Locking-direction-adjustable hydraulic air filter with lock

Abstract

The utility model relates to the technical field of hydraulic accessories, and discloses a locking-direction-adjustable hydraulic air filter with a lock, which comprises a mounting flange fixedly connected with a hydraulic oil tank interface through a plurality of connecting bolts arranged circumferentially, and the bottom end of the mounting flange is connected with an oiling filter cartridge; the lower spring bolt piece is connected between any connecting bolt and the flange face of the installation flange in a pressed mode. The air filter head is rotationally connected to the top of the mounting flange; the upper spring bolt piece is rotationally connected to the air filter head, and the upper spring bolt piece and the lower spring bolt piece are connected in a locked mode through a lock. The lower spring bolt piece can be fixed by selecting any one connecting bolt, and the upper spring bolt piece can be independently rotated and adjusted relative to the air filter head, so that the locking direction is not limited by the end position of thread screwing or the fixing direction of the mounting flange any more. A user can flexibly select the optimal locking angle according to the requirements of peripheral space layout, operation habits and the like of the oil tank, and the problems that an existing product is single in locking direction and limited in installation are solved.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic components technology, and more specifically, to a hydraulic air filter, particularly a lockable hydraulic air filter with adjustable locking direction. Background Technology

[0002] A hydraulic air filter is a hydraulic accessory consisting of an air filter and a fuel filter, used in the hydraulic systems of construction machinery vehicles. It prevents particulate contaminants from entering the system through the fuel tank's breather and prevents contaminants from being introduced during refueling. It also maintains pressure balance between the fuel tank and atmospheric pressure to prevent cavitation in the pump. When the hydraulic system is operating, the fuel level in the tank changes; the filter filters the intake air and simultaneously acts as a fuel filler to filter new fuel.

[0003] Existing hydraulic air filters are fixed to the oil tank's filler port via a mounting flange. An air filter head is screwed onto the flange, which can be unscrewed to refill the oil. To prevent oil theft, existing air filters typically have a lock; that is, the lock must be opened before refilling, as seen in publication number CN203648301U, named "Locked Hydraulic Air Filter." This type of filter usually uses a fixed locking tongue structure. Once the mounting flange is secured with screws, the position of the locking tongue is fixed, making it impossible to adjust the locking direction according to the site layout. Furthermore, traditional air filter heads are easily left lying around after refilling, leading to oil contamination or accidental loss of the air filter head.

[0004] To solve the above problems, a lockable hydraulic air filter with adjustable locking direction is needed. Utility Model Content

[0005] In order to overcome the shortcomings of existing hydraulic air filters, such as poor locking adaptability and easy loss of air filter heads, this utility model provides a lockable hydraulic air filter with adjustable locking direction.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A lockable hydraulic air filter with adjustable locking direction, comprising:

[0008] The mounting flange is fixedly connected to the hydraulic oil tank interface by a plurality of circumferentially arranged connecting bolts, and the bottom end of the mounting flange is connected to an oil filling filter cartridge.

[0009] A lower locking tongue is pressed between any of the connecting bolts and the flange face of the mounting flange;

[0010] An air filter head, which is screwed onto the top of the mounting flange;

[0011] The upper locking tongue is rotatably connected to the air filter head, and the upper locking tongue and the lower locking tongue are locked together by a lock.

[0012] Furthermore, the lower locking tongue has a first socket hole for engaging with any of the connecting bolts and a first locking hole; the upper locking tongue has a second socket hole for engaging with the air filter head and a second locking hole arranged opposite to the first locking hole, and the locking rod of the lock passes through the first locking hole and the second locking hole.

[0013] Furthermore, the lower locking tongue includes: a first horizontal section and a first inclined bent section integrally connected thereto, the first horizontal section having the first socket hole, the first inclined bent section extending out of the air filter head arrangement, and the first inclined bent section having the first locking hole; the upper locking tongue includes: a second horizontal section and a second inclined bent section integrally connected thereto, the second horizontal section having the second socket hole, the second inclined bent section extending out of the air filter head arrangement, and the second inclined bent section having the second locking hole.

[0014] Furthermore, a limiting component is fixedly provided on the air filter head, and the second horizontal segment is axially limited between the limiting component and the brim of the air filter head, with multiple connecting bolts located directly below the brim.

