Safety light curtain capable of realizing sequential detection

Abstract

The utility model discloses a safety light curtain capable of realizing sequential detection, which comprises a three-dimensional frame, and an A-side double-sensor assembly, a light curtain main body and a B-side double-sensor assembly are sequentially mounted in the X-axis direction of the three-dimensional frame; the light curtain main body comprises an infrared transmitting module and an infrared receiving module which are oppositely mounted on the three-dimensional frame along a Z axis; each of the A-side double-sensor assembly and the B-side double-sensor assembly comprises two reflective laser sensors which are arranged at intervals along the X axis, and the reflective laser sensors are located in the space between the two sides of the infrared transmitting module and the infrared receiving module; the controller is electrically connected with the reflective laser sensor, judges the motion direction of the object according to the reflective laser sensor, and is electrically connected with the light curtain main body to control output signals to realize sequential detection. Through cooperative work of the A / B side double-sensor group and the controller, accurate judgment and selective alarm of the motion direction of an object are realized, and the industrial production efficiency is remarkably improved while the safety is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to a safety light curtain, especially a safety light curtain capable of realizing sequential detection. BACKGROUND

[0002] Traditional safety light curtains are widely used in industrial production to detect the entry of foreign objects, triggering safety mechanisms (such as stopping equipment operation) to ensure the safety of personnel and equipment. However, existing safety light curtains usually adopt a simple light beam obstruction detection principle, that is, as long as the light beam is obstructed, the light curtain will trigger an alarm output regardless of which side the foreign object enters the photoelectric area. Although this design is simple and reliable, it has obvious limitations in some actual production scenarios.

[0003] For example, on some automated production lines, it may be necessary to allow objects to enter the light curtain area from a specific direction (such as side A) without triggering an alarm, while triggering an alarm immediately when entering from another direction (such as side B). Traditional safety light curtains cannot distinguish the direction of object movement, resulting in unnecessary shutdown of objects passing in the allowed direction, which seriously affects production efficiency. In addition, frequent false triggering can also increase equipment wear and maintenance costs.

[0004] To address this issue, the existing technology has not yet proposed a safety light curtain solution that can effectively distinguish the direction of object movement and implement selective alarm. Therefore, there is an urgent need for a new safety light curtain technology that can shield the alarm function in a specific direction while maintaining high sensitivity for safety detection in another direction, thereby balancing production efficiency and safety. SUMMARY

[0005] To solve the above technical problems, the utility model provides a safety light curtain capable of realizing sequential detection.

[0006] To solve the above technical problems, the utility model adopts the technical scheme of a safety light curtain capable of realizing sequential detection, comprising a three-dimensional frame, an A-side double sensor assembly, a light curtain main body, and a B-side double sensor assembly are installed in the X-axis direction of the three-dimensional frame in sequence.

[0007] The light curtain main body comprises an infrared emission module and an infrared receiving module installed oppositely along the Z-axis on the three-dimensional frame; the A-side double sensor assembly and the B-side double sensor assembly each comprise two reflective laser sensors arranged along the X-axis at intervals, and the reflective laser sensors are located within the interval space on both sides of the infrared emission module and the infrared receiving module;

[0008] It further comprises a controller installed on the three-dimensional frame, the controller is electrically connected to the reflective laser sensors to determine the direction of object movement according to the reflective laser sensors, and the controller is electrically connected to the signal output by the light curtain main body to realize sequential detection.

[0009] Further, the light curtain body is installed on the L-shaped support of the middle top of the three-dimensional frame along the Y-axis, and the infrared emission module and the infrared receiving module are fixedly connected with the straight angle of the L-shaped support.

[0010] Further, the A-side double sensor assembly and the B-side double sensor assembly are located on the T-shaped stand arranged on the same side of the three-dimensional frame.

[0011] Further, the reflective laser sensor is arranged in the perforation of the horizontal plate of the T-shaped stand.

[0012] Further, the upper end surface of the horizontal plate of the T-shaped stand is flush with the upper end surface of the L-shaped support.

[0013] Further, the cross beam is arranged between the T-shaped stands arranged on the same side, and the cross beam is extended and connected to the column of the L-shaped support of the three-dimensional frame.

[0014] The utility model discloses a safety light curtain capable of realizing sequential detection, and provides a safety light curtain capable of realizing sequential detection, which has the following remarkable advantages:

[0015] Through the cooperative work of the A-side and B-side double sensor assemblies and the intelligent judgment of the controller, the movement direction of the object can be accurately recognized, and the design solves the limitation that the traditional safety light curtain cannot distinguish the direction, realizes selective response to the movement in a specific direction, and significantly reduces the probability of false triggering.

[0016] In the automatic production scene, the object in a specific direction is allowed to pass without triggering the stop, unnecessary stop caused by the bidirectional detection of the traditional light curtain is avoided, the production efficiency can be improved by more than 40%, and the equipment wear and maintenance cost are reduced.

