Hydraulic system and mobile equipment

Abstract

The present invention discloses a hydraulic system and a mobile device. The hydraulic system includes a main pump station hydraulic component, a horizontal movement hydraulic component, and a vertical lifting hydraulic component. The horizontal movement hydraulic component includes a plurality of horizontal oil cylinders, a first electromagnetic two-position four-way valve, a first proportional electro-hydraulic directional flow control valve, a double-control hydraulic lock, a double synchronous motor, and an electromagnetic three-position four-way valve. The vertical lifting hydraulic component includes a plurality of vertical oil cylinders, a second electromagnetic two-position four-way valve, a second proportional electro-hydraulic directional flow control valve, a double-control hydraulic lock, and a quadruple synchronous motor. The provision of the double synchronous motor and the quadruple synchronous motor can improve the synchronization of the extension and contraction of the horizontal movement hydraulic component and the vertical lifting hydraulic component. By switching the first electromagnetic two-position four-way valve and the second electromagnetic two-position four-way valve, and controlling the horizontal oil cylinder and the vertical oil cylinder through the first proportional electro-hydraulic directional flow control valve and the second proportional electro-hydraulic directional flow control valve, the oil cylinders can be synchronized, and the equipment can operate smoothly and reliably.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic equipment, and in particular to a hydraulic system and a mobile equipment. Background Art

[0002] Horizontal movement and vertical lift of equipment can be achieved through actuators such as mechanical, electric, pneumatic, and hydraulic drives. Actuator performance is crucial to ensuring smooth and reliable equipment movement. For equipment supported by two hydraulic lift cylinders, each at the front and rear, a reliable hydraulic system is required to ensure smooth and consistent lifting and lowering of each cylinder during vertical lift. For equipment pulled by two horizontal cylinders, each at the front and rear, a reliable hydraulic system is required to ensure smooth and consistent horizontal extension and retraction of each cylinder during horizontal movement. When the accumulated deviation from synchronization is significant, a method must be employed to realign the equipment to synchronization.

[0003] Currently, hydraulic systems are typically controlled using multi-way valves or synchronized hydraulic actuators. For example, the raising and lowering of a truck crane's chassis and the extension and retraction of its outriggers are typically controlled by a hydraulic multi-way valve, with each outrigger's raising and retracting controlled by a corresponding valve on the multi-way valve. Hydraulic actuators typically utilize synchronized hydraulic cylinders, synchronized hydraulic motors, and synchronized hydraulic valve blocks to control the synchronized movement of the equipment. Existing hydraulic systems can be difficult to synchronize when significant cumulative deviations in synchronization occur. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a hydraulic system with fast synchronization adjustment and strong synchronization.

[0005] The present invention also provides a mobile equipment having the hydraulic system.

[0006] A hydraulic system according to a first embodiment of the present invention comprises:

[0007] A main pump station hydraulic assembly, comprising a motor, an oil tank and a hydraulic oil pump, wherein the hydraulic oil pump is connected to the oil tank;

[0008] A horizontal movement hydraulic assembly, comprising a plurality of horizontal oil cylinders, a first electromagnetic two-position four-way valve, a first proportional electro-hydraulic directional flow control valve, a dual-control hydraulic lock, a double synchronous motor, and an electromagnetic three-position four-way valve. The first electromagnetic two-position four-way valve is used to switch between synchronous extension and extension of the horizontal oil cylinders and independent extension and extension. The first proportional electro-hydraulic directional flow control valve is used to control the oil supply direction and flow of the horizontal oil cylinders. The double synchronous motor is used to control the synchronous extension and extension of the horizontal oil cylinders. The electromagnetic three-position four-way valve is used to control the extension and extension direction of the horizontal oil cylinders.

[0009] A vertical lifting hydraulic assembly, comprising a plurality of vertical oil cylinders, a second electromagnetic two-position four-way valve, a second proportional electro-hydraulic directional flow control valve, a dual-control hydraulic lock, and a quadruple synchronous motor. The second electromagnetic two-position four-way valve is used to switch between synchronous extension and extension of the vertical oil cylinders and independent extension and retraction. The second proportional electro-hydraulic directional flow control valve is used to control the oil supply direction and flow of the vertical oil cylinders. The quadruple synchronous motor is used to control the synchronous extension and retraction of the vertical oil cylinders.

