Modular quick-release metal-based removable filter core structure for mine hydraulic support

Abstract

The application relates to the technical field of filter elements, and discloses a modular quick-release metal-based detachable and washable filter element structure for mine hydraulic support.The application comprises an outer shell composed of a threaded mounting head, a punched outer cylinder and a tail end connecting cylinder, and a filter element module, a quick-release cover, a driving sealing sleeve and an auxiliary sealing sleeve; the filter element module comprises a filter element body and a filter element sealing ring; the quick-release cover is detachably connected with the tail end connecting cylinder; the driving sealing sleeve and a third sealing ring form a first sealing; when liquid pressure is increased, the driving sealing sleeve drives the auxiliary sealing sleeve to press a fourth sealing ring, thereby forming a second sealing; after the quick-release structure is released, the quick-release cover can be detached, and the filter element module can be pulled out for cleaning or replacement.The application considers quick assembly and disassembly, high-pressure sealing and filter element reuse, and reduces filter element deformation risk and maintenance cost.

Description

Technical Field

[0001] This invention relates to the field of filter element technology, and in particular to a modular quick-release metal-based removable and washable filter element structure for hydraulic support in mines. Background Technology

[0002] Mine hydraulic support equipment typically uses emulsions as the hydraulic transmission medium. To prevent impurities such as coal dust, metal shavings, and sludge in the emulsion from entering the hydraulic valve group, hydraulic cylinder, and other actuators, a filter element assembly is usually installed within the integrated valve block to filter the emulsion. Existing filter element assemblies mostly adopt an integral structure, with the filter element body fixedly connected to the outer shell. When the filter element body becomes clogged or its filtration performance deteriorates, the entire filter element assembly usually needs to be removed and replaced. This not only results in high maintenance costs but also makes it difficult to thoroughly clean the inside of the filter element body, affecting the reusability of the filter element.

[0003] To facilitate filter element disassembly and cleaning, some existing filter element assemblies employ detachable end caps and extractable filter element structures. However, the locking structure between the end cap and the housing, as well as the sealing structures at both ends of the filter element body, are usually independent of each other. Under the high pressure and vibration conditions of mining hydraulic systems, insufficient sealing and compression between the filter element body and the end cap or housing can easily occur due to assembly gaps, pressure fluctuations, and long-term vibration, leading to unfiltered emulsion bypassing from the filter element ends. Increasing the initial compression force to improve the sealing effect can easily increase the stress and deformation risk on the filter element body, while also making end cap disassembly difficult. It is difficult to simultaneously meet the requirements of high-pressure sealing reliability, filter element structural stability, and rapid disassembly and cleaning. Summary of the Invention

[0004] The technical problem this invention aims to solve is that existing filter element structures for hydraulic support in mines suffer from inconvenient disassembly and cleaning, resulting in high maintenance costs during long-term high-pressure operation. Furthermore, existing detachable structures typically employ a single sealing method, making it difficult to balance quick disassembly with high-pressure sealing reliability, and are prone to seal failure due to pressure fluctuations. Simultaneously, increasing the pre-tightening force to improve the sealing effect can easily cause deformation of the filter element itself. Therefore, this invention proposes a modular, quick-disassembly, metal-based, washable filter element structure for hydraulic support in mines.

[0005] To achieve the above objectives, this application adopts the following technical solution: a modular quick-release metal-based detachable and washable filter element structure for mine hydraulic support, comprising a shell, a filter element module, a quick-release cover, an active sealing sleeve, and an auxiliary sealing sleeve. The shell includes a threaded mounting head, a perforated outer cylinder, and a tail-end connecting cylinder connected in sequence. The tail-end connecting cylinder has an opening at one end away from the perforated outer cylinder. The filter element module includes a filter element body inserted into the shell and a filter element sealing ring fixedly disposed at the opening end of the filter element body. The filter element module can be axially removed through the opening of the tail-end connecting cylinder. The quick-release cover is detachably disposed at the opening of the tail-end connecting cylinder. A quick-release locking structure is provided between the quick-release cover and the tail-end connecting cylinder. A through-hole is provided in the middle of the quick-release cover. The filter element body has an internally connected liquid inlet pipe; the filter element sealing ring has an annular groove on the side facing the quick-release cover, and a third sealing ring is installed in the annular groove. The active sealing sleeve is axially movable inside the quick-release cover and slidably sleeved on the outside of the liquid inlet pipe. The end of the active sealing sleeve facing the filter element sealing ring can extend into the annular groove and seal with the third sealing ring; a fourth sealing ring is provided on the side of the filter element sealing ring facing the threaded mounting head. The auxiliary sealing sleeve is axially movable inside the perforated outer cylinder and is detachably connected to the active sealing sleeve. When the active sealing sleeve moves toward the quick-release cover under the pressure of the liquid entering the filter element body, it drives the auxiliary sealing sleeve to move toward the filter element sealing ring, so that the auxiliary sealing sleeve presses against the fourth sealing ring.

