Theft-proof oil tank cover with oil level detection structure

Abstract

The application relates to the technical field of oil tank covers, in particular to a theftproof oil tank cover with an oil level detection structure, which comprises an aluminum base, a sealing cover is sealingly inserted into the inner cavity of the aluminum base, a through installation cavity is formed in the bottom of the sealing cover, a lock sleeve is fixedly connected to the inner wall of the installation cavity, a lock cylinder mechanism is connected between the lock sleeve and the inner cavity wall of the aluminum base, the lock cylinder mechanism is used for clamping and locking the lock sleeve and the aluminum base, an oil level detection mechanism is connected to the aluminum base, when the oil tank cover is operated, an operator can clearly judge the oil quantity in the oil tank through the indicating scale on the sealing cover, the oil quantity can be known even if the operator forgets to observe the oil quantity through the instrument panel in the vehicle, the operator does not need to return to the vehicle again, and the indicating scale on the sealing cover can be used to judge the oil quantity after refueling at a gas station, so that the accurate value after refueling can be known in time, and unreasonable doubts about the refueling quantity at the gas station can be avoided.

Description

Technical Field

[0001] This invention relates to the field of fuel tank caps, and more particularly to an anti-theft fuel tank cap with an oil level detection structure. Background Technology

[0002] A fuel tank cap is a box on a car used to store gasoline. It is square in shape, made of stainless steel, and has a good seal. It has only one small, round opening, about the size of a bottle cap, for easy storage. It is usually located at the rear of the car.

[0003] Existing technology discloses some patent documents related to fuel tank caps. Chinese patent application number CN202111411091.4 discloses a fuel tank cap with an anti-theft alarm based on human body recognition. It includes an aluminum base, a plastic cover at the upper end of the aluminum base, a plastic cap installed inside the plastic cover, a threaded plug threaded to the inner side of the aluminum base, and the plastic cap engaging with the threaded plug. A plastic handle is attached to the plastic cover, a miniature camera is mounted on the plastic handle, an alarm is located on one side of the plastic handle, a lock cylinder sleeve is mounted on the plastic cap, a lock cylinder is installed inside the lock cylinder sleeve, and a lock tongue is mounted on the lock cylinder sleeve. The lock tongue is inserted into the lock cylinder sleeve. The miniature camera mounted on the plastic handle facilitates the identification of personnel approaching the fuel tank cap. Successful identification allows the fuel tank cap to be opened; unsuccessful identification triggers the alarm.

[0004] In existing technologies, mechanical methods for detecting fuel level involve inserting a dipstick into the fuel tank and then pulling it out to observe the level reached by the fuel level mark. This method is cumbersome and prone to errors. Sensor-based fuel level detection utilizes the principle of a reed switch controlled by the magnetic field generated by a ferrite magnet. Changes in the measured fuel level are converted into a resistance-voltage signal, which is then connected to a secondary instrument to determine the fuel level. However, in practical applications, it's inconvenient to directly check the fuel level at the tank during refueling. Drivers need to check the level again from the driver's seat, which is inconvenient. It's also difficult to check the fuel level immediately after refueling when closing the fuel cap, making it difficult to know the exact amount refueled and leading to unfounded doubts about the amount refueled at gas stations.

[0005] To address this issue, the present invention proposes an anti-theft fuel tank cover with an oil level detection structure. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing an anti-theft fuel tank cover with an oil level detection structure.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: an anti-theft fuel tank cover with an oil level detection structure, comprising an aluminum base, a sealing cover being sealed and inserted into the inner cavity of the aluminum base, a through mounting cavity being opened at the bottom of the sealing cover, a locking sleeve being fixedly connected to the inner wall of the mounting cavity, a lock cylinder mechanism being connected between the lock sleeve and the inner wall of the aluminum base, the lock cylinder mechanism being used to lock the lock sleeve and the aluminum base, and an insertion limiting mechanism being connected between the sealing cover and the aluminum base;

[0008] An oil level detection mechanism is connected to the aluminum base. The oil level detection mechanism includes a conical funnel, an upper rotating rod, a guide rod, and a first through hole. The conical funnel is fixedly connected to the bottom of the aluminum base. The first through hole is opened through the bottom of the locking sleeve. The upper rotating rod is rotatably connected to the inside of the first through hole. The upper end of the upper rotating rod passes through the sealing cover and extends above it. A pointer is fixedly connected to its rear surface. The upper end of the sealing cover is provided with a scale adapted to the pointer. A lower rotating rod is slidably inserted into the lower end of the upper rotating rod. The lower rotating rod is rotatably installed on the inner side wall of the conical funnel. A spiral groove is opened on the outer surface of the lower rotating rod. A linkage pin is slidably connected to the inner wall of the spiral groove. A float is fixedly connected to the end of the linkage pin. The guide rod is fixedly installed on the inner side wall of the conical funnel. The float is slidably sleeved on the surfaces of the guide rod and the lower rotating rod.

