Automobile wheel rim air tightness testing device

Abstract

The application discloses airtightness testing equipment for automobile wheel rim and relates to the technical field of automobile part detection. The equipment comprises a pair of symmetrically arranged airtight rings, a limiting device arranged between the airtight rings, an inner cover body and an outer cover body of the limiting device, and openings arranged on the inner cover body and the outer cover body for putting in or taking out the wheel rim. The inner cover body and the outer cover body are connected with the airtight rings and can rotate relative to each other. The airtightness testing equipment for automobile wheel rim realizes the organic combination of the quick mounting and dismounting and the stable limiting of the wheel rim by arranging the limiting device composed of the inner cover body and the outer cover body and arranging the coinciding or misaligned openings on the inner cover body and the outer cover body. During operation, the openings are adjusted to be coincided only at the mounting and dismounting moment, and the openings are misaligned during the rest testing time, so that the wheel rim can be reliably limited in the testing cavity, and the testing efficiency and the operation convenience are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of automotive parts testing technology, specifically to an airtightness testing device for automotive wheel rims. Background Technology

[0002] As a key component of the wheel assembly that bears the tire, the airtightness of automotive wheel rims directly affects driving safety. During automobile manufacturing and repair, rigorous airtightness testing is required for wheel rims to screen out defective products with micropores, cracks, and other defects. Currently, wheel rim airtightness testing typically involves sealing the internal space of the rim with a sealing device, then filling the sealed space with compressed air or helium, and monitoring pressure changes or gas leakage to determine the rim's compliance.

[0003] Existing equipment for testing the airtightness of wheel rims typically includes a pair of opposing airtight rings. During testing, the wheel rim is placed between the two airtight rings, and a drive mechanism brings the two airtight rings closer together, pressing them against the bead seats on both sides of the wheel rim to form a sealed cavity. Test gas is then injected into this sealed cavity, and pressure sensors and other detection elements are used to determine whether the airtightness meets the standard. To improve testing efficiency and adaptability, some equipment is also equipped with a radially movable clamping mechanism to accommodate wheel rims of different diameters, and uses elastic elements such as airbags to enhance the sealing effect.

[0004] However, the aforementioned existing technologies still have certain limitations in practical applications. First, the process of inserting and removing the rim is relatively cumbersome, usually requiring the airtight ring to be moved to a larger distance to complete the installation and removal, which is inconvenient and affects the testing cycle. Second, the sealing structure of existing equipment requires high positioning accuracy of the rim. If the rim is not accurately centered in the testing chamber, it can easily lead to poor sealing or uneven wear of the airbag, affecting the accuracy of the test results and the service life of the sealing components. In addition, most existing equipment relies solely on the physical compression of the airbag to achieve sealing. For rims with slight surface irregularities or attached impurities, the sealing effect is difficult to guarantee, and misjudgments are prone to occur. Summary of the Invention

[0005] Therefore, the purpose of this invention is to provide an airtightness testing device for automobile wheel rims to solve the problems of existing... Technical problems exist in wheel rim airtightness testing equipment, which cannot simultaneously address the issues of ease of loading and unloading, accurate wheel rim positioning, and reliable sealing.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an airtightness testing device for automobile wheel rims, comprising a pair of symmetrically arranged airtight rings; a limiting device disposed between the pair of airtight rings; the limiting device comprising an inner cover and an outer cover, the inner cover and the outer cover being respectively connected to the pair of airtight rings, and the two being sleeved together and rotatable relative to each other; wherein, both the inner cover and the outer cover are provided with openings for inserting or removing the wheel rim, and by rotating the airtight rings, the openings on the inner cover and the outer cover can be adjusted to be in an overlapping state or a misaligned state.

[0007] The present invention is further configured such that each of the airtight rings is provided with a plurality of guide plates along the circumferential direction, and the airtight rings are provided with a driving mechanism for driving the guide plates to move radially.

[0008] The present invention is further configured such that the driving mechanism includes: a driving motor disposed on the outer wall of the airtight ring; and a first transmission shaft driven to rotate by the driving motor. The guide plate cooperates with the first drive shaft, and the rotation of the first drive shaft drives the guide plate to move radially within the airtight ring.

