Anti-pinch photoelectric sensor device based on optocoupler isolation

Abstract

An anti-pinch photoelectric sensor device based on optocoupler isolation adopts an encoder technology, so that seven photoelectric sensors can be driven through three IO ports. By means of the design, the utilization efficiency of the IO port of the main control chip is greatly improved, and the problem that in a traditional design, IO port resource consumption is too large is solved. According to the optical coupling isolation technology, an optical coupling isolator is introduced between a photoelectric sensor and a main control chip, and electrical isolation is achieved. The optical coupler isolation effectively shields electromagnetic interference, ensures the stability of signal transmission, improves the electrical safety of the system, and prevents interference and faults from affecting the main control chip. According to the utility model, the circuit design is simplified, the encoder and the optical coupling isolator are introduced, the connection and wiring of the sensor are simplified, and the complexity of the circuit design is reduced. The simplified circuit design reduces the difficulty of manufacturing and debugging, and improves the reliability of the system.

Description

Technical Field

[0001] The utility model belongs to the electronics industry, and in particular relates to a multi-sensor driven finger pinching prevention photoelectric sensor device based on optical coupling isolation. Background Art

[0002] In the upper limb joint rehabilitation training system, safety is a key factor that must be considered during the design and application process. With the increasing popularity of rehabilitation training systems, preventing patients from accidental injuries during training, especially preventing hand pinching accidents, has become an important technical requirement. In order to effectively prevent hand pinching, photoelectric sensor technology is widely used in rehabilitation training systems.

[0003] Photoelectric sensors are sensors that use the principle of photoelectric conversion to detect the presence or motion of an object. The working principle is based on the fact that the light beam emitted by a light source is reflected or interrupted when it encounters an object, which is then detected by a photoelectric receiver and converted into an electrical signal for processing. Photoelectric sensors perform well in finger pinch prevention applications because they have the advantages of non-contact measurement, fast response speed, and high accuracy.

[0004] Application of anti-pinch photoelectric sensor

[0005] In the upper limb joint rehabilitation training system, the anti-pinch photoelectric sensor is usually arranged at the key position of the robot arm or bracket. When the patient's hand or other objects enter the detection range of the photoelectric sensor, the sensor will quickly detect and trigger the system to stop movement or reverse movement, thereby avoiding the occurrence of pinching accidents.

[0006] Advantages of Photoelectric Sensors

[0007] High sensitivity: Photoelectric sensors can quickly detect tiny movements or object changes, providing instant response to ensure the safety of the system.

[0008] Non-contact measurement: Since the photoelectric sensor does not need to contact the object being measured, the possibility of secondary injury to the patient is avoided.

[0009] Easy installation: The photoelectric sensor is small in size and light in weight, and can be easily installed in different locations of the rehabilitation training system and adapt to various complex mechanical structures.

[0010] Strong reliability: Modern photoelectric sensor technology is mature, has high stability and anti-interference ability, and can work reliably under various environmental conditions.

[0011] In recent years, with the continuous advancement of photoelectric sensor technology, new photoelectric sensors have not only improved in accuracy and sensitivity, but also have stronger environmental adaptability and intelligent functions. For example, intelligent photoelectric sensors that integrate data processing and communication modules can achieve more complex safety detection and feedback control, providing a stronger guarantee for the safety of upper limb joint rehabilitation training systems.

[0012] With the continuous advancement of technology, the demand for convenience and stability of intelligent medical devices has become increasingly important. The reset function has become more intelligent and reliable, and the risk of active device reset caused by misoperation has been reduced.

