A self-cleaning hydraulic filter device for hydraulic cylinders

Abstract

This application provides a self-cleaning hydraulic filtration device for hydraulic cylinders, relating to the field of hydraulic oil treatment. This self-cleaning hydraulic filtration device includes a filtration chamber and a multi-stage filtration mechanism. The filtration chamber includes a hinged cavity and a maintenance door. This self-cleaning hydraulic filtration device, through a first and second backwash structure of the backwash mechanism, in conjunction with a rotating mechanism and a screw drive mechanism, can perform targeted backwash cleaning of the impurity filter cartridge and the inclined filter plate. It utilizes liquid pressure impact to replace the traditional physical contact of scrapers, effectively removing surface-adhered impurities and treating fine particles, sticky sludge, and residual contaminants deeply embedded in the pores of the filter media, as well as in areas with complex filter cartridge structures. This avoids the problem of scrapers scratching the precision filter media, and maintains good filtration performance of the filter components even after long-term use, solving the defect of existing devices where incomplete self-cleaning leads to continuous degradation of filtration performance.

Description

Technical Field

[0001] This application relates to the field of hydraulic oil treatment technology, specifically a self-cleaning hydraulic filter device for hydraulic cylinders. Background Technology

[0002] Hydraulic oil is the hydraulic medium used in hydraulic systems that utilize liquid pressure energy. It plays a role in energy transmission, anti-wear, system lubrication, corrosion prevention, rust prevention, and cooling in hydraulic systems. During the maintenance and repair of hydraulic cylinders, a large amount of hydraulic oil is usually generated. The cleanliness of this replaced hydraulic oil cannot be guaranteed. If it is not treated, it cannot be reused, resulting in resource waste. Therefore, hydraulic filtration devices are generally used to filter and recover the hydraulic oil. Existing hydraulic filtration devices generally use a combination of filter cartridges and filter plates to form a multi-stage filtration structure, thereby filtering out hydraulic oil containing particulate impurities.

[0003] A search revealed a hydraulic oil filtration device disclosed in patent number CN222641380U. This device uses a filter cylinder and two sets of filter plates to filter hydraulic oil in stages, improving filtration efficiency. A cleaning component can simultaneously clean impurities adhering to the surfaces of the filter cylinder and the two sets of filter plates (i.e., a rotating motor drives the stirring shaft, causing the scraper and plates to move and scrape away impurities). However, this type of hydraulic oil filtration device has limited cleaning capabilities, and the physical contact and friction between the scraper and the filter cylinder surface can scratch the precision filter media with prolonged use. The scraper typically only removes contaminants from the surface of the filter cylinder or specific tracks. For fine particles deeply embedded in the pores of the filter media, sticky sludge, or complex areas of the filter cylinder structure (such as folds and grooves), the scraper has difficulty reaching them and residues easily remain. This leads to a continuous decline in the filtration performance of the filter cylinder / plate after long-term use.

[0004] The hydraulic oil extraction and recovery device for hydraulic engineering machinery, patent number CN218093653U, improves the filtration and recovery efficiency of hydraulic oil to a certain extent through the coordinated operation of components such as a housing, purification tank, fixed plate, oil pump, delivery pipe, sampling pipe, self-control valve, motor, drive gear, driven gear, rotating rod, first purification screen, second purification screen, and oil outlet pipe. However, this device also faces shortcomings in cleaning ability. After long-term use, impurities easily clog the mesh of its purification screen, affecting the oil flow rate. Furthermore, the device lacks a targeted deep cleaning mechanism and cannot effectively deal with the adhesion of stubborn impurities, causing the filtration performance of the purification screen to gradually decrease with the duration of use.