[0006] Preferably, the outer periphery of the threaded mounting head is provided with external threads for threaded connection with the integrated valve block, the end face of the threaded mounting head is provided with an internal hexagonal hole, and the outer periphery of the threaded mounting head is provided with a first sealing ring; the outer periphery of the tail end connecting cylinder is provided with a second sealing ring, and the first sealing ring and the second sealing ring are respectively used for sealing cooperation with the filter element mounting cavity in the integrated valve block.

[0007] Preferably, the filter element body is a metal-based cylindrical filter element, with the end of the filter element body facing the threaded mounting head closed and the end facing the quick-release cover open; the filter element sealing ring is fixedly sleeved on the outside of the open end of the filter element body, the third sealing ring is arranged circumferentially along the annular groove, and the fourth sealing ring is arranged on the end face opposite to the filter element sealing ring and the auxiliary sealing sleeve.

[0008] Preferably, a limiting groove is provided on the inner side of the quick-release cover, and one end of the active sealing sleeve is axially slidably disposed in the limiting groove; a first spring groove is provided inside the quick-release cover, and a first spring is provided in the first spring groove. One end of the first spring abuts against the inner wall of the first spring groove, and the other end abuts against the active sealing sleeve, so as to push the active sealing sleeve toward the filter element sealing ring.

[0009] Preferably, the active sealing sleeve is arranged around the liquid inlet pipe, and the inner wall of the active sealing sleeve is slidably sealed to the outer wall of the liquid inlet pipe. The side of the active sealing sleeve facing the filter element body forms an annular pressure-bearing surface that communicates with the inner cavity of the filter element body. The annular pressure-bearing surface is used to drive the active sealing sleeve to compress the first spring and move towards the quick-release cover when the liquid pressure increases.

[0010] Preferably, a second spring groove is provided at one end of the inner cavity of the punched outer cylinder near the tail end connecting cylinder. The auxiliary sealing sleeve is axially slidably disposed in the second spring groove. A second return spring is provided in the second spring groove. One end of the second return spring abuts against the inner wall of the second spring groove, and the other end abuts against the auxiliary sealing sleeve to ensure that the auxiliary sealing sleeve and the fourth sealing ring fit tightly together.

[0011] Preferably, the active sealing sleeve has multiple second locking blocks that slide circumferentially inside; the auxiliary sealing sleeve has hooks on its outer periphery that correspond one-to-one with the second locking blocks.

[0012] Preferably, the inner wall of the tail end connecting cylinder is provided with a snap-fit ​​groove, and the quick-release cover is provided with a first locking block corresponding to the snap-fit ​​groove in the radial direction. When the first locking block extends out of the quick-release cover, it snaps into the snap-fit ​​groove to prevent the quick-release cover from axially disengaging from the tail end connecting cylinder.

[0013] Preferably, the quick-release cover has an unlocking hole on its outer side, and the active sealing sleeve has multiple movable grooves distributed circumferentially inside. The unlocking hole communicates with the movable grooves, and each movable groove has an unlocking linkage rod slidably installed in it. A second spring is also installed in the movable groove to abut against the unlocking linkage rod. The unlocking linkage rod is fixedly connected to the second locking block and slides with the first locking block. When the unlocking linkage rod is pushed by an external force, it drives the first locking block to exit the locking groove and simultaneously drives the second locking block to exit the corresponding hook, thereby releasing the connection between the quick-release cover and the tail end connecting cylinder, as well as the transmission connection between the active sealing sleeve and the auxiliary sealing sleeve.

