A coaxiality and height composite detection device and detection equipment

Abstract

The application relates to the technical field of product parameter detection, and discloses a coaxiality and height composite detection device and detection equipment. The device comprises a detection mechanism, the detection mechanism comprises a first sensor, a second sensor and a detection assembly; the detection assembly comprises an internal detection rod, a middle detection sleeve and an external detection sleeve which are coaxially arranged and extend along a first direction. The coaxiality detection and the height detection can be completed through one-time clamping of the workpiece, two independent toolings are not needed, the defect of needing multiple calibrations is avoided, the workpiece repeated positioning is reduced, the detection efficiency is improved, the high production rhythm of the automatic production line is adapted, and batch detection is suitable; the coaxiality and height composite detection device relies on two sensors and a coaxial nested detection assembly to perform detection, realizes coaxiality qualification determination and height detection through mechanical contact type displacement collection, does not need to rotate the workpiece to perform all-around contact of the workpiece, simplifies the structure and reduces the damage rate of the workpiece.

Description

Technical Field

[0001] This invention relates to the field of product parameter testing technology, and in particular to a composite testing device and equipment for coaxiality and height. Background Technology

[0002] With the continuous improvement of industrial technology, the accuracy of product height and coaxiality detection is constantly increasing in response to the demands of automation and intelligence. For example, stepped shaft parts need to ensure high coaxiality between each step, that is, high radial accuracy, in order to ensure smooth rotation during subsequent installation. It is also necessary to measure the height of the parts to ensure axial accuracy.

[0003] In existing technologies, workpiece height and coaxiality are typically measured using two separate sets of fixtures: one for coaxiality and the other for height. This often requires changing fixtures and re-clamping the workpiece, which has several drawbacks: First, zero-point calibration is required after changing to a separate fixture, increasing workload and incompatible with the high-speed production pace of automated production lines. Second, existing technologies typically use a rotary dial indicator method to measure workpiece coaxiality. The workpiece is mounted between a center or V-block fixture, then rotated. A dial indicator or inductive displacement probe is placed against the workpiece's sidewall to collect radial runout during rotation. Multi-section sampling is used to fit the axis and calculate the coaxiality error. However, this method is only suitable for small to medium batch sampling and is prone to scratching the workpiece, making it unsuitable for high-precision, high-volume production. Summary of the Invention

[0004] The purpose of this invention is to provide a composite detection device and equipment for coaxiality and height, which can complete coaxiality and height detection by clamping the workpiece once.

[0005] To achieve this objective, the present invention adopts the following technical solution: A composite detection device for coaxiality and height is provided for detecting whether the coaxiality of a workpiece is qualified and for detecting its height. The composite detection device for coaxiality and height includes a detection mechanism, which includes a first sensor, a second sensor, and a detection component. The detection component includes an inner detection rod, an intermediate detection sleeve, and an outer detection sleeve, all extending along a first direction and coaxially arranged. The outer detection sleeve is provided with a through hole extending along the first direction, and the detection end of the first sensor abuts against the top surface of the outer detection sleeve to detect the first displacement of the outer detection sleeve in the first direction. The intermediate detection sleeve is movably inserted through the through hole, and the bottom surface of the outer detection sleeve extends beyond the bottom surface of the intermediate detection sleeve by a predetermined distance. The intermediate detection sleeve is provided with sliding holes and receiving cavities that both extend along the first direction. The sliding holes and the receiving cavities are arranged in the first direction and are interconnected. The receiving cavities are used to accommodate the workpiece. The internal detection rod is movably inserted through the sliding hole and is at least partially located within the receiving cavity. The bottom surface of the internal detection rod can abut against the upper detection surface of the workpiece. The detection end of the second sensor abuts against the top surface of the internal detection rod to detect the second displacement of the internal detection rod in the first direction. When inspecting the workpiece, the workpiece is placed in the receiving cavity and moved upward along the first direction. When the workpiece moves to its limit, if the first displacement matches the preset distance and the bottom surface of the outer detection sleeve, the bottom surface of the middle detection sleeve, and the lower detection surface of the workpiece are flush, then the coaxiality of the workpiece is qualified; the height of the workpiece matches the second displacement.

[0006] Preferably, in the detection assembly, the measurement origin of both the detection end of the first sensor and the detection end of the second sensor is the bottom surface of the outer detection sleeve, and the height of the workpiece is the difference between the displayed value of the second sensor and the displayed value of the first sensor.

[0007] Preferably, the outer detection sleeve has a strip-shaped hole extending along the first direction on its side wall, the strip-shaped hole communicating with the through hole, and a guide block is provided on the outer side wall of the middle detection sleeve. When the outer detection sleeve and the middle detection sleeve slide relative to each other, the guide block moves within the strip-shaped hole.

[0008] Preferably, the outer detection sleeve includes a first body and a first stop, the first stop being connected to the top of the first body, and the detection end of the first sensor abutting against the side of the first stop away from the first body; the middle detection sleeve includes a second body and a second stop, the second stop being connected to the outer wall of the second body and located outside the outer detection sleeve, the second stop and the first stop being spaced apart in the first direction, and a first reset member being provided between the second stop and the first stop.

[0009] Preferably, the outer detection sleeve further includes a first protruding tooth, which extends along the first direction and is connected to the bottom of the first sleeve body. The middle detection sleeve further includes a second protruding tooth, which extends along the first direction and is connected to the bottom of the second sleeve body. The bottom surface of the first protruding tooth extends beyond the bottom surface of the second protruding tooth by the preset distance, and the bottom surface of the first protruding tooth extends beyond the second protruding tooth and is offset in the circumferential direction of the detection component.

[0010] Preferably, the inner wall of the intermediate detection sleeve is provided with a protrusion to divide the interior of the intermediate detection sleeve into the sliding hole and the receiving cavity. The outer peripheral side wall of the inner detection rod is provided with a protruding ring. The inner detection rod passes through the sliding hole and is at least partially located in the receiving cavity, and the protruding ring can abut against the top of the protrusion.

