Oil tank lock cover, oil tank and operation machine

Abstract

The utility model relates to the technical field of oil tank lock covers, and discloses an oil tank lock cover, an oil tank and an operation machine. The oil tank lock cover comprises a lock cover body, the mounting base is connected with the interior of the lock cover body in a matched mode, and a mounting through hole is formed in the mounting base; the valve nail is movably mounted in the mounting through hole and has an opening state and a sealing state, and in the opening state, a gap is reserved between the valve nail and the mounting through hole, and an air inlet channel is formed between the mounting seat and the lock cover body; in a sealing state, the valve nail blocks the mounting through hole, and an exhaust channel is formed between the mounting base and the lock cover body. The air inlet channel and the exhaust channel are arranged between the mounting seat and the lock cover body, so that the air pressure in the oil tank can be effectively adjusted, and the conditions that the oil tank is shrunken and deformed due to suction and fuel oil leaks are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of oil tank lock covers, in particular to an oil tank lock cover, an oil tank and an operating machine. Background Art

[0002] At present, most fuel tank lock covers are usually normally open and normally closed. Among them, the normally open lock cover can maintain the pressure between the fuel tank and the outside world, but when the fuel tank is tilted, it cannot prevent fuel leakage; the normally closed lock cover may cause excessive negative pressure in the fuel tank, causing the fuel tank to collapse, affecting subsequent normal use. Utility Model Content

[0003] In view of this, the utility model provides a fuel tank lock cover, a fuel tank and an operating machine to solve the problem that the existing fuel tank lock cover cannot have the function of balancing the internal pressure of the fuel tank and preventing fuel from leaking from the fuel tank filling port.

[0004] In a first aspect, the utility model provides a fuel tank lock cover, comprising:

[0005] Lock cover body;

[0006] A mounting seat, which is connected with the lock cover body in cooperation, and the mounting seat is provided with a mounting through hole;

[0007] The valve pin is movably installed in the mounting through hole and has an open state and a sealed state. In the open state, a gap is left between the valve pin and the mounting through hole and an air intake channel is formed between the mounting seat and the lock cover body; in the sealed state, the valve pin blocks the mounting through hole and an exhaust channel is formed between the mounting seat and the lock cover body.

[0008] Beneficial effect: The utility model changes the position of the valve pin in the installation through hole, so that the installation seat and the lock cover body can form an intake channel in the open state and an exhaust channel in the sealed state. In this way, whether the fuel tank is in a normal oil delivery state or in a tilted state, the pressure in the fuel tank can be effectively adjusted, and the fuel can be prevented from leaking from the fuel tank filling port, thereby ensuring the safety of the fuel tank and related equipment.

[0009] In an optional embodiment, an oil-blocking structure is provided in the mounting through hole, the oil-blocking structure includes an oil-blocking ring, the valve nail has a nail head and a nail column, the nail column passes through the oil-blocking ring and leaves a gap between the nail head and the oil-blocking ring, and in the open state, a gap is left between the nail head and the oil-blocking ring and the oil-blocking structure is connected to the air intake channel.

[0010] Beneficial effect: The utility model can prevent the fuel in the fuel tank from entering the external environment through the installation through hole by setting the oil blocking ring. Furthermore, a gap is left between the nail column and the oil blocking ring, so that a channel suitable for air circulation can be formed on the oil blocking ring, thereby ensuring that the external air can smoothly enter the fuel tank through the air intake channel, and preventing the fuel tank from being sucked out due to low pressure.

[0011] In an optional embodiment, the oil-blocking structure also includes a sleeve extending axially from the outer peripheral surface of the oil-blocking ring along the oil-blocking ring, and a limit cover is provided on the mounting through hole, and the limit cover includes a cover body and an annular cover body extending toward the mounting through hole, and the cover body is provided with an air vent connected to the mounting through hole and the oil-blocking structure, and a limit space is enclosed between the annular cover body and the inner side wall of the mounting through hole, and the sleeve is located in the limit space; in the sealed state, the nail head abuts against the oil-blocking ring and seals the connection between the nail column and the oil-blocking ring, and the gap between the sleeve and the inner side wall of the mounting through hole is connected to the exhaust channel.

