Edge profile laser detector with turntable

Abstract

The present invention relates to the technical field of laser detection equipment, and discloses an edge profile laser detector with a turntable, which includes a bed body, a detection fixture, a turntable and a laser detection head. The detection fixture is installed at the power output end of the turntable, and the driving part of the turntable is located inside the bed body and is configured with a driving unit for driving it to drive the detection fixture to rotate. Both the laser detection head and the turntable are connected to the control unit, and the control unit is configured to control the driving unit to drive the turntable to rotate by a corresponding angle according to a set detection path, and at the same time control the laser detection head to perform static or dynamic scanning on the part to be detected of the workpiece clamped by the detection fixture to measure the edge profile data of the workpiece; and send the edge profile data of the workpiece to the data processing unit for processing to obtain the measurement error and send it to the display terminal. By configuring a turntable for the detection fixture and integrating the laser measurement technology, the present invention can achieve high-precision, high-efficiency and all-round measurement of the blade edge.

Description

Technical Field

[0001] The present invention relates to the technical field of laser detection equipment, in particular to an edge profile laser detector with a turntable, and more particularly to an edge profile laser detector for blades with a turntable. Background Art

[0002] In many industrial fields, such as the blades of aeroengines, the blades of wind turbines, etc., the quality and precision of the blades play a crucial role in the performance, efficiency, and reliability of the equipment. The shape and dimensional accuracy of the blade edge directly affect the aerodynamic performance, mechanical strength, and stability of the blade during equipment operation. Traditional blade edge measurement methods, such as using contact measuring tools like calipers and micrometers for measurement, not only have low efficiency but also easily cause scratches on the blade surface during the measurement process, affecting the surface quality and service life of the blade. At the same time, contact measurement is difficult to achieve comprehensive and accurate measurement for blades with complex shapes, there are measurement blind spots, resulting in the measurement results unable to accurately reflect the actual situation of the blade.

[0003] Some existing non-contact measurement technologies, such as optical projection measurement, ultrasonic measurement, etc., although overcome some of the disadvantages of contact measurement to a certain extent, also have their own limitations. 1) Optical projection measurement is sensitive to the roughness and reflectivity characteristics of the blade surface. When there are textures or coatings on the blade surface, the measurement accuracy will be greatly affected. 2) Ultrasonic measurement is more sensitive to changes in the internal structure of the blade, while the measurement accuracy for the precise dimensions of the blade edge is limited. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide an edge profile laser detector with a turntable, which can achieve high-precision, high-efficiency, and all-round measurement of the blade edge by configuring a turntable for the detection fixture and integrating laser measurement technology.

[0005] The edge profile laser detector with a turntable, the laser detector includes a bed body with a hollow structure inside, and a detection fixture installed on the workbench surface of the bed body. The laser detector further includes a turntable located at the bottom of the detection fixture and a laser detection head on one side of the central axis of the detection fixture. The detection fixture is installed at the power output end of the turntable, and the driving part of the turntable is located inside the bed body and is configured with a driving unit for driving it to drive the detection fixture to rotate;

[0006] The laser detection head and the turntable are both connected to a control unit, and the control unit is configured to: control the drive unit to drive the turntable to rotate by a corresponding angle according to a set detection path, and at the same time control the laser detection head to perform static or dynamic scanning on the part to be detected of the workpiece clamped by the detection fixture to measure the workpiece edge profile data; wherein, the dynamic scanning is performed based on the static scanning, and the workpiece edge profile data obtained by the dynamic scanning is corrected according to the comparison error between the workpiece edge profile data obtained by the dynamic scanning and the static scanning respectively.

[0007] The laser detection head is connected to a data processing unit, and the data processing unit at least includes a model generator, a comparison module and a result output module; the model generator is configured to: receive the workpiece edge profile data measured by the laser detection head and use model software to construct a three-dimensional workpiece profile model; the comparison module is configured to: retrieve corresponding key parameters from the three-dimensional workpiece profile model according to the set measurement information and compare them one by one with the preset standard parameters to calculate the measurement error; the result output module is configured to: send the measurement error to a display terminal in a preset format.

[0008] Optionally, the laser detection head is set as a multi-path laser scanning head, the multi-path laser scanning head includes a main detection head and a plurality of sub-detection heads, and at least one overlapping common detection interval is provided in any two or more of the scanning paths of the main detection head and the plurality of sub-detection heads along the extension direction thereof.

