A drill breakage detection method and detection system

Abstract

The application discloses a kind of drill package broken tool detection method and detection system, comprising the following steps: the bar code information of the plate to be processed is introduced into host computer, and the coordinate value of the movement of optical fiber sensor to detection position is set in host computer;Control the optical fiber sensor to move to detection position, after drill package mechanism moves to the above of detection position, control several cutters to be in turn stretched to the direction of detection position, if the light beam emitted by the optical fiber sensor can be blocked, then host computer can receive the feedback signal of optical fiber sensor, then judge that the cutter is normal, otherwise the cutter is abnormal, retract the cutter after that, move the next cutter to the above of detection position, and then control the cutter to stretch, and detect in turn;Abnormal plate processed by abnormal cutter is inquired through host computer, the bar code information of abnormal plate is obtained, and the processing position of abnormal plate is positioned according to bar code information.The automatic broken tool detection of drill package cutter with different diameters is realized, and the advantages of tracking and positioning abnormal plate are achieved.

Description

Technical Field

[0001] This invention relates to the field of drill bit breakage detection technology, and in particular to a method for detecting drill bit breakage. Background Technology

[0002] Woodworking machine tools are widely used in the wood processing industry, such as for board cutting, carving, and drilling. As the wood processing industry moves towards intelligent and automated processes, higher demands are being placed on the processing precision and efficiency of woodworking machine tools. As the core component of a woodworking machine tool, the condition of the cutting tool directly affects processing quality and production efficiency. However, during wood processing, cutting tools are prone to breakage or damage due to uneven material hardness, complex processing techniques, and excessive cutting forces. If broken tools are not detected in time, it can lead to scrapped workpieces, machine tool damage, and even safety accidents. Therefore, developing broken tool detection technology for woodworking machine tools is of great significance.

[0003] In traditional woodworking machine tool processing, broken tool detection mainly relies on manual inspection, where workers judge whether a tool is broken by observing its appearance or the processing effect. This detection method has several problems: First, the detection efficiency is low, as manual inspection requires a lot of time and effort, making it difficult to meet the needs of large-scale production; second, the detection accuracy is not high, as human judgment is easily affected by subjective factors and environmental interference, making it difficult to accurately identify minor tool damage; third, real-time detection cannot be achieved, and when a tool breaks, it has often already caused irreparable damage to the workpiece and the machine tool.

[0004] Currently available tool breakage detection technologies mainly include methods based on cutting force monitoring, spindle current analysis, and vibration signal detection, as well as detection devices employing machine vision and laser scanning technologies. However, these technologies have many limitations in drilling rig applications: the internal space of the drilling rig is small and the machining environment is complex, making it difficult to implement optical detection technologies such as machine vision; the diameter of drilling rig tools varies greatly, making the installation and debugging of ordinary photoelectric sensors difficult and prone to false alarms; the characteristic of multiple tools working simultaneously in the drilling rig makes traditional single-tool detection solutions unsuitable. Furthermore, the structure of the drilling rig differs significantly from that of the spindle, making existing detection technologies for spindle end mills difficult to directly apply to drill rig tool breakage detection. Therefore, there is an urgent need to develop a tool breakage detection solution that can adapt to the structural characteristics of the drilling rig and achieve efficient detection of multiple tools. Existing technologies urgently need improvement to address these issues. Summary of the Invention

[0005] To address the shortcomings of the existing technologies, this invention provides a method and system for detecting broken drill bits, enabling automated detection of broken drill bits of different diameters. This method offers advantages such as improved detection efficiency, reduced false detection rate, and the ability to track and locate abnormal parts.

[0006] This invention is achieved using the following technical solution:

[0007] A method for detecting broken drill bits in a drill bag includes the following steps:

[0008] S1. Import the barcode information of the board to be processed into the host computer, and set the coordinate value of the fiber optic sensor to move to the detection position in the host computer;

[0009] S2. Control the fiber optic sensor to move to the detection position. After the drill bag mechanism moves above the detection position, control several cutters to extend in sequence towards the detection position. If the extended cutter can block the light beam emitted by the fiber optic sensor, the host computer can receive the feedback signal from the fiber optic sensor and determine that the cutter is normal. Otherwise, the cutter is abnormal. After the cutter is retracted, the next cutter is moved above the detection position and the cutter is extended again. The detection is carried out in sequence. After all cutters have been detected, the host computer interface displays which cutters are abnormal.

