A universal inspection tool for automobile axle housing assembly

Abstract

The present invention belongs to the field of automobile aperture gauges, and in particular relates to a universal gauge for automobile axle housing assemblies. It comprises a detection platform and concentric positioning parts fixed on the left and right sides of the end face of the detection platform for positioning the axle housing assembly respectively; a fixed limiter for supporting and conveying the axle housing assembly and a symmetrically arranged laser detection component are provided at the middle position of the upper end face of the detection platform. The present invention uses laser displacement sensors on both sides symmetrically distributed on the outer wall of the shaft tube to collect data of the same point in real time and transmit it synchronously to the analysis system, directly calculate the diameter deviation and coaxiality, and fully realize efficient and accurate measurement. The flexible adjustment capability of the present invention can break through the "one type, one tool" limitation, greatly reduce hardware investment and maintenance costs, and the symmetrical design of each pair of movable connecting rods offsets the single-point force offset, achieves uniform support for the inner wall of the shaft hole, and forces the shaft hole to be corrected to be coaxial with the positioning cone.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile aperture inspection tools, and in particular relates to a universal inspection tool for automobile axle housing assemblies. Background Art

[0002] As the core component of the axle system, the manufacturing precision of the automobile axle housing assembly directly affects the vehicle's power transmission efficiency, load-bearing capacity and driving safety. In the field of commercial vehicles and passenger vehicles, the axle housing assembly must meet complex geometric tolerance requirements (such as axis coaxiality, end face perpendicularity, installation hole accuracy, etc.) to ensure precise coordination with components such as differentials and half-axles. Traditional inspection methods mainly rely on special inspection fixtures, three-dimensional coordinate measuring machines or manual visual inspection, but these methods face significant limitations under the trend of flexible production.

[0003] Traditional bridge housing axis hole size inspections often use a "one-for-one" special inspection fixture, that is, a customized inspection fixture structure for a specific bridge housing model or type. Although this type of inspection fixture can achieve rapid clamping and qualitative inspection, the following problems still exist: 1. Due to the variety of bridge housing assembly models, the cost of using a "one-for-one" special inspection fixture is relatively high; and bridge housing assemblies are often large in size. Before inspection, they need to be fixed with positioning parts, and then limited by coaxial limiters at the shaft hole position. After ensuring the limit is stable, the diameter length of the shaft hole at different positions is finally measured by laser inspection equipment. When the shaft hole position is coaxially limited, the coaxial limiter extending into the interior is usually slightly smaller than the inner diameter of the bridge housing assembly shaft hole, resulting in the coaxial limiter being unable to adjust the shaft hole position axis to be parallel to it, resulting in a certain error when the laser inspection instrument is measured, affecting the measurement results.

[0004] 2. The current bridge housing assembly is not convenient to move after being placed on the positioning platform. Due to the position offset during the placement process, the detection points on the left and right sides are not synchronized when measuring its shaft hole, making it impossible to compare the detection results in real time, affecting the judgment of the detection results.

[0005] Therefore, in order to facilitate comparison and judgment of the test results and improve the accuracy of the test results of the outer diameter of the shaft hole of the axle housing assembly, the present invention provides a universal inspection tool for automobile axle housing assemblies. Summary of the Invention

[0006] In view of the above problems, the embodiments of the present application provide a universal inspection tool for automobile axle housing assemblies, which solves the problems of low inspection accuracy and inconvenience in comparing and judging inspection results of current dedicated inspection tools.

[0007] In order to achieve the above-mentioned purpose, the embodiment of the present application provides the following technical solutions: a universal inspection fixture for automobile axle housing assemblies, comprising an inspection platform and concentric positioning parts fixed on the left and right sides of the end face of the inspection platform for positioning the axle housing assembly respectively; a fixed limit part for supporting and transporting the axle housing assembly is provided at the middle position of the upper end face of the inspection platform, the fixed limit part comprises a positioning platform for dynamically supporting the axle housing assembly placed at the upper end and a positioning assembly provided at the lower end of the positioning platform, the positioning platform coaxially positions and fixes the inner wall of the middle part of the axle housing assembly by means of multi-point synchronous outward expansion and contact, and the positioning assembly is used to drive the positioning platform to move back and forth on the upper end face of the inspection platform.

[0008] Laser detection components that slide in left and right directions and are used to detect the outer diameter of the bridge housing assembly are respectively provided on the detection platform between the fixed limit part and the concentric positioning part.