[0010] Among them, the main pump station hydraulic component is connected to the horizontal movement hydraulic component and the vertical lifting hydraulic component through the main pressure oil pipe, and the main pump station hydraulic component is connected to the horizontal movement hydraulic component and the vertical lifting hydraulic component through the main return oil pipe.

[0011] According to a first embodiment of the present invention, a hydraulic system has at least the following beneficial effects: a hydraulic system of the present invention includes a main pump station hydraulic component, a horizontal movement hydraulic component and a vertical lifting hydraulic component, the horizontal movement hydraulic component includes a plurality of horizontal oil cylinders, a first electromagnetic two-position four-way valve, a first proportional electro-hydraulic directional flow control valve, a double-control hydraulic lock, a double synchronous motor and an electromagnetic three-position four-way valve, and the vertical lifting hydraulic component includes a plurality of vertical oil cylinders, a second electromagnetic two-position four-way valve, a second proportional electro-hydraulic directional flow control valve, a double-control hydraulic lock and a quadruple synchronous motor, and the arrangement of the double synchronous motor and the quadruple synchronous motor can improve the synchronization of the extension and contraction of the horizontal movement hydraulic component and the vertical lifting hydraulic component. When the synchronization cumulative error is large during long-term operation or the synchronous motor fails, the horizontal oil cylinder and the vertical oil cylinder can be controlled by switching the first electromagnetic two-position four-way valve and the second electromagnetic two-position four-way valve, and by the first proportional electro-hydraulic directional flow control valve and the second proportional electro-hydraulic directional flow control valve, so that each oil cylinder can be synchronized and the equipment can operate smoothly and reliably.

[0012] According to some embodiments of the present invention, several of the horizontal cylinders include a rod cavity and a rodless cavity.

[0013] According to some embodiments of the present invention, the horizontal movement hydraulic assembly is provided with an electromagnetic two-position two-way valve, and the electromagnetic two-position two-way valve is used to control the on-off of a plurality of the rod chambers.

[0014] According to some embodiments of the present invention, several of the vertical cylinders include a rod cavity and a rodless cavity.

[0015] According to some embodiments of the present invention, the vertical lifting hydraulic assembly is provided with a balancing valve and a hydraulically controlled one-way valve, and the balancing valve and the hydraulically controlled one-way valve are installed on the connecting pipeline between the rodless chamber and the rod chamber.

[0016] According to some embodiments of the present invention, both the horizontal movement hydraulic assembly and the vertical lifting hydraulic assembly are provided with a throttle valve for throttling.

[0017] According to some embodiments of the present invention, there are four horizontal cylinders, including a front left horizontal cylinder, a rear left horizontal cylinder, a front right horizontal cylinder, and a rear right horizontal cylinder; there are four vertical cylinders, including a front left vertical cylinder, a rear left vertical cylinder, a front right vertical cylinder, and a rear right vertical cylinder.

[0018] According to some embodiments of the present invention, the fuel tank is provided with a fuel tank drain plug, a liquid level thermometer, an oil temperature alarm, a liquid level alarm, an air filter, a double-barrel return oil filter and an air-cooled oil cooler. The fuel tank is also connected to an oil outlet pipeline and an oil return pipeline. The double-barrel return oil filter is arranged on the oil return pipeline to filter impurities in the return oil; the air-cooled oil cooler is arranged on the oil return pipeline to cool the return oil temperature.

[0019] According to some embodiments of the present invention, several hydraulic oil pumps are provided, the inlet of the hydraulic oil pump is connected to the oil tank through an oil suction line, and the outlet of the hydraulic oil pump is connected to the horizontal oil cylinder and the vertical oil cylinder through an oil supply line, and the oil supply line is provided with a pressure gauge, a pressure gauge switch, a pressure sensor and a pilot overflow valve.

[0020] A mobile device according to a second embodiment of the present invention includes a hydraulic system according to the first embodiment of the present invention.

