阅读说明：本技术 一种在使用时可快速消泡的液压油箱 (Hydraulic oil tank capable of defoaming rapidly in use ) 是由 孙艳 刘伟善 刘尔方 徐逸诚 许海烽 于 2021-07-22 设计创作，主要内容包括：本发明公开了一种在使用时可快速消泡的液压油箱,包括箱体,所述箱体内设置有隔板,将所述箱体内腔分成两个腔体,分别是吸油腔和回油腔,所述吸油腔和回油腔和吸油腔内部分别设置有回油滤芯和吸油滤芯,所述吸油滤芯的出油口与吸油腔连通,所述吸油腔内部设置有防晃板,所述防晃板套在所述回油滤芯的表面,且防晃板可漂浮在回油腔内的油面上,此在使用时可快速消泡的液压油箱,首先将箱体的进油与出油之间的油路行程通过螺纹管加大,这样能够减少气泡的产生率；为了避免箱体在使用的过程中导致其油面波动的现象,在油面设置防晃板,通过防晃板能够对油面的波动起到一定抑制的作用,从而减少箱体使用过程中气泡产生的概率。(The invention discloses a hydraulic oil tank capable of defoaming rapidly in use, which comprises a tank body, wherein a partition plate is arranged in the tank body, an inner cavity of the tank body is divided into two cavities, namely an oil suction cavity and an oil return cavity, an oil return filter element and an oil suction filter element are respectively arranged in the oil suction cavity, the oil return cavity and the oil suction cavity, an oil outlet of the oil suction filter element is communicated with the oil suction cavity, an anti-shaking plate is arranged in the oil suction cavity, the anti-shaking plate is sleeved on the surface of the oil return filter element, and the anti-shaking plate can float on the oil surface in the oil return cavity; in order to avoid the phenomenon that the oil level of the tank body fluctuates in the using process, the anti-shaking plate is arranged on the oil level, the fluctuation of the oil level can be restrained to a certain extent through the anti-shaking plate, and therefore the probability of generating air bubbles in the using process of the tank body is reduced.)

1. The utility model provides a but hydraulic tank of quick defoaming when using, includes box (1), be provided with baffle (2) in box (1), will box (1) inner chamber falls into two cavitys, is respectively oil absorption chamber (3) and time oil return chamber (4), its characterized in that: an oil return filter element (41) and an oil absorption filter element (31) are respectively arranged in the oil return cavity (4) and the oil absorption cavity (3), and an oil outlet of the oil absorption filter element (31) is communicated with the outside;

an anti-shaking plate (5) is arranged in the oil return cavity (4), the anti-shaking plate (5) is sleeved on the surface of the oil return filter element (41), and the anti-shaking plate (5) floats on the oil surface in the oil return cavity (4);

the oil return device is characterized in that an oil box (6) is further arranged inside the oil return cavity (4), the oil inlet end of the oil box (6) is communicated with an oil inlet (65) formed in the box body (1), the oil outlet end of the oil box (6) is communicated with a plurality of groups of spiral pipes (7) surrounding the oil return filter element (41), and hydraulic oil inside the oil box (6) flows to the lower portion of the oil return cavity (4) through the spiral pipes (7).

2. A hydraulic oil tank capable of defoaming rapidly when in use according to claim 1, wherein: the top intercommunication of oil box (6) has defeated oil pipe (61), just be provided with thread circle (62) on defeated oil pipe (61), thread circle (62) threaded connection be in on the oil inlet of box (1), just the top of defeated oil pipe (61) is located the outside of box (1), defeated oil pipe (61) mouth of pipe department threaded connection has sealing plug (8).

3. A hydraulic oil tank capable of defoaming rapidly when in use according to claim 2, wherein: the oil box (6) is internally provided with oil conveying ports (63) with the same number as the spiral pipes (7), and the oil box (6) is communicated with the spiral pipes (7) through the oil conveying ports (63);

the bottom of oil return filter core (41) is fixed with annular plate (64), annular plate (64) are all passed to the bottom of spiral pipe (7), just the below that the department of producing oil of spiral pipe (7) is located annular plate (64).

4. A hydraulic oil tank capable of defoaming rapidly when in use according to claim 3, wherein: an oil pipe (42) communicated with the oil suction cavity (3) is arranged at the bottom of the oil return filter element (41);

a first mounting hole (21) is formed in the partition plate (2), an internal threaded pipe (22) is mounted in the first mounting hole (21), and an oil pipe (42) on the oil absorption filter element (31) is threaded on the internal threaded pipe (22).