[0015] Furthermore, the limiting component is a retaining ring, and an annular groove is provided on the outer periphery of the air filter head, with the retaining ring embedded in the annular groove.

[0016] Furthermore, it also includes a flexible connector connecting the mounting flange and the air filter head, with one end of the flexible connector connected to the mounting flange and the other end connected to the air filter head.

[0017] Furthermore, the flexible connector is a chain built into the inner hole of the mounting flange. One end of the chain is connected to the hanging hole on the inner wall of the mounting flange through a hanging ring, and the other end of the chain is fixedly connected to a pressure plate. The pressure plate is pressed onto the air filter head by fixing screws.

[0018] Furthermore, a first sealing ring for sealing contact with the oil tank interface is fixed on the bottom end face of the mounting flange and on the outer periphery of the refueling filter cartridge.

[0019] Furthermore, a second sealing ring is press-fitted between the mounting flange and the air filter head.

[0020] Furthermore, the refueling filter cartridge includes a cylindrical frame, a filter screen, and a bottom cover. The upper end of the cylindrical frame is fixedly connected to the bottom end face of the mounting flange, and the lower end of the cylindrical frame is fixedly connected to the bottom cover. The filter screen is provided on the side wall of the cylindrical frame.

[0021] This utility model provides a lockable hydraulic air filter with adjustable locking direction. Through improvements and optimizations to its locking structure and anti-loss structure, the following comprehensive technical effects are achieved:

[0022] 1. The locking direction is adjustable to adapt to diverse installation scenarios:

[0023] The design, featuring a lower locking tongue that allows for easy fixing with any connecting bolt and an upper locking tongue that can rotate independently relative to the air filter head, eliminates the restriction of locking direction to the thread engagement termination position or the mounting flange's fixed orientation. Users can flexibly select the optimal locking angle based on the surrounding space of the fuel tank, their operating habits, and anti-theft requirements. This solves the problems of limited locking direction and installation constraints inherent in existing products, significantly improving the product's versatility and installation adaptability.

[0024] II. Reliable anti-theft and anti-tampering functions ensure equipment safety:

[0025] After the upper and lower locking tongues are locked together by the locking mechanism, the rotational freedom of the air filter head relative to the mounting flange is completely restricted. The air filter head cannot be unscrewed without unlocking the mechanism, effectively preventing unauthorized disassembly, refueling, or theft of oil. The locking structure is independent of the normal threaded connection of the air filter head, and the locked state does not affect the air filter's ventilation and filtration function, achieving a balance between safety protection and normal operation.

[0026] III. Anti-loss design prevents parts from being lost, improving ease of use:

[0027] The air filter head is connected to the mounting flange via a flexible connector (preferably a chain). After refueling or maintenance, the air filter head remains suspended on the mounting flange, preventing it from falling, being lost, or being damaged due to forgetfulness, collision, or operational errors. This design avoids the safety hazard of the fuel tank being directly exposed to the external environment due to a lost air filter head, while also reducing user costs and inconvenience, reflecting a human-centered design philosophy.

[0028] IV. Dual sealing structure ensures reliable system sealing:

[0029] The first sealing ring is placed between the mounting flange and the oil tank interface to ensure a reliable static seal at the mounting connection surface; the second sealing ring is placed between the mounting flange and the air filter head to ensure a reliable dynamic seal at the screw-in part in the unlocked state. This dual-sealing structure targets different sealing interfaces, effectively preventing oil leakage and the intrusion of external contaminants. Even under vibration conditions, it maintains good sealing performance, ensuring the cleanliness and operational stability of the hydraulic system.

[0030] V. High-efficiency filtration structure ensures oil cleanliness:

[0031] The oil filling filter cartridge adopts a cylindrical skeleton structure with filter screens arranged on the side walls. Compared with end-face filtration, the filtration area is significantly increased, the flow capacity is enhanced, the filling resistance is low, and the filling efficiency is high. The bottom cover design forces all oil to pass through the side wall filter screen, preventing unfiltered oil from short-circuiting into the oil tank, ensuring the filtration effect, and thus extending the service life of hydraulic system components.

