A wheel hub detection special machine

Abstract

The application provides a wheel hub detection special machine, and belongs to the technical field of wheel hub measuring equipment. The technical problem that the existing wheel hub detection equipment is difficult to consider the detection efficiency and the wheel hub quality is solved. The wheel hub detection special machine comprises a workbench, a positioning sleeve in a cylindrical shape is rotationally connected to the upper side of the workbench, the detection special machine further comprises a detection cylinder in a cylindrical shape, two horizontally-opposed stylus assemblies are arranged in the detection cylinder, the lower end of the detection cylinder is fixed to the workbench, the positioning sleeve is coaxially arranged on the periphery of the detection cylinder, the upper part of the detection cylinder extends out of the positioning sleeve, the detection ends of the two stylus assemblies are arranged outward along the radial direction of the detection cylinder and can horizontally extend out of the upper part of the detection cylinder, the outer periphery of the positioning sleeve is provided with an annular groove, an annular air bag is embedded in the groove, the inner wall of the groove is provided with a clearance hole, and the air bag is provided with an air pipe which extends to the outside from the clearance hole. The application can consider the detection efficiency and the product quality.

Description

Technical Field

[0001] This invention belongs to the technical field of wheel hub measuring equipment and relates to a special machine for wheel hub inspection. Background Technology

[0002] The inner diameter and outer diameter of a wheel hub are important parameters of a car wheel. In automated wheel hub manufacturing production lines, specialized testing devices are needed to quickly check whether these parameters of the wheel hub meet the requirements online.

[0003] Chinese patent application CN201920053387.5 discloses a wheel rim runout detection device, including a base plate, a hinged platform fixed on the base plate, a rotating platform hinged to the hinged platform, a lifting spindle sleeved inside the rotating platform, the lifting spindle including a first positioning shaft and a second positioning shaft, the first positioning shaft extending into the center hole of the wheel hub, the lifting spindle having a three-stage stepped hole, a cylinder fixed within the three-stage stepped hole, a pull rod fixed on the cylinder, a pressure plate fixed on the pull rod, a fixing plate between the pressure plate and the wheel hub; a connecting plate fixed within the three-stage stepped hole, the connecting plate fixed on a hydraulic cylinder, the hydraulic cylinder fixed on the base plate; a base fixed to the right end of the base plate, a lifting screw screwed to the base, a slide rail fixed to the top of the lifting screw, a slider slidably connected to the slide rail, a dial indicator fixed to the left end of the slider. This device can achieve wheel hub positioning and detect the outer diameter runout parameters of the wheel hub using a measuring instrument.

[0004] Meanwhile, patent application number CN201910322593.6 discloses a wheel hub inner cavity diameter measuring device, including a left sliding scale, a right sliding scale, a measuring instrument body, a positioning component, and a fastening component. The positioning component is used to insert into the wheel center hole to locate the center position. The right or left sliding scale slides into the lower or upper scale groove. The rightmost end of the right sliding scale and the leftmost end of the left sliding scale respectively contact the inner cavity wall. The fastening component fixes the left and right sliding scales during reading. It can be placed inside the wheel hub cavity to measure the inner diameter of the wheel hub.

[0005] The above equipment can detect the inner diameter of the wheel hub, but it still has shortcomings: the wheel hub is fixed by the lower positioning plate and the upper fixing plate. However, after each test, the upper fixing plate needs to be removed separately, which is inefficient and difficult to meet the requirements of the production line. At the same time, the large pressure of the cylinder can easily cause indentation damage on the surface of the wheel hub, affecting the quality of the wheel hub. Summary of the Invention

[0006] In view of the above-mentioned problems in the existing technology, the present invention provides a special machine for wheel hub inspection. The technical problem to be solved by the present invention is that the existing special machines for inspection are difficult to balance inspection efficiency and wheel hub quality.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] A wheel hub inspection machine includes a worktable with a cylindrical positioning sleeve rotatably connected to its upper side. The inspection machine also includes a cylindrical inspection cylinder containing two horizontally opposed stylus assemblies. The lower end of the inspection cylinder is fixed to the worktable. The positioning sleeve is coaxially sleeved around the inspection cylinder, with the upper part of the inspection cylinder extending out of the positioning sleeve. The inspection ends of the two stylus assemblies are arranged radially outward along the inspection cylinder and can extend horizontally out of the upper part of the inspection cylinder. The outer periphery of the positioning sleeve has an annular groove, and an annular airbag is embedded in the groove. The inner wall of the groove has a clearance hole, and the airbag has a vent pipe that extends through the clearance hole to the outside.