[0012] Beneficial effect: The utility model sets the sleeve in the limited space, which can, on the one hand, limit the position of the sleeve to avoid a large gap between the sleeve and the inner wall of the mounting through hole, affecting the sleeve's blocking effect on the fuel; on the other hand, it can increase the complexity of the fuel flow path while ensuring that the air in the fuel tank is smoothly discharged from the fuel tank, reduce the possibility of fuel flowing out from between the sleeve and the annular cover body, and thus reduce the risk of leakage when the fuel tank is tilted.

[0013] In an optional embodiment, a first spring and a second spring are provided inside and outside the limit cover and the oil-blocking structure, the first spring connects the nail head and the oil-blocking structure, and the second spring connects the limit cover and the oil-blocking structure.

[0014] Beneficial effects: The utility model connects the two ends of the first spring to the nail head and the oil-blocking structure respectively, which can limit the range of motion of the valve nail and improve the stability of the structure on the one hand; on the other hand, when the pressure of the external environment is equal to the internal pressure of the fuel tank, the first spring can be used to make the nail head and the oil-blocking structure in abutment state, thereby preventing the fuel in the fuel tank from flowing into the external environment through the connection between the nail column and the oil-blocking structure, thereby improving the convenience of fuel tank transportation. In addition, by arranging a second spring between the limit cover and the oil-blocking structure, the pressure generated when the fuel tank is tilted can be prevented from affecting the structure of the oil-blocking structure itself, ensuring that the oil-blocking structure can fully exert its own function.

[0015] In an optional embodiment, the mounting through hole is a stepped hole that is larger at the top and smaller at the bottom, and the oil-blocking structure is arranged in the large end of the stepped hole; the small end of the stepped hole is a countersunk hole that is larger at the top and smaller at the bottom, and a plurality of limiting protrusions are arranged at intervals on the bottom wall of the large end of the countersunk hole; in the open state, a gap is left between the nail head and the large end of the countersunk hole and is suitable for abutting against the limiting protrusion.

[0016] Beneficial effects: The utility model sets the oil-blocking structure in the large end of the stepped hole, which makes it easier to set the oil-blocking ring of the oil-blocking structure in the installation through hole, thereby reducing the difficulty of assembly. Furthermore, setting the small end of the stepped hole as a countersink not only reduces the aperture of the stepped hole, but also forms two step surfaces in the installation through hole, thereby increasing the difficulty of fuel from the inside of the fuel tank to the external environment. In addition, a limiting protrusion is set on the bottom wall of the large end of the countersink, which can ensure that there is a gap between the nail head and the bottom wall of the large end of the countersink, ensuring the smoothness of air in the intake passage.

[0017] In an optional embodiment, a rubber pad is provided between the oil-blocking structure and the nail head, and a first annular protrusion and a second annular protrusion surrounding the first annular protrusion are provided on the side of the small end of the rubber pad facing the stepped hole, the first annular protrusion is suitable for abutting against the nail head, and the second annular protrusion is suitable for abutting against the bottom wall of the large end of the stepped hole.

[0018] Beneficial effects: The utility model can provide a certain buffering effect for the oil-blocking structure by providing a rubber pad between the oil-blocking structure and the nail head, thereby reducing the probability that the oil-blocking structure is damaged by the oil pressure generated when the oil tank is tilted. In addition, a first annular protrusion is provided on the side of the small end of the rubber pad facing the stepped hole, which can overcome the influence of manufacturing errors and ensure that the nail head can completely seal the sealing part between the nail column and the oil-blocking ring. Similarly, by providing a second annular protrusion, it can be ensured that the rubber pad fits tightly against the bottom wall of the large end of the stepped hole.

[0019] In an optional embodiment, in the open state, the air vent, the oil-blocking structure and the countersunk hole are connected in sequence to form the air intake passage; in the sealed state, the countersunk hole, the gap between the oil-blocking structure and the stepped hole and the air vent are connected in sequence to form the exhaust passage.

