Electric control hydraulic system of aerial vehicle luffing mechanism

Abstract

The invention discloses an electric control hydraulic system of an aerial vehicle luffing mechanism, and relates to the field of aerial vehicle luffing control, and the electric control hydraulic system comprises a hydraulic oil processing circulator used for storing hydraulic oil, controlling the flowing state of the hydraulic oil according to the driving state of a hydraulic pump, and cleaning the hydraulic oil; the electric control electromagnetic overflow valve is used for controlling the trend of the hydraulic oil according to the working requirement of a luffing mechanism of the high-altitude vehicle and controlling the state of the hydraulic oil cylinder based on a control result so as to realize luffing operation of the high-altitude vehicle; and the variable-amplitude falling control cutter is used for adjusting the variable-amplitude falling state by utilizing the electric control balance valve, cutting off the flowing of the hydraulic oil after the variable-amplitude falling work is finished, and closing the variable-amplitude falling operation of the high-altitude vehicle. According to the invention, gravity lowering and electric energy saving can be realized when the reversing valve is in the neutral position, the function of amplitude variation with a power source as motive power can be realized, and a secondary protection valve is added on the basis, so that the use safety of the whole vehicle is ensured, and the personal safety is protected to a greater extent.

Description

Technical Field

[0001] The invention relates to the field of boom-changing control of aerial vehicles, and in particular to an electric-controlled hydraulic system of a boom-changing mechanism of an aerial vehicle. Background Art

[0002] The boom mechanism of an aerial vehicle is an important component of its hydraulic system, which is used to control the pitch angle (i.e., rising and falling) of the working arm. The mechanism is usually composed of a hydraulic cylinder, an electronically controlled hydraulic element, and a mechanical support component. The smooth boom variation of the working arm is achieved through the coordinated work of the hydraulic transmission and the electronic control system.

[0003] The boom-changing mechanism of the aerial vehicle relies on the coordinated work of hydraulic transmission and electronic control technology. Through the cooperation of components such as hydraulic cylinders, balancing valves, reversing valves and overflow valves, it achieves stable, efficient and safe pitch control of the working arm. It is widely used in scenarios that require high-altitude operations, such as engineering construction, municipal maintenance, rescue, etc.

[0004] However, the variable amplitude mechanism in the prior art is a telescopic arm supported by a single cylinder, and the balancing valve is directly installed on the cylinder. When the mechanism is unbalanced or overloaded and the system cleanliness is insufficient, the balancing valve may be opened, the working amplitude is increased, the stability performance is reduced, and the operation risk is greater.

[0005] Currently, no effective solution has been proposed for the problems in the related technologies. Summary of the invention

[0006] In view of the problems in the related art, the present invention proposes an electronically controlled hydraulic system of a boom-changing mechanism of an aerial vehicle to overcome the above-mentioned technical problems existing in the existing related art.

[0007] To this end, the specific technical solution adopted by the present invention is as follows:

[0008] In a first aspect, the present invention provides an electronically controlled hydraulic system for a boom mechanism of an aerial vehicle, the electronically controlled hydraulic system comprising:

[0009] A hydraulic oil treatment flow device is used to store hydraulic oil, control the flow state of the hydraulic oil according to the driving state of the hydraulic pump, and clean the hydraulic oil;

[0010] The electronically controlled electromagnetic overflow valve is used to control the direction of the hydraulic oil according to the working requirements of the boom mechanism of the aerial vehicle, and to control the state of the hydraulic cylinder based on the control result to realize the boom lowering operation of the aerial vehicle;

[0011] The luffing control cut-off device is used to adjust the state of the luffing by means of the electronically controlled balancing valve, and to cut off the flow of hydraulic oil after the luffing work is completed, thereby shutting down the luffing operation of the aerial vehicle.

[0012] Preferably, the hydraulic oil treatment flow device comprises:

[0013] The hydraulic oil tank is used to store hydraulic oil by utilizing the capacity and internal structure of the oil tank and to provide hydraulic oil during the boom operation of the aerial vehicle;

[0014] The stop valve is used to adaptively cut off the flow of hydraulic oil according to the boom height change requirements of the aerial vehicle;

[0015] Hydraulic pump, used to convert mechanical energy into hydraulic energy and drive the hydraulic oil to flow in the boom mechanism of the aerial vehicle;

[0016] The filter is used to filter impurities and pollutants in the hydraulic oil after the hydraulic pump is started to maintain the cleanliness of the hydraulic oil.