[0014] Preferably, it also includes an integrated valve block and an interface valve block disposed on the top of the integrated valve block. The housing, filter element module, quick-release cover, active sealing sleeve and auxiliary sealing sleeve together constitute the filter element assembly. The integrated valve block is provided with a filter element mounting cavity adapted to the filter element assembly. The threaded mounting head is threadedly connected to the filter element mounting cavity. The perforated outer cylinder and the tail end connecting cylinder are located in the filter element mounting cavity. The liquid flow channel in the interface valve block is connected to the inlet pipe and the filtered liquid flow area outside the perforated outer cylinder.

[0015] The technical effects and advantages of this invention are as follows: This invention assembles the filter element body and the filter element sealing ring into a filter element module that can be pulled out as a whole. By utilizing the quick-release locking structure between the quick-release cover and the tail end connecting cylinder, the filter element module can be removed after the quick-release cover is unlocked. This facilitates the cleaning, inspection and reuse of the metal-based filter element body, reduces the frequency of replacing the entire filter element, and lowers maintenance costs and downtime.

[0016] This invention utilizes an active sealing sleeve and a third sealing ring to form the first seal between the filter module and the quick-release cover. When the liquid pressure increases, the active sealing sleeve drives the auxiliary sealing sleeve to press the fourth sealing ring, forming the second seal between the filter module and the perforated outer cylinder. This allows the sealing effect to increase with the increase of internal pressure. The liquid pressure mainly acts on the active sealing sleeve and the filter sealing ring, avoiding the need to continuously increase the axial preload of the filter body to achieve a seal, thereby reducing the risk of the filter body being deformed by pressure. At the same time, the unlocking linkage rod can simultaneously release the lock between the quick-release cover and the tail end connecting cylinder, as well as the transmission connection between the active sealing sleeve and the auxiliary sealing sleeve, improving disassembly efficiency. Attached Figure Description

[0017] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts: Figure 1 This is a schematic diagram of the overall structure of the present invention installed on the integrated valve block; Figure 2 This is a schematic diagram of the overall structure of the filter element assembly of the present invention; Figure 3 This is an exploded structural diagram of the filter element assembly of the present invention; Figure 4 This is a cross-sectional view of the filter element assembly of the present invention; Figure 5 for Figure 4 A magnified schematic diagram of the partial structure at point A in the middle; Figure 6 This is an exploded structural diagram of the quick-release cap, active sealing sleeve, and auxiliary sealing sleeve of the present invention. Figure 7 This is a cross-sectional exploded view of the quick-release cap, active sealing sleeve, and auxiliary sealing sleeve of the present invention.

[0018] Legend: 1. Integrated valve block; 2. Interface valve block; 3. Threaded mounting head; 4. Perforated outer cylinder; 5. Tail end connecting cylinder; 6. First sealing ring; 7. Second sealing ring; 8. Filter element body; 9. Snap-fit ​​groove; 10. Quick-release cover; 11. Liquid inlet pipe; 12. Unlocking hole; 13. First locking block; 14. First spring groove; 15. First spring; 16. Limiting groove; 17. Active sealing sleeve; 18. Movable groove; 19. Second spring; 20. Second locking block; 21. Second spring groove; 22. Second return spring; 23. Auxiliary sealing sleeve; 24. Hook; 25. Filter element sealing ring; 26. Third sealing ring; 27. Fourth sealing ring; 28. Unlocking linkage rod. Detailed Implementation

[0019] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0020] Reference Figures 1-7 As shown, the present invention provides a technical solution: a modular quick-release metal-based detachable and washable filter element structure for mine hydraulic support, including an integrated valve block 1, an interface valve block 2 disposed on the top of the integrated valve block 1, and a filter element assembly installed inside the integrated valve block 1. The integrated valve block 1 is provided with a filter element mounting cavity adapted to the filter element assembly, and the interface valve block 2 is provided with a liquid flow channel, which is connected to the liquid inlet area and the filtered liquid flow area of ​​the filter element assembly respectively.

[0021] The filter element assembly includes a housing, a filter element module, a quick-release cover 10, an active sealing sleeve 17, and an auxiliary sealing sleeve 23. The housing includes a threaded mounting head 3, a perforated outer cylinder 4, and a tail end connecting cylinder 5, which are fixedly connected in sequence along the axial direction. The interiors of the threaded mounting head 3, the perforated outer cylinder 4, and the tail end connecting cylinder 5 together form a space for accommodating the filter element module. The end of the tail end connecting cylinder 5 away from the perforated outer cylinder 4 is provided with an opening, through which the filter element module can be installed into the housing or removed axially from the housing.

