Automatic PCBA (Printed Circuit Board Assembly) board visual inspection equipment

Abstract

The utility model discloses an automatic PCBA board visual inspection device which comprises a base, the top of the base is fixedly connected with a fixing frame and a pair of guide rails respectively, and a first sliding block and a second sliding block are arranged between the pair of guide rails respectively. The tops of the first sliding block and the second sliding block are fixedly connected with a plurality of first positioning frames and a plurality of second positioning frames respectively, the tail ends of each first positioning frame and each second positioning frame are fixedly connected with supporting plates, the front end face of the fixing frame is fixedly connected with a plurality of connecting blocks, and the tail ends of the connecting blocks are fixedly connected with detection frames. A detection assembly is arranged on the detection frame, a dustproof plate is installed on the top of the fixing frame, and dustproof nets are installed on the two sides of the dustproof plate. The front and back surfaces of a plurality of PCBA boards can be detected in batches at the same time, the detection efficiency is high, the flexibility is good, the size of collected visual images can be adjusted according to needs, the detection camera adopts a detachable design, and rapid maintenance and replacement can be carried out when faults occur.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of PCBA board detection, especially relates to a kind of automatic PCBA board visual inspection equipment. BACKGROUND

[0002] PCBA board refers to the electronic components (such as resistor, capacitor, integrated circuit, etc.) installed on the PCB (Printed Circuit Board) blank board through welding or plug-in process, and after quality inspection and testing, the finished product circuit board. PCBA board is the core carrier of realizing circuit function in electronic products.

[0003] PCBA board visual inspection is a method of automatic quality detection of assembled circuit board through machine vision and artificial intelligence technology, and its core is to quickly identify the defects of component installation, welding, printing and other links through high-precision image acquisition and algorithm analysis. There are some visual inspection devices on the market, such as a PCBA board visual inspection device with publication number CN220289391U disclosed on China patent network. This visual inspection device can be used for the detection of PCBA board, but there are some defects and deficiencies to be improved: (1) some existing visual inspection devices can only detect single PCBA board due to structural design reasons, and it is difficult to detect multiple PCBA boards at the same time, so it is necessary to frequently replace the board, which is more cumbersome, not only reduces the overall detection efficiency, but also increases the workload of detection personnel; (2) although some existing visual inspection devices can detect the front and back of PCBA board at the same time, the flexibility is poor, it is difficult to adjust the detection height of detection camera, so that the detection device cannot collect the required visual image size; (3) most existing visual inspection devices are designed in an integrated manner, and the detection camera is fixed on the detection device and cannot be detached, so it is not convenient to repair and replace when it fails. Therefore, in view of the above problems, the utility model provides a kind of automatic PCBA board visual inspection equipment, which has important significance. UTILITY MODEL CONTENT

[0004] The utility model provides a kind of automated PCBA board visual inspection equipment, and multiple first positioning frame and the supporting plate on second positioning frame can support and fix multiple PCBA boards, when PCBA board is fixed, multiple upper detection camera and lower detection camera in detection assembly can simultaneously carry out batch detection to the front and back of multiple PCBA boards, without frequent replacement of plate piece, not only greatly improve the overall detection efficiency, also effectively reduce the workload of detection personnel;By driving electric telescopic rod, upper adjusting plate and lower adjusting plate can be driven to move up and down respectively, so that the distance between each upper detection camera and lower detection camera and PCBA board can be adjusted, so that the size of visual image obtained by collection can be adjusted as needed;By detachable design, each upper detection camera and lower detection camera can be detached from upper adjusting plate and lower adjusting plate, so that when upper detection camera and lower detection camera fail, they can be quickly repaired and replaced, and the problems in the background art are solved.

