Current sensor appearance visual inspection machine and method

Abstract

This invention relates to the field of appearance inspection devices, specifically to a visual inspection machine and method for current sensors. The inspection machine includes: a machine base having a mounting surface with a lifting slot; a measuring stage for placing the current sensor to be tested, movably positioned within the lifting slot along a Z-axis perpendicular to the mounting surface, the measuring stage having a first height and a second height along the Z-axis; an image capturing device positioned directly opposite the current sensor to be tested on the measuring stage; and a positioning device for positioning the current sensor to be tested at the desired position on the measuring stage, the positioning device including four positioning components arranged around the measuring stage. This invention, by providing a positioning device for positioning the current sensor to be tested at the desired position on the measuring stage, can locate and inspect current sensors of different sizes.

Description

Technical Field

[0001] This invention relates to the field of appearance inspection devices, specifically to a current sensor appearance visual inspection machine and inspection method. Background Technology

[0002] In the later stages of current sensor production, vision inspection machines are often used to replace human eyes in measuring and judging the appearance quality of workpieces and screening out unqualified products. Vision inspection machines mainly capture target products using vision cameras (CMOS or CCD), convert them into image signals, and transmit them to an image processing system to obtain morphological information. The image system processes the signals to extract target features and then controls the on-site equipment based on the judgment results to remove unqualified products. To improve the imaging effect, the workpiece to be tested needs to be accurately placed in the testing position. Currently, traditional vision inspection machines mainly rely on manual positioning of the workpiece. Manual positioning suffers from low positioning accuracy. Although there are methods to improve the positioning accuracy, such as setting a groove that matches the shape of the workpiece at the testing position, this method, while feasible, cannot accurately position workpieces of different sizes due to the fixed size of the groove. To address these problems, this invention proposes a vision inspection machine and method for the appearance of current sensors. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a visual inspection machine and method for the appearance of current sensors. This visual inspection machine can locate current sensors of different sizes to be tested.

[0004] To achieve the above objectives, according to one aspect of the present invention, a visual inspection machine for the appearance of a current sensor is provided, comprising:

[0005] A machine base having a mounting surface, wherein a lifting slot is provided on the mounting surface;

[0006] A measuring platform for placing a current sensor to be measured, and movably disposed in the lifting slot along a Z-axis direction perpendicular to the mounting surface; the measuring platform has a first height and a second height along the Z-axis direction.

[0007] An image capturing device is arranged facing the current sensor to be measured on the measuring stage; and

[0008] A positioning device is used to position the current sensor to be measured on the measuring platform at the test position. The positioning device includes four positioning components arranged around the measuring platform. Each positioning component includes an elastic band and a positioning element. The first end of the elastic band is fixed to the measuring platform, and the second end of the elastic band is fixed to the mounting surface of the platform. The positioning element is fixed between the first end and the second end of the elastic band and is capable of moving towards the current sensor to be measured when the measuring platform moves from a first height to a second height.

[0009] Optionally, the four positioning components include two X-axis positioning components arranged opposite each other along the X-axis direction and two Y-axis positioning components arranged opposite each other along the Y-axis direction. The X-axis direction, the Y-axis direction, and the Z-axis direction are perpendicular to each other. The machine base is provided with two discharge ports arranged along the X-axis direction, corresponding to the positions of the two X-axis positioning components respectively. The current sensor appearance visual inspection machine also includes a locking mechanism. The locking mechanism selectively locks the positioning elements of the two Y-axis positioning components and the positioning elements of any two X-axis positioning components simultaneously on the machine base, so as to restrict or allow the positioning elements of the two Y-axis positioning components to move relative to the machine base along the Y-axis and the positioning element of the selected X-axis positioning component to move relative to the machine base along the X-axis direction.

[0010] Optionally, the positioning element of the X-axis positioning assembly includes a fixed part and a folding part. The fixed part is fixed to the elastic band. The locking mechanism selectively locks the fixed part of the positioning element to the machine platform. The fixed part is folded and connected to the folding part on the side facing the measuring platform. A locking pin is elastically provided on the folding part. The fixed part is provided with a locking hole that engages with the locking pin. Each X-axis positioning assembly also includes a pusher fixed to the first end of the elastic band. In the X-axis positioning assembly where the fixed part of the positioning element is locked by the locking mechanism, the pusher can push the locking pin out of the locking hole when the measuring platform moves from the first height to the second height, and cause the folding part of the positioning element to flip away from the discharge port. Optionally, the locking mechanism includes a limiting frame and a rotary drive for driving the limiting frame to rotate. The limiting frame has two first limiting portions arranged opposite each other in the X-axis direction and two second limiting portions arranged opposite each other in the Y-axis direction. The positioning members of the two X-axis positioning assemblies have first limiting mating portions that cooperate with the two first limiting portions, and the positioning members of the two Y-axis positioning assemblies have second limiting mating portions that cooperate with the two second limiting portions. Wherein, when the positioning member of the X-axis positioning assembly includes the fixed portion and the folding portion, the first limiting mating portion is disposed on the fixed portion.