[0010] S3. Query the abnormal parts processed by the abnormal tool through the host computer, obtain the barcode information of the abnormal parts, and locate the processing position of the abnormal parts based on the barcode information.

[0011] Furthermore, a tool extension time threshold is set on the host computer. If the host computer receives a feedback signal from the fiber optic sensor within the tool extension time threshold, it is determined that the tool is normal. If the feedback signal from the fiber optic sensor is not received after the tool extension time threshold has expired, it is determined that the tool is abnormal.

[0012] Furthermore, the fiber optic sensor is connected to a fiber optic amplifier. A tool diameter detection threshold is set in the fiber optic amplifier. When the extended tool blocks the light beam emitted by the fiber optic sensor, the fiber optic amplifier obtains the tool diameter threshold. If the tool diameter threshold is less than or equal to the tool diameter detection threshold within the set tool extension time threshold, it is determined that the tool is normal; otherwise, the tool is abnormal.

[0013] Furthermore, the cutter with the smallest diameter among several cutters to be tested is set as the cutter diameter detection threshold.

[0014] Furthermore, if an abnormal tool is detected, the host computer receives the tool breakage information and issues an alarm.

[0015] A drill bit breakage detection system includes a breakage detection device, a drill bit device, and a host computer. The breakage detection device includes a moving stage and a moving control unit that drives the moving stage to reciprocate horizontally. An optical fiber sensor is mounted on the moving stage and configured to form a sensing area on the moving stage. The drill bit device includes a drill bit mechanism, a first drill bit control unit that drives the drill bit mechanism to reciprocate horizontally, and a second drill bit control unit that drives the drill bit mechanism to reciprocate vertically. The drill bit mechanism includes a plurality of cutting tools and a plurality of cutting tool control units. Each cutting tool control unit drives a corresponding cutting tool to extend and retract vertically. The moving control unit, the first drill bit control unit, the second drill bit control unit, the cutting tool control unit, and the optical fiber sensor are electrically connected to the host computer.

[0016] Furthermore, the broken knife detection device also includes an optical fiber amplifier, which is mounted on a moving platform. The optical fiber sensor is connected to the optical fiber amplifier, and the optical fiber amplifier is connected to the host computer.

[0017] Furthermore, the broken blade detection device also includes an air-blowing solenoid valve and a broken blade I / O module. The fiber optic amplifier and the broken blade I / O module are connected in series in one direction for unidirectional control. The air-blowing solenoid valve is connected in series in one direction for unidirectional control. The air-blowing solenoid valve is located on one side of the fiber optic sensor.

[0018] Furthermore, the fiber optic sensor is a through-beam fiber optic sensor, which includes a transmitter and a receiver, and the line between the transmitter and receiver is perpendicular to the direction of motion of the mobile stage.

[0019] Furthermore, the tool control unit includes a cylinder, a tool I / O module, and a valve island. The tool I / O module and the valve island are connected in parallel for one-way control. The valve island and the cylinder are connected in parallel for one-way control. The cylinder is equipped with a magnetic switch, which feeds back the cylinder status to the tool I / O module. The tool I / O module and the host computer are connected in parallel for two-way control.

[0020] Compared with the prior art, the beneficial effects of the present invention include at least the following:

[0021] This invention utilizes the beam-blocking principle of fiber optic sensors. Through programmed control of the coordinated movement of the fiber optic sensor and the cutting tool, combined with tool extension action and position control, it can accurately detect whether cutting tools of different diameters in a drill bit are abnormal. The precise positioning of the fiber optic sensor and the cutting tool ensures reliable detection. Rapid location of abnormal cutting tools reduces subsequent processing losses of problematic boards, lowers the defect rate of finished boards, and improves quality control. The host computer implements anomaly traceability through barcode information association, preventing abnormal boards from entering the terminal and providing data support for timely tool replacement and processing parameter adjustment. Rapid positioning is achieved through unified coordinate settings, and the sequential tool extension detection method eliminates the need for a complex vision system, reducing hardware costs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the drill bit breakage detection system of Embodiment 2 of the present invention;

[0023] In the diagram: 11. Moving stage; 12. Fiber optic sensor; 13. Fiber optic amplifier; 21. Drilling mechanism. Detailed Implementation

[0024] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided to make the invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0025] The terms used to express position and direction in this invention are illustrated with reference to the accompanying drawings, but changes can be made as needed, and all such changes are included within the scope of protection of this invention.