[0005] To solve the above technical problems, the utility model is realized by the following technical schemes:

[0006] The utility model discloses a kind of automated PCBA board visual inspection equipment, including base, the top of base is respectively fixedly connected with fixed frame and a pair of guide rails, a pair of the guide rail is located in the front side of fixed frame, and a pair of the guide rail is respectively provided with first slider and second slider between, the top of first slider and second slider is respectively fixedly connected with a plurality of first positioning frame and a plurality of second positioning frame, the end of each first positioning frame and each second positioning frame is fixedly connected with supporting plate, the front end surface of fixed frame is fixedly connected with a plurality of connecting blocks, the end of connecting block is fixedly connected with detection frame, the side of detection frame is C-shaped, and its top end and bottom end are located above and below each supporting plate respectively, and detection assembly is provided on the detection frame, dustproof plate is installed on the top of fixed frame, dustproof net is installed on the both sides of dustproof plate;

[0007] The detection assembly includes a pair of electric telescopic rods, a pair of the electric telescopic rods is respectively installed on the top and bottom of detection frame, and the output shaft end of a pair of the electric telescopic rods is respectively fixedly connected with upper adjusting plate and lower adjusting plate, the upper adjusting plate and lower adjusting plate are respectively located above and below each supporting plate, and a plurality of upper detection cameras and a plurality of lower detection cameras are respectively installed on the upper adjusting plate and lower adjusting plate.

[0008] Further, the side of the guide rail is L-shaped, the top surface is provided with a sliding groove, the sliding groove is rectangular, the first sliding block and the second sliding block are long strips, the length of the first sliding block and the second sliding block corresponds to the distance between the inner walls of the pair of guide rails, and the top of the two ends of the first sliding block and the second sliding block is fixedly connected with an adjusting rod, the diameter of the adjusting rod corresponds to the groove width of the sliding groove, the rod body of the adjusting rod is provided with external threads and is threadedly connected with a first nut matched therewith, and each adjusting rod penetrates through the corresponding sliding groove and extends above the guide rail.

[0009] Further, the first positioning frame and the second positioning frame are L-shaped, the number of the first positioning frame and the second positioning frame is the same, and the first positioning frame and the second positioning frame are linearly distributed at equal distances along the length direction of the first sliding block and the second sliding block respectively, and the center of each first positioning frame and the center of each second positioning frame correspond one by one.

[0010] Further, the top plate is L-shaped, and a layer of anti-skid pad is arranged on the top surface of the top plate, and the surface of the anti-skid pad is provided with anti-skid lines in the shape of a chevron.

[0011] Further, the number of the upper detection camera and the lower detection camera is the same as that of the top plate, and the upper detection camera and the lower detection camera are linearly distributed at equal distances along the length direction of the upper adjusting plate and the lower adjusting plate respectively, and the center of each upper detection camera and lower detection camera and the center of each top plate correspond one by one.

[0012] Further, the mounting seat is fixedly connected to the upper detection camera and the lower detection camera, mounting rods are fixedly connected to the four corners of the mounting seat, the rod body of the mounting rod is provided with external threads and is threadedly connected with a second nut matched therewith, a plurality of mounting holes are formed in the surface of the upper adjusting plate and the lower adjusting plate, the number of the mounting holes corresponds to the number of the mounting rods, the hole diameter of the mounting hole corresponds to the diameter of the mounting rod, and the center of each mounting hole and the center of each mounting rod correspond one by one.

[0013] Further, a plurality of positioning holes are formed in the dustproof plate, the dustproof nets are symmetrically distributed on the left and right sides of each positioning hole, a plurality of positioning columns are fixedly connected to the top of the fixing frame, the number of the positioning columns corresponds to the number of the positioning holes, the diameter of the positioning column corresponds to the hole diameter of the positioning hole, and the center of each positioning column and the center of each positioning hole correspond one by one.

[0014] The utility model discloses relative to prior art includes the following beneficial effects:

[0015] (1) The automatic PCBA board visual inspection equipment in the utility model can support and fix multiple PCBA boards through the supporting plates on the multiple first positioning frames and the multiple second positioning frames, can simultaneously perform batch detection on the front surface and the back surface of multiple PCBA boards through the multiple upper detection cameras and the multiple lower detection cameras in the detection assembly after the PCBA boards are fixed, and does not need to frequently replace the board pieces, so that the overall detection efficiency is greatly improved, and the workload of the detection personnel is effectively reduced;

[0016] (2) The automatic PCBA board visual inspection equipment in the utility model can drive the upper adjusting plate and the lower adjusting plate to move up and down through the driving electric telescopic rods, so that the distance between the multiple upper detection cameras and the multiple lower detection cameras and the PCBA board can be adjusted, and the size of the visual image collected can be adjusted according to the requirement;

[0017] (3) The automatic PCBA board visual inspection equipment in the utility model can be disassembled, and the multiple upper detection cameras and the multiple lower detection cameras can be disassembled from the upper adjusting plate and the lower adjusting plate, so that the multiple upper detection cameras and the multiple lower detection cameras can be quickly repaired and replaced when the multiple upper detection cameras and the multiple lower detection cameras are faulty.

