A tire airtightness performance detection device

Abstract

The present invention provides a tire airtightness detection device, which relates to the technical field of tire detection. It includes a workbench, with a storage platform fixedly connected to each of the left and right sides of the workbench. The upper surface of the workbench is provided with a circular working groove, and the inner bottom surface of the working groove is provided with a turntable. The upper surface of the turntable is fixedly connected with a test bench assembly. The inner bottom surface of the working groove is also provided with an air pipe, which is communicated with a gas charging and discharging assembly. The upper surface of the workbench is also provided with an annular groove, which surrounds the outside of the working groove, and a pressurizing assembly is arranged in the annular groove. By monitoring the air pressure change inside the tire, the air pressure method can accurately detect a slight air pressure drop, help identify the air leakage point of the tire, and even a tiny air leakage can be detected, reducing the error of manual operation and improving the consistency and reliability of the detection.

Description

Technical Field

[0001] The present invention relates to the technical field of tire detection, and particularly relates to a tire airtightness detection device. Background Art

[0002] A tire is an annular elastic rubber product that rolls on the ground and is equipped on various vehicles or mechanical equipment. Tires are usually installed on metal rims, which can support the vehicle body, buffer external impacts, achieve contact with the road surface and ensure the driving performance of the vehicle. The performance of tires is crucial for the driving of automobiles. The quality of automobile tires not only threatens the life and property safety of drivers, but also affects the life and property safety of people around. Therefore, the quality of automobile tires must be guaranteed. The airtightness of automobile tires is an important parameter of the quality of automobile tires and has a crucial impact on the tire quality. At present, the commonly used method for detecting the airtightness of tires is manual detection, that is, putting the tire into water to find the air leakage point. Since the movement of the tire during the working process will disturb the water surface, this detection method will cause missed detection of the air leakage point, and thus the accuracy of the airtightness detection result is low. Summary of the Invention

[0003] The present invention provides a tire airtightness detection device to solve the defect of low accuracy of the airtightness detection result when finding the air leakage point by putting the tire into water in the prior art.

[0004] On the one hand, the present invention provides a tire airtightness detection device, which includes a workbench. A storage table is fixedly connected to each of the left and right sides of the workbench. A circular work groove is arranged on the upper surface of the workbench. A turntable is arranged on the inner bottom surface of the work groove. A test bench assembly is fixedly connected to the upper surface of the turntable. An air pipe is also arranged on the inner bottom surface of the work groove, and the air pipe is communicated with a charging and discharging assembly. An annular groove is also arranged on the upper surface of the workbench, and the annular groove surrounds the outside of the work groove. A pressurizing assembly is arranged in the annular groove.

[0005] Preferably, the test bench assembly includes a support table, which is fixedly connected to the upper surface of the turntable. A first working cavity is arranged inside the support table. A driving seat is fixedly connected to the inner bottom surface of the first working cavity. A limiting column is fixedly connected to the upper surface of the driving seat. Two groups of electric telescopic rods arranged in the up and down direction are arranged on the upper surface of the driving seat. The two electric telescopic rods are respectively arranged on the left and right sides of the limiting column. A central column is slidably sleeved on the limiting column in the up and down direction. The lower surface of the central column is fixedly connected to the telescopic end of the electric telescopic rod. A first fastening assembly is arranged inside the central column. A group of second fastening assemblies are respectively arranged in the front, rear, left and right directions of the support table.

[0006] Preferably, a second working chamber is arranged inside the central column. The first fastening assembly includes a first mounting seat fixedly connected to the upper surface of the limiting column. A first sliding rod is slidably connected in the first mounting seat in the vertical direction. A first spring is fixedly connected between the first sliding rod and the inner bottom surface of the first mounting seat. The upper end of the first sliding rod is fixedly connected with a receiving box. An airbag is placed inside the receiving box. The top of the airbag contacts the box cover. A plurality of positioning rods are fixedly connected to the lower surface of the box cover. A plurality of positioning holes are arranged inside the side wall of the receiving box. The positioning rods are slidably connected in the positioning holes in the vertical direction. A set of pressing assemblies are respectively arranged in the front, rear, left, and right directions of the airbag.

