Oil tank device convenient to install

Abstract

The invention discloses an oil tank device convenient to install, and relates to the technical field of engineering machine accessories. According to the scheme, the device comprises a fixed oil tank; the movable oil tank is separably arranged above the fixed oil tank; the butt joint mechanism comprises a first butt joint part arranged on the fixed oil tank and a second butt joint part arranged on the movable oil tank; when the movable oil tank is in butt joint with the fixed oil tank, the first butt joint part and the second butt joint part are communicated in a sealed mode so that fuel oil in the movable oil tank can be guided into the fixed oil tank. Automatic and closed gravity supply of fuel oil in the movable oil tank to the fixed oil tank is achieved in the uninterrupted operation state of the equipment, and therefore the problems that operation is interrupted and efficiency is low due to the fact that traditional single-oil-tank equipment must be shut down for refueling are solved.

Description

Technical Field

[0001] This invention relates to the field of engineering machinery parts technology, and in particular to a fuel tank device that is easy to install. Background Technology

[0002] Diesel-powered air compressors, generators, and various engineering machinery serve as mobile power sources and are widely used in field or in situations without fixed power sources, such as infrastructure construction, mining, and disaster relief. These devices are typically driven by diesel engines, and their continuous operating capacity is limited by the capacity of the onboard fuel tank. In actual operations, especially under conditions of long-term continuous construction, when the fuel runs out, the machine must be stopped for refueling. This not only interrupts the construction process and reduces equipment utilization and work efficiency, but may also cause direct economic losses in time-sensitive work scenarios.

[0003] To address the aforementioned issues, existing technologies primarily employ two improvement approaches: one is to simply increase the volume of the fixed fuel tank, but this increases the initial size and weight of the equipment, affecting its mobility and still cannot fundamentally prevent downtime during refueling; the other is to install an additional spare fuel tank next to the equipment, transferring fuel from the tank to the equipment's fuel tank via a manual pump or gravity during refueling. This method still requires a short downtime, is cumbersome, and poses risks such as fuel spillage, environmental pollution, and safety hazards. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to solve the above-mentioned problems.

[0005] To achieve the above-mentioned technical objectives, the present invention provides a conveniently installed fuel tank device. Includes: a fixed fuel tank; A movable fuel tank is detachably mounted above the fixed fuel tank; The docking mechanism includes a first docking part disposed on a fixed oil tank and a second docking part disposed on a movable oil tank; When the movable fuel tank is connected to the fixed fuel tank, the first docking part and the second docking part are sealed and connected to transfer the fuel in the movable fuel tank into the fixed fuel tank.

[0006] Preferably, the first mating portion includes a first valve stem and a first elastic element that provides a first preload, and the second mating portion includes a second valve stem and a second elastic element that provides a second preload. In the non-docked state, the first preload and the second preload respectively drive the first valve stem and the second valve stem to remain closed and sealed; In the docking state, the ends of the first valve stem and the second valve stem abut against each other and move away from each other, together overcoming the first preload and the second preload to open the connecting oil passage.

[0007] Preferably, the first docking portion further includes a first locking member for limiting unintended movement of the first valve stem, and the second docking portion further includes a second locking member for limiting unintended movement of the second valve stem; During the pushing and connecting process between the movable oil tank and the fixed oil tank, the first locking member and the second locking member are unlocked in sequence, after which the first valve stem and the second valve stem can be pushed.

[0008] Preferably, the first locking member is a first retaining ring, which partially engages with the first limiting ring groove of the first valve stem; the second locking member is a second retaining ring, which partially engages with the second limiting ring groove of the second valve stem.

[0009] Preferably, the second docking portion further includes a docking outer sleeve, the inner wall of which is provided with an annular shoulder; During the docking process, the annular shoulder compresses the first retaining spring to disengage it from the first limiting ring groove, while the end of the first docking part compresses the second retaining spring to disengage it from the second limiting ring groove.

[0010] Preferably, the top of the fixed oil tank is provided with a recess for accommodating and guiding the movable oil tank, and the recess is provided with a raised guide strip; the bottom of the movable oil tank is provided with a recessed guide groove that cooperates with the raised guide strip.

[0011] Preferably, the fixed oil tank is provided with a limiting protrusion, and the movable oil tank is provided with a limiting groove that cooperates with the limiting protrusion, which is used to provide vertical limiting when the movable oil tank is pushed into place.

[0012] Preferably, it also includes a tank limiter for locking the movable tank after it has been pushed into place.