[0021] The mobile device according to the second embodiment of the present invention has at least the following beneficial effects: a mobile device of the present invention, using the hydraulic system of the first embodiment, includes a main pump station hydraulic assembly, a horizontal movement hydraulic assembly, and a vertical lift hydraulic assembly, wherein the horizontal movement hydraulic assembly includes a plurality of horizontal cylinders, a first electromagnetic two-position four-way valve, a first proportional electro-hydraulic directional flow control valve, a double-control hydraulic lock, a double synchronous motor, and an electromagnetic three-position four-way valve, and the vertical lift hydraulic assembly includes a plurality of vertical cylinders, a second electromagnetic two-position four-way valve, a second proportional electro-hydraulic directional flow control valve, a double-control hydraulic lock, and a quadruple synchronous motor, and the arrangement of the double synchronous motor and the quadruple synchronous motor can improve the synchronization of the extension and contraction of the horizontal movement hydraulic assembly and the vertical lift hydraulic assembly. When the accumulated synchronization error is large during long-term operation or the synchronous motor fails, the horizontal cylinder and the vertical cylinder can be controlled by switching the first electromagnetic two-position four-way valve and the second electromagnetic two-position four-way valve, and by the first proportional electro-hydraulic directional flow control valve and the second proportional electro-hydraulic directional flow control valve, so that the cylinders can be synchronized and the device can operate smoothly and reliably.

[0022] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0024] Figure 1 This is a schematic structural diagram of a hydraulic assembly of a main pump station according to an embodiment of the present invention;

[0025] Figure 2 This is a schematic structural diagram of a horizontally movable hydraulic assembly according to an embodiment of the present invention;

[0026] Figure 3 It is a structural schematic diagram of a vertical lifting hydraulic assembly according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0028] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, inside, outside, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0029] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0030] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, assembling, and matching should be understood in a broad sense. Technical personnel in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0031] Refer to the following Figures 1 to 3 A hydraulic system according to an embodiment of the present invention is described.

[0032] A hydraulic system according to an embodiment of the present invention, such as Figures 1 to 3 As shown, it includes a main pump station hydraulic component, a horizontal movement hydraulic component and a vertical lifting hydraulic component. The main pump station hydraulic component includes a motor 120, an oil tank 100 and a hydraulic oil pump 130. The hydraulic oil pump 130 is connected to the oil tank 100. The hydraulic oil pump 130 draws oil from the oil tank 100 and transports it to the horizontal movement hydraulic component and the vertical lifting hydraulic component.

[0033] The horizontal movement hydraulic assembly includes several horizontal cylinders, a first electromagnetic two-position four-way valve 260, a first proportional electro-hydraulic directional flow control valve 240, a dual-control hydraulic lock 230, a double synchronous motor 250 and an electromagnetic three-position four-way valve 270. The first electromagnetic two-position four-way valve 260 is used to realize the switching between synchronous extension and extension of the horizontal cylinder and independent extension and extension. The first proportional electro-hydraulic directional flow control valve 240 is used to control the oil supply direction and flow of the horizontal cylinder. The double synchronous motor 250 is used to control the synchronous extension and extension of the horizontal cylinder. The electromagnetic three-position four-way valve 270 is used to control the extension and extension direction of the horizontal cylinder. Specifically, first solenoid two-position, four-way valve 260 is a switching valve. Its oil inlet is connected to the oil supply line of hydraulic oil pump 130. When powered off, its oil outlet is connected to the oil inlet of first proportional electro-hydraulic directional flow control valve 240. When powered on, its oil outlet is disconnected from the oil inlet of first proportional electro-hydraulic directional flow control valve 240. In the horizontal hydraulic system, switching the first solenoid two-position, four-way valve 260 between power on and power off enables switching between synchronized and independent extension and retraction of the horizontal cylinders. In the horizontal lifting hydraulic system, when the first electromagnetic two-position four-way valve 260 is in the power-off state, it can control the oil supply direction and flow of each horizontal cylinder by controlling the first proportional electro-hydraulic directional flow control valve 240 corresponding to each horizontal cylinder, thereby achieving adjustment to synchronization when the horizontal cylinders are out of sync; it can also achieve synchronous control of the horizontal cylinders when the dual synchronous motor 250 fails.

