A flow-blocking, impact-resistant, defoaming type oil return filter

Abstract

The present invention discloses a flow-blocking, impact-resistant, defoaming type oil return filter, which relates to the technical field of hydraulic filters and includes: a filter housing, an oil inlet and an oil outlet opened at both ends of the filter housing, and a cavity communicated with the oil inlet and the oil outlet is opened inside the filter housing; a connecting column, the connecting column is fixedly connected inside the cavity, and a spiral track is fixedly connected to the outer wall of the connecting column, and the spiral track is arranged on one side of the oil inlet. By setting a switching filtration mechanism, the present invention filters out impurities in the refluxed hydraulic oil through a filter plate. After a period of time, the filtration channel can be switched through the switching filtration mechanism, so that the filter box can intermittently filter the refluxed hydraulic oil, avoiding the accumulation of impurities on the filter plate and blocking it, thereby improving the filtration efficiency of the hydraulic oil and thus improving the overall practicability of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic filters, and specifically relates to a back oil filter with flow resistance, impact resistance and defoaming function. Background Art

[0002] Hydraulic filters are used to filter various impurities in the hydraulic system and are indispensable devices on the pipeline for conveying the medium. Among them, the back oil filter installed on the return oil pipeline at the end of the hydraulic system is used to filter out the pollutants generated or invaded in the system before returning to the hydraulic oil tank, and is an essential filter for power devices such as hydraulic oil tanks.

[0003] During the use of the existing back oil filters for hydraulic oil, a large amount of filtered impurities are easily accumulated inside, so that the device needs to be shut down regularly by staff to replace the filter screen during use. However, since a large amount of impurities have been accumulated inside the back oil filter during the use of the device, the staff cannot replace and process them in time, and the phenomenon of back oil blockage is likely to occur, thereby affecting the use of the device. Therefore, we provide a back oil filter with flow resistance, impact resistance and defoaming function to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a back oil filter with flow resistance, impact resistance and defoaming function to solve the problem that a large amount of impurities accumulated inside the back oil filter cannot be automatically discharged, thereby affecting the filtering effect of the device.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: A back oil filter with flow resistance, impact resistance and defoaming function, comprising: a filter housing and an oil inlet and an oil outlet opened at both ends of the filter housing, a cavity communicating with the oil inlet and the oil outlet is opened inside the filter housing; a connecting column, the connecting column is fixedly connected inside the cavity, a spiral track is fixedly connected to the outer wall of the connecting column, and the spiral track is arranged on one side of the oil inlet; a switching filtering mechanism is arranged inside the cavity to filter the oil entering the cavity, the switching filtering mechanism includes a partition plate fixedly connected to the inside of the cavity, two filter boxes are fixedly connected to the inside of the partition plate, a conical cylinder is fixedly connected to the discharge port at the bottom of each of the two filter boxes, and a filter plate is fixedly connected to the discharge port inside the conical cylinder; a particle removing mechanism is arranged on the outer wall of the filter housing to remove the particles filtered by the filter plate.

[0006] As a further solution of the present invention: The switching and filtering mechanism further includes a limiting plate fixedly connected to the inner side of the filtering box. A connecting plate is slidably connected to the inner side of the limiting plate, and one end of the connecting plate is set as a slope. One end of the connecting plate is fixedly connected to a first blocking plate, and a circular groove matching the first blocking plate is formed at one end of the first blocking plate. A first rectangular plate is arranged at the bottom of the conical cylinder. A spherical piston rod is fixedly connected to the top of the first rectangular plate, and the top of the spherical piston rod is set as a spherical surface. A blocking component for blocking the filter plate is arranged at the bottom of the conical cylinder.

[0007] As a further solution of the present invention: The blocking component includes a first protective shell fixedly connected to one side of the partition plate. A hydraulic cylinder is installed inside the first protective shell. The output end of the hydraulic cylinder is fixedly connected to a first telescopic rod, and one end of the first telescopic rod penetrates to the outside of the first protective shell. A second telescopic rod is slidably connected to the inside of the first telescopic rod. A second blocking plate is fixedly connected to the top of the second telescopic rod. A compression spring is installed between the second blocking plate and the first telescopic rod. A driving component for driving the other first rectangular plate to move is arranged inside the first protective shell.

