Oil return structure of hydraulic oil tank of loading machine

Abstract

The utility model belongs to the field of hydraulic system accessories, and particularly relates to a loading machine hydraulic oil tank oil return structure which comprises an outer bin, an upper cover plate is fixedly installed on the outer bin, supporting blocks are fixedly installed on the upper cover plate through a plurality of nuts, oil suction pipes are fixedly installed between the supporting blocks, a filtering assembly is installed in the outer bin, and the filtering assembly is fixedly installed on the outer bin. The filtering assembly comprises an inner bin, the inner bin is fixedly communicated with the oil suction pipe, the first cavity, the second cavity and the multiple sets of filtering layers are arranged in the inner bin of the filtering assembly, hydraulic oil flows from the first cavity to the second cavity, and the multiple sets of filtering layers are additionally arranged, so that the hydraulic oil is filtered for multiple times; therefore, the hydraulic oil becomes clean after backflow.

Description

Technical Field

[0001] This utility model relates to the technical field of hydraulic system accessories, specifically to a hydraulic oil tank return structure for a loader. Background Technology

[0002] The hydraulic oil tank return structure of a loader typically includes key components such as a return base, return pipe, return tank, baffle, and suction device. These components are connected sequentially to form a complete return system. The working principle of the loader's hydraulic oil tank return structure is mainly based on the natural gravity of the oil and the pressure difference in the hydraulic system. After the oil in the hydraulic system completes the corresponding hydraulic action, it will flow back to the tank using these forces. During the return process, the hydraulic oil passes through the filter element in the return tank for filtration to remove impurities and contaminants.

[0003] Chinese patent (authorization announcement number: CN 219529470 U, authorization announcement date: 2023.08.15) proposes a hydraulic oil tank return oil filter structure. This patent, by setting a self-cleaning mechanism, allows the sliding seat to move by rotating the knob after the return oil filter has been used for a period of time. After the sliding seat moves, the return oil will be stored and continuously accumulated in the outer shell, causing the oil level in the outer shell to rise. Therefore, some of the oil stains adhering to the filter element will also float up with the rise in oil level. After a period of time, a large amount of dirt on the filter element can float on the surface of the oil. At this time, the pipe plug can be opened to allow the dirt and this part of the waste oil to be discharged through the drain pipe. At this time, the filter element completes self-cleaning.

[0004] However, the aforementioned patent only filters the hydraulic oil twice. Too few filtrations will result in unclean hydraulic oil, which will damage the components in the hydraulic system and cause the hydraulic system to malfunction. In order to improve the stability of the hydraulic system, we propose a hydraulic oil tank return structure for loaders. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a hydraulic oil tank return structure for a loader. By setting a first chamber and a second chamber, along with multiple filter layers, within the inner compartment of the filter assembly, the hydraulic oil flows from the first chamber to the second chamber. The multiple filter layers ensure that the hydraulic oil undergoes multiple filtrations, resulting in cleaner hydraulic oil after return flow. This improves the stability of the hydraulic system and solves the problems mentioned earlier.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A hydraulic oil tank return structure for a loader includes an outer compartment with a drain plug fixedly installed on it. A cleaning window is provided on the right side of the outer compartment. An upper cover plate is fixedly installed on the outer compartment, and support blocks are fixedly installed on the upper cover plate by several nuts. An oil suction pipe is fixedly installed between the support blocks. A filter assembly is installed inside the outer compartment, including an inner compartment that is fixedly connected to the oil suction pipe. A first fixed plate, a second fixed plate, and a third fixed plate are fixedly installed inside the inner compartment. A first oil inlet, a second oil inlet, and a third oil inlet are respectively provided on the first, second, and third fixed plates. A first chamber is formed between the first and second fixed plates, and a second chamber is formed between the second and third fixed plates. An oil inlet is provided at the bottom of the inner compartment, and an oil outlet is provided at the top of the inner compartment. A first filter layer, a second filter layer, and a third filter layer are fixedly embedded inside the inner compartment.

[0008] Preferably, an auxiliary slide bar is fixedly installed on the upper cover plate, an auxiliary plate is slidably installed on the auxiliary slide bar, an oil pump is fixedly installed on the auxiliary plate by a nut, a sealing ring is threadedly connected to the oil pump, and the sealing ring is threadedly connected to the oil suction pipe.

[0009] Preferably, a first baffle and a second baffle are fixedly installed inside the outer compartment, and an air filter is fixedly installed on the outer compartment.

[0010] Preferably, the outer compartment is fixedly connected to an oil inlet pipe, and a sealing ring is fixedly connected between the oil inlet pipe and the outer compartment.

[0011] Preferably, a protective cover is fixedly fitted onto the outer surface of the inner compartment.

[0012] Preferably, the first filter layer, the second filter layer, and the third filter layer are all composed of multiple sets of filter materials.