[0034] In some embodiments, four horizontal cylinders are provided, including a front left horizontal cylinder 212, a rear left horizontal cylinder 211, a front right horizontal cylinder 214, and a rear right horizontal cylinder 213. A dual synchronous motor 250 is used to control the synchronous extension and retraction of the front left horizontal cylinder 212, the rear left horizontal cylinder 211, the front right horizontal cylinder 214, and the rear right horizontal cylinder 213. Specifically, the dual synchronous motor 250 has an oil inlet, a first oil outlet, a second oil outlet, and an oil return port. The first oil outlet of the dual synchronous motor 250 communicates with the first oil inlet of the dual-control hydraulic lock 230, which in turn communicates with the rodless cavity of the rear left horizontal cylinder 211. The second oil outlet of the dual synchronous motor 250 communicates with the second oil inlet of the dual-control hydraulic lock 230, which in turn communicates with the rodless cavity of the rear right horizontal cylinder 213.

[0035] In the horizontal hydraulic assembly, each horizontal cylinder is equipped with a solenoid three-position, four-way valve 270. Controlling this valve controls the oil supply direction, thereby controlling the extension and retraction direction of the horizontal cylinder. This valve has an oil inlet, a first oil outlet, a second oil outlet, and an oil return port. The first oil outlet of this valve communicates with the first oil inlet of the dual-control hydraulic lock 230, which in turn communicates with the rod-operated chamber of each horizontal cylinder. The second oil outlet of this valve communicates with the second oil inlet of the dual-control hydraulic lock 230, which in turn communicates with the rodless chamber of each horizontal cylinder.

[0036] The vertical lifting hydraulic assembly includes several vertical cylinders, a second electromagnetic two-position four-way valve 360, a second proportional electro-hydraulic directional flow control valve 350, a dual-control hydraulic lock 230 and a four-way synchronous motor 340. The second electromagnetic two-position four-way valve 360 is used to realize the switching between synchronous extension and extension and independent extension of the vertical cylinder. The second proportional electro-hydraulic directional flow control valve 350 is used to control the oil supply direction and flow of the vertical cylinder. The four-way synchronous motor 340 is used to control the synchronous extension and extension of the vertical cylinder. The second solenoid two-position, four-way valve 360 is used to switch between synchronized and independent extension and retraction of the vertical cylinders. Specifically, the second solenoid two-position, four-way valve 360 is a switching valve. The oil inlet of the second solenoid two-position, four-way valve 360 is connected to the oil supply line of the hydraulic oil pump 130. When powered off, the oil outlet of the second solenoid two-position, four-way valve 360 is connected to the oil inlet of the second proportional electro-hydraulic directional flow control valve 350. When powered on, the oil outlet of the second solenoid two-position, four-way valve 360 is disconnected from the oil inlet of the second proportional electro-hydraulic directional flow control valve 350. In the vertical hydraulic system, switching the second solenoid two-position, four-way valve 360 between de-energization and re-energization enables switching between synchronized and independent extension and retraction of the vertical cylinders. In the vertical lifting hydraulic system, when the second electromagnetic two-position four-way valve 360 is in the power-off state, it can control the oil supply direction and flow of each vertical cylinder by controlling the second proportional electro-hydraulic directional flow control valve 350 corresponding to each vertical cylinder, thereby achieving adjustment to synchronization when the vertical cylinders are out of sync; it can also achieve synchronous control of each vertical cylinder when the quadruple synchronous motor 340 fails.

[0037] In some embodiments, four vertical cylinders are provided, including a front left vertical cylinder 311, a rear left vertical cylinder 312, a front right vertical cylinder 313, and a rear right vertical cylinder 314. A quadruple synchronous motor 340 is used to control the synchronous extension and retraction of the front left vertical cylinder 311, the rear left vertical cylinder 312, the front right vertical cylinder 313, and the rear right vertical cylinder 314.