[0026] Example 1

[0027] In existing technologies, the detection of broken tools on woodworking machine tools mainly relies on manual inspection, which suffers from low efficiency, poor accuracy, and insufficient real-time performance. Existing technologies such as cutting force sensors and machine vision are limited by factors such as narrow drill-bag space, large differences in tool diameter, and complex structures, making reliable detection difficult. For example, ordinary photoelectric sensors are prone to false detections or missed detections due to structural deformation, and cannot meet the detection needs of multi-tool drill-bags.

[0028] To address the aforementioned issues, a broken tool detection scheme adapted to the structural characteristics of the drill bag is needed. Traditional methods cannot achieve automatic detection of multiple tools within a limited space, and manual judgment is subject to subjective errors. Therefore, this application proposes a broken tool detection method for the drill bag, which includes the following steps:

[0029] S1. Import the barcode information of the board to be processed into the host computer, and set the coordinate value of the fiber optic sensor 12 to move to the detection position in the host computer;

[0030] S2. Control the fiber optic sensor 12 to move to the detection position. After the drill bag mechanism 21 moves above the detection position, control several cutters to extend in sequence towards the detection position. If the extended cutter can block the light beam emitted by the fiber optic sensor 12, the host computer can receive the feedback signal from the fiber optic sensor 12 and determine that the cutter is normal. Otherwise, the cutter is abnormal. After the cutter is retracted, the next cutter is moved above the detection position and the cutter is extended again. The detection is carried out in sequence. After all cutters have been detected, the host computer interface displays which cutters are abnormal.

[0031] S3. Query the abnormal parts processed by the abnormal tool through the host computer, obtain the barcode information of the abnormal parts, and locate the processing position of the abnormal parts based on the barcode information.

[0032] In this embodiment, the barcode information of the workpiece to be processed is first imported into the host computer. The host computer moves the fiber optic sensor 12 to the detection position according to the preset coordinate values. After the drill bit mechanism 21 moves the tool above the detection position, it controls each tool to extend downwards in sequence. If the tool is intact, it will block the beam of the fiber optic sensor 12 when it extends, triggering a feedback signal; if no signal is detected, it is determined to be a broken tool. After the detection is completed, the host computer interface displays the abnormal tool number and retrieves the workpiece processed by the abnormal tool, matching the corresponding workpiece barcode to locate its position in the processing queue.

[0033] Compared to traditional photoelectric detection, which requires individual sensor position adjustment for each tool, this invention utilizes the beam-blocking principle of the fiber optic sensor 12, combined with tool extension action and position control, to accurately detect abnormalities in tools of different diameters on the drill bit, eliminating the time delay and subjective errors of manual inspection. The precise positioning of the fiber optic sensor 12 and the tool ensures reliable detection, and the rapid location of abnormal tools reduces subsequent processing losses of problematic boards, lowers the defect rate of finished boards, and improves quality control. The host computer implements anomaly traceability through barcode information association, preventing abnormal boards from entering the terminal and providing data support for timely tool replacement and processing parameter adjustment. Furthermore, the unified coordinate setting enables rapid positioning, and the sequential tool extension detection method eliminates the need for a complex vision system, reducing hardware costs and solving the problem of multi-tool detection in confined spaces.

[0034] In a preferred embodiment, a tool extension time threshold is set in the host computer. If the host computer receives a feedback signal from the fiber optic sensor 12 within the tool extension time threshold, it is determined that the tool is normal. If the feedback signal from the fiber optic sensor 12 is not received after the tool extension time threshold has expired, it is determined that the tool is abnormal.

[0035] In this embodiment, the tool extension time threshold refers to a pre-set reference time range for determining whether the tool extension and retraction action is completed within a specified time. Specifically, it can be implemented using a timer module or software algorithm. By quantifying the response time interval of the tool extension and retraction action, the problem of misjudgment caused by mechanical delay or signal interference can be solved.

[0036] Specifically, the host computer can pre-store standard action time parameters for different tool types. When the tool extends downwards, the fiber optic sensor 12 simultaneously detects whether the light beam is blocked. If the tool extends normally without breaking, its tip will block the light beam within a preset stroke, and the fiber optic sensor 12 will send a feedback signal to the host computer within the tool extension time threshold. If the extension length is insufficient due to tool breakage, or the action timeout is caused by mechanical jamming, and the host computer still does not receive a signal within the tool extension time threshold, it determines that the tool is abnormal. This tool extension time threshold can be adjusted according to the difference in tool length. Compared with traditional tool breakage detection that relies on photoelectric switches triggered by fixed positions, which are prone to detection failure when the tool is slightly deformed or the installation position is offset. This invention uses a dual judgment mechanism of time and space dimensions, based on the collaborative judgment of the tool extension time threshold and action feedback, to accurately identify the tool status under complex working conditions. It can accommodate mechanical errors in the actual tool extension process and improve detection accuracy. For example, when the actual blocking position of the tool deviates from the theoretical position due to vibration, as long as the effective blocking action is completed within the tool extension time threshold, it can still be judged as a normal state, thereby reducing the false alarm rate and effectively solving the problem of misjudgment caused by mechanical structure errors in the detection of multiple tools in the drill bag.

