Hydraulic oil tank for hydraulic station

Abstract

The utility model relates to the technical field of accessory devices of hydraulic oil tanks, in particular to a hydraulic oil tank for a hydraulic station, which can filter hydraulic oil entering a cavity and give an early warning when the pressure in the cavity is too low or the hydraulic oil is insufficient, so that the practicability of the hydraulic oil tank for the hydraulic station is enhanced. Comprising a hydraulic oil tank, a first cover plate and four sets of first screws, four sets of mounting threaded holes are formed in the top end of the hydraulic oil tank, four sets of mounting through holes are formed in the top end of the first cover plate, and the four sets of first screws are in threaded connection with the mounting threaded holes through the mounting through holes correspondingly; a filtering assembly is arranged in the oil inlet pipe, an oil outlet assembly is arranged in the oil outlet pipe, a pressurizing assembly is arranged at the top end of the first cover plate, a cavity is formed in the hydraulic oil tank, and a secondary filtering assembly is arranged in the cavity.

Description

Technical Field

[0001] The utility model relates to the technical field of auxiliary devices for hydraulic oil tanks, in particular to a hydraulic oil tank for a hydraulic station. Background Technique

[0002] As is well known, at present, most hydraulic stations are equipped with return oil filters to filter out most of the foaming raw materials, but there are still some tiny particles that will enter the oil tank, or the filter screen is not replaced in time, resulting in a discounted filtering effect, and the foaming principle or other impurities will be sucked into the oil pump and enter the hydraulic system along with the return oil circulation, resulting in machine failures, seriously affecting normal production and the service life of hydraulic components;

[0003] For example, the patent publication number CN 215444554 U discloses a hydraulic oil tank for a hydraulic station, which includes an oil tank body and an oil cooling mechanism arranged inside the oil tank body. A detachable cover plate is provided at the top of the oil tank body. A partition is vertically downwardly provided in the middle of the detachable cover plate and divides the inside of the oil tank body into left and right sides. A stainless steel filter screen plate is provided at the bottom of the partition, and the stainless steel filter screen plate abuts against the bottom of the oil tank body; A pair of oil discharge ports are symmetrically arranged on the left and right at the bottom of the oil tank body. A return oil pipe penetrates through the left side of the detachable cover plate, and a suction pipe penetrates through the right side of the detachable cover plate. The utility model filters and cools the hydraulic oil, improves the service life of the hydraulic system, reduces the failure rate of the machine, and improves the productivity of the hydraulic station;

[0004] There are still some problems in the above patent during use, lacking the functions of filtering and warning the oil inside the oil tank, so the practicability is poor. Content of the Utility Model

[0005] In order to solve the above technical problems, the utility model provides a hydraulic oil tank for a hydraulic station, which can filter the hydraulic oil entering the chamber and give an alarm when the pressure in the chamber is too low or the hydraulic oil is insufficient, thereby enhancing the practicability of the hydraulic oil tank.

[0006] A hydraulic oil tank for a hydraulic station of the utility model includes a hydraulic oil tank, a first cover plate and four groups of first screws. Four groups of installation threaded holes are arranged at the top end of the hydraulic oil tank, and four groups of installation through holes are arranged at the top end of the first cover plate. The four groups of first screws are respectively threadedly connected to the installation threaded holes through the installation through holes. An oil inlet pipe and an oil outlet pipe are arranged at the top end of the first cover plate. A filtering component is arranged in the oil inlet pipe, and an oil outlet component is arranged in the oil outlet pipe. A pressurizing component is arranged at the top end of the first cover plate. A chamber is arranged in the hydraulic oil tank, a secondary filtering component is arranged inside the chamber, a detection component is arranged at the front end of the hydraulic oil tank, and a reinforcement component is arranged on the outer wall of the hydraulic oil tank.

[0007] Preferably, the filtering component includes a first sleeve, a fixed threaded block, a collar, an oil accumulating pipe, a filter net cover, four support rods and four flow dividing plates. The inner end of the first sleeve is provided with a first thread, and the outer wall of the oil inlet pipe is provided with a second thread. The first thread is threadedly connected to the second thread. The top of the first sleeve is provided with an oil inlet. A sealing component is arranged in the oil inlet pipe. The bottom end of the first cover plate is connected to the fixed threaded block. The top of the fixed threaded block is provided with four first through holes. The bottom end of the collar is connected to the oil accumulating pipe. The bottom end of the collar is connected to the filter net cover. The inner wall of the collar is provided with a third thread. The fixed threaded block is threadedly connected to the collar. The bottom end of the collar is connected to four support rods. The bottom ends of the four support rods are connected to the flow dividing plates.