[0005] In summary, existing hydraulic oil filtration devices generally suffer from limited cleaning capabilities during use. These problems significantly shorten the lifespan of the filter components, requiring frequent downtime for replacement or manual cleaning. This not only increases maintenance costs and workload but also severely impacts the continuity and efficiency of hydraulic oil recovery and treatment. Therefore, a self-cleaning hydraulic filtration device for hydraulic cylinders is proposed. Utility Model Content

[0006] (a) Technical problems to be solved To address the shortcomings of existing technologies, this application provides a self-cleaning hydraulic filter device for hydraulic cylinders, which solves the problems mentioned in the background section.

[0007] (II) Technical Solution To achieve the above objectives, this application provides the following technical solution: a self-cleaning hydraulic filtration device for a hydraulic cylinder, comprising a filtration chamber and a multi-stage filtration mechanism. The filtration chamber includes a hinged cavity and a maintenance door. Two sets of support blocks are fixedly connected to the inner wall of the bottom of the cavity. The cavity is divided into a filtration chamber and a collection chamber by the two sets of support blocks. The multi-stage filtration mechanism includes an impurity filter cartridge disposed inside the filtration chamber and an inclined filter plate supported on the top of the two sets of support blocks. A rotating mechanism that drives the impurity filter cartridge is disposed at the top of the filtration chamber. A backflushing mechanism for cleaning the multi-stage filtration mechanism is disposed inside the filtration chamber. The backflushing mechanism includes a pump body fixedly installed on one side of the top of the filtration chamber, a first backflushing structure for backflushing and cleaning the impurity filter cartridge, and a second backflushing structure for backflushing and cleaning the inclined filter plate.

[0008] By adopting the above technical solution, a compact and fully functional hydraulic oil filtration system can be constructed. The filtration chamber is divided into a filtration chamber and a collection chamber by a support block, making the filtration and collection processes of hydraulic oil independent and avoiding the mixing of unfiltered and filtered oil. The impurity filter cartridge and inclined filter plate in the multi-stage filtration mechanism can filter the hydraulic oil step by step, significantly improving the filtration accuracy. The rotating mechanism can drive the impurity filter cartridge to rotate, increasing the contact area between the hydraulic oil and the filter media and improving the filtration efficiency. The first and second backflushing structures of the backflushing mechanism can clean the impurity filter cartridge and the inclined filter plate respectively, effectively preventing filter media clogging and ensuring long-term stable operation of the device. The hinged maintenance door design facilitates the inspection and maintenance of internal components.

[0009] Preferably, the rotating mechanism includes a first servo motor fixedly installed on the top of the filtration chamber and a connecting ring frame bolted to the impurity filter cartridge. Multiple sets of connecting rods are arranged at equal intervals at the bottom of the connecting ring frame, and a fixed plate is fixedly installed at the bottom of the multiple sets of connecting rods. The output end of the first servo motor passes through the filtration chamber, and the output end of the first servo motor is provided with a drive shaft bolted to the fixed plate.

[0010] By adopting the above technical solution, the first servo motor can stably transmit power to the impurity filter cartridge through the drive shaft, fixed plate, connecting rod, and connecting ring frame, driving the impurity filter cartridge to rotate smoothly. The bolted connection not only facilitates the installation and disassembly of the impurity filter cartridge and the replacement of filter media, but also ensures the stability of the transmission process.

[0011] Preferably, the backflush mechanism further includes a screw drive mechanism that drives the second backflush structure. The screw drive mechanism includes a second servo motor fixedly installed on one side of the bottom of the filter treatment chamber and a sliding groove opened at the bottom of the two sets of support blocks. A sliding plate is slidably arranged inside the sliding groove. The output end of the second servo motor passes through the sliding groove, and a threaded shaft that drives the sliding plate screw is fixedly installed at the output end of the second servo motor.

[0012] By adopting the above technical solution, when the second servo motor drives the threaded shaft to rotate, it can drive the sliding plate to slide smoothly in the sliding groove, thereby driving the second backwash structure to move synchronously, so that the second backwash structure evenly covers all areas of the inclined filter plate, ensuring that there are no dead corners in backwashing cleaning. The setting of the sliding groove provides a stable guide for the sliding plate, preventing the second backwash structure from deviating during the movement, and ensuring the effect of backwashing cleaning.