[0011] Preferably, the detection assembly further includes a sealing cap and a second reset member. The sealing cap is disposed on the top of the intermediate detection sleeve and the internal detection rod passes through the sealing cap. The second reset member is located inside the intermediate detection sleeve and sleeved outside the internal detection rod. One end of the second reset member is connected to the sealing cap, and the other end is connected to the convex ring.

[0012] Preferably, the coaxiality and height composite detection device further includes a power mechanism, which includes a drive component, a floating upper base, and a floating lower base. The floating lower base is capable of moving up and down relative to the floating upper base. The fixed end of the drive component is connected to the floating upper base, and the output end of the drive component is connected to the floating lower base. The floating lower base is fixedly connected to the intermediate detection sleeve. The drive component is used to drive the floating lower base to move, thereby driving the detection mechanism to move closer to the workpiece.

[0013] Preferably, the composite detection device for coaxiality and height further includes a quick-change base, the floating lower base is connected to the quick-change base, and the quick-change base is detachably connected to the intermediate detection sleeve.

[0014] A testing device includes a transport platform, a lifting device, a clamping device, and the aforementioned composite testing device for coaxiality and height. The transport platform includes a transport track extending along the transport direction and a movable stage. The movable stage is movably disposed on the transport track and is used to carry workpieces. The lifting device is disposed below the movable stage. The clamping device and the composite testing device for coaxiality and height are disposed opposite to each other on both sides of the transport track.

[0015] The beneficial effects of this invention are: This invention proposes a composite detection device for coaxiality and height. Coaxiality and height can be detected in a single clamping of the workpiece, eliminating the need for two separate sets of tooling for two independent tests. This avoids the need for multiple calibrations, reduces repetitive workpiece positioning, improves detection efficiency, and is suitable for the high-speed production rhythm of automated production lines, making it ideal for batch testing. Furthermore, this composite detection device relies on two sensors and a coaxial nested detection assembly for detection. Through mechanical contact displacement acquisition, it achieves coaxiality qualification and height detection without rotating the workpiece for omnidirectional contact, simplifying the structure and reducing workpiece damage.

[0016] On the other hand, the present invention also proposes a testing device, including a transport platform, a lifting device, a clamping device, and a composite testing device for coaxiality and height as described above. The transport platform includes a transport track extending along the transport direction and a moving platform. The moving platform is movably mounted on the transport track and is used to carry the workpiece. The lifting device is located below the moving platform. The clamping device and the composite testing device for coaxiality and height are arranged opposite each other on both sides of the transport track. Using the aforementioned composite testing device for coaxiality and height can reduce errors from multiple clamping and positioning operations, improve testing accuracy and efficiency, and achieve automatic transfer and transport of the workpiece through the transport platform, delivering the workpiece to the testing station. The clamping device can clamp and position the workpiece at the testing station. The lifting device drives the moving platform to feed the workpiece along a first direction, providing the testing feed action for the composite testing device for coaxiality and height. This integrates workpiece transport, feeding, clamping, and composite testing of coaxiality and height into one unit, eliminating the need for manual loading and unloading. It can be connected to an assembly line for batch automated testing, and each functional module is independent, facilitating assembly, debugging, and maintenance. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the composite detection device for coaxiality and height proposed in an embodiment of the present invention from one perspective; Figure 2 This is a schematic diagram of the coaxiality and height composite detection device proposed in an embodiment of the present invention from another perspective; Figure 3 This is a schematic diagram of the detection component proposed in an embodiment of the present invention; Figure 4 This is a cross-sectional view of the detection component proposed in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the external detection sleeve proposed in an embodiment of the present invention; Figure 6 This is a cross-sectional view of the external detection sleeve proposed in an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the intermediate detection sleeve proposed in an embodiment of the present invention; Figure 8 This is a cross-sectional view of the intermediate detection sleeve proposed in an embodiment of the present invention; Figure 9 This is a schematic diagram of the detection device proposed in the embodiments of the present invention; Figure 10 This is a schematic diagram of the lifting device proposed in the embodiments of the present invention; Figure 11 This is a schematic diagram of the clamping device proposed in the embodiments of the present invention; Figure 12 This is a schematic diagram of the conical stepped shaft proposed in an embodiment of the present invention.

[0018] In the picture: 1. Detection mechanism; 11. First sensor; 12. Second sensor; 13. Detection assembly; 131. Outer detection sleeve; 1311. First body; 1312. First stop; 1313. First toothed part; 1314. Through hole; 1315. Strip hole; 132. Intermediate detection sleeve; 1321. Second body; 1322. Second stop; 1323. Second toothed part; 1324. Sliding hole; 1325. Receiving cavity; 1326. Protrusion; 133. Internal detection rod; 1331. Protruding ring; 134. Guide block; 135. First reset component; 136. Second reset component; 137. Sealing cap; 2. Power mechanism; 21. Drive components; 211. First-stage lifting cylinder; 212. Second-stage lifting cylinder; 22. Floating upper base; 23. Floating lower base; 3. Quick-change base; 4. Quick-change knob; 10. Conveyor rail; 20. Moving platform; 30. First drive component; 40. Lifting plate; 50. Positioning pin; 60. Second drive component; 70. Mounting plate; 80. Third drive component; 90. Gripper; 100. Workpiece; 1001. First shaft section; 1002. Second shaft section; 1003. Tapered section. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0020] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0023] For stepped shaft parts, it is necessary to check the coaxiality accuracy between each step and the height of the part to determine whether the part meets production standards. Parts that meet the production standards can continue to be transported to the next production process on the transport platform; parts that do not meet the production standards must be rejected promptly. (Refer to...) Figure 12For example, in this embodiment, the workpiece 100 is a tapered stepped shaft. The workpiece 100 includes a first shaft portion 1001, a second shaft portion 1002, and a tapered portion 1003. The first shaft portion 1001, the second shaft portion 1002, and the tapered portion 1003 are sequentially connected and coaxially arranged in a first direction. The diameter of the first shaft portion 1001 is smaller than the diameter of the second shaft portion 1002, and the diameter of the second shaft portion 1002 is slightly smaller than the bottom diameter of the tapered portion 1003. The first shaft portion 1001 is connected to the end of the second shaft portion 1002 that is away from the tapered portion 1003. When measuring the coaxiality and height of this tapered stepped shaft, specifically, the coaxiality refers to the coaxiality of the first shaft portion 1001 and the second shaft portion 1002 with the reference axis of the workpiece 100, and the height refers to the total height of the first shaft portion 1001 and the second shaft portion 1002 in the first direction.