[0009] Optionally, the detection fixture includes a base, an installation groove is formed at the top of the base, and a plurality of first cavities and / or second cavities are formed in the side wall of the installation groove. A positioning tooling is installed in the first cavity, and a clamping tooling is installed in the second cavity.

[0010] Optionally, the first cavity is set as a T-shaped structure composed of a vertical part and a horizontal part, and the positioning tooling includes:

[0011] A first telescopic member is arranged in the vertical part of the first cavity, and the output end of the first telescopic member extends towards the side close to the installation groove and into the horizontal part.

[0012] A positioning plate is arranged in the horizontal part of the first cavity and is connected to the output end of the first telescopic member, and a limiting part is arranged at one end of the positioning plate away from the first telescopic member.

[0013] Optionally, the second cavity is set as a rake tooth structure, and a plurality of activity chambers, an air storage chamber and a fixed chamber that are communicated with each other are sequentially arranged in the rake tooth structure along the direction away from the installation groove; the clamping tooling includes:

[0014] The second telescopic member is installed in the fixed chamber, and the output end of the second telescopic member extends into the air storage chamber;

[0015] The first piston is slidably installed in the air storage chamber and connected to the output end of the second telescopic member;

[0016] A plurality of second pistons are provided, and the number of the second pistons corresponds to the number of the activity chambers one by one. Each second piston is slidably installed in the corresponding activity chamber, and a sealed air storage space is formed between the second piston and the first piston, and compressed air is stored in the air storage space;

[0017] A plurality of fixing rods are provided, and the number of the fixing rods corresponds to at least the number of the second pistons one by one. The fixing rods are arranged in the activity chambers, and one end of the fixing rod is connected to the end of the second piston away from the first piston, and the other end of the fixing rod extends into the installation groove and is provided with a clamping portion.

[0018] Optionally, the clamping portion is provided as an elastic plate, and a plurality of the clamping portions are provided as a split or integral structure;

[0019] Wherein, when a plurality of the clamping portions are provided as an integral structure, a plurality of interconnected universal joints are installed between the opposite surfaces of the fixing rod and the clamping portion.

[0020] Optionally, one end of the activity chamber and on the side close to the installation groove extends inwards along the circumference to form an annular or multi-toothed limiting platform, and a return spring is installed between the second piston and the limiting platform;

[0021] The deformation amount of the return spring is greater than the displacement amount between the clamping portion and the surface of the workpiece;

[0022] The injection pressure of the compressed air is lower than or equal to the deformation force of the return spring.

[0023] Optionally, the laser detection head is configured with a three-coordinate displacement structure, and the three-coordinate displacement structure includes:

[0024] A tangential movement module is arranged on the workbench surface of the machine tool bed;

[0025] An axial movement module is installed at the output end of the tangential movement module;

[0026] A radial movement module is installed at the output end of the axial movement module;

[0027] The laser detection head is installed at the output end of the radial movement module, and the scanning end of the laser detection head is arranged towards the central axis of the detection fixture;

[0028] The tangential movement module, the axial movement module, and the radial movement module are all set as linear displacement structures and are connected to the control unit.

[0029] Optionally, the driving part of the turntable is set as a toothed ring, the driving unit includes a driving motor and a gear arranged at the output end of the driving motor, and the gear meshes with the toothed ring.

[0030] Optionally, both the positioning tooling and the clamping tooling are configured with power modules, and the cables of the positioning tooling and the clamping tooling are respectively connected to the power module and / or the control unit via wire winding wheels;

[0031] The turntable is provided with a mounting hole along the central axis direction, the wire winding wheel is inserted into the mounting hole and connected to the lining plate of the bed body. One end of the wire winding wheel close to the base is spirally provided with several turns of wiring grooves starting from its central axis. A wire arranging ring is arranged on the outer peripheral side of the wiring groove, and a wire passing port communicating with the edge side of the wiring groove is opened on the wire arranging ring, and a wiring port is opened on the central side of the wiring groove;

[0032] A clockwork spring is coiled and installed in the wiring groove, and a plurality of wire clamping clips are arranged along the extending direction of the clockwork spring for clamping and arranging the cables;

[0033] One end of the clockwork spring is installed on one side of the wiring port of the wiring groove, and the other end of the clockwork spring passes through the wire passing port and is provided with a connecting part, and the connecting part is connected to the bottom of the base;

[0034] When the connecting part rotates around the wire arranging ring at the wire passing port in the initial state, the clockwork spring is gradually tightened and contracted, realizing the stretching of the cable.

