Precision mold surface machining accuracy detection device and method based on machine vision

Abstract

The present invention relates to the technical field of mold processing accuracy detection, and discloses a precision mold surface processing accuracy detection device and method based on machine vision, the detection device includes a base, a support rod is fixedly installed on the upper surface of the base, a top frame is fixedly installed on the top of the support rod, and a deflection component that can adjust the lighting direction to enhance the camera shooting accuracy is arranged on the outside of the camera. By providing a deflection component, the transmission ring is rotated in cooperation with the driving of the pinion and the gear ring, and the connecting rod is used to pull the swing seat to cause the swing seat to rotate with the rotating rod as the rotation axis, thereby changing the bottom end direction of the swing seat, thereby providing illumination for different positions within the camera shooting range, and at the same time, in cooperation with the elastic force limitation of the spiral spring when the rotating rod rotates, the swing seat maintains a relatively stable lighting state, thereby ensuring the camera shooting effect, and then improving the overall measurement accuracy of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of mold processing accuracy detection, and in particular to a device and method for detecting the surface processing accuracy of a precision mold based on machine vision. Background Art

[0002] The quality inspection of molds is mainly reflected in geometric accuracy, that is, mold contour geometry and position accuracy. By inspecting the geometric parameters of stamping molds, the error sources in the production process are analyzed so that the production process can be adjusted in time to effectively ensure the quality of the products produced. Geometric accuracy inspection is particularly important on automatic mold production lines.

[0003] The existing precision mold surface machining accuracy detection method adopts a non-contact detection method, which extracts the image contour information of the mold through a camera, uses the geometric contour information for positioning and matching, and determines whether the product is qualified based on the matching results. The main advantage is that the measurement speed is fast and no human intervention is required.

[0004] However, in actual use of the above detection method, due to the different sizes of workpieces to be inspected, some larger precision workpieces require adjustment of the position of the camera equipment to avoid the wide-angle setting of the camera being unable to clearly capture the edges or sides of the precision workpiece, thereby affecting the accuracy of image acquisition and resulting in inaccurate measurement data of the precision mold surface processing accuracy. When larger shooting equipment is set up, the top coverage area is larger, which makes it easy for the equipment to block the light on the workpiece surface, and the auxiliary light source has a poor fill-in effect on the shooting target position, which can easily lead to inaccurate shooting results of workpiece surface defects due to lighting reasons. In view of this, we propose a precision mold surface processing accuracy detection device and method based on machine vision. Summary of the invention

[0005] The purpose of the present invention is to provide a device and method for detecting the surface machining accuracy of a precision mold based on machine vision, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A precision mold surface processing accuracy detection device based on machine vision includes a base, a support rod is fixedly installed on the upper surface of the base, a top frame is fixedly installed on the top of the support rod, a shooting component is arranged inside the top frame and can adjust the shooting position of the precision detection of the workpiece to be detected on the base, the shooting component includes a transmission frame slidably installed on the inner wall of the top frame, a U-shaped frame is slidably installed on the side wall of the transmission frame, a camera is fixedly installed on the bottom of the U-shaped frame, and a deflection component with adjustable lighting direction is arranged on the outside of the camera to enhance the shooting accuracy of the camera.

[0008] Preferably, the shooting assembly includes motor 1, motor 1 is fixedly mounted on the side wall of the top frame, adjusting screw 1 is fixedly mounted on the output end of motor 1, a threaded sleeve is fixedly mounted on the top of the transmission frame, the threaded sleeve is threadedly connected to adjusting screw 1, motor 2 is fixedly mounted on the outer wall of the end of the transmission frame, adjusting screw 2 is fixedly mounted on the output end of motor 2, and a threaded slider is threadedly connected to the outer wall of the adjusting screw 2.

[0009] Preferably, the deflection assembly includes a servo motor, a servo motor is fixedly mounted on the side wall of the U-shaped frame, a pinion is fixedly mounted on the output end of the servo motor, a transmission sleeve is rotatably mounted on the bottom outer wall of the U-shaped frame, the transmission sleeve passes through and is fixedly mounted with a gear ring, a positioning plate is fixedly mounted on the arcuate outer wall of the camera, a transmission ring is fixedly mounted on the bottom end of the transmission sleeve, one end of a connecting rod is hinged on the arcuate outer wall of the transmission ring, and the other end of the connecting rod is hinged with a swing seat, a rotating rod is rotatably mounted on the inner wall of the positioning plate, the rotating rod passes through the swing seat and is fixedly connected to the swing seat, a volute spring is sleeved on the arcuate outer wall of the rotating rod, an illuminating lamp is arranged at the bottom of the swing seat, an adjustment assembly that can continuously and stably rotate the swing seat is arranged inside the positioning plate, and a stabilizing assembly that can further provide stable guidance for the swing seat is arranged at the bottom of the positioning plate.