[0020] Beneficial effects: The utility model can continuously deliver external air to the inside of the oil tank by sequentially connecting the vent hole, the oil-blocking structure and the countersunk hole to form an air intake passage, thereby avoiding a large negative pressure inside the oil tank during use. In addition, by sequentially connecting the countersunk hole, the gap between the oil-blocking structure and the stepped hole and the vent hole to form an exhaust passage, the air in the oil tank in a tilted state can be discharged smoothly, so that the pressure difference between the oil tank and the outside pressure gradually approaches zero.

[0021] In an optional implementation, a pressure sensor is provided on the side of the nail head facing away from the oil-blocking structure.

[0022] Beneficial effect: The utility model provides a pressure sensor on the side of the nail head away from the oil-blocking structure, which is convenient for detecting the pressure condition in the oil tank and transmitting the acquired pressure information to the control system, thereby changing the working state of the operating machinery.

[0023] In a second aspect, the utility model provides a fuel tank, comprising:

[0024] The fuel tank body is provided with a fuel filling port, and the inner wall of the fuel filling port is provided with an internal thread;

[0025] The above-mentioned fuel tank lock cover, the mounting seat is provided with an external thread suitable for engaging with the internal thread.

[0026] Beneficial effect: The utility model adopts the above-mentioned fuel tank lock cover to connect with the fuel tank body, which can not only make the fuel tank always connected with the external environment during normal use to ensure that there will be no large negative pressure inside it, but also can relieve the pressure of the fuel tank in a tilted state, that is, to transport the excess air inside the fuel tank to the external environment through the exhaust channel, thereby reducing the possibility of fuel leakage.

[0027] In a third aspect, the utility model further provides an operating machine, comprising:

[0028] Frame body;

[0029] The above-mentioned oil tank is arranged on the frame body.

[0030] Beneficial effect: By adopting the above-mentioned fuel tank, the utility model can, on the one hand, improve the continuity of the construction operation of the operating machinery and avoid the situation where normal construction cannot be carried out due to the internal pressure of the fuel tank being too low; on the other hand, it can prevent fuel leakage from the fuel tank when the operating machinery is tilted, thereby reducing the probability of safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 This is a structural schematic diagram of a fuel tank lock cover according to an embodiment of the utility model;

[0033] Figure 2 for Figure 1 A top view of the fuel tank locking cover is shown;

[0034] Figure 3 for Figure 1 Axial section view of the fuel tank lock cover;

[0035] Figure 4 It is an axial cross-sectional view of the mounting seat and the limiting cover of the embodiment of the utility model.

[0036] Description of reference numerals:

[0037] 1. Lock cover body; 2. Mounting seat; 201. Mounting through hole; 2011. Step hole; 2012. Countersunk hole; 20121. Limiting protrusion; 202. Oil blocking structure; 2021. Oil blocking ring; 2022. Sleeve; 203. Limiting cover; 2031. Cover body; 20311. Vent hole; 2032. Annular cover body; 3. Valve pin; 301. Pin head; 302. Pin column; 4. First spring; 5. Second spring; 6. Rubber pad; 601. First annular protrusion; 602. Second annular protrusion. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0039] Aiming at the problem that the existing fuel tank lock cover cannot have the function of balancing the pressure inside the fuel tank and preventing the fuel from leaking from the fuel tank filling port, the utility model provides a fuel tank lock cover, a fuel tank and an operating machine.

[0040] Combine the following Figures 1 to 4 , describing an embodiment of the utility model.

[0041] According to an embodiment of the utility model, on the one hand, a working machine is provided. Generally, a working machine generally has a frame body and a fuel tank arranged on the frame body. The fuel tank includes a fuel tank body, and the main function of the fuel tank body is to store fuel, and at the same time cooperate with other related pipelines and equipment to transport the fuel to the combustion chamber of the engine for combustion, thereby providing a power source for the normal operation of the working machine.

[0042] It should be noted that the operating machine in this embodiment may be, but is not limited to, an excavator, a bulldozer, a crane or other operating machine.