[0017] Preferably, the electronically controlled electromagnetic overflow valve comprises:

[0018] The electromagnetic overflow valve is used to monitor the pressure of the boom mechanism of the aerial vehicle and compare the monitoring result with the preset value. According to the comparison result, the stop valve is closed to allow the hydraulic oil to flow to the hydraulic oil tank;

[0019] The hydraulic oil reversing valve is used to change the position of the hydraulic oil reversing valve according to the control signal, and control the flow direction of the hydraulic oil and the state of the hydraulic cylinder based on the change result to realize the variable amplitude lowering operation of the aerial vehicle.

[0020] Preferably, changing the position of the hydraulic oil reversing valve according to the control signal, and controlling the flow direction of the hydraulic oil to control the state of the hydraulic cylinder based on the change result, so as to realize the variable amplitude drop operation of the aerial vehicle includes:

[0021] According to the luffing control signal of the aerial vehicle luffing mechanism, the hydraulic oil reversing valve is driven to flow vertically to realize the switching of the hydraulic oil flow position;

[0022] After the switching is completed, the hydraulic oil flows from the oil port of the hydraulic oil reversing valve to the connecting port of the electric control balance valve, and the electric control balance valve receives the hydraulic oil and energizes the electromagnet to form a circuit;

[0023] Under the action of the electromagnet, the flow direction of the hydraulic oil is controlled, and the hydraulic oil is introduced into the inside of the oil port of the rod chamber of the hydraulic cylinder, pushing the piston rod to retract, thereby realizing the variable amplitude lowering operation of the aerial vehicle.

[0024] Preferably, the state of the luffing is adjusted by using an electronically controlled balancing valve, and the flow of hydraulic oil is cut off after the luffing is completed. Closing the luffing operation of the aerial vehicle includes:

[0025] The rod chamber pressure detection port is used to monitor the pressure information at the rod chamber oil port position of the hydraulic cylinder, and the stability of the variable amplitude drop operation is judged based on the pressure result;

[0026] According to the judgment result, the electronically controlled balancing valve is driven, and the pressure at the oil port of the rod chamber of the hydraulic cylinder is adjusted by the electronically controlled balancing valve to adjust the state of the luffing and lowering to maintain the stability of the luffing and lowering operation;

[0027] The stop control signal is received according to the boom length change requirement of the aerial vehicle, the electromagnet is powered off based on the stop signal, the hydraulic oil reversing valve is reset, the flow of the hydraulic oil is cut off, and the boom length change and lowering operation of the aerial vehicle is closed.

[0028] In a second aspect, the present invention further provides an electronically controlled hydraulic system for a boom mechanism of an aerial vehicle, the electronically controlled hydraulic system comprising:

[0029] The luffing hydraulic oil treatment circulator is used to store the hydraulic oil, control the flow state of the hydraulic oil according to the driving state of the hydraulic pump, and clean the hydraulic oil;

[0030] The luffing lifting electronically controlled electromagnetic overflow valve is used to control the direction of the hydraulic oil according to the working requirements of the aerial vehicle luffing mechanism, and control the state of the hydraulic cylinder based on the control result to realize the luffing lifting operation of the aerial vehicle;

[0031] The luffing crane control cut-off device is used to adjust the state of the luffing crane by means of the electronically controlled balancing valve, and to cut off the flow of hydraulic oil after the luffing crane work is completed, thereby shutting down the luffing crane operation of the aerial vehicle.

[0032] Preferably, the luffing hydraulic oil treatment circulator comprises:

[0033] The hydraulic oil tank is used to store hydraulic oil by utilizing the capacity and internal structure of the oil tank and to provide hydraulic oil during the boom operation of the aerial vehicle;

[0034] The stop valve is used to adaptively cut off the flow of hydraulic oil according to the boom height change requirements of the aerial vehicle;

[0035] Hydraulic pump, used to convert mechanical energy into hydraulic energy and drive the hydraulic oil to flow in the boom mechanism of the aerial vehicle;

[0036] The filter is used to filter impurities and pollutants in the hydraulic oil after the hydraulic pump is started to maintain the cleanliness of the hydraulic oil.

[0037] Preferably, the variable amplitude electrically controlled electromagnetic relief valve comprises:

[0038] The electromagnetic overflow valve is used to monitor the pressure of the boom mechanism of the aerial vehicle and compare the monitoring result with the preset value. According to the comparison result, the stop valve is closed to allow the hydraulic oil to flow to the hydraulic oil tank;

[0039] The hydraulic oil reversing valve is used to change the position of the hydraulic oil reversing valve according to the control signal, and control the flow direction of the hydraulic oil and the state of the hydraulic cylinder based on the change result to realize the variable lifting operation of the aerial vehicle.

