An oil return protection hydraulic system with a mutual rescue function

Abstract

The present invention discloses an oil return protection hydraulic system with a mutual rescue function, comprising: an oil tank, an oil pump, a power take-off, a mutual rescue pipeline, a multi-way valve, an actuator and an oil return protection device; the oil pump is installed on the power take-off; the oil inlet pipe of the oil pump communicates with the oil tank, the oil outlet pipe of the oil pump is connected to the multi-way valve, the multi-way valve communicates with the oil tank through an oil tank return pipe, and the multi-way valve and the actuator are connected through an oil pipe; the equipment to be mutually rescued is respectively connected to the oil outlet pipe of the oil pump and the oil tank return pipe through two mutual rescue pipelines; the oil return protection device is arranged on the oil tank return pipe and is located between the connection point between the mutual rescue pipeline and the oil tank return pipe and the oil tank, and is used for controlling the on-off of the oil return oil path between the actuator and the oil tank and protecting the system from oil return; the present invention can avoid the situation that when the oil return protection device on the oil return pipeline of the rescued party is forgotten to be opened, the continuous oil supply of the hydraulic system will damage the tail plate of the multi-way valve and other hydraulic components.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydraulics, and particularly relates to an oil return protection hydraulic system with a mutual rescue function. Background Art

[0002] When conducting mutual rescue between equipment, in order to ensure that the hydraulic oil sucked from the fuel tank of the rescue equipment finally returns to the hydraulic fuel tank of the rescue equipment, a blocking device needs to be installed on the pipeline of the hydraulic oil return tank of the equipment to be rescued; after the mutual rescue work is completed, the blocking device on the pipeline of the return tank of the equipment to be rescued is then opened.

[0003] However, after the mutual rescue work is completed, there may be a situation where the blocking device on the return pipeline of the equipment to be rescued is forgotten to be opened; at this time, after the hydraulic system fault of the equipment to be rescued is eliminated and the power take-off restarts power taking and the hydraulic system supplies oil, if the blocking device is still in the closed state and the oil return pipeline is blocked, continuous oil supply by the hydraulic system will cause damage to the tail plate of the multi-way valve and other hydraulic components. Summary of the Invention

[0004] In view of this, the present invention provides an oil return protection hydraulic system with a mutual rescue function, which can prevent the hydraulic system from taking power when the blocking device on the oil return pipeline of the equipment to be rescued is forgotten to be opened, or after the hydraulic system normally takes power, the hydraulic oil in the oil return pipeline can return to the fuel tank normally, thereby avoiding the situation where the oil return pipeline is blocked and continuous oil supply by the hydraulic system will cause damage to the tail plate of the multi-way valve and other hydraulic components.

[0005] The present invention is realized through the following technical solutions:

[0006] An oil return protection hydraulic system with a mutual rescue function includes: a fuel tank, an oil pump, a power take-off, a mutual rescue pipeline, a multi-way valve, and an actuator; the oil pump is installed on the power take-off, and the power take-off is communicated with the equipment air source through an air pipe; the oil inlet pipe of the oil pump is communicated with the fuel tank, the oil outlet pipe of the oil pump is connected to the multi-way valve, the multi-way valve is communicated with the fuel tank through a fuel tank return pipe, and the multi-way valve and the actuator are connected through an oil pipe;

[0007] The equipment to be mutually rescued is connected to the quick connectors provided on the oil outlet pipe of the oil pump and the fuel tank return pipe through two mutual rescue pipelines, wherein the two mutual rescue pipelines are respectively a mutual rescue inlet pipe and a mutual rescue return pipe;

[0008] The oil return protection hydraulic system further includes an oil return protection device, which is arranged on the fuel tank return pipe and is located between the connection point between the mutual rescue pipeline and the fuel tank return pipe and the fuel tank, and is used to control the on-off of the oil return circuit between the actuator and the fuel tank and perform oil return protection on the system.