[0009] The invention is further configured such that a pressure plate is slidably disposed on each of the guide plates, and an air bladder is provided on the side of the pressure plate near the rim; by sliding the pressure plate on the guide plate, the air bladder is driven to press against the rim to achieve a seal.

[0010] The invention is further configured such that the guide plate is provided with a plurality of liquid outlets, and the airtight ring is provided with a liquid passage communicating with the liquid outlets, for providing auxiliary sealing oil to the contact area between the wheel rim and the airbag.

[0011] The invention is further configured to include a bearing ring disposed below the limiting device, wherein the two ends of the bearing ring are connected to connecting rods through connecting channels, and the ends of the connecting rods are connected to mounting plates through connecting plates, and the mounting plates are used to fix a rotating motor that drives the airtight ring to rotate.

[0012] The output end of the rotary motor is connected to a rotating rod, and the rotating rod is connected to a second drive shaft. The second drive shaft is threadedly connected to an inner rotating shaft disposed within the rotating shaft. The rotation of the second drive shaft... The inner rotating shaft is driven to move axially, thereby causing the airtight ring to move to match rims of different widths.

[0013] The connecting plate and mounting plate are provided with a liquid passage, which introduces the liquid collected by the bearing ring into the liquid passage inside the airtight ring.

[0014] The airtight ring has a connection hole at its center, which is connected to an external test air source to inflate the sealed space formed by the inner and outer covers to test the airtightness of the wheel rim.

[0015] The inner and outer covers are each provided with a connecting ring, and a pair of connecting rings are nested together. A rotating ring is sleeved around the outer periphery of the rotating shaft, and a support block is provided at the bottom of the rotating shaft in conjunction with the rotating ring.

[0016] In summary, the present invention has the following main beneficial effects: This invention employs a limiting device consisting of an inner and outer cover, with overlapping or misaligned openings on both. This achieves a seamless combination of rapid loading and unloading of the wheel rim and stable limiting. During operation, only the openings need to be aligned during loading and unloading; the remaining testing time is spent with the openings misaligned to reliably confine the wheel rim within the testing chamber, significantly improving testing efficiency and operational convenience. Simultaneously, by setting a guide plate controlled by a drive mechanism within the airtight ring, and further installing a sliding pressure plate with an airbag on the guide plate, the radial position of the wheel rim can be automatically adjusted to ensure precise centering before testing. This not only effectively avoids sealing defects or airbag wear caused by wheel rim misalignment, significantly extending the service life of the sealing components, but also, through the synergistic effect of the airbag's elastic compression and auxiliary oil sealing, forms a double sealing barrier between the wheel rim and the sealing components. Even with minor defects or deposits on the wheel rim surface, excellent sealing performance is guaranteed, thereby greatly improving the accuracy and reliability of airtightness testing. Attached Figure Description

[0017] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the main structure of the present invention; Figure 3 is a schematic diagram of the internal structure of the present invention; Figure 4 is a partial structural schematic diagram of the present invention; Figure 5 is a schematic diagram of the internal structure of the rotating shaft of the present invention; Figure 6 is a top view of the guide plate of the present invention; Figure 7 is a side view of the guide plate of the present invention.

[0018] In the diagram: 1. Airtight ring; 2. Limiting device; 3. Bearing ring; 4. Rotating ring; 5. Rotating shaft; 6. Rotating motor; 7. Mounting plate; 8. Connecting plate; 9. Connecting rod; 10. Connecting hole; 11. Inner cover; 12. Drive motor; 13. First transmission shaft; 14. Connecting ring; 15. Outer cover; 16. Support block; 17. Connecting channel; 18. Inner rotating shaft; 19. Second transmission shaft; 20. Rotating rod; 21. Guide plate; 22. Pressure plate; 23. Airbag; 24. Liquid outlet. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0020] The embodiments of the present invention will now be described.

[0021] As shown in Figure 1-7, the airtightness testing equipment for automobile wheel rims includes a pair of symmetrically arranged airtight rings 1. The two airtight rings 1 are arranged opposite each other from left to right, together forming the main frame of the testing equipment. A limiting device 2 is provided between the two airtight rings 1. This limiting device 2 is used to accommodate the wheel rim to be tested and to initially limit the axial position of the wheel rim.