[0008] Preferably, the sealing component includes a cross, two sliding rods and a fixed block. The top of the cross is connected to the two sliding rods. The top ends of the two sliding rods are connected to the fixed block. The top of the sealing block is provided with two first through holes. The two first through holes are respectively slidably sleeved with the sliding rods. Springs are respectively arranged on the outer walls of the two sliding rods. The fixed block and the cross are respectively slidably sleeved with the inner wall of the oil inlet pipe.

[0009] Preferably, the pressurizing component includes two first support blocks, two clamping rings and a cover. The top of the cover plate is provided with a pressurizing pipe. The left end and the right end of the pressurizing pipe are respectively connected to the first support blocks. The cover is clamped to the pressurizing pipe. The inner end of the cover is provided with a sealing gasket. The left end and the right end of the cover are respectively provided with clamping blocks. The two first support blocks are respectively hinged to the clamping rings. The two clamping rings are respectively clamped and fixed to the clamping blocks. The front end of the pressurizing pipe is provided with a pressurizing head.

[0010] Preferably, the oil outlet component includes a second sleeve. The outer wall of the oil outlet pipe is provided with a fourth thread. The inner end of the second sleeve is provided with a fifth thread. The fourth thread is threadedly connected to the fifth thread. A drain pipe is arranged on the second sleeve. A valve is arranged at the right end of the drain pipe. The drain pipe is inserted into the chamber.

[0011] Preferably, the secondary filtering component includes two support platforms, a dust-proof filter net and four second screws. The left end and the right end of the chamber are respectively connected to the support platforms. The tops of the two support platforms are provided with two fixed threaded holes. The top of the dust-proof filter net is provided with four fixed through holes. The four second screws respectively pass through the fixed through holes and are threadedly connected to the fixed threaded holes.

[0012] Preferably, the detection component includes a float type water level detector and a two-color alarm. A pressure gauge is arranged at the front end of the hydraulic oil tank. The pressure gauge is hermetically inserted into the chamber. The float type water level detector hermetically passes through the front end of the hydraulic oil tank. The top of the first cover plate is connected to the two-color alarm. A control main board is arranged at the front end of the hydraulic oil tank.

[0013] Preferably, the reinforcement component includes sixteen groups of reinforcement rods, a second cover plate and four groups of third screws. The top end of the bottom plate is connected to the sixteen groups of reinforcement rods, the inner ends of the sixteen groups of reinforcement rods are in close contact with the hydraulic oil tank, a clamping groove is provided at the bottom end of the second cover plate, the clamping groove is clamped with the outer walls of the sixteen groups of reinforcement rods, four first through holes are provided at the top end of the second cover plate, first threaded holes are respectively provided on the reinforcement rods at the four corners, and the four groups of third screws are respectively threadedly connected to the first threaded holes through the first through holes.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows: when using the hydraulic oil tank, place it in a suitable position, then filter the hydraulic oil through the inlet pipe and the filtering component, and then perform secondary filtering through the secondary filtering component. Then the hydraulic oil enters the chamber, and then the detection component detects the changes in the water level of the hydraulic oil and the pressure in the chamber. When the hydraulic oil is too low and the pressure in the chamber is too low, the dual-color alarm will give an early warning. Then during normal use, when it is necessary to pump out the hydraulic oil, open the valve on the drain pipe, and the pressure in the chamber will push the hydraulic oil out through the drain pipe, thus facilitating the use of the hydraulic oil tank, and therefore enhancing the practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic connection structure diagram of the present utility model;

[0016] Figure 2 is a schematic connection structure diagram of the chamber and the support platform of the present utility model;

[0017] Figure 3 is a schematic connection structure diagram of the sliding rod and the fixing plate of the present utility model;

[0018] Figure 4 is a schematic partial enlarged structure diagram of the present utility model;

