Impurity removal device for hydraulic oil tank, hydraulic oil tank and operation machine

Abstract

The utility model relates to an impurity removal device for a hydraulic oil tank, the hydraulic oil tank and an operation machine. The impurity removing device comprises an inner side plugging piece arranged on the inner side of a bottom plate of the oil tank, and the inner side plugging piece is configured to be capable of moving between a plugging position for plugging a through hole in the bottom plate and an opening position for leaving the through hole; the adsorption assembly comprises an outer side plugging piece detachably installed on the outer side of the bottom plate and an adsorption piece arranged on the outer side plugging piece. The outer side plugging piece is jointed with the inner side plugging piece in a mounting state so as to enable the inner side plugging piece to overcome deflection force borne by the inner side plugging piece to be in an open position, a liquid-tight space communicated with the interior of the oil tank through the through hole is limited relative to the bottom plate in the mounting state, and the adsorption piece is located in the liquid-tight space; the inner side plugging piece moves to the plugging position under the action of deflection force when the outer side plugging piece is detached. The impurity removing device is simple in structure, convenient to operate and capable of reliably and continuously removing a large number of impurities from the bottom of the oil tank.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic oil tanks, and in particular to an impurity removal device for removing impurities contained in hydraulic oil from the bottom of a hydraulic oil tank. Background Technology

[0002] Hydraulic system is an important part of many working machines (such as loaders, excavators, etc.). In the hydraulic system, the hydraulic oil tank is a basic auxiliary component, mainly used to store hydraulic oil (in this application, "hydraulic oil" refers to various possible working media of the hydraulic system), dissipate oil heat, separate air and moisture, etc.

[0003] After the operating machine has been working for a period of time, the hydraulic components in the hydraulic system will wear out, resulting in a lot of fine particle impurities, most of which are "iron filings". These impurities will mix into the hydraulic oil, causing the oil to become "dirty". Dirty oil will carry impurities to various parts of the system when circulating, which will aggravate the damage to various components. Therefore, the removal of impurities in the hydraulic oil tank is crucial to ensure the normal operation of the hydraulic system.

[0004] An existing method for removing impurities from hydraulic oil tanks is a physical filtration method that uses filters or screens to intercept impurities such as solid particles and suspended matter in the hydraulic oil. This physical filtration method generally only sets a filter at the oil return port of the hydraulic oil tank, while the largest oil outlet does not have a filter. Although this can remove larger particle impurities in the hydraulic oil entering the hydraulic oil tank, there will still be a lot of tiny particle impurities at the bottom of the hydraulic oil tank. Moreover, the filter element at the oil return port needs to be replaced regularly, but the number of filter elements in the vehicle system of the operating machinery is large and expensive, resulting in increased vehicle use costs for operating machinery users. In order to remove impurities deposited at the bottom of the hydraulic oil tank, one solution is to put a strong magnet into the bottom of the tank. Although this can absorb impurities, it is difficult to remove the strong magnet, and the absorbed impurities cannot be removed from the tank, resulting in the inability to continuously remove impurities. Contents of utility model

[0005] The purpose of the utility model is to solve at least one of the above problems and / or other defects existing in the prior art.

[0006] To achieve the above object, one aspect of the present utility model provides an impurity removing device for a hydraulic oil tank, and the hydraulic oil tank includes a bottom plate with a through hole. The impurity removing device includes: an inner plugging member disposed inside the bottom plate, the inner plugging member being configured to be movable between a plugging position for plugging the through hole and an opening position away from the through hole and to withstand a biasing force tending to move it to the plugging position; and an adsorption assembly, the adsorption assembly including an outer plugging member detachably mounted on the outer side of the bottom plate and an adsorbent disposed on the outer plugging member. The outer plugging member engages with the inner plugging member in the installed state to keep the inner plugging member in the opening position against the biasing force, and defines a liquid-tight space communicating with the interior of the hydraulic oil tank through the through hole relative to the bottom plate in the installed state, and the adsorbent is located in the liquid-tight space; the inner plugging member moves to the plugging position under the action of the biasing force when the outer plugging member is removed.