[0017] The rigid structure design of the three-dimensional frame, the L-shaped support and the T-shaped stand ensures the accurate alignment and long-term stability of the infrared emission / receiving module and the reflective laser sensor. The connection of the cross beam further enhances the overall vibration resistance, adapts to complex industrial environments, facilitates the installation, debugging and maintenance of the components, the downhole installation of the sensor and the unified detection plane layout optimize the space utilization, and reduce external interference.

[0018] The controller realizes high-precision direction recognition and safety signal output through the double detection mechanism of "time sequence judgment + light curtain verification". The programmable logic supports flexible parameter setting and adapts to the needs of different production lines. DRAWINGS

[0019] Figure 1 It is a three-dimensional structure schematic view of the utility model.

[0020] Figure 2 is a front view of the utility model.

[0021] In the figure: 100, a three-dimensional frame; 200, A-side double sensor assembly; 300, light curtain main body; 400, B-side double sensor assembly; 500, controller; 101, L-shaped support; 102, T-shaped stand; 103, crossbeam; 301, infrared emission module; 302, infrared receiving module; 01, reflective laser sensor. DETAILED DESCRIPTION

[0022] The utility model will be further explained in detail in combination with the drawings and specific embodiments.

[0023] In this embodiment, Figure 1 and 2 The safety light curtain capable of realizing sequential detection shown in the figure comprises a three-dimensional frame 100, which provides a physical installation platform as a base body of the overall device, ensures accurate positioning and stable fixation of various components in X, Y and Z axial directions, and is linearly arranged with an A-side double sensor assembly 200, a light curtain main body 300 and a B-side double sensor assembly 400 in the X axial direction of the three-dimensional frame 100; the A-side double sensor assembly 200, the light curtain main body 300 and the B-side double sensor assembly 400 synergistically act in the safety light curtain of the utility model and jointly realize the functions of direction recognition and safety detection.

[0024] Specifically, the light curtain main body 300 as a core detection unit is composed of an infrared emission module 301 and an infrared receiving module 302, which detects the entry of an object into a protection area through the shielding of an infrared light beam to trigger a basic safety signal. The light curtain main body 300 is installed on the L-shaped support 101 horizontally arranged along the Y axis at the top of the middle part of the three-dimensional frame 100, and the light curtain main body 300 comprises the infrared emission module 301 and the infrared receiving module 302 oppositely installed along the Z axis on the three-dimensional frame 100; the infrared emission module 301 and the infrared receiving module 302 are fixedly connected with the straight angle side of the L-shaped support 101. The L-shaped support 101 is horizontally arranged at the top of the middle part of the three-dimensional frame along the Y axis, so that the infrared emission / receiving module (301 / 302) can be oppositely installed along the Z axis to form a light curtain detection surface in the vertical direction. This layout maximizes the use of the top space of the three-dimensional frame, ensures that the infrared light beam can completely cover the area (such as the equipment entrance or the dangerous area) that needs to be protected, and at the same time avoids the interference of other components of the frame on the light beam. By fixing the infrared module through the straight angle side of the L-shaped support, the mechanical advantage of the straight angle structure is utilized: the straight angle side can provide bidirectional (horizontal and vertical) support for the module, reduce the displacement caused by vibration or external force, and ensure the long-term accurate alignment of the light beam. The installation at the top of the support also avoids the collision risk that may be caused by the installation on the ground or the side, and the fixation can be realized through a screw plug. At the same time, the open design of the L-shaped support facilitates the installation, debugging and maintenance of the infrared module.

[0025] In other embodiments, a slide can be provided on the L-shaped bracket, and a slider sliding on the slide can be used to dynamically adjust the position of the module.

[0026] In this embodiment, the A-side double sensor assembly 200 and the B-side double sensor assembly 400 are located on the T-shaped stands 102 arranged on the same side of the stereoscopic frame 100. The A-side double sensor assembly 200 and the B-side double sensor assembly 400 each include two reflective laser sensors 01 arranged along the X axis. The reflective laser sensors 01 are located in the spacing space on both sides of the infrared emission module 301 and the infrared receiving module 302. In a specific installation position, the reflective laser sensors 01 are arranged in the perforated horizontal plate of the T-shaped stand 102. The upper end surface of the horizontal plate of the T-shaped stand 102 is flush with the upper end surface of the L-shaped bracket 101. The T-shaped stands 102 arranged on the same side are connected by a cross beam 103, which extends to the column supporting the L-shaped bracket 101. The reflective laser sensors 01 are arranged in the perforated horizontal plate of the T-shaped stand 102, so that the detection area of the sensor is concentrated in the spacing space on both sides of the light curtain body 300, avoiding external interference. At the same time, the cross beam 103 connects the T-shaped stands 102 on the same side and extends to the column supporting the L-shaped bracket 101, enhancing the rigidity of the overall structure and preventing displacement of the sensor caused by vibration or external force, ensuring long-term stability of detection. The upper end surface of the horizontal plate of the T-shaped stand 102 is flush with the upper end surface of the L-shaped bracket 101, so that the light curtain body 300 and the double sensor assembly maintain the same height and form a unified detection plane. This layout optimizes the use of space and ensures seamless connection of the detection areas of the infrared light curtain and the laser sensor, avoiding missed detection or false detection.

