inlet circuit and an oil return circuit. The control valve 130 is used to control the conduction or disconnection of each oil circuit between the actuator hydraulic cylinder 110 and the oil tank 120. The oil pump assembly 140 includes an oil pump component 141 and at least two driving components 142. The oil pump component 141 acts on the oil inlet circuit. The driving component 142 is used to drive the oil pump component 141 to operate, and each driving component 142 operates independently of each other. When the control valve 130 is in the conductive state, any driving component 142 drives the oil pump component 141 to operate, so that the hydraulic oil in the oil tank 120 is pumped into the oil chamber of the actuator hydraulic cylinder 110 to drive the piston rod of the actuator hydraulic cylinder 110 to move.

[0034] It should be noted that the driving component 142 is used to provide mechanical energy to the oil pumping component 141 to drive the oil pumping component 141 to operate. The oil pumping component 141 is used to rely on the mechanical energy provided by the driving component 142 to pump the hydraulic oil in the oil tank 120 into the pipeline of the hydraulic lifting system 100, so as to convert the mechanical energy provided by the driving component 142 into the hydraulic energy of the hydraulic oil in the hydraulic lifting system 100. The control valve 130 is used to control the conduction or disconnection of each oil circuit between the actuator hydraulic cylinder 110 and the oil tank 120, so that the hydraulic oil flows in and out of the oil chamber of the actuator hydraulic cylinder 110 along the conducted oil circuit, so as to utilize the hydraulic energy of the hydraulic oil to drive the actuator hydraulic cylinder 110 to operate. Among them, the control valve 130 can be a stop valve or a reversing valve, which is not limited in this application. The actuator hydraulic cylinder 110 can convert the hydraulic energy of the hydraulic oil into mechanical energy for performing work outside the hydraulic lifting system 100, so as to connect an external working mechanism (such as a refueling platform or a ground frame on an aircraft refueling truck) through the actuator hydraulic cylinder 110 to drive the external working mechanism to move.

[0035] As an example, the driving element 142 may include various power devices such as an electric motor, an internal combustion engine, a wind turbine, or a manual device. The at least two driving elements 142 in this application may be the same type of power device or different types of power devices, and this application does not impose any limitation thereto. The oil pumping element 141 may be various hydraulic pumps such as a gear pump, a vane pump, a plunger pump, or a screw pump, and this application does not impose any limitation thereto.

[0036] Each driver 142 can be connected to the oil pumping element 141, with the driver 142 providing driving force to the oil pumping element 141 by switching the driver 142. This allows the other driver 142 to continue providing driving force to the oil pumping element 141, preventing the oil pumping element 141 from being unable to operate due to loss of its driving source. This allows the oil pumping element 141 to continue supplying energy to the hydraulic lift system 100 and maintain its operation. For example, the driver 142 and the oil pumping element 141 can cooperate to form an oil pumping assembly 140, which serves as the oil supply pump for the hydraulic lift system 100. The oil pumping assembly 140 can be a manual electric integrated pump that allows for both electric and manual operation. This allows the hydraulic lift system 100 to pump oil electrically or manually when power is insufficient, maintaining the hydraulic lift system 100's energy supply. For the manual oil pumping portion, a manual gear system or a manual crank mechanism can be installed on the drive shaft of the oil pumping element 141. In this way, when the electric drive fails, the oil pump 141 can be driven by manually rotating the gear or swinging the manual crank.

[0037] Of course, the oil pump assembly 140 can also be a hybrid system that allows the internal combustion engine and electricity to switch between driving the hydraulic pump, or a hybrid system that allows the internal combustion engine and manual switching to drive the hydraulic pump. As long as the various drive components 142 can operate independently of each other and switch to drive the oil pump component 141, this application does not limit the drive combination of the oil pump assembly 140. In addition, the various drive components 142 can be switched between by a clutch system or manual disassembly and assembly, etc., which are not detailed in this application.

[0038] The execution hydraulic cylinder 110 includes an oil cylinder and a piston rod. The oil cylinder is provided with an oil chamber, one end of the piston rod is provided inside the oil chamber, and the other end of the piston rod is provided outside the oil chamber. The flow of hydraulic oil in the oil chamber can drive the piston rod to reciprocate relative to the oil cylinder. In some embodiments, the execution hydraulic cylinder 110 also includes an elastic member such as a spring, which can be connected between the piston rod and the oil cylinder to drive the piston rod to reciprocate relative to the oil cylinder through the elastic deformation of the elastic member and the flow of hydraulic oil. Alternatively, the execution hydraulic cylinder 110 can also drive the piston rod to reciprocate relative to the oil cylinder through the external force (such as gravity) exerted on the piston rod and the flow of hydraulic oil, which is not limited in this application. In this way, the execution hydraulic cylinder 110 connects the piston rod to an external working mechanism such as an upper assembly, and can drive the external working mechanism to perform reciprocating linear motion to achieve the lifting function. The number of execution hydraulic cylinders 110 can be selected according to the working requirements of the hydraulic lifting system 100, which is not limited in this application.

[0039] Therefore, when the hydraulic lifting system 100 provided by the present application is in use, the driving component 142 provides mechanical energy to the oil pumping component 141, driving the oil pumping component 141 to operate. During operation, the oil pumping component 141 pumps the hydraulic oil in the oil tank 120 into the pipeline of the hydraulic lifting system 100, and then adjusts the opening and closing of each oil circuit between the actuator hydraulic cylinder 110 and the oil tank 120 through the control valve 130, so that the hydraulic oil can be pumped into the oil chamber of the actuator hydraulic cylinder 110 along the conductive oil circuit. For example, when the oil pumping component 140 pumps hydraulic oil into the rod oil chamber of the actuator hydraulic cylinder 110, the piston rod of the actuator hydraulic cylinder 110 retracts. When the oil pumping component 140 pumps hydraulic oil into the rodless oil chamber of the actuator hydraulic cylinder 110, the piston rod of the actuator hydraulic cylinder 110 extends. In this way, the piston rod of the actuator hydraulic cylinder 110 can be driven to reciprocate by the oil pumping component 140.

[0040] Furthermore, because the hydraulic lifting system 100 of the present application is provided with multiple independent driving components 142, and each driving component 142 can provide driving force for the oil pumping component 141, it can prevent the oil pumping component 141 from being unable to operate after losing its driving source due to a single driving source. As a result, the oil pumping component 141 can obtain driving force through multiple driving paths to continue to supply energy to the hydraulic lifting system 100, ensuring the normal operation of the hydraulic lifting system 100 and thereby improving the operational reliability of the hydraulic lifting system 100.

[0041] See also Figure 2 In some embodiments, in order to facilitate the coordination of multiple driving components 142 to power the hydraulic lifting system 100, at least two oil pumping components 141 are provided, and each oil pumping component 141 is connected to each driving component 142 one by one to form at least two oil pumps that operate independently of each other, so that any oil pump can pump the hydraulic oil in the oil tank 120 into the oil chamber of the actuator hydraulic cylinder 110.

[0042] It should be noted that when the oil pumping components 141 and the drive components 142 are connected in a one-to-one correspondence, each oil pumping component 141 cooperates with the corresponding drive component 142 to form multiple oil pumping assemblies 140, thereby providing the hydraulic lifting system 100 with multiple oil supply pumps that can switch between them. This makes not only the drive components 142 independent of each other, but also the oil pumping components 141, and the multiple oil supply pumps formed by the drive components 142 and the oil pumping components 141 are also independent of each other. Even if one oil supply pump is unavailable for some reason, the hydraulic lifting system 100 can still be powered by the other oil supply pumps. For example, if the hydraulic lifting system 100 has two oil supply pumps, one oil supply pump can serve as the main oil supply pump, and the other oil supply pump can serve as an emergency pump. In this way, even if the main oil supply pump is unavailable for some reason, the emergency pump can still be used to power the hydraulic lifting system 100.