[0011] Optionally, when the positioning element of the X-axis positioning assembly includes the fixed part and the folding part, the limiting frame also has a flipping limiting part for limiting the maximum flipping angle of the folding part of the positioning element.

[0012] Optionally, the machine platform is provided with two storage boxes, which are respectively located at positions corresponding to the two discharge ports.

[0013] Optionally, a rolling element is provided at one end of the positioning member near the measuring stage to reduce the friction between the positioning member and the current sensor under test.

[0014] Optionally, a positioning seat is fixedly provided on the machine base, and a positioning shaft is fixedly provided on the positioning component. The positioning component moves toward or away from the current sensor under test through the positioning cooperation between the positioning shaft and the positioning seat.

[0015] Optionally, the measuring stage includes an upper stage and a lower stage arranged along the Z-axis, and a support frame connected between the upper stage and the lower stage. The image capturing device includes a first camera and a second camera arranged along the Z-axis. The upper stage is made of a transparent or semi-transparent material. The first camera and the second camera are located on opposite sides of the upper stage, and the second camera is mounted on the lower stage.

[0016] According to another aspect of the present invention, a method for inspecting the appearance of a current sensor using the aforementioned current sensor appearance visual inspection machine is provided, comprising the following steps:

[0017] S100: Position the measuring stage at the first height and place the current sensor to be measured on the measuring stage;

[0018] S200: Manually adjust the position of the current sensor under test to place it as close as possible to the test position;

[0019] S300: Move the measuring platform from the first height position to the second height position, and use the positioning parts of the four positioning components to accurately position the current sensor to be measured to the position to be measured;

[0020] S400: Move the measuring platform from the second height position back to the first height position;

[0021] S500: Uses an image acquisition device to capture and detect the current sensor on the measuring stage;

[0022] S600: Remove the current sensor that has completed testing from the measuring platform and replace it with the next current sensor to be tested.

[0023] Compared with the prior art, the present invention provides a visual inspection machine and method for the appearance of current sensors, which has the following beneficial effects:

[0024] 1. The present invention provides a positioning device for positioning the current sensor under test on the measuring stage. This positioning device can position current sensors of different sizes, which solves the problem that the traditional visual inspection machine, which uses grooves to position the test piece, cannot accurately position test pieces of different sizes.

[0025] 2. Through the cooperation of four positioning components, this invention can not only realize the positioning function of the current sensor under test, but also cooperate with the locking mechanism to realize the classification function of the current sensor after measurement.

[0026] 3. Through the cooperation of the fixed part, folding part, locking pin, locking hole, pusher and other structures, the present invention can reduce the obstruction of the discharge port caused by the positioning part of the other X-axis positioning component when the positioning part of one X-axis positioning component pushes the current sensor into the corresponding discharge port, so as to ensure that the current sensor can fall into the discharge port smoothly and at the same time avoid the current sensor being damaged.

[0027] 4. The locking mechanism of the present invention includes a limiting frame and a rotary drive. Through the mutual cooperation of the first limiting part and the second limiting part of the limiting frame, the first limiting engagement part of the positioning part of the X-axis positioning assembly, the second limiting engagement part of the positioning part of the Y-axis positioning assembly, and the rotary drive, the locking mechanism achieves the purpose of selectively locking the positioning parts of the two Y-axis positioning assemblies and the positioning part of any one X-axis positioning assembly simultaneously on the machine. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the main structure of the present invention;

[0030] Figure 3 This is a schematic diagram of the positioning device, measuring platform, and driving equipment of the present invention;

[0031] Figure 4 This is a schematic diagram of the X-axis positioning component structure of the present invention;

[0032] Figure 5 For the present invention Figure 4 A magnified structural diagram at point A;

[0033] Figure 6 This is a schematic diagram of the locking mechanism structure of the present invention;

[0034] Figure 7This is a schematic diagram of the machine tool structure of the present invention.

