CN210230270U

CN210230270U - Filter equipment and filtration system

Info

Publication number: CN210230270U
Application number: CN201920965334.0U
Authority: CN
Inventors: Qingjian Dong; 董庆建; Wei Han; 韩伟; Tao Gong; 宫涛; Yuanping Wang; 汪远平; Jian Xu; 徐建
Original assignee: Shantui Chutian Construction Machinery Co Ltd
Current assignee: Shantui Chutian Construction Machinery Co Ltd
Priority date: 2019-06-25
Filing date: 2019-06-25
Publication date: 2020-04-03
Anticipated expiration: 2029-06-25

Abstract

The utility model relates to a filter technical field discloses a filter equipment and filtration system. The utility model provides a filter equipment includes rose box, magnetism gyro wheel, drive unit and scum board, through the iron fillings in the magnetic roller constantly adsorbs the working oil to rotate through drive unit drive magnetism gyro wheel, so that the scum board strikes off the iron fillings that adsorb on the magnetic roller, realize the automatic clearance of iron fillings, prolonged the change cycle of working oil, improved filter effect and filtration efficiency. And through the setting that keeps off the flow board, make working oil and iron fillings mix ground more evenly, because the adsorption efficiency of magnetism gyro wheel is limited, be unlikely to reduce the filter effect because of the iron fillings content of part working oil is higher.

Description

Filter equipment and filtration system

Technical Field

The utility model relates to a filter technical field especially relates to a filter equipment and filtration system.

Background

The variable speed of oil pressure machinery transmission formula track bull-dozer turns to oil pressure system is open oil pressure system, and inevitable in the complete machine assembling process has the pollutant to get into oil pressure system, and the main source of pollutant has: 1. mechanical impurities brought in during the assembly process; 2. mechanical scrap iron generated by abrasion of a gear transmission system and an oil pressure element in a test run process; 3. moisture and dust in the outside air enter the system.

For magnetic impurities such as iron filings, the currently adopted filtering device comprises a coarse filter arranged at an oil inlet of the steering pump and a fine filter arranged at an oil outlet of the steering pump. However, the increase of the oil pressure resistance is inevitably caused by the over-high precision grade of the fine filter in the oil pressure system, and then the energy loss is increased; if the precision grade of the fine filter is too low, the circulating pressure can be reduced, but the defect that the filtering precision cannot meet the requirement exists. And through a period of use, can have more iron fillings on the coarse filter, need regularly to shut down and clear up the iron fillings on the coarse filter, waste time and energy, influence work efficiency.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a filter equipment and filtration system realize automatic clearance iron fillings in the working process, improve work efficiency.

To achieve the purpose, the utility model adopts the following technical proposal:

a filtration device comprising:

the filter box comprises an oil inlet cavity provided with an oil inlet and a first outlet, and an oil outlet cavity which is positioned below the oil inlet cavity and communicated with the oil inlet cavity; a flow baffle is arranged on the inner wall of the oil inlet cavity on the side opposite to the oil inlet, the lower end of the flow baffle inclines towards the lower part of the oil inlet, and a first outlet is formed between the flow baffle and the bottom wall of the oil inlet cavity;

the magnetic roller is arranged right opposite to the first outlet, and the driving unit is connected to the magnetic roller and can drive the magnetic roller to rotate;

and the slag scraping plate is arranged on one side of the magnetic roller to scrape iron chips adsorbed on the surface of the magnetic roller.

As a preferred technical scheme of the above filtering device, an arc-shaped groove is formed in the surface of the filtering box, and two ends of the arc-shaped groove are respectively communicated with the first outlet and the oil outlet cavity;

the magnetic roller is arranged in the arc-shaped groove and is spaced from the inner wall of the arc-shaped groove.

As a preferable technical solution of the above filtering apparatus, a bottom wall of the oil inlet chamber is inclined from the oil inlet to the first outlet.