[0009] By setting up a detection cylinder, two horizontally opposed stylus assemblies are installed inside the cylinder. The detection principle of the stylus assemblies can refer to existing technology, that is, by contacting the surface of the wheel hub with the detection end, the runout data is monitored during the rotation of the wheel hub. The lower end of the detection cylinder is fixed to the worktable, while the upper part extends out with a positioning sleeve. The detection end of the stylus assembly extends out of the upper part of the detection cylinder. In this way, when the wheel hub rotates relative to the detection cylinder, the detection ends of the two stylus assemblies can contact the radially opposite positions of the inner wall of the wheel hub respectively and simultaneously record the runout data to identify whether the circumferential radial dimension change is qualified. In order to balance detection efficiency and wheel hub quality, those skilled in the art can generally consider: setting independent pressing devices at intervals above the wheel hub detection station, with a buffer pad on the lower side of the pressing device, so that it is pressed down with appropriate pressure during detection, and independently lifted to make way after detection, without the need for disassembly and to alleviate the indentation phenomenon; or using an automated arm to improve the disassembly and assembly speed and positional accuracy of the fixing plate. This application features an annular groove on the outer periphery of the positioning sleeve, with an annular airbag embedded within the groove. A clearance hole on the inner wall of the groove allows the airbag's vent pipe to extend and connect to an air source. When the wheel hub is fitted onto the positioning sleeve, high-pressure gas can be injected into the airbag, causing it to expand outwards and press against the inner wall of the wheel hub in a flexible contact. Because the airbag is annular and deforms uniformly, it calibrates the wheel hub's concentricity, reducing testing errors. Simultaneously, the static friction from the expanding airbag achieves circumferential positioning of the wheel hub, ensuring stable rotation without slippage and preventing damage to the wheel hub surface. After testing, the wheel hub can be removed simply by retracting the airbag, eliminating the need for component installation and removal, thus balancing testing efficiency and product quality.

[0010] In the aforementioned wheel hub inspection machine, the outer periphery of the positioning sleeve has an annular shoulder, and the airbag is positioned higher than the shoulder. This facilitates the use of the shoulder to provide support for the bottom of the wheel hub, making the vertical position of the wheel hub more stable and accurate, and ensuring the airbag positioning effect and inspection accuracy.

[0011] In the aforementioned wheel hub inspection machine, the lower edge of the groove is positioned close to the upper side of the shoulder. This allows the airbag to contact the wheel hub lower after inflation, providing more space for the detection end of the stylus assembly and optimizing the spatial arrangement.

[0012] In the aforementioned wheel hub inspection machine, the outer circumference of the inspection cylinder is fitted with a rolling bearing whose outer ring tightly fits the inner wall of the positioning sleeve. The upper outer circumference of the inspection cylinder has an annular convex ring, the outer diameter of which is no larger than the outer diameter of the positioning sleeve below. A gap is left between the convex ring and the upper end face of the positioning sleeve. This helps to ensure the coaxial accuracy of the inspection cylinder and the positioning sleeve, while also ensuring the rotational stability of the positioning sleeve. The convex ring also helps to shield the rolling bearing from above, preventing external impurities from entering and affecting the life of the rolling bearing. At the same time, the convex ring can assist in the positioning and support of the wheel hub, making the inspection process stable.

[0013] In the aforementioned wheel hub inspection machine, two horizontally opposed electric cylinders are fixed on the inspection cylinder, and the two contact pin assemblies are fixed to the output ends of the electric cylinders. This allows the contact pin assemblies to move outwards during inspection via the electric cylinders, and to return to their original position inwards after inspection, thus preventing unnecessary wear on the inspection ends of the contact pin assemblies during material feeding.