[0035] In the diagram: 100, machine base; 110, mounting surface; 120, lifting slot; 130, discharge port; 140, positioning seat; 150, friction-reducing structure; 200, measuring platform; 210, upper platform; 220, lower platform; 230, support frame; 240, drive equipment; 300, current sensor; 400, X-axis positioning assembly; 410, Y-axis positioning assembly; 420, elastic band; 421, first end; 422, second end; 430, positioning component; 431, fixing. Part; 432, Folding part; 433, Locking pin; 434, Return spring; 435, Locking hole; 436, First limiting engagement part; 437, Second limiting engagement part; 438, Rolling element; 439, Positioning shaft; 440, Pushing element; 500, Locking mechanism; 510, Limiting frame; 511, First limiting part; 512, Second limiting part; 513, Flipping limiting part; 520, Rotation drive element; 600, Storage box; 700, First camera; 710, Second camera. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Example: Please refer to Figures 1 to 7 According to one aspect of the present invention, a visual inspection machine for the appearance of a current sensor is provided, comprising: a machine base 100 having a mounting surface 110, the mounting surface 110 being the top surface of the machine base 100, and a lifting slot 120 provided on the mounting surface 110, the lifting slot 120 being provided in a slotted manner on the top surface of the machine base 100; a measuring stage 200 for placing a current sensor 300 to be tested, and being movably disposed within the lifting slot 120 along a Z-axis direction perpendicular to the mounting surface 110, the measuring stage 200 having a first height and a second height along the Z-axis direction, specifically, the movement of the measuring stage 200 along the Z-axis direction can be achieved manually or by a drive device 240, the drive device 240 being a cylinder, a hydraulic cylinder, or an electric push rod. Figure 1In the diagram, the Z-axis represents the vertical direction, with the first height being higher than the second height. The first and second heights represent the positions of the measuring platform 200 relative to the machine tool 100. An image acquisition device is positioned directly opposite the current sensor 300 to be tested on the measuring platform 200. This image acquisition device can be an existing vision camera, primarily used to capture images to detect surface defects in the current sensor 300. A positioning device is also included, used to position the current sensor 300 at the test position on the measuring platform 200. This positioning device comprises four positioning components arranged around the measuring platform 200. Each positioning component includes an elastic band 420 and a positioning element 430. The first end 421 of the elastic band 420 is fixed to the measuring platform 200, and the second end 422 of the elastic band 420 is fixed to the mounting surface 110 of the machine tool 100. The positioning element 430 is fixed between the first end 421 and the second end 422 of the elastic band 420, and the positioning element 430 can move towards the current sensor 300 as the measuring platform 200 moves from the first height to the second height. The elastic band 420 can be a spring or a rubber band. In this example, the elastic band 420 is a flat rubber band. The fixing methods between the elastic band 420 and the measuring table 200, between the elastic band 420 and the mounting surface 110, and between the positioning member 430 and the elastic band 420 include, but are not limited to, bolt connections.

[0038] The current sensor visual inspection machine with the above structure operates as follows: First, the measuring stage 200 is positioned at a first height. The current sensor 300 to be tested is placed on the measuring stage 200, and its position is manually adjusted to be as close as possible to the test position. Next, the measuring stage 200 is moved from the first height position to a second height position. During this movement, the portion between the first end 421 and the second end 422 of the elastic band 420 is stretched. As the elastic band 420 stretches, the positioning members 430 of the four positioning components move simultaneously towards the measuring stage 200 until the current sensor 300 is clamped by the four positioning members 430. At this point, the position of the current sensor 300 is closer to the test position, thus achieving precise positioning of the current sensor 300. This method can position current sensors 300 of different sizes, solving the problem that traditional visual inspection machines using grooves to position the test piece cannot accurately position test pieces of different sizes.

[0039] It is important to note that when positioning current sensors 300 of different sizes, with the first height position fixed, the distance the measuring stage 200 travels from the first height position to the second height position should vary. This is to prevent the positioning component 430 from excessively compressing the current sensor 300 and causing damage. Specifically, when the current sensor 300 is smaller, the distance the measuring stage 200 travels from the first height position to the second height position is larger; when the current sensor 300 is larger, the distance the measuring stage 200 travels from the first height position to the second height position is smaller. In other words, while the first height position is fixed, the second height position is not fixed and can be adaptively adjusted according to the size of the current sensor 300.

