An automatic quality inspection and sorting production line and method for a detection head

Abstract

The application discloses a kind of detection head automatic quality inspection sorting production lines, including vibration conveying system, detection workbench, gauge detection platform and workpiece positioning system, discharge classification system;Gauge detection platform includes rack, linear module, gauge assembly and needle gauge back detection component, gauge assembly includes detection needle gauge, workpiece positioning system includes positioning lower support, positioning upper support, jacking cylinder, discharge classification system includes unqualified conveying channel, qualified conveying channel, horizontal push cylinder and drive assembly, also discloses a kind of detection head automatic quality inspection sorting method, comprising the following steps: S1, build detection head automatic quality inspection sorting production line;S2, as the detection needle gauge of rule, set minimum allowable pressure value, and qualified detection is carried out to workpiece;S3, as the detection needle gauge of stop rule, set maximum allowable pressure value, and qualified detection is carried out to workpiece;The application has full-process automation, screening precision is high, standard is unified, saves artificial characteristics such as labor.

Description

Technical Field

[0001] This invention relates to the field of quality inspection gauge technology, specifically to an automatic quality inspection and sorting production line and method for inspection heads. Background Technology

[0002] In the field of precision testing and gauge calibration, the geometric accuracy of the testing head (such as the contact probe assembly used in coordinate measuring equipment) directly determines the reliability of the measurement results. Currently, most testing heads on the market are made of ruby ​​material, with an overall cylindrical structure and a through hole running vertically through the center along the axial direction; this through hole has a constricted section at the middle position along the axial direction, that is, the inner diameter narrows at this point.

[0003] When performing factory inspection or inter-process inspection on the above-mentioned inspection head, the workpiece is transported to the platform, and then the operator holds the inspection needle gauge (or standard measuring needle) and inserts it into the through hole from top to bottom. The needle gauge is then pushed through the constriction section by a force within a preset range. Only then can it be determined whether the hole diameter and shape and position of the workpiece are in compliance with the requirements.

[0004] However, the existing testing methods have significant shortcomings: The lack of both positioning and automatic sorting systems for the tooling makes it easy for workpieces to be misaligned when inserted into the gauge pins, hindering testing and requiring manual sorting. Furthermore, the force applied by the gauge pins through the through-holes relies entirely on the operator's subjective judgment based on feel and experience, lacking a unified and reproducible standard. Fluctuations in force applied by different personnel, and even by the same person at different times, lead to poor consistency and low repeatability of test results, easily resulting in misclassifying qualified products as unqualified or vice versa. Simultaneously, relying solely on experience requires high skill levels and lengthy training periods, is inefficient in large-scale testing scenarios, and makes data traceability and quality control during the testing process difficult. Summary of the Invention

[0005] The present invention aims to provide an automated quality inspection and sorting production line and method for inspection heads, which objectively and quantitatively determines the through-hole performance of inspection heads, reduces reliance on human experience, and solves the problem that the current lack of fully automated standard inspection production lines for inspection heads leads to a reliance on the experience and feel of workers to judge whether the inspection is qualified, resulting in time-consuming and labor-intensive manual sorting and screening.

[0006] Therefore, the technical solution adopted by this invention is as follows: an automatic quality inspection and sorting production line for inspection heads, comprising a vibration conveying system, an inspection workbench, two gauge inspection platforms installed on the inspection workbench at left and right intervals, and a workpiece positioning system and a material sorting system both installed on the gauge inspection platforms; the gauge inspection platform includes a frame, a linear module vertically installed on the frame, a gauge assembly installed on the lifting seat of the linear module, and a needle gauge return detection assembly installed on the frame, the gauge assembly including inspection needle gauges, the inspection needle gauges on the two gauge inspection platforms having different sizes, and respectively corresponding to the upper tolerance limit of the workpiece hole diameter as a stop gauge and the lower tolerance limit of the hole diameter as a stop gauge. The workpiece positioning system includes a lower positioning support, an upper positioning support, and a lifting cylinder. The lower and upper positioning supports are jointly provided with a feeding channel and a lifting channel through which the extension and retraction end of the lifting cylinder passes. When the workpiece enters the lifting channel from the feeding channel, the lifting cylinder lifts the workpiece to be flush with the upper surface of the center area of ​​the upper positioning support. The discharge classification system includes a non-conforming conveying channel, a conforming conveying channel, a rotatable horizontal pushing cylinder, and a drive assembly for driving the horizontal pushing cylinder to rotate. After the workpiece is detected by the gauge assembly, the angle of the horizontal pushing cylinder is rotated according to the detection result, thereby aligning and pushing the workpiece into the non-conforming conveying channel or the conforming conveying channel.

[0007] As a preferred embodiment of the above solution, the drive assembly includes a driving gear, a driven gear disk, and a drive motor. The driven gear disk and drive motor are mounted on the frame via a classification mounting plate. The drive motor is mounted below the classification mounting plate, and its rotating end passes through the classification mounting plate and connects to the driving gear. The driven gear disk is rotatably mounted above the classification mounting plate via bearings. A rack that meshes with the driving gear is provided on the side of the arc-shaped outer periphery of the driven gear adjacent to the driving gear. The horizontal push cylinder is mounted on the driven gear disk via a cylinder mounting plate. A push support plate is provided at the telescopic end of the horizontal push cylinder facing the workpiece. The outer end of the push support plate has an arc surface that matches the contour of the workpiece contact surface. Considering the small size of the workpiece, the extension end face of the push support plate matches the contour of the workpiece contact surface. This reduces the resistance to pushing the workpiece, resulting in a reasonable structural design.

