Grating device of active mobile bracelet

Abstract

The invention relates to the technical field of industrial safety protection, and discloses a grating device of an active mobile bracelet, comprising: a transmitting terminal which is a mobile bracelet structure that can be worn by an operator on a hand and is used for actively transmitting modulated signal light; the receiving end is of a structure fixedly installed in an equipment protection area, and a receiving element used for receiving the signal light is arranged on the receiving end; and the receiving end is configured to judge that the light path is switched on only when receiving the signal light which is transmitted by the transmitting end and accords with a preset modulation rule, and outputs the signal light for control according to the signal light. The transmitting end is designed to be a movable bracelet which can be worn by an operator, and the receiving end is fixedly mounted, so that the hands of the operator are directly and accurately protected, and compared with a traditional area protection grating, the area protection grating has higher safety level and protection accuracy.

Description

Technical Field

[0001] This invention relates to the field of industrial safety protection technology, specifically to an optical grating device for an active mobile wristband. Background Technology

[0002] In industrial production, especially in hazardous work environments involving human-machine interaction, such as rubber mixing machines, ensuring the safety of operators is paramount. Therefore, safety light curtains or photoelectric sensors are typically installed in hazardous areas of the machinery to trigger an emergency stop when personnel are detected entering.

[0003] Currently, fixed-installation diffuse reflection photoelectric sensors are commonly used in such applications. Their working principle involves the sensor emitting a beam of light and detecting the light diffusely reflected from the surface of a target object (such as an operator's hand or body) to determine its presence. However, this passive reflection-based technology has inherent drawbacks. Its detection performance is heavily dependent on the material, color, and angle of the target object's surface, as well as the intensity of ambient light; any change can lead to signal instability. This instability not only causes frequent unplanned equipment downtime due to false triggers, severely impacting production efficiency, but more importantly, it may miss detections in complex lighting environments or with low reflectivity targets, leaving significant uncertainty and safety hazards for personnel protection and failing to meet increasingly stringent national safety standards. Therefore, the industry urgently needs a new safety protection technology with more stable detection, stronger anti-interference capabilities, and more proactive and reliable protection. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an active mobile wristband grating device, which solves the problems of low reliability and reduced production efficiency caused by unstable detection and susceptibility to ambient light interference in traditional diffuse reflection security sensors.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a grating device for an active mobile wristband, comprising:

[0006] A transmitter, which is a mobile wristband structure that can be worn on the hand by an operator, for actively emitting modulated signal light;

[0007] A receiving end, wherein the receiving end is a structure fixedly installed in the protective area of ​​the equipment, and is provided with a receiving element for receiving the signal light;

[0008] Two mounting brackets are used to fix the receiver in the protected area of ​​the equipment.

[0009] The receiver is configured to determine that the optical path is connected only when it receives a signal light emitted by the transmitter that conforms to a preset modulation rule, and outputs a control accordingly.

[0010] Preferably, the transmitting end is arrayed with multiple infrared emitting lamp beads for emitting the signal light along a circumferential range greater than a certain degree.

[0011] Preferably, the wristband body of the transmitting end has a built-in rechargeable battery that powers the infrared emitting LED and internal circuitry.

[0012] Preferably, the signal light is infrared light modulated by a specific frequency or a specific code; the receiver has a built-in demodulation circuit for identifying the specific frequency or specific code.

[0013] Preferably, the receiving end has multiple receiving elements arranged in a matrix to form a two-dimensional monitoring area.

[0014] Preferably, the control signal includes a first level state and a second level state; when the receiving end receives signal light, it outputs the first level state, and when it does not receive signal light, it outputs the second level state that is opposite to the first level state or forms an open circuit state.

[0015] Preferably, the first level state is an NPN low-level signal, and the second level state is a PNP high-level signal.

[0016] A transmitting wristband for a security protection system, serving as the transmitting end of the device of the claim, comprises:

[0017] A circular bracelet body, suitable for wearing on a person's wrist;

[0018] Multiple infrared emitting LEDs are arranged circumferentially along the main body of the bracelet;

[0019] A control circuit located inside the main body of the bracelet is used to drive the infrared emitting LED to emit infrared light signals that have been modulated in a specific way.