[0043] For example, the oil supply pump formed by one of the oil pumping components 141 and one of the driving components 142 can be an electric pump, serving as the main oil supply pump. The oil supply pump formed by the other oil pumping component 141 and the other driving component 142 can be a manual pump, serving as an emergency pump. In this way, operators can power the hydraulic lifting system 100 using both a separate electric pump and a separate manual pump, maintaining normal operation of the hydraulic lifting system 100 and improving its reliability.

[0044] In addition, when the oil pumping member 141 and the driving member 142 are connected one-to-one, one oil pumping member 141 only needs to correspond to one driving mode, which can simplify the structure of the oil pumping assembly 140 and facilitate fault repair and assembly of the oil pumping assembly 140.

[0045] Of course, in other embodiments, the oil pumping components 141 and the driving components 142 may also be alternately matched, and this application does not impose any limitation thereto.

[0046] See also Figure 3 In some embodiments, to facilitate the hydraulic lifting system 100 driving the piston rod of the actuator hydraulic cylinder 110 to reciprocate and extend, the control valve 130 includes a primary reversing valve 131, and the actuator hydraulic cylinder 110 includes a primary hydraulic cylinder 111. An oil pumping component 141 is connected between the oil inlet of the primary reversing valve 131 and the oil tank 120. The oil return port of the primary reversing valve 131 is connected to the oil tank 120. The rodless oil chamber of the primary hydraulic cylinder 111 is connected to the working oil port A1 of the primary reversing valve 131, and the rod oil chamber of the primary hydraulic cylinder 111 is connected to the working oil port B1 of the primary reversing valve 131. The oil inlet and oil return port of the primary reversing valve 131 are switched between the working oil port A1 and the working oil port B1, respectively, so that the oil pumping component 140 switches oil pumping to the rod oil chamber and the rodless oil chamber of the primary hydraulic cylinder 111, respectively, to drive the piston rod of the primary hydraulic cylinder 111 to reciprocate and extend.

[0047] See also Figure 3 and Figure 4 It should be noted that the primary hydraulic cylinder 111 can be configured as a double-acting hydraulic cylinder. A double-acting hydraulic cylinder has two working oil chambers, each with an oil port. The rodless oil chamber of the double-acting hydraulic cylinder communicates with the working oil port A1 of the primary reversing valve 131, while the rod oil chamber of the double-acting hydraulic cylinder communicates with the working oil port B1 of the primary reversing valve 131, forming two inlet and outlet oil paths for the double-acting hydraulic cylinder.

[0048] For example, when the oil inlet of the primary reversing valve 131 is connected to the working oil port A1, and the oil return port of the primary reversing valve 131 is connected to the working oil port B1, any one of the oil pumping assemblies 140 can pump hydraulic oil into the rodless oil chamber of the double-acting hydraulic cylinder to drive the piston rod of the double-acting hydraulic cylinder to extend. When the oil inlet of the primary reversing valve 131 is connected to the working oil port B1, and the oil return port of the primary reversing valve 131 is connected to the working oil port A1, any one of the oil pumping assemblies 140 can pump hydraulic oil into the rod oil chamber of the double-acting hydraulic cylinder to drive the piston rod of the double-acting hydraulic cylinder to retract.

[0049] In this way, by switching the oil inlet and return ports of the first-stage reversing valve 131 between the working oil port A1 and the working oil port B1, the piston rod of the first-stage hydraulic cylinder 111 can be extended or retracted. Thus, when the piston rod of the first-stage hydraulic cylinder 111 is connected to the upper assembly of the aircraft refueling truck, it can drive the upper assembly to reciprocate. For example, if the upper assembly of the aircraft refueling truck is a ground support, during the refueling operation, the ground support can be lowered from the aircraft refueling truck to the airport ground, supporting it between the airport ground and the aircraft refueling truck. The lowered ground support can be used to support the aircraft refueling truck and to carry the ground well refueling hose from the aircraft refueling truck, allowing the aircraft refueling truck to connect the ground well refueling hose to the refueling port of the underground hydrant. After the aircraft refueling operation is completed, the ground support can be raised from the airport ground and retracted to the aircraft refueling truck. After the ground support is retracted, the aircraft refueling truck can be driven away from the refueling location and the ground support hose can be returned to the aircraft refueling truck. Thus, when the piston rod of the primary hydraulic cylinder 111 is connected to the ground frame of the aircraft refueling truck, the hydraulic lifting system 100 can achieve the raising and lowering of the ground frame. Among them, the number of double-acting hydraulic cylinders can be set according to specific use needs and is not limited in this application.

[0050] Furthermore, the primary reversing valve 131 can be configured with multiple operating positions according to the motion requirements of the primary hydraulic cylinder 111 and multiple port numbers according to the usage requirements of the hydraulic lifting system 100. For example, the primary reversing valve 131 can be a 2-position 4-way valve, a 2-position 5-way valve, a 3-position 4-way valve, a 3-position 5-way valve, or a 3-position 6-way valve, and the present application does not impose any limitation thereto.

[0051] As an example, the primary reversing valve 131 can be configured as a three-position, four-way valve. When the primary reversing valve 131 is in the neutral position, the oil inlet, oil return port, working oil port A1, and working oil port B1 of the primary reversing valve 131 are all blocked, the oil pump assembly 140 does not pump oil into the primary hydraulic cylinder 111, the hydraulic oil in the primary hydraulic cylinder 111 does not flow out, and the piston rod of the primary hydraulic cylinder 111 is in a fixed state. When the primary reversing valve 131 is in the left position, the oil inlet of the primary reversing valve 131 is connected to the working oil port B1, and the oil return port of the primary reversing valve 131 is connected to the working oil port A1. At this time, any of the oil pump assemblies 140 can pump oil into the rod oil chamber of the primary hydraulic cylinder 111, causing the piston rod of the primary hydraulic cylinder 111 to retract. When the first-stage reversing valve 131 is in the right position, the oil inlet of the first-stage reversing valve 131 is connected to the working oil port A1, and the oil return port of the first-stage reversing valve is connected to the working oil port B1. At this time, any oil pump assembly 140 can supply oil to the rodless oil chamber of the first-stage hydraulic cylinder 111, and the piston rod of the first-stage hydraulic cylinder 111 extends.

[0052] It should also be noted that the first-stage reversing valve 131 can be set as a manual reversing valve for manual control, or it can be set as an electromagnetic reversing valve for electric control, and this application does not impose any restrictions.

[0053] In some embodiments, in order to improve the movement reliability of the first-stage hydraulic cylinder 111, the hydraulic lifting system 100 further includes a hydraulically controlled one-way valve 160. The hydraulically controlled one-way valve 160 is connected between the first-stage reversing valve 131 and the first-stage hydraulic cylinder 111. The two oil inlets of the hydraulically controlled one-way valve 160 are respectively connected to the working oil port A1 and the working oil port B1 of the first-stage reversing valve 131 in a one-to-one correspondence. The two oil outlets of the hydraulically controlled one-way valve 160 are respectively connected to the rod oil chamber and the rodless oil chamber of the first-stage hydraulic cylinder 111 in a one-to-one correspondence. The control oil route of the hydraulically controlled one-way valve 160 is connected to the oil supply of each oil inlet of the hydraulically controlled one-way valve 160.