[0009] Further, the oil return protection device adopts a manual ball valve. An air hole A is machined on the inner ball core of the manual ball valve, and two coaxial air holes B are respectively machined on two opposite sides of the manual ball valve; one air hole B is connected to the equipment air source through a section of air pipe, and the other air hole B is connected to the power take-off through another section of air pipe; by rotating the ball core of the manual ball valve, the on-off of the air path of the power take-off between the power take-off and the equipment air source can be realized; when the air hole A on the inner ball core of the manual ball valve is coaxially opposite to the two air holes B, the air hole A is communicated with the two air holes B, and the air path of the power take-off is communicated. When the air hole A on the inner ball core of the manual ball valve forms a 90-degree angle with the axes of the two air holes B, the air path of the power take-off is disconnected; and the opening and closing of the air path of the power take-off are synchronized with the on-off of the oil return oil path. When the air path of the power take-off is communicated, the oil return oil path is synchronously communicated. When the air path of the power take-off is disconnected, the oil return oil path is synchronously disconnected, and the air path of the power take-off and the oil return oil path do not intersect.

[0010] Further, the oil return protection device adopts a two-position two-way solenoid ball valve; the solenoid ball valve is connected to the equipment power supply through an electric wire; the opening and closing of the solenoid ball valve are controlled by controlling the on-off of the solenoid ball valve. After the equipment power supply is powered on, the solenoid ball valve is powered on and automatically opens. After the equipment power supply is powered off, the solenoid ball valve is powered off and automatically closes; and the power take-off is also electrically connected to the equipment power supply. After the equipment power supply is powered on, the power take-off can be powered on and operate.

[0011] Further, an interface for the mutual rescue inlet oil pipe is also provided on the oil outlet pipe of the oil pump, and an interface for the mutual rescue return oil pipe is also provided on the oil tank return oil pipe;

[0012] When the interface for the mutual rescue inlet oil pipe is docked with the quick connector on the oil outlet pipe of the oil pump, the oil outlet pipe of the oil pump is communicated. When the interface for the mutual rescue inlet oil pipe is disconnected from the quick connector on the oil outlet pipe of the oil pump, the oil outlet pipe of the oil pump is disconnected, and the interface for the mutual rescue inlet oil pipe is connected to the equipment to be mutually rescued through the mutual rescue inlet oil pipe;

[0013] When the interface for the mutual rescue return oil pipe is docked with the quick connector on the oil tank return oil pipe, the oil tank return oil pipe is communicated. When the interface for the mutual rescue return oil pipe is disconnected from the quick connector on the oil tank return oil pipe, the oil tank return oil pipe is disconnected, and the interface for the mutual rescue return oil pipe is connected to the equipment to be mutually rescued through the mutual rescue return oil pipe;

[0014] The oil return protection device adopts a relief valve connected in parallel to the oil tank return oil pipe, and the pressure of the relief valve is 20 bar; the two connection points of the pipelines at both ends of the relief valve connected in parallel to the oil tank return oil pipe are respectively located on both sides of the whole formed by the interface for the mutual rescue return oil pipe and the quick connector on the oil tank return oil pipe.

[0015] Further, let the oil return protection hydraulic system and the equipment to be mutually rescued be the rescued party and the rescuer party respectively:

[0016] When performing rescue operations on the rescued party, the rescuer and the rescued party are connected through the mutual rescue pipeline; the fuel tank of the rescuer provides hydraulic oil for the rescued party, and the hydraulic oil in the actuator of the rescued party then flows back into the fuel tank of the rescuer.

[0017] After the rescue of the rescued party is completed and the rescued party resumes normal working conditions, the oil return pipeline of the rescued party is connected, the power take-off takes power normally, the fuel tank of the rescued party provides hydraulic oil for the rescued party, and the hydraulic oil in the actuator of the rescued party smoothly flows back into the fuel tank of the rescued party.