[0020] An internal power supply for powering the control circuit and the infrared emitting LEDs.

[0021] A grating receiver for a security protection system, as the receiving end of the device described in the claim, is configured as follows:

[0022] It receives modulated infrared light signals emitted from a portable transmitter worn on the operator's hand;

[0023] The received signal is demodulated to determine whether it conforms to the preset modulation rule;

[0024] Furthermore, a control signal indicating a safe or closed-loop state is only output to external devices when the signal conforms to this rule.

[0025] A method for achieving security protection using the device described in the claims includes the following steps:

[0026] Install the receiver securely in the hazardous area of ​​the machine that needs protection;

[0027] The transmitter is worn on the hand by the operator;

[0028] When the operator's hand enters the danger zone, the modulated signal light emitted by the transmitter is received and identified by the receiver, and the receiver outputs a first control signal to stop the machine or put it into a safe state.

[0029] When the operator's hand leaves the danger zone, the receiver cannot receive the signal light, thereby outputting a second control signal that allows the machine to operate or deactivates the safety status.

[0030] This invention provides a grating device for an active mobile wristband. It has the following advantages:

[0031] 1. This invention achieves direct and precise protection for the operator's hands by designing the transmitter as a mobile wristband that can be worn by the operator and fixing the receiver in place. This technical solution shifts the focus of safety monitoring from a fixed area to a moving person; as long as the operator's hands are within the danger zone, a safe optical path can be established. This human-centered protection logic offers a higher level of safety and greater protection accuracy compared to traditional area protection light grids.

[0032] 2. This invention uses infrared light modulated by a specific frequency or encoding as a signal, and the receiver is configured to recognize only this specific modulated signal. This technical feature enables the system to effectively distinguish between valid signals from the transmitting wristband and invalid signals from other interference sources such as ambient light and equipment thermal radiation. It fundamentally solves the problem of unstable detection and frequent false alarms caused by external interference in existing technologies such as diffuse reflection gratings, and significantly improves the reliability of the device in complex industrial environments.

[0033] 3. This invention, by setting a wide-angle emitting LED array (greater than 180 degrees) on the transmitting wristband and cooperating with a receiving tube matrix at the receiving end, ensures a stable optical path connection regardless of the operator's wrist position. This design eliminates the need for strict optical axis alignment required by traditional through-beam gratings and the tedious adjustment of reflection angles, greatly simplifying the installation, debugging, and maintenance of the device, and improving the system's versatility and ease of use. Attached Figure Description

[0034] Figure 1 This is a perspective view of the present invention;

[0035] Figure 2 This is a schematic diagram of the receiving end of the present invention;

[0036] Figure 3 This is a schematic diagram of the main structure of the wristband of the present invention.

[0037] The components include: 1. Receiver; 2. Transmitter; 3. Infrared emitting LED; 4. Wristband body; 5. Receiving element; and 6. Mounting bracket. Detailed Implementation

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Please see the appendix Figure 1 - Appendix Figure 3 This invention provides an optical grating device for an active mobile wristband, comprising:

[0040] A transmitter 2, which is a portable wristband structure worn by an operator, is used to actively emit modulated signal light; a receiver 1, which is a structure fixedly installed in the equipment protection area, is equipped with a receiving element 5 for receiving signal light, and two mounting brackets 6 for fixing the receiver 1 in the equipment protection area; the receiver 1 is configured to determine that the optical path is connected only when it receives signal light emitted by the transmitter 2 that conforms to a preset modulation law, and outputs control accordingly; the transmitter 2 has multiple infrared emitting lamps 3 arrayed along a circumferential range greater than 180 degrees for emitting signal light. Inside the main body 4 of the bracelet 2, there is a built-in rechargeable battery that powers the infrared emitting LED 3 and the internal circuit. The signal light is infrared light modulated by a specific frequency or a specific code. The receiver 1 has a built-in demodulation circuit for identifying a specific frequency or a specific code. Multiple receiving elements 5 are arranged in a matrix on the receiver 1 to form a two-dimensional monitoring area. The control signals include a first level state and a second level state. When the receiver 1 receives the signal light, it outputs the first level state. When it does not receive the signal light, it outputs the second level state opposite to the first level state or forms an open circuit state. The first level state is an NPN low level signal, and the second level state is a PNP high level signal.