[0007] According to an embodiment of the present utility model, the impurity removing device further includes a cylindrical outer support member disposed outside the bottom plate and open at both upper and lower ends, an upper opening end of the outer support member being fixed to the bottom plate along the circumference of the through hole, and the outer plugging member being detachably and liquid-tightly mounted to a lower opening end of the outer support member via a first sealing ring to define the liquid-tight space relative to the bottom plate via the outer support member.

[0008] According to an embodiment of the present utility model, the impurity removing device further includes an inner support member disposed inside the bottom plate, the inner support member including a cylindrical support main body portion open at the lower end and closed at the upper end and a plurality of support columns extending from the support main body portion and spaced apart circumferentially therefrom, the plurality of support columns being fixed to the bottom plate to support the support main body portion such that an opening end of the support main body portion is spaced apart from the through hole facing each other, and the inner plugging member being slidably received axially along the support main body portion therein.

[0009] According to an embodiment of the present utility model, an elastic member for providing at least a part of the biasing force to the inner plugging member is disposed between a closed end of the support main body portion and the inner plugging member inside the support main body portion.

[0010] According to an embodiment of the present utility model, the outer support member has an enlarged inner diameter portion at its upper opening end, and the inner plugging member abuts against a step portion formed by a bottom wall of the enlarged inner diameter portion and is liquid-tightly engaged with the enlarged inner diameter portion via a second sealing ring when in its plugging position.

[0011] According to an embodiment of the present utility model, the outer plugging member includes a sleeve portion detachably connected to the lower opening end of the outer support member, having an upper opening and a closed lower end, and a protruding portion extending upward from the closed end of the sleeve portion. The protruding portion is configured to abut against the inner plugging member when the outer plugging member is installed, so that the inner plugging member overcomes the biasing force and moves from the plugging position to and remains in the opening position.

[0012] According to an embodiment of the present utility model, the adsorbing member includes a magnet sheet sleeved on the protruding portion and accommodated in the sleeve portion.

[0013] According to an embodiment of the present utility model, the sleeve portion is connected to the lower opening end of the outer support member by means of a threaded fit.

[0014] Another aspect of the present utility model provides a hydraulic oil tank, which includes the impurity removing device as described in any one of the above.

[0015] Yet another aspect of the present utility model provides a working machine, which includes the hydraulic oil tank as described above.

[0016] For the impurity removing device according to the present utility model, an outer plugging member and an inner plugging member are respectively provided on the inner and outer sides of the bottom plate of the hydraulic oil tank relative to the through hole opened on the tank bottom plate. The outer plugging member with the adsorbing member directly or indirectly defines a liquid-tight space communicating with the inside of the tank through the bottom plate through hole and accommodating the adsorbing member in its installed state. Thus, a large amount of hydraulic oil impurities adsorbed by the adsorbing member can be continuously received in this liquid-tight space. When the outer plugging member is removed, it can take away the adsorbing member and the impurities adsorbed by it, and can be reinstalled after removing these impurities for repeated use, so as to continuously remove the impurities at the bottom of the hydraulic oil tank. When the outer plugging member is removed, the inner plugging member can automatically move to its plugging position under the action of the biasing force borne by it, thereby preventing the hydraulic oil in the tank from leaking out through the bottom plate through hole when the outer plugging member is removed. The impurity removing device according to the present utility model has a simple structure and convenient operation, and can reliably and continuously remove a large amount of impurities from the bottom of the hydraulic oil tank, thereby indirectly extending the service life of the filter provided at the oil return port of the hydraulic oil tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The features and advantages of the present utility model will be clearly understood from the following detailed description provided with reference to the accompanying drawings. It should be understood that the following drawings are merely schematic and not necessarily drawn to scale, and thus should not be considered as limiting the present utility model, wherein:

[0018] Figure 1It is a perspective view of an exemplary work machine to which the hydraulic oil tank and the impurity removal device according to the present utility model can be applied.

[0019] Figure 2 It is a perspective view of the impurity removal device according to an embodiment of the present utility model installed on the bottom plate of the hydraulic oil tank;

[0020] Figure 3 It is Figure 2 an exploded view of the impurity removal device in

[0021] Figure 4 It is Figure 2 a schematic diagram of the outer sealing member of the impurity removal device in

[0022] Figure 5 It is Figure 2 a schematic diagram of the outer sealing member of the impurity removal device in

[0023] Figure 6 It is Figure 2 a sectional view of the inner support member of the impurity removal device in

[0024] Figure 7 It is Figure 2 a sectional view of the outer sealing member of the impurity removal device in

[0025] Description of reference numerals:

[0026] 1. Hydraulic oil tank; 11. Through hole; 12. Bottom plate; 2. Inner sealing member; 21. Second sealing groove; 3. Adsorption assembly; 31. Outer sealing member; 311. Sleeve part; 312. Closed end of the sleeve part; 313. First sealing groove; 314. Protruding part; 32. Adsorbent; 4. Inner support member; 41. Support main body part; 42. Closed end of the support main body part; 43. Support column; 5. Outer support member; 51. Step part; 6. Elastic member; 7. Second sealing ring; 8. First sealing ring. Detailed description of the embodiments

[0027] Embodiments of the present utility model will be described below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a more thorough understanding and implementation of the present utility model by those skilled in the art. However, it is obvious to those skilled in the art that some of these specific details may not be required for the implementation of the present utility model. In addition, it should be understood that the present utility model is not limited to the specific embodiments described. Instead, any combination of the features and elements described below can be considered for implementing the present utility model, regardless of whether they relate to different embodiments. Therefore, the aspects, features, embodiments, and advantages described below are for illustrative purposes only and should not be regarded as elements or limitations of the claims, unless expressly recited in the claims.

[0028] Figure 1 An exemplary work machine 100 is shown. The work machine 100 can be, for example, the illustrated wheel loader. The work machine 100 can also be any other type of work machine that performs operations related to a specific industry (such as mining, construction, agriculture, transportation, etc.) and works and travels in various work environments (such as mines, construction sites, farms, and roads, etc.), such as a crawler excavator, a wheel grader, etc.

[0029] The work machine 100 can include a main frame 90, an operator accommodation space (such as a cab 95), and a work implement 96. In one embodiment, the work implement 96 can be a bucket applied to a loader. The work machine 100 can also include a hydraulic system having various hydraulic components, such as at least one hydraulic cylinder 97 that is operatively connected to the work implement 96 and used to control the movement of the work implement 96. A traveling device 94 is arranged at the lower part of the work machine 100 for supporting and moving the work machine 100. In one embodiment, the traveling device 94 includes wheels 91.

[0030] The hydraulic system of the work machine 100 can employ a hydraulic oil tank (sometimes also simply referred to as "oil tank" in this article) equipped with an impurity removal device according to the present utility model. Figure 2 Such a hydraulic oil tank 1 according to one embodiment is shown. The hydraulic oil tank 1 can be formed, for example, by enclosing and connecting a plurality of plate members, and these plate members particularly include a bottom plate (sometimes also referred to as "oil tank bottom plate") 12 that is located at the bottom when the hydraulic oil tank 1 is in a normal working posture after being installed in place. The bottom plate 12 is provided with through holes 11 for installing the impurity removal device according to the present utility model. Whether the bottom plate 12 is flat or curved, or horizontally arranged or inclined, the through holes 11 can be provided at the lowest position of the bottom plate 12, so as to facilitate the movement of impurities under the action of gravity towards the position where the impurity removal device is located.

