Oil tank return oil self-cleaning coarse filtering device and static pressure lubricating system
By designing a self-cleaning coarse filter device for oil return from the oil tank, the filter screen is self-cleaned by the cooperation of the filter screen roll and scraper. This solves the problem of easy clogging of the filter screen in the hydrostatic lubrication system, reduces maintenance frequency and cost, and improves the service life of the filter.
Patent Information
- Application Number
- CN202520010365.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-02
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2035-01-02
AI Technical Summary
In existing hydrostatic lubrication systems, filters are easily clogged by large particles in harsh environments, leading to frequent maintenance and high costs.
Design an oil tank return self-cleaning coarse filter device, including a rectangular box, a filter screen, a filter screen roll, an impurity collection cylinder and a filter screen scraper. The filter screen roll drives the filter screen to move in a cycle, the impurity collection cylinder collects impurities, and the filter screen scraper removes the adhering impurities, thereby realizing the self-cleaning of the filter screen.
It effectively reduces filter clogging, decreases maintenance frequency and costs, and improves the sustainable use of the filter.
Smart Images
Figure CN223846414U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to oil liquid filtration technical field, specifically, relate to an oil tank oil return self -cleaning rough filter device and static pressure lubricating system. BACKGROUND
[0002] In prior art, the plate mill equipped with open liquid static pressure guide rail type double side shearing equipment is usually used to cut the plate, but when the oil liquid flows back to the oil tank through the guide rail return hole, the large particle material generated in the sheared steel plate will inevitably be brought back to the oil tank, and compared with the conventional thin oil lubricating system, the static pressure lubricating system has smaller oil return height difference and lower pressure head, so the large particle material generated in the sheared steel plate will have great influence on the static pressure lubricating system, and in order to realize stable operation of the static pressure lubricating system, it is necessary to filter the large particle material during the oil return process.
[0003] At present, in the static pressure lubricating system, the double cylinder filter with relatively rough filtering precision is usually selected to filter the large particle material in the oil liquid. SUMMARY
[0004] The utility model solves the problem of how to improve the sustainable use of the filter in the static pressure lubricating system.
[0005] In order to solve the above problems, the utility model provides an oil tank oil return self -cleaning rough filter device and static pressure lubricating system.
[0006] In the first aspect, the utility model provides an oil tank oil return self -cleaning rough filter device, which comprises a rectangular box body, a filter screen, a filter screen winding drum, a impurity collecting cylinder and a filter screen scraper.
[0007] In the length direction of the rectangular box body, two filter screen winding drums are arranged in the rectangular box body at intervals, and the extension direction of the filter screen winding drum is perpendicular to the length direction of the rectangular box body, the filter screen is wound on the two filter screen winding drums, and the two filter screen winding drums are used to drive the filter screen to move circularly.
[0008] The impurity collecting cylinder is located in the rectangular box body and is detachably connected to the short side inner wall of the rectangular box body, the impurity collecting cylinder is used to collect the impurities from the filter screen, and the bottom of the impurity collecting cylinder is provided with an oil outlet hole.
[0009] The filter screen scraper is arranged on the impurity collecting cylinder, one end of the filter screen scraper is in contact with the filter screen, and the filter screen scraper is used to scrape off the impurities adhered to the filter screen and fall into the impurity collecting cylinder.
[0010] Optionally, the two impurity collecting cylinders are symmetrically arranged and detachably connected to the opposite two short side inner walls of the rectangular box body.
[0011] Optionally, the rectangular box body is internally provided with impurity collecting grooves, and the two impurity collecting grooves are symmetrically arranged on the short side inner walls of the rectangular box body, and the impurity collecting grooves are provided with oil liquid overflow outlets, and each of the impurity collecting grooves is provided with the impurity collecting cylinder.
[0012] Optionally, the oil tank oil return self-cleaning rough filtering device further comprises a mesh plate arranged at the oil liquid overflow outlet.
[0013] Optionally, the long side wall of the rectangular box body is provided with a cleaning door, and the impurity collecting cylinder is used to be taken out from the rectangular box body through the cleaning door.