As an optimal technical scheme of the filtering device, the filtering device further comprises a collecting cavity, the slag scraping plate is arranged between the collecting cavity and the magnetic roller, and the collecting cavity is used for receiving scrap iron scraped from the surface of the magnetic roller.

As an optimized technical scheme of the filtering device, the oil inlet cavity and the oil outlet cavity are communicated through the second inlet, the oil outlet cavity is provided with an oil discharge port, the oil discharge port is communicated with an oil discharge pipe, and one end of the oil discharge pipe extends to the bottom of the oil outlet cavity and is located below the second inlet.

The utility model also provides a filtering system, which comprises a main oil tank, a first oil suction pump, the filtering device, a second oil suction pump, a first filtering group and a second filtering group, which are arranged in sequence along the flowing direction of the working oil and form a circulation loop;

the filtering precision of the first filtering group is smaller than that of the second filtering group.

As a preferable technical solution of the above filtration system, the filtration system further includes:

the clean oil tank and the filling pump are arranged between the first filtering group and the second filtering group, and the clean oil tank is positioned at the upstream of the filling pump;

and the circulating reversing valve is arranged between the filtering device and the oil inlet of the second oil suction pump, and enables the oil inlet of the second oil suction pump to be selectively communicated with the filtering device or the oil purification tank.

and the cleanliness detection device is used for detecting the cleanliness of the working oil filtered by the second filtering group.

the first standby filtering set is connected with the first filtering set in parallel and arranged between the second oil suction pump and the second filtering set;

the first reversing valve group can control the oil outlet of the second oil suction pump to be selectively communicated with the second filtering group through the first filtering group or the first standby filtering group.

the second standby filtering group is connected with the second filtering group in parallel and is arranged between the oil outlet of the first filtering group and the main oil tank;

the second reversing valve group can control the oil outlet of the filling pump to be selectively communicated with the main oil tank through the second filtering group or the second standby filtering group.

The utility model has the advantages that: the utility model provides a filter equipment passes through the iron fillings that magnetism gyro wheel constantly adsorbs the working oil to strike off the iron fillings that adsorb on the magnetism gyro wheel through the scum board, realize the automatic clearance of iron fillings, prolonged the change cycle of working oil, improved filter effect and filtration efficiency. And carry out the vortex through the working oil that the fender flows the board in to the oil feed intracavity, make working oil and iron fillings mix ground more evenly, because the adsorption efficiency of magnetism gyro wheel is limited be unlikely to reduce the filter effect because of the iron fillings content of part working oil is higher, improved the filter effect.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a filtering apparatus provided in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a filtering system according to an embodiment of the present invention.

In the figure:

1. a filtration device; 11. a filter box; 111. an oil inlet cavity; 1111. a first inlet; 1112. a first outlet; 112. a first oil outlet cavity; 1121. a second inlet; 1122. a second outlet; 113. a second oil outlet cavity; 1131. an oil discharge port; 114. a flow baffle plate; 115. an oil discharge pipe; 116. an arc-shaped slot;

12. a magnetic roller; 13. a slag scraping plate; 14. a collection chamber;

2. a main fuel tank; 3. a first oil suction pump; 4. a coarse filter; 5. a second oil suction pump; 6. a first filtration group; 7. a clean oil tank; 8. a filling pump; 9. a second filtration group; 10. a circulation reversing valve; 20. a first backup filter bank; 30. a second, backup filtration bank; 40. a first two-position three-way directional valve; 50. a second two-position three-way reversing valve; 60. a third two-position three-way reversing valve; 70. a fourth two-position three-way reversing valve; 80. cleanliness detection device.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements related to the present invention are shown in the drawings.

Fig. 1 is a schematic structural diagram of a filtering apparatus according to this embodiment, and as shown in fig. 1, this embodiment provides a filtering apparatus for performing magnetic adsorption filtering on working oil containing magnetic substances such as iron filings, and the structure and the operation principle of the filtering apparatus will be described in detail below by taking filtering of working oil in a construction vehicle such as a bulldozer, a road roller, a grader, and the like as an example.