[0040] like Figure 1 and Figure 2 As shown, in some embodiments, the four positioning components include two X-axis positioning components 400 arranged opposite each other along the X-axis direction and two Y-axis positioning components 410 arranged opposite each other along the Y-axis direction. The X-axis, Y-axis, and Z-axis directions are perpendicular to each other. The machine base 100 is provided with two discharge ports 130 arranged along the X-axis direction, corresponding to the positions of the two X-axis positioning components 400 respectively. Figure 1As shown, the left-right direction of the machine tool 100 can be defined as the X-axis direction, and the front-back direction of the machine tool 100 can be defined as the Y-axis direction. The two X-axis positioning components 400 include a left X-axis positioning component 400 located on the left side of the machine tool 100 and a right X-axis positioning component 400 located on the right side of the machine tool 100. The two discharge ports 130 include a left discharge port 130 located on the left side of the machine tool 100 and a right discharge port 130 located on the right side of the machine tool 100. The two discharge ports 130 can be part of the lifting slot 120 or can be set independently of the lifting slot 120. It is important to note that the elastic band 420 needs to be positioned to avoid the discharge port 130. Therefore, in this example, each X-axis positioning assembly 400 has two elastic bands 420, with the positioning element 430 fixed between the two elastic bands 420, forming a gap. The discharge port 130 is positioned within this gap, ensuring that the elastic bands 420 do not obstruct the discharge port 130 and also prevent the elastic bands 420 from exerting force on one side of the measuring stage 200. (Current) The sensor 300 appearance visual inspection machine also includes a locking mechanism 500. The locking mechanism 500 selectively locks simultaneously the positioning elements 430 of the two Y-axis positioning components 410 and the positioning element 430 of any one X-axis positioning component 400 onto the machine base 100. This restricts or allows the positioning elements 430 of the two Y-axis positioning components 410 to move relative to the machine base 100 along the Y-axis, and the positioning element 430 of the selected X-axis positioning component 400 to move relative to the machine base 100 along the X-axis. Through the coordinated operation of the locking mechanism 500 and the four positioning components, the current sensors 300 can be classified according to the appearance inspection results. Specifically, after the image capturing device captures and detects the current sensor 300 at the position to be measured on the measuring stage 200, the detection result can be divided into qualified and unqualified. When the detection result is qualified, the positioning parts 430 of the two Y-axis positioning components 410 and the positioning part 430 of the left X-axis positioning component 400 can be locked on the machine table 100 by the locking mechanism 500. Then, the measuring stage 200 is moved from the first height position to the second height position. At this time, the positioning parts 430 of the two Y-axis positioning components 410 and the positioning part 430 of the left X-axis positioning component 400 are locked on the machine table 100. The current sensor 300 will be restricted to move to the right, while the positioning member 430 of the right X-axis positioning assembly 400 can move normally to the left. The positioning member 430 moving normally to the left will push the current sensor 300 with a qualified detection result into the left discharge port 130. Similarly, when the detection result is unqualified, the locking mechanism 500 will restrict the movement of the positioning members 430 of the two Y-axis positioning assemblies 410 and the positioning member 430 of the right X-axis positioning assembly 400. The current sensor 300 will be pushed into the right discharge port 130 by the positioning member 430 of the left X-axis positioning assembly 400.In other words, the four positioning components can not only achieve the positioning function of the current sensor 300 under test through their cooperation, but also cooperate with the locking mechanism 500 to achieve the classification function of the current sensor 300 after measurement.