[0018] Of course, any product implementing the utility model does not necessarily need to simultaneously achieve all the advantages described above. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for the ordinary skilled in the art, other drawings can also be obtained according to these drawings without paying creative labor.

[0020] Figure 1 It is a structural schematic view of the automatic PCBA board visual inspection equipment of the utility model;

[0021] Figure 2 It is a structural schematic view of the base and the fixing frame in the utility model;

[0022] Figure 3 It is a structural schematic view of the first sliding block and the second sliding block in the utility model;

[0023] Figure 4 It is a structural schematic view of the detection assembly in the utility model;

[0024] Figure 5 It is a structural schematic view of the upper adjusting plate and the lower adjusting plate in the utility model;

[0025] Figure 6The structure diagram of the dustproof plate is shown in the utility model.

[0026] In the drawings, the components represented by each reference numeral are listed as follows:

[0027] 1, base; 2, fixed frame; 3, guide rail; 4, first sliding block; 5, second sliding block; 6, first positioning frame; 7, second positioning frame; 8, supporting plate; 9, connecting block; 10, detection frame; 11, dustproof plate; 12, dustproof net; 13, electric telescopic rod; 14, upper adjusting plate; 15, lower adjusting plate; 16, upper detection camera; 17, lower detection camera; 18, sliding groove; 19, adjusting rod; 20, first nut; 21, non-slip pad; 22, mounting seat; 23, mounting rod; 24, second nut; 25, mounting hole; 26, positioning hole; 27, positioning column. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0029] In the description of the utility model, it should be understood that the terms "relative", "one end", "internal", "transverse", "end", "two ends", "two sides", "front", "one end surface", "the other end surface" and the like indicate the orientation or positional relationship, which are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated components or elements must have a specific orientation, be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation on the utility model.

[0030] Please refer to Figures 1-6As shown, the utility model discloses a kind of automated PCBA board visual inspection equipment, including base 1, the top of base 1 is respectively fixedly connected with fixed frame 2 and a pair of guide rail 3, a pair of guide rail 3 is located in the front side of fixed frame 2, and first slider 4 and second slider 5 are respectively arranged between a pair of guide rail 3, the top of first slider 4 and second slider 5 is respectively fixedly connected with several first positioning frame 6 and several second positioning frame 7, the end of each first positioning frame 6 and each second positioning frame 7 is fixedly connected with supporting plate 8, the both ends of PCBA board can be supported by supporting plate 8, the both ends of PCBA board can be respectively adhered to the side wall of corresponding supporting plate 8, now PCBA board can be clamped and fixed by supporting plate 8, the front end surface of fixed frame 2 is fixedly connected with several connecting blocks 9, the end of connecting block 9 is fixedly connected with detection frame 10, the side of detection frame 10 is C-shaped, and its top end and bottom end are located above and below each supporting plate 8 respectively, and detection assembly is arranged on detection frame 10, dustproof plate 11 is installed on the top of fixed frame 2, dustproof net 12 is installed on the both sides of dustproof plate 11, dustproof net 12 can be covered above the detection equipment to play the role of dust prevention, so that the accuracy of detection result can be effectively prevented from being affected by dust floating in air falling on PCBA board;

