Outdoor folding oil tank

Abstract

The field folding oil tank comprises an oil tank body, the oil tank body comprises a rigid oil tank with one open end and the periphery closed and a flexible oil tank with one open end and the periphery closed, and the open end of the flexible oil tank and the open end of the rigid oil tank are connected in a sealed mode to jointly form the oil tank body with the variable internal volume; the telescopic mechanism comprises a guide sleeve fixed on the rigid oil tank, a telescopic rod is coaxially connected in the guide sleeve in a sliding manner, and one end of the telescopic rod extends out of the guide sleeve and is connected with one end, deviating from the open end, of the flexible oil tank. Due to the fact that the flexible oil tank is of a non-fixed structure, the flexible oil tank can be expanded or folded according to needs, when the flexible oil tank is folded, the boundary dimension of the oil tank body can be reduced, carrying is convenient, when the flexible oil tank stretches out, the volume of the oil tank body can be increased, the oil storage amount can be increased, and the volume of the oil tank body can be adjusted.

Description

Technical Field

[0001] This application relates to the field of fuel tank container technology, and in particular to a folding fuel tank for field use. Background Technology

[0002] Currently, commonly used fuel tanks are made of iron, aluminum, or air-cushioned materials. The selection depends on the requirements. Iron fuel tanks are bulky and heavy, making them unsuitable for field operations. While aluminum fuel tanks of the same volume are lighter than iron tanks, their softer surface makes them more susceptible to damage during field operations, leading to leaks. Commonly used air-cushioned fuel tanks lack air filters and level gauges, making it difficult to visually determine the amount of hydraulic oil in the tank. This makes them prone to overfilling and creating a vacuum. Summary of the Invention

[0003] This application provides a foldable fuel tank for field use to solve the problem that fuel tanks in related technologies have a fixed volume, occupy a large space, and are inconvenient to carry.

[0004] This application provides a folding fuel tank for field use, comprising:

[0005] The fuel tank body includes a rigid fuel tank with one end open and the other side closed, and a flexible fuel tank with one end open and the other side closed. The open end of the flexible fuel tank and the open end of the rigid fuel tank are sealed to each other to form a fuel tank body with variable internal volume.

[0006] The telescopic mechanism includes a guide sleeve fixed to the rigid oil tank, a telescopic rod slidably connected coaxially inside the guide sleeve, one end of the telescopic rod extending out of the guide sleeve and connected to the end of the flexible oil tank away from the open end.

[0007] In some implementations: the flexible tank includes a flexible cylinder that is hollow inside and open at both ends, and a rigid sealing plate that closes one open end of the flexible cylinder. The other open end of the flexible cylinder is sealed to the open end of the rigid tank, and the rigid sealing plate is fixedly connected to the telescopic rod.

[0008] In some implementations: one end of the flexible cylinder is fixedly connected to the open end of the rigid oil tank via a rigid pressure plate, and a sealant or sealing strip is provided between one end of the flexible cylinder and the open end of the rigid oil tank;

[0009] The other end of the flexible cylinder is fixedly connected to the rigid sealing plate via a rigid pressure plate. A sealant or sealing strip is provided between the other end of the flexible cylinder and the rigid sealing plate. The other end of the flexible cylinder is clamped between the rigid sealing plate and the rigid pressure plate.

[0010] In some implementations: the flexible cylinder includes annular connecting ends located at both open ends, and a hollow variable diameter section located between the two annular connecting ends, the diameter of the hollow variable diameter section gradually decreasing in the direction away from the annular connecting ends, and the hollow variable diameter section and the annular connecting ends are smoothly transitioned by an arc.

[0011] In some implementations: the flexible cylinder includes multiple concentrically arranged annular steel frames, and a flexible waterproof layer with a tubular structure is connected to the multiple annular steel frames. The inner wall of the flexible waterproof layer is fixedly connected to each of the annular steel frames.