[0041] In the above embodiment, when the positioning member 430 of one X-axis positioning assembly 400 pushes the current sensor 300 into the corresponding discharge port 130, the positioning member 430 of the other X-axis positioning assembly 400 will at least partially obstruct the discharge port 130. This may cause the current sensor 300 to collide unnecessarily with the positioning member 430 as it passes through the discharge port 130, potentially preventing the current sensor 300 from accurately falling into the discharge port 130 and damaging the current sensor 300. Therefore, as... Figure 4 and Figure 5As shown, in some embodiments, the positioning member 430 of the X-axis positioning assembly 400 includes a fixed portion 431 and a folding portion 432. The fixed portion 431 is fixed to the elastic band 420. The locking mechanism 500 selectively locks the fixed portion 431 of the positioning member 430 to the machine base 100. The fixed portion 431 is folded and connected to the folding portion 432 on the side facing the measuring table 200. The folding portion 432 and the fixed portion 431 can be connected by a hinge or similar folding connection component. A locking pin 433 is elastically provided on the folding portion 432. Specifically, the folding portion 432 is provided with a mounting hole for installing the locking pin 433. The return spring 434 is elastically connected to the mounting hole, and the fixed part 431 is provided with a locking hole 435 that engages with the locking pin 433. Each X-axis positioning assembly 400 also includes a pusher 440 fixed to the first end 421 of the elastic band 420. The pusher 440 can be fixed to the elastic band 420 by adhesive or bolt connection. In the X-axis positioning assembly 400 in which the positioning part 430 of the fixed part 431 is locked by the locking mechanism 500, the pusher 440 can push the locking pin 433 out of the locking hole 435 when the measuring table 200 moves from the first height to the second height, and cause the folded part 432 of the positioning part 430 to flip away from the discharge port 130. Through the cooperation of the fixed part 431, the folding part 432, the locking pin 433, the locking hole 435, the pusher 440 and other structures, when the positioning part 430 of one X-axis positioning component 400 pushes the current sensor 300 into the corresponding discharge port 130, the obstruction caused by the positioning part 430 of the other X-axis positioning component 400 to the discharge port 130 is reduced, ensuring that the current sensor 300 can fall smoothly into the discharge port 130, while avoiding damage to the current sensor 300. Specifically, for example, when the positioning member 430 of the left X-axis positioning assembly 400 pushes the current sensor 300 into the right discharge port 130, as the measuring stage 200 moves from the first height to the second height, the elastic band 420 of the right X-axis positioning assembly 400 will drive the pusher 440 on the first end 421 of the elastic band 420 to move to the left. The moving pusher 440 will push the locking pin 433 on the positioning member 430 of the right X-axis positioning assembly 400 to move to the left, causing the locking pin 433 to move to the left. After the locking pin 433 is removed from the locking hole 435, the pusher 440 continues to apply a leftward force to the locking pin 433. Under this force, the pusher 440 finally pushes the folded part 432 of the positioning member 430 to flip away from the discharge port 130, thereby reducing the obstruction of the discharge port 130 by the positioning member 430, so that the positioning member 430 of the left X-axis positioning assembly 400 can smoothly push the current sensor 300 into the right discharge port 130.

[0042] It should be noted that when neither of the positioning members 430 of the two X-axis positioning assemblies 400 (i.e., the left X-axis positioning assembly 400 and the right X-axis positioning assembly 400) is locked by the locking mechanism 500, the pushers 440 on the elastic bands 420 of the two X-axis positioning assemblies 400 move approximately the same distance along the X-axis during the movement of the measuring stage 200 from the first height to the second height. The positioning members 430 will not contact the locking pin 433, nor will they push the locking pin 433 out of the locking hole 435, causing the folded portion 432 of the positioning member 430 to face away from the row. The direction of the feed port 130 is flipped; when the locking mechanism 500 locks the positioning member 430 of one of the X-axis positioning components 400, the pusher 440 on the elastic band 420 of the locked X-axis positioning component 400 will move a greater distance along the X-axis direction during the period when the measuring table 200 moves from the first height to the second height. At this time, the pusher 440 on the elastic band 420 of the X-axis positioning component 400 can push the locking pin 433 out of the locking hole 435 and cause the folded part 432 of the positioning member 430 to flip away from the discharge port 130.

