阅读说明：本技术 负载敏感液压系统以及除冰车 (Load-sensitive hydraulic system and deicing vehicle ) 是由 卿丽纯 郭方云 许乐平 肖久焜 李红术 方怡红 胡千川 陈奕松 石云 于 2021-06-30 设计创作，主要内容包括：本申请实施例公开了一种负载敏感液压系统以及除冰车,包括：第一主泵、油箱、第一油路、第一液控阀、第一执行元件、第二油路以及反馈单元；第一液控阀包括第一状态以及第二状态,第一执行元件运转,第一液控阀处于第一状态,第一油路中的液压油经过第一液控阀减压至第二预设压力并从第三端口中流出；第一执行元件停止运转,第一液控阀处于第二状态,第一液控阀的第一端口与第二端口能够连通以实现溢流,第三端口中的液压油保持在第二预设压力；反馈单元能够获取第二油路中的负载,并反馈到第一主泵。本申请实施例的负载敏感液压系统以及除冰车,既能憋压也能改善发热。(The embodiment of the application discloses sensitive hydraulic system of load and deicing vehicle includes: the hydraulic control system comprises a first main pump, an oil tank, a first oil way, a first hydraulic control valve, a first execution element, a second oil way and a feedback unit; the first hydraulic control valve comprises a first state and a second state, the first execution element operates, the first hydraulic control valve is in the first state, and hydraulic oil in the first oil way is decompressed to a second preset pressure through the first hydraulic control valve and flows out of the third port; the first execution element stops running, the first hydraulic control valve is in a second state, the first port and the second port of the first hydraulic control valve can be communicated to realize overflow, and hydraulic oil in the third port is kept at a second preset pressure; the feedback unit can acquire the load in the second oil passage and feed back to the first main pump. The load-sensitive hydraulic system and the deicing vehicle of the embodiment of the application can not only suppress pressure but also improve heating.)

1. A load sensitive hydraulic system, comprising: the hydraulic control system comprises a first main pump (100), an oil tank (110), a first oil path (120), a first hydraulic control valve (130), a first execution element (160), a second oil path (170) and a feedback unit (180);

the first main pump (100) is capable of supplying hydraulic oil having a first preset pressure to the first oil passage (120);

the first pilot-controlled valve (130) includes a first port (131), a second port (132), and a third port (133), the first port (131) communicates with the first oil passage (120), the second port (132) communicates with the oil tank (110), the third port (133) is connected to the second oil passage (170), and the second oil passage (170) communicates with the first actuator (160);

the first pilot operated valve (130) comprises a first state and a second state;

the first execution element (160) is operated, the first hydraulic control valve (130) is in a first state, and hydraulic oil in the first oil path (120) is decompressed to a second preset pressure through the first hydraulic control valve (130) and flows out of the third port (133);

the first execution element (160) stops running, the first hydraulic control valve (130) is in a second state, the first port (131) and the second port (132) of the first hydraulic control valve (130) can be communicated to achieve overflow, and hydraulic oil in the third port (133) is kept at a second preset pressure;

the feedback unit (180) can take the load in the second oil passage (170) and feed back to the first main pump (100).

2. The load-sensitive hydraulic system according to claim 1, wherein the feedback unit (180) comprises a first feedback oil path (181), and the first main pump (100) comprises an oil suction port (101) for sucking oil from the oil tank (110), an oil supply port (102) for supplying oil to a load, and a load-sensitive port (103) for feeding back a load pressure to adjust a displacement;

the first oil passage (120) is connected to the oil supply port (102);

the first feedback oil passage (181) communicates with the second oil passage (170) to acquire a load pressure in the second oil passage (170).

3. The load sensitive hydraulic system of claim 1, comprising a second hydraulic control valve (140), a first throttle (150), and a third oil passage (190);

the third oil passage (190) is communicated with the second oil passage (170), and the first throttle valve (150) is arranged on the third oil passage (190);

the second hydraulic valve (140) is capable of selectively communicating the third port (133) with the third oil passage (190).

4. A load sensitive hydraulic system according to claim 3, characterized in that the load sensitive hydraulic system comprises a second throttle valve (200) and a fourth oil channel (210);

the fourth oil passage (210) is communicated with the second oil passage (170), and the second throttle valve (200) is arranged on the fourth oil passage (210);

the second hydraulic valve (140) is capable of selectively communicating the third port (133) with the third oil passage (190) or the fourth oil passage (210).

