Excavator oil tank heating system and excavator

Abstract

The excavator oil tank heating system comprises an engine, a main oil tank, an auxiliary oil tank, a valve and a heater, the engine is provided with a first oil inlet, a first oil outlet, a first water inlet and a first water outlet, the auxiliary oil tank is provided with a third oil inlet and a third oil outlet, and the third oil inlet is communicated with the first oil inlet through a pipeline. The third oil outlet is communicated with the first oil outlet through a pipeline, the heater is arranged in the main oil tank and provided with a second water inlet and a second water outlet, the second water inlet is communicated with the first water inlet through a pipeline, and the second water outlet is communicated with the first water outlet through a pipeline. -35 # diesel oil in the auxiliary oil tank flows to the first oil inlet through the third oil outlet and then enters and starts the engine, in the operation process of the engine, cooling liquid of the engine flows into the heater, and the heater heats 0 # diesel oil in the main oil tank in the main oil tank.

Description

Technical Field

[0001] The utility model relates to the technical field of excavators, in particular to an excavator oil tank heating system and an excavator. Background Art

[0002] Construction machinery operating in extremely cold regions, such as excavators, often requires -35 diesel to ensure proper startup and continued operation. This is because -35 diesel has a lower freezing point, allowing it to remain liquid in extremely low temperatures, ensuring smooth engine startup and stable operation. However, the cost of this specialized diesel is significantly higher than conventional 0 diesel.

[0003] When No. 0 diesel fuel freezes, operators often have to resort to temporary measures, such as pouring hot water or roasting it over a fire, to thaw the tank. These methods are not only inefficient but also pose safety risks, easily causing equipment damage or fire accidents. Utility Model Content

[0004] In order to overcome at least one defect of the above-mentioned prior art, the present invention provides an excavator fuel tank heating system and an excavator, which can solve the problem of low efficiency and low safety of the thawing process of No. 0 diesel after it is frozen in an extremely cold environment.

[0005] The technical solution adopted by the present invention to solve the problem is:

[0006] An excavator oil tank heating system, comprising:

[0007] an engine, the engine having a first oil inlet, a first oil outlet, a first water inlet, and a first water outlet;

[0008] a main oil tank, the main oil tank having a second oil inlet and a second oil outlet, the second oil inlet being connected to the first oil outlet via a pipeline, and the second oil outlet being connected to the first oil inlet via a pipeline;

[0009] an auxiliary oil tank, the auxiliary oil tank having a third oil inlet and a third oil outlet, the third oil inlet being connected to the first oil outlet via a pipeline, and the third oil outlet being connected to the first oil inlet via a pipeline;

[0010] The valve includes a first valve and a second valve, the first valve being provided on the pipeline between the second oil inlet and the first oil outlet, or the first valve being provided on the pipeline between the second oil outlet and the first oil inlet; the second valve being provided on the pipeline between the third oil inlet and the first oil outlet, or the second valve being provided on the pipeline between the third oil outlet and the first oil inlet;

[0011] A heater is provided in the main oil tank, and the heater has a second water inlet and a second water outlet, the second water inlet is connected to the first water outlet through a pipeline, and the second water outlet is connected to the first water inlet through a pipeline.

[0012] By adopting the above scheme, after the No. 0 diesel in the main tank is frozen, the No. -35 diesel in the auxiliary tank is used to flow through the third oil outlet to the first oil inlet and then enter and start the engine. During the operation of the engine, the pure water or antifreeze in the engine used to cool the engine will flow out through the first water outlet with heat and flow into the heater. The heater is in the main tank. When the pure water or antifreeze with more heat flows in the heater, the heat is transferred to the frozen No. 0 diesel in the main tank through the heater. After the heat is output, the pure water or antifreeze flows through the second water outlet to the first water inlet and then flows into the engine, bringing the heat from the engine to the main tank, thus cyclically heating the No. 0 diesel in the main tank. The auxiliary tank and heater cooperate with the engine's cooling system to thaw the No. 0 diesel in the main tank, avoiding the safety hazards caused by using temporary thawing methods (such as pouring hot water or roasting with fire). The safety performance of the system is improved, ensuring the safety of equipment and operators.