[0035] The beneficial effects that the present invention can produce include:

[0036] 1. The edge profile laser detector with a turntable provided by the present invention realizes static or dynamic scanning through the cooperation of the turntable and the laser detection head, can perform omnidirectional measurement on the blade surface, obtain comprehensive data, and avoid measurement blind spots. At the same time, a multi-path laser scanning head is designed to effectively increase the scanning coverage area, can simultaneously scan multiple detection surfaces of the edge profile of the special-shaped blade, avoid missing the scanning of local structures, and precisely adjust the position of the detection head in combination with the three-coordinate displacement structure to ensure the measurement accuracy. And the workpiece is calibrated through the positioning tooling to ensure that the centers of the fixture coordinate system and the workpiece coordinate system coincide, eliminate the measurement parameter deviation between models, and make the measurement error calculated by the comparison module more accurate.

[0037] 2. In the present invention, the clamping tooling of the detection fixture adopts a unique rake tooth structure and is driven by compressed air, which is suitable for clamping the tenons of blades of various shapes. Compared with the traditional three-jaw chuck, the installation reliability is higher. At the same time, the clamping part is made of elastic plate material, which can avoid scratching the surface of the workpiece, and can be flexibly adjusted according to the shape of the workpiece. The integrated structure also achieves a tight fit through a universal joint. And the clamping tooling is designed with a return spring to ensure that the clamping part is separated in the initial state for easy installation and can automatically reset after the measurement is completed, improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a schematic structural diagram of the edge profile laser detector with a turntable according to the present invention;

[0039] Figure 2 In the present invention Figure 1 is a schematic partial structural diagram of the bed body;

[0040] Figure 3 In the present invention Figure 2 is a cross-sectional view of the detection fixture;

[0041] Figure 4 In the present invention Figure 3 is an enlarged view at A;

[0042] Figure 5 In the present invention Figure 2 is a top view of the turntable and the wire winding wheel;

[0043] Figure 6 In the present invention Figure 1 is a schematic structural diagram of the scanning path of the laser detection head;

[0044] Figure 7 In the present invention Figure 1 is a schematic diagram of the data flow architecture of the data processing unit;

[0045] In the figure: 1. Bed body, 2. Detection fixture, 3. Turntable, 4. Laser detection head, 5. Control unit, 6. Data processing unit, 7. Model generator, 8. Comparison module, 9. Result output module, 10. Display terminal, 11. Base, 12. Installation groove, 13. First cavity, 14. Second cavity, 15. First telescopic member, 16. Positioning plate, 17. Second telescopic member, 18. First piston, 19. Second piston, 20. Fixed rod, 21. Universal joint, 22. Return spring, 23. Tangential movement module, 24. Axial movement module, 25. Radial movement module, 26. Tooth ring, 27. Gear, 28. Driving motor, 29. Power supply module, 30. Wire winding wheel, 31. Wiring groove, 32. Wiring ring, 33. Threading port, 34. Wiring port, 35. Spring, 36. Wire clamping clip, 37. Connecting part, 38. Cable, 39. Clamping part, 40. Air injection nozzle. Detailed implementation manners

[0046] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0047] Please refer to Figure 1 and Figure 2 As shown, the present invention provides an edge profile laser detector with a turntable. The laser detector includes a bed body 1 with a hollow structure inside, a detection fixture 2 installed on the workbench surface of the bed body 1, a turntable 3 located at the bottom of the detection fixture 2, and a laser detection head 4 on one side of the central axis of the detection fixture 2. Among them, the detection fixture 2 is stably installed at the power output end of the turntable 3, and the driving part of the turntable 3 is located inside the bed body 1 and is configured with a driving unit for driving it to drive the detection fixture 2 to rotate; both the laser detection head 4 and the turntable 3 are connected to a control unit 5, and the control unit 5 is configured to accurately control the driving unit to drive the turntable 3 to rotate by a corresponding angle according to a set detection path, and at the same time control the laser detection head 4 to perform static or dynamic scanning on the part to be detected of the workpiece clamped by the detection fixture 2 to measure the edge profile data of the workpiece, so as to realize the all-round measurement of the blade surface, obtain more comprehensive and detailed measurement data, and provide strong support for subsequent result analysis. Among them, the dynamic scanning is performed based on the static scanning, and the edge profile data of the workpiece obtained by the dynamic scanning is corrected according to the comparison error between the edge profile data of the workpiece obtained by the dynamic scanning and the static scanning respectively. Such as Figure 7As shown, the laser detection head 4 is connected to a data processing unit 6, and the data processing unit 6 at least includes a model generator 7, a comparison module 8, and a result output module 9; the model generator 7 is configured to receive the workpiece edge profile data measured by the laser detection head 4 and use model software to construct a three-dimensional workpiece profile model; the comparison module 8 is configured to retrieve corresponding key parameters from the three-dimensional workpiece profile model according to the set measurement information and compare them one by one with the preset standard parameters to calculate the measurement error; the set measurement information includes keyword fields such as parameter name, accuracy requirement, and measurement part, and at the same time, the standard parameters corresponding to each measurement information are set and saved in the parameter database, and an indexing mechanism is established for the standard parameters in the parameter database and the key parameters in the three-dimensional workpiece profile model, and the two are associated through a unique identifier (such as workpiece number, model ID, etc.), so that when comparing, the corresponding standard parameters and actual workpiece parameters can be quickly located, improving the data retrieval efficiency. The result output module 9 is configured to send the measurement error to the display terminal 10 in a preset format (such as xml, txt, xls, DFQ, csv, etc.). Thus, by configuring the turntable 3 for the detection fixture 2 and integrating the laser measurement technology, high-precision, high-efficiency, and all-round measurement of the blade edge can be achieved.