[0008] More preferably, the lower positioning support and the lifting cylinder are respectively installed on the upper and lower sides of the bottom horizontal support of the frame. The bottom horizontal support of the frame is provided with a through hole for the extension and retraction end of the lifting cylinder to pass through. The upper positioning support includes a left support and a right support. The top center of the lower positioning support is provided with a circular groove. The lower part of the left support matches the size of the circular groove at the center of the lower positioning support, ensuring that the left support is accurately installed on the lower positioning support and is installed firmly.

[0009] The left support and the lower positioning support are provided with grooves with consistent orientation and size, and together with the right support, they form a feeding channel. The structure is reasonably designed, and the feeding channel is located below the right support, leaving enough space for the lifting channel to be lifted.

[0010] The top of the left support is provided with guide grooves that run in the same direction to the unqualified conveying channel and the qualified conveying channel. A limit baffle is bolted on the upper support of the positioning. The limit baffle is provided with a through hole for the gauge assembly to pass through for inspection corresponding to the center hole of the workpiece. The limit baffle is used to restrict the up and down movement of the workpiece, effectively preventing the gauge assembly from jamming the workpiece and causing the workpiece to rise synchronously during the return.

[0011] More preferably, the vibratory conveying system includes a conveying worktable and vibratory conveying discs and workpiece conveying troughs both mounted on the conveying worktable; the workpiece conveying trough is connected to the feeding channel on the right gauge inspection platform, and the qualified conveying channel on the right gauge inspection platform is connected to the feeding channel on the left gauge inspection platform. Both the workpiece conveying trough and the qualified conveying channel on the right gauge inspection platform are equipped with linear vibrators. The unqualified conveying channel includes two types: definitely unqualified and critical value unqualified. The outlets of the unqualified conveying channel and the qualified conveying channel on the left gauge inspection platform are equipped with material placement boxes, which classifies the unqualified workpieces into two types. Subsequently, workpieces that are critical value unqualified can be re-inspected, reducing the workpiece rejection rate and avoiding accidental damage to qualified workpieces.

[0012] More preferably, the gauge assembly further includes a movable inner gauge cylinder, a movable outer gauge cylinder, and a pressure sensor. The detection needle gauge is mounted on the lower end of the movable inner gauge cylinder via a clamp assembly. A transfer stop is installed at the top port of the movable inner gauge cylinder. A spring providing preload is installed between the detection needle gauge and the transfer stop, thereby achieving elastic mounting of the detection needle gauge. The lower part of the movable outer gauge cylinder is fitted onto the upper part of the movable inner gauge cylinder. A pressure sensor is installed inside the movable outer gauge cylinder above the transfer stop. When the detection needle gauge moves down to enter the detection head under the drive of the linear module, the thrust of the detection needle gauge is detected by the pressure sensor.

[0013] The resistance encountered when the test needle gauge passes through the through hole, which is the thrust of the test needle gauge, is detected by a pressure sensor. When the detected pressure exceeds the maximum or minimum acceptable limit, the test head can be directly judged as unqualified.

[0014] A further preferred embodiment is that the pressure sensor is equipped with a sensor protection block at the top. The bottom end of the sensor protection block extends into the movable outer cylinder of the gauge and is connected to the pressure sensor. The top expands to form a counterweight block that rests on the movable outer cylinder of the gauge. When the pressure on the detection needle gauge exceeds the weight of the sensor protection block, the sensor protection block is lifted up so that it is no longer resting on the movable outer cylinder of the gauge, thereby ensuring that the pressure sensor is only affected by the gravity of the sensor protection block. The sensor protection block weighs 1 kg, and overload protection for the pressure sensor is added to avoid damage to the sensor due to exceeding the measurement range. The design is reasonable.

[0015] The pressure sensor is a miniature pressure sensor, and the bottom rear end of the frame is mounted on the testing workbench via two support cylinders spaced apart on the left and right, ensuring a stable installation.

[0016] More preferably, the chuck assembly includes a micro-diameter chuck for holding the test needle gauge and an elastic collet chuck for holding the micro-diameter chuck. The lower part of the movable inner cylinder of the gauge is partially flattened to expose the vertical bar opening. The micro-diameter chuck is used for axial movement of the test needle gauge, and a spring contact block is placed on top for the bottom end of the spring to abut against. The test needle gauge passes through the micro-diameter chuck and connects to the spring contact block. The spring contact block has a needle gauge return detection bar extending out of the vertical bar opening. In the initial state, the needle gauge return detection bar is located at the bottom end of the vertical bar opening. When the test needle gauge is lifted by force, the spring contact block pushes the spring to compress, and at the same time, the needle gauge return detection bar moves upward along the vertical bar opening. Thus, the return length of the test needle gauge can be indirectly known from the upward movement dimension of the needle gauge return detection bar.

