CN117190965B - Radial surface defect detection device of auto-parts in shaft hole formula - Google Patents

Abstract

The invention relates to a radial surface defect detection device of an automobile part, which is characterized in that when in detection, air is slowly introduced into a detection disc to enable a plurality of contact lens groups to be in contact with the bottom of the automobile part, then the display surface of an analog module is provided with an edge profile corresponding to the part, the display condition of a signal origin in the edge profile is observed, when the corresponding contact lens group is electrified, the signal origin is changed, when the corresponding signal origin is not different from the signal origin on a standard picture, no obvious defect exists, when the difference exists between the corresponding signal origin and the signal origin, the defect exists, the automobile part with the defect can be removed according to the result, the automobile part with the defect on the end surface is effectively avoided, and the potential safety hazard is further reduced.

Description

A shaft hole type radial surface defect detection device for automobile parts

Technical field

The present invention relates to a defect detection device, in particular to a shaft hole type radial surface defect detection device of automobile parts applied in the field of defect detection of automobile parts.

Background technique

For some shaft hole auto parts, such as flanges, the flange is a part that is connected to the shaft and is used for the connection between the pipe ends; it is also used for the flange on the inlet and outlet of the equipment, used for two Connections between equipment, such as reducer flanges.

However, when there are local concave or local convex defects on the flange surface, after the flange is connected, it is easy to affect the sealing of the end face, which is not conducive to use and may easily cause safety hazards during the operation of the car. Therefore, the flange needs to be inspected for defects. It can only be used after it meets the standards before leaving the factory. In the existing technology, the inspection of flanges generally focuses on the hole shape, hole inner wall, etc., such as Chinese patent CN201922166094.0 "A device for inspecting the flatness of the shaft hole sealing contact surface of the gearbox body" 》, ignoring the defect detection on the flange surface.

Therefore, there is an urgent need to propose a defect detection device that can detect surface defects of shaft hole accessories.

Application content

In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the defect detection of the flange end face is missing or ignored in the prior art, which is not conducive to use.

In order to solve the above problems, the present invention provides a shaft hole type radial surface defect detection device for automobile parts, which includes a base plate. The upper end of the base plate is fixedly connected with a detection disk. The upper end of the base plate is also connected with a modification hole disk through an electric rotating shaft. The modification hole disk There are a plurality of matching holes distributed in an annular array drilled on the bottom plate. The ends of the modification plate and the detection plate that are close to each other are embedded and in contact with each other. The left and right upper ends of the bottom plate are fixedly connected to columns. The upper ends of the two columns are fixedly connected to the top plate. The top plate There are multiple jacks drilled on the top, and accessory positioning posts are inserted into the multiple jacks. There are push components on the front and rear sides of the contact point between the detection disk and the correction disk. The push components are fixedly connected to the base plate. On the base plate Drill a limited hole. The distance between the top view center of the limit hole and the center point of the modified hole disk is consistent with the distance between the center of the matching hole circle and the center of the modified hole disk. The limit hole is located at the center of the modified hole disk close to the detection disk. one side;

The pushing assembly includes a longitudinal column and a flat electric push rod connected to the vertical column through an electric slide rail. The upper end of the extension end of the flat electric push rod is fixedly connected with an L-shaped pressure rod, and the lower end of the top plate is fixedly connected with a longitudinal electric push rod. A rolling ball is movably connected to the bottom of the electric putter.

In the above-mentioned shaft-hole type radial surface defect detection device for automobile parts, through the cooperative arrangement of the detection disk and the simulation module, during detection, the end surface of the detection disk in contact with the automobile parts presents the signal origin on the display surface of the simulation module. When there is a difference between the corresponding signal origin and the signal origin display on the standard screen, it means there is a defect. The end face inspection of the shaft hole type auto parts is completed, which effectively prevents auto parts with end face defects from being put into use, thereby reducing safety hazards.

As a further improvement of the present application, the inner diameters of the multiple jack holes gradually increase in the direction from left to right, the inner diameters of the multiple matching holes are consistent with the multiple jack holes, and the inner diameter of the limiting holes is consistent with the maximum diameter of the matching holes. The inner diameter remains consistent.

As a further improvement of the present application, the base plate also includes a simulation module arranged on the computer. The simulation module is connected to the detection disk signal. The simulation module is used to simulate changes in the contact surface between multiple automobile parts and the detection disk.