Fig. 1 is a schematic structural diagram of a filtering apparatus according to this embodiment, and as shown in fig. 1, this embodiment provides a filtering apparatus for performing magnetic adsorption filtering on working oil containing magnetic substances such as iron filings, and the structure and the operation principle of the filtering apparatus 1 will be described in detail below by taking filtering of working oil in a construction vehicle such as a bulldozer, a road roller, a grader, and the like as an example.

The filter device 1 provided by the embodiment comprises a magnetic roller 12 and a driving unit, wherein the driving unit is connected to the magnetic roller 12 and can drive the magnetic roller 12 to rotate, and iron chips in the working oil are adsorbed by the magnetic roller 12. The driving unit may be a motor or other structure capable of driving the magnetic roller 12 to rotate in the prior art, and will not be described in detail herein. Preferably, the magnetic roller 12 is made of a permanent magnet.

The filtering device 1 further comprises a filtering box 11, the filtering box 11 comprises an oil inlet cavity 111 and an oil outlet cavity, wherein the oil inlet cavity 111 is provided with a first inlet 1111 and a first outlet 1112, the oil outlet cavity is located below the oil inlet cavity 111, a flow baffle plate 114 is arranged on the inner wall of the oil inlet cavity 111 on the side opposite to the first inlet 1111, the lower end of the flow baffle plate 114 inclines towards the lower side of the first inlet 1111 and forms the first outlet 1112 with the bottom wall of the oil inlet cavity 111, and the magnetic roller 12 is arranged right opposite to the first outlet 1112. The working oil in the oil inlet cavity 111 can be mixed more uniformly through the flow baffle 114, and the iron filings in the working oil after being filtered are not higher due to the higher iron filings content of part of the working oil because the adsorption capacity of the magnetic roller 12 is limited.

The oil outlet cavity comprises a first oil outlet cavity 112 provided with a second inlet 1121 and a second oil outlet cavity 113 communicated with the first oil outlet cavity through a second outlet 1122, the heights of the first inlet 1111, the first outlet 1112, the second inlet 1121 and the second outlet 1122 are sequentially reduced, the second oil outlet cavity 113 is provided with an oil outlet 1131, the oil outlet 1131 is connected with an oil discharge pipe 115, and one end of the oil discharge pipe 115 extends downwards and is located below the second outlet 1122. The first oil outlet chamber 112 plays a role of buffering, and when the liquid level in the first oil outlet chamber 112 is lower than the height of the second outlet 1122, the first oil outlet chamber 112 has a settling function. When the height of the drain port 1131 is higher than the height of the second outlet 1122, the oil drain pipe 115 is provided to smoothly drain the working oil lower than the second outlet 1122 in the second oil outlet chamber 113.

Above-mentioned filter equipment 1 still includes scum board 13, and scum board 13 locates the one side of magnetism gyro wheel 12, and at magnetism gyro wheel 12 pivoted in-process, scum board 13 can strike off the iron fillings that adsorb on magnetism gyro wheel 12 surface. One side of the scraper 13 is provided with a collecting cavity 14, the scraper 13 is arranged between the collecting cavity 14 and the magnetic roller 12, and the upper part of the collecting cavity 14 is provided with an opening for receiving scrap iron scraped from the surface of the magnetic roller 12. The scraper 13 is provided with an inclined surface so that the iron chips scraped from the surface of the magnetic roller 12 can smoothly fall into the collecting chamber 14. In this embodiment, the scraper 13 is disposed at the upper end of the side wall of the collecting cavity 14 close to the magnetic roller 12, the collecting cavity 14 is also a part of the filter box 11, and the oil inlet cavity 111, the oil outlet cavity and the collecting cavity 14 are integrated, so as to simplify the structure of the filter box 11.