[0013] Furthermore, it also includes an air conditioner, which has a third water inlet and a third water outlet, the third water inlet is connected to the first water outlet through a pipe, the third water outlet is connected to the first water inlet through a pipe, the second water inlet is connected to the pipe between the third water inlet and the first water outlet through a pipe, and the second water outlet is connected to the pipe between the third water outlet and the first water inlet through a pipe.

[0014] By adopting this solution, the traditional engine liquid cooling system is connected to the air conditioning system, utilizing the heat generated by the engine during operation. Furthermore, the second water inlet is connected via a pipe to the pipe between the third water inlet and the first water outlet, and the second water outlet is connected via a pipe to the pipe between the third water outlet and the first water inlet. This is equivalent to connecting a heater in parallel to the traditional piping, partially diverting the coolant to heat the No. 0 diesel in the main tank. This approach greatly reduces the design difficulty and the difficulty of modifying existing excavators, fully utilizing the existing piping layout, and improving the overall energy efficiency of the system.

[0015] Furthermore, the valve also includes a third valve, which is arranged on the pipeline from the second water inlet to the third water inlet and the first water outlet, or the third valve is arranged on the pipeline from the second water outlet to the third water outlet and the first water inlet.

[0016] By adopting the above solution, the third valve is installed on the pipe between the second water inlet and the third water inlet and the first water outlet, or on the pipe between the second water outlet and the third water outlet and the first water inlet. This design allows the system to more flexibly control the direction and flow of the coolant. Depending on the type of third valve selected, it can control whether the pure water or coolant exchanged between the air conditioner and the engine flows into the heater, and when it does flow into the heater, the specific diversion ratio, ensuring efficient use of engine waste heat under different operating conditions.

[0017] Furthermore, the third valve is a ball valve.

[0018] By adopting the above solution, the internal flow channel design of the ball valve reduces the resistance when the fluid passes through, reduces the pressure loss of the coolant in the pipeline, and improves the overall energy efficiency of the system.

[0019] Furthermore, the ball valve is an electromagnetic ball valve.

[0020] By adopting the above solution, the excavator can be controlled through the on-board controller, and there is no need to manually open and close the ball valve, which improves convenience.

[0021] Furthermore, the valve also includes a fourth valve and a fifth valve, and the fourth valve and the fifth valve are both three-way valves, the first water inlet, the second water outlet and the third water outlet are respectively connected to the three interfaces of the fourth valve, and the first water outlet, the second water inlet and the third water inlet are respectively connected to the three interfaces of the fifth valve.

[0022] Furthermore, the fourth valve is an electromagnetic three-way valve, for switching the first water inlet to be connected to the second water outlet, or the first water inlet to be connected to the third water outlet, or the first water inlet, the second water outlet and the third water outlet to be connected;

[0023] The fifth valve is an electromagnetic three-way valve for switching the first water outlet to be connected to the second water inlet, or the first water outlet to be connected to the third water inlet, or the first water outlet, the second water inlet and the third water inlet to be connected.

[0024] Furthermore, the first valve and the second valve are both three-way valves, the first oil inlet, the second oil outlet and the third oil outlet are respectively connected to the three interfaces of the first valve, and the first oil outlet, the second oil inlet and the third oil inlet are respectively connected to the three interfaces of the second valve.

[0025] Furthermore, the first valve is an electromagnetic three-way valve for switching the first oil inlet to be connected to the second oil outlet and the first oil inlet to be connected to the third oil outlet;

[0026] The second valve is an electromagnetic three-way valve for switching the first oil outlet to be connected to the second oil inlet and the first oil outlet to be connected to the third oil inlet.

[0027] The utility model also provides an excavator, comprising the above-mentioned excavator oil tank heating system.