[0054] It should be noted that the hydraulically controlled check valve 160 acts as a valve between the two inlet and outlet oil passages of the primary hydraulic cylinder 111. Thus, when the primary reversing valve 131 is in the left position, any of the oil pumping assemblies 140 pumps oil into the primary reversing valve 131, and the working oil port B1 of the primary reversing valve 131 pumps oil into the rod oil chamber of the primary hydraulic cylinder 111. Oil is then supplied through the inlet of the hydraulically controlled check valve 160, located between the working oil port B1 and the rod oil chamber of the primary hydraulic cylinder 111. At this point, the control oil port of the hydraulically controlled check valve 160 is open, meaning that the check valve 160, located between the working oil port A1 and the rodless oil chamber of the primary hydraulic cylinder 111, allows reverse flow. This allows the hydraulic oil in the rod oil chamber of the primary hydraulic cylinder 111 to flow through the hydraulically controlled check valve 160 to the working oil port A1 of the primary reversing valve 131. This allows the oil in both working oil chambers of the primary hydraulic cylinder 111 to flow in and out, driving the piston rod of the primary hydraulic cylinder 111 to retract. Similarly, when the primary reversing valve 131 is in the right position, any oil pump assembly 140 pumps oil into the primary reversing valve 131, and the working oil port A1 of the primary reversing valve 131 pumps oil into the rodless oil chamber of the primary hydraulic cylinder 111. The hydraulically controlled one-way valve 160, located between the working oil port A1 and the rodless oil chamber of the primary hydraulic cylinder 111, then pumps oil into the oil inlet. At this point, the control oil port of the hydraulically controlled one-way valve 160 is also opened, meaning that the one-way valve 160, located between the working oil port B1 and the rodless oil chamber of the primary hydraulic cylinder 111, allows reverse flow. This is equivalent to the hydraulic oil in the rodless oil chamber of the primary hydraulic cylinder 111 being able to flow through the hydraulically controlled one-way valve 160 to the working oil port B1 of the primary reversing valve 131. As a result, the oil in the two working oil chambers of the primary hydraulic cylinder 111 can flow in and out, driving the piston rod of the primary hydraulic cylinder 111 to extend. In the middle position of the first-stage reversing valve 131, the working oil port A1 and the working oil port B1 of the first-stage reversing valve 131 are not connected, the oil pump assembly 140 does not pump oil to the first-stage reversing valve 131, and no hydraulic oil enters the two oil inlets of the hydraulically controlled one-way valve 160. The control oil circuit of the hydraulically controlled one-way valve 160 is not connected, and the hydraulically controlled one-way valve 160 does not allow reverse flow. The oil in the two working oil chambers of the first-stage hydraulic cylinder 111 cannot flow in or out, thereby preventing the piston rod of the first-stage hydraulic cylinder 111 from moving due to external force, thereby achieving the locking of the upper assembly connected to the piston rod in the working position or the storage position.

[0055] See also Figure 3 and Figure 4 In some embodiments, in order to avoid excessive pressure in each pipeline in the hydraulic lifting system 100, the hydraulic lifting system 100 also includes a relief valve 150, the oil inlet of the relief valve 150 is connected between the oil pump 141 and the oil inlet of the first-stage reversing valve 131, and the oil outlet of the relief valve 150 is connected to the oil tank 120.

[0056] It should be noted that the overflow valve 150 can pre-set the pipeline oil pressure value. When the oil pressure pumped into the hydraulic lifting system 100 by the oil pump assembly 140 exceeds the oil pressure value set by the overflow valve 150, the overflow valve 150 will automatically open and guide the excess hydraulic oil back to the oil tank 120, thereby avoiding excessive pressure in the pipelines in the hydraulic lifting system 100.

[0057] The present application does not limit the location and number of the relief valves 150. For example, the oil inlet of the relief valve 150 can be connected between the oil pump 141 and the oil inlet of the first-stage reversing valve 131 to adjust the pipeline pressure between the oil pump 141 and the first-stage reversing valve 131 and prevent the first-stage reversing valve 131 from being damaged by oil pressure shock. The oil inlet of the relief valve 150 can also be connected between the working oil port of the first-stage reversing valve 131 and the first-stage hydraulic cylinder 111 to adjust the pipeline pressure between the first-stage reversing valve 131 and the first-stage hydraulic cylinder 111 and prevent the first-stage hydraulic cylinder 111 or the hydraulically controlled one-way valve 160 from being damaged by oil pressure shock.

[0058] See also Figure 3 and Figure 4 In some embodiments, to improve the oil pumping efficiency of the oil pump assembly 140 for the actuator hydraulic cylinder 110, the oil outlet of the relief valve 150 can also be connected between the oil return port of the primary reversing valve 131 and the oil tank 120. One of the rodless oil chamber and the rod oil chamber of the primary hydraulic cylinder 111 is also connected between the oil outlet of the relief valve 150 and the oil tank 120, forming an inlet and outlet oil path for the primary hydraulic cylinder 111. The control valve 130 also includes a primary on-off valve 132, which is used to control the flow of the inlet and outlet oil paths of the primary hydraulic cylinder 111.

[0059] With this arrangement, when the first-stage on-off valve 132 is in the on state, the hydraulic oil flowing out of the oil outlet of the overflow valve 150 or the hydraulic oil flowing out of the oil return port of the first-stage reversing valve 131 can also enter the working oil chamber of the first-stage hydraulic cylinder 111 through the first-stage on-off valve 132, so as to increase the oil pumping path of the oil pumping assembly 140 for the first-stage hydraulic cylinder 111, thereby improving the oil pumping efficiency.

[0060] For example, when the rodless oil chamber of the first-stage hydraulic cylinder 111 is connected between the oil outlet of the relief valve 150 and the oil tank 120, in the right position of the first-stage reversing valve 131, the oil inlet of the first-stage reversing valve 131 is connected to the working oil port A1, and the oil return port of the first-stage reversing valve 131 is connected to the working oil port B1. At this time, any of the oil pumping assemblies 140 supplies oil to the rodless oil chamber of the first-stage hydraulic cylinder 111. When the first-stage on-off valve 132 is in the on state, hydraulic oil flowing out of the oil outlet of the relief valve 150 and the oil return port of the first-stage reversing valve 131 can also pass through the first-stage on-off valve 132 and enter the rodless oil chamber of the first-stage hydraulic cylinder 111, thereby increasing the oil pumping path of the oil pumping assembly 140 to the rodless oil chamber of the first-stage hydraulic cylinder 111, thereby quickly filling the rodless oil chamber of the first-stage hydraulic cylinder 111 with hydraulic oil, driving the piston rod of the first-stage hydraulic cylinder 111 to extend, and improving the extension efficiency of the first-stage hydraulic cylinder 111.

[0061] Furthermore, when the primary reversing valve 131 is in the left position, the oil inlet of the primary reversing valve 131 communicates with the working oil port B1, and the oil return port of the primary reversing valve 131 communicates with the working oil port A1. At this time, any one of the oil pumping assemblies 140 supplies oil to the rod-operated oil chamber of the primary hydraulic cylinder 111. When the primary on-off valve 132 is in the on state, the hydraulic oil in the rodless oil chamber of the primary hydraulic cylinder 111 can also be discharged to the oil tank 120 through the primary on-off valve 132, thereby accelerating the discharge of the hydraulic oil from the rodless oil chamber of the primary hydraulic cylinder 111 and thereby increasing the retraction speed of the piston rod of the primary hydraulic cylinder 111.

[0062] In this way, when the piston rod of the first-stage hydraulic cylinder 111 is used to connect the anchor of the aircraft refueling truck, the anchor can be quickly extended to the ground, or quickly lifted up and retracted, so as to improve the refueling efficiency of the aircraft refueling truck and enable the aircraft refueling truck to be quickly evacuated from under the wing to ensure that the aircraft takes off on time.

[0063] Of course, in other embodiments, the rod oil chamber of the first-stage hydraulic cylinder 111 can also be connected between the oil outlet of the overflow valve 150 and the oil tank 120 to increase the flow rate of the hydraulic oil in the rod oil chamber of the first-stage hydraulic cylinder 111, thereby improving the operating efficiency of the hydraulic lifting system 100. This application will not go into details.

