Magnetic type safety door lock and electromagnetic lock sucker detection method thereof

Abstract

The invention discloses a magnetic type safety door lock and an electromagnetic lock suction cup detection method thereof.The magnetic type safety door lock is composed of an inductor of a lock body and an actuator at the key end, and after the inductor receives a locking instruction of a controller, an electromagnet is controlled to be powered on to generate a strong magnetic field to suck a metal suction cup of the actuator; a method for detecting an electromagnetic lock sucker of a magnetic safety door lock comprises the steps that when an inductor controls an electromagnet to be powered on, whether a metal sucker approaches or not is detected by detecting current changes at the moment when the electromagnet is powered on, and if the sucker is detected, continuous power-on is kept, and a locking signal is output to a controller; and if the suction cup is not detected to be close, a small current is adopted for periodical electrification, but a locking signal is not output. The door lock function can be normally used only when it is ensured that the in-place assembling gap is small enough, and dangerous failures are avoided.

Description

Technical Field

[0001] The present invention relates to the field of magnetic safety door locks, and in particular to a magnetic safety door lock and a method for detecting an electromagnetic lock suction cup thereof. Background Art

[0002] In industrial protective door applications, there's a safety door lock that uses RFID to sense the door's opening and closing. When the door is closed, the controller sends a command to the lock to close. The lock then drives an electromagnet, generating a magnetic field that attracts a suction cup actuator mounted on the movable door, locking the door with a suction force of several hundred Newtons. If the lock and actuator are not properly assembled or a gap forms between them, the electromagnet's suction force decreases as the gap widens, allowing the door to open easily and potentially creating a dangerous situation. Summary of the Invention

[0003] The object of the present invention is to provide a magnetic safety door lock and an electromagnetic lock suction cup detection method thereof to solve the above technical problems.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical solutions: A magnetic safety door lock, consisting of a sensor on the lock body and an actuator on the key end. After the sensor receives the lock command from the controller, it controls the electromagnet to generate a strong magnetic field to attract the metal suction cup of the actuator. The sensor uses transistor Q1 to switch and drive the electromagnet L1 to supply power. The voltage regulator D1 and diode D2 provide a discharge path for the coil, which speeds up the discharge speed after power failure. The resistor R1 is used as the coil current sampling resistor, and its resistance value is negligