Hydraulic oil tank with self-cleaning function

Abstract

The application discloses a hydraulic oil tank with a self-cleaning function, which comprises a tank body, an oil inlet pipe and an oil outlet pipe, a vertical communication blowdown pipe is arranged at the bottom surface of the tank body, a blowdown valve and a blowdown pump are arranged at the bottom end of the blowdown pipe along the axial direction of the blowdown pipe, a flow guide ring and a non-return element are arranged in the blowdown pipe, the axial center line of the flow guide ring is vertically arranged, and the outer peripheral surface of the flow guide ring is fixedly connected with the inner peripheral surface of the blowdown pipe, the buoyancy of the non-return element in the hydraulic oil is greater than the gravity of the non-return element, and the bottom end of the flow guide ring is overlapped and sealed with the non-return element. When the hydraulic oil tank stops running, the oil dirt in the hydraulic oil is deposited to the bottom of the tank body under the action of gravity, and the oil dirt is discharged through the blowdown pipe, so that the self-cleaning function of the hydraulic oil is realized, and the cleanliness of the hydraulic oil is improved. The arrangement of the non-return element can prevent the oil dirt from returning to the tank body from the blowdown pipe, and the self-cleaning effect of the hydraulic oil is ensured. The arrangement of the blowdown pump can actively pump out the hydraulic oil in the tank body, increase the blowdown pressure, and improve the cleaning effect of the oil dirt deposited at the bottom of the tank body.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of hydraulic oil tanks, and particularly relates to a hydraulic oil tank with a self-cleaning function. BACKGROUND

[0002] The main function of a hydraulic oil tank is to store oil, and in addition, it also functions to dissipate heat, precipitate impurities, and allow air in the oil to escape. According to whether the liquid surface of the tank is in communication with the atmosphere, the tank can be divided into two types: an open type and a closed type. The open type tank is used in general hydraulic systems, and the closed type tank is used in underwater and hydraulic systems with strict requirements for working stability and noise. During use of the hydraulic equipment, a large amount of impurities will exist in the tank, and the content of the impurities has many types, such as oil sludge, iron filings, metal powder, dust, etc. The existence of these impurities will usually affect the operation of the equipment, and therefore, the inside of the tank needs to be cleaned regularly.

[0003] The existing way of cleaning the hydraulic oil tank is to drain the hydraulic oil inside the hydraulic oil tank, then clean the inside of the hydraulic oil tank, and then replace the new hydraulic oil. Although this way can achieve cleaning of the hydraulic oil, it is time-consuming and labor-intensive, and also increases the amount of hydraulic oil, indirectly increasing the use cost. There is also a filter machine for filtering the hydraulic oil inside the hydraulic oil tank, but the additional filter machine not only increases the equipment procurement cost, but also requires regular replacement of the filter material during subsequent use, further increasing the use cost of the equipment.

[0004] Therefore, it is necessary to improve the existing hydraulic oil tank. SUMMARY

[0005] The present application aims to overcome the defects in the prior art, and provides a hydraulic oil tank with a self-cleaning function, which improves the cleanliness of the hydraulic oil by cleaning the impurities inside the hydraulic oil tank.

[0006] To achieve the above-mentioned purpose, the specific technical scheme of the hydraulic oil tank with a self-cleaning function is as follows:

[0007] A hydraulic oil tank with a self-cleaning function, comprising a tank body, an oil inlet pipe arranged on the top of the tank body, and an oil outlet pipe arranged on the bottom of the tank body, a blowdown pipe vertically communicating with the bottom surface of the tank body, a blowdown valve and a blowdown pump distributed along the axial direction of the bottom end of the blowdown pipe, a flow guide ring and a non-return element arranged inside the blowdown pipe, the axial center line of the flow guide ring being vertically arranged, and the outer peripheral surface of the flow guide ring being fixedly connected with the inner peripheral surface of the blowdown pipe, the buoyancy of the non-return element in the hydraulic oil being greater than its own gravity, so that the non-return element is sealed with the bottom end of the flow guide ring.

[0008] Preferably, in order to make the oil dirt in the bottom of the box gather at the drain pipe, and reduce the accumulation of oil dirt in the bottom of the box, the bottom surface of the box has a hopper part, the top end of the drain pipe communicates with the bottom end of the hopper part, and the hopper part is provided with a vibrator.

[0009] Preferably, in order to slow down the flow rate of hydraulic oil at the hopper part, and facilitate the precipitation of oil dirt, the inner bottom surface of the box is vertically provided with an oil separation plate, the hopper part and the oil outlet pipe are arranged on the two sides of the oil separation plate, and the oil inlet pipe and the hopper part are located on the same side of the oil separation plate.