[0017] The needle gauge return detection assembly includes a laser emitter and a laser receiver mounted on the left and right sides of the frame. The laser receiver is equipped with a vertical length scale. When the gauge assembly descends to the designed position for workpiece inspection, the detection needle gauge is pressed back up. The needle gauge return detection strip moves upward from the bottom end of the vertical strip opening at the bottom of the movable inner cylinder of the gauge. The laser screen emitted by the laser emitter can be partially blocked by the needle gauge return detection strip. Thus, the return length of the detection needle gauge can be obtained through the scale corresponding to the laser gap on the laser receiver. Combining the movable length of the linear module lifting seat with the return length of the detection needle gauge gives the total moving length of the detection needle gauge, which can promptly reflect the movement trajectory and force condition of the detection needle gauge.

[0018] A further preferred embodiment is that the upper part of the movable outer cylinder of the gauge is provided with an outer cylinder mounting plate that is threadedly connected to the lifting seat of the linear module, and the lower part is provided with a vertical notch. The length of the vertical notch is greater than the length of the overlap with the movable inner cylinder of the gauge, thereby leaving space for the pressure sensor wiring harness to pass through. The part of the upper end of the vertical notch that does not overlap with the movable inner cylinder of the gauge is used for the pressure sensor wiring harness to pass through, which is a reasonable structural design.

[0019] The vertical notch corresponds to the overlapping area of ​​the movable inner cylinder of the gauge, and two adjustment support plates are provided on both sides. The two adjustment support plates are connected by horizontal adjustment screws that are spaced apart vertically. When the horizontal adjustment screws are tightened, the inner diameter of the movable outer cylinder of the gauge is tightened and fixed to the movable inner cylinder of the gauge, ensuring a stable installation. The bottom thread of the movable inner cylinder of the gauge is equipped with a mounting cap. The mounting cap has a through hole in the center, and the inner wall of the through hole has an inclined surface that fits with the lower part of the elastic collet, thereby fixing the elastic collet and allowing the elastic collet to tighten and clamp the micro-diameter collet. However, when it is necessary to replace the test needle gauge, simply unscrew the mounting cap, and the elastic collet will drop and release the micro-diameter collet, making it easy to pull out the test needle gauge for flexible replacement. The inner wall of the movable inner cylinder of the gauge has a conical surface that fits with the upper part of the elastic collet, making it easy for the elastic collet to tighten along the conical surface. The structural design is reasonable.

[0020] More preferably, the sensor protection block and the pressure sensor are connected by an inverted "T"-shaped sensor mounting block. The bottom of the sensor protection block is provided with a through hole for the upper part of the inverted "T"-shaped sensor mounting block to be inserted, and the inverted "T"-shaped sensor mounting block is installed by a horizontal pin. The bottom frustum of the inverted "T"-shaped sensor mounting block is threadedly connected to the pressure sensor, and the structural connection is stable.

[0021] This solution also employs an automatic quality inspection and sorting method using a detection head, including the following steps:

[0022] S1. Construct the above-mentioned automated quality inspection and sorting production line for the detection head;

[0023] S2. Set the pressure applied to the workpiece by the inspection needle gauge (used as a go gauge) to the minimum allowable pressure value, and perform a qualification test on the workpiece; if the workpiece can pass smoothly under the minimum allowable pressure value, it is judged as qualified; if the workpiece is within the critical threshold range or obviously cannot pass, it is judged as unqualified.

[0024] S3. Set the pressure applied to the workpiece by the inspection needle gauge (used as a stop gauge) to the maximum permissible pressure value, and perform a qualification test on the workpiece; if the workpiece obviously cannot pass under the maximum permissible pressure value, it is judged as qualified; if the workpiece is within the critical threshold range or can pass smoothly, it is judged as unqualified.

[0025] Steps S2 and S3 are not in any particular order.

[0026] The beneficial effects of this invention are:

[0027] (1) Compared with the current method where the operator holds the inspection needle gauge and inserts it into the inspection head from top to bottom, relying entirely on the operator's feel and experience for subjective control, this solution uses two gauge inspection platforms with different sizes of inspection needle gauges on the two gauge inspection platforms. One inspection needle gauge corresponds to the upper tolerance limit of the workpiece hole diameter as a no-go gauge. When inserted into the workpiece hole, the qualified workpiece hole diameter cannot be larger than the no-go gauge size. The other inspection needle gauge corresponds to the lower tolerance limit of the workpiece hole diameter as a go gauge. When inserted into the workpiece hole, the qualified workpiece hole diameter cannot be smaller than the go gauge size. Thus, the inner hole diameter of the workpiece is screened for size compliance. The whole process is automated, with high screening accuracy and unified standards.

[0028] (2) The lower positioning support and the upper positioning support are both reserved with a feeding channel and a lifting channel for the extension and retraction end of the lifting cylinder to pass through. The workpiece enters the lifting channel along the feeding channel, and then the lifting cylinder lifts the workpiece to be flush with the upper surface of the center area of ​​the upper positioning support. The center area of ​​the upper positioning support is not affected by the squeezing of other workpieces in the circumferential direction as the detection point. Therefore, it will not cause the workpiece center to be mismatched with the detection needle gauge center. Therefore, the workpiece that was originally affected by other workpieces is sent out through the lifting channel. The structure is interlocked.