[0024] Reference Figures 1 to 8 This embodiment proposes a composite detection device for coaxiality and height, used to detect whether the coaxiality of a workpiece 100 is qualified and to detect its height. This composite detection device for coaxiality and height includes a detection mechanism 1, which includes a first sensor 11, a second sensor 12, and a detection component 13. The detection component 13 includes an inner detection rod 133, an intermediate detection sleeve 132, and an outer detection sleeve 131, all extending along a first direction and coaxially arranged. The inner detection rod 133 is located at the innermost part, and the intermediate detection sleeve 132 is coaxially sleeved outside the inner detection rod 133. The outer detection sleeve 131 is coaxially sleeved outside the intermediate detection sleeve 132.

[0025] Specifically, the outer detection sleeve 131 has a through hole 1314 extending in the first direction. The detection end of the first sensor 11 abuts against the top surface of the outer detection sleeve 131 to detect the first displacement of the outer detection sleeve 131 in the first direction. The intermediate detection sleeve 132 is movably inserted through the through hole 1314, and the bottom surface of the outer detection sleeve 131 extends beyond the bottom surface of the intermediate detection sleeve 132 by a predetermined distance. The intermediate detection sleeve 132 has sliding holes 1324 extending in the first direction and a receiving cavity 1. 325, the sliding hole 1324 and the receiving cavity 1325 are arranged and interconnected in the first direction. The receiving cavity 1325 is used to accommodate the workpiece 100. The internal detection rod 133 is movably inserted through the sliding hole 1324 and is at least partially located in the receiving cavity 1325. The bottom surface of the internal detection rod 133 can abut against the upper detection surface of the workpiece 100. The detection end of the second sensor 12 abuts against the top surface of the internal detection rod 133 to detect the second displacement of the internal detection rod 133 in the first direction. When detecting the workpiece 100, the workpiece 100 is placed in the receiving cavity 1325 and moved upward in the first direction. When the workpiece 100 moves to its limit, if the first displacement matches the preset distance and the bottom surface of the outer detection sleeve 131, the bottom surface of the middle detection sleeve 132, and the lower detection surface of the workpiece 100 are flush, then the coaxiality of the workpiece 100 is qualified; the height of the workpiece 100 matches the second displacement.

[0026] For a tapered stepped shaft, coaxiality refers to the coaxiality between the first shaft portion 1001 and the second shaft portion 1002 and the reference axis. Height refers to the total height of the first shaft portion 1001 and the second shaft portion 1002 in the first direction. Therefore, the upper detection surface of the workpiece 100 is the top surface of the first shaft portion 1001, and the lower detection surface of the workpiece 100 is the bottom surface of the second shaft portion 1002, which is the side where the tapered portion 1003 connects to the second shaft portion 1002.

[0027] In the detection assembly 13, a through hole 1314 is provided inside the outer detection sleeve 131. The through hole 1314 is a hole of equal diameter, allowing the intermediate detection sleeve 132 to move through. The diameter of the through hole 1314 is slightly larger than the outer diameter of the intermediate detection sleeve 132, which facilitates relative sliding between the intermediate detection sleeve 132 and the outer detection sleeve 131 in the first direction. The bottom surface of the outer detection sleeve 131 extends beyond the bottom surface of the intermediate detection sleeve 132 by a preset distance, while the top surface of the outer detection sleeve 131 abuts against the detection end of the first sensor 11. Therefore, when measuring the workpiece 100, the workpiece 100 will push the bottom surface of the outer detection sleeve 131 upward, causing the outer detection sleeve 131 to displace. The first sensor 11 reads the displacement of the outer detection sleeve 131. The intermediate detection sleeve 132 is provided with a sliding hole 1324 and a receiving cavity 1325. The sliding hole 1324 is a hole of equal diameter, allowing the internal detection rod 133 to move through it, with part of the internal detection rod 133 placed in the receiving cavity 1325. The receiving cavity 1325 is used to accommodate the workpiece 100 and plays a role in radial positioning of the workpiece 100. The top surface of the internal detection rod 133 is connected to the detection end of the second sensor 12, while the bottom surface of the internal detection rod 133 can abut against the workpiece 100. Therefore, when measuring the workpiece 100, the workpiece 100 will push the internal detection rod 133 upward, and the second sensor 12 reads the displacement of the internal detection rod 133.

[0028] It is understood that the receiving cavity 1325 is used to place the workpiece 100, and the shape of the receiving cavity 1325 is determined according to the actual shape of the workpiece 100, and the specific dimensions of the receiving cavity 1325 are determined according to the specific dimensions of the standard part. In this embodiment, the receiving cavity 1325 includes a first cavity and a second cavity, which are arranged in a first direction and are interconnected. The second cavity is located on the side of the first cavity opposite to the sliding hole 1324. Both the first cavity and the second cavity are cylindrical cavities of equal diameter. The cavity diameter of the first cavity is adapted to the diameter of the first shaft portion 1001 of the standard part, and the cavity diameter and height of the second cavity are adapted to the diameter and height of the second shaft portion 1002 of the standard part.

