Product detection dual repeat judgment mechanism, detection method and automatic production line

Abstract

The application discloses a product double-repeating judgment mechanism, a detection method and an automatic production line, belongs to the online detection technical field in mechanical automatic manufacturing, and comprises a base; a first detection unit is arranged on the base and located at the upstream of a machining station; a second detection unit is arranged on the base and located at the downstream of the machining station; the first detection unit and the second detection unit are arranged in a compact layout and integrated on the same base, and double detection before and after machining is seamlessly embedded. Therefore, incoming material reinspection and result confirmation can be completed on one station, valuable production line layout space or complex multi-station design is not additionally occupied, and the spatial contradiction of online multiple detection in precision machining is solved from the structural root. Furthermore, the second detection result of the second detection unit is fed back to the first detection unit in real time or periodically through a linkage control module, so that the detection system has self-learning, self-adapting and self-calibrating capabilities.

Description

Technical Field

[0001] This invention relates to the field of online inspection technology in automated mechanical manufacturing, and particularly to a double-checking mechanism for product inspection, an inspection method, and an automated production line. Background Technology

[0002] In the field of precision machining, especially in automated production lines involving CNC machine tools and machining centers, real-time online monitoring of workpiece dimensions, geometric tolerances, and assembly status is crucial for ensuring product quality. Traditionally, for workpieces with high precision requirements, they are typically moved to a dedicated coordinate measuring machine or offline inspection station for measurement after machining. This method cannot achieve real-time feedback and adjustment during the machining process, easily leading to batch defects. To solve this problem, online inspection technology has been introduced into the machine tool environment.

[0003] However, existing online inspection solutions integrated into machine tools or production lines still have significant drawbacks: First, limited by the compact space inside the machine tool or around the production line station, only a single inspection sensor can usually be installed, such as setting up a probe or photoelectric sensor for final inspection after processing. Single-point inspection cannot distinguish whether the workpiece is defective due to the incoming material being out of tolerance or due to a processing error in this process, leading to difficulties in quality traceability and long process debugging cycles. Second, in typical machine tool working environments such as vibration and cutting fluid splashing, the stability and reliability of the inspection device face challenges. If a single sensor is falsely triggered, it will cause misjudgments, resulting in unnecessary downtime or the wrong rejection of qualified products. In addition, although complex vision measurement systems can obtain more information, they are difficult to deploy in machine tool scenarios with limited space, changing ambient light, and oil contamination, and are costly and complex to maintain.

[0004] Therefore, there is an urgent need for an online dual inspection solution that can adapt to the compact space of machine tools, has strong anti-interference capabilities, and can distinguish the responsibilities of processing steps. Summary of the Invention

[0005] The main objective of this invention is to provide a double-check mechanism, inspection method, and automated production line for product inspection. It aims to solve the technical problem that for workpieces with high precision requirements, they are usually moved to a dedicated coordinate measuring machine or offline inspection station for measurement after processing. This method cannot achieve real-time feedback and adjustment during the processing, which can easily lead to batch scrap.

[0006] To achieve the aforementioned objectives, the first aspect of this invention proposes a double-review product inspection mechanism, applicable to an automated production line with processing stations, comprising:

[0007] Base;

[0008] The first detection unit is disposed on the base and located upstream of the processing station, and is used to perform the first status detection on the product before it enters the processing station;

[0009] The second detection unit is disposed on the base and located downstream of the processing station, and is used to perform secondary status detection on the product after it leaves the processing station.

[0010] The linkage control module is connected to the first detection unit and the second detection unit respectively, and is used to receive the secondary state detection result of the second detection unit, and to reverse calibrate or adjust the detection threshold, detection sensitivity or detection logic of the first detection unit based on the secondary state detection result.

[0011] The first detection unit and the second detection unit are spaced apart along the product conveying direction, so that the same product can sequentially pass through the first detection unit's initial state detection, the processing operation of the processing station, and the second detection unit's secondary state detection. Furthermore, the linkage control module dynamically optimizes the detection strategy of the first detection unit based on the statistical trend of the secondary state detection results of multiple consecutive products, in order to compensate for the consistency fluctuations of upstream incoming materials or environmental drift.