[0029] (3) After the workpiece is inspected, the unqualified conveying channel and the qualified conveying channel are divided. According to the inspection results, the horizontal push cylinder is rotated to the corresponding angle, and then the workpiece is pushed into the unqualified conveying channel or the qualified conveying channel, thereby realizing the automatic screening and classification of the workpiece, effectively saving manpower and reducing labor costs.

[0030] (4) For workpieces with high precision requirements, it is not only necessary to consider whether they can pass or not, but also to consider how much force is needed to pass or not to be considered qualified. Therefore, the pressure value applied to the workpiece by the inspection needle gauge as a go gauge is set to the minimum allowable pressure value, and the workpiece is tested for qualification or non-qualification. The pressure value applied to the workpiece by the inspection needle gauge as a no-go gauge is set to the maximum allowable pressure value, and the workpiece is tested for qualification or non-qualification.

[0031] This invention features full-process automation, high screening accuracy, standardized processes, effective labor saving, and reduced labor costs. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of the present invention.

[0033] Figure 2 This is a schematic diagram of the gauge inspection platform.

[0034] Figure 3 Bit Figure 2 A magnified view of a portion of point A in the middle.

[0035] Figure 4This is a side sectional view of the gauge inspection platform.

[0036] Figure 5 This is a front sectional view of the gauge assembly.

[0037] Figure 6 This is a schematic diagram of the workpiece positioning system and the material sorting system.

[0038] Figure 7 This is a front sectional view of the workpiece positioning system.

[0039] Figure 8 A cross-sectional view of the workpiece positioning system from another perspective, without the limit baffle installed.

[0040] Figure 9 This is a schematic diagram of the workpiece positioning system.

[0041] Figure 10 A schematic diagram of a horizontally driven cylinder pushing a workpiece. Detailed Implementation

[0042] The present invention will be further described below with reference to the embodiments and accompanying drawings:

[0043] Combination Figure 1 — Figure 10 As shown, an automatic quality inspection and sorting production line for inspection heads consists of a vibrating conveyor system c, an inspection workbench e, two gauge inspection platforms a installed on the inspection workbench e at left and right intervals, a workpiece positioning system b installed on the gauge inspection platforms a, and a material discharge classification system d.

[0044] The workpiece positioning system b consists of a lower positioning support b1, an upper positioning support b2, and a lifting cylinder b3. The lower positioning support b1 and the upper positioning support b2 together have a feeding channel b11 and a lifting channel b12 through which the extension and retraction end of the lifting cylinder b3 passes. When the workpiece f enters the lifting channel b12 from the feeding channel b11, the lifting cylinder b3 lifts the workpiece f until it is flush with the upper surface of the center area of ​​the upper positioning support b2.

[0045] The material sorting system d consists of a non-conforming conveying channel d4, a conforming conveying channel d5, a rotatable horizontal push cylinder d7, and a drive assembly that drives the horizontal push cylinder d7 to rotate. When the workpiece f is detected by the gauge assembly, the horizontal push cylinder d7 is rotated according to the detection result, so that the workpiece f can be aligned and pushed into the non-conforming conveying channel d4 or the conforming conveying channel d5.

[0046] The drive assembly consists of a driving gear d2, a driven gear d3, and a drive motor d6. The driven gear d3 and the drive motor d6 are mounted on the frame a8 via a classification mounting plate d1. The drive motor d6 is mounted below the classification mounting plate d1, and its rotating end passes through the classification mounting plate d1 and connects to the driving gear d2. The driven gear d3 is rotatably mounted above the classification mounting plate d1 via bearings. The outer periphery of the driven gear d3 has a rack that meshes with the driving gear d2 on the side adjacent to the driving gear d2. The horizontal push cylinder d7 is mounted on the driven gear d3 via a cylinder mounting plate d71. The telescopic end of the horizontal push cylinder d7 facing the workpiece f has a push support plate d72. The outer end of the push support plate d72 has an arc surface that matches the contour of the contact surface of the workpiece f.

[0047] The lower positioning support b1 and the lifting cylinder b3 are respectively installed on the upper and lower sides of the bottom horizontal support of the frame a8. The bottom horizontal support of the frame a8 is provided with a through hole for the extension end of the lifting cylinder b3 to pass through. The upper positioning support b2 is composed of a left support b21 and a right support b22. The top center of the lower positioning support b1 is provided with a circular groove. The lower part of the left support b21 matches the size of the circular groove at the center of the lower positioning support b1. The left support b21 and the lower positioning support b1 are provided with grooves with the same direction and size, and together with the right support b22, they form a feeding channel b11. The top of the left support b21 is provided with a guide groove b211 with the same direction corresponding to the unqualified conveying channel d4 and the qualified conveying channel d5. A limit b4 is bolted on the upper positioning support b2. The limit b4 is provided with a through hole for the gauge assembly to pass through for inspection corresponding to the center hole of the workpiece f.