[0008] As a further solution of the present invention: The driving component includes a first straight rack fixedly connected to the outer wall of the first telescopic rod. A first rotating rod is rotatably connected to the inside of the first protective shell. A spur gear is fixedly connected to the outer wall of the first rotating rod, and the spur gear meshes with the first straight rack. A second rectangular plate is fixedly connected to one side of the other first rectangular plate. A connecting rod is fixedly connected to the top of the second rectangular plate. A second straight rack is fixedly connected to the top of the connecting rod, and the second straight rack meshes with the spur gear.

[0009] As a further solution of the present invention: The particle removing mechanism includes an impurity suction barrel fixedly connected to the top of the filter housing. A three-way pipe is arranged inside the cavity. The three-way pipe has three ports. Two ports of the three-way pipe are respectively installed on one side of the two filtering boxes, and the other port of the three-way pipe is installed at the feed port of the impurity suction barrel. A third protective shell is fixedly connected to the inside of the impurity suction barrel. A second suction pump is installed inside the third protective shell. The input end of the second suction pump is connected to the three-way pipe. The output end of the second suction pump is fixedly connected to an output pipe. A filter sleeve is threadedly connected to the inside of the impurity suction barrel.

[0010] As a further solution of the present invention: The particle removing mechanism further includes a connecting seat fixedly connected to the inner side of the filtering box. The outer wall of the connecting seat is slidably connected with a limiting seat. The bottom of the limiting seat is fixedly connected with a circular cover plate. The inner side of the connecting seat is rotatably connected with a second rotating rod. A torsion spring is installed between the second rotating rod and the connecting seat. One end of the second rotating rod penetrates to the outside of the connecting seat and is fixedly connected with a rotating plate. One side of the rotating plate is fixedly connected with a third rotating rod. A rectangular groove is opened in the inner side of the circular cover plate. A sliding strip is slidably connected in the rectangular groove, and the sliding strip is rotatably connected with the third rotating rod. A suction pipe is installed in the inner side of the circular cover plate. The output end of the suction pipe is connected with a hose, and one end of the hose is fixedly connected with the three-way pipe. One side of the connecting seat is fixedly connected with a second protective shell with a diameter matching that of the second rotating rod. A discharging assembly for discharging the oil inside the impurity suction barrel is arranged in the inner side of the cavity.

[0011] As a further solution of the present invention: The discharging assembly includes a power rod fixedly connected to the top of the first rectangular plate. The top of the power rod is fixedly connected with a trapezoidal block. A connecting pipe penetrating to the inner side of the cavity is installed at the bottom liquid discharge port of the impurity suction barrel. A connecting strip is fixedly connected in the inner side of the cavity. One end of the connecting strip is fixedly connected with a third telescopic pipe. A fourth telescopic pipe is slidably connected in the third telescopic pipe. One end of the fourth telescopic pipe is fixedly connected with a rectangular block. A telescopic spring is installed between the rectangular block and the connecting strip. One end of the rectangular block is fixedly connected with a spherical rod.

[0012] As a further solution of the present invention: One end of the spherical rod is set as a spherical surface, and one end of the spherical rod is provided with an arched surface.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. By setting up a switching filtering mechanism, impurities in the refluxed hydraulic oil are filtered out by the filter plate. After a period of time, the filtering channel can be switched through the switching filtering mechanism, so that the filtering box can intermittently filter the refluxed hydraulic oil, avoiding the accumulation of impurities on the filter plate and blocking it, thereby improving the filtering efficiency of the hydraulic oil and thus enhancing the overall practicability of the device;

[0015] 2. Through the cooperation of components such as the second suction pump, when one of the two filtering boxes is blocked, the second suction pump can suck the hydraulic oil containing impurities inside the filtered box into the impurity suction barrel for secondary treatment, avoiding waste of resources and ensuring the continuous use of the filtering box;