[0028] In summary, the excavator oil tank heating system provided by the present invention has the following technical effects:

[0029] After the No. 0 diesel in the main tank freezes, the No. -35 diesel in the auxiliary tank flows through the third outlet to the first inlet, where it enters and starts the engine. While the engine is running, pure water or antifreeze, used to cool the engine, carries heat with it through the first outlet and into the heater. The heater is located in the main tank. As the heat-carrying pure water or antifreeze flows through the heater, it transfers heat to the frozen No. 0 diesel in the main tank. After the heat is transferred, the pure water or antifreeze flows through the second outlet to the first inlet, then into the engine, transferring heat from the engine to the main tank, thus heating the No. 0 diesel in the main tank. The auxiliary tank and heater work in conjunction with the engine's cooling system to thaw the No. 0 diesel in the main tank, eliminating the safety hazards associated with temporary thawing methods (such as pouring hot water or heating). This improves the safety performance of the system and ensures the safety of both equipment and operators. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the first pipeline connection method of the utility model;

[0031] Figure 2 This is a schematic diagram of the second pipeline connection method of the present invention.

[0032] Among them, the meanings of the figure marks are as follows: 1. Engine; 11. First oil inlet; 12. First oil outlet; 13. First water inlet; 14. First water outlet; 2. Main fuel tank; 21. Second oil inlet; 22. Second oil outlet; 3. Auxiliary fuel tank; 31. Third oil inlet; 32. Third oil outlet; 41. First valve; 42. Second valve; 43. Third valve; 44. Fourth valve; 45. Fifth valve; 5. Heater; 51. Second water inlet; 52. Second water outlet; 6. Air conditioner; 61. Third water inlet; 62. Third water outlet. DETAILED DESCRIPTION

[0033] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described and discussed below in conjunction with the drawings of the present invention. Obviously, what is described here is only a part of the examples of the present invention, not all the examples. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] In order to facilitate the understanding of the embodiments of the present invention, the following will be further explained with reference to specific embodiments as examples in conjunction with the drawings, and each embodiment does not constitute a limitation on the embodiments of the present invention.

[0035] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions 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 direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0037] See Figure 1The utility model discloses an excavator oil tank heating system, comprising an engine 1, a main oil tank 2, an auxiliary oil tank 3, a valve, and a heater 5. The engine 1 has a first oil inlet 11, a first oil outlet 12, a first water inlet 13, and a first water outlet 14. The main oil tank 2 has a second oil inlet 21 and a second oil outlet 22. The second oil inlet 21 is connected to the first oil outlet 12 through a pipeline, and the second oil outlet 22 is connected to the first oil inlet 11 through a pipeline. The auxiliary oil tank 3 has a third oil inlet 31 and a third oil outlet 32. The third oil inlet 31 is connected to the first oil outlet 12 through a pipeline, and the third oil outlet 32 ​​is connected to the first oil inlet 11 through a pipeline. The valves include a first valve 41 and a second valve 42. The first valve 41 is provided on the pipeline between the second oil inlet 21 and the first oil outlet 12, or the first valve 41 is provided on the pipeline between the second oil outlet 22 and the first oil inlet 11. The second valve 42 is provided on the pipeline between the third oil inlet 31 and the first oil outlet 12, or the second valve 42 is provided on the pipeline between the third oil outlet 32 ​​and the first oil inlet 11. The heater 5 is provided in the main oil tank 2. The heater 5 has a second water inlet 51 and a second water outlet 52. The second water inlet 51 is connected to the first water outlet 14 via a pipeline, and the second water outlet 52 is connected to the first water inlet 13 via a pipeline.

