Sealing device and automated testing equipment for motorcycle fuel tank air tightness testing

Abstract

The present application belongs to the technical field of air tightness detection, and specifically provides a sealing device for air tightness detection of a motorcycle fuel tank, comprising a first linear drive member, a second linear drive member, a mounting shaft and a third linear drive member which are connected in sequence vertically from top to bottom, the second linear drive member and the outer coaxial sleeve of the mounting shaft are provided with a ring sleeve, the upper end of the ring sleeve is fixed to the lower end of the first linear drive member, and a coaxial sealing ring is fixed to the lower end surface of the ring sleeve; the upper end of the third linear drive member is fixed to the mounting shaft, and the lower end is fixed to the mounting plate through a horizontal connecting plate, two motors with output shafts facing vertically downward are fixed to the mounting plate, two arc rods are provided below the mounting plate, one end of the arc rod is fixed to the output shaft, the motor can drive the arc rod to rotate, and the other end of the arc rod is fixed with a vertically upward push rod, the present invention also provides an automatic air tightness detection device for a motorcycle fuel tank, which utilizes the above-mentioned sealing device for air tightness detection of a motorcycle fuel tank.

Description

Technical Field

[0001] The present application belongs to the technical field of air tightness detection, and specifically provides a sealing device and an automated detection device for air tightness detection of a motorcycle fuel tank. Background Art

[0002] The shell of the motorcycle fuel tank is formed by stamping and then welded with other peripheral structures. A through hole is set on the upper end surface, and an oil filling ring is passed through the through hole. The oil filling ring is fixed at the through hole to form a refueling port. Among them, the fixing methods of the oil filling ring and the through hole include welding, bolt connection and other methods.

[0003] In a technical solution known to the inventor, the oil filling ring adopts a plastic structure, which cannot be fixed by welding. The plastic oil filling ring is fixed at the oil filling port position by interference fit and strong adhesive.

[0004] The related technical scheme involves an automated device for detecting the air tightness of a motorcycle fuel tank using gas. In the device, the fuel filler port sealing mechanism is not directly pressed on the fuel filler port of the fuel tank, but uses a rotating clamping cylinder to extend a tension and pressure column into the fuel filler port, which is rotated inside the fuel filler port and pulled upward by a protrusion so that the upper fuel filler port sealing head contacts and seals the fuel filler port, forming an automatic sealing structure that is locally stressed at the fuel filler port. The fuel tank is not subject to external pressure, thereby avoiding deformation caused by squeezing the fuel tank.

[0005] The inventor believes that in the above technical solution, the protrusion at the tension and pressure column will press upward on the oil filling ring, and the oil filling port sealing mechanism will press on the shell of the oil tank. Figure 1 , 2 As shown, when the oil filling ring and the oil tank through hole are fixed by interference fit and gluing, if an air tightness test is carried out in advance for production and processing efficiency, the strong adhesive may not be completely fixed, and the tension and compression column will cause the oil filling ring to move upward relative to the through hole, and the oil filling ring and the oil tank shell will be separated from the interference fit, destroying the fixed state of the two.

[0006] In addition, the oil filling ring of some motorcycle fuel tanks does not have symmetrical notches at the oil filling port, resulting in the tension and compression column with the protrusion being unable to extend into the fuel tank from the oil filling port of the oil filling ring. Summary of the invention

[0007] The object of the present invention is to provide a sealing device and an automated testing device for detecting air tightness of a motorcycle fuel tank, so as to solve at least one of the above-mentioned technical problems.

[0008] In order to solve the above problems in the prior art, in the first aspect, the present application provides a sealing device for detecting the air tightness of a motorcycle oil tank, comprising a first linear drive, a second linear drive, a mounting shaft, a ring sleeve and a third linear drive. The lower ends of the first linear drive, the second drive and the third drive can be lifted and lowered vertically respectively; the second linear drive is coaxially fixed to the lower end of the first linear drive, the mounting shaft is coaxially fixed to the lower end of the second linear drive, the ring sleeve is coaxially sleeved on the outside of the second linear drive and the mounting shaft, the upper end of the ring sleeve is fixed to the lower end of the first linear drive, and a coaxial sealing ring is fixed to the lower end surface of the ring sleeve.

[0009] The upper end of the third linear drive component is fixed to the mounting shaft, and the lower end is fixed to the mounting plate through a horizontal connecting plate. Two motors with output shafts facing vertically downward are fixed to the mounting plate. Two arc rods are provided under the mounting plate. One end of the arc rod is fixed to the output shaft, and the other end is fixed with a vertically upward push rod. The motor can drive the arc rod to rotate so that the push rod can switch its position between close to the mounting shaft and away from the mounting shaft.