[0013] Preferably, both the first backflush structure and the second backflush structure are composed of backflush pipes equipped with arrayed backflush nozzles. The first backflush structure is fixedly installed inside one side of the filter chamber, and the second backflush structure is fixedly installed on the upper surface of the sliding plate. The first backflush structure is connected to a set of drainage pipes, and the second backflush structure is connected to another set of drainage pipes through a hydraulic hose.

[0014] By adopting the above technical solution, the array-type backflush nozzle can uniformly spray backflush fluid onto the surface of the impurity filter cartridge and the inclined filter plate. The use of hydraulic hoses adapts to the movement requirements of the second backflush structure, ensures a stable supply of backflush fluid, and makes the operation of the backflush mechanism more flexible and reliable.

[0015] Preferably, a drain pipe for discharging impurities from inside the impurity filter cylinder is fixedly installed on one side of the filter chamber, and a second drain valve port for discharging impurities from the upper surface of the inclined filter plate is connected through the bottom side of the filter chamber. One end of the drain pipe penetrates the bottom of the impurity filter cylinder, and the other end of the drain pipe penetrates the filter chamber. A first drain valve port is provided at the end of the drain pipe that extends out of the filter chamber.

[0016] By adopting the above technical solution, the first drain valve can discharge the impurities in the impurity filter cylinder in a timely manner through the drain pipe, while the second drain valve can directly discharge the impurities on the inclined filter plate, thus realizing the separate discharge of impurities in different filtration stages.

[0017] Preferably, the top of the filter chamber is connected to a liquid inlet, and the bottom side of the collecting chamber is connected to a liquid outlet valve. The bottom end of the liquid inlet penetrates the top opening of the impurity filter cylinder.

[0018] By adopting the above technical solution, the inlet port can accurately guide the hydraulic oil to be filtered into the impurity filter cartridge, ensuring that the hydraulic oil is first filtered by the impurity filter cartridge. The collecting chamber can collect the clean hydraulic oil after multi-stage filtration and then export it through the outlet valve for subsequent recycling.

[0019] (III) Beneficial Effects This application provides a self-cleaning hydraulic filter device for hydraulic cylinders. It has the following beneficial effects: 1. This hydraulic cylinder self-cleaning hydraulic filter device, through the first and second backwash structures of the backwash mechanism, in conjunction with the rotation mechanism and screw drive mechanism, can perform targeted backwash cleaning on the impurity filter cartridge and inclined filter plate respectively. It uses liquid pressure impact to replace the traditional physical contact of scrapers, which can not only remove surface-adhered impurities, but also effectively treat fine particles, sticky sludge, and residual contaminants in the complex structural areas of the filter cartridge that are deeply embedded in the pores of the filter media. It avoids the problem of scrapers scratching the precision filter media, and can maintain the good filtration performance of the filter components even after long-term use, thus solving the defect of the existing device's incomplete self-cleaning leading to continuous degradation of filtration performance.

[0020] 2. This hydraulic cylinder self-cleaning hydraulic filter device features a multi-stage filtration mechanism combined with a rotating mechanism, which keeps the impurity filter cartridge rotating during the filtration process. This improves the contact efficiency between the hydraulic oil and the filter media. Combined with the periodic cleaning by the backflushing mechanism, it avoids the problem of reduced oil flow rate caused by filter media blockage, ensuring efficient filtration.

