Tire airtight performance detection device

Abstract

The invention provides a tire airtightness detection device, and relates to the technical field of tire detection, and the tire airtightness detection device comprises a workbench, the left and right sides of the workbench are fixedly connected with a storage table respectively, the upper surface of the workbench is provided with a circular working groove, the inner bottom surface of the working groove is provided with a rotary table, and the upper surface of the rotary table is fixedly connected with a test bed assembly. An air pipe is further arranged on the inner bottom face of the working groove and communicates with the inflation and deflation assembly, an annular groove is further formed in the upper surface of the workbench and surrounds the outer side of the working groove, and a pressurization assembly is arranged in the annular groove. By monitoring the air pressure change in the tire, the air pressure method can accurately detect tiny air pressure drop and help to identify the air leakage point of the tire, even tiny air leakage can be detected, the error of manual operation is reduced, and the consistency and reliability of detection are improved.

Description

Technical Field

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

[0002] Tires are ground-contacting, rolling, annular elastic rubber products equipped on various vehicles or mechanical equipment. Tires are usually installed on metal rims to support the vehicle body, cushion external impacts, achieve contact with the road surface and ensure the vehicle's driving performance. The performance of tires is crucial to the driving of the car. The quality of automobile tires not only threatens the life safety and property safety of drivers, but also affects the life safety and property safety of people around them. Therefore, the quality of automobile tires must be guaranteed. The air tightness of automobile tires is an important parameter of automobile tire quality and has a vital impact on its tire quality. The commonly used tire air tightness detection method is manual detection, which puts the tire into water to find the leak point. This detection method will cause the leak point to be missed due to the movement of the tire during work, which will disturb the water surface, thereby causing the problem of low accuracy of the air tightness detection result. Summary of the invention

[0003] The invention provides a tire air tightness performance detection device, which is used to solve the defect of low accuracy of air tightness detection result when the tire is placed in water to find the air leakage point in the prior art.

[0004] On the one hand, the present invention provides a tire airtight performance testing device, including a workbench, with a storage table fixedly connected to the left and right sides of the workbench respectively, a circular working groove is arranged on the upper surface of the workbench, a turntable is arranged on the bottom surface of the working groove, a test bench assembly is fixedly connected to the upper surface of the turntable, an air pipe is also arranged on the bottom surface of the working groove, the air pipe is connected to the inflation and deflation assembly, an annular groove is also arranged on the upper surface of the workbench, the annular groove surrounds the outer side of the working groove, and 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 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 along the up-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 center column is slidably sleeved on the limiting column along the up-down direction, the lower surface of the center column is fixedly connected to the telescopic end of the electric telescopic rod, a first fastening assembly is arranged in the center column, and a group of second fastening assemblies are respectively arranged in the front, back, left and right directions of the support table.

[0006] Preferably, a second working chamber is provided in the center column, and the first fastening assembly includes a first mounting seat, the first mounting seat is fixedly connected to the upper surface of the limiting column, a sliding rod 1 is slidably connected in the first mounting seat along the up and down directions, a spring 1 is fixedly connected between the sliding rod 1 and the inner bottom surface of the first mounting seat, the upper end of the sliding rod 1 is fixedly connected to a accommodating box, an airbag is placed in the accommodating box, the top of the airbag is in contact with 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 provided in the side wall of the accommodating box, the positioning rods are slidably connected in the positioning holes along the up and down directions, and a group of pressing components are respectively provided in the front, back, left and right directions of the airbag.

[0007] Preferably, four extension holes corresponding to the downward pressure assembly are provided on the outer wall of the center column, and the downward pressure assembly includes a sliding rod 2, which slides in the horizontal direction and penetrates the side wall of the accommodating box. The end of the sliding rod 2 close to the airbag is fixedly connected to a limiting plate 1, and a spring 2 is fixedly connected between the limiting plate 1 and the inner wall of the accommodating box. The end of the sliding rod 2 away from the airbag is fixedly connected to a downward pressure block, and the downward pressure block extends out of the extension hole.