[0010] Preferably, in order to prevent the oil dirt entering the inside of the drain pipe from flowing back to the inside of the box, the reverse prevention part comprises a connecting rod penetrating through the flow guide ring, the top end and the bottom end of the connecting rod are respectively provided with a floating head and a reverse prevention block, and a drain passage is arranged between the connecting rod and the flow guide ring and between the reverse prevention block and the drain pipe.

[0011] Preferably, in order to facilitate the gathering of oil dirt and improve the stability of the connection between the reverse prevention block and the flow guide ring, the inner side of the opening at both ends of the flow guide ring is a tapered structure, and the top end of the reverse prevention block is tapered to match the bottom end of the flow guide ring.

[0012] Preferably, in order to realize the self-cleaning of the reverse prevention block, the bottom end of the reverse prevention block is a tapered or hemispherical structure, and the bottom end of the reverse prevention block is provided with a propeller.

[0013] Preferably, in order to facilitate the adjustment of the gravity of the floating head, the floating head is internally provided with a sealed cavity.

[0014] Preferably, in order to improve the gathering effect of the hopper part on oil dirt, the vibrator comprises a fixed seat, the top surface of the fixed seat is attached to the bottom surface of the hopper part, the fixed seat is provided with a mounting hole, and a vibrating motor is inserted and matched in the mounting hole.

[0015] Preferably, in order to improve the gathering effect of the flow guide ring on oil dirt, the inner wall of the flow guide ring is provided with a flow guide groove, and the flow guide groove is spirally distributed along the axial direction of the flow guide ring.

[0016] Preferably, in order to reduce the accumulation of oil dirt on the drain pipe and the reverse prevention part, the inner wall of the flow guide ring, the inner wall of the drain pipe and the outer surface of the reverse prevention part are all provided with an oil dirt resistant coating.

[0017] The hydraulic oil tank with the self-cleaning function has the following advantages: when the hydraulic oil tank stops running, the oil dirt inside the hydraulic oil is deposited to the bottom of the tank under the action of gravity and is discharged through the drain pipe, so that the self-cleaning function of the hydraulic oil is realized, and the cleanliness of the hydraulic oil is improved; the setting of the check member can prevent the oil dirt from returning to the tank from the drain pipe, and the self-cleaning effect of the hydraulic oil is ensured; the setting of the drain pump can actively pump out the hydraulic oil inside the tank, increase the drain pressure, and improve the cleaning effect on the oil dirt deposited at the bottom of the tank; through the combination of automatic drainage and active drainage, the convenience and cleaning effect of the hydraulic oil tank are greatly improved, and no additional consumables are needed in the cleaning process, so that the equipment use cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic view of the hydraulic oil tank of the present application;

[0019] Figure 2 is a structural schematic view of the installation structure of the drain pipe of the present application;

[0020] Figure 3 is a structural schematic view of the internal structure of the tank of the present application;

[0021] Figure 4 is a structural schematic view of the internal structure of the drain pipe of the present application;

[0022] Figure 5 is a structural schematic view of the installation structure of the check member of the present application;

[0023] Figure 6 is a structural schematic view of the vibrator of the present application;

[0024] Figure 7 is a structural schematic view of the drain pipe of the present application;

[0025] Figure 8 is a structural schematic view of the check member of the present application;

[0026] Marked in the figure: 1, tank; 2, drain pipe; 3, vibrator; 4, drain valve; 5, drain pump; 6, check member; 7, propeller; 11, oil inlet pipe; 12, oil outlet pipe; 13, conical hopper part; 14, oil separation plate; 21, flow guide ring; 22, flow guide groove; 31, fixed seat; 32, vibration motor; 61, check block; 62, connecting rod; 63, floating head. DETAILED DESCRIPTION

[0027] The specific embodiments of the present application are further described below in combination with the drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present application, and cannot be used to limit the protection scope of the present application.

[0028] The "top surface", "bottom", "bottom surface" are referenced to the normal use state of the hydraulic oil tank, and are only used for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application.

[0029] The hydraulic oil tank is a special container for storing hydraulic oil in a hydraulic system. The hydraulic oil is sucked from the tank by the hydraulic system, and after a working cycle, the hydraulic oil is returned to the tank. During the operation of the equipment, the metal parts on the equipment will wear against each other, generating some metal debris particles. These metal debris particles will enter the hydraulic oil. If the impurities in the hydraulic oil cannot be removed in time, the lubrication effect of the hydraulic oil on the equipment will be affected, and the failure rate of the equipment operation will be increased.

