CN113719700B - Test holder and calibration method thereof - Google Patents

Abstract

The invention provides a test holder and a calibration method thereof, wherein the test holder comprises a main base, an alternative positioning assembly and a pressing assembly; the replaceable positioning component is detachably assembled on the main base, a positioning space is formed on one side of the replaceable positioning component, and the shape and the size of the positioning space can be adjusted; the pressing assembly is assembled on the main base and can extend into the positioning space, and the pressing assembly is matched with the alternative positioning assembly to clamp a tested product. The test cloud platform can realize the loading of the depth camera of different sizes fixed and use convenient and fast, and the commonality is higher, can improve the rate of utilization of test cloud platform, practices thrift management and cost of manufacture. The calibration method enables the loading actual states of the laser calibration module and the tested product to be consistent through the positioning of the same reference surface, and the laser reflection concentricity is used as a judgment basis for judging whether the axial perpendicularity reaches the standard or not, so that the judgment and calibration of the axial perpendicularity can be conveniently and quickly realized, and the comprehensive precision of the test holder is higher.

Description

Test holder and calibration method thereof

Technical Field

The invention belongs to the technical field of product testing, and particularly relates to a testing holder and a calibration method thereof.

Background

A depth camera is a device that obtains target depth information by testing distance and is used for related applications. In the development and production processes of the depth camera, the depth camera needs to be loaded and fixed through a tool fixture (holder), and then the depth camera is calibrated and tested through a corresponding reference position and a distance between a relative plane target object (a test board). However, in the related art, the tool holder for loading and fixing the depth camera has a single compatibility, is generally manufactured in a dedicated form, and has low utilization rate and high management and manufacturing cost.

Disclosure of Invention

The invention aims to provide a test holder and a calibration method thereof, which can conveniently and quickly realize the loading, fixing and use of depth cameras with different sizes, can improve the utilization rate of the test holder, and save the management and manufacturing cost.

In order to solve the technical problem, the invention provides a test holder which comprises a main base, an alternative positioning assembly and a pressing assembly, wherein the main base is provided with a positioning hole; the replaceable positioning component is detachably assembled on the main base, a positioning space is formed on one side of the replaceable positioning component, and the shape and the size of the positioning space can be adjusted; the pressing assembly is assembled on the main base and can extend into the positioning space to be matched with the alternative positioning assembly to clamp a tested product.

In one embodiment, the alternative positioning assembly comprises an alternative reference bottom plate and a reference stopper, the alternative reference bottom plate is detachably assembled on the main base, the reference stopper is detachably assembled on one side of the alternative reference bottom plate, and the reference stopper and the alternative reference bottom plate jointly enclose the positioning space.

In one embodiment, the alternative base plate has a first mounting side protruding beyond the edge of the main base, the reference stopper includes a reference mounting plate fitted with the first mounting side and a latch fixedly fitted to a side of the reference mounting plate facing into the main base, and the latch and the reference mounting plate enclose to form a positioning groove.

In one embodiment, the alternative reference base plate has an extension portion provided to the first mounting side, a side of the extension portion away from the first mounting side being a second mounting side, and the reference stopper is capable of being fitted with the second mounting side through the reference mounting plate.

In one embodiment, the pressing assembly includes a guiding module, a pressing module and an adjusting module, the guiding module is assembled on the main base, the pressing module is assembled on the guiding module in a sliding manner, the adjusting module is assembled on the main base and connected to the pressing module, and the adjusting module is used for driving the pressing module to move along the guiding module towards or away from the positioning space.

In one embodiment, the compression module includes a compression mounting plate slidably mounted to the guide module, and the adjustment module is located on a side of the compression mounting plate facing away from the alternative positioning assembly, the adjustment module being coupled to the compression mounting plate.

In one embodiment, the pressing module further comprises an adjusting pressing block detachably assembled on the pressing mounting plate, and the adjusting pressing block is provided with a pressing protrusion extending to the positioning space.

In one embodiment, at least two guide modules are assembled on the main base, each guide module comprises a fixed block fixed on the main base and a guide rail fixed on the fixed block, the extension directions of the guide rails are parallel to each other, the compression mounting plate is slidably connected with the guide rails, and the plate surface of the compression mounting plate is perpendicular to the extension directions of the guide rails.

In one embodiment, the adjusting module comprises a mounting base, a push-pull rod, a shaft clamp and an adjusting rod, wherein the mounting base is assembled on the main base, the push-pull rod is assembled on the mounting base in a sliding mode, one end of the push-pull rod is connected to the pressing mounting plate, one end of the shaft clamp is rotatably connected to the other end of the push-pull rod, the adjusting rod is rotatably connected to the mounting base, and the other end of the shaft clamp is rotatably connected to the adjusting rod; when the adjusting rod rotates around the mounting base, the adjusting rod can drive the push-pull rod to move towards the direction close to or far away from the positioning space through the shaft clamp.

In one embodiment, the pressing mounting plate and the push-pull rod are slidably assembled, and the adjusting module further comprises an elastic member connected to the push-pull rod at one end and connected to the pressing mounting plate at the other end, wherein the elastic member is used for providing elastic force to the pressing mounting plate along the push-pull rod and towards the positioning space.