[0010] Preferably, the threaded slider is arranged in a square shape, and the inner wall of the transmission frame is provided with a square groove matched with the threaded slider, so that when the motor 2 is started, the rotation of the adjusting screw 2 is coordinated so that the threaded slider can move linearly along the inner wall of the square groove, and the outer walls on both sides of the transmission frame are provided with straight grooves whose width is matched with the width of the connection part between the threaded slider and the U-shaped frame, so that the threaded slider can drive the U-shaped frame to move synchronously when it moves linearly along the inner wall of the square groove.

[0011] Preferably, the interior of the positioning plate is hollow, and the top of the positioning plate is provided with an annular groove whose width matches the thickness of the transmission sleeve, so that the bottom end of the transmission sleeve can extend into the cavity inside the positioning plate. The thickness of the transmission ring is matched with the height of the internal cavity of the positioning plate, so that the transmission sleeve can drive the transmission ring to rotate in the internal cavity of the positioning plate when it rotates. The bottom of the positioning plate is provided with a swing groove whose width matches the width of the swing seat, so as to facilitate the installation and rotation of the swing seat.

[0012] Preferably, the adjustment assembly includes a fixed plate, a fixed plate is fixedly installed on the inner wall of the positioning plate, the side wall of the fixed plate is rotatably connected to the rotating rod, the outer wall of the rotating rod is sleeved with a sleeve, the sleeve is movably connected to the rotating rod, the end of the sleeve is rotatably connected to a movable plate, the side wall of the movable plate is fixedly connected to the end of the spiral spring, a spiral groove is opened on the arc-shaped inner wall of the sleeve, a contact ball is fixedly installed on the arc-shaped outer wall of the rotating rod, and the contact ball is arranged inside the spiral groove.

[0013] Preferably, the stabilizing assembly includes a guide block, a guide block is fixedly installed on the lower surface of the positioning plate, a V-shaped groove is provided on the outer wall of the guide block on the side close to the swing seat, an arc-shaped groove is provided on the inner wall of the guide block, a convex ridge is fixedly installed on the inner surface of the arc-shaped groove, a transmission rod is penetrated and rotatably installed on the inner wall of the swing seat, a contact ring is sleeved on the outer wall of the transmission rod, a reset spring is fixedly connected to the side wall of the contact ring, a limiting airbag is fixedly installed on the end of the contact ring away from the reset spring, and a square airbag is fixedly installed on the arc-shaped outer wall of the end of the limiting airbag away from the contact ring.

[0014] Preferably, a cylindrical hole is opened on the inner wall of the transmission rod, and the limiting airbag and the return spring are both arranged in the cylindrical hole. The limiting airbag and the return spring are provided in two groups, and the two groups of limiting airbags and the return spring are symmetrically arranged at the left and right ends of the transmission rod with the vertical central axis of the transmission rod as the symmetry axis.

[0015] Preferably, a limiting component is provided on the arc-shaped outer wall of the limiting airbag, and the limiting component includes a protruding airbag, and the protruding airbag is fixedly mounted on the arc-shaped outer wall of the limiting airbag, and the protruding airbag is arranged in a V-shape, and a plurality of groups of rubber convex balls are provided on the outer surface of the protruding airbag, and a cross groove is provided on the spherical surface of the rubber convex ball, and a V-shaped hole whose size matches the shape of the protruding airbag is provided at the end of the transmission rod, and the protruding airbag is through-connected with the inner wall of the limiting airbag.

[0016] The present invention provides a method for detecting surface machining accuracy of a precision mold based on machine vision, comprising the following steps:

[0017] S1. Place the workpiece to be inspected on the base and position it;

[0018] S2, start the camera and the lighting at the bottom of the swing seat to shoot the surface of the workpiece to be inspected;

[0019] S3, controlling the start motor 1 and the start motor 2 through an external controller, cooperating with the adjustment screw 1 and the adjustment screw 2, changing the specific positions of the U-shaped frame and the camera, so as to take pictures and collect data of different positions of the workpiece placed on the base;

[0020] S4, summarizing the data collected in S3, uploading it to an external controller for integrated calculation, and obtaining the processing accuracy data of the workpiece to be inspected.