[0048] In the above, it should be noted that: in the static scanning mode, when the workpiece rotates to any angle to be measured along the set detection path, the laser detection head 4 performs a scanning operation on the surface of the workpiece once. This scanning method is applicable to the case where the scanning range of the laser detection head 4 can fully cover the area to be measured on the blade surface. In the dynamic scanning mode, there are two specific situations: one is that while the workpiece rotates by a corresponding angle along the set detection path, the laser detection head 4 performs synchronous scanning. The other is that after the workpiece rotates to any angle to be measured, the laser detection head 4 performs mobile scanning; at this time, the dynamic scanning is configured as follows: the laser detection head 4 performs a static scanning operation on the surface of the workpiece once to construct an initial coordinate system for static scanning, and extends the initial coordinate system for static scanning along the corresponding measurement direction based on the surface shape parameters of the workpiece to generate a coordinate system for dynamic scanning. The laser detection head 4 performs dynamic scanning along the set detection path to measure the edge contour data of the workpiece to construct a three-dimensional contour model of the workpiece in the coordinate system for dynamic scanning. Specifically, the mobile scanning method includes: the laser detection head 4 first performs a static scanning mode to perform a scanning operation on the surface of the workpiece once, and measures some of the edge contour data of the workpiece. At this time, the model generator 7 constructs an initial coordinate system for static scanning with the part of the edge contour data of the workpiece measured by the laser detection head 4 in real time, and extends the initial coordinate system for static scanning along the corresponding measurement direction based on the surface shape parameters of the workpiece to generate a coordinate system for dynamic scanning. Then, it controls the laser detection head 4 to move along the set detection path to perform dynamic scanning to measure the complete edge contour data of the workpiece, so that the model generator 7 constructs a complete three-dimensional contour model of the workpiece in the coordinate system for dynamic scanning, thereby realizing the omnidirectional measurement of the blade edge. At the same time, based on the edge contour data of the workpiece measured by static scanning as a reference to construct a coordinate system for dynamic scanning, it can correct the edge contour data of the workpiece obtained by the laser detection head 4 in the dynamic scanning mode to eliminate the measurement errors caused by the laser beam emission delay during the movement of the laser detection head 4 or the interference of the edge contour data of the workpiece obtained by transient measurement during uploading, and ensure the measurement accuracy. It is worth noting that the dynamic scanning mode can obtain multiple sets of continuous edge contour data of the workpiece, and is particularly applicable to the scenario where the scanning range of the laser detection head 4 cannot fully cover the area to be measured on the blade surface. For example, when the edge contour structure of the blade is complex and diverse, or the size is too large, resulting in the inability of the laser detection head 4 to obtain complete edge contour data of the workpiece in a single scan, the dynamic scanning mode can play its unique advantages.

[0049] In the above, the model generator 7 has CAD model import and export functions, and can import CAD mathematical models in formats such as PRT, VDAFS, IGES, DXF, and DWG. At the same time, it can input the measured workpiece edge contour data into a format that can be read by model software such as Unigraphics, Pro / E, and CATIA, and the three-dimensional contour model of the workpiece and the point cloud distribution can be displayed in the CAD interface.

