Optical contact type compound measuring platform for numerical control multi-axis linkage

Abstract

The application discloses a numerical control multi-axis linkage optical contact type composite measuring platform and relates to the technical field of measuring instruments. The application aims at the problem of the decrease of overall measuring efficiency caused by the increase of non-measuring time due to the difficulty in forming adaptive normal fitting between a probe tip and a workpiece surface and the failure to realize dynamic pose cooperative adjustment of contact points. The application can realize dynamic pose cooperative adjustment by forming a double-side driving mode between the workpiece and the probe tip. Specifically, the application completes the lifting of the workpiece to be measured in the loading space through the cooperative matching action of the rotating top ring and the upper rotating and contracting ring, and then uses the probe tip with the rotatable and deflectable action to complete the normal fitting of the workpiece part with any surface orientation, so as to finally complete the rapid contact and measurement of the probe tip and the workpiece to be measured and achieve the purpose of effectively improving the measuring efficiency under the premise of significantly reducing the non-measuring time of the workpiece to be measured.

Description

Technical Field

[0001] This invention relates to the field of measuring instrument technology, and more specifically to an optical contact composite measuring platform for CNC multi-axis linkage. Background Technology

[0002] Material surface profile analysis methods are mainly divided into two types: contact and non-contact measurement methods. Instruments that combine contact and non-contact measurement methods are called composite measuring machines, which are suitable for the form and position tolerance detection of mechanical parts and optical parts, the detection of complex curved surfaces, and the parameter calculation of high-precision optical components.

[0003] Contact measurement is a traditional measurement method that relies on the physical contact between the probe and the surface of the workpiece to obtain accurate coordinate data. The measurement process includes: probe contact, where the contact probe is moved to the surface of the workpiece by a robotic arm or fixing device; the probe of the probe gently touches the workpiece surface to ensure that it does not cause damage to the workpiece; data acquisition, where the internal sensor is triggered when the probe contacts the workpiece surface to record the precise coordinates of the contact point; and coordinate transformation, where the acquired coordinate data is transmitted to the measurement software, where it undergoes coordinate transformation and data processing to finally be converted into actual size, shape, and position information.

[0004] However, in actual contact measurement processes, the probe system and the surface of the workpiece have significant limitations in motion adaptability. These limitations are mainly manifested in the difficulty of achieving adaptive normal contact between the probe tip and the workpiece surface, and the fact that existing systems use a single-sided drive mode, which cannot achieve dynamic pose coordination adjustment of the contact point. This greatly limits the optimization space of the measurement trajectory, significantly increasing non-measurement time and leading to a decrease in overall measurement efficiency. Therefore, this application proposes a solution. Summary of the Invention

[0005] The purpose of this invention is to provide an optical contact composite measurement platform for CNC multi-axis linkage, in order to solve the problems mentioned in the background section.

[0006] The objective of this invention can be achieved through the following technical solution: an optical contact composite measurement platform for CNC multi-axis linkage, comprising a base, horizontal and vertical rails intersecting on the base, and a platform rotatably disposed above the horizontal and vertical rails; the platform contains an inward retraction assembly for positioning the workpiece to be measured; the inward retraction assembly includes an inner support ring seat and a rotating top ring rotatably disposed inside the platform; a fixed middle platform is installed in the middle of the platform; an upper retraction ring is threadedly connected to the upper end of the rotating top ring; inward retraction rods are inserted at intervals on the outer side of the fixed middle platform, with their bottoms cooperating with the upper side of the upper retraction ring; a locking rod is installed at the inner end of the inward retraction rod; an arc frame is rotatably mounted on the upper end of the outer side of the platform, and a contact for contacting the surface of the workpiece to be measured is slidably mounted on the arc frame.

[0007] The configuration is further defined as follows: a sliding block is slidably mounted on the arc frame, a motor is mounted at the bottom of the sliding block, an electric telescopic rod is mounted at the output end of the motor, and a contact is located at the output end of the electric telescopic rod, which contacts the surface of the workpiece to be tested through rotation and telescopic movements.