[0021] Compared with the prior art, the present invention provides a device and method for detecting the surface machining accuracy of a precision mold based on machine vision, which has the following beneficial effects:

[0022] 1. A deflection assembly is provided, which cooperates with the driving of the pinion and the gear ring to rotate the transmission ring, and cooperates with the connecting rod to pull the swing seat to cause the swing seat to rotate with the rotating rod as the rotation axis, thereby changing the direction of the bottom end of the swing seat, thereby providing illumination for different positions within the shooting range of the camera, and at the same time, the elastic force of the volute spring is limited when the rotating rod rotates, so that the swing seat maintains a relatively stable lighting state, thereby ensuring the shooting effect of the camera, thereby improving the overall measurement accuracy of the device.

[0023] 2. By providing an adjustment component, as the rotation angle of the swing seat increases, the contact ball guides and restricts the spiral groove, so as to prompt the sleeve to push the movable plate to move laterally along the inner wall of the positioning plate, so as to change the compression length of the volute spring, and then appropriately reduce the compression force of the volute spring, so that the volute spring can prompt the swing seat to remain stable without generating a large pulling force on the rotating rod, thereby reducing the service life of the volute spring, thereby adversely affecting the subsequent swing seat to provide a stable lighting effect.

[0024] 3. By providing a stabilizing component, the contact ring will be guided and restricted by the V-shaped groove when the swing seat rotates, so that the contact ring will move linearly along the inner wall of the transmission rod to squeeze the limiting airbag and prompt it to fill the square airbag, so that the latter is full and extends out of the outside of the transmission rod to cooperate with the convex ridges in the arc groove to achieve the restriction of the end position of the transmission rod, further ensure the stability of the swing seat under the positioning plate, thereby ensuring that the lighting can provide high stable lighting when the camera is shooting and measuring, and ensure the measurement accuracy of the device.

[0025] 4. By providing a limiting component, when the limiting airbag is squeezed and the protruding airbag is filled, the protruding airbag will extend from the V-shaped hole and make its outer wall contact with the inner surface of the arc groove, cooperate with the rubber convex ball and the cross groove and convex ridges on its spherical surface to better ensure the stability between the transmission rod and the arc groove, and then ensure the stability between the transmission rod and the swing seat and the guide block, so that the lighting lamp arranged at the bottom of the swing seat can provide a stable lighting effect when the camera is shooting, so as to ensure the precision and accuracy of the device during measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of the present invention without the base and top frame;

[0028] Figure 3 This is a schematic diagram of the structure of the shooting component of the present invention;

[0029] Figure 4 It is a schematic diagram of the cross-sectional structure of the positioning disk of the present invention;

[0030] Figure 5 It is a schematic diagram of a partial three-dimensional structure of the swing seat of the present invention;

[0031] Figure 6 It is a schematic diagram of a partial three-dimensional structure of a guide block of the present invention;

[0032] Figure 7 This is a partial exploded schematic diagram of the adjustment assembly of the present invention;

[0033] Figure 8 It is a schematic diagram of the cross-sectional structure of the transmission rod of the present invention;

[0034] Fig. 9 This is a schematic diagram of the restricting airbag structure in the second embodiment of the present invention;

[0035] Fig.10 It is a schematic diagram of the protruding airbag structure in the second embodiment of the present invention.

[0036] In the figure: 1, base; 2, support rod; 3, top frame; 4, shooting assembly; 41, motor 1; 42, adjusting screw rod 1; 43, transmission frame; 44, threaded sleeve; 45, motor 2; 46, adjusting screw rod 2; 47, threaded slider; 48, U-shaped frame; 49, camera; 5, deflection assembly; 51, servo motor; 52, pinion; 53, transmission sleeve; 54, gear ring; 55, positioning plate; 56, transmission ring; 57, connecting rod; 58, rotating rod; 59 , swing seat; 510, scroll spring; 6, adjustment assembly; 61, fixed plate; 62, movable plate; 63, sleeve; 64, spiral slide groove; 65, contact ball; 7, stabilizing assembly; 71, guide block; 72, V-shaped groove; 73, arc groove; 74, convex ridge; 75, transmission rod; 76, contact ring; 77, return spring; 78, limiting airbag; 79, square airbag; 8, limiting assembly; 81, protruding airbag; 82, rubber convex ball; 83, cross groove. DETAILED DESCRIPTION