5. The load-sensitive hydraulic system according to claim 4, wherein the second hydraulic valve (140) includes a fourth port (141), a fifth port (142), and a sixth port (143), the third port (133) being in communication with the fourth port (141), the fifth port (142) being in communication with the third oil passage (190), the sixth port (143) being in communication with the fourth oil passage (210);

the second hydraulic control valve (140) is provided with a left working position, a middle working position and a right working position;

the second hydraulic valve (140) is in a left working position, and the fourth port (141) is communicated with the sixth port (143);

-said second hydraulic valve (140) is in an intermediate work position, said fourth port (141) being disconnected from both said fifth port (142) and said sixth port (143);

the second hydraulic valve (140) is in a right working position, and the fourth port (141) is communicated with the fifth port (142).

6. A load sensitive hydraulic system according to any one of claims 1 to 3, wherein the first pilot operated valve (130) is a direct acting relief valve.

7. The load sensitive hydraulic system of claim 2, comprising a second actuator (220), a fifth oil passage (240), and a third pilot operated valve (250);

the feedback unit (180) comprises a second feedback oil path (182), a first comparison valve (183) and a third feedback oil path (184);

the fifth oil passage (240) is communicated with the second actuator (220); the third pilot operated valve (250) is capable of selectively communicating the first oil passage (120) with the fifth oil passage (240); the second feedback oil passage (182) communicates with the fifth oil passage (240) to acquire a load pressure in the fifth oil passage (240);

the first feedback oil path (181) and the second feedback oil path (182) are respectively connected to input ends on both sides of the first comparison valve (183), the third feedback oil path (184) is connected to an output end of the first comparison valve (183), and the first comparison valve (183) communicates one of the first feedback oil path (181) and the second feedback oil path (182) which has a relatively large load pressure with the third feedback oil path (184).

8. The load-sensitive hydraulic system according to any one of claims 1 to 3, comprising a boom unit (300), an oil supply line (320) communicating with the first oil line (120), and an oil return line (330) communicating with the oil tank (110); the feedback unit (180) comprises a fourth feedback oil path (185), and the arm support unit (300) is used for amplitude variation action, rotation action and telescopic action of the arm support;

the oil inlet end of the arm support unit (300) is communicated with the oil supply oil way (320);

the oil return end of the arm support unit (300) is communicated with the oil return oil way (330);

the third feedback oil path (185) is communicated with the control end of the boom unit (300) to acquire the load pressure in the boom unit (300);

the third feedback oil path (185) can be connected to the load-sensitive port (103) to feed back the load pressure in the boom unit (300).

9. A load sensitive hydraulic system according to any one of claims 1 to 3, characterized in that the load sensitive hydraulic system comprises a second main pump (400), the output shaft of the second main pump (400) being connected in series with the power shaft of the first main pump (100).

10. The load sensitive hydraulic system of any one of claims 1 to 3, wherein the first predetermined pressure is 12-35MPa and the second predetermined pressure is 2-10 MPa.

11. An ice-removing vehicle comprising a heater, a first lance and a load sensitive hydraulic system as claimed in any one of claims 1 to 10;

the heater comprises an anti-icing pump, the first spray gun is connected with the anti-icing pump, and the first actuating element (160) is used for driving the anti-icing pump to operate.

Technical Field

The application relates to the technical field of hydraulic control, in particular to a load sensitive hydraulic system and an ice removing vehicle.

Background

Under the condition of icing, ice, snow and frost directly affect the running safety of the airplane, so that the outer surface of the airplane becomes rough, the weight of the airplane is increased, the moving range of an airplane control surface is limited, instrument errors are caused, the airplane is further stalled to be increased and is abnormally raised instantly in serious cases, the flight performance of the airplane is greatly reduced, particularly when the airplane takes off and rises, the flight attitude is difficult to control, and air crash is caused seriously. Therefore, in order to ensure normal shipping and flight safety, frost and accumulated snow on the surface of an airplane must be removed, and the current deicing vehicle applied to an airport has multiple functions of deicing, cleaning, spraying of anti-icing liquid and the like.