[0008] Preferably, the second fastening assembly includes a second mounting seat, which slides in the horizontal direction and penetrates the outer wall of the support platform, and the end of the second mounting seat close to the center column is fixedly connected to the limiting plate 2, and a spring 3 is fixedly connected between the limiting plate 2 and the inner wall of the first working chamber, and a transmission rod is hinged on the limiting plate 2, and the other end of the transmission rod is hinged on the outer wall of the center column, and a third working chamber is arranged in the second mounting seat, and a sliding rod 3 is slidably connected in the third working chamber along the horizontal direction, and the end of the sliding rod 3 close to the third working chamber is fixedly connected to the limiting plate 3, and a spring 4 is fixedly connected between the limiting plate 3 and the inner wall of the third working chamber, and the end of the sliding rod 3 away from the third working chamber is fixedly connected to the support block.

[0009] Preferably, the pressurizing assembly includes an electric annular guide rail, which is 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, and each sliding block is provided with a group of extrusion assemblies, which are used to apply extrusion force to the tire.

[0010] Preferably, the extrusion assembly includes a support rod, which is fixedly connected to the upper surface of the sliding block. The upper end of the support rod is fixedly connected to a mounting platform, a horizontally arranged hydraulic box is installed on the mounting platform, and an output rod along the horizontal direction is arranged at the output end of the hydraulic box, and a pressure plate is fixedly connected to the output rod.

[0011] Preferably, a performance evaluation module is also included, and the performance evaluation module 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; is the current actual tire pressure; 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.

[0012] Compared with the prior art, the present invention has the following beneficial effects: By monitoring the changes in air pressure inside the tire, the air pressure method can accurately detect slight drops in air pressure and help identify tire leaks. Even tiny leaks can be detected, reducing errors caused by human operation and improving the consistency and reliability of detection.

[0013] The air tightness of the tire is tested by monitoring the change in tire pressure without causing any physical damage to the tire itself. The tire can be tested repeatedly without destroying its integrity. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the main structure of the workbench of the present invention; Figure 3 yes Figure 2 The enlarged schematic diagram at A in the middle; Figure 4 yes Figure 2 The enlarged schematic diagram of point B in the middle; Figure 5 yes Figure 3 Enlarged schematic diagram at point C in the middle.

[0016] Reference numerals: 1. Workbench; 2. Storage table; 3. Work slot; 4. Turntable; 5. Air pipe; 6. Inflatable and deflation assembly; 7. Annular slot; 8. Support table; 9. First working chamber; 10. Drive seat; 11. Limit column; 12. Electric telescopic rod; 13. Center column; 14. Second working chamber; 15. First mounting seat; 16. Sliding rod 1; 17. Spring 1; 18. Accommodating box; 19. Airbag; 20. Box cover; 21. Positioning rod; 22. Positioning hole; 23. Extending hole; 24. Sliding rod 2; 2 5. Limit plate one; 26. Spring two; 27. Pressing block; 28. Second mounting seat; 29. ​​Limit plate two; 30. Spring three; 31. Transmission rod; 32. Third working chamber; 33. Sliding rod three; 34. Limit plate three; 35. Spring four; 36. Support block; 37. Electric annular guide rail; 38. Sliding block; 39. Support rod; 40. Mounting platform; 41. Hydraulic box; 42. Output rod; 43. Pressure plate; 44. Pressing assembly; 45. Second tightening assembly; 46. Pressurizing assembly. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the 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 number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0019] Example 1 The embodiment of the present invention provides a tire airtightness performance detection device, such as Figure 1-2 As shown, it includes a workbench 1, and a storage table 2 is fixedly connected to the left and right sides of the workbench 1 respectively. A circular working groove 3 is arranged on the upper surface of the workbench 1, and 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, and 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 inflation and deflation assembly 6. An annular groove 7 is also arranged on the upper surface of the workbench 1, and 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.

[0020] In this embodiment, the inflation and deflation assembly 6 is a prior art, such as a tire inflation and deflation system and control method disclosed in CN119175967A.

[0021] The beneficial effects of the above technical solution are: When performing air tightness test on a tire, the tire to be tested is placed on the test bench assembly, the air pipe 5 is connected to the inflation port of the tire, the tire is inflated to a specified pressure and then the air valve is closed, and the air pressure change of the tire is monitored to achieve the air tightness test of the tire. The pressing force is applied to the tire surface by the pressurizing assembly 46 to simulate the pressure condition of the tire during operation, thereby achieving the air tightness test of the tire under pressure condition, and further improving the accuracy of the air tightness test result.

[0022] The setting of the turntable 4 makes it convenient for the staff to manually rotate the tire in the horizontal plane after the tire is installed on the test bench assembly, which reduces the difficulty of rotating the tire, improves the convenience of using the device, and makes it convenient for the staff to connect the tire inflation port with the air pipe 5. The setting of the two storage tables 2 can temporarily place untested and tested tires, further improving the convenience of using the device.