[0016] 3. By setting up a particle removal mechanism, the circular cover plate can cover the feed inlet on the inner side of the conical cylinder filled with impurities, enabling the suction pipe to be close to the filter plate, thereby improving the suction effect of the impurities on the inner side of the conical cylinder and enhancing the overall practicality of the device;

[0017] 4. Through the cooperation of parts such as the rectangular plate, the rectangular block is reset, so that when the spherical surface on one side of the spherical rod is at the bottom of the arched inclined surface at the bottom of the trapezoidal block, the discharge port at the bottom of the connecting pipe is closed, enabling the device to filter the impurities sucked into the impurity suction bucket subsequently, and after a period of time, the impurities flow back to the inner side of the filter housing, enabling the impurities drawn out from the inside of the filter housing to be automatically processed, ensuring that there is not too much hydraulic oil staying inside the impurity suction bucket, so that the device can be continuously used;

[0018] 5. Through the cooperation of parts such as the spiral track, the spiral track is composed of a dense grid - state filter screen. When the hydraulic oil in the spillway of the hydraulic system flows back through the oil inlet and enters the inside of the filter housing, it is first buffered by the spiral track to reduce the impact caused by the hydraulic oil backflow. In the hydraulic system, the oil in the return oil is prone to generating bubbles (foams) due to factors such as high flow rate and gas - liquid mixing. The role of the grid - state filter screen: The grid filter screen provides multiple contact points in the spiral track. When the oil passes through the grid, the bubbles come into contact with the filter screen surface and are broken. The spiral flow causes the bubbles to be decomposed during the grid contact process, and the gas is released to the outside of the oil, thereby reducing the foam in the oil. Since the spiral track extends the flow path of the oil, the bubbles have more sufficient time to break and separate, reducing the erosion of the subsequent filter elements by the foam and improving the fluidity of the subsequent oil filtration. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a structural schematic diagram of the present invention;

[0020] Figure 2 is a cross - sectional view of the present invention;

[0021] Figure 3 is a cross - sectional view of the switching filter mechanism of the present invention;

[0022] Figure 4 is a cross - sectional view of the particle removal mechanism of the present invention;

[0023] Figure 5 is a structural schematic diagram of the rotating plate of the present invention;

[0024] Figure 6 is a cross - sectional view of the second protective shell of the present invention;

[0025] Figure 7 is a cross - sectional view of the first telescopic rod of the present invention;

[0026] Figure 8 Schematic diagram of the first straight rack structure of the present invention;

[0027] Figure 9 Cross-sectional view of the impurity suction barrel of the present invention;

[0028] Figure 10 Cross-sectional view of the third telescopic tube and the fourth telescopic tube of the present invention.

[0029] In the figure: 1. Filter housing; 2. Oil inlet; 3. Spiral track; 4. Connecting column; 5. Cavity; 6. Oil outlet; 701. Partition board; 702. Filter box; 703. Conical cylinder; 704. First rectangular plate; 705. First protective shell; 706. First plugging plate; 707. Connecting plate; 708. Limiting plate; 709. Spherical piston rod; 710. First telescopic rod; 711. Hydraulic cylinder; 712. Second telescopic rod; 713. Second plugging plate; 714. Compression spring; 715. Filter plate; 716. First straight rack; 717. Straight gear; 718. Second straight rack; 719. First rotating rod; 720. Second rectangular plate; 721. Connecting rod; 801. Impurity suction barrel; 802. Three-way pipe; 803. Rotating plate; 804. Connecting seat; 805. Limiting seat; 806. Sliding strip; 807. Rectangular groove; 808. Circular cover plate; 809. Second rotating rod; 810. Second protective shell; 811. Torsion spring; 812. Second suction pump; 813. Third protective shell; 814. Output pipe; 815. Power rod; 816. Trapezoidal block; 817. Suction pipe; 818. Connecting strip; 819. Spherical rod; 820. Rectangular block; 821. Connecting pipe; 822. Third telescopic tube; 823. Fourth telescopic tube; 824. Telescopic spring; 825. Third rotating rod; 826. Hose; 827. Filter sleeve. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected", "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following describes the embodiments according to the overall structure of the present invention.

