Filtering device for hydraulic oil pump

Abstract

The invention discloses a filtering device for a hydraulic oil pump, which comprises a tubular shell, an end cover, a bracket rotatably arranged in the shell, an adjusting mechanism for driving the bracket to rotate and a plurality of groups of filtering mechanisms, the bracket comprises a pair of rotating ring pieces, a pipe sleeve and a plurality of spacing plates, the partition plates are fixedly attached to the outer wall of the pipe sleeve, the sides, away from the pipe sleeve, of the partition plates are attached to the inner wall of the shell in a sliding contact mode, the number of the partition plates is even, each filtering mechanism is assembled on the pipe sleeve and located between every two adjacent partition plates, and first oil passing through grooves corresponding to the filtering mechanisms are formed in the pipe sleeve in a penetrating mode. The shell is provided with a pair of connecting ports which are uniformly distributed in the circumferential direction, the diameter of each connecting port is smaller than the distance between the two partition plates, the support is rotated, so that the unused filtering mechanism is right opposite to the connecting ports, the used filtering mechanism can be replaced in idle time, normal use is guaranteed, and the replacement error-tolerant rate is also increased.

Description

Technical Field

[0001] The present invention relates to the technical field related to hydraulic oil pump filtration, and in particular to a filtering device for a hydraulic oil pump. Background Art

[0002] The hydraulic oil pump is the power source in the hydraulic system. The hydraulic oil pump we choose must meet the hydraulic system's requirements for pressure and flow. At the same time, we must also fully consider reliability, life, maintainability, etc. so that the selected hydraulic oil pump can operate for a long time in the hydraulic system.

[0003] my country's utility model patent application number CN202222652937.X, "A hydraulic oil pump filtering device", discloses a hydraulic oil pump filtering device, which uses threaded connections between the filter cartridge housing and the observation port, inlet cover and filter assembly parts to facilitate disassembly and assembly of each part, and can conveniently and timely clean the filter device thoroughly, avoiding residue remaining on the inside of the filter device and affecting the filtering effect. The filter assembly's card block is matched and connected with the card groove on the inner side of the filter cartridge housing to facilitate accurate positioning. After the card connection, the internal components are not easy to shift during the filtration process. The filter assembly is used to make the oil undergo triple circulation filtration to remove residue, effectively filtering out impurities in the oil. At the same time, the structure is simple and the production cost is low.

[0004] However, the above device still has the following shortcomings. When the filter is clogged with impurities, the oil flow rate will be reduced, and the filter needs to be cleaned or replaced immediately. However, when working or when there is no free time, the filter cannot be cleaned or replaced immediately, which will affect the normal operation of the hydraulic oil pump. Therefore, it is necessary to design a filtering device for a hydraulic oil pump. Summary of the invention

[0005] In view of the above technical problems, the purpose of the present invention is to overcome the problem in the prior art that the filter device cannot be replaced or cleaned in time, which affects the normal operation of the hydraulic oil pump.

[0006] In order to achieve the above-mentioned object, the present invention provides a filter device for a hydraulic oil pump, comprising: a tubular housing, end covers mounted on both ends of the housing, a bracket rotatably arranged inside the housing, an adjustment mechanism mounted on the end covers for driving the bracket to rotate, and a plurality of groups of filter mechanisms uniformly arranged along the circumferential direction of the housing and all mounted on the bracket;

[0007] The bracket includes a pair of rotating ring sheets whose outer edges are in sliding contact with the outer shell coaxially and are respectively in close contact with the corresponding end covers, a pipe sleeve at both ends fixedly connected to the inner edges of the pair of rotating ring sheets, and a plurality of spacer plates arranged at intervals along the circumferential direction of the rotating ring sheets and in close contact with the pair of rotating ring sheets, the spacer plates are in close contact with the outer wall of the pipe sleeve and in close contact with the inner wall of the outer shell on the side away from the pipe sleeve, the number of the spacer plates is an even number, each group of filtering mechanisms is assembled on the pipe sleeve and is located between two adjacent spacer plates, a first oil-passing groove corresponding to the filtering mechanism is penetrated through the pipe sleeve, and a pair of connecting ports evenly distributed along the circumferential direction are provided on the outer shell, and the diameter of the connecting port is smaller than the spacing between the two spacer plates.