[0048] A qualified conveying channel d5 and two unqualified conveying channels d4 located on both sides of the qualified conveying channel d5 are installed on the outer periphery of the left support b21 through the same arc-shaped connector. The arc-shaped connector has a semi-circular arc structure that fits the outer periphery of the left support b21.

[0049] The vibrating conveying system c consists of a conveying workbench c3, a vibrating conveying disc c1 mounted on the conveying workbench c3, and a workpiece conveying trough c2. The workpiece conveying trough c2 is connected to the feeding channel b11 located on the right gauge inspection platform a. The qualified conveying channel d5 located on the right gauge inspection platform a is connected to the feeding channel b11 located on the left gauge inspection platform a. Both the workpiece conveying trough c2 and the qualified conveying channel d5 located on the right gauge inspection platform a are equipped with linear vibrators d9. The unqualified conveying channel d4 consists of two types of channels: determined unqualified and critical value unqualified. The outlets of the unqualified conveying channel d4 and the qualified conveying channel d5 located on the left gauge inspection platform a are equipped with material placement boxes d8.

[0050] Linear vibrator d9 is used for vibratory conveying, which facilitates long-distance transport of workpieces along workpiece conveying trough c2 or qualified conveying channel d5.

[0051] The gauge inspection platform a consists of a frame a8, a linear module a1 vertically mounted on the frame a8, a gauge assembly mounted on the lifting seat of the linear module a1, and a needle gauge return detection assembly a9 mounted on the frame a8. The gauge assembly consists of a detection needle gauge a4, a movable inner cylinder a2, a movable outer cylinder a3, and a pressure sensor a6. The detection needle gauges a4 on the two gauge inspection platforms a have different dimensions and correspond to the upper tolerance limit of the hole diameter of the workpiece f as the no-go gauge and the lower tolerance limit of the hole diameter as the go gauge, respectively.

[0052] To mount the gauge assembly onto the lifting seat of the linear module a1, the upper part of the movable outer cylinder a3 of the gauge is provided with an outer cylinder mounting plate a34 that is threadedly connected to the lifting seat of the linear module a1, and the lower part is provided with a vertical notch a31. The length of the vertical notch a31 is greater than the length of the overlap with the movable inner cylinder a2 of the gauge, thus leaving space for the pressure sensor a6 wiring harness to pass through. Adjustable support plates a32 are provided on both sides of the vertical notch a31 corresponding to the overlap with the movable inner cylinder a2 of the gauge. 32 is connected by horizontal adjusting screws a33 spaced at the top and bottom. When the horizontal adjusting screws a33 are tightened, the inner diameter of the movable outer cylinder a3 of the gauge is tightened and fixed to the movable inner cylinder a2 of the gauge. The bottom thread of the movable inner cylinder a2 of the gauge is equipped with a mounting cover a23. The center of the mounting cover a23 is provided with a through hole, and the inner wall of the through hole is provided with an inclined surface a231 that fits with the lower part of the elastic collet a42. The inner wall of the movable inner cylinder a2 of the gauge is provided with a conical surface a22 that fits with the upper part of the elastic collet a42.

[0053] The testing needle gauge a4 is mounted on the lower end of the movable inner cylinder a2 of the gauge via a chuck assembly. A transfer stop a21 is installed at the top port of the movable inner cylinder a2. A spring a5, which provides preload, is installed between the testing needle gauge a4 and the transfer stop a21, thereby achieving elastic mounting of the testing needle gauge a4. The lower part of the movable outer cylinder a3 of the gauge is fitted onto the upper part of the movable inner cylinder a2 of the gauge. A pressure sensor a6 is installed inside the movable outer cylinder a3 above the transfer stop a21. When the testing needle gauge a4 moves down to enter the testing head under the drive of the linear module a1, the thrust of the testing needle gauge a4 is detected by the pressure sensor a6.

[0054] According to the required force, the preload of spring a5 is adjusted. Spring a5 is a compression spring. When the force used during the downward movement of the measuring needle gauge a4 is less than the preload of spring a5, spring a5 does not deform. However, when the resistance of the measuring needle gauge a4 exceeds the preload, the measuring needle gauge a4 rises, and spring a5 deforms. When the resistance of the measuring needle gauge a4 exceeds the compression limit of spring a5 and also exceeds the weight of the sensor protection block a7, in order to avoid exceeding the range of the pressure sensor a6, spring a5 pushes the top weight block of the sensor protection block a7 to disengage from the movable outer cylinder a3 of the gauge, so that the pressure sensor a6 only bears the weight of the sensor protection block a7, avoiding overload damage.

[0055] Considering that the pressure sensor a6 is easily damaged by excessive pressure, and that the components and replacement / repair costs are high, overload protection needs to be considered to prevent sensor damage due to exceeding the measurement range. In this embodiment, the pressure sensor a6 is equipped with a sensor protection block a7 on top. The bottom end of the sensor protection block a7 extends into the movable outer cylinder a3 of the gauge and connects to the pressure sensor a6. The top expands to form a counterweight block that rests on the movable outer cylinder a3 of the gauge. When the pressure on the detection needle gauge a4 exceeds the weight of the sensor protection block a7, the sensor protection block a7 is lifted so that it is no longer resting on the movable outer cylinder a3 of the gauge, so that the pressure sensor a6 is only affected by the gravity of the sensor protection block a7. The sensor protection block a7 is preferably 1 kg, and the pressure sensor a6 is preferably a miniature pressure sensor. The bottom rear end of the frame a8 is mounted on the detection workbench e through two left-right spaced support cylinders a81.