[0027] The controller 500 is also installed on the stereoscopic frame 100 and is electrically connected to the reflective laser sensors 01 to determine the movement direction of the object. The controller 500 is electrically connected to the light curtain body 300 to control the output signal for sequential detection. The A-side and B-side double sensor assemblies are arranged at intervals, so that the controller can determine the movement direction of the object (e.g., A-side→B-side or B-side→A-side) by triggering the sequence. By detecting the time difference between the triggering of the two sensors when the object passes through, the controller 500 can determine whether the object is moving from the A-side to the B-side or in the opposite direction. This combined design allows the safety light curtain not only to detect object intrusion but also to identify the movement direction, thereby realizing the release function in a specific direction (e.g., only allowing A-side→B-side), avoiding the false stop problem caused by the traditional light curtain triggering in both directions, and significantly improving the efficiency of industrial production. The spatial layout (linear arrangement along the X axis) and cooperative working mode of the three components are key innovative points of the utility model for realizing sequential detection.

[0028] The control process of the controller is realized by the time sequence triggering of the A / B side double sensor assembly and the cooperative detection of the light curtain body to realize intelligent direction recognition: when the object moves, the controller 500 first judges the moving direction (A side to B side) according to the triggering sequence of the two side reflective laser sensors 01 (such as A side Sensor1 to Sensor2). When the object moves, the two sensors will be triggered in turn, generating two electrical signals with a time difference. The controller 500 records the triggering time stamp of the two signals in real time to form time sequence data, and verifies it in combination with the shielding signal of the light curtain body 300. If the direction conforms to the preset allowed direction (such as only A side to B side is allowed), the alarm output is suppressed, otherwise the safety signal is triggered immediately. This double detection mechanism of "time sequence judgment + light curtain verification" cooperates with the sensor spacing accuracy ensured by the T-shaped stand 102, which not only solves the defect that the traditional light curtain cannot distinguish the direction, but also realizes the intelligent control of directional passing in the production process through the programmable logic of the controller 500, which ensures the safety and improves the production efficiency by more than 40%. Specifically, the controller 500 includes a signal acquisition module that receives the triggering signals of the reflective laser sensor 01 and the shielding signals of the light curtain body 300 in real time, a signal processing module that judges the moving direction of the object according to the time difference of the A / B side sensor triggering, and a logic control module that controls the output signal of the light curtain body according to the direction judgment result, and a signal and output module that interacts with external devices (such as PLC, emergency stop system) to output safety signals or alarm information. According to the complexity of the application scene, the following embedded microcontroller (MCU), programmable logic controller (PLC) or industrial computer can be selected as the hardware platform.

[0029] The above embodiments are not a limitation of the present application, and the present application is not limited to the above examples. Changes, modifications, additions or replacements made by those skilled in the art within the technical solution of the present application also belong to the protection scope of the present application.

Claims

1. A safety light curtain that enables sequential detection, characterized by, The application relates to a light curtain device, which comprises a stereoscopic frame, an A-side double-sensor assembly, a light curtain main body and a B-side double-sensor assembly which are sequentially arranged along the X-axis direction of the stereoscopic frame. The light curtain main body comprises an infrared emission module and an infrared receiving module which are oppositely arranged along the Z-axis on the stereoscopic frame; the A-side double-sensor assembly and the B-side double-sensor assembly each comprise two reflective laser sensors which are arranged at intervals along the X-axis and are located in the interval space on the two sides of the infrared emission module and the infrared receiving module. The application further comprises a controller which is arranged on the stereoscopic frame and is electrically connected with the reflective laser sensors to judge the moving direction of an object according to the reflective laser sensors, and the controller is electrically connected with the light curtain main body to realize sequential detection of the output signals.

2. The safety light screen with achievable sequential detection of claim 1, wherein: The light curtain main body is arranged on the L-shaped support which is horizontally arranged on the middle top end of the stereoscopic frame along the Y-axis, and the infrared emission module and the infrared receiving module are fixedly connected with the straight side of the L-shaped support.

3. The safety light screen with achievable sequential detection of claim 2, wherein: The A-side double-sensor assembly and the B-side double-sensor assembly are arranged on the T-shaped stands which are arranged at intervals on the same side of the stereoscopic frame.

4. The safety light screen with achievable sequential detection of claim 3, wherein: The reflective laser sensors are arranged in the through holes of the horizontal plates of the T-shaped stands.

5. The safety light screen with achievable sequential detection of claim 4, wherein: The upper end surfaces of the horizontal plates of the T-shaped stands are flush with the upper end surface of the L-shaped support.

6. The safety light screen with achievable sequential detection of claim 1, wherein: The cross beams are arranged between the T-shaped stands which are arranged at intervals on the same side, and the cross beams are extended to connect the vertical columns of the L-shaped support on the stereoscopic frame.

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