[0012] In some implementations: at least two sets of the telescopic mechanism are provided, and the two sets of the telescopic mechanism are respectively arranged at the top and bottom of the rigid oil tank, and the telescopic rods of each set of the telescopic mechanism are respectively fixedly connected to the top and bottom of the rigid sealing plate of the flexible oil tank.

[0013] In some implementations: the telescopic mechanism further includes a push-pull rod detachably connected to the telescopic rod, one end of the push-pull rod is provided with a screw threadedly connected to the telescopic rod, and the end of the push-pull rod away from the screw is threadedly connected with a locking nut.

[0014] In some implementations: the rigid oil tank is a steel oil tank or an aluminum oil tank, the rigid oil tank is provided with an oil inlet and an oil outlet, and the rigid oil tank is provided with a transparent window for detecting the liquid level in the oil tank.

[0015] In some implementations: the rigid oil tank is equipped with an oil pump and a motor that drives the oil pump; the outlet of the oil pump is connected to a filter and an overflow valve; the outlet of the overflow valve is connected to a pipeline; and an oil pipe joint is connected to the pipeline.

[0016] In some implementations: the top of the rigid oil tank is equipped with a push-button switch and a pressure display, the push-button switch being electrically connected to the motor, and the pressure display being connected to the oil pump.

[0017] The beneficial effects of the technical solution provided in this application include:

[0018] This application provides a folding fuel tank for field use. The folding fuel tank includes a fuel tank body comprising a rigid fuel tank with one open end and closed sides, and a flexible fuel tank with one open end and closed sides. The open end of the flexible fuel tank and the open end of the rigid fuel tank are sealed together to form a fuel tank body with variable internal volume. A telescopic mechanism is also provided, including a guide sleeve fixed to the rigid fuel tank. A telescopic rod is coaxially slidably connected inside the guide sleeve, with one end of the telescopic rod extending out of the guide sleeve and connected to the end of the flexible fuel tank opposite to the open end.

[0019] Therefore, the field-use folding fuel tank of this application consists of two parts: a rigid fuel tank with one end open and all four sides closed, and a flexible fuel tank with one end open and all four sides closed. The open end of the flexible fuel tank and the open end of the rigid fuel tank are sealed together to form a fuel tank body with variable internal volume. Because the flexible fuel tank adopts a non-fixed structure, its volume can be unfolded or folded as needed. When the flexible fuel tank is folded, the external dimensions of the fuel tank body can be reduced for easy carrying. When the flexible fuel tank is extended, the volume of the fuel tank body can be increased, thereby increasing the amount of fuel stored and adjusting the volume of the fuel tank body.

[0020] Furthermore, the field-use folding fuel tank of this application is also equipped with a telescopic mechanism. This telescopic mechanism includes a guide sleeve fixed to the rigid fuel tank, and a telescopic rod slidably connected coaxially within the guide sleeve. When the telescopic rod extends from the guide sleeve, the flexible fuel tank extends into an unfolded state; when the telescopic rod retracts into the guide sleeve, the flexible fuel tank retracts into a folded, stowed state. Moreover, the guide sleeve and telescopic rod of the telescopic mechanism can serve as a support structure when the flexible fuel tank is in its unfolded state, fixing the flexible fuel tank to the rigid fuel tank and improving the structural stability of the flexible fuel tank. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a front view of the structure of this application embodiment in a folded state;

[0023] Figure 2 This is a front view of the structure in the unfolded state of an embodiment of this application;

[0024] Figure 3 This is a right view of the structure of an embodiment of this application;

[0025] Figure 4 This is a top view of the structure of an embodiment of this application.

[0026] Figure label:

[0027] 10. Oil tank body; 11. Rigid oil tank; 12. Flexible oil tank; 13. Flexible cylinder; 14. Rigid sealing plate; 15. Oil inlet; 16. Oil outlet; 17. Transparent window; 18. Push-button switch; 19. Pressure indicator; 20. Telescopic mechanism; 21. Guide sleeve; 22. Telescopic rod; 23. Push-pull rod; 24. Locking nut. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] This application provides a foldable fuel tank for field use, which solves the problem in related technologies that fuel tanks have a fixed volume, occupy a large space, and are inconvenient to carry.