[0008] The base is further configured to include a frame and a concave mirror, wherein the concave surface of the concave mirror faces downward and is perpendicular to the contact in any deflection direction.

[0009] The inner retraction rod is further configured such that it is U-shaped, with one end inserted into the fixed platform and the other end extending above the fixed platform to form a mounting area.

[0010] The rotating top ring is further configured such that an internal thread is provided on the inner side of the upper end of the rotating top ring, and an external thread is provided on the outer side of the upper end of the upper retractable ring. The rotating top ring is connected to the upper retractable ring by the engagement of the internal thread and the external thread. The upper inner side cross section of the upper retractable ring is arc-shaped and abuts against the inner retractable rod.

[0011] The configuration is further defined as follows: a rotating frame connected to a rotating top ring is rotatably mounted on the bottom of the fixed platform, and a drive assembly for driving the rotating frame to rotate is mounted on the longitudinal rail.

[0012] The configuration is further defined as follows: a rotating plate is provided on the pedestal, and the arc frame is symmetrically arranged on the rotating plate to perform a horizontal rotation action, thereby driving the contact to make surface contact with workpieces of various sizes.

[0013] The system is further configured such that the horizontal rail, vertical rail, and platform are stacked from bottom to top, enabling the workpiece to move laterally, move longitudinally, and rotate. The arc frame on the platform enables the contact to deflect and rotate.

[0014] The present invention has the following beneficial effects:

[0015] This invention addresses the problem of decreased overall measurement efficiency caused by increased non-measurement time due to the difficulty in achieving adaptive normal contact between the probe tip and the workpiece surface, and the inability to achieve dynamic pose coordination adjustment of the contact point. It achieves dynamic pose coordination adjustment by forming a bilateral driving mode between the workpiece and the probe tip. Specifically, the workpiece to be measured is lowered from the mounting space through the coordinated action of the rotating top ring and the upper retracting ring. Then, the rotatable probe tip, which combines rotation and deflection, achieves normal contact with the workpiece portion facing any surface, ultimately achieving rapid contact and measurement between the probe tip and the workpiece. This significantly improves measurement efficiency while substantially reducing the non-measurement time of the workpiece.

[0016] The motor's starting action drives the contact to rotate. When the surface shape of the workpiece being measured has rotational characteristics, the rotating plate directly drives the arc frame to rotate, thereby reducing the contact's rotation "span" and ultimately significantly reducing non-measurement time. Furthermore, the infrared emitter emits infrared light to the emitting concave mirror during the contact's extension, retraction, and deflection, and receives the returned infrared light to quickly determine the current extension, retraction, and deflection position of the contact. During the measurement process, the contact position can be adjusted according to the surface shape of the workpiece being measured, significantly reducing non-measurement time and improving measurement efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the main measuring structure of the present invention;

[0020] Figure 3 This is a cross-sectional view of the main measuring structure of the present invention;

[0021] Figure 4 This is a structural exploded view of the internal shrinkage component of the present invention;

[0022] Figure 5 This is a cross-sectional view of the main measuring structure of the present invention;

[0023] Figure 6 This is a diagram showing the position transformation of the contact mechanism of the measuring main structure of the present invention;

[0024] Figure 7 This is a cross-sectional view of the overall structure of the present invention.

[0025] In the diagram: 1. Base; 2. Frame; 3. Reflecting concave mirror; 4. Horizontal rail; 5. Vertical rail; 6. Platform; 7. Arc frame; 8. Rotating plate; 9. Locking rod; 10. Sliding block; 11. Motor; 12. Electric telescopic rod; 13. Contact; 14. Fixed middle platform; 15. Inner support ring seat; 16. Rotating top ring; 17. Upper retracting ring; 18. Inner retracting rod. Detailed Implementation

[0026] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention. Example

[0027] To address the problem of increased non-measurement time and decreased overall measurement efficiency caused by the difficulty in achieving adaptive normal alignment between the probe tip and the workpiece surface and the inability to achieve dynamic pose coordination adjustment of the contact point, the following technical solution is proposed:

[0028] Reference Figure 1 - Figure 7 As shown, the optical contact composite measurement platform for CNC multi-axis linkage in this embodiment includes a base 1, a horizontal rail 4 and a vertical rail 5 that are cross-stacked on the base 1, and a platform 6 that is rotatably set above the horizontal rail 4 and the vertical rail 5; the platform 6 is provided with an inward retraction component for positioning the workpiece to be measured.