[0050] In the above, the laser detection head 4 generates corresponding measurement tasks based on the software model of the workpiece (such as the UG model) and saves them to the configuration file. When measuring workpieces of the same specification subsequently, the laser detection head 4 can retrieve the corresponding measurement tasks from the configuration file and scan the surface of the workpiece along the set detection path to measure the workpiece edge contour data. Among them, the measurement tasks in the configuration file are configured to automatically generate a specified cross-section measurement program using dialog box parameters. Users can flexibly adjust the dialog box parameters of the measurement tasks according to actual measurement needs to achieve real-time acquisition of the intake and exhaust edge contours of the specified cross-section of the blade and complete accurate three-dimensional measurement.

[0051] Furthermore, as Figure 6 shown, the laser detection head 4 is set as a multi-path laser scanning head (the model can be selected as X8060). The multi-path laser scanning head includes a main detection head and several sub-detection heads. At least one overlapping common detection interval is set in any two or more of the scanning paths of the main detection head and several sub-detection heads along their extension directions, thereby effectively increasing the scanning coverage area. It can simultaneously scan multiple detection surfaces of the blade edge contour with a special shape, is suitable for accurately measuring the surface of a blade with a complex structure, effectively avoids the problem of missing local structure scanning, and significantly improves the measurement accuracy and efficiency.

[0052] Furthermore, as Figure 3As shown in the figure, the detection fixture 2 includes a base 11. An installation groove 12 is formed at the top of the base 11. A plurality of first cavities 13 and / or second cavities 14 are formed in the side wall of the installation groove 12. A positioning tooling is installed in the first cavity 13, and a clamping tooling is installed in the second cavity 14. When clamping and installing the workpiece, at least two sets of symmetrically arranged positioning toolings can be used to calibrate and align the workpiece, so as to ensure that the centers of the two coincide when establishing the fixture coordinate system and the workpiece coordinate system. It should be noted that the fixture coordinate system is the simulation coordinate system of the workpiece software model, which is a fixed value; the working coordinate system is determined by the actual installation position coordinates of the workpiece, that is, the coordinate position actually measured by the laser measuring head on the surface of the workpiece. Since the workpiece has an installation error, the working coordinate system is a variable value. At this time, calibrating the installation position of the workpiece through the positioning tooling can ensure that the centers of the fixture coordinate system and the workpiece coordinate system coincide, eliminate the measurement parameter deviation between the standard model and the three-dimensional contour model of the workpiece during the software model modeling process, and ensure the accuracy of calculating the measurement error by the comparison module 8.

[0053] In the above, as Figure 3 shown, the first cavity 13 is arranged in a T-shaped structure composed of a vertical part and a horizontal part. The positioning tooling includes a first telescopic member 15 and a positioning plate 16. Among them, the first telescopic member 15 is arranged in the vertical part of the first cavity 13, and the output end of the first telescopic member 15 extends toward the side close to the installation groove 12 and into the horizontal part; the positioning plate 16 is arranged in the horizontal part of the first cavity 13 and is connected to the output end of the first telescopic member 15, and a limiting portion is provided at one end of the positioning plate 16 away from the first telescopic member 15. Specifically, the positioning plate 16 is a V-shaped block, and the limiting portions formed on both sides of the opening of the V-shaped block can limit the workpiece in the horizontal direction.

[0054] In the above, as Figure 3As shown in the figure, the second cavity 14 is arranged in a rake tooth structure. The rake tooth structure is sequentially provided with a plurality of interconnected activity chambers, air storage chambers, and fixed chambers in a direction away from the installation groove 12; the clamping tooling includes a second telescopic member 17, a first piston 18, and a plurality of second pistons 19 and fixing rods 20; wherein, the second telescopic member 17 is installed in the fixed chamber, and the output end of the second telescopic member 17 extends into the air storage chamber; the first piston 18 is slidably installed in the air storage chamber and is connected to the output end of the second telescopic member 17; the second pistons 19 are arranged in one-to-one correspondence with the number of activity chambers. Each second piston 19 is slidably installed in the corresponding activity chamber, and a sealed air storage space is formed between the second piston 19 and the first piston 18. An air injection nozzle 40 is provided on the top of the air storage space and close to the activity chamber side, which is convenient for injecting compressed air into the assembled clamped workpiece through the air injection nozzle 40, so that compressed air is stored in the air storage space to synchronously drive the movement of multiple second pistons 19; the fixing rods 20 are arranged in at least one-to-one correspondence with the number of second pistons 19. The fixing rods 20 are arranged in the activity chambers, and one end of the fixing rod 20 is connected to the end of the second piston 19 away from the first piston 18, and the other end of the fixing rod 20 extends into the installation groove 12 and is provided with a clamping portion 39. When a workpiece (such as the tenon of a blade) is installed in the installation groove 12, the second telescopic member 17 is controlled to output and push the first piston 18 to move towards the side close to the activity chamber. At this time, the first piston 18 squeezes the compressed air to push the multiple second pistons 19 to move synchronously. And when several of the clamping portions 39 come into contact with the workpiece surface in advance, the resistance received by the corresponding second piston 19 increases. Therefore, a large amount of compressed air will flow into the remaining activity chambers until the resistance borne by all the second pistons 19 is the same, completing the clamping and fixing of the workpiece. This clamping method is applicable to the tenons of various-shaped blades (such as polygons, rectangles, cylinders, etc.). Compared with the traditional three-jaw chuck, the reliability of workpiece installation is greatly improved, and it has wide applicability.

