Hydraulic oil tank and working machine

Abstract

The invention relates to the field of hydraulic pressure, and discloses a hydraulic oil tank and an operation machine. The oil return pipeline is used for returning hydraulic oil to the oil tank body; the oil supplementing pipeline is used for supplementing hydraulic oil into the oil tank main body; the oil filtering device is arranged in the oil tank main body and is provided with a return oil filtering inlet, a supplemented oil filtering inlet and a filtering outlet, the return oil filtering inlet is connected with the oil return pipeline, the supplemented oil filtering inlet is connected with the oil supplementing pipeline, and the filtering outlet is communicated with the oil cavity of the oil tank main body. According to the hydraulic oil tank, the oil cleanliness and the pumping efficiency of the pump can be effectively considered, and the production and manufacturing cost can be reduced. In addition, the space occupied by the hydraulic oil tank can be saved, and meanwhile the overall appearance of the hydraulic oil tank can be more compact and attractive.

Description

Technical Field

[0001] The present application belongs to the field of hydraulic technology, and specifically relates to a hydraulic oil tank and an operating machine. Background Art

[0002] In the prior art, hydraulic oil tanks are usually provided with a refueling port for the convenience of refilling oil. However, when refueling, there is a risk of contaminating the oil in the tank. For this reason, an oil outlet filter is generally provided at the oil outlet of the tank to prevent contaminants from flowing with the oil in the hydraulic system. However, when an oil outlet filter is provided, the oil suction resistance of the pump will increase, thereby affecting the pump suction efficiency of the pump. Summary of the invention

[0003] The purpose of the present application is to provide a hydraulic oil tank and an operating machine, which can avoid oil contamination during oil replenishment, reduce the oil suction resistance of the pump, and effectively take into account both the oil cleanliness and the pumping efficiency of the pump.

[0004] In order to achieve the above objectives, the present application provides a hydraulic oil tank, which includes:

[0005] Fuel tank body;

[0006] An oil return pipeline, used for returning hydraulic oil to the oil tank body;

[0007] an oil replenishing pipeline, used for replenishing hydraulic oil into the oil tank body; and

[0008] An oil filter device is arranged in the oil tank body and is provided with a return oil filter inlet, a replenishing oil filter inlet and a filter outlet, the return oil filter inlet is connected to the return oil pipeline, the replenishing oil filter inlet is connected to the replenishing oil pipeline, and the filter outlet is communicated with the oil cavity of the oil tank body.

[0009] In some embodiments, the oil filter device includes a buffer chamber and an oil filter, the oil filter is communicated with the buffer chamber, the oil filter is provided with an oil filter mounting portion connected to one axial end of the buffer chamber and extending into the buffer chamber, the replenishing oil filter inlet is communicated with the other axial end of the buffer chamber, the return oil filter inlet is formed on the peripheral wall of the buffer chamber and is arranged toward the oil filter mounting portion, the inlet of the oil filter is formed on the oil filter mounting portion, and the outlet of the oil filter is formed as the filter outlet.

[0010] In some embodiments, an oil buffer structure is provided on the axial end wall of the oil filter mounting portion facing the oil replenishment filter inlet and / or the peripheral wall facing the oil return filter inlet, and the inlet of the oil filter is formed in the oil buffer structure.

[0011] In some embodiments, the oil buffer structure includes a plurality of oil dispersion ribs arranged in sequence and at intervals on the peripheral wall and / or the axial end wall of the oil filter mounting portion, and the inlet of the oil filter is formed between any two adjacent oil dispersion ribs.

[0012] In some embodiments, the oil filter device comprises a support cover, an oil filter and a sealing assembly, wherein the support cover is embedded in the oil cavity of the oil tank body from the outer wall of the oil tank body, the support cover is provided with an axial outer end cover opening, an axial inner end through hole and a buffer cavity between the axial outer end cover opening and the axial inner end through hole, the sealing assembly seals the axial outer end cover opening, and the oil filter is connected and fixed to the axial inner end through hole;

[0013] Among them, the return oil filter inlet is arranged on the peripheral wall of the support cover and connected to the buffer cavity, the replenishing oil filter inlet is arranged on the sealing assembly and connected to the buffer cavity, the inlet of the oil filter is connected to the buffer cavity, and the outlet of the oil filter is formed as the filter outlet.