[0013] Beneficial effects

[0014] This utility model provides a hydraulic oil tank return structure for a loader. Compared with the prior art, it has the following advantages:

[0015] 1. The hydraulic oil return structure of the loader hydraulic oil tank, by setting a first chamber and a second chamber and multiple filter layers in the inner compartment of the filter assembly, allows the hydraulic oil to flow from the first chamber to the second chamber. In addition, the multiple filter layers allow the hydraulic oil to undergo multiple filtrations, making the hydraulic oil clean after return, thereby improving the stability of the hydraulic system. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of the present utility model;

[0017] Figure 2This is a schematic diagram of the internal components of the main body of this utility model;

[0018] Figure 3 This is a schematic diagram of some components of the present invention;

[0019] Figure 4 This is a schematic diagram showing the disassembly and assembly of some components of this utility model;

[0020] Figure 5 This is a schematic diagram of the filter assembly of this utility model;

[0021] Figure 6 This is a schematic diagram of the internal components of the inner compartment of this utility model.

[0022] In the diagram: 1. Outer compartment; 2. Drain plug; 3. Cleaning window; 4. Oil inlet pipe; 5. Air filter; 6. First baffle; 7. Second baffle; 8. Filter assembly; 9. Top cover; 10. Oil pump; 11. Auxiliary plate; 12. Sealing ring; 13. Support block; 14. Suction pipe; 15. Protective cover; 16. Inner compartment; 17. Oil outlet; 18. Oil inlet; 20. First oil delivery port; 21. First chamber; 22. Second oil delivery port; 23. Second chamber; 24. Third oil delivery port; 25. First filter layer; 26. Second filter layer; 27. Third filter layer; 28. First fixing plate; 29. ​​Second fixing plate; 30. Third fixing plate; 31. Auxiliary slide bar. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-6This utility model provides a technical solution: a hydraulic oil tank return structure for a loader, including an outer chamber 1, an oil drain plug 2 fixedly installed on the outer chamber 1, a cleaning window 3 opened on the right side of the outer chamber 1, an upper cover plate 9 fixedly installed on the outer chamber 1, support blocks 13 fixedly installed on the upper cover plate 9 by several nuts, an oil suction pipe 14 fixedly installed between the support blocks 13, a filter assembly 8 installed inside the outer chamber 1, the filter assembly 8 including an inner chamber 16, the inner chamber 16 being fixedly connected to the oil suction pipe 14, and a first fixing plate 28 and a second fixing plate fixedly installed inside the inner chamber 16. The first fixed plate 28, the second fixed plate 29 and the third fixed plate 30 are respectively provided with a first oil inlet 20, a second oil inlet 22 and a third oil inlet 24. A first chamber 21 is formed between the first fixed plate 28 and the second fixed plate 29, and a second chamber 23 is formed between the second fixed plate 29 and the third fixed plate 30. An oil inlet 18 is provided at the bottom of the inner chamber 16, and an oil outlet 17 is provided at the upper end of the inner chamber 16. A first filter layer 25, a second filter layer 26 and a third filter layer 27 are fixedly embedded in the inner chamber 16.

[0025] During operation, hydraulic oil enters the inner chamber 16 through the inlet 18, is filtered by the third filter layer 27, and then enters the first chamber 21 through the first oil outlet 20. After being filtered sequentially by the third filter layer 27, the second filter layer 26, and the first filter layer 25, it enters the second chamber 23 through the second oil outlet 22. After being filtered sequentially by the first filter layer 25, the second filter layer 26, and the third filter layer 27, it flows out through the third oil outlet 24 and then enters the suction pipe 14 through the outlet 17.

[0026] An auxiliary slide bar 31 is fixedly installed on the upper cover plate 9. An auxiliary plate 11 is slidably installed on the auxiliary slide bar 31. An oil pump 10 is fixedly installed on the auxiliary plate 11 by a nut. A sealing ring 12 is threadedly connected to the oil pump 10. The sealing ring 12 is threadedly connected to the oil suction pipe 14. When it is necessary to clean the filter assembly 8, first rotate the sealing ring 12 to unscrew the sealing ring 12 from the oil suction pipe 14. Then unscrew the nut on the upper cover plate 9. Then, under the restriction of the auxiliary slide bar 31, slide the oil pump 10 to the right side of the outer chamber 1. Then unscrew the nut on the support block 13 and remove the filter assembly 8, the oil suction pipe 14 and the support block 13 from the outer chamber. Then remove the filter assembly 8 from the oil suction pipe 14. Then the filter assembly 8 can be cleaned.

[0027] The outer chamber 1 is fixedly installed with a first baffle 6 and a second baffle 7, and an air filter 5 is fixedly installed on the outer chamber 1. The first baffle 6 and the second baffle 7 can increase the circulation distance of the hydraulic oil, so that the hydraulic oil has enough time to separate air bubbles and settle impurities.