In one embodiment, the test platform further comprises a laser calibration module, the laser calibration module comprises a calibration base and a laser emitter, the laser emitter is fixed on the calibration base, and one side of the laser emitter is provided with a laser emitting hole and a laser reflecting area arranged outside the laser emitting hole in a surrounding manner; the calibration base is matched with the positioning space, and the calibration base can be clamped by the alternative positioning assembly and the pressing assembly in a matching mode.

Further, a calibration method of the test holder is provided, which includes:

the laser calibration module emits laser to a reflecting surface of a reflecting piece, the laser calibration module is assembled on a test holder, the reflecting piece is arranged on a measured surface, and the reflecting surface of the reflecting piece is parallel to the measured surface;

moving the test holder to a test position, and acquiring a deviation range of a reflection light spot between the position of a laser reflection area and the position of a laser emission point when the test holder is at the current test position;

judging whether the deviation range is smaller than or equal to a preset range or not; if not, adjusting the pose of the test holder according to the deviation range to enable the deviation range to be smaller than or equal to a preset range.

In one embodiment, before the laser calibration module emits laser light to the reflection surface of the reflection member, the laser calibration module needs to be self-calibrated, including:

a laser emitter in the rotary laser calibration module emits laser to the reflecting piece;

acquiring a light spot formed by a laser reflection area outside the laser emission hole and a rotating diameter range thereof through a reflection piece; judging whether the rotating diameter is smaller than or equal to a preset diameter threshold value or not; if not, adjusting the pose of the laser emitter, and continuing to rotate the laser emitter until the rotation diameter of the light spot is within a preset diameter threshold.

In one embodiment, moving the test platform to a test position, and obtaining a deviation range between a position of a reflection light spot in a laser reflection area and a position of a laser emission point when the test platform is at the current test position includes:

moving the test holder to a first test position, and acquiring a first deviation range between the position of a reflection light spot in a laser reflection area and the position of a laser emission point when the test holder is at the current test position;

and moving the test holder to a second test position, and acquiring a second deviation range of the position of the reflection light spot of the test holder at the current test position between the position of the laser reflection area and the position of the laser emission point, wherein the distance between the first test position and the reflection surface is different from the distance between the second test position and the reflection surface.

Compared with the prior art, the test holder and the calibration method thereof have the advantages that:

the alternative positioning assembly can be selected according to the type of the depth camera to be loaded, then is assembled on the main base, and the alternative positioning assembly can be adjusted after the assembly is completed, so that the shape and the size of a positioning space formed by the alternative positioning assembly can be adjusted, then the depth camera is placed into the positioning space, the compression assembly abuts against one side of the depth camera, and a tested product is clamped under the matching of the compression assembly and the alternative positioning assembly. The scheme can conveniently and quickly realize the fixing and the use of the depth cameras with different sizes, has higher universality, can improve the utilization rate of the test holder, and saves the management and the manufacturing cost.

Drawings

Fig. 1 is a schematic overall structure diagram of a test holder according to an embodiment of the invention;

FIG. 2 is a schematic diagram of a test platform with a single product (depth camera) in an embodiment of the present invention;

FIG. 3 is a schematic diagram of a test platform loading 3-in-1 products (including a depth camera with a specially-shaped bottom) according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of the overall structure of a test platform with a laser calibration module according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of the operation of a test element in cooperation with a laser calibration module in one embodiment of the present invention;

FIG. 6 is a schematic diagram of the overall structure of a test element in one embodiment of the invention;

FIG. 7 is a side view of a test element in one embodiment of the invention;

fig. 8 is a schematic flow chart of a calibration method of a test head according to an embodiment of the present invention.

In the drawings, each reference numeral denotes: 1. a main base; 2. an alternative positioning assembly; 21. an alternative datum baseplate; 22. a reference stopper; 211. a first mounting side; 212. an extension portion; 2121. a second mounting side; 221. a reference mounting plate; 222. a clamping block; 3. a compression assembly; 31. a guide module; 32. a compression module; 33. an adjustment module; 311. a fixed block; 312. a guide rail; 321. compressing the mounting plate; 322. adjusting a pressing block; 3221. compressing the bulge; 331. installing a base; 332. a push-pull rod; 333. a shaft clamp; 334. adjusting a rod; 4. a laser calibration module; 41. calibrating the base; 42. a laser transmitter; 43. a reference support arm; 411. a receiving groove; 421. a laser emitting hole; 422. a laser reflection region; 423. the screw is tightly pressed in the X direction; 424. the screw is tightly pressed in the Y direction; 425. a focusing structure; 5. testing the lens; 6. a test element; 61. a test board; 62. a mirror; 63. a back plate; 611. an abutment surface.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below 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 are not intended to limit the invention.

The embodiment is as follows:

in the present embodiment, with reference to fig. 1-3, a testing platform is provided, which includes a main base 1, an alternative positioning assembly 2, and a pressing assembly 3; the alternative positioning component 2 is detachably assembled on the main base 1, one side of the alternative positioning component 2 forms a positioning space, and the shape and the size of the positioning space can be adjusted; the pressing component 3 is assembled on the main base 1, and the pressing component 3 can extend into the positioning space and is used for being matched with the alternative positioning component 2 to clamp a tested product.