As a further improvement of this application, the detection panel includes a shell, a partition slidingly connected to the inner wall of the shell, air control plates and air cushions located on the upper and lower sides of the partition respectively. The upper end of the shell is fixedly embedded with a porous hard plate, and the upper end of the air control plate There are multiple groups of evenly distributed contact groups connected to the porous hard plate. There are multiple through holes corresponding to the contact groups. The upper end of the contact group extends into the through hole. The simulation on the simulation module is expanded in proportion to the porous hard plate. Or a reduced display surface. The display surface has multiple signal origins connected to multiple contact group signals through C language programming.

As a further improvement of the present application, the end of the air cushion away from the modification hole plate is fixedly connected to an air expansion strip, and the outer end of the air expansion strip is fixedly connected to an inflatable tube. The air cushion has an elastic sealing structure, and the contact surface between the air expansion strip and the air cushion is not less than A plurality of air holes are provided in 1/3 of the outer section of the shell, and the inflatable tube is connected to the air expansion strip.

As a further improvement of the present application, the contact set includes an electric plate fixedly connected to the air control panel and two hard conductive strips electrically connected to the upper end of the electric plate. The upper ends of the two hard conductive strips are flush with each other.

A shaft-hole type radial surface defect detection device for auto parts. When detecting auto parts, the specific steps are as follows:

S1. Align one of the mounting holes on the shaft-hole type auto parts with the limit hole, and also align the matching hole corresponding to the inner diameter of the mounting hole on the modified hole plate with the limit hole, and select the corresponding accessory positioning post and insert it into into the mounting hole, and pass it through the mounting hole, matching hole and limit hole in sequence;

S2. Control the two push components and the longitudinal electric push rod to extend so that the longitudinal electric push rod, flat electric push rod and L-shaped pressure rod are all in contact with the upper surface of the auto parts. At this time, the simulation module gets the signal that the contact set is energized. Finally, an edge contour corresponding to the accessory is formed on the display surface;

S3. Slowly inflate the air cushion so that it expands and pushes the air control plate up so that multiple contact groups come into contact with the lower surface of the auto parts. Observe the simulated display surface in the simulation module on the computer screen. According to the edge contour of the display surface The changes in the origin of the internal signal can be used to initially determine the type of defects on the lower surface of the auto parts;

When there is no difference between the corresponding signal origin and the signal origin display on the standard screen, it means that there is no obvious defect. When the local signal origin changes first, it means that there is a local raised defect in the corresponding part. When there is a part where the signal origin never changes. , indicating that there is a local dent defect at the corresponding place,

S4. Control the other mounting hole on the auto parts to correspond to the limit, and repeat the above steps to complete the defect detection on the lower surface of the auto parts. Finally, change direction, and repeat the above steps to complete the defect detection on the other surface.

As a further improvement of this application, a step of reviewing the defect type can be added between step S3 and step S4, specifically: when the display surface is obviously different from the standard picture, control the two flat electric push rods respectively. Stretch, causing the auto parts to rotate back and forth slightly around the accessory positioning post. When it is observed that the areas different from the standard screen in step S3 move with the movement of the auto parts, it means that the defect type of the auto parts in step S3 does exist.

In summary, through the cooperative setting of the detection panel and the simulation module, during detection, air is slowly introduced into the detection panel to make multiple contact groups come into contact with the bottom of the auto parts, and then the display surface of the simulation module is displayed according to the accessories. Corresponding edge contour, and observe the display of the signal origin within the edge contour. When the corresponding contact group is energized, the signal origin changes. When there is no difference between the corresponding signal origin and the signal origin display on the standard screen, it means that there is no obvious defect. , when there is a difference between the two, it means there is a defect, and the defective auto parts can be eliminated based on the results, effectively preventing the auto parts with defective end faces from being put into use, thereby reducing safety hazards.