[0014] In the aforementioned wheel hub inspection machine, the outer periphery of the upper part of the inspection cylinder has two radially penetrating through holes, and the detection end of the stylus assembly is located within these through holes. This design protects the detection end of the stylus assembly by concealing it within the through holes, preventing damage from impacts during loading and unloading and ensuring its service life.

[0015] In the aforementioned wheel hub inspection machine, the stylus assembly includes an L-shaped detection rod and a vertical plate-shaped fixing plate. One end of the detection rod is horizontally outward and forms the detection end of the stylus assembly, while the other end is downward and fixed to the lower end of the fixing plate. A displacement sensor capable of monitoring changes in the distance between the detection rod and the fixing plate is provided between their middle sections. This allows the detection rod to swing relative to the fixing plate when it moves, enabling identification by the displacement sensor. Simultaneously, the displacement sensor and the detection end of the stylus assembly can be vertically offset, facilitating placement in spaces with limited space.

[0016] In the aforementioned wheel hub inspection machine, the positioning sleeve includes an annular support flange and a movable sleeve. The inner edge of the support flange has an inwardly extending and upwardly bent limiting flange, and the inner sidewall of the limiting flange has a limiting groove. The outer edge of the support flange forms the shoulder. The outer periphery of the movable sleeve has an annular and downwardly oriented stepped surface. The lower end of the movable sleeve is vertically slidably inserted into the support flange and supported on the support flange. The stepped surface is spaced apart from the upper side of the support flange and forms the groove. The inspection machine also includes two levers arranged vertically. The lower end of each lever is a hook-shaped protrusion extending inward, and the middle section of the lever is hinged to the movable sleeve. The inner side of the sleeve and the lower end of the lever always tend to swing inward. The hook at the lower end of the lever is vertically engaged in the limiting groove. The detection cylinder includes an upper cylinder and a lower cylinder. The upper cylinder is coaxially slidably sleeved on the outer periphery of the lower cylinder and circumferentially positioned with the lower cylinder. The stylus assembly is connected to the upper cylinder. Each of the fixed plates is fixedly connected with a pull rod arranged along the setting direction of the detection end of the stylus assembly and extending out of the upper cylinder. The outer end of the pull rod is bent downward into a hook shape and can face the upper end of the lever inward. When the pull rod moves horizontally inward with the stylus assembly, the pull rod drives the upper end of the lever to swing inward and causes the lower end of the lever to disengage from the limiting groove. During testing, the hook at the lower end of the lever engages with the limiting groove, positioning the movable sleeve and the support flange vertically. The groove's shape locks in place, allowing the airbag to expand stably outwards, tightening the wheel hub for stable testing. After testing, the stylus assembly retracts. At this point, the pull rod can pull the upper end of the lever, which rotates the movable sleeve one revolution, to swing inwards. This causes the lower end of the lever to disengage from the limiting groove, unlocking the movable sleeve from the support flange. The inflating airbag then pushes the movable sleeve upwards, releasing the airbag pressure and facilitating testing. Remove the hub, ensuring the stylus assembly retracts before removing it. This fundamentally avoids wear on the output end of the stylus assembly during part removal. After unloading and before reloading, depressurize the airbag. At this point, the movable sleeve, without the airbag's support, can fall downwards. The lower end of the lever moves down to the limiting groove. Then, place the hub on the outer circumference of the movable sleeve, causing the stylus assembly to move outwards. Simultaneously, the hook at the lower end of the lever automatically engages and locks in the limiting groove. Then, the airbag inflates to position the hub and rotate it for testing.

[0017] In the aforementioned wheel hub inspection machine, a roller is rotatably connected to the hook at the lower end of the lever, and the axis of the roller is parallel to the swing axis of the lever. This allows the roller to roll along the inner side of the limiting flange when the hook at the lower end of the lever disengages from the limiting groove and moves upward, preventing scratches and damage.

[0018] In the aforementioned wheel hub inspection machine, the convex ring is located on the upper cylinder. Thus, when the movable sleeve, which is unlocked from the support flange, is lifted by the airbag, it can move the upper cylinder upwards, causing the wheel hub to move upwards as well. This indicates that the wheel hub is ready for unloading and also reduces the contact area between the inner wall of the wheel hub and the airbag during unloading, ensuring smooth unloading.