[0040] Preferably, changing the position of the hydraulic oil reversing valve according to the control signal, and controlling the flow direction of the hydraulic oil to control the state of the hydraulic cylinder based on the change result, so as to realize the variable-length lifting operation of the aerial vehicle includes:

[0041] According to the boom control signal of the boom mechanism of the aerial vehicle, the electromagnet at the position of the hydraulic oil reversing valve is stimulated to be energized, and the position of the hydraulic oil reversing valve is switched based on the energization result to realize the cross-connection of the oil port;

[0042] After the switching is completed, the hydraulic oil flows to the connection port of the electric control balance valve through the oil port of the hydraulic oil reversing valve, and the electric control balance valve receives the hydraulic oil and energizes the electromagnet of the electric control balance valve to form a circuit;

[0043] The hydraulic oil is introduced into the oil port of the rodless chamber of the hydraulic cylinder through the electronically controlled balancing valve, driving the extension of the hydraulic cylinder to realize the variable-length lifting operation of the aerial vehicle;

[0044] During the luffing operation, the hydraulic oil in the rodless chamber oil port of the hydraulic cylinder enters the interior of the hydraulic oil reversing valve through the auxiliary chamber of the electronically controlled balancing valve and flows to the hydraulic oil tank.

[0045] Preferably, the state of the luffing crane is adjusted by using an electronically controlled balancing valve, and the flow of hydraulic oil is cut off after the luffing crane is completed. Shutting down the luffing crane operation of the aerial vehicle includes:

[0046] The rodless cavity pressure detection port is used to monitor the pressure information at the rodless cavity oil port position of the hydraulic cylinder, and the stability of the variable-luffing operation is judged based on the pressure result;

[0047] According to the judgment result, the electronically controlled balancing valve is driven, and the pressure at the oil port position of the rodless chamber of the hydraulic cylinder is adjusted by the electronically controlled balancing valve to adjust the state of the luffing machine and maintain the stability of the luffing machine operation;

[0048] The stop control signal is received according to the boom length adjustment requirement of the aerial vehicle, the electromagnet is powered off based on the stop signal, the hydraulic oil reversing valve is reset, the flow of the hydraulic oil is cut off, and the boom length adjustment operation of the aerial vehicle is closed.

[0049] The beneficial effects of the present invention are:

[0050] 1. The electronically controlled hydraulic system proposed in the present invention realizes the purpose of flexible switching during the use of the luffing mechanism of the prime mover and the electric power system, and includes multiple emergency valves and double protection for luffing, which increases double protection and flexible use, not only reducing the types of products, but also achieving large-scale production of the same model to reduce costs and improve product competitiveness, and improving the safety performance of product use.

[0051] 2. The present invention can realize the gravity decentralization and electric energy saving when the reversing valve is in the middle position, and can also be applied to the function of amplitude variation when the power source is the original power. A secondary protection valve is added on this basis to ensure the safety of the whole vehicle, thereby protecting personal safety to a greater extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0053] Figure 1 is a principle block diagram according to the first embodiment of the present invention;

[0054] Figure 2 is a schematic diagram of the working principle of the first embodiment of the present invention;

[0055] Figure 3 is a principle block diagram according to Embodiment 2 of the present invention;

[0056] Figure 4 is a schematic diagram of the working principle of the second embodiment of the present invention;

[0057] Figure 5 It is a working principle diagram of variable amplitude drop in the prior art;

[0058] Figure 6 It is a working principle diagram of a variable amplitude machine in the prior art.

[0059] In the figure:

[0060] 101. Hydraulic oil treatment circulator; 102. Electric-controlled electromagnetic overflow valve; 103. Luffing drop control cut-off device; 201. Hydraulic oil treatment circulator for luffing start; 202. Electric-controlled electromagnetic overflow valve for luffing start; 203. Luffing start control cut-off device; 1. Hydraulic oil tank; 2. Stop valve; 3. Hydraulic pump; 4. Filter; 5. Electromagnetic overflow valve; 6. Hydraulic oil reversing valve; 7. Electric-controlled balance valve; 8. Hydraulic cylinder. DETAILED DESCRIPTION

[0061] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, ordinary technicians in the field should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0062] According to an embodiment of the present invention, an electronically controlled hydraulic system of a boom mechanism of an aerial vehicle is provided.

[0063] Embodiment 1

[0064] like Figure 1 As shown, according to the electronically controlled hydraulic system of the boom mechanism of the aerial vehicle according to an embodiment of the present invention, the electronically controlled hydraulic system comprises:

[0065] The hydraulic oil treatment flow device 101 is used to store the hydraulic oil, control the flow state of the hydraulic oil according to the driving state of the hydraulic pump, and clean the hydraulic oil;

[0066] The electronically controlled electromagnetic overflow valve 102 is used to control the direction of the hydraulic oil according to the working requirements of the boom mechanism of the aerial vehicle, and to control the state of the hydraulic cylinder based on the control result to realize the boom lowering operation of the aerial vehicle;

[0067] The luffing control cut-off device 103 is used to adjust the state of the luffing by using the electronically controlled balancing valve, and to cut off the flow of hydraulic oil after the luffing work is completed, thereby closing the luffing operation of the aerial vehicle.