[0013] Preferably, the housing limiter includes a hinged pressure arm, one end of which is provided with a pressure finger for pressing the movable oil tank. When the other end of the pressure arm is pressed down, the pressure finger end can apply an auxiliary propulsive force to the movable oil tank.

[0014] Preferably, the docking area of ​​the fixed fuel tank and / or the movable fuel tank is set as an inclined surface so that the fuel converges under the action of gravity.

[0015] As can be seen from the above technical solutions, this application has the following beneficial effects: 1. By setting up a movable oil tank located above the fixed oil tank, and a sealed docking mechanism consisting of a first docking part and a second docking part, automatic and closed gravity replenishment of fuel from the movable oil tank to the fixed oil tank is achieved while the equipment is running continuously, thus solving the problem of operation interruption and low efficiency caused by the traditional single oil tank equipment having to stop for refueling. 2. Through the guiding structure composed of raised guide strips and recessed guide grooves, and the positioning structure composed of limiting protrusions and limiting grooves, combined with the box limiter that has both lever assistance and mechanical locking functions, the movable oil tank can be quickly and accurately pushed in and firmly locked, as well as the empty oil tank can be easily removed and replaced, thus solving the problems of cumbersome, laborious and unreliable positioning in the process of replacing the spare oil tank. 3. By setting up a double safety mechanism in which a pre-tightening spring drives a conical valve stem to form a normally closed seal and a first and second retaining ring are used for axial locking, the sealing reliability of the docking mechanism is ensured in the non-connected state and during docking, effectively preventing fuel leakage caused by equipment vibration or accidental collision, thereby significantly improving the safety and environmental friendliness of the entire fuel supply system. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 A schematic diagram of the overall structure of a conveniently installed fuel tank device provided by the present invention; Figure 2 An exploded structural diagram of a conveniently installed fuel tank device provided by the present invention; Figure 3 A schematic diagram of the overall structure of a movable fuel tank for a conveniently installed fuel tank device provided by the present invention; Figure 4 A cross-sectional view of the first docking portion of a fuel tank device that is easy to install according to the present invention; Figure 5 A cross-sectional view of the second docking portion of a fuel tank device that is easy to install according to the present invention; Figure 6 An exploded structural diagram of the first docking portion of a conveniently installed fuel tank device provided by the present invention; Figure 7 An exploded structural diagram of the second docking portion of a fuel tank device that is easy to install according to the present invention; Figure 8 A schematic diagram of the overall structure of the second valve stem and the second snap ring of an oil tank device that is easy to install according to the present invention; Figure 9 A schematic diagram of a conveniently installed fuel tank device provided by the present invention applied to a diesel-powered air compressor; Figure 10This is a schematic diagram of the overall structure of the chassis and protective plate provided by the present invention; Figure 11 This is a cross-sectional structural diagram of the chassis and protective disc provided by the present invention; Figure 12 This is a schematic diagram of the overall structure of the housing limiter provided by the present invention. Attached image description: 10. Fixed oil tank; 11. Protrusion; 12. Recess; 121. Protruding guide strip; 13. Limiting protrusion; 20. Movable fuel tank; 21. Handle; 22. Recessed guide groove; 23. Limiting groove; 30. First mating part; 31. Sealing sleeve; 32. First valve stem; 321. First oil passage groove; 322. First limiting ring groove; 33. First snap ring; 34. Sealing ring; 35. First cross-shaped limiting ring; 36. First spring; 37. First limiting ring; 40. Second docking part; 41. Outer docking tube; 411. Annular shoulder; 42. Inner docking tube; 43. Second valve stem; 431. Second oil passage groove; 432. Second limiting ring groove; 44. Second cross limiting ring; 45. Second spring; 46. Second limiting ring; 47. Second snap ring; 50. Chassis; 60. Protective plate; 70. Box limit switch; 71. Cross pressure arm; 711. Pressure finger; 712. Limit handle; 72. Connecting pin; 80. Forklift feet; 90. Diesel-powered air compressor. Detailed Implementation

[0019] The following description is exemplary in nature and is not intended to limit the scope, application, or use of this disclosure. It should be understood that in all these figures, the same or similar reference numerals indicate the same or similar parts and features. The figures are merely schematic representations of the concept and principles of embodiments of this disclosure and do not necessarily show the specific dimensions and scale of the various embodiments of this disclosure. Certain details or structures of embodiments of this disclosure may be exaggerated in particular portions of certain figures.