[0043] However, during normal use of the fuel tank, as the amount of fuel in the tank decreases, the pressure in the tank will gradually decrease. Therefore, the tank may be deflated under the influence of the external atmospheric pressure, causing the machine to fail to operate normally. In addition, since the working environment of the machine is usually harsh, the tank may tilt excessively with the posture of the frame during the operation of the machine, causing fuel leakage in the tank.

[0044] In order to overcome the above problems, according to the embodiments of the present utility model, on the other hand, Figures 1 to 4 As shown, a fuel tank lock cover is provided, comprising a lock cover body 1, a valve pin 3 and a mounting seat 2 threadedly connected to the fuel filling port of the fuel tank body.

[0045] Specifically, the mounting seat 2 is connected with the lock cover body 1, and the mounting seat 2 is provided with a mounting through hole 201; the valve pin 3 can be movably installed in the mounting through hole 201, and has an open state and a sealed state. In the open state, a gap is left between the valve pin 3 and the mounting through hole 201, and an air intake channel is formed between the mounting seat 2 and the lock cover body 1; in the sealed state, the valve pin 3 blocks the mounting through hole 201, and an exhaust channel is formed between the mounting seat 2 and the lock cover body 1. It should be noted that when the fuel tank body is not tilted, the valve pin 3 is in an open state, that is, the external environment can transport the external air to the inside of the fuel tank body through the air intake channel, thereby reducing the pressure difference between the inside of the fuel tank body and the external environment, so that the operating machine can work safely. When the fuel tank body is over-tilted, the valve pin 3 will automatically switch to a closed state, that is, the fuel tank body can discharge the air inside it to the external environment through the exhaust channel, so that the pressure value inside the fuel tank body gradually approaches the pressure value in the external environment, thereby reducing the possibility of fuel leakage in the fuel tank body. In this way, no matter whether the fuel tank body is in a normal oil delivery state (not tilted) or in an excessively tilted state, the fuel tank lock cover in this embodiment can effectively regulate the pressure in the fuel tank body and prevent fuel from leaking from the fuel tank filling port, thereby ensuring the safety of the fuel tank and related equipment.

[0046] In a specific embodiment, Figure 3 and Figure 4As shown, an annular plate is provided at one end of the mounting seat 2, an open groove is provided on the annular plate, an annular boss is provided in the middle area of ​​the bottom wall of the open groove, and a mounting through hole 201 extending along the height direction of the mounting seat 2 is provided in the annular boss. It should be noted that the mounting seat 2 in this embodiment is connected to the lock cover body 1 by snapping through the annular plate, and a gap is left between the upper end surface of the mounting seat 2 and the lock cover body 1. Therefore, in order to ensure that the air intake channel and the exhaust channel can be connected to the external environment, at least one through hole connected to the air intake channel and the exhaust channel can be provided on the upper end surface or side wall of the lock cover body 1; at least one groove suitable for air circulation and connected to the air intake channel and the exhaust channel can also be provided on the side where the annular plate and the lock cover body 1 abut each other.

[0047] For example, three grooves are arranged at intervals on the side where the annular plate abuts against the lock cover body 1. It is understandable that when the fuel tank lock cover and the fuel tank body are in a connected state, a certain gap is left between the side wall of the lock cover body 1 and the outer side wall of the fuel tank body, so that the fuel tank lock cover can be connected to the external environment while the side wall of the lock cover body 1 can be used to prevent particles from entering the fuel tank body.

[0048] According to one embodiment of the utility model, Figure 3 and Figure 4 As shown, an oil-blocking structure 202 is provided in the installation through hole 201, and the oil-blocking structure 202 includes an oil-blocking ring 2021. The valve nail 3 has a nail head 301 and a nail column 302. The nail column 302 passes through the oil-blocking ring 2021 and leaves a gap with the oil-blocking ring 2021. In the open state, a gap is left between the nail head 301 and the oil-blocking ring 2021, and the oil-blocking structure 202 is connected to the air intake passage. By providing the oil-blocking ring 2021, it is possible to prevent the fuel in the fuel tank from entering the external environment through the installation through hole 201. Furthermore, a gap is left between the nail column 302 and the oil-blocking ring 2021, so that a channel suitable for air circulation can be formed on the oil-blocking ring 2021, thereby ensuring that the external air can smoothly enter the interior of the fuel tank through the air intake passage, and avoiding the internal part of the fuel tank from being sucked in due to low pressure.