[0022] Specifically, the limiting device 2 includes an inner cover 11 and an outer cover 15. Both the inner cover 11 and the outer cover 15 are cylindrical structures, with the outer diameter of the inner cover 11 being slightly smaller than the inner diameter of the outer cover 15, allowing the inner cover 11 to be fitted inside the outer cover 15, forming a sleeve connection and allowing relative rotation around the same axis. One end of the inner cover 11 is fixedly connected to the left airtight ring 1, and one end of the outer cover 15 is fixedly connected to the right airtight ring 1. Therefore, when the left and right airtight rings 1 rotate relative to each other, the inner cover 11 and the outer cover 15 will also rotate relative to each other.

[0023] Both the inner cover 11 and the outer cover 15 have openings on their side walls for inserting or removing the wheel rim. The shape and size of these two openings are adapted to the contour of the wheel rim and are typically fan-shaped or rectangular.

[0024] By controlling the rotation angle of the airtight ring 1, the relative positional relationship between the opening on the inner cover 11 and the opening on the outer cover 15 can be adjusted. When it is necessary to install or remove the rim, the airtight ring 1 is driven to rotate, so that the openings on the inner cover 11 and the outer cover 15 completely overlap in the circumferential direction, forming a through loading and unloading channel. At this time, the rim can be placed or removed radially. During the test, the airtight ring 1 is driven to rotate a certain angle again, so that the two openings are misaligned, and the side walls of the inner cover 11 and the outer cover 15 block each other, thereby reliably confining the rim within the annular space formed by the two, preventing the rim from accidentally coming off during the test.

[0025] To accommodate rims of different sizes and ensure precise alignment of the rims within the test chamber, multiple guide plates 21 are uniformly arranged circumferentially inside each airtight ring 1. In this embodiment, four guide plates 21 are preferably arranged in a cross shape within each airtight ring 1. A drive mechanism is provided on the airtight ring 1 to drive these guide plates 21 to move radially. The drive mechanism includes a drive motor 12 fixedly mounted on the outer wall of the airtight ring 1, and a first transmission shaft 13 driven to rotate by the drive motor 12. The first transmission shaft 13 is arranged radially along the airtight ring 1, with one end connected to the output end of the drive motor 12, and the other end extending through the wall of the airtight ring 1 into the interior and engaging with the guide plates 21. Specifically, the first transmission shaft 13 can be a lead screw structure with a threaded hole on the guide plate 21 to engage with it; or, the end of the first transmission shaft 13 is provided with a gear, and the guide plate 21 is provided with a rack that meshes with it. When the drive motor 12 is working, it drives the first transmission shaft 13 to rotate. Through the transmission of the lead screw and nut pair or the gear and rack pair, the rotational motion is converted into the linear motion of the guide plate 21, thereby driving the guide plate 21 to move radially inward or outward along the airtight ring 1. The four guide plates 21 move synchronously and act together on the outer circumference of the rim, which can adjust the center of the rim to coincide with the axis of the airtight ring 1, ensuring the accuracy of subsequent sealing tests.

[0026] Based on the above structure, a pressure plate 22 is also slidably mounted on each guide plate 21. A groove is formed on the radially extending surface of the guide plate 21, and a slider matching the groove is provided on the back of the pressure plate 22, allowing the pressure plate 22 to slide axially relative to the guide plate 21. On the front side of the pressure plate 22, i.e., the side closest to the rim, a ring of airbags 23 is fixedly mounted. The airbags 23 are made of an elastic material, such as rubber, and can be inflated by filling them with gas or liquid at a certain pressure. When the pressure plate 22 slides on the guide plate 21... As it approaches the rim, the airbag 23 first contacts the side of the rim. With further movement of the pressure plate 22, the airbag 23 is compressed and deformed, thus fitting tightly against the bead seat area of ​​the rim, forming a reliable seal. By controlling the sliding stroke of the pressure plate 22, the compression of the airbag 23 can be precisely controlled to adapt to different rim sizes and ensure consistent sealing force.