[0068] In this embodiment, the hydraulic oil processing flow device 101 includes:

[0069] The hydraulic oil tank is used to store hydraulic oil by utilizing the capacity and internal structure of the oil tank and to provide hydraulic oil during the boom operation of the aerial vehicle;

[0070] The stop valve is used to adaptively cut off the flow of hydraulic oil according to the boom height change requirements of the aerial vehicle;

[0071] Hydraulic pump, used to convert mechanical energy into hydraulic energy and drive the hydraulic oil to flow in the boom mechanism of the aerial vehicle;

[0072] The filter is used to filter impurities and pollutants in the hydraulic oil after the hydraulic pump is started to maintain the cleanliness of the hydraulic oil.

[0073] In this embodiment, the electronically controlled electromagnetic relief valve 102 includes:

[0074] The electromagnetic overflow valve is used to monitor the pressure of the boom mechanism of the aerial vehicle and compare the monitoring result with the preset value. According to the comparison result, the stop valve is closed to allow the hydraulic oil to flow to the hydraulic oil tank;

[0075] The hydraulic oil reversing valve is used to change the position of the hydraulic oil reversing valve according to the control signal, and control the flow direction of the hydraulic oil and the state of the hydraulic cylinder based on the change result to realize the variable amplitude lowering operation of the aerial vehicle.

[0076] In this embodiment, the position of the hydraulic oil reversing valve is changed according to the control signal, and the flow direction of the hydraulic oil is controlled based on the change result to control the state of the hydraulic cylinder, so as to realize the variable-luffing operation of the aerial vehicle, including:

[0077] According to the luffing control signal of the aerial vehicle luffing mechanism, the hydraulic oil reversing valve is driven to flow vertically to realize the switching of the hydraulic oil flow position;

[0078] After the switching is completed, the hydraulic oil flows from the oil port of the hydraulic oil reversing valve to the connecting port of the electric control balance valve, and the electric control balance valve receives the hydraulic oil and energizes the electromagnet to form a circuit;

[0079] Under the action of the electromagnet, the flow direction of the hydraulic oil is controlled, and the hydraulic oil is introduced into the inside of the oil port of the rod chamber of the hydraulic cylinder, pushing the piston rod to retract, thereby realizing the variable amplitude lowering operation of the aerial vehicle.

[0080] In this embodiment, the state of the luffing is adjusted by using an electronically controlled balancing valve, and the flow of hydraulic oil is cut off after the luffing is completed. Closing the luffing operation of the aerial vehicle includes:

[0081] The rod chamber pressure detection port is used to monitor the pressure information at the rod chamber oil port position of the hydraulic cylinder, and the stability of the variable amplitude drop operation is judged based on the pressure result;

[0082] According to the judgment result, the electronically controlled balancing valve is driven, and the pressure at the oil port of the rod chamber of the hydraulic cylinder is adjusted by the electronically controlled balancing valve to adjust the state of the luffing and lowering to maintain the stability of the luffing and lowering operation;

[0083] The stop control signal is received according to the boom length change requirement of the aerial vehicle, the electromagnet is powered off based on the stop signal, the hydraulic oil reversing valve is reset, the flow of the hydraulic oil is cut off, and the boom length change and lowering operation of the aerial vehicle is closed.

[0084] In order to facilitate understanding of the above technical solution of the present embodiment, the variable amplitude drop operation method of the present embodiment in the actual process is described in detail below.

[0085] like Figure 2 As shown, the hydraulic oil is supplied through the hydraulic box 1, and the hydraulic pump 3 is driven by the motor M to generate pressure oil, and enters the system after being filtered by the filter 4. When the "variable amplitude drop" operation is performed, the coordinated control of the hydraulic system components is realized through the electric control signal. The operator sends an electric control signal of "variable amplitude drop", and the electromagnet EY1 of the hydraulic oil reversing valve 6 is energized, and the valve core is switched to the working position of "P port connects to A port, B port connects to T port". At the same time, the solenoid valve SV2 in the electric control balance valve 7 is energized, and the side controlled by the preload spring of the balance valve is opened, allowing the return oil of the hydraulic cylinder 8 to flow, and the pressure oil output by the hydraulic pump 3 flows from the P port to the A port through the hydraulic oil reversing valve 6 and enters the rodless chamber of the hydraulic cylinder 8.