[0009] Preferably, the lock cylinder mechanism includes a lock cylinder body and a slot. The slot is formed on the inner wall of the aluminum base. The lock cylinder body is rotatably connected to the inner wall of the lock sleeve. A keyhole is formed at the upper end of the lock cylinder body. A latch mechanism is connected between the lock sleeve and the lock cylinder body. A turntable is fixedly connected to the lower end of the lock cylinder body. Three fan-shaped chucks arranged in a circumferential array are slidably arranged on the upper end of the turntable. A sliding plate is fixedly connected to the top of the fan-shaped chucks. Three first sliding grooves arranged in a circumferential array are formed on the bottom surface of the lock sleeve. The sliding plate is slidably connected to the interior of an adjacent first sliding groove. A sliding rod is fixedly connected to the lower end face of the fan-shaped chucks. Three arc-shaped grooves arranged in a circumferential array are formed on the upper end face of the turntable. The sliding rod is slidably inserted into the arc-shaped groove. The fan-shaped chucks are slidably inserted into the slot. An arc-shaped through groove is formed on the turntable. The arc-shaped through groove is slidably sleeved on the surface of the upper rotating rod.

[0010] Preferably, the insertion limiting mechanism includes three positioning grooves, which are arranged in a circumferential array on the upper surface of the aluminum base. A positioning pin is slidably inserted into the inside of each positioning groove, and the top of the positioning pin of the sealing cover is fixedly connected to the bottom of the sealing cover.

[0011] Preferably, a connecting cavity is formed at the top of the sealing cover corresponding to the position of the dial. The dial is fixedly connected to the bottom surface of the inner wall of the connecting cavity. The upper rotating rod passes through the connecting cavity. The pointer is located inside the connecting cavity. An adjusting handle is fixedly connected to the top of the upper rotating rod. A transparent cover plate is slidably sleeved on the surface of the upper rotating rod located between the adjusting handle and the pointer. The transparent cover plate is fixedly connected to the top of the inner wall of the connecting cavity.

[0012] Preferably, a bushing is fixedly connected to the lower end of the upper rotating rod, and a spring is provided inside the bushing. One end of the spring is fixedly connected to the bottom surface of the upper rotating rod, and the other end of the spring is fixedly connected to a first slider. A second sliding groove is provided on the inner side wall of the bushing, and the first slider is slidably connected to the second sliding groove. A docking block is fixedly connected to the bottom surface of the first slider, and a docking groove is provided on the upper end surface of the lower rotating rod. The docking block is slidably inserted into the docking groove.

[0013] Preferably, a first magnetic block 12 is fixedly connected to the lower end face of the docking block, and a second magnetic block is fixedly connected to the bottom surface of the docking groove, with the first magnetic block 12 attracted to the second magnetic block.

[0014] Preferably, a mounting base is fixedly connected to the inner wall of the conical funnel, and a crossbeam is fixedly connected to the mounting base. Two mounting holes are opened on the crossbeam. The lower rotating rod is rotatably installed in one of the mounting holes, and the guide rod is fixedly installed in the other mounting hole.

[0015] Preferably, a filter screen cylinder is provided at the lower end of the conical funnel. The filter screen cylinder is fixedly installed on the bottom end of the inner wall of the conical funnel by screws, and the lower rotating rod and the guide rod are inserted through and inserted into the bottom plate of the filter screen cylinder.

[0016] Preferably, the latch mechanism includes three insertion through holes and three connecting holes. The three insertion through holes are linearly arrayed and pass through the inner wall of the keyhole. Three follower pins of different lengths are slidably inserted into the inner walls of the three insertion through holes. The three connecting holes are opened on the inner side wall of the lock sleeve. A push pin is inserted into the inner wall of each of the three connecting holes. The lengths of the three push pins are different. A support spring is fixedly connected between the end of the push pin and the inner wall of the connecting hole. The end of the push pin away from the support spring is slidably inserted into the interior of the insertion through hole and contacts the end of the follower pin.

[0017] Preferably, the upper rotating rod has a second through hole, and a pin is slidably disposed in the second through hole. The lower end of the pin is pressed against the first slider, and the upper end face of the pin is flush with the upper end face of the adjusting handle.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. When operating the fuel tank cap, the operator can clearly determine the amount of fuel in the tank through the indicator scale on the sealing cap. Even if the operator forgets to check the fuel level on the dashboard, they can still know the amount without having to return to the vehicle. Furthermore, after refueling at a gas station, the operator can use the indicator scale on the sealing cap to determine the amount of fuel remaining, so as to obtain the accurate value in a timely manner and avoid unfounded doubts about the amount of fuel dispensed at the gas station.