[0031] The following refers to Figures 3 to 7The specific structure of the impurity removal device according to one embodiment of the utility model is described. In this article, the side of the bottom plate 12 that points to or faces the inside of the hydraulic oil tank is called the "inner side" ( Figures 3 to 5 ), while the side pointing or facing the outside of the hydraulic oil tank is called the "outside" ( Figures 3 to 5 In addition, when describing directions in this article, the direction pointing to or relatively closer to the inner side is called "upper", and the direction pointing to or relatively closer to the outer side is called "lower".

[0032] Figure 3 shows an exploded schematic diagram of the impurity removal device and the bottom plate 12 according to this embodiment. Combined with Figure 2 and Figure 3 As shown in FIG. 1 , the impurity removal device may mainly include an inner sealing member 2, an adsorption assembly 3, an inner support member 4, an outer support member 5 and an elastic member 6. The inner sealing member 2, the inner support member 4 and the elastic member 6 are arranged on the inner side of the bottom plate 12, while the adsorption assembly 3 and the outer support member 5 are arranged on the outer side of the bottom plate 12.

[0033] The adsorption assembly 3 may include an outer sealing member 31 detachably mounted on the outer side of the bottom plate 12 and an adsorption member 32 disposed on the outer sealing member 31 for adsorbing impurities contained in the hydraulic oil. The outer sealing member 31 is in the Figure 4 In the installation state shown, a liquid-tight space can be defined indirectly or directly relative to the bottom plate 12, and the liquid-tight space is connected to the interior of the hydraulic oil tank 1 through the through hole 11 on the bottom plate 12, so that the hydraulic oil at the bottom of the hydraulic oil tank and the impurities contained therein can enter the liquid-tight space through the through hole 11. In this application, the so-called "liquid-tight" space refers to a space that can seal the hydraulic oil entering through the through hole 11 inside and prevent it from leaking out.

[0034] In Figure 4 and 5 In the embodiment shown in the figure, the outer blocking member 31 is detachably mounted on the outer side of the bottom plate 12 by being detachably mounted on the outer supporting member 5 fixed to the outer side of the bottom plate 12, and in the embodiment shown in the figure, the outer blocking member 31 is detachably mounted on the outer side of the bottom plate 12, and Figure 4 In the installation state shown in , the liquid-tight space is indirectly defined relative to the bottom plate 12 via the outer support member 5, that is, as Figure 4 The space enclosed by the outer blocking member 31 and the outer supporting member 5 is also basically located outside the bottom plate 12.

[0035] If Figure 4 and Figure 5 ​​​​As shown, the outer support member 5 according to this embodiment can be in a cylindrical structure with openings at both its upper and lower ends. The upper opening end of the outer support member 5 is fixed to the bottom plate 12 along the periphery of the through hole 11 (for example, fixed to the inner periphery of the through hole 11 by welding), and is flush with the inner surface of the bottom plate 12 to facilitate the smooth movement of all the hydraulic oil and impurities at the bottom of the fuel tank to the through hole 11. The lower opening end of the outer support member 5 extends below the outer surface of the bottom plate 12, and an internal thread can be provided, for example, on its inner peripheral surface, so that the outer plugging member 31 can be detachably installed thereon by threaded connection.