[0064] In addition, according to the operation requirements of the hydraulic lifting system 100, the hydraulic lifting system 100 may further include a regulating valve, which may be a speed regulating valve or a pressure regulating valve, etc., and this application does not impose any restrictions.

[0065] See also Figure 5In some embodiments, the hydraulic lifting system 100 may further include multiple actuator hydraulic cylinders to respectively connect to multiple external working mechanisms through the multiple actuator hydraulic cylinders. The multiple external working mechanisms may be the upper components of an aircraft refueling truck. For example, the upper components include a ground frame and a refueling platform. The refueling platform can be used for the aircraft refueler to sit close to the refueling port under the wing and connect the refueling pipe of the aircraft refueling truck to the aircraft refueling port. In this way, the actuator hydraulic cylinder 110 also includes a secondary hydraulic cylinder 112, and the control valve 130 also includes a secondary on-off valve 133. The working oil chamber of the secondary hydraulic cylinder 112 is connected between the primary on-off valve 132 and the oil tank 120, forming the inlet and outlet oil circuit of the secondary hydraulic cylinder 112. The secondary on-off valve 133 is used to control the conduction or disconnection of the inlet and outlet oil circuit of the secondary hydraulic cylinder 112.

[0066] Thus, when the secondary on-off valve 133 opens the inlet and outlet oil passages of the secondary hydraulic cylinder 112, the hydraulic oil flowing out of the oil outlet of the relief valve 150 and the hydraulic oil flowing out of the oil return port of the primary reversing valve 131 can also flow into the oil chamber of the secondary hydraulic cylinder 112, supplying oil to the secondary hydraulic cylinder 112 and driving the piston rod of the secondary hydraulic cylinder 112. Thus, the hydraulic lifting system 100 can drive multiple external working mechanisms to operate separately.

[0067] It should be noted that to reduce the energy consumption of the hydraulic lift system 100, the secondary hydraulic cylinder 112 can be configured as a single-acting hydraulic cylinder. A single-acting hydraulic cylinder has a single working oil chamber and can be reset by an external force such as a spring or gravity. For example, the rodless oil chamber of the single-acting hydraulic cylinder serves as the working oil chamber, while the rod chamber of the single-acting hydraulic cylinder can be reset by gravity or elastic force. Thus, when the rodless oil chamber of the secondary hydraulic cylinder 112 is empty, i.e., when the piston rod of the secondary hydraulic cylinder 112 is retracted, if the secondary on-off valve 133 opens the inlet and outlet oil passages of the secondary hydraulic cylinder 112 and the oil pump assembly 140 starts pumping oil into the hydraulic lift system 100, hydraulic oil flowing out of the return port of the primary reversing valve 131 and the oil outlet of the relief valve 150 can flow into the rodless oil chamber of the secondary hydraulic cylinder 112, compressing the elastic member on the rod oil chamber side of the secondary hydraulic cylinder 112, causing the piston rod of the secondary hydraulic cylinder 112 to extend. If the secondary on-off valve 133 is closed again, oil will no longer flow into the rodless oil chamber of the secondary hydraulic cylinder 112, and the piston rod of the secondary hydraulic cylinder 112 will remain in the extended state. When there is hydraulic oil in the rodless oil chamber of the secondary hydraulic cylinder 112, that is, when the piston rod of the secondary hydraulic cylinder 112 is in the extended state, if the secondary on-off valve 133 connects the inlet and outlet oil passages of the secondary hydraulic cylinder 112, there is no need for the oil pump assembly 140 to pump oil into the hydraulic lifting system 100. The side of the rod oil chamber of the secondary hydraulic cylinder 112 can restore elastic deformation through the elastic member, squeeze out the hydraulic oil in the rodless oil chamber of the secondary hydraulic cylinder 112, and retract the piston rod of the secondary hydraulic cylinder 112.

[0068] With this arrangement, when the oil pump assembly 140 is a manual pump, or when the operator can manually provide pumping power to the oil pump component 141 via a power take-off, the operator only manually pumps oil into the rodless oil chamber of the single-acting hydraulic cylinder when the piston rod of the single-acting hydraulic cylinder needs to be extended. When the operator needs to retract the piston rod of the single-acting hydraulic cylinder, there is no need for the operator to manually pump oil again; the piston rod of the single-acting hydraulic cylinder can be retracted by external forces such as elastic force or gravity. Thus, when the oil pump assembly 140 is a manual pump, the secondary hydraulic cylinder 112 acts as a single-acting hydraulic cylinder, saving the operator the physical effort of manually pumping oil. Furthermore, when the oil pump assembly 140 is an electric pump, the energy consumption of the electric pump can also be saved. As an example, the piston rod of the secondary hydraulic cylinder 111 can be connected to the refueling platform of an aircraft refueling truck to drive the refueling platform of the aircraft refueling truck to move. In this way, the oil pumping assembly 140 only needs to start pumping oil when the operator ascends the refueling platform to approach the wing refueling port, and does not need to pump oil when the operator descends the refueling platform to move away from the wing refueling port.

[0069] In addition, the number of secondary hydraulic cylinders 112 can be set according to usage needs, and this application does not impose any restrictions.

[0070] In some embodiments, to ensure smooth operation of the piston rod of the secondary hydraulic cylinder 112 driven by the oil pump assembly 140, the hydraulic lifting system 100 further includes a one-way speed regulating valve 170. The one-way speed regulating valve 170 acts on the inlet and outlet oil passages of the secondary hydraulic cylinder 112. The oil inlet of the one-way speed regulating valve 170 is connected between the primary on-off valve 132 and the oil tank 120, while the oil outlet of the one-way speed regulating valve 170 is connected to the rodless oil chamber of the secondary hydraulic cylinder 112. The oil inlet of the one-way speed regulating valve 170 is connected to the rodless oil chamber of the secondary hydraulic cylinder 112, while the oil outlet of the one-way speed regulating valve 170 is connected between the primary on-off valve 132 and the oil tank 120.

[0071] Thus, when the oil pump assembly 140 pumps oil to the secondary hydraulic cylinder 112, the one-way speed regulating valve 170 regulates the oil supply rate from the oil pump assembly 140 to the secondary hydraulic cylinder 112, driving the piston rod of the secondary hydraulic cylinder 112 to extend at a steady rate. Furthermore, when the piston rod of the secondary hydraulic cylinder 112 retracts, the hydraulic oil in the rodless oil chamber of the secondary hydraulic cylinder 112 is allowed to flow to the oil tank 120 without excessively restricting the retraction speed of the piston rod of the secondary hydraulic cylinder 112. This enables the secondary hydraulic cylinder 112 to smoothly ascend and quickly retract during operation. For example, when the hydraulic lift system 100 is used in an aircraft refueling truck, the secondary hydraulic cylinder 112 can drive the refueling platform of the aircraft refueling truck, allowing the platform to smoothly ascend from under the aircraft wing, avoiding collisions with the wing and ensuring the safety of the operator while riding on the platform. Furthermore, after the operator completes the refueling operation on the platform, they can quickly return to the refueling truck on the platform to avoid delaying the aircraft's takeoff.

[0072] In addition, the number of one-way speed regulating valves 170 is not limited in this application and can be determined according to actual needs. Each one-way speed regulating valve 170 can be used alone or in combination. The speed regulation range of each one-way speed regulating valve 170 is also not limited in this application.

[0073] The primary on-off valve 132 and the secondary on-off valve 133 can be valves such as reversing valves or stop valves used to control the on-off of the pipeline, and this application does not impose any restrictions.