[0014] In some embodiments, the oil filter device includes an oil filter and a bypass valve disposed between the oil filter and the oil chamber of the oil tank body, wherein the bypass valve can be opened when the internal pressure of the oil filter is higher than a first preset maximum pressure so that the oil filter can be depressurized through the bypass valve;

[0015] And / or, the hydraulic oil tank comprises a pressure detection device for detecting the internal pressure of the oil filter device, and the pressure detection device can trigger an alarm when the internal pressure of the oil filter device is higher than a second preset maximum pressure.

[0016] In some embodiments, the hydraulic oil tank includes a pressure measuring pipeline connecting the oil filtering device and the pressure detecting device.

[0017] In some embodiments, the hydraulic oil tank includes a temperature detection device for detecting the oil temperature in the oil tank body, and the temperature detection device can trigger an alarm when the oil temperature is higher than a preset maximum oil temperature.

[0018] In some embodiments, the hydraulic oil tank includes a partition that separates an oil return chamber and an oil outlet chamber in the oil chamber of the oil tank body, the partition is provided with a partition oil hole connecting the oil return chamber and the oil outlet chamber, the oil filter device is built into the oil return chamber, and the oil replenishment pipeline and the oil return pipeline are both connected and fixed to the cavity wall of the oil return chamber.

[0019] A second aspect of the present application also provides a working machine, which includes the above-mentioned hydraulic oil tank.

[0020] Through the above technical solution, the hydraulic oil tank of the present application adds an oil replenishment filter inlet to the oil filter device connected to the oil return line, so that the oil replenishment line can be connected to the oil filter device through the oil replenishment filter inlet, so that the hydraulic oil flowing into the oil filter device through the oil replenishment line can further flow into the oil chamber of the oil tank body from the filter outlet after filtering, which can avoid the phenomenon of oil contamination when replenishing oil using the oil replenishment line. In this way, the existing oil outlet filter can be omitted, thereby reducing the oil suction resistance of the pump and eliminating the cost of the oil outlet filter. It can be seen that the hydraulic oil tank of the present application can effectively take into account the cleanliness of the oil and the pump suction efficiency of the pump, and can reduce the production cost.

[0021] In addition, the oil filter device of the hydraulic oil tank of the present application is arranged inside the oil tank body. Compared with the hydraulic oil tank in the prior art in which the return oil filter is arranged outside the oil tank body, the hydraulic oil tank of the present application can save the space occupied by itself, and the overall appearance of the hydraulic oil tank can be more compact and beautiful.

[0022] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without creative work. In the drawings:

[0024] Figure 1 It is a main perspective view of a hydraulic oil tank in a specific embodiment of the present application;

[0025] Figure 2 for Figure 1 Side perspective view of the hydraulic oil tank in.

[0026] Description of Reference Numerals

[0027] 1 Oil outlet pipeline 2 Oil tank body

[0028] 3 Air filter 4 Oil outlet cavity

[0029] 5 Partition plate 6 Oil return line

[0030] 7 Oil return port 8 Oil return chamber

[0031] 9 Sealing assembly 10 Support cover

[0032] 11 Oil filter 12 Oil supply line

[0033] 13 Oil filling port 14 Pressure measuring line

[0034] 15 Pressure detection device 16 Temperature detection device

[0035] 51 Partition oil hole 52 Partition cleaning port

[0036] 111 Bypass valve DETAILED DESCRIPTION

[0037] The specific implementation of the present application is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present application, and is not used to limit the present application.