Description of the drawings

Figure 1 is a perspective view of the first embodiment of the present application;

Figure 2 is a perspective view of the first embodiment of the present application when inspecting shaft hole type auto parts;

Figure 3 is a top view of the first embodiment of the present application;

Figure 4 is a perspective view of the push assembly according to the first embodiment of the present application;

Figure 5 is a cross-sectional view of the detection disk according to the first embodiment of the present application;

Figure 6 is a top view of the air cushion according to the first embodiment of the present application;

Figure 7 is a partial schematic diagram of the air control panel according to the first embodiment of the present application;

Figure 8 is a comparison diagram between the standard picture formed on the simulation module and the defective picture in the first embodiment of the present application;

Figure 9 is a perspective view of the second embodiment of the present application;

Figure 10 is a comparison view between when there are defects on the end surface of the automobile parts and when there are no obvious defects in the second embodiment of the present application.

Explanation of numbers in the figure:

1 bottom plate, 2 detection plate, 21 shell, 22 air cushion, 23 air control panel, 24 porous hard plate, 201 air expansion strip, 202 inflatable tube, 3 modification hole plate, 301 matching hole, 41 column, 42 top plate, 6 accessory positioning Column, 7 push position components, 71 vertical column, 72 flat electric push rod, 73 L-shaped pressure rod, 8 vertical electric push rod, 91 electric plate, 92 hard conductive strip.

Detailed ways

Two embodiments of the present application will be described in detail below with reference to the accompanying drawings.

First implementation:

Figure 1-3 shows a shaft-hole type radial surface defect detection device for automobile parts, including a base plate 1. A detection disk 2 is fixedly connected to the upper end of the base plate 1. A correction hole disk 3 is also connected to the upper end of the base plate 1 through an electric rotating shaft. A plurality of matching holes 301 distributed in an annular array are drilled on the hole plate 3. The ends of the hole plate 3 and the detection plate 2 that are close to each other are embedded and in contact with each other. The left and right upper ends of the bottom plate 1 are fixedly connected with uprights 41, and the two uprights A top plate 42 is fixedly connected to the upper end of 41. A plurality of jack holes are drilled on the top plate 42, and accessory positioning posts 6 are inserted into the plurality of jack holes.

A limited hole is drilled on the bottom plate 1. The distance between the center point of the limited hole and the center point of the modification hole plate 3 is consistent with the distance between the center point of the matching hole 301 and the center point of the modification hole disk 3, and the limit hole is located in the modification hole. The center of disk 3 is close to one side of the detection disk 2, so that when the hole modification disk 3 is rotated, one of the matching holes 301 can be coaxial with the limit hole. When the mounting hole on the flange to be tested is also coaxial with the limit hole, At this time, the accessory positioning column 6 with the same size as the corresponding hole 301 is inserted into the axis center to achieve single-point positioning of the flange.

In addition, it is worth noting that the apertures of the multiple matching holes 301 correspond to the mounting holes on different types of flanges, so that when the end faces of flanges of different sizes are inspected, the mounting holes can correspond to the size of one of the matching holes 301. This At this time, the flange can be limited with the accessory positioning column 6 as the rotation axis through the corresponding accessory positioning column 6.

Pushing components 7 are provided on the front and rear sides of the contact point between the detection disk 2 and the hole modification disk 3. The pushing component 7 is fixedly connected to the base plate 1. The pushing component 7 includes a longitudinal column 71 and is connected to the longitudinal column 71 through an electric slide rail. There is a flat electric push rod 72 on the flat electric push rod 72. The upper end of the extension end of the flat electric push rod 72 is fixedly connected with an L-shaped pressure rod 73. The longitudinal and radial movement of the pushing assembly 7 can be realized through the slide rail and the flat electric push rod 72. The two can be in contact with the upper surface of the flange at the same time to achieve local positioning. The lower end of the top plate 42 is fixedly connected with a longitudinal electric push rod 8, and the bottom of the longitudinal electric push rod 8 is movably connected with a rolling ball. The vertical electric push rod 8 can be aligned longitudinally. At the same time, due to the setting of the ball at the bottom, the longitudinal electric push rod 8 is in rolling contact with the flange. When the flat electric push rod 72 is extended to push the flange, it will not easily affect the positioning column of the flange around the accessory. 6 Make a certain rotation.

It is worth noting that the lower end of the L-shaped pressure rod 73 can also be movably connected with a plurality of balls, so that the L-shaped pressure rod 73 and the flange are also rollingly connected.

The base plate 1 also includes a simulation module installed on the computer. The simulation module is connected to the detection panel 2 with signals. The simulation module is used to simulate changes in the contact surfaces between multiple flanges and the detection panel 2.