[0007] Preferably, four protruding holes corresponding to the pressing assemblies are arranged on the outer wall of the central column. The pressing assembly includes a second sliding rod which slidably penetrates the side wall of the receiving box in the horizontal direction. A first limiting plate is fixedly connected to the end of the second sliding rod close to the airbag. A second spring is fixedly connected between the first limiting plate and the inner wall of the receiving box. A pressing block is fixedly connected to the end of the second sliding rod far from the airbag. The pressing block protrudes from the protruding hole.

[0008] Preferably, the second fastening assembly includes a second mounting seat which slidably penetrates the outer wall of the support platform in the horizontal direction. A second limiting plate is fixedly connected to the end of the second mounting seat close to the central column. A third spring is fixedly connected between the second limiting plate and the inner wall of the first working chamber. A transmission rod is hinged to the second limiting plate. The other end of the transmission rod is hinged to the outer wall of the central column. A third working chamber is arranged inside the second mounting seat. A third sliding rod is slidably connected in the third working chamber in the horizontal direction. A third limiting plate is fixedly connected to the end of the third sliding rod close to the third working chamber. A fourth spring is fixedly connected between the third limiting plate and the inner wall of the third working chamber. A support block is fixedly connected to the end of the third sliding rod far from the third working chamber.

[0009] Preferably, the pressurizing assembly includes an electric annular guide rail fixedly connected to the inner bottom surface of the annular groove. Two synchronously moving sliding blocks are symmetrically arranged on the electric annular guide rail. A set of extrusion assemblies are arranged on each sliding block for applying an extrusion force to the tire.

[0010] Preferably, the extrusion assembly includes a support rod fixedly connected to the upper surface of the sliding block. The upper end of the support rod is fixedly connected with a mounting platform. A horizontally arranged hydraulic tank is installed on the mounting platform. The output end of the hydraulic tank is provided with a horizontally arranged output rod. A pressurizing plate is fixedly connected to the output rod.

[0011] Preferably, it further includes a performance evaluation module which includes:

[0012] An air pressure acquisition unit for obtaining the actual air pressure of the tire;

[0013] A leakage evaluation unit for evaluating the airtightness state of the tire;

[0014] wherein, G is the evaluation parameter of the tire air leakage severity; are respectively the weighted calculation coefficients of the air pressure change amount, the air leakage rate and the air pressure leakage stability; is the initial air pressure of the tire; is the current actual tire air pressure; is the current actual ambient temperature; is the standard detection temperature; is the initial air pressure of the standard tire airtightness detection; is the maximum allowable air pressure change amount; is the actual time experienced when the air pressure of the tire drops to the preset threshold after inflation; is the preset reference time length when the air pressure of the tire drops to the preset threshold after inflation; M is the total number of times of squeezing the tire; is the air pressure change value generated by the i-th squeezing of the tire; S is the maximum allowable air pressure change fluctuation variance; is the ceiling symbol;

[0015] When the evaluation parameter of the tire air leakage severity is less than the preset first threshold, it is determined that the airtightness of the tire is good;

[0016] When the evaluation parameter of the tire air leakage severity is greater than the preset first threshold and less than the preset second threshold, it is determined that there are slight problems with the airtightness of the tire;

[0017] When the evaluation parameter of the tire air leakage severity is greater than the preset second threshold, it is determined that there are serious problems with the airtightness of the tire;

[0018] The processing method determination unit is used to determine the processing method of the tire after the detection is completed;

[0019] For the tire with good airtightness, no processing is performed;

[0020] For the tire with slight airtightness problems, repair is performed;

[0021] For the tire with serious airtightness problems, scrapping treatment is performed;

[0022] The alarm unit, when there are tires with slight airtightness problems and serious airtightness problems, gives an alarm with the corresponding alarm ringtone.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] By monitoring the air pressure changes inside the tire, the air pressure method can accurately detect subtle air pressure drops, helping to identify the air leakage points of the tire. Even minor air leaks can be detected, reducing the errors caused by manual operation and improving the consistency and reliability of the detection.