[0019] Compared with the prior art, the advantages of the present invention are as follows:

[0020] When the wheel hub is fitted onto the outer circumference of the positioning sleeve, high-pressure gas can be injected into the air bladder of this specialized wheel hub inspection machine. This causes the air bladder to expand evenly outwards, pressing against and flexibly contacting the inner wall of the wheel hub. Because the air bladder is annular and deforms evenly, it can calibrate the concentricity of the wheel hub, reducing inspection errors. At the same time, the static friction force of the air bladder's expansion contact achieves circumferential positioning of the wheel hub, ensuring stable and non-slip rotation without damaging the wheel hub surface. After inspection, the wheel hub can be removed simply by retracting the air bladder, without the need for installing or removing parts, thus balancing inspection efficiency and product quality. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of this embodiment.

[0022] Figure 2 yes Figure 1 Enlarged view of part A in the image.

[0023] Figure 3 This is a three-dimensional structural diagram of the airbag in this embodiment.

[0024] Figure 4 This is a three-dimensional structural diagram of the stylus assembly in this embodiment.

[0025] Figure 5 This is a top view of the structure of this embodiment.

[0026] Figure 6 yes Figure 5 Partial cross-sectional view of BB in the image.

[0027] Figure 7 yes Figure 6 Enlarged view of section C in the image.

[0028] Figure 8 This is a partial cross-sectional view of the wheel hub in the present embodiment.

[0029] In the diagram, 1. Workbench; 2. Positioning sleeve; 21. Groove; 22. Clearance hole; 23. Shoulder; 24. Support flange; 241. Limiting flange; 242. Limiting groove; 25. Movable sleeve; 251. Stepped surface; 3. Detection cylinder; 31. Convex ring; 32. Through hole; 33. Upper cylinder; 34. Lower cylinder; 4. Stylus assembly; 41. Detection rod; 42. Fixing plate; 43. Displacement sensor; 5. Airbag; 51. Vent pipe; 6. Rolling bearing; 7. Electric cylinder; 8. Lever; 81. Roller; 9. Pull rod. Detailed Implementation

[0030] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0031] like Figure 1 As shown, this wheel hub inspection machine includes a workbench 1, and a cylindrical positioning sleeve 2 is rotatably connected to the upper side of the workbench 1. The inspection machine also includes a cylindrical inspection cylinder 3. The positioning sleeve 2 is coaxially sleeved around the inspection cylinder 3. The upper part of the inspection cylinder 3 extends out of the positioning sleeve 2. The outer periphery of the positioning sleeve 2 has an annular shoulder 23. The positioning sleeve 2 is rotated by a motor through an existing reduction gear assembly.

[0032] like Figure 2 As shown, the detection cylinder 3 is provided with two horizontally opposed stylus assemblies 4. The detection ends of the two stylus assemblies 4 are arranged radially outward along the detection cylinder 3 and can extend horizontally out of the upper part of the detection cylinder 3. The outer periphery of the positioning sleeve 2 has an annular groove 21. The inner wall of the groove 21 has a clearance hole 22. The lower edge of the groove 21 is arranged near the upper side of the shoulder 23. The upper outer periphery of the detection cylinder 3 has an annular convex ring 31. The outer diameter of the convex ring 31 is not greater than the outer diameter of the positioning sleeve 2 below.

[0033] like Figure 3 As shown, this wheel hub inspection machine also includes an annular airbag 5, which is embedded in the groove 21. The airbag 5 has a vent pipe 51 that can pass through the clearance hole 22 and extend to the outside. Two horizontally opposed electric cylinders 7 are fixed on the inspection cylinder 3. The electric cylinders 7 are existing small-sized components to make the structure compact. Two contact pin assemblies 4 are fixed to the output end of the electric cylinders 7.

[0034] like Figure 4 As shown, the stylus assembly 4 includes an L-shaped detection rod 41 and a vertical plate-shaped fixing plate 42. One end of the detection rod 41 is horizontally outward and forms the detection end of the stylus assembly 4. The other end of the detection rod 41 is downward and fixed to the lower end of the fixing plate 42. An existing displacement sensor 43 capable of monitoring the change in the distance between the detection rod 41 and the fixing plate 42 is provided between the middle sections. The data directly measured by the displacement sensor 43 can be converted into the runout data of the inner diameter of the wheel hub.