[0020] Example 1, see Figures 1-8As shown, a conveniently installed fuel tank device includes a fixed fuel tank 10 and a movable fuel tank 20 slidably disposed above the fixed fuel tank 10. The fixed fuel tank 10 is used to dock with the equipment to which it is applied, and its oil outlet is directly connected to the oil inlet of the equipment to which it is applied through an oil pipe. The movable fuel tank 20 serves as an auxiliary replaceable refueling tank and is sealed and connected to the fixed fuel tank 10 through a docking mechanism to replenish the diesel fuel inside the movable fuel tank 20 into the fixed fuel tank 10. Since the movable fuel tank 20 is located above the fixed fuel tank 10, when the two are connected, the fuel in the movable fuel tank 20 is consumed preferentially under the action of gravity. The unloaded movable oil tank 20 can be detached from the fixed oil tank 10 and safely refueled away from the work site, or replaced with a fully loaded spare movable oil tank 20 without affecting the independent operation of the fixed oil tank 10, thus achieving uninterrupted operation of the equipment.

[0021] The fixed fuel tank 10 is made of metal sheet by integral stamping, and has excellent structural strength and sealing performance. Its top surface has an upward protrusion 11. The upper surface of the protrusion 11 serves as a functional integration platform for installing the oil outlet pipe connector, the oil detection sensor mounting base, and other necessary fuel line accessories that are connected to the equipment to which it is applied.

[0022] One side of the protrusion 11 is recessed downward to form a recess 12. The bottom surface of the recess 12 is lower than the protrusion 11 of the fixed oil tank 10, and is used to accommodate the movable oil tank 20. For positioning and guidance, a protruding guide strip 121 parallel to the pulling direction of the movable oil tank 20 is further stamped in the recess 12. A limiting protrusion 13 is also integrally formed on the protrusion 11. The movable oil tank 20 is also made of metal sheet by integral stamping and welding. Its shape matches the contour of the recessed part 12. The recessed guide groove 22 is stamped to the position of the protruding guide strip 121 opposite to the recessed part 12. The shape of the recessed guide groove 22 is complementary to the protruding guide strip 121. When the movable oil tank 20 is placed on the fixed oil tank 10, the protruding guide strip 121 is embedded in the recessed guide groove 22, providing linear guidance and left and right direction limit for the pushing and pulling of the movable oil tank 20. On the upper surface of the movable oil tank 20, a limit groove 23 is stamped to the position of the limit protrusion 13. When the movable oil tank 20 is pushed into place along the guide strip 121, the limit protrusion 13 is engaged in the limit groove 23, providing up and down direction limit.

[0023] A handle 21 is welded to the side of the movable oil tank 20 away from the protrusion 11 for easy handling and pulling operation. The movable oil tank 20 is also equipped with a filler port with a cap and a one-way vent valve. The one-way vent valve can release air during refueling and maintain the pressure balance inside and outside the oil tank.

[0024] The docking mechanism includes a first docking part 30 and a second docking part 40. The first docking part 30 is inserted and fixed on the side wall of the protrusion 11, and its open end faces the inside of the recess 12, that is, towards the position after the movable oil tank 20 is installed. The second docking part 40 is inserted and fixed on the movable oil tank 20, and its position corresponds to the first docking part 30 after the movable oil tank 20 and the fixed oil tank 10 are docked.

[0025] For details, please refer to Figure 2 , Figure 4 and Figure 6 As shown, the first docking part 30 includes a sealing sleeve 31, a first valve stem 32, a first locking member, a sealing ring 34, a first cross-shaped limiting ring 35, a first elastic member, and a first limiting ring 37. The sealing sleeve 31 is a tubular part with both ends through it. Its tube wall is sealed through and fixed to the side wall of the protrusion 11 by welding or threaded connection, so that it is connected to the interior of the fixed oil tank 10. The inner hole of the sealing sleeve 31 is provided with a tapered sealing section. On the inner wall of the end of the sealing sleeve 31 facing the outside of the fixed oil tank 10, a groove is machined for installing the sealing ring 34. The first valve stem 32 is a stepped shaft and is installed in the inner hole of the sealing sleeve 31. A first limiting ring 37 is fitted and fixed on the middle part of the first valve stem 32. The first elastic element is a first spring 36, which is fitted on the first valve stem 32. One end of the spring 36 abuts against the first limiting ring 37, and the other end abuts against the first cross limiting ring 35. The first cross limiting ring 35 is fixed in the sealing sleeve 31 by interference fit or thread. The first valve stem 32 and the first cross limiting ring 35 are axially slidably connected. One end of the first valve stem 32 located inside the fixed oil tank 10 is a tapered head. The taper of the tapered head matches the tapered sealing section of the inner hole of the sealing sleeve 31. The preload of the first spring 36 always drives the tapered head of the first valve stem 32 to press against the tapered sealing section, maintaining a normally closed state and forming a metal-conical sealing pair, thereby cutting off the oil circuit. Multiple axially extending first oil passage grooves 321 are evenly provided around the outer periphery of the conical head of the first valve stem 32. When the first valve stem 32 is pushed toward the inside of the fixed oil tank 10, causing its conical head to disengage from the conical sealing section, the cavity of the fixed oil tank 10 can be connected to the outside through the first oil passage grooves 321.