[0019] Reference numerals in the drawings: 1, hydraulic oil tank; 2, first cover plate; 3, first screw; 4, inlet pipe; 5, outlet pipe; 6, chamber; 7, first sleeve; 8, fixed thread block; 9, collar; 10, oil collecting pipe; 11, filter mesh cover; 12, support rod; 13, flow dividing plate; 14, cross; 15, sliding rod; 16, fixed block; 17, sealing block; 18, spring; 19, first support block; 20, clamping ring; 21, lid; 22, pressure pipe; 23, gasket; 24, clamping block; 25, pressure head; 26, second sleeve; 27, drain pipe; 28, valve; 29, support platform; 30, dust filter screen; 31, second screw; 32, float water level detector; 33, dual-color alarm; 34, control main board; 35, reinforcement rod; 36, second cover plate; 37, third screw; 38, pressure gauge; 39, bottom plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following will further describe in detail the specific implementation manners of the present utility model in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0021] As Figures 1 to 4 shown, a hydraulic oil tank for a hydraulic station of the present utility model includes a hydraulic oil tank 1, a first cover plate 2, and four groups of first screws 3. Four groups of installation threaded holes are provided at the top of the hydraulic oil tank 1, and four groups of installation through holes are provided at the top of the first cover plate 2. The four groups of first screws 3 are respectively threadedly connected to the installation threaded holes through the installation through holes. An oil inlet pipe 4 and an oil outlet pipe 5 are provided at the top of the first cover plate 2. A filtering component is provided in the oil inlet pipe 4, and an oil outlet component is provided in the oil outlet pipe 5. A pressurizing component is provided at the top of the first cover plate 2. A chamber 6 is provided in the hydraulic oil tank 1, and a secondary filtering component is provided inside the chamber 6. A detection component is provided at the front end of the hydraulic oil tank 1, and a reinforcement component is provided on the outer wall of the hydraulic oil tank 1; when using the hydraulic oil tank, place it in a suitable position, and then filter the hydraulic oil through the oil inlet pipe and the filtering component. Then, perform secondary filtering through the secondary filtering component. Then, the hydraulic oil enters the chamber, and then detect the changes in the water level of the hydraulic oil and the pressure inside the chamber through the detection component. When the hydraulic oil is too low and the pressure inside the chamber is too low, the dual-color alarm will give an early warning. Then, during normal use, when it is necessary to pump out the hydraulic oil, open the valve on the drain pipe, and the pressure inside the chamber will push the hydraulic oil out from the drain pipe, thus facilitating the use of the hydraulic oil tank, and therefore enhancing the practicability.

[0022] As a preference of the above embodiment, the filtering component includes a first sleeve 7, a fixed threaded block 8, a collar 9, an oil collecting pipe 10, a filter mesh cover 11, four groups of support rods 12, and four groups of flow dividing plates 13. A first thread is provided at the inner end of the first sleeve 7, and a second thread is provided on the outer wall of the oil inlet pipe 4. The first thread is threadedly connected to the second thread. An oil inlet is provided at the top of the first sleeve 7, and a sealing component is provided in the oil inlet pipe 4. The bottom end of the first cover plate 2 is connected to the fixed threaded block 8. Four groups of first through holes are provided at the top of the fixed threaded block 8. The bottom end of the collar 9 is connected to the oil collecting pipe 10, and the bottom end of the collar 9 is connected to the filter mesh cover 11. A third thread is provided on the inner wall of the collar 9. The fixed threaded block 8 is threadedly connected to the collar 9. The bottom end of the collar 9 is connected to four groups of support rods 12, and the bottom ends of the four groups of support rods 12 are connected to the flow dividing plates 13; when the hydraulic oil enters the chamber through the oil inlet pipe, it will push the sealing component downward, and then the hydraulic oil will first pass through the filter mesh cover for preliminary filtering, and the filtered hydraulic oil will be collected through the oil collecting pipe. After that, the collected hydraulic oil is dispersed by the flow dividing plates and then undergoes secondary filtering of the hydraulic oil through the secondary filtering component, thereby preventing dust and particulate matter from entering the bottom of the wall and flowing through the pipeline, and therefore enhancing the practicability.