[0049] Furthermore, if Figure 3 and Figure 4As shown, the oil-blocking structure 202 also includes a sleeve 2022 extending axially from the outer peripheral surface of the oil-blocking ring 2021 along the oil-blocking ring 2021, and a limit cover 203 is provided on the mounting through hole 201. The limit cover 203 includes a cover body 2031 and an annular cover body 2032 extending toward the mounting through hole 201, and the cover body 2031 is provided with an air vent 20311 connected to the mounting through hole 201 and the oil-blocking structure 202. A limit space is formed between the annular cover body 2032 and the inner side wall of the mounting through hole 201, and the sleeve 2022 is located in the limit space; in a sealed state, the nail head 301 abuts against the oil-blocking ring 2021 and seals the connection between the nail column 302 and the oil-blocking ring 2021, and the gap between the sleeve 2022 and the inner side wall of the mounting through hole 201 is connected to the exhaust channel. By setting the sleeve 2022 in the limited space, on the one hand, the position of the sleeve 2022 can be limited to avoid a large gap between the sleeve 2022 and the inner wall of the mounting through hole 201, which would affect the blocking effect of the sleeve 2022 on the fuel; on the other hand, while ensuring that the air in the fuel tank is smoothly discharged from the fuel tank, the complexity of the fuel flow path is increased, and the possibility of fuel flowing out from between the sleeve and the annular cover body is reduced, thereby reducing the risk of leakage when the fuel tank is tilted.

[0050] It should be noted that, in this embodiment, the open state and the sealed state of the valve pin 3 can be automatically switched according to the posture of the oil tank. The following will be explained in combination with specific circumstances:

[0051] When the fuel tank is suddenly tilted excessively, the fuel in the fuel tank will flow back, that is, flow from the inside of the fuel tank body to the direction of the fuel tank lock cover. When the fuel contacts the nail head 301 through the installation hole 201, the nail head 301 will move in the direction of the oil blocking ring 2021 until the connection between the sealing nail column 302 and the oil blocking ring 2021. Then the air and fuel in the fuel tank will flow along the gap between the sleeve 2022 and the inner wall of the installation hole 201. However, due to the relatively complex flow path formed between the limit cover 203, the sleeve 2022 and the inner wall of the installation hole 201, the fuel tank cannot directly leak into the external environment. Similarly, when the fuel tank returns to its normal posture, under the action of the self-gravity of the valve nail 3 and the external atmosphere, the air intake channel will be reopened, and the exhaust channel will be closed again.

[0052] It should be supplemented that the material of the oil-blocking structure 202 in the present embodiment may be nitrile rubber, as long as it has good oil resistance, and the present invention does not make any specific limitation on this.

[0053] According to one embodiment of the utility model, Figure 3As shown, a first spring 4 and a second spring 5 are provided between the limit cover 203 and the oil-blocking structure 202, and the first spring 4 and the second spring 5 are both provided with a nail head 301, the first spring 4 connects the nail head 301 and the oil-blocking structure 202, and the second spring 5 connects the limit cover 203 and the oil-blocking structure 202. By connecting the nail head 301 and the oil-blocking structure 202 at both ends of the first spring 4, on the one hand, the range of motion of the valve nail 3 can be limited, and the stability of the structure can be improved; on the other hand, when the pressure of the external environment is equal to the internal pressure of the fuel tank, the first spring 4 can be used to make the nail head 301 and the oil-blocking structure 202 in abutment state, thereby preventing the fuel in the fuel tank from flowing into the external environment through the connection between the nail column 302 and the oil-blocking structure 202, and improving the convenience of fuel tank transportation. In addition, by arranging the second spring 5 between the limit cover 203 and the oil-blocking structure 202, the pressure generated when the fuel tank is tilted can be prevented from affecting the structure of the oil-blocking structure 202, ensuring that the oil-blocking structure 202 can fully play its own function.