[0032] VI. Compact structure, easy assembly and maintenance:

[0033] All functional components (locking tongue, retaining ring, chain, sealing ring, etc.) adopt a modular design and standard connection method, requiring no complex tools or special processes for assembly. The axial limiting of the upper locking tongue is achieved through the cooperation of the retaining ring and the slot, while the lower locking tongue is directly fixed using existing connecting bolts, without adding any additional fasteners. This results in a simple structure and controllable costs. At the same time, the layout of each component is reasonable, achieving multifunctional integration within a limited space, and resulting in a compact and aesthetically pleasing appearance. Attached Figure Description

[0034] 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 embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of a lockable hydraulic air filter with adjustable locking direction provided by this utility model.

[0036] Figure 2 for Figure 1 A schematic diagram of the assembly of the mounting flange and the air filter head.

[0037] Figure 3 This is a schematic diagram of the lower locking tongue.

[0038] Figure 4 This is a schematic diagram of the locking tongue. Detailed Implementation

[0039] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0040] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0042] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0043] See Figures 1-4 As shown in the figure, this utility model discloses a lockable hydraulic air filter with adjustable locking direction, comprising:

[0044] Mounting flange 1 is fixedly connected to the hydraulic oil tank interface by multiple connecting bolts 2 arranged around the circumference. The bottom end of mounting flange 1 is connected to oil filling filter cartridge 3.

[0045] The lower locking tongue 4 is pressed between any one of the connecting bolts 2 and the flange face of the mounting flange 1;

[0046] Air filter head 5 is screwed onto the top of mounting flange 1;

[0047] The upper locking tongue 6 is rotatably connected to the air filter head 5, and the upper locking tongue 6 and the lower locking tongue 4 are locked together by the lock 7.

[0048] How this example works:

[0049] During installation, first, fix the mounting flange 1 to the hydraulic oil tank interface using multiple circumferentially distributed connecting bolts 2. Based on site space, operating habits, or anti-pry requirements, the user selects one of the connecting bolts 2, places the lower locking tongue 4 onto the bolt, and presses it between the flange face and the bolt head to fix the position of the lower locking tongue 4. The air filter head 5 is then tightened onto the top of the mounting flange 1, and the upper locking tongue 6 can be rotated to adjust its angle. The user rotates the upper locking tongue 6 to align it circumferentially with the fixed lower locking tongue 4, and then locks them together using the locking device 7. After locking, the air filter head 5 cannot be rotated or disassembled relative to the mounting flange 1, achieving anti-theft functions for both the air filter head and the oil in the tank.

[0050] The technical effects of this example:

[0051] The lower locking tongue 4 can be used to select any connecting bolt 2 for fixing, so that the locking direction can be flexibly adjusted according to the installation environment to adapt to different oil tank layouts and operating spaces.

[0052] The upper locking tongue 6 is rotatably connected to the air filter head 5, and its alignment position can be independently adjusted after the air filter head 5 is tightened, avoiding the problem of not being able to align the lock hole due to the fixed end position of the thread engagement.

[0053] When the lock 7 is engaged, it simultaneously restricts the rotational freedom of the air filter head 5, achieving anti-theft and anti-tampering functions without affecting the normal ventilation and filtration functions.

[0054] In some specific embodiments, the lower locking tongue 4 has a first socket hole 411 for engaging with any connecting bolt 2 and a first locking hole 421; the upper locking tongue 6 has a second socket hole 611 for engaging with the air filter head 5 and a second locking hole 621 arranged opposite to the first locking hole 421, and the locking rod 71 of the lock 7 passes through the first locking hole 421 and the second locking hole 621.

[0055] The lower locking tongue 4 is fitted onto the selected connecting bolt 2 through the first socket 411. After the bolt is tightened, the lower locking tongue 4 is clamped and fixed. The upper locking tongue 6 is fitted onto the outside of the air filter head 5 through the second socket 611 and can rotate around the axis of the air filter head 5. When locking, the locking rod 71 of the lock 7 is passed through the first locking hole 421 and the second locking hole 621 simultaneously, so that the upper and lower locking tongues are locked in the circumferential direction.

[0056] The technical effects of this example:

[0057] The first socket 411 mates with the connecting bolt 2 to achieve quick positioning and reliable fixation of the lower locking tongue 4 without the need for additional fasteners.

[0058] The second socket 611 allows the upper locking tongue 6 to rotate with the air filter head 5, resulting in a simple structure and easy assembly.