[0008] Preferably, a plurality of mounting bars are protruded from the inner wall of the pipe sleeve and are arranged in the same length direction and are evenly distributed along the circumferential direction of the rotating ring sheet. The number of the mounting bars is the same as the number of the spacer plates, and the first oil-passing groove is located between two adjacent mounting bars.

[0009] The bracket is equipped with a pair of mounting ring pieces which are respectively fixedly connected to the two ends of the mounting strips and whose outer edges are in close contact with the inner wall of the pipe sleeve. The mounting strips are hinged with a cover plate through a pair of first hinge shafts in the same length direction. A pair of cover plates located close to two adjacent mounting strips can rotate to fit and contact the inner edges of the mounting ring pieces. A cylindrical portion arranged away from the first hinge shaft is protruded on the side of the cover plate opposite to one of the end covers. A guide plate is coaxially fixedly connected to the cover plate opposite to the cylindrical portion. A closed special-shaped guide groove is recessed on the guide plate for sliding insertion of several cylindrical portions. When the bracket rotates, the cover plate opposite to the connection port is driven to rotate away from the pipe sleeve through the cooperation of the special-shaped guide groove and the cylindrical portion, and can drive the corresponding cover plate to rotate so that the cover plate misaligned with the connection port is in close contact with the inner edge of the mounting ring piece.

[0010] Preferably, the special-shaped guide groove includes a pair of open grooves evenly distributed along the circumferential direction of the guide disk, a pair of closed grooves coaxially arranged with the guide disk and evenly distributed along the circumferential direction of the guide disk, and four transition grooves for connecting corresponding closed groove ends with corresponding open groove ends, and the distance between the open groove and the axis of the guide disk is smaller than the distance between the closed groove and the axis of the guide disk.

[0011] Preferably, the pair of end covers are an upper end cover and a lower end cover respectively, the top of the rotating ring sheet located at the upper end is coaxially protruded with an annular flange, and the upper end cover is concavely provided with a circular stepped groove whose inner side is in sliding contact with the outer wall of the annular flange;

[0012] The adjustment mechanism includes an annular rack fixedly connected coaxially with the inner wall of the annular flange, a connecting shaft axially connected to and passing through the upper end cover, a gear fixedly sleeved on the connecting shaft and meshing with the annular rack, and a turning handle component assembled on the end of the connecting shaft away from the gear.

[0013] Preferably, the handlebar component comprises a connecting block fixedly connected to the end of the connecting shaft, a rotating arm hinged to the connecting block through a second hinge axis whose axis direction is perpendicular to the axis direction of the connecting shaft, and a positioning bolt threadedly assembled on the connecting block, and a positioning groove for inserting the end of the positioning bolt is recessed on the upper end cover;

[0014] The number of teeth on the annular rack is a times the number of teeth on the gear, where a is an integer, and the number of the spacer plates is b, where a is an integer multiple of b.

[0015] Preferably, the side of the cover plate connected to the first hinge axis is a first arcuate side tangent to the mounting strip and coaxially arranged with the first hinge axis, and the side of the cover plate away from the first hinge axis is a second arcuate side tangent to another side of the cover plate.

[0016] Preferably, the filtering mechanism comprises a pair of spaced-apart limiting clamping plates assembled on the pipe sleeve by a plurality of mounting bolts, and a filter element located between the pair of limiting clamping plates, wherein a plurality of second oil-passing grooves are penetrated through the clamping plates.

[0017] Preferably, the housing is provided with a cleaning window facing the corresponding filtering mechanism, and the cleaning window is equipped with a cover plate.