[0032] Embodiment 1

[0033] Please refer to Figures 1 to 10 , this embodiment provides a flow-blocking, impact-resistant, defoaming type oil return filter, including: a filter housing 1, and an oil inlet 2 and an oil outlet 6 opened at both ends of the filter housing 1. A cavity 5 communicating with the oil inlet 2 and the oil outlet 6 is opened inside the filter housing 1; a connecting column 4, the connecting column 4 is fixedly connected inside the cavity 5, and a spiral track 3 is fixedly connected to the outer wall of the connecting column 4, and the spiral track 3 is arranged on one side of the oil inlet 2; a switching filtration mechanism, arranged inside the cavity 5 to filter the oil entering the cavity 5. The switching filtration mechanism includes a partition plate 701 fixedly connected inside the cavity 5, and two filter boxes 702 are fixedly connected to the inner side of the partition plate 701. A conical cylinder 703 is fixedly connected to the bottom discharge port of each of the two filter boxes 702, and a filter plate 715 is fixedly connected to the discharge port inside the conical cylinder 703;

[0034] The spiral track 3 is composed of a dense grid-state filter screen. After the hydraulic oil in the spillway of the hydraulic system flows back through the oil inlet 2 and enters the interior of the filter housing 1, it is first buffered by the spiral track 3 to reduce the impact caused by the hydraulic oil backflow. In the hydraulic system, the oil in the return oil is prone to generating bubbles (foams) due to factors such as high flow velocity and gas-liquid mixing. The function of the grid-state filter screen: The grid filter screen provides multiple contact points in the spiral track. When the oil passes through the grid, the bubbles come into contact with the filter screen surface and are broken. The spiral flow causes the bubbles to be decomposed during the grid contact process, and the gas is released to the outside of the oil, thereby reducing the foam in the oil. Since the spiral track 3 extends the flow path of the oil, the bubbles have more sufficient time to break and separate, thereby reducing the erosion of the subsequent filter elements by the foam and improving the fluidity of the subsequent oil filtration;

[0035] When the returned hydraulic oil can pass through the buffer and defoaming operations, it can be filtered by the filter plate 715 inside the filter box 702;

[0036] Embodiment 2

[0037] The switching filter mechanism further includes a limiting plate 708 fixedly connected to the inner side of the filter box 702. A connecting plate 707 is slidably connected to the inner side of the limiting plate 708, and one end of the connecting plate 707 is set as a slope. One end of the connecting plate 707 is fixedly connected to a first blocking plate 706, and a circular groove matching the first blocking plate 706 is opened at one end of the first blocking plate 706. A first rectangular plate 704 is provided at the bottom of the conical cylinder 703. A spherical piston rod 709 is fixedly connected to the top of the first rectangular plate 704. The top of the spherical piston rod 709 is set as a spherical surface. A blocking assembly for blocking the filter plate 715 is provided at the bottom of the conical cylinder 703

[0038] The plugging assembly includes a first protective shell 705 fixedly connected to one side of the partition board 701. A hydraulic cylinder 711 is installed inside the first protective shell 705. The output end of the hydraulic cylinder 711 is fixedly connected to a first telescopic rod 710, and one end of the first telescopic rod 710 penetrates to the outside of the first protective shell 705. A second telescopic rod 712 is slidably connected to the inside of the first telescopic rod 710. A second plugging plate 713 is fixedly connected to the top of the second telescopic rod 712. A compression spring 714 is installed between the second plugging plate 713 and the first telescopic rod 710. A driving assembly for driving the movement of another first rectangular plate 704 is arranged inside the first protective shell 705; the driving assembly includes a first straight rack 716 fixedly connected to the outer wall of the first telescopic rod 710. A first rotating rod 719 is rotatably connected to the inside of the first protective shell 705. A spur gear 717 is fixedly connected to the outer wall of the first rotating rod 719, and the spur gear 717 meshes with the first straight rack 716. A second rectangular plate 720 is fixedly connected to one side of another first rectangular plate 704. A connecting rod 721 is fixedly connected to the top of the second rectangular plate 720. A second straight rack 718 is fixedly connected to the top of the connecting rod 721, and the second straight rack 718 meshes with the spur gear 717;