[0014] Optionally, the cleaning door is provided with an observation window.
[0015] Optionally, the oil tank oil return self-cleaning rough filtering device further comprises guide rods, and the two guide rods are arranged in the rectangular box body in the length direction of the rectangular box body, and the extension direction of the guide rods is parallel to the extension direction of the filter screen winding drum, the plane where the two guide rods are located is higher than the plane where the two filter screen winding drums are located, and the filter screens are wound on the two guide rods.
[0016] Optionally, the oil tank oil return self-cleaning rough filtering device further comprises baffles, and the two baffles are arranged between the long side inner walls of the rectangular box body and the filter screens.
[0017] Optionally, the oil tank oil return self-cleaning rough filtering device further comprises a chain wheel, a chain and a motor, the two chain wheels are connected to the two filter screen winding drums respectively, the chain is in transmission connection with the two chain wheels respectively, and the motor is in driving connection with one of the filter screen winding drums.
[0018] In the second aspect, the utility model provides a kind of static pressure lubrication system, comprising the oil tank oil return self-cleaning rough filtering device described above.
[0019] The oil tank oil return self-cleaning coarse filtering device has the beneficial effects that the impurity collecting cylinder is detachably connected to the short side inner wall of the rectangular box body, the two filter screen winding drums are arranged in the rectangular box body at intervals, the extension direction of the filter screen winding drum is perpendicular to the length direction of the rectangular box body, the filter screen is arranged on the two filter screen winding drums, the filter screen scraper is arranged on the impurity collecting cylinder, one end of the filter screen scraper is in contact with the filter screen, in use, the filter screen winding drum rotates to drive the filter screen to rotate towards the direction of the impurity collecting cylinder, the oil liquid with impurities is injected from the top and falls on the filter screen, the clean oil liquid passes through the filter screen and is discharged into the oil tank, the impurities are filtered on the filter screen, when the impurities rotate to the edge position with the filter screen, the larger impurities directly fall into the impurity collecting cylinder under the action of gravity, the smaller impurities may be stuck on the filter screen, when the filter screen scraper position is rotated, the filter screen scraper can scrape the smaller impurities stuck on the filter screen and fall into the impurity collecting cylinder, part of the oil liquid flowing into the impurity collecting cylinder is filtered and discharged into the oil tank through the oil outlet hole arranged at the lower part of the impurity collecting cylinder, coarse cleaning of the filter screen is realized, the problems of impurity accumulation on the filter screen and filter screen blockage are effectively reduced, the maintenance frequency and maintenance cost of the filter screen are reduced, and the sustainable use of the filter in the static pressure lubrication system is improved. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 It is a front view structural schematic diagram of the oil tank oil return self-cleaning coarse filtering device of the utility model embodiment.
[0021] Figure 2 It is a sectional view structural schematic diagram of the oil tank oil return self-cleaning coarse filtering device of the utility model embodiment.
[0022] Figure 3 It is a top view structural schematic diagram of the oil tank oil return self-cleaning coarse filtering device of the utility model embodiment.
[0023] BRIEF DESCRIPTION OF DRAWINGS:
[0024] 1-rectangular box body, 2-filter screen, 3-filter screen winding drum; 4-impurity collecting cylinder; 5-filter screen scraper; 6-impurity collecting groove; 7-mesh plate; 8-cleaning door; 81-observation window; 9-guide rod; 10-baffle; 11-chain wheel; 12-chain. DETAILED DESCRIPTION
[0025] In order to make the above objects, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application will be described in detail below with reference to the drawings. Although some embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms, and should not be interpreted as being limited to the embodiments described herein, on the contrary, these embodiments are provided to make the present application more thorough and complete. It should be understood that the drawings and embodiments of the present application are only for illustrative purposes, and are not intended to limit the scope of protection of the present application.