[0025] Using the method of monitoring the air pressure changes of the tire to detect the airtightness of the tire will not cause any physical damage to the tire body. The tire can be repeatedly detected without damaging its integrity. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0028] Figure 2 is a front view structural schematic diagram of the workbench of the present invention;

[0029] Figure 3 is Figure 2 an enlarged schematic diagram of part A in

[0030] Figure 4 is Figure 2 an enlarged schematic diagram of part B in

[0031] Figure 5 is Figure 3 an enlarged schematic diagram of part C in

[0032] Reference numerals:

[0033] 1. Workbench; 2. Storage table; 3. Working groove; 4. Turntable; 5. Air pipe; 6. Inflation and deflation assembly; 7. Annular groove; 8. Support table; 9. First working chamber; 10. Driving seat; 11. Limit post; 12. Electric telescopic rod; 13. Central column; 14. Second working chamber; 15. First mounting seat; 16. First sliding rod; 17. First spring; 18. Accommodating box; 19. Airbag; 20. Box cover; 21. Positioning rod; 22. Positioning hole; 23. Extension hole; 24. Second sliding rod; 25. First limiting plate; 26. Second spring; 27. Pressing block; 28. Second mounting seat; 29. Second limiting plate; 30. Third spring; 31. Transmission rod; 32. Third working chamber; 33. Third sliding rod; 34. Third limiting plate; 35. Fourth spring; 36. Support block; 37. Electric annular guide rail; 38. Sliding block; 39. Support rod; 40. Installation platform; 41. Hydraulic tank; 42. Output rod; 43. Pressing plate; 44. Pressing-down assembly; 45. Second tightening assembly; 46. Pressing assembly. Specific embodiments

[0034] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without any creative efforts shall fall within the protection scope of the present invention.

[0035] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes, and do not particularly refer to the meaning of order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions and technical features between various embodiments may be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0036] Embodiment 1

[0037] An embodiment of the present invention provides a tire airtightness detection device, as Figure 1-2As shown in the figure, it includes a workbench 1. On the left and right sides of the workbench 1, there is a storage table 2 fixedly connected respectively. On the upper surface of the workbench 1, there is a circular work groove 3. On the inner bottom surface of the work groove 3, there is a turntable 4. On the upper surface of the turntable 4, there is a test bench assembly fixedly connected. On the inner bottom surface of the work groove 3, there is also an air pipe 5, and the air pipe 5 is communicated with an air charging and discharging assembly 6. On the upper surface of the workbench 1, there is also an annular groove 7, and the annular groove 7 surrounds the outside of the work groove 3. In the annular groove 7, there is a pressurizing assembly 46.

[0038] In this embodiment, the air charging and discharging assembly 6 is a prior art, such as a tire air charging and discharging system and control method disclosed in CN119175967A.

[0039] The beneficial effects of the above technical solution are as follows:

[0040] When performing airtightness detection on a tire, place the tire to be detected on the test bench assembly, connect the air pipe 5 to the inflation port of the tire, inflate the tire to the specified air pressure and then close the air valve, and monitor the air pressure change of the tire, so as to realize the airtightness detection of the tire. By applying an extrusion force to the surface of the tire through the pressurizing assembly 46, the bearing pressure condition of the tire during work is simulated, so as to realize the airtightness detection of the tire under the bearing pressure condition, and further improve the accuracy of the airtightness detection result.

[0041] Through the setting of the turntable 4, it is convenient for the staff to manually rotate the tire on the horizontal plane after the tire is installed on the test bench assembly, reducing the rotation difficulty of the tire, improving the use convenience of this device, and facilitating the connection between the inflation port of the tire and the air pipe 5. Through the setting of the two storage tables 2, the tires that have not been detected and the detected tires can be temporarily placed, further improving the use convenience of this device.

[0042] By monitoring the air pressure change inside the tire, the air pressure method can accurately detect a slight air pressure drop, help identify the air leakage point of the tire, and even a tiny air leakage can be detected, reducing the error of manual operation and improving the consistency and reliability of the detection.

[0043] Using the method of monitoring the air pressure change of the tire to detect the airtightness of the tire will not cause any physical damage to the tire body. The tire can be repeatedly detected without damaging its integrity.

[0044] Using the method of monitoring the air pressure change of the tire can complete the airtightness detection of the tire in a short time. By quickly measuring the pressure change inside the tire, the detection personnel can quickly judge whether the tire is qualified, which is suitable for batch detection on the production line or at the repair point, can greatly improve the detection efficiency, reduce manual intervention, and meet the large-scale tire detection requirements.