The alternative positioning component 2 can be selected according to the type of the depth camera to be loaded, then is assembled on the main base 1, and the alternative positioning component 2 can be adjusted after the assembly is completed, so that the shape and the size of a positioning space formed by the alternative positioning component 2 can be adjusted, then the depth camera is placed in the positioning space, the compression component 3 abuts against one side of the depth camera, and the tested product is clamped under the matching of the compression component 3 and the alternative positioning component 2. The scheme can conveniently and quickly realize the fixing and the use of the depth cameras with different sizes, has higher universality, can improve the utilization rate of the test holder, and saves the management and the manufacturing cost.

In one embodiment, the alternative positioning assembly 2 includes an alternative reference bottom plate 21 and a reference stopper 22, the alternative reference bottom plate 21 is detachably mounted to the main base 1, the reference stopper 22 is detachably mounted to one side of the alternative reference bottom plate 21, and the reference stopper 22 and the alternative reference bottom plate 21 together enclose a positioning space. In some implementation manners, the main base 1 is flat, the main base 1 is provided with an assembling hole, the main base 1 can be fixed with the position adjusting platform through the assembling hole, the position adjusting platform can be an electric sliding table, a rotating table and the like, and any moving mechanism capable of adjusting the position and/or the angle can be adopted without limitation. In some embodiments, a reference slot is provided on one side of the main base 1, the alternative reference bottom plate 21 is inserted into the reference slot and fixed to the main base 1 by screws or bolts, so as to ensure the assembly accuracy and the assembly stability of the alternative reference bottom plate 21, the shape and the size of the alternative reference bottom plate 21 can be designed and adjusted according to actual conditions, the alternative reference bottom plate 21 and the main base 1 can be detachably assembled, that is, one main base 1 can be adapted to multiple alternative reference bottom plates 21, and the utilization rate of the main base 1 is higher.

In one embodiment, the alternative reference bottom plate 21 has a first mounting side 211 protruding out of the edge of the main base 1, the reference stopper 22 includes a reference mounting plate 221 fitted with the first mounting side 211 and a latch 222 fixedly fitted to a side of the reference mounting plate 221 facing into the main base 1, and the latch 222 and the reference mounting plate 221 enclose to form a positioning groove. Since the first mounting side 211 protrudes out of the edge of the main base 1, the reference stopper 22 is assembled to the first mounting side 211 without interference with the main base 1, which is more convenient and faster. In some implementations, the two reference stoppers 22 are symmetrically disposed, two positioning holes may be respectively opened on the sides close to each other of the two fixture blocks 222, the positioning holes may be part of the positioning grooves, the shapes and sizes of the positioning holes may be set according to the structure and size adaptability of the depth camera to be assembled, a positioning space may be formed by enclosing the two fixture blocks 222, the two reference mounting plates 221, and the alternative reference bottom plate 21 together, the positioning space may be used for positioning the depth camera, the assembling accuracy of the depth camera is ensured, and the depth camera may be more firmly and stably loaded by the pressing action of the pressing assembly 3.

In one embodiment, the alternative reference base plate 21 has an extension 212 disposed on the first mounting side 211, the side of the extension 212 remote from the first mounting side 211 is a second mounting side 2121, and the reference stop 22 is capable of being assembled with the second mounting side 2121 via the reference mounting plate 221. In some implementations, two outer extensions 212 may be symmetrically disposed on the alternative base reference plate 21, and the two outer extensions 212 are located at two ends of the first mounting side 211, so that the two outer extensions 212 and the first mounting side 211 enclose an opening, and the reference stopper 22 is located in the opening when mounted on the first mounting side 211, and at this time, a positioning space formed by the reference stopper 22 and the alternative base reference plate 21 may be used to position a depth camera with a smaller size, and when the reference stopper 22 is mounted on the second mounting side 2121, a positioning space formed by the reference stopper 22 and the alternative base reference plate 21 is larger in size, so that a depth camera with a larger size may be positioned, and the model of the test cloud platform adapted to the depth camera may be further expanded through the arrangement of the outer extensions 212. It should be understood that the extension length, shape and number of the extension portion 212 may be set according to actual conditions, and the positioning groove of the reference stopper 22 may also be set according to actual conditions, so as to adapt to more size depth cameras and to adapt to a profile depth camera; for example, the extensions 212 may be arranged symmetrically, but the outward extensions of the extensions 212 are different; as another example, the top-view shape of the extension 212 may be rectangular, trapezoidal, parallelogram, or the like; for another example, two, three, four, etc. groups of the outer extensions 212 may be provided, and each group is provided with two outer extensions 212, and the extension lengths of the outer extensions 212 of the groups are different, so as to adapt to depth cameras of more specifications.