[0018] Beneficial effects:

[0019] (1) A kind of oil return protection hydraulic system with mutual rescue function proposed by the present invention can, after the mutual rescue work between the rescued party and the rescuer is completed, when the oil return protection device on the oil return pipeline of the rescued party is forgotten to be opened, the hydraulic system cannot take power or after the hydraulic system takes power normally, the hydraulic oil in the oil return pipeline can normally return to the fuel tank, thus avoiding the situation that the oil return pipeline is blocked and the continuous supply of oil by the hydraulic system will damage the multi-way valve tail plate and other hydraulic components.

[0020] (2) For a kind of oil return protection hydraulic system with mutual rescue function provided by the present invention, the oil return protection device adopts a manual ball valve. If the manual ball valve is forgotten to be opened, the oil return pipeline of the rescued party is disconnected. If there is no air hole A on the manual ball valve, the oil pump can continue to work and pump oil, and the oil pressure in the system of the rescued party will increase, causing potential safety hazards; therefore, the present invention is provided with an air hole A on the manual ball valve, so that while the oil return pipeline of the rescued party is disconnected, the power take-off air pipeline of the rescued party is blocked, the power take-off of the rescued party cannot take power, and the oil pump of the rescued party cannot work, preventing the oil pressure in the system of the rescued party from increasing.

[0021] (3) For a kind of oil return protection hydraulic system with mutual rescue function provided by the present invention, the oil return protection device adopts a two-position two-way solenoid ball valve; if the equipment power supply is forgotten to be energized, the solenoid ball valve is disconnected, that is, the oil return pipeline of the rescued party is disconnected, and at the same time, the power take-off of the rescued party is also powered off and does not work, and the oil pump of the rescued party cannot work, preventing the oil pressure in the system of the rescued party from increasing.

[0022] (4) For a kind of oil return protection hydraulic system with mutual rescue function provided by the present invention, the oil return protection device adopts a relief valve connected in parallel on the fuel tank oil return pipeline. If the interface of the mutual rescue oil return pipeline is forgotten to be docked with the quick connector on the fuel tank oil return pipeline, the pressure in the oil return pipeline will rise. When the pressure in the oil return pipeline reaches 20 bar, the relief valve opens, and the hydraulic oil in the actuator of the rescued party can smoothly flow back into the fuel tank of the rescued party through the relief valve, preventing the oil pressure in the system of the rescued party from increasing. Description of the drawings

[0023] Figure 1 It is the system composition diagram of Embodiment 1;

[0024] Figure 2 It is the connection schematic diagram of the manual ball valve;

[0025] Figure 3 It is Figure 2 the A-A sectional view of;

[0026] Figure 4 It is the system composition diagram of Embodiment 2;

[0027] Figure 5 It is the system composition diagram of Embodiment 3;

[0028] Among them, 1 - manual ball valve, 2 - oil tank, 3 - oil pump, 4 - power take-off, 5 - multi-way valve, 6 - actuator, 7 - equipment air source, 8 - mutual rescue pipeline, 9 - air hole A, 10 - air hole B, 11 - electromagnetic ball valve, 12 - equipment power supply, 13 - unloading valve, 14 - mutual rescue oil inlet pipe interface, 15 - mutual rescue oil return pipe interface, 16 - quick connector. Specific implementation manners

[0029] The present invention will be described in detail below with reference to the accompanying drawings and by way of examples.

[0030] Embodiment 1:

[0031] This embodiment provides a hydraulic system for return oil protection with a mutual rescue function, including: an oil tank 2, an oil pump 3, a power take-off 4, a mutual rescue pipeline 8, a multi-way valve 5, an actuator 6 and a return oil protection device;

[0032] The oil pump 3 is installed on the power take-off 4, and the power take-off 4 is communicated with the equipment air source 7 through an air pipe; the oil inlet pipe of the oil pump 3 is communicated with the oil tank 2, and the oil outlet pipe of the oil pump 3 is connected to an oil inlet of the multi-way valve 5. An oil outlet of the multi-way valve 5 is connected to the oil inlet of the actuator 6, and the oil outlet of the actuator 6 is connected to another oil inlet of the multi-way valve 5. Another oil outlet of the multi-way valve 5 is communicated with the oil tank 2 through an oil return pipe of the oil tank 2;