The self-propelled washing deicing vehicle is different from common engineering machinery, and needs to ensure that the anti-icing liquid spray gun can be opened and used immediately, namely that the anti-icing motor connected with the anti-icing liquid spray gun can continuously suppress pressure when the anti-icing liquid spray gun is in a closed state. On one hand, the hydraulic system needs to work frequently, the position of the ice removal gun is adjusted at any time, the optimal spraying direction and spraying distance are obtained, and the whole airplane needs to be covered. It is even necessary to spray while walking. On the other hand, the deicing fluid needs to be rapidly heated to about 85 degrees by a fluid heater and sprayed to the outer surface of the airplane to perform deicing. In cold areas, the aircraft is allowed to take off only by spraying the anti-icing liquid after the deicing is finished. The hydraulic system of the ice removing vehicle is quite complex in design.

In the related art, a constant pressure system is adopted for a cleaning and deicing vehicle to ensure that a certain pressure can be maintained in the system pressure, and once an anti-icing fluid spray gun is turned on, the anti-icing fluid which is heated to a predetermined temperature can be directly sprayed out. However, the constant pressure system adopts a throttle valve for speed regulation, so that large pressure loss is generated, and energy consumption is large; when the deicing operation is carried out in summer, the higher environmental temperature makes the cleaning deicing vehicle adopting the constant pressure system generate heat very seriously, and the heat balance effect of the whole vehicle and the service life of a hydraulic element are influenced.

Disclosure of Invention

In view of the above, embodiments of the present application are expected to provide a load-sensitive hydraulic system and an ice-removing vehicle, so as to improve the heating condition even when the pressure is suppressed.

In order to achieve the above purpose, the technical solution of the embodiment of the present application is implemented as follows:

a load sensitive hydraulic system comprising: the hydraulic control system comprises a first main pump, an oil tank, a first oil way, a first hydraulic control valve, a first execution element, a second oil way and a feedback unit; the first main pump can supply hydraulic oil with a first preset pressure to the first oil path; the first hydraulic control valve comprises a first port, a second port and a third port, the first port is communicated with the first oil path, the second port is communicated with the oil tank, the third port is connected with the second oil path, and the second oil path is communicated with the first execution element;

the first hydraulic control valve comprises a first state and a second state, the first executing element operates, the first hydraulic control valve is in the first state, and hydraulic oil in the first oil way is decompressed to a second preset pressure through the first hydraulic control valve and flows out of the third port; the first execution element stops running, the first hydraulic control valve is in a second state, the first port and the second port of the first hydraulic control valve can be communicated to achieve overflow, and hydraulic oil in the third port is kept at a second preset pressure; the feedback unit can acquire a load in the second oil passage and feed back to the first main pump.

Further, the feedback unit comprises a first feedback oil path, and the first main pump comprises an oil suction port for sucking oil from the oil tank, an oil supply port for supplying oil to a load, and a load sensitive port for feeding back load pressure to adjust displacement; the first oil path is connected with the oil supply port; the first feedback oil passage communicates with the second oil passage to acquire a load pressure in the second oil passage.

Further, the load-sensitive hydraulic system comprises a second hydraulic control valve, a first throttle valve and a third oil way; the third oil passage is communicated with the second oil passage, and the first throttle valve is arranged on the third oil passage; the second hydraulic valve is capable of selectively communicating the third port with the third oil passage.

Further, the load-sensitive hydraulic system comprises a second throttle valve and a fourth oil path; the fourth oil passage is communicated with the second oil passage, and the second throttle valve is arranged on the fourth oil passage; the second hydraulic valve may selectively communicate the third port with the third oil passage or the fourth oil passage.

Further, the second hydraulic valve includes a fourth port, a fifth port, and a sixth port, the third port communicates with the fourth port, the fifth port communicates with the third oil passage, and the sixth port communicates with the fourth oil passage; the second hydraulic control valve is provided with a left working position, a middle working position and a right working position; the second hydraulic control valve is in a left working position, and the fourth port is communicated with the sixth port; the second hydraulic control valve is in an intermediate working position, and the fourth port is disconnected from the fifth port and the sixth port; the second hydraulic control valve is in a right working position, and the fourth port is communicated with the fifth port.

Further, the first hydraulic control valve is a direct-acting type overflow reducing valve.

Further, the load-sensitive hydraulic system comprises a second execution element, a fifth oil path and a third hydraulic control valve; the feedback unit comprises a second feedback oil path, a first comparison valve and a third feedback oil path; the fifth oil passage is communicated with the second execution element; the third pilot-controlled valve is capable of selectively communicating the first oil passage with the fifth oil passage; the second feedback oil passage is communicated with the fifth oil passage to acquire load pressure in the fifth oil passage; the first feedback oil path and the second feedback oil path are respectively connected to input ends of two sides of the first comparison valve, the third feedback oil path is connected to an output end of the first comparison valve, and the first comparison valve communicates one of the first feedback oil path and the second feedback oil path, which has relatively large load pressure, with the third feedback oil path.