[0018] According to the above technical solution, the present invention provides a filter device for a hydraulic oil pump, which has the following beneficial technical effects compared with the prior art:

[0019] First, when it is found that the oil permeability of the filter mechanism has deteriorated, there is no need to immediately remove the filter device to replace the internal filter mechanism. The bracket can be rotated so that the unused filter mechanism is directly opposite to the connection port. The used filter mechanism can be replaced during idle time, which ensures normal use and improves the replacement fault tolerance rate. Normal use will not be affected by the deterioration of the oil permeability of the filter mechanism.

[0020] Secondly, the bracket is driven to rotate by the adjusting mechanism so that the other two unused filtering mechanisms are respectively facing a pair of connecting ports, and the two partition plates of the first accommodating space where the impurities are accumulated are misaligned with the connecting ports, so that the accumulated impurities will not enter the oil again;

[0021] Thirdly, when the oil passes through the filtering device, it passes through two sets of filtering mechanisms to improve the filtering effect.

[0022] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation mode; and the parts not involved in the present invention are the same as the prior art or can be implemented by using the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 It is a three-dimensional structural schematic diagram of a filter device for a hydraulic oil pump provided by the present invention;

[0025] Figure 2 It is a schematic diagram of the three-dimensional structure of a filter device for a hydraulic oil pump provided by the present invention with the housing and the end cover removed;

[0026] Figure 3 The invention provides a filter device for a hydraulic oil pump. Figure 1 Schematic diagram of the perspective along A;

[0027] Figure 4 The invention provides a filter device for a hydraulic oil pump. Figure 3 Middle section along the BB line of sight;

[0028] Figure 5 The present invention provides a partial three-dimensional structure diagram of a filter device for a hydraulic oil pump. Figure 1 ;

[0029] Figure 6 It is a three-dimensional structural schematic diagram of a bracket of a filter device for a hydraulic oil pump provided by the present invention;

[0030] Figure 7 The present invention provides a partial three-dimensional structure diagram of a filter device for a hydraulic oil pump. Figure 2 .

[0031] Description of Reference Numerals

[0032] 1. Outer shell; 2. End cover; 3. Filter mechanism; 4. Rotating ring; 5. Pipe sleeve; 6. Spacer; 7. First oil passage groove; 8. Connecting port; 9. Mounting strip; 10. Mounting ring; 11. Cover plate; 12. Cylindrical part; 13. Guide plate; 14. Opening slide; 15. Closing slide; 16. Transition slide; 17. Annular flange; 18. Annular rack; 19. Connecting shaft; 20. Gear; 21. Connecting block; 22. Swivel arm; 23. Positioning bolt; 24. Cleaning window; 25. Cover plate. DETAILED DESCRIPTION

[0033] The specific implementation of the present invention 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 invention, and is not used to limit the present invention.

[0034] In the present invention, unless otherwise stated, directional words such as "upper, lower, inside, outside" contained in a term merely represent the orientation of the term in normal usage, or are common names understood by those skilled in the art, and should not be regarded as limitations on the term.

[0035] like Figure 1-7 As shown, a filter device for a hydraulic oil pump comprises: a tubular housing 1, end caps 2 mounted on both ends of the housing 1, a bracket rotatably arranged inside the housing 1, an adjustment mechanism mounted on the end cap 2 for driving the bracket to rotate, and a plurality of filter mechanisms 3 uniformly arranged along the circumferential direction of the housing 1 and mounted on the bracket;

[0036] The bracket includes a pair of rotating ring pieces 4 whose outer edges are in sliding contact with the outer shell 1 coaxially and are respectively in contact with the corresponding end covers 2, a pipe sleeve 5 with two ends fixedly connected to the inner edges of the pair of rotating ring pieces 4, and a plurality of spacer plates 6 arranged at intervals along the circumferential direction of the rotating ring pieces 4 and fixedly connected to the pair of rotating ring pieces 4, the spacer plates 6 are fixedly fitted to the outer wall of the pipe sleeve 5 and the side away from the pipe sleeve 5 is in sliding contact with the inner wall of the outer shell 1, the number of the spacer plates 6 is an even number, each group of filtering mechanisms 3 is assembled on the pipe sleeve 5 and is located between two adjacent spacer plates 6, the pipe sleeve 5 is penetrated by a first oil-passing groove 7 corresponding to the filtering mechanism 3, and the outer shell 1 is provided with a pair of connecting ports 8 evenly distributed along the circumferential direction, and the diameter of the connecting port 8 is smaller than the spacing between the two spacer plates 6.