[0045] Embodiment 2

[0046] Based on Embodiment 1, as Figure 1-5 shown, the test bench assembly includes a support table 8, the support table 8 is fixedly connected to the upper surface of the turntable 4, a first working cavity 9 is arranged inside the support table 8, a driving seat 10 is fixedly connected to the inner bottom surface of the first working cavity 9, a limiting column 11 is fixedly connected to the upper surface of the driving seat 10, two groups of electric telescopic rods 12 arranged in the up-and-down direction are arranged on the upper surface of the driving seat 10, the two electric telescopic rods 12 are respectively arranged on the left and right sides of the limiting column 11, a central column 13 is slidably sleeved on the limiting column 11 in the up-and-down direction, the lower surface of the central column 13 is fixedly connected to the telescopic end of the electric telescopic rod 12, a first fastening assembly is arranged inside the central column 13, and a group of second fastening assemblies are respectively arranged in the front, back, left and right directions of the support table 8.

[0047] Preferably, a second working cavity 14 is arranged inside the central column 13, the first fastening assembly includes a first mounting seat 15, the first mounting seat 15 is fixedly connected to the upper surface of the limiting column 11, a first sliding rod 16 is slidably connected to the first mounting seat 15 in the up-and-down direction, a first spring 17 is fixedly connected between the first sliding rod 16 and the inner bottom surface of the first mounting seat 15, the upper end of the first sliding rod 16 is fixedly connected to a receiving box 18, an airbag 19 is placed inside the receiving box 18, the top of the airbag 19 is in contact with a box cover 20, a plurality of positioning rods 21 are fixedly connected to the lower surface of the box cover 20, a plurality of positioning holes 22 are arranged inside the side wall of the receiving box 18, the positioning rods 21 are slidably connected to the positioning holes 22 in the up-and-down direction, and a group of pressing components 44 are respectively arranged in the front, back, left and right directions of the airbag 19.

[0048] Preferably, four protruding holes 23 corresponding to the pressing components 44 are arranged on the outer wall of the central column 13, the pressing component 44 includes a second sliding rod 24, the second sliding rod 24 slidably penetrates through the side wall of the receiving box 18 in the horizontal direction, a first limiting plate 25 is fixedly connected to the end of the second sliding rod 24 close to the airbag 19, a second spring 26 is fixedly connected between the first limiting plate 25 and the inner wall of the receiving box 18, a pressing block 27 is fixedly connected to the end of the second sliding rod 24 far from the airbag 19, and the pressing block 27 protrudes from the protruding hole 23.

[0049] Preferably, the second fastening assembly includes a second mounting base 28 which slidably penetrates through the outer wall of the support platform 8 in the horizontal direction. One end of the second mounting base 28 close to the central column 13 is fixedly connected with a second limiting plate 29. A third spring 30 is fixedly connected between the second limiting plate 29 and the inner wall of the first working chamber 9. A transmission rod 31 is hinged on the second limiting plate 29, and the other end of the transmission rod 31 is hinged on the outer wall of the central column 13. A third working chamber 32 is arranged in the second mounting base 28. A third sliding rod 33 is slidably connected in the third working chamber 32 in the horizontal direction. One end of the third sliding rod 33 close to the third working chamber 32 is fixedly connected with a third limiting plate 34. A fourth spring 35 is fixedly connected between the third limiting plate 34 and the inner wall of the third working chamber 32. The end of the third sliding rod 33 far from the third working chamber 32 is fixedly connected with a support block 36.

[0050] The beneficial effects of the above technical solutions are as follows:

[0051] When installing the tire, place the tire on the upper surface of the support platform 8. The central column 13 passes through the mounting hole in the center of the tire and extends out. Then, control the two electric telescopic rods 12 to contract synchronously, so that the central rod moves downward, thereby causing the box cover to squeeze the airbag 19. An extrusion force is applied to the pressing-down assembly 44 through the airbag 19, so that the second spring 26 is compressed, and the protruding block protrudes from the protruding hole 23. As the central column 13 further descends, the pressing-down block 27 descends accordingly until the pressing-down block 27 presses on the upper surface of the tire from above, completing the fixation of the tire in the vertical direction.