[0036] Figure 7 The outer plugging member 31 according to this embodiment is shown enlarged. The outer plugging member 31 can include a sleeve portion 311 and a protruding portion 314. The sleeve portion 311 can be a cylindrical structure with an open upper end and a closed lower end, and an external thread is provided on its outer peripheral surface that matches the internal thread formed on the inner peripheral surface of the lower opening end of the outer support member 5, so that the outer plugging member 31 can be detachably installed on the outer support member 5 by threaded connection. The closed end 312 of the sleeve portion 311 can be used as, for example, a gripping portion for manual operation, so as to facilitate the installation of the outer plugging member 31 on the outer support member 5 and the removal from the outer support member 5. To this end, the closed end 312 of the sleeve portion 311 can have a larger outer diameter relative to the main body of the sleeve portion 311 to facilitate the gripping operation. A first sealing groove 313 can be provided, for example, on the outer peripheral surface of the sleeve portion 311 at a position adjacent to its closed end 312 for receiving the first sealing ring 8 (see Figure 7 and Figure 3 and 5 ), whereby the outer plugging member 31 can be liquid-tightly installed at the lower opening end of the outer support member 5, that is, as Figure 4 shown, in the installed state of the outer plugging member 31, the seal between the outer plugging member 31 and the outer support member 5 is achieved through the first sealing ring 8 to prevent the leakage of hydraulic oil between the two, thereby forming the above-mentioned liquid-tight space. The protruding portion 314 extends upward from the closed end 312 of the sleeve portion 311 and is configured to be able to abut against the inner plugging member 2 when the outer plugging member 31 is installed (which will be described in more detail below).

[0037] As Figure 4 shown, when the outer plugging member 31 is installed in place, the adsorbent 32 provided thereon is located in the above-mentioned liquid-tight space. Thus, the impurities contained in the hydraulic oil at the bottom of the hydraulic fuel tank can enter the liquid-tight space through the through hole 11 in the fuel tank bottom plate 12, be adsorbed onto the adsorbent 32 and continuously accumulate in the liquid-tight space, so that a large amount of impurities can be continuously adsorbed and stored by the adsorbent 32 in the liquid-tight space for a long time. As Figure 5As shown, when the outer plugging member 31 is removed from the outer support member 5, since the adsorbing member 32 is provided on the outer plugging member 31, the adsorbing member 32 and the impurities adsorbed thereon can be easily taken out from the liquid-tight space outside the fuel tank bottom plate together with the outer plugging member 31, so as to remove the impurities and / or replace the adsorbing member 32.

[0038] In the illustrated embodiment, the adsorbing member 32 is in the form of a magnet sheet, which is, for example, sleeved on the protruding portion 314 and received in the sleeve portion 311. Of course, the adsorbing member 32 can also adopt other structural forms and installation methods, as long as it can adsorb impurities in the hydraulic oil and is arranged on the outer plugging member 31 so as to be removable together with the outer plugging member 31.

[0039] In the illustrated embodiment, the outer plugging member 31 indirectly defines the liquid-tight space relative to the fuel tank bottom plate 12 via the outer support member 5, but the present invention is not limited thereto. The outer plugging member 31 can also directly define the liquid-tight space relative to the bottom plate 12. In this case, for example, the sleeve portion 311 of the outer plugging member 31 can be lengthened compared with the illustrated embodiment and directly connected to the internal thread formed on the inner circumferential surface of the through hole 11 (when the bottom plate 12 has sufficient thickness) through its external thread.

[0040] In the illustrated embodiment, the outer plugging member 31 is detachably mounted on the outer support member 5 by means of screw fit, but the present invention is not limited thereto. The outer plugging member 31 can also be mounted on the outer support member 5 by other detachable connection means such as snap connection and fastener connection.

[0041] Those skilled in the art can easily understand that when the outer plugging member 31 is removed from the outer support member 5 for maintenance, the through hole 11 in the fuel tank bottom plate 12 needs to be plugged to prevent the hydraulic oil in the fuel tank from flowing out through the lower opening end of the outer support member 5 via the through hole 11. For this purpose, as Figures 3 to 5 shown, the impurity removing device according to an embodiment of the present invention further includes an inner plugging member 2 provided inside the fuel tank bottom plate 12, which can move between an open position away from the through hole 11 as shown in Figure 4 and a plugging position blocking the through hole 11 as shown in Figure 5 . A biasing force that always tends to move it to the plugging position can be borne on the inner plugging member 2, which is beneficial to reducing the risk of hydraulic oil leakage through the through hole 11. In the illustrated embodiment, an elastic member 6 (such as the illustrated spring) is provided above the inner plugging member 2, which can always apply a downward biasing force to the inner plugging member 2 to make the inner plugging member 2 tend to move to the plugging position. Those skilled in the art can understand that the self-gravity of the inner plugging member 2 can also be used as an additional or alternative means of the elastic member 6 to provide a biasing force for the inner plugging member.