[0020] 2. By rotating the adjustment handle, the upper rotating rod is rotated until the connection is completed, which allows the operator to adjust and connect the parts in a convenient position, making the operation easier.

[0021] 3. Insert the sealing cap into the aluminum base and position it using the insertion limiting mechanism. During the insertion process, if the upper and lower rotating rods cannot align perfectly, the bushing will fit onto the upper end of the lower rotating rod. The mating block will retract upwards under the push of the upper end of the lower rotating rod, compressing the spring and automatically creating clearance. At this point, the sealing cap is in a stable mating state. Then, manually adjust the adjusting handle until the mating block aligns with the mating groove. Under the return push of the spring, the mating block and the mating groove are inserted, avoiding restrictions on the insertion process of the sealing cap and the aluminum base. This facilitates the adjustment of the mating block and the mating groove in a stable state after the sealing cap and the aluminum base are inserted and sealed, making it convenient for operators to adjust and use. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic cross-sectional view of the sealing cap structure of the present invention;

[0024] Figure 3 This is a cross-sectional schematic diagram of the lower mounting structure of the aluminum base of the present invention;

[0025] Figure 4 for Figure 3 Enlarged schematic diagram of the structure at point A in the middle;

[0026] Figure 5 This is a schematic cross-sectional view of the connection between the upper and lower rotating rods of the present invention;

[0027] Figure 6 This is a schematic diagram of the lock cylinder mechanism of the present invention (the fan-shaped chuck is blown open from the turntable).

[0028] Figure 7 This is a schematic diagram of the installation of the oil level detection mechanism of the present invention;

[0029] Figure 8This is a schematic diagram of the connection between the float and the lower rotating rod of the present invention;

[0030] Figure 9 This is a schematic diagram of the lower rotating rod structure of the present invention;

[0031] Figure 10 For the present invention Figure 2 Schematic diagram of the structure at point B;

[0032] Figure 11 For the present invention Figure 8 Schematic diagram of the cross-section of the structure at point C.

[0033] In the diagram: 1. Aluminum base; 2. Slot; 3. Positioning slot; 4. Conical funnel; 5. Filter screen cylinder; 6. Insertion through hole; 7. Mounting base; 8. Crossbeam; 9. Mounting hole; 10. Lock sleeve; 11. Lock cylinder body; 12. First magnet; 13. Positioning pin; 14. Connecting hole; 15. Keyhole; 16. Turntable; 17. Arc groove; 18. Arc through groove; 19. First slide groove; 20. Fan-shaped chuck; 21. Slide plate; 22. Slide rod; 23. Second magnet; 24. First 25. Through hole; 26. Upper rotating rod; 27. Pointer; 28. Dial; 29. ​​Transparent cover plate; 30. Adjusting handle; 31. Bushing; 32. Spring; 33. First slider; 34. Second slide groove; 35. Connecting block; 36. Connecting groove; 37. Lower rotating rod; 38. Spiral groove; 39. Float; 40. Linkage pin; 41. Guide rod; 42. Second through hole; 43. Ejector pin; 44. Sealing cover; 45. Follower pin; 46. Push pin; 47. Support spring. Detailed Implementation

[0034] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0035] like Figures 1 to 11 The anti-theft fuel tank cover with an oil level detection structure shown includes an aluminum base 1. The aluminum base 1 has a sealing cover 43 inserted into its inner cavity. The bottom of the sealing cover 43 has a through mounting cavity. A locking sleeve 10 is fixedly connected to the inner wall of the mounting cavity. A locking core mechanism is connected between the locking sleeve 10 and the inner wall of the aluminum base 1. The locking core mechanism is used to lock the locking sleeve 10 and the aluminum base 1. An insertion limiting mechanism is connected between the sealing cover 43 and the aluminum base 1.

[0036] An oil level detection mechanism is connected to the aluminum base 1. The oil level detection mechanism includes a conical funnel 4, an upper rotating rod 25, a guide rod 40, and a first through hole 24. The conical funnel 4 is fixedly connected to the bottom of the aluminum base 1. The first through hole 24 is opened through the bottom of the locking sleeve 10. The upper rotating rod 25 is rotatably connected to the inside of the first through hole 24. The upper end of the upper rotating rod 25 passes through the sealing cover 43 and extends above it. A pointer 26 is fixedly connected to its rear surface. The upper end surface of the sealing cover 43 is provided with a corresponding indicator. The dial 27 is adapted to the needle 26. The lower end of the upper rotating rod 25 is slidably inserted with the lower rotating rod 36. The lower rotating rod 36 is rotatably mounted on the inner wall of the conical funnel 4. The outer surface of the lower rotating rod 36 is provided with a spiral groove 37. A linkage pin 39 is slidably connected to the inner wall of the spiral groove 37. A float 38 is fixedly connected to the end of the linkage pin 39. The guide rod 40 is fixedly mounted on the inner wall of the conical funnel 4. The float 38 is slidably sleeved on the surfaces of the guide rod 40 and the lower rotating rod 36.