[0052] As the central column 13 descends, through the arrangement of the transmission rod 31, the second fastening assembly slides in a direction away from the central column 13, and further makes the support block 36 in close contact with the inner wall of the tire, thereby realizing the fixation of the tire in the horizontal direction. Through the arrangement of the fourth spring 35, when the support block 36 is in close contact with the inner wall of the tire, the second mounting base 28 can still move, and will not cause damage to the inner surface of the tire, thereby improving the adaptability of the detection device to tires of different specifications.

[0053] When the airtightness detection of the tire is completed, control the two electric telescopic rods 12 to extend synchronously. Under the action of the first spring 17, the accommodating box 18 moves upward. When the central column 13 reaches the highest position, under the action of the second spring 26, the second sliding rod 24 moves in a direction close to the central column 13, thereby squeezing the airbag 19 and jacking up the box cover. At the same time, the pressing-down block 27 is received into the protruding hole 23, and the second mounting base 28 returns to its original position under the action of the third spring 30 and the transmission rod 31, thereby completing the release of the tire.

[0054] By controlling the two electric telescopic rods 12, the locking of the tire in the horizontal and vertical directions can be completed simultaneously, reducing the complexity of control. At the same time, the synchronization of the locking of the tire in the horizontal and vertical directions is ensured, avoiding the inclination of the tire during the locking process, which may cause damage to the tire or the equipment. Through the setting of the first fastening component and the second fastening component, the detection device can match different tire models.

[0055] Embodiment 3

[0056] On the basis of any one of Embodiments 1-2, as Figure 2 shown, the pressurizing component 46 includes an electric annular guide rail 37, which is fixedly connected to the inner bottom surface of the annular groove 7. Two synchronously moving sliding blocks 38 are symmetrically arranged on the electric annular guide rail 37, and a set of pressing components are arranged on each sliding block 38 for applying a pressing force to the tire.

[0057] Preferably, the pressing component includes a support rod 39, which is fixedly connected to the upper surface of the sliding block 38. The upper end of the support rod 39 is fixedly connected with an installation platform 40, and a horizontally arranged hydraulic tank 41 is installed on the installation platform 40. The output end of the hydraulic tank 41 is provided with an output rod 42 in the horizontal direction, and a pressing plate 43 is fixedly connected to the output rod 42.

[0058] The beneficial effects of the above technical solution are as follows:

[0059] After the tire is installed, by applying pressure to the tire surface through the pressing plate 43, the pressure-bearing state of the tire during actual use can be simulated, thereby improving the reliability of the tire airtightness detection result. At the same time, by applying pressure to the tire surface, the gas leakage speed of the tire with insufficient airtightness can be increased, thereby increasing the degree of air pressure change of the tire, and further improving the accuracy of the tire airtightness detection result, avoiding the missed detection of some tiny leakage points. By driving the pressing component to move on the annular guide rail through the sliding block 38, the extrusion of different positions of the tire is realized, avoiding the blockage of some tiny leakage points caused by the extrusion at a single position, and further improving the accuracy of the tire airtightness detection result.

[0060] Embodiment 4

[0061] On the basis of any one of Embodiments 1-3, it further includes a performance evaluation module, and the performance evaluation module includes:

[0062] An air pressure acquisition unit for obtaining the actual air pressure of the tire;

[0063] An air leakage evaluation unit for evaluating the airtightness state of the tire;

[0064] ; where G is the evaluation parameter of the air leakage severity of the tire. They are the weighted calculation coefficients of the air pressure change amount, the air leakage rate, and the air pressure leakage stability respectively; is the initial air pressure of the tire; is the current actual tire air pressure; is the current actual ambient temperature; is the standard detection temperature; is the initial air pressure for the standard tire airtightness detection; is the maximum allowable air pressure change amount; is the actual time experienced when the air pressure of the tire drops to the preset threshold after inflation; is the preset reference time length when the air pressure of the tire drops to the preset threshold after inflation; M is the total number of times the tire is squeezed; is the air pressure change value generated by the i-th squeeze of the tire; S is the maximum allowable air pressure change fluctuation variance; is the ceiling symbol;