[0013] Technical solutions of the prior art

[0014] The existing design scheme of anti-pinch photoelectric sensor mainly includes the following aspects:

[0015] 1. Independent IO port configuration: Each photoelectric sensor needs to be connected to an IO port of the main control chip. The main control chip receives the sensor's signal through these IO ports to detect the presence or movement of objects;

[0016] 2. Direct electrical connection: The photoelectric sensor is directly electrically connected to the main control chip without any isolation measures. This design enables fast signal transmission between the sensor and the main control chip, but it is also susceptible to electromagnetic interference and noise;

[0017] 3. Simple circuit design: The circuit design is usually simple, and each sensor has an independent power supply and signal transmission line. The main control chip determines whether there is a risk of pinching the hand by reading the status of each IO port and takes corresponding actions;

[0018] 4. Basic control system: When the photoelectric sensor detects an object, it immediately sends a signal to the main control chip, which stops or reverses the movement of the robot arm according to the preset logic. The entire control process relies on simple logical judgment and hardware interruption.

[0019] The shortcomings of the existing technology are

[0020] Although the above technical solutions provide basic protection against pinching fingers, they have obvious disadvantages and limitations:

[0021] 1. Large consumption of IO port resources: Each photoelectric sensor requires an independent IO port connection. As the number of sensors increases, the IO port resources of the main control chip are quickly exhausted, limiting the scalability and flexibility of the system;

[0022] 2. Insufficient electrical isolation: Since the photoelectric sensor is directly electrically connected to the main control chip, the system is susceptible to electromagnetic interference and noise, resulting in unstable detection signals. In addition, the lack of electrical isolation also increases the risk of short circuits or other electrical failures in the circuit;

[0023] 3. High complexity of circuit design: Each sensor has independent connection and power supply lines. As the number of sensors increases, the circuit design and wiring become complicated, which not only increases the difficulty of design and manufacturing, but also increases the failure rate;

[0024] 4. High cost: Since each sensor needs to be configured with an independent IO port and related circuits, the hardware cost of the system is relatively high. Especially in application scenarios that require a large number of sensors, the cost issue is more prominent.

[0025] In summary, the existing anti-pinch finger solution has obvious shortcomings in terms of IO port resource consumption, electrical isolation, design complexity and cost. By optimizing the design circuit of the photoelectric sensor, these shortcomings can be effectively overcome and the overall performance and reliability of the system can be improved. Summary of the invention

[0026] The purpose of the utility model is to solve multiple technical problems existing in the design of existing anti-pinch photoelectric sensors, and to provide an improved photoelectric sensor system to achieve more efficient resource utilization, more stable signal transmission and simpler circuit design.

[0027] The technical solution of the utility model is composed of an encoder, an optical coupler isolation, a main control and seven photoelectric sensors.

[0028] The utility model includes seven photoelectric sensors, which are respectively labeled as photoelectric sensor 1 to photoelectric sensor 7. These sensors are distributed in the area to be monitored and are used to detect the existence or movement of objects. Photoelectric sensor 1 to photoelectric sensor 7 are respectively connected to different ports of the encoder.

[0029] The encoder of the utility model is located between the photoelectric sensor and the optical coupler isolation, and is responsible for encoding and sorting the signals from each sensor. After the encoder integrates multiple sensor signals, it transmits them to the optical coupler isolation unit through a small number of IO ports. This design allows the system to use three IO ports to drive seven sensors, greatly saving the IO port resources of the main control chip.

[0030] The optical coupling isolation unit of the utility model is used to electrically isolate the encoder from the main control chip. Through the optical coupling isolation technology, the system can effectively shield electromagnetic interference, ensure the stability of signal transmission, and at the same time improve the electrical safety of the system and prevent the influence of electrical faults on the main control chip.

[0031] The main control chip of the utility model receives the sensor signal processed by optical coupling isolation and controls the movement of the robot arm or bracket according to the preset logic. The main control chip is connected to the encoder through three IO ports, and can efficiently manage and process the signals from seven photoelectric sensors.