[0043] like Figure 1 , Figure 2 and Figure 6As shown, in some embodiments, the locking mechanism 500 includes a limiting frame 510 and a rotation drive 520 for driving the limiting frame 510 to rotate. The limiting frame 510 has two first limiting portions 511 arranged opposite each other in the X-axis direction and two second limiting portions 512 arranged opposite each other in the Y-axis direction. The positioning members 430 of the two X-axis positioning assemblies 400 have first limiting engagement portions 436 that cooperate with the two first limiting portions 511. The positioning members 430 of the two Y-axis positioning assemblies 410 have second limiting engagement portions 437 that cooperate with the two second limiting portions 512. When the positioning member 430 of the X-axis positioning assembly 400 includes a fixed portion 431 and a folding portion 432, the first limiting engagement portion 436 is disposed on the fixed portion 431. Specifically, in this embodiment, the rotary drive component 520 that drives the limit frame 510 to rotate can be a motor or rotary cylinder fixedly installed on the machine tool 100. The limit frame 510 has a square frame structure, and the measuring table 200 is located inside the frame. This arrangement facilitates the placement and removal of the current sensor 300 on the measuring table 200. The two first limit parts 511 are the two sides on the left and right sides of the square frame, and the two second limit parts 512 are the two sides on the front and rear sides of the square frame. The first limit fitting part 436 is a protrusion that protrudes from the positioning member 430 of the X-axis positioning assembly 400 in the Z-axis direction. The second limit fitting part 437 is composed of two rods arranged on the left and right sides of the positioning member 430 of the Y-axis positioning assembly 410. One end of the rod is fixed to the positioning member 430 of the Y-axis positioning assembly 410, and the other end of the rod extends a certain distance in the X-axis direction and then bends towards the limit frame 510. Understandably, the limit frame 510 has three states under the drive of the rotary drive 520: a horizontal state, a rightward tilt state, and a leftward tilt state. When the limit frame 510 is in the horizontal state, it does not restrict the movement of the positioning members 430 of the four positioning components. The four positioning components can move synchronously toward the measuring stage 200. In this case, the four positioning components can be used to position the current sensor 300 to be measured on the measuring stage 200. When the limit frame 510 is tilted to the right, the first limit part 511 on the right side of the limit frame 510 will block the first limit mating part 436 of the positioning member 430 of the right X-axis positioning assembly 400, restricting the positioning member 430 of the right X-axis positioning assembly 400 from moving towards the measuring table 200. At the same time, the two second limit parts 512 on the limit frame 510 will also block the rods on the right side of the second limit mating parts 437 of the positioning members 430 of the two Y-axis positioning assemblies 410, restricting the positioning members 430 of the two Y-axis positioning assemblies 410 from moving towards the measuring table 200. In this case, the current sensor 300 detected on the measuring table 200 can be pushed into the right discharge port 130 by using the positioning member 430 of the left X-axis positioning assembly 400.When the limiting frame 510 is tilted to the left, the first limiting part 511 on the left side of the limiting frame 510 blocks the first limiting engagement part 436 of the positioning member 430 of the left X-axis positioning assembly 400, restricting the positioning member 430 of the left X-axis positioning assembly 400 from moving towards the measuring table 200. At the same time, the two second limiting parts 512 on the limiting frame 510 also block the second limiting engagement parts 437 of the positioning members 430 of the two Y-axis positioning assemblies 410, restricting the positioning members 430 of the two Y-axis positioning assemblies 410 from moving towards the measuring table 200. In this case, the positioning member 430 of the right X-axis positioning assembly 400 can be used to push the current sensor 300 detected on the measuring table 200 into the left discharge port 130. In other embodiments, the limiting frame 510 can also be a circular frame or an elliptical frame.

[0044] like Figure 6 As shown, in some embodiments, when the positioning member 430 of the X-axis positioning assembly 400 includes a fixed portion 431 and a folding portion 432, the limiting frame 510 also has a flipping limiting portion 513 for limiting the maximum flipping angle of the folding portion 432 of the positioning member 430. If the angle between the folding portion 432 and the fixed portion 431 is defined as 0° when the positioning member 430 of the X-axis positioning assembly 400 performs the positioning function, then the maximum flipping angle of the folding portion 432 of the positioning member 430 is limited to within 90°, thus ensuring that the folding portion 432 can return to its original angle under its own gravity after flipping. In other words, by setting the flipping limiting portion 513, the phenomenon that the folding portion 432 cannot automatically return to its original position after flipping can be avoided. Of course, the flipping limiting portion 513 is not necessary. Alternatively, a folding connecting component with a reset function can be used to connect the fixed portion 431 and the folding portion 432, such as a spring hinge.

[0045] like Figure 1 and Figure 2 As shown, in some embodiments, the machine 100 is provided with two storage boxes 600, which are respectively positioned corresponding to the two discharge ports 130. Current sensors 300 falling into the two discharge ports 130 can be collected by the two storage boxes 600 and subsequently transferred to other processes, such as transferring those with unacceptable appearances to a rework process and those with acceptable appearances to a packaging process. Alternatively, a conveyor belt can be provided below each of the two discharge ports 130 to transport the current sensors 300 after appearance sorting to other processes.

[0046] like Figure 4As shown, in some embodiments, a rolling element 438 is provided at the end of the positioning element 430 near the measuring stage 200 to reduce the friction between the positioning element 430 and the current sensor 300 under test. Compared with sliding contact, this can effectively reduce contact wear between the positioning element 430 and the current sensor 300 under test. In one embodiment, the rolling element 438 is a shaft that can roll along the Z-axis. In another embodiment, the rolling element 438 is a ball that can roll in any direction.