[0038] Specifically, the engine 1 has a first oil inlet 11 for oil intake, a first oil outlet 12 for oil discharge, a first water inlet 13 for coolant or pure water to flow in, and a first water outlet 14 for coolant or pure water to flow out. Coolant and pure water are hereinafter referred to as coolant. The main oil tank 2 has a second oil inlet 21 for oil intake and a second oil outlet 22 for oil discharge. The second oil inlet 21 is connected to the first oil inlet 11 through a pipeline, and the second oil outlet 22 is connected to the first oil inlet 11 through a pipeline. The first oil outlet 12 and the second oil inlet 21 are connected by a pipeline, and the first oil inlet 11 and the second oil outlet 22 are connected by a pipeline, thereby forming an oil circuit from the engine 1 to the main oil tank 2. Specifically, the oil in the main oil tank 2 flows back to the main oil tank 2 after passing through the second oil outlet 22, the first oil inlet 11, the first oil outlet 12, and the second oil inlet 21 in sequence. The auxiliary fuel tank 3 has a third fuel inlet 31 and a third fuel outlet 32. The third fuel inlet 31 is connected to the first fuel outlet 12 via a pipeline, and the third fuel outlet 32 ​​is connected to the first fuel inlet 11 via a pipeline, thereby forming an oil circuit between the engine 1 and the auxiliary fuel tank 3. Specifically, the oil in the auxiliary fuel tank 3 flows back to the auxiliary fuel tank 3 through the third fuel outlet 32, the first fuel inlet 11, the first fuel outlet 12, and the third fuel inlet 31. The valves include a first valve 41 and a second valve 42. The first valve 41 is located in the pipeline between the second fuel inlet 21 and the first fuel outlet 12, or between the second fuel outlet 22 and the first fuel inlet 11. In other words, the first valve 41 is located in the pipeline between the second fuel inlet 21 and the first fuel outlet 12, or between the second fuel outlet 22 and the first fuel inlet 11, to control the oil circuit between the engine 1 and the main fuel tank 2. The second valve 42 is arranged on the pipeline between the third oil inlet 31 and the first oil outlet 12, or the second valve 42 is arranged on the pipeline between the third oil outlet 32 ​​and the first oil outlet 12, that is, the second valve 42 is arranged on the pipeline between the third oil inlet 31 and the first oil outlet 12 or the pipeline between the third oil outlet 32 ​​and the first oil inlet 11 to control the on-off of the oil circuit between the engine 1 and the auxiliary tank 3. The heater 5 is arranged in the main fuel tank 2. The heater 5 has a second water inlet 51 and a second water outlet 52. The second water inlet 51 is connected to the first water outlet 14 through a pipeline, and the second water outlet 52 is connected to the first water inlet 13 through a pipeline, that is, a water circuit is formed. Specifically, the coolant in the engine 1 flows through the first water outlet 14, the second water inlet 51, the second water outlet 52, and the first water inlet 13 in turn and flows back to the engine 1. When the coolant flows through the second water inlet 51 and the second water outlet 52, the heat carried in the coolant is transferred to the No. 0 diesel in the main fuel tank 2 through the heater 5 with high thermal conductivity, thereby completing the thawing of the No. 0 diesel.

[0039] The heater 5 may be a heat-conducting structure having a coil structure.

[0040] The working principle of the above structure is: after the No. 0 diesel in the main tank 2 is frozen, the No. -35 diesel in the auxiliary tank 3 is used to flow to the first oil inlet 11 through the third oil outlet 32 ​​and then enter and start the engine 1. During the operation of the engine 1, the pure water or antifreeze in the engine 1 used to cool the engine 1 will flow out through the first water outlet 14 with heat and flow into the heater 5. The heater 5 is in the main tank 2. When the pure water or antifreeze with more heat flows in the heater 5, the heat is transferred to the frozen No. 0 diesel in the main tank 2 through the heater 5. After the heat is output, the pure water or antifreeze flows to the first water inlet 13 through the second water outlet 52, and then flows into the engine 1, and then brings the heat in the engine 1 to the main tank 2, so that the No. 0 diesel in the main tank 2 is heated in a cycle. The auxiliary fuel tank 3 and heater 5 work in conjunction with the engine 1's cooling system to thaw the No. 0 diesel fuel in the main fuel tank 2, avoiding the safety hazards associated with temporary thawing methods (such as pouring hot water or roasting). This improves the system's safety performance and ensures the safety of both equipment and operators.

[0041] In some embodiments, the excavator oil tank heating system also includes an air conditioner 6, which has a third water inlet 61 and a third water outlet 62. The third water inlet 61 is connected to the first water outlet 14 through a pipe, and the third water outlet 62 is connected to the first water inlet 13 through a pipe. The second water inlet 51 is connected to the pipe between the third water inlet 61 and the first water outlet 14 through a pipe, and the second water outlet 52 is connected to the pipe between the third water outlet 62 and the first water inlet 13 through a pipe.