[0033] The equipment to be mutually rescued is connected to the oil outlet pipe of the oil pump 3 and the oil return pipe of the oil tank 2 through two mutual rescue pipelines 8 respectively by quick connectors 16 provided thereon, so as to realize the connection and communication between the equipment to be mutually rescued and the oil outlet pipe of the oil pump 3 and the oil return pipe of the oil tank 2; among them, the two mutual rescue pipelines 8 are respectively a mutual rescue oil inlet pipe and a mutual rescue oil return pipe;

[0034] The return oil protection device replaces the blocking device in the prior art. The return oil protection device is arranged on the oil return pipe of the oil tank 2 and is located between the connection point between the mutual rescue pipeline 8 and the oil return pipe of the oil tank 2 and the oil tank 2, and is used to control the on-off of the oil return oil path between the actuator 6 and the oil tank 2 and perform return oil protection on the system.

[0035] The oil return protection device of this embodiment adopts a manual ball valve 1. An air hole A9 is machined on the internal ball core of the manual ball valve 1, and two coaxial air holes B10 are respectively machined on two opposite sides of the manual ball valve 1; the two air holes B10 are connected to the air pipes between the power take-off 4 and the equipment air source 7, that is, the air pipe is divided into two sections. One air hole B10 is connected to the equipment air source 7 through a section of air pipe, and the other air hole B10 is connected to the power take-off 4 through another section of air pipe; by rotating the ball core of the manual ball valve 1, the on-off of the power take-off air path between the power take-off 4 and the equipment air source 7 can be realized. That is, when the air hole A9 on the internal ball core of the manual ball valve 1 is coaxially opposite to the two air holes B10, the air hole A9 is communicated with the two air holes B10, and the power take-off air path is communicated. When the air hole A9 on the internal ball core of the manual ball valve 1 forms a 90-degree angle with the axes of the two air holes B10, the power take-off air path is disconnected; and the opening and closing of the power take-off air path are synchronized with the on-off of the oil return oil path, that is, when the power take-off air path is communicated, the oil return oil path is synchronously communicated, and when the power take-off air path is disconnected, the oil return oil path is synchronously disconnected, and the power take-off air path and the oil return oil path do not intersect;

[0036] When the oil return protection hydraulic system of this embodiment is the party being rescued and the equipment to be mutually rescued is the rescuer:

[0037] When performing a rescue operation on the party being rescued, the rescuer and the party being rescued are connected through the mutual rescue pipeline 8, and the manual ball valve 1 of the party being rescued is closed, that is, the oil return oil path of the party being rescued is disconnected, and the power take-off air path of the party being rescued is synchronously disconnected. The power take-off 4 of the party being rescued cannot take power, and the oil pump 3 of the party being rescued cannot work. At this time, the actuator 6 of the party being rescued is communicated with the fuel tank 2 of the rescuer through the mutual rescue pipeline 8. The fuel tank 2 of the rescuer provides hydraulic oil for the party being rescued, and the hydraulic oil in the actuator 6 of the party being rescued flows back into the fuel tank 2 of the rescuer again;

[0038] After the rescue of the party being rescued is completed and the party being rescued resumes its normal working state, the manual ball valve 1 of the party being rescued needs to be opened. The power take-off air path of the party being rescued is communicated, and the power take-off 4 can take power normally. At the same time, the oil return oil path of the party being rescued is communicated, and the hydraulic oil in the actuator 6 of the party being rescued can flow back smoothly into the fuel tank 2 of the party being rescued; at this time, if the manual ball valve 1 is forgotten to be opened, the oil return oil path of the party being rescued is disconnected. If the manual ball valve 1 is not provided with the air hole A9, the oil pump 3 can continue to pump oil, and the oil pressure in the system of the party being rescued will increase, causing a safety hazard; therefore, this embodiment is provided with the air hole A9 on the manual ball valve 1, so that while the oil return oil path of the party being rescued is disconnected, the power take-off air path of the party being rescued is not connected, the power take-off 4 of the party being rescued cannot take power, and the oil pump 3 of the party being rescued cannot work, preventing the oil pressure in the system of the party being rescued from increasing.