Further, the load-sensitive hydraulic system comprises an arm support unit, an oil supply oil way communicated with the first oil way and an oil return oil way communicated with the oil tank; the feedback unit comprises a fourth feedback oil path, and the boom unit is used for amplitude variation action, rotation action and telescopic action of the boom; the oil inlet end of the arm support unit is communicated with the oil supply oil way; the oil return end of the arm support unit is communicated with the oil return oil way; the third feedback oil path is communicated with the control end of the boom unit to acquire the load pressure in the boom unit; the third feedback oil path may be connected to the load sensitive port to feed back a load pressure in the boom unit.

Further, the load-sensitive hydraulic system comprises a second main pump, an output shaft of the second main pump being connected in series with a power shaft of the first main pump.

Further, the first preset pressure is 12-35Mpa, and the second preset pressure is 2-10 Mpa.

An ice removing vehicle comprises a heater, a first spray gun and the load sensitive hydraulic system; the heater comprises an anti-icing pump, the first spray gun is connected with the anti-icing pump, and the first execution element is used for driving the anti-icing pump to operate.

The load-sensitive hydraulic system and the deicing vehicle are provided with the first oil way, the first hydraulic control valve and the first execution element; the first executing element operates, the first hydraulic control valve comprises a first port, a second port and a third port, the first hydraulic control valve is in a first state, and hydraulic oil in the first oil way is decompressed to a second preset pressure through the first hydraulic control valve and flows out of the third port; when the first execution element stops operating, the first hydraulic control valve is in the second state, the first port and the second port of the first hydraulic control valve can be communicated to achieve overflow, hydraulic oil in the third port is kept at the second preset pressure, the pressure building function can be achieved by the section of the third port and the second oil way, the first main pump is guaranteed not to receive too high load from the second oil way, the first main pump can run under relatively low power, and heating is reduced.

Drawings

FIG. 1 is a schematic diagram of a load sensitive hydraulic system according to an embodiment of the present application;

FIG. 2 is an enlarged view of the load sensitive hydraulic system of FIG. 1 in area I;

FIG. 3 is a schematic diagram of a load sensitive hydraulic system according to another embodiment of the present application.

Detailed Description

It should be noted that, in the case of conflict, the technical features in the examples and examples of the present application may be combined with each other, and the detailed description in the specific embodiments should be interpreted as an explanation of the present application and should not be construed as an improper limitation of the present application.

In the description of the embodiments of the present application, the "up", "down", "left", "right", "front", "back" orientation or positional relationship is based on the orientation or positional relationship shown in fig. 1, it is to be understood that these orientation terms are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the present application.

As shown in fig. 1 to 3, a load-sensitive hydraulic system for work vehicle operation, includes: the hydraulic control system includes a first main pump 100, an oil tank 110, a first oil passage 120, a first pilot operated valve 130, a first actuator 160, a second oil passage 170, and a feedback unit 180.

The first main pump 100 communicates with the first oil passage 120; the first main pump 100 can supply hydraulic oil having a first preset pressure to the first oil passage 120. The first preset pressure is usually 12-35Mpa, which is set by the main relief valve 121 connected to the first oil passage 120, and prevents the first main pump 100 from being continuously loaded and pressurized.

The first hydraulic control valve 130 includes a first port 131, a second port 132 and a third port 133, the first port 131 is communicated with the first oil path 120, the second port 132 is communicated with the oil tank 110, the third port 133 is connected with the second oil path 170, and the second oil path 170 is communicated with an oil inlet of the first actuator 160; the oil outlet of the first actuator 160 is connected to the oil tank 110.

In the deicing vehicle, the anti-icing pump motor and the drive anti-icing pump operate, the anti-icing pump takes the anti-icing liquid in the waterway system out of the anti-icing liquid tank and injects the anti-icing liquid into the anti-icing liquid spray gun, the anti-icing liquid spray gun is provided with a switch, the anti-icing liquid spray gun is opened, the anti-icing liquid is sprayed out from a gun mouth under the action of the anti-icing pump at a certain pressure, the anti-icing pump normally operates at the moment, the anti-icing pump motor normally drives the anti-icing pump, and the hydraulic system continuously injects hydraulic oil at a certain pressure into the anti-icing pump motor. The anti-icing liquid spray gun is closed, the anti-icing liquid is accumulated on the anti-icing liquid spray gun at a certain pressure, the anti-icing pump is equivalent to one side with infinite load at the moment, the anti-icing pump stops acting, the load is transmitted to the anti-icing pump motor, the anti-icing pump motor stops running, and hydraulic oil in the hydraulic system keeps a pressure-building state.

