High-safety-level protection method based on person and goods distinguishing and recognition
By deploying sensor arrays at automated production stations in factories, and combining shape recognition and time/sequence monitoring, safety protection devices can be dynamically controlled, solving the problem of distinguishing between personnel and materials in factories, improving the level of safety protection, and preventing device failure and tampering.
Patent Information
- Application Number
- CN202511103201.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-07
- Publication Date
- 2025-11-25
AI Technical Summary
In existing technologies, automated production in factories cannot effectively distinguish between personnel and materials, leading to the failure of safety protection devices and potentially causing safety accidents. Furthermore, photosensitive protection devices are easily tampered with and rendered ineffective.
Sensor arrays are deployed at the entrances and exits of automated production stations in the factory. The morphological recognition algorithm distinguishes between materials and personnel. Combined with time monitoring and sequence monitoring mechanisms, the activation and shutdown status of safety protection devices are dynamically controlled. Safety is ensured through light curtain verification and abnormal handling functions.
It improves the ability to distinguish between materials and personnel, prevents accidental triggering and tampering, ensures the effectiveness of safety protection devices, and reduces the risk of safety accidents.
Smart Images
Figure CN121008540A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of safety production technology, specifically a high-level safety protection method based on the differentiation and identification of people and goods. Background Technology
[0002] In automated production in factories, the inflow and outflow of semi-finished or finished products are unavoidable. Some key processes involve automated actions performed by robots, servo axes, and cylinders, typically designed as several workstations. Without strict protection for personnel entering and exiting these workstations, it's easy to imagine the serious safety accidents that could occur if personnel entered during automated machine operation. Current technology uses tunnel-shaped guardrails at the entrances and exits of conveyor lines, with a length of 850mm or more, to prevent personnel from entering. Some manufacturers use incoming material signals combined with photosensitive protection devices to disable the safety function when material is about to arrive, restoring it after the material has passed. However, while these photosensitive protection devices meet safety standards and provide personnel protection, they hinder production. To improve efficiency, on-site personnel might tamper with the protection devices, rendering them ineffective and thus compromising safety, potentially leading to accidents.
[0003] Therefore, traditional shielding safety solutions cannot guarantee that personnel will not enter with materials during the shielding period, thus avoiding danger. Furthermore, the effectiveness of incoming material signals and corresponding controllers cannot be guaranteed, meaning they may fail at any time. Once a failure occurs, a safety accident will be inevitable.
[0004] Therefore, there is an urgent need for a more reliable security protection technology. Summary of the Invention
[0005] The purpose of this application is to provide a high-security protection method based on human-goods differentiation and identification to solve the technical problems mentioned in the background above.
[0006] To achieve the above objectives, this application discloses the following technical solution: a high-security protection method based on human-goods differentiation and identification, the method comprising the following steps;
[0007] Sensor arrangement: Sensor arrays are arranged at the entrances and exits of automated production stations in the factory. The sensor arrays include at least two sensors for detecting the movement trajectory of materials or personnel within the station.
[0008] Material and personnel separation: The shape recognition algorithm of the sensor distinguishes between materials and personnel. The shape recognition algorithm is based on the differences between materials and personnel in terms of size, movement speed and shape characteristics.
[0009] Start-stop control: according to the sensor detection result, dynamically control the start-stop state of the safety protection device of the work station, including:
[0010] When detecting that the material enters the work station, start the light curtain shielding function, allow the material to pass and temporarily close the safety protection device;
[0011] When detecting that the personnel enters the work station, activate the safety protection device to prevent the automatic action of the dangerous area;
[0012] Light curtain verification: verify the effectiveness of the light curtain shielding function through a time monitoring mechanism or a sequence monitoring mechanism, so as to allow only the material to pass during the safety light curtain shielding, and prevent personnel from following the material into the dangerous area;
[0013] Abnormality disposal: when the light curtain shielding function is started, if an abnormality is detected, trigger the material blocking and dredging function to allow the material to complete the passing under safe conditions.