[0026] The term "comprising" and variations thereof as used herein are open-ended, that is "including, but not limited to"; the term "based on" is "based, at least in part, on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". Related definitions for other terms will be given in the description below. It should be noted that the concepts of "first", "second", etc. mentioned in the present application are only used to distinguish different devices, modules or units, and are not intended to limit the order or interdependence of the functions performed by these devices, modules or units.
[0027] It should be noted that the modification of "one" or "multiple" mentioned in the present application is illustrative and not limiting, and those skilled in the art should understand that unless otherwise explicitly indicated in the context, it should be understood as "one or more".
[0028] In view of the problems of the above related technologies, the present embodiment provides an oil tank oil return self-cleaning coarse filter device and a static pressure lubrication system.
[0029] As shown in Figures 1 to 3 The oil tank oil return self-cleaning coarse filter device provided by the embodiments of the present application comprises a rectangular box body, a filter screen, a filter screen winding drum, an impurity collecting cylinder and a filter screen scraper.
[0030] The two filter screen winding drums 3 are arranged in the rectangular box body 1 in the length direction, and the extension direction of the filter screen winding drums 3 is perpendicular to the length direction of the rectangular box body 1. The filter screen 2 is wound on the two filter screen winding drums 3, and the two filter screen winding drums 3 are used to drive the filter screen 2 to move circularly.
[0031] The impurity collecting cylinder 4 is located in the rectangular box body 1 and is detachably connected to the short side inner wall of the rectangular box body 1. The impurity collecting cylinder 4 is used to collect impurities from the filter screen 2. An oil outlet hole is formed in the bottom of the impurity collecting cylinder 4.
[0032] The filter scraper 5 is disposed on the impurity collection cylinder 4, and one end of the filter scraper 5 is in contact with the filter screen 2. The filter scraper 5 is used to scrape off the impurities adhering to the filter screen 2 and let them fall into the impurity collection cylinder 4.
[0033] Specifically, such as Figure 1 As shown, the two ends of the filter roll 3 are respectively set on the opposite long side walls of the rectangular box 1, and one end is connected to the drive structure. For example, two connection holes are opened on any one of the long side walls. Figure 3 The filter screen 2 is wound around the two filter screen rolls 3, with one end passing through holes a and b respectively, so that the ends of the filter screen rolls 3 are placed outside the rectangular box 1. The driving structure can be a drive motor or a drive handle. The ends of the filter screen rolls 3 are connected to the drive motor to drive the filter screen rolls 3 to rotate, or the operator can hold the drive handle to drive the filter screen rolls 3 to rotate. The other ends of the two filter screen rolls 3 are rotatably connected to the inner wall of another long side wall, and the two filter screen rolls 3 are on the same horizontal plane, that is, the two filter screen rolls 3 have the same height. During installation, the filter screen 2 is wound around the two filter screen rolls 3, creating a large filter screen space. The two filter screen rolls 3 are driven to rotate synchronously by, for example, a drive motor, so that the filter screen 2 rotates cyclically around the two filter screen rolls 3. The impurity collection cylinder 4 is detachably connected to the short inner wall of the rectangular box 1. For example, a locking hole is provided on the short inner wall of the rectangular box 1. A connecting clip is provided on the end face of the impurity collection cylinder 4 that connects to the short inner wall of the rectangular box 1 at the position corresponding to the locking hole. The connecting clip is inserted into the locking hole and fixed to connect the impurity collection cylinder 4 to the short inner wall of the rectangular box 1. If necessary, the impurity collection cylinder 4 can be disassembled for cleaning. It should be noted that the top of the impurity collection cylinder 4 is open to facilitate the entry of impurities and oil. In addition to the end face that connects to the short inner wall of the rectangular box 1, other end faces may have through holes or other end faces may have a mesh structure, and their size is usually smaller than the size of the filter screen, to ensure that the oil entering the impurity collection cylinder 4 can flow out normally and that impurities are filtered into the impurity collection cylinder 4. A filter scraper 5 is provided between the end of the impurity collection cylinder 4 and the filter screen roll 3. Oil is injected from the top, and impurities are filtered by the filter screen 2 and remain on the filter screen 2. When the filter screen roll 3 drives the filter screen 2 to rotate towards the impurity collection cylinder 4, the filter scraper 5 scrapes off the impurities remaining on the filter screen 2. The scraped impurities fall into the impurity collection cylinder 4 for storage.