[0037] In a preferred embodiment, the fiber optic sensor 12 is connected to a fiber optic amplifier 13. A tool diameter detection threshold is set in the fiber optic amplifier 13. When the extended tool blocks the light beam emitted by the fiber optic sensor 12, the fiber optic amplifier 13 acquires the tool diameter threshold. If the tool diameter threshold is less than or equal to the tool diameter detection threshold within the set tool extension time threshold, it is determined that the tool is normal; otherwise, the tool is abnormal.

[0038] In this embodiment, a tool diameter detection threshold is preset in the fiber optic amplifier 13. This threshold is the standard for determining whether the tool diameter meets the requirements. Detection process: The fiber optic sensor 12 emits a light beam. When a tool extends and blocks this beam, the fiber optic amplifier 13 acquires the preset diameter threshold corresponding to that tool. By comparing the actual detected tool obstruction of the beam with this threshold, it determines whether the tool diameter is within the acceptable range. If the tool is not broken, the tool diameter threshold for the tool that blocks the beam after extending is less than or equal to the tool diameter detection threshold. The fiber optic sensor 12 monitors the beam obstruction status in real time and determines the tool diameter corresponding to the obstructed area within the tool extension time threshold.

[0039] Traditional methods using a single time threshold or a fixed diameter threshold for detection are ill-suited to the needs of detecting tools of different sizes and are susceptible to false alarms due to environmental interference. This embodiment, by setting a tool diameter detection threshold combined with time constraints, not only accommodates the detection needs of tools of various sizes but also improves detection accuracy and reliability. It can accurately identify the fracture state of tools of different sizes, avoiding misjudgments caused by differences in tool size. Furthermore, the dual detection mechanism of time and diameter enhances the reliability of the detection results. For example, when inspecting a drill bag containing tools of various diameters, the system automatically uses the smallest tool diameter as the threshold, ensuring that all tools can be inspected based on a unified standard without the need for manual parameter adjustment.

[0040] As a preferred embodiment, the tool with the smallest diameter among a plurality of tools to be tested is set as the tool diameter detection threshold.

[0041] In this embodiment, the tool diameter detection threshold refers to a pre-set critical value for determining whether a tool is abnormal. This can be achieved by inputting parameters through the fiber optic amplifier 13. This tool diameter detection threshold serves as a benchmark for determining whether a tool meets normal operating conditions. The tool with the smallest diameter refers to the smallest tool among all tools to be inspected in the same batch or under the same processing conditions. Its diameter value can be used as a dynamically adjusted benchmark parameter, for example, by measuring or pre-setting a tool specification table to determine the actual value of the smallest tool.

[0042] Specifically, during the inspection process, when the tool extends and blocks the beam of the fiber optic sensor 12, the fiber optic amplifier 13 acquires the tool diameter data in real time. Since the tool diameter detection threshold is set to the minimum tool diameter value of the current batch, if the actual tool diameter is equal to or less than this threshold, the tool is considered normal; if the actual tool diameter is greater than this threshold, the tool is considered abnormal. By dynamically selecting the minimum diameter as the benchmark, it is ensured that all tools meet the minimum size requirements during inspection, avoiding misjudgments or missed detections due to differences in tool diameter. Traditional inspection methods typically use fixed thresholds or ignore differences in tool diameter, making it difficult to accurately determine abnormalities when tool sizes are inconsistent. For example, if the threshold is set too high, it cannot effectively detect the breakage of large-diameter tools; if the threshold is set too low, small-diameter tools are easily misjudged as abnormal. By dynamically associating the threshold with the minimum tool diameter, the inspection needs of different tool combinations can be adapted, eliminating detection deviations caused by size differences.