[0009] The concentric positioning parts include a table rail seat fixed to the detection platform by bolts; the upper end of the table rail seat is provided with a vertical base through an electric slider; the end surfaces of the vertical bases on the two concentric positioning parts that are close to each other slide up and down respectively and are provided with concentric drive components for extending into the shaft hole of the bridge housing assembly to complete multi-point separate and synchronous support positioning.

[0010] According to a favorable embodiment, the upper end of the positioning platform is a disc-shaped structure, and two sink grooves are symmetrically provided on the upper end surface of the positioning platform. A bidirectional threaded rod is rotatably arranged inside the sink groove, and a driven bevel gear is fixedly arranged in the middle of the bidirectional threaded rod. The two threaded sections of the bidirectional threaded rod are each provided with an L-shaped push rod, and the other end of the L-shaped push rod is slidably arranged inside the sink groove; a limit spring is provided on the outer wall of the bidirectional threaded rod between the L-shaped push rod and the end of the bidirectional threaded rod; a dual-axis motor is also fixedly arranged inside the positioning platform, and the two driving shafts of the dual-axis motor are both connected to the active bevel gear, and the active bevel gear is meshed with the driven bevel gear at the corresponding position.

[0011] According to an advantageous embodiment, a telescopic platform is telescopically provided at the center of the positioning platform, a dynamic detector is provided inside the telescopic platform, and the dynamic detector is electrically connected to the dual-axis motor.

[0012] According to a favorable embodiment, a rectangular track frame is provided at one end of the vertical base near the fixed limit member, the interior of the rectangular track frame is a cavity structure, and a multi-stage electric telescopic rod is provided therein, the top of the multi-stage electric telescopic rod is connected to a T-shaped rod, and strip holes are provided on both sides of the rectangular track frame, and a limit sleeve is provided for sliding inside the strip hole, and a locking column with a spring sleeved on the surface is slidably provided inside the limit sleeve, and a wedge surface is provided at one end of the locking column that cooperates with the transverse section of the T-shaped rod; a U-shaped socket is provided for sliding outside the rectangular track frame, and the other end of the locking column passes through the strip hole and faces the inner wall of the U-shaped socket; the inner wall of the U-shaped socket is symmetrically provided with spring telescopic rods, and one end of the spring telescopic rod is in contact with the circumferential outer wall of the locking column.

[0013] According to a favorable embodiment, the concentric drive assembly includes a cylinder seat fixed on a U-shaped base by bolts, a telescopic cylinder is installed on the cylinder seat, the end of the telescopic cylinder is connected to a fixed sleeve, and the interior of the fixed sleeve is connected to a single-axis motor, the output end of the single-axis motor is connected to a lead screw threaded rod, and a one-way assembly is connected to the lead screw threaded rod, and two symmetrical side thrust plates are provided on the outer wall of the fixed sleeve for rotation through a pin shaft, and the side thrust plates are connected to the one-way assembly by a connecting rod.

[0014] According to an advantageous embodiment, one end of the fixing sleeve facing the fixing limiter is threadedly connected with a positioning cone for guiding the insertion into the axial hole of the axle housing assembly.

[0015] According to a favorable embodiment, the circumferential outer wall of the fixed sleeve on one side close to the fixed limit piece is also evenly provided with through holes, and the end of the screw threaded rod close to the positioning cone is also connected to a gear set, and a one-way component is also provided inside the gear set. The outer wall of the gear set is connected to a bidirectional screw rod corresponding to the number of through holes, and two relative movable links are threadedly connected to the bidirectional screw rod. One end of the movable link passing through the through hole is connected to an arc-shaped external support block, and a limiting block hinged to all the movable links is provided inside the fixed sleeve.

[0016] According to an advantageous embodiment, balls are provided on the end of the L-shaped push rod in contact with the bridge housing assembly, both ends of the transverse section of the T-shaped rod, and the outer wall of the arc-shaped outer support block.

[0017] According to an advantageous embodiment, a rubber pad is provided on the outer wall of one end of the side thrust plate facing the axle housing assembly to be inspected.