[0034] It should be noted that the long sidewall of the rectangular box 1 is a sidewall with a relatively long length, that is, a sidewall that is parallel to the length direction of the rectangular box, and the inner wall of the long sidewall is the inner wall of the long sidewall. The short sidewall of the rectangular box 1 is a sidewall with a relatively short length, that is, a sidewall that is parallel to the width direction of the rectangular box, and the inner wall of the short sidewall is the inner wall of the short sidewall.
[0035] It should be noted that the top of the oil tank return oil self-cleaning coarse filter device in the embodiment can be open type, and can also be connected with an oil liquid conveying pipe. Figure 3 In the embodiment, the c port is a connecting port for connecting the oil liquid conveying pipe, and the oil liquid with impurities flowing through the double-sided shearing equipment can flow into the oil tank return oil self-cleaning coarse filter device through the open top or through the oil liquid conveying pipe. The bottom of the oil tank return oil self-cleaning coarse filter device can be open type or can be connected with an oil liquid discharge pipe, and the clean oil liquid after filtering can be discharged into the oil tank through the open bottom or through the oil liquid discharge pipe.
[0036] In the embodiment, the impurity collecting cylinder 4 is detachably connected to the inner wall of the short side of the rectangular box body 1, the two filter screen winding cylinders 3 are arranged in the rectangular box body 1 at intervals, and the extension direction of the filter screen winding cylinder 3 is perpendicular to the length direction of the rectangular box body 1. The filter screen 2 is arranged on the two filter screen winding cylinders 3, the filter screen scraper 5 is arranged on the impurity collecting cylinder 4, and one end of the filter screen scraper 5 is in contact with the filter screen 2. In use, the filter screen winding cylinder 3 rotates to drive the filter screen 2 to rotate towards the impurity collecting cylinder 4. The oil liquid with impurities is injected from the top and falls on the filter screen 2. The clean oil liquid passes through the filter screen 2 and is discharged into the oil tank. The impurities are filtered on the filter screen 2. When the impurities rotate to the edge position with the filter screen 2, the larger impurities directly fall into the impurity collecting cylinder 4 under the action of gravity. The smaller impurities may be stuck on the filter screen 2. When the filter screen scraper 5 is rotated to the position of the filter screen scraper 5, the filter screen scraper 5 can scrape the smaller impurities stuck on the filter screen 2 into the impurity collecting cylinder 4. Part of the oil liquid flowing into the impurity collecting cylinder 4 is filtered and discharged into the oil tank through the oil outlet hole formed in the lower part of the impurity collecting cylinder 4, thereby realizing coarse cleaning of the filter screen 2, effectively reducing the problem of impurity accumulation and filter screen blockage of the filter screen 2, reducing the maintenance frequency and maintenance cost of the filter screen, and further improving the sustainable use of the filter in the static pressure lubrication system.
[0037] Optionally, the two impurity collecting cylinders 4 are symmetrically arranged and detachably connected to the opposite two short side inner walls of the rectangular box body 1.
[0038] Specifically, as shown in Figure 1 The impurity collecting cylinder 4 can be provided as two, which are arranged on the opposite two short side inner walls of the rectangular box body 1, respectively. Correspondingly, the distance between the two filter screen winding cylinders 3 and the corresponding short side inner wall is equal to the width of the impurity collecting cylinder 4, and the two filter screen scrapers 5 are arranged between the two filter screen winding cylinders 3 and the impurity collecting cylinder 4. At this time, the filter screen can realize two-side rotation, and the rotation direction is as shown in Figure 3The filter screen roller 3 is driven to rotate to the impurity collecting cylinder 4 on one side to collect impurities and filter oil, and when the impurity collecting cylinder 4 on the one side collects more impurities, the filter screen roller 3 is driven to rotate reversely to rotate to the impurity collecting cylinder 4 on the other side to collect impurities and filter oil. At this time, the impurity collecting cylinder 4 collecting more impurities can be cleaned to achieve sustainable operation of the oil tank return oil self-cleaning coarse filter device. In addition, without maintenance of the oil tank return oil self-cleaning coarse filter device, such as filter screen damage and filter screen scraper 5 falling off, maintenance cost is effectively reduced.