[0041] Specifically, firstly, the operator wears the wristband 4, which serves as the mobile transmitter 2, on their wrist. The wristband's built-in control circuit continuously drives the infrared emitting LEDs 3 arranged in a large-angle ring, actively and uninterruptedly emitting infrared light signals modulated by specific codes or frequencies. This modulated signal acts like a unique identification code, effectively distinguishing it from ordinary infrared light interference in the environment. When the operator's hand enters a dangerous area closely monitored by the fixed receiver 1, the array of receiving elements 5 on it captures the specific modulated signal from the wristband. The internal signal processing unit of the receiver 1 immediately demodulates and decodes the signal at high speed to verify whether it is a preset, valid safety signal. Once the signal is confirmed to be valid, the system determines that the optical path forms a safe closed loop, clearly indicating that the operator's hand is in potential danger. At this point, receiver 1 immediately outputs a clear first control signal (e.g., NPN low level) to the connected equipment control system to force the equipment into or remain in a safe stop state, thereby achieving immediate protection for personnel. Conversely, when the hand wearing the wristband leaves the danger zone, receiver 1 will not receive a valid modulation signal, thus determining that the safety optical path is interrupted, forming an open circuit state. This indicates that the direct human-caused danger has been eliminated. Subsequently, receiver 1 seamlessly switches its output signal to a second control signal, the opposite of the previous one, notifying the equipment control system to release the safety lock and allow the equipment to start or resume normal operation, achieving real-time, dynamic, and follow-up protection for the operator's hand. It not only fundamentally solves the safety hazards caused by environmental interference and detection uncertainty in traditional solutions, but also, with its precise and reliable response mechanism, constructs an active and intelligent safety defense line for human-machine collaboration in complex industrial environments.

[0042] A transmitting wristband for a security protection system, serving as a transmitting end 2, includes:

[0043] A circular bracelet body 4, suitable for wearing on a person's wrist;

[0044] Multiple infrared emitting LED beads are arranged 3 times around the main body of the bracelet;

[0045] A control circuit located inside the main body 4 of the wristband is used to drive the infrared emitting lamp 3 to emit infrared light signals that have been modulated in a specific way.

[0046] An internal power supply for powering the control circuit and the infrared emitting LED 3, and a grating receiver for the security system, as receiver 1, are configured as follows:

[0047] Receive modulated infrared light signals emitted from a movable transmitter 2 worn on the operator's hand;

[0048] The received signal is demodulated to determine whether it conforms to the preset modulation rule;

[0049] Furthermore, a control signal indicating a safe or closed-loop state is only output to external devices when the signal conforms to this rule.

[0050] A method for achieving security protection includes the following steps:

[0051] Install receiver 1 securely in the hazardous area of ​​the machine that needs protection;

[0052] The operator wears the transmitter 2 on their hand; when the operator's hand enters the danger zone, the modulated signal light emitted by the transmitter 2 is received and identified by the receiver 1, and the receiver 1 outputs a first control signal to stop the machine or put it into a safe state; when the operator's hand leaves the danger zone, the receiver 1 can no longer receive the signal light, and thus outputs a second control signal to allow the machine to run or to deactivate the safe state.