[0086] The oil in the rod chamber C2 of the hydraulic cylinder 8 passes through the B port of the electronically controlled balancing valve 7 and the hydraulic oil reversing valve 6, and finally returns to the hydraulic oil tank 1 through the T port. The function of the electronically controlled balancing valve 7 is to maintain the stable descent of the load to prevent the hydraulic cylinder 8 from rapidly falling out of control due to the deadweight of the load. After the electronic control signal opens the control path of the balancing valve, the return oil is allowed to flow, but a certain damping effect is still maintained. During the descent process, the electromagnetic relief valve 5 is responsible for limiting the system pressure to ensure that the working pressure does not exceed the set value. When the pressure exceeds the set value of the relief valve, the excess oil returns directly to the hydraulic oil tank 1 through the electromagnetic relief valve 5, and the hydraulic oil enters the hydraulic pump 3 through the filter 4, and finally returns to the hydraulic oil tank 1 after passing through the system to complete the cycle. The function of the filter 4 is to filter impurities in the oil to ensure the cleanliness and long-term reliable operation of the hydraulic system (in the figure, M1 represents the rodless chamber pressure detection port; M2 represents the rod chamber pressure detection port; C1 represents the rodless chamber oil port; C2 represents the rod chamber oil port).

[0087] Embodiment 2

[0088] like Figure 3 As shown, according to another embodiment of the present invention, there is also provided an electronically controlled hydraulic system for a boom mechanism of an aerial vehicle, the electronically controlled hydraulic system comprising:

[0089] The luffing hydraulic oil treatment flow device 201 is used to store the hydraulic oil, control the flow state of the hydraulic oil according to the driving state of the hydraulic pump, and clean the hydraulic oil;

[0090] The luffing-starting electrically controlled electromagnetic overflow valve 202 is used to control the direction of the hydraulic oil according to the working requirements of the aerial vehicle luffing mechanism, and to control the state of the hydraulic cylinder based on the control result to realize the luffing-starting operation of the aerial vehicle;

[0091] The luffing crane control cut-off device 203 is used to adjust the state of the luffing crane by using the electronically controlled balancing valve, and to cut off the flow of hydraulic oil after the luffing crane is completed, thereby shutting down the luffing crane operation of the aerial vehicle.

[0092] In this embodiment, the luffing hydraulic oil processing circulator 201 includes:

[0093] The hydraulic oil tank is used to store hydraulic oil by utilizing the capacity and internal structure of the oil tank and to provide hydraulic oil during the boom operation of the aerial vehicle;

[0094] The stop valve is used to adaptively cut off the flow of hydraulic oil according to the boom height change requirements of the aerial vehicle;

[0095] Hydraulic pump, used to convert mechanical energy into hydraulic energy and drive the hydraulic oil to flow in the boom mechanism of the aerial vehicle;

[0096] The filter is used to filter impurities and pollutants in the hydraulic oil after the hydraulic pump is started to maintain the cleanliness of the hydraulic oil.

[0097] In this embodiment, the variable amplitude electric controlled electromagnetic overflow valve 202 includes:

[0098] The electromagnetic overflow valve is used to monitor the pressure of the boom mechanism of the aerial vehicle and compare the monitoring result with the preset value. According to the comparison result, the stop valve is closed to allow the hydraulic oil to flow to the hydraulic oil tank;

[0099] The hydraulic oil reversing valve is used to change the position of the hydraulic oil reversing valve according to the control signal, and control the flow direction of the hydraulic oil and the state of the hydraulic cylinder based on the change result to realize the variable lifting operation of the aerial vehicle.

[0100] In this embodiment, the position of the hydraulic oil reversing valve is changed according to the control signal, and the flow direction of the hydraulic oil is controlled based on the change result to control the state of the hydraulic cylinder, so as to realize the variable-bending operation of the aerial vehicle, including:

[0101] According to the boom control signal of the boom mechanism of the aerial vehicle, the electromagnet at the position of the hydraulic oil reversing valve is stimulated to be energized, and the position of the hydraulic oil reversing valve is switched based on the energization result to realize the cross-connection of the oil port;

[0102] After the switching is completed, the hydraulic oil flows to the connection port of the electric control balance valve through the oil port of the hydraulic oil reversing valve, and the electric control balance valve receives the hydraulic oil and energizes the electromagnet of the electric control balance valve to form a circuit;

[0103] The hydraulic oil is introduced into the oil port of the rodless chamber of the hydraulic cylinder through the electronically controlled balancing valve, driving the extension of the hydraulic cylinder to realize the variable-length lifting operation of the aerial vehicle;

[0104] During the luffing operation, the hydraulic oil in the rodless chamber oil port of the hydraulic cylinder enters the hydraulic oil reversing valve through the auxiliary chamber of the electronically controlled balancing valve and flows to the hydraulic oil tank.