5. A hydraulic oil tank capable of defoaming rapidly when in use according to claim 1, wherein: the center of the anti-shaking plate (5) is connected with a flexible corrugated pipe (51), the top of the flexible corrugated pipe (51) is provided with a fixed shell (54), the fixed shell (54) is arranged at the top end of the inner part of the oil return cavity (4), and the oil return filter element (41) is positioned in the flexible corrugated pipe (51);

and a plurality of groups of floating balls (52) are arranged at the bottom of the anti-shaking plate (5).

6. A hydraulic tank capable of defoaming rapidly when in use according to claim 6, wherein: a vertical plate (53) is arranged on the outer ring of the anti-shaking plate (5), and an area is formed between the vertical plate (53) and the flexible corrugated pipe (51).

7. A hydraulic oil tank capable of defoaming rapidly when in use according to claim 2, wherein: the oil tank is characterized in that a plugging piece (9) for opening and closing the oil delivery port (63) is arranged in the oil tank (6), the plugging piece (9) comprises a lifting cylinder (91) positioned in the oil tank (6), a lifting cylinder accommodating groove (93) for accommodating the lifting cylinder (91) to move up and down is formed in the bottom of the oil tank (6), a spring (92) is installed at the bottom of the lifting cylinder (91), the spring (92) at the bottom of the lifting cylinder (91) is fixed at the bottom of the lifting cylinder accommodating groove (93), a guide telescopic rod (921) is arranged in the spring (92), and the guide telescopic rod (921) is fixedly connected with the bottom of the lifting cylinder (91) and the lifting accommodating groove (93) respectively;

the sealing plug (8) is positioned at one end of the oil delivery pipe (61), the bearing is rotatably connected with a connecting rod (81), and a third piston sheet (82) is fixed at the bottom of the connecting rod (81) and is abutted against the lifting cylinder (91);

the top position of a lift section of thick bamboo (91) is fixed with link (96), link (96) are kept away from the one end of a lift section of thick bamboo (91) is fixed with fourth piston piece (97), just fourth piston piece (97) with oil delivery port (63) butt.

8. A hydraulic tank capable of defoaming rapidly when in use according to claim 7, wherein: a drainage cover (910) is installed on the outer surface of the lifting cylinder (91), a drainage seat (911) is arranged below the drainage cover (910), and the drainage seat (911) is installed inside the oil box (6).

9. A hydraulic oil tank capable of defoaming rapidly when in use according to claim 1, wherein: a flexible rubber ring (912) is arranged between the drainage cover (910) and the drainage seat (911).

10. A hydraulic oil tank capable of defoaming rapidly when in use according to claim 2, wherein: and a handle (10) is fixed on one side of the sealing plug (8) far away from the oil delivery pipe (61).

Technical Field

The invention relates to the technical field of hydraulic tank bodies, in particular to a hydraulic oil tank capable of quickly defoaming in use.

Background

The hydraulic technology has the advantages of high efficiency, flexible arrangement and the like, is widely applied to engineering machinery, is one of key technologies of the engineering machinery, and determines the performance of the engineering machinery. With the progress of modern science and technology, the development of hydraulic technology towards small volume, low cost, long service life, high automation degree, high reliability, high precision and the like becomes a necessary trend. Hydraulic systems typically include a pump, control valves, actuators, and a hydraulic tank. The hydraulic oil is sucked out of the hydraulic tank body through the pump, then passes through the control valve, reaches the executive component to realize the functional action of the machine, and finally flows back to the hydraulic tank body. Because the pressure and the flow rate change at each place of a hydraulic system circulation loop, a large amount of bubbles are mixed in the hydraulic system, particularly, the return oil has a large amount of visible bubbles, and the bubbles are quickly dispersed in the whole hydraulic box body. The bubbles with larger diameters can quickly float upwards and escape from the liquid level; most of the bubbles with smaller diameters are not floated and escape in time, and are sucked into the pump along with flowing oil liquid and enter the whole hydraulic system again. This is especially serious for the engineering machinery with frequent shaking and high-frequency vibration of the whole machine.