[0021] 3. The self-cleaning hydraulic filter device of the hydraulic cylinder, by setting the first drain valve port and the second drain valve port separately, can effectively avoid the cross-collection of impurities in the multi-stage filtration mechanism, thereby ensuring that impurities in different filtration stages can be accurately classified and collected, which is more convenient for subsequent centralized treatment or resource utilization of impurities and reduces environmental treatment costs. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall external structure of this application; Figure 2 This is a schematic diagram of the rear view of the external structure of this application; Figure 3 This is a schematic diagram of the half-section external structure of this application; Figure 4 This is a cross-sectional view of the connection between the filter chamber and the first and second backflush structures in this application. Figure 5 This is a schematic diagram of the external structure of the impurity filter cartridge of this application when it is connected to the rotating mechanism; Figure 6 This is a schematic diagram of the external structure of the rotating mechanism of this application.

[0024] In the diagram: 1. Filtration chamber; 101. Chamber body; 102. Maintenance door; 103. Support block; 104. Liquid inlet; 105. Liquid outlet valve; 110. Filtration chamber; 120. Collection chamber; 2. Multi-stage filtration mechanism; 201. Impurity filter cartridge; 202. Drain pipe; 210. Inclined filter plate; 3. Rotation mechanism; 301. First servo motor; 302. Drive shaft; 310. Connecting ring frame; 311. Connecting rod; 312. Fixed plate; 4. Backflush mechanism; 401. Pump body; 402. Liquid extraction pipe; 403. Liquid discharge pipe; 404. First drain valve; 405. Second drain valve; 410. First backflush structure; 420. Second backflush structure; 430. Second servo motor; 431. Sliding plate; 432. Sliding groove. Detailed Implementation

[0025] The present application will be further described in detail below with reference to the accompanying drawings and embodiments.

[0026] Reference Figures 1 to 6This application provides a self-cleaning hydraulic filtration device for hydraulic cylinders, including a filtration chamber 1 and a multi-stage filtration mechanism 2. The filtration chamber 1 includes a hinged cavity 101 and a maintenance door 102. Two sets of support blocks 103 are fixedly connected to the inner wall of the bottom of the cavity 101. The cavity 101 is divided into a filtration chamber 110 and a collection chamber 120 by the two sets of support blocks 103. The multi-stage filtration mechanism 2 includes an impurity filter cylinder 201 disposed inside the filtration chamber 110 and an inclined filter plate 210 supported on the top of the two sets of support blocks 103. A rotating mechanism 3 that drives the impurity filter cylinder 201 is disposed at the top of the filtration chamber 110. A backflushing mechanism 4 for cleaning the multi-stage filtration mechanism 2 is disposed inside the filtration chamber 1. The backflushing mechanism 4 includes a fixed mounting bracket. The pump body 401, the first backflushing structure 410 for backflushing and cleaning the impurity filter cartridge 201, and the second backflushing structure 420 for backflushing and cleaning the inclined filter plate 210 are installed on one side of the top of the filtration chamber 1. By starting the rotating mechanism 3, the impurity filter cartridge 201 can be rotated, so that the hydraulic oil entering the impurity filter cartridge 201 can be initially filtered through the filter material under the action of centrifugal force. The hydraulic oil after initial filtration falls onto the inclined filter plate 210 for secondary filtration. The filtered hydraulic oil enters the collecting chamber 120 for collection. When cleaning is required, the backflushing mechanism 4 is started. The first backflushing structure 410 and the second backflushing structure 420 can backflush the impurity filter cartridge 201 and the inclined filter plate 210 respectively to remove the attached impurities.

[0027] Reference Figure 3 Figure 5 and Figure 6 In one aspect of this embodiment, the rotating mechanism 3 includes a first servo motor 301 fixedly installed on the top of the filtration chamber 1 and a connecting ring frame 310 bolted to the impurity filter cartridge 201. Multiple sets of connecting rods 311 are equidistantly arranged at the bottom of the connecting ring frame 310, and a fixed disk 312 is fixedly installed at the bottom of each set of connecting rods 311. The output end of the first servo motor 301 penetrates the filtration chamber 1, and a transmission shaft 302 bolted to the fixed disk 312 is provided at the output end of the first servo motor 301. When used in this application, by starting the first servo motor 301, its output end drives the transmission shaft 302 to rotate. The transmission shaft 302 transmits power to the impurity filter cartridge 201 through the fixed disk 312, connecting rods 311, and connecting ring frame 310, causing the impurity filter cartridge 201 to rotate at a uniform speed, thus improving filtration efficiency.