[0037] However, in practical applications, it's inconvenient to directly check the fuel level at the fuel tank location during refueling. Drivers need to go to the cab to check again, causing inconvenience. Similarly, it's difficult to check the fuel level immediately after refueling when closing the fuel cap, making it hard to know the exact amount refueled and leading to unfounded doubts about the gas station's refueling volume. This invention solves these problems. The specific working method is as follows: After inserting the sealing cap 43 into the inner cavity of the aluminum base 1, insert the key into the lock cylinder mechanism, and turn the key... The lock cylinder mechanism then operates, locking the lock sleeve 10 and the aluminum base 1 together. Without a key, the sealing cover 43 cannot be pulled out of the inner cavity of the aluminum base 1, achieving the purpose of theft prevention. After the sealing cover 43 is locked, the upper rotating rod 25 and the lower rotating rod 36 slide together. The lower rotating rod 36 is inserted into the fuel tank. When fuel in the tank is used, the fuel level drops. Under the gravity of the float 38, the float slides downwards along the guide rod 40 and the lower rotating rod 36. On the lower rotating rod 36, the float 38 slides downwards along the spiral groove 37 using the linkage pin 39. Due to the gravity of the float 38, it slides downwards through the linkage pin 39... The energy is transmitted to the inner wall of the spiral groove 37, causing the lower rotating rod 36 to rotate. Since the lower rotating rod 36 and the upper rotating rod 25 are connected, the upper rotating rod 25 also rotates synchronously with the lower rotating rod 36. The rotation of the upper rotating rod 25 causes the pointer 26 to deflect. When the float 38 is at different heights, the angle of deflection of the upper rotating rod 25 corresponds to different values. These values ​​are then compared with the scale values ​​on the dial 27, which is marked with fuel level markings. The height of the float 38 can be accurately determined by the scale indicated by the pointer 26, which corresponds to the remaining fuel in the tank at that moment. The fuel level is indicated by the scale on pointer 26. As fuel is continuously used, the scale on pointer 26 constantly reflects the fuel level in the tank. Therefore, when operating the fuel tank cap, the operator can clearly determine the amount of fuel in the tank through the scale on the sealing cap 43. Even if the operator forgets to check the fuel level on the dashboard, they can still know the level without having to return to the vehicle. Furthermore, after refueling at a gas station, the operator can use the scale on sealing cap 43 to determine the amount of fuel remaining, ensuring timely and accurate information and avoiding unfounded doubts about the amount of fuel dispensed at the gas station.

[0038] In one embodiment of the present invention, the lock cylinder mechanism includes a lock cylinder body 11 and a slot 2. The slot 2 is formed on the inner wall of the aluminum base 1. The lock cylinder body 11 is rotatably connected to the inner wall of the lock sleeve 10. A keyhole 15 is formed at the upper end of the lock cylinder body 11. A latch mechanism is connected between the lock sleeve 10 and the lock cylinder body. A turntable 16 is fixedly connected to the lower end of the lock cylinder body 11. Three fan-shaped chucks 20 arranged in a circular array are slidably arranged at the upper end of the turntable 16. A sliding plate 21 is fixedly connected to the top of the fan-shaped chucks 20. Three first sliding grooves arranged in a circular array are formed on the bottom surface of the lock sleeve 10. 19. The slide plate 21 is slidably connected inside the first slide groove 19. The lower end face of the fan-shaped chuck 20 is fixedly connected to the slide rod 22. The upper end face of the turntable 16 has three arc-shaped grooves 17 arranged in a circular array. The slide rod 22 is slidably inserted into the arc-shaped groove 17. The fan-shaped chuck 20 is slidably inserted into the groove 2. The turntable 16 has an arc-shaped through groove 18, which is slidably sleeved on the surface of the upper rotating rod 25. During operation, when unlocking the fuel tank cap, the key is inserted into the keyhole 15. The teeth on the key adjust the latch mechanism to a state that does not affect the rotation of the lock cylinder body 11. Then, the lock cylinder body 11 is rotated. The key rotates the lock cylinder body 11 and the turntable 16. The rotation of the turntable 16 causes the slide bar 22 to slide along the arc-shaped groove 17. Due to the sliding connection between the slide plate 21 and the first slide groove 19, the fan-shaped chuck 20 will not rotate in the circumferential direction, but will only retract radially, thus disengaging from the slot 2 and allowing the sealing cover 43 to be removed. When locking the fuel tank cover, the key is turned in the opposite direction, causing the lock cylinder body 11 and the turntable 16 to rotate in the opposite direction, causing the slide bar 22 to slide in the opposite direction along the arc-shaped groove 17. Due to the sliding connection between the slide plate 21 and the first slide groove 19, the fan-shaped chuck 20 will not rotate in the circumferential direction, but will only retract radially, thus disengaging from the slot 2 and allowing the sealing cover 43 to be removed. The sliding connection of the slide groove 19 prevents the sector chuck 20 from rotating circumferentially. Instead, it extends radially. The sector chuck 20 re-engages in the slot 2. When the key is removed, the latch mechanism resumes its function, locking the lock cylinder body 11 and the lock sleeve 10 in place, preventing the lock cylinder body 11 from rotating. This prevents the oil tank cap from being removed, thus achieving the purpose of theft prevention. The turntable 16 has an arc-shaped through groove 18. When the turntable 16 rotates, the upper rotating rod 25 slides within the arc-shaped through groove 18, and the rotation of the turntable 16 does not interfere with the upper rotating rod 25.