The first hydraulic control valve 130 may be a direct acting relief valve; and simultaneously has the functions of an overflow valve and a pressure reducing valve.

When the first actuator 160 is operated, the first pilot valve 130 is in the first state, and the hydraulic oil in the first oil path 120 is depressurized to the second predetermined pressure by the first pilot valve 130 and flows out of the third port 133.

The first hydraulic control valve 130 functions as a pressure reducing valve at this time, and the first hydraulic control valve 130 can reduce the first preset pressure of the hydraulic oil in the first oil passage 120 to the second preset pressure of the hydraulic oil in the third port 133; the first actuator 160 obtains a second preset pressure of hydraulic oil, so as to drive the corresponding components to operate normally. Typically, the first predetermined pressure is greater than the second predetermined pressure, which is 2-10Mpa, set by the first pilot operated valve 130.

It should be understood that, in the related art, if the load fed back by one oil path of the load-sensitive hydraulic system is the largest of all the feedbacks, that is, the pressure of the oil path is the highest, the load-sensitive variable pump receiving the feedback can increase the output power according to the load and increase the pressure of the oil path, so that the oil path cannot be subjected to pressure holding normally, otherwise, the load-sensitive variable pump can increase the output power infinitely, and even if there is a main oil path overflow valve, the load-sensitive variable pump can always work under the maximum output power, and the energy consumption is too large and the heat is serious.

In the present embodiment, when the first actuator 160 is deactivated, the first pilot operated valve 130 is in the second state. The second oil path 170 is communicated with the oil inlet of the first actuator 160, and since the first actuator 160 stops operating, the oil is not fed in the oil inlet in reverse, and the hydraulic oil with the second preset pressure in the third port 133 cannot flow out, so that the hydraulic oil is in a pressure-building state.

The first port 131 and the second port 132 of the first pilot control valve 130 can be communicated to realize overflow, and the excess pressure oil returns to the oil tank 110, so that the hydraulic oil in the third port 133 is kept at the second preset pressure and cannot be continuously boosted by the hydraulic oil of the first preset pressure flowing in from the first port 131.

The feedback unit 180 can acquire the load in the second oil path 170, and specifically, the feedback unit 180 includes a first feedback oil path 181, the first main pump 100 may be a load-sensitive variable pump, and the first main pump 100 includes an oil suction port 101 for sucking oil from the oil tank 110, an oil supply port 102 for supplying oil to the load, and a load-sensitive port 103 for feeding back the load pressure to adjust the displacement. The first oil passage 120 is connected to the oil supply port 102. The first feedback oil path 181 communicates with the second oil path 170 to acquire the load, i.e., the hydraulic oil pressure, in the second oil path 170.

The second oil passage 170 is connected to the third port 133 and is maintained at a second preset pressure corresponding to a load; the feedback unit 180 can feed back the load in the second oil passage 170 to the first main pump 100, and the first main pump 100 adjusts output power according to the load, thereby supplying hydraulic oil of a first preset pressure to the first oil passage 120.

It is understood that in the pressure holding state of the load-sensitive hydraulic system in the related art, the pressure of the system is higher and higher, the power is higher and higher, and the heat generation is more and more serious.

In the embodiment of the present invention, if the first pilot control valve 130 is not provided, the load in the second oil path 170 will be quickly raised to the first preset pressure, and if the first preset pressure is set to 20MPa and the second preset pressure is set to 7MPa, the power output by the first main pump 100 with 20MPa as the load is quite different from the power output by the first main pump 100 with 7MPa as the load. The effect that can reach of the sensitive hydraulic system of load of this application embodiment at present is, it can realize holding out the pressure function to ensure this section of third port 133-second oil circuit 170 to ensure that first main pump 100 can not receive too high load from second oil circuit 170, and then make first main pump 100 can operate under relatively lower power, reduce and generate heat.