[0056] To better clamp the inspection needle gauge a4, the chuck assembly consists of a micro-diameter chuck a41 that clamps the inspection needle gauge a4 and an elastic collet chuck a42 that clamps the micro-diameter chuck a41. The lower part of the movable inner cylinder a2 of the gauge is partially flattened to expose the vertical bar opening. The micro-diameter chuck a41 is used to allow the inspection needle gauge a4 to move axially, and a spring contact block a51 is placed on top for the bottom end of the spring a5 to abut against. After the inspection needle gauge a4 passes through the micro-diameter chuck a41, it connects with the spring contact block a51. The spring contact block a51 has a needle gauge return detection bar a511 that extends out of the vertical bar opening. In the initial state, the needle gauge return detection bar a511 is located at the bottom end of the vertical bar opening. When the inspection needle gauge a4 is lifted by force, the spring a5 is compressed by the spring contact block a51, and at the same time, the needle gauge return detection bar a511 moves upward along the vertical bar opening.

[0057] Considering that the main path length can be known from the moving path of the linear module a1 lifting seat, and the return length of the detection needle gauge 4 also needs to be determined, in this embodiment, the needle gauge return detection component a9 consists of a laser emitter a91 and a laser receiver a92 installed on the frame a8 on the left and right respectively. The laser receiver a92 is provided with a vertical length scale. When the gauge component descends to the designed position for workpiece detection, the detection needle gauge a4 is pressed back up, and the needle gauge return detection strip a511 moves up from the bottom end of the vertical strip opening at the lower part of the gauge moving inner cylinder a2. The laser screen emitted by the laser emitter a91 can be partially blocked by the needle gauge return detection strip a511, so the return length of the detection needle gauge a4 can be obtained through the scale corresponding to the laser missing part of the laser receiver a92.

[0058] The sensor protection block a7 and the pressure sensor a6 are connected by an inverted "T" shaped sensor mounting block a71. The bottom of the sensor protection block a7 has a through hole for the upper part of the inverted "T" shaped sensor mounting block a71 to be inserted, and the inverted "T" shaped sensor mounting block a71 is installed by a horizontal pin a72. The bottom frustum of the inverted "T" shaped sensor mounting block a71 is threadedly connected to the pressure sensor a6.

[0059] An automatic quality inspection and sorting method for detection heads, the specific implementation steps are as follows:

[0060] S1. Set up an automated quality inspection and sorting production line with the detection head as described above;

[0061] S2. Set the pressure applied to workpiece f by the inspection needle gauge a4 (used as a go gauge) to the minimum allowable pressure value, and perform a qualification test on workpiece f. If workpiece f can pass smoothly under the minimum allowable pressure value, it is judged as qualified; if workpiece f is within the critical threshold range or obviously cannot pass, it is judged as unqualified.

[0062] S3. Set the pressure applied to workpiece f by the inspection needle gauge a4 (used as a stop gauge) to the maximum permissible pressure value, and perform a qualification test on workpiece f. If workpiece f obviously cannot pass under the maximum permissible pressure value, it is judged as qualified; if workpiece f is within the critical threshold range or can pass smoothly, it is judged as unqualified.

[0063] By adjusting the preload of spring a5 to 10N, which is to say, adjusting the minimum allowable pressure value to 10N, spring a5 will not deform when the pressure value of the needle gauge a4 is less than 10N.

[0064] Similarly, by adjusting the preload of spring a5 to 200N, which is to adjust the maximum allowable pressure value to 200N, when the pressure value of the detection needle gauge a4 is less than 200N, spring a5 will not deform. When the deformation exceeds the limit value, the sensor protection block a7 is triggered to protect the pressure sensor a6.

[0065] The test needle gauge a4 is considered to have passed smoothly when it is inserted into and penetrates the center inner hole of the workpiece. The critical threshold range is ±2N.

[0066] Steps S2 and S3 are not in any particular order.

Claims

1. An automated quality inspection and sorting production line with a detection head, characterized in that: The system includes a vibration conveying system (c), a testing workbench (e), two gauge inspection platforms (a) spaced apart on the testing workbench (e), a workpiece positioning system (b) mounted on both gauge inspection platforms (a), and a material sorting system (d). The gauge inspection platform (a) includes a frame (a8), a linear module (a1) vertically mounted on the frame (a8), a gauge assembly mounted on the lifting seat of the linear module (a1), and a needle gauge return detection assembly (a9) mounted on the frame (a8). The gauge assembly includes a needle gauge (a4). The needle gauges (a4) on the two gauge inspection platforms (a) have different dimensions and correspond to the upper tolerance limit of the workpiece (f) as a no-go gauge and the lower tolerance limit of the hole diameter as a go gauge, respectively. The workpiece positioning system (b) includes a lower positioning support (b1) and an upper positioning support (b2). The lifting cylinder (b3) is provided with a feeding channel (b11) and a lifting channel (b12) through which the extension end of the lifting cylinder (b3) passes. When the workpiece (f) enters the lifting channel (b12) from the feeding channel (b11), the lifting cylinder (b3) lifts the workpiece (f) to be flush with the upper surface of the center area of ​​the upper positioning support (b2). The discharge classification system (d) includes a non-conforming conveying channel (d4), a conforming conveying channel (d5), a rotatable horizontal pushing cylinder (d7), and a drive assembly for driving the horizontal pushing cylinder (d7) to rotate. After the workpiece (f) is detected by the gauge assembly, the angle of the horizontal pushing cylinder (d7) is rotated according to the detection result, so that the workpiece (f) can be aligned and pushed into the non-conforming conveying channel (d4) or the conforming conveying channel (d5).