[0027] To further enhance the sealing effect, this embodiment introduces auxiliary oil sealing technology. Several liquid outlets 24 are provided on each guide plate 21. The positions of these liquid outlets 24 are optimized and are typically located near the airbag 23. Simultaneously, a liquid passage connected to these liquid outlets 24 is machined inside the airtight ring 1. This liquid passage can be achieved through channels within the wall of the airtight ring 1. During testing, after the airbag 23 presses against the rim, sealing oil is pumped into the liquid passage through an external liquid supply system. The oil flows out from the liquid outlets 24, evenly filling the tiny gaps between the airbag 23 and the rim, as well as the microscopic depressions on the rim surface, forming an auxiliary hydraulic sealing layer. This greatly enhances the reliability of the seal, making it particularly suitable for rims with poor surface finish or minor defects.

[0028] This equipment also includes a support ring 3 located below the limiting device 2. The support ring 3 is an annular groove located below the inner cover 11 and the outer cover 15, used to catch sealing oil that may overflow from the seal during testing, preventing oil dripping and contaminating the working environment. Both ends of the support ring 3 are connected to connecting rods 9 via connecting channels 17. The connecting rods 9 act as support arms, extending upwards in the vertical direction. The ends of the connecting rods 9 are fixedly connected to a mounting plate 7 via a connecting plate 8. The mounting plate 7 is used to fix a rotating motor 6 that drives the airtight ring 1 to rotate, and the airtight ring 1 is connected to a rotating shaft 5. The output shaft of the rotating motor 6 is connected to the central shaft of the airtight ring 1, thereby driving the entire airtight ring 1 and the connected inner cover 11 or outer cover 15 to rotate.

[0029] The specific transmission structure for the rotating motor 6 to drive the airtight ring 1 is as follows: The output end of the rotating motor 6 is connected to a rotating rod 20, and the other end of the rotating rod 20 is connected to a second transmission shaft 19. The rotating shaft 5 has a hollow inner cavity, in which an inner rotating shaft 18 is rotatably mounted. One end of the inner rotating shaft 18 is fixedly connected to the airtight ring 1, and the other end has an internal thread. The second transmission shaft 19 extends into the inner cavity of the rotating shaft 5, and its outer surface has an external thread that mates with the internal thread of the inner rotating shaft 18, forming a screw-nut transmission pair. When the first... When the second drive shaft 19 is driven to rotate by the rotating rod 20, it drives the inner rotating shaft 18 to move axially through a threaded connection, thereby causing the airtight ring 1 to undergo axial displacement while rotating. This structure allows the equipment to automatically adjust the axial distance between the two airtight rings 1 according to the actual width of the rim, so as to adapt to rims of different widths and enhance the versatility of the equipment.

[0030] To achieve oil recycling, both the connecting plate 8 and the mounting plate 7 are equipped with internal liquid channels. These liquid channels are interconnected, forming a recovery path from the bearing ring 3 to the airtight ring 1. Specifically, the liquid collected in the bearing ring 3 enters the connecting rod 9 through the connecting channel 17, and then, via the liquid channels inside the connecting plate 8 and the mounting plate 7, is finally introduced into the liquid channel within the airtight ring 1 for use at the outlet 24. This design eliminates the need for complex external piping, making the overall structure of the equipment more compact and aesthetically pleasing.

[0031] A connecting hole 10 is provided at the center of the airtight ring 1. This connecting hole 10 penetrates the wall of the airtight ring 1 and is connected to an air pipe located at the center of the inner rotating shaft 18 inside the airtight ring 1. The central air pipe passes through the inner rotating shaft 18, the first drive shaft 13, and related connecting components in sequence, and finally connects to an external test air source. During testing, high-pressure gas is injected into the sealed space formed by the inner cover 11, the outer cover 15, and the wheel rim through the connecting hole 10 and the central air pipe via the external air source. Then, the pressure change in this space is monitored by detection elements such as pressure sensors to determine whether the airtightness of the wheel rim is qualified.

[0032] In addition, a rotating ring 4 is fitted around the outer periphery of the rotating shaft 5. A support block 16 is provided at the bottom of the rotating shaft 5 to cooperate with the rotating ring 4. The support block 16 is fixedly installed on the base of the equipment or other fixed components (not shown in the figure). When the rotating shaft 5 and its airtight ring 1 rotate and move axially, the rotating ring 4 and the support block 16 form a sliding or rolling engagement. The support block 16 limits and guides the rotational position and range of movement of the rotating shaft 5, ensuring the smoothness and accuracy of the movement.