[0029] The retraction assembly includes an inner support ring seat 15 and a rotating top ring 16 rotatably mounted inside the base 6. A fixed middle platform 14 is installed in the middle of the base 6. An upper retraction ring 17 is threadedly connected to the upper end of the rotating top ring 16. An inner retraction rod 18 is inserted at intervals on the outer side of the fixed middle platform 14, and its bottom is engaged with the upper side of the upper retraction ring 17. A locking rod 9 is installed at the inner end of the inner retraction rod 18. The locking rod 9 is L-shaped and has several locking blocks on its inner side. The four symmetrically arranged locking rods 9 form a locking interval through the locking blocks to lock the position of the workpiece to be measured. The coordinated action of the rotating top ring 16 and the upper retraction ring 17 can lift the workpiece to be measured between the locking rods 9, so that the workpiece to be measured forms a single-sided driving mode and together with the probe tip forms a double-sided driving mode to achieve continuous surface measurement.

[0030] Reference Figure 6 As shown, an arc frame 7 is rotatably mounted on the upper outer side of the platform 6. A contact 13 for contacting the surface of the workpiece to be measured is slidably mounted on the arc frame 7. A sliding block 10 is slidably mounted on the arc frame 7. A motor 11 is mounted on the bottom of the sliding block 10. An electric telescopic rod 12 is mounted on the output end of the motor 11. The contact 13 is located at the output end of the electric telescopic rod 12. It contacts the surface of the workpiece to be measured through rotation and extension. The sliding block 10 on the arc frame 7 moves in an arc direction. The sliding block 10 drives the end contact 13 to move. The contact 13 can also complete the rotation and extension under the linkage of the motor 11 and the electric telescopic rod 12. During this process, the contact 13 is fitted to the surface of the workpiece to be measured in accordance with the size information of the surface part of the workpiece.

[0031] The base 1 is also equipped with a frame 2 and a reflective concave mirror 3. The concave surface of the reflective concave mirror 3 faces downward and is perpendicular to the contact 13 in any deflection direction. The sliding block 10 is equipped with an infrared emitter and an infrared receiver at the axial end position of the contact 13. The infrared emitter emits infrared light to the reflective concave mirror 3 and receives the returned infrared light during the extension and deflection of the contact 13, thereby quickly determining the extension and deflection position of the contact 13. During the measurement process, the position of the contact 13 can be adjusted according to the surface shape of the workpiece being measured, significantly reducing non-measurement time and improving measurement efficiency.

[0032] A rotating plate 8 is provided on the base 6, and an arc frame 7 is symmetrically arranged on the rotating plate 8 to perform horizontal rotation, driving the contact 13 to make contact with the surface of the workpiece to be measured in multiple sizes. The horizontal rail 4, the vertical rail 5 and the base 6 are stacked from bottom to top, so that the workpiece to be measured can achieve lateral movement, longitudinal movement and rotation. The arc frame 7 on the base 6 enables the contact 13 to deflect and rotate. As can be seen from the above, the starting action of the motor 11 can drive the contact 13 to achieve rotation. When the surface shape of the workpiece to be measured has rotational characteristics, the rotating plate 8 directly drives the arc frame 7 to rotate, thereby reducing the rotation "span" of the contact 13, and ultimately achieving the goal of significantly reducing non-measurement time.