The detection panel 2 includes a shell 21, a partition slidingly connected to the inner wall of the shell 21, an air control plate 23 and an air cushion 22 respectively located on the upper and lower sides of the partition. The upper end of the shell 21 is fixedly inlaid with a porous hard plate 24, and the upper end of the air control plate 23 Multiple groups of evenly distributed contact groups are connected. A plurality of through holes corresponding to the contact groups are drilled on the porous hard plate 24. The upper end of the contact group extends into the through holes. It is worth noting that the upper end of the contact group does not protrude. The opening above the through hole prevents the contact set from contacting the bottom of the flange when the flange is placed on the detection panel 2 and the air cushion 22 is not inflated.

The simulation module simulates a display surface that is expanded or reduced in proportion to the porous hard plate 24. There are multiple signal origins on the display surface that are respectively connected to multiple contact groups. The distribution of the signal origins is related to the multiple signal origins. The distribution of the contact group remains consistent. When the air is inflated, the air control plate 23 moves upward, driving the contact group to contact the flange, causing the microcircuit in the contact group to conduct. When it is powered on, it can establish a signal with the analog module. The communication channel enables the corresponding signal origin on the analog module to change through color change or light and dark changes, etc., to simulate the energization of the corresponding contact group.

As shown in Figure 6, an air expansion bar 201 is fixedly connected to the end of the air cushion 22 away from the modification hole plate 3, and an inflation tube 202 is fixedly connected to the outer end of the air expansion bar 201. The air cushion 22 is an elastic sealing structure, and the air expansion bar 201 and the air cushion 22 are fixedly connected. The contact surface is not less than 1/3 of the outer cross section of the shell 21, and multiple air holes are provided between the two. The air tube 202 is connected to the air expansion strip 201. The air expansion strip 201 is arranged to allow air to enter the air cushion 22 from multiple directions, thereby making the air cushion 22 air inlet. Its expansion is relatively uniform and has a better lifting effect on the air control panel 23.

It is worth noting that the air cushion 22 and its related expansion strips 201 and inflatable tubes 202 can also be replaced by electric push rods, and the electric push rods can be directly used to control their rise.

As shown in Figure 7, the contact set includes an electric plate 91 fixedly connected to the air control panel 23 and two hard conductive strips 92 electrically connected to the upper end of the electric plate 91. The upper ends of the two hard conductive strips 92 are flush with each other, effectively Ensure that both can contact and conduct communication with the flange at the same time.

Among them, a wireless transmitting circuit is integrated in the electric board 91. When the ends of the two hard conductive strips 92 are connected, the wireless transmitting circuit can be connected, thereby establishing a signal transmission channel with the analog module, so that the analog module can receive Power-on signal realizes the change of corresponding signal origin after power-on.

A shaft hole type flange radial surface defect detection device. When testing the flange, the specific steps are as follows:

S1. Align one of the mounting holes on the shaft-hole type flange with the limit hole, and also align the matching hole 301 on the modified hole plate 3 corresponding to the inner diameter of the mounting hole with the limit hole, and select the corresponding accessory positioning post. 6 Insert it into the mounting hole, and pass it through the mounting hole, matching hole 301 and limit hole in sequence;

S2. Control the two push components 7 and the longitudinal electric push rod 8 to extend so that the longitudinal electric push rod 8, the flat electric push rod 72 and the L-shaped pressure rod 73 are all in contact with the upper surface of the flange. At this time, the simulation module is contacted. After receiving the power-on signal from the film set, an edge contour corresponding to the accessory is formed on the display surface;

S3. Slowly inflate the air cushion 22 so that it expands and pushes the air control plate 23 upward to make multiple contact groups contact the lower surface of the flange. Observe the simulated display surface of the simulation module on the computer screen. According to the display surface The change of the signal origin within the edge contour can be used to initially determine the type of defect on the lower surface of the flange;

As shown in Figure 8, a1 is the standard screen, that is, the screen on the display surface when there is no obvious abnormality. When there is no difference between the corresponding signal origin and the signal origin on the standard screen, it means that there is no obvious defect, as shown at c2 in Figure 8 , when the local signal origin changes first, it means that there is a local convex defect in the corresponding part, such as c1 in Figure 8. When there is a part where the signal origin never changes, it means that there is a local concave defect in the corresponding part;

S4. The other mounting hole on the control flange corresponds to the limit, and repeat the above steps to complete the defect detection on the lower surface of the flange. Finally, change direction, and repeat the above steps to complete the defect detection on the other surface.