[0030] In order to solve the above problems, as shown in Figure 1 and Figure 4 , a hydraulic oil tank with a self-cleaning function, comprising a tank body 1, an oil inlet pipe 11 arranged at the top of the tank body 1, and an oil outlet pipe 12 arranged at the bottom of the tank body 1, a vertical communication of the tank body 1 bottom surface has a blowdown pipe 2, the bottom end of the blowdown pipe 2 is distributed with a blowdown valve 4 and a blowdown pump 5 along its axial direction, a flow guide ring 21 and a non-return element 6 are arranged inside the blowdown pipe 2, the axis of the flow guide ring 21 is vertically arranged, and the outer peripheral surface thereof is fixedly connected with the inner peripheral surface of the blowdown pipe 2, the buoyancy of the non-return element 6 in the hydraulic oil is greater than its own gravity, so that the non-return element 6 is lapped and sealed with the bottom end of the flow guide ring 21.

[0031] When the equipment stops running, the hydraulic oil flows back to the inside of the tank body 1 and stops flowing. The oil dirt and impurities in the hydraulic oil will be deposited at the bottom of the tank body 1 under the action of gravity. When the hydraulic oil is static, the water in the hydraulic oil will also accumulate at the bottom of the tank body 1. The water and oil dirt and impurities at the bottom of the tank body 1 enter the blowdown pipe 2 and accumulate above the non-return element 6. Since the buoyancy of the non-return element 6 in the hydraulic oil is greater than its own gravity, under normal circumstances, the non-return element 6 will abut against the bottom of the flow guide ring 21, and a sealed state is formed between the flow guide ring 21 and the non-return element 6. The weight of the oil dirt and impurities accumulated above the non-return element 6 acts on the non-return element 6. When the gravity of the two is greater than the buoyancy of the non-return element 6, the non-return element 6 is pushed to move downward. At this time, the bottom end of the flow guide ring 21 is opened, so that the oil dirt and impurities can pass through and move to the bottom end of the blowdown pipe 2 and finally be discharged, thereby realizing the self-cleaning function of the hydraulic oil, improving the quality of the hydraulic oil, and reducing the failure rate of the equipment operation. When the oil dirt and impurities on the non-return element 6 pass through the flow guide ring 21, the non-return element 6 floats up and resets under the action of the buoyancy, and a sealed state is formed between the flow guide ring 21 and the non-return element 6 again. At this time, the non-return element 6 can prevent the oil dirt and impurities at the bottom of the blowdown pipe 2 from flowing back, thereby maintaining the cleanliness of the hydraulic oil inside the tank body 1 and preventing the hydraulic oil from being polluted again.

[0032] The bottom of the drain pipe 2 is provided with a drain pump 5. The drain pump 5 can increase the discharge pressure of the oil impurities in the drain pipe 2, thereby actively pumping out the oil impurities, improving the cleaning effect of the oil impurities deposited at the bottom of the tank 1, and also achieving flushing of the check member 6 and the drain pipe 2 to remove the oil impurities accumulated on the surfaces of the two, and playing a role of dredging the drain pipe 2. The drain pump 2 can work regularly to improve the self-cleaning effect of the hydraulic oil in the hydraulic oil tank, while reducing the working time of the drain pump 2 and reducing energy consumption.

[0033] Compared with filtering the hydraulic oil through the filtering device, the above-mentioned way of allowing the hydraulic oil to stand and deposit to achieve self-cleaning of the hydraulic oil can also remove water in the hydraulic oil. Under normal circumstances, the density of the hydraulic oil is 0.8 g / cm³-0.9 g / cm³, and the density of water is 1 g / cm³. Therefore, the density of water is greater than that of the hydraulic oil. When the hydraulic oil is stationary, the water mixed in the hydraulic oil will also accumulate at the bottom of the tank 1, thereby being discharged through the drain pipe 2, further improving the quality of the hydraulic oil.