[0074] See also Figure 6 In some embodiments, in order to facilitate the operator to pump oil into the secondary hydraulic cylinder 112, the rodless oil chamber of the secondary hydraulic cylinder 112 is also connected to the working oil port C1 of the primary reversing valve 131, and the oil inlet of the primary reversing valve 131 is switched between the working oil port A1, the working oil port B1 and the working oil port C1, so that the oil pumping assembly 140 pumps oil to at least one of the primary hydraulic cylinder 111 and the secondary hydraulic cylinder 112 through the primary reversing valve 131.

[0075] With this arrangement, the primary hydraulic cylinder 111 and the secondary hydraulic cylinder 112 can be connected to different working oil ports of the primary reversing valve 131. By switching the valve core position of the primary reversing valve 131, the flow direction of the hydraulic oil pumped out by the oil pump assembly 140 can be controlled and adjusted, so that the hydraulic oil is pumped into at least one of the primary hydraulic cylinder 111 and the secondary hydraulic cylinder 112, thereby driving the piston rods of each hydraulic cylinder. In this way, operators can pump oil into the secondary hydraulic cylinder 112 via the hydraulic oil returned from the relief valve 150 and the primary reversing valve 131, or directly pump oil into the secondary hydraulic cylinder 112 through the working oil port C1 of the primary reversing valve 131, thereby enriching the oil pumping paths for the secondary hydraulic cylinder 112 and improving the pumping efficiency of the secondary hydraulic cylinder 112.

[0076] As an example, when the oil pumping assembly 140 pumps oil for the secondary hydraulic cylinder 112 via the primary reversing valve 131, the secondary on-off valve 133 is in the on state. At this time, the hydraulic oil flowing out of the relief valve 150 can also pump oil for the secondary hydraulic cylinder 112. That is, the oil pumping assembly 140 can pump oil for the secondary hydraulic cylinder 112 via two oil pumping paths, which can both relieve the pressure in the oil pumping line and increase the oil supply speed of the secondary hydraulic cylinder 112, thereby saving oil pumping time and improving the operating efficiency of the hydraulic lifting system 100.

[0077] As an example, when the oil pumping assembly 140 pumps oil for the primary hydraulic cylinder 111 via the primary reversing valve 131, if the operator also opens the secondary on-off valve 133 to open the inlet and outlet oil passages of the secondary hydraulic cylinder 112, the hydraulic oil flowing out of the relief valve 150 and the hydraulic oil flowing out of the oil return port of the primary reversing valve 131 can also pump oil for the secondary hydraulic cylinder 112. Thus, the oil pumping assembly 140 can pump oil for both the primary hydraulic cylinder 111 and the secondary hydraulic cylinder 112 separately, that is, the oil pumping assembly 140 can drive at least two hydraulic cylinders to operate separately by performing work, thereby improving the operating efficiency of the hydraulic lifting system 100.

[0078] In addition, the first-level hydraulic cylinder 111 and the second-level hydraulic cylinder 112 are connected by the above-mentioned pipeline method, and the oil pumping component 140 can have multiple oil pumping paths to pump oil for at least one of the first-level hydraulic cylinder 111 and the second-level hydraulic cylinder 112. If one of the pipelines of the hydraulic lifting system 100 fails, the operator can also enable the oil pumping component 140 to continue pumping oil for the corresponding hydraulic cylinder through other oil pumping paths to perform emergency operations and ensure the stable operation of the hydraulic lifting system 100.

[0079] See also Figure 7 and Figure 8 In some embodiments, when the oil pumping assembly 140 pumps oil for the primary hydraulic cylinder 111 and the secondary hydraulic cylinder 112, the structure of the primary reversing valve 131 can be adjusted to facilitate the operator to control the flow direction of the hydraulic oil through the primary reversing valve 131 to ensure that each hydraulic cylinder can operate stably.

[0080] As an example, to facilitate the connection between the primary hydraulic cylinder 111 and the secondary hydraulic cylinder 112, while also sharing the oil inlet pressure of each pipeline, the oil inlet of the primary reversing valve 131 may include an oil inlet P1 and an oil inlet P1'. The oil inlet P1 is connected to the oil pumping component 141, and the oil inlet P1' is connected between the oil inlet P1 and the oil pumping component 141. At the same time, the oil inlet of the relief valve 150 is connected between the oil inlet P1' and the oil pumping component 141 to regulate the pipeline pressure of the oil inlets P1 and P1'. The working oil port C1 of the primary reversing valve 131 is connected between the primary on-off valve 132, the secondary on-off valve 133, and the oil tank 120.

[0081] When the hydraulic lifting system 100 is in operation, the working position of the valve core of the first-stage reversing valve 131 can be adjusted to conduct different connecting oil circuits and control the actions of each hydraulic cylinder.

[0082] For example, the primary reversing valve 131 is configured as follows:

[0083] In the middle position of the primary reversing valve 131, the oil inlet P1 of the primary reversing valve 131 is connected to the working oil port C1, the oil return port, oil inlet P1', working oil port A1 and working oil port B1 of the primary reversing valve 131 are respectively closed, and the oil pumping assembly 140 pumps oil to the secondary hydraulic cylinder 112.

[0084] In one of the normally open positions of the first-stage reversing valve 131, the oil inlet P1' of the first-stage reversing valve 131 is connected to one of the working oil port A1 and the working oil port B1, the oil return port of the first-stage reversing valve 131 is connected to the other of the working oil port A1 and the working oil port B1, the oil inlet P1 and the working oil port C1 are closed, and the oil pump assembly 140 pumps oil to the first-stage hydraulic cylinder 111.

[0085] See also Figure 7 and Figure 8 , below, taking the application of the hydraulic lifting system 100 to an aircraft refueling truck as an example, the operating status of the first-level reversing valve 131 in different working positions is explained. The piston rod of the first-level hydraulic cylinder 111 is connected to the ground frame of the aircraft refueling truck, and the piston rod of the second-level hydraulic cylinder 112 is connected to the refueling platform of the aircraft refueling truck. Among them, the ground frame is used to support the vehicle body when the aircraft refueling truck is operating, and at the same time, the ground well refueling pipe on the vehicle body can be lifted and lowered relative to the chassis of the refueling truck with the ground frame, so that the operating personnel can carry the ground well refueling pipe and disconnect it from the ground well. The refueling platform is used to carry the aircraft refueler to carry the aircraft refueling pipe, so that the aircraft refueler can approach or move away from the refueling port under the wing, disconnect the aircraft refueling pipe from the aircraft refueling port, and then complete the aircraft refueling operation.

[0086] Specifically, when the aircraft refueling truck is refueling, the first-stage reversing valve 131 can be placed in the right position, so that the oil inlet P1' of the first-stage reversing valve 131 is connected to the working oil port A1, the oil return port is connected to the working oil port B1, and the oil inlet P1 and working oil port C1 are blocked. The second-stage on-off valve 133 is closed. The second-stage hydraulic cylinder 112 is not actuated. The first-stage on-off valve 132 can be opened or closed according to usage requirements. In this way, when the aircraft refueling truck reaches the refueling position (such as under a wing), the operator places the first-stage reversing valve 131 in the right position. The oil pump assembly 140 flows oil into the rodless oil chamber of the first-stage hydraulic cylinder 111 through the first-stage reversing valve 131, and oil flows out of the rod oil chamber of the first-stage hydraulic cylinder 111, causing the piston rod of the first-stage hydraulic cylinder 111 to extend, driving the ground frame to descend relative to the vehicle chassis to support and fix it on the airport ground, thus fixing the aircraft refueling truck in the refueling position. At the same time, as the ground frame descends, it can carry the ground well refueling pipe down to the airport floor, making it convenient for operators to carry the ground well refueling pipe and connect it to the ground well.