[0022] The threaded mounting head 3 has an external thread on its outer periphery. The threaded mounting head 3 is threadedly connected to the filter element mounting cavity in the integrated valve block 1 through the external thread. The outer end face of the threaded mounting head 3 has an internal hexagonal hole. When disassembling and assembling the filter element assembly, the threaded mounting head 3, the punched outer cylinder 4 and the tail end connecting cylinder 5 fixedly connected to it can be rotated as a whole by using an internal hexagonal tool. The outer periphery of the threaded mounting head 3 is provided with a first sealing ring 6, and the outer periphery of the tail end connecting cylinder 5 is provided with a second sealing ring 7. The first sealing ring 6 and the second sealing ring 7 respectively seal and cooperate with the corresponding inner wall of the filter element mounting cavity.

[0023] The perforated outer cylinder 4 is a cylindrical metal component. The cylinder wall of the perforated outer cylinder 4 has multiple liquid passage holes distributed along the circumferential and axial directions. One end of the perforated outer cylinder 4 is fixedly connected to the threaded mounting head 3, and the other end is fixedly connected to the tail end connecting cylinder 5. The perforated outer cylinder 4 is used to protect the filter element body 8 set inside it, and to allow the filtered liquid passing through the filter element body 8 to enter the filtered liquid flow area in the integrated valve block 1 through the liquid holes.

[0024] The filter element module includes a filter element body 8 and a filter element sealing ring 25. The filter element body 8 is a metal-based cylindrical filter element. The filter element body 8 can be made of metal woven mesh, metal sintered mesh, metal fiber felt or multi-layer metal composite filter material. The end of the filter element body 8 facing the threaded mounting head 3 is closed, and the end facing the quick-release cover 10 is open. The liquid to be filtered enters the interior of the filter element body 8 through the open end of the filter element body 8 and passes through the metal filter medium from the inside to the outside of the filter element body 8 to complete the filtration.

[0025] The filter element sealing ring 25 is fixedly sleeved on the outside of the open end of the filter element body 8. The filter element sealing ring 25 and the filter element body 8 together form a filter element module that can be installed and removed as a whole. The filter element sealing ring 25 is made of metal material with corresponding structural strength and is used to withstand the sealing force applied by the active sealing sleeve 17 and the auxiliary sealing sleeve 23, so as to avoid the sealing force being directly concentrated on the metal filter medium of the filter element body 8.

[0026] The filter element sealing ring 25 has an annular groove on the side facing the quick-release cover 10. The annular groove surrounds the opening of the filter element body 8. A third sealing ring 26 is provided in the annular groove. The third sealing ring 26 is continuously arranged along the circumference of the annular groove. The third sealing ring 26 is used to seal with the end of the active sealing sleeve 17 to form a seal between the filter element module and one side of the quick-release cover 10.

[0027] A fourth sealing ring 27 is provided on the side of the filter element sealing ring 25 facing the threaded mounting head 3. The fourth sealing ring 27 is located between the end faces of the filter element sealing ring 25 and the auxiliary sealing sleeve 23. The fourth sealing ring 27 is used to seal with the auxiliary sealing sleeve 23 to form a seal between the filter element module and one side of the perforated outer cylinder 4. The third sealing ring 26 and the fourth sealing ring 27 are located on the axial sides of the filter element sealing ring 25, respectively.

[0028] The quick-release cover 10 is detachably inserted into the opening of the tail end connecting cylinder 5. A quick-release locking structure is provided between the quick-release cover 10 and the tail end connecting cylinder 5. The inner wall of the tail end connecting cylinder 5 is provided with a snap-fit ​​groove 9. The interior of the quick-release cover 10 is radially slidably provided with a first locking block 13 corresponding to the snap-fit ​​groove 9. Multiple first locking blocks 13 are provided along the circumference of the quick-release cover 10. When the first locking block 13 extends out of the quick-release cover 10, it snaps into the snap-fit ​​groove 9 to restrict the quick-release cover 10 from axially disengaging from the tail end connecting cylinder 5. After the first locking block 13 exits the snap-fit ​​groove 9, the quick-release cover 10 can be removed axially from the opening of the tail end connecting cylinder 5.