The working process of the filtering device 1 is as follows:

after the working oil entered the oil inlet cavity 111 from the first inlet 1111, the working oil flowed to the magnetic roller 12 from the first outlet 1112, the magnetic roller 12 adsorbs magnetic substances such as iron filings in the working oil, the magnetic roller 12 continuously rotates, the iron filings adsorbed on the surface of the magnetic roller 12 are continuously scraped by the scraper 13, the working oil filtered by the magnetic roller 12 enters the first oil outlet cavity 112 through the second inlet 1121, then flows into the second oil outlet cavity 113 through the second outlet 1122, and finally is discharged out of the second oil outlet cavity 113 through the oil discharge pipe 115 and the oil discharge port 1131.

This embodiment passes through magnetism gyro wheel 12 and adsorbs the iron fillings of working oil constantly to strike off the iron fillings that adsorb on the magnetism gyro wheel 12 through scum board 13, realize the automatic clearance of iron fillings, prolonged the change cycle of working oil, improved filter effect and filtration efficiency. Moreover, through the arrangement of the flow baffle 114, the working oil and the scrap iron are mixed more uniformly, and the filtering effect is improved because the adsorption capacity of the magnetic roller 12 is limited and the reduction of the filtering effect caused by the higher content of the scrap iron in part of the working oil is avoided.

Further, the bottom wall of the oil inlet cavity 111 is obliquely arranged from the first inlet 1111 to the first outlet 1112, part of the working oil flows along the bottom wall of the oil inlet cavity 111, part of the working oil flows to the flow baffle 114, and then the working oil flowing along the bottom wall of the oil inlet cavity 111 is converged under the flow guiding effect of the flow baffle 114.

Further, the lower end of the baffle plate 114 is provided with a blocking plate, the blocking plate is vertically arranged, an interval is arranged between the outer wall of the blocking plate and the magnetic roller 12, the blocking plate is prevented from contacting the magnetic roller 12 adsorbing iron filings, and the working oil splashed by impacting the magnetic roller 12 can be prevented from returning to the oil inlet cavity 111 through the first outlet 1112.

Further, an arc-shaped groove 116 is formed in the surface of the filter box 11, and two ends of the arc-shaped groove 116 are respectively communicated with the first outlet 1112 and the second inlet 1121; the magnetic roller 12 is disposed in the arc-shaped groove 116 and spaced from the inner wall of the arc-shaped groove 116. The arc-shaped groove 116 plays a role in guiding flow, the filtered working oil flows from one end of the arc-shaped groove 116 to the other end, and then enters the first oil outlet cavity 112 from the second inlet 1121, so that the working oil can be in full contact with the magnetic roller 12, and the filtering effect of the iron filings is improved. And set up the interval between arc groove 116 inner wall and magnetism gyro wheel 12, can avoid the iron fillings of adsorbing on the magnetism gyro wheel 12 to be scraped by arc groove 116 inner wall.

Fig. 2 is a schematic structural diagram of the filtering system provided in this embodiment, and as shown in fig. 2, this embodiment further provides a filtering system, which includes a main oil tank 2, a first oil suction pump 3, the above filtering device 1, a second oil suction pump 5, a first filtering set 6, and a second filtering set 9, which are sequentially arranged along a flow direction of the working oil and form a circulation loop, where a filtering precision of the first filtering set 6 is smaller than a filtering precision of the second filtering set 9.

The first oil suction pump 3 sucks the working oil in the main oil tank 2, after primary filtration is carried out by the filtering device 1, the working oil in the second oil outlet cavity 113 is pumped out by the second oil suction pump 5 through the oil discharge pipe 115 and is sent to the first filtering group 6 for secondary filtration, and then tertiary filtration is carried out by the second filtering group 9, and then the working oil returns to the main oil tank 2.

The first filtering group 6 and the second filtering group 9 each comprise at least one filter, and the filtering precision of each filter is gradually improved along the flowing direction of the working oil. In this embodiment, the first filter group 6 comprises three filters and the second filter group 9 comprises one filter. The structure of the filter is prior art and is not described in detail herein.