[0010] In a second aspect, the present application provides an automated air tightness detection device for a motorcycle fuel tank, which utilizes the above-mentioned sealing device for air tightness detection of a motorcycle fuel tank.

[0011] Beneficial effects of one or more of the above technical solutions:

[0012] In the present application, a first linear drive member is used to drive the ring sleeve to move downward and allow the sealing ring to fit the annular surface of the shell at the fuel filler port. Utilizing a combination of a second linear drive member and a third linear drive member, after the sealing ring fits the annular surface of the shell at the fuel filler port, the push rod can still move relative to the vertical direction, thereby allowing the push rod and the arc rod portion to pass through the oil filling ring and be completely placed in the inner cavity of the fuel tank, thereby preventing the oil filling ring from affecting the arc rod and driving the push rod to expand away from the mounting shaft, or tightening it on the side of the mounting shaft.

[0013] The combination of the second linear drive member and the third linear drive member enables the upper end of the push rod to press upward against the inner wall of the housing around the oil filling ring, thereby achieving sealing between the sealing ring and the outer wall of the housing around the oil filling ring. That is, the sealing structure presses against the housing both inside and outside, and will not cause misalignment between the housing and the oil filling ring.

[0014] In the present application, the arc rod and the push rod are driven by a motor to move, and can be inserted into the oil filling ring regardless of whether there are symmetrical notches at the oil filling ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Some embodiments of the present application are described below with reference to the accompanying drawings, in which:

[0016] Figure 1 It is a schematic diagram of installing an oil filling ring at the oil filling port of a motorcycle tank in a related technical solution;

[0017] Figure 2 yes Figure 1 A schematic diagram of the structure enlargement of the C part;

[0018] Figure 3 is a schematic diagram of the overall structure of the sealing device in an embodiment of the present invention;

[0019] Figure 4 is a schematic structural diagram of a sealing plug assembly in an embodiment of the present invention;

[0020] Figure 5 is a schematic diagram of an embodiment of the present invention when the sealing device is inserted into the oil filling ring and the ejector pin is not deployed;

[0021] Figure 6 yes Figure 5 A schematic diagram of the structure of part A in the middle;

[0022] Figure 7 is a schematic diagram of the sealing device in the embodiment of the present invention after the push rod is pressed against the inner wall of the oil tank;

[0023] Figure 8 yes Figure 7 A schematic diagram of the structure of part B in the middle;

[0024] Fig. 9 It is a schematic diagram of the two arc-shaped rods and the top rod rotating to a closed state in the embodiment of the present invention;

[0025] Fig.10 It is a schematic diagram of the two arc-shaped rods and the top rod rotating to the unfolded state in the embodiment of the present invention;

[0026] Fig.11 It is a partial structural schematic diagram of a motorcycle fuel tank airtightness automatic detection device in an embodiment of the present invention.

[0027] List of reference numerals: 1. first piston rod; 2. sleeve; 3. second hydraulic cylinder; 4. air pipe; 6. sealing ring; 7. second piston rod; 8. sealing plug assembly; 10. second shaft section; 11. third hydraulic cylinder; 1101. third piston rod; 1102. horizontal connecting plate; 1103. mounting groove; 12. mounting plate; 13. motor; 14. arc rod; 15. push rod; 16. pressure block; 17. first shaft section; 18. spring; 19. shoulder; 20. airway; 22. oil filling channel; 23. annular surface; 24. oil filling ring; 25. workbench; 26. limit column; 27. support leg; 28. crossbeam; 801. second annular plug; 802. support ring; 803. third annular plug; 804. first annular plug; 2401. conical section; 2402. straight section. DETAILED DESCRIPTION

[0028] It should be understood by those skilled in the art that the embodiments described below are only preferred embodiments of the present application, and do not mean that the present application can only be implemented through the preferred embodiments. The preferred embodiments are only used to explain the technical principles of the present application, and are not used to limit the protection scope of the present application. Based on the preferred embodiments provided by the present application, all other embodiments obtained by ordinary technicians in this field without creative work should still fall within the protection scope of the present application.