[0031] Detection assembly includes a pair of electric telescopic rods 13, a pair of electric telescopic rods 13 is respectively installed at the top and bottom of detection frame 10, and the output shaft end of a pair of electric telescopic rods 13 is respectively fixedly connected with upper adjusting plate 14 and lower adjusting plate 15, upper adjusting plate 14 and lower adjusting plate 15 are respectively located above and below each supporting plate 8, and upper adjusting plate 14 and lower adjusting plate 15 are respectively installed with several upper detection cameras 16 and several lower detection cameras 17, upper detection camera 16 and lower detection camera 17 are all industrial cameras that can be directly purchased on the market, and the output end of each upper detection camera 16 and lower detection camera 17 is externally connected with intelligent computer, the visual image of front and back of PCBA board can be captured by upper detection camera 16 and lower detection camera 17 respectively, and the image is output to externally connected intelligent computer, the collected visual image can be displayed and analyzed by intelligent computer, to quickly identify the defects of front and back components installation, welding, printing and other links of PCBA board, when detecting PCBA board on supporting plate 8, upper adjusting plate 14 and lower adjusting plate 15 can be driven to move up and down by driving electric telescopic rod 13, so as to adjust the distance between each upper detection camera 16 and lower detection camera 17 and PCBA board, so that the size of visual image collected can be adjusted as needed.

[0032] The side surface of the guide rail 3 is L-shaped, the top surface is provided with a sliding groove 18, the sliding groove 18 is rectangular, the first sliding block 4 and the second sliding block 5 are long strips, the length corresponds to the distance between the inner walls of a pair of guide rails 3, and the top of both ends of the first sliding block 4 and the second sliding block 5 is fixedly connected with an adjusting rod 19, the diameter of the adjusting rod 19 corresponds to the groove width of the sliding groove 18, the rod body is provided with external threads and is threadedly connected with a first nut 20 matched therewith, and each adjusting rod 19 respectively passes through the corresponding sliding groove 18 and extends above the guide rail 3, the first sliding block 4 and the second sliding block 5 can drive the adjusting rod 19 to move along the sliding groove 18 together with each first positioning frame 6 and second positioning frame 7, so as to adjust the distance of the supporting plate 8 according to the size of the PCBA board, so that the supporting plate 8 can support and fix the PCBA board of different sizes, and when the adjustment is completed, the first nut 20 on each adjusting rod 19 is tightened, and at this time the position of the first sliding block 4 and the second sliding block 5 can be fixed through the cooperation between the adjusting rod 19 and the first nut 20.

[0033] The first positioning frame 6 and the second positioning frame 7 are L-shaped, the number is the same, and are linearly distributed along the length direction of the first sliding block 4 and the second sliding block 5 respectively, and the center of each first positioning frame 6 and the center of each second positioning frame 7 are one-to-one corresponding, and the multiple first positioning frames 6 and second positioning frames 7 on the supporting plate 8 can support and fix multiple PCBA boards.

[0034] The supporting plate 8 is L-shaped, and a layer of anti-skid pad 21 is arranged on the top surface, the surface of the anti-skid pad 21 is provided with a chevron anti-skid pattern, the anti-skid pad 21 can be made of elastic materials such as rubber, and is fixed by means of glue, when the bottom surface and the side surface of the PCBA board are attached to the bottom surface and the side surface of the supporting plate 8, the anti-skid pad 21 can play a role in preventing abrasion, so as to avoid abrasion of the surface of the PCBA board, at the same time, the anti-skid pattern on the surface of the anti-skid pad 21 can increase the friction between the PCBA board and the supporting plate 8, so as to play a role in preventing slipping, so as to effectively prevent the PCBA board from slipping and displacement during detection.

[0035] The number of the upper detection camera 16 and the lower detection camera 17 is the same as that of the supporting plate 8, and is linearly distributed along the length direction of the upper adjusting plate 14 and the lower adjusting plate 15 respectively, and the center of each upper detection camera 16 and lower detection camera 17 corresponds to the center of each supporting plate 8 one-to-one, and each upper detection camera 16 and lower detection camera 17 can be aligned with the PCBA board on each supporting plate 8, so that multiple PCBA boards can be batch detected by multiple upper detection cameras 16 and lower detection cameras 17 at the same time, without frequent replacement of the board, which not only greatly improves the overall detection efficiency, but also effectively reduces the workload of the detection personnel.