[0029] In the detection assembly 13 of the composite detection device for coaxiality and height, in the initial state, the bottom surface of the outer detection sleeve 131 extends beyond the bottom surface of the middle detection sleeve 132 by a predetermined distance, and the inner detection rod 133 is at least partially located within the receiving cavity 1325. When measuring the workpiece 100, the workpiece 100 enters the detection assembly 13 from the bottom upward along the first direction, that is, it enters the receiving cavity 1325 of the middle detection sleeve 132. When the workpiece 100 reaches its limit position, that is, when it can no longer continue to move upward along the first direction, if the workpiece 100 is completely inside the receiving cavity 1325, that is, the first shaft portion 1001 is completely inserted into the first cavity and the second shaft portion 1002 is completely inserted into the second cavity, then the coaxiality of the surface workpiece 100 matches the coaxiality of the standard part, and the coaxiality of the workpiece 100 is qualified. It needs to be explained that the standard for determining whether workpiece 100 is fully engaged in the receiving cavity 1325 is whether the first displacement is equal to the preset distance. When the coaxiality of workpiece 100 is qualified, workpiece 100 will not cause radial interference to the intermediate detection sleeve 132 and will continue to move upward in the receiving cavity 1325. During the movement, the lower detection surface of workpiece 100 will push the bottom surface of the outer detection sleeve 131 upward synchronously, causing the outer detection sleeve 131 to move upward. When workpiece 100 reaches the limit position, the outer detection sleeve 131 moves upward by the first displacement. Since the outer detection sleeve 131 extends out of the intermediate detection sleeve 132 by a preset distance, if the lower detection surface of workpiece 100 pushes the bottom surface of the outer detection sleeve 131 upward synchronously by the first displacement and the first displacement is equal to the preset distance, it indicates that the bottom surface of the outer detection sleeve 131, the bottom surface of the intermediate detection sleeve 132, and the lower detection surface of workpiece 100 are flush, that is, workpiece 100 is successfully engaged in the receiving cavity 1325, and the coaxiality of workpiece 100 is qualified. If the coaxiality of workpiece 100 is unqualified, meaning workpiece 100 itself is eccentric, workpiece 100 cannot fully enter the receiving cavity 1325. This means workpiece 100 will cause radial interference with the intermediate detection sleeve 132, preventing it from continuously moving upwards within the receiving cavity 1325. Consequently, it cannot push the bottom surface of the outer detection sleeve 131 upwards, or can only push it slightly upwards a short distance. In this case, the first displacement is not equal to the preset distance, indicating that the bottom surfaces of the outer detection sleeve 131, the intermediate detection sleeve 132, and the lower detection surface of workpiece 100 are not flush. Workpiece 100 is not fully inserted into the receiving cavity 1325, and the coaxiality of workpiece 100 is unqualified. It can be understood that workpiece 100 fully entering the receiving cavity 1325 means that the parts of workpiece 100 to be tested (i.e., the first shaft portion 1001 and the second shaft portion 1002) are fully inserted into the receiving cavity 1325. Optionally, the preset distance is 1mm.

[0030] Furthermore, when the coaxiality of the workpiece 100 is qualified, during the upward movement of the workpiece 100 within the detection assembly 13, the upper detection surface of the workpiece 100 contacts the bottom surface of the internal detection rod 133, pushing the internal detection rod 133 to slide upward synchronously. The top surface of the internal detection rod 133 pushes the second sensor 12, generating a second displacement. That is, the workpiece 100 enters the receiving cavity 1325 and pushes the internal detection rod 133 to move by a second displacement, thereby matching the height of the workpiece 100.

[0031] The coaxiality and height composite detection device proposed in this embodiment can complete coaxiality and height detection with a single clamping of the workpiece 100, eliminating the need for two separate sets of tooling for two independent tests. This avoids the defects of requiring multiple calibrations, reduces the need for repeated positioning of the workpiece 100, improves detection efficiency, adapts to the high-speed production rhythm of automated production lines, and is suitable for batch testing. In addition, this coaxiality and height composite detection device relies on two sensors and a coaxial nested detection component 13 for detection. Through mechanical contact displacement acquisition, it realizes coaxiality qualification judgment and height detection without rotating the workpiece 100 to achieve all-round contact with the workpiece 100, simplifying the structure and reducing the damage rate to the workpiece 100.

[0032] It is worth mentioning that the height measurement of workpiece 100 is carried out on the premise that the coaxiality of workpiece 100 is qualified. The height measurement is carried out only after the coaxiality of workpiece 100 is qualified; if the coaxiality of workpiece 100 is not qualified, it is directly rejected and there is no need to carry out the next height measurement.

[0033] In addition, during the coaxiality judgment process of workpiece 100, there is a situation where the coaxiality of workpiece 100 is actually qualified, but the second shaft part 1002 is too long. This situation will also cause the lower detection surface of workpiece 100 to be unable to push the bottom surface of the outer detection sleeve 131 to be flush with the bottom surface of the middle detection sleeve 132, and workpiece 100 is not completely inserted into the receiving cavity 1325. At this time, the second shaft part 1002 is too long, and it is also directly judged as unqualified in terms of coaxiality, and it is directly rejected without subsequent height detection.

[0034] When measuring the height of workpiece 100, the height of workpiece 100 is reflected by the second displacement. Specifically, the first sensor 11 and the second sensor 12 can be benchmarked first. The measurement origin of both the first sensor 11 and the second sensor 12 is the bottom surface of the outer detection sleeve 131 to ensure measurement accuracy and synchronization. That is, when not measuring, the display value of the first sensor 11 is zero, and the display value of the second sensor 12 is the distance between the bottom of the inner detection rod 133 and the bottom surface of the outer detection sleeve 131; when the workpiece 100 moves to its limit (completely enters the receiving cavity 1325), the display value of the first sensor 11 is the first displacement, and the display value of the second sensor 12 is the sum of the distance between the bottom of the inner detection rod 133 and the bottom surface of the outer detection sleeve 131 and the second displacement. The height of workpiece 100 is the axial distance between the upper detection surface of workpiece 100 and the lower detection surface of workpiece 100. The position of the upper detection surface of workpiece 100 corresponds to the display value of the second sensor 12, and the position of the lower detection surface of workpiece 100 corresponds to the display value of the first sensor 11. Therefore, the height of workpiece 100 is the difference between the display value of the second sensor 12 and the display value of the first sensor 11.