[0014] As preferred, the sensor array includes at least one of the following configurations:
[0015] Four parallel arranged sensors S1-S4, through a time monitoring mechanism or a sequence monitoring mechanism to transport the materials on both sides, wherein the sensor S1 and the sensor S2 are arranged in front of the safety protection device, and the sensor S3 and the sensor S4 are arranged behind the safety protection device;
[0016] Two T-shaped arranged sensors S1-S2, through cross shielding to transport the materials on both sides, wherein the sensor S1 and the sensor S2 are arranged in a T-shaped cross manner, and the cross point is located behind the safety light curtain in the direction of the dangerous area;
[0017] Two L-shaped arranged sensors S1-S2, through shielding in the direction of the single side outlet to transport the materials, wherein the sensor S1 and the sensor S2 are both located in front of the safety light curtain in the direction of the dangerous area outlet;
[0018] Two pairs of parallel arranged sensors S1-S4, through a time monitoring mechanism to synchronously transport the materials on both sides, wherein the sensor S1 and the sensor S2 are arranged in front of the safety protection device, and the sensor S3 and the sensor S4 are arranged behind the safety protection device.
[0019] As preferred, the four parallel arranged sensors S1-S4 meet:
[0020] The distance d1 between the sensor S1 and the sensor S2 is greater than 250 mm, the distance d2 between the sensor S2 and the protection area of the safety guard, and the distance d3 between the sensor S3 and the protection area of the safety guard are all less than 200 mm, and the distance d5 between the sensor S1 and the sensor S4 is greater than 500 mm and less than the length d6 of the material to be transported.
[0021] Preferably, the two T-shaped sensors S1-S2 satisfy:
[0022] The distance d7 between the intersection of the sensor protection area and the sensors S1 and S2 is less than or equal to 200 mm, and the minimum distance d8 between the photoelectric element protection areas is greater than or equal to the product of the transportation speed v and the response time of the safety guard, and d8 is less than 250 mm; wherein the sensor protection area is a rectangular light beam array area formed by the light emitter and the light receiver of the safety light curtain, and the photoelectric element protection area is the light beam detection range of the sensors S1 and S2.
[0023] Preferably, the two L-shaped sensors S1-S2 satisfy:
[0024] The distance d10 between the sensor protection area and the sensor S1 is greater than or equal to the product of the transportation speed v and the response time of the safety guard, and d10 is less than 250 mm, and the sum of d10 and the distance d11 between the sensors S1 and S2 is less than the length d6 of the material to be transported, wherein the sensor protection area is a rectangular light beam array area formed by the light emitter and the light receiver of the safety light curtain.
[0025] Preferably, the two pairs of parallel sensors S1-S4 satisfy:
[0026] The distance d12 between the sensors S1-S2 and the sensor protection area, and the distance d13 between the sensor protection area and the sensors S3-S4 are both greater than or equal to the product of the transportation speed v and the response time of the safety guard, and d12 and d13 are both less than 250 mm, the distance d14 between the sensor pair S1 and S2 and the sensor pair S3 and S4 is greater than 500 mm and d14 is less than the length d6 of the material to be transported, wherein the sensor protection area is a rectangular light beam array area formed by the light emitter and the light receiver of the safety light curtain.
[0027] Preferably, the time monitoring mechanism includes the following steps:
[0028] Start time limit: the activation time interval of the sensor set in front of the safety guard is not more than 4 seconds;
[0029] The sensor arranged in front of the safety device needs to continuously detect the movement of the material within a maintenance time;
[0030] Guard time control: if the time threshold is exceeded, the light curtain shielding function is terminated.
[0031] As a preferred, the sequence monitoring mechanism comprises the following steps:
[0032] The activation sequence of the sensors S1, S2, S3 and S4 verifies the movement direction of the material, and if the sequence is wrong, the light curtain shielding function is immediately terminated;
[0033] During the sequence monitoring, additional monitoring of the interruption of the sensor signal is performed to prevent personnel from bypassing the safety protection by interfering with the sensor signal.
[0034] As a preferred, the material blocking and dredging function comprises the following steps:
[0035] When the material is long-stopped in the safety light curtain area, the safety logic control signal is used to forcibly complete the safety light curtain cycle;
[0036] The safety logic control signal remains effective until the material completely passes through the dangerous area;
[0037] Before the device is reset, the system automatically locks the light curtain shielding function to prevent repeated triggering.
[0038] As a preferred, before the human and cargo differentiation step, the method further comprises:
[0039] Light curtain control: the configuration type of the light curtain scheme is selected by the DIP switch, and the signal logic processing of the sensor array is completed based on the configuration type, and is output to the safety control system.