[0012] Optionally, both the first detection unit and the second detection unit include a through-beam photoelectric sensor.

[0013] Optionally, the through-beam photoelectric sensor is a fiber optic sensor or an amplifier-separated sensor.

[0014] Optionally, both the initial state inspection and the secondary state inspection include inspecting at least one parameter among the product's dimensional accuracy, positional deviation, or assembly integrity.

[0015] Optionally, it also includes a mounting plate, on which both the first detection unit and the second detection unit are mounted, and the mounting plate is connected to the base.

[0016] Optionally, the mounting plate is provided with an adjustment structure for adjusting the installation position of at least one of the first detection unit and the second detection unit.

[0017] Optionally, the adjustment structure includes an elongated hole on the mounting plate, or a slider assembly connected to the first detection unit or the second detection unit, wherein the slider assembly slides with the mounting plate in a preset direction.

[0018] Optionally, the first detection unit and the second detection unit each include multiple detection points for simultaneously detecting different parts or features of the product.

[0019] A second aspect of this invention proposes a detection method using the aforementioned product testing double-reassessment mechanism, comprising the following steps:

[0020] The product is transported to the processing station;

[0021] The first detection unit performs an initial detection on the product before it enters the processing station and obtains a first detection signal;

[0022] The product undergoes processing operations at the processing station;

[0023] The second detection unit performs a secondary detection on the product after it leaves the processing station and obtains a second detection signal;

[0024] Based on the first detection signal and the second detection signal, the state of the product is comprehensively determined, wherein...

[0025] If the first detection signal is abnormal, it is determined that the product was in an abnormal state before entering the processing station.

[0026] If the first detection signal is normal but the second detection signal is abnormal, it is determined that the abnormal product status originates from the processing operation of the processing station.

[0027] The linkage control module receives the second detection signal and adjusts the detection threshold or sensitivity parameter of the first detection unit in reverse according to the changing trend of the second detection signal.

[0028] A third aspect of the present invention proposes an automated production line, which further includes the aforementioned product inspection double-re-judgment mechanism. The control unit is signal-connected to the first inspection unit, the second inspection unit, and the processing station, and is used to control the production process according to the inspection signals. The linkage control module is integrated inside the control unit, or is a separate module that communicates with the control unit.

[0029] The beneficial effects of this invention are:

[0030] 1. The product inspection dual-re-judgment mechanism, inspection method, and automated production line of the present invention integrates the first inspection unit and the second inspection unit in a compact layout on the same base, located before and after the machine tool processing station, respectively. This seamlessly embeds dual inspection before and after processing within the extremely limited inherent space of the machine tool or production line. This allows incoming material re-inspection and result confirmation to be completed at a single station, eliminating the need for additional valuable production line layout space or complex multi-station designs. It fundamentally solves the spatial contradiction of online multiple inspections in precision machining. Furthermore, the linkage control module feeds back the secondary inspection results of the second inspection unit to the first inspection unit in real time or periodically, and dynamically adjusts the detection threshold, sensitivity, or detection logic of the first inspection unit based on the statistical trends of multiple consecutive products, giving the inspection system self-learning, self-adaptation, and self-calibration capabilities. It automatically compensates for incoming material fluctuations and environmental drift without manual intervention, significantly reducing equipment maintenance downtime and improving the overall efficiency of the production line. The dynamic tracking of the detection threshold by the linkage control module keeps the output signal of the first inspection unit stable, greatly reducing false alarm rates and the number of idle operations. The frequency of operation of the rejection mechanism, alarm, and conveying device has decreased significantly, the mechanical life of the equipment has been extended, and maintenance costs have been reduced accordingly.