[0039] When the oil return protection hydraulic system of this embodiment is the rescuer and the equipment to be mutually rescued is the party being rescued, a manual ball valve 1 is installed on the oil return oil path of the party being rescued, and the opening and closing of the manual ball valve 1 are the same as the above rescue process.

[0040] Embodiment 2:

[0041] Based on Embodiment 1, the oil return protection device in this embodiment adopts a two-position two-way solenoid ball valve 11; the solenoid ball valve 11 is connected to the equipment power supply 12 through an electric wire; the opening and closing of the solenoid ball valve 11 are controlled by controlling the on-off of the solenoid ball valve 11, that is, when the equipment power supply 12 is powered on, the solenoid ball valve 11 is energized and the solenoid ball valve 11 automatically opens, and when the equipment power supply 12 is powered off, the solenoid ball valve 11 is de-energized and the solenoid ball valve 11 automatically closes; and the power take-off 4 is also electrically connected to the equipment power supply 12. After the equipment power supply 12 is powered on, the power take-off 4 can be powered on to work, avoiding the situation where the solenoid ball valve 11 is in the closed state while the power take-off 4 can still work.

[0042] When the oil return protection hydraulic system in this embodiment is the party being rescued and the equipment to be mutually rescued is the rescuer:

[0043] When performing a rescue operation on the party being rescued, the rescuer and the party being rescued are connected through the mutual rescue pipeline 8. The equipment power supply 12 is powered off, the solenoid ball valve 11 is de-energized, and the solenoid ball valve 11 is in the closed position, disconnecting the oil return oil circuit of the party being rescued. At the same time, the power take-off 4 is de-energized and does not work. At this time, the actuator 6 of the party being rescued is connected to the fuel tank 2 of the rescuer through the mutual rescue pipeline 8. The fuel tank 2 of the rescuer provides hydraulic oil for the party being rescued, and the hydraulic oil in the actuator 6 of the party being rescued then flows back into the fuel tank 2 of the rescuer;

[0044] After the rescue of the party being rescued is completed and the party being rescued returns to the normal working state, the equipment power supply 12 of the party being rescued needs to be powered on, the solenoid ball valve 11 is energized, and the solenoid ball valve 11 is in the open position. The oil return oil circuit of the party being rescued is connected. At the same time, the power take-off 4 of the party being rescued is also powered on to work, and the hydraulic oil in the actuator 6 of the party being rescued can flow back smoothly into the fuel tank 2 of the party being rescued; at this time, if the equipment power supply 12 is forgotten to be powered on, the oil return oil circuit of the party being rescued is disconnected, and at the same time, the power take-off 4 of the party being rescued is de-energized and does not work, and the oil pump 3 of the party being rescued cannot work, preventing the oil pressure in the system of the party being rescued from increasing.

[0045] When the oil return protection hydraulic system in this embodiment is the rescuer and the equipment to be mutually rescued is the party being rescued, a solenoid ball valve 11 is installed on the oil return oil circuit of the party being rescued, and the opening and closing of the solenoid ball valve 11 are the same as the above rescue process.

[0046] Embodiment 3:

[0047] Based on Embodiment 1 or Embodiment 2, a mutual rescue inlet pipe interface 14 is further provided on the outlet pipe of the oil pump 3 in this embodiment, and a mutual rescue return pipe interface 15 is further provided on the return pipe of the fuel tank 2;

[0048] When the mutual rescue inlet oil pipe interface 14 is docked with the quick connector 16 on the outlet oil pipe of the oil pump 3, the outlet oil pipe of the oil pump 3 is connected. When the mutual rescue inlet oil pipe interface 14 is disconnected from the quick connector 16 on the outlet oil pipe of the oil pump 3, the outlet oil pipe of the oil pump 3 is disconnected, and the mutual rescue inlet oil pipe interface 14 is connected to the equipment to be mutually rescued through the mutual rescue inlet oil pipe;