[0018] Compared with the prior art, a universal inspection fixture for automobile axle housing assemblies provided by an embodiment of the present invention has the following beneficial effects: 1. The positioning platform in the present invention drives a bidirectional threaded rod through a dual-axis motor to control the L-shaped push rod to perform four-point synchronous outward expansion positioning on the middle inner wall of the axle housing, and the linkage design of the extension and lowering platform and the dynamic detector monitors the position of the axle housing assembly in real time and triggers the dual-axis motor adjustment to ensure that the axis of the axle housing is coaxial with the positioning platform, eliminating the measurement error caused by clamping offset, and after the concentric drive assembly is inserted into the shaft hole, multiple bidirectional screw rods are driven by the gear set to make the arc-shaped outer support block expand outward synchronously, and the symmetrical design of each pair of movable connecting rods offsets the single-point force offset, realizes uniform support of the inner wall of the shaft hole, and forces the shaft hole to be corrected to be coaxial with the positioning cone.

[0019] 2. The positioning platform of the present invention dynamically supports the bridge housing assembly while simultaneously performing multi-point synchronous outward expansion coaxial positioning on the middle inner wall of the bridge housing assembly, and uses the concentric drive component to complete multi-point synchronous support positioning on the inside of the shaft hole extending into the bridge housing assembly. With the mutual cooperation of the positioning platform and the concentric drive component, the concentric self-correction of the automobile bridge housing is completed, further improving the detection effect of the laser detection component.

[0020] 3. The flexible adjustment capability of the present invention can significantly reduce hardware investment and maintenance costs, breaking through the limitation of "one model, one tool". The vertical base is adaptively adjusted in height and horizontal position through an electric slider and a multi-stage electric telescopic rod. Combined with the elastic locking mechanism of the U-shaped card seat, it is compatible with bridge housing models with different wheelbases and apertures. The arc-shaped outer support block adopts a ball contact and rubber pad design, combined with the telescopic adjustment of the connecting rod, to improve the aperture tolerance coverage of the bridge housing shaft hole.

[0021] 4. The present invention uses laser displacement sensors on both sides to be symmetrically distributed on the outer wall of the shaft tube, collects data from the same point in real time and transmits it synchronously to the analysis system, directly calculates diameter deviation and coaxiality, and fully realizes efficient and accurate measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional structural diagram of the present invention.

[0023] Figure 2 This is a top view of the positioning platform of the present invention.

[0024] Figure 3 It is a side sectional view between the positioning platform and the bridge housing assembly of the present invention.

[0025] Figure 4 It is a structural schematic diagram of the vertical base of the present invention.

[0026] Figure 5 For the present invention Figure 4 The structural state change diagram at point A in .

[0027] Figure 6 It is a side view of the concentric drive assembly of the present invention.

[0028] Figure 7 For the present invention Figure 6 The structural state change diagram at point B in .

[0029] Reference numerals in the figure: 1, detection platform; 2, concentric positioning member; 3, fixed limit member; 4, laser detection component; 31, positioning platform; 32, positioning assembly; 21, table rail seat; 22, vertical base; 23, concentric drive assembly; 311, bidirectional threaded rod; 312, driven bevel gear; 313, L-shaped push rod; 314, dual-axis motor; 315, driving bevel gear; 316, extension and lowering platform; 221, rectangular track frame; 222, multi-stage electric telescopic rod; 223 , T-bar; 224, limit sleeve; 225, locking column; 226, U-shaped card seat; 227, spring telescopic rod; 231, cylinder seat; 232, telescopic cylinder; 233, fixed sleeve; 234, single-axis motor; 235, lead screw threaded rod; 236, one-way assembly; 237, side thrust plate; 238, connecting rod; 239, positioning cone; 241, gear set; 242, two-way lead screw; 243, movable connecting rod; 244, arc-shaped outer support block; 245, limit card block; DETAILED DESCRIPTION

[0030] The following is combined with Figure 1 -Attached Figure 7 This application is described in further detail.

[0031] See also Figure 1 A universal inspection fixture for an automobile axle housing assembly comprises an inspection platform 1 and concentric positioning members 2 fixed on the left and right sides of the upper end surface of the inspection platform 1 for positioning the axle housing assembly; a fixed limit member 3 for supporting and conveying the axle housing assembly is provided at the middle position of the upper end surface of the inspection platform 1; the fixed limit member 3 comprises a positioning platform 31 for dynamically supporting the axle housing assembly placed on the upper end and a positioning assembly 32 provided at the lower end of the positioning platform 31; the positioning platform 31 coaxially positions and fixes the inner wall of the middle part of the axle housing assembly by means of multi-point synchronous outward expansion and resistance, and the positioning assembly 32 is used to drive the positioning platform 31 to move back and forth in front of the upper end surface of the inspection platform 1; a laser detection component 4 for sliding in the left and right directions and for detecting the outer diameter of the axle housing assembly is respectively provided on the inspection platform 1 between the fixed limit member 3 and the concentric positioning member 2.