[0037] In the above technical solution, a pair of adjacent partition plates 6, the pipe sleeve 5 and a pair of rotating ring pieces 4 form a first accommodation space, and each set of filter mechanisms 3 is assembled in a corresponding accommodation space. When in use, the oil enters between two adjacent partition plates 6 through one of the connection ports 8, enters the pipe sleeve 5 after passing through the corresponding filter mechanism 3, and then passes through the filter mechanism 3 opposite to the other connection port 8. Therefore, when the oil passes through the filtering device, it passes through two sets of filter mechanisms 3, thereby improving the filtering effect.

[0038] Because the partition plate 6 is in sliding contact with the inner wall of the outer shell 1, and the diameter of the connecting port 8 is smaller than the distance between the two partition plates 6, the oil will not pass through the filtering mechanism 3 which is misaligned with the connecting port 8. Most impurities will be filtered out by the filtering mechanism 3 for the first time, and these impurities will accumulate in the first accommodating space. A small number of impurities will be filtered out by the filtering mechanism 3 for the second time, and these impurities will accumulate in the pipe sleeve 5.

[0039] After the filter mechanism 3 has been used for a period of time, the oil permeability of the corresponding first filter mechanism 3 becomes worse. The bracket is driven to rotate by the adjustment mechanism so that the other two unused filter mechanisms 3 are respectively opposite to a pair of connection ports 8, and the two partition plates 6 of the first accommodating space for accumulated impurities are misaligned with the connection ports 8. At this time, the accumulated impurities will not enter the oil again, avoiding the problem of repeated filtration, thereby extending the service life of the entire filter device. There are fewer impurities in the pipe sleeve 5 and the impact on the filter device is small.

[0040] When it is found that the oil permeability of the filter mechanism 3 has deteriorated, there is no need to immediately remove the filter device to replace the internal filter mechanism 3. The bracket can be rotated so that the unused filter mechanism 3 is opposite to the connection port 8. The filter device can still be used normally, and the used filter mechanism 3 can be replaced during idle time, which ensures normal use and improves the replacement fault tolerance rate, and normal use will not be affected by the deterioration of the oil permeability of the filter mechanism 3.

[0041] In a preferred embodiment of the invention, a plurality of mounting bars 9 are protruded from the inner wall of the pipe sleeve 5 and are arranged in the same length direction and are evenly distributed along the circumferential direction of the rotating ring plate 4. The number of the mounting bars 9 is the same as the number of the spacer plates 6. The first oil-passing groove 7 is located between two adjacent mounting bars 9.

[0042] The bracket is equipped with a pair of mounting ring pieces 10 which are respectively fixedly connected to the two ends of the mounting strips 9 and the outer edges of which are in contact with the inner wall of the pipe sleeve 5. The mounting strips 9 are hinged with cover plates 11 through a pair of first hinge shafts in the same length direction. A pair of cover plates 11 located on two adjacent mounting strips 9 can rotate to fit in contact with the inner edges of the mounting ring pieces 10. A cylindrical portion 12 arranged away from the first hinge shaft is protruded on the side of the cover plate 11 facing one of the end covers 2. A guide plate 13 is coaxially fixedly connected to the cover plate 25 opposite to the cylindrical portion 12. A closed special-shaped guide groove is recessed on the guide plate 13 for sliding insertion of several cylindrical portions 12. When the bracket rotates, the special-shaped guide groove cooperates with the cylindrical portion 12 to drive the cover plate 11 facing the connection port 8 to rotate away from the pipe sleeve 5 and can drive the corresponding cover plate 11 to rotate so that the cover plate 11 misaligned with the connection port 8 is in contact with the inner edge of the mounting ring piece 10.