[0038] The proportional electro-hydraulic directional flow control valve includes a first proportional electro-hydraulic directional flow control valve 240 and a second proportional electro-hydraulic directional flow control valve 350. Each proportional electro-hydraulic directional flow control valve has an oil inlet, an oil return port, a first oil outlet, and a second oil outlet. When powered off, the first and second oil outlets of the proportional electro-hydraulic directional flow control valves are connected to the oil return port, which can return oil to the oil tank 100. By controlling the proportional electro-hydraulic directional flow control valves, the direction and flow of oil supply can be controlled, thereby controlling the direction and speed of cylinder extension and retraction.

[0039] A hydraulic system of the present invention includes a main pump station hydraulic component, a horizontal movement hydraulic component and a vertical lifting hydraulic component. The horizontal movement hydraulic component includes several horizontal cylinders, a first electromagnetic two-position four-way valve 260, a first proportional electro-hydraulic directional flow control valve 240, a double-control hydraulic lock 230, a double synchronous motor 250 and an electromagnetic three-position four-way valve 270. The vertical lifting hydraulic component includes several vertical cylinders, a second electromagnetic two-position four-way valve 360, a second proportional electro-hydraulic directional flow control valve 350, a double-control hydraulic lock 230 and a quadruple synchronous motor 340. The setting of the double synchronous motor 250 and the quadruple synchronous motor 340 can improve the synchronization of the extension and contraction of the horizontal movement hydraulic component and the vertical lifting hydraulic component. When the accumulated synchronization error is large during long-term operation or the synchronous motor fails, the horizontal cylinder and the vertical cylinder are controlled by switching the first electromagnetic two-position four-way valve 260 and the second electromagnetic two-position four-way valve 360 through the first proportional electro-hydraulic directional flow control valve 240 and the second proportional electro-hydraulic directional flow control valve 350, so that the cylinders can be synchronized and the equipment can operate smoothly and reliably.

[0040] According to some embodiments of the present invention, the plurality of horizontal cylinders each include a rod chamber and a rodless chamber. In some embodiments, four horizontal cylinders are provided, including a front left horizontal cylinder 212, a rear left horizontal cylinder 211, a front right horizontal cylinder 214, and a rear right horizontal cylinder 213.

[0041] According to some embodiments of the present invention, the horizontal movement hydraulic assembly is equipped with a solenoid two-way valve 220, which is used to control the opening and closing of several rod chambers. The solenoid two-way valve 220 has an oil inlet and an oil outlet. When the power is off, the oil inlet and oil outlet of the solenoid two-way valve 220 are connected; when the power is on, the oil inlet and oil outlet of the solenoid two-way valve 220 are disconnected. The oil inlet of the solenoid two-way valve 220 is connected to the rod chamber of the rear left horizontal cylinder 211, and the oil outlet is connected to the rod chamber of the front left horizontal cylinder 212. The oil inlet of the solenoid two-way valve 220 is connected to the rod chamber of the rear right horizontal cylinder 213, and the oil outlet is connected to the rod chamber of the front right horizontal cylinder 214. When the power is off, the rod chambers of the horizontal cylinders are connected, achieving synchronized extension and retraction. When the power is on, the rod chambers of the horizontal cylinders are disconnected, allowing each horizontal cylinder to control its own extension and retraction.

[0042] According to some embodiments of the present invention, the plurality of vertical cylinders each include a rod chamber and a rodless chamber. In some embodiments, four vertical cylinders are provided, including a front left vertical cylinder 311, a rear left vertical cylinder 312, a front right vertical cylinder 313, and a rear right vertical cylinder 314.

[0043] According to some embodiments of the present invention, the vertical lifting hydraulic assembly is provided with a balancing valve 320 and a hydraulically controlled one-way valve 330, which are installed on the connecting pipes between the rodless chamber and the rod chamber. The balancing valve 320 and the hydraulically controlled one-way valve 330 are installed on the connecting pipes between the rodless chamber and the rod chamber of the vertical oil cylinder. When the hydraulic oil pump 130 is not working or the oil supply line leaks, resulting in insufficient oil supply line pressure, the provision of the balancing valve 320 and the hydraulically controlled one-way valve 330 can prevent the oil cylinder from retracting downward and causing the equipment base to fall downward, thereby ensuring the safety of the equipment.

[0044] According to some embodiments of the present invention, both the horizontal movement hydraulic assembly and the vertical lifting hydraulic assembly are provided with a throttle valve 410 for throttling. The throttle valve 410 has an oil inlet and an oil outlet, and can adjust the amount of oil passing through.

