Hydraulic oil source system and hydraulic oil filtering method

Abstract

A hydraulic oil source system and a hydraulic oil filtering method belong to the technical field of hydraulic oil sources, the hydraulic oil source comprises a hydraulic oil source and a working system, the hydraulic oil source comprises an oil tank, an oil supply mechanism and a return oil filtering mechanism, a partition plate is fixedly arranged in the oil tank and divides the interior of the oil tank into a clean oil cavity and a dirty oil cavity, and the clean oil cavity is connected with the working system through the oil supply mechanism; the dirty oil cavity is connected with the clean oil cavity through the oil return filtering mechanism, the dirty oil cavity is connected with the working system through the oil return pipeline, the clean oil cavity and the dirty oil cavity in the oil tank are isolated, pollutants in the dirty oil cavity are effectively isolated, it is guaranteed that hydraulic oil in the clean oil cavity is always in high cleanliness, and the abrasion rate of an oil supply pump set and the blocking rate of a valve set are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic oil sources, and in particular to a hydraulic oil source system and a hydraulic oil filtering method. Background Art

[0002] The hydraulic oil source is composed of a motor, a hydraulic pump, an oil tank, an oil filter, a control valve, etc., which can effectively supply the flow and pressure required by the system's actuators. The hydraulic oil source has been widely used in the electric power, light industry, metallurgy, locomotive, materials and other industries. After the hydraulic oil source provides flow and pressure to the actuators, it will cause hydraulic oil pollution in the actuators. During the long-term recycling process, pollutants will continue to accumulate in the hydraulic oil, and long-term use will cause damage to the actuators.

[0003] At present, a hydraulic oil source system for filtering hydraulic oil has appeared (such as publication number CN116464681A), which is equipped with an oil tank, an oil inlet assembly, an actuator and an oil return assembly to form an oil circuit circulation. A double-cylinder high-pressure filter is provided in the oil inlet assembly to achieve filtering during the oil inlet process; an oil return filter is provided in the oil return assembly to filter the hydraulic oil after use by the actuator, thereby achieving double filtration in the oil circuit circulation to ensure that pollutants are filtered out of the hydraulic oil.

[0004] The existing hydraulic oil source system utilizes a partition filter device to divide the interior of the oil tank into an oil suction area and an oil return area. The partition filter device is similar to a filter plate structure, and the oil suction area and the oil return area are connected. Pollutants in the oil return area that cannot be filtered by the partition filter device will enter the oil suction area, which can easily cause the hydraulic oil in the oil suction area to be contaminated, increasing the wear rate of the oil supply pump group and the probability of valve clogging. In addition, bubbles are easily generated during the oil return process, and the bubbles will enter the oil return pump group and the oil suction area, thereby causing cavitation damage to components such as the oil supply pump group and the oil return pump group. Summary of the invention

[0005] In order to solve the technical problem that the existing hydraulic oil source system in the above-mentioned background technology has pollutants in the oil return area of ​​the oil tank easily flows into the oil suction area, causing hydraulic oil contamination in the oil suction area and increasing the wear of the oil supply pump group, the present invention provides a hydraulic oil source system and a hydraulic oil filtering method.

[0006] The technical solution of the present invention is as follows:

[0007] The present invention provides a hydraulic oil source system, including: a hydraulic oil source and a working system. The hydraulic oil source includes: an oil tank, an oil supply mechanism and an oil return filter mechanism. A partition is fixedly arranged in the oil tank, and the partition divides the inside of the oil tank into a clean oil chamber and a dirty oil chamber. The clean oil chamber is connected to the working system through the oil supply mechanism, and the dirty oil chamber is connected to the clean oil chamber through the oil return filter mechanism. The dirty oil chamber is connected to the working system through the oil return pipeline, and the clean oil chamber and the dirty oil chamber in the oil tank are isolated, and the pollutants in the dirty oil chamber are effectively isolated, so as to ensure that the hydraulic oil in the clean oil chamber is always in a high cleanliness, and reduce the wear rate of the oil supply pump group and the blockage rate of the valve group.