[0105] In this embodiment, the state of the luffing crane is adjusted by using an electronically controlled balancing valve, and the flow of hydraulic oil is cut off after the luffing crane is completed. The operation of shutting down the luffing crane of the aerial vehicle includes:

[0106] The rodless cavity pressure detection port is used to monitor the pressure information at the rodless cavity oil port position of the hydraulic cylinder, and the stability of the variable-luffing operation is judged based on the pressure result;

[0107] According to the judgment result, the electronically controlled balancing valve is driven, and the pressure at the oil port position of the rodless chamber of the hydraulic cylinder is adjusted by the electronically controlled balancing valve to adjust the state of the luffing machine and maintain the stability of the luffing machine operation;

[0108] The stop control signal is received according to the boom length adjustment requirement of the aerial vehicle, the electromagnet is powered off based on the stop signal, the hydraulic oil reversing valve is reset, the flow of the hydraulic oil is cut off, and the boom length adjustment operation of the aerial vehicle is closed.

[0109] In order to facilitate understanding of the above technical solution of the present embodiment, the operation mode of the variable amplitude starter in the actual process of the present embodiment is described in detail below.

[0110] like Figure 4 As shown, the motor M starts to drive the hydraulic pump 3 to operate. The hydraulic pump 3 draws hydraulic oil from the hydraulic oil tank 1, filters it through the filter 4, and then outputs it to the hydraulic system. At the same time, it ensures that the stop valve 2 is in the open state to allow the hydraulic oil to enter the main oil circuit. The operator issues a "variable amplitude start" command through the controller. This command excites the electromagnet EY1 of the electromagnetic hydraulic oil reversing valve 6 through an electrical signal. After the electromagnet EY1 is energized, the hydraulic oil reversing valve 6 switches to the left position, so that the P port is connected to the A port, and the B port is connected to the T port. The high-pressure oil output by the hydraulic pump 3 flows to the electronically controlled balancing valve 7 through the reversing valve P→A port. In the electronically controlled balancing valve 7, the hydraulic oil passes through the V1 passage of the electronically controlled balancing valve 7 and enters the rodless chamber C4 of the hydraulic cylinder 8. When the hydraulic cylinder 8 extends, the oil in the C2 chamber enters the B port of the hydraulic oil reversing valve 6 through the V2 passage of the electronically controlled balancing valve 7, and then returns to the hydraulic oil tank 1 through the T port.

[0111] During the luffing action, the V2 passage of the electronically controlled balancing valve 7 limits the return oil to prevent the hydraulic cylinder 8 from sliding down uncontrollably due to gravity. The V1 passage controls the oil flow entering the rodless chamber to ensure that the hydraulic cylinder extends smoothly. During the operation of the hydraulic system, if the hydraulic oil rises abnormally due to excessive external load or abnormal system pressure, the electromagnetic relief valve 5 will open, and part of the high-pressure oil will return to the oil tank through the T port to ensure that the system pressure is always within a safe range. At the same time, the pressure relay PV1 monitors the system pressure in real time. If the pressure exceeds the set range, the relay sends a signal to cut off the power supply of the electromagnet EY1, stop the extension of the hydraulic cylinder, and release the pressure through the relief valve to ensure safety. When the hydraulic cylinder is extended to the target position of the luffing, the operator releases the control switch, the electromagnet EY1 is powered off, the hydraulic oil reversing valve 6 returns to the middle position, cuts off the oil circuit, and the hydraulic cylinder remains in the current position. The entire luffing action is completed (in the figure, M1 represents the rodless chamber pressure detection port; M2 represents the rod chamber pressure detection port; C1 represents the rodless chamber oil port; C2 represents the rod chamber oil port).

[0112] What needs to be explained is that the principle of variable-length emergency landing is to press the emergency landing button on the lower control box panel on the vehicle alone, and the proportional solenoid PV1 and the solenoid SV2 of the electric control balancing valve 7 are energized at the same time, and the hydraulic oil in the rodless chamber of the hydraulic cylinder 8 returns to the hydraulic oil tank 1 through the proportional valve and the switch valve. The fastest speed is adjusted by the throttle port of the electric control balancing valve 7, and the speed range is based on the opening degree of the proportional valve.