[0033] To ensure the smoothness and coaxiality of the relative rotation of the inner cover 11 and the outer cover 15, connecting rings 14 are provided at the connection points of the inner cover 11 and the outer cover 15. Specifically, an inner connecting ring is provided at the end of the inner cover 11, and an outer connecting ring is provided at the end of the outer cover 15. The inner connecting ring is nested inside the outer connecting ring, forming a sliding bearing-type support structure. This pair of nested connecting rings 14 not only provides radial support but also reduces frictional resistance during relative rotation, significantly extending the lifespan of the limiting device 2. The service life.

[0034] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the invention, but such modifications, substitutions, and variations are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. Air tightness testing equipment for automobile wheel rims, including: A pair of symmetrically arranged airtight rings (1); A limiting device (2) is provided between the pair of airtight rings (1); The limiting device (2) includes an inner cover (11) and an outer cover (15). The inner cover (11) and the outer cover (15) are respectively connected to a pair of airtight rings (1), and the two are sleeved together and can rotate relative to each other. Both the inner cover (11) and the outer cover (15) are provided with openings for inserting or removing the wheel rim. By rotating the airtight ring (1), the openings on the inner cover (11) and the openings on the outer cover (15) can be adjusted to be in an overlapping or misaligned state. Each of the airtight rings (1) is provided with a plurality of guide plates (21) arranged circumferentially inside, and the airtight rings (1) are provided with a driving mechanism for driving the guide plates (21) to move radially. The drive mechanism includes: The drive motor (12) is installed on the outer wall of the airtight ring (1); The first transmission shaft (13) is driven to rotate by the drive motor (12); The guide plate (21) cooperates with the first transmission shaft (13), and the rotation of the first transmission shaft (13) drives the guide plate (21) to move radially within the airtight ring (1); Each of the guide plates (21) is slidably provided with a pressure plate (22), and the pressure plate (22) is provided with an air bag (23) on the side near the rim; by sliding the pressure plate (22) on the guide plate (21), the air bag (23) is driven to press the rim to achieve a seal; The guide plate (21) is provided with a plurality of liquid outlets (24), and the airtight ring (1) is provided with a liquid passage communicating with the liquid outlets (24) for providing auxiliary sealing oil to the contact area between the rim and the airbag (23).

2. The airtightness testing equipment for automobile wheel rims according to claim 1, characterized in that, It also includes a bearing ring (3) located below the limiting device (2). The two ends of the bearing ring (3) are connected to a connecting rod (9) through a connecting channel (17). The end of the connecting rod (9) is connected to a mounting plate (7) through a connecting plate (8). The mounting plate (7) is used to fix the rotating motor (6) that drives the airtight ring (1) to rotate. The airtight ring (1) is connected to a rotating shaft (5).

3. The airtightness testing equipment for automobile wheel rims according to claim 2, characterized in that, The output end of the rotating motor (6) is connected to a rotating rod (20), and the rotating rod (20) is connected to a second transmission shaft (19). The second transmission shaft (19) is threadedly connected to an inner rotating shaft (18) located in the rotating shaft (5). The rotation of the second transmission shaft (19) drives the inner rotating shaft (18) to move axially, thereby driving the airtight ring (1) to move to match rims of different widths.

4. The airtightness testing equipment for automobile wheel rims according to claim 2 or 3, characterized in that, The connecting plate (8) and the mounting plate (7) are provided with liquid channels, which introduce the liquid collected by the bearing ring (3) into the liquid channel in the airtight ring (1).

5. The airtightness testing equipment for automobile wheel rims according to claim 1, characterized in that, The airtight ring (1) has a connection hole (10) at its center. The connection hole (10) is connected to an external test air source and is used to fill the sealed space formed by the inner cover (11) and the outer cover (15) with air to test the airtightness of the wheel rim.

6. The airtightness testing equipment for automobile wheel rims according to claim 1, characterized in that, The inner cover (11) and the outer cover (15) are both provided with connecting rings (14), and a pair of connecting rings (14) are nested together. A rotating ring (4) is sleeved around the outer periphery of the rotating shaft (5), and a support block (16) is provided at the bottom of the rotating shaft (5) in conjunction with the rotating ring (4).

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