[0032] During specific use, the bridge housing assembly is first fixedly lifted to the upper end surface of the positioning platform 31 by the existing clamp-type lifting device, and the position of the bridge housing assembly is corrected as much as possible through appropriate dynamic adjustment. When the bridge housing assembly is completely placed on the upper end surface of the positioning platform 31 by the lifting device, the concentric positioning between the middle part of the bridge housing assembly and the positioning platform 31 is completed by the internal structure of the positioning platform 31, and then the shaft tubes on both sides of the bridge housing assembly are limited by the clamping parts on the positioning assembly 32; after limiting, the bridge housing assembly is driven by the positioning assembly 32 to move to the middle position of the detection platform 1, so that the two axial holes of the bridge housing assembly are respectively aligned with the concentric positioning parts 2 at the corresponding positions, and then the concentric positioning part 2 is inserted into the inside of the stop shaft hole to further complete the concentric limiting; finally, the outer wall of the shaft tube of the bridge housing assembly is inspected by the laser detection component 4.

[0033] The detection principle of the laser detection component 4 used in this application is to arrange two laser displacement sensors symmetrically along the circumference of the pipeline, and emit lasers to irradiate the distance to the surface object. Since the upper and lower laser displacement sensors are symmetrically distributed, the total distance between the two laser displacement sensors is subtracted from the distances between the two laser beams irradiating the surface object through data analysis to obtain the diameter of the outer wall of the shaft tube here. At the same time, the shaft tubes at both ends of the bridge housing assembly are symmetrically distributed. The data after measuring the same points on both sides can be further analyzed to obtain the actual manufacturing tolerances of the outer walls of the two shaft tubes.

[0034] See also Figure 2 The upper end of the positioning platform 31 is a disc-shaped structure, and two sink grooves are symmetrically provided on the upper end surface of the positioning platform 31. A bidirectional threaded rod 311 is rotatably provided inside the sink groove, and a driven bevel gear 312 is fixedly provided in the middle of the bidirectional threaded rod 311. The two threaded sections on the bidirectional threaded rod 311 are both provided with an L-shaped push rod 313, and a ball is provided at one end of the L-shaped push rod 313 that contacts the bridge housing assembly; the other end of the L-shaped push rod 313 is slidably provided inside the sink groove; a limit spring is sleeved between the L-shaped push rod 313 and the end of the bidirectional threaded rod 311; a dual-axis motor 314 is also fixedly provided inside the positioning platform 31, and the two driving shafts of the dual-axis motor 314 are both connected to the driving bevel gear 315, and the driving bevel gear 315 is meshed with the driven bevel gear 312 at the corresponding position.

[0035] See also Figure 3 The center position of the positioning platform 31 is telescopically provided with an extension and lowering platform 316 , and a dynamic detector is provided inside the extension and lowering platform 316 , and the dynamic detector is electrically connected to the dual-axis motor 314 .

[0036] In order to adaptively adjust the coaxiality between the middle part of the bridge housing assembly and the positioning platform 31, and ensure the accuracy of its subsequent detection results; in the process of completely placing the bridge housing assembly on the upper end surface of the positioning platform 31 through the sling, the extending and lowering platform 316 will first fit with the middle inner wall of the bridge housing assembly. As the bridge housing assembly descends, it will drive the extending and lowering platform 316 to move, and further the dynamic detector will move. During its movement, it will control the dual-axis motor 314 to start, and the dual-axis motor 314 will start to indirectly drive the two-way threaded rods 311 on the front and rear sides to rotate. During its rotation, it will control the two L-shaped push rods 313 on the same two-way threaded rod 311 to move away from each other until they hit the middle inner wall of the bridge housing assembly. By setting a four-point synchronous outward expansion limit method on the front and rear sides, it is ensured that the middle part of the bridge housing assembly is coaxially positioned and fixed with the positioning platform 31, further improving the accuracy of the subsequent detection results.