[0037] Embodiment 1: Figure 1-Figure 8As shown, the present invention provides a technical solution: a precision mold surface processing accuracy detection device based on machine vision, including a base 1, a support rod 2 is fixedly installed on the upper surface of the base 1, a top frame 3 is fixedly installed on the top of the support rod 2, a shooting component 4 is arranged inside the top frame 3 and can adjust the shooting position of the precision detection of the workpiece to be detected on the base 1, the shooting component 4 includes a transmission frame 43 slidably installed on the inner wall of the top frame 3, a U-shaped frame 48 is slidably installed on the side wall of the transmission frame 43, a camera 49 is fixedly installed on the bottom of the U-shaped frame 48, and a deflection component 5 with adjustable lighting direction is arranged on the outside of the camera 49 to reinforce the shooting accuracy of the camera 49.

[0038] In one embodiment of the present invention, the shooting assembly 4 includes a motor 41, a motor 41 is fixedly installed on the side wall of the top frame 3, an adjusting screw 42 is fixedly installed on the output end of the motor 41, a threaded sleeve 44 is fixedly installed on the top of the transmission frame 43, the threaded sleeve 44 is threadedly connected to the adjusting screw 42, a motor 45 is fixedly installed on the outer wall of the end of the transmission frame 43, an adjusting screw 46 is fixedly installed on the output end of the motor 45, and a threaded slider 47 is threadedly connected to the outer wall of the adjusting screw 46.

[0039] Specifically, the deflection assembly 5 includes a servo motor 51, a servo motor 51 is fixedly installed on the side wall of the U-shaped frame 48, a pinion 52 is fixedly installed on the output end of the servo motor 51, a transmission sleeve 53 is rotatably installed on the bottom outer wall of the U-shaped frame 48, the transmission sleeve 53 passes through and is fixedly installed with a gear ring 54, a positioning plate 55 is fixedly installed on the arc-shaped outer wall of the camera 49, a transmission ring 56 is fixedly installed on the bottom end of the transmission sleeve 53, one end of a connecting rod 57 is hinged on the arc-shaped outer wall of the transmission ring 56, and the other end of the connecting rod 57 is hinged with a swing seat 59, a rotating rod 58 is rotatably installed on the inner wall of the positioning plate 55, the rotating rod 58 passes through the swing seat 59 and is fixedly connected to the swing seat 59, a volute spring 510 is sleeved on the arc-shaped outer wall of the rotating rod 58, and an illuminating lamp is arranged at the bottom of the swing seat 59.

[0040] Furthermore, protrusions with a cross-section smaller than that of the ends of the transmission frame 43 are provided at both ends of the transmission frame 43, and a rectangular groove matched with the protrusion is provided on the inner wall of the top frame 3, so that the transmission frame 43 is guided and restricted by the protrusion and can only move linearly along the side wall of the top frame 3 along the rectangular groove. At the same time, the threaded slider 47 is set to be square, and a square groove matched with the threaded slider 47 is provided on the inner wall of the transmission frame 43, so that when the motor 45 is started, the rotation of the adjusting screw 46 is coordinated, so that the threaded slider 47 can move linearly along the inner wall of the square groove. Specifically, straight grooves with a width matched with the width of the connection between the threaded slider 47 and the U-shaped frame 48 are provided on the outer walls on both sides of the transmission frame 43, so that the threaded slider 47 can move linearly along the inner wall of the square groove. When the slider 47 performs linear motion along the inner wall of the square groove, it can drive the U-shaped frame 48 to perform synchronous motion, so that with the cooperation of motor 1 41 and motor 2 45, the U-shaped frame 48 can drive the camera 49 to perform two-axis linear motion within the surrounding range of the top frame 3, and then the specific position of the camera 49 can be more finely adjusted in this area to achieve dimensional shooting and measurement of precision-machined workpieces of different sizes. Specifically, a controller is provided on the outside of the equipment, and motor 1 41 and motor 2 45 are electrically connected to an external controller through wires to control the operating status of motor 1 41 and motor 2 45, so as to adjust the shooting position of camera 49 according to the actual measurement requirements of the precision-machined workpiece.