[0039] In one embodiment of the present invention, the insertion limiting mechanism includes three positioning grooves 3, which are arranged in a circumferential array on the upper end face of the aluminum base 1. Positioning pins 13 are slidably inserted into the interior of the positioning grooves 3, and the top of the positioning pins 13 of the sealing cover 43 is fixedly connected to the bottom of the sealing cover 43. During operation, the positioning pins 13 correspond one-to-one with the positioning grooves 3. After the positioning pins 13 are inserted into the positioning grooves 3, the sealing cover 43 can be prevented from rotating axially, thereby indirectly limiting the position of the upper rotating rod 25 and the lower rotating rod 36.

[0040] In one embodiment of the present invention, a connecting cavity is provided at the top of the sealing cover 43 corresponding to the position of the dial 27. The dial 27 is fixedly connected to the bottom surface of the inner wall of the connecting cavity. The upper rotating rod 25 passes through the connecting cavity, and the pointer 26 is located inside the connecting cavity. An adjusting handle 29 is fixedly connected to the top of the upper rotating rod 25. A transparent cover plate 28 is slidably sleeved on the surface of the upper rotating rod 25 located between the adjusting handle 29 and the pointer 26. The transparent cover plate 28 is fixedly connected to the top of the inner wall of the connecting cavity. During operation, when the sealing cover 43 needs to be opened, the upper rotating rod 25 and the lower rotating rod 36 can be disengaged. When resealing and connecting, the upper rotating rod 25 and the lower rotating rod 36 will be inserted again. Since the upper rotating rod 25 and the lower rotating rod 36 cannot be guaranteed to be in the exact docking position when they are docked, adjustment is required. This embodiment of the present invention can solve the above problems. The specific working method is as follows: by rotating the adjusting handle 29, the upper rotating rod 25 is rotated until the docking is completed, which makes it convenient for the operator to adjust and dock in a convenient position, thus facilitating operation.

[0041] In one embodiment of the present invention, a bushing 30 is fixedly connected to the lower end of the upper rotating rod 25. A spring 31 is provided inside the bushing 30. One end of the spring 31 is fixedly connected to the bottom surface of the upper rotating rod 25, and the other end of the spring 31 is fixedly connected to a first slider 32. A second sliding groove 33 is provided on the inner side wall of the bushing 30. The first slider 32 is slidably connected to the second sliding groove 33. A docking block 34 is fixedly connected to the bottom surface of the first slider 32. A docking groove 35 is provided on the upper end surface of the lower rotating rod 36, and the docking block 34 is slidably inserted into the docking groove 35. During operation, if the upper rotating rod 25 and the lower rotating rod 36 cannot be properly docked during the docking process, the sealing cover 43 will be blocked and cannot continue to be sealed with the aluminum base 1. The operator needs to hold and adjust the state of the sealing cover 43 with one hand for alignment and adjustment, which is relatively troublesome. This embodiment of the present invention can solve the above-mentioned technical problems. The method is as follows: the sealing cover 43 can be inserted into the aluminum base 1 and positioned by the insertion limiting mechanism. During the process of the sealing cover 43 being inserted into the aluminum base 1, if the upper rotating rod 25 and the lower rotating rod 36 cannot be properly aligned, the bushing 30 will be fitted onto the upper end of the lower rotating rod 36, and the mating block 34 will retract upward under the pushing action of the upper end of the lower rotating rod 36, compressing the spring 31 and automatically creating a clearance. At this time, the sealing cover 43 is in a stable mating state. Then, the adjusting handle 29 can be manually rotated until the mating block 34 and the mating groove 35 are aligned. Under the reset pushing action of the spring 31, the mating block 34 and the mating groove 35 are inserted, avoiding the restriction on the insertion process of the sealing cover 43 and the aluminum base 1. This facilitates the adjustment of the mating of the mating block 34 and the mating groove 35 in a stable state after the sealing cover 43 and the aluminum base 1 are inserted and sealed, making it convenient for operators to adjust and operate, and convenient to use.