[0029] It should be noted that, in the description of this application, the terms "center", "upper", "lower", "top", "bottom", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are merely for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0030] In addition, it should be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0031] like Figure 1 , Figure 2 As shown, in some structural forms of motorcycle oil tanks, a through hole is provided at the upper end thereof, and an oil filling ring 24 is inserted at the through hole, and an oil filling channel 22 is formed inside the oil filling ring 24. The oil filling ring 24 is fixed at the through hole by interference fit and a strong adhesive. For example, the size of the lower end of the oil filling ring 24 is slightly smaller than the size of the upper end thereof, and in the process of inserting the oil filling ring 24 into the through hole, the interference fit between the oil filling ring 24 and the through hole is gradually achieved. In order to prevent the oil filling ring 24 from being completely inserted into the through hole and leaking into the inner cavity of the oil tank, an annular protrusion can also be provided at the upper end of the oil filling ring 24.

[0032] The oil filling ring 24 targeted in the present application includes an inwardly folded guide portion, which includes a tapered section 2401 and a straight section 2402 below the tapered section 2401, wherein the upper end opening size of the tapered section 2401 is larger than the lower end opening size thereof.

[0033] It can be seen that when the oil filling ring 24 is fixed to the through hole at the upper end of the oil tank by interference fit, if the upper end of the sealing structure is close to the shell and its lower end presses the oil filling ring 24 upward, the shell and the oil filling ring 24 may move relative to each other in the vertical direction, thereby causing dislocation.

[0034] Of course, after the strong adhesive is completely bonded and fixed, the probability of misalignment between the two can be effectively reduced. However, in actual production, in order to improve factory efficiency, airtightness testing may be performed before the strong adhesive is completely bonded.

[0035] In order to solve the above problems, Figure 3-Figure 10 As shown, this embodiment provides a sealing device for detecting air tightness of a motorcycle oil tank, comprising a first linear drive, a second linear drive, a mounting shaft, a ring sleeve 2 and a third linear drive. The lower ends of the first linear drive, the second drive and the third drive can be lifted and lowered vertically respectively; the second linear drive is coaxially fixed to the lower end of the first linear drive, the mounting shaft is coaxially fixed to the lower end of the second linear drive, the ring sleeve 2 is coaxially sleeved outside the second linear drive and the mounting shaft, the upper end of the ring sleeve 2 is fixed to the lower end of the first linear drive, and a coaxial sealing ring 6 is fixed to the lower end surface of the ring sleeve 2.

[0036] The upper end of the third linear drive component is fixed to the mounting shaft, and the lower end is fixed to the mounting plate 12. A motor 13 with two output shafts facing vertically downward is fixed to the mounting plate 12. Two arc rods 14 are provided below the mounting plate 12. One end of the arc rod 14 is fixed to the output shaft, and the other end is fixed with a vertically upward push rod 15. The motor 13 can drive the arc rod 14 to rotate so that the push rod 15 can switch its position between close to the mounting shaft and away from the mounting shaft.

[0037] In this embodiment, the first linear drive, the second linear drive and the third drive can be hydraulic cylinders arranged vertically, namely the first hydraulic cylinder, the second hydraulic cylinder 3 and the third hydraulic cylinder 11. Specifically, the first piston rod 1 of the first hydraulic cylinder extends vertically downward, the cylinder body of the second hydraulic cylinder 3 is coaxially fixed with the first piston rod 1, and the lower end of the second piston rod 7 of the second hydraulic cylinder 3 is coaxially fixed with the mounting shaft. The mounting shaft is coaxially fixed with the cylinder body of the third hydraulic cylinder 11, the third piston rod 1101 of the third hydraulic cylinder 11 is fixed with the horizontal connecting plate 1102, and the horizontal connecting plate 1102 is fixed with the mounting plate 12.

[0038] In some other embodiments, the first linear driving member, the second linear driving member and the third linear driving member may be linear driving members such as cylinders or electric push rods, as long as they can meet the use requirements of inserting the oil filling ring 24.

[0039] In this embodiment, the ring sleeve 2 can be a structure with constant upper and lower diameters, or it can be Figure 3The lower end shown in the figure has a structure of a shaft diameter reduction section. At this time, the pressing force of the ring sleeve 2 on the housing is completely pressed against the sealing ring 6 by the shaft diameter reduction section.

[0040] In this embodiment, the sealing ring 6 is an elastic structure and can be made of existing materials such as asbestos or rubber.