Further, in order to avoid the damage of the first oil suction pump 3 and the second oil suction pump 5 caused by the large-particle impurities in the working oil in the total oil tank 2, a coarse filter 4 is arranged at an oil inlet of the first oil suction pump 3, and the filtering precision degree of the coarse filter 4 is low.

Further, the filtering system further comprises a circulation reversing valve 10, and a clean oil tank 7 and a filling pump 8 which are arranged between the first filtering set 6 and the second filtering set 9, wherein the clean oil tank 7 is located at the upstream of the filling pump 8, the circulation reversing valve 10 is located between the filtering device 1 and an oil inlet of the second oil suction pump 5, and the circulation reversing valve 10 can control the oil inlet of the second oil suction pump 5 to be selectively communicated with the filtering device 1 and the clean oil tank 7. When the cleanliness of the working oil filtered by the filtering system does not meet the requirement, the oil inlet of the second oil suction pump 5 can be communicated with the oil purification tank 7 through the circulating reversing valve 10, at the moment, the oil purification tank 7, the second oil suction pump 5 and the first filtering group 6 form an oil purification loop, the working oil in the oil purification tank 7 is subjected to circulating filtration through the oil purification loop, and meanwhile, the filling pump 8 stops working.

The filtering system further comprises a cleanliness detection device 80 for detecting the cleanliness of the working oil filtered by the second filtering group 9, the circulating reversing valve 10 is arranged between the filtering device 1 and the second oil suction pump 5, whether the filtered working oil meets the cleanliness requirement is detected by the cleanliness detection device 80, and the circulating reversing valve 10 can control the oil inlet of the second oil suction pump 5 to be selectively communicated with the filtering device 1 and the oil purification tank 7 according to the detection result of the cleanliness detection device 80. Specifically, a bypass oil path is arranged between the oil outlets of the main oil tank 2 and the second filtering group 9, the cleanliness detection device 80 is arranged on the bypass oil path, and both an oil inlet and an oil outlet of the cleanliness detection device 80 are provided with switch valves. The cleanliness detection device 80 for detecting the cleanliness of the working oil in the present embodiment is a conventional technology, and will not be described in detail here. The circulation change valve 10 in this embodiment is a two-position three-way change valve.

When the cleanliness detection device 80 detects that the cleanliness of the working oil filtered by the second filtering set 9 does not meet the requirements, the circulation reversing valve 10 controls the oil inlet of the second oil suction pump 5 to be communicated with the oil purification tank 7, meanwhile, the filling pump 8 does not work, circulation filtering is carried out through an oil purification loop, after filtering for a certain time, the circulation reversing valve 10 acts to enable the oil inlet of the second oil suction pump 5 to be communicated with the filtering device 1, the filling pump 8 works, whether the cleanliness of the working oil filtered by the second filtering set 9 meets the requirements or not is determined through the cleanliness detection device 80, and if not, circulation filtering is continued.

Further, the filtering system further comprises a first spare filtering set 20, a first pressure detection device and a first reversing valve set, wherein the first spare filtering set 20 is connected with the first filtering set 6 in parallel and is arranged between the second oil suction pump 5 and the second filtering set 9; the oil inlets of the first standby filter group 20 and the first filter group 6 are respectively provided with a first pressure detection device; the first reversing valve group can control the oil outlet of the second oil suction pump 5 to be selectively communicated with the second filter group 9 through the first filter group 6 or the first spare filter group 20 according to the detection result of the first pressure detection device.