[0087] The operator positions the primary reversing valve 131 in the neutral position, connecting its oil inlet P1 to the working oil port C1. The oil inlet P1', working oil port A1, working oil port B1, and the oil return port are all blocked. The secondary on-off valve 133 is open, and the primary on-off valve 132 is closed. At this point, the oil chamber of the primary hydraulic cylinder 111 is sealed, its piston rod is extended, and the anchor is in a fixed support position. The oil pump assembly 140 pumps oil through the primary reversing valve 131 into the rodless oil chamber of the secondary on-off valve 133, extending the piston rod of the secondary hydraulic cylinder 112 and driving the refueling platform upward, allowing the operator to ride the platform closer to the wing. After the refueling platform reaches the refueling position, the operator closes the secondary on-off valve 133, maintaining the platform in a fixed position. The operator then connects the aircraft refueling pipe to the aircraft refueling port, transferring the aviation fuel from the ground well to the aircraft's fuel tank 120. After the aircraft is refueled, the operator can open the secondary on-off valve 133, so that the hydraulic oil in the rodless oil chamber of the secondary hydraulic cylinder 112 is squeezed out by gravity by the refueling platform, and the piston rod of the secondary hydraulic cylinder 112 is retracted to realize the lowering of the refueling platform.

[0088] The operator positions primary reversing valve 131 in the left position, connecting its oil inlet P1' to the working oil port B1 and its oil return port to the working oil port A1. This blocks oil inlet P1 and working oil port C1. At this point, oil pump assembly 140 flows through primary reversing valve 131 into the rod-operated oil chamber of primary hydraulic cylinder 111. The piston rod of primary hydraulic cylinder 111 retracts, driving the ground support to rise. This allows the aircraft refueling truck to move away from the refueling position under the wing after completing the refueling operation, thus avoiding delays in takeoff.

[0089] See also Figure 7In some embodiments, to improve the oil pumping efficiency of the secondary hydraulic cylinder 112, the control valve further includes a three-stage on-off valve 134. The oil pumping element 141 is also connected to the inlet and outlet oil passages of the secondary hydraulic cylinder 112, and is connected between the secondary hydraulic cylinder 112 and the two-stage on-off valve 133. The three-stage on-off valve 134 is used to open and close the connection between the oil pumping element 141 and the secondary hydraulic cylinder 112, allowing the oil pumping assembly 140 to pump oil to the secondary hydraulic cylinder 112 through the three-stage on-off valve 134.

[0090] In this way, the oil pumping assembly 140 can also directly pump oil to the secondary hydraulic cylinder 112 through the three-stage on-off valve 134, without pumping oil through the first-stage reversing valve 131, thereby shortening the oil pumping path to the secondary hydraulic cylinder 112 and improving the oil pumping efficiency of the secondary hydraulic cylinder 112. When the oil pumping assembly 140 is a manual pump, it can save the operator's physical strength in manually pumping oil. When the oil pumping assembly 140 is an electric pump, it can reduce the energy consumption of the electric pump. Among them, the three-stage on-off valve 134 can be a control valve such as a reversing valve or a stop valve for opening and closing the pipeline, and this application does not impose any restrictions.

[0091] In addition, when the secondary hydraulic cylinder 112 is a single-acting hydraulic cylinder, in order to prevent the hydraulic oil in the single-acting hydraulic cylinder from flowing back to the oil pump assembly 140 and leaking, the hydraulic lifting system 100 also includes an emergency one-way valve, the oil inlet of the emergency one-way valve is connected to the oil pump component 141, and the oil outlet of the emergency one-way valve is connected between the rodless oil chamber of the single-acting hydraulic cylinder and the one-way speed regulating valve 170, so that the oil pump component 141 pumps hydraulic oil into the rodless oil chamber of the single-acting hydraulic cylinder, and prevents the hydraulic oil in the single-acting hydraulic cylinder from flowing back to the oil pump component 141.

[0092] In some embodiments, the hydraulic lifting system 100 can also be used to drive other hydraulic actuators, such as hydraulic motors or hydraulic pumps, which are not described in detail in this application.

[0093] The hydraulic lifting system 100 can be applied to any equipment that requires lifting motion, and this application does not impose any restrictions. Below, this application will take the application of the hydraulic lifting system 100 to an aircraft refueling truck as an example for explanation.

[0094] See also Figure 9 and Figure 10 The present application also provides an aircraft refueling vehicle 300, which includes a vehicle body 310, a top assembly, and the aforementioned hydraulic lifting system 100. The top assembly includes at least one of a ground support 320 and a refueling platform 330 mounted on the vehicle body 310. The piston rod of the actuator hydraulic cylinder 110 is connected to the top assembly.

[0095] It should be noted that aircraft refueling trucks 300 include tank-type refueling trucks 300 and pipeline-type refueling trucks 300. The upper assembly of the tank-type refueling truck 300 includes a refueling platform 330, which can be driven by the hydraulic lifting system 100 to raise or lower the refueling platform 330 relative to the vehicle body 310 to assist operators in refueling aircraft. The upper assembly of the pipeline-type refueling truck 300 includes a refueling platform 330 and a ground support 320, which can be driven by the hydraulic lifting system 100 to assist operators in refueling aircraft.

[0096] At the same time, one of the driving components 142 can include the power system of the aircraft refueling truck 300. That is, the power system of the aircraft refueling truck 300 can be used to drive the oil pumping component 141 of the hydraulic lifting system 100 to supply energy to the hydraulic lifting system 100. Furthermore, other driving components 142 can be power sources independent of the power system of the aircraft refueling truck 300. In this way, the hydraulic lifting system 100 of the aircraft refueling truck 300 can be powered by both the aircraft refueling truck 300's own power system and a power system independent of the aircraft refueling truck 300, thereby enriching the driving methods of the hydraulic lifting system 100 and preventing the oil pumping component 141 of the hydraulic lifting system 100 from being unable to operate due to lack of a power source. As a result, the hydraulic lifting system 100 can drive the refueling platform 330 and the ground support 320 of the aircraft refueling truck 300, and other upper components to operate stably, ensuring the smooth completion of aircraft refueling operations, ensuring on-time and timely takeoff and departure of aircraft, and maintaining stable airport operations.

[0097] In addition, if Figure 9 and Figure 10 As shown, in addition to upper components such as the refueling platform 330 and the ground frame 320, the aircraft refueling vehicle 300 also includes other operating components, such as the refueling hose reel 340 and the oil pump 240. These components can also be driven hydraulically. Therefore, the hydraulic lifting system 100 can also drive these operating components, forming the hydraulic system 200 of the aircraft refueling vehicle.

[0098] As an example, when the hydraulic system 200 of the aircraft refueling truck drives the refueling hose reel 340 to reel in or unreel, the hydraulic motor 210 can serve as a hydraulic actuator. In this case, the hydraulic system 200 of the aircraft refueling truck also includes a secondary reversing valve 220. The working oil ports A2 and B2 of the secondary reversing valve 220 are respectively connected to the working oil chamber of the hydraulic motor 210, forming two inlet and outlet oil paths for the hydraulic motor 210. The oil inlet of the secondary reversing valve 220 is connected between the working oil port C1 of the primary reversing valve 131, the secondary on-off valve 133, and the fuel tank 120. The oil return port of the secondary reversing valve 220 is connected between the oil outlet of the relief valve 150 and the fuel tank 120. The oil inlet and oil return port of the secondary reversing valve 220 are switched and connected to the working oil port A2 and the working oil port B2 respectively, so that the oil pumping assembly 140 pumps oil to the hydraulic motor 210 through the secondary reversing valve 220, driving the output shaft of the hydraulic motor 210 to reciprocate forward and reverse, and then the refueling pipe is reeled in or out through the forward and reverse rotation of the hydraulic motor 210.