[0023] Preferably, as in the above embodiment, the sealing assembly includes a cross 14, two sets of slide bars 15 and fixing blocks 16. The top of the cross 14 is connected to the two sets of slide bars 15, and the tops of the two sets of slide bars 15 are connected to the fixing blocks 16. Two first through holes are provided at the top of the sealing block 17, and the two first through holes are respectively slidably sleeved on the slide bars 15. Springs 18 are respectively provided on the outer walls of the two sets of slide bars 15. The fixing blocks 16 and the cross 14 are respectively slidably sleeved on the inner wall of the oil inlet pipe 4. Before the first sleeve is threadedly connected to the oil inlet pipe, the sealing assembly is placed inside the inner end of the oil inlet pipe. Then, when refueling the chamber, the sealing block needs to be pushed downward to allow the hydraulic oil to enter the chamber. Then, when the oil inlet pipe is pulled out, the two springs will drive the two sealing blocks to rebound upward. After that, the pressure in the chamber will also push the sealing block to fit more tightly with the fixing block, thereby preventing the leakage of hydraulic oil and enhancing the practicality.

[0024] Preferably, as in the above embodiment, the pressurizing assembly includes two first support blocks 19, two clamping rings 20 and a lid 21. A pressurizing pipe 22 is provided at the top of the cover plate. The left end and the right end of the pressurizing pipe 22 are respectively connected to the first support blocks 19. The lid 21 is clamped on the pressurizing pipe 22. A sealing gasket 23 is provided at the inner end of the lid 21. Clamping blocks 24 are respectively provided at the left end and the right end of the lid 21. The two first support blocks 19 are respectively hinged to the clamping rings 20, and the two clamping rings 20 are respectively clamped and fixed to the clamping blocks 24. A pressurizing head 25 is provided at the front end of the pressurizing pipe 22. The two hinged clamping rings and the two clamping blocks on the lid can be used to transform and fix the clamping of the pressurizing pipe, thereby preventing pressure leakage. And the chamber can be pressurized through the pressurizing head, thus enhancing the practicality.

[0025] Preferably, as in the above embodiment, the oil outlet assembly includes a second sleeve 26. A fourth thread is provided on the outer wall of the oil outlet pipe 5, and a fifth thread is provided at the inner end of the second sleeve 26. The fourth thread is threadedly connected to the fifth thread. A drain pipe 27 is provided on the second sleeve 26. A valve 28 is provided at the right end of the drain pipe 27. The drain pipe 27 is inserted into the chamber 6. The drain pipe can be inserted into the oil outlet pipe through the second sleeve and fixed by the fourth thread and the fifth thread. And the oil outlet pipe can be controlled through the valve, thereby enhancing the practicality.

[0026] Preferably, as in the above embodiment, the secondary filtering assembly includes two support platforms 29, a dust filter screen 30 and four second screws 31. The left end and the right end of the chamber 6 are respectively connected to the support platforms 29. Two fixing threaded holes are provided at the tops of the two support platforms 29. Four fixing through holes are provided at the top of the dust filter screen 30. The four second screws 31 respectively pass through the fixing through holes and are threadedly connected to the fixing threaded holes. The fine metal particles and dust in the hydraulic oil can be filtered through the dust filter screen, thereby enhancing the practicality.

[0027] Preferably, as in the above embodiment, the detection component includes a float water level detector 32 and a two-color alarm 33. A pressure gauge 38 is provided at the front end of the hydraulic oil tank 1. The pressure gauge 38 is sealed and inserted into the chamber 6. The float water level detector 32 penetrates through the front end of the hydraulic oil tank 1 in a sealed manner. The top end of the first cover plate 2 is connected to the two-color alarm 33. A control main board 34 is provided at the front end of the hydraulic oil tank 1. The pressure inside the chamber can be detected by the pressure gauge, and the water level of the hydraulic oil in the chamber can be detected by the float water level detector. When the water level is too low or the pressure is too low, the two-color alarm will give an early warning and flash, thus enhancing the practicality.