[0047] like Figure 1 and Figure 4 As shown, in some embodiments, a positioning seat 140 is fixedly mounted on the machine base 100, and a positioning shaft 439 is fixedly mounted on the positioning member 430. The positioning member 430 moves towards or away from the current sensor 300 under test through the positioning engagement between the positioning shaft 439 and the positioning seat 140. Specifically, in this example, the positioning member 430 is a rod-shaped structure, and the positioning member 430 is movably disposed through the positioning seat 140. It can be understood that for the X-axis positioning assembly 400, the positioning engagement between the positioning shaft 439 and the positioning seat 140 can limit the swing of the positioning member 430 in the Y-axis and Z-axis directions, so that the positioning member 430 of the X-axis positioning assembly 400 can move more stably along the X-axis direction. For the Y-axis positioning assembly 410, the positioning engagement between the positioning axis 439 and the positioning seat 140 can limit the swing of the positioning element 430 in the X-axis and Z-axis directions, so that the positioning element 430 of the Y-axis positioning assembly 410 can move more stably along the Y-axis direction.

[0048] like Figure 3 As shown, in some embodiments, the measuring stage 200 includes an upper stage 210 and a lower stage 220 arranged along the Z-axis, and a support frame 230 connecting the upper stage 210 and the lower stage 220. The image capturing device includes a first camera 700 and a second camera 710 arranged along the Z-axis. The upper stage 210 is made of a transparent or semi-transparent material, the first camera 700 and the second camera 710 are located on opposite sides of the upper stage 210, and the second camera 710 is mounted on the lower stage 220. Specifically, in this embodiment, the upper stage 210 can be transparent glass, and a ring-shaped supplementary light is provided around the outer periphery of both the first camera 700 and the second camera 710 to reduce interference from external light. With this configuration, the first camera 700 and the second camera 710 can respectively capture and detect the current sensor 300 on the measuring stage 200 from two different angles, allowing for comprehensive detection without flipping the sensor over.

[0049] like Figure 7As shown, in some embodiments, the lifting slot 120 is provided with a friction-reducing structure 150 corresponding to the position of the elastic band 420 of each positioning component. The friction-reducing structure 150 is a shaft that can roll along the Z-axis or a ball that can roll in any direction. The friction-reducing structure 150 can reduce the friction force between the elastic band 420 and the inner wall of the lifting slot 120, and extend the service life of the elastic band 420.

[0050] According to another aspect of the present invention, a method for detecting the appearance of a current sensor 300 using the above-described appearance visual inspection machine is provided, comprising the following steps:

[0051] S100: Position the measuring stage 200 at the first height position and place the current sensor 300 to be measured on the measuring stage 200;

[0052] S200: Manually adjust the position of the current sensor 300 to be measured, so that it is as close as possible to the position to be measured;

[0053] S300: Move the measuring stage 200 from the first height position to the second height position, and use the positioning component 430 of the four positioning components to accurately position the current sensor 300 to be measured to the position.

[0054] S400: Move the measuring platform 200 from the second height position back to the first height position;

[0055] S500: Uses an image acquisition device to photograph and detect the current sensor 300 on the measuring stage 200;

[0056] S600: Remove the current sensor 300 that has completed testing from the measuring stage 200 and replace it with the next current sensor 300 to be tested.

[0057] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A current sensor appearance visual inspection machine, characterized by, The utility model relates to a kind of current sensor appearance visual inspection machines, including: Machine table (100) with a mounting surface (110), the mounting surface (110) is equipped with lifting slot (120); Measuring table (200) for placing current sensor (300) to be measured, and it is movably arranged in the lifting slot (120) along the Z-axis direction perpendicular to the mounting surface (110), the measuring table (200) has first height and second height along the Z-axis direction; Image acquisition device is arranged opposite current sensor (300) to be measured on the measuring table (200); And Positioning device for positioning current sensor (300) to be measured on the measuring table (200) to be measured position, the positioning device includes four positioning components, the four positioning components are arranged around the measuring table (200), wherein each positioning component includes elastic band (420) and positioning piece (430), the first end (421) of the elastic band (420) is fixed to the measuring table (200), the second end (422) of the elastic band (420) is fixed to the mounting surface (110) of the machine table (100);The positioning piece (430) is fixed between the first end (421) and the second end (422) of the elastic band (420), and the positioning piece (430) can be moved towards current sensor (300) when the measuring table (200) moves from the first height to the second height; The four positioning components include two X-axis positioning components (400) arranged opposite along X-axis direction and two Y-axis positioning components (410) arranged opposite along Y-axis direction, the X-axis direction, the Y-axis direction and the Z-axis direction are perpendicular to each other, the machine table (100) is equipped with two material discharge ports (130) corresponding to the positions of the two X-axis positioning components (400) arranged along the X-axis direction;The current sensor (300) appearance visual inspection machine further includes locking mechanism (500), the locking mechanism (500) selectively locks the positioning piece (430) of the two Y-axis positioning components (410) and the positioning piece (430) in any one of the X-axis positioning components (400) on the machine table (100), to limit or allow the positioning piece (430) of the two Y-axis positioning components (410) relative to the machine table (100) along the Y-axis direction and the positioning piece (430) in the selected X-axis positioning component (400) relative to the machine table (100) along the X-axis direction moves; The positioning member (430) of the X-axis positioning assembly (400) comprises a fixed part (431) and a folding part (432), the fixed part (431) is fixed on the elastic belt (420), the locking mechanism (500) selectively locks the fixed part (431) of the positioning member (430) on the machine table (100), the folding part (432) is connected to the fixed part (431) on the side of the fixed part (431) facing the measuring table (200), the folding part (432) is elastically provided with a locking pin (433), and the fixed part (431) is provided with a locking hole (435) matched with the locking pin (433); each X-axis positioning assembly (400) further comprises a pushing member (440) fixed with the first end (421) of the elastic belt (420), in the X-axis positioning assembly (400) in which the positioning member (430) of the fixed part (431) is locked by the locking mechanism (500), the pushing member (440) can push the locking pin (433) out of the locking hole (435) when the measuring table (200) moves from the first height to the second height, and make the folding part (432) of the positioning member (430) turn over in the direction away from the discharge port (130).