[0030] See Figures 1 to 3 As shown in the figure, this application provides a folding fuel tank for field use, comprising:

[0031] The fuel tank body 10 includes a rigid fuel tank 11 with one end open and the other side closed, and a flexible fuel tank 12 with one end open and the other side closed. The open end of the flexible fuel tank 12 is sealed to the open end of the rigid fuel tank 11 to form a fuel tank body 10 with variable internal volume. The flexible fuel tank 12 and the rigid fuel tank 11 are interconnected to form a cavity for containing fuel. The flexible fuel tank 12 has unfolding and folding functions. When the flexible fuel tank 12 is unfolded, the volume of the fuel tank body 10 can be increased. When the flexible fuel tank 12 is folded, the volume of the fuel tank body 10 can be reduced, making it convenient to carry.

[0032] The telescopic mechanism 20 includes a guide sleeve 21 fixed to the rigid oil tank 11. A telescopic rod 22 of variable length is coaxially slidably connected within the guide sleeve 21. The telescopic rod 22 includes a first support rod and a second support rod coaxially arranged and slidably connected to each other to adjust the extension length of the telescopic rod 22. One end of the telescopic rod 22 extends out of the guide sleeve 21 and is connected to the end of the flexible oil tank 12 opposite to the open end. The telescopic rod 22 slides within the guide sleeve 21. When the telescopic rod 22 extends within the guide sleeve 21, it switches the flexible oil tank 12 from a folded state to an unfolded state; when the telescopic rod 22 retracts within the guide sleeve 21, it switches the flexible oil tank 12 from an unfolded state to a folded state.

[0033] The fuel tank body 10 of this application embodiment for field use consists of a rigid fuel tank 11 with one end open and the other side closed, and a flexible fuel tank 12 with one end open and the other side closed. The open end of the flexible fuel tank 12 and the open end of the rigid fuel tank 11 are sealed to each other to form a fuel tank body 10 with variable internal volume. Since the flexible fuel tank 12 adopts a non-fixed structure, the volume of the flexible fuel tank 12 can be unfolded or folded as needed. When the flexible fuel tank 12 is folded, the external size of the fuel tank body 10 can be reduced, making it easy to carry. When the flexible fuel tank 12 is extended, the volume of the fuel tank body 10 can be increased, thereby increasing the amount of fuel stored and adjusting the volume of the fuel tank body 10.

[0034] Furthermore, the field-use folding fuel tank of this application is also equipped with a telescopic mechanism 20. The telescopic mechanism 20 includes a guide sleeve 21 fixed to the rigid fuel tank 11. A telescopic rod 22 is coaxially slidably connected inside the guide sleeve 21. When the telescopic rod 22 extends from inside the guide sleeve 21, the flexible fuel tank 12 extends into an unfolded state. When the telescopic rod 22 retracts into the guide sleeve 21, the flexible fuel tank 12 retracts into a folded storage state. Moreover, the guide sleeve 21 and the telescopic rod 22 of the telescopic mechanism 20 can serve as a support structure when the flexible fuel tank 12 is in the unfolded state, fixing the flexible fuel tank 12 to the rigid fuel tank 11 and improving the structural stability of the flexible fuel tank 12.

[0035] In some alternative implementations: see Figures 1 to 3 As shown in the illustration, this application provides a folding fuel tank for field use. The flexible fuel tank 12 includes a hollow, open-ended flexible cylinder 13 and a rigid sealing plate 14 that closes one open end of the flexible cylinder 13. The other open end of the flexible cylinder 13 is sealed to the open end of the rigid fuel tank 11, and the rigid sealing plate 14 is fixedly connected to the telescopic rod 22. The flexible cylinder 13 of the flexible fuel tank 12 is made of a flexible waterproof material, which has good deformation and expansion properties to accommodate changes in the internal cavity.