[0043] This invention provides a unified detection benchmark for cutting tools of different diameters, avoiding unreliable detection results due to differences in tool size. It is particularly suitable for scenarios where a tool group contains tools of various sizes. By dynamically adjusting the threshold, it ensures that abnormal states of all tools can be effectively identified, thereby improving detection accuracy and system adaptability.

[0044] In a preferred embodiment, if an abnormal tool is detected, the host computer receives the tool breakage information and issues an alarm.

[0045] In this embodiment, the broken tool information refers to the abnormal state signal determined by the obstruction relationship between the fiber optic sensor 12 and the tool. The alarm refers to the abnormal state prompting by means of an audible and visual alarm device or human-machine interface warning information, such as issuing an alarm sound through a buzzer, or popping up a red warning box on the operation interface and recording an abnormal log, so as to enable the operator to perceive the broken tool situation in real time.

[0046] Specifically, during the tool extension process, if the fiber optic sensor 12 does not detect the tool blocking the light beam, the host computer determines that the tool is abnormal according to preset logic, and then generates tool breakage information including the abnormal tool number and detection time. This information is transmitted to the alarm module through the communication interface, activating the alarm device to issue a warning signal. During this process, the host computer simultaneously records abnormal data, providing a basis for subsequent tool maintenance and abnormal component tracing.

[0047] Compared to existing technologies, traditional manual inspection methods rely on operators to periodically check tool status, which carries the risk of response delays and missed detections. This invention, through an automated detection and real-time alarm linkage mechanism, can trigger an alert the instant a tool malfunction occurs, effectively shortening fault response time. It achieves real-time monitoring and proactive alarm for broken tools, preventing continuous processing failures due to undetected broken tools. Operators can immediately stop equipment operation based on alarm information, promptly replace abnormal tools, prevent batch scrapping of processed parts and equipment damage, and reduce downtime for troubleshooting.

[0048] Example 2

[0049] refer to Figure 1 The present invention also provides a drill bit breakage detection system, including a breakage detection device, a drill bit device, and a host computer. The breakage detection device includes a moving stage 11 and a moving control unit that drives the moving stage 11 to reciprocate in the horizontal direction. The moving stage 11 is equipped with an optical fiber sensor 12, which is configured to form a sensing area on the moving stage 11. The drill bit device includes a drill bit mechanism 21, a first drill bit control unit that drives the drill bit mechanism 21 to reciprocate in the horizontal direction, and a second drill bit control unit that drives the drill bit mechanism 21 to reciprocate in the vertical direction. The drill bit mechanism 21 includes a plurality of cutting tools and a plurality of cutting tool control units. Each cutting tool control unit drives the corresponding cutting tool to extend and retract in the vertical direction. The moving control unit, the first drill bit control unit, the second drill bit control unit, the cutting tool control unit, and the optical fiber sensor 12 are electrically connected to the host computer.

[0050] In this embodiment, the mobile stage 11, driven by the motion control unit, moves the fiber optic sensor 12 to a preset detection position. The drill bag mechanism 21, driven by the first drill bag control unit, moves horizontally to directly above the detection position. Subsequently, the second drill bag control unit drives the drill bag mechanism 21 to descend vertically to the detection height. The tool control unit sequentially controls each tool to extend downwards by a preset length. If the tool is intact, its extension will block the light beam emitted by the fiber optic sensor 12, triggering a feedback signal transmission to the host computer. If the tool is broken or missing, the light beam is not blocked, and the host computer determines that the tool is abnormal. After all tools are detected, the host computer records the abnormal tool number and displays the detection results. During this process, the horizontal and vertical motion control units, the tool extension control unit, and the signal acquisition of the fiber optic sensor 12 are all centrally scheduled by the host computer, realizing a fully automated detection process.

[0051] The drill bit breakage detection system of the present invention is compatible with existing woodworking machine tool control systems, enabling intelligent tool breakage detection and alarm functions.

[0052] Existing broken tool detection devices typically employ spindle current monitoring or manual inspection, which are ill-suited for the independent detection of multiple tools in a drill bag and cannot operate stably in complex machining environments. This invention, however, utilizes a combination of fiber optic sensor 12 and a moving stage 11 to perform sequential detection of multiple tools within a confined space, avoiding the reliance on installation space required for machine vision or laser scanning technologies. The fiber optic sensor 12 directly determines the tool status through beam obstruction, without relying on tool diameter parameters, thus solving the detection challenge of multiple tool sizes coexisting. Centralized control of each motion unit by the host computer precisely coordinates the timing of detection actions, avoiding human error.