The section of the third port 133-the second oil path 170 can realize pressure holding, and can meet the requirement that some actuating elements in the engineering vehicle are opened and used immediately, that is, the opening and use means that hydraulic oil with certain pressure is always present in the actuating elements, for example, hydraulic oil with certain pressure is always present in the anti-icing pump motor for driving the anti-icing pump to run by the deicing vehicle, and the anti-icing pump motor runs by the anti-icing pump motor and the anti-icing liquid spray gun is opened and the anti-icing liquid is sprayed out. Of course, hydraulic components other than the anti-icing pump motor that require immediate on-demand may be suitable for use in the present load sensitive hydraulic system.

The load-sensitive hydraulic system of the embodiment of the application has lower energy consumption and less heat generation compared with a constant-pressure system under normal operation, and can suppress pressure to meet the function that the first execution element 160 is opened and used immediately, and can ensure that the first main pump 100 does not receive too high load from the second oil path 170 in the pressure suppressing process, so that the first main pump 100 can operate under relatively low power.

It is emphasized that, in the related art, for the load-sensitive hydraulic system, the feedback unit 180 is generally capable of obtaining the loads in the plurality of oil passages, comparing the magnitudes of the loads, and feeding the maximum load thereof back to the first main pump 100. Therefore, in the whole working process of the engineering vehicle equipped with the load-sensitive hydraulic system, the second preset load pressure in the second oil path 170 is not necessarily the maximum load, and at this time, the first main pump 100 outputs according to the feedback of the maximum load, and as long as the oil path of the maximum load is not in a pressure-holding state, this is a reasonable power regulation output and is also a characteristic and an advantage of the load-sensitive hydraulic system, but if the oil path of the maximum load is in a pressure-holding state, the first main pump 100 is caused to operate at the maximum power, which wastes energy and generates heat seriously.

The embodiment of the present application emphasizes the case where the third port 133-the second oil path 170 are under pressure, and the load in the second oil path 170 is the maximum load of the hydraulic system. For example, if the other actuators are turned off, the load received by the feedback unit 180 is 0, and the load in the second oil path 170 is the maximum load of the entire system. Taking an ice removing vehicle as an example, the boom unit 300 (mentioned below), the third actuator 260, the fourth actuator 270, the first actuator 160, and the second actuator 220 in fig. 1 may be fan motors, fuel pump motors, and ice removing motors, which are all started when ice removing liquid and ice removing liquid need to be heated, and can be closed when the temperature reaches, and all of them do not need to be opened and used immediately, and the boom unit 300 is also similar, and when the boom unit 300 needs to be operated, the boom unit 300 is opened, and when the boom unit does not need to be operated, the boom unit can be closed. In an extreme case, the blower motor, the fuel pump motor, the deicing motor, and the boom unit 300 are all closed, and oil is returned through pressure relief. However, the first actuator 160 serving as the anti-icing pump motor needs to maintain the pressure-holding state to satisfy the function of the anti-icing fluid spray gun that is ready to be opened, the loads received by the feedback unit 180 from the fan motor, the fuel pump motor, and the deicing motor are all 0, the boom unit 300 is also 0, at this time, the load in the second fluid passage 170 is the maximum load of the entire system, the first main pump 100 outputs according to the load in the second fluid passage 170, and the hydraulic oil in the third port 133 is maintained at the second preset pressure without being boosted by the first hydraulic control valve 130, so that the first main pump 100 is ensured not to receive an excessively high load, for example, the load is 20Mpa, so that the first main pump 100 can operate at a relatively low power, pressure-holding is achieved, and heat generation of the hydraulic system is reduced.

1-3, the load sensitive hydraulic system includes a second pilot operated valve 140, a first throttle 150, and a third oil passage 190.

The third oil passage 190 communicates with the second oil passage 170, and the third port 133 and the third oil passage 190 are connected by a second pilot operated valve 140.

The second pilot control valve 140 can selectively communicate the third port 133 with the third oil passage 190. Specifically, when the first pilot control valve 130 is in the first state or the second state, that is, the first actuator 160 is operating normally or is pressurized, the second pilot control valve 140 communicates the third port 133 with the third oil path 190, so that the first feedback oil path 181 can obtain the load in the second oil path 170. When the load-sensitive hydraulic system stops operating, the second pilot-controlled valve 140 disconnects the third port 133 from the third oil passage 190.