[0031] 2. The product inspection dual-reaction mechanism, inspection method, and automated production line of this invention preferably employ non-contact measurement methods such as through-beam photoelectric sensors. Through multi-detection point configuration, it achieves rapid and stable inspection of workpiece dimensional accuracy, positional deviation, and assembly integrity. This design significantly improves the robustness and reliability of online measurement under harsh conditions such as machine tool vibration and oil contamination. By correlating pre- and post-detection data, it is possible to accurately determine whether quality anomalies originate from upstream processes or the machine's machining process, providing precise diagnostic basis for optimizing machine tool process parameters.

[0032] 3. The product inspection double-re-judgment mechanism, inspection method, and automated production line of this invention, with its modular mounting plate and precise adjustment structure design, embody the modularity and adjustability of machine tool components. This design allows the inspection unit to be quickly installed, pre-adjusted offline, and easily maintained as a whole module, greatly facilitating the initial calibration of the inspection unit on the machine tool and rapid readjustment during product changeovers, thus shortening the machine tool's auxiliary time.

[0033] 4. The product inspection dual-reaction mechanism, inspection method, and automated production line of this invention, based on the diagnostic logic of comparing before and after signals, construct an inherent error verification mechanism. This effectively suppresses false alarms from single-point sensors caused by instantaneous interference in the machine tool environment, significantly improving the reliability of online inspection conclusions. Simultaneously, it promptly intercepts defective incoming workpieces, avoiding wear and tear on machine tool cutting tools from subsequent ineffective processing, and provides immediate alarms for processing anomalies.

[0034] 5. The product inspection dual-re-judgment mechanism, inspection method, and automated production line of the present invention integrate this dual inspection mechanism as a standard module into an automated production line composed of CNC machine tools, etc., realizing closed-loop control of inspection, judgment, and execution. This not only improves the automation monitoring level of a single machine tool, but also achieves intelligent quality control and production traceability of the entire manufacturing unit through data interaction, providing a reliable technical foundation for building digital workshops and flexible manufacturing systems. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the overall structure of the double-reaction detection mechanism for the product of the present invention;

[0036] Figure 2 This is a side view schematic diagram of the double-reaction detection mechanism for the product of the present invention;

[0037] Figure 3 This is a front view schematic diagram of the double-reaction detection mechanism for the product of the present invention;

[0038] Figure 4 This is a top view schematic diagram of the double-reaction detection mechanism for the product of the present invention;

[0039] Figure 5 This is a schematic diagram of the overall perspective of the dual-reaction detection mechanism of the product of the present invention;

[0040] Figure 6 This is a partially enlarged schematic diagram of the first detection unit of the dual-reaction detection mechanism for the product of the present invention;

[0041] Figure 7 This is a schematic diagram of the system control for the double-reaction detection mechanism of the product of the present invention.

[0042] Explanation of reference numerals in the attached figures:

[0043] 100. Base; 101. First detection unit; 102. Second detection unit; 103. Mounting plate; 104. Linkage control module.

[0044] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0046] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this specification means the presence of features, integers, steps, operations, elements, modules, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, modules, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein can include wireless connections or wireless coupling. The term “and / or” as used herein includes all or any modules and all combinations of one or more associated listed items.

[0047] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0048] Example 1

[0049] Reference Figures 1-7 This implementation provides an example of a double-reassessment mechanism for product testing.

[0050] The base 100 is typically fixed to a specific location on the automated production line frame using bolts or clamps, such as being directly mounted on one side of the processing module. The first detection unit 101 and the second detection unit 102 are positioned one after the other on the base 100, strictly following the product's path through the processing station. The detection optical axis of the first detection unit 101 is located on the path before the product enters the processing area (e.g., below the stamping head or welding head), and its installation height is aligned with the feature to be measured on the product. The second detection unit 102 is positioned within the area where the processing action is completed and the product has moved out but not yet entered the next station. Without adding additional independent detection stations, dual detection functions are seamlessly integrated within the existing processing station's spatial framework, perfectly addressing the industry challenge of achieving multiple detections within limited equipment space.