[0038] Reference Figure 1 and Figure 2 The first exemplary embodiment of the present application provides a hydraulic oil tank, the hydraulic oil tank comprising:

[0039] Fuel tank body 2;

[0040] An oil return line 6, used for returning hydraulic oil to the oil tank body 2;

[0041] An oil replenishing pipeline 12, used to replenish hydraulic oil into the oil tank body 2; and

[0042] The oil filter device is provided with a return oil filter inlet, a replenishing oil filter inlet and a filter outlet. The return oil filter inlet is connected to the return oil pipeline 6, the replenishing oil filter inlet is connected to the replenishing oil pipeline 12, and the filter outlet is connected to the oil cavity of the oil tank body 2.

[0043] Through the above-mentioned arrangement, the hydraulic oil tank of the present application adds an oil replenishment filter inlet on the oil filter device connected to the oil return line 6, so that the oil replenishment line 12 can be connected to the oil filter device through the oil replenishment filter inlet, so that the hydraulic oil flowing into the oil filter device through the oil replenishment port 13 of the oil replenishment line 12 can further flow into the oil chamber of the oil tank body 2 from the filter outlet after filtering, which can avoid the phenomenon of oil contamination when using the oil replenishment line 12 to replenish oil. In this way, the existing oil outlet filter can be omitted, thereby reducing the oil suction resistance of the pump and eliminating the cost of the oil outlet filter.

[0044] It can be seen that the hydraulic oil tank of the present application can effectively take into account both the cleanliness of the oil and the pumping efficiency of the pump, and can reduce the production cost.

[0045] It should be noted that the hydraulic oil flowing into the oil filter device through the oil return port 7 of the oil return line 6 can also flow into the oil chamber of the oil tank body 2 from the filter outlet after filtration, thereby avoiding oil contamination when returning oil using the oil return line 6.

[0046] In some embodiments, the oil filter device is arranged in the oil tank body 2. Compared with the hydraulic oil tank in the prior art in which the return oil filter is arranged outside the oil tank body, the hydraulic oil tank of the present application can save the space occupied by itself, and the overall appearance of the hydraulic oil tank can be more compact and beautiful.

[0047] In some embodiments, the oil filter device may include a buffer chamber and an oil filter 11. Specifically, the oil filter 11 is in communication with the buffer chamber, and the oil filter 11 is provided with an oil filter mounting portion connected to one axial end of the buffer chamber and extending into the buffer chamber, while the oil replenishment filter inlet is in communication with the other axial end of the buffer chamber. In addition, the return oil filter inlet is formed on the peripheral wall of the buffer chamber and is arranged toward the oil filter mounting portion, the inlet of the oil filter 11 is formed on the oil filter mounting portion, and the outlet of the oil filter 11 is formed as the above-mentioned filter outlet of the filter device.

[0048] Through the arrangement of this embodiment, since the buffer chamber has a certain volume, the buffer chamber can accommodate the oil flowing in from the return oil line 6 or the replenishing oil line 12, and play a buffering role on the oil. The oil in the buffer chamber can further flow into the oil filter 11 through the oil filter inlet at the oil filter mounting portion. Under the buffering effect of the buffer chamber, the flow rate of the oil flowing into the oil filter 11 is relatively stable, which is conducive to more fully filtering the impurities in the oil and improving the filtering effect. The speed of the oil discharged from the oil filter outlet to the oil chamber of the oil tank body 2 is also slowed down, reducing the turbulence caused by the impact of the oil and reducing the fluctuation of the impurities deposited in the oil chamber of the oil tank body 2, thereby effectively maintaining the cleanliness of the oil in the hydraulic oil tank and extending the service life of the oil.

[0049] In some embodiments, an oil buffer structure is provided on the axial end wall of the oil filter mounting portion facing the oil replenishment filter inlet and / or the peripheral wall facing the oil return filter inlet, and in this case, the inlet of the oil filter 11 is formed in the oil buffer structure. With such a configuration, when the oil in the buffer cavity flows to the inlet of the oil filter 11, the oil buffer structure can further slow down the flow speed of the oil, thereby further enhancing the buffer effect and preventing the oil from heating up due to impact.