From the viewpoint of the working quality and the economical efficiency of the system, the damage of bubbles in oil to the whole hydraulic system is huge: 1. the system works badly, and fluid mixes the bubble, and the compressibility of fluid increases, causes automatic control error grow or malfunctioning, equipment intermittent motion. 2. The oil temperature rises, and because hydraulic pressure of hydraulic system is high or low and is constantly circulated, the bubble is by the rapid rise of compression temperature, and on the other hand, the heat conductivity greatly reduced of the fluid that mixes a large amount of bubbles seriously influences the cooling effect. Adverse effects due to the increase in oil temperature: the oxidation deterioration of the oil is accelerated, the lubricating performance of the oil is reduced, the aging of a sealing element is accelerated, and the occurrence of cavitation is increased. 3. Low efficiency and easy generation of vibration and noise.

The conventional coping means at present: the essential box body in the hydraulic system is utilized to remove bubbles, for example, the horizontal sectional area is larger than the depth of oil, one or more partition plates are arranged to prolong the retention time of the oil in the box body, the distance between an oil inlet and an oil outlet is far as possible, the volume of the oil tank is large as much as possible, and the like. But the bubble removal effect is still poor;

the main principle of increasing the residence time of the oil in the tank body is that the longer the bubbles stay in the tank body, the higher the possibility of collision between the bubbles is, and the bubbles can be broken, so that certain defoaming is performed on the inside of the oil tank;

in addition, another important factor of the bubbles generated in the hydraulic tank body is that the tank body can shake during the use of the hydraulic tank body, the oil level inside the tank body can swing along with the shaking of the tank body during the use, the liquid level fully contacts with air during the swinging process, the quantity of the bubbles generated in the liquid oil is increased, and therefore the hydraulic oil tank capable of defoaming rapidly during the use is provided.

Disclosure of Invention

The invention aims to provide a hydraulic oil tank capable of quickly defoaming in use so as to solve the problems in the prior art.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a hydraulic tank that can quick defoaming when using, includes the box, be provided with the baffle in the box, will the box inner chamber falls into two cavitys, is respectively to inhale oil chamber and time oil chamber, time oil chamber and the oil intracavity portion of inhaling are provided with oil return filter core and oil absorption filter core respectively, the oil-out and the outside intercommunication of oil absorption filter core, it is provided with and prevents shaking the board to return the intracavity portion, prevent shaking the board cover and be in the surface of oil return filter core, and prevent shaking the board and can float on the oil level of oil return intracavity, it still is provided with the oil box to return the intracavity portion, the oil inlet end of oil box with set up the oil inlet intercommunication on the box, the end intercommunication that goes out of oil box has the multiunit around spiral pipe around the oil return filter core, the inside hydraulic oil of oil box passes through spiral pipe flow direction and returns oil chamber lower part.

Preferably, the top of the oil box is communicated with an oil delivery pipe, a thread ring is arranged on the oil delivery pipe, the thread ring is in threaded connection with an oil inlet of the box body, the top of the oil delivery pipe is located on the outer side of the box body, and a sealing plug is in threaded connection with the opening of the oil delivery pipe.

Preferably, the inside of oil box seted up with the oil delivery mouth that spiral pipe quantity is the same, the oil box passes through the oil delivery mouth with the spiral pipe intercommunication, the bottom of oil return filter core is fixed with annular plate, the annular plate is all passed to the bottom of spiral pipe, just the department of producing oil of spiral pipe is located the below of annular plate.

Preferably, the bottom of the oil return filter element is provided with an oil pipe communicated with the oil suction cavity, the partition plate is provided with a first mounting hole, the first mounting hole is provided with an internal threaded pipe, and the oil pipe thread on the oil suction filter element is arranged on the internal threaded pipe.

Preferably, the center of the anti-shaking plate is connected with a flexible corrugated pipe, the top of the flexible corrugated pipe is provided with a fixed shell, the fixed shell is arranged at the top end of the inside of the oil return cavity, and the oil return filter element is positioned inside the flexible corrugated pipe;

and a plurality of groups of floating balls are arranged at the bottom of the anti-shaking plate.

Preferably, a vertical plate is arranged on the outer ring of the anti-shaking plate, and an area is formed between the vertical plate and the soft corrugated pipe.

Preferably, the inside of oil box is provided with the jam piece that opens and shuts the oil delivery mouth, the jam piece is including being located the lift section of thick bamboo in the oil box, the lift section of thick bamboo holding tank that holds a lift section of thick bamboo and reciprocate is seted up to oil box bottom, the spring is installed to the bottom of a lift section of thick bamboo, the spring of lift section of thick bamboo bottom is fixed in lift section of thick bamboo holding tank bottom, be provided with the direction telescopic link in the spring, the direction telescopic link respectively with lift section of thick bamboo bottom and lift holding tank fixed connection.