[0049] When the mutual rescue return oil pipe interface 15 is docked with the quick connector 16 on the return oil pipe of the fuel tank 2, the return oil pipe of the fuel tank 2 is connected. When the mutual rescue return oil pipe interface 15 is disconnected from the quick connector 16 on the return oil pipe of the fuel tank 2, the return oil pipe of the fuel tank 2 is disconnected, and the mutual rescue return oil pipe interface 15 is connected to the equipment to be mutually rescued through the mutual rescue return oil pipe;

[0050] The oil return protection device of this embodiment adopts a pressure relief valve connected in parallel to the return oil pipe of the fuel tank 2, and the pressure of the pressure relief valve is 20 bar; the two connection points where the pipelines at both ends of the pressure relief valve are connected in parallel to the return oil pipe of the fuel tank 2 are respectively located on both sides of the whole formed by the mutual rescue return oil pipe interface 15 and the quick connector 16 on the return oil pipe of the fuel tank 2;

[0051] When the oil return protection hydraulic system of this embodiment is the rescued party and the equipment to be mutually rescued is the rescuer:

[0052] When performing a rescue operation on the rescued party, disconnect the mutual rescue inlet oil pipe interface 14 on the rescued party from the quick connector 16 on the outlet oil pipe of the oil pump 3, disconnect the mutual rescue return oil pipe interface 15 from the quick connector 16 on the return oil pipe of the fuel tank 2, and connect the mutual rescue pipeline 8 through the mutual rescue inlet oil pipe interface 14 and the mutual rescue return oil pipe interface 15, thereby connecting the rescuer and the rescued party; since there is a pressure relief valve on the rescued party, the pressure resistance for the hydraulic oil in the actuator 6 of the rescued party to flow back into the fuel tank 2 of the rescued party is 20 bar, and there is no pressure resistance for the hydraulic oil in the actuator 6 of the rescued party to flow back into the fuel tank 2 of the rescuer. Therefore, the fuel tank 2 of the rescuer provides hydraulic oil for the rescued party, and the hydraulic oil in the actuator 6 of the rescued party then flows back into the fuel tank 2 of the rescuer;

[0053] After the rescue of the rescued party is completed and the rescued party resumes normal working conditions, it is necessary to dock the mutual rescue inlet oil pipe interface 14 on the rescued party with the quick connector 16 on the outlet oil pipe of the oil pump 3, and dock the mutual rescue return oil pipe interface 15 with the quick connector 16 on the return oil pipe of the fuel tank 2. The oil return oil circuit of the rescued party is connected, the power take-off 4 takes power normally, and the hydraulic oil in the actuator 6 of the rescued party can flow back into the fuel tank 2 of the rescued party smoothly; at this time, if you forget to dock the mutual rescue return oil pipe interface 15 with the quick connector 16 on the return oil pipe of the fuel tank 2, the pressure in the oil return oil circuit will rise. When the pressure in the oil return oil circuit reaches 20 bar, the pressure relief valve 13 opens, and the hydraulic oil in the actuator 6 of the rescued party can flow back into the fuel tank 2 of the rescued party smoothly through the pressure relief valve 13;

[0054] When the oil return protection hydraulic system of this embodiment is the rescuer and the equipment to be mutually rescued is the rescued party, a unloading valve 13 is installed in parallel on the oil return pipeline of the rescued party, and the opening and closing of the unloading valve 13 is the same as the above-mentioned rescue process.