[0036] The upper detection camera 16 and the lower detection camera 17 are fixedly connected with the mounting seat 22, the mounting seat 22 is fixedly connected with the mounting rod 23 at four corners, the rod body of the mounting rod 23 is provided with external threads and is threadedly connected with the second nut 24 matched therewith, the surface of the upper adjusting plate 14 and the lower adjusting plate 15 is provided with a plurality of mounting holes 25, the number of the mounting holes 25 is same as that of the mounting rod 23, the hole diameter of the mounting hole 25 is equal to that of the mounting rod 23, and the center of each mounting hole 25 and the center of each mounting rod 23 are one-to-one corresponding, the mounting rod 23 on the mounting seat 22 can be aligned and passes through the corresponding mounting hole 25, at this time, the second nut 24 is threadedly connected on each mounting rod 23 and is tightened, the mounting seat 22 can be fixedly installed on the upper adjusting plate 14 and the lower adjusting plate 15 through the cooperation among the mounting rod 23, the mounting hole 25 and the second nut 24, when the upper detection camera 16 and the lower detection camera 17 are faulty, the mounting seat 22 can be disassembled from the upper adjusting plate 14 and the lower adjusting plate 15 by unscrewing the second nut 24, so that the faulty upper detection camera 16 and lower detection camera 17 can be quickly repaired and replaced.

[0037] The dustproof plate 11 is provided with a plurality of positioning holes 26, the dust screen 12 is symmetrically distributed on the left and right sides of each positioning hole 26, the top of the fixing frame 2 is fixedly connected with a plurality of positioning columns 27, the number of the positioning columns 27 is same as that of the positioning holes 26, the diameter of the positioning column 27 is equal to that of the positioning hole 26, and the center of each positioning column 27 and the center of each positioning hole 26 are one-to-one corresponding, when the dustproof plate 11 is placed on the top of the fixing frame 2, each positioning column 27 can be aligned and passes through the corresponding positioning hole 26, at this time, the dustproof plate 11 can be positioned and fixed through the cooperation between the positioning column 27 and the positioning hole 26, so that the dust screen 12 can cover the top of each PCBA plate, and the dustproof plate 11 can be taken off from the fixing frame 2 after long time use, so that the dust screen 12 can be regularly cleaned.

[0038] The circuit, electronic components and chip modules involved in the utility model are all prior art, and can be realized by those skilled in the art without further description, and the content protected by the utility model does not involve improvement of software and methods.

[0039] The standard parts used in the application file can be purchased from the market, all the components in the application file can be ordered according to the description and drawings, the specific connection mode of each part adopts the conventional means such as bolt, rivet and welding in the prior art, and the mechanical parts and equipment adopt the conventional type in the prior art, the electrical components appearing in the text are electrically connected with the main controller and power supply, and the main controller is a conventional known device that can play a control role.

[0040] The working principle of the utility model is:

[0041] The utility model discloses in using, can place the both ends of PCBA board on the supporting plate 8, then remove first sliding block 4 and second sliding block 5 make it drive adjusting rod 19 together with each first positioning frame 6 and second positioning frame 7 along with the movement of the sliding slot 18, until the both ends of PCBA board respectively adhere to the side wall of supporting plate 8, in order to support and clamping fixed through supporting plate 8 to PCBA board, through the supporting and fixed of multiple first positioning frame 6 and second positioning frame 7 on supporting plate 8 can support and fix multiple PCBA board, when PCBA board completes fixed, through the detection camera 16 and the detection camera 17 on the detection frame 10 can capture the visual image of PCBA board front and back respectively, and the image is exported to the external smart computer, through the smart computer can display and analyze the visual image of collection, to quickly identify PCBA board front and back component installation, welding, printing etc. The defect of link, each detection camera 16 and detection camera 17 can be aligned respectively on each supporting plate 8 PCBA board, so that multiple detection camera 16 and detection camera 17 can simultaneously detect multiple PCBA board in batches, without frequent replacement of the board, not only greatly improve the overall detection efficiency, also effectively reduce the workload of detection personnel, when detecting PCBA board on supporting plate 8, through the drive electric telescopic rod 13 can drive upper adjusting plate 14 and lower adjusting plate 15 to move up and down respectively, in order to adjust the distance between each detection camera 16 and detection camera 17 and PCBA board, so that the size of the visual image obtained by collection can be adjusted according to the need, when detection camera 16 and detection camera 17 break down, by unscrewing second nut 24 can remove mounting seat 22 from upper adjusting plate 14 and lower adjusting plate 15, in order to quickly overhaul and replace the detection camera 16 and detection camera 17 of fault.