[0028] Preferably, as in the above embodiment, the reinforcement component includes sixteen groups of reinforcement rods 35, a second cover plate 36 and four groups of third screws 37. The top end of the bottom plate 39 is connected to the sixteen groups of reinforcement rods 35. The inner ends of the sixteen groups of reinforcement rods 35 are in close contact with the hydraulic oil tank 1. A clamping groove is provided at the bottom end of the second cover plate 36. The clamping groove is clamped with the outer walls of the sixteen groups of reinforcement rods 35. Four first through holes are provided at the top end of the second cover plate 36. First threaded holes are respectively provided on the reinforcement rods 35 at the four corners. The four groups of third screws 37 are respectively threadedly connected to the first threaded holes through the first through holes. The stability of the outer wall of the hydraulic oil tank can be enhanced by the sixteen groups of reinforcement rods, the second cover plate and the bottom plate, preventing the deformation of the hydraulic oil tank caused by too high pressure in the chamber, thus enhancing the practicality.

[0029] A hydraulic oil tank for a hydraulic station of the present utility model has the following working principle. When it works, first, place the hydraulic oil tank at a predetermined position, and then fix the first cover plate to the top of the hydraulic oil tank through four groups of first screws to ensure the stable connection of all components. Next, install the filtering component, secondary filtering component, pressurizing component, oil outlet component, detection component, and reinforcement component according to the design requirements, and ensure the correct docking and sealing of each component such as the oil inlet pipe, oil outlet pipe, pressurizing pipe, drain pipe, float type water level detector, etc. Then start the oil inlet process. The hydraulic oil enters through the oil inlet pipe and is first preliminarily filtered by the first sleeve and the filter mesh cover. Subsequently, the hydraulic oil converges in the oil collecting pipe, is then dispersed by the flow dividing plate and deeply filtered by the secondary filtering component (dust-proof filter mesh) to ensure that the oil is clean and free of impurities. Then, the pressure gauge and the float type water level detector continuously monitor the pressure and oil level inside the chamber. Once it is found that the oil level is too low or the pressure is lower than the set value, the control system sends a warning signal through the two-color alarm to remind the operator to replenish the hydraulic oil or adjust the system pressure in a timely manner. After that, when it is necessary to discharge the hydraulic oil, open the valve on the drain pipe, and the hydraulic oil in the chamber is discharged through the drain pipe under the action of pressure, which is convenient for the replacement of the hydraulic oil or the maintenance of the system. Then, when the pressure in the chamber is too low, the operator can inject compressed air or other pressurizing media into the chamber, and the pressure head ensures that the pressurizing process is effective and well-sealed, maintaining the working pressure required by the system. Finally, the installation of the reinforcement component improves the structural strength of the hydraulic oil tank. Especially the cooperation of the sixteen groups of reinforcement rods and the second cover plate effectively prevents the deformation of the tank body caused by external pressure or impact, ensuring the stable operation of the entire system.

[0030] The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0031] In the present utility model, the "first", "second", "third" do not represent specific quantities and sequences, but are only used for the distinction of names.

[0032] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present utility model, several improvements and modifications can still be made, and these improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims

1. A hydraulic oil tank for a hydraulic station, characterized in that, It includes a hydraulic oil tank (1), a first cover plate (2) and four groups of first screws (3). There are four groups of installation threaded holes provided at the top end of the hydraulic oil tank (1), and four groups of installation through holes are provided at the top end of the first cover plate (2). The four groups of first screws (3) are respectively threadedly connected to the installation threaded holes through the installation through holes. An oil inlet pipe (4) and an oil outlet pipe (5) are provided at the top end of the first cover plate (2). A filtering component is provided in the oil inlet pipe (4), and an oil outlet component is provided in the oil outlet pipe (5). A pressurizing component is provided at the top end of the first cover plate (2). A chamber (6) is provided in the hydraulic oil tank (1), and a secondary filtering component is provided inside the chamber (6). A detection component is provided at the front end of the hydraulic oil tank (1), and a reinforcement component is provided on the outer wall of the hydraulic oil tank (1).

2. The hydraulic oil tank for a hydraulic station according to claim 1, wherein, The filtering component includes a first sleeve (7), a fixed threaded block (8), a collar (9), an oil collecting pipe (10), a filter mesh cover (11), four groups of support rods (12) and four groups of flow dividing plates (13). A first thread is provided at the inner end of the first sleeve (7), and a second thread is provided on the outer wall of the oil inlet pipe (4). The first thread is threadedly connected to the second thread. An oil inlet is provided at the top end of the first sleeve (7). A sealing component is provided in the oil inlet pipe (4). The bottom end of the first cover plate (2) is connected to the fixed threaded block (8). Four groups of first through holes are provided at the top end of the fixed threaded block (8). The bottom end of the collar (9) is connected to the oil collecting pipe (10). The bottom end of the collar (9) is connected to the filter mesh cover (11). A third thread is provided on the inner wall of the collar (9). The fixed threaded block (8) is threadedly connected to the collar (9). The bottom end of the collar (9) is connected to the four groups of support rods (12). The bottom ends of the four groups of support rods (12) are connected to the flow dividing plates (13).