[0008] Preferably, an overflow port is provided at the upper edge of the partition, the clean oil chamber and the dirty oil chamber are connected through the overflow port, the oil supply mechanism includes an oil supply pump group, and the return oil filter mechanism includes a circulating pump group, the flow rate of the circulating pump group is greater than the flow rate of the oil supply pump group, the circulating pump group is connected to the clean oil chamber through an oil delivery pipeline, and a filter is provided on the oil delivery pipeline. The liquid level in the clean oil chamber is always higher than that in the dirty oil chamber. When the liquid level in the clean oil chamber is at the same height as the overflow port, the excess hydraulic oil in the clean oil chamber will flow back into the dirty oil chamber, so that the amount of clean hydraulic oil in the clean oil chamber always meets the needs of the working system. At the same time, contaminants in the dirty oil chamber are prevented from flowing into the clean oil chamber through the overflow port, thereby effectively isolating the contaminants in the dirty oil chamber and ensuring that the hydraulic oil in the clean oil chamber is always at a high degree of cleanliness.

[0009] Preferably, a first buffer mechanism is fixedly provided in the clean oil chamber, and the first buffer mechanism includes a barrel-shaped oil receiving part, two oil guiding parts are relatively fixedly provided on both sides of the oil receiving part, the oil receiving part is located directly below the pipe mouth of the oil pipeline, the oil guiding part is an inclined plate structure, the highest end of the oil guiding part is fixedly connected to the upper end of the oil receiving part, and a plurality of buffer plates are fixedly provided on the oil guiding part at intervals along its length direction, and the buffer plates are inclinedly arranged, and baffles are fixedly provided on the sides of the oil receiving part and the oil guiding part, and the hydraulic oil is transported and guided by the first buffer mechanism. During the transportation process, the buffer plates are used to slow down the flow rate of the hydraulic oil, and at the same time assist in the rupture of the bubbles, so as to prevent a large number of bubbles from being generated in the hydraulic oil in the clean oil chamber.

[0010] Preferably, a second buffer mechanism is fixedly provided with an inclined arrangement in the dirty oil chamber, the highest end of the second buffer mechanism is located directly below the overflow port and contacts the lower edge of the overflow port, the lowest end of the second buffer mechanism contacts the bottom of the dirty oil chamber, the main body of the second buffer mechanism is an inclined plate structure, a baffle is fixedly provided on the side of the main body of the second buffer mechanism, and a plurality of inclined buffer plates are fixedly provided at intervals on the surface of the main body of the second buffer mechanism along its length direction, and the second buffer mechanism can be used to slowly guide the overflowing hydraulic oil to the bottom of the dirty oil chamber, thereby eliminating "waterfall-style" oil return, preventing the generation of a large number of bubbles, and avoiding cavitation of the circulating pump.

[0011] Preferably, the return oil circuit of the oil supply pump group is connected to the dirty oil chamber to ensure that all return oil from the oil source system returns to the dirty oil chamber, thereby fully ensuring the cleanliness of the oil in the clean oil chamber.

[0012] Preferably, an oil return area is provided in the dirty oil chamber, and the oil return area is connected to the working system through an oil return pipeline. A plurality of baffles are fixedly provided in the oil return area, and the baffles are staggered to extend the oil return path in the dirty oil chamber so that the bubbles have sufficient time to rise and burst.

[0013] Preferably, the fuel tank is welded from plates, and a groove is provided on the side wall of the fuel tank, which ensures structural strength, reduces the use of profiles and welding workload, improves production efficiency, saves materials, reduces welding volume and welding deformation, and also greatly improves the overall appearance quality.

[0014] The present invention provides a hydraulic oil filtering method, which is as follows:

[0015] The oil supply pump group extracts the clean hydraulic oil in the clean oil chamber and delivers it to the working system. The hydraulic oil used by the working system is delivered to the oil return area through the oil return pipeline. The used hydraulic oil is baffled and guided to flow into the dirty oil chamber through the baffle plate.