[0036] The rigid sealing plate 14 of the flexible tank 12 is used to close one open end of the flexible cylinder 13. The rigid sealing plate 14 can be made of rigid waterproof material such as metal sheet or engineering plastic sheet. The rigid sealing plate 14 is not only used to close one open end of the flexible cylinder 13, but also to connect the telescopic rod 22. When the telescopic rod 22 extends out of the guide sleeve 21, it pushes the rigid sealing plate 14 to extend the flexible cylinder 13 into an unfolded state. When the telescopic rod 22 retracts into the guide sleeve 21, it pulls the rigid sealing plate 14 to retract the flexible cylinder 13 into a folded storage state.

[0037] In some alternative implementations: see Figures 1 to 3As shown in the illustration, this application provides a field-use folding fuel tank. One end of the flexible cylindrical body 13 of the field-use folding fuel tank is fixedly connected to the open end of the rigid fuel tank 11 via a rigid pressure plate. A sealant or sealing strip is provided between one end of the flexible cylindrical body 13 and the open end of the rigid fuel tank 11. The other end of the flexible cylindrical body 13 is fixedly connected to the rigid sealing plate 14 via a rigid pressure plate. A sealant or sealing strip is provided between the other end of the flexible cylindrical body 13 and the rigid sealing plate 14. The other end of the flexible cylindrical body 13 is clamped between the rigid sealing plate 14 and the rigid pressure plate.

[0038] In some alternative implementations: see Figures 1 to 3 As shown in the illustration, this application provides a field-use folding fuel tank. The flexible cylindrical body 13 of the field-use folding fuel tank includes annular connecting ends located at both open ends, and a hollow variable-diameter section located between the two annular connecting ends. The diameter of the hollow variable-diameter section gradually decreases in the direction away from the annular connecting ends, and the hollow variable-diameter section and the annular connecting ends are smoothly transitioned by an arc. The annular connecting ends at both open ends of the flexible cylindrical body 13 are used to seal and connect the rigid fuel tank 11 and the rigid sealing plate 14 respectively, thereby improving the structural strength and sealing performance of the connection between the flexible cylindrical body 13 and the rigid fuel tank 11 and the rigid sealing plate 14.

[0039] The diameter of the hollow variable-diameter section gradually decreases towards the direction away from the annular connecting end, giving the hollow variable-diameter section an overall trumpet-shaped structure that is thinner in the middle and thicker at both ends. The hollow variable-diameter section and the annular connecting end are smoothly transitioned by an arc. When the telescopic rod 22 retracts into the guide sleeve 21 and pulls the rigid sealing plate 14, the hollow variable-diameter section contracts under the guidance of the arc and retracts into the rigid oil tank 11. The hollow variable-diameter section and the annular connecting end are integrally formed from flexible material; the flexible cylinder 13 can be made of tendon or rubber.

[0040] In some alternative implementations: see Figures 1 to 3 As shown in the illustration, this application provides a field-use folding fuel tank. The flexible cylindrical body 13 of the field-use folding fuel tank includes multiple concentrically arranged annular steel frames. A flexible waterproof layer with a tubular structure is connected to the multiple annular steel frames, and the inner wall of the flexible waterproof layer is fixedly connected to each annular steel frame. The annular steel frames and the flexible waterproof layer are interconnected to form a retractable corrugated pipe structure. The annular steel frames provide radial support for the flexible waterproof layer, which serves as a waterproof structure for storing fuel.

[0041] In some alternative implementations: see Figures 1 to 3As shown in the figure, this application embodiment provides a field-use folding fuel tank. The field-use folding fuel tank has at least two sets of telescopic mechanisms 20, which are respectively arranged at the top and bottom of the rigid fuel tank 11. The telescopic rods 22 of each set of telescopic mechanisms 20 are fixedly connected to the top and bottom of the rigid sealing plate 14 of the flexible fuel tank 12. The telescopic mechanism 20 also includes a push-pull rod 23 detachably connected to the telescopic rod 22. One end of the push-pull rod 23 is provided with a screw threadedly connected to the telescopic rod 22, and the end of the push-pull rod 23 away from the screw is threadedly connected to a locking nut 24.