[0039] The hydraulic cylinder 711 is controlled by a PLC. Through the PLC control, the intermittent start of the hydraulic cylinder 711 can be controlled. When the returned hydraulic oil is filtered in one of the filter tanks 702 for a period of time, the PLC controller controls the hydraulic cylinder 711 to start, so that the output end of the hydraulic cylinder 711 drives the first telescopic rod 710 to move downward, thereby driving the first rectangular plate 704 to move downward, and then driving the spherical piston rod 709 to move downward. When the spherical piston rod 709 is separated from the connecting plate 707, at this time, under the pressure of the returned hydraulic oil outside, the connecting plate 707 is pushed to move towards the circular groove on the side away from the filter tank 702. At this time, the connecting plate 707 can completely open the circular groove inside the filter tank 702, so that the returned hydraulic oil can enter the inside of the filter tank 702 for filtration. When the first telescopic rod 710 moves downward, it will drive the first straight rack 716 to move downward, thereby driving the spur gear 717 to rotate, and then driving the second straight rack 718 to drive the second rectangular plate 720 to move upward, so that another first rectangular plate 704 can move upward, and the other spherical piston rod 709 moves upward to contact the slope on one side of the other connecting plate 707, thereby pushing the other connecting plate 707 to drive the other connecting plate 707 to move towards the circular groove on the side of the other filter tank 702, and the circular groove on one side of the other filter tank 702 can be blocked, so that the filter channel can be switched for use, so that the filter tank 702 can intermittently filter the returned hydraulic oil, thereby improving the overall filtration efficiency of the device, avoiding blockage inside one of the filter tanks 702 and affecting the subsequent filtration effect, and thus improving the overall practicality of the device;

[0040] When the first telescopic rod 710 starts to move downward, since the compression spring 714 is in a compressed state at this time and gradually returns to its original position as the first telescopic rod 710 gradually moves, and when another first blocking plate 706 blocks the circular groove inside another filter box 702, at this time the compression spring 714 returns to its initial position and fits against the bottom of the upper filter plate 715. At this time, the first telescopic rod 710 continues to move downward, thereby driving the second blocking plate 713 to move downward, thus opening the filter port inside the conical cylinder 703 above the hydraulic cylinder 711. And when the first telescopic rod 710 starts to move downward, at the same time, another first rectangular plate 704 can drive another first telescopic rod 710 to move upward. And when another connecting plate 707 blocks the circular groove inside another filter box 702, at this time another second blocking plate 713 below the hydraulic cylinder 711 can block the filter port inside another conical cylinder 703, thereby ensuring that the openings of the two groups of filter boxes 702 will not all be opened, thus facilitating the cleaning of another blocked filter box 702. Through the ingenious design of mechanical components, the alternative use and cleaning of the two groups of filter boxes 702 and the filter ports of the filter plates 715 inside them are realized. When one set of filtering components is in use, the other set can be safely blocked and cleaned, thereby improving the efficiency and reliability of the filtering system. Since there is always one set of filtering components in a closed state, this can prevent impurities or particulate matter from entering the system during the cleaning process, avoiding possible blockage problems, thereby improving the stability and reliability of the device.

[0041] Embodiment 3

[0042] The particle removing mechanism, the particle removing mechanism includes an impurity suction barrel 801 fixedly connected to the top of the filter housing 1. A three-way pipe 802 is arranged inside the cavity 5. The three-way pipe 802 has three ports. Two ports of the three-way pipe 802 are respectively installed on one side of the two filter boxes 702, and the other port of the three-way pipe 802 is installed at the feed port of the impurity suction barrel 801. A third protective shell 813 is fixedly connected inside the impurity suction barrel 801. A second suction pump 812 is installed inside the third protective shell 813. The input end of the second suction pump 812 is connected to the three-way pipe 802. The output end of the second suction pump 812 is fixedly connected with an output pipe 814. A filter sleeve 827 is threadedly connected inside the impurity suction barrel 801;