[0016] The return oil filter mechanism extracts and filters the hydraulic oil in the dirty oil chamber, and the filtered hydraulic oil is transported to the oil receiving part. When the liquid level of the hydraulic oil in the oil receiving part is flush with the top of the oil receiving part, it is transported to the bottom of the clean oil chamber through the oil guide part.

[0017] Preferably, when the hydraulic oil level in the clean oil chamber is not lower than the overflow port, the hydraulic oil in the clean oil chamber overflows through the overflow port and slowly flows into the dirty oil chamber under the guidance of the second buffer mechanism.

[0018] Preferably, the oil supply pump assembly returns oil to the dirty oil chamber.

[0019] It can be seen from the above technical solutions that the advantages of the present invention are:

[0020] 1. Isolate the clean oil chamber and dirty oil chamber in the oil tank, effectively isolate the pollutants in the dirty oil chamber, ensure that the hydraulic oil in the clean oil chamber is always at a high degree of cleanliness, and reduce the wear rate of the oil supply pump group and the blockage rate of the valve group.

[0021] 2. The flow rate of the circulating pump group is greater than the flow rate of the oil supply pump group. The circulating pump group is connected to the clean oil chamber through an oil pipeline. A filter is provided on the oil pipeline. The liquid level in the clean oil chamber is always higher than that in the dirty oil chamber. When the liquid level in the clean oil chamber is equal to the overflow port, the excess hydraulic oil in the clean oil chamber will flow back into the dirty oil chamber, so that the amount of clean hydraulic oil in the clean oil chamber always meets the needs of the working system. At the same time, it prevents pollutants in the dirty oil chamber from flowing into the clean oil chamber through the overflow port, effectively isolates the pollutants in the dirty oil chamber, and ensures that the hydraulic oil in the clean oil chamber is always at a high degree of cleanliness.

[0022] 3. A first buffer mechanism is arranged in the clean oil chamber, and a second buffer mechanism and an oil return area are arranged in the dirty oil chamber. The first buffer mechanism can be used to buffer and guide the hydraulic oil entering the clean oil chamber to reduce the generation of bubbles, and the second buffer mechanism and the oil return area can be used to buffer and guide the hydraulic oil entering the dirty oil chamber to reduce bubbles and reduce cavitation damage to the oil supply pump group, the circulation pump group, etc.

[0023] 4. The return oil circuit of the oil supply pump group is connected to the dirty oil chamber to ensure that all return oil from the oil source system returns to the dirty oil chamber, fully ensuring the cleanliness of the oil in the clean oil chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0025] Figure 1 It is a schematic structural diagram of a hydraulic oil source according to one or more embodiments of the present invention;

[0026] Figure 2 A schematic diagram of the structure inside a fuel tank according to one or more embodiments of the present invention;

[0027] Figure 3 A schematic diagram of a hydraulic oil flow path of a hydraulic oil source according to one or more embodiments of the present invention;

[0028] The components represented by the reference numerals in the figure are:

[0029] 1. Oil tank; 2. Oil supply pump group; 3. Circulation pump; 4. Filter; 5. Working system; 6. Partition; 7. Overflow port; 81. Oil receiving part; 82. Oil guiding part; 9. Second buffer mechanism; 10. Buffer plate; 11. Clean oil chamber; 12. Dirty oil chamber; 121. Oil return area; 1211. Baffle. DETAILED DESCRIPTION

[0030] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in this specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0031] Example 1

[0032] In a typical embodiment of the present invention, Figure 1-Figure 3 As shown, a hydraulic oil source system is proposed, including: a hydraulic oil source and a working system 5, the hydraulic oil source includes: an oil tank 1, an oil supply mechanism and an oil return filter mechanism, a partition 6 is fixedly provided in the oil tank 1, the partition 6 divides the inside of the oil tank 1 into a clean oil chamber 11 and a dirty oil chamber 12, the clean oil chamber 11 is connected to the oil supply mechanism, the dirty oil chamber 12 is connected to the oil return filter mechanism, and the dirty oil chamber 12 is connected to the clean oil chamber 11 through the oil return filter mechanism, the oil supply mechanism is connected to the execution unit of the working system 5, and can supply the clean hydraulic oil in the clean oil chamber 11 to the execution unit, and the dirty oil chamber 12 in the oil tank 1 is directly connected to the execution unit of the working system 5 through the oil return pipeline to accommodate the dirty oil flowing back.