[0053] This invention, through the coordinated action of an adjustable, highly sensitive fiber optic sensor 12 and a mobile control unit, can quickly identify broken tools in complex machining environments and accurately detect abnormalities in tools of different diameters in the drill press. Centralized control of the detection process by the host computer ensures the detection sequence and accuracy of multiple tools, eliminating efficiency losses caused by manual intervention. The association mechanism between the abnormal tool number and the information of the machined sheet facilitates rapid tracing of problematic workpieces, reducing the production of defective products. It overcomes the technical shortcomings of traditional detection technologies, such as their inability to adapt to drill press structures and susceptibility to environmental interference, providing reliable support for the intelligent upgrading of woodworking machine tools.

[0054] It should be noted that the mobile control unit in this embodiment includes a servo drive device, a servo motor, a reducer, a position detection device and a speed detection device, a position feedback module, a speed feedback module, an anomaly detection device and an anomaly feedback module. The position feedback module, speed feedback module, and anomaly feedback module are bidirectionally connected in parallel with the host computer. The structure, control method, and connection method of the first drill bag control unit and the second drill bag control unit are the same as those of the mobile control unit.

[0055] In a preferred embodiment, the broken knife detection device further includes an optical fiber amplifier 13, which is mounted on the moving stage 11. The optical fiber sensor 12 is connected to the optical fiber amplifier 13, and the optical fiber amplifier 13 is connected to the host computer.

[0056] In this embodiment, the fiber optic amplifier 13 refers to a device used to receive the optical signal from the fiber optic sensor 12 and convert it into an electrical signal. Specifically, it can be implemented using a fiber optic amplifier 13 module with signal gain function. Signal amplification can improve the stability and anti-interference capability of the detection signal. The connection between the fiber optic amplifier 13 and the host computer means that the fiber optic amplifier 13 transmits the processed electrical signal to the host computer. This can be achieved using analog or digital communication interfaces, such as RS-485 or Ethernet communication protocols, to complete data interaction. This allows the host computer to obtain the status information of the fiber optic sensor 12 in real time.

[0057] Specifically, during the detection process, when the tool extends to the detection position, if the tool is not broken, its blade will block the light beam emitted by the fiber optic sensor 12. At this time, the fiber optic sensor 12 transmits the change in optical signal to the fiber optic amplifier 13. The fiber optic amplifier 13 amplifies and filters the signal and feeds the processed signal back to the host computer. The host computer determines whether the tool is abnormal based on the received signal status. For example, if the tool is broken and the light beam is not blocked, the fiber optic sensor 12 outputs a signal indicating no obstruction, and the host computer marks the tool as abnormal. Compared to directly using the raw signal from the fiber optic sensor 12 for judgment, which is prone to misjudgment due to environmental interference or signal attenuation, the introduction of the fiber optic amplifier 13 to enhance and optimize the signal effectively reduces noise interference during signal transmission and improves detection reliability. In addition, the direct connection between the fiber optic amplifier 13 and the host computer simplifies the signal processing link and shortens the system response time. This invention can significantly improve the accuracy and stability of broken tool detection, avoid false alarms or missed detections caused by signal interference or attenuation, and is especially suitable for multi-tool detection scenarios in complex woodworking machine tool processing environments.

[0058] In a preferred embodiment, the broken blade detection device further includes an air-blowing solenoid valve and a broken blade I / O module. The fiber optic amplifier 13 is connected in series with the broken blade I / O module for unidirectional control, and the air-blowing solenoid valve is connected in series with the broken blade I / O module for unidirectional control. The air-blowing solenoid valve is located on one side of the fiber optic sensor 12.

[0059] In this embodiment, during the tool extension detection process, the broken tool IO module synchronously controls the air blowing solenoid valve according to a preset timing sequence. Before the tool moves to the detection position, the air blowing solenoid valve is activated for pre-cleaning, using directional airflow to remove debris between the transmitter and receiver of the fiber optic sensor 12. During the tool extension process, the fiber optic sensor 12 continuously monitors the beam obstruction status, and the broken tool IO module triggers the air blowing solenoid valve again for post-cleaning after the detection cycle ends. Traditional broken tool detection systems do not have a cleaning device, which can easily lead to false alarms due to debris accumulation in a sawdust-splattered processing environment. This invention, by integrating a pneumatic cleaning unit, automatically removes interference from the sensor area before and after detection. Simultaneously, the use of an independent broken tool IO module achieves precise timing coordination between the cleaning action and the detection process, effectively solving the signal interference problem under complex working conditions. Furthermore, the unidirectional control series connection architecture avoids signal conflicts caused by parallel connection of multiple devices, improving system stability. This invention achieves dynamic cleaning of the sensor detection area, solving the technical problem of false judgments caused by debris obstruction in woodworking environments, while simplifying system wiring complexity through a modular control architecture. This solution significantly reduces equipment maintenance frequency while maintaining detection accuracy, and is especially suitable for drilling and machining scenarios with multiple tools and high dust levels.