[0055] Specifically, as Figure 3 and Figure 4 shown in the figure, the clamping portion 39 is made of elastic plate material, which can not only avoid scratching the workpiece surface but also flexibly adjust according to the workpiece shape. The multiple clamping portions 39 are arranged in a split or integral structure. When the multiple clamping portions 39 are arranged in an integral structure, a plurality of interconnected universal joints 21 are installed between the opposite surfaces of the fixing rod 20 and the clamping portion 39. When the workpiece surface is irregular, under the action of the tension of the clamping portion 39, the fixing rod 20 continuously pushes the universal joint 21 to move, which can change the axes of the multiple universal joints 21, so that the clamping portion 39 closely fits the workpiece surface and smoothly completes the clamping action, thereby matching the clamping portion 39 with the corresponding structure according to the surface shape of the workpiece.

[0056] Furthermore, as Figure 4As shown, a ring-shaped or multi-toothed limiting platform extending inward along the periphery is formed at one end of the activity room and close to one side of the installation groove 12. A return spring 22 is installed between the second piston 19 and the limiting platform; the deformation amount of the return spring 22 is greater than the displacement amount between the clamping portion 39 and the workpiece surface; the injection pressure of the compressed air is lower than or equal to the deformation force of the return spring 22. Thus, it is ensured that the second piston 19 will not be pushed by the compressed air in the initial state, so that the clamping portions 39 in multiple clamping jigs remain separated, facilitating the installation of the workpiece; after the workpiece measurement task is completed, the elastic force of the return spring 22 can quickly reset the clamping portion 39 to prepare for the next use.

[0057] Further, as Figure 1 shown, the laser detection head 4 is configured with a three-coordinate displacement structure. The three-coordinate displacement structure includes a tangential movement module 23, an axial movement module 24, and a radial movement module 25. The tangential movement module 23 is arranged on the workbench surface of the machine tool body 1; the axial movement module 24 is installed at the output end of the tangential movement module 23; the radial movement module 25 is installed at the output end of the axial movement module 24; the laser detection head 4 is installed at the output end of the radial movement module 25, and the scanning end of the laser detection head 4 is arranged towards the central axis of the detection fixture 2; the tangential movement module 23, the axial movement module 24, and the radial movement module 25 are all set as linear displacement structures and are connected to the control unit 5, such as adopting a lead screw nut pair drive structure or a pneumatic linear displacement structure. By setting the three-coordinate displacement structure, the initial position of the laser detection head 4 can be accurately adjusted in the X-axis, Y-axis, and Z-axis directions, which is not only convenient for adjusting the initial position of the laser detection head 4 to coincide with the reference line of the workpiece software model before measurement, but also can realize flexible dynamic scanning during the measurement process.

[0058] Further, as Figure 2 shown, the driving part of the turntable 3 is set as a toothed ring 26. The driving unit includes a driving motor 28 and a gear 27 arranged at the output end of the driving motor 28. The gear 27 meshes with the toothed ring 26. Specifically, the driving motor 28 adopts a DC servo motor, which can make the driving motor 28 move at a T-curve speed or an S-curve speed to ensure the stable and reliable movement state of the machine.