[0028] Reference Figures 2 to 4 In one aspect of this embodiment, the pump body 401 is provided with a liquid inlet end with a liquid extraction pipe 402 that communicates with the collecting cavity 120, and an external interface is connected to the outside of the liquid extraction pipe 402. The pump body 401 is provided with two sets of liquid discharge pipes 403 at the liquid outlet end.

[0029] The backflushing mechanism 4 also includes a screw drive mechanism that drives the second backflushing structure 420. The screw drive mechanism includes a second servo motor 430 fixedly installed on one side of the bottom of the filter treatment chamber 1 and a sliding groove 432 opened at the bottom of the two sets of support blocks 103. A sliding plate 431 is slidably arranged inside the sliding groove 432. The output end of the second servo motor 430 passes through the sliding groove 432, and a threaded shaft that drives the sliding plate 431 screw is fixedly installed on the output end of the second servo motor 430. When this application is used, by starting the pump body 401, the clean hydraulic fluid in the collection chamber 120 can be drawn through the liquid extraction pipe 402. Oil (or external cleaning fluid connected via an external interface) is delivered to the first backwash structure 410 and the second backwash structure 420 respectively through two sets of drainage pipes 403. During this process, in conjunction with the drive of the rotating mechanism 3, the first backwash structure 410 can cooperate with the rotation of the impurity filter cartridge 201 to perform stable backwash cleaning on the impurity filter cartridge 201. Furthermore, by starting the second servo motor 430, its output end drives the threaded shaft to rotate. The threaded shaft drives the sliding plate 431 to slide back and forth along the sliding groove 432, thereby driving the second backwash structure 420 to move synchronously, achieving full coverage backwash cleaning of the inclined filter plate 210.

[0030] Reference Figure 3 and Figure 4 In one aspect of this embodiment, both the first backflush structure 410 and the second backflush structure 420 are composed of backflush pipes equipped with arrayed backflush nozzles. The first backflush structure 410 is fixedly installed inside one side of the filter chamber 110, and the second backflush structure 420 is fixedly installed on the upper surface of the sliding plate 431. The first backflush structure 410 is connected in communication with a set of drainage pipes 403, and the second backflush structure 420 is connected in communication with another set of drainage pipes 403 through a hydraulic hose. When this application is used, the backflush delivered through the drainage pipes 403... After the liquid enters the backwash pipes of the first backwash structure 410 and the second backwash structure 420, it forms a high-pressure water flow (or oil flow) through the array of backwash nozzles and is evenly sprayed onto the surface of the impurity filter cartridge 201 and the upper surface of the inclined filter plate 210. The first backwash structure 410 performs fixed-point backwashing on the rotating impurity filter cartridge 201, and achieves all-round cleaning in conjunction with its rotation. The second backwash structure 420 moves with the sliding plate 431 and performs area-by-area backwashing on the inclined filter plate 210. The hydraulic hose ensures the continuity of liquid supply when the second backwash structure 420 moves.

[0031] Reference Figures 1 to 4In one aspect of this embodiment, a drain pipe 202 for discharging impurities from inside the impurity filter cylinder 201 is fixedly installed on one side of the filter chamber 110. A second drain valve port 405 for discharging impurities from the upper surface of the inclined filter plate 210 is connected through the bottom side of the filter chamber 110. One end of the drain pipe 202 penetrates the bottom of the impurity filter cylinder 201, and the other end of the drain pipe 202 penetrates the filter chamber 110. A first drain valve port 404 is provided at the end of the drain pipe 202 that extends out of the filter chamber 110.