[0029] A liquid inlet pipe 11 is provided through the middle of the quick-release cover 10. One end of the liquid inlet pipe 11 is connected to the liquid inlet channel in the interface valve block 2, and the other end extends into the filter element assembly and is connected to the inner cavity of the filter element body 8. The emulsion to be filtered can enter the liquid inlet pipe 11 through the liquid inlet channel in the interface valve block 2 and enter the filter element body 8 through the liquid inlet pipe 11.

[0030] The quick-release cover 10 has a limiting groove 16 on its inner side. One end of the active sealing sleeve 17 is axially slidably disposed in the limiting groove 16. The limiting groove 16 is used to limit the radial offset of the active sealing sleeve 17 and limit the active sealing sleeve 17 to move axially along the filter element assembly. The active sealing sleeve 17 is annular in shape and surrounds the liquid inlet pipe 11. The inner wall of the active sealing sleeve 17 is slidably sealed to the outer wall of the liquid inlet pipe 11.

[0031] One end of the active sealing sleeve 17 facing the filter element sealing ring 25 corresponds to the annular groove on the filter element sealing ring 25. After the quick-release cover 10 is installed in place, the end of the active sealing sleeve 17 facing the filter element sealing ring 25 extends into the annular groove and seals with the third sealing ring 26 set in the annular groove. When the active sealing sleeve 17 moves axially, its end always remains in sealing contact with the third sealing ring 26.

[0032] The quick-release cover 10 has a first spring groove 14 inside, which surrounds the active sealing sleeve 17. A first spring 15 is provided inside the first spring groove 14. One end of the first spring 15 abuts against the inner wall of the first spring groove 14, and the other end abuts against the active sealing sleeve 17. The first spring 15 is used to push the active sealing sleeve 17 toward the filter element sealing ring 25, so that the end of the active sealing sleeve 17 is kept inserted into the annular groove and presses the third sealing ring 26.

[0033] The active sealing sleeve 17 forms an annular pressure-bearing surface that communicates with the inner cavity of the filter element body 8 on the side facing the filter element body 8. After the filtered liquid enters the filter element body 8 through the liquid inlet pipe 11, the liquid pressure acts on the annular pressure-bearing surface of the active sealing sleeve 17. When the liquid pressure is low, the first spring 15 keeps the active sealing sleeve 17 in a position close to the filter element sealing ring 25, and the active sealing sleeve 17 and the third sealing ring 26 form a basic seal.

[0034] When the liquid pressure inside the filter element body 8 increases and the axial force generated by the liquid pressure acting on the annular pressure surface is greater than the elastic force of the first spring 15, the active sealing sleeve 17 compresses the first spring 15 and moves towards the quick-release cover 10. The movement stroke of the active sealing sleeve 17 is limited by the limiting groove 16, and the length of the active sealing sleeve 17 extending into the annular groove is greater than its axial movement stroke, so as to ensure that the active sealing sleeve 17 still maintains a sealing fit with the third sealing ring 26 after it moves.

[0035] The inner end of the punched outer cylinder 4 near the tail end connecting cylinder 5 is provided with a second spring groove 21. The second spring groove 21 is annular and surrounds the filter element body 8. The auxiliary sealing sleeve 23 is axially slidably disposed in the second spring groove 21. The auxiliary sealing sleeve 23 is located on the side of the filter element sealing ring 25 facing the threaded mounting head 3 and is disposed opposite to the fourth sealing ring 27.

[0036] A second return spring 22 is provided in the second spring groove 21. One end of the second return spring 22 abuts against the inner wall of the second spring groove 21, and the other end abuts against the auxiliary sealing sleeve 23.

[0037] A separable transmission structure is provided between the active sealing sleeve 17 and the auxiliary sealing sleeve 23. Multiple movable grooves 18 are distributed circumferentially inside the active sealing sleeve 17. Each movable groove 18 is provided with a second spring 19, a second locking block 20 and an unlocking linkage rod 28. The second locking block 20 can slide radially along the movable groove 18. The second spring 19 abuts against the unlocking linkage rod 28 and is used to keep the unlocking linkage rod 28 and the second locking block 20 fixedly connected to it in the extended position.