[0033] Among them, an overflow port 7 is provided on the upper edge of the partition 6, and the clean oil chamber 11 and the dirty oil chamber 12 are connected only through the overflow port 7. The oil supply mechanism and the return oil filter mechanism both contain pump groups. Specifically, the oil supply mechanism contains an oil supply pump group 2, and the return oil filter mechanism contains a circulation pump group. The flow rate of the circulation pump group is greater than the flow rate of the oil supply pump group 2, so that the dirty oil in the dirty oil chamber 12 is filtered by the return oil filter mechanism and then transported to the clean oil chamber 11. Since the flow rate of the circulation pump group is greater than the flow rate of the oil supply pump group 2, the liquid level in the clean oil chamber 11 is always high. In the dirty oil chamber 12, when the liquid level in the clean oil chamber 11 is at the same height as the overflow port 7, the excess hydraulic oil in the clean oil chamber 11 will flow back into the dirty oil chamber 12, so that the amount of clean hydraulic oil in the clean oil chamber 11 can always meet the needs of the working system 5. At the same time, it prevents the pollutants in the dirty oil chamber 12 from flowing into the clean oil chamber 11 through the overflow port 7, effectively isolates the pollutants in the dirty oil chamber 12, ensures that the hydraulic oil in the clean oil chamber 11 is always at a high cleanliness level, and reduces the wear rate of the oil supply pump group 2 and the blockage rate of the valve group.

[0034] The fuel tank 1 is welded from plates, and a groove is provided on the side wall of the fuel tank 1 to improve the shell strength. The plate arc reinforcement structure is adopted to ensure the structural strength, reduce the use of profiles and welding workload, improve production efficiency, save materials, reduce welding volume and welding deformation, and the overall appearance quality is also greatly improved.

[0035] The oil supply pump group 2 includes several motor pumps, which are connected to the working system 5 through an oil supply pipeline. A pressure detection unit is provided on the connecting pipeline between the oil supply pump group 2 and the working system 5, and the pressure detection unit is connected to the PLC to detect the system pressure and pipeline rupture; the motor pump includes a motor, a variable piston pump and a shock absorbing unit. The variable piston pump is connected to the motor through a bell cover and a coupling. The coaxiality of the motor and the variable piston pump is guaranteed by the cooperation of the bell cover and the coupling. The coupling is a plum blossom-shaped coupling. The intermediate elastomer adopts an injection molding process to ensure the strength, wear resistance and elasticity of the elastomer, avoid wear of the motor and the variable piston pump, and ensure the life of the motor and the variable piston pump. The shock absorbing unit is made of polyurethane, arranged at the bottom of the motor and fixed with bolts, so as to be used for shock absorption of the motor pump and improve the service life of the motor pump.

[0036] Since the plunger pump in the motor pump is a constant pressure variable pump, the remote adjustment concept is adopted, and a remote pressure regulating element is added to the oil circuit. The remote pressure regulating element is a combination of a relief valve + a solenoid valve in parallel to achieve pressure-free starting of the motor pump, to prevent the problem of high pressure when the motor starts and large instantaneous current of the motor. The return oil circuit of the oil supply pump group 2 is connected to the dirty oil chamber 12, that is, the return oil of the plunger pump passes through the internal pipeline to the dirty oil chamber 12, to ensure that all return oil of the oil source system returns to the dirty oil chamber 12, to fully ensure the cleanliness of the oil in the clean oil chamber 11.