When the first pilot control valve 130 is in the first state, the hydraulic oil in the first oil path 120 is depressurized to a second preset pressure through the first pilot control valve 130 and flows out of the third port 133 to the first actuator 160, and the first throttle valve 150 is disposed on the third oil path 190, so that the flow rate of the output hydraulic oil can be stabilized, and the operation of the first actuator 160 is more stable and precise. Taking the first actuator 160 as an anti-icing pump motor as an example, the first throttle valve 150 can make the anti-icing pump motor more stable, thereby ensuring that the fluctuation of the flow rate of the anti-icing fluid sprayed from the anti-icing fluid spray gun is small, and ensuring that the anti-icing operation effect is good.

1-3, the load sensitive hydraulic system includes a second throttle 200 and a fourth oil path 210.

The fourth oil passage 210 communicates with the second oil passage 170, and the third port 133 and the fourth oil passage 210 are connected by the second pilot operated valve 140.

The second pilot control valve 140 can selectively communicate the third port 133 with the third oil passage 190 or the fourth oil passage 210.

Specifically, when the first pilot control valve 130 is in the first state or the second state, that is, the first actuator 160 is operating normally or is pressurized, the second pilot control valve 140 communicates the third port 133 with the third oil path 190, or the second pilot control valve 140 communicates the third port 133 with the fourth oil path 210.

So that the first feedback oil passage 181 can take the load in the second oil passage 170. When the load-sensitive hydraulic system stops operating, the second pilot operated valve 140 disconnects the third port 133 from the third/fourth oil passages 190, 210.

The second throttle valve 200 is disposed on the fourth oil path 210, and the first throttle valve 150 and the second throttle valve 200 are both adjustable throttle valves to stabilize the flow rate. However, it is to be distinguished that the first throttle 150 is a compensated throttle, which can be compensated for in the event of an unstable flow, so that the first throttle 150 is better for a flow stabilizing effect.

The second pilot control valve 140 includes a fourth port 141, a fifth port 142, and a sixth port 143, the third port 133 communicates with the fourth port 141, the fifth port 142 communicates with the third oil passage 190, and the sixth port 143 communicates with the fourth oil passage 210. The second hydraulic control valve 140 has a left working position, a middle working position, and a right working position;

specifically, the second hydraulic control valve 140 is in the left working position, the fourth port 141 is communicated with the sixth port 143, the second throttle valve 200 is connected with the third port 133, and the deicing vehicle performs self-suction of the anti-icing liquid spray gun outdoors, that is, when the anti-icing liquid in the barrel body is reversely sucked into the anti-icing liquid tank through the anti-icing liquid spray gun, the requirement on flow stability is not high, and the second throttle valve 200 generates less heat.

The second pilot control valve 140 is in the intermediate working position, the fourth port 141 and the fifth port 142 are disconnected, and the load-sensitive hydraulic system stops working, and the working position is maintained.

The second hydraulic control valve 140 is in the right working position, and the fourth port 141 is communicated with the fifth port 142; the first throttle valve 150 is connected with the third port 133, and the deicing vehicle adopting the load-sensitive hydraulic system of the embodiment of the application can adopt the first throttle valve 150 to stabilize the flow rate when deicing and anti-icing work is performed, thereby ensuring the anti-icing work effect.

In one possible embodiment, as shown in fig. 1 to 3, the load-sensitive hydraulic system includes a second actuator 220, a fifth oil path 240, and a third pilot-controlled valve 250. The fifth oil path 240 is communicated with an oil inlet of the second actuator 220; the oil outlet of the second actuator 220 is connected to the oil tank 110 to discharge oil thereto.

The third pilot valve 250 can selectively communicate the first oil passage 120 with the fifth oil passage 240; the third hydraulic control valve 250 may be a two-position two-way valve, which performs an on/off function. As shown in fig. 1, the third pilot operated valve 250 is a three-position three-way valve, in which the middle position is in an open state, the fifth oil path 240 returns to the oil tank 110, the left and right positions enable the first and fifth oil paths 120 and 240 to communicate, and the difference is that the right position enables an adjustable throttle valve 241 to be added therebetween to stabilize the flow rate.

The number of the second actuator 220 may be one or more, and may be a blower motor, a fuel pump motor or a de-icing motor as required to perform the corresponding function of the heater of the de-icing vehicle.

The feedback unit 180 includes a second feedback oil path 182, a first comparison valve 183, and a third feedback oil path 184.