[0050] In some embodiments, the oil buffer structure may include a plurality of oil dispersion ribs sequentially arranged at intervals on the peripheral wall and / or the axial end wall of the oil filter mounting portion, and in this case, the inlet of the oil filter 11 is formed between any two adjacent oil dispersion ribs. When the oil in the buffer cavity flows through the plurality of oil dispersion ribs of the oil buffer structure, the plurality of oil dispersion ribs can appropriately disperse the oil and slow down the flow rate of the oil, thereby achieving the above-mentioned effect of enhancing the buffer and preventing the oil from heating up due to impact.

[0051] Of course, the present application does not limit the specific structural form of the oil buffer structure. In addition to the multiple oil dispersion ribs mentioned above, the oil buffer structure can also be other structural forms such as a mesh plate, multiple oil baffles arranged in a staggered manner to form a circuitous oil channel, etc.

[0052] In some embodiments, the oil filter device includes a support cover 10, an oil filter 11 and a sealing assembly 9. Specifically, the support cover 10 is embedded in the oil cavity of the oil tank body 2 from the outer wall of the oil tank body 2, and the support cover 10 is provided with an axial outer end cover opening, an axial inner end through hole and a buffer cavity located between the axial outer end cover opening and the axial inner end through hole. In addition, the sealing assembly 9 seals the axial outer end cover opening of the support cover 10, and the oil filter 11 is connected and fixed to the axial inner end through hole of the support cover 10 (for example, the oil filter 11 is connected and fixed to the axial inner end through hole of the support cover 10 through the aforementioned oil filter mounting portion), so that the oil filter 11 is arranged in the oil cavity of the oil tank body 2. At this time, the return oil filter inlet can be set on the peripheral wall of the support cover 10 and connected to the buffer cavity, the replenishing oil filter inlet can be set on the sealing assembly 9 and connected to the buffer cavity, the inlet of the oil filter 11 can be connected to the buffer cavity, and the outlet of the oil filter 11 can be formed as a filter outlet.

[0053] Through the arrangement of this embodiment, the support cover 10 can be used to support the oil filter 11, so that the oil filter 11 is arranged in the oil cavity of the oil tank body 2, thereby achieving the aforementioned effect of saving the space occupied by the hydraulic oil tank itself and making the overall appearance of the hydraulic oil tank more compact and beautiful.

[0054] In addition, the buffer chamber in the support cover 10 has a certain volume, so the buffer chamber can accommodate the oil flowing in from the return oil line 6 or the replenishing oil line 12, and play a buffering role on the oil, so that the flow rate of the oil flowing into the oil filter 11 is relatively stable, which is conducive to more fully filtering the impurities in the oil and improving the filtering effect. It also slows down the speed at which the oil filter 11 discharges the oil into the oil chamber of the oil tank body 2, reduces the turbulence caused by the impact of the oil, and reduces the fluctuation of impurities deposited in the oil chamber of the oil tank body 2, thereby effectively maintaining the cleanliness of the oil in the hydraulic oil tank and extending the service life of the oil.

[0055] By setting the sealing component 9, the axial outer end cover opening of the support cover 10 can be sealed to prevent external impurities from entering the cover cavity from the axial outer end cover opening of the support cover 10 and causing the impurities to subsequently clog the oil filter 11, thereby ensuring that the oil filter 11 can be used for a long time and reducing the frequency of replacement or cleaning.

[0056] In some embodiments, the oil filter device includes an oil filter 11 and a bypass valve 111 disposed between the oil filter 11 and the oil chamber of the oil tank body 2. When there are too many impurities accumulated in the oil filter 11 and a blockage occurs, the internal pressure of the oil filter 11 will increase. For this reason, the present embodiment is configured such that when the internal pressure of the oil filter 11 is higher than the first preset maximum pressure, the bypass valve 111 can be switched from a closed state to an open state, so that the oil filter 11 can bypass the pressure oil in its filter element to the oil chamber of the oil tank body 2 through the bypass valve 111, thereby achieving pressure relief of the oil filter 11 and avoiding damage to the oil filter 11 and the hydraulic oil tank due to excessive pressure.