[0037] See also Figure 2 In order to further ensure that the L-shaped push rods 313 are away from each other and expanded outward, the middle axis of the bridge housing assembly is adjusted to be coaxial with the positioning platform 31, and a ball bearing is provided on the upper end surface of the extending and lowering platform 316 to reduce the friction resistance when the bridge housing assembly and the extending and lowering platform 316 move relative to each other.

[0038] See also Figure 1 The concentric positioning member 2 includes a table rail seat 21 fixed to the detection platform 1 by bolts; the upper end of the table rail seat 21 is provided with a vertical base 22 through an electric slider; the end surfaces of the vertical bases 22 on the two concentric positioning members 2 that are close to each other slide up and down respectively and are provided with a concentric drive component 23 for extending into the shaft hole of the bridge housing assembly and completing multi-point synchronous support positioning.

[0039] Specifically, while the positioning platform 31 dynamically supports the bridge housing assembly, it also performs multi-point synchronous outward expansion coaxial positioning on the middle inner wall of the bridge housing assembly, and with the help of the concentric drive component 23, completes multi-point synchronous support positioning on the inside of the axial hole extending into the bridge housing assembly. With the mutual cooperation of the positioning platform 31 and the concentric drive component 23, the concentric self-correction of the automobile bridge housing is completed, further improving the detection effect of the laser detection component 4.

[0040] After the bridge housing assembly is fixed and lifted to the upper end surface of the positioning platform 31 by the clamp-type sling to complete the multi-point synchronous outward expansion coaxial positioning, the clamp-type sling will be withdrawn. At this time, the bridge housing assembly is completely placed on the upper end surface of the positioning platform 31. Due to the overall weight of the bridge housing assembly, both ends of its shaft tube also need to be limited by the clamping parts on the positioning assembly 32. Then when the concentric drive assembly 23 is extended to the inner wall of the shaft hole of the bridge housing assembly, if the shaft hole and the concentric drive assembly 23 are not coaxial, the concentric drive assembly 23 itself needs to be adjusted to a coaxial position; for this reason, the vertical base 22 in the present invention needs to be adaptively structurally designed.

[0041] See also Figure 4 and Figure 5 The top of the multi-stage electric telescopic rod 222 is connected to the T-shaped rod 223, and the two ends of the transverse section of the T-shaped rod 223 are provided with ball bearings.

[0042] When the concentric drive assembly 23 needs to be adaptively adjusted in position, it will drive the U-shaped card seat 226 to move up and down within a small range. After the adjustment is completed, the multi-stage electric telescopic rod 222 is pulled down to drive the T-shaped rod 223 to move down and cooperate with the inclined surfaces of the locking columns 225 on both sides, driving the two locking columns 225 away from each other, thereby causing the locking columns 225 to contact the corresponding inner walls of the U-shaped card seat 226, completing the position locking of the U-shaped card seat 226 (its adaptive adjustment state is shown in the figure). Figure 5 shown).

[0043] See also Figure 1 、 Figure 6 and Figure 7 The concentric drive assembly 23 includes a cylinder seat 231 fixed on the U-shaped base 226 by bolts, and a telescopic cylinder 232 is installed on the cylinder seat 231. The end of the telescopic cylinder 232 is connected to a fixed sleeve 233, and the interior of the fixed sleeve 233 is connected to a single-axis motor 234, and the output end of the single-axis motor 234 is connected to a screw threaded rod 235, and the screw threaded rod 235 is connected to a one-way component 236. Two symmetrical side push plates 237 are provided on the outer wall of the fixed sleeve 233 through a pin shaft. The side push plates 237 are connected to the one-way component 236 by a connecting rod 238, and a rubber pad is provided on the outer wall of the side push plate 237 facing the bridge housing assembly to be tested; the fixed sleeve 233 is threadedly connected to one end facing the fixed limit member 3 with a positioning cone 239 for guiding the insertion into the shaft hole of the bridge housing assembly; when the model difference of the bridge housing assembly is large, the positioning cone 239 of different models can be replaced first.