[0035] like Figure 5 , Figure 6 As shown, the lower end of the detection cylinder 3 is fixed to the workbench 1, and the position of the airbag 5 is higher than the position of the shoulder 23. A rolling bearing 6 with an outer ring that fits tightly against the inner wall of the positioning sleeve 2 is fitted around the outer periphery of the detection cylinder 3. A gap is left between the convex ring 31 facing downward and the upper end face of the positioning sleeve 2. The upper outer periphery of the detection cylinder 3 has two through holes 32 that radially penetrate the convex ring 31, and the detection ends of the two stylus assemblies 4 are respectively located in the two through holes 32.

[0036] like Figure 7 , Figure 8 As shown, the positioning sleeve 2 includes an annular support flange 24 and a movable sleeve 25. The inner edge of the support flange 24 has an inwardly extending and upwardly bent limiting flange 241. The inner sidewall of the limiting flange 241 has a limiting groove 242. The outer edge of the support flange 24 forms a shoulder 23. The outer periphery of the movable sleeve 25 has an annular and downwardly facing stepped surface 251. The lower end of the movable sleeve 25 is vertically slidably inserted into the support flange 24 and supported on the support flange 24 through an existing spline structure. The stepped surface 251 is spaced apart from the upper side of the support flange 24 and forms a groove 21. The special machine also includes two levers 8 arranged vertically. The lower end of the lever 8 is a hook shape that protrudes inward. The middle section of the lever 8 is hinged to the inner side of the movable sleeve 25, and an existing torsion spring is provided at the hinge of the lever 8 so that the lower end of the lever 8 always has a tendency to swing inward. The hook at the lower end of the lever 8 is vertically engaged in the limiting groove 242. The detection cylinder 3 includes an upper cylinder 33 and a lower cylinder 34. The upper cylinder 33 is coaxially slidably sleeved on the outer periphery of the lower cylinder 34 through a spline structure and is circumferentially positioned with the lower cylinder 34. The stylus assembly 4 is connected to the upper cylinder 33, and the protruding ring 31 is located on the upper cylinder 33. Each fixed plate 42 is fixedly connected to a pull rod 9, which is arranged along the setting direction of the detection end of the stylus assembly 4 and extends out of the upper cylinder 33. The outer end of the pull rod 9 is bent downward into a hook shape and faces inward to be opposite to the upper end of the lever 8. When the pull rod 9 moves horizontally inward with the stylus assembly 4, the pull rod 9 drives the upper end of the lever 8 to swing inward and causes the lower end of the lever 8 to disengage from the limiting groove 242. The hook at the lower end of the lever 8 is rotatably connected to a roller 81, and the axis of the roller 81 is parallel to the swing axis of the lever 8.

[0037] During testing, the wheel hub can first be fitted onto the outer circumference of the positioning sleeve 2 using the existing feeding device. Then, high-pressure gas can be injected into the air bladder 5 using an air pump or other air source, causing the air bladder 5 to expand outward and press against the inner wall of the wheel hub, making flexible contact. This achieves circumferential positioning of the wheel hub and the positioning sleeve 2. Afterward, the positioning sleeve 2 drives the wheel hub to rotate one revolution. The detection end of the stylus assembly 4 inside the detection cylinder 3 contacts the inner wall of the wheel hub to detect whether the runout data meets the standard. After the test is completed, the wheel hub can be removed by controlling the retraction of the air bladder 5.