[0032] Beneficial effects of the utility model:

[0033] 1. Reduce IO port resource consumption, use three IO ports to drive seven photoelectric sensors, greatly save the IO port resources of the main control chip, and improve the scalability and flexibility of the system;

[0034] 2. Realize electrical isolation and improve system stability and safety. The utility model adopts optical coupling isolation technology to realize electrical isolation between the sensor and the main control chip, effectively shield external interference, improve the stability of signal transmission and the safety of the system, and reduce equipment failure and maintenance risks;

[0035] 3. Simplify circuit design and reduce design and manufacturing complexity;

[0036] 4. Reduce the need for independent IO ports and related circuits, significantly reducing the hardware cost of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is the principle block diagram of the utility model; Figure 2 is the truth table of the utility model; Figure 3 This is a circuit connection diagram of the utility model. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the present invention and make the above-mentioned purposes, features and advantages more obvious and understandable, the present invention is further described in detail below in conjunction with embodiments.

[0039] like Figure 1 , Figure 3 As shown, an anti-pinch photoelectric sensor device based on optical coupling isolation is composed of an encoder, an optical coupling isolation, a main control chip and 7 photoelectric sensors.

[0040] Photoelectric sensors: The system contains seven photoelectric sensors, labeled as Photoelectric sensor 1 to Photoelectric sensor 7. These sensors are distributed in the area to be monitored to detect the presence or movement of objects. Photoelectric sensor 1 to Photoelectric sensor 7 are connected to different ports of the encoder. Each photoelectric sensor monitors the target area in real time, and when an object is detected, the sensor generates an electrical signal. These signals are connected to the input terminals (IN0 to IN6) of the encoder through resistors (R1 to R7).

[0041] Encoder: The encoder is located between the photoelectric sensor and the optocoupler isolator, and is responsible for encoding and sorting the signals from each sensor. The encoder integrates the signals from multiple sensors and transmits them to the optocoupler isolator through a small number of IO ports. This design allows the system to drive seven sensors using three IO ports, greatly saving the IO port resources of the main control chip. The encoder (U1) encodes and integrates the signals from the seven photoelectric sensors and transmits the encoded signals through the three ports A0, A1 and A2. The encoded signals are transmitted to the optocoupler isolators (U4, U5, U6).

[0042] Optocoupler isolation: The optocoupler isolation unit is used to electrically isolate the encoder from the main control chip. Through optocoupler isolation technology, the system can effectively shield electromagnetic interference and ensure the stability of signal transmission. At the same time, it improves the electrical safety of the system and prevents the influence of electrical faults on the main control chip. The optocoupler isolator receives the encoding signal and realizes electrical isolation through photoelectric coupling to ensure the stability of the signal. The isolated signal is transmitted from the output end of the optocoupler isolator to the corresponding IO port of the main control chip (U3).

[0043] Main control chip: The main control chip receives the sensor signals processed by optical coupling isolation and controls the movement of the robot arm or bracket according to the preset logic. The main control chip is connected to the encoder through three IO ports, and can efficiently manage and process the signals from seven photoelectric sensors. When the risk of pinching is detected, the main control chip can respond quickly to stop or reverse the movement of the robot arm to ensure the safety of the system.

Claims

1. A finger pinch prevention photoelectric sensor device based on optical coupling isolation, consisting of an encoder, an optical coupling isolation, a main control chip and a photoelectric sensor, characterized in that: The device comprises seven photoelectric sensors, which are respectively labeled as photoelectric sensor 1 to photoelectric sensor 7, and photoelectric sensor 1 to photoelectric sensor 7 are respectively connected to different ports of the encoder; the encoder is located between the photoelectric sensor and the optical coupler isolation, and the encoder integrates multiple sensor signals and transmits them to the optical coupler isolation unit through a small number of IO ports; The optocoupler isolation unit is used to perform electrical isolation between the encoder and the main control chip; the main control chip receives the sensor signal processed by optocoupler isolation, and presets the logic to control the movement of the robotic arm or bracket. The main control chip is connected to the encoder through three IO ports to process signals from seven photoelectric sensors.

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