[0059] The locking rod 71 passes through the double locking hole structure, ensuring reliable locking. After unlocking, the upper locking tongue 6 can rotate freely, facilitating the adjustment of the locking direction next time.

[0060] In a further embodiment, the lower locking tongue 4 includes: a first horizontal section 41 and a first inclined bending section 42 integrally connected thereto. The first horizontal section 41 has a first socket hole 411, the first inclined bending section 42 extends out to arrange an air filter head 5, and the first inclined bending section 42 has a first locking hole 421. The upper locking tongue 6 includes: a second horizontal section 61 and a second inclined bending section 62 integrally connected thereto. The second horizontal section 61 has a second socket hole 611, the second inclined bending section 62 extends out to arrange an air filter head 5, and the second inclined bending section 62 has a second locking hole 621.

[0061] In this embodiment, the first horizontal section 41 of the lower locking tongue 4 is pressed under the connecting bolt 2, and the first inclined bending section 42 extends obliquely upward or outward, so that the first locking hole 421 is located outside the side of the air filter head 5. The second horizontal section 61 of the upper locking tongue 6 is fitted onto the air filter head 5 and is axially limited, and the second inclined bending section 62 also extends outward, so that the second locking hole 621 is spatially close to and aligned with the first locking hole 421. When locked, the locking rod 71 passes through the locking holes on the two inclined bending sections.

[0062] The technical effects of this example:

[0063] The inclined bending section leads the locking position to the outside of the air filter head 5, making it easier for operators to observe and lock, and avoiding interference between the lock 7 and the air filter head 5 body.

[0064] The horizontal and inclined sections are integrally molded, resulting in high structural strength, simple processing, and resistance to deformation during assembly.

[0065] Both the upper and lower locking tongues extend outwards, making the locking point farther away from the center of the air filter head, providing more operating space and adapting to locks of different sizes.

[0066] This utility model also provides an embodiment in which a limiting member 8 is fixedly provided on the air filter head 5, the second horizontal segment 61 is axially limited between the limiting member 8 and the brim 51 of the air filter head 5, and multiple connecting bolts 2 are all located directly below the brim 51.

[0067] The second horizontal section 61 of the locking tongue 6 is fitted onto the outer circumference of the air filter head 5. Its upper part is blocked by the brim 51 of the air filter head 5, and its lower part is blocked by the limiting piece 8 fixedly set on the air filter head 5, thus being clamped in the axial direction, but able to rotate freely in the circumferential direction. All connecting bolts 2 are located within the horizontal projection range of the brim 51.

[0068] The technical effects of this example:

[0069] The axial limiting structure prevents the upper locking tongue 6 from moving up and down on the air filter head 5, ensuring the stability of the locking hole in the height direction and facilitating alignment with the lower locking tongue 4.

[0070] No need to machine threads or add complex fasteners on the air filter head 5, resulting in high assembly efficiency.

[0071] The connecting bolt 2 is located below the brim 51, which shields the air filter head 5 from external debris and rainwater, reducing the risk of bolt corrosion. Furthermore, the brim 51's shielding effect prevents unauthorized personnel from easily removing the connecting bolt after the air filter head 5 is installed, thus preventing theft.

[0072] The limiting component 8 is a retaining ring, and the outer periphery of the air filter head 5 is provided with an annular groove 501, in which the retaining ring is embedded.

[0073] A ring groove is machined on the outer circle of the air filter head 5. After the second horizontal section 61 of the upper locking tongue 6 is fitted into the groove, the retaining ring is then embedded in the groove. The outer diameter of the retaining ring is larger than the inner hole of the second horizontal section 61, thereby limiting its axial movement.

[0074] Technical effects:

[0075] The retaining ring and the slot are a standard mechanical limiting structure, which is easy to install and requires no special tools.

[0076] The limit is reliable, the retaining ring has a strong ability to withstand axial force, and it is not easy to loosen after long-term use.

[0077] The slot is easy to process and has little impact on the structural strength of the air filter head.

[0078] In other embodiments, the lockable hydraulic air filter with adjustable locking direction also includes a flexible connector 9 connected between the mounting flange 1 and the air filter head 5, with one end of the flexible connector 9 connected to the mounting flange 1 and the other end connected to the air filter head 5.