[0035] Specifically, in some embodiments, the initial value of the second sensor 12 can be zeroed first. That is, in the initial state, the bottom surface of the inner detection rod 133 of the detection component 13 is flush with the bottom surface of the outer detection sleeve 131. Therefore, when not detecting, the display values ​​of the first sensor 11 and the second sensor 12 are both zero. During the detection process, the upper detection surface of the workpiece 100 contacts the bottom surface of the inner detection rod 133, pushing the inner detection rod 133 to slide upward synchronously by a second displacement. The lower detection surface of the workpiece 100 pushes the outer detection sleeve 131 to move upward by a first displacement, and finally the bottom surface of the outer detection sleeve 131, the bottom surface of the intermediate detection sleeve 132, and the lower detection surface of the workpiece 100 are flush. At this time, the display value of the first sensor 11 is the first displacement, the display value of the second sensor 12 is the second displacement, and the height of the workpiece 100 is the difference between the first displacement and the second displacement. In other embodiments, to reduce the second displacement of the internal detection rod 133 and thus ensure the accuracy of height measurement, the internal detection rod 133 can be adjusted to a certain height. That is, in the initial state, the bottom surface of the internal detection rod 133 and the bottom surface of the outer detection sleeve 131 have an initial distance. Therefore, when not in use, the displayed values ​​of the first sensor 11 are all zero, and the displayed value of the second sensor 12 is the initial distance. During the detection process, the upper detection surface of the workpiece 100 contacts the bottom surface of the internal detection rod 133, pushing the internal detection rod 133 to slide upwards by a second displacement. The lower detection surface of the workpiece 100 pushes the outer detection sleeve 131 upwards by a first displacement, and finally, the bottom surfaces of the outer detection sleeve 131, the middle detection sleeve 132, and the lower detection surface of the workpiece 100 are flush. At this time, the displayed value of the first sensor 11 is the first displacement, and the displayed value of the second sensor 12 is the sum of the initial distance and the second displacement. Therefore, the height of the workpiece 100 is the difference between the sum of the initial distance and the second displacement and the first displacement. It is worth mentioning that the initial distance should be less than the height of the standard workpiece 100, so as to ensure that the upper detection surface of the workpiece 100 can abut against the bottom surface of the internal detection rod 133.

[0036] In addition, in this embodiment, the composite detection device for coaxiality and height also includes a power mechanism 2. The power mechanism 2 includes a drive component 21, a floating upper base 22, and a floating lower base 23. The floating lower base 23 can move up and down relative to the floating upper base 22. The fixed end of the drive component 21 is connected to the floating upper base 22, and the output end of the drive component 21 is connected to the floating lower base 23. The floating lower base 23 is fixedly connected to the intermediate detection sleeve 132. The drive component 21 is used to drive the floating lower base 23 to move, thereby driving the detection mechanism 1 to move closer to the workpiece 100. The floating lower base 23 is fixedly connected to the intermediate detection sleeve 132. When the floating lower base 23 moves downward in the first direction under the action of the drive component 21, it drives the intermediate detection sleeve 132 to move downward, thereby driving the entire detection mechanism 1 to move downward. Before inspection, workpiece 100 is clamped and fixed by an external clamping device, with the bottom of workpiece 100 facing the bottom of inspection assembly 13. Driven component 21 drives the floating lower base 23 to move downwards in a first direction, thereby moving the inspection mechanism 1 downwards in the first direction until the receiving cavity 1325 of the internal inspection rod 133 encloses workpiece 100 for inspection. Optionally, the floating lower base 23 and the floating upper base 22 move relative to each other via a planar bearing.

[0037] Furthermore, the driving component 21 includes a primary lifting cylinder 211 and a secondary lifting cylinder 212. The output end of the primary lifting cylinder 211 is connected to the fixed end of the secondary lifting cylinder 212, and the output end of the secondary lifting cylinder 212 is connected to the floating lower base 23. The floating lower base 23 is fixedly connected to the intermediate detection sleeve 132. Before inspecting the workpiece 100, the workpiece 100 is clamped and fixed by an external clamping device, with both the first shaft portion 1001 and the second shaft portion 1002 facing upwards. The primary lifting cylinder 211 is activated, driving the secondary lifting cylinder 212 and the detection mechanism 1 to descend synchronously, so that part of the workpiece 100 is placed in the receiving cavity 1325 of the intermediate detection sleeve 132. At this time, the workpiece 100 has a certain supporting force and will not tip over. The clamping device can be released. The secondary lifting cylinder 212 is activated, driving the supporting base and the intermediate detection sleeve 132 to descend, so that the workpiece 100 moves in the receiving cavity 1325 along the first direction until the workpiece 100 completely enters the receiving cavity to complete the inspection.

[0038] Furthermore, the coaxiality and height composite testing device also includes a quick-change base 3, with a floating lower base 23 connected to the quick-change base 3, and the quick-change base 3 detachably connected to the intermediate testing sleeve 132. When the floating lower base 23 moves downward, it drives the quick-change base 3 downward, thereby driving the intermediate testing sleeve 132 to move. The shape and size of the receiving cavity 1325 in different intermediate testing sleeves 132 are different, thus corresponding to accommodating different types of workpieces 100. The quick-change base 3 is detachably connected to the intermediate testing sleeve 132, allowing different intermediate testing sleeves 132 to be replaced to test different workpieces 100, increasing the application range of the coaxiality and height composite testing device. In addition, the quick-change base 3 is provided with a quick-change knob 4, which can be rotated to remove the intermediate testing sleeve 132. The cooperation method between the quick-change knob 4 and the quick-change base 3 is prior art and will not be described in detail here.

[0039] Optionally, the fixed end of the first sensor 11 is connected to the quick-change base 3, and the fixed end of the second sensor 12 is fixed to the floating lower base 23.