[0032] The top of the filter chamber 110 is connected to an inlet port 104, and the bottom side of the collecting chamber 120 is connected to an outlet valve port 105. The bottom end of the inlet port 104 passes through the top opening of the impurity filter cylinder 201. When this application is used, the hydraulic oil to be filtered can be accurately introduced into the impurity filter cylinder 201 through the inlet port 104 to ensure that the filtration process starts from the primary filtration. The filtered clean hydraulic oil is collected in the collecting chamber 120 and can be discharged and recovered by opening the outlet valve port 105. The impurities generated by backflushing cleaning, part of which are in the impurity filter cylinder 201 can be discharged through the drain pipe 202 by opening the first drain valve port 404, and part of which are on the inclined filter plate 210 can be directly discharged by opening the second drain valve port 405, so as to realize the classified collection and discharge of impurities.

[0033] All electrical devices in this plan are powered by an external power source.

[0034] Working principle: When using this self-cleaning hydraulic filter device, the hydraulic oil to be filtered should first be injected into the impurity filter cylinder 201 through the inlet port 104. Start the first servo motor 301 to drive the impurity filter cylinder 201 to rotate. Under the action of centrifugal force, the hydraulic oil passes through the filter material of the impurity filter cylinder 201 to complete the preliminary filtration and remove larger particulate impurities. The hydraulic oil after preliminary filtration falls onto the inclined filter plate 210, and after secondary filtration by the inclined filter plate 210 to remove fine impurities, it finally enters the collection chamber 120 for storage. Clean hydraulic oil can be obtained by opening the outlet valve port 105.

[0035] When the device requires cleaning after a period of operation, the outlet valve 105 is closed, and the pump 401 is started to draw clean hydraulic oil (or external cleaning fluid) from the collecting chamber 120. This clean fluid is then delivered to the first backflushing structure 410 and the second backflushing structure 420 via the drain pipe 403. During this process, the array nozzles of the first backflushing structure 410 spray high-pressure liquid onto the rotating impurity filter cartridge 201, flushing the attached impurities into the impurity filter cartridge 201. Simultaneously, by starting the second servo motor 430, the drive sliding plate 431 moves the second backflushing structure 420 along the sliding groove 432, and its nozzles spray high-pressure liquid onto the inclined filter plate 210, flushing the surface impurities to the edge. After cleaning is completed, the impurities in the impurity filter cartridge 201 are discharged through the drain pipe 202 by opening the first drain valve 404; and the impurities on the inclined filter plate 210 are discharged by opening the second drain valve 405, thus completing the automated operation of the entire filtration and self-cleaning process.

[0036] This design addresses the limited cleaning capabilities commonly found in comparative studies. By employing a backwash mechanism 4 in conjunction with a rotating mechanism 3 and a screw drive mechanism, it achieves highly efficient cleaning of the filter components. Utilizing liquid pressure impact instead of the physical contact of traditional scrapers not only avoids the risk of scraping the precision filter media but also deeply removes fine particles, sticky sludge, and residual impurities from complex areas of the filter cartridge, ensuring thorough cleaning. Simultaneously, the first backwash structure 410, in conjunction with the rotating impurity filter cartridge 201, and the second backwash structure 420, moving with the sliding plate 431, achieve comprehensive cleaning of both, effectively preventing filtration performance degradation caused by filter media clogging. Furthermore, the categorized wastewater discharge design avoids cross-contamination of impurities, further ensuring filtration efficiency and hydraulic oil recovery quality, significantly improving the device's self-cleaning capability and long-term stable operation.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A self-cleaning hydraulic filter device for a hydraulic cylinder, comprising a filter treatment chamber (1) and a multi-stage filter mechanism (2), wherein the filter treatment chamber (1) comprises a hinged cavity (101) and a maintenance door (102), and two sets of support blocks (103) are fixedly connected to the inner wall of the bottom of the cavity (101), and the cavity (101) is divided into a filter chamber (110) and a collection chamber (120) by the two sets of support blocks (103), characterized in that: The multi-stage filtration mechanism (2) includes an impurity filter cartridge (201) disposed inside the filtration chamber (110) and an inclined filter plate (210) supported on the top of two sets of support blocks (103). The top of the filtration chamber (110) is provided with a rotating mechanism (3) that drives the impurity filter cartridge (201). The filtration processing chamber (1) is provided with a backwash mechanism (4) for cleaning the multi-stage filtration mechanism (2). The backwash mechanism (4) includes a pump body (401) fixedly installed on one side of the top of the filtration processing chamber (1), a first backwash structure (410) for backwashing the impurity filter cartridge (201), and a second backwash structure (420) for backwashing the inclined filter plate (210).