[0051] To achieve non-contact, high-response detection, the first detection unit 101 and the second detection unit 102 preferably employ through-beam photoelectric sensors. This sensor comprises separate transmitter and receiver ends, respectively mounted on opposite sides of the product conveyor track. When a product passes normally, it briefly blocks the light beam, causing a change in the sensor's output signal; if the product is missing, too small, or misaligned, preventing complete beam blocking, the signal status becomes abnormal. The significant advantages of using this type of sensor lie in its extremely high reliability and low maintenance costs. Compared to vision systems, it is significantly unaffected by changes in ambient light, product surface reflections, or dust, and offers a clear price advantage.

[0052] The linkage control module 104 is connected to the first detection unit 101 and the second detection unit 102 respectively, and is used to receive the secondary state detection result of the second detection unit 102, and to reverse calibrate or adjust the detection threshold, detection sensitivity or detection logic of the first detection unit 101 based on the secondary state detection result.

[0053] The linkage control module 104 dynamically optimizes the detection strategy of the first detection unit 101 based on the statistical trend of the secondary state detection results of multiple consecutive products, so as to compensate for the consistency fluctuations of upstream incoming materials or environmental drift.

[0054] Furthermore, the linkage control module 104 includes a signal acquisition unit, a data processing unit, and a parameter adjustment unit.

[0055] The signal acquisition unit is electrically connected to the second detection unit 102 and is used to receive secondary state detection signals in real time or periodically.

[0056] The data processing unit has a built-in microcontroller (MCU) or programmable logic device (FPGA / CPLD) to perform statistical analysis on the secondary detection signals of multiple products in succession, and generate compensation values ​​for detection thresholds or switching instructions for detection logic.

[0057] The parameter adjustment unit is connected to the control terminal or parameter setting terminal of the first detection unit 101. Through analog output, digital communication interface (such as RS485, IO-Link, EtherCAT) or potentiometer adjustment circuit, the compensation value or instruction is written into the internal register or adjustment circuit of the first detection unit 101.

[0058] If the first detection unit 101 is an analog output fiber optic sensor, its detection threshold is determined by an external voltage divider circuit. The linkage control module 104 has a built-in digital potentiometer or DAC conversion circuit. The data processing unit dynamically adjusts the resistance of the digital potentiometer according to the long-term average change of the second detection signal, thereby changing the comparator reference voltage of the first detection unit 101 and realizing automatic calibration of the detection sensitivity.

[0059] The linkage control module 104 adjusts the "detection strategy" of the first detection unit 101, including but not limited to dynamically modifying one or more of the following parameters:

[0060] Detection threshold: The boundary value at which a product is judged as qualified / unqualified;

[0061] Sensitivity level: the amplification gain or response speed of the sensor;

[0062] Delay time: The delay time or blanking time for the detection trigger;

[0063] Detection logic: For example, switching from "bright" to "dark", or from "single-point trigger" to "window comparison";

[0064] Self-diagnostic frequency: The frequency at which the sensor performs periodic self-checks.

[0065] In terms of specific selection, the choice can be made based on the constraints of the installation space. In situations where space is extremely limited and the sensor itself is difficult to fit, fiber optic sensors can be used, with only a small fiber optic probe extending into the detection area, and the amplifier can be remotely positioned. Another common option is a separate amplifier sensor, whose compact sensor head facilitates installation, while the signal processing unit can be centrally located in an electrical cabinet for easy wiring and diagnostics. This provides flexibility to adapt to the physical constraints of different production lines. It is worth noting that in some scenarios involving the detection of metal products where precise distance measurement is not required, inductive proximity switches can serve as an equivalent replacement for through-beam photoelectric sensors, and their cost may be more advantageous.