The first reversing valve set in this embodiment includes two-position three-way reversing valves, namely a first two-position three-way reversing valve 40 and a second two-position three-way reversing valve 50, wherein the first two-position three-way reversing valve 40 has an oil inlet and two oil outlets, the oil inlet of the first two-position three-way reversing valve is communicated with the oil outlet of the second oil suction pump 5, and the two oil outlets are respectively communicated with the oil inlet of the first filter set 6 and the oil inlet of the first backup filter set 20. The second two-position three-way reversing valve 50 has two oil inlets and one oil outlet, wherein the two oil inlets are respectively communicated with the oil outlet of the first filtering group 6 and the oil outlet of the first standby filtering group 20, and the oil outlet is communicated with the clean oil tank 7.

When the first pressure detection device at the oil inlet of the first filter group 6 detects that the oil pressure of the working oil exceeds the preset value, the first reversing valve group can enable the oil outlet of the second oil suction pump 5 to be communicated with the second filter group 9 through the first standby filter group 20, so that the filter element of the first filter group 6 can be replaced. When the first filtering set 6 and the first spare filtering set 20 are provided with a plurality of filters, an oil inlet of each filter is provided with a first pressure detection device, and when the pressure of the oil inlet of any filter exceeds a corresponding preset value, the oil outlet of the second oil suction pump 5 is controlled by the first reversing valve set to be selectively communicated with the second filtering set 9 through the first filtering set 6 or the first spare filtering set 20.

Further, the filtering system further comprises a second standby filtering group 30, a second pressure detection device and a second reversing valve group, wherein the second standby filtering group 30 and the second filtering group 9 are connected in parallel and are arranged between the filling pump 8 and the main oil tank 2; the oil inlets of the second standby filtering group 30 and the second filtering group 9 are respectively provided with a second pressure detection device; the second reversing valve group can control the oil outlet of the filling pump 8 to be selectively communicated with the main oil tank 2 through the second filtering group 9 or the second standby filtering group 30 according to the detection result of the second pressure detection device.

The second reversing valve set in this embodiment includes two-position three-way reversing valves, namely a third two-position three-way reversing valve 60 and a fourth two-position three-way reversing valve 70, wherein the third two-position three-way reversing valve 60 has an oil inlet and two oil outlets, the oil inlet of the third two-position three-way reversing valve is communicated with the oil outlet of the filling pump 8, and the two oil outlets are respectively communicated with the oil inlet of the second filter set 9 and the oil inlet of the second backup filter set 30. The fourth two-position three-way directional valve 70 has two oil inlets and one oil outlet, wherein the two oil inlets are respectively communicated with the oil outlet of the second filtering set 9 and the oil outlet of the second standby filtering set 30, and the oil outlet is communicated with the main oil tank 2.

When the second pressure detection device at the oil inlet of the second filter group 9 detects that the oil pressure of the working oil exceeds the preset value, the oil outlet of the filling pump 8 can be communicated with the main oil tank 2 through the second standby filter group 30 through the second reversing valve group, so that the filter element of the second filter group 9 can be replaced. When the second filtering group 9 and the second standby filtering group 30 are provided with a plurality of filters, the oil inlet of each filter is provided with a second pressure detection device, and when the pressure of the oil inlet of any filter exceeds a corresponding preset value, the oil outlet of the filling pump 8 is controlled by the second reversing valve group to be selectively communicated with the main oil tank 2 through the second filtering group 9 or the second standby filtering group 30.

In this embodiment, each filter in each of the first filter group 6, the first spare filter group 20, the second filter group 9, and the second spare filter group 30 is provided with an alarm device, and when the corresponding pressure detection device detects that the pressure exceeds the corresponding preset value, the alarm device reminds the operator of the need of replacing the filter element through sound prompt, light prompt, and the like, and the alarm device is provided to facilitate the operator to quickly determine the filter element to be replaced.