In one embodiment, the first mounting side 211 and the second mounting side 2121 are each provided with first positioning holes at intervals, the reference mounting plate 221 is provided with first mounting holes, and the reference mounting plate 221 is fixed to the first mounting side 211 or the second mounting side 2121 by means of screws passing through the first mounting holes and then being connected to the first positioning holes. The first positioning holes may be disposed along the extending direction of the first mounting side 211 or the extending direction of the second mounting side 2121, and the distances between adjacent first positioning holes may be the same or different, and the specific distance may be set according to the model of the depth camera to which the alternative positioning assembly 2 is to be adapted, and the corresponding first positioning hole fixing reference mounting plate 221 may be selected to adjust the position relationship between the reference mounting plate 221 and the alternative reference base plate 21, so as to adjust the size and shape of the positioning space to adapt to the depth camera that needs to be fixed. In some implementations, the first mounting hole formed on the reference mounting plate 221 may be a kidney-shaped hole, which may allow for more flexible adjustment of the position between the reference block 22 and the alternative reference base plate 21.

In some embodiments, the pressing assembly 3 includes a guiding module 31, a pressing module 32, and an adjusting module 33, wherein the guiding module 31 is mounted on the main base 1, the pressing module 32 is slidably mounted on the guiding module 31, the adjusting module 33 is mounted on the main base 1 and connected to the pressing module 32, and the adjusting module 33 is configured to move the pressing module 32 along the guiding module 31 toward or away from the positioning space.

In one embodiment, the pressing module 32 includes a pressing mounting plate 321 slidably mounted to the guide module 31, the adjusting module 33 is located on a side of the pressing mounting plate 321 facing away from the alternative positioning assembly 2, and the adjusting module 33 is connected to the pressing mounting plate 321. Specifically, the length direction of the pressing mounting plate 321 is parallel to the first mounting side 211, the plate surface of the pressing mounting plate 321 is perpendicular to the plate surface of the main base 1, and the sliding assembly direction of the pressing mounting plate 321 is perpendicular to the plate surface.

In one embodiment, the pressing module 32 further comprises an adjusting pressing block 322 detachably assembled to the pressing mounting plate 321, and the adjusting pressing block 322 has a pressing protrusion 3221 extending to the positioning space. In some implementations, the pressing mounting plate 321 is provided with second positioning holes arranged at intervals along the length direction, the adjusting press block 322 is provided with a second mounting hole, and the adjusting press block 322 and the pressing mounting plate 321 are fixed in a manner that screws penetrate through the second mounting holes and then are connected to the second positioning holes; specifically, taking a view angle of a drawing as an example, the second positioning hole is opened at the top side of the pressing mounting plate 321, the second positioning hole is arranged at intervals along the length direction of the pressing mounting plate 321, the second mounting hole is a waist-shaped hole, the position relationship between the adjusting pressing block 322 and the pressing mounting plate 321 is changed by selecting the position of the second positioning hole fixed by the adjusting pressing block 322, so as to adjust the position of the adjusting pressing block 322 pressing the depth camera, and the adjusting module 33 can drive the pressing mounting plate 321 to move towards the direction close to or away from the positioning space, thereby driving the adjusting pressing block 322 to press or loosen the depth camera. In some implementations, at least two adjusting pressing blocks 322 may be provided, and preferably, the adjusting pressing blocks 322 are provided two and are arranged axisymmetrically with the center line of the pressing mounting plate 321, so that the pressing force is more uniform, and in addition, if the size of the depth camera is larger, three, four, and the like may be provided for the adjusting pressing blocks 322, and each adjusting pressing block 322 may be provided symmetrically or asymmetrically.

In one embodiment, at least two guide modules 31 are assembled on the main base 1, each guide module 31 includes a fixing block 311 fixed to the main base 1 and a guide rail 312 fixed to the fixing block 311, the extending directions of the guide rails 312 are parallel to each other, a pressing mounting plate 321 is slidably connected to each guide rail 312, and the plate surface of the pressing mounting plate 321 is perpendicular to the extending direction of the guide rails 312. In some implementations, two guide modules 31 are symmetrically disposed outside the two end positions of the first mounting side 211, the fixing blocks 311 are fixed in the reference card slots and located between the alternative reference bottom plate 21 and the main base 1, each fixing block 311 is fixed with a guide rail 312, and the pressing mounting plate 321 is slidably assembled on the two guide rails 312, so that the sliding is more stable. In some implementations, the guide rails 312 are suspended on the main base 1, the pressing and mounting plate 321 may be provided with sliding holes, the guide rails 312 are cylindrical, the sliding holes are cylindrical holes, the sliding holes are slidably connected with the corresponding guide rails 312, and sliding sleeves may be disposed between the sliding holes and the guide rails 312. In some implementations, the guide rail 312 may also be fixed to the main base 1, and the bottom side of the pressing and mounting plate 321 may be provided with a sliding groove, which may be a dovetail groove, a trapezoidal groove, or the like, and the sliding groove is matched with the guide rail 312 and slidably connected with the guide rail 312.