The sealing plug is positioned at one end of the oil delivery pipe, the bearing is rotatably connected with a connecting rod, and a third piston sheet is fixed at the bottom of the connecting rod and is abutted against the lifting cylinder;

the top position of a lifting cylinder is fixed with a connecting frame, one end of the connecting frame, which is far away from the lifting cylinder, is fixed with a fourth piston sheet, and the fourth piston sheet is abutted to the oil delivery port.

Preferably, the outer surface of the lifting cylinder is provided with a drainage cover, a drainage seat is arranged below the drainage cover, and the drainage seat is arranged in the oil box.

Preferably, a flexible rubber ring is arranged between the drainage cover and the drainage seat.

Preferably, a handle is fixed on one side of the sealing plug away from the oil pipeline.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the invention, firstly, the stroke of an oil path between oil inlet and oil outlet of the box body is enlarged through the threaded pipe, so that the generation rate of bubbles can be reduced; in order to avoid the phenomenon that the oil level of the tank body fluctuates in the using process, the anti-shaking plate is arranged on the oil level, the fluctuation of the oil level can be restrained to a certain extent through the anti-shaking plate, and therefore the probability of generating air bubbles in the using process of the tank body is reduced.

2. According to the oil suction filter, the oil delivery pipe, the oil suction filter element and the oil box are arranged into a whole, so that the oil suction filter element is arranged on the box body through the threaded ring, and the oil suction filter element is convenient to detach and install.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the overall front view structure of the present invention;

FIG. 3 is a schematic view of the internal structure of the case according to the present invention;

FIG. 4 is a schematic view of the internal structure of the case in another orientation;

FIG. 5 is a schematic view of the interior of the case;

FIG. 6 is a partial sectional view of the anti-sloshing plate according to the present invention;

FIG. 7 is a schematic view of a partial cross-sectional structure of an oil cartridge according to the present invention;

FIG. 8 is a partial main sectional structural schematic view of an oil cartridge of the present invention;

FIG. 9 is a schematic cross-sectional view of a plug according to the present invention;

FIG. 10 is a schematic view of another angular cross-section of the oil box;

FIG. 11 is a schematic sectional view of the case of the present invention

FIG. 12 is a schematic cross-sectional view of another aspect of the case of the present invention.

In the figure: 1-a box body; 2-a separator; 21-a first mounting hole; 22-a threaded pipe; 3-oil suction cavity; 31-an oil absorbent filter element; 4-an oil return cavity; 41-oil return filter element; 42-tubing; 5-anti-shaking plates; 51-flexible bellows; 52-floating ball; 53-a riser; 54-a stationary shell; 6-oil box; 61-an oil delivery pipe; 62-thread ring; 63-oil conveying port; 64-annular plates; 65-an oil inlet 7-a spiral pipe; 8-sealing plug; 81-connecting rod; 82-a third piston disc; 9-a stopper; 91-a lifting cylinder; 910-a drainage mask; 911-drainage seat; 912-flexible rubber ring; 92-a spring; 921-guiding the telescopic rod; 93-a lifting cylinder accommodating groove; 96-a connecting frame; 97-a fourth piston disc; 10-handle.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-12, the present invention provides a technical solution: a hydraulic oil tank capable of defoaming rapidly in use comprises a tank body 1, wherein a partition plate 2 is arranged in the tank body 1, an inner cavity of the tank body 1 is divided into two cavities, namely an oil suction cavity 3 and an oil return cavity 4, an oil return filter element 41 and an oil suction filter element 31 are respectively arranged in the oil return cavity 4 and the oil suction cavity 3, and an oil outlet of the oil suction filter element 31 is communicated with the outside;

the hydraulic oil inside the return tank 1 is filtered by the return filter element 41, and the filtered hydraulic oil is sucked into the oil suction chamber 3 through the oil suction filter element 31.

An anti-shaking plate 5 is arranged in the oil return cavity 4, the anti-shaking plate 5 is sleeved on the surface of the oil return filter element 41, and the anti-shaking plate 5 floats on the oil surface in the oil return cavity 4;

the anti-shaking plate 5 is made of a material with large buoyancy, such as a rubber body or a foam plate, and can also be of a hollow plate structure, the edge of the anti-shaking plate 5 and the inner cavity surface of the oil return cavity 4 are arranged in a sliding mode, and when the hydraulic oil level fluctuates, the fluctuation of the oil level is restrained due to the existence of the anti-shaking plate 5.