[0043] The particle removal mechanism further includes a connecting seat 804 fixedly connected to the inner side of the filter box 702. The outer wall of the connecting seat 804 is slidably connected with a limit seat 805. The bottom of the limit seat 805 is fixedly connected with a circular cover plate 808. The inner side of the connecting seat 804 is rotatably connected with a second rotating rod 809. A torsion spring 811 is installed between the second rotating rod 809 and the connecting seat 804. One end of the second rotating rod 809 penetrates to the outside of the connecting seat 804 and is fixedly connected with a rotating plate 803. One side of the rotating plate 803 is fixedly connected with a third rotating rod 825. A rectangular groove 807 is opened in the inner side of the circular cover plate 808. A sliding strip 806 is slidably connected in the rectangular groove 807, and the sliding strip 806 is rotatably connected with the third rotating rod 825. A suction pipe 817 is installed in the inner side of the circular cover plate 808. The output end of the suction pipe 817 is connected with a hose 826, and one end of the hose 826 is fixedly connected with a tee pipe 802. One side of the connecting seat 804 is fixedly connected with a second protective shell 810 with a diameter matching that of the second rotating rod 809. A discharge assembly for discharging the oil in the impurity suction barrel 801 is opened in the inner side of the cavity 5;

[0044] When another first blocking plate 706 at the bottom of the hydraulic cylinder 711 blocks the circular groove in the inner side of another filter box 702, when the output end of the hydraulic cylinder 711 continues to contract, the other spherical piston rod 709 continues to move upward. When the spherical surface at the top of the other spherical piston rod 709 contacts the bottom surface of the other rotating plate 803, at this time, under the action of the other spherical piston rod 709, the other rotating plate 803 will be pushed to rotate along the other second rotating rod 809, thereby driving the other sliding strip 806 to move downward, so that the other circular cover plate 808 moves toward the other conical cylinder 703, so that the other circular cover plate 808 can cover the feed port in the inner side of the other conical cylinder 703, so that the suction pipe 817 can be close to the filter plate 715, thereby improving the suction effect on the impurities in the inner side of the conical cylinder 703 and improving the overall practicability of the device;

[0045] When the spherical piston rod 709 moves downward, the pressure on the torsion spring 811 above the hydraulic cylinder 711 gradually decreases and can push the rotating plate 803 to reset, so that the circular cover plate 808 is reset, so that the feed port at the top of the conical cylinder 703 can be opened, so as to realize the opening and closing of the inner side of the conical cylinder 703, so that the device can more conveniently suck the impurities on the top of the filter plate 715;

[0046] Two of the three ports of the three-way pipe 802 are respectively connected to the ports of a hose 826 through solenoid valves. The two solenoid valves are controlled by a PLC controller to be alternately opened. When the circular cover plate 808 moves to the feed port at the top of the conical cylinder 703 and completely blocks the feed port at the top of the conical cylinder 703, at this time, the PLC controller controls one of the solenoid valves to open, and at the same time, the second suction pump 812 starts to suck the hydraulic oil containing impurities on the filter plate 715 to be cleaned into the impurity suction bucket 801 and filters it through the filter sleeve 827, so that the impurities will not block the filter plate 715, and thus the filter plate 715 can continuously filter the refluxed hydraulic oil, thereby improving the overall practicability of the device;

[0047] The staff can regularly remove and replace the filter sleeve 827 filled with impurities without shutting down the equipment for cleaning operations, thereby improving the overall practicability of the device.

[0048] Embodiment 4

[0049] The discharge assembly includes a power rod 815 fixedly connected to the top of the first rectangular plate 704. The top of the power rod 815 is fixedly connected with a trapezoidal block 816. A connecting pipe 821 penetrating into the inner side of the cavity 5 is installed at the bottom liquid discharge port of the impurity suction bucket 801. A connecting strip 818 is fixedly connected to the inner side of the cavity 5. One end of the connecting strip 818 is fixedly connected with a third telescopic pipe 822. A fourth telescopic pipe 823 is slidably connected to the inner side of the third telescopic pipe 822. One end of the fourth telescopic pipe 823 is fixedly connected with a rectangular block 820. A telescopic spring 824 is installed between the rectangular block 820 and the connecting strip 818. One end of the rectangular block 820 is fixedly connected with a spherical rod 819. One end of the spherical rod 819 is set as a spherical surface, and one end of the spherical rod 819 is provided with an arched surface.