[0066] In this organization, "Status Inspection" is a configurable set of functions. Initial status inspection primarily serves "incoming material inspection," and its parameters can be set to: check if the maximum external dimension of the product exceeds tolerance (determining if the incoming material is correct), check if the locating pins of the product in the fixture are in place (determining positional deviation), or check if the screw heads pre-installed in the previous stage are exposed (determining assembly integrity). Secondary status inspection focuses on "result verification," such as: checking if holes generated after machining allow light beams to penetrate (determining if the aperture meets standards), checking if product warping due to stress after machining exceeds allowable limits, or checking if parts pressed into place at this station protrude from the surface. Through differentiated settings and correlation analysis of pre- and post-inspection content, this organization achieves precise process responsibility definition. It transforms a single quality "non-conformity" result into process diagnostic information on "when and where the problem occurred."

[0067] The introduction of mounting plate 103 is key to the rapid deployment of this mechanism. During actual assembly, operators can first install the first detection unit 101 and the second detection unit 102 onto the unified mounting plate 103 using their respective brackets on the workbench. At this stage, measuring tools can be easily used to accurately set the center distance between the two detection units; this distance must be greater than the product length and allow for sufficient space for machining tools. After pre-assembly, the entire mounting plate 103 is then fixed to the base 100 on the production line using screws. This significantly reduces downtime for online debugging and improves the deployment efficiency of production equipment.

[0068] To compensate for accumulated errors from machining and installation on the production line, and to accommodate changes in the detection point positions of different product models, an adjustment structure is essential. As shown in the attached diagram, a simple and reliable implementation involves machining elongated holes in the mounting plate 103. The fixing bolts of the sensor bracket pass through these elongated holes and can slide within a certain range after being loosened, enabling coarse and fine adjustments to the position. For applications requiring higher precision and stability, a slider assembly can be used. For example, the sensor bracket can be mounted on the slider of a linear guide rail, driven by a fine-tuning screw, achieving smooth, precise, and slip-free position adjustment after locking. The adjustment structure ensures that the detection beam is always accurately aligned with the product's designed detection points. When using elongated hole adjustment, it is recommended to use bolts with toothed anti-slip washers, or apply an appropriate amount of threadlocker after adjustment to prevent bolt loosening due to long-term vibration.

[0069] The specific process for adjusting the elongated hole is as follows: First, loosen the nut, then gently tap the sensor bracket with your hand or a tool to make it slide. A dial indicator or feeler gauge can be used to assist in positioning. After confirming the position, pre-tighten the nut, verify the position again, and finally tighten it completely. It is worth noting that it is best to have a scale next to the elongated hole for easy coarse adjustment.

[0070] For products with complex shapes or extremely high quality requirements, a single detection point may be insufficient. In such cases, the first detection unit 101 and / or the second detection unit 102 can be configured to include multiple independent detection points. For example, when detecting whether a rectangular circuit board component is in place, four pairs of photoelectric sensors can be arranged at the four corners of the board to simultaneously detect the presence of all four components. This not only improves the reliability of the detection (a single point of failure will not lead to overall misjudgment) but also allows for new detection dimensions, such as indirectly determining whether the product is rotated or tilted by calculating the timing difference of beam obstruction on the diagonal. The multi-detection-point arrangement realizes an upgrade from "presence / absence judgment" to "state perception," providing a richer data foundation for process optimization.

[0071] The control flow of this invention is as follows:

[0072] The product flows through the second detection unit 102, generating a secondary detection signal;

[0073] The linkage control module 104 stores the secondary detection signal into the circular buffer;

[0074] Every T time interval or every Y products detected, the data processing unit calculates the statistical characteristics of the detected values ​​in the buffer.

[0075] If the statistical characteristics exceed the preset stable range, the parameter adjustment unit sends an adjustment command to the first detection unit 101;

[0076] The first detection unit 101 updates its internal parameters and takes effect in the first detection of the next product.

[0077] Example 2

[0078] This embodiment is based on the detection method of the double-reaction mechanism for product testing in Embodiment 1.

[0079] The execution entity of this method is typically a programmable logic controller (PLC) or industrial computer on the production line. The process begins with the product being transported by a conveyor and entering the field of view of the first detection unit 101. The PLC captures the first detection signal at this point, which may be a switching quantity (on / off) or an analog quantity (such as light intensity attenuation), depending on the type of sensor selected.