[0042] Specifically, the traditional engine 1 liquid cooling system is already connected to the air conditioning system 6, utilizing the heat generated by the engine 1 during operation. On this basis, the second water inlet 51 is connected to the pipe between the third water inlet 61 and the first water outlet 14 through a pipe, and the second water outlet 52 is connected to the pipe between the third water outlet 62 and the first water inlet 13 through a pipe. In this way, it is equivalent to connecting a heater 5 in parallel in the traditional pipeline to divert part of the coolant to complete the heating of the No. 0 diesel in the main tank 2. This method greatly reduces the design difficulty and the difficulty of modifying existing excavators, fully utilizes the existing pipeline layout, and improves the overall energy efficiency of the system.

[0043] In some embodiments, the valve also includes a third valve 43, which is arranged on the pipeline between the second water inlet 51 to the third water inlet 61 and the first water outlet 14, or the third valve 43 is arranged on the pipeline between the second water outlet 52 to the third water outlet 62 and the first water inlet 13.

[0044] Specifically, the third valve 43 is disposed on the pipeline between the second water inlet 51, the third water inlet 61, and the first water outlet 14, or on the pipeline between the second water outlet 52, the third water outlet 62, and the first water inlet 13. This design allows the system to more flexibly control the direction and flow rate of the coolant. Depending on the type of third valve 43 selected, it can control whether the pure water or coolant exchanged between the air conditioner 6 and the engine 1 flows into the heater 5, and when it flows into the heater 5, the specific diversion flow ratio can be controlled, ensuring efficient utilization of the waste heat of the engine 1 under different operating conditions.

[0045] In some embodiments, the third valve 43 is a ball valve.

[0046] Specifically, the internal flow channel design of the ball valve reduces the resistance when the fluid passes through, reduces the pressure loss of the coolant in the pipeline, and improves the overall energy efficiency of the system.

[0047] In some embodiments, the ball valve is a solenoid ball valve.

[0048] Specifically, it can be controlled through the excavator's on-board controller, eliminating the need for manual opening and closing of the ball valve, thereby improving convenience.

[0049] In some embodiments, the valve also includes a fourth valve 44 and a fifth valve 45, and the fourth valve 44 and the fifth valve 45 are both three-way valves. The first water inlet 13, the second water outlet 52 and the third water outlet 62 are respectively connected to the three interfaces of the fourth valve 44, and the first water outlet 14, the second water inlet 51 and the third water inlet 61 are respectively connected to the three interfaces of the fifth valve 45.

[0050] Specifically, the fourth valve 44 is a three-way valve, which facilitates the connection between the first water inlet 13, the second water outlet 52 and the third water outlet 62 through the pipeline; the fifth valve 45 is a three-way valve, which facilitates the connection between the first water outlet 14, the second water inlet 51 and the third water inlet 61 through the pipeline.

[0051] Furthermore, the fourth valve 44 is an electromagnetic three-way valve for switching the first water inlet 13 to be connected to the second water outlet 52, or the first water inlet 13 to be connected to the third water inlet, or the first water inlet 13, the second water outlet 52 and the third water outlet 62 to be connected;

[0052] The fifth valve 45 is an electromagnetic three-way valve for switching the first water outlet 14 to communicate with the second water inlet 51 , or the first water outlet 14 to communicate with the third water inlet 61 , or the first water outlet 14 , the second water inlet 51 and the third water inlet 61 .

[0053] Specifically, both the fourth valve 44 and the fifth valve 45 are electromagnetic three-way valves, allowing for greater flexibility in the flow of coolant. The fourth valve 44 controls the flow of coolant between the first water inlet 13, the second water outlet 52, and the third water outlet 62, while the fifth valve 45 controls the flow of coolant between the first water outlet 14, the second water inlet 51, and the third water inlet 61. This design ensures that the system can efficiently utilize the waste heat of the engine 1 under different operating conditions.

[0054] When the diesel in main tank 2 needs to be quickly heated, fourth valve 44 is adjusted to connect first water inlet 13 with second water outlet 52, and fifth valve 45 is adjusted to connect first water outlet 14 with second water inlet 51. This allows engine 1 coolant to circulate only between heater 5 and engine 1, improving heating efficiency and accelerating thawing of the diesel in main tank 2.