In one embodiment, the adjusting module 33 includes a mounting base 331, a push-pull rod 332, a shaft clamp 333 and an adjusting rod 334, the mounting base 331 is assembled on the main base 1, the push-pull rod 332 is slidably assembled on the mounting base 331, one end of the push-pull rod 332 is connected to the pressing mounting plate 321, one end of the shaft clamp 333 is rotatably connected to the other end of the push-pull rod 332, the adjusting rod 334 is rotatably connected to the mounting base 331, and the other end of the shaft clamp 333 is rotatably connected to the adjusting rod 334; when the adjusting rod 334 rotates around the mounting base 331, the adjusting rod 334 can drive the push-pull rod 332 to move toward or away from the positioning space through the shaft clamp 333. The push-pull rod 332 can be driven to slide relative to the mounting base 331 by pulling the adjusting rod 334, so as to drive the compressing module 32 to perform compressing action, which is convenient and fast. In some implementations, the main base 1 is provided with third positioning holes at intervals along the sliding direction of the push-pull rod 332, the mounting base 331 is provided with third mounting holes, the mounting base 331 and the main base 1 are fixed by bolts passing through the third mounting holes and the third positioning holes, the intervals of adjacent third positioning holes may be the same or different, and the intervals of adjacent third positioning holes may be set according to actual conditions, and the initial position of the adjusting module 33 may be adjusted by selecting the corresponding third positioning hole to fix the mounting base 331, so as to compress depth cameras of corresponding models.

In one embodiment, the pressing mounting plate 321 and the push-pull rod 332 are slidably assembled, and the adjusting module 33 further includes an elastic member connected to the push-pull rod 332 at one end and connected to the pressing mounting plate 321 at the other end, and the elastic member is used for providing elastic force to the pressing mounting plate 321 along the push-pull rod 332 and towards the positioning space. Specifically, a through hole is formed in the middle of the compression mounting plate 321, the push-pull rod 332 is slidably connected in the through hole, a butt block is arranged at the end of the push-pull rod 332, and the butt block is located on the side, close to the positioning space, of the compression mounting plate 321, so that the push-pull rod 332 can drive the compression mounting plate 321 to perform loosening action when moving in the direction away from the positioning space, the elastic piece is a spring and is sleeved outside the push-pull rod 332, one end of the elastic piece abuts against the push-pull rod 332, and the other end of the elastic piece abuts against the side, away from the positioning space, of the compression mounting plate 321, therefore, when the push-pull rod 332 drives the compression mounting plate 321 to perform compression action, the elastic piece can provide buffer pressure, and can further approach the compression mounting plate 321 to a test product, so as to better fix the test product.

The calibration and test precision of the depth camera have higher requirements on the contents such as absolute distance between a tool clamp (holder) and a target object, axial perpendicularity (namely, vertical and horizontal dip angles) and the like. At present, the axial perpendicularity is mainly measured by a laser distance meter up and down or left and right of a plane target object, and the difference value of each distance is used as a judgment basis. Namely, when the measured values are consistent with the measured values of the upper and lower parts or the measured values of the left and right parts, the axial verticality of the steel pipe is considered to reach the standard. However, the difference value (distance difference value) of the laser distance measuring instrument is used as the basis for determining the axial perpendicularity (i.e. the vertical and horizontal inclination angles) of the tool fixture, and due to the influence of human factors, the type precision difference (including the precision at different distances) of the laser distance measuring instrument and the like in the operation process, the comprehensive precision is low.

In order to improve the testing accuracy of the axial perpendicularity of the testing holder, on the basis of the above various testing holders, in an embodiment, further, with reference to fig. 4, the testing holder further includes a laser calibration module 4, the laser calibration module 4 includes a calibration base 41 and a laser emitter 42, the laser emitter 42 is fixed to the calibration base 41, and one side of the laser emitter 42 has a laser emitting hole 421 and a laser reflection area 422 surrounding and disposed outside the laser emitting hole 421; the calibration base 41 is matched with the positioning space, and the calibration base 41 can be clamped by matching the alternative positioning assembly 2 and the pressing assembly 3. The calibration base 41 is clamped through the cooperation of the alternative positioning component 2 and the pressing component 3, so that the actual loading states of the laser calibration module 4 and a tested product are consistent, when the axial perpendicularity of the test holder is tested, the test lens 5 can be firstly attached to the measuring surface, then the laser emitter 42 is turned on, the laser emitted by the laser emitter 42 irradiates the test lens 5 and is reflected back, if the reflected light beam returns to the position of the laser emitter 42 for emitting laser, the axial perpendicularity of the test holder meets the requirement, if the reflected light beam is reflected to the laser reflection area 422, namely the reflected light beam does not return along the original path, the axial perpendicularity of the test holder is indicated to be deviated, and the calibration of the test holder can be carried out by adjusting the position and the attitude of the test holder until the reflected light beam returns to or is closer to the position of the laser emitter 42 for emitting laser.