[0026] The first locking element is a first retaining spring 33. A first limiting ring groove 322 is also machined on the outer surface of the first valve stem 32 at the end away from the conical head. The first retaining spring 33 is made of elastic metal wire bent into a V-shape on the inner side of the sealing sleeve 31 and is locked in the first limiting ring groove 322. The end of the retaining spring passes through the sealing sleeve 31 for sealing and sliding connection, and the outer part is bent axially with the first valve stem 32 so that it elastically abuts against the outer surface of the sealing sleeve 31. The function of the first retaining spring 33 is to restrict the axial movement of the first valve stem 32 in the non-butt state and prevent it from moving due to vibration or accidental contact, which would cause the seal to fail. Only when the first retaining spring 33 is compressed radially inward, causing its V-shaped end to disengage from the first limiting ring groove 322, can the first valve stem 32 be pushed axially.

[0027] For more details, please refer to Figure 3 , Figure 5 and Figure 7 As shown, the second docking part 40 includes a docking outer tube 41, a docking inner tube 42, a second valve stem 43, a second cross-shaped limiting ring 44, a second elastic element, a second limiting ring 46, and a second locking element; The connecting outer sleeve 41 is a pipe fitting with a flange at one end and both ends connected. It is sealed to the movable oil tank 20 through the flange. The section of the connecting outer sleeve 41 near the movable oil tank 20 has an annular shoulder 411. The inner wall of the annular shoulder 411 is inclined, and the diameter of the annular shoulder 411 at the end is larger than the diameter of the other end of the annular shoulder 411. The inner tube 42 is fixed inside the outer tube 41. One end of the inner tube 42 is sealed and fixed to the inner wall of the outer tube 41 by threads and communicates with the inside of the movable oil tank 20. The outer diameter of the rest of the inner tube 42 is reduced, that is, an annular gap is maintained between its outer wall and the inner wall of the outer tube 41. This gap forms a channel for the sealing sleeve 31 of the first docking part 30 to be inserted. The central through hole structure of the inner tube 42 is similar to that of the sealing sleeve 31, and also includes a conical sealing section. The second valve stem 43 is located in the central through hole of the docking inner tube 42. Its structure and working principle are symmetrical and similar to those of the first valve stem 32. One end of the second valve stem 43 located inside the movable oil tank 20 is a tapered head, which is used to cooperate with the tapered sealing section of the docking inner tube 42 to form a seal. The stem body has a second oil passage groove 431 and a second limiting ring groove 432. The second limiting ring 46 is fixed on the second valve stem 43. The second elastic element is a second spring 45. The second spring 45 is sleeved on the second valve stem 43, and its two ends abut against the second limiting ring 46 and the second cross limiting ring 44 fixed inside the docking inner tube 42, so that the second valve stem 43 remains normally closed. The second locking element is the second snap ring 47. The structure and function of the second snap ring 47 are exactly the same as those of the first snap ring 33. It passes through the wall of the docking outer sleeve 41 and is connected in a sealed sliding manner. The inner side is inserted into the second limiting ring groove 432 of the second valve stem 43, and the outer side elastically abuts against the outer wall of the docking outer sleeve 41, which is used to lock the second valve stem 43 in the non-docked state.