[0040] Beneficial effects: the high-safety-level protection method based on human and cargo differentiation recognition of the present application verifies the material passing time through time monitoring and verifies the sensor activation sequence through sequence monitoring, and combines with the shape recognition algorithm to improve the differentiation ability of the material and the personnel, avoid the false triggering problem of the traditional fixed logic, and solve the core problems existing in the traditional scheme in human and cargo differentiation, tamper-proofing, material blocking and dredging, etc. BRIEF DESCRIPTION OF DRAWINGS
[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.
[0042] Figure 1A flowchart of a high-security protection method based on human and cargo identification provided by the embodiment of the present application is shown in the figure;
[0043] Figure 2 A schematic diagram of the arrangement of four sensors arranged in parallel provided by the embodiment of the present application is shown in the figure;
[0044] Figure 3 A schematic diagram of the arrangement of two T-shaped sensors provided by the embodiment of the present application is shown in the figure;
[0045] Figure 4 A schematic diagram of the arrangement of two L-shaped sensors provided by the embodiment of the present application is shown in the figure;
[0046] Figure 5 A schematic diagram of the arrangement of two pairs of sensors arranged in parallel provided by the embodiment of the present application is shown in the figure. DETAILED DESCRIPTION
[0047] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.
[0048] In this document, the term "comprising" is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or further includes elements inherent to such a process, method, article or device. Without more limitations, the elements defined by the statement "comprising" do not exclude the presence of other identical elements in the process, method, article or device including the elements.
[0049] The embodiment mainly adopts a high-security protection method based on human and cargo identification, which includes a sensor arrangement step, a light curtain control step, a human and cargo identification step, a start-stop control step, a light curtain verification step and an exception handling step. The purpose is to solve the core problems existing in the traditional scheme in human and cargo identification, tamper protection, material blocking and dredging, etc. through logical processing of sensor signals (i.e. time monitoring, sequence monitoring, material continuity verification) and automatic light curtain management.
[0050] In detail, the sensor arrangement step specifically includes: arranging a sensor array at the import and export of the factory automation production station, the sensor array including at least two sensors for detecting the movement trajectory of materials or personnel in the station.
[0051] In the embodiment, the sensor array includes at least one of the following configuration modes:
[0052] Four parallel sensors S1-S4, through time monitoring mechanism or sequence monitoring mechanism for both sides of the material conveying, wherein, as shown in Figure 2 Sensor S1 and sensor S2 are arranged in front of the safety guard, and sensor S3 and sensor S4 are arranged behind the safety guard;
[0053] Two T-shaped sensors S1-S2, through cross shielding for both sides of the material conveying, wherein, as shown in Figure 3 Sensor S1 and sensor S2 are arranged in a T-shaped cross manner, and the cross point is located behind the safety light curtain in the direction of the dangerous area;
[0054] Two L-shaped sensors S1-S2, through single side outlet direction shielding for material conveying, wherein, as shown in Figure 4 Sensor S1 and sensor S2 are located in front of the safety light curtain in the outlet direction of the dangerous area;
[0055] Two pairs of parallel sensors S1-S4, through time monitoring mechanism for both sides of the material synchronous conveying, wherein, as shown in Figure 5 Sensor S1 and sensor S2 are arranged in front of the safety guard, and sensor S3 and sensor S4 are arranged behind the safety guard.
[0056] Among them, the four parallel sensors S1-S4 meet:
[0057] The distance d1 between the sensor S1 and the sensor S2 is greater than 250mm, the distance d2 between the sensor S2 and the safety guard protection area, and the distance d3 between the sensor S3 and the safety guard protection area are all less than 200mm, the distance d5 between the sensor S1 and the sensor S4 is greater than 500mm and less than the length d6 of the material to be transported.
[0058] Among them, the two T-shaped sensors S1-S2 meet:
[0059] The distance d7 between the sensor protection area and the intersection point of the sensor S1 and the sensor S2 is less than or equal to 200mm, the minimum distance d8 between the photoelectric element protection areas is greater than or equal to the product of the transportation speed v and the response time of the safety protection equipment, and d8 is less than 250mm; wherein, the sensor protection area is a rectangular light beam array area formed by the light emitter and the light receiver of the safety light curtain, and the photoelectric element protection area is the light beam detection range of the sensor S1 and the sensor S2.