[0050] When the first rectangular plate 704 moves downward, it drives the trapezoidal block 816 to move downward, so that the spherical rod 819 is pushed to move toward the connecting bar 818 under the action of the inclined surface at one end of the trapezoidal block 816, so that the rectangular block 820 can move toward the connecting bar 818. When the spherical rod 819 separates from the inclined surface on one side of the trapezoidal block 816 and abuts against the flat surface on one side of the trapezoidal block 816, the rectangular block 820 can open the discharge port at the bottom of the connecting pipe 821, so that the hydraulic oil filtered again inside the impurity suction barrel 801 can flow back to the inside of the cavity 5, thus ensuring that the hydraulic oil with impurities can continuously enter the inside of the filter sleeve 827, so as not to affect the operation of the device. Since there is a flat surface in the middle of the trapezoidal block 816, the discharge port of the connecting pipe 821 can be in an open state for a certain period of time. When the trapezoidal block 816 separates from the spherical rod 819, at this time, under the action of the telescopic spring 824, the rectangular block 820 will be pushed to reset, so that the discharge port at the bottom of the connecting pipe 821 is closed when the spherical surface on one side of the spherical rod 819 is at the bottom of the arched inclined surface at the bottom of the trapezoidal block 816.

[0051] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent replacements or changes, and should be covered by the protection scope of the present invention.

Claims

1. A flow-blocking, impact-resistant, defoaming type oil return filter, characterized in that, Comprising: A filter housing (1), an oil inlet (2) and an oil outlet (6) opened at both ends of the filter housing (1), and a cavity (5) communicating with the oil inlet (2) and the oil outlet (6) is provided inside the filter housing (1); A connecting column (4), the connecting column (4) is fixedly connected inside the cavity (5), a spiral track (3) is fixedly connected to the outer wall of the connecting column (4), and the spiral track (3) is arranged on one side of the oil inlet (2); A switching filtration mechanism, arranged inside the cavity (5), for filtering the oil entering the cavity (5). The switching filtration mechanism includes a partition plate (701) fixedly connected inside the cavity (5), two filter boxes (702) are fixedly connected inside the partition plate (701), and a conical cylinder (703) is fixedly connected at the bottom discharge port of each of the two filter boxes (702), and a filter plate (715) is fixedly connected at the discharge port inside the conical cylinder (703); A particle removing mechanism, the particle removing mechanism is arranged on the outer wall of the filter housing (1) for removing the particles filtered by the filter plate (715); The switching filtration mechanism further includes a limiting plate (708) fixedly connected inside the filter box (702), a connecting plate (707) is slidably connected inside the limiting plate (708), and one end of the connecting plate (707) is set as a slope. One end of the connecting plate (707) is fixedly connected with a first blocking plate (706), and a circular groove matching the first blocking plate (706) is opened at one end of the first blocking plate (706). A first rectangular plate (704) is arranged at the bottom of the conical cylinder (703), a spherical piston rod (709) is fixedly connected to the top of the first rectangular plate (704), the top of the spherical piston rod (709) is set as a spherical surface, and a blocking assembly for blocking the filter plate (715) is arranged at the bottom of the conical cylinder (703); The particle removing mechanism includes an impurity suction bucket (801) fixedly connected to the top of the filter housing (1), a three-way pipe (802) is arranged inside the cavity (5), the three-way pipe (802) has three ports, wherein two ports of the three-way pipe (802) are respectively installed on one side of the two filter boxes (702), and the other port of the three-way pipe (802) is installed at the feed inlet of the impurity suction bucket (801). A third protective shell (813) is fixedly connected inside the impurity suction bucket (801), a second suction pump (812) is installed inside the third protective shell (813), the input end of the second suction pump (812) is connected to the three-way pipe (802), the output end of the second suction pump (812) is fixedly connected with an output pipe (814), and a filter sleeve (827) is threadedly connected inside the impurity suction bucket (801).