3. A hydraulic oil tank for a hydraulic station according to claim 2, characterized in that, The sealing component includes a cross (14), two groups of sliding rods (15) and a fixed block (16). The top end of the cross (14) is connected to the two groups of sliding rods (15). The top ends of the two groups of sliding rods (15) are connected to the fixed block (16). Two groups of first through holes are provided at the top end of the sealing block (17). The two groups of first through holes are respectively slidably sleeved with the sliding rods (15). Springs (18) are respectively provided on the outer walls of the two groups of sliding rods (15). The fixed block (16) and the cross (14) are respectively slidably sleeved with the inner wall of the oil inlet pipe (4).

4. The hydraulic oil tank for a hydraulic station according to claim 3, characterized in that, The pressurizing component includes two groups of first support blocks (19), two groups of clamping rings (20) and a lid (21). A pressurizing pipe (22) is provided at the top end of the cover plate. The left end and the right end of the pressurizing pipe (22) are respectively connected to the first support blocks (19). The lid (21) is clamped to the pressurizing pipe (22). A sealing gasket (23) is provided at the inner end of the lid (21). Clamping blocks (24) are respectively provided at the left end and the right end of the lid (21). The two groups of first support blocks (19) are respectively hinged to the clamping rings (20). The two groups of clamping rings (20) are respectively clamped and fixed to the clamping blocks (24). A pressurizing head (25) is provided at the front end of the pressurizing pipe (22).

5. The hydraulic oil tank for a hydraulic station according to claim 4, characterized in that, The oil outlet assembly includes a second sleeve (26). A fourth thread is provided on the outer wall of the oil outlet pipe (5), and a fifth thread is provided at the inner end of the second sleeve (26). The fourth thread is threadedly connected to the fifth thread. A drain pipe (27) is provided on the second sleeve (26). A valve (28) is provided at the right end of the drain pipe (27), and the drain pipe (27) is inserted into the chamber (6).

6. The hydraulic oil tank for a hydraulic station according to claim 5, wherein, The secondary filtration assembly includes two sets of supports (29), a dust-proof filter net (30), and four sets of second screws (31). The left end and the right end of the chamber (6) are respectively connected to the supports (29). Two sets of fixing threaded holes are provided at the top of the two sets of supports (29). Four sets of fixing through holes are provided at the top of the dust-proof filter net (30). The four sets of second screws (31) are respectively threadedly connected to the fixing threaded holes through the fixing through holes.

7. A hydraulic oil tank for a hydraulic station according to claim 6, characterized in that, The detection assembly includes a float type water level detector (32) and a two-color alarm (33). A pressure gauge (38) is provided at the front end of the hydraulic oil tank (1). The pressure gauge (38) is sealingly inserted into the chamber (6). The float type water level detector (32) penetrates through the front end of the hydraulic oil tank (1) in a sealed manner. The top of the first cover plate (2) is connected to the two-color alarm (33). A control main board (34) is provided at the front end of the hydraulic oil tank (1).

8. A hydraulic oil tank for a hydraulic station according to claim 7, characterized in that, The reinforcement assembly includes sixteen sets of reinforcement bars (35), a second cover plate (36), and four sets of third screws (37). The top of the bottom plate (39) is connected to the sixteen sets of reinforcement bars (35). The inner ends of the sixteen sets of reinforcement bars (35) are in close contact with the hydraulic oil tank (1). A clamping groove is provided at the bottom end of the second cover plate (36). The clamping groove is clamped with the outer walls of the sixteen sets of reinforcement bars (35). Four sets of first through holes are provided at the top of the second cover plate (36). First threaded holes are respectively provided on the reinforcement bars (35) at the four corners. The four sets of third screws (37) are respectively threadedly connected to the first threaded holes through the first through holes.

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