[0080] The essence of the method lies in the subsequent signal processing and logical judgment steps. The control unit internally pre-defines a signal characteristic model of a qualified product. Instead of viewing each detection result in isolation, it performs a temporal correlation comparison between the first and second detection signals:

[0081] When the first detection signal exceeds the preset acceptable range, the control unit can immediately infer that the problem occurred before the current workstation. This could be a processing error in an upstream process or a material delivery error. At this point, the controller can issue various commands, such as illuminating an alarm light, displaying "Incoming material defective" on the user interface, and most effectively, pausing the current processing cycle at the workstation, and possibly instructing the conveyor line to reject the defective product or send it to the rework line. The core function of this method is to achieve "entry point interception" of quality problems, avoiding subsequent ineffective processing and resource waste, which is key to improving overall production efficiency.

[0082] When the first detection signal is normal, but the subsequent second detection signal is abnormal, the diagnostic conclusion is very clear: the product was qualified upon entry; the problem lies in the processing at this workstation. This directly points to specific processing parameter issues such as tool wear, spindle positioning drift, insufficient air pressure, or assembly mechanism malfunction. In addition to alarms and sorting defective products, the controller can also record this abnormal event, providing direct evidence for equipment condition monitoring and predictive maintenance. The diagnostic logic based on comparing preceding and following signals significantly reduces the false alarm rate. It effectively distinguishes between process abnormalities and incoming material abnormalities, greatly improving the speed of problem location and troubleshooting, and reducing unplanned downtime caused by misjudgments.

[0083] Example 3

[0084] This embodiment integrates an automated production line system with the aforementioned double-review mechanism for product testing.

[0085] In this production line, the product inspection double-check mechanism, inspection method, and automated production line are no longer independent inspection stations, but rather intelligent sensing nodes deeply embedded in the production control system. The control unit, as the system hub, establishes bidirectional signal connections with the first inspection unit 101, the second inspection unit 102, the actuators of the processing station (such as servo motors and pneumatic solenoid valves), and the conveying devices (such as variable frequency motors and robotic arms) through I / O modules or fieldbus networks.

[0086] Integration creates collaborative closed-loop control. For example, when the mechanism determines that the material output is defective (first signal abnormality), the integrated logic of the control unit might be:

[0087] 1) Send a pause or speed reduction command to the conveyor;

[0088] 2) Send a "skip" signal to the machining station to prevent it from performing machining actions in this cycle;

[0089] 3) Trigger a specific sorting robot to remove the defective product from the main flow line. The entire process is fully automated and requires no human intervention.

[0090] Furthermore, in flexible manufacturing scenarios, when switching between different product models on the production line, the control unit can call pre-stored detection programs for different products and send instructions via the network to a communication-enabled adjustment structure (such as a servo-electric cylinder-driven slider assembly) to automatically adjust the positions of the two detection units, thereby achieving rapid product changeover on the production line. The ultimate benefit of integrating this mechanism into an automated production line is the realization of closed-loop quality control from "perception-judgment-execution" to "traceability-optimization." All detection data, diagnostic results, and images of defective products (if linked to vision systems) can be uploaded to the Manufacturing Execution System in real time, providing a solid data foundation for visualization, traceability, and continuous optimization of the entire production process, responding to the core demands for digital and intelligent manufacturing in the background technology.