[0042] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details, and the utility model is not limited to the specific implementation described. Obviously, according to the content of the specification, many modifications and changes can be made. The specification selects and describes these embodiments in order to better explain the principles and practical applications of the utility model, so that the skilled in the art can well understand and use the utility model. The utility model is limited by the claims and the whole scope and equivalents.

Claims

1. An automated PCBA board visual inspection device, characterized in that, The device includes a base, on the top of which a fixed frame and a pair of guide rails are fixedly connected. The pair of guide rails are located on the front side of the fixed frame, and a first slider and a second slider are respectively arranged between the pair of guide rails. Several first positioning frames and several second positioning frames are fixedly connected to the top of the first slider and the second slider, respectively. A support plate is fixedly connected to the end of each first positioning frame and each second positioning frame. Several connecting blocks are fixedly connected to the front end of the fixed frame, and a detection frame is fixedly connected to the end of each connecting block. The side of the detection frame is C-shaped, with its top and bottom ends located above and below each support plate, respectively. A detection component is provided on the detection frame. A dustproof plate is installed on the top of the fixed frame, and dustproof nets are installed on both sides of the dustproof plate. The detection assembly includes a pair of electrically operated telescopic rods, which are respectively installed at the top and bottom of the detection frame. The output shaft ends of the pair of electrically operated telescopic rods are respectively fixedly connected to an upper adjustment plate and a lower adjustment plate. The upper adjustment plate and the lower adjustment plate are respectively located above and below each support plate. Several upper detection cameras and several lower detection cameras are respectively installed on the upper adjustment plate and the lower adjustment plate.

2. The automated PCBA board visual inspection equipment according to claim 1, characterized in that, The guide rail has an L-shaped side and a rectangular groove on its top surface. The first and second sliders are elongated, and their lengths are equal to the distance between the inner walls of the pair of guide rails. Adjusting rods are fixedly connected to the top of both ends of the first and second sliders. The diameter of the adjusting rods is equal to the width of the groove. The rods are threaded with external threads and threaded with a first nut that matches them. Each adjusting rod passes through the corresponding groove and extends to the top of the guide rail.

3. The automated PCBA board visual inspection equipment according to claim 1, characterized in that, Both the first positioning frame and the second positioning frame are L-shaped, and the number of them is the same. They are distributed linearly at equal intervals along the length direction of the first slider and the second slider, respectively, and the center of each first positioning frame corresponds one-to-one with the center of each second positioning frame.

4. The automated PCBA board visual inspection equipment according to claim 1, characterized in that, The tray is L-shaped, and its top surface is provided with an anti-slip pad, the surface of which is provided with herringbone anti-slip texture.

5. The automated PCBA board visual inspection equipment according to claim 1, characterized in that, The number of upper and lower detection cameras is the same as that of the tray, and they are equidistantly linearly distributed along the length of the upper and lower adjustment plates, respectively. The center of each upper and lower detection camera corresponds one-to-one with the center of each tray.

6. The automated PCBA board visual inspection equipment according to claim 1, characterized in that, Both the upper and lower detection cameras are fixedly connected to mounting bases. Mounting rods are fixedly connected to the four corners of each mounting base. The mounting rods have external threads and are threaded to a second nut that mates with them. The surfaces of the upper and lower adjustment plates are each provided with a number of mounting holes. The number of mounting holes is the same as the number of mounting rods, and the diameter of the holes corresponds to the diameter of the mounting rods. The center of each mounting hole corresponds one-to-one with the center of each mounting rod.

7. The automated PCBA board visual inspection equipment according to claim 1, characterized in that, The dustproof plate has several positioning holes, and the dustproof net is symmetrically distributed on the left and right sides of each positioning hole. The top of the fixing frame is fixedly connected with several positioning posts. The number of positioning posts is the same as the number of positioning holes, and their diameter is equal to the diameter of the positioning holes. The center of each positioning post corresponds one-to-one with the center of each positioning hole.

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