[0055] When both heating the diesel in main tank 2 and operating air conditioner 6 are required, fourth valve 44 is adjusted to connect first water inlet 13, second water outlet 52, and third water outlet 62. Fifth valve 45 is adjusted to connect first water outlet 14, second water inlet 51, and third water inlet 61. This allows the coolant, having absorbed excess heat from engine 1, to flow to heater 5, heating the diesel in main tank 2, and to air conditioner 6, heating the system, achieving multifunctional operation.

[0056] When heating of the diesel in main fuel tank 2 is not required, fourth valve 44 is adjusted to connect first water inlet 13 and third water outlet 62, and fifth valve 45 is adjusted to connect first water outlet 14 and third water inlet 61. In this way, the coolant from engine 1 circulates only between air conditioner 6 and engine 1. The air conditioner 6 system cools the coolant, ensuring cab comfort while reducing unnecessary heat waste and improving energy efficiency.

[0057] The electromagnetic three-way valve can realize automatic operation and automatically adjust the valve's switch state through the control system, reducing manual intervention and improving the system's operational convenience and efficiency.

[0058] See Figure 2 As shown, in some embodiments, the first valve 41 and the second valve 42 are both three-way valves, the first oil inlet 11, the second oil outlet 22 and the third oil outlet 32 ​​are respectively connected to the three interfaces of the first valve 41, and the first oil outlet 12, the second oil inlet 21 and the third oil inlet 31 are respectively connected to the three interfaces of the second valve 42.

[0059] Specifically, when the No. 0 diesel fuel in the main fuel tank 2 freezes, the first valve 41 is adjusted to connect the first fuel inlet 11 with the third fuel outlet 32, and the second valve 42 is adjusted to connect the first fuel outlet 12 with the third fuel inlet 31. This allows the engine 1 to draw No. -35 diesel fuel from the auxiliary fuel tank 3 and return it to the auxiliary fuel tank 3, starting and preheating the engine 1. This design ensures rapid engine starting in extreme cold conditions, preventing starting failures caused by freezing No. 0 diesel fuel in the main fuel tank 2.

[0060] After the engine 1 is started and preheated, the first valve 41 is adjusted to connect the first fuel inlet 11 with the second fuel outlet 22, and the second valve 42 is adjusted to connect the first fuel outlet 12 with the second fuel inlet 21. In this way, the engine 1 draws No. 0 diesel from the main fuel tank 2 and returns it to the main fuel tank 2, thereby allowing the use of lower-cost No. 0 diesel in extremely cold environments.

[0061] Furthermore, the first valve 41 is an electromagnetic three-way valve for switching the communication between the first oil inlet 11 and the second oil outlet 22 and the communication between the first oil inlet 11 and the third oil outlet 32;

[0062] The second valve 42 is an electromagnetic three-way valve for switching the first oil outlet 12 to communicate with the second oil inlet 21 and the first oil outlet 12 to communicate with the third oil inlet 31 .

[0063] Specifically, by switching the electromagnetic three-way valve, the switching of diesel between the main fuel tank 2 and the auxiliary fuel tank 3 can be accurately controlled, ensuring that the oil circuit can be quickly switched when needed, thereby improving the response speed and operation accuracy of the system.

[0064] The utility model also provides an excavator, comprising the above-mentioned excavator oil tank heating system.