A calibration structure is arranged on the side surface of the laser emitter 42, and the calibration structure is used for adjusting the light path direction of the laser emitted by the laser emitter 42; one side of the laser emitter 42 is provided with a focusing structure 425, and the focusing structure 425 is used for adjusting the focusing degree of the laser emitted by the laser emitter 42. Specifically, the laser emitter 42 and the calibration base 41 may be connected by a universal bearing, the calibration structure may include an X-direction tightening screw 423 disposed on one side of the laser emitter 42 and a Y-direction tightening screw 424 disposed on the other side of the laser emitter 42, the change of the optical path of the laser emitter 42 may be achieved jointly by the cooperation of the X-direction tightening screw 423 and the Y-direction tightening screw 424, and the focusing structure 425 may be disposed on the top side of the laser emitter 42.

In one embodiment, the laser calibration module 4 further comprises a reference arm 43 connected to the calibration base 41, the reference arm 43 matching the positioning space. Specifically, a plurality of calibration positioning holes can be formed in the calibration base 41, one end of the reference support arm 43 can be fixed to the calibration base 41 through the calibration positioning holes, the angle relationship between the reference support arm 43 and the calibration base 41 can be adjusted by selecting the corresponding calibration positioning holes, the calibration support arm with the appropriate specification and the corresponding calibration positioning holes are selected, the calibration support arm can be matched with the positioning space, and therefore the state of the laser calibration module 4 is consistent with the actual state of the loaded product to be tested. It will be appreciated that the number, shape and size of the alignment arms may be arranged to suit the attachment of alternative positioning assemblies 2 in different combinations.

In one embodiment, the testing platform further includes a testing lens 5, one side of the calibration base 41 is provided with a receiving slot 411, and the testing lens 5 can be embedded in the receiving slot 411. Specifically, the test lens 5 is a circular lens having a diameter of 70 mm.

In one embodiment, referring to fig. 5-7, the testing device 6 includes a testing board 61 and a mirror 62 mounted on the testing board 61, the testing board 61 has a supporting surface 611 on one side, the supporting surface 611 is used for supporting a surface to be measured, a reflecting surface of the mirror 62 faces to a direction of the testing board 61 departing from the supporting surface 611, and the reflecting surface of the mirror 62 is parallel to the supporting surface 611. In some implementations, the testing element 6 may further include a back plate 63 and a supporting rod, the back plate 63 is fixed to the side of the testing board 61 away from the abutting surface 611, the board surface of the back plate 63 is perpendicular to the board surface of the testing board 61, the reflective mirror 62 is fixed to the middle portion of the back plate 63, a cross section (a cross section perpendicular to the length direction of the testing board 61) of a structure formed by the testing board 61 and the back plate 63 together is T-shaped, a supporting rod mounting hole may be formed in the testing board 61, the supporting rod may be fixed to the testing board 61 through the supporting rod mounting hole, the supporting rod may be used to support the testing board 61, the abutting surface 611 may abut against the measured surface, so that the reflecting surface of the reflective mirror 62 is parallel to the measured surface, the laser emitted by the laser calibration module 4 may irradiate the reflective mirror 62 for reflection, thereby calibrating the axial perpendicularity of the testing platform, i.e., calibrating the parallelism between the testing platform and the measured surface; also, this structure enables testing of a larger area of the surface to be measured than the structure of the test lens 5.

Based on the foregoing various solutions for testing the pan/tilt head, in order to improve the measurement accuracy of the axial perpendicularity of the testing pan/tilt head and improve the comprehensive accuracy of the testing pan/tilt head, further, in an embodiment, with reference to fig. 8, there is provided a calibration method for a testing pan/tilt head, including:

s1, a laser calibration module 4 emits laser to a reflection surface of a reflection piece (which can be a test lens 5 or a test element 6), the laser calibration module 4 is assembled on a test holder, the reflection piece is arranged on a measured surface, and the reflection surface of the reflection piece is parallel to the measured surface;

s2, moving the testing holder to a testing position, and acquiring a deviation range of a reflection light spot between the position of the laser reflection area 422 and the position of a laser emission point when the testing holder is at the current testing position;

s3, judging whether the deviation range is smaller than or equal to a preset range; if not, adjusting the pose of the test holder according to the deviation range to enable the deviation range to be smaller than or equal to the preset range.

The laser calibration module 4 emits laser to the reflection surface of the reflection member, and then forms a reflection beam, the reflection beam can irradiate the laser reflection area 422 to form a reflection light spot, whether the parallel between the current testing holder and the measured surface reaches the standard can be judged by judging whether the deviation range is smaller than or equal to the preset range, if the deviation range is smaller than or equal to the preset range, the parallel reaches the standard is judged, if the deviation range is larger than the preset range, the parallel does not reach the standard, and the parallelism between the testing holder and the measured surface reaches the standard by adjusting the pose of the testing holder. The laser calibration module 4 and the actual state loaded by the tested product are consistent through the positioning of the same reference surface, and the judgment and calibration of the axial perpendicularity can be conveniently and quickly realized according to the judgment basis of whether the laser reflection concentric degree is up to the standard as the parallelism, so that the comprehensive precision of the test holder is higher. It should be noted that the laser reflection concentricity is an included angle between a light beam reflected by the laser and a light beam emitted by the laser through the laser emission hole 421; laser emitting aperture 421 may also be referred to as a concentric aperture.