2. The current sensor appearance visual inspection machine of claim 1, wherein: The locking mechanism (500) comprises a limiting frame (510) and a rotating driving member (520) for driving the limiting frame (510) to rotate, the limiting frame (510) has two first limiting parts (511) arranged opposite in the X-axis direction and two second limiting parts (512) arranged opposite in the Y-axis direction, the positioning member (430) of the two X-axis positioning assemblies (400) has a first limiting matching part (436) matched with the two first limiting parts (511), and the positioning member (430) of the two Y-axis positioning assemblies (410) has a second limiting matching part (437) matched with the two second limiting parts (512); when the positioning member (430) of the X-axis positioning assembly (400) comprises the fixed part (431) and the folding part (432), the first limiting matching part (436) is arranged on the fixed part (431).

3. The current sensor appearance visual inspection machine of claim 2, wherein: When the positioning member (430) of the X-axis positioning assembly (400) comprises the fixed part (431) and the folding part (432), the limiting frame (510) further has a turning limiting part (513) for limiting the maximum turning angle of the folding part (432) of the positioning member (430).

4. The current sensor appearance visual inspection machine of claim 1, wherein: The machine table (100) is provided with two storage boxes (600), and the two storage boxes (600) are arranged at positions corresponding to the two discharge ports (130) respectively.

5. The current sensor appearance visual inspection machine of claim 1, wherein: The positioning member (430) is provided with a rolling member (438) at one end close to the measuring table (200), so as to reduce the friction between the positioning member (430) and the current sensor (300) to be measured.

6. The current sensor appearance visual inspection machine of claim 1, wherein: The machine table (100) is fixedly provided with a positioning seat (140), the positioning member (430) is fixedly provided with a positioning shaft (439), and the positioning member (430) is moved towards or away from the current sensor (300) to be measured through positioning cooperation between the positioning shaft (439) and the positioning seat (140).

7. The current sensor appearance visual inspection machine of claim 1, wherein: The measuring table (200) comprises an upper table body (210) and a lower table body (220) arranged along the Z-axis direction and a support frame (230) connected between the upper table body (210) and the lower table body (220), and the image capturing device comprises a first camera (700) and a second camera (710) arranged along the Z-axis direction, wherein the upper table body (210) is made of transparent or translucent material, the first camera (700) and the second camera (710) are located on both sides of the upper table body (210), and the second camera (710) is mounted on the lower table body (220).

8. A method of detecting the appearance of a current sensor (300) using a current sensor appearance visual inspection machine as claimed in any one of claims 1 to 7, characterized in that, The method comprises the following steps: S100: the measuring table (200) is at a first height position, and the current sensor (300) to be measured is placed on the measuring table (200); S200: manually adjust the position of the current sensor (300) to be measured to be as close to the measured position as possible; S300: move the measuring table (200) from the first height position to the second height position, and use the positioning member (430) of the four positioning assemblies to accurately position the current sensor (300) to be measured to the measured position; S400: move the measuring table (200) from the second height position back to the first height position; S500: use the image capturing device to take a picture of the current sensor (300) on the measuring table (200); S600: remove the detected current sensor (300) from the measuring table (200) and replace it with another current sensor (300) to be measured.

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