[0057] In some embodiments, the hydraulic oil tank includes a pressure detection device 15 for detecting the internal pressure of the oil filter device. When too many impurities accumulate in the oil filter 11 and blockage occurs, the internal pressure of the oil filter 11 will increase. For this reason, this embodiment is configured so that the pressure detection device 15 can trigger an alarm when it detects that the internal pressure of the oil filter device is higher than a second preset maximum pressure.

[0058] For example, the pressure detection device 15 can feed back the detection signal to the controller of the operating machine. When the controller determines that the internal pressure of the oil filter device is higher than the second preset maximum pressure, it can control the alarm device in the operating machine to send out an alarm signal (sound, image, etc.), thereby promptly reminding the operator to replace the filter element of the oil filter device. Alternatively, the communication of the controller can be omitted, and the pressure detection device 15 can be directly communicated with the alarm device, so that the pressure detection device 15 directly triggers the alarm device to send out an alarm signal.

[0059] In some embodiments, the hydraulic oil tank includes a pressure measuring line 14 connecting the oil filter device and the pressure detection device 15, that is, at this time, the pressure detection device 15 can obtain internal pressure feedback of the oil filter device through the pressure measuring line 14, thereby obtaining real-time pressure information.

[0060] In some embodiments, the hydraulic oil tank includes a temperature detection device 16 for detecting the oil temperature in the tank body 2. In this embodiment, the temperature detection device 16 can trigger an alarm when it detects that the oil temperature in the tank body 2 is higher than a preset maximum oil temperature.

[0061] For example, the temperature detection device 16 can feed back the detection signal to the controller of the operating machine. When the controller determines that the oil temperature in the oil tank body 2 is higher than the preset maximum oil temperature, it can control the alarm device in the operating machine to send out an alarm signal (sound, image, etc.), thereby promptly reminding the operator to stop the machine for inspection. Alternatively, the communication of the controller can be omitted, and the temperature detection device 16 can be directly communicated with the alarm device, so that the temperature detection device 16 directly triggers the alarm device to send out an alarm signal.

[0062] In some embodiments, the hydraulic oil tank includes a partition plate 5 for separating the oil return chamber 8 and the oil outlet chamber 4 in the oil chamber of the oil tank body 2, and the partition plate 5 is provided with a partition plate oil hole 51 connecting the oil return chamber 8 and the oil outlet chamber 4. In addition, the oil filter device is built into the oil return chamber 8, and the oil replenishment pipeline 12 and the oil return pipeline 6 are both connected and fixed to the cavity wall of the oil return chamber 8.

[0063] With such arrangement, when the oil in the oil replenishment line 12 or the oil return line 6 flows into the oil filter device, the oil filter device can discharge the filtered oil into the oil return chamber 8, and the oil in the oil return chamber 8 can flow into the oil outlet chamber 4 through the partition oil hole 51. Usually, the cavity wall of the oil outlet chamber 4 is also provided with an oil outlet, and the oil outlet is connected to the oil inlet of the hydraulic pump through the oil outlet pipeline 1. When the hydraulic pump is running, under the pumping action of the pump, the oil in the oil outlet chamber 4 can flow into the hydraulic pump through the oil outlet pipeline 1. In this embodiment, by providing the partition 5, it is beneficial to the precipitation of impurities in the oil return chamber 8, so that the impurities in the oil return chamber 8 are not easy to flow into the oil outlet chamber 4 with the oil, and the risk of impurities flowing with the oil in the hydraulic system is further reduced.