[0053] Working Principle: When using this device, the operator first wears a wristband with transmitter 2 on their wrist. Its internal circuitry drives infrared LEDs 3, arranged in a large-angle ring, to continuously emit a modulated infrared light signal. When the operator's hand enters the danger zone monitored by the fixed receiver 1, the array of receiving elements 5 on receiver 1 captures the modulated signal. The internal circuitry of receiver 1 demodulates and identifies the signal. Once confirmed as a valid signal, it determines that the optical path has formed a closed-loop safety state and outputs a first control signal (e.g., NPN low level) to stop or maintain the machine in a safe state. Conversely, when the hand wearing the wristband 4 leaves the area, receiver 1 cannot receive the signal light and determines it to be in an open-circuit state. It then immediately outputs a second control signal (e.g., PNP high level) that is the opposite of the previous signal, allowing the machine to run or deactivating the safety state. This achieves real-time, accurate, and highly reliable safety protection for the operator's hand.

Claims

1. A grating device for an active mobile wristband, characterized in that, include: A transmitter (2), wherein the transmitter (2) is a mobile wristband structure that can be worn on the hand by an operator, for actively emitting modulated signal light; A receiving end (1), wherein the receiving end (1) is a structure fixedly installed in the equipment protection area, and a receiving element (5) for receiving the signal light is provided thereon; Two mounting brackets (6) are used to fix the receiver (1) in the equipment protection area; The receiver (1) is configured to determine that the optical path is connected only when it receives a signal light emitted by the transmitter (2) that conforms to a preset modulation law, and outputs a control accordingly.

2. The grating device for an active mobile wristband according to claim 1, characterized in that, On the transmitting end (2), a plurality of infrared emitting lamp beads (3) for emitting the signal light are arranged in an array along a range of more than 180 degrees in its circumference.

3. The grating device for an active mobile wristband according to claim 2, characterized in that, The wristband body (4) of the transmitter (2) contains a rechargeable battery that powers the infrared emitting lamp (3) and the internal circuit.

4. The grating device for an active mobile wristband according to claim 1, characterized in that, The signal light is infrared light modulated by a specific frequency or a specific code; the receiver (1) has a built-in demodulation circuit for identifying the specific frequency or specific code.

5. The grating device for an active mobile wristband according to claim 1, characterized in that, The receiving end (1) has multiple receiving elements (5) arranged in a matrix to form a two-dimensional monitoring area.

6. The grating device for an active mobile wristband according to claim 1, characterized in that, The control signal includes a first level state and a second level state; when the receiving end (1) receives signal light, it outputs the first level state, and when it does not receive signal light, it outputs the second level state opposite to the first level state or forms an open circuit state.

7. The grating device for an active mobile wristband according to claim 6, characterized in that, The first level state is an NPN low level signal, and the second level state is a PNP high level signal.

8. A transmitting wristband for a security protection system, serving as the transmitting end (2) of the device according to claim 1, characterized in that, include: A circular bracelet body (4) is suitable for wearing on a person's wrist; Multiple infrared emitting LED beads (3) arranged circumferentially along the main body (4) of the bracelet; A control circuit located inside the main body (4) of the wristband is used to drive the infrared emitting lamp (3) to emit infrared light signals that have been modulated in a specific way. An internal power supply that powers the control circuit and the infrared emitting lamp (3).

9. A grating receiver for a security protection system, as the receiving end (1) of the device according to claim 1, characterized in that, Configured as: Receive modulated infrared light signals emitted from a movable transmitter (2) worn on the operator's hand; The received signal is demodulated to determine whether it conforms to the preset modulation rule; Furthermore, a control signal indicating a safe or closed-loop state is only output to external devices when the signal conforms to this rule.

10. A method for achieving safety protection using the device described in claim 1, characterized in that, Includes the following steps: The receiver (1) is fixedly installed in the hazardous area of ​​the machine that needs protection; The operator wears the transmitter (2) on their hand; When the operator's hand enters the danger zone, the modulated signal light emitted by the transmitter (2) is received and identified by the receiver (1), and the receiver (1) outputs a first control signal to stop the machine from running or to enter a safe state. When the operator's hand leaves the danger zone, the receiver (1) cannot receive the signal light, thereby outputting a second control signal that allows the machine to run or deactivates the safety status.

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