[0034] Further improvement is that, as shown in Figure 3 and Figure 4 , the bottom surface of the tank has a conical hopper portion 13, the top end of the drain pipe 2 communicates with the bottom end of the conical hopper portion 13, and the conical hopper portion 13 is provided with a vibrator 3. The inner wall of the conical hopper portion 13 is a slope, so that the oil impurities deposited at the bottom of the tank 1 can be gathered along the slope to the bottom end of the conical hopper portion 13, and then enter the inside of the drain pipe 2. The conical hopper portion 13 plays a role of gathering oil impurities, reduces the accumulation of oil impurities at the bottom of the tank 1, and improves the cleaning effect of the hydraulic oil. At the same time, the conical hopper portion 13 is vibrated by the vibrator 3 to shake the oil impurities at the bottom of the conical hopper portion 13 into the inside of the drain pipe 2, further reducing the accumulation of oil impurities in the tank 1.

[0035] Further improvement is that, as shown in Figure 6 , the vibrator 3 includes a fixed seat 31, the top surface of the fixed seat 31 is attached to the bottom surface of the conical hopper portion 13, the fixed seat 31 is provided with a mounting hole, and a vibration motor 32 is inserted and connected in the mounting hole. The vibration motor 32 is connected with the conical hopper portion 13 through the fixed seat 31, improving the convenience and stability of the installation of the vibration motor 32. The fixed seat 31 is attached to the conical hopper portion 13, which can improve the efficiency of vibration transmission and the vibration effect of the conical hopper portion 13. The mounting hole of the fixed seat 31 has an angle between the axial direction and the vertical direction, so that when the vibration motor 32 is inserted into the mounting hole, it can be inserted along the slope, the disassembly path of the vibration motor 32 avoids the conical hopper portion 13, reduces the obstruction, and improves the convenience of disassembly.

[0036] Further improvement is that, as shown in Figure 3As shown, the inner bottom surface of the box body 1 is vertically provided with an oil separation plate 14, the oil outlet pipe 12 and the oil inlet pipe 11 are arranged on the two sides of the oil separation plate 14, and the oil inlet pipe 11 and the oil cone part 13 are arranged on the same side of the oil separation plate 14. The oil separation plate 14 is arranged at the bottom of the box body 1 and separates the oil outlet pipe 12 and the drain pipe 2 on the two sides. When the hydraulic oil flows back into the box body 1 from the oil inlet pipe 11, the hydraulic oil is located on the side of the oil separation plate 14 close to the drain pipe 2. Because the flow rate of the hydraulic oil at the oil inlet pipe 11 is fast, the flow rate of the hydraulic oil can be reduced through the buffering of the oil separation plate 14, so that more oil dirt and impurities in the hydraulic oil can be precipitated. Then, the hydraulic oil with reduced flow rate flows out from the oil outlet pipe 12, which can reduce the number of oil dirt and impurities entering the oil outlet pipe 12 and improve the quality of the hydraulic oil circulating into the equipment.

[0037] The oil separation plate 14 can be a filter plate with small holes. In this way, the oil separation plate 14 can filter the hydraulic oil while buffering the hydraulic oil, further reducing the number of oil dirt and impurities entering the oil outlet pipe 12.

[0038] Further improvement is that, as shown in Figure 4 、 Figure 5 and Figure 8 , the check member 6 includes a connecting rod 62 penetrating the flow guide ring 21, the top end and the bottom end of the connecting rod 62 are respectively provided with a floating head 63 and a check block 61, and a drain passage is arranged between the connecting rod 62 and the flow guide ring 21 and between the check block 61 and the drain pipe 2.

[0039] In the above arrangement, the floating head 63 generates a buoyancy in the hydraulic oil, which pulls the check block 61 upward, the check block 61 cooperates with the flow guide ring 21 to prevent the backflow of oil dirt and impurities, and the connecting rod 62 is used to connect the floating head 63 and the check block 61. During operation, the floating head 63 first pulls the check block 61 upward, so that the check block 61 is tightly attached to the flow guide ring 21 to achieve sealing. The oil dirt and impurities accumulate on the top of the check block 61 after passing through the flow guide ring 21. When the number of oil dirt and impurities is large and the total weight is greater than the buoyancy, the check block 61 is pushed downward, so that the check block 61 is separated from the flow guide ring 21. Then, the oil dirt and impurities move downward into the drain pipe 2 and are discharged from the bottom of the drain pipe 2. When the amount of oil dirt and impurities on the top of the check block 61 is reduced, the check block 61 moves upward under the action of the buoyancy to reset and seal the flow guide ring 21 again, preventing the backflow of oil dirt and impurities in the drain pipe 2 to maintain the cleanliness of the hydraulic oil.