[0060] Among them, the two L-shaped sensors S1-S2 meet:
[0061] The distance d10 between the sensor protection area and the sensor S1 is greater than or equal to the product of the transport speed v and the response time of the safety guard, and d10 is less than 250 mm, and the sum of d10 and the distance d11 between the sensors S1 and S2 is less than the length d6 of the material to be transported, wherein the sensor protection area is a rectangular light beam array area formed by the light emitter and the light receiver of the safety light curtain.
[0062] The two pairs of sensors S1-S4 arranged in parallel satisfy:
[0063] The distance d12 between the sensors S1-S2 and the sensor protection area, and the distance d13 between the sensor protection area and the sensors S3-S4 are greater than or equal to the product of the transport speed v and the response time of the safety guard, and d12 and d13 are less than 250 mm, and the distance d14 between the sensor pair S1 and S2 and the sensor pair S3 and S4 is greater than 500 mm and less than the length d6 of the material to be transported, wherein the sensor protection area is a rectangular light beam array area formed by the light emitter and the light receiver of the safety light curtain.
[0064] In the embodiment, the time monitoring mechanism includes the following steps:
[0065] Start time limit: the activation time interval of the sensors (i.e., the sensors S1 and S2) arranged in front of the safety guard is not more than 4 seconds;
[0066] The sensors (i.e., the sensors S3 and S4) arranged in front of the safety guard need to continuously detect the movement of the material within the maintenance time;
[0067] Guard time control: if the time threshold is exceeded, the light curtain shielding function is terminated.
[0068] In the embodiment, the sequence monitoring mechanism includes the following steps:
[0069] The activation sequence of the sensors S1, S2, S3, and S4 verifies the movement direction of the material, and if the sequence is incorrect, the light curtain shielding function is immediately terminated;
[0070] During the sequence monitoring, additional monitoring of the interruption of the sensor signal is performed to prevent personnel from bypassing the safety guard by interfering with the sensor signal.
[0071] In detail, the light curtain control step specifically includes: selecting the configuration type (time monitoring, sequence monitoring, T-shaped or L-shaped configuration) of the light curtain scheme through the dial switch, completing the signal logic processing of the sensor array based on the configuration type, and outputting to the safety control system. The safety control system refers to an execution unit of integrated hardware (such as a Muting (safety light curtain) control box and a safety PLC) and software logic, which realizes dynamic control and logic verification of safety protection devices in an automated production station. The signal logic processing of the sensor array refers to real-time analysis, judgment and processing of the original signals collected by the sensor through a hardware circuit, algorithm or controller to verify the movement state of the material or personnel and output the result to the safety control system. The core goal is to ensure the logic consistency of the sensor signals, thereby dynamically controlling the start and stop of the protection device (such as the light curtain and the safety scanner) to ensure production safety.
[0072] In detail, the human-material distinction step specifically includes: distinguishing the material and personnel through the shape recognition algorithm of the sensor, which is based on the differences in size, movement speed and shape characteristics between the material and the personnel.
[0073] In detail, the start-stop control step specifically includes: dynamically controlling the start-stop state of the safety protection device of the station according to the sensor detection result, including:
[0074] When it is detected that the material enters the station, the light curtain shielding function is started, allowing the material to pass and temporarily closing the safety protection device;
[0075] When it is detected that the personnel enter the station, the safety protection device is activated to prevent the automatic action of the dangerous area.
[0076] In detail, the light curtain verification step specifically includes: verifying the effectiveness of the light curtain shielding function through a time monitoring mechanism or a sequence monitoring mechanism, so that only the material is allowed to pass during the safety light curtain shielding period, and the personnel are prevented from following the material into the dangerous area.
[0077] In detail, the abnormality handling step specifically includes: when the light curtain shielding function is started, if an abnormality (such as material jamming) is detected, triggering the jamming dredging function to allow the material to pass under safe conditions.
[0078] Feasibly, the jamming dredging function includes the following steps:
[0079] When the material is stationary in the safety light curtain area for a long time, the safety logic control signal is used to forcibly complete the safety light curtain period; the safety logic control signal is a safety logic control signal used to forcibly end the safety light curtain shielding period, and the core goal is to ensure the safe passage of the material through the dangerous area through manual or automatic intervention in the case of material jamming or other abnormality, while avoiding the safety risk caused by the failure of the light curtain shielding function;
[0080] The safety logic control signal is continuously valid until the material completely passes through the dangerous area;
[0081] Before the device is reset, the system automatically locks the light curtain shielding function to prevent repeated triggering.