[0059] In the above, as Figure 2 and Figure 5As shown, both the first telescopic member 15 and the second telescopic member 17 adopt electric push rods. Therefore, power modules 29 are configured for both the positioning tooling and the clamping tooling. Considering that the inspection fixture 2 needs to rotate during actual use, to prevent damage or poor contact of the lines during the stretching process, the cables 38 of the positioning tooling and the clamping tooling are respectively connected to the power module 29 and / or the control unit 5 via wire winding wheels 30. Specifically, an installation hole is formed in the turntable 3 along the central axis direction, and the wire winding wheel 30 is inserted into the installation hole and fixedly connected to the lining plate of the machine bed 1. A plurality of turns of wiring grooves 31 are spirally arranged at one end of the wire winding wheel 30 close to the base 11 starting from its central axis. A wire arranging ring 32 is arranged on the outer peripheral side of the wiring grooves 31, and a wire passing port 33 communicating with the edge side of the wiring grooves 31 is formed in the wire arranging ring 32. A wiring port 34 is formed in the central side of the wiring grooves 31. A clock spring 35 is coiled and installed in the wiring grooves 31. A plurality of wire clamping clips 36 are arranged along the extending direction of the clock spring 35 for clamping the arranged cable 38. One end of the clock spring 35 is installed on one side of the wiring port 34 of the wiring grooves 31, and the other end of the clock spring 35 passes through the wire passing port 33 and is provided with a connecting portion 37. The connecting portion 37 is hinged to the bottom of the base 11 through a pin shaft. In the initial state, when the connecting portion 37 rotates around the wire arranging ring 32 at the wire passing port 33, the clock spring 35 is gradually tightened and contracted, realizing the stretching of the cable 38. Similarly, when the turntable 3 rotates in the reverse direction to drive the base 11 to rotate, the connecting portion 37 is reset. At this time, the clock spring 35 gradually expands, tightening the cable 38 inside the wire winding wheel 30, effectively ensuring the normal operation of the line.

Claims

1. Edge contour laser detector with a turntable, the laser detector comprising a bed body (1) with a hollow structure inside, and a detection fixture (2) installed on the workbench surface of the bed body (1), characterized in that, The laser detector further includes a turntable (3) located at the bottom of the detection fixture (2) and a laser detection head (4) on one side of the central axis of the detection fixture (2). The detection fixture (2) is installed at the power output end of the turntable (3), and the driving part of the turntable (3) is located inside the machine bed (1) and is configured with a driving unit for driving it to drive the detection fixture (2) to rotate; Both the laser detection head (4) and the turntable (3) are connected to a control unit (5). The control unit (5) is configured to: control the driving unit to drive the turntable (3) to rotate by a corresponding angle according to a set detection path, and at the same time control the laser detection head (4) to perform static or dynamic scanning on the part to be detected of the workpiece clamped by the detection fixture (2) to measure the workpiece edge contour data; wherein, the dynamic scanning is performed based on the static scanning, and the workpiece edge contour data obtained by the dynamic scanning is corrected according to the comparison error between the workpiece edge contour data obtained by the dynamic scanning and the static scanning respectively; The laser detection head (4) is connected to a data processing unit (6). The data processing unit (6) at least includes a model generator (7), a comparison module (8) and a result output module (9); The model generator (7) is configured to: receive the workpiece edge contour data measured by the laser detection head (4) and use model software to construct a three-dimensional contour model of the workpiece; The comparison module (8) is configured to: retrieve corresponding key parameters from the three-dimensional contour model of the workpiece according to the set measurement information and compare them with the preset standard parameters one by one to calculate the measurement error; The result output module (9) is configured to: send the measurement error to the display terminal (10) according to a preset format; The laser detection head (4) is set as a multi-path laser scanning head. The multi-path laser scanning head includes a main detection head and several sub-detection heads. At least one overlapping common detection interval is provided in any two or more of the scanning paths of the main detection head and several sub-detection heads along their extension directions; The detection fixture (2) includes a base (11). An installation groove (12) is opened at the top of the base (11). Several first cavities (13) and / or second cavities (14) are opened on the side wall of the installation groove (12). A positioning tooling is installed in the first cavity (13), and a clamping tooling is installed in the second cavity (14).

2. The edge profile laser detector with a turntable according to claim 1, characterized in that The first cavity (13) is set as a T-shaped structure composed of a vertical part and a horizontal part. The positioning tooling includes: A first telescopic member (15) is arranged in the vertical part of the first cavity (13), and the output end of the first telescopic member (15) extends towards the side close to the installation groove (12) and into the horizontal part; A positioning plate (16) is arranged in the horizontal part of the first cavity (13) and is connected to the output end of the first telescopic member (15), and a limiting part is arranged at one end of the positioning plate (16) away from the first telescopic member (15).