[0039] Optionally, the rectangular box 1 is provided with impurity collecting grooves 6, and two impurity collecting grooves 6 are symmetrically arranged on the inner wall of the short side of the rectangular box 1. An oil overflow outlet is arranged on the impurity collecting groove 6. Each impurity collecting groove 6 is provided with the impurity collecting cylinder 4.
[0040] Specifically, as shown in the figure, Figure 1 After the oil tank return oil self-cleaning coarse filter device filters oil for a long time, the amount and weight of impurities in the impurity collecting cylinder 4 gradually increase. In order to ensure the stability of the impurity collecting cylinder 4 on the rectangular box 1 and avoid falling due to excessive weight, the impurity collecting groove 6 is arranged on the end inner wall of the rectangular box 1. The impurity collecting cylinder 4 can be embedded in the impurity collecting groove 6 to support the impurity collecting cylinder 4. Correspondingly, an oil overflow outlet is arranged at the bottom of the impurity collecting groove 6 corresponding to the oil outlet hole at the bottom of the impurity collecting cylinder 4, so that the clean oil after filtering can be discharged.
[0041] Optionally, the oil tank return oil self-cleaning coarse filter device further comprises a mesh plate 7 arranged at the oil overflow outlet.
[0042] Specifically, as shown in the figure, Figure 1 In order to increase the supporting capacity of the impurity collecting groove 6, each end face of the impurity collecting groove 6 is a steel plate with strong supporting force. That is, the impurity collecting groove 6 has no position for discharging oil except the oil overflow outlet. The oil tank return oil self-cleaning coarse filter device of the embodiment can realize cleaning of the impurity collecting cylinder 4 without stopping. For example, when the impurity collecting cylinder 4 on the other side is used for impurity filtering, the impurity collecting cylinder 4 on the side can be taken out of the impurity collecting groove 6 for cleaning. At this time, the oil with impurities falling from the top can still fall into the impurity collecting groove 6 on the side. In order to avoid accumulation of oil or discharge of impurities from the oil overflow outlet into the oil tank, the mesh plate 7 can be detachably arranged at the oil overflow outlet of the impurity collecting groove 6, and the mesh hole of the mesh plate 7 is smaller than or equal to the mesh hole of the filter screen 2 to filter the impurities in the oil flowing into the impurity collecting groove 6 by mistake. In addition, when the operator forgets to clean the impurity collecting groove 6, the oil tank return oil self-cleaning coarse filter device can also normally filter oil.
[0043] Optionally, the long side wall of the rectangular box 1 is provided with a cleaning door 8, and the impurity collection cylinder 4 is used to be taken out from the rectangular box 1 through the cleaning door 8.
[0044] Specifically, as shown in Figure 2 , the long side wall of the rectangular box is provided with a cleaning door 8 at a position corresponding to the impurity collection groove 6, when the impurity collection cylinder 4 is full of impurities, the cleaning door 8 can be opened, and the impurity collection cylinder 4 can be taken out from the rectangular box 1 for cleaning, which increases the convenience of cleaning the impurity collection cylinder 4.
[0045] Optionally, the cleaning door 8 is provided with an observation window 81.
[0046] Specifically, as shown in Figure 2 , the cleaning door 8 is provided with an observation window 81, the collection of impurities in the impurity collection cylinder 4 can be observed in real time, and the impurity collection cylinder 4 can be cleaned immediately. It should be noted that the observation window 81 can be made of glass, acrylic plate or other transparent anti-collision materials to avoid damage to the observation window 81 caused by collision of impurities.