[0055] In summary, the above are only the preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An oil return protection hydraulic system with a mutual rescue function, comprising: Fuel tank, oil pump, power take-off, mutual rescue pipeline, multi-way valve and actuator; the oil pump is installed on the power take-off, and the power take-off is connected to the equipment air source through an air pipe; the oil pump inlet pipe of the oil pump is connected to the fuel tank, the oil pump outlet pipe of the oil pump is connected to the multi-way valve, the multi-way valve is connected to the fuel tank through the fuel tank return pipe, and the multi-way valve and the actuator are connected through an oil pipe; The equipment to be mutually rescued is connected to the quick connectors provided on the oil pump outlet pipe and the fuel tank return pipe through two mutual rescue pipelines. Among them, the two mutual rescue pipelines are respectively the mutual rescue inlet pipe and the mutual rescue return pipe; It is characterized in that the oil return protection hydraulic system further includes an oil return protection device, and the oil return protection device is arranged on the fuel tank return pipe and is located between the connection point between the mutual rescue pipeline and the fuel tank return pipe and the fuel tank, and is used to control the on-off of the oil return oil path between the actuator and the fuel tank and protect the system from oil return; The oil return protection device adopts a manual ball valve. An air hole A is machined on the internal ball core of the manual ball valve, and two coaxial air holes B are respectively machined on two opposite sides of the manual ball valve; one air hole B is connected to the equipment air source through a section of air pipe, and the other air hole B is connected to the power take-off through another section of air pipe; by rotating the ball core of the manual ball valve, the on-off of the power take-off air path between the power take-off and the equipment air source can be realized; when the air hole A on the internal ball core of the manual ball valve is coaxially opposite to the two air holes B, the air hole A is communicated with the two air holes B, and the power take-off air path is communicated. When the air hole A on the internal ball core of the manual ball valve forms a 90-degree angle with the axes of the two air holes B, the power take-off air path is disconnected; and the opening and closing of the power take-off air path are synchronized with the on-off of the oil return oil path. When the power take-off air path is connected, the oil return oil path is synchronously connected. When the power take-off air path is disconnected, the oil return oil path is synchronously disconnected, and the power take-off air path and the oil return oil path do not intersect.

2. The oil return protection hydraulic system with a mutual rescue function according to claim 1, characterized in that, Let the oil return protection hydraulic system and the equipment to be mutually rescued be the rescued party and the rescuer respectively: When performing a rescue operation on the rescued party, the rescuer and the rescued party are connected through the mutual rescue pipeline; the fuel tank of the rescuer provides hydraulic oil for the rescued party, and the hydraulic oil in the actuator of the rescued party then flows back into the fuel tank of the rescuer; After the rescue of the rescued party is completed and the rescued party resumes normal working status, the oil return oil path of the rescued party is connected, the power take-off takes power normally, the fuel tank of the rescued party provides hydraulic oil for the rescued party, and the hydraulic oil in the actuator of the rescued party smoothly flows back into the fuel tank of the rescued party.

3. A return oil protection hydraulic system with a mutual rescue function, comprising: Fuel tank, oil pump, power take-off, mutual rescue pipeline, multi-way valve and actuator; the oil pump is installed on the power take-off, and the power take-off is connected to the equipment air source through an air pipe; the oil pump inlet pipe of the oil pump is connected to the fuel tank, the oil pump outlet pipe of the oil pump is connected to the multi-way valve, the multi-way valve is connected to the fuel tank through the fuel tank return pipe, and the multi-way valve and the actuator are connected through an oil pipe; The equipment to be mutually rescued is connected to the quick connectors provided on the oil pump outlet pipe and the fuel tank return pipe through two mutual rescue pipelines. Among them, the two mutual rescue pipelines are respectively the mutual rescue inlet pipe and the mutual rescue return pipe; It is characterized in that the oil return protection hydraulic system further includes an oil return protection device, which is arranged on the oil tank return pipe and is located between the connection point between the mutual rescue pipeline and the oil tank return pipe and the oil tank, and is used to control the on-off of the oil return oil circuit between the actuator and the oil tank and protect the system against oil return; The oil return protection device adopts a two-position two-way electromagnetic ball valve; the electromagnetic ball valve is connected to the equipment power supply through an electric wire; the opening and closing of the electromagnetic ball valve are controlled by controlling the on-off of the electromagnetic ball valve. After the equipment power supply is powered on, the electromagnetic ball valve is energized and automatically opens. After the equipment power supply is powered off, the electromagnetic ball valve is de-energized and automatically closes; and the power take-off is also electrically connected to the equipment power supply, and the power take-off can be energized and operate only after the equipment power supply is powered on.