[0042] As described above, when the outer sealing member 31 is installed, its protruding portion 314 will move upward, so that it can abut against the inner sealing member 2, and further push the inner sealing member upward against the biasing force borne by the inner sealing member. When the outer sealing member 31 is installed in place as shown in Figure 4 , it engages with the inner sealing member 2 and jacks up the inner sealing member 2, so that the inner sealing member 2 overcomes the biasing force on the inner sealing member and leaves the through hole 11 to be in the open position. At this time, the hydraulic oil at the bottom of the hydraulic oil tank and the impurities contained therein can enter the above-mentioned liquid-tight space through the through hole 11. When the outer sealing member 31 is removed as shown in Figure 5 , its protruding portion 314 will disengage from the inner sealing member 2, and then the inner sealing member 2 will automatically move downward under the action of the biasing force to the sealing position for sealing the through hole 11.

[0043] In order to define the sealing position of the inner sealing member 2 so that the inner sealing member 2 will not move downward unrestrictedly under the action of the biasing force, as shown in Figure 4 and 5 , the outer support member 5 may have an enlarged inner diameter portion at its upper open end, and the bottom wall of the enlarged inner diameter portion forms a stepped portion 51. When the inner sealing member 2 moves downward toward its sealing position, it can partially extend into the enlarged inner diameter portion until its lower end abuts against the stepped portion 51, and at this time it reaches its sealing position. The inner sealing member 2 may be provided with a second sealing groove 21 extending circumferentially on its outer peripheral wall (see Figure 3 ), and a second sealing ring 7 can be received in the second sealing groove. The inner sealing member 2 can be liquid-tightly engaged with the enlarged inner diameter portion of the outer support member 5 via the second sealing ring 7 at its sealing position to achieve reliable sealing of the through hole 11. In other embodiments, the second sealing ring 7 can also be provided between the lower end of the inner sealing member 2 and the stepped portion 51.

[0044] In order to facilitate the movement of the inner sealing member 2 between the sealing position and the open position, an inner support member 4 can also be provided on the inner side of the fuel tank bottom plate 12 as shown in Figures 4 to 6 . As shown in Figure 6 , the inner support member 4 can include a support main body portion 41 and a plurality of support columns 43. The support main body portion 41 is cylindrical and has an opening at its lower end. The inner sealing member 2 can pass through the opening end of the support main body portion 41 and be slidably received therein along its axis, so that the support main body portion 41 can provide a guiding function for the movement of the inner sealing member 2 between the sealing position and the open position. In addition, the support main body portion 41 is closed at its upper end, and the elastic member 6 is received in the support main body portion 41 between the closed end 42 of the support main body portion 41 and the inner sealing member 2. The upper end of the elastic member 6 abuts against the closed end 42 of the support main body portion 41, and the lower end of the elastic member 6 abuts against the upper end of the inner sealing member 2 (for example, as shown in Figure 4is snap-fitted into the card slot formed at the upper end of the inner plugging member 2).

[0045] A plurality of support columns 43 arranged at intervals in the circumferential direction of the support main body 41 extend from the support main body 41 and are fixed on the fuel tank bottom plate 12. In the illustrated embodiment, four support columns 43 are provided, and they extend downward from the radially extending portion of the closed end 42 of the support main body 41. The plurality of support columns 43 support the support main body 41, so that the open end of the support main body 41 faces the through hole 11 in the bottom plate 12 and is spaced apart from each other by a gap. Thus, when the inner plugging member 2 is in the open position, the hydraulic oil at the bottom of the hydraulic fuel tank and the impurities contained therein can reach the through hole 11 via the intervals between the respective support columns 43 and the above-mentioned gap, and further enter the above-mentioned liquid-tight space defined by the outer plugging member 31 relative to the bottom plate 12 through the through hole 11, so that the impurities can be adsorbed by the adsorbent 2 in the liquid-tight space.