[0113] In summary, with the help of the above technical solutions of the present invention, the electronically controlled hydraulic system proposed by the present invention realizes the purpose of flexible switching during the use of the variable amplitude mechanism of the prime mover and the electric power system, and includes multiple emergency valves and variable amplitude dual protection, which increases double protection and flexible use, not only reducing the types of products, but also achieving large-scale production of the same model to reduce costs and improve product competitiveness, and improving the safety performance of product use. The present invention can realize the gravity decentralization and energy saving when the reversing valve is in the middle position, and can also be applied to the function of variable amplitude when the power source is the prime mover. On this basis, a secondary protection valve is added to ensure the safety of the entire vehicle, thereby protecting personal safety to a greater extent.

[0114] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electronically controlled hydraulic system for a boom mechanism of an aerial vehicle, characterized in that: The electronically controlled hydraulic system includes: A hydraulic oil treatment flow device is used to store hydraulic oil, control the flow state of the hydraulic oil according to the driving state of the hydraulic pump, and clean the hydraulic oil; The electronically controlled electromagnetic overflow valve is used to control the direction of the hydraulic oil according to the working requirements of the boom mechanism of the aerial vehicle, and to control the state of the hydraulic cylinder based on the control result to realize the boom lowering operation of the aerial vehicle; The luffing control cut-off device is used to adjust the state of the luffing by means of the electronically controlled balancing valve, and to cut off the flow of hydraulic oil after the luffing work is completed, thereby shutting down the luffing operation of the aerial vehicle.

2. The electronically controlled hydraulic system of the boom mechanism of an aerial vehicle according to claim 1, characterized in that: The hydraulic oil treatment flow device comprises: The hydraulic oil tank is used to store hydraulic oil by utilizing the capacity and internal structure of the oil tank and to provide hydraulic oil during the boom operation of the aerial vehicle; The stop valve is used to adaptively cut off the flow of hydraulic oil according to the boom height change requirements of the aerial vehicle; Hydraulic pump, used to convert mechanical energy into hydraulic energy and drive the hydraulic oil to flow in the boom mechanism of the aerial vehicle; The filter is used to filter impurities and pollutants in the hydraulic oil after the hydraulic pump is started to maintain the cleanliness of the hydraulic oil.

3. The electronically controlled hydraulic system of the boom mechanism of an aerial vehicle according to claim 2, characterized in that: The electronically controlled electromagnetic relief valve comprises: The electromagnetic overflow valve is used to monitor the pressure of the boom mechanism of the aerial vehicle and compare the monitoring result with the preset value. According to the comparison result, the stop valve is closed to allow the hydraulic oil to flow to the hydraulic oil tank; The hydraulic oil reversing valve is used to change the position of the hydraulic oil reversing valve according to the control signal, and control the flow direction of the hydraulic oil and the state of the hydraulic cylinder based on the change result to realize the variable amplitude lowering operation of the aerial vehicle.

4. The electronically controlled hydraulic system of the boom mechanism of an aerial vehicle according to claim 3, characterized in that: The method of changing the position of the hydraulic oil reversing valve according to the control signal, and controlling the flow direction of the hydraulic oil and the state of the hydraulic cylinder based on the change result to realize the variable amplitude drop operation of the aerial vehicle includes: According to the luffing control signal of the aerial vehicle luffing mechanism, the hydraulic oil reversing valve is driven to flow vertically to realize the switching of the hydraulic oil flow position; After the switching is completed, the hydraulic oil flows from the oil port of the hydraulic oil reversing valve to the connecting port of the electric control balance valve, and the electric control balance valve receives the hydraulic oil and energizes the electromagnet to form a circuit; Under the action of the electromagnet, the flow direction of the hydraulic oil is controlled, and the hydraulic oil is introduced into the inside of the oil port of the rod chamber of the hydraulic cylinder, pushing the piston rod to retract, thereby realizing the variable amplitude lowering operation of the aerial vehicle.

5. The electronically controlled hydraulic system of the boom mechanism of an aerial vehicle according to claim 4, characterized in that: The electronically controlled balancing valve is used to adjust the state of the luffing and lowering, and the flow of hydraulic oil is cut off after the luffing and lowering work is completed, and the luffing and lowering operation of the aerial vehicle is closed, including: The rod chamber pressure detection port is used to monitor the pressure information at the rod chamber oil port position of the hydraulic cylinder, and the stability of the variable amplitude drop operation is judged based on the pressure result; According to the judgment result, the electronically controlled balancing valve is driven, and the pressure at the oil port of the rod chamber of the hydraulic cylinder is adjusted by the electronically controlled balancing valve to adjust the state of the luffing and lowering to maintain the stability of the luffing and lowering operation; The stop control signal is received according to the boom length change requirement of the aerial vehicle, the electromagnet is powered off based on the stop signal, the hydraulic oil reversing valve is reset, the flow of the hydraulic oil is cut off, and the boom length change and lowering operation of the aerial vehicle is closed.