[0023] By monitoring the changes in air pressure inside the tire, the air pressure method can accurately detect slight drops in air pressure and help identify tire leaks. Even tiny leaks can be detected, reducing errors caused by human operation and improving the consistency and reliability of detection.

[0024] The air tightness of the tire is tested by monitoring the change in tire pressure without causing any physical damage to the tire itself. The tire can be tested repeatedly without destroying its integrity.

[0025] The method of monitoring tire pressure changes can complete the tire air tightness test in a short time. By quickly measuring the pressure changes in the tire, the inspector can quickly determine whether the tire is qualified. It is suitable for batch testing on the production line or maintenance point, which can greatly improve the testing efficiency, reduce manual intervention, and is suitable for large-scale tire testing needs.

[0026] Example 2 On the basis of Example 1, Figure 1-5 As shown, the test bench assembly includes a support table 8, which 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 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 along 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 along 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 in the center column 13. A group of second fastening assemblies are respectively arranged in the front, back, left and right directions of the support table 8.

[0027] Preferably, a second working chamber 14 is provided in the center column 13, and 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 sliding rod 16 is slidably connected in the first mounting seat 15 along the up and down directions, a spring 17 is fixedly connected between the sliding rod 16 and the inner bottom surface of the first mounting seat 15, the upper end of the sliding rod 16 is fixedly connected to a accommodating box 18, an airbag 19 is placed in the accommodating box 18, the top of the airbag 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 accommodating box 18, the positioning rods 21 are slidably connected in the positioning holes 22 along the up and down directions, and a group of pressing components 44 are respectively provided in the front, back, left and right directions of the airbag 19.

[0028] Preferably, four extension holes 23 corresponding to the downward pressure assembly 44 are provided on the outer wall of the center column 13, and the downward pressure assembly 44 includes a sliding rod 24, which slides in the horizontal direction and penetrates the side wall of the accommodating box 18. The end of the sliding rod 24 close to the airbag 19 is fixedly connected to a limiting plate 25, and a spring 26 is fixedly connected between the limiting plate 25 and the inner wall of the accommodating box 18. The end of the sliding rod 24 away from the airbag 19 is fixedly connected to a downward pressure block 27, and the downward pressure block 27 extends out from the extension hole 23.

[0029] Preferably, the second fastening assembly includes a second mounting seat 28, which slides in the horizontal direction through the outer wall of the support platform 8, and the end of the second mounting seat 28 close to the center column 13 is fixedly connected to a limiting plate 29, and a spring 30 is fixedly connected between the limiting plate 29 and the inner wall of the first working chamber 9, and a transmission rod 31 is hinged on the limiting plate 29, and the other end of the transmission rod 31 is hinged on the outer wall of the center column 13, and a third working chamber 32 is arranged in the second mounting seat 28, and a sliding rod 33 is slidably connected in the third working chamber 32 along the horizontal direction, and the end of the sliding rod 33 close to the third working chamber 32 is fixedly connected to a limiting plate 34, and a spring 4 35 is fixedly connected between the limiting plate 34 and the inner wall of the third working chamber 32, and the end of the sliding rod 33 away from the third working chamber 32 is fixedly connected to a support block 36.

[0030] The beneficial effects of the above technical solution are: When installing the tire, the tire is placed on the upper surface of the support platform 8, and the center column 13 extends through the installation hole in the center of the tire. Then, the two electric telescopic rods 12 are controlled to shrink synchronously to move the center rod downward, so that the box cover squeezes the airbag 19, and the airbag 19 applies an extrusion force to the downward pressing component 44, so that the spring 26 is compressed and the extending block extends from the extending hole 23. As the center column 13 further descends, the downward pressing block 27 descends therewith until the downward pressing block 27 presses the upper surface of the tire from above to complete the fixation of the tire in the vertical direction.

[0031] As the center column 13 descends, the transmission rod 31 is set to make the second fastening assembly slide away from the center column 13, so that the support block 36 is in close contact with the inner wall of the tire, thereby achieving horizontal fixation of the tire. Through the setting of the spring four 35, when the support block 36 is in close contact with the inner wall of the tire, the second mounting seat 28 can continue to move without causing damage to the inner surface of the tire, thereby improving the adaptability of the detection device to tires of different specifications.