[0091] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A product inspection double-review mechanism, applied to an automated production line with processing stations, characterized in that, include: Base (100); The first detection unit (101) is disposed on the base (100) and located upstream of the processing station, and is used to perform the first status detection on the product before it enters the processing station; The second detection unit (102) is disposed on the base (100) and located downstream of the processing station, and is used to perform secondary status detection on the product after it leaves the processing station; The linkage control module (104) is connected to the first detection unit (101) and the second detection unit (102) respectively, and is used to receive the secondary state detection result of the second detection unit (102), and to reverse calibrate or adjust the detection threshold, detection sensitivity or detection logic of the first detection unit (101) based on the secondary state detection result. The linkage control module (104) includes: The signal acquisition unit is electrically connected to the second detection unit (102) and is used to receive secondary state detection signals in real time or periodically. The data processing unit, with a built-in microcontroller or programmable logic device, is used to perform statistical analysis on the secondary detection signals of multiple products in succession, and generate compensation values ​​for the detection threshold or switching instructions for the detection logic. The parameter adjustment unit is connected to the control terminal or parameter setting terminal of the first detection unit (101). It writes the compensation value or instruction into the internal register or adjustment circuit of the first detection unit (101) through analog output, digital communication interface or potentiometer adjustment circuit. The first detection unit (101) and the second detection unit (102) are spaced apart along the product conveying direction, so that the same product can sequentially pass through the first state detection of the first detection unit (101), the processing operation of the processing station, and the second state detection of the second detection unit (102); and the linkage control module (104) dynamically optimizes the detection strategy of the first detection unit (101) according to the statistical trend of the second state detection results of multiple consecutive products, so as to compensate for the consistency fluctuation of upstream materials or environmental drift.

2. The product testing double-reassessment mechanism according to claim 1, characterized in that, Both the first detection unit (101) and the second detection unit (102) include through-beam photoelectric sensors.

3. The product testing double-reassessment mechanism according to claim 2, characterized in that, The through-beam photoelectric sensor is either a fiber optic sensor or an amplifier-separated sensor.

4. The product testing double-reassessment mechanism according to claim 1, characterized in that, Both the initial state inspection and the secondary state inspection include inspecting at least one of the following: dimensional accuracy, positional deviation, or assembly integrity of the product.

5. The product testing double-reassessment mechanism according to claim 1, characterized in that, It also includes a mounting plate (103), on which the first detection unit (101) and the second detection unit (102) are both mounted, and the mounting plate (103) is connected to the base (100).

6. The product testing double-reaction mechanism according to claim 5, characterized in that, The mounting plate (103) is provided with an adjustment structure, which is used to adjust the installation position of at least one of the first detection unit (101) and the second detection unit (102).

7. The product testing double-reassessment mechanism according to claim 6, characterized in that, The adjustment structure includes an elongated hole on the mounting plate (103) or a slider assembly connected to the first detection unit (101) or the second detection unit (102), wherein the slider assembly slides in cooperation with the mounting plate (103) in a preset direction.

8. The product testing double-reassessment mechanism according to any one of claims 1-7, characterized in that, The first detection unit (101) and the second detection unit (102) each include multiple detection points for synchronous detection of different parts or features of the product.

9. A detection method using a double-reaction product testing mechanism as described in any one of claims 1 to 8, characterized in that, Includes the following steps: The product is transported to the processing station; The first detection unit (101) performs an initial detection on the product before it enters the processing station and obtains a first detection signal; The product undergoes processing at the processing station; The second detection unit (102) performs a second detection on the product after it leaves the processing station and obtains a second detection signal; Based on the first detection signal and the second detection signal, the state of the product is comprehensively determined, wherein... If the first detection signal is abnormal, it is determined that the product was in an abnormal state before entering the processing station. If the first detection signal is normal but the second detection signal is abnormal, it is determined that the abnormal product status originates from the processing operation of the processing station. The linkage control module (104) receives the second detection signal and adjusts the detection threshold or sensitivity parameter of the first detection unit (101) in reverse according to the changing trend of the second detection signal.

10. An automated production line, comprising a conveying device, a processing station, and a control unit, characterized in that, It also includes a product inspection double-re-judgment mechanism as described in any one of claims 1 to 8, wherein the control unit is connected to the first detection unit (101), the second detection unit (102) and the processing station signal, and is used to control the production process according to the detection signal; the linkage control module (104) is integrated inside the control unit, or is connected to the control unit as an independent module.

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