[0041] In this embodiment, the outer sleeve of the mounting shaft is provided with a sealing plug assembly 8, which can realize the sealing between the inner side of the oil filling ring 24 and the mounting shaft; the mounting shaft is provided with an air duct 20, one end of the air duct 20 passes through the side of the mounting shaft and is connected with one end of the air pipe 4, the other end of the air pipe 4 passes through the ring sleeve 2 and is connected with the differential pressure airtight leak detector, the other end of the air duct 20 passes through the lower end surface of the mounting shaft, and the inner side surface of the ring sleeve 2 is provided with a first gas pressure sensor.

[0042] It is understandable that after the sealing plug assembly 8 is sleeved on the outside of the mounting shaft, the internal space of the oil tank is relatively isolated from the external environment and is only connected to the differential pressure airtight leak detector through the airway 20 and the air pipe 4. When the sealing plug assembly 8 is effective, when the differential pressure airtight leak detector supplies air to the inner cavity of the oil tank, the gas will not enter the inner cavity of the ring sleeve 2 from the inner hole of the oil filling ring 24. When the first gas pressure sensor in the inner cavity of the ring sleeve 2 detects an increase in gas pressure, it can be determined that the interference fit between the oil filling ring 24 and the through hole cannot achieve complete sealing at this time. The pressure change value measured by the first gas pressure sensor can be used to characterize the tightness of the sealing performance between the outer side of the oil filling ring 24 and the through hole, and then determine whether it is necessary to improve the sealing at this point through further gluing.

[0043] The sealing plug assembly 8 has various structural forms, for example, it can be a rubber plug of a cylindrical structure, the outer circular side surface of which fits with the inner circular side surface of the straight cylindrical section 2402 of the oil filling ring 24.

[0044] In this embodiment, the sealing plug assembly 8 includes a first annular plug 804 slidably mounted on the outside of the mounting shaft and a second annular plug 801 fixedly mounted on the outside of the mounting shaft. The lower part of the inner hole in the first annular plug 804 is a conical hole, and the second annular plug 801 is a frustum. The second annular plug 801 can be inserted into the first annular plug 804 to achieve sealing between the two. The outside of the mounting shaft has a shoulder 19, and the shoulder 19 is located on the upper part of the first annular plug 804. There is a spring 18 between the shoulder 19 and the first annular plug 804, and the spring 18 is mounted on the outside of the mounting shaft.

[0045] At this time, the outer wall surface of the first annular plug 804 can fit the inner circular side surface of the tapered section 2401 and the straight section 2402 in the oil filling ring 24. In the process of the second linear drive member and the third linear drive member driving the push rod 15 to move downward, in order to prevent the first annular plug 804 from being limited by the tapered section 2401 of the oil filling ring 24 and affecting the downward movement of the second linear drive member, the first annular plug 804 is set to be slidably connected with the second linear drive member, but this will reduce the sealing effect at the contact surface between the second linear drive member and the first annular plug 804. In order to solve this problem, the second annular plug 801 fixedly connected to the second linear drive member is used in this embodiment, and the inner wall surface of the second annular plug 801 is fixed and sealed with the outer wall surface of the second linear drive member.

[0046] In addition, in order to achieve sealing between the first annular plug 804 and the second annular plug 801, the lower part of the inner hole of the first annular plug 804 is a conical hole, and the second annular plug 801 is a frustum. In this case, the first annular plug 804 and the second annular plug 801 are crimped on an inclined surface, thereby achieving sealing between the two.

[0047] In order to determine whether the sealing of the first annular plug 804 and the second annular plug 801 fails, in this embodiment, a third annular plug 803 is provided above the first annular plug 804, and the two are connected by a support ring 802; a second gas pressure sensor is provided in the gap between the first annular plug 804 and the third annular plug 803.

[0048] from Figure 4 It can be seen that the third annular plug 803, the first annular plug 804 and the second annular plug 801 are coaxial and arranged in order from top to bottom. The inner holes of the first annular plug 804, the second annular plug 801 and the third annular plug 803 are all circular holes for fitting the outer circular side surface of the mounting shaft.

[0049] In this embodiment, the installation shaft is a stepped shaft having two shaft sections (i.e., the second shaft section 10 and the first shaft section 17 shown in the figure), and the outer diameter of each shaft section gradually decreases in the direction away from the first linear drive member, and the push rod 15 can be tightened at the outer circular side surface of the lower half of the shaft section, and the second annular plug 801 is fixed at the outer circular side surface of the upper end shaft section. This can minimize the size of the push rod 15 after tightening the side surface of the installation shaft, so as to avoid the push rod 15 still blocking the installation shaft from entering and exiting relative to the oil injection ring 24 after tightening the side surface of the installation shaft.