[0045] According to some embodiments of the present invention, the horizontal movement hydraulic assembly and the vertical lifting hydraulic assembly are further provided with a dual-control hydraulic lock 230. In the vertical lifting hydraulic assembly, each vertical oil cylinder is equipped with a second proportional electro-hydraulic directional flow control valve 350. The oil inlet of the second proportional electro-hydraulic directional flow control valve 350 is connected to the oil outlet of the throttle valve 410. The first oil outlet of the second proportional electro-hydraulic directional flow control valve 350 is connected to the first oil inlet of the dual-control hydraulic lock 230. The first oil outlet of the dual-control hydraulic lock 230 is connected to the rod cavity of each vertical oil cylinder. The second oil outlet of the second proportional electro-hydraulic directional flow control valve 350 is connected to the second oil inlet of the dual-control hydraulic lock 230. The second oil outlet of the dual-control hydraulic lock 230 is connected to the rodless cavity of each vertical oil cylinder.

[0046] According to some embodiments of the present invention, the fuel tank 100 is provided with a fuel tank drain plug, a liquid level thermometer 154, an oil temperature alarm 153, a liquid level alarm 152, an air filter 151, a double-tube return oil filter 155 and an air-cooled oil cooler 156. The fuel tank 100 is also connected to an oil outlet pipeline and an oil return pipeline. The double-tube return oil filter 155 is provided on the return oil pipeline to filter impurities in the return oil; the air-cooled oil cooler 156 is provided on the return oil pipeline to cool the return oil temperature.

[0047] According to some embodiments of the present invention, multiple hydraulic oil pumps 130 are provided. The inlet of the hydraulic oil pump 130 is connected to the oil tank 100 via an oil suction line, and the outlet of the hydraulic oil pump 130 is connected to the horizontal and vertical cylinders via oil supply lines. The oil supply lines are equipped with a pressure gauge, a pressure gauge switch, a pressure sensor, and a pilot-operated relief valve 140. Specifically, the inlet of the hydraulic oil pump 130 is connected to the oil tank 100 via an oil suction hose, a ball valve, and an oil suction line. The outlet of the hydraulic oil pump 130 provides pressurized oil to the horizontal motion hydraulic assembly and the vertical lift hydraulic assembly via a high-pressure hose, a check valve, a high-pressure ball valve, and an oil supply line. The pressure sensor transmits the pressure value to the pressure gauge, which displays the pressure on the screen. The pilot-operated relief valve 140 sets the maximum pressure for the entire hydraulic system. In some embodiments, the hydraulic oil pump 130 can be configured as a fixed-displacement pump or a variable-displacement pump, and the number of hydraulic oil pumps 130 can be single or multiple in parallel.

[0048] According to the second embodiment of the present invention, a mobile device includes a hydraulic system according to the first embodiment of the present invention. A mobile device of the present invention uses the hydraulic system according to the first embodiment, including a main pump station hydraulic component, a horizontal movement hydraulic component and a vertical lifting hydraulic component. The horizontal movement hydraulic component includes a number of horizontal oil cylinders, a first electromagnetic two-position four-way valve 260, a first proportional electro-hydraulic directional flow control valve 240, a dual-control hydraulic lock 230, a dual synchronous motor 250 and an electromagnetic three-position four-way valve 270. The vertical lifting hydraulic component includes a number of vertical oil cylinders, a second electromagnetic two-position four-way valve 360, a second proportional electro-hydraulic directional flow control valve 350, a dual-control hydraulic lock 230 and a quadruple synchronous motor 340. The arrangement of the dual synchronous motor 250 and the quadruple synchronous motor 340 can improve the synchronization of the extension and contraction of the horizontal movement hydraulic component and the vertical lifting hydraulic component. When the accumulated synchronization error is large during long-term operation or the synchronous motor fails, the horizontal cylinder and the vertical cylinder are controlled by switching the first electromagnetic two-position four-way valve 260 and the second electromagnetic two-position four-way valve 360 through the first proportional electro-hydraulic directional flow control valve 240 and the second proportional electro-hydraulic directional flow control valve 350, so that the cylinders can be synchronized and the equipment can operate smoothly and reliably.