The oil return cavity 4 is internally provided with an oil box 6, the oil inlet end of the oil box 6 is communicated with an oil inlet arranged on the box body 1, the oil outlet end of the oil box 6 is communicated with a plurality of groups of spiral pipes 7 surrounding the oil return filter element 41, and hydraulic oil in the oil box 6 flows to the lower part of the oil return cavity 4 through the spiral pipes 7.

At first hydraulic oil enters into spiral pipe 7 through oil box 6 inside, and the final inside bottommost that flows to oil return chamber 4 not only can improve the stroke of hydraulic oil like this, can reduce hydraulic oil moreover and the area of air contact when pouring into box 1, further prevents that the bubble from producing, and simultaneously, when some small bubbles flow in spiral pipe 7, strike each other and form the big bubble, when flowing out from spiral pipe 7, are filtered by oil return filter core 41 more easily.

The top of the oil box 6 is communicated with an oil delivery pipe 61, a thread ring 62 is arranged on the oil delivery pipe 61, the thread ring 62 is connected to an oil inlet of the box body 1 in a threaded mode, the top of the oil delivery pipe 61 is located on the outer side of the box body 1, and a sealing plug 8 is connected to the pipe opening of the oil delivery pipe 61 in a threaded mode.

The sealing plug 8 is arranged to facilitate the injection of hydraulic oil into the tank 1.

The oil box 6 is internally provided with oil conveying ports 63 with the same number as the spiral pipes 7, and the oil box 6 is communicated with the spiral pipes 7 through the oil conveying ports 63;

the bottom of oil return filter core 41 is fixed with annular plate 64, annular plate 64 is all passed to the bottom of spiral pipe 7, just the department of producing oil of spiral pipe 7 is located the below of annular plate 64.

The annular plate 64 mainly supports the spiral tube 7.

An oil pipe 42 communicated with the oil suction cavity 3 is arranged at the bottom of the oil return filter element 41;

the partition plate 2 is provided with a first mounting hole 21, the first mounting hole 21 is provided with an internal threaded pipe 22, and the oil pipe 42 on the oil absorption filter element 31 is threaded on the internal threaded pipe 22.

The hydraulic oil in the return oil chamber first passes through the inside of the return oil filter element 41 and enters the inside of the suction chamber 3, thus further filtering the hydraulic oil.

The center of the anti-shaking plate 5 is connected with a flexible corrugated pipe 51, the top of the flexible corrugated pipe 51 is provided with a fixed shell 54, the fixed shell 54 is arranged at the top end inside the oil return cavity 4, and the oil return filter element 41 is positioned inside the flexible corrugated pipe 51;

the bottom of the anti-sloshing plate 5 is provided with a plurality of groups of floating balls 52.

The effect of floater 52 is to improve the buoyancy of anti-sway board 5 to in order to guarantee that the central point of anti-sway board 5 can not appear that the oil level is higher than anti-sway board 5, will prevent to set up the flexible bellows that can contract between board 5 and the oil return filter core 41, this flexible bellows can fold under the effect of buoyancy, and the gravity of anti-sway board 5 is back to the extension, can guarantee like this that anti-sway board 5 is located the oil level all the time.

The outer ring of the anti-shaking plate 5 is provided with a vertical plate 53, an area is formed between the vertical plate 53 and the flexible corrugated pipe 51, the area is mainly a square column area enclosed by the anti-shaking plate 5 and the upturned vertical plate 53, the buoyancy of the anti-shaking plate 5 is mainly improved, and oil is prevented from entering the upper part of the anti-shaking plate 5.

Because the anti-shaking plate 5 is in sliding connection with the inner wall of the oil return cavity, when the oil level fluctuates, part of hydraulic oil flows to the top of the anti-shaking plate 5 from a gap between the anti-shaking plate 5 and the inner wall of the oil return cavity 4, if the amount is large, the gravity of the whole anti-shaking plate 5 is larger than the buoyancy of the whole anti-shaking plate 5 on the hydraulic oil level, so that the anti-shaking plate sinks, in order to avoid the phenomenon, the vertical plate 53 is arranged at the edge of the anti-shaking plate 5, a cavity is formed between the vertical plate 53 and the flexible corrugated pipe, and the cavity has a certain separation effect.