2. The anti-foaming oil return filter with flow-blocking and impact resistance according to claim 1, characterized in that The plugging component includes a first protective shell (705) fixedly connected to one side of the partition board (701). A hydraulic cylinder (711) is installed inside the first protective shell (705). The output end of the hydraulic cylinder (711) is fixedly connected to a first telescopic rod (710), and one end of the first telescopic rod (710) penetrates to the outside of the first protective shell (705). A second telescopic rod (712) is slidably connected inside the first telescopic rod (710). A second plugging plate (713) is fixedly connected to the top of the second telescopic rod (712). A compression spring (714) is installed between the second plugging plate (713) and the first telescopic rod (710). A driving component for driving the other first rectangular plate (704) to move is arranged inside the first protective shell (705).

3. The anti-impact defoaming oil return filter with flow blocking according to claim 2, wherein The driving component includes a first straight rack (716) fixedly connected to the outer wall of the first telescopic rod (710). A first rotating rod (719) is rotatably connected inside the first protective shell (705). A straight gear (717) is fixedly connected to the outer wall of the first rotating rod (719), and the straight gear (717) meshes with the first straight rack (716). A second rectangular plate (720) is fixedly connected to one side of the other first rectangular plate (704). A connecting rod (721) is fixedly connected to the top of the second rectangular plate (720). A second straight rack (718) is fixedly connected to the top of the connecting rod (721), and the second straight rack (718) meshes with the straight gear (717).

4. The anti-foaming oil return filter with flow blocking and impact resistance according to claim 3, wherein The particle removing mechanism further includes a connecting seat (804) fixedly connected to the inner side of the filter box (702). The outer wall of the connecting seat (804) is slidably connected to a limiting seat (805). The bottom of the limiting seat (805) is fixedly connected to a circular cover plate (808). The inner side of the connecting seat (804) is rotatably connected to a second rotating rod (809). A torsion spring (811) is installed between the second rotating rod (809) and the connecting seat (804). One end of the second rotating rod (809) penetrates to the outside of the connecting seat (804) and is fixedly connected to a rotating plate (803). One side of the rotating plate (803) is fixedly connected to a third rotating rod (825). A rectangular groove (807) is formed in the inner side of the circular cover plate (808). A sliding strip (806) is slidably connected to the inner side of the rectangular groove (807), and the sliding strip (806) is rotatably connected to the third rotating rod (825). A suction pipe (817) is installed in the inner side of the circular cover plate (808). The output end of the suction pipe (817) is connected to a flexible pipe (826), and one end of the flexible pipe (826) is fixedly connected to the three-way pipe (802). One side of the connecting seat (804) is fixedly connected to a second protective shell (810) with a diameter matching that of the second rotating rod (809). A discharge assembly for discharging the oil inside the impurity suction barrel (801) is formed in the inner side of the cavity (5).

5. The anti-foaming oil return filter with flow-blocking and impact resistance according to claim 4, characterized in that, The discharge assembly includes a power rod (815) fixedly connected to the top of the first rectangular plate (704). The top of the power rod (815) is fixedly connected to a trapezoidal block (816). A connecting pipe (821) penetrating to the inner side of the cavity (5) is installed at the bottom liquid discharge port of the impurity suction barrel (801). A connecting strip (818) is fixedly connected to the inner side of the cavity (5). One end of the connecting strip (818) is fixedly connected to a third telescopic pipe (822). A fourth telescopic pipe (823) is slidably connected to the inner side of the third telescopic pipe (822). One end of the fourth telescopic pipe (823) is fixedly connected to a rectangular block (820). A telescopic spring (824) is installed between the rectangular block (820) and the connecting strip (818). One end of the rectangular block (820) is fixedly connected to a spherical rod (819).

6. The anti-foaming return oil filter with flow blocking and impact resistance according to claim 5, characterized in that, One end of the spherical rod (819) is provided with a spherical surface, and one end of the spherical rod (819) is provided with an arched surface.

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