[0044] Specifically, when the concentric drive assemblies 23 on both sides are synchronously inserted into the shaft hole of the axle housing assembly, in order to ensure that they can be inserted, the diameter of the positioning cone 239 is usually slightly smaller than the inner diameter of the shaft hole. The purpose of setting the positioning cone 239 is to play a guiding role. After the positioning cone 239 is inserted, the single-axis motor 234 rotates forward to control the side push plates 237 on both sides to stand up (the state diagram is as shown in FIG. Figure 7 As shown), the insertion depth of both ends is limited to keep them consistent, which is beneficial to the accuracy of the detection results on both sides. In order to ensure that the side push plate 237 is in a vertical state after being erected, a limit cylinder can be set on the outer wall of the fixed sleeve 233.

[0045] See also Figure 7 The fixed sleeve 233 is evenly provided with through holes on the circumferential outer wall of one side near the fixed limit member 3, and the end of the screw threaded rod 235 near the positioning cone 239 is also connected to a gear set 241, and a one-way component 236 is also provided inside the gear set 241. The outer wall of the gear set 241 is connected to a bidirectional screw rod 242 corresponding to the number of through holes. Two relative movable links 243 are threadedly connected to the bidirectional screw rod 242, and one end of the movable link 243 passing through the through hole is connected to an arc-shaped external support block 244, and a ball is provided on the outer wall of the arc-shaped external support block 244; the interior of the fixed sleeve 233 is provided with a limiting block 245 hinged to all movable links 243.

[0046] When the concentric drive components 23 on both sides are synchronously inserted into the specified positions inside the axial holes of the bridge housing assembly, the single-axis motor 234 continues to rotate forward. At this time, the one-way component 236 connected to the connecting rod 238 controls the screw threaded rod 235 and does not interact with it. The continuous forward rotation of the screw threaded rod 235 drives the gear set 241 to work, and the gear set 241 simultaneously drives multiple bidirectional screws 242 to rotate. During the rotation process, it will drive the angle between the two movable connecting rods 243 inside the same through hole to decrease until it hits the inner wall of the axial hole, keeping the axial hole coaxial with the concentric drive component 23.

[0047] See also Figure 7The connection method between the two-way screw rod 242 and the movable link 243 is to provide a displacement groove inside the movable link 243, and then set a connecting block inside the displacement groove to connect with the two-way screw rod 242 through the connecting block; it can ensure that when the gear set 241 drives multiple two-way screw rods 242 to rotate at the same time, the angle between the two movable links 243 inside the same through hole can be controlled to decrease, so that the outer wall of the arc-shaped external support block 244 is against the inner wall of the shaft hole of the bridge housing assembly, and further, multiple arc-shaped external support blocks 244 equally divided on the circumference are used to complete the multi-point synchronous adjustment to control the axis of the shaft hole to be coaxial with the positioning cone 239, thereby ensuring the detection effect. In the process of multi-point outward expansion synchronous adjustment of the coaxiality, in order to avoid the overall offset of the bridge housing assembly caused by single-point outward expansion, two arc-shaped external support blocks 244 close to each other are used in a single position (that is, in the same through hole) to offset the opposite side offset trend, thereby fully ensuring the concentric positioning effect.

[0048] Specifically, the one-way component 236 used in this application is a common electromagnetic controller. When the single-axis motor 234 rotates forward, the rotation of the screw threaded rod 235 can selectively drive the corresponding gear group 241 and the connecting rod 238 to move through the electromagnetic controller. When a single bridge housing assembly is completed, the single-axis motor 234 reverses to drive the corresponding gear group 241 and the connecting rod 238 to return to their initial positions.