[0060] In a preferred embodiment, the fiber optic sensor 12 is a through-beam fiber optic sensor 12, which includes a transmitter and a receiver, and the line between the transmitter and receiver is perpendicular to the movement direction of the moving stage 11.

[0061] The through-beam fiber optic sensor 12 is an optical detection device that generates a light beam through a transmitting end and receives the light beam through a receiving end. Specifically, it can be implemented using a separate fiber optic assembly with independent transmitting and receiving modules. It determines whether the tool has extended to the correct position by detecting whether the light beam is blocked. The line between the transmitting and receiving ends being perpendicular to the movement direction of the moving stage 11 means that the detection axis formed by their installation positions forms a 90-degree angle with the horizontal movement trajectory of the moving stage 11. This can be achieved by fixing the transmitting end to one edge of the moving stage 11 and the receiving end to the other edge. This arrangement can prevent vibrations or offsets generated during the movement of the moving stage 11 from interfering with the light beam detection.

[0062] Specifically, the transmitting end of the through-beam fiber optic sensor 12 continuously emits a light beam, and the receiving end monitors the beam intensity in real time. When the tool extends to the detection position, it blocks the optical path from the transmitting end to the receiving end, causing a decrease in the signal strength at the receiving end, thereby triggering a feedback signal. Since the line connecting the transmitting end and the receiving end is perpendicular to the movement direction of the moving stage 11, the position where the tool blocks the optical path is always on the same detection plane when the moving stage 11 moves horizontally, avoiding beam shift or misjudgment due to the displacement of the moving stage 11.

[0063] In some specific implementations, redundant detection areas are formed by setting up multiple sets of transmitters and receivers. For example, two sets of through-beam fiber optic sensors 12 are arranged in the same vertical plane to meet the detection requirements of tools with different diameters.

[0064] Compared to existing drill bit breakage detection methods that mostly use diffuse reflection photoelectric sensors, which rely on light signals reflected from the tool surface and are prone to misjudgment due to tool surface contamination, differences in reflectivity, or ambient light interference, this invention uses a through-beam fiber optic sensor 12 to directly detect the beam obstruction state. This eliminates reliance on tool surface characteristics and, through a vertically arranged detection axis, avoids positional errors in the movement direction of the moving stage 11, significantly improving detection stability and anti-interference capabilities. This invention solves the reliability problem caused by large differences in tool diameter and limited installation space in complex machining environments, achieving accurate identification of tools of various specifications. It also simplifies the sensor debugging process and avoids false alarms caused by mechanical deformation or vibration.

[0065] In a preferred embodiment, the tool control unit includes a cylinder, a tool I / O module, and a valve island. The tool I / O module and the valve island are connected in parallel for one-way control. The valve island and the cylinder are connected in parallel for one-way control. The cylinder is equipped with a magnetic switch, which feeds back the cylinder status to the tool I / O module. The tool I / O module is connected in parallel for two-way control with the host computer.

[0066] In this embodiment, when a tool needs to be inspected, the host computer sends a control command to the tool I / O module. Simultaneously, the tool I / O module outputs a control signal to the valve island. The valve island drives the cylinder piston by distributing air pressure. As the cylinder pushes the tool downwards, the magnetic switch monitors the piston position in real time and feeds back a status signal to the tool I / O module. If the cylinder fails to reach the predetermined position within the specified stroke, the tool I / O module immediately uploads the abnormal status to the host computer. After the tool inspection is completed, the host computer resets the control parameters of the tool I / O module through bidirectional communication, preparing for the next round of inspection. The closed-loop feedback system between the magnetic switch and the tool I / O module enables real-time monitoring of the tool extension and retraction status, ensuring the data accuracy of the broken tool inspection process. The bidirectional communication structure between the host computer and the tool I / O module allows the tool control parameters to be dynamically adjusted to adapt to the inspection requirements of tools of different sizes.

[0067] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the invention without departing from the principles and spirit of the invention, and all such changes should fall within the protection scope of the claims of the present invention.