[0064] In some embodiments, the outer wall of the oil tank body 2 is also provided with a main body cleaning port connected to the oil outlet chamber 4, and the partition 5 is also provided with a partition cleaning port 52 that can connect the return oil chamber 8 and the oil outlet chamber 4. If the oil chamber of the oil tank body 2 is to be cleaned, the inside of the oil outlet chamber 4 can be cleaned through the main body cleaning port. In addition, the return oil chamber 8 can also be cleaned through the main body cleaning port and the partition cleaning port 52.

[0065] Further, refer to Figure 2 The partition oil hole 51 can be set below the partition cleaning port 52. Usually, the oil outlet of the oil outlet chamber 4 is set at the bottom of the hydraulic oil tank. Therefore, the partition oil hole 51 is set below the partition cleaning port 52. The distance between the partition oil hole 51 and the oil outlet can be shortened, which makes it easier for the oil in the return oil chamber 8 to flow to the oil outlet faster after passing through the partition oil hole 51.

[0066] In addition, the partition oil hole 51 can be set as a rectangular hole (or other shapes) and set at the corner of the partition 5, so that the partition oil hole 51 can be defined by the partition 5 and the tank wall of the oil tank body 2. Furthermore, the partition cleaning port 52 can be set as a waist-shaped hole (or other shapes) and set in the middle area of ​​the partition 5, which is more convenient for cleaning the oil outlet chamber 4 and the oil return chamber 8 when cleaning the oil chamber of the hydraulic oil tank.

[0067] In some embodiments, an outer wall of the oil tank body 2 is provided with a mounting hole, in which an air filter device 3 is installed. The air filter device 3 can purify the air when the oil tank body 2 exchanges air with the outside, and filter out impurities in the air to prevent impurities in the air from entering the oil cavity of the oil tank body 2, which is beneficial to extending the service life of the hydraulic oil.

[0068] In addition, the second exemplary embodiment of the present application also provides a working machine, which includes the above-mentioned hydraulic oil tank. The hydraulic system in the working machine is usually also provided with a hydraulic pump connected to the hydraulic oil tank, and the hydraulic pump can be driven by different types of power sources.

[0069] For example, the working machinery of the present application may be a fuel-powered machinery, including tractors, automobiles, automobile cranes, truck cranes, mixer trucks, pump trucks, fire trucks, road construction vehicles, sanitation vehicles, etc. whose hydraulic pumps are driven by fuel engines, but are not limited to these.

[0070] The operating machinery of the present application may also be a new energy machinery, including but not limited to new energy tractors, new energy vehicles, new energy vehicle cranes, new energy truck cranes, new energy mixer trucks, new energy pump trucks, new energy fire trucks, new energy road construction vehicles, new energy sanitation vehicles, etc. The new energy machinery can be driven by a power battery to drive a motor, and then the motor drives a hydraulic pump to operate, so that the hydraulic pump pumps oil from a hydraulic oil tank.

[0071] In some embodiments, the hydraulic oil tank includes a pressure detection device 15 for detecting the internal pressure of the oil filter device, and the working machine includes an alarm device that communicates with the pressure detection device 15. As mentioned above, the alarm device can send an alarm signal when the pressure detection device 15 detects that the internal pressure of the oil filter device is higher than the second preset maximum pressure, which will not be repeated here.

[0072] In some embodiments, the hydraulic oil tank includes a temperature detection device 16 for detecting the oil temperature in the oil tank body 2, and the working machine includes an alarm device that communicates with the temperature detection device 16. As mentioned above, the alarm device can send an alarm signal when the temperature detection device 16 detects that the oil temperature is higher than the preset maximum oil temperature, which will not be repeated here.

[0073] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0074] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0075] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0076] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. Hydraulic oil tank, characterized in that: include: Fuel tank body (2); An oil return pipeline (6) for returning hydraulic oil to the oil tank body (2); An oil replenishing pipeline (12) for replenishing hydraulic oil into the oil tank body (2); and An oil filter device is arranged in the oil tank body (2) and is provided with a return oil filter inlet, a replenishing oil filter inlet and a filter outlet, the return oil filter inlet is connected to the return oil pipeline (6), the replenishing oil filter inlet is connected to the replenishing oil pipeline (12), and the filter outlet is communicated with the oil chamber of the oil tank body (2).