[0047] Optionally, the oil tank oil return self-cleaning coarse filter device further comprises guide rods 9, which are arranged in the rectangular box 1 in the length direction, and the extension directions of the guide rods 9 are parallel to the extension directions of the filter screen winding drums 3, the planes where the guide rods 9 are located are higher than the planes where the filter screen winding drums 3 are located, and the filter screens 2 are wound on the guide rods 9.
[0048] Specifically, as shown in Figure 1 , two guide rods 9 are rotatably connected to the long side inner wall of the rectangular box 1, and the two guide rods 9 are parallel to the two filter screen winding drums 3, the two guide rods 9 are arranged between the two filter screen winding drums 3 and the corresponding short side inner wall of the rectangular box 1, and the horizontal planes where the two guide rods 9 are located are higher than the horizontal planes where the two filter screen winding drums 3 are located, that is, the height of the guide rod 9 is higher than the height of the filter screen winding drum 3, and the filter screen 2 is wound on the two guide rods 9 and the two filter screen winding drums 3, and the flatness of the filter screen 2 can be adjusted by the guide rod 9.
[0049] In addition, in order to avoid the guide rod 9 and the filter screen winding drum 3 from falling during operation, a curved rod or a curved groove can also be arranged on the long side inner wall of the rectangular box 1, and the specific shape is shown as a curve 1-1 in Figure 1 , forming a first arc-shaped area for rotatably connecting the guide rod 9 and a second arc-shaped area for rotatably connecting the filter screen winding drum 3, so as to further support the guide rod 9 and the filter screen winding drum 3.
[0050] Optionally, the oil tank return oil self-cleaning coarse filtering device further comprises a baffle 10, and two baffle 10 are arranged between the long side inner wall of the rectangular box body 1 and the filter screen 2 respectively.
[0051] Specifically, since the filter screen 2 is rotated in real time and has a certain toughness, a gap is formed between the filter screen 2 and the long side inner wall of the rectangular box body 1 during rotation, or when a large amount of impurities are accumulated on the surface of the filter screen 2, the weight of the impurities causes the filter screen 2 to deform, thereby causing a gap to be formed between the filter screen 2 and the long side inner wall of the rectangular box body 1, and small impurities may pass into the oil tank through the gap. In order to avoid this phenomenon, as shown in Figure 1 and Figure 3 a baffle 10 with a certain thickness is arranged between the filter screen 2 and the long side inner wall of the rectangular box body 1, so as to prevent impurities from passing through the gap when the filter screen 2 rotates and a gap is formed between the filter screen 2 and the long side inner wall of the rectangular box body 1, or to support the filter screen 2 when the filter screen 2 deforms, and also to prevent impurities from passing through the gap.
[0052] Optionally, the oil tank return oil self-cleaning coarse filtering device further comprises a chain wheel 11, a chain 12 and a motor, two chain wheels 11 are connected to two filter screen winding drums 3 respectively, the chain 12 is in driving connection with the two chain wheels 11 respectively, and the motor is in driving connection with one of the filter screen winding drums 3.
[0053] Specifically, as shown in Figure 2 the chain wheel 11 is arranged at the end of the two filter screen winding drums 3 extending out of the rectangular box body 1, the two chain wheels 11 are in driving connection through the chain 12, and the motor is connected with any one of the chain wheels 11, so that when the motor rotates with the chain wheel 11, the other chain wheel 11 is driven through the chain 12, thereby realizing the synchronous rotation of the two filter screen winding drums 3, and reducing the manufacturing and operation cost of the equipment.
[0054] Further, when the filter screen 2 in the oil tank return oil self-cleaning coarse filtering device needs to be replaced, the chain wheel 11 outside the equipment is disconnected from the filter screen winding drum 3, the filter screen winding drum 3 and the guide rod 9 are taken out from the equipment from the top of the oil tank return oil self-cleaning coarse filtering device, a new filter screen 2 is wound on the filter screen winding drum 3 and the guide rod 9, and the installation can be easily completed along the curved slot or curved rod 1-1. After installation is completed, the filter screen winding drum 3 and the guide rod 9 are adjusted, so that the filter screen 2 reaches a proper tension degree, and the replacement of the filter screen 2 is realized.