[0041] In addition, the side wall of the U-shaped frame 48 is provided with a mounting plate to facilitate the installation of the servo motor 51. At the same time, the gear ring 54 meshes with the pinion 52 to realize transmission. When the servo motor 51 is started, the transmission of the pinion 52 and the gear ring 54 is coordinated to make the transmission sleeve 53 at the bottom of the U-shaped frame 48 rotate. Specifically, the interior of the positioning plate 55 is hollow, and the top of the positioning plate 55 is provided with an annular groove whose width matches the thickness of the transmission sleeve 53, so that the bottom end of the transmission sleeve 53 can be inserted into the interior of the positioning plate 55. At the same time, the thickness of the transmission ring 56 is adapted to the height of the internal cavity of the positioning plate 55, so that the transmission sleeve 53 can drive the transmission ring 56 to rotate in the internal cavity of the positioning plate 55 when rotating. Further, a swing groove with a width adapted to the width of the swing seat 59 is opened at the bottom of the positioning plate 55 to facilitate the installation and rotation of the swing seat 59. Specifically, the number of connecting rods 57, rotating rods 58 and swing seats 59 is set in multiple groups, and the multiple groups of connecting rods 57, rotating rods 58 and swing seats 59 are circumferential. The array is evenly distributed at the bottom of the positioning plate 55, so that the movement of the transmission sleeve 53 can simultaneously adjust the multiple groups of swing seats 59 arranged below the positioning plate 55, so as to facilitate the lighting requirements of the camera 49 for shooting. After adjusting the positions of the U-shaped frame 48 and the camera 49 by controlling the motor 1 41 and the motor 2 45, the lighting lamp below the swing seat 59 is started to provide light supplement for the surface of the precision mold workpiece to be inspected below, so as to facilitate the camera 49 to take accurate pictures. At the same time, the servo motor 51 is started, and the drive ring 56 is driven by the pinion 52 and the gear ring 54 to rotate, and the connecting rod 57 is used to pull the swing seat 59 to cause the swing seat 59 to rotate with the rotating rod 58 as the rotating axis, thereby changing the bottom end direction of the swing seat 59, so as to provide lighting for different positions within the shooting range of the camera 49, and at the same time, the elastic force limit of the volute spring 510 when the rotating rod 58 rotates makes the swing seat 59 maintain a relatively stable lighting state, thereby ensuring the shooting effect of the camera 49, thereby improving the overall measurement accuracy of the device.

[0042] In an embodiment of the present invention, an adjustment component 6 is provided inside the positioning plate 55, which can continuously and stably adjust the swing seat 59 when it rotates. The adjustment component 6 includes a fixed plate 61. The inner wall of the positioning plate 55 is fixedly installed with the fixed plate 61. The side wall of the fixed plate 61 is rotatably connected to the rotating rod 58. The outer wall of the rotating rod 58 is sleeved with a sleeve 63. The sleeve 63 is movably connected to the rotating rod 58. The end of the sleeve 63 is rotatably connected with a movable plate 62. The side wall of the movable plate 62 is fixedly connected to the end of the spiral spring 510. A spiral groove 64 is opened on the arc-shaped inner wall of the sleeve 63. A contact ball 65 is fixedly installed on the arc-shaped outer wall of the rotating rod 58. The contact ball 65 is arranged inside the spiral groove 64.

[0043] Specifically, there are two groups of fixed plates 61, and the two groups of fixed plates 61 are mirror-imaged at the two ends of the rotating rod 58 to facilitate the horizontal installation of the rotating rod 58 inside the positioning plate 55. At the same time, the inner wall of the sleeve 63 is provided with a hole whose diameter matches the outer diameter of the rotating rod 58, so as to facilitate the movement of the sleeve 63 on the outside of the rotating rod 58. Furthermore, the two ends of the spiral spring 510 are respectively fixedly connected to the side wall of the movable plate 62 and the arc-shaped outer wall of the rotating rod 58, so that when the rotating rod 58 rotates, due to the elastic force of the spiral spring 510, the rotating rod 58 always has a movement tendency of reverse rotation to achieve reset. At the same time, when the transmission ring 56 rotates, it cooperates with the pulling of the connecting rod 57 to prompt the swing seat 59 to rotate. The rod 58 rotates with the rotation center as the center. At this time, due to the elastic force of the spiral spring 510, a reverse rotation force is applied to the rotating rod 58 to maintain the balance of the swing seat 59. As the rotation angle of the swing seat 59 increases, the contact ball 65 guides and restricts the spiral groove 64 to prompt the sleeve 63 to push the movable plate 62 to move laterally along the inner wall of the positioning plate 55 to change the compression length of the spiral spring 510, thereby appropriately reducing the compression force of the spiral spring 510, so that the spiral spring 510 can prompt the swing seat 59 to remain stable without generating a large pulling force on the rotating rod 58, thereby reducing the service life of the spiral spring 510, thereby adversely affecting the subsequent swing seat 59 to provide a stable lighting effect.