[0042] At least two sets of telescopic mechanisms 20 are provided in this embodiment. The two sets of telescopic mechanisms 20 are respectively arranged at the top and bottom of the rigid oil tank 11. The two sets of telescopic mechanisms 20 are used to synchronously drive the upper and lower ends of the flexible oil tank 12 to unfold and fold. The telescopic rod 22 is detachably connected to the push-pull rod 23 through a screw. The telescopic rod 22 is used to push and pull the telescopic rod 22 to extend and retract within the guide sleeve 21, thereby unfolding or retracting the flexible oil tank 12. When the flexible oil tank 12 is unfolded or retracted, the locking nut 24 is connected to the push-pull rod 23, thereby keeping the unfolded or retracted length of the flexible oil tank 12 in a stable state.

[0043] In some alternative implementations: see Figure 4 As shown in the figure, this application embodiment provides a field-use folding fuel tank. The rigid fuel tank 11 of the field-use folding fuel tank is a steel fuel tank or an aluminum fuel tank. The rigid fuel tank 11 is provided with an oil inlet 15 and an oil outlet 16. The rigid fuel tank 11 is provided with a transparent viewing window 17 for detecting the liquid level in the fuel tank body 10. The rigid fuel tank 11 is provided with an equipment compartment, which contains an oil pump and a motor that drives the oil pump. The outlet of the oil pump is connected to a filter and an overflow valve. The outlet of the overflow valve is connected to a pipeline, and an oil pipe connector is connected to the pipeline. A push-button switch 18 is provided on the top of the rigid fuel tank 11. The push-button switch 18 is electrically connected to the motor, and a pressure display 19 is connected to the oil pump.

[0044] Working principle

[0045] This application provides a folding fuel tank for field use. The folding fuel tank for field use of this application is provided with a fuel tank body 10, which includes a rigid fuel tank 11 with one end open and the other side closed, and a flexible fuel tank 12 with one end open and the other side closed. The open end of the flexible fuel tank 12 and the open end of the rigid fuel tank 11 are sealed to each other to form a fuel tank body 10 with variable internal volume. The telescopic mechanism 20 includes a guide sleeve 21 fixed on the rigid fuel tank 11. A telescopic rod 22 is slidably connected coaxially inside the guide sleeve 21. One end of the telescopic rod 22 extends out of the guide sleeve 21 and is connected to the end of the flexible fuel tank 12 away from the open end.

[0046] Therefore, the fuel tank body 10 of the field-use folding fuel tank of this application consists of a rigid fuel tank 11 with one end open and the other side closed, and a flexible fuel tank 12 with one end open and the other side closed. The open end of the flexible fuel tank 12 and the open end of the rigid fuel tank 11 are sealed to each other to form a fuel tank body 10 with variable internal volume. Since the flexible fuel tank 12 adopts a non-fixed structure, the volume of the flexible fuel tank 12 can be unfolded or folded as needed. When the flexible fuel tank 12 is folded, the external size of the fuel tank body 10 can be reduced, making it easy to carry. When the flexible fuel tank 12 is extended, the volume of the fuel tank body 10 can be increased, thereby increasing the amount of fuel stored and adjusting the volume of the fuel tank body 10.

[0047] Furthermore, the field-use folding fuel tank of this application is also equipped with a telescopic mechanism 20. The telescopic mechanism 20 includes a guide sleeve 21 fixed to the rigid fuel tank 11. A telescopic rod 22 is coaxially slidably connected inside the guide sleeve 21. When the telescopic rod 22 extends from inside the guide sleeve 21, the flexible fuel tank 12 extends into an unfolded state. When the telescopic rod 22 retracts into the guide sleeve 21, the flexible fuel tank 12 retracts into a folded storage state. Moreover, the guide sleeve 21 and the telescopic rod 22 of the telescopic mechanism 20 can serve as a support structure when the flexible fuel tank 12 is in the unfolded state, fixing the flexible fuel tank 12 to the rigid fuel tank 11 and improving the structural stability of the flexible fuel tank 12.