[0038] The outer periphery of the auxiliary sealing sleeve 23 is provided with hooks 24 that correspond one-to-one with the second locking block 20. The hooks 24 are fixedly connected to the auxiliary sealing sleeve 23. When the second locking block 20 extends out of the movable groove 18, it engages with the corresponding hook 24, so that a separable transmission connection is formed between the active sealing sleeve 17 and the auxiliary sealing sleeve 23.

[0039] When the active sealing sleeve 17 moves toward the quick-release cover 10 under the action of liquid pressure, the second locking block 20 set inside the active sealing sleeve 17 moves synchronously with the active sealing sleeve 17. The second locking block 20 drives the auxiliary sealing sleeve 23 toward the filter element sealing ring 25 through the hook 24 that engages with it, so that the auxiliary sealing sleeve 23 further presses the fourth sealing ring 27.

[0040] When the liquid pressure increases, the seal between the active sealing sleeve 17 and the third sealing ring 26 remains effective. At the same time, the auxiliary sealing sleeve 23 applies additional pressure to the fourth sealing ring 27, thereby forming seals on both sides of the filter element sealing ring 25. The greater the liquid pressure, the greater the axial force on the active sealing sleeve 17, and the more obvious the traction effect on the auxiliary sealing sleeve 23 through the hook 24, thereby improving the sealing reliability at the fourth sealing ring 27.

[0041] Both the third sealing ring 26 and the fourth sealing ring 27 act on the filter element sealing ring 25. The filter element sealing ring 25, as a rigid load-bearing component, bears the force applied by the active sealing sleeve 17 and the auxiliary sealing sleeve 23. The filter element body 8 does not need to increase its own axial compression to obtain a sealing effect, thereby reducing the risk of the filter element body 8 being deformed under pressure and the filter pore size changing.

[0042] The quick-release cover 10 has multiple unlocking holes 12 arranged circumferentially on its outer side. The unlocking holes 12 are respectively connected to the corresponding movable grooves 18 inside the active sealing sleeve 17. Each movable groove 18 is slidably provided with an unlocking linkage rod 28. The unlocking linkage rod 28 is fixedly connected to the corresponding second locking block 20 and slidably engaged with the first locking block 13.

[0043] When the operator moves the unlocking linkage rod 28 into the movable groove 18 through the unlocking hole 12, the unlocking linkage rod 28 overcomes the elastic force of the second spring 19 and drives the second locking block 20 to retract into the movable groove 18, so that the second locking block 20 disengages from the corresponding hook 24, thereby releasing the transmission connection between the active sealing sleeve 17 and the auxiliary sealing sleeve 23.

[0044] When assembling this invention, the filter module consisting of the filter body 8 and the filter sealing ring 25 is inserted into the housing through the opening of the tail end connecting cylinder 5, so that the side of the filter sealing ring 25 facing the threaded mounting head 3 corresponds to the auxiliary sealing sleeve 23 and the fourth sealing ring 27.

[0045] Then, the quick-release cover 10 is inserted into the opening of the tail end connecting cylinder 5. During the insertion of the quick-release cover 10, the end of the active sealing sleeve 17 enters the annular groove of the filter element sealing ring 25 and seals with the third sealing ring 26. The second locking block 20 engages with the hook 24 on the auxiliary sealing sleeve 23. The first locking block 13 extends radially and engages with the engagement groove 9 on the inner wall of the tail end connecting cylinder 5, thereby completing the locking of the quick-release cover 10 and the transmission connection between the active sealing sleeve 17 and the auxiliary sealing sleeve 23.

[0046] When filtering, the emulsion to be filtered enters the inlet pipe 11 through the liquid flow channel in the interface valve block 2, and then enters the filter element body 8 through the inlet pipe 11. The emulsion passes through the metal filter medium from the inside to the outside of the filter element body 8. Impurities such as coal powder, metal debris and sludge in the emulsion are trapped on the inside of the filter element body 8. The filtered emulsion enters the filtrate flow area in the integrated valve block 1 through the liquid passage on the perforated outer cylinder 4, and is discharged through the corresponding liquid flow channel in the interface valve block 2.