[0079] When the user unlocks and unscrews the air filter head 5 for refueling or maintenance, the air filter head 5 separates from the mounting flange 1, but the flexible connector 9 keeps the two connected. The air filter head 5 hangs on one side of the mounting flange 1 and will not fall or be lost.

[0080] Technical effects:

[0081] Effectively prevents the air filter head 5 from accidentally falling off, being lost, or being damaged during refueling or maintenance.

[0082] The flexible connector 9 does not interfere with the normal screwing and unscrewing operation of the air filter head 5, and does not affect the appearance when retracted.

[0083] To prevent the fuel tank from being directly exposed to the external environment due to the loss of air filter head 5, thus improving safety during use.

[0084] The flexible connector 9 is a chain built into the inner hole of the mounting flange 1. One end of the chain is connected to the hanging hole 101 on the inner wall of the mounting flange 1 through the hanging ring 10. The other end of the chain is fixedly connected to the pressure plate 11, which is pressed onto the air filter head 5 by the fixing screw 12.

[0085] One end of the chain is hooked onto the mounting hole 101 on the inner wall of the mounting flange 1 via a hook 10, and the other end is fixed to the inside of the air filter head 5 via a pressure plate 11 and a fixing screw 12. When the air filter head 5 is unscrewed, the chain is straightened and the air filter head 5 is suspended next to the mounting flange 1; when it is screwed back, the chain automatically folds and is stored in the cavity between the air filter head 5 and the mounting flange 1.

[0086] Technical effects:

[0087] The chain has sufficient tensile strength, good durability, and is flexible and foldable, without taking up extra space.

[0088] The hanging ring and the hanging hole are easy to connect and can be installed and removed without any additional tools.

[0089] The pressure plate fixing method ensures a firm connection between the chain and the air filter head, and the structure is compact.

[0090] A first sealing ring 13 is fixed on the bottom end face of the mounting flange 1 and on the outer periphery of the oil filler filter cartridge 3 for sealing contact with the oil tank interface. When the mounting flange 1 is fixed to the oil tank interface by the connecting bolts 2, the first sealing ring 13 is pressed between the bottom end face of the mounting flange 1 and the end face of the oil tank interface, forming a circumferentially continuous sealing band. This prevents oil in the oil tank from leaking from the flange connection surface, ensuring the system's sealing performance, and also improves the product's leak-proof reliability under vibration conditions.

[0091] A second sealing ring 14 is press-fitted between the mounting flange 1 and the air filter head 5. When the air filter head 5 is tightened onto the mounting flange 1, the second sealing ring 14 is pressed between the mating surfaces of the two, forming a seal. This prevents external dust and moisture from entering the oil tank through the joint gap between the air filter head 5 and the mounting flange 1, and also prevents internal oil from evaporating or splashing out. Moreover, the second sealing ring and the first sealing ring form a double sealing barrier, targeting the dynamic mating surface and the static sealing surface respectively, improving the overall sealing reliability.

[0092] The oil filling filter cartridge 3 includes a cylindrical frame 31, a filter screen 32, and a bottom cover 33. The upper end of the cylindrical frame 31 is fixedly connected to the bottom end face of the mounting flange 1, and the lower end of the cylindrical frame 31 is fixedly connected to the bottom cover 33. The side wall of the cylindrical frame 31 is provided with a filter screen 32.

[0093] During refueling, the oil enters through the center hole of the mounting flange 1 and flows through the filter screen 32 on the side wall of the cylindrical frame. Impurities are intercepted by the filter screen, and the clean oil enters the oil tank. The bottom cover 33 seals the lower end of the filter cartridge, guiding all the oil through the side wall filter screen and increasing the filtration area.

[0094] Technical effects:

[0095] The cylindrical frame provides structural support, ensuring that the filter screen does not deform under the impact of oil.

[0096] Compared to end-face filtration, side-wall filter screens have a larger filtration area, stronger flow capacity, and lower lubrication resistance.

[0097] The sealed bottom cover prevents unfiltered oil from directly short-circuiting into the oil tank from the bottom, ensuring filtration effectiveness.

[0098] The combined structure of the frame, filter screen, and bottom cover facilitates modular production and filter screen replacement.