3. The edge profile laser detector with a turntable according to claim 1, characterized in that, The second cavity (14) is arranged in a rake tooth structure, and the rake tooth structure is sequentially provided with a plurality of activity chambers, an air storage chamber and a fixing chamber which are communicated with each other in a direction away from the installation groove (12); The clamping tooling includes: A second telescopic member (17) is installed in the fixing chamber, and the output end of the second telescopic member (17) extends into the air storage chamber; A first piston (18) is slidably installed in the air storage chamber and connected to the output end of the second telescopic member (17); A plurality of second pistons (19) are arranged in one-to-one correspondence with the number of the activity chambers. Each of the second pistons (19) is slidably installed in the corresponding activity chamber, and a sealed air storage space is formed between the second piston (19) and the first piston (18), and compressed air is stored in the air storage space; A plurality of fixing rods (20) are arranged in at least one-to-one correspondence with the number of the second pistons (19). The fixing rods (20) are arranged in the activity chambers, and one end of the fixing rod (20) is connected to the end of the second piston (19) away from the first piston (18), and the other end of the fixing rod (20) extends into the installation groove (12) and is provided with a clamping portion (39).

4. The edge profile laser detector with a turntable according to claim 3, characterized in that, The clamping portion (39) is arranged as an elastic plate, and a plurality of the clamping portions (39) are arranged in a split or integral structure; Wherein, when a plurality of the clamping portions (39) are arranged in an integral structure, a plurality of mutually connected universal joints (21) are installed between the opposite surfaces of the fixing rod (20) and the clamping portion (39).

5. The edge profile laser detector with a turntable according to claim 3, characterized in that, A ring-shaped or multi-toothed limiting platform is formed by inward extension along the periphery on one end of the activity chamber and close to the side of the installation groove (12), and a return spring (22) is installed between the second piston (19) and the limiting platform; The deformation amount of the return spring (22) is greater than the displacement amount between the clamping portion (39) and the surface of the workpiece; The injection pressure of the compressed air is lower than or equal to the deformation force of the return spring (22).

6. The edge profile laser detector with a turntable according to claim 1, characterized in that, The laser detection head (4) is configured with a three-coordinate displacement structure, and the three-coordinate displacement structure includes: A tangential movement module (23) is arranged on the working surface of the machine body (1); An axial movement module (24) is installed at the output end of the tangential movement module (23); A radial movement module (25) is installed at the output end of the axial movement module (24); The laser detection head (4) is installed at the output end of the radial movement module (25), and the scanning end of the laser detection head (4) is arranged towards the central axis of the detection fixture (2); The tangential movement module (23), the axial movement module (24) and the radial movement module (25) are all arranged as linear displacement structures and connected to the control unit (5).

7. The edge profile laser detector with a turntable according to claim 1, characterized in that, The driving part of the turntable (3) is arranged as a toothed ring (26), and the driving unit includes a driving motor (28) and a gear (27) arranged at the output end of the driving motor (28), and the gear (27) meshes with the toothed ring (26).

8. The edge profile laser detector with a turntable according to claim 1, characterized in that Both the positioning tooling and the clamping tooling are configured with a power supply module (29), and the cables (38) of the positioning tooling and the clamping tooling are respectively connected to the power supply module (29) and / or the control unit (5) via wire winding wheels (30); The turntable (3) is provided with a mounting hole along the central axis direction. The wire winding wheel (30) is inserted into the mounting hole and connected to the lining plate of the machine bed (1). A plurality of turns of wire routing grooves (31) are spirally arranged at one end of the wire winding wheel (30) close to the base (11) starting from its central axis. A wire arranging ring (32) is arranged on the outer peripheral side of the wire routing groove (31), and a wire passing port (33) communicating with the edge side of the wire routing groove (31) is arranged on the wire arranging ring (32). A wiring port (34) is arranged on the central side of the wire routing groove (31); A spring (35) is coiled and installed in the wire routing groove (31). A plurality of wire clamping clips (36) are arranged along the extending direction of the spring (35) for clamping and arranging the cable; One end of the spring (35) is installed on one side of the wiring port (34) of the wire routing groove (31). The other end of the spring (35) passes through the wire passing port (33) and is provided with a connecting portion (37). The connecting portion (37) is connected to the bottom of the base (11); When the connecting portion (37) rotates around the wire arranging ring (32) at the wire passing port (33) in the initial state, the spring (35) is gradually tightened and contracted, realizing the stretching of the cable (38).

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