[0040] In the structure of the check member 6, the outer diameter of the connecting rod 62 is smaller than the inner diameter of the flow guide ring 21, the length of the connecting rod 62 is greater than the length of the flow guide ring 21, the check block 61 is vertically arranged in a columnar shape, and the outer diameter of the check block 61 is smaller than the inner diameter of the drain pipe 2, so that the drain pipe 2 can form a drain passage that is unobstructed upward and downward; the arrangement of the floating head 63 and the connecting rod 62 can also play a positioning role on the check block 61, so as to ensure that the check block 61 and the flow guide ring 21 are in a sealed state when they are connected.

[0041] Further improvement is that, as shown in Figure 6 the inner side of the opening at both ends of the flow guide ring 21 is in a conical structure, and the top end of the check block 61 is in a conical shape matching the bottom end of the flow guide ring 21. The conical structure in the opening at the top of the flow guide ring 21 can smoothly transition with the inner wall of the conical bucket portion 13, and play a role in gathering and guiding oil impurities, reducing the accumulation of oil impurities at the bottom of the tank 1; the conical structure in the opening at the bottom of the flow guide ring 21 matches the top end structure of the check block 61, and plays a positioning role between the check block 61 and the flow guide ring 21, improving the sealing effect when the two are connected.

[0042] Further improvement is that, as shown in Figure 8 the bottom end of the check block 61 is in a conical or hemispherical structure, and the check block 61 is provided with the propeller 7. The conical structure of the bottom end of the check block 61 can make the check block 61 form a relatively smooth streamlined structure as a whole, facilitating the passage of hydraulic oil around the check block 61; the propeller 7 is arranged to be used when the drain pump 5 is used to extract oil impurities. When the drain pump 5 extracts oil impurities in the drain pipe, the flow rate of the hydraulic oil in the drain pipe 2 will be increased, the hydraulic oil will push the propeller 7, and the check block 61 will rotate rapidly along its own axis, so that the oil impurities accumulated on the check block 61 are thrown off under the action of centrifugal force, realizing self-cleaning of the floating head 63, the connecting rod 62 and the check block 61, and further ensuring the reliability of the subsequent work; at the same time, the rotation of the propeller 7 can also generate a thrust on the check block 61, cooperating with the buoyancy of the floating head 63 to make the check block 61 float in the drain pipe 2, reduce the contact area of the check block 61 with the drain pipe 2 and the flow guide ring 21, and reduce the resistance of rotation.

[0043] Further improvement is that the floating head 63 is internally provided with a sealed cavity. The arrangement of the cavity can be used to place a weight, so as to change the upward pulling force of the floating head 63 on the check block 61, and realize the setting of the sensitivity of the check block 61.

[0044] Further improvement is that, as shown in Figure 7As shown, the inner wall of the flow guide ring 21 is provided with a flow guide groove 22 which is distributed axially and spirally along the flow guide ring 21. The flow guide groove 22 is provided for use when the oil and dirt are extracted by the sewage pump 5. When the sewage pump 5 is working, the flow rate of the hydraulic oil inside the sewage pipe 2 is accelerated. When the hydraulic oil passes through the flow guide ring 21, it is guided by the flow guide groove 22 to flow downward while rotating around the axis of the flow guide ring 21. The rotating hydraulic oil can form a vortex at the two ends of the flow guide ring 21. The vortex at the top opening of the flow guide ring 21 can collect the oil and dirt around it and then be sucked into the inside of the sewage pipe 2, improving the sewage effect of the sewage pipe 2. The vortex at the bottom end of the flow guide ring 21 can accelerate the rotation speed of the check block 61, increase the centrifugal force on the oil and dirt on the check block 61, and improve the self-cleaning effect of the check block 61.

[0045] Further improvement is that the inner wall of the flow guide ring 21, the inner wall of the sewage pipe 2 and the outer surface of the check member 6 are all provided with an anti-oil coating. The anti-oil coating includes an epoxy primer layer and a polytetrafluoroethylene layer arranged in sequence. The epoxy primer can play a role in preventing corrosion and prolonging the service life of each component. The polytetrafluoroethylene layer has the characteristics of oil-repellent, which can reduce the accumulation of oil and dirt on each component, and at the same time has good lubricating effect, improving the smoothness of the rotation of the check block 61.