[0037] The return oil filtering mechanism includes a circulating pump group and a filter 4. The circulating pump group contains a plurality of circulating pumps 3, and each circulating pump 3 is connected to a corresponding filter 4. The circulating pump 3 is connected to the dirty oil chamber 12 through an oil extraction pipeline, and the circulating pump 3 is connected to the clean oil chamber 11 through an oil delivery pipeline. The filter 4 is arranged on the oil delivery pipeline. The circulating pump 3 can extract the dirty oil in the dirty oil chamber 12 and filter it using the filter 4. The filtered clean hydraulic oil is sent back to the clean oil chamber 11 to meet the working needs of the working system 5.

[0038] The filter 4 is composed of a filter body and a pressure differential transmitter, which filters the hydraulic oil of the entire oil source system. If the filter is blocked, the pressure differential transmitter will generate an alarm model to prompt the corresponding personnel to replace the filter element, thereby ensuring the cleanliness of the filter element.

[0039] An oil return area 121 is provided in the dirty oil chamber 12, and the oil return area 121 is communicated with the remaining cavities of the dirty oil chamber 12. The oil return area 121 is located between the remaining cavities of the dirty oil chamber 12 and the oil return port of the dirty oil chamber 12, and the oil return port is connected to the working system 5 through an oil return pipeline. A plurality of baffles 1211 are fixedly provided in the oil return area 121, and the plurality of baffles 1211 are staggered so that the flow path of the visceral oil (i.e., return oil) in the oil return area 121 is a continuous S-shape, so as to extend the flow path and time of the return oil, thereby ensuring that the bubbles in the hydraulic oil have sufficient time to burst, thereby avoiding cavitation of the circulating pump group 3 and the filter 4.

[0040] The circulating pump 3 is connected to the clean oil chamber 11 through an oil delivery pipeline. A first buffer mechanism is fixedly provided in the clean oil chamber 11. The first buffer mechanism is located just below the orifice of the oil delivery pipeline. The first buffer mechanism includes an oil receiving portion 81 and an oil guiding portion 82. Two oil guiding portions 82 are provided. The two oil guiding portions 82 are relatively fixedly arranged on both sides of the oil receiving portion 81. The oil receiving portion 81 is located just below the orifice of the oil delivery pipeline to receive the delivered hydraulic oil. The oil receiving portion 81 is a hollow barrel-shaped structure (either rectangular or cylindrical) with an opening at the top, which is used to receive and contain the hydraulic oil to prevent the bubbles in the delivered hydraulic oil from mixing into the hydraulic oil in the clean oil chamber 11. The oil portion 82 is an inclined plate structure. The highest end of the oil guiding portion 82 is flush with the upper end of the oil receiving portion 81 and is fixedly connected. A plurality of buffer plates 10 are fixedly arranged at intervals along the length direction of the oil guiding portion 82. The buffer plates 10 are arranged obliquely. When the hydraulic oil level in the oil receiving portion 81 is not lower than the upper end height of the oil receiving portion 81, the hydraulic oil in the oil receiving portion 81 flows out of the oil receiving portion 81 and flows to the oil guiding portions 82 on both sides, and is transported to the bottom of the clean oil chamber 11 through the oil guiding portions 82. During the transportation process, the buffer plates 10 are used to slow down the flow rate of the hydraulic oil, and at the same time assist in the rupture of bubbles to prevent a large number of bubbles from being generated in the hydraulic oil in the clean oil chamber 11.

[0041] Baffles are fixedly provided on the sides of the oil receiving portion 81 and the oil guiding portion 82 for shielding and guiding the hydraulic oil, so that the hydraulic oil in the oil receiving portion 81 can accurately flow to the oil guiding portion 82 and flow obliquely downward along the oil guiding portion 82 .

[0042] The portion of the oil delivery pipeline placed in the clean oil chamber 11 can be configured to be bent downward to minimize the distance from the oil receiving portion 81, thereby reducing the drop of the hydraulic oil and reducing the generation of bubbles.

[0043] The connection point between the oil supply pump group 2 and the clean oil chamber 11 is located below the first buffer mechanism, so that the hydraulic oil pumped out by the oil supply pump group 2 is the lowest part in the clean oil chamber 11 (the hydraulic oil bubble content at this position is the least).