Between step S3 and step S4, a step of reviewing the defect type can be added, specifically as follows: when the display surface is obviously different from the standard picture, control the two flat electric push rods 72 to extend respectively, so that the flange wraps around the The accessory positioning post 6 rotates back and forth slightly. When it is observed that the area different from the standard picture in step S3 moves with the movement of the flange, it means that the type of flange defect in step S3 does exist.

In summary, through the cooperative arrangement of the detection panel 2 and the simulation module, during detection, air is slowly introduced into the detection panel 2, so that multiple contact groups come into contact with the bottom of the flange, and then the display surface of the simulation module According to the corresponding edge contour of the accessory, and observe the display of the signal origin within the edge contour, when the corresponding contact group is powered on, the signal origin changes. If there is no difference between the corresponding signal origin and the signal origin display on the standard screen, it means there is no Obvious defects. When there is a difference between the two, it means there is a defect. The defective flange can be eliminated based on the result, effectively preventing the flange with defective end face from being put into use, thereby reducing safety hazards.

Second implementation:

In this embodiment, the detection disk 2 is only a hard flat structure, and its shape is the same as the first embodiment. However, the relevant structures of the detection disk 2 in the first embodiment include the outer shell 21, the air cushion 22, the air control The plate 23, the porous hard plate 24, the air expansion strip 201 and the air tube 202 are not provided in this embodiment.

Figure 9 shows that in this embodiment, when detecting the end face of the shaft-hole type flange, firstly, a layer of flour is evenly spread on the surface of the detection plate 2 through a fine mesh sieve, and then the corresponding holes on the hole modification plate 3 are 301 rotates to the limit hole, and then aligns one of the mounting holes of the flange with the matching hole 301 and places it on the detection plate 2. Position the flange through the accessory positioning post 6, and control the flat electric push rod 72 and L-shaped The pressure rod 73 and the longitudinal electric push rod 8 are both in contact with the upper surface of the flange, so that the flange is limited in the longitudinal and radial directions; at this time, the flat electric push rod 72 is alternately controlled to extend 1-3 times, and then the flange is removed. Next, observe the state of the flour on the surface of the detection plate 2, as shown in a2 in Figure 10. This is the state of the flour layer when there are no obvious defects on the flange surface. It is relatively uniformly compacted. When the part corresponding to the mounting hole is removed, as shown in b1 in Figure 10 , when there are other parts of flour in a relatively loose state, it means that there is a local depression at the flange corresponding to this part, such as at b2 in Figure 10. When the flour layer on the surface of the detection plate 2 forms obvious local scratches, it means that There is a local convex defect in the corresponding part of the flange.

In combination with the current actual needs, the protection scope of the above-mentioned embodiments adopted in this application is not limited thereto. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the concept of this application, and still fall within the scope of the present invention. protected range.

Claims (6)