[0065] When the air leakage severity evaluation parameter of the tire is less than the preset first threshold, it is determined that the airtightness of the tire is good;

[0066] When the air leakage severity evaluation parameter of the tire is greater than the preset first threshold and less than the preset second threshold, it is determined that there are slight problems with the airtightness of the tire;

[0067] When the air leakage severity evaluation parameter of the tire is greater than the preset second threshold, it is determined that there are serious problems with the airtightness of the tire;

[0068] The processing method determination unit is used to determine the processing method of the tire for which the detection is completed;

[0069] For the tire with good airtightness, no processing is performed;

[0070] For the tire with slight airtightness problems, repair is performed;

[0071] For the tire with serious airtightness problems, scrapping treatment is performed;

[0072] The alarm unit alarms with the corresponding alarm ringtone when there are tires with slight airtightness problems and serious airtightness problems.

[0073] In this embodiment, the maximum allowable air pressure change fluctuation variance refers to the maximum value of the variance for evaluating the stability of the air pressure change speed when different positions of the tire are squeezed.

[0074] The beneficial effects of the above technical solution are:

[0075] By evaluating the severity of tire air leakage from three aspects: the change value of tire air pressure, the rate of air pressure change, and the change stability of the air pressure change rate after being squeezed at different positions, the accuracy of judging tire air leakage is improved, thus providing reliable data support for subsequent judgment of tire treatment methods.

[0076] By judging the airtightness of the tire according to the tire air leakage severity judgment parameter, the misjudgment caused by the subjective judgment of the tire airtightness by the staff is avoided. The treatment method for the tire is automatically selected according to the severity of tire air leakage, which improves the reliability of the selection of tire treatment methods, thus ensuring the reasonable treatment of the tires that have completed the airtightness detection. By automatically selecting the treatment method for the tire, the dependence on the work experience of the staff is eliminated, and the accuracy of the selection of treatment methods is improved.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A tire airtightness testing device, characterized in that: The workbench (1) comprises a storage table (2) fixedly connected to the left and right sides of the workbench (1), a circular working groove (3) is arranged on the upper surface of the workbench (1), a turntable (4) is arranged on the inner bottom surface of the working groove (3), a test bench assembly is fixedly connected to the upper surface of the turntable (4), an air pipe (5) is also arranged on the inner bottom surface of the working groove (3), the air pipe (5) is connected to the air charging and discharging assembly (6), an annular groove (7) is also arranged on the upper surface of the workbench (1), the annular groove (7) surrounds the outer side of the working groove (3), and a pressurizing assembly (46) is arranged in the annular groove (7); The test bench assembly comprises a support platform (8), the support platform (8) is fixedly connected to the upper surface of the turntable (4), a first working chamber (9) is arranged inside the support platform (8), a driving seat (10) is fixedly connected to the inner bottom surface of the first working chamber (9), a limiting column (11) is fixedly connected to the upper surface of the driving seat (10), two groups of electric telescopic rods (12) arranged in the up-down direction are arranged on the upper surface of the driving seat (10), the two electric telescopic rods (12) are respectively arranged on the left and right sides of the limiting column (11), a center column (13) is slidably sleeved on the limiting column (11) in the up-down direction, the lower surface of the center column (13) is fixedly connected to the telescopic end of the electric telescopic rod (12), a first fastening assembly is arranged inside the center column (13), and a group of second fastening assemblies are respectively arranged in the front, back, left and right directions of the support platform (8); A second working chamber (14) is provided in the central column (13), and a first fastening assembly comprises a first mounting seat (15), the first mounting seat (15) is fixedly connected to the upper surface of the limiting column (11), a sliding rod (16) is slidably connected in the first mounting seat (15) along the up-down direction, a spring (17) is fixedly connected between the sliding rod (16) and the inner bottom surface of the first mounting seat (15), an upper end of the sliding rod (16) is fixedly connected to a containing box (18), an air bag (19) is placed in the containing box (18), the top end of the air bag (19) is in contact with the box cover (20), a plurality of positioning rods (21) are fixedly connected to the lower surface of the box cover (20), a plurality of positioning holes (22) are provided in the side wall of the containing box (18), the positioning rods (21) are slidably connected in the positioning holes (22) along the up-down direction, and a group of pressing components (44) are respectively provided in the front, back, left, and right directions of the air bag (19); The outer wall of the center column (13) is provided with four extending holes (23) corresponding to the pressing assembly (44), the pressing assembly (44) comprises a second sliding rod (24), the second sliding rod (24) slides in the horizontal direction and penetrates the side wall of the accommodating box (18), the end of the second sliding rod (24) close to the airbag (19) is fixedly connected to a limiting plate (25), a second spring (26) is fixedly connected between the limiting plate (25) and the inner wall of the accommodating box (18), the end of the second sliding rod (24) away from the airbag (19) is fixedly connected to a pressing block (27), and the pressing block (27) extends out of the extending hole (23); The second fastening assembly comprises a second mounting seat (28), the second mounting seat (28) slides in the horizontal direction and penetrates the outer wall of the support platform (8), one end of the second mounting seat (28) close to the central column (13) is fixedly connected to a second limiting plate (29), a third spring (30) is fixedly connected between the second limiting plate (29) and the inner wall of the first working chamber (9), a transmission rod (31) is hinged on the second limiting plate (29), and the other end of the transmission rod (31) is hinged on the outer wall of the central column (13) A third working chamber (32) is provided in the second mounting seat (28), a sliding rod three (33) is slidably connected in the third working chamber (32) along the horizontal direction, one end of the sliding rod three (33) close to the third working chamber (32) is fixedly connected to a limiting plate three (34), a spring four (35) is fixedly connected between the limiting plate three (34) and the inner wall of the third working chamber (32), and one end of the sliding rod three (33) away from the third working chamber (32) is fixedly connected to a support block (36).