[0028] For example, during the docking process of the second docking part 40 and the first docking part 30, the end of the sealing sleeve 31 is first inserted into the annular gap between the docking outer sleeve 41 and the docking inner tube 42. As the insertion depth increases, the sealing ring 34 at the end of the sealing sleeve 31 contacts the outer wall of the docking inner tube 42 and forms a sliding seal, thus forming a sealed channel between the movable oil tank 20, the second docking part 40, the first docking part 30 and the fixed oil tank 10. Continue pushing in the movable oil tank 20, the annular shoulder 411 of the connecting outer sleeve 41 contacts and presses the part of the first retaining ring 33 that extends out of the sealing sleeve 31. Since the inner diameter of the annular shoulder 411 is smaller than the outer diameter of the outer abutment point of the first retaining ring 33, the first retaining ring 33 is compressed radially inward, and its inner V-shaped end disengages from the first limiting ring groove 322 of the first valve stem 32, releasing the axial limit on the first valve stem 32. At the same time, the end face of the sealing sleeve 31 continues to advance, and begins to contact and squeeze the second snap ring 47 of the second mating part 40. Similarly, the second snap ring 47 is squeezed radially inward, and its inner V-shaped end disengages from the second limiting ring groove 432 of the second valve stem 43, releasing the axial limit on the second valve stem 43. When the movable oil tank 20 is fully pushed into place and the limiting protrusion 13 is engaged in the limiting groove 23, the first docking part 30 and the second docking part 40 also reach the preset docking position. At this time, the end of the first valve stem 32 and the end of the second valve stem 43 abut against each other and move axially away from each other, forming a sealed oil passage between the movable oil tank 20, the second docking part 40, the first docking part 40 and the fixed oil tank 10. The oil in the movable oil tank 20 can flow into the docking inner tube 42 through the second oil groove 431 on the second valve stem 43, then into the sealing sleeve 31, and finally into the fixed oil tank 10 through the first oil groove 321 on the first valve stem 32. After docking, the entire connecting channel is surrounded by the sealing sleeve 31 and the docking outer sleeve 41 and is under sealed protection. Moreover, the mechanical lock must be released in strict sequence during the docking process, which effectively avoids accidental leakage caused by vibration or accidental contact.

[0029] Example 2, see Figures 9-12As shown, based on the above embodiment, the fuel tank device is applied to a diesel-powered air compressor 90. The bottom of the diesel-powered air compressor 90 is fixedly installed on the upper surface of the chassis 50. The chassis 50 is fixed to the upper surface of the protective plate 60 by bolts. The bottom of the protective plate 60 is fixed with forklift feet 80 for forklift forks to insert into. The fixed fuel tank 10 is disposed in the space between the chassis 50 and the protective plate 60, and its bottom is fixed inside the protective plate 60 by bolts. The protective plate 60 is used to protect and fix the fuel tank 10. The corresponding side walls of the 0 and the chassis 50 are provided with slots for the horizontal extraction of the movable oil tank 20. The tank limiter 70 is installed at the slot to lock the movable oil tank 20 after it is installed. The docking point of the movable oil tank 20 and the fixed oil tank 10 can be tilted towards the protective plate 60. The protective plate 60 serves as the main support. When the fixed oil tank 10 and the movable oil tank 20 are placed horizontally on the ground, the tilted fixed oil tank 10 and the movable oil tank 20 facilitate the oil stored in the fixed oil tank 10 and the movable oil tank 20 to converge into the fixed oil tank 10.

[0030] The box limiter 70 includes a connecting post 72 and a cross pressure arm 71. The connecting post 72 is fixedly installed on the chassis 50 or the protective plate 60. One end of the cross pressure arm 71 is hinged to the connecting post 72 through a rotating shaft, and the other end is fitted with a sliding connection limit handle 712. The limit handle 712 is equipped with a return spring inside to provide elastic force for the limit handle 712. The pressure finger 711 is fixed on both sides of the cross end of the cross pressure arm 71 for connecting to the handle 21. Both the chassis 50 and the protective plate 60 are made of C-shaped or I-beams welded into a rectangle, and have an external extension edge, that is, a groove protruding from the chassis 50 and the protective plate 60. The extension edge is provided with a limiting hole corresponding to the end of the limiting handle 712. The housing limiter 70 serves both as a limit and fixation for the movable oil tank 20. During the installation of the movable oil tank 20, the cross pressure arm 71 also functions as a lever. With the hinge point of the cross pressure arm 71 and the connecting pile 72 as the fulcrum, the pressure finger 711 end of the cross pressure arm 71 will generate a greater thrust on the movable oil tank 20 than directly pushing the movable oil tank 20, assisting in pushing the movable oil tank 20 completely into the recess 12, which is more labor-saving. The purpose is to prevent the first valve stem 32 and the second valve stem 43 from being pushed arbitrarily. The first spring 36 and the second spring 45 adopt a larger preload to make the first valve stem 32 and the second valve stem 43 move inward synchronously and open the oil passage. In this way, it is very difficult to push the movable oil tank 20 manually. Therefore, the cross pressure arm 71 is used to assist.