[0040] In this embodiment, a strip-shaped hole 1315 extending along a first direction is provided on the side wall of the outer detection sleeve 131. The strip-shaped hole 1315 communicates with the through hole 1314. A guide block 134 is provided on the outer side wall of the intermediate detection sleeve 132. When the outer detection sleeve 131 and the intermediate detection sleeve 132 slide relative to each other, the guide block 134 moves within the strip-shaped hole 1315. The strip-shaped hole 1315 extends along the first direction, and the guide block 134 is constrained within the strip-shaped hole 1315. When the outer detection sleeve 131 slides relative to the intermediate detection sleeve 132 under the pushing action of the workpiece 100, the guide block 134 can only slide relative to the intermediate detection sleeve 132 along the length direction of the strip-shaped hole 1315, which is the first direction. This restricts radial offset or circumferential rotation between the outer detection sleeve 131 and the intermediate detection sleeve 132, thereby improving stability. Secondly, the strip-shaped hole 1315 has upper and lower end faces, which can form a mechanical stop for the guide block 134. When the guide block 134 abuts against the lower end wall of the strip-shaped hole 1315, the outer detection sleeve 131 is at its downward limit position. At this time, the composite detection device for coaxiality and height is in an unloaded initial state, ensuring that the distance between the bottom surface of the outer detection sleeve 131 and the bottom surface of the middle detection sleeve 132 is maintained at a preset distance when unloaded. When the guide block 134 abuts against the upper end wall of the strip-shaped hole 1315, the outer detection sleeve 131 is at its maximum upward sliding stroke relative to the middle detection sleeve 132, preventing the outer detection sleeve 131 from excessively moving upward and falling out, thus avoiding complete separation of the two sleeves. It is understood that the length of the strip-shaped hole 1315 will not affect the flushness of the bottom surface of the outer detection sleeve 131 and the bottom surface of the middle detection sleeve 132.

[0041] Optionally, two strip holes 1315 are provided, located on opposite sides of the outer detection sleeve 131 in the circumferential direction. Two guide blocks 134 are also provided, with each guide block 134 corresponding to one of the two strip holes 1315 to ensure uniform force distribution.

[0042] Additionally, refer to Figures 3 to 8 The outer detection sleeve 131 includes a first body 1311 and a first stop platform 1312. The first stop platform 1312 is connected to the top of the first body 1311. The detection end of the first sensor 11 abuts against the side of the first stop platform 1312 away from the first body 1311. The middle detection sleeve 132 includes a second body 1321 and a second stop platform 1322. The second stop platform 1322 is connected to the outer wall of the second body 1321 and is located outside the outer detection sleeve 131. The second stop platform 1322 and the first stop platform 1312 are spaced apart in a first direction, and a first reset member 135 is provided between the second stop platform 1322 and the first stop platform 1312. The first body 1311 extends along the first direction, and the through hole 1314 is located inside the first body 1311. The first stop platform 1312 is connected to the top of the first body 1311 and extends outward along the circumference of the first body 1311 to form an edge platform. The detection end of the first sensor 11 can abut against the upper surface of the first stop platform 1312. The second body 1321 also extends along the first direction. The sliding hole 1324 and the receiving cavity 1325 are located inside the second body 1321. The second stop platform 1322 is connected to the middle of the second body 1321 and extends outward along the circumference of the second body 1321 to form an edge platform. The second stop platform 1322 and the first stop platform 1312 are spaced apart and a first reset member 135 is provided between them. The reset thrust of the first reset member 135 pushes the first stop platform 1312 away from the second stop platform 1322. During the testing process, the lower testing surface of the workpiece 100 pushes the outer testing sleeve 131 to move upward, which in turn drives the first stop platform 1312 to move upward. At this time, the first stop platform 1312 moves towards the second stop platform 1322, and the first reset member 135 is compressed. After the test is completed, the workpiece 100 is taken out, and the reset thrust of the first reset member 135 pushes the first stop platform 1312 to reset.

[0043] Optionally, four first reset members 135 are provided, and the four first reset members 135 are evenly spaced along the circumference of the first set of bodies 1311 and the second set of bodies 1321 to provide a uniform reset thrust for the first stop platform 1312. The first reset member 135 is a spring.

[0044] Furthermore, the outer detection sleeve 131 also includes a first protruding tooth 1313, which extends along a first direction and is connected to the bottom of the first sleeve body 1311. The middle detection sleeve 132 also includes a second protruding tooth 1323, which extends along the first direction and is connected to the bottom of the second sleeve body 1321. The bottom surface of the first protruding tooth 1313 extends beyond the bottom surface of the second protruding tooth 1323 by a predetermined distance, and the bottom surface of the first protruding tooth 1313 extends beyond the second protruding tooth 1323 and is offset in the circumferential direction of the detection component 13. The bottom surface of the outer detection sleeve 131 is the body surface of the first protruding tooth portion 1313, and the bottom surface of the middle detection sleeve 132 is the bottom surface of the second protruding tooth portion 1323. The first protruding tooth portion 1313 and the second protruding tooth portion 1323 are staggered in the circumferential direction of the detection component 13, that is, the first protruding tooth portion 1313 and the second protruding tooth portion 1323 do not overlap in the circumferential direction of the outer detection sleeve 131 and the middle detection sleeve 132. Therefore, it can be observed from the outside of the outer detection sleeve 131 whether the bottom surfaces of the outer detection sleeve 131 and the middle detection sleeve 132 are flush. In addition, reducing the contact area between the outer detection sleeve 131 and the middle detection sleeve 132 reduces friction, making the floating of the outer detection sleeve 131 relative to the middle detection sleeve 132 more flexible and smooth.