[0044] Furthermore, a stabilizing component 7 is provided at the bottom of the positioning plate 55, which can further provide stable guidance for the swing seat 59. The stabilizing component 7 includes a guide block 71, and the guide block 71 is fixedly installed on the lower surface of the positioning plate 55. A V-shaped groove 72 is provided on the outer wall of the guide block 71 on the side close to the swing seat 59, and an arc groove 73 is provided on the inner wall of the guide block 71. A convex ridge 74 is fixedly installed on the inner surface of the arc groove 73. A transmission rod 75 passes through and is rotatably installed on the inner wall of the swing seat 59. A contact ring 76 is sleeved on the outer wall of the transmission rod 75. A reset spring 77 is fixedly connected to the side wall of the contact ring 76. A limiting airbag 78 is fixedly installed on the end of the contact ring 76 away from the reset spring 77, and a square airbag 79 is fixedly installed on the arc-shaped outer wall of the end of the limiting airbag 78 away from the contact ring 76.

[0045] In the embodiment of the present invention, the number of guide blocks 71 is set to two groups, and the two groups of guide blocks 71 are symmetrically arranged with the vertical central axis of the swing seat 59 as the symmetry axis. At the same time, the inner diameter of the arc groove 73 is adapted to the outer diameter of the transmission rod 75, so that the end of the transmission rod 75 can move inside the arc groove 73. In addition, the number of convex ribs 74 is set to several groups, and the several groups of convex ribs 74 are evenly distributed on the upper and lower arc-shaped inner surfaces of the arc groove 73. Further, the inner wall of the transmission rod 75 is provided with a cylindrical hole, and the limiting airbag 78 and the return spring 77 are both arranged in the cylindrical hole. Specifically, the number of limiting airbags 78 and the return spring 77 is set to two groups, and the two groups of limiting airbags 78 and the return spring 77 are symmetrically arranged at the left and right ends of the transmission rod 75 with the vertical central axis of the transmission rod 75 as the symmetry axis. At the same time, the contact ring 76 includes an outer ring and an inner disk. A square connecting portion is provided between the outer ring and the inner disk. Specifically, a square connecting groove matched with the square connecting portion is opened on the arc-shaped outer wall of the transmission rod 75, so that the contact ring 76 will be guided and restricted by the V-shaped groove 72 when the swing seat 59 rotates, so that the contact ring 76 will move linearly along the inner wall of the transmission rod 75 to squeeze the limiting airbag 78. Specifically, the limiting airbag 78 is through-connected with the inner wall of the square airbag 79, so that after the limiting airbag 78 is squeezed, it will fill the square airbag 79, so that the latter will extend out of the outside of the transmission rod 75 in a full shape, so as to cooperate with the convex ridge 74 in the arc-shaped groove 73, thereby realizing the restriction of the end position of the transmission rod 75, further ensuring the stability of the swing seat 59 under the positioning plate 55, thereby ensuring that the lighting lamp can provide higher stable lighting when the camera 49 is taking pictures and measuring, thereby ensuring the measurement accuracy of the device.

[0046] Example 2: Please refer to the attached manual for details. Figure 9-10On the basis of the first embodiment, a limiting component 8 is provided on the arc-shaped outer wall of the limiting airbag 78, and the limiting component 8 includes a protruding airbag 81. The protruding airbag 81 is fixedly installed on the arc-shaped outer wall of the limiting airbag 78. The protruding airbag 81 is arranged in a V shape. A plurality of groups of rubber convex balls 82 are arranged on the outer surface of the protruding airbag 81. A cross groove 83 is provided on the spherical surface of the rubber convex ball 82. Specifically, the number of the protruding airbags 81 is provided in a plurality of groups, and the plurality of groups of protruding airbags 81 are arranged in a circular array on the arc-shaped outer wall of the limiting airbag 78 away from the contact ring 76. At the same time, a V-shaped hole whose size is adapted to the shape of the protruding airbag 81 is provided at the end of the transmission rod 75. , and the protruding airbag 81 is connected with the inner wall of the limiting airbag 78, so that when the limiting airbag 78 is squeezed and fills the protruding airbag 81, the protruding airbag 81 will extend from the V-shaped hole and make its outer wall contact with the inner surface of the arc groove 73, cooperate with the rubber convex ball 82 and the cross groove 83 and the convex ridge 74 on its spherical surface to better ensure the stability between the transmission rod 75 and the arc groove 73, and then ensure the stability between the transmission rod 75 and the swing seat 59 and the guide block 71, so that the lighting lamp arranged at the bottom of the swing seat 59 can provide a stable lighting effect when the camera 49 is shooting, so as to ensure the precision and accuracy of the device during measurement.