2. A tire airtightness testing device according to claim 1, characterized in that: The pressurizing assembly (46) comprises an electric annular guide rail (37), which is fixedly connected to the inner bottom surface of the annular groove (7), and two sliding blocks (38) that move synchronously are symmetrically arranged on the electric annular guide rail (37), and each sliding block (38) is provided with a group of extrusion assemblies, which are used to apply extrusion force to the tire.

3. A tire airtightness testing device according to claim 2, characterized in that: The extrusion assembly comprises a support rod (39), the support rod (39) is fixedly connected to the upper surface of the sliding block (38), the upper end of the support rod (39) is fixedly connected to a mounting platform (40), a horizontally arranged hydraulic box (41) is installed on the mounting platform (40), an output end of the hydraulic box (41) is provided with an output rod (42) in a horizontal direction, and a pressure plate (43) is fixedly connected to the output rod (42).

4. A tire airtightness testing device according to claim 1, characterized in that: It also includes a performance evaluation module, which includes: Air pressure collection unit, used to obtain the actual air pressure of the tire; Leakage assessment unit, used to assess the air tightness status of the tire; ; Wherein, G is the tire leakage severity assessment parameter; They are weighted calculation coefficients of air pressure change, air leakage rate and air pressure leakage stability respectively; is the initial air pressure of the tire; The actual tire pressure at present; is the current actual ambient temperature; is the standard test temperature; It is the initial air pressure for standard tire air tightness test; is the maximum allowable air pressure change; The actual time it takes for the tire pressure to drop to the preset threshold after the tire is inflated; is the preset reference time length for the air pressure of the tire to drop to the preset threshold after the tire is inflated; M is the total number of times the tire is squeezed; is the pressure change value caused by squeezing the tire for the i-th time; S is the maximum allowable pressure change fluctuation variance; is the rounding symbol; When the tire leakage severity assessment parameter is less than a preset first threshold, it is judged that the tire air tightness is good; When the tire leakage severity assessment parameter is greater than a preset first threshold value and less than a preset second threshold value, it is determined that there is a slight problem with the air tightness of the tire; When the tire leakage severity assessment parameter is greater than a preset second threshold, it is determined that there is a serious problem with the air tightness of the tire; A processing method determination unit, used to determine a processing method for a tire that has been inspected; For tires with good air tightness, no treatment is performed; Repair tires with minor air tightness problems; Tires with serious airtightness problems will be scrapped; The alarm unit sounds an alarm with corresponding alarm bells when a tire has a slight airtightness problem or a serious airtightness problem.

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