[0043] In the above technical solution, two adjacent mounting strips 9, the pipe sleeve 5 and a pair of mounting ring sheets 10 form a second accommodating space, and impurities filtered out by the filter mechanism 3 passing through for the second time will accumulate in the second accommodating space. After the bracket rotates, with the cooperation of the special-shaped guide groove and the cylindrical portion 12, the cover plate 11 offset from the connection port 8 will cover the opening of the second accommodating space, which can prevent the filtered impurities from mixing into the oil again and can also isolate other unused filter mechanisms 3, and the cover plate 11 directly opposite to the connection port 8 will rotate away from the inner wall of the pipe sleeve 5, so that the opening of the second accommodating space is opened, and the corresponding filter mechanism 3 can be used normally.

[0044] In a preferred embodiment of the invention, the special-shaped guide groove includes a pair of open grooves 14 evenly distributed along the circumferential direction of the guide plate 13, a pair of closed grooves 15 coaxially arranged with the guide plate 13 and evenly distributed along the circumferential direction of the guide plate 13, and four transition grooves 16 for connecting the corresponding ends of the closed grooves 15 with the corresponding ends of the open grooves 14, and the distance between the open groove 14 and the axis of the guide plate 13 is smaller than the distance between the closed groove 15 and the axis of the guide plate 13.

[0045] In the above technical solution, when the cylindrical portion 12 slides from the closed slide groove 15 into the open slide groove 14, the cylindrical portion 12 slides into the transition slide groove 16, and the cylindrical portion 12 moves away from the mounting ring piece 10, thereby driving the corresponding cover plate 11 to rotate around the first hinge axis away from the mounting ring piece 10. When the cylindrical portion 12 enters the open slide groove 14, the corresponding two cover plates 11 will be in a state of being away from the mounting ring piece 10.

[0046] When the cylindrical portion 12 slides from the open slot 14 into the closed slot 15, the cylindrical portion 12 moves close to the mounting ring piece 10, driving the cover plate 11 to rotate around the first hinge axis close to the mounting ring piece 10, so that a pair of cover plates 11 cover the corresponding openings of the second accommodating space.

[0047] In a preferred embodiment of the invention, a pair of end covers 2 are respectively an upper end cover and a lower end cover, and the top of the rotating ring piece 4 located at the upper end is coaxially protruded with an annular flange 17, and the upper end cover is concavely provided with a circular stepped groove whose inner side is in sliding contact with the outer wall of the annular flange 17;

[0048] The adjustment mechanism includes an annular rack 18 coaxially fixedly connected to the inner wall of the annular flange 17, a connecting shaft 19 axially connected to the upper end cover and passing through the upper end cover, a gear 20 fixedly sleeved on the connecting shaft 19 and meshing with the annular rack 18, and a turning handle component assembled at the end of the connecting shaft 19 away from the gear 20.

[0049] In the above technical solution, the connecting shaft 19 is driven to rotate by the turning handle component, and the connecting shaft 19 drives the gear 20 to rotate, thereby driving the bracket to rotate through the annular rack 18, thereby changing the position of the filter mechanism 3, so that different filter mechanisms 3 are opposite to the connection port 8.

[0050] In a preferred embodiment of the invention, the turning handle member includes a connecting block 21 fixedly connected to the end of the connecting shaft 19, a turning arm 22 hingedly connected to the connecting block 21 through a second hinge axis whose axis direction is perpendicular to the axis direction of the connecting shaft 19, and a positioning bolt 23 threadedly assembled on the connecting block 21, and a positioning groove for inserting the end of the positioning bolt 23 is recessed on the upper end cover;

[0051] The number of teeth on the annular rack 18 is a times the number of teeth on the gear 20 , where a is an integer. The number of the spacer plates 6 is b, where a is an integer multiple of b.