[0032] When the air tightness test of the tire is completed, the two electric telescopic rods 12 are controlled to extend synchronously. Under the action of spring one 17, the accommodating box 18 moves upward. When the center column 13 rises to the highest position, under the action of spring two 26, the sliding rod two 24 moves toward the center column 13, thereby squeezing the airbag 19 and lifting the box cover. At the same time, the pressing block 27 is received into the extension hole 23, and the second mounting seat 28 returns to its original position under the action of spring three 30 and the transmission rod 31, thereby completing the release of the tire.

[0033] By controlling the two electric telescopic rods 12, the tire can be locked in the horizontal and vertical directions at the same time, reducing the complexity of control and ensuring the synchronization of the horizontal and vertical locking of the tire, avoiding the tire from tilting during the locking process, causing damage to the tire or damage to the equipment. Through the setting of the first fastening component and the second fastening component, the detection device can match different tire models.

[0034] Example 3 On the basis of any one of Examples 1-2, Figure 2 As shown, the pressurizing assembly 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 each sliding block 38 is provided with a group of extrusion assemblies, which are used to apply extrusion force to the tire.

[0035] Preferably, the extrusion assembly 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 to a mounting platform 40, and a horizontally arranged hydraulic box 41 is installed on the mounting platform 40. The output end of the hydraulic box 41 is provided with an output rod 42 along the horizontal direction, and a pressure plate 43 is fixedly connected to the output rod 42.

[0036] The beneficial effects of the above technical solution are: When the tire is installed, pressure is applied to the tire surface through the pressure plate 43 to simulate the pressure state of the tire during actual use, thereby improving the reliability of the tire air tightness test results. At the same time, by applying pressure to the tire surface, the gas leakage rate of the tire with insufficient air tightness can be increased, thereby increasing the degree of change in the tire's air pressure, and further improving the accuracy of the tire air tightness test results, avoiding missed detection of tiny leakage points. The sliding block 38 drives the extrusion assembly to move on the annular guide rail, thereby achieving extrusion of different positions of the tire, avoiding the blockage of some tiny leakage points caused by extrusion at a single position, and further improving the accuracy of the tire air tightness test results.

[0037] Example 4 Based on any one of Embodiments 1-3, a performance evaluation module is further included, and the performance evaluation module 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; is the current actual tire pressure; 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.

[0038] 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.

[0039] The beneficial effects of the above technical solution are: By evaluating the severity of tire leakage based on three aspects: the tire pressure change value, the pressure change rate, and the stability of the pressure change rate after being squeezed at different positions, the accuracy of judging the tire leakage situation is improved, thereby providing reliable data support for subsequent judgment of tire treatment methods.

[0040] The air tightness of the tire is judged according to the judgment parameters of the severity of the tire leakage, thereby avoiding the misjudgment caused by the subjective judgment of the tire air tightness by the staff. The tire treatment method is automatically selected according to the severity of the tire leakage, which improves the reliability of the selection of the tire treatment method, thereby ensuring the reasonable treatment of the tire that has completed the air tightness test. By automatically selecting the treatment method for the tire, it gets rid of the dependence on the work experience of the staff and improves the accuracy of the selection of the treatment method.

[0041] 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 it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions 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 invention comprises a workbench (1), wherein a storage table (2) is fixedly connected to the left and right sides of the workbench (1), respectively; 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 inflation and deflation 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).

2. A tire airtightness testing device according to claim 1, characterized in that: The test bench assembly comprises a support platform (8), wherein the support platform (8) is fixedly connected to the upper surface of a 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).

3. A tire airtightness testing device according to claim 2, characterized in that: A second working chamber (14) is provided in the central column (13); the 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); a receiving box (18) is fixedly connected to the upper end of the sliding rod (16); an air bag (19) is placed in the receiving 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 receiving 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).

4. A tire airtightness testing device according to claim 3, characterized in that: The outer wall of the center column (13) is provided with four extending holes (23) corresponding to the pressing assembly (44), and the pressing assembly (44) comprises a sliding rod (24) which slides in a horizontal direction and penetrates the side wall of the accommodating box (18), and one end of the sliding rod (24) close to the airbag (19) is fixedly connected to a limiting plate (25), and a spring (26) is fixedly connected between the limiting plate (25) and the inner wall of the accommodating box (18), and one end of the 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).

5. A tire airtightness testing device according to claim 2, characterized in that: 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).

6. 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.

7. A tire airtightness testing device according to claim 6, 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).

8. 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.

Images