[0028] The outer chamber 1 is fixedly connected to an oil inlet pipe 4, and a sealing ring is fixedly connected between the oil inlet pipe 4 and the outer chamber 1; hydraulic oil enters the outer chamber 1 from the oil inlet pipe 4.

[0029] A protective cover 15 is fixedly fitted on the outer surface of the inner chamber 16 to prevent damage to the inner chamber 16 and affect the filtration effect.

[0030] The first filter layer 25, the second filter layer 26, and the third filter layer 27 are all composed of multiple sets of filter materials to ensure that the filtered hydraulic oil is absolutely clean.

[0031] Working principle: During use, hydraulic oil enters the outer chamber 1 through the inlet pipe 4. Then, the oil pump 10 is turned on. Under pressure, the hydraulic oil enters the inner chamber 16 through the inlet 18 of the first baffle 6 and the second baffle 7. The first baffle 6 and the second baffle 7 can increase the circulation distance of the hydraulic oil, allowing the hydraulic oil sufficient time to separate air bubbles and settle impurities. After being filtered by the third filter layer 27, it enters the first chamber 21 through the first oil outlet 20. Then, after being filtered by the third filter layer 27, the second filter layer 26 and the first filter layer 25 in sequence, it enters the second chamber 23 through the second oil outlet 22. After being filtered by the first filter layer 25, the second filter layer 26 and the third filter layer 27 in sequence, it flows out through the third oil outlet 24. Then, it enters the suction pipe 14 through the outlet 17. Multiple filtrations can effectively reduce the impurity rate of the hydraulic oil, thereby allowing the hydraulic system to operate stably and improving the stability of the device.

[0032] When cleaning the filter assembly 8 is required, first rotate the sealing ring 12 to unscrew the sealing ring 12 from the oil suction pipe 14. Then, unscrew the nut on the upper cover plate 9. Under the restriction of the auxiliary slide bar 31, slide the oil pump 10 to the right side of the outer chamber 1. Then, unscrew the nut on the support block 13 and remove the filter assembly 8, oil suction pipe 14, and support block 13 from the outer chamber. After that, remove the filter assembly 8 from the oil suction pipe 14. Then you can clean the filter assembly 8.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A loader hydraulic oil tank oil return structure comprising an outer bin (1), characterized in that: The outer bin (1) is fixedly installed with an oil drain plug (2), the right side of the outer bin (1) is provided with a cleaning window (3), the outer bin (1) is fixedly installed with an upper cover plate (9), the upper cover plate (9) is fixedly installed with support blocks (13) through a plurality of nuts, the support blocks (13) are fixedly installed with oil suction pipes (14) therebetween, the outer bin (1) is internally installed with a filter assembly (8), the filter assembly (8) comprises an inner bin (16), the inner bin (16) is fixedly communicated with the oil suction pipes (14), the inner bin (16) is fixedly installed with first, second and third fixed plates (28, 29 and 30), the first, second and third fixed plates (28, 29 and 30) are respectively provided with first, second and third oil outlet ports (20, 22 and 24), the first and second fixed plates (28 and 29) form a first chamber (21) therebetween, the second and third fixed plates (29 and 30) form a second chamber (23) therebetween, the bottom of the inner bin (16) is provided with an oil inlet port (18), the upper end of the inner bin (16) is provided with an oil outlet port (17), and the inner bin (16) is fixedly embedded with first, second and third filter layers (25, 26 and 27).

2. The hydraulic tank return system for a loader as set forth in claim 1, wherein: The upper cover plate (9) is fixedly installed with an auxiliary sliding strip (31), the auxiliary sliding strip (31) is slidingly installed with an auxiliary plate (11), the auxiliary plate (11) is fixedly installed with an oil pump (10) through a nut, and the oil pump (10) is threadedly connected with a sealing ring (12), and the sealing ring (12) is threadedly connected with the oil suction pipe (14).

3. The hydraulic tank return system for a loader as set forth in claim 2, wherein: The outer bin (1) is fixedly installed with first and second baffles (6 and 7), and the outer bin (1) is fixedly installed with an air filter (5).

4. The hydraulic tank return system for a loader as set forth in claim 3, wherein: The outer bin (1) is fixedly communicated with an oil inlet pipe (4), and the oil inlet pipe (4) is fixedly connected with a sealing ring between the outer bin (1).

5. The hydraulic tank return system for a loader as set forth in claim 4, wherein: The outer surface of the inner bin (16) is fixedly sleeved with a protective cover (15).

6. The hydraulic tank return system for a loader as set forth in claim 5, wherein: The first, second and third filter layers (25, 26 and 27) are all composed of a plurality of groups of filter materials.

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