[0052] In the above technical solution, the number of teeth on the annular rack 18 is a times the number of teeth on the gear 20, where a is an integer. The number of the spacer plates 6 is b, where a is an integer multiple of b. The connecting shaft 19 only needs to be rotated a full number of circles to enable the adjacent filter mechanism 3 to rotate to face the connecting port 8. When the filter mechanism 3 cannot be observed with the naked eye, the difficulty of operation can be reduced. Inserting the end of the positioning bolt 23 into the positioning groove can prevent the bracket from rotating during use.

[0053] In a preferred embodiment of the invention, the side edge of the cover plate 11 connected to the first hinge axis is a first arcuate edge tangent to the mounting strip 9 and coaxially arranged with the first hinge axis, and the side edge of the cover plate 11 away from the first hinge axis is a second arcuate edge tangent to the side edge of another cover plate 11.

[0054] In the above technical solution, the first arcuate edge and the second arcuate edge are provided to improve the sealing performance.

[0055] In a preferred embodiment of the invention, the filtering mechanism 3 includes a pair of spaced-apart limiting clamps assembled on the pipe sleeve 5 by a plurality of mounting bolts and a filter element located between the pair of limiting clamps, wherein the clamps are penetrated by a plurality of second oil-passing grooves.

[0056] In the above technical solution, the filter element can be made of existing filter materials such as non-woven fabrics, and the filter element can be tightly clamped by a pair of limiting clamps.

[0057] In a preferred embodiment of the invention, a cleaning window 24 facing the corresponding filter mechanism 3 is provided on the housing 1 , and a cover plate 25 is mounted on the cleaning window 24 .

[0058] In the above technical solution, when performing simple cleaning, there is no need to remove the end cover 2 and take out the bracket. You only need to open the cover plate 25 to clean the impurities accumulated in the corresponding first storage space, and then rotate the bracket to clean the impurities in each first storage space. Since most of the impurities are accumulated in the first storage space, the cover plate 25 can be opened for cleaning during simple cleaning.

[0059] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0060] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0061] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A filter device for a hydraulic oil pump, characterized in that: include: A tubular housing (1), end covers (2) mounted at both ends of the housing (1), a bracket rotatably arranged inside the housing (1), an adjustment mechanism mounted on the end covers (2) and used to drive the bracket to rotate, and a plurality of filtering mechanisms (3) uniformly arranged along the circumferential direction of the housing (1) and mounted on the bracket; The bracket comprises a pair of rotating ring pieces (4) whose outer edges are both in sliding contact with the outer shell (1) coaxially and are respectively in close contact with the corresponding end covers (2), a pipe sleeve (5) whose two ends are respectively fixedly connected to the inner edges of the pair of rotating ring pieces (4), and a plurality of spacer plates (6) arranged at intervals along the circumferential direction of the rotating ring pieces (4) and are in close contact with the pair of rotating ring pieces (4). The spacer plates (6) are in close contact with the outer wall of the pipe sleeve (5) and the side away from the pipe sleeve (5) is in close contact with the inner wall of the outer shell (1). The number of the spacer plates (6) is an even number. Each group of filtering mechanisms (3) is assembled on the pipe sleeve (5) and is located between two adjacent spacer plates (6). A first oil-passing groove (7) corresponding to the filtering mechanism (3) is provided through the pipe sleeve (5). The outer shell (1) is provided with a pair of connection ports (8) evenly distributed along the circumferential direction. The diameter of the connection port (8) is smaller than the distance between the two spacer plates (6).