[0050] In this embodiment, an elastic pressing block 16 is fixed to the upper end of the push rod 15. The elastic pressing block 16 disperses the pressing force of the push rod 15 on the inner wall of the fuel tank shell, so that the force is more uniform, avoiding deformation of the fuel tank shell caused by excessive local force.

[0051] In this embodiment, the lower end edge of the mounting shaft has a vertical mounting groove 1103, in which one end of the third linear drive member is fixed. The mounting groove here can be a square groove or a circular groove, as long as one end of the third linear drive member can be nested into the mounting groove, which can reduce the vertical length of the entire sealing device as much as possible while satisfying the vertical lifting length of the top rod 15. Fig. 9 and 10 As shown, the horizontal connecting plate allows the mounting groove and the mounting plate to be misaligned in the horizontal direction, making it easier for the arc rod to rotate to meet the position requirements.

[0052] In this embodiment, the arc rod 14 is a semicircular rod. A square plate is fixed to one end of the arc rod 14, and the square plate is coaxially fixed to the output shaft of the motor 13.

[0053] Working principle: When using this device, in the initial state, the first linear drive member, the second linear drive member and the third linear drive member are all retracted to the maximum state. At this time, the top rod 15 and the arc rod 14 are close to the outer circular side surface of the installation shaft through the rotation of the motor 13.

[0054] After the oil tank moves to the set position below the sealing device, the first linear drive member drives the entire sealing device down, and makes the sealing ring 6 at the lower end of the ring sleeve 2 just fit the annular surface 23 of the shell outside the oil filling port, and the sealing ring 6 does not apply pressure to the shell.

[0055] Then the second linear drive member extends downward, and moves until the first annular plug 804 and the third annular plug 803 contact the conical section 2401 at the oil filling ring 24, and the third annular plug 803 and the first annular plug 804 are blocked in the conical section 2401; the lower end of the second linear drive member continues to move downward to the maximum extension length, so that the first annular plug 804 and the second annular plug 801 are out of contact.

[0056] Then the third linear drive member extends downward to the maximum length, so that the upper end of the push rod 15 is lower than the lower end of the mounting shaft, at this time, the motor 13 is started, so that the arc rod 14 and the push rod 15 rotate along the output shaft of the motor 13 respectively, and the arc rod 14 and the push rod 15 are unfolded relative to the mounting shaft. At this time, the push rod 15 is located outside the oil filling ring 24 in the vertical direction.

[0057] The second linear drive member and the third linear drive member move upward and reset, driving the push rod 15 to press against the inner wall of the shell outside the oil filling ring 24. The upward movement of the pressure block 16 at the push rod 15 lifts the oil tank, and the sealing ring 6 is in close contact with the annular surface 23 of the oil tank shell to complete the sealing.

[0058] A differential pressure leak detector is used to supply gas to the inner cavity of the fuel tank, and the difference in gas pressure is used to determine whether the fuel tank is leaking.

[0059] When it is necessary to judge the sealing performance of the interference fit between the outer circumferential side of the oil filling ring 24 and the inner wall of the through hole, it can be judged by judging the value change of the first pressure sensor. In order to eliminate the influence of the leakage of the sealing plug assembly 8 on the air pressure in the ring sleeve 2, a detection space is set between the first annular plug 804 and the third annular plug 803, and it can be judged by the value change of the second pressure sensor.

[0060] When the oil tank inspection is completed, the lower ends of the second linear drive member and the third linear drive member extend downward respectively so that the upper end of the push rod 15 is lower than the lower end of the oil filling ring 24 again, and then the motor 13 rotates to tighten the push rod 15 on the outer circular side surface of the mounting shaft; the first linear drive member retracts to drive the entire sealing device to detach from the oil tank.

[0061] Example 2

[0062] like Fig.11 As shown, this embodiment provides an automatic air tightness detection device for a motorcycle fuel tank, which utilizes the sealing device for air tightness detection of the motorcycle fuel tank in Embodiment 1.

[0063] Specifically, it also includes a workbench 25, a leg 27 is provided at the lower end of the workbench 25, and a plurality of vertical limiting columns 26 are provided at the upper end surface of the workbench 25. The vertical height of the limiting columns 26 matches the outer shell shape of the oil tank, thereby realizing the limiting of the oil tank on the upper end surface of the workbench 25. The upper end of the workbench 25 is connected to a crossbeam 28 through a column, and the crossbeam 28 is fixed to the upper end of the first linear drive member.