[0099] In order to facilitate the driving of the secondary hydraulic cylinder 112 and the hydraulic motor 210, so that the aircraft refueler can drive the refueling pipe to move when riding on the refueling platform 330, the working oil port C2 of the secondary reversing valve 220 is also connected to the rodless oil chamber of the secondary hydraulic cylinder 112.

[0100] Specifically, the secondary reversing valve 220 is configured such that, in its neutral position, the oil inlet of the secondary reversing valve 220 communicates with the working oil port C1, the oil return port of the secondary reversing valve 220 communicates with the fuel tank 120, and the working oil port A2 of the secondary reversing valve 220 communicates with the working oil port B2. At this point, the oil inlet and oil outlet of the hydraulic motor 210 are connected, and the output shaft of the hydraulic motor 210 is in a floating state, allowing the operator to manually pull out the reeled refueling hose. Thus, when the oil pump assembly 140 pumps oil into the rodless oil chamber of the secondary hydraulic cylinder 112 through the working oil port C2 of the secondary reversing valve 220, the piston rod of the secondary hydraulic cylinder 112 drives the refueling platform 330 upward. The aircraft refueler, carrying the refueling platform 330, grasps the refueling hose and ascends with the platform 330 toward the wing refueling port. The refueling hose, in its floating state, can gradually unwind as the platform 330 ascends, thereby continuously lengthening the refueling hose to meet the connection requirements of the wing refueling port.

[0101] In one of the normally open positions of secondary reversing valve 220, the oil inlet of secondary reversing valve 220 communicates with working oil port C2, while working oil ports A2, B2, and the oil return port are blocked. At this point, the oil chamber of hydraulic motor 210 is sealed, the output shaft of hydraulic motor 210 is fixed, and the extended length of the refueling pipe remains unchanged. Thus, when secondary on-off valve 133 is closed, refueling platform 330 maintains its elevated altitude and the refueling pipe maintains its connection length to the wing refueling port, ensuring a stable connection between the refueling pipe and the wing refueling port and enabling continuous refueling of the aircraft.

[0102] In the other normally open position of secondary reversing valve 220, the oil inlet of secondary reversing valve 220 is connected to working oil port A2, the oil return port is connected to working oil port B2, and working oil port C2 is blocked. At this point, the oil chamber of hydraulic motor 210 is connected between oil pump assembly 140 and fuel tank 120. Oil pump assembly 140 can pump oil into the oil chamber of hydraulic motor 210 through secondary reversing valve 220, driving hydraulic motor 210 to rotate and reel the refueling hose. In this way, after refueling, the aircraft refueler can disconnect the refueling hose from the wing refueling port and descend away from the wing refueling port on refueling platform 330. At this point, oil pump assembly 140 can pump oil into the oil chamber of hydraulic motor 210, driving the output shaft of hydraulic motor 210 to rotate and reel the refueling hose back onto the reel.

[0103] The secondary reversing valve 220 can be set with the number of working oil ports, the number of working positions and the mid-position function according to actual use requirements, and this application does not impose any restrictions.

[0104] In addition, in order to facilitate the adjustment of the reeling or unreeling speed of the refueling hose reel 340, the hydraulic system 200 of the aircraft refueling truck may also include a speed regulating valve or a one-way speed regulating valve, which is not limited in this application.

[0105] In some embodiments, to facilitate connecting the hydraulic system 200 of the aircraft refueling truck to other operating components or adjusting the oil pumping path of the secondary reversing valve 220, the hydraulic system 200 of the aircraft refueling truck further includes a tertiary reversing valve 230. The oil inlet of the tertiary reversing valve 230 is connected to the working oil port C2 of the secondary reversing valve 220. The oil return port of the tertiary reversing valve 230 is connected to the oil return port of the secondary reversing valve 220, the oil outlet of the relief valve 150, and the fuel tank 120. The working oil port A3 of the tertiary reversing valve 230 is connected between the secondary on-off valve 133 and the rodless oil chamber of the secondary hydraulic cylinder 112. The working oil port B3 of the tertiary reversing valve 230 is connected to other operating components or is closed. The oil inlet and oil return port of the tertiary reversing valve 230 are switchably connected to the working oil port A3 and the working oil port B3, respectively, allowing the oil pumping assembly 140 to pump oil to the secondary hydraulic cylinder 112 or other operating components through the tertiary reversing valve 230.

[0106] It should be noted that the three-stage reversing valve 230 can be set as a three-position four-way valve, a three-position six-way valve or a combination valve, etc., and this application does not impose any restrictions. By actuating the three-stage reversing valve 230, the operator switches the oil ports of the three-stage reversing valve 230 to conduct, and the hydraulic oil flowing out of the secondary reversing valve 220 can be directed into the secondary hydraulic cylinder 112 to drive the piston rod of the secondary hydraulic cylinder 112 to drive the refueling platform 330 to rise and fall. Of course, the operator can also actuate the three-stage reversing valve 230 to direct the hydraulic oil flowing out of the secondary reversing valve 220 into other operating components to drive other operating components to operate. Alternatively, the operator can also guide the hydraulic oil flowing out of the secondary reversing valve 220 back to the oil tank 120 to unload, etc., and this application does not impose any restrictions. The three-stage reversing valve 230 can be set according to actual use requirements to set the number of working oil ports, the number of working positions and the neutral position function, and this application does not impose any restrictions.

[0107] In some embodiments, when an operator needs to operate the oil pump 240 of the aircraft refueling truck 300 to extract aviation fuel from the aircraft fuel tank 120, the operator can rely on the hydraulic oil in the aircraft refueling truck's hydraulic system 200 to drive the oil pump 240. The oil pump 240, which includes a hydraulic pump such as a vane pump or a plunger pump, can serve as a hydraulic actuator in the oil pump 240 of the aircraft refueling truck 300. In this case, the aircraft refueling truck's hydraulic system 200 also includes a four-stage reversing valve 250 and the oil pump 240, which operates with hydraulic oil. The oil inlet of the four-stage reversing valve 250 is connected to the working oil port C1 of the first reversing valve 131, the second on-off valve 133, and the fuel tank 120. The working oil port A4 of the four-stage reversing valve 250 is connected to the oil inlet of the second reversing valve 220. The working oil port B4 of the four-stage reversing valve is connected to the oil outlet of the relief valve 150 and the fuel tank 120. The oil pump 240 is connected between the working oil port B4 of the four-stage reversing valve 250 and the oil tank 120. The oil inlet of the four-stage reversing valve 250 switches between the working oil port A4 and the working oil port B4 of the four-stage reversing valve to control the start and stop of the oil pump 240. The four-stage reversing valve 250 can be configured with the number of working oil ports, the number of working positions, and the neutral position function according to actual usage requirements, and this application does not impose any restrictions.

[0108] In some embodiments, in order to facilitate the adjustment of the oil pressure of the hydraulic system 200 of the aircraft refueling truck 300 and the action sequence or action speed of each hydraulic actuator, the hydraulic system 200 of the aircraft refueling truck also includes a combination valve 260. As an example, the combination valve 260 can act between the working oil port C1 of the first-level reversing valve 131, the second-level on-off valve 133 and the oil inlet of the fourth-level reversing valve 250. In addition, the various hydraulic actuators (hydraulic cylinders, hydraulic motors or hydraulic pumps, etc.) on the aircraft refueling truck 300 can operate individually, in combination or simultaneously, etc., and this application does not impose any restrictions. In addition, the hydraulic system 200 of the aircraft refueling truck can also be provided with an oil pressure gauge 270 to monitor the pipeline oil pressure, which is not described in detail in this application. This application does not describe other equipment on the aircraft refueling truck.