2. A filter device for a hydraulic oil pump according to claim 1, characterized in that: A plurality of mounting strips (9) are protruded from the inner wall of the pipe sleeve (5) and are arranged in the same length direction and are evenly distributed along the circumferential direction of the rotating ring plate (4). The number of the mounting strips (9) is the same as the number of the spacer plates (6). The first oil-passing groove (7) is located between two adjacent mounting strips (9). The bracket is provided with a pair of mounting rings (10) respectively fixedly connected to the two ends of the mounting strips (9) and with the outer edges thereof in close contact with the inner wall of the pipe sleeve (5); the mounting strips (9) are each hingedly connected with a cover plate (11) via a pair of first hinge shafts in the same length direction; a pair of cover plates (11) located adjacent to each other on two adjacent mounting strips (9) can rotate to be in close contact with the inner edges of the mounting rings (10); a cylindrical portion (12) protrudes from a side of the cover plate (11) directly opposite to one of the end covers (2) and arranged away from the first hinge shaft, and is connected to the cover plate (11) by a hinge. A guide plate (13) is coaxially fixedly connected to a cover plate (25) opposite to the cylindrical portion (12); a closed special-shaped guide slot is recessed on the guide plate (13) for sliding insertion of a plurality of cylindrical portions (12); when the bracket rotates, the special-shaped guide slot cooperates with the cylindrical portion (12) to drive the cover plate (11) opposite to the connection port (8) to rotate away from the pipe sleeve (5) and can drive the corresponding cover plate (11) to rotate so that the cover plate (11) misaligned with the connection port (8) is in close contact with the inner edge of the mounting ring plate (10).

3. A filter device for a hydraulic oil pump according to claim 2, characterized in that: The special-shaped guide groove comprises a pair of open grooves (14) uniformly distributed along the circumferential direction of the guide plate (13), a pair of closed grooves (15) coaxially arranged with the guide plate (13) and uniformly distributed along the circumferential direction of the guide plate (13), and four transition grooves (16) for connecting the corresponding ends of the closed grooves (15) with the corresponding ends of the open grooves (14), wherein the distance between the open groove (14) and the axis of the guide plate (13) is smaller than the distance between the closed groove (15) and the axis of the guide plate (13).

4. A filter device for a hydraulic oil pump according to claim 1, characterized in that: A pair of end covers (2) are respectively an upper end cover and a lower end cover, the top of the rotating ring plate (4) located at the top is coaxially protruded with an annular flange (17), and the upper end cover is concavely provided with a circular stepped groove whose inner side is in sliding contact with the outer wall of the annular flange (17); The adjustment mechanism comprises an annular rack (18) fixedly connected coaxially with the inner wall of the annular flange (17), a connecting shaft (19) axially connected to the upper end cover and passing through the upper end cover, a gear (20) fixedly sleeved on the connecting shaft (19) and meshing with the annular rack (18), and a turning handle component assembled on the end of the connecting shaft (19) away from the gear (20).

5. A filter device for a hydraulic oil pump according to claim 4, characterized in that: The handlebar component comprises a connecting block (21) fixedly connected to the end of the connecting shaft (19), a rotating arm (22) hingedly connected to the connecting block (21) via a second hinge axis whose axis direction is perpendicular to the axis direction of the connecting shaft (19), and a positioning bolt (23) threadedly assembled on the connecting block (21); a positioning groove is recessed on the upper end cover for inserting the end of the positioning bolt (23); The number of teeth on the annular rack (18) is a times the number of teeth on the gear (20), where a is an integer, and the number of the spacer plates (6) is b, where a is an integer multiple of b.

6. A filter device for a hydraulic oil pump according to claim 2, characterized in that: The side edge of the cover plate (11) connected to the first hinge axis is a first arcuate edge tangent to the mounting strip (9) and coaxially arranged with the first hinge axis, and the side edge of the cover plate (11) away from the first hinge axis is a second arcuate edge that can be tangent to the side edge of another cover plate (11).

7. A filter device for a hydraulic oil pump according to claim 1, characterized in that: The filtering mechanism (3) comprises a pair of spaced-apart limiting clamping plates assembled on the pipe sleeve (5) via a plurality of mounting bolts, and a filtering element located between the pair of limiting clamping plates, wherein a plurality of second oil passage grooves are penetrated through the clamping plates.

8. The filter device for a hydraulic oil pump according to claim 1, characterized in that: The housing (1) is provided with a cleaning window (24) directly facing the corresponding filtering mechanism (3), and the cleaning window (24) is equipped with a cover plate (25).

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