The inside of oil box 6 is provided with the jam piece 9 that opens and shuts to oil delivery mouth 63, jam piece 9 is including being located the lift section of thick bamboo 91 of oil box 6, the lift section of thick bamboo holding tank 93 that holds lift section of thick bamboo 91 and reciprocate is seted up to oil box 6 bottom, spring 92 is installed to the bottom of lift section of thick bamboo 91, the spring 92 of lift section of thick bamboo 91 bottom is fixed in lift section of thick bamboo holding tank 93 bottom, be provided with direction telescopic link 921 in the spring 92, direction telescopic link 921 respectively with lift section of thick bamboo 91 bottom and lift holding tank 93 fixed connection.

The sealing plug 8 is positioned at one end of the oil delivery pipe 61, the bearing is rotatably connected with a connecting rod 81, and a third piston sheet 82 is fixed at the bottom of the connecting rod 81 and is abutted against the lifting cylinder 91;

the top position of a lift section of thick bamboo 91 is fixed with link 96, the link 96 is kept away from the one end of a lift section of thick bamboo 91 is fixed with fourth piston piece 97, just fourth piston piece 97 with oil delivery port 63 butt, link 96 includes a plurality of branches, and every branch cooperates one by one with a plurality of oil delivery ports 63.

The outer surface of the lifting cylinder 91 is provided with a drainage cover 910, a drainage seat 911 is arranged below the drainage cover 910, and the drainage seat 911 is arranged inside the oil box 6.

After hydraulic oil input finishes, fill in the mouth of pipe department of defeated oil pipe 61 with sealing plug 8, in order to guarantee that external air enters into the inside of spiral pipe 7, close defeated oil mouth 63 through blocking member 9, external air can only be located the inside of oil box 6 like this, can't enter into the inside of spiral pipe 7, has guaranteed the inside air content of spiral pipe 7.

A flexible rubber ring 912 is arranged between the drainage cover 910 and the drainage seat 911.

A handle 10 is fixed on one side of the sealing plug 8 far away from the oil pipeline 61.

When the oil return filter element 41 needs to be disassembled, the end part of the oil delivery pipe 61 positioned on the outer side of the box body 1 is rotated, because the thread ring 62 and the oil pipe 42 are integrally arranged, the oil delivery pipe 61 rotates to drive the thread ring 62 to rotate, the oil pipe 42 at the bottom of the oil return filter element 41 is driven to rotate while the thread ring 62 rotates, and when the thread ring 62 is separated from the box body 1, the oil pipe 42 is separated from the thread pipe 22, so that the disassembly of the oil return filter element 41 is realized.

The principle of how the blocking member 9 seals the oil delivery port 63 is further described, first, the spring 92 is in a normal state, at this time, hydraulic oil sequentially flows from the top of the lifting cylinder 91 to the drainage cover 910 and the drainage seat 911, and finally, the hydraulic oil is drained to the position of the liquid outlet, after oil injection is finished, the piston with the connecting rod 81 is inserted into the oil box 6, at this time, the third piston plate 82 at the end of the connecting rod 81 is in contact with the lifting cylinder 91, in the process of rotating the sealing plug 8, the third piston plate 82 presses the lifting cylinder 91, at this time, the lifting cylinder 91 moves downward under the action of the connecting rod 81, the lifting cylinder 91 moves downward to drive the fourth piston plate 97 at the end of the connecting frame 96 to move, and finally, the oil delivery port 63 is sealed to a certain extent through the pressing of the fourth piston plate 97;

the oil amount injected into the tank 1 is described, that is, the hydraulic oil level is lower than the bottom surface of the oil box 6;

in addition, because the end of the connecting rod 81 is connected to the top of the oil delivery pipe 61 by a screw, the connecting rod can limit the spring 92 to prevent the spring 92 from returning, when the sealing plug 8 is taken out from the pipe orifice of the oil delivery pipe 61, the connecting rod 81 is separated from the lifting cylinder 91, the lifting cylinder 81 returns under the action of the spring 92, and at this time, the fourth piston sheet 97 is separated from the oil delivery port 63.

As to why the blocking member 9 is required to seal the oil delivery port 63, there is also a reason that, in a normal habit, after the hydraulic oil tank is used to a certain extent, the inside of the oil tank needs to be subjected to an oil change process, and in the oil change process, in order to ensure that outside air does not enter the spiral pipe 7, the blocking member 9 is used to seal the inside of the oil tank.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.