6. An electronically controlled hydraulic system for a boom mechanism of an aerial vehicle, characterized in that: The electronically controlled hydraulic system comprises: The luffing hydraulic oil treatment circulator is used to store the hydraulic oil, control the flow state of the hydraulic oil according to the driving state of the hydraulic pump, and clean the hydraulic oil; The luffing lifting electronically controlled electromagnetic overflow valve is used to control the direction of the hydraulic oil according to the working requirements of the aerial vehicle luffing mechanism, and control the state of the hydraulic cylinder based on the control result to realize the luffing lifting operation of the aerial vehicle; The luffing crane control cut-off device is used to adjust the state of the luffing crane by means of the electronically controlled balancing valve, and to cut off the flow of hydraulic oil after the luffing crane work is completed, thereby shutting down the luffing crane operation of the aerial vehicle.

7. The electronically controlled hydraulic system of the boom mechanism of an aerial vehicle according to claim 6, characterized in that: The luffing hydraulic oil treatment circulation device comprises: The hydraulic oil tank is used to store hydraulic oil by utilizing the capacity and internal structure of the oil tank and to provide hydraulic oil during the boom operation of the aerial vehicle; The stop valve is used to adaptively cut off the flow of hydraulic oil according to the boom height change requirements of the aerial vehicle; Hydraulic pump, used to convert mechanical energy into hydraulic energy and drive the hydraulic oil to flow in the boom mechanism of the aerial vehicle; The filter is used to filter impurities and pollutants in the hydraulic oil after the hydraulic pump is started to maintain the cleanliness of the hydraulic oil.

8. The electronically controlled hydraulic system of the boom mechanism of an aerial vehicle according to claim 7, characterized in that: The variable amplitude electric controlled electromagnetic overflow valve comprises: The electromagnetic overflow valve is used to monitor the pressure of the boom mechanism of the aerial vehicle and compare the monitoring result with the preset value. According to the comparison result, the stop valve is closed to allow the hydraulic oil to flow to the hydraulic oil tank; The hydraulic oil reversing valve is used to change the position of the hydraulic oil reversing valve according to the control signal, and control the flow direction of the hydraulic oil and the state of the hydraulic cylinder based on the change result to realize the variable lifting operation of the aerial vehicle.

9. The electronically controlled hydraulic system of the boom mechanism of an aerial vehicle according to claim 8, characterized in that: The method of changing the position of the hydraulic oil reversing valve according to the control signal, and controlling the flow direction of the hydraulic oil and the state of the hydraulic cylinder based on the change result to realize the variable-bending operation of the aerial vehicle includes: According to the boom control signal of the boom mechanism of the aerial vehicle, the electromagnet at the position of the hydraulic oil reversing valve is stimulated to be energized, and the position of the hydraulic oil reversing valve is switched based on the energization result to realize the cross-connection of the oil port; After the switching is completed, the hydraulic oil flows to the connection port of the electric control balance valve through the oil port of the hydraulic oil reversing valve, and the electric control balance valve receives the hydraulic oil and energizes the electromagnet of the electric control balance valve to form a circuit; The hydraulic oil is introduced into the oil port of the rodless chamber of the hydraulic cylinder through the electronically controlled balancing valve, driving the extension of the hydraulic cylinder to realize the variable-length lifting operation of the aerial vehicle; During the luffing operation, the hydraulic oil in the rodless chamber oil port of the hydraulic cylinder enters the hydraulic oil reversing valve through the auxiliary chamber of the electronically controlled balancing valve and flows to the hydraulic oil tank.

10. The electronically controlled hydraulic system of the boom mechanism of an aerial vehicle according to claim 9, characterized in that: The electronically controlled balancing valve is used to adjust the state of the luffing crane, and the flow of hydraulic oil is cut off after the luffing crane is completed. The operation of closing the luffing crane of the aerial vehicle includes: The rodless cavity pressure detection port is used to monitor the pressure information at the rodless cavity oil port position of the hydraulic cylinder, and the stability of the variable-luffing operation is judged based on the pressure result; According to the judgment result, the electronically controlled balancing valve is driven, and the pressure at the oil port position of the rodless chamber of the hydraulic cylinder is adjusted by the electronically controlled balancing valve to adjust the state of the luffing machine and maintain the stability of the luffing machine operation; The stop control signal is received according to the boom length adjustment requirement of the aerial vehicle, the electromagnet is powered off based on the stop signal, the hydraulic oil reversing valve is reset, the flow of the hydraulic oil is cut off, and the boom length adjustment operation of the aerial vehicle is closed.

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