2. The self-cleaning hydraulic filter device for a hydraulic cylinder according to claim 1, characterized in that: The rotating mechanism (3) includes a first servo motor (301) fixedly installed on the top of the filter treatment chamber (1) and a connecting ring frame (310) bolted to the impurity filter cartridge (201). Multiple sets of connecting rods (311) are arranged at equal intervals at the bottom of the connecting ring frame (310). A fixed plate (312) is fixedly installed at the bottom of the multiple sets of connecting rods (311). The output end of the first servo motor (301) penetrates the filter treatment chamber (1), and the output end of the first servo motor (301) is provided with a transmission shaft (302) bolted to the fixed plate (312).

3. The self-cleaning hydraulic filter device for a hydraulic cylinder according to claim 1, characterized in that: The pump body (401) has a liquid inlet end provided with a liquid extraction pipe (402) that communicates with the collection chamber (120). An external interface is connected to the outside of the liquid extraction pipe (402). The pump body (401) has two sets of liquid discharge pipes (403) at the liquid outlet end.

4. The self-cleaning hydraulic filter device for a hydraulic cylinder according to claim 3, characterized in that: The backflush mechanism (4) further includes a screw drive mechanism that drives the second backflush structure (420). The screw drive mechanism includes a second servo motor (430) fixedly installed on one side of the bottom of the filter treatment chamber (1) and a sliding groove (432) opened at the bottom of the two sets of support blocks (103). A sliding plate (431) is slidably arranged inside the sliding groove (432). The output end of the second servo motor (430) passes through the sliding groove (432), and a threaded shaft that drives the sliding plate (431) is fixedly installed at the output end of the second servo motor (430).

5. A self-cleaning hydraulic filter device for a hydraulic cylinder according to claim 4, characterized in that: The first backflush structure (410) and the second backflush structure (420) are both composed of backflush pipes with arrayed backflush nozzles installed. The first backflush structure (410) is fixedly installed on one side inside the filter chamber (110), and the second backflush structure (420) is fixedly installed on the upper surface of the sliding plate (431). The first backflush structure (410) is connected to a set of drainage pipes (403), and the second backflush structure (420) is connected to another set of drainage pipes (403) through a hydraulic hose.

6. The self-cleaning hydraulic filter device for a hydraulic cylinder according to claim 1, characterized in that: A drain pipe (202) for discharging impurities from the impurity filter cylinder (201) is fixedly installed on one side of the filter chamber (110). A second drain valve port (405) for discharging impurities from the upper surface of the inclined filter plate (210) is connected through the bottom side of the filter chamber (110). One end of the drain pipe (202) penetrates the bottom of the impurity filter cylinder (201), and the other end of the drain pipe (202) penetrates the filter chamber (110). A first drain valve port (404) is provided at the end of the drain pipe (202) that extends out of the filter chamber (110).

7. The self-cleaning hydraulic filter device for a hydraulic cylinder according to claim 1, characterized in that: The top of the filter chamber (110) is connected to a liquid inlet (104), and the bottom side of the collection chamber (120) is connected to a liquid outlet valve (105). The bottom end of the liquid inlet (104) is inserted into the top opening of the impurity filter cylinder (201).

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