[0048] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0049] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0050] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A folding fuel tank for field use, characterized in that, include: The fuel tank body (10) includes a rigid fuel tank (11) with one end open and the four sides closed, and a flexible fuel tank (12) with one end open and the four sides closed. The open end of the flexible fuel tank (12) and the open end of the rigid fuel tank (11) are sealed to each other to form a fuel tank body (10) with variable internal volume. The telescopic mechanism (20) includes a guide sleeve (21) fixed on the rigid oil tank (11), and a telescopic rod (22) is slidably connected coaxially inside the guide sleeve (21). One end of the telescopic rod (22) extends out of the guide sleeve (21) and is connected to the end of the flexible oil tank (12) away from the open end.

2. The field-use folding fuel tank as described in claim 1, characterized in that: The flexible oil tank (12) includes a flexible cylinder (13) that is hollow inside and open at both ends, and a rigid sealing plate (14) that closes one open end of the flexible cylinder (13). The other open end of the flexible cylinder (13) is sealed to the open end of the rigid oil tank (11). The rigid sealing plate (14) is fixedly connected to the telescopic rod (22).

3. A folding fuel tank for field use as described in claim 2, characterized in that: One end of the flexible cylinder (13) is fixedly connected to the open end of the rigid oil tank (11) through a hard pressure plate, and a sealant or sealing strip is provided between one end of the flexible cylinder (13) and the open end of the rigid oil tank (11). The other end of the flexible cylinder (13) is fixedly connected to the rigid sealing plate (14) through a hard pressure plate. A sealant or sealing strip is provided between the other end of the flexible cylinder and the rigid sealing plate. The other end of the flexible cylinder (13) is clamped between the rigid sealing plate (14) and the hard pressure plate.

4. A folding fuel tank for field use as described in claim 2, characterized in that: The flexible cylinder (13) includes annular connecting ends located at both open ends, and a hollow variable diameter section located between the two annular connecting ends. The diameter of the hollow variable diameter section gradually decreases in the direction away from the annular connecting ends, and the hollow variable diameter section and the annular connecting ends are smoothly transitioned by a circular arc.

5. A folding fuel tank for field use as described in claim 2, characterized in that: The flexible cylinder includes multiple concentric annular steel frames, and a flexible waterproof layer with a tubular structure is connected to each of the multiple annular steel frames. The inner wall of the flexible waterproof layer is fixedly connected to each of the annular steel frames.

6. A folding fuel tank for field use as described in claim 2, characterized in that: The telescopic mechanism (20) is provided in at least two sets, and the two sets of telescopic mechanisms (20) are respectively arranged at the top and bottom of the rigid oil tank (11). The telescopic rod (22) of each set of telescopic mechanisms (20) is fixedly connected to the top and bottom of the rigid sealing plate (14) of the flexible oil tank (12).

7. A field-use folding fuel tank as described in claim 1 or 6, characterized in that: The telescopic mechanism (20) also includes a push-pull rod (23) detachably connected to the telescopic rod (22). One end of the push-pull rod (23) is provided with a screw threadedly connected to the telescopic rod (22), and the end of the push-pull rod (23) away from the screw is threadedly connected with a locking nut (24).

8. A folding fuel tank for field use as described in claim 1, characterized in that: The rigid oil tank (11) is a steel oil tank or an aluminum oil tank. The rigid oil tank (11) is provided with an oil inlet (15) and an oil outlet (16). The rigid oil tank (11) is provided with a transparent window (17) for detecting the liquid level in the oil tank body (10).

9. A folding fuel tank for field use as described in claim 1, characterized in that: The rigid oil tank (11) is equipped with an oil pump and a motor that drives the oil pump. The outlet of the oil pump is connected to a filter and an overflow valve. The outlet of the overflow valve is connected to a pipeline, and an oil pipe joint is connected to the pipeline.

10. A folding fuel tank for field use as described in claim 9, characterized in that: The top of the rigid oil tank (11) is provided with a push button switch (18) and a pressure display (19). The push button switch (18) is electrically connected to the motor, and the pressure display (19) is connected to the oil pump.

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