[0046] In the above-mentioned hydraulic oil tank, when the hydraulic oil is in a static state, the oil and dirt can be deposited at the bottom of the tank 1 under the action of gravity and be collected into the inside of the sewage pipe 2, and then be discharged through the sewage pipe 2, realizing the self-cleaning effect of the hydraulic oil and improving the quality of the hydraulic oil. At the same time, the arrangement of the check block 61 and the flow guide ring 21 can prevent the oil and dirt entering the inside of the sewage pipe 2 from flowing back, so as to maintain the cleanliness of the hydraulic oil. The arrangement of the sewage pump 5 can increase the sewage pressure of the sewage pipe 2 and improve the sewage effect. When the sewage pump 5 is discharging, it can cooperate with the propeller 7 to make the check block 61 rotate, so as to realize the self-cleaning of the check block 61 under the action of centrifugal force. When the flow guide groove 22 is used, the rotation of the hydraulic oil inside the sewage pipe 2 can generate a vortex, realizing the collection of the oil and dirt at the bottom of the tank 1 and improving the self-cleaning effect of the hydraulic oil. Through the combination of automatic and active sewage methods, the cleaning of the hydraulic oil tank is more convenient, the sewage effect is guaranteed, and there is no consumption loss during the sewage process, reducing the use cost.

[0047] It is to be understood that the present application is described by way of example only, and that modifications or alterations can be made to the features and embodiments described without departing from the spirit and scope of the application. In addition, modifications can be made to the features and embodiments described to accommodate specific situations and materials without departing from the spirit and scope of the application. Accordingly, the application is not limited to the specific embodiments disclosed herein, but rather, the scope of the application includes all embodiments falling within the scope of the claims.

Claims

1. A hydraulic oil tank with self-cleaning function, comprising a tank body (1), an oil inlet pipe (11) arranged on the top of the tank body (1), and an oil outlet pipe (12) arranged on the bottom of the tank body (1), characterized in that: a vertical drain pipe (2) is arranged on the bottom surface of the tank body (1), a drain valve (4) and a drain pump (5) are arranged on the bottom end of the drain pipe (2) along the axial direction thereof, a flow guide ring (21) and a non-return element (6) are arranged inside the drain pipe (2), the axial center line of the flow guide ring (21) is arranged vertically, and the outer peripheral surface thereof is fixedly connected with the inner peripheral surface of the drain pipe (2), the buoyancy of the non-return element (6) in the hydraulic oil is greater than its own gravity, so that the non-return element (6) is sealed in overlap with the bottom end of the flow guide ring (21); the non-return element (6) comprises a connecting rod (62) arranged through the flow guide ring (21), an upper floating head (63) and a non-return block (61) are arranged on the top end and the bottom end of the connecting rod (62) respectively, and a drain passage is arranged between the connecting rod (62) and the flow guide ring (21) and between the non-return block (61) and the drain pipe (2); the bottom end of the non-return block (61) is in a conical or hemispherical structure, and a propeller (7) is arranged on the bottom end of the non-return block (61).

2. The hydraulic oil tank having a self-cleaning function according to claim 1, characterized by, a conical hopper (13) is arranged on the bottom surface of the tank body (1), the top end of the drain pipe (2) is communicated with the bottom end of the conical hopper (13), and a vibrator (3) is arranged on the conical hopper (13).

3. The hydraulic oil tank having a self-cleaning function according to claim 2, characterized by, an oil separation plate (14) is arranged vertically on the inner bottom surface of the tank body (1), the conical hopper (13) and the oil outlet pipe (12) are arranged on the two sides of the oil separation plate (14) respectively, and the oil inlet pipe (11) and the conical hopper (13) are arranged on the same side of the oil separation plate (14).

4. The hydraulic oil tank having a self-cleaning function according to claim 1, characterized by, the inner sides of the two ends of the flow guide ring (21) are in a conical structure, and the top end of the non-return block (61) is in a conical structure matching the bottom end of the flow guide ring (21).

5. The hydraulic oil tank having a self-cleaning function according to claim 1, wherein a sealed cavity is arranged inside the upper floating head (63).

6. The hydraulic oil tank having a self-cleaning function according to claim 2, wherein the vibrator (3) comprises a fixed seat (31), the top surface of the fixed seat (31) is attached to the bottom surface of the conical hopper (13), the fixed seat (31) is provided with a mounting hole, and a vibration motor (32) is inserted and connected in the mounting hole.

7. The hydraulic oil tank having a self-cleaning function according to claim 1, wherein a flow guide groove (22) is arranged on the inner wall of the flow guide ring (21), and the flow guide groove (22) is arranged spirally along the axial direction of the flow guide ring (21).

8. The hydraulic oil tank having a self-cleaning function according to claim 7, characterized by, an oil stain resistant coating is arranged on the inner wall of the flow guide ring (21), the inner wall of the drain pipe (2), and the outer surface of the non-return element (6).

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