[0082] In summary, the high-safety-level protection method based on human and cargo distinction recognition has the following technical features:
[0083] (1) By time monitoring (verifying the passing time of the material) and sequence monitoring (verifying the activation sequence of the sensor), combined with the shape recognition algorithm, the distinction ability of the material and the personnel is significantly improved, and the false triggering problem of the traditional fixed logic is avoided. For example, in a T-shaped configuration, if the material does not cover the intersection of the sensor (d8≥v×response time) within the set time, the system automatically triggers the safety logic control signal to prevent personnel from bypassing the detection.
[0084] (2) Based on time monitoring, sequence monitoring, T-shaped / L-shaped configuration and other muting schemes, a multi-dimensional logic verification is formed to reduce the risk of single failure point. By quickly switching the dial switch, different working condition requirements are adapted, and the safety logic control signal mechanism is integrated. When an abnormality is detected, the light curtain shielding period is forcibly terminated to prevent human interference with the sensor signal.
[0085] (3) When the material is blocked, the system automatically outputs the safety logic control signal to forcibly complete the light curtain shielding period without manual intervention, reduces the downtime, and locks the light curtain shielding function before the device is reset to avoid safety risks caused by false operation or signal interference.
[0086] In the embodiments provided by the present application, it should be understood that the embodiments described herein can be realized by hardware, software, firmware, middleware, codes or any proper combination thereof. For hardware implementation, the processor can be realized in one or more of the following components: an application specific integrated circuit (ASIC), a digital signal processor (DSP), a digital signal processing device (DSPD), a programmable logic device (PLD), a field programmable gate array (FPGA), a processor, a controller, a microcontroller, a microprocessor, other electronic units designed to perform the functions described herein, or a combination thereof. For software implementation, the procedures described herein can be implemented with a computer program that is written in any suitable programming language. The program can be stored in a computer readable storage medium or transmitted as one or more instructions or codes on the computer readable storage medium. The computer readable storage medium includes any storage medium that can be accessed by a computer. The computer readable storage medium can include but is not limited to the following media: a RAM, a ROM, an EEPROM, a CD-ROM or other optical disc storage, a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program codes in the form of instructions or data structures and can be accessed by a computer.
[0087] Finally, it should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, modifications or equivalent replacements of some technical features described in the foregoing embodiments can be made by those skilled in the art, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A high-security level protection method based on human-cargo discrimination recognition, characterized in that, The method comprises the following steps: Sensor arrangement: arranging a sensor array at the entrance and exit of the factory automation production station, the sensor array comprising at least two sensors for detecting the movement trajectory of materials or personnel in the station; Material-personnel distinction: distinguishing materials from personnel through a sensor form recognition algorithm based on the differences in size, movement speed and shape characteristics of materials and personnel; Start-stop control: dynamically controlling the start-stop state of the safety protection device of the station according to the sensor detection results, including: When detecting that materials enter the station, starting the light curtain shielding function to allow materials to pass and temporarily close the safety protection device; When detecting that personnel enter the station, activating the safety protection device to prevent automatic action in the dangerous area; Light curtain verification: verifying the effectiveness of the light curtain shielding function through a time monitoring mechanism or a sequence monitoring mechanism to allow only materials to pass during the safety light curtain shielding and prevent personnel from following materials into the dangerous area; Abnormality disposal: when the light curtain shielding function is started, if an abnormality is detected, triggering the material blocking and guiding function to allow materials to pass under safe conditions.
2. The high security level protection method based on human-cargo discrimination recognition according to claim 1, characterized in that, The sensor array comprises at least one of the following configurations: Four parallel sensors S1-S4 for conveying materials on both sides through a time monitoring mechanism or a sequence monitoring mechanism, wherein the sensor S1 and the sensor S2 are arranged in front of the safety protection device, and the sensor S3 and the sensor S4 are arranged behind the safety protection device; Two T-shaped sensors S1-S2 for conveying materials on both sides through cross shielding, wherein the sensor S1 and the sensor S2 are arranged in a T-shaped cross manner, and the intersection point is located behind the safety light curtain in the direction of the dangerous area; Two L-shaped sensors S1-S2 for conveying materials through shielding in the direction of the single-side outlet, wherein the sensor S1 and the sensor S2 are both located in front of the safety light curtain in the outlet direction of the dangerous area; Two pairs of parallel sensors S1-S4 for synchronously conveying materials on both sides through a time monitoring mechanism, wherein the sensor S1 and the sensor S2 are arranged in front of the safety protection device, and the sensor S3 and the sensor S4 are arranged behind the safety protection device.