[0054] It is understandable that the specifications (ie, the magnitude of the elastic force) of the first spring 4 and the second spring 5 between the limiting cover 203 and the oil blocking structure 202 can be adjusted accordingly according to the size of the oil tank.

[0055] According to one embodiment of the utility model, Figure 3 and Figure 4 As shown, the installation through hole 201 is a stepped hole 2011 with a large top and a small bottom, and the oil blocking structure 202 is arranged in the large end of the stepped hole 2011. In this way, it is convenient to arrange the oil blocking ring 2021 of the oil blocking structure 202 in the installation through hole 201, reducing the difficulty of assembly. Further, the small end of the stepped hole 2011 is set as a countersunk hole 2012 with a large top and a small bottom, and a gap is left between the nail head 301 and the large end of the countersunk hole 2012, and a plurality of limiting protrusions 20121 are arranged on the bottom wall of the large end of the countersunk hole 2012 at intervals. In this way, when the valve nail 3 is in the open state, the nail head 301 can abut against the limiting protrusion 20121, so as to ensure that there is a gap between the nail head 301 and the bottom wall of the large end of the countersunk hole 2012, thereby improving the fluidity of air in the air intake passage. In addition, setting the small end of the stepped hole 2011 as a countersunk hole 2012 can not only reduce the aperture of the stepped hole 2011, but also form two step surfaces in the installation through hole 201, thereby increasing the difficulty of fuel flowing from the inside of the fuel tank to the external environment.

[0056] According to one embodiment of the utility model, Figure 3 and Figure 4As shown, a rubber pad 6 is provided between the oil-blocking structure 202 and the nail head 301, which can play a certain buffering role for the oil-blocking structure 202 and reduce the probability that the oil-blocking structure 202 is damaged by the oil pressure generated when the oil tank is tilted. Furthermore, a first annular protrusion 601 and a second annular protrusion 602 surrounding the first annular protrusion 601 are provided on the side of the small end of the rubber pad 6 facing the stepped hole 2011. The first annular protrusion 601 is suitable for abutting against the nail head 301, and the second annular protrusion 602 is suitable for abutting against the bottom wall of the large end of the stepped hole 2011, which can overcome the influence of production and manufacturing errors and ensure that the nail head 301 can completely seal the sealing part between the nail column 302 and the oil-blocking ring 2021. Similarly, by providing the second annular protrusion 602, it can be ensured that the rubber pad 6 is tightly fitted with the bottom wall of the large end of the stepped hole 2011.

[0057] According to an embodiment of the utility model, in the open state, the vent hole 20311, the oil-blocking structure 202 and the counterbore 2012 are connected in sequence to form an air intake passage, which can continuously deliver external air to the inside of the oil tank, thereby preventing the oil tank from generating a large negative pressure inside during use. In the sealed state, the counterbore 2012, the gap between the oil-blocking structure 202 and the stepped hole 2011 and the vent hole 20311 are connected in sequence to form an exhaust passage, which can smoothly discharge the air in the oil tank in a tilted state, thereby gradually making the pressure difference between the oil tank and the outside pressure approach zero.

[0058] According to an embodiment of the present invention, a pressure sensor is provided on the side of the nail head 301 away from the oil-blocking structure 202, which can detect the pressure in the oil tank and transmit the acquired pressure information to the control system, thereby changing the working state of the operating machine. It is understandable that the pressure sensor in this embodiment can be replaced with a flow rate sensor or a flow sensor; or both a pressure sensor and a flow sensor can be provided on the side of the nail head 301 away from the oil-blocking structure 202. The present invention does not make specific limitations on this.

[0059] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A fuel tank lock cover, characterized in that: include: Lock cover body (1); A mounting seat (2) is connected in cooperation with the lock cover body (1), and a mounting through hole (201) is provided on the mounting seat (2); The valve pin (3) is movably mounted in the mounting through hole (201) and has an open state and a sealed state. In the open state, a gap is left between the valve pin (3) and the mounting through hole (201) and an air intake passage is formed between the mounting seat (2) and the lock cover body (1); in the sealed state, the valve pin (3) blocks the mounting through hole (201) and an air exhaust passage is formed between the mounting seat (2) and the lock cover body (1).