Claims

1. A hydraulic lifting system, characterized in that: include: Actuating hydraulic cylinder (110); An oil tank (120) is communicated with the oil chamber of the actuator hydraulic cylinder (110); a control valve (130) for controlling the connection or disconnection of each oil circuit between the actuator hydraulic cylinder (110) and the oil tank (120); and The oil pump assembly (140) comprises an oil pump component (141) and at least two driving components (142). The oil pump component (141) acts on the oil inlet between the actuator hydraulic cylinder (110) and the oil tank (120). The driving components (142) operate independently of each other. When the control valve (130) is in the conducting state, any one of the driving components (142) drives the oil pump component (141) to operate, so that the hydraulic oil in the oil tank (120) is pumped into the oil chamber of the actuator hydraulic cylinder (110) to drive the piston rod of the actuator hydraulic cylinder (110) to move.

2. The hydraulic lifting system according to claim 1, characterized in that: At least two oil pumping parts (141) are provided, and each of the oil pumping parts (141) is connected to each of the driving parts (142) in a one-to-one correspondence to form at least two oil pumps that operate independently of each other. The two oil pumps that operate independently of each other include a main oil supply pump and an emergency pump. One of the main oil supply pump and the emergency pump operates to pump oil to the actuator hydraulic cylinder (110).

3. The hydraulic lifting system according to claim 1, characterized in that: The control valve (130) includes a primary reversing valve (131), and the actuator hydraulic cylinder (110) includes a primary hydraulic cylinder (111); The oil pump component (141) is connected between the oil inlet of the first-stage reversing valve (131) and the oil tank (120), the oil return port of the first-stage reversing valve (131) is connected to the oil tank (120), the rodless oil chamber of the first-stage hydraulic cylinder (111) is connected to the working oil port A1 of the first-stage reversing valve (131), and the rod oil chamber of the first-stage hydraulic cylinder (111) is connected to the working oil port B1 of the first-stage reversing valve (131); The oil inlet and oil return port of the first-stage reversing valve (131) are switched and connected between the working oil port A1 and the working oil port B1, respectively, so that the oil pumping assembly (140) switches the pumping oil to the rod oil chamber and the rodless oil chamber of the first-stage hydraulic cylinder (111), respectively, to drive the piston rod of the first-stage hydraulic cylinder (111) to reciprocate and extend.

4. The hydraulic lifting system according to claim 3, characterized in that: The hydraulic lifting system further includes a relief valve (150), and the control valve (130) further includes a primary on-off valve (132); The oil inlet of the overflow valve (150) is communicated between the oil pump component (141) and the oil inlet of the primary reversing valve (131), and the oil outlet of the overflow valve (150) is communicated between the oil return port of the primary reversing valve (131) and the oil tank (120); One of the rodless oil chamber and the rod oil chamber of the first-stage hydraulic cylinder (111) is also connected between the oil outlet of the overflow valve (150) and the oil tank (120), forming an inlet and outlet oil path of the first-stage hydraulic cylinder (111); The primary on-off valve (132) is used to control the conduction or disconnection of the inlet and outlet oil circuits of the primary hydraulic cylinder (111).

5. The hydraulic lifting system according to claim 3, characterized in that: The hydraulic lifting system further comprises a hydraulically controlled one-way valve (160), wherein the hydraulically controlled one-way valve (160) is connected between the primary reversing valve (131) and the primary hydraulic cylinder (111); The two oil inlets of the hydraulically controlled one-way valve (160) are respectively connected to the working oil port A1 and the working oil port B1 of the first-stage reversing valve (131) in a one-to-one correspondence; The two oil outlets of the hydraulically controlled one-way valve (160) are respectively connected to the rod oil chamber and the rodless oil chamber of the first-stage hydraulic cylinder (111) in a one-to-one correspondence; The control oil route of the hydraulically controlled one-way valve (160) is connected to the oil inlet ports of the hydraulically controlled one-way valve (160).

6. The hydraulic lifting system according to claim 4, characterized in that: The execution hydraulic cylinder (110) further includes a secondary hydraulic cylinder (112), and the control valve (130) further includes a secondary on-off valve (133); The rodless oil chamber of the secondary hydraulic cylinder (112) is connected between the primary on-off valve (132) and the oil tank (120), forming an inlet and outlet oil path of the secondary hydraulic cylinder (112); the secondary on-off valve (133) is used to control the conduction or disconnection of the inlet and outlet oil paths of the secondary hydraulic cylinder (112).

7. The hydraulic lifting system according to claim 6, characterized in that: The hydraulic lifting system further includes a one-way speed regulating valve (170), the one-way speed regulating valve (170) acting on the inlet and outlet oil passages of the secondary hydraulic cylinder (112); The oil inlet of the one-way speed regulating valve (170) is connected between the primary on-off valve (132) and the oil tank (120), and the oil outlet of the one-way speed regulating valve (170) is connected to the rodless oil chamber of the secondary hydraulic cylinder (112); The one-way valve oil inlet of the one-way speed regulating valve (170) is connected to the rodless oil chamber of the secondary hydraulic cylinder (112), and the one-way valve oil outlet of the one-way speed regulating valve (170) is connected between the primary on-off valve (132) and the oil tank (120).

8. The hydraulic lifting system according to claim 6, characterized in that: The rodless oil chamber of the secondary hydraulic cylinder (112) is also connected to the working oil port C1 of the primary reversing valve (131), and the oil inlet of the primary reversing valve (131) is switched between the working oil port A1, the working oil port B1 and the working oil port C1, so that the oil pumping assembly (140) pumps oil to at least one of the primary hydraulic cylinder (111) and the secondary hydraulic cylinder (112) through the primary reversing valve (131).

9. The hydraulic lifting system according to claim 8, characterized in that: The oil inlet of the primary reversing valve (131) includes an oil inlet P1 and an oil inlet P1'; The oil inlet P1 is in communication with the oil pumping member (141); The oil inlet P1' is connected between the oil inlet P1 and the oil pumping member (141); The oil inlet of the overflow valve (150) is connected between the oil inlet P1' and the oil pumping member (141); The working oil port C1 of the primary reversing valve (131) is connected between the primary on-off valve (132), the secondary on-off valve (133) and the oil tank (120); Wherein, the primary reversing valve (131) is configured as follows: When the primary reversing valve (131) is in the middle position, the oil inlet P1 of the primary reversing valve (131) is connected to the working oil port C1, the oil return port, the oil inlet P1', the working oil port A1 and the working oil port B1 of the primary reversing valve (131) are respectively closed, and the oil pumping assembly (140) pumps oil to the secondary hydraulic cylinder (112); And / or, in one of the normally open positions of the primary reversing valve (131), the oil inlet P1' of the primary reversing valve (131) is connected to one of the working oil port A1 and the working oil port B1, the oil return port of the primary reversing valve (131) is connected to the other of the working oil port A1 and the working oil port B1, the oil inlet P1 and the working oil port C1 are closed, and the oil pumping assembly (140) pumps oil to the primary hydraulic cylinder (111).

10. The hydraulic lifting system according to claim 6, characterized in that: The control valve (130) further includes a three-stage on-off valve (134); The oil pumping member (141) is also connected between the secondary hydraulic cylinder (112) and the secondary on-off valve (133); The three-stage on-off valve (134) is used to control the connection or disconnection of the connecting pipeline between the oil pumping component (141) and the secondary hydraulic cylinder (112), so that the oil pumping component (140) pumps oil to the secondary hydraulic cylinder (112) through the three-stage on-off valve (134).

11. An aircraft refueling vehicle, characterized in that: It comprises a vehicle body, an upper assembly and the hydraulic lifting system according to any one of claims 1 to 10; The upper assembly includes at least one of an anchor and a refueling platform mounted on the vehicle body; The piston rod of the execution hydraulic cylinder (110) is connected to the upper assembly.

Images