[0065] The technical means disclosed in the present invention are not limited to those disclosed in the above-mentioned embodiments, but also include technical solutions composed of any combination of the above-mentioned technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. An excavator oil tank heating system, characterized in that: include: An engine (1), the engine (1) having a first oil inlet (11), a first oil outlet (12), a first water inlet (13) and a first water outlet (14); A main oil tank (2), the main oil tank (2) having a second oil inlet (21) and a second oil outlet (22), the second oil inlet (21) being in communication with the first oil outlet (12) via a pipeline, and the second oil outlet (22) being in communication with the first oil inlet (11) via a pipeline; A subsidiary oil tank (3), the subsidiary oil tank (3) having a third oil inlet (31) and a third oil outlet (32), the third oil inlet (31) being in communication with the first oil outlet (12) via a pipeline, and the third oil outlet (32) being in communication with the first oil inlet (11) via a pipeline; A valve, comprising a first valve (41) and a second valve (42), wherein the first valve (41) is arranged on a pipeline between the second oil inlet (21) and the first oil outlet (12), or the first valve (41) is arranged on a pipeline between the second oil outlet (22) and the first oil inlet (11); the second valve (42) is arranged on a pipeline between the third oil inlet (31) and the first oil outlet (12), or the second valve (42) is arranged on a pipeline between the third oil outlet (32) and the first oil inlet (11); A heater (5) is provided in the main oil tank (2), and the heater (5) has a second water inlet (51) and a second water outlet (52), wherein the second water inlet (51) is connected to the first water outlet (14) through a pipeline, and the second water outlet (52) is connected to the first water inlet (13) through a pipeline.

2. The excavator oil tank heating system according to claim 1, characterized in that: The air conditioner (6) further comprises an air conditioner (6), wherein the air conditioner (6) has a third water inlet (61) and a third water outlet (62), wherein the third water inlet (61) is connected to the first water outlet (14) through a pipeline, and the third water outlet (62) is connected to the first water inlet (13) through a pipeline, and the second water inlet (51) is connected to the pipeline between the third water inlet (61) and the first water outlet (14) through a pipeline, and the second water outlet (52) is connected to the pipeline between the third water outlet (62) and the first water inlet (13) through a pipeline.

3. The excavator oil tank heating system according to claim 2, characterized in that: The valve further comprises a third valve (43), wherein the third valve (43) is arranged on a pipeline between the second water inlet (51) and the third water inlet (61) and the first water outlet (14), or the third valve (43) is arranged on a pipeline between the second water outlet (52) and the third water outlet (62) and the first water inlet (13).

4. The excavator oil tank heating system according to claim 3, characterized in that: The third valve (43) is a ball valve.

5. The excavator oil tank heating system according to claim 4, characterized in that: The ball valve is an electromagnetic ball valve.

6. The excavator oil tank heating system according to claim 2, characterized in that: The valve further comprises a fourth valve (44) and a fifth valve (45), wherein the fourth valve (44) and the fifth valve (45) are both three-way valves, wherein the first water inlet (13), the second water outlet (52) and the third water outlet (62) are respectively connected to the three interfaces of the fourth valve (44), and the first water outlet (14), the second water inlet (51) and the third water inlet (61) are respectively connected to the three interfaces of the fifth valve (45).

7. The excavator oil tank heating system according to claim 6, characterized in that: The fourth valve (44) is an electromagnetic three-way valve for switching the first water inlet (13) to be in communication with the second water outlet (52), or the first water inlet (13) to be in communication with the third water outlet (62), or the first water inlet (13), the second water outlet (52) and the third water outlet (62); The fifth valve (45) is an electromagnetic three-way valve for switching the first water outlet (14) to be connected to the second water inlet (51), or the first water outlet (14) to be connected to the third water inlet (61), or the first water outlet (14), the second water inlet (51) and the third water inlet (61).

8. The excavator oil tank heating system according to any one of claims 1 to 7, characterized in that: The first valve (41) and the second valve (42) are both three-way valves, the first oil inlet (11), the second oil outlet (22) and the third oil outlet (32) are respectively connected to the three interfaces of the first valve (41), and the first oil outlet (12), the second oil inlet (21) and the third oil inlet (31) are respectively connected to the three interfaces of the second valve (42).

9. The excavator oil tank heating system according to claim 8, characterized in that: The first valve (41) is an electromagnetic three-way valve for switching the first oil inlet (11) to communicate with the second oil outlet (22) and the first oil inlet (11) to communicate with the third oil outlet (32); The second valve (42) is an electromagnetic three-way valve for switching the first oil outlet (12) to be connected to the second oil inlet (21) and the first oil outlet (12) to be connected to the third oil inlet (31).

10. An excavator, characterized in that: The invention comprises the excavator oil tank heating system according to any one of claims 1 to 9.

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