2. The fuel tank lock cover according to claim 1, characterized in that: An oil-blocking structure (202) is provided in the mounting through hole (201), wherein the oil-blocking structure (202) comprises an oil-blocking ring (2021), and the valve nail (3) comprises a nail head (301) and a nail column (302), wherein the nail column (302) passes through the oil-blocking ring (2021) and a gap is left between the nail head (301) and the oil-blocking ring (2021), and in the open state, a gap is left between the nail head (301) and the oil-blocking ring (2021) so that the oil-blocking structure (202) is connected to the air intake passage.

3. The fuel tank lock cover according to claim 2, characterized in that: The oil-blocking structure (202) further comprises a sleeve (2022) extending from the outer peripheral surface of the oil-blocking ring (2021) along the axial direction of the oil-blocking ring (2021); a limit cover (203) is provided on the upper cover of the mounting through hole (201); the limit cover (203) comprises a cover body (2031) and an annular cover body (2032) extending toward the mounting through hole (201); a cover body (2031) is provided with a cover body (2032) connected to the mounting through hole (201) and the oil-blocking structure (202); The air vent (20311) is provided with a limiting space between the annular cover body (2032) and the inner side wall of the mounting through hole (201), and the sleeve (2022) is located in the limiting space; in the sealed state, the nail head (301) abuts against the oil-blocking ring (2021) and seals the connection between the nail column (302) and the oil-blocking ring (2021), and the gap between the sleeve (2022) and the inner side wall of the mounting through hole (201) is connected to the exhaust channel.

4. The fuel tank lock cover according to claim 3, characterized in that: A first spring (4) and a second spring (5) are provided between the limit cover (203) and the oil-blocking structure (202), the first spring (4) connecting the nail head (301) and the oil-blocking structure (202), and the second spring (5) connecting the limit cover (203) and the oil-blocking structure (202).

5. The fuel tank lock cover according to claim 3 or 4, characterized in that: The mounting through hole (201) is a stepped hole (2011) which is larger at the top and smaller at the bottom, and the oil-blocking structure (202) is arranged in the large end of the stepped hole (2011); the small end of the stepped hole (2011) is a countersunk hole (2012) which is larger at the top and smaller at the bottom, and a plurality of limiting protrusions (20121) are arranged at intervals on the bottom wall of the large end of the countersunk hole (2012); in the open state, a gap is left between the nail head (301) and the large end of the countersunk hole (2012) and is suitable for abutting against the limiting protrusion (20121).

6. The fuel tank lock cover according to claim 5, characterized in that: A rubber pad (6) is provided between the oil-blocking structure (202) and the nail head (301); a first annular protrusion (601) and a second annular protrusion (602) surrounding the first annular protrusion (601) are provided on the side of the small end of the rubber pad (6) facing the stepped hole (2011); the first annular protrusion (601) is suitable for abutting against the nail head (301); and the second annular protrusion (602) is suitable for abutting against the bottom wall of the large end of the stepped hole (2011).

7. The fuel tank lock cover according to claim 5, characterized in that: In the open state, the vent hole (20311), the oil-blocking structure (202), and the counterbore (2012) are connected in sequence to form the air inlet passage; in the sealed state, the counterbore (2012), the gap between the oil-blocking structure (202) and the stepped hole (2011), and the vent hole (20311) are connected in sequence to form the air exhaust passage.

8. The fuel tank lock cover according to any one of claims 2 to 4, characterized in that: A pressure sensor is provided on the side of the nail head (301) facing away from the oil-blocking structure (202).

9. A fuel tank, characterized in that: include: The fuel tank body is provided with a fuel filling port, and the inner wall of the fuel filling port is provided with an internal thread; The fuel tank lock cover according to any one of claims 1 to 8, wherein the mounting seat (2) is provided with an external thread suitable for engaging with the internal thread.

10. A working machine, characterized in that: include: Frame body; The oil tank described in claim 9 is provided on the frame body.

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