2. The hydraulic oil tank according to claim 1, characterized in that: The oil filter device comprises a buffer chamber and an oil filter (11), the oil filter (11) being in communication with the buffer chamber, the oil filter (11) being provided with an oil filter mounting portion connected to one axial end of the buffer chamber and extending into the buffer chamber, the replenishing oil filter inlet being in communication with the other axial end of the buffer chamber, the returning oil filter inlet being formed on a peripheral wall of the buffer chamber and arranged toward the oil filter mounting portion, the inlet of the oil filter (11) being formed on the oil filter mounting portion, and the outlet of the oil filter (11) being formed as the filter outlet.

3. The hydraulic oil tank according to claim 2, characterized in that: An oil buffer structure is provided on the axial end wall of the oil filter mounting portion facing the oil replenishment filter inlet and / or the peripheral wall facing the oil return filter inlet, and the inlet of the oil filter (11) is formed in the oil buffer structure.

4. The hydraulic oil tank according to claim 3, characterized in that: The oil buffer structure comprises a plurality of oil dispersing ribs which are sequentially arranged at intervals on the peripheral wall and / or the axial end wall of the oil filter mounting portion, and the inlet of the oil filter (11) is formed between any two adjacent oil dispersing ribs.

5. The hydraulic oil tank according to claim 1, characterized in that: The oil filter device comprises a support cover (10), an oil filter (11) and a sealing assembly (9); the support cover (10) is embedded in the oil cavity of the oil tank body (2) from the outer wall of the oil tank body (2); the support cover (10) is provided with an axial outer cover opening, an axial inner through hole and a buffer cavity between the axial outer cover opening and the axial inner through hole; the sealing assembly (9) seals the axial outer cover opening; the oil filter (11) is connected and fixed to the axial inner through hole; The return oil filter inlet is arranged on the peripheral wall of the support cover (10) and is connected to the buffer chamber, the replenishing oil filter inlet is arranged on the sealing assembly (9) and is connected to the buffer chamber, the inlet of the oil filter (11) is connected to the buffer chamber, and the outlet of the oil filter (11) is formed as the filter outlet.

6. The hydraulic oil tank according to claim 1, characterized in that: The oil filter device comprises an oil filter (11) and a bypass valve (111) arranged between the oil filter (11) and the oil chamber of the oil tank body (2); the bypass valve (111) can be opened when the internal pressure of the oil filter (11) is higher than a first preset maximum pressure so that the oil filter (11) can release pressure through the bypass valve (111); And / or, the hydraulic oil tank comprises a pressure detection device (15) for detecting the internal pressure of the oil filter device, and the pressure detection device (15) can trigger an alarm when the internal pressure of the oil filter device is higher than a second preset maximum pressure.

7. The hydraulic oil tank according to claim 6, characterized in that: The hydraulic oil tank comprises a pressure measuring pipeline (14) connecting the oil filter device and the pressure detection device (15).

8. The hydraulic oil tank according to claim 1, characterized in that: The hydraulic oil tank comprises a temperature detection device (16) for detecting the oil temperature in the oil tank body (2), and the temperature detection device (16) can trigger an alarm when the oil temperature is higher than a preset maximum oil temperature.

9. The hydraulic oil tank according to claim 1, characterized in that: The hydraulic oil tank comprises a partition (5) for separating an oil return chamber (8) and an oil outlet chamber (4) in the oil chamber of the oil tank body (2); the partition (5) is provided with a partition oil hole (51) for connecting the oil return chamber (8) and the oil outlet chamber (4); the oil filter device is built into the oil return chamber (8); and the oil replenishment pipeline (12) and the oil return pipeline (6) are both connected and fixed to the cavity wall of the oil return chamber (8).

10. An operating machine, characterized in that: Comprising a hydraulic oil tank according to any one of claims 1 to 9.

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