[0064] It should be pointed out that the present embodiment may also include an automatic loading and unloading mechanism for the oil tank, a blocking mechanism for small holes other than the oil filling hole, etc. These structures may adopt existing technologies and will not be described in detail here.

[0065] So far, the technical solution of the present application has been described in conjunction with the preferred embodiments of the foregoing text, but it is easy for those skilled in the art to understand that the protection scope of the present application is not limited to the above preferred embodiments. Without departing from the technical principles of the present application, those skilled in the art may split and combine the technical solutions in the above preferred embodiments, and may also make equivalent changes or replacements to the relevant technical features, and any changes, equivalent replacements, improvements, etc. made within the technical concept and / or technical principles of the present application will fall within the protection scope of the present application.

Claims

1. A sealing device for detecting air tightness of a motorcycle fuel tank, characterized in that: include: A first linear drive member, the lower end of which can be lifted and lowered vertically; A second linear drive member, which is coaxially fixed to the lower end of the first linear drive member, and the lower end of the second linear drive member can be vertically lifted; A mounting shaft coaxially fixed to the lower end of the second linear drive member; A ring sleeve, which is coaxially sleeved outside the second linear drive member and the mounting shaft, the upper end of the ring sleeve is fixed to the lower end of the first linear drive member, and a coaxial sealing ring is fixed to the lower end surface of the ring sleeve; A third linear drive member, the lower end of which can be lifted vertically, the upper end of the third linear drive member is fixed to the mounting shaft, and the lower end is fixed to the mounting plate through a horizontal connecting plate, the mounting plate is fixed with two motors with output shafts facing vertically downward, two arc-shaped rods are arranged below the mounting plate, one end of the arc-shaped rod is fixed to the output shaft, and the other end is fixed with a vertically upward push rod, the motor can drive the arc-shaped rod to rotate, so that the push rod can be switched between being close to the mounting shaft and being away from the mounting shaft; The outer sleeve of the installation shaft is provided with a sealing plug assembly, which can achieve sealing between the inner side of the oil injection ring and the installation shaft; the installation shaft is provided with an air channel, one end of the air channel passes through the side of the installation shaft and is connected with one end of the air pipe, the other end of the air pipe passes through the ring sleeve and is connected with the differential pressure airtight leak detector, the other end of the air channel passes through the lower end surface of the installation shaft, and the inner side surface of the ring sleeve is provided with a first gas pressure sensor; The sealing plug assembly comprises a first annular plug slidably sleeved on the outside of the installation shaft and a second annular plug fixedly sleeved on the outside of the installation shaft, the lower part of the inner hole in the first annular plug is a tapered hole, the second annular plug is a frustum, and the second annular plug can be inserted into the first annular plug to achieve sealing between the two; The outside of the installation shaft is provided with a shaft shoulder, the shaft shoulder is located on the upper part of the first annular plug, a spring is provided between the shaft shoulder and the first annular plug, and the spring is sleeved on the outside of the installation shaft.

2. The sealing device for detecting air tightness of a motorcycle fuel tank according to claim 1, characterized in that: A third annular plug is arranged above the first annular plug, and the two are connected via a supporting ring; a second gas pressure sensor is arranged in the gap between the first annular plug and the third annular plug.

3. The sealing device for detecting air tightness of a motorcycle fuel tank according to claim 1, characterized in that: The installation shaft is a stepped shaft with two shaft sections, the outer diameter of each shaft section of the stepped shaft gradually decreases in the direction away from the first linear drive member, and the push rod can be tightened at the outer circular side surface of the lower half of the shaft section.

4. The sealing device for detecting air tightness of a motorcycle fuel tank according to claim 1, characterized in that: An elastic pressing block is fixed to the upper end of the push rod.

5. The sealing device for detecting air tightness of a motorcycle fuel tank according to claim 1, characterized in that: A vertical mounting groove is provided at the edge of the lower end surface of the mounting shaft, and one end of the third linear drive member is fixed in the mounting groove.

6. The sealing device for detecting air tightness of a motorcycle fuel tank according to claim 1, characterized in that: The arc-shaped rod is a semicircular rod.

7. The sealing device for detecting air tightness of a motorcycle fuel tank according to claim 1, characterized in that: The sealing ring is an elastic structure.

8. A motorcycle fuel tank airtightness automatic detection device, characterized in that: The sealing device for detecting air tightness of a motorcycle fuel tank is utilized as described in any one of claims 1 to 7.

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