The second feedback oil passage 182 communicates with the fifth oil passage 240 to acquire the load pressure in the fifth oil passage 240;

the first feedback oil path 181 and the second feedback oil path 182 are connected to input ends of both sides of the first comparison valve 183, respectively, the third feedback oil path 184 is connected to an output end of the first comparison valve 183, and the first comparison valve 183 may be a shuttle valve. The first comparator valve 183 communicates the third feedback oil passage 184 with one of the first feedback oil passage 181 and the second feedback oil passage 182, which has a relatively large load pressure; the third feedback oil path 184 is compared with the loads in the other feedback oil paths through other comparison valves until the maximum pressure in the load-sensitive hydraulic system is fed back to the load-sensitive port 103 of the first main pump 100.

1-3, the load-sensitive hydraulic system includes a boom unit 300, an oil supply path 320 communicating with the first oil path 120, and an oil return path 330 communicating with the oil tank 110; the feedback unit 180 includes a fourth feedback oil path 185 and a second comparison valve 186.

The boom unit 300 comprises a plurality of hydraulic oil cylinders or hydraulic motors, and the oil inlet end of the boom unit 300 is communicated with an oil supply oil path 320; the oil return end of the boom unit 300 is communicated with an oil return path 330; and then distributed to each hydraulic oil cylinder or hydraulic motor through an oil way and a hydraulic control valve group. The amplitude variation action, the rotation action and the telescopic action of the arm support are respectively realized through each hydraulic oil cylinder or each hydraulic motor.

The third feedback oil path 185 is communicated with the control end of the boom unit 300 to obtain the load pressure in the boom unit 300; the fourth feedback oil path 185 is connected to an input end of the second comparison valve 186; the third feedback oil path 185 can be connected to the load sensitive port 103 to feed back the load pressure in the boom unit 300.

1-3, the load-sensitive hydraulic system includes a second main pump 400 and a traveling unit 500, wherein an output shaft 401 of the second main pump 400 is connected in series with the power shaft 101 of the first main pump 100, and both can share a power motor 600, thereby reducing the cost of the load-sensitive hydraulic system. The second main pump 400 supplies oil to the traveling unit 500 for driving the work vehicle to move.

An ice removing vehicle comprises a chassis, an arm support, a heater, a first spray gun, a second spray gun and the load sensitive hydraulic system; the heater comprises a fan, a fuel pump, an anti-icing pump and a deicing pump, wherein the first spray gun is connected with the anti-icing pump, and the first execution element 160 is used for driving the anti-icing pump to operate.

The specific working process is generally divided into three stages.

In the preparation stage, generally, the deicing operation is carried out from the airport preparation position to the deicing operation working position, the power motor 600 drives the second main pump 400 and the first main pump 100 to rotate, and then the second main pump 400 drives the traveling unit 500 to move the deicing vehicle; the first main pump 100 drives the third actuator 260 serving as a fan motor, the fourth actuator 270 serving as a fuel pump motor, and the second actuator 220 serving as a deicing motor to operate together, so that in the moving process of the deicing vehicle, the deicing fluid and the anti-icing fluid are preheated, the deicing and anti-icing efficiency is improved, and the first actuator 160 serving as the anti-icing pump motor is subjected to pressure holding, so that the function of being ready to use is realized.

In the fixed-point operation stage, the deicing operation working position is reached, the power motor 600 drives the second main pump 400 and the first main pump 100 to rotate, wherein the load of the traveling unit 500 is extremely small because the deicing vehicle does not travel any more, most of the power motor 600 drives the first main pump 100 to drive the boom unit 300 to adjust to a proper working position, the third execution element 260 serving as a fan motor, the fourth execution element 270 serving as a fuel pump motor, and the second execution element 220 serving as a deicing motor operate together to heat the deicing fluid and the anti-icing fluid, and the first execution element 160 serving as an anti-icing pump motor is subjected to pressure holding, so that the function of being ready to start is realized.

And in the second-machine operation stage, the aircraft with huge volume is moved around the deicing operation working position for operation. The power motor 600 drives the second main pump 400 and the first main pump 100 to rotate, and then the second main pump 400 drives the traveling unit 500 to move the deicing vehicle; the first main pump 100 is used as a first actuator 160 of the anti-icing pump motor to realize the function of instant use; the third actuator 260 as a fan motor, the fourth actuator 270 as a fuel pump motor, and the second actuator 220 as a de-icing motor are turned on or off according to the temperatures of the de-icing fluid and the anti-icing fluid, so as to improve the de-icing and anti-icing efficiency and effect.

The various embodiments/implementations provided herein may be combined with each other without contradiction.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.