[0045] In this embodiment, a protrusion 1326 is provided on the inner wall of the intermediate detection sleeve 132 to divide the interior of the intermediate detection sleeve 132 into a sliding hole 1324 and a receiving cavity 1325. A protruding ring 1331 is provided on the outer peripheral side wall of the internal detection rod 133. The internal detection rod 133 passes through the sliding hole 1324 and is at least partially located in the receiving cavity 1325, and the protruding ring 1331 can abut against the top of the protrusion 1326. Through the abutting cooperation between the protruding ring 1331 and the protrusion 1326, the limit position of the downward movement of the internal detection rod 133 within the intermediate detection sleeve 132 is limited, preventing the internal detection rod 133 from moving excessively downward or even falling off. Furthermore, it ensures that the internal detection rod 133 can be reset to the same initial position each time under no-load conditions, ensuring the stability of the initial value of the second sensor 12, avoiding zero-point drift, and providing a stable reference for the difference calculation of the workpiece 100 height.

[0046] Furthermore, the testing mechanism 1 also includes a sealing cover 137 and a second reset member 136. The sealing cover 137 is disposed on the top of the intermediate testing sleeve 132 and the internal testing rod 133 passes through the sealing cover 137. The second reset member 136 is located inside the intermediate testing sleeve 132 and sleeved outside the internal testing rod 133. One end of the second reset member 136 is connected to the sealing cover 137 and the other end is connected to the protruding ring 1331. The second reset member 136 can apply a force close to the protrusion 1326 to the convex ring 1331. During the test, the upper detection surface of the workpiece 100 pushes the internal detection rod 133 upward. At this time, the convex ring 1331 approaches the sealing cover 137, and the first reset member 135 is compressed. After the test is completed, the workpiece 100 is removed, and the reset thrust of the first reset member 135 pushes the convex ring 1331 close to the protrusion 1326, so that the convex ring 1331 fits against the top of the protrusion 1326, realizing the reliable zeroing of the internal detection rod 133 and avoiding the problem of jamming that easily occurs when relying solely on self-realignment. Optionally, the second reset member 136 is a spring.

[0047] On the other hand, refer to Figures 9 to 11 This embodiment also proposes a testing device, which includes a transport platform, a lifting device, a clamping device, and a composite testing device for coaxiality and height as described above. The transport platform includes a transport track 10 extending along the transport direction and a moving platform 20. The moving platform 20 is movably disposed on the transport track 10 and is used to carry the workpiece 100. The lifting device is disposed below the moving platform 20. The clamping device and the composite testing device for coaxiality and height are disposed opposite to each other on both sides of the transport track 10. This testing equipment, employing the aforementioned coaxiality and height composite testing device, reduces multiple clamping and positioning errors, improves testing accuracy and efficiency, and enables automatic transfer and conveying of workpiece 100 via a transport platform, transporting workpiece 100 to the testing station. The clamping device clamps and positions workpiece 100 at the testing station, and the lifting device drives the moving table 20 to feed workpiece 100 along the first direction, providing the testing feed action for the coaxiality and height composite testing device. It integrates the conveying, feeding, clamping, and coaxiality and height composite testing of workpiece 100 into one unit, eliminating the need for manual loading and unloading, and can be connected to an assembly line for batch automated testing. Furthermore, each functional module is independent, facilitating assembly, debugging, and maintenance.

[0048] Furthermore, the lifting device is located below the moving platform 20 and positioned at the inspection station. The lifting device includes a first drive component 30, a lifting plate 40, and a positioning pin 50. When the moving platform 20 reaches the inspection station, the first drive component 30 drives the lifting plate 40 to move upward. The lifting plate 40 and the moving platform 20 are positioned by the positioning pin 50. The first drive component 30 continues to drive the lifting plate 40 upward, thereby driving the moving platform 20 upward. When the moving platform 20 moves upward to the target height, the first drive component 30 stops driving. Furthermore, a limit block is provided on the conveyor track 10. When the moving platform 20 moves upward to the target height, the moving platform 20 abuts against the limit block to prevent the moving platform 20 from moving too much or too little. Optionally, the first drive component 30 is a lifting cylinder.

[0049] The clamping device is located on the other side of the coaxiality and height composite detection device on the conveyor track 10. The clamping device includes a second drive member 60 and a mounting plate 70. A third drive member 80 and grippers 90 are mounted on the mounting plate 70. The output end of the second drive member 60 is connected to the mounting plate 70, and the fixed end of the third drive member 80 is connected to the mounting plate 70. The output end of the third drive member 80 is connected to the two grippers 90. When the moving stage 20 reaches the detection station, the second drive member 60 drives the mounting plate 70 to rise and fall, and then the third drive member 80 drives the two grippers 90 to move closer together to clamp and position the workpiece 100. Optionally, the second drive member 60 is a lifting cylinder, and the third drive member 80 is a gripper 90 cylinder.

[0050] The working process of this testing equipment is as follows: When the moving stage 20 reaches the inspection station, the first drive unit 30 drives the lifting plate 40 to raise the moving stage 20 to the target height, the second drive unit 60 drives the mounting plate 70 to descend, and the third drive unit 80 drives the two grippers 90 to move closer together to clamp the workpiece 100. The first-stage lifting cylinder 211 drives the inspection mechanism 1 to descend, causing the intermediate inspection sleeve 132 to partially fit onto the workpiece 100. Then, the third drive unit 80 drives the two grippers 90 to move away from each other to release the workpiece 100. The second-stage lifting cylinder 212 drives the inspection mechanism 1 to continue descending, causing the intermediate inspection sleeve 132 to continue fitting onto the workpiece 100. The coaxiality of the workpiece 100 is judged to be qualified and the height is measured. After the inspection is completed, the first-stage lifting cylinder 211 and the second-stage lifting cylinder 212 drive the inspection mechanism 1 to rise and disengage from the workpiece 100, and the first drive unit 30 drives the lifting plate 40 to descend, causing the moving stage 20 to return to the conveyor track 10.