[0046] The present utility model also provides a hydraulic fuel tank 1 including the impurity removing device as described above and a working machine including the hydraulic fuel tank 1.

[0047] Industrial applicability

[0048] The impurity removing device according to the present utility model can be applied to the hydraulic fuel tank of the hydraulic system of various working machines (such as loaders, excavators, etc.), but is not limited thereto. Obviously, it can be used in any hydraulic system having a hydraulic fuel tank that needs to remove impurities to ensure that the components in the hydraulic system are not damaged by impurities.

[0049] Next, with reference to Figure 4 and 5 the illustrated embodiment describes the working process of the impurity removing device according to the present utility model.

[0050] First, the outer plugging member 31 is installed on the outer support member 5 fixed to the fuel tank bottom plate 12 by screwing, and during this process, the extending portion 314 of the outer plugging member 31 can engage with the inner plugging member 2 and push up the inner plugging member 2, so that the inner plugging member 2 moves upward from the plugging position against the biasing force thereon to leave the through hole 11 in the fuel tank bottom plate 12 and retract to the open position inside the inner support member 4. Thus, the hydraulic oil at the bottom of the hydraulic fuel tank and the impurities contained therein can enter the liquid-tight space defined by the outer plugging member 31 relative to the bottom plate 12 through the through hole 11, so that a large amount of impurities can be continuously adsorbed by the adsorbent 32 located in the liquid-tight space and accumulate in the liquid-tight space, playing a role in purifying the hydraulic oil at the bottom of the fuel tank.

[0051] When it is necessary to clean the impurities adsorbed by the adsorbing member 32, the outer plugging member 31 is loosened and moved downward to be removed from the outer supporting member 5. Correspondingly, the protruding portion 314 of the outer plugging member 31 is disengaged from the inner plugging member 2. Then, the inner plugging member 2 automatically moves downward from the open position under the action of the biasing force and partially enters the enlarged inner diameter portion of the outer supporting member 5 until it reaches its plugging position. At the plugging position, the inner plugging member 2 is liquid-tightly engaged with the outer supporting member 5 via the second sealing ring 7, so as to reliably prevent the hydraulic oil from flowing out through the through hole 11. The adsorbing member 32 provided on the outer plugging member 31 is also removed from the hydraulic oil tank as the outer plugging member 31 is removed, and after the adsorbed impurities are removed therefrom, it can be reinstalled on the outer supporting member 5 together with the outer plugging member 31 to adsorb impurities in the next working cycle.

[0052] According to the impurity removing device of the present utility model, an outer plugging member and an inner plugging member are respectively arranged on the inner side and the outer side of the bottom plate of the hydraulic oil tank relative to the through hole formed in the bottom plate of the tank. The outer plugging member with the adsorbing member directly or indirectly defines a liquid-tight space communicating with the inside of the tank through the bottom plate through hole and accommodating the adsorbing member in its installed state, so that a large amount of hydraulic oil impurities adsorbed by the adsorbing member can be continuously received in the liquid-tight space. When the outer plugging member is removed, it can take away the adsorbing member and the impurities adsorbed thereon, and can be reinstalled after removing these impurities for reuse, so as to continuously remove the impurities at the bottom of the hydraulic oil tank. When the outer plugging member is removed, the inner plugging member can automatically move to its plugging position under the action of the biasing force borne by it, thereby preventing the hydraulic oil in the tank from leaking out through the bottom plate through hole when the outer plugging member is removed. The impurity removing device according to the present utility model has a simple structure and is convenient to operate, and can reliably and continuously remove a large amount of impurities from the bottom of the hydraulic oil tank, thereby indirectly prolonging the service life of the filter provided at the oil return port of the hydraulic oil tank.