In one embodiment, before the laser calibration module 4 emits laser light to the reflection surface of the reflector, the laser calibration module 4 needs to be subjected to a self-calibration, that is, to calibrate the assembly verticality of the laser emitter 42 after the assembly on the calibration base 41, and the self-calibration step may include:

the laser emitter 42 in the rotary laser calibration module 4 emits laser to the reflector; in particular, the distance between the laser emitter 42 and the reflector may be 1-2 meters;

acquiring a light spot formed by a laser reflection area 422 outside the laser emission hole 421 and a rotating diameter range thereof through a reflector;

judging whether the rotating diameter is smaller than or equal to a preset diameter threshold value or not; if not, adjusting the pose of the laser emitter 42, and continuing to rotate the laser emitter 42 until the rotation diameter of the light spot is within the preset diameter threshold range. Specifically, when the rotating diameter is larger than the predetermined diameter threshold, the X-direction tightening screw 423 and/or the Y-direction tightening screw 424 should be adjusted to change the laser light path of the laser emitter 42, the laser emitter 42 is rotated again after adjustment, then the size relationship between the rotating diameter and the predetermined diameter threshold is determined, and the above operations are repeated in sequence until the diameter of the current laser direct or reflected light spot is smaller than or equal to the predetermined diameter threshold, and at this time, the diameter of the light spot tends to be concentric holes.

By carrying out self-calibration on the laser calibration module 4, the measurement and calibration of the axial perpendicularity of the test holder can be ensured to be more accurate.

In an embodiment, the step S1 to step S2 of obtaining a deviation range between the position of the reflection light spot in the laser reflection area 422 and the position of the laser emission point when the test platform is at the current test position may include:

acquiring the deviation distance between the position of the reflection light spot in the laser reflection area 422 and the position of the laser emission point; the directional relationship (i.e., relative tilt angle) between the position of the reflected light spot in the laser reflection area 422 and the position of the laser emission point is obtained.

In one embodiment, moving the testing stage to the testing position to obtain the deviation range between the position of the reflection light spot in the laser reflection area 422 and the position of the laser emission point when the testing stage is at the current testing position may include:

moving the test holder to a first test position, and acquiring a first deviation range between the position of a reflection light spot in the laser reflection area 422 and the position of a laser emission point when the test holder is at the current test position;

and moving the test holder to a second test position, and acquiring a second deviation range between the position of the reflection light spot in the laser reflection area 422 and the position of the laser emission point when the test holder is at the current test position, wherein the distance between the first test position and the reflection surface is different from the distance between the second test position and the reflection surface.

In particular, the first test position may be a proximal end (i.e., a position near the reflective surface) and the second test position may be a distal end (i.e., a position away from the reflective surface). Wherein the first deviation range and the second deviation range may each include the deviation distance and direction relationship as described above. It should be understood that step S3 may be performed after the first deviation range is acquired, after the second deviation range is acquired, or after both the first and second deviation ranges are acquired. The test holder is calibrated at least two test positions respectively, and the calibration effect is better.

Adjusting the pose of the test holder according to the deviation range can include:

and adjusting the position and the angle of the test platform according to the deviation distance and the direction relation. In some implementations, determining whether the deviation range is less than or equal to the preset range can include: and judging whether the deviation distance is smaller than or equal to a preset distance threshold value. It can be understood that the preset distance threshold can be set according to the actually required precision, the smaller the distance between the position of the reflection light spot in the laser reflection area 422 and the position of the laser emission point is, the higher the standard degree of the axial perpendicularity of the test holder is, and under the condition of the highest standard degree, the position of the reflection light spot in the laser reflection area 422 coincides with the position of the laser emission point.

In one embodiment, after the pose of the test platform is adjusted according to the deviation range, so that the deviation range is smaller than or equal to the preset range, the size of the diameter of the laser emitted by the laser calibration module 4 can be further focused through the focusing structure 425, so as to better judge the position of the reflected light spot deviating from the same core (i.e. the laser emitting hole). The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (12)

1. A test holder is characterized by comprising a main base, an alternative positioning assembly and a pressing assembly; the replaceable positioning component is detachably assembled on the main base, a positioning space is formed on one side of the replaceable positioning component, and the shape and the size of the positioning space can be adjusted; the pressing assembly is assembled on the main base and can extend into the positioning space to be matched with the alternative positioning assembly to clamp a tested product;

the alternative positioning assembly comprises an alternative reference bottom plate and a reference stop block, the alternative reference bottom plate is detachably assembled on the main base, the reference stop block is detachably assembled on one side of the alternative reference bottom plate, and the reference stop block and the alternative reference bottom plate jointly enclose to form the positioning space;

the alternative datum bottom plate is provided with a first installation side protruding out of the edge of the main base, the datum stop block comprises a datum installation plate assembled with the first installation side and a clamping block fixedly assembled on one side of the datum installation plate facing into the main base, and the clamping block and the datum installation plate are enclosed to form a positioning groove.

2. A test head according to claim 1, wherein the alternative base plate has an outer extension provided on the first mounting side, the side of the outer extension remote from the first mounting side being a second mounting side, the reference stop being fittable with the second mounting side via the reference mounting plate.