[0031] For example, after the movable oil tank 20 is pushed into place, the limit handle 712 is released. Under the action of the internal return spring, the end of the limit handle 712 will pop out and lock into the corresponding limit hole on the edge of the chassis 50 or the protective plate 60. When unlocking, hold the limit handle 712 and slide it away from the limit hole to release the limit of the cross pressure arm 71. Then lift the cross pressure arm 71 to release the restriction on the movable oil tank 20.

[0032] The exemplary implementation of the solution proposed in this disclosure has been described in detail above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the spirit of this disclosure, and various combinations can be made to the various technical features and structures proposed in this disclosure without exceeding the protection scope of this disclosure, which is determined by the appended claims.

Claims

1. A conveniently installed fuel tank device, characterized in that: include: Fixed oil tank (10); The movable oil tank (20) is detachably disposed above the fixed oil tank (10); The docking mechanism includes a first docking part (30) disposed on a fixed oil tank (10) and a second docking part (40) disposed on a movable oil tank (20). When the movable fuel tank (20) is connected to the fixed fuel tank (10), the first docking part (30) and the second docking part (40) are sealed and connected to each other so as to introduce the fuel in the movable fuel tank (20) into the fixed fuel tank (10).

2. The conveniently installed fuel tank device according to claim 1, characterized in that, The first docking part (30) includes a first valve stem (32) and a first elastic member that provides a first preload force, and the second docking part (40) includes a second valve stem (43) and a second elastic member that provides a second preload force; In the non-connected state, the first preload and the second preload respectively drive the first valve stem (32) and the second valve stem (43) to remain closed and sealed; In the docking state, the ends of the first valve stem (32) and the second valve stem (43) abut against each other and move away from each other, together overcoming the first preload and the second preload to open the connecting oil passage.

3. The conveniently installed fuel tank device according to claim 2, characterized in that, The first docking portion (30) further includes a first locking member for limiting unintended movement of the first valve stem (32), and the second docking portion (40) further includes a second locking member for limiting unintended movement of the second valve stem (43); During the pushing and connecting process between the movable oil tank (20) and the fixed oil tank (10), the first locking member and the second locking member are unlocked in sequence, and then the first valve stem (32) and the second valve stem (43) can be pushed.

4. The conveniently installed fuel tank device according to claim 3, characterized in that, The first locking member is a first snap ring (33), which partially engages with the first limiting ring groove (322) of the first valve stem (32); the second locking member is a second snap ring (47), which partially engages with the second limiting ring groove (432) of the second valve stem (43).

5. The conveniently installed fuel tank device according to claim 4, characterized in that, The second docking part (40) also includes a docking outer sleeve (41), the inner wall of which is provided with an annular shoulder (411). During the docking process, the annular shoulder (411) squeezes the first retaining ring (33) to disengage it from the first limiting annular groove (322), while the end of the first docking part (30) squeezes the second retaining ring (47) to disengage it from the second limiting annular groove (432).

6. The conveniently installed fuel tank device according to claim 1, characterized in that, The fixed oil tank (10) has a recess (12) at the top for accommodating and guiding the movable oil tank (20), and a raised guide strip (121) is provided in the recess (12); the movable oil tank (20) has a recessed guide groove (22) at the bottom that cooperates with the raised guide strip (121).

7. The conveniently installed fuel tank device according to claim 6, characterized in that, The fixed oil tank (10) is provided with a limiting protrusion (13), and the movable oil tank (20) is provided with a limiting groove (23) that cooperates with the limiting protrusion (13), which is used to provide vertical limiting when the movable oil tank (20) is pushed into place.

8. The conveniently installed fuel tank device according to claim 1, characterized in that, It also includes a tank limiter (70) for locking the movable tank (20) after it has been pushed into place.

9. A conveniently installed fuel tank device according to claim 8, characterized in that, The housing limiter (70) includes a hinged pressure arm (71), one end of which is provided with a pressure finger (711) for pressing the movable oil tank (20). When the other end of the pressure arm (71) is pressed down, the end of the pressure finger (711) can apply an auxiliary propulsion force to the movable oil tank (20).

10. The conveniently installed fuel tank device according to claim 1, characterized in that, The docking areas of the fixed fuel tank (10) and / or the movable fuel tank (20) are set as inclined surfaces so that the fuel can converge under the action of gravity.

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