[0047] In the present invention, when in use, the workpiece to be measured is placed on the base 1. At this time, the motor 1 41 and the motor 2 45 are started by the external controller, and the adjusting screw 1 42 and the adjusting screw 2 46 are coordinated to adjust the position of the U-shaped frame 48 within the surrounding range of the top frame 3, and then adjust the shooting position of the camera 49, so as to realize the measurement of the surface processing dimensional accuracy of the workpieces to be measured of different sizes. In the measurement process, the servo motor 51 is started by the external controller, and the pinion 52 and the gear ring 54 are coordinated to drive the transmission sleeve 53 and the transmission ring 56 to rotate. At this time, the swing seat 59 is driven by the connecting rod 57 to rotate with the rotating rod 58 as the rotation axis, thereby changing the irradiation direction of the lighting lamp arranged at the bottom of the swing seat 59, so as to provide lighting for different positions of the workpiece to be measured placed at the bottom, so that the image acquisition data of the camera 49 is more accurate, thereby ensuring the measurement accuracy of the device.

[0048] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A precision mold surface processing accuracy detection device based on machine vision, comprising a base (1), a support rod (2) fixedly mounted on the upper surface of the base (1), a top frame (3) fixedly mounted on the top of the support rod (2), a shooting component (4) adjustable for shooting the position of the workpiece to be detected on the base (1), characterized in that: The shooting assembly (4) comprises a transmission frame (43) slidably mounted on the inner wall of the top frame (3); a U-shaped frame (48) is slidably mounted on the side wall of the transmission frame (43); a camera (49) is fixedly mounted on the bottom of the U-shaped frame (48); and a deflection assembly (5) capable of adjusting the lighting direction and enhancing the camera shooting accuracy is arranged on the outer side of the camera (49); The shooting assembly (4) comprises a motor 1 (41), a motor 1 (41) is fixedly mounted on the side wall of the top frame (3), an adjusting screw rod 1 (42) is fixedly mounted on the output end of the motor 1 (41), a threaded sleeve (44) is fixedly mounted on the top of the transmission frame (43), the threaded sleeve (44) is threadedly connected to the adjusting screw rod 1 (42), a motor 2 (45) is fixedly mounted on the outer wall of the end of the transmission frame (43), an adjusting screw rod 2 (46) is fixedly mounted on the output end of the motor 2 (45), and a threaded slider (47) is threadedly connected to the outer wall of the adjusting screw rod 2 (46), the deflection assembly (5) comprises a servo motor (51), a servo motor (51) is fixedly mounted on the side wall of the U-shaped frame (48), a pinion (52) is fixedly mounted on the output end of the servo motor (51), a transmission sleeve (53) is rotatably mounted on the outer wall of the bottom of the U-shaped frame (48), and the transmission sleeve (53) is rotatably mounted on the outer wall of the bottom of the transmission frame (48), The movable sleeve (53) passes through and is fixedly mounted with a gear ring (54); a positioning plate (55) is fixedly mounted on the arc-shaped outer wall of the camera (49); a transmission ring (56) is fixedly mounted on the bottom end of the transmission sleeve (53); one end of a connecting rod (57) is hingedly connected to the arc-shaped outer wall of the transmission ring (56); the other end of the connecting rod (57) is hingedly connected to a swing seat (59); a rotating rod (58) is rotatably mounted on the inner wall of the positioning plate (55); the rotating rod (58) passes through the swing seat (59) and is fixedly connected to the swing seat (59); a spiral spring (510) is sleeved on the arc-shaped outer wall of the rotating rod (58); an illuminating lamp is arranged at the bottom of the swing seat (59); an adjusting component (6) is arranged inside the positioning plate (55) to continuously and stably rotate the swing seat (59); and a stabilizing component (7) is arranged at the bottom of the positioning plate (55) to further provide stable guidance for the swing seat (59).

2. The device for detecting surface machining accuracy of precision molds based on machine vision according to claim 1, characterized in that: The threaded slider (47) is arranged in a square shape, and the inner wall of the transmission frame (43) is provided with a square groove matched with the threaded slider (47), and the outer walls on both sides of the transmission frame (43) are provided with straight grooves whose width is matched with the width of the connection portion between the threaded slider (47) and the U-shaped frame (48).