3. The high security level protection method based on human-cargo discrimination recognition according to claim 2, characterized in that, The four parallel sensors S1-S4 satisfy: The distance d1 between the sensor S1 and the sensor S2 is greater than 250 mm, the distance d2 between the sensor S2 and the protection area of the safety protection device, and the distance d3 between the sensor S3 and the protection area of the safety protection device are all less than 200 mm, and the distance d5 between the sensor S1 and the sensor S4 is greater than 500 mm and less than the length d6 of the material to be conveyed.
4. The high security level protection method based on human-cargo discrimination recognition according to claim 2, characterized in that, The two T-shaped sensors S1-S2 satisfy: The distance d7 between the intersection of the sensor protection area and the sensors S1 and S2 is less than or equal to 200 mm, the minimum distance d8 between the photoelectric element protection areas is greater than or equal to the product of the transportation speed v and the response time of the safety protection device, and d8 is less than 250 mm; wherein the sensor protection area is a rectangular light beam array area formed by the light emitter and the light receiver of the safety light curtain, and the photoelectric element protection area is the light beam detection range of the sensors S1 and S2.
5. The high security level protection method based on human-cargo discrimination recognition of claim 2, wherein, The two L-shaped sensors S1-S2 satisfy: The distance d10 between the sensor protection area and the sensor S1 is greater than or equal to the product of the transportation speed v and the response time of the safety protection device, and d10 is less than 250 mm, and the sum of d10 and the distance d11 between the sensors S1 and S2 is less than the length d6 of the material to be transported, wherein the sensor protection area is a rectangular light beam array area formed by the light emitter and the light receiver of the safety light curtain.
6. The high security level protection method based on human-cargo discrimination recognition of claim 2, wherein, The two pairs of parallel sensors S1-S4 satisfy: The distances d12 between the sensors S1-S2 and the sensor protection area and the distances d13 between the sensor protection area and the sensors S3-S4 are both greater than or equal to the product of the transportation speed v and the response time of the safety protection device, and d12 and d13 are both less than 250 mm, the distance d14 between the sensor pair S1 and S2 and the sensor pair S3 and S4 is greater than 500 mm and d14 is less than the length d6 of the material to be transported, wherein the sensor protection area is a rectangular light beam array area formed by the light emitter and the light receiver of the safety light curtain.
7. The high security level protection method based on human-cargo discrimination recognition according to claim 1 or 2, characterized in that, The time monitoring mechanism includes the following steps: Start time limit: the activation time interval of the sensor arranged in front of the safety protection device is not more than 4 seconds; The sensor arranged in front of the safety protection device needs to continuously detect material movement within the maintenance time; Protection time control: if the time threshold is exceeded, the light curtain shielding function is terminated.
8. The high security level protection method based on human-cargo discrimination recognition of claim 2, wherein, The sequence monitoring mechanism includes the following steps: The activation sequence of the sensors S1, S2, S3 and S4 verifies the movement direction of the material, and if the sequence is incorrect, the light curtain shielding function is immediately terminated; During sequence monitoring, additional monitoring of sensor signal interruptions is performed to prevent personnel from bypassing the safety protection by interfering with the sensor signal.
9. The high security level protection method based on human-cargo discrimination recognition of claim 1, wherein, The material blocking and dredging function includes the following steps: When the material is stationary in the safety light curtain area for a long time, the safety logic control signal is used to forcibly complete the safety light curtain cycle; The safety logic control signal remains effective until the material completely passes through the dangerous area; Before the device is reset, the system automatically locks the light curtain shielding function to prevent repeated triggering.
10. The high security level protection method based on human-cargo discrimination recognition of claim 1, wherein, Before the human-cargo distinguishing step, the method further includes: Light curtain control: select the configuration type of the light curtain scheme through the DIP switch, perform signal logic processing of the sensor array based on the configuration type, and output to the safety control system.