[0099] This utility model, while retaining the basic filtration function of a hydraulic air filter, integrates multiple functions such as adjustable directional locking, anti-theft and anti-disassembly, anti-loss, double sealing, and high-efficiency filtration. It effectively solves the practical pain points of existing products, such as limited locking direction, easy loss of air filter head, and insufficient sealing reliability. It significantly improves the product's safety, reliability, ease of operation, and environmental adaptability, and has good practical value and market promotion prospects.

[0100] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0101] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A lockable, direction-adjustable hydraulic air filter comprising, include: Mounting flange (1), the mounting flange (1) is fixedly connected to the hydraulic oil tank interface by a plurality of connecting bolts (2) arranged around the circumference, and the bottom end of the mounting flange (1) is connected to an oil filling filter cartridge (3). The lower locking tongue (4) is pressed between any of the connecting bolts (2) and the flange face of the mounting flange (1); Air filter head (5), which is screwed onto the top of the mounting flange (1); The upper locking tongue (6) is rotatably connected to the air filter head (5), and the upper locking tongue (6) and the lower locking tongue (4) are locked together by a lock (7).

2. The adjustable lock directional belt hydraulic air filter of claim 1, wherein, The lower locking tongue (4) has a first socket hole (411) for engaging with any of the connecting bolts (2) and a first locking hole (421); the upper locking tongue (6) has a second socket hole (611) for engaging with the air filter head (5) and a second locking hole (621) arranged opposite to the first locking hole (421); the locking rod (71) of the lock (7) passes through the first locking hole (421) and the second locking hole (621).

3. A lockable hydraulic air filter with adjustable locking direction according to claim 2, characterized in that, The lower locking tongue (4) includes: a first horizontal section (41) and a first inclined bending section (42) integrally connected thereto. The first horizontal section (41) is provided with the first sleeve hole (411). The first inclined bending section (42) extends out of the air filter head (5) and is provided with the first locking hole (421). The upper locking tongue (6) includes: a second horizontal section (61) and a second inclined bending section (62) integrally connected thereto. The second horizontal section (61) is provided with the second sleeve hole (611). The second inclined bending section (62) extends out of the air filter head (5) and is provided with the second locking hole (621).

4. A lockable hydraulic air filter with adjustable locking direction according to claim 3, characterized in that, A limiting member (8) is fixedly provided on the air filter head (5). The second horizontal segment (61) is axially limited between the limiting member (8) and the brim (51) of the air filter head (5). The multiple connecting bolts (2) are all located directly below the brim (51).

5. A lockable hydraulic air filter with adjustable locking direction according to claim 4, characterized in that, The limiting member (8) is a retaining ring, and the outer periphery of the air filter head (5) is provided with an annular groove (501), and the retaining ring is embedded in the annular groove (501).

6. A lockable hydraulic air filter with adjustable locking direction according to any one of claims 1-5, characterized in that, It also includes a flexible connector (9) connecting the mounting flange (1) and the air filter head (5), one end of the flexible connector (9) being connected to the mounting flange (1) and the other end being connected to the air filter head (5).

7. A lockable hydraulic air filter with adjustable locking direction according to claim 6, characterized in that, The flexible connector (9) is a chain built into the inner hole of the mounting flange (1). One end of the chain is connected to the hanging hole (101) on the inner wall of the mounting flange (1) through a hanging ring (10). The other end of the chain is fixedly connected to a pressure plate (11). The pressure plate (11) is pressed onto the air filter head (5) by a fixing screw (12).

8. A lockable hydraulic air filter with adjustable locking direction according to any one of claims 1-5 and 7, characterized in that, A first sealing ring (13) for sealing contact with the oil tank interface is fixed on the bottom end face of the mounting flange (1) and on the outer periphery of the oil filling filter (3).

9. A lockable hydraulic air filter with adjustable locking direction according to any one of claims 1-5 and 7, characterized in that, A second sealing ring (14) is pressed between the mounting flange (1) and the air filter head (5).

10. A lockable hydraulic air filter with adjustable locking direction according to any one of claims 1-5 and 7, characterized in that, The refueling filter cartridge (3) includes a cylindrical frame (31), a filter screen (32), and a bottom cover (33). The upper end of the cylindrical frame (31) is fixedly connected to the bottom end face of the mounting flange (1), and the lower end of the cylindrical frame (31) is fixedly connected to the bottom cover (33). The filter screen (32) is provided on the side wall of the cylindrical frame (31).

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