[0042] In one embodiment of the present invention, a first magnetic block 12 is fixedly connected to the lower end face of the docking block 34, and a second magnetic block 23 is fixedly connected to the bottom surface of the docking groove 35. The first magnetic block 12 is attracted to the second magnetic block 23. During operation, when the docking block 34 and the docking groove 35 are aligned, the first magnetic block 12 and the second magnetic block 23 will generate mutual attraction. In addition, the spring 31 will reset and push, which will accelerate the insertion speed and facilitate rapid insertion when docking.

[0043] In one embodiment of the present invention, a mounting base 7 is fixedly connected to the inner wall of the conical funnel 4, and a crossbeam 8 is fixedly connected to the mounting base 7. Two mounting holes 9 are opened on the crossbeam 8. The lower rotating rod 36 is rotatably installed in one of the mounting holes 9, and the guide rod 40 is fixedly installed in the other mounting hole 9. During operation, the lower rotating rod 36 and the guide rod 40 can be installed and supported by setting the mounting base 7 and the crossbeam 8.

[0044] In one embodiment of the present invention, a filter screen cylinder 5 is provided at the lower end of the conical funnel 4. The filter screen cylinder 5 is fixedly installed at the bottom of the inner wall of the conical funnel 4 by screws. The lower rotating rod 36 and the guide rod 40 are inserted through and inserted into the bottom plate of the filter screen cylinder 5. During operation, the filter screen cylinder 5 is fixedly installed at the bottom of the inner wall of the conical funnel 4 by screws. When adding oil, the oil can be filtered and floating objects in the outside air can be prevented from falling in.

[0045] In one embodiment of the present invention, the latch mechanism includes three insertion through holes 6 and three connecting holes 14. The three insertion through holes 6 are linearly arrayed and pass through the inner wall of the keyhole 15. Three follower pins 44 of different lengths are slidably inserted into the inner wall of the three insertion through holes 6. The three connecting holes 14 are opened on the inner side wall of the lock sleeve 10. A push pin 45 is inserted into the inner wall of each of the three connecting holes 14. The lengths of the three push pins 45 are different. A support spring 46 is fixedly connected between the end of the push pin 45 and the inner wall of the connecting hole 14. The end of the push pin 45 away from the support spring 46 is slidably inserted into the inside of the insertion through hole 6 and is connected to the end of the follower pin 44. The parts are in contact with each other; during operation, when a suitable key is inserted into the keyhole 15, it will push the follower pin 44, which will push the push pin 45 out of the insertion hole 6. At this time, the connection between the push pin 45 and the insertion hole 6 is canceled, and the locking sleeve 10 and the lock cylinder body 11 are also canceled. Then the lock cylinder body 11 can be rotated by the key, indirectly adjusting the locking between the sector chuck 20 and the slot 2, thus canceling the sealing cover 43. When the sealing cover 43 needs to be locked, the lock cylinder body 11 is rotated to the initial position and the key is pulled out. Under the action of the support spring 46, the push pin 45 will continue to be inserted into the insertion hole 6, continuing to be locked, thus playing an anti-theft role.

[0046] In one embodiment of the present invention, a second through hole 41 is provided in the upper rotating rod 25, and a push pin 42 is slidably disposed in the second through hole 41. The lower end of the push pin 42 presses against the first slider 32, and the upper end face of the push pin 42 is flush with the upper end face of the adjusting handle 29. During operation, it is inconvenient to judge the docking status between the internal lower rotating rod 36 and the upper rotating rod 25 during docking. This embodiment of the present invention can solve the above-mentioned problem. When the upper rotating rod 25 and the lower rotating rod 36 are not successfully docked, the bushing 30 will be sleeved on the upper end of the lower rotating rod 36, and docking will be achieved. The upper part of the lower rotating rod 36 will push the upper part of the docking block 34 upward and compress the spring 31. The docking block 34 will push the ejector pin 42 upward a certain distance, and the top of the ejector pin 42 will protrude the adjustment handle 29, providing the operator with a basis for judgment. When docking is completed, the docking block 34 will slide into the docking groove 35, and the docking block 34 will stop pushing the ejector pin 42. The top of the ejector pin 42 will retract into the adjustment handle 29, which will help the operator to quickly judge the docking status of the upper rotating rod 25 and the lower rotating rod 36.