[0044] In order to prevent the hydraulic oil overflowing from the overflow port 7 into the dirty oil chamber 12 from freely falling and generating bubbles, a second buffer mechanism 9 is fixedly provided in the dirty oil chamber 12. The main body of the second buffer mechanism 9 is an inclined plate structure. A baffle is fixedly provided on the side of the main body of the second buffer mechanism 9, and a plurality of inclined buffer plates 10 are fixedly provided at intervals on the surface of the main body of the second buffer mechanism 9 along its length direction. The highest end of the second buffer mechanism 9 is located directly below the overflow port 7 and contacts the lower edge of the overflow port 7. The lowest end of the second buffer mechanism 9 contacts the bottom of the dirty oil chamber 12, so that the second buffer mechanism 9 can be used to slowly guide the overflowing hydraulic oil to the bottom of the dirty oil chamber 12, thereby eliminating "waterfall-style" oil return, preventing the generation of a large number of bubbles, and avoiding cavitation of the circulating pump 3.

[0045] A heat exchanger is provided on the top of the oil tank 1, which can ensure the temperature of the oil source system and prevent the alarm shutdown or damage to other hydraulic components caused by excessive temperature.

[0046] In other embodiments, an accumulator may also be provided to reduce shock and replenish pressure for the entire oil source system, eliminate vibration and noise problems of the oil source system, and provide a certain amount of backup energy for the system.

[0047] Example 2

[0048] In another typical embodiment of the present invention, a hydraulic oil filtering method is proposed, which uses the hydraulic oil source system mentioned in Example 1, and is specifically as follows:

[0049] The oil supply pump group 2 works to extract the clean hydraulic oil in the clean oil chamber 11 and transport it to the working system 5 through the oil circuit to provide the execution unit of the working system 5 with work. The hydraulic oil used by the working system 5 is transported to the return oil area 121 in the dirty oil chamber 12 through the return oil pipeline. The used hydraulic oil flows along the S-shaped path through the baffle plate 1211 to extend the flow path and time, so that the hydraulic oil in the return oil area 121 has sufficient time for the bubbles to rise and burst.

[0050] The circulating pump 3 extracts the hydraulic oil in the dirty oil chamber 12, and the filter 4 filters the hydraulic oil extracted from the dirty oil chamber 12, and transmits the filtered hydraulic oil to the clean oil chamber 11 through the oil pipeline. The filtered hydraulic oil is discharged into the oil receiving portion 81 to buffer and isolate the hydraulic oil transmitted. When the liquid level of the hydraulic oil in the oil receiving portion 81 is flush with the top of the oil receiving portion 81, it is transmitted to the bottom of the clean oil chamber 11 through the oil guide portion 82 to prevent the generation of bubbles.

[0051] When the hydraulic oil level in the clean oil chamber 11 is not lower than the overflow port 7, the hydraulic oil in the clean oil chamber 11 overflows through the overflow port 7 and slowly flows into the dirty oil chamber 12 under the guidance of the second buffer mechanism 9 to avoid the generation of bubbles.

[0052] It should be noted that the return oil of the oil supply pump group 2 passes through the internal pipeline to the dirty oil chamber 12 to ensure that all return oil of the oil source system returns to the dirty oil chamber 12, thereby isolating the clean oil chamber 11 from the dirty oil chamber 12 and fully ensuring the cleanliness of the oil in the clean oil chamber 11.

[0053] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hydraulic oil source system, comprising: A hydraulic oil source and a working system (5), characterized in that the hydraulic oil source comprises: an oil tank (1), an oil supply mechanism and an oil return filter mechanism, a partition (6) is fixedly provided inside the oil tank (1), and the partition (6) divides the inside of the oil tank (1) into a clean oil chamber (11) and a dirty oil chamber (12), the clean oil chamber (11) is connected to the working system (5) through the oil supply mechanism, the dirty oil chamber (12) is connected to the clean oil chamber (11) through the oil return filter mechanism, and the dirty oil chamber (12) is connected to the working system (5) through the oil return pipeline.