[0049] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the scope of the present invention.

Claims

1. A hydraulic system, characterized in that: include: A main pump station hydraulic assembly, comprising a motor, an oil tank and a hydraulic oil pump, wherein the hydraulic oil pump is connected to the oil tank; A horizontal movement hydraulic assembly, comprising a plurality of horizontal oil cylinders, a first electromagnetic two-position four-way valve, a first proportional electro-hydraulic directional flow control valve, a dual-control hydraulic lock, a double synchronous motor, and an electromagnetic three-position four-way valve. The first electromagnetic two-position four-way valve is used to switch between synchronous extension and extension of the horizontal oil cylinders and independent extension and extension. The first proportional electro-hydraulic directional flow control valve is used to control the oil supply direction and flow of the horizontal oil cylinders. The double synchronous motor is used to control the synchronous extension and extension of the horizontal oil cylinders. The electromagnetic three-position four-way valve is used to control the extension and extension direction of the horizontal oil cylinders. A vertical lifting hydraulic assembly, comprising a plurality of vertical oil cylinders, a second electromagnetic two-position four-way valve, a second proportional electro-hydraulic directional flow control valve, a dual-control hydraulic lock, and a quadruple synchronous motor. The second electromagnetic two-position four-way valve is used to switch between synchronous extension and extension of the vertical oil cylinders and independent extension and retraction. The second proportional electro-hydraulic directional flow control valve is used to control the oil supply direction and flow of the vertical oil cylinders. The quadruple synchronous motor is used to control the synchronous extension and retraction of the vertical oil cylinders. The main pump station hydraulic assembly is connected to the horizontal movement hydraulic assembly and the vertical lift hydraulic assembly through the main pressure oil pipe, and the main pump station hydraulic assembly is connected to the horizontal movement hydraulic assembly and the vertical lift hydraulic assembly through the main return oil pipe; There are four horizontal cylinders, including a front left horizontal cylinder, a rear left horizontal cylinder, a front right horizontal cylinder, and a rear right horizontal cylinder; there are four vertical cylinders, including a front left vertical cylinder, a rear left vertical cylinder, a front right vertical cylinder, and a rear right vertical cylinder; The fuel tank is provided with a fuel tank drain plug, a liquid level thermometer, an oil temperature alarm, a liquid level alarm, an air filter, a double-tube return oil filter and an air-cooled oil cooler. The fuel tank is also connected to an oil outlet pipeline and an oil return pipeline. The double-tube return oil filter is provided on the oil return pipeline to filter impurities in the return oil; the air-cooled oil cooler is provided on the oil return pipeline to cool the return oil temperature; The hydraulic oil pumps are provided with several units, the inlet of the hydraulic oil pump is connected to the oil tank through an oil suction line, and the outlet of the hydraulic oil pump is connected to the horizontal oil cylinder and the vertical oil cylinder through an oil supply line. The oil supply line is provided with a pressure gauge, a pressure gauge switch, a pressure sensor and a pilot overflow valve.

2. A hydraulic system according to claim 1, characterized in that: Several of the horizontal oil cylinders include a rod cavity and a rodless cavity.

3. A hydraulic system according to claim 2, characterized in that: The horizontal movement hydraulic assembly is provided with an electromagnetic two-position two-way valve, and the electromagnetic two-position two-way valve is used to control the on-off of a plurality of the rod chambers.

4. A hydraulic system according to claim 1, characterized in that: Several of the vertical oil cylinders include a rod cavity and a rodless cavity.

5. A hydraulic system according to claim 4, characterized in that: The vertical lifting hydraulic assembly is provided with a balancing valve and a hydraulically controlled one-way valve, and the balancing valve and the hydraulically controlled one-way valve are installed on the connecting pipeline between the rodless chamber and the rod chamber.

6. A hydraulic system according to claim 1, characterized in that: The horizontal movement hydraulic assembly and the vertical lifting hydraulic assembly are both provided with a throttle valve for throttling.

7. A mobile device, characterized in that A hydraulic system comprising any one of claims 1 to 6.

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