2. The automatic quality inspection and sorting production line with a detection head according to claim 1, characterized in that: The drive assembly includes a drive gear (d2), a driven gear disk (d3), and a drive motor (d6). The driven gear disk (d3) and the drive motor (d6) are mounted on the frame (a8) via a classification mounting plate (d1). The drive motor (d6) is mounted below the classification mounting plate (d1), and its rotating end passes through the classification mounting plate (d1) and is connected to the drive gear (d2). The driven gear disk (d3) is rotatably mounted above the classification mounting plate (d1) via a bearing. The arc-shaped outer periphery of the driven gear disk (d3) is provided with a rack that meshes with the drive gear (d2) on one side adjacent to the drive gear (d2). The horizontal push cylinder (d7) is mounted on the driven gear disk (d3) via a cylinder mounting plate (d71). The telescopic end of the horizontal push cylinder (d7) facing the workpiece (f) is provided with a push support plate (d72). The outer end of the push support plate (d72) is provided with an arc surface that matches the contour of the contact surface of the workpiece (f).

3. The automatic quality inspection and sorting production line with a detection head according to claim 1, characterized in that: The lower positioning support (b1) and the lifting cylinder (b3) are respectively installed on the upper and lower sides of the bottom horizontal support of the frame (a8). The bottom horizontal support of the frame (a8) is provided with a through hole for the extension end of the lifting cylinder (b3) to pass through. The upper positioning support (b2) includes a left support (b21) and a right support (b22). The top center of the lower positioning support (b1) is provided with a circular groove. The lower part of the left support (b21) matches the size of the circular groove at the center of the lower positioning support (b1). The support (b21) and the lower positioning support (b1) are provided with grooves of the same direction and size, and together with the right support (b22) form a feeding channel (b11). The top of the left support (b21) is provided with guide grooves (b211) of the same direction corresponding to the unqualified conveying channel (d4) and the qualified conveying channel (d5). The upper positioning support (b2) is bolted to a limit baffle (b4). The limit baffle (b4) is provided with a through hole for the gauge assembly to pass through for inspection corresponding to the center hole of the workpiece (f).

4. The automatic quality inspection and sorting production line with a detection head according to claim 1, characterized in that: The vibrating conveying system (c) includes a conveying workbench (c3) and a vibrating conveying disc (c1) and a workpiece conveying trough (c2) both mounted on the conveying workbench (c3). The workpiece conveying trough (c2) is connected to the feeding channel (b11) on the right gauge inspection platform (a). The qualified conveying channel (d5) on the right gauge inspection platform (a) is connected to the feeding channel (b11) on the left gauge inspection platform (a). Both the workpiece conveying trough (c2) and the qualified conveying channel (d5) on the right gauge inspection platform (a) are equipped with linear vibrators (d9). The unqualified conveying channel (d4) includes two types of channels: determined unqualified and critical value unqualified. The outlet of both the unqualified conveying channel (d4) and the qualified conveying channel (d5) on the left gauge inspection platform (a) is equipped with a material placement box (d8).

5. The automatic quality inspection and sorting production line with a detection head according to claim 1, characterized in that: The gauge assembly also includes a movable inner gauge cylinder (a2), a movable outer gauge cylinder (a3), and a pressure sensor (a6). The detection needle gauge (a4) is installed at the lower end of the movable inner gauge cylinder (a2) via a clamp assembly. A transfer stop (a21) is installed at the top port of the movable inner gauge cylinder (a2). A spring (a5) providing preload is installed between the detection needle gauge (a4) and the transfer stop (a21) to achieve elastic installation of the detection needle gauge (a4). The lower part of the movable outer gauge cylinder (a3) ​​is fitted onto the upper part of the movable inner gauge cylinder (a2). A pressure sensor (a6) is installed inside the movable outer gauge cylinder (a3) ​​above the transfer stop (a21). When the detection needle gauge (a4) moves down to enter the detection head under the drive of the linear module (a1), the thrust of the detection needle gauge (a4) is detected by the pressure sensor (a6).