[0053] This specification is for illustrative purposes only and should not be expected to limit the scope of the present utility model in any way. Therefore, those skilled in the art of this technology should understand that various modifications can be made to the specific embodiments disclosed without departing from the whole and reasonable scope and spirit of the present utility model. Other aspects, features and advantages will become apparent from the drawings and the appended claims.

Claims

1. A device for removing impurities from a hydraulic oil tank (1), the hydraulic oil tank comprising a bottom plate (12) with a through hole (11), characterized in that: The impurity removal device comprises: an inner blocking member (2) disposed on the inner side of the bottom plate, the inner blocking member being configured to be movable between a blocking position for blocking the through hole (11) and an open position away from the through hole and to be subjected to a biasing force tending to move it to the blocking position; and An adsorption component (3), comprising an outer sealing member (31) detachably mounted on the outer side of the bottom plate (12) and an adsorption member (32) arranged on the outer sealing member, The outer sealing member (31) is engaged with the inner sealing member (2) in the installed state so that the inner sealing member overcomes the biasing force and is in the open position, and in the installed state, relative to the bottom plate (12), defines a liquid-tight space that is connected to the interior of the hydraulic oil tank (1) through the through hole (11), and the adsorption member (32) is located in the liquid-tight space; when the outer sealing member (31) is removed, the inner sealing member (2) moves to the blocking position under the action of the biasing force.

2. The impurity removal device according to claim 1, characterized in that: It also includes a cylindrical outer support member (5) arranged on the outer side of the base plate and open at both upper and lower ends, the upper open end of the outer support member being fixed to the base plate (12) along the periphery of the through hole (11), and the outer sealing member (31) being detachably and liquid-tightly mounted on the lower open end of the outer support member via a first sealing ring (8) to define the liquid-tight space relative to the base plate (12) via the outer support member.

3. The impurity removal device according to claim 2, characterized in that: It also includes an inner support member (4) arranged on the inner side of the base plate, the inner support member includes a cylindrical support body portion (41) which is open at the lower end and closed at the upper end, and a plurality of support columns (43) extending from the support body portion and arranged at intervals in the circumferential direction thereof, the plurality of support columns are fixed on the base plate (12) to support the support body portion (41) so that the open end of the support body portion and the through hole (11) are facing each other and spaced apart from each other, and the inner sealing member (2) can be slidably received inside the support body portion (41) along the axial direction.

4. The impurity removal device according to claim 3, characterized in that: An elastic member (6) is provided in the supporting body portion (41) between its closed end and the inner sealing member (2) for providing at least a portion of the biasing force to the inner sealing member.

5. The impurity removal device according to claim 4, characterized in that: The outer support member (5) has an inner diameter expansion portion at its upper open end, and the inner sealing member (2) abuts against a step portion (51) formed by the bottom wall of the inner diameter expansion portion when in its sealing position and is fluid-tightly connected to the inner diameter expansion portion via a second sealing ring (7).

6. The impurity removal device according to any one of claims 2 to 5, characterized in that: The outer sealing member (31) comprises a sleeve portion (311) detachably connected to the lower open end of the outer support member (5) and open at the upper end and closed at the lower end, and an extension portion (314) extending upward from the closed end of the sleeve portion, wherein the extension portion is configured to abut against the inner sealing member (2) when the outer sealing member (31) is installed so that the inner sealing member overcomes the biasing force and moves from the blocking position to and remains in the open position.

7. The impurity removal device according to claim 6, characterized in that: The adsorption member (32) comprises a magnet sheet which is sleeved on the protruding portion (314) and accommodated in the sleeve portion (311).

8. The impurity removal device according to claim 7, characterized in that: The sleeve portion (311) is connected to the lower open end of the outer support member (5) by means of threaded engagement.

9. A hydraulic oil tank (1), characterized in that The invention comprises the impurity removal device according to any one of claims 1 to 8.

10. A working machine, characterized in that Comprising a hydraulic oil tank (1) according to claim 9.

Images