2. A hydraulic oil source system according to claim 1, characterized in that: An overflow port (7) is provided at the upper edge of the partition (6); the clean oil chamber (11) and the dirty oil chamber (12) are connected via the overflow port (7); the oil supply mechanism comprises an oil supply pump group (2); the return oil filter mechanism comprises a circulation pump group (3); the flow rate of the circulation pump group (3) is greater than the flow rate of the oil supply pump group (2); the circulation pump group (3) is connected to the clean oil chamber (11) via an oil delivery pipeline; and a filter (4) is provided on the oil delivery pipeline.

3. A hydraulic oil source system according to claim 2, characterized in that: A first buffer mechanism is fixedly arranged in the clean oil chamber (11), the first buffer mechanism comprising a barrel-shaped oil receiving portion (81), two oil guiding portions (82) being relatively fixedly arranged on both sides of the oil receiving portion (81), the oil receiving portion (81) being located directly below the pipe opening of the oil delivery pipeline, the oil guiding portion (82) being an inclined plate structure, the highest end of the oil guiding portion (82) being fixedly connected to the upper end of the oil receiving portion (81), a plurality of buffer plates (10) being fixedly arranged at intervals on the oil guiding portion (82) along its length direction, the buffer plates (10) being arranged obliquely, and baffles being fixedly arranged on the sides of the oil receiving portion (81) and the oil guiding portion (82).

4. A hydraulic oil source system according to claim 2, characterized in that: A second buffer mechanism (9) is fixedly provided in an inclined manner in the dirty oil chamber (12); the highest end of the second buffer mechanism (9) is located directly below the overflow port (7) and contacts the lower edge of the overflow port (7); the lowest end of the second buffer mechanism (9) contacts the bottom of the dirty oil chamber (12); the main body of the second buffer mechanism (9) is an inclined plate structure; a baffle is fixedly provided on the side of the main body of the second buffer mechanism (9); and a plurality of inclined buffer plates (10) are fixedly provided on the surface of the main body of the second buffer mechanism (9) at intervals along its length direction.

5. A hydraulic oil source system according to claim 2, characterized in that: The oil return passage of the oil supply pump group (2) is connected to the dirty oil chamber (12).

6. A hydraulic oil source system according to claim 1, characterized in that: An oil return area (121) is provided in the dirty oil chamber (12), and the oil return area (121) is connected to the working system (5) via an oil return pipeline. A plurality of baffles (1211) are fixedly provided in the oil return area (121), and the plurality of baffles (1211) are staggeredly arranged.

7. A hydraulic oil source system according to claim 1, characterized in that: The oil tank (1) is formed by welding plates, and a press groove is provided on the side wall of the oil tank (1).

8. A hydraulic oil filtering method, characterized in that: A hydraulic oil source system according to any one of claims 1 to 7 is used, specifically as follows: The oil supply pump group (2) extracts clean hydraulic oil from the clean oil chamber (11) and delivers it to the working system (5); the hydraulic oil used by the working system (5) is delivered to the oil return area (121) through the oil return pipeline; the used hydraulic oil is deflected and guided by the baffle plate (1211) to flow into the dirty oil chamber (12); The oil return filter mechanism extracts and filters the hydraulic oil in the dirty oil chamber (12), and the filtered hydraulic oil is transported to the oil receiving portion (81). When the liquid level of the hydraulic oil in the oil receiving portion (81) is flush with the top of the oil receiving portion (81), the hydraulic oil is transported to the bottom of the clean oil chamber (11) through the oil guide portion (82).

9. A hydraulic oil filtering method according to claim 8, characterized in that: When the hydraulic oil level in the clean oil chamber (11) is not lower than the overflow port (7), the hydraulic oil in the clean oil chamber (11) overflows through the overflow port (7) and slowly flows into the dirty oil chamber (12) under the guidance of the second buffer mechanism (9).

10. A hydraulic oil filtering method according to claim 8, characterized in that: The oil supply pump group (2) returns oil to the dirty oil chamber (12).

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