[0047] When the internal pressure of the filter element body 8 is within the normal range, the first spring 15 pushes the active sealing sleeve 17 to maintain a sealing fit with the third sealing ring 26.

[0048] When the internal pressure of the filter element body 8 increases, the liquid pressure acts on the annular pressure-bearing surface of the active sealing sleeve 17 and pushes the active sealing sleeve 17 to move towards the quick-release cover 10. The active sealing sleeve 17 drives the auxiliary sealing sleeve 23 to move towards the filter element sealing ring 25 through the second locking block 20 and the hook 24, so that the auxiliary sealing sleeve 23 further presses the fourth sealing ring 27. At the same time, the active sealing sleeve 17 still maintains a sealing fit with the third sealing ring 26, thereby forming a double-layer seal that is strengthened as the liquid pressure increases.

[0049] When it is necessary to disassemble and clean the filter element body 8, first stop the operation of the hydraulic system and release the internal pressure of the filter element assembly. Then, move the unlocking linkage rod 28 through the unlocking hole 12 to make the second locking block 20 disengage from the hook 24 and the first locking block 13 disengage from the snap-fit ​​groove 9. After the quick-release cover 10 is disconnected from the tail end connecting cylinder 5, remove the quick-release cover 10 together with the liquid inlet pipe 11, the active sealing sleeve 17, the first spring 15 and related locking components from the opening of the tail end connecting cylinder 5.

[0050] After the quick-release cover 10 is removed, the filter element body 8 and the filter element sealing ring 25 fixed to the opening end of the filter element body 8 can be used as a complete filter element module and pulled out axially through the opening of the tail end connecting cylinder 5. The pulled-out filter element module can be cleaned by reverse flushing, soaking, ultrasonic cleaning or other methods suitable for metal filter media. After cleaning is completed and the condition of the filter element body 8, the third sealing ring 26 and the fourth sealing ring 27 is checked, it can be reinstalled into the housing in reverse order for continued use.

[0051] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A modular, quick-release, metal-based, washable filter element structure for hydraulic support in mines, characterized in that, The device includes a housing, a filter element module, a quick-release cover, an active sealing sleeve, and an auxiliary sealing sleeve. The housing comprises a threaded mounting head, a perforated outer cylinder, and a tail-end connecting cylinder, which are sequentially fixedly connected. The tail-end connecting cylinder has an opening at its end away from the perforated outer cylinder. The filter element module includes a filter element body inserted into the housing and a filter element sealing ring fixedly disposed at the opening end of the filter element body. The filter element module can be axially removed through the opening of the tail-end connecting cylinder. The quick-release cover is detachably disposed at the opening of the tail-end connecting cylinder, and a quick-release locking structure is provided between the quick-release cover and the tail-end connecting cylinder. A liquid inlet pipe communicating with the interior of the filter element body is provided through the middle of the quick-release cover. The filter element sealing ring is positioned on the side facing the quick-release cover. The filter element has an annular groove, within which a third sealing ring is disposed. The active sealing sleeve is axially movably disposed inside the quick-release cover and slidably sleeved on the outside of the inlet pipe. One end of the active sealing sleeve facing the filter element sealing ring can extend into the annular groove and seal with the third sealing ring. A fourth sealing ring is disposed on the side of the filter element sealing ring facing the threaded mounting head. An auxiliary sealing sleeve is axially movably disposed inside the perforated outer cylinder and is detachably connected to the active sealing sleeve. When the active sealing sleeve moves toward the quick-release cover under the pressure of the liquid entering the filter element body, it drives the auxiliary sealing sleeve to move toward the filter element sealing ring, so that the auxiliary sealing sleeve presses against the fourth sealing ring.

2. The modular quick-release metal-based removable and washable filter element structure for mine hydraulic support according to claim 1, characterized in that: The threaded mounting head has an external thread on its outer periphery for threaded connection with the integrated valve block, and an internal hexagonal hole on its end face. A first sealing ring is provided on the outer periphery of the threaded mounting head. A second sealing ring is provided on the outer periphery of the tail end connecting cylinder. The first sealing ring and the second sealing ring are respectively used to seal and cooperate with the filter element mounting cavity in the integrated valve block.