1. A shaft hole type radial surface defect detection device for automobile parts, which is characterized in that: it includes a bottom plate (1), a detection disk (2) is fixedly connected to the upper end of the bottom plate (1), and the upper end of the bottom plate (1) A modification hole disk (3) is also connected through the electric rotating shaft. A plurality of matching holes (301) distributed in an annular array are drilled on the modification hole disk (3). The modification hole disk (3) and the detection disk (2 ) ends close to each other are embedded and in contact with each other. The left and right upper ends of the bottom plate (1) are fixedly connected with uprights (41). The upper ends of the two uprights (41) are fixedly connected with a top plate (42). The top plate (42) is drilled with a plurality of jacks, and accessory positioning posts (6) are inserted into the plurality of jacks. The front and rear sides of the contact point between the detection disk (2) and the hole modification disk (3) are both A push assembly (7) is provided, and the push assembly (7) is fixedly connected to the base plate (1). A limit hole is drilled on the base plate (1), and the center of the circle when viewed from above and the modification hole plate ( 3) The distance between the center points is consistent with the distance between the center of the matching hole (301) and the center of the modified hole plate (3), and the limit hole is located at the center of the modified hole plate (3) close to the detection plate (2). side; The push assembly (7) includes a longitudinal column (71) and a flat electric push rod (72) connected to the vertical column (71) through an electric slide rail. The upper end of the extended end of the flat electric push rod (72) An L-shaped pressure rod (73) is fixedly connected, a vertical electric push rod (8) is fixedly connected to the lower end of the top plate (42), and a rolling ball is movably connected to the bottom of the vertical electric push rod (8); The detection panel (2) includes a housing (21), a partition slidingly connected to the inner wall of the housing (21), air control panels (23) and air cushions (22) located on the upper and lower sides of the partition. The housing (21) ) The upper end surface is fixedly inlaid with a porous hard plate (24). The upper end of the air control plate (23) is connected to a plurality of evenly distributed contact groups. The porous hard plate (24) is drilled with a plurality of contact groups. Corresponding to the through hole, the upper end of the contact group extends into the through hole. The simulation module is simulated with a display surface that is expanded or reduced in proportion to the porous hard plate (24). The display surface has a plurality of holes programmed in C language. The signal origin is connected to multiple contact group signals respectively. The end of the air cushion (22) away from the modification hole plate (3) is fixedly connected to an air expansion strip (201), and the outer end of the air expansion strip (201) is fixedly connected. There is an inflatable tube (202), the air cushion (22) is an elastic sealing structure, and the contact surface between the air expansion strip (201) and the air cushion (22) is not less than 1/3 of the outer section of the shell (21), and the contact surface between the two A plurality of air holes are provided, and the inflation tube (202) is connected with the expansion strip (201). 2. A shaft-hole type radial surface defect detection device for automobile parts according to claim 1, characterized in that: the inner diameters of a plurality of said sockets gradually increase along the direction from left to right, and a plurality of said sockets gradually increase in diameter from left to right. The inner diameter of the matching hole (301) is consistent with the plurality of jack holes, and the inner diameter of the limiting hole is consistent with the maximum inner diameter of the matching hole (301). 3. A shaft-hole type radial surface defect detection device for automobile parts according to claim 1, characterized in that: the base plate (1) further includes a simulation module provided on a computer, and the simulation module is related to the detection device. The disc (2) is connected with signals, and the simulation module is used to simulate changes in the contact surface between multiple automobile accessories and the detection disc (2). 4. A shaft hole type radial surface defect detection device for automobile parts according to claim 1, characterized in that: the contact set includes an electric board (91) fixedly connected to the air control board (23) And two hard conductive strips (92) electrically connected to the upper end of the electric board (91), and the upper ends of the two hard conductive strips (92) are flush with each other. 5. A shaft hole type auto parts radial surface defect detection device according to claim 4, characterized in that: during detection, the specific steps are as follows: S1. Align one of the mounting holes on the shaft-hole type auto parts with the limit hole, and also align the matching hole (301) corresponding to the inner diameter of the mounting hole on the modification hole plate (3) with the limit hole, and Select the corresponding accessory positioning post (6) and insert it into the installation hole, and pass it through the installation hole, matching hole (301) and limit hole in sequence; S2. Control the two push components (7) and the longitudinal electric push rod (8) to extend, so that the longitudinal electric push rod (8), the flat electric push rod (72) and the L-shaped pressure rod (73) are in contact with the auto parts. The upper surface is in contact. At this time, after the analog module obtains the signal from the contact group to be energized, an edge contour corresponding to the accessory is formed on the display surface; S3. Slowly inflate the air cushion (22), causing it to expand and push the air control plate (23) upward, so that multiple contact groups come into contact with the lower surface of the auto parts. Observe the simulated display surface of the simulation module on the computer screen. Based on the changes in the signal origin within the edge contour of the display surface, initially determine the type of defects on the lower surface of the auto parts; S4. Control the other mounting hole on the auto parts to correspond to the limit, and repeat the above steps to complete the defect detection on the lower surface of the auto parts. Finally, change direction, and repeat the above steps to complete the defect detection on the other surface. 6. A shaft hole type auto parts radial surface defect detection device according to claim 5, characterized in that: between step S3 and step S4, a step of reviewing the defect type can be added, specifically: when the display After the situation on the screen is obviously different from the standard screen, control the extension of the two flat electric push rods (72) to make the auto parts rotate back and forth in a small amount around the accessory positioning post (6). When it is observed that the difference between the two in step S3 Different areas of the standard screen move with the movement of the auto parts, indicating that the defect types of the auto parts in step S3 do exist.