Claims

1. A method for detecting broken drill bits in a drill bag, characterized in that, Includes the following steps: S1. Import the barcode information of the board to be processed into the host computer, and set the coordinate value of the fiber optic sensor (12) to move to the detection position in the host computer; S2. Control the fiber optic sensor (12) to move to the detection position. After the drill bag mechanism (21) moves above the detection position, control several cutters to extend in sequence toward the detection position. If the extended cutter can block the beam emitted by the fiber optic sensor (12), the host computer can receive the feedback signal from the fiber optic sensor (12) and determine that the cutter is normal. Otherwise, the cutter is abnormal. After the cutter is retracted, the next cutter is moved above the detection position and the cutter is extended again. The detection is carried out in sequence. After all the cutters are detected, the host computer interface displays which cutters are abnormal. S3. Query the abnormal parts processed by the abnormal tool through the host computer, obtain the barcode information of the abnormal parts, and locate the processing position of the abnormal parts based on the barcode information; The host computer sets a tool extension time threshold. If the host computer receives a feedback signal from the fiber optic sensor (12) within the tool extension time threshold, it is determined that the tool is normal. If the feedback signal from the fiber optic sensor (12) is not received after the tool extension time threshold has expired, it is determined that the tool is abnormal. The fiber optic sensor (12) is connected to a fiber optic amplifier (13). A tool diameter detection threshold is set in the fiber optic amplifier (13). When the extended tool blocks the light beam emitted by the fiber optic sensor (12), the fiber optic amplifier (13) obtains the tool diameter threshold. If the tool diameter threshold is less than or equal to the tool diameter detection threshold within the set tool extension time threshold, it is determined that the tool is normal; otherwise, the tool is abnormal.

2. The method for detecting broken drill bits according to claim 1, characterized in that, The smallest diameter tool among several tools to be tested is set as the tool diameter detection threshold.

3. The method for detecting broken drill bits according to claim 1, characterized in that, If an abnormal tool is detected, the host computer receives the tool breakage information and issues an alarm.

4. A drill bit breakage detection system, characterized in that, The method for detecting broken drill bits according to any one of claims 1-3, wherein the detection system includes a broken drill bit detection device, a drill bit device, and a host computer, wherein the broken drill bit detection device includes a moving stage (11) and a moving control unit that drives the moving stage (11) to reciprocate in the horizontal direction, wherein the moving stage (11) is provided with an optical fiber sensor (12), wherein the optical fiber sensor (12) is configured to form a sensing area on the moving stage (11), wherein the drill bit device includes a drill bit mechanism (21), a first drill bit control unit that drives the drill bit mechanism (21) to reciprocate in the horizontal direction, and a second drill bit control unit that drives the drill bit mechanism (21) to reciprocate in the vertical direction, wherein the drill bit mechanism (21) includes a plurality of cutting tools and a plurality of cutting tool control units, wherein each cutting tool control unit drives the corresponding cutting tool to extend and retract in the vertical direction, wherein the moving control unit, the first drill bit control unit, the second drill bit control unit, the cutting tool control unit, and the optical fiber sensor (12) are electrically connected to the host computer.

5. The drill bit breakage detection system according to claim 4, characterized in that, The broken knife detection device also includes an optical fiber amplifier (13), which is mounted on a mobile stage (11). The optical fiber sensor (12) is connected to the optical fiber amplifier (13), and the optical fiber amplifier (13) is connected to the host computer.

6. The drill bit breakage detection system according to claim 5, characterized in that, The broken knife detection device also includes an air blowing solenoid valve and a broken knife IO module. The fiber optic amplifier (13) is connected in series with the broken knife IO module in one-way control. The air blowing solenoid valve is connected in series with the broken knife IO module in one-way control. The air blowing solenoid valve is located on one side of the fiber optic sensor (12).

7. The drill bit breakage detection system according to claim 5, characterized in that, The fiber optic sensor (12) is a through-beam fiber optic sensor (12), which includes a transmitter and a receiver. The line between the transmitter and receiver is perpendicular to the direction of motion of the mobile stage (11).

8. The drill bit breakage detection system according to claim 4, characterized in that, The tool control unit includes a cylinder, a tool I / O module, and a valve island. The tool I / O module and the valve island are connected in parallel with one-way control. The valve island and the cylinder are connected in parallel with one-way control. The cylinder is equipped with a magnetic switch, which feeds back the cylinder status to the tool I / O module. The tool I / O module and the host computer are connected in parallel with two-way control.

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