[0047] Working principle of this invention:

[0048] After inserting the sealing cap 43 into the inner cavity of the aluminum base 1, insert the key into the lock cylinder mechanism. After turning the key, the lock cylinder mechanism works accordingly, locking the lock sleeve 10 and the aluminum base 1. At this time, without the key, the sealing cap 43 cannot be pulled out from the inner cavity of the aluminum base 1, thus achieving the purpose of anti-theft. After the sealing cap 43 is locked, the upper rotating rod 25 and the lower rotating rod 36 are slidably inserted together. The lower rotating rod 36 is inserted into the fuel tank. When the fuel in the fuel tank is used, the fuel level drops. Under the gravity of the float 38, the float slides down along the guide rod 40 and the lower rotating rod 36. On the lower rotating rod 36, the float 38 slides down along the spiral groove 37 by the linkage pin 39. Since the gravity of the float 38 is transmitted to the spiral groove through the linkage pin 39, the float 38 slides down the spiral groove. On the inner wall of 37, the lower rotating rod 36 rotates. At this time, the lower rotating rod 36 and the upper rotating rod 25 are connected, so the upper rotating rod 25 also rotates synchronously with the lower rotating rod 36. The rotation of the upper rotating rod 25 causes the pointer 26 to deflect. When the float 38 is at different heights, the angle of deflection of the upper rotating rod 25 is also different. This is then matched one-to-one with the scale value on the dial 27. The dial 27 is engraved with oil level scale. The height of the float 38 can be accurately determined by the scale indicated by the pointer 26. The scale indicated by the pointer 26 corresponds to the oil level height of the remaining fuel in the tank at this time. When the fuel is continuously used, the scale indicated by the pointer 26 reflects the oil level height in the tank at all times.

[0049] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. An anti-theft fuel tank cover with an oil level detection structure, comprising an aluminum base (1), characterized in that, A sealing cover (43) is inserted into the inner cavity of the aluminum base (1). A through mounting cavity is opened at the bottom of the sealing cover (43). A locking sleeve (10) is fixedly connected to the inner wall of the mounting cavity. A locking core mechanism is connected between the locking sleeve (10) and the inner wall of the aluminum base (1). The locking core mechanism is used to lock the locking sleeve (10) and the aluminum base (1). An insertion limiting mechanism is connected between the sealing cover (43) and the aluminum base (1). An oil level detection mechanism is connected to the aluminum base (1). The oil level detection mechanism includes a conical funnel (4), an upper rotating rod (25), a guide rod (40), and a first through hole (24). The conical funnel (4) is fixedly connected to the bottom of the aluminum base (1). The first through hole (24) is opened through the bottom of the lock sleeve (10). The upper rotating rod (25) is rotatably connected to the inside of the first through hole (24). The upper end of the upper rotating rod (25) passes through the sealing cover (43) and extends above it. A pointer (26) is fixedly connected to its rear surface. The upper end surface of the sealing cover (43) is provided with a part that corresponds to the pointer (26). 26) A matching dial (27) is provided. The lower end of the upper rotating rod (25) is slidably inserted with a lower rotating rod (36). The lower rotating rod (36) is rotatably mounted on the inner wall of the conical funnel (4). A spiral groove (37) is provided on the outer surface of the lower rotating rod (36). A linkage pin (39) is slidably connected on the inner wall of the spiral groove (37). A float (38) is fixedly connected to the end of the linkage pin (39). The guide rod (40) is fixedly mounted on the inner wall of the conical funnel (4). The float (38) is slidably sleeved on the surfaces of the guide rod (40) and the lower rotating rod (36). The lower end of the upper rotating rod (25) is fixedly connected to a bushing (30), and a spring (31) is provided inside the bushing (30). One end of the spring (31) is fixedly connected to the bottom surface of the upper rotating rod (25), and the other end of the spring (31) is fixedly connected to a first slider (32). A second sliding groove (33) is provided on the inner side wall of the bushing (30). The side of the first slider (32) is slidably connected to the second sliding groove (33). A docking block (34) is fixedly connected to the bottom surface of the first slider (32). A docking groove (35) is provided on the upper end surface of the lower rotating rod (36), and the docking block (34) is slidably inserted into the inside of the docking groove (35).