6. The automatic quality inspection and sorting production line with a detection head according to claim 5, characterized in that: The pressure sensor (a6) is equipped with a sensor protection block (a7) on top. The bottom end of the sensor protection block (a7) extends into the movable outer cylinder of the gauge (a3) ​​and is connected to the pressure sensor (a6). The top expands to form a counterweight block that rests on the movable outer cylinder of the gauge (a3). When the pressure on the detection needle gauge (a4) exceeds the weight of the sensor protection block (a7), the sensor protection block (a7) is lifted up and no longer rests on the movable outer cylinder of the gauge (a3), so that the pressure sensor (a6) is only affected by the gravity of the sensor protection block (a7). The sensor protection block (a7) weighs 1 kg. The pressure sensor (a6) is a miniature pressure sensor. The bottom rear end of the frame (a8) is mounted on the detection workbench (e) through two support cylinders (a81) spaced apart on the left and right.

7. The automatic quality inspection and sorting production line with a detection head according to claim 5, characterized in that: The chuck assembly includes a micro-diameter chuck (a41) for clamping the test needle gauge (a4) and an elastic collet chuck (a42) for clamping the micro-diameter chuck (a41). The lower part of the movable inner cylinder of the gauge (a2) is partially flattened to expose the vertical bar opening. The micro-diameter chuck (a41) is used to allow the test needle gauge (a4) to move axially, and a spring contact block (a51) is placed on top for the bottom end of the spring (a5) to abut. The test needle gauge (a4) passes through the micro-diameter chuck (a41) and connects to the spring contact block (a51). The spring contact block (a51) has a needle gauge return detection bar (a511) extending out of the vertical bar opening. In the initial state, the needle gauge return detection bar (a511) is located at the bottom end of the vertical bar opening. When the test needle gauge (a4) is subjected to force and rises, it passes through the spring contact block. (a51) Push the spring (a5) to compress, and at the same time the needle gauge return detection strip (a511) moves up along the vertical bar opening; the needle gauge return detection assembly (a9) includes a laser emitter (a91) and a laser receiver (a92) installed on the frame (a8) on the left and right respectively. The laser receiver (a92) is provided with a vertical length scale. When the gauge assembly descends to the design position to inspect the workpiece, the detection needle gauge (a4) is pressed back up, and the needle gauge return detection strip (a511) moves up from the bottom end of the vertical bar opening at the lower part of the gauge movable inner cylinder (a2). The laser screen emitted by the laser emitter (a91) can be partially blocked by the needle gauge return detection strip (a511), so the return length of the detection needle gauge (a4) can be obtained through the scale corresponding to the laser missing part of the laser receiver (a92).

8. The automatic quality inspection and sorting production line with a detection head according to claim 5, characterized in that: The upper part of the movable outer cylinder of the gauge (a3) ​​is provided with an outer cylinder mounting plate (a34) that is threadedly connected to the lifting seat of the linear module (a1), and the lower part is provided with a vertical notch (a31). The length of the vertical notch (a31) is greater than the length of the overlap with the movable inner cylinder of the gauge (a2), thereby leaving space for the pressure sensor (a6) wiring harness to pass through. The vertical notch (a31) is provided with adjusting support plates (a32) on both sides of the overlap with the movable inner cylinder of the gauge (a2). The two adjusting support plates (a32) are set at an upper and lower interval. The horizontal adjusting screw (a33) is connected. When the horizontal adjusting screw (a33) is tightened, the inner diameter of the movable outer cylinder (a3) ​​of the gauge is tightened and fixed to the movable inner cylinder (a2). The bottom end of the movable inner cylinder (a2) of the gauge is threaded with a mounting cap (a23). The center of the mounting cap (a23) is provided with a through hole, and the inner wall of the through hole is provided with an inclined surface (a231) that fits with the lower part of the elastic collet chuck (a42). The inner wall of the movable inner cylinder (a2) of the gauge is provided with a conical surface (a22) that fits with the upper part of the elastic collet chuck (a42).

9. An automatic quality inspection and sorting production line with a detection head according to claim 5, characterized in that: The sensor protection block (a7) and the pressure sensor (a6) are connected by an inverted "T" shaped sensor mounting block (a71). The bottom end of the sensor protection block (a7) is provided with a through hole for the upper part of the inverted "T" shaped sensor mounting block (a71) to be inserted, and the inverted "T" shaped sensor mounting block (a71) is installed by a horizontal pin (a72). The bottom frustum of the inverted "T" shaped sensor mounting block (a71) is threadedly connected to the pressure sensor (a6).

10. An automatic quality inspection and sorting method for a detection head, characterized in that, Includes the following steps: S1. Construct an automated quality inspection and sorting production line for the detection head as described in any one of claims 1 to 9; S2. Set the pressure applied to the workpiece (f) by the test needle gauge (a4) as the minimum allowable pressure value, and perform a qualification test on the workpiece (f); if the workpiece (f) can pass smoothly under the minimum allowable pressure value, it is judged as qualified; if the workpiece (f) is within the critical threshold range or obviously cannot pass, it is judged as unqualified. S3. Set the pressure applied to the workpiece (f) by the inspection needle gauge (a4) as the maximum allowable pressure value, and perform a qualification test on the workpiece (f); if the workpiece (f) obviously cannot pass under the maximum allowable pressure value, it is judged as qualified; if the workpiece (f) is within the critical threshold range or can pass smoothly, it is judged as unqualified. Steps S2 and S3 are not in any particular order.

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