[0038] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A special machine for inspecting wheel hubs, comprising a workbench (1), wherein a cylindrical positioning sleeve (2) is rotatably connected to the upper side of the workbench (1), characterized in that, The testing machine also includes a cylindrical testing cylinder (3), which contains two horizontally opposed stylus assemblies (4). The lower end of the testing cylinder (3) is fixed to the workbench (1). The positioning sleeve (2) is coaxially sleeved around the periphery of the testing cylinder (3), and the upper part of the testing cylinder (3) extends out of the positioning sleeve (2). The testing ends of the two stylus assemblies (4) are arranged radially outward along the testing cylinder (3) and can extend horizontally out of the upper part of the testing cylinder (3). The outer periphery of the positioning sleeve (2) has an annular groove (21). An annular airbag (5) is embedded in the groove (21). The inner wall of the groove (21) has a clearance hole (22). The airbag (5) has a vent pipe (51) that passes through the clearance hole (22) and extends to the outside.The stylus assembly (4) includes an L-shaped detection rod (41) and a vertical plate-shaped fixing plate (42). One end of the detection rod (41) is horizontally outward and forms the detection end of the stylus assembly (4). The other end of the detection rod (41) is downward and fixed to the lower end of the fixing plate (42). A displacement sensor (43) capable of monitoring the change in the distance between the detection rod (41) and the fixing plate (42) is provided between the middle sections of the two. The outer periphery of the positioning sleeve (2) has an annular shoulder (23). The position of the airbag (5) is higher than the position of the shoulder (23). The positioning sleeve (2) includes an annular support flange (24) and a movable sleeve (25). The inner edge of the support flange (24) has an inwardly extending and upwardly bent limiting flange (241). The inner sidewall of the limiting flange (241) has a limiting groove (242). The outer edge of the support flange (24) forms the shoulder (23). The outer periphery of the movable sleeve (25) has an annular and downwardly arranged stepped surface (251). The lower end of the movable sleeve (25) is vertically slidably inserted into the support flange (24) and supported on the support flange (24). The stepped surface (251) is spaced apart from the upper side of the supporting flange (24) and forms the groove (21). The testing machine also includes two levers (8) arranged vertically. The lower end of the lever (8) is hook-shaped and protrudes inward. The middle section of the lever (8) is hinged to the inner side of the movable sleeve (25) and the lower end of the lever (8) always has a tendency to swing inward. The hook at the lower end of the lever (8) is vertically engaged in the limiting groove (242). The testing cylinder (3) includes an upper cylinder (33) and a lower cylinder (34). The upper cylinder (33) is coaxially slidably sleeved on the lower cylinder. (34) The outer periphery is circumferentially positioned with the lower cylinder (34). The stylus assembly (4) is connected to the upper cylinder (33). Each fixing plate (42) is fixedly connected with a pull rod (9) arranged along the setting direction of the detection end of the stylus assembly (4) and extending out of the upper cylinder (33). The outer end of the pull rod (9) is bent downward into a hook shape and can be opposite to the upper end of the lever (8) inward. When the pull rod (9) moves horizontally inward with the stylus assembly (4), the pull rod (9) drives the upper end of the lever (8) to swing inward and causes the lower end of the lever (8) to disengage from the limiting groove (242).

2. The wheel hub inspection machine according to claim 1, characterized in that, The lower edge of the groove (21) is arranged near the upper side of the shoulder (23).

3. The wheel hub inspection machine according to claim 1 or 2, characterized in that, The outer circumference of the detection cylinder (3) is fitted with a rolling bearing (6) whose outer ring is tightly fitted with the inner wall of the positioning sleeve (2). The upper outer circumference of the detection cylinder (3) has an annular convex ring (31). The outer diameter of the convex ring (31) is not greater than the outer diameter of the positioning sleeve (2) below. A gap is left between the convex ring (31) facing downward and the upper end face of the positioning sleeve (2).

4. The wheel hub inspection machine according to claim 3, characterized in that, Two horizontally opposed electric cylinders (7) are fixed on the detection cylinder (3), and the two contact pin assemblies (4) are fixed to the output end of the electric cylinders (7).

5. The wheel hub inspection machine according to claim 1 or 2, characterized in that, The outer periphery of the upper part of the detection cylinder (3) has two radially penetrating through holes (32), and the detection end of the stylus assembly (4) is located in the through holes (32).

6. The wheel hub inspection machine according to claim 1 or 2, characterized in that, The hook at the lower end of the lever (8) is rotatably connected to a roller (81), and the axis of the roller (81) is parallel to the swing axis of the lever (8).

7. The wheel hub inspection machine according to claim 4, characterized in that, The convex ring (31) is located on the upper cylinder (33).

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