2. The anti-theft fuel tank cover with an oil level detection structure according to claim 1, characterized in that, The lock cylinder mechanism includes a lock cylinder body (11) and a slot (2). The slot (2) is formed on the inner wall of the aluminum base (1). The lock cylinder body (11) is rotatably connected to the inner wall of the lock sleeve (10). A keyhole (15) is provided at the upper end of the lock cylinder body (11). A latch mechanism is connected between the lock sleeve (10) and the lock cylinder body. A turntable (16) is fixedly connected to the lower end of the lock cylinder body (11). Three fan-shaped chucks (20) arranged in a circular array are slidably arranged at the upper end of the turntable (16). A sliding plate (21) is fixedly connected to the top of the fan-shaped chucks (20). The lock sleeve (11) The bottom surface of 10) has three first sliding grooves (19) arranged in a circular array. The sliding plate (21) is slidably connected to the inside of the adjacent first sliding grooves (19). The lower end face of the fan-shaped chuck (20) is fixedly connected to a sliding rod (22). The upper end face of the turntable (16) has three arc-shaped grooves (17) arranged in a circular array. The sliding rod (22) is slidably inserted into the arc-shaped groove (17). The fan-shaped chuck (20) is slidably inserted into the slot (2). The turntable (16) has an arc-shaped through groove (18). The arc-shaped through groove (18) is slidably sleeved on the surface of the upper rotating rod (25).

3. The anti-theft fuel tank cover with an oil level detection structure according to claim 1, characterized in that, The insertion limiting mechanism includes three positioning grooves (3), which are arranged in a circumferential array on the upper surface of the aluminum base (1). A positioning pin (13) is slidably inserted into the inside of the positioning groove (3), and the top of the positioning pin (13) of the sealing cover (43) is fixedly connected to the bottom of the sealing cover (43).

4. The anti-theft fuel tank cover with an oil level detection structure according to claim 3, characterized in that, A connecting cavity is provided at the top of the sealing cover (43) corresponding to the position of the dial (27). The dial (27) is fixedly connected to the bottom surface of the inner wall of the connecting cavity. The upper rotating rod (25) passes through the connecting cavity. The pointer (26) is located inside the connecting cavity. An adjusting handle (29) is fixedly connected to the top of the upper rotating rod (25). A transparent cover plate (28) is slidably sleeved on the surface of the upper rotating rod (25) located between the adjusting handle (29) and the pointer (26). The transparent cover plate (28) is fixedly connected to the top of the inner wall of the connecting cavity.

5. The anti-theft fuel tank cover with an oil level detection structure according to claim 1, characterized in that, The lower end face of the docking block (34) is fixedly connected to a first magnetic block (12), and the bottom surface of the docking groove (35) is fixedly connected to a second magnetic block (23). The first magnetic block (12) is attracted to the second magnetic block (23).

6. The anti-theft fuel tank cover with an oil level detection structure according to claim 1, characterized in that, A mounting base (7) is fixedly connected to the inner wall of the conical funnel (4), and a crossbeam (8) is fixedly connected to the mounting base (7). Two mounting holes (9) are opened on the crossbeam (8). The lower rotating rod (36) is rotatably installed in one of the mounting holes (9), and the guide rod (40) is fixedly installed in the other mounting hole (9).

7. The anti-theft fuel tank cover with an oil level detection structure according to claim 6, characterized in that, The lower end of the conical funnel (4) is provided with a filter cylinder (5), which is fixedly installed on the bottom of the inner wall of the conical funnel (4) by screws. The lower rotating rod (36) and the guide rod (40) are inserted through the bottom plate of the filter cylinder (5).

8. The anti-theft fuel tank cover with an oil level detection structure according to claim 2, characterized in that, The locking tongue mechanism includes three insertion through holes (6) and three connecting holes (14). The three insertion through holes (6) are linearly arrayed and pass through the inner wall of the keyhole (15). Three follower pins (44) of different lengths are slidably inserted into the inner wall of the three insertion through holes (6). The three connecting holes (14) are opened on the inner side wall of the lock sleeve (10). A top moving pin (45) is inserted into the inner wall of each of the three connecting holes (14). The lengths of the three top moving pins (45) are different. A support spring (46) is fixedly connected between the end of the top moving pin (45) and the inner wall of the connecting hole (14). The end of the top moving pin (45) away from the support spring (46) is slidably inserted into the inside of the insertion through hole (6) and in contact with the end of the follower pin (44).

9. The anti-theft fuel tank cover with an oil level detection structure according to claim 1, characterized in that, The upper rotating rod (25) has a second through hole (41) and a push pin (42) is slidably disposed in the second through hole (41). The lower end of the push pin (42) is pressed against the first slider (32), and the upper end face of the push pin (42) is flush with the upper end face of the adjusting handle (29).

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