[0049] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A universal inspection fixture for automobile axle housing assemblies, comprising an inspection platform and concentric positioning members fixed to the left and right sides of the inspection platform end surface for positioning the axle housing assembly; a fixed stop member is provided in the middle of the inspection platform end surface for supporting and conveying the axle housing assembly, characterized in that: The fixed limiter includes a positioning platform for dynamically supporting the axle housing assembly placed at the upper end and a positioning assembly arranged at the lower end of the positioning platform. The positioning platform coaxially positions and fixes the inner wall of the middle part of the axle housing assembly by means of multi-point synchronous outward expansion and resistance. The positioning assembly is used to drive the positioning platform to move back and forth in front of the upper end of the inspection platform. The detection platform between the fixed limiter and the concentric positioning member is provided with a laser detection component that slides in the left and right directions and is used to detect the outer diameter of the axle housing assembly; The concentric positioning member includes a table rail seat fixed to the inspection platform by bolts; a vertical base is provided on the upper end of the table rail seat via an electric slider; the vertical bases on the two concentric positioning members are provided with a concentric drive assembly that slides up and down on the end surfaces that are close to each other and is used to extend into the shaft hole of the axle housing assembly to achieve multi-point synchronous support and positioning. The positioning platform and the concentric drive assembly cooperate with each other to achieve concentric self-correction of the automobile axle housing; A rectangular track frame is provided at one end of the vertical base close to the fixed limit piece, and a U-shaped card seat is provided on the outside of the rectangular track frame for sliding; The concentric drive assembly includes a cylinder seat fixedly mounted on a U-shaped base by bolts, a telescopic cylinder mounted on the cylinder seat, a fixed sleeve connected to the end of the telescopic cylinder, a single-axis motor connected to the interior of the fixed sleeve, a lead screw threaded rod connected to the output end of the single-axis motor, a one-way assembly connected to the lead screw threaded rod, and two symmetrical side push plates are provided on the outer wall of the fixed sleeve for rotation via a pin shaft, and the side push plates are connected to the one-way assembly via a connecting rod. The fixed sleeve is evenly provided with through holes on the circumferential outer wall of one side near the fixed limit piece. The end of the lead screw threaded rod near the positioning cone is also connected to a gear set. A one-way component is also provided inside the gear set. The outer wall of the gear set is connected to a bidirectional lead screw corresponding to the number of the through holes. Two relatively movable connecting rods are threadedly connected to the bidirectional lead screws. One end of the movable connecting rod passing through the through hole is connected to an arc-shaped external support block. The upper end of the positioning platform is a disc-shaped structure. Two sink grooves are symmetrically provided on the upper end surface of the positioning platform. A bidirectional threaded rod is rotatably provided inside the sink groove. A driven bevel gear is fixedly provided in the middle of the bidirectional threaded rod. An L-shaped push rod is provided on each of the two threaded sections of the bidirectional threaded rod. The other end of the L-shaped push rod is slidably provided inside the sink groove. The positioning platform dynamically supports the axle housing assembly while simultaneously performing multi-point synchronous outward expansion coaxial positioning on the middle part of the axle housing assembly.

2. The universal inspection tool for automobile axle housing assembly according to claim 1, characterized in that: A limit spring is provided between the L-shaped push rod and the end of the bidirectional threaded rod; a dual-axis motor is also fixed inside the positioning platform, and the two driving shafts of the dual-axis motor are connected to the active bevel gear, which is engaged with the driven bevel gear at the corresponding position.

3. The universal inspection tool for automobile axle housing assembly according to claim 2, characterized in that: The center position of the positioning platform is telescopically provided with an extension and lowering platform, the interior of the extension and lowering platform is provided with a dynamic detector, and the dynamic detector is electrically connected to the dual-axis motor.

4. The universal inspection tool for automobile axle housing assembly according to claim 2, characterized in that: The interior of the rectangular track frame is a cavity structure, and a multi-stage electric telescopic rod is arranged inside it. The top of the multi-stage electric telescopic rod is connected to a T-shaped rod. Strip holes are opened on both sides of the rectangular track frame. A limit sleeve is slidingly provided inside the strip hole. A locking column with a spring on the surface is slidingly provided inside the limit sleeve. A wedge surface is provided at one end of the locking column that cooperates with the transverse section of the T-shaped rod; the other end of the locking column passes through the strip hole toward the inner wall of the U-shaped base; the inner wall of the U-shaped base is symmetrically provided with spring telescopic rods, and one end of the spring telescopic rod is in contact with the circumferential outer wall of the locking column.

5. The universal inspection tool for automobile axle housing assembly according to claim 1, characterized in that: One end of the fixing sleeve facing the fixing limit piece is threadedly connected with a positioning cone for guiding and inserting into the shaft hole of the axle housing assembly.

6. The universal inspection tool for automobile axle housing assembly according to claim 1, characterized in that: A limiting block hinged to all movable connecting rods is arranged inside the fixed sleeve.

7. The universal inspection tool for automobile axle housing assembly according to claim 6, characterized in that: Balls are arranged on one end of the L-shaped push rod that contacts the bridge housing assembly, both ends of the transverse section of the T-shaped rod and the outer wall of the arc-shaped outer support block.

8. The universal inspection tool for automobile axle housing assembly according to claim 1, characterized in that: A rubber pad is provided on the outer wall of one end of the side thrust plate facing the axle housing assembly to be inspected.

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