[0033] Basic principle: When measuring the surface of a workpiece, this invention achieves dynamic pose adjustment by forming a bilateral driving mode between the workpiece and the probe tip. Specifically, the workpiece is lowered in the mounting space by the coordinated action of the rotating top ring 16 and the upper retracting ring 17. Then, the contact 13, which can rotate and deflect, is used to achieve normal contact with the workpiece part with any surface orientation. The combination of the two achieves dynamic pose adjustment, and ultimately reduces non-measurement time and improves overall measurement efficiency. Example

[0034] This embodiment is a further detailed description of the dynamic pose coordination adjustment of the contact points in Embodiment 1:

[0035] Reference Figure 3 As shown, the inner retracting rod 18 is U-shaped, with one end inserted into the fixed platform 14 and the other end extending above the fixed platform 14 to form a mounting area. The inner side of the upper end of the rotating top ring 16 has an internal thread, and the outer side of the upper end of the upper retracting ring 17 has an external thread. The rotating top ring 16 is connected to the upper retracting ring 17 by the engagement of the internal thread and the external thread. The inner cross section of the upper end of the upper retracting ring 17 is arc-shaped and abuts against the inner retracting rod 18.

[0036] The placement and pre-positioning process of the workpiece to be tested is as follows: First, according to the size of the workpiece to be tested, adjust the position of each inner shrink rod 18 in the fixed middle platform 14, and then place the workpiece to be tested on the clamping rod 9, and the clamping blocks complete the initial positioning.

[0037] The bottom of the fixed platform 14 is rotatably mounted with a rotating frame connected to the rotating top ring 16. The longitudinal rail 5 is equipped with a drive assembly for driving the rotating frame to rotate. The drive assembly includes a drive motor A to drive the rotating top ring 16 to rotate, which will not be described in detail here.

[0038] The rotating top ring 16 is driven to rotate by the drive motor A specified in the drive assembly. The drive motor A drives the rotating top ring 16 to rotate, and the rotating top ring 16 drives the upper retractable ring 17 to rotate through the meshing of the internal and external threads. The top side of the upper retractable ring 17 generates a vertical lifting action. The lifting of the upper retractable ring 17 causes the inner retractable ring 18 to retract inward, which ultimately causes the clamping rod 9 to change position. Finally, the workpiece to be measured on the clamping rod 9 completes the position change under the premise of adapting size. After the position change of the workpiece to be measured is completed, the relative position between the workpiece to be measured and the contact 13 also changes accordingly. The combination of the two realizes the relative change of the measurement contact point after the consecutive steps, which also fundamentally reduces the time consumed by non-measurement steps and improves measurement efficiency.

[0039] It should be added that: the horizontal rail 4 and the vertical rail 5 can also provide horizontal comprehensive displacement movement, which, together with the above-mentioned position adjustment, achieves multi-axis linkage optical contact composite measurement and realizes accurate measurement. Example

[0040] Reference Figures 1-7 As shown, the optical contact composite measurement method for CNC multi-axis linkage includes the following steps:

[0041] Step 1: First, adjust the position of each inner shrink rod 18 in the fixed middle platform 14 according to the size of the workpiece to be measured, and then place the workpiece to be measured on the clamping rod 9 and complete the initial positioning by the clamping block.

[0042] Step 2: Then start the drive motor A to drive the rotating top ring 16 to rotate. The rotating top ring 16 drives the upper retracting ring 17 to rotate through the meshing of the internal thread and the external thread. The top side of the upper retracting ring 17 produces a vertical lifting action. The lifting of the upper retracting ring 17 drives the inner retracting ring 18 to produce an inward retraction deformation, which ultimately drives the clamping rod 9 to change position, so as to achieve accurate positioning of the workpiece to be measured between the clamping rods 9.

[0043] Step 3: The contact 13 is set at the output end of the electric telescopic rod 12 and contacts the surface of the workpiece to be tested through rotation and extension. The sliding block 10 on the arc frame 7 moves in an arc direction. The sliding block 10 drives the end contact 13 to move. The contact 13 can also complete the rotation and extension under the linkage of the motor 11 and the electric telescopic rod 12. During this process, the contact 13 is fitted to the surface of the workpiece to be tested in accordance with the size information of the surface part.