4. The oil return protection hydraulic system with mutual rescue function according to claim 3, characterized in that, Let the oil return protection hydraulic system and the equipment to be mutually rescued be the rescued party and the rescuer respectively: When performing a rescue operation on the rescued party, the rescuer and the rescued party are connected through the mutual rescue pipeline; the oil tank of the rescuer provides hydraulic oil for the rescued party, and the hydraulic oil in the actuator of the rescued party then flows back into the oil tank of the rescuer. After the rescue of the rescued party is completed and the rescued party resumes its normal working state, the oil return oil circuit of the rescued party is connected, the power take-off takes power normally, the oil tank of the rescued party provides hydraulic oil for the rescued party, and the hydraulic oil in the actuator of the rescued party smoothly flows back into the oil tank of the rescued party.

5. A return oil protection hydraulic system with a mutual rescue function, comprising: An oil tank, an oil pump, a power take-off, a mutual rescue pipeline, a multi-way valve and an actuator; the oil pump is installed on the power take-off, and the power take-off communicates with the equipment air source through an air pipe; the oil pump inlet pipe of the oil pump communicates with the oil tank, the oil pump outlet pipe of the oil pump is connected to the multi-way valve, the multi-way valve communicates with the oil tank through the oil tank return pipe, and the multi-way valve and the actuator are connected through an oil pipe; The equipment to be mutually rescued is connected to the quick connectors arranged on the oil pump outlet pipe and the oil tank return pipe through two mutual rescue pipelines. Among them, the two mutual rescue pipelines are the mutual rescue inlet pipe and the mutual rescue return pipe respectively; It is characterized in that the oil return protection hydraulic system further includes an oil return protection device, which is arranged on the oil tank return pipe and is located between the connection point between the mutual rescue pipeline and the oil tank return pipe and the oil tank, and is used to control the on-off of the oil return oil circuit between the actuator and the oil tank and protect the system against oil return; An interface for the mutual rescue inlet pipe is further provided on the oil pump outlet pipe, and an interface for the mutual rescue return pipe is further provided on the oil tank return pipe; When the interface for the mutual rescue inlet pipe is docked with the quick connector on the oil pump outlet pipe, the oil pump outlet pipe is connected. When the interface for the mutual rescue inlet pipe is disconnected from the quick connector on the oil pump outlet pipe, the oil pump outlet pipe is disconnected, and the interface for the mutual rescue inlet pipe is connected to the equipment to be mutually rescued through the mutual rescue inlet pipe; When the interface for the mutual rescue return pipe is docked with the quick connector on the oil tank return pipe, the oil tank return pipe is connected. When the interface for the mutual rescue return pipe is disconnected from the quick connector on the oil tank return pipe, the oil tank return pipe is disconnected, and the interface for the mutual rescue return pipe is connected to the equipment to be mutually rescued through the mutual rescue return pipe; The oil return protection device adopts a pressure relief valve connected in parallel to the oil return pipe of the fuel tank, and the pressure of the pressure relief valve is 20 bar; the two connection points where the pipelines at both ends of the pressure relief valve are connected in parallel to the oil return pipe of the fuel tank are respectively located on both sides of the whole formed by the mutual rescue oil return pipe interface and the quick connector on the oil return pipe of the fuel tank.

6. The oil return protection hydraulic system with mutual rescue function according to claim 5, characterized in that, Let the oil return protection hydraulic system and the equipment to be mutually rescued be the rescued party and the rescuer respectively: When carrying out the rescue operation on the rescued party, the rescuer and the rescued party are connected through the mutual rescue pipeline; the fuel tank of the rescuer provides hydraulic oil for the rescued party, and the hydraulic oil in the actuator of the rescued party then flows back into the fuel tank of the rescuer. After the rescue of the rescued party is completed and the rescued party resumes the normal working state, the oil return oil circuit of the rescued party is connected, the power take-off takes power normally, the fuel tank of the rescued party provides hydraulic oil for the rescued party, and the hydraulic oil in the actuator of the rescued party smoothly flows back into the fuel tank of the rescued party.

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