3. The modular quick-release metal-based removable and washable filter element structure for mine hydraulic support according to claim 1, characterized in that: The filter element body is a metal-based cylindrical filter element. The end of the filter element body facing the threaded mounting head is closed, and the end facing the quick-release cover is open. The filter element sealing ring is fixedly sleeved on the outside of the open end of the filter element body. The third sealing ring is arranged circumferentially along the annular groove. The fourth sealing ring is arranged on the end face of the filter element sealing ring opposite to the auxiliary sealing sleeve.

4. The modular quick-release metal-based removable and washable filter element structure for mine hydraulic support according to claim 1, characterized in that: The quick-release cover has a limiting groove on its inner side, and one end of the active sealing sleeve is axially slidably disposed in the limiting groove; the quick-release cover has a first spring groove inside, and a first spring is disposed in the first spring groove. One end of the first spring abuts against the inner wall of the first spring groove, and the other end abuts against the active sealing sleeve, so as to push the active sealing sleeve to move toward the filter element sealing ring.

5. The modular quick-release metal-based removable and washable filter element structure for mine hydraulic support according to claim 4, characterized in that: The active sealing sleeve is arranged around the liquid inlet pipe, and the inner wall of the active sealing sleeve is slidably sealed to the outer wall of the liquid inlet pipe. The active sealing sleeve forms an annular pressure-bearing surface on the side facing the filter element body that communicates with the inner cavity of the filter element body. The annular pressure-bearing surface is used to drive the active sealing sleeve to compress the first spring and move towards the quick-release cover when the liquid pressure increases.

6. The modular quick-release metal-based removable and washable filter element structure for mine hydraulic support according to claim 1, characterized in that: A second spring groove is provided inside the perforated outer cylinder at one end near the tail end connecting cylinder. The auxiliary sealing sleeve is axially slidably disposed in the second spring groove. A second return spring is provided in the second spring groove. One end of the second return spring abuts against the inner wall of the second spring groove, and the other end abuts against the auxiliary sealing sleeve to ensure that the auxiliary sealing sleeve and the fourth sealing ring fit tightly together.

7. The modular quick-release metal-based removable and washable filter element structure for mine hydraulic support according to claim 1, characterized in that: The active sealing sleeve has multiple second locking blocks that slide circumferentially inside; the auxiliary sealing sleeve has hooks on its outer periphery that correspond one-to-one with the second locking blocks.

8. The modular quick-release metal-based removable and washable filter element structure for mine hydraulic support according to claim 7, characterized in that: The inner wall of the tail end connecting cylinder is provided with a snap-fit ​​groove, and the quick-release cover is provided with a first locking block corresponding to the snap-fit ​​groove in the radial direction. When the first locking block extends out of the quick-release cover, it engages with the snap-fit ​​groove to prevent the quick-release cover from axially disengaging from the tail end connecting cylinder.

9. The modular quick-release metal-based removable and washable filter element structure for mine hydraulic support according to claim 8, characterized in that: The quick-release cover has an unlocking hole on its outer side. The active sealing sleeve has multiple movable grooves distributed circumferentially inside. The unlocking hole communicates with the movable grooves. Each movable groove has an unlocking linkage rod slidably disposed therein. A second spring is also disposed in the movable groove to abut against the unlocking linkage rod. The unlocking linkage rod is fixedly connected to the second locking block and slidably engaged with the first locking block. When the unlocking linkage rod is pushed by an external force, it drives the first locking block to exit the snap-fit ​​groove and simultaneously drives the second locking block to exit the corresponding hook, thereby releasing the connection between the quick-release cover and the tail end connecting cylinder and the transmission connection between the active sealing sleeve and the auxiliary sealing sleeve.

10. A modular quick-release metal-based removable and washable filter element structure for mine hydraulic support according to claim 9, characterized in that: It also includes an integrated valve block and an interface valve block disposed on the top of the integrated valve block. The outer shell, filter element module, quick-release cover, active sealing sleeve and auxiliary sealing sleeve together constitute the filter element assembly. The integrated valve block is provided with a filter element mounting cavity adapted to the filter element assembly. The threaded mounting head is threadedly connected to the filter element mounting cavity. The perforated outer cylinder and the tail end connecting cylinder are located in the filter element mounting cavity. The liquid flow channel in the interface valve block is connected to the liquid inlet pipe and the filtered liquid flow area outside the perforated outer cylinder.

Images