[0044] Step 4: In step 3, infrared light is emitted to the concave mirror 3 during the extension and deflection of the contact 13 by the infrared emitter and the returned infrared light is received, so as to quickly know the extension and deflection position of the contact 13. During the measurement process, the position of the contact 13 can be adjusted according to the surface shape of the workpiece being measured, which significantly reduces non-measurement time and improves measurement efficiency.

[0045] Step 5: After the measurement is completed, reset all components and continue with the surface measurement of the next workpiece.

[0046] In summary, this invention, in combination with Embodiments 1, 2, and 3, enables dynamic pose coordination adjustment by forming a bilateral driving mode between the workpiece and the probe tip. Specifically, through the coordinated action of the rotating top ring and the upper retracting ring, the workpiece to be measured in the mounting space is lowered. Then, the rotatable probe tip, which combines deflection action, is used to achieve normal contact with the workpiece part with any surface orientation. Finally, the probe tip and the workpiece to be measured are quickly contacted and measured, thereby effectively improving measurement efficiency while significantly reducing the non-measurement time of the workpiece to be measured.

[0047] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. An optical contact composite measurement platform for CNC multi-axis linkage, characterized in that, Includes a base (1), a horizontal rail (4) and a vertical rail (5) that are cross-stacked on the base (1), and a platform (6) that is rotatably set above the horizontal rail (4) and the vertical rail (5). The platform (6) is provided with an internal retraction component for positioning the workpiece to be tested; the internal retraction component includes an inner support ring seat (15) and a rotating top ring (16) rotatably disposed inside the platform (6); a fixed middle platform (14) is installed in the middle of the platform (6); an upper retraction ring (17) is threadedly connected to the upper end of the rotating top ring (16); internal retraction rods (18) are inserted at intervals on the outer side of the fixed middle platform (14) and their bottoms cooperate with the upper side of the upper retraction ring (17); a locking rod (9) is installed at the inner end of the internal retraction rod (18); An arc frame (7) is rotatably mounted on the upper end of the outer side of the platform (6), and a contact (13) for contacting the surface of the workpiece to be tested is slidably mounted on the arc frame (7). A sliding block (10) is slidably mounted on the arc frame (7). A motor (11) is mounted on the bottom of the sliding block (10). An electric telescopic rod (12) is mounted on the output end of the motor (11). The contact (13) is located at the output end of the electric telescopic rod (12) and contacts the surface of the workpiece to be tested through rotation and extension. The base (1) is also provided with a frame (2) and a reflective concave mirror (3), the concave surface of the reflective concave mirror (3) faces downward and is perpendicular to the contact (13) in any deflection direction; The upper end of the rotating top ring (16) has an internal thread on the inner side, and the upper end of the upper shrink ring (17) has an external thread on the outer side. The rotating top ring (16) is connected to the upper shrink ring (17) by meshing the internal thread and the external thread. The upper end of the upper shrink ring (17) has an arc-shaped cross section and abuts against the inner shrink rod (18). A rotating plate (8) is provided on the pedestal (6). The arc frame (7) is symmetrically arranged on the rotating plate (8) to perform horizontal rotation, driving the contact (13) to make surface contact with the workpiece of various sizes. The horizontal rail (4), the vertical rail (5) and the pedestal (6) are stacked from bottom to top, so that the workpiece to be tested can achieve horizontal movement, vertical movement and rotation. The arc frame (7) on the pedestal (6) enables the contact (13) to achieve deflection and rotation.

2. The optical contact composite measurement platform for CNC multi-axis linkage according to claim 1, characterized in that, The inner retractable rod (18) is U-shaped, with one end inserted into the fixed platform (14) and the other end extending above the fixed platform (14) to form a mounting area.

3. The optical contact composite measurement platform for CNC multi-axis linkage according to claim 1, characterized in that, The bottom of the fixed platform (14) is rotatably mounted with a rotating frame connected to the rotating top ring (16), and a drive assembly for driving the rotating frame to rotate is mounted on the longitudinal rail (5).

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