[0055] The utility model also provides a kind of static pressure lubrication system, comprising the oil tank return oil self-cleaning coarse filtering device described above.
[0056] The static pressure lubrication system of the embodiment has the same beneficial effects as the oil tank return oil self-cleaning coarse filtering device described above, and will not be described here.
[0057] Although the utility model discloses as above, the protection scope of the utility model is not limited to this only.The person skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model, and these changes and modifications will all fall into the protection scope of the utility model.
Claims
1. An oil tank return oil self-cleaning coarse filtering device, characterized in that, It comprises a rectangular box (1), a filter screen (2), a filter screen winding drum (3), an impurity collecting cylinder (4) and a filter screen scraper (5). In the length direction of the rectangular box (1), two filter screen winding drums (3) are arranged in the rectangular box (1) at intervals, and the extension direction of the filter screen winding drum (3) is perpendicular to the length direction of the rectangular box (1), the filter screen (2) is wound on the two filter screen winding drums (3), and the two filter screen winding drums (3) are used to drive the filter screen (2) to move circularly. The impurity collecting cylinder (4) is located in the rectangular box (1) and is detachably connected to the inner wall of the short side of the rectangular box (1), the impurity collecting cylinder (4) is used to collect impurities from the filter screen (2), and the bottom of the impurity collecting cylinder (4) is provided with an oil outlet hole. The filter screen scraper (5) is arranged on the impurity collecting cylinder (4), one end of the filter screen scraper (5) is in contact with the filter screen (2), and the filter screen scraper (5) is used to scrape off the impurities adhered to the filter screen (2) and fall into the impurity collecting cylinder (4). Two impurity collecting cylinders (4) are symmetrically arranged and detachably connected to the opposite two short sides of the rectangular box (1).
2. The oil tank return oil self-cleaning coarse filtering device according to claim 1, characterized in that, Impurity collecting grooves (6) are arranged in the rectangular box (1), two impurity collecting grooves (6) are symmetrically arranged on the short side of the rectangular box (1), an oil overflow outlet is arranged on the impurity collecting groove (6), and the impurity collecting cylinder (4) is arranged in each impurity collecting groove (6).
3. The oil tank return oil self-cleaning coarse filter device according to claim 1, characterized in that, It also comprises a mesh plate (7), which is arranged at the oil overflow outlet.
4. The oil tank return oil self-cleaning coarse filter device according to claim 3, characterized in that, A cleaning door (8) is arranged on the long side wall of the rectangular box (1), and the impurity collecting cylinder (4) is taken out from the rectangular box (1) through the cleaning door (8).
5. The oil tank return oil self-cleaning coarse filter device according to claim 1, characterized in that, An observation window (81) is arranged on the cleaning door (8).
6. The oil tank return oil self-cleaning coarse filter device according to claim 5, characterized in that, It also comprises two guide rods (9) arranged in the rectangular box (1) at intervals in the length direction of the rectangular box (1), the extension direction of the guide rod (9) is parallel to the extension direction of the filter screen winding drum (3), the plane where the two guide rods (9) are located is higher than the plane where the two filter screen winding drums (3) are located, and the filter screen (2) is wound on the two guide rods (9).
7. The oil tank return oil self-cleaning coarse filtration device according to claim 1, characterized by, It also comprises two baffles (10) arranged between the long side inner wall of the rectangular box (1) and the filter screen (2).
8. The oil tank return oil self-cleaning coarse filtration device according to claim 1, characterized by, It also comprises a chain wheel (11), a chain (12) and a motor, two chain wheels (11) are connected to the two filter screen winding drums (3) respectively, the chain (12) is in driving connection with the two chain wheels (11) respectively, and the motor is in driving connection with one of the filter screen winding drums (3).
9. The oil tank return oil self-cleaning coarse filtration device according to claim 1, characterized in that, It comprises the oil tank oil return self-cleaning rough filtering device of any one of claims 1-9.
10. A hydrostatic lubrication system, characterized in that