[0051] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A composite detection device for coaxiality and height, used to detect whether the coaxiality of a workpiece (100) is qualified and to detect its height, characterized in that, The coaxiality and height composite detection device includes a detection mechanism (1), which includes a first sensor (11), a second sensor (12), and a detection component (13); the detection component (13) includes an inner detection rod (133), an intermediate detection sleeve (132), and an outer detection sleeve (131), all extending along a first direction and coaxially arranged. The outer detection sleeve (131) is provided with a through hole (1314) extending along the first direction. The detection end of the first sensor (11) abuts against the top surface of the outer detection sleeve (131) to detect the first displacement of the outer detection sleeve (131) in the first direction. The intermediate detection sleeve (132) is movably inserted through the through hole (1314), and the bottom surface of the outer detection sleeve (131) extends out of the bottom surface of the intermediate detection sleeve (132) by a predetermined distance. The intermediate detection sleeve (132) is provided with a sliding hole (1324) and a receiving cavity (1325) that both extend along the first direction. The sliding hole (1324) and the receiving cavity (1325) are arranged in the first direction and are interconnected. The receiving cavity (1325) is used to accommodate the workpiece (100). The internal detection rod (133) is movably inserted through the sliding hole (1324) and is at least partially located in the receiving cavity (1325). The bottom surface of the internal detection rod (133) can abut against the upper detection surface of the workpiece (100). The detection end of the second sensor (12) abuts against the top surface of the internal detection rod (133) to detect the second displacement of the internal detection rod (133) in the first direction. When inspecting the workpiece (100), the workpiece (100) is placed in the receiving cavity (1325) and moved upward along the first direction. When the workpiece (100) moves to the limit, if the first displacement matches the preset distance and the bottom surface of the outer detection sleeve (131), the bottom surface of the middle detection sleeve (132), and the lower detection surface of the workpiece (100) are flush, then the coaxiality of the workpiece (100) is qualified; the height of the workpiece (100) matches the second displacement.

2. The composite detection device for coaxiality and height according to claim 1, characterized in that, In the detection component (13), the measurement origin of the detection end of the first sensor (11) and the detection end of the second sensor (12) is the bottom surface of the external detection sleeve (131), and the height of the workpiece (100) is the difference between the display value of the second sensor (12) and the display value of the first sensor (11).

3. The composite detection device for coaxiality and height according to claim 1, characterized in that, The outer detection sleeve (131) has a strip hole (1315) extending along the first direction on its side wall. The strip hole (1315) communicates with the through hole (1314). The middle detection sleeve (132) has a guide block (134) on its outer side wall. When the outer detection sleeve (131) and the middle detection sleeve (132) slide relative to each other, the guide block (134) moves in the strip hole (1315).

4. The composite detection device for coaxiality and height according to claim 1, characterized in that, The external detection sleeve (131) includes a first body (1311) and a first stop (1312). The first stop (1312) is connected to the top of the first body (1311). The detection end of the first sensor (11) abuts against the side of the first stop (1312) away from the first body (1311). The intermediate detection sleeve (132) includes a second body (1321) and a second stop (1322). The second stop (1322) is connected to the outer wall of the second body (1321) and located outside the external detection sleeve (131). The second stop (1322) and the first stop (1312) are spaced apart in the first direction, and a first reset member (135) is provided between the second stop (1322) and the first stop (1312).

5. The composite detection device for coaxiality and height according to claim 4, characterized in that, The outer detection sleeve (131) further includes a first protruding tooth (1313), which extends along the first direction and is connected to the bottom of the first sleeve body (1311). The middle detection sleeve (132) further includes a second protruding tooth (1323), which extends along the first direction and is connected to the bottom of the second sleeve body (1321). The bottom surface of the first protruding tooth (1313) extends beyond the bottom surface of the second protruding tooth (1323) by the preset distance, and the bottom surface of the first protruding tooth (1313) extends beyond the second protruding tooth (1323) and is offset in the circumferential direction of the detection component (13).

6. The composite detection device for coaxiality and height according to claim 1, characterized in that, The inner wall of the intermediate detection sleeve (132) is provided with a protrusion (1326) to divide the interior of the intermediate detection sleeve (132) into the sliding hole (1324) and the receiving cavity (1325). The outer peripheral side wall of the internal detection rod (133) is provided with a protruding ring (1331). The internal detection rod (133) passes through the sliding hole (1324) and is at least partially located in the receiving cavity (1325). The protruding ring (1331) can abut against the top of the protrusion (1326).

7. The composite detection device for coaxiality and height according to claim 6, characterized in that, The detection assembly (13) further includes a sealing cap (137) and a second reset member (136). The sealing cap (137) is disposed on the top of the intermediate detection sleeve (132) and the internal detection rod (133) passes through the sealing cap (137). The second reset member (136) is located inside the intermediate detection sleeve (132) and sleeved outside the internal detection rod (133). One end of the second reset member (136) is connected to the sealing cap (137), and the other end is connected to the protruding ring (1331).

8. The composite detection device for coaxiality and height according to claim 1, characterized in that, The coaxiality and height composite detection device also includes a power mechanism (2), which includes a drive component (21), a floating upper base (22) and a floating lower base (23). The floating lower base (23) can move up and down relative to the floating upper base (22). The fixed end of the drive component (21) is connected to the floating upper base (22), and the output end of the drive component (21) is connected to the floating lower base (23). The floating lower base (23) is fixedly connected to the intermediate detection sleeve (132). The drive component (21) is used to drive the floating lower base (23) to move, thereby driving the detection mechanism (1) to move closer to the workpiece (100).

9. The composite detection device for coaxiality and height according to claim 8, characterized in that, The coaxiality and height composite detection device also includes a quick-change base (3), the floating lower base (23) is connected to the quick-change base (3), and the quick-change base (3) is detachably connected to the intermediate detection sleeve (132).

10. A testing device, characterized in that, The testing equipment includes a transport platform, a lifting device, a clamping device, and a composite testing device for coaxiality and height as described in any one of claims 1-9. The transport platform includes a transport track (10) extending along the transport direction and a moving stage (20). The moving stage (20) is movably disposed on the transport track (10) and is used to carry the workpiece (100). The lifting device is disposed below the moving stage (20). The clamping device and the composite testing device for coaxiality and height are disposed opposite to each other on both sides of the transport track (10).

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