3. The test platform of claim 1, wherein the compression assembly comprises a guide module, a compression module and an adjustment module, the guide module is assembled to the main base, the compression module is slidably assembled to the guide module, the adjustment module is assembled to the main base and connected to the compression module, and the adjustment module is configured to move the compression module along the guide module in a direction approaching or departing from the positioning space.

4. A test head according to claim 3, wherein the compression module comprises a compression mounting plate slidably mounted to the guide module, the adjustment module being located on a side of the compression mounting plate remote from the alternative positioning assembly, the adjustment module being connected to the compression mounting plate.

5. A test head according to claim 4, wherein the compression module further comprises an adjustment block removably mounted to the compression mounting plate, the adjustment block having a compression projection extending towards the location space.

6. The test platform of claim 4, wherein the main base is provided with at least two guide modules, each guide module comprises a fixing block fixed on the main base and a guide rail fixed on the fixing block, the extension directions of the guide rails are parallel to each other, the compression mounting plate is slidably connected to each guide rail, and the plate surface of the compression mounting plate is perpendicular to the extension directions of the guide rails.

7. The test platform of claim 4, wherein the adjustment module comprises a mounting base, a push-pull rod, a shaft clamp and an adjustment rod, wherein the mounting base is assembled to the main base, the push-pull rod is slidably assembled to the mounting base, one end of the push-pull rod is connected to the compression mounting plate, one end of the shaft clamp is rotatably connected to the other end of the push-pull rod, the adjustment rod is rotatably connected to the mounting base, and the other end of the shaft clamp is rotatably connected to the adjustment rod; when the adjusting rod rotates around the mounting base, the adjusting rod can drive the push-pull rod to move towards the direction close to or far away from the positioning space through the shaft clamp.

8. The test head according to claim 7, wherein the pinch mounting plate and the push-pull rod are slidably mounted, and the adjustment module further comprises an elastic member having one end connected to the push-pull rod and the other end connected to the pinch mounting plate, the elastic member being configured to provide an elastic force to the pinch mounting plate along the push-pull rod and toward the positioning space.

9. The test holder according to any one of claims 1 to 8, further comprising a laser calibration module, wherein the laser calibration module comprises a calibration base and a laser emitter, the laser emitter is fixed to the calibration base, and one side of the laser emitter is provided with a laser emitting hole and a laser reflecting area arranged around the laser emitting hole; the calibration base is matched with the positioning space, and the calibration base can be clamped by the alternative positioning assembly and the pressing assembly in a matching manner.

10. A calibration method of a test holder is used for testing the holder, and the test holder comprises a main base, an alternative positioning assembly, a pressing assembly and a laser calibration module; the replaceable positioning component is detachably assembled on the main base, a positioning space is formed on one side of the replaceable positioning component, and the shape and the size of the positioning space can be adjusted; the pressing assembly is assembled on the main base and can extend into the positioning space to be matched with the alternative positioning assembly to clamp a tested product; the laser calibration module comprises a calibration base and a laser emitter, the laser emitter is fixed on the calibration base, and one side of the laser emitter is provided with a laser emitting hole and a laser reflecting area arranged outside the laser emitting hole in a surrounding mode; the calibration base is matched with the positioning space, and the calibration base can be clamped by the alternative positioning assembly and the pressing assembly in a matching manner; characterized in that the calibration method comprises:

the laser calibration module emits laser to a reflecting surface of a reflecting piece, the laser calibration module is assembled on a test holder, the reflecting piece is arranged on a measured surface, and the reflecting surface of the reflecting piece is parallel to the measured surface;

moving the test holder to a test position, and acquiring a deviation range of a reflection light spot between the position of a laser reflection area and the position of a laser emission point when the test holder is at the current test position;

judging whether the deviation range is smaller than or equal to a preset range or not; if not, adjusting the pose of the test holder according to the deviation range to enable the deviation range to be smaller than or equal to a preset range.

11. The calibration method for a test platform according to claim 10, wherein before said laser calibration module emits laser light to the reflective surface of the reflector, said laser calibration module needs to be self-calibrated, comprising:

a laser emitter in the rotary laser calibration module emits laser to the reflecting piece;

acquiring a light spot formed by a laser reflection area outside the laser emission hole and a rotating diameter range thereof through a reflection piece; judging whether the rotating diameter is smaller than or equal to a preset diameter threshold value; if not, adjusting the pose of the laser emitter, and continuing to rotate the laser emitter until the rotation diameter of the light spot is within a preset diameter threshold.

12. The calibration method for a test platform according to claim 10 or 11, wherein the moving the test platform to the test position to obtain the deviation range of the reflection light spot between the position of the laser reflection area and the position of the laser emission point when the test platform is at the current test position comprises:

moving the test holder to a first test position, and acquiring a first deviation range between the position of a reflection light spot in a laser reflection area and the position of a laser emission point when the test holder is at the current test position;

and moving the test holder to a second test position, and acquiring a second deviation range of the position of the reflection light spot of the test holder at the current test position between the position of the laser reflection area and the position of the laser emission point, wherein the distance between the first test position and the reflection surface is different from the distance between the second test position and the reflection surface.

Images