3. The device for detecting surface machining accuracy of precision molds based on machine vision according to claim 1, characterized in that: The interior of the positioning plate (55) is hollow, and the top of the positioning plate (55) is provided with an annular groove whose width matches the thickness of the transmission sleeve (53), the thickness of the transmission ring (56) matches the height of the internal cavity of the positioning plate (55), and the bottom of the positioning plate (55) is provided with a swing groove whose width matches the width of the swing seat (59).

4. The device for detecting surface machining accuracy of precision molds based on machine vision according to claim 1, characterized in that: The adjustment assembly (6) comprises a fixed plate (61), the inner wall of the positioning plate (55) is fixedly mounted with the fixed plate (61), the side wall of the fixed plate (61) is rotatably connected to the rotating rod (58), the outer wall of the rotating rod (58) is sleeved with a sleeve (63), the sleeve (63) is movably connected to the rotating rod (58), the end of the sleeve (63) is rotatably connected with a movable plate (62), the side wall of the movable plate (62) is fixedly connected to the end of the spiral spring (510), the arc-shaped inner wall of the sleeve (63) is provided with a spiral groove (64), the arc-shaped outer wall of the rotating rod (58) is fixedly mounted with a contact ball (65), and the contact ball (65) is arranged inside the spiral groove (64).

5. The device for detecting surface machining accuracy of precision molds based on machine vision according to claim 1, characterized in that: The stabilizing assembly (7) comprises a guide block (71), the guide block (71) being fixedly mounted on the lower surface of the positioning plate (55), a V-shaped groove (72) being provided on the outer wall of the guide block (71) on a side close to the swing seat (59), an arcuate groove (73) being provided on the inner wall of the guide block (71), a convex ridge (74) being fixedly mounted on the inner surface of the arcuate groove (73), a transmission rod (75) penetrating the inner wall of the swing seat (59) and being rotatably mounted thereon, a contact ring (76) being sleeved on the outer wall of the transmission rod (75), a return spring (77) being fixedly connected to the side wall of the contact ring (76), a limiting airbag (78) being fixedly mounted on one end of the contact ring (76) away from the return spring (77), and a square airbag (79) being fixedly mounted on the arcuate outer wall of one end of the limiting airbag (78) away from the contact ring (76).

6. The device for detecting surface machining accuracy of precision molds based on machine vision according to claim 5, characterized in that: A cylindrical hole is formed on the inner wall of the transmission rod (75), and the limiting airbag (78) and the return spring (77) are both arranged in the cylindrical hole. The limiting airbag (78) and the return spring (77) are provided in two groups, and the two groups of limiting airbags (78) and the return spring (77) are symmetrically arranged at the left and right ends of the transmission rod (75) with the vertical central axis of the transmission rod (75) as the symmetry axis.

7. The device for detecting surface machining accuracy of precision molds based on machine vision according to claim 5, characterized in that: A limiting assembly (8) is arranged on the arc-shaped outer wall of the limiting airbag (78), and the limiting assembly (8) includes a protruding airbag (81). The protruding airbag (81) is fixedly mounted on the arc-shaped outer wall of the limiting airbag (78), and the protruding airbag (81) is arranged in a V shape. A plurality of groups of rubber convex balls (82) are arranged on the outer surface of the protruding airbag (81), and a cross groove (83) is provided on the spherical surface of the rubber convex ball (82). A V-shaped hole whose size matches the outer shape of the protruding airbag (81) is provided at the end of the transmission rod (75), and the protruding airbag (81) is connected to the inner wall of the limiting airbag (78) through the protruding airbag (81).

8. The detection method of the precision mold surface processing accuracy detection device based on machine vision according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, placing the workpiece to be inspected on the base (1) and positioning it; S2, starting the camera (49) and the lighting lamp at the bottom of the swing seat (59) to photograph the surface of the workpiece to be inspected; S3, controlling the start motor 1 (41) and the motor 2 (45) through an external controller, cooperating with the adjustment screw 1 (42) and the adjustment screw 2 (46), changing the specific positions of the U-shaped frame (48) and the camera (49), so as to take pictures and collect data at different positions of the workpiece placed on the base (1); S4, summarizing the data collected in S3, uploading it to an external controller for integrated calculation, and obtaining the processing accuracy data of the workpiece to be inspected.

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