In this embodiment, the first pressure detection device and the second pressure detection device are both pressure sensors, and the employed directional valves are all electromagnetic valves, such as the circulation directional valve 10, the first two-position three-way directional valve 40, the second two-position three-way directional valve 50, the third two-position three-way directional valve 60, the fourth two-position three-way directional valve 70, and the like.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Claims

1. A filter device, comprising:

the filter box (11) comprises an oil inlet cavity (111) provided with a first inlet (1111) and a first outlet (1112), and an oil outlet cavity which is positioned below the oil inlet cavity (111) and communicated with the oil inlet cavity (111); a flow baffle plate (114) is arranged on the inner wall of the side, opposite to the first inlet (1111), of the oil inlet cavity (111), the lower end of the flow baffle plate (114) inclines towards the lower part of the first inlet (1111), and a first outlet (1112) is formed between the lower end of the flow baffle plate and the bottom wall of the oil inlet cavity (111);

the magnetic roller (12) is arranged right opposite to the first outlet (1112), and the driving unit is connected to the magnetic roller (12) and can drive the magnetic roller (12) to rotate;

the slag scraping plate (13) is arranged on one side of the magnetic roller (12) to scrape iron chips adsorbed on the surface of the magnetic roller (12).

2. The filtering device according to claim 1, characterized in that the surface of the filtering box (11) is provided with an arc-shaped groove (116), and two ends of the arc-shaped groove (116) are respectively communicated with the first outlet (1112) and the oil outlet chamber;

the magnetic roller (12) is arranged in the arc-shaped groove (116) and is spaced from the inner wall of the arc-shaped groove (116).

3. A filter device as claimed in claim 1, characterised in that the bottom wall of the oil inlet chamber (111) is inclined from the first inlet (1111) to the first outlet (1112).

4. A filter device as claimed in claim 1, further comprising a collecting chamber (14), the scraper bar (13) being arranged between the collecting chamber (14) and the magnetic roller (12), the collecting chamber (14) being adapted to receive scrap iron scraped from the surface of the magnetic roller (12).

5. The filtering device according to claim 1, wherein the oil inlet cavity (111) and the oil outlet cavity are communicated through a second inlet (1121), the oil outlet cavity is provided with an oil drain port (1131), the oil drain port (1131) is communicated with an oil drain pipe (115), and one end of the oil drain pipe (115) extends towards the bottom of the oil outlet cavity and is located below the second inlet (1121).

6. A filtering system, characterized by comprising a main oil tank (2), a first oil suction pump (3), a filtering device (1) according to any one of claims 1 to 5, a second oil suction pump (5), a first filtering group (6) and a second filtering group (9) which are arranged in sequence along the flow direction of the working oil and form a circulation loop;

the filtering accuracy of the first filtering group (6) is smaller than that of the second filtering group (9).

7. The filtration system of claim 6, further comprising:

the clean oil tank (7) and the filling pump (8) are arranged between the first filtering group (6) and the second filtering group (9), and the clean oil tank (7) is positioned at the upstream of the filling pump (8);

and the circulating reversing valve (10) is arranged between the filtering device (1) and an oil inlet of the second oil suction pump (5), and the circulating reversing valve (10) enables the oil inlet of the second oil suction pump (5) to be selectively communicated with the filtering device (1) or the oil purification tank (7).

8. The filtration system of claim 7, further comprising:

and the cleanliness detection device (80) is used for detecting the cleanliness of the working oil filtered by the second filtering group (9).

9. The filtration system of claim 7, further comprising:

the first standby filtering group (20), the first standby filtering group (20) is connected with the first filtering group (6) in parallel and is arranged between the second oil suction pump (5) and the second filtering group (9);

the first reversing valve group can control the oil outlet of the second oil suction pump (5) to be selectively communicated with the second filtering group (9) through the first filtering group (6) or the first standby filtering group (20).

10. The filtration system of claim 7, further comprising:

the second standby filtering group (30), the second standby filtering group (30) and the second filtering group (9) are connected in parallel and are arranged between the oil outlet of the first filtering group (6) and the main oil tank (2);

a second reversing valve group capable of controlling the oil outlet of the filling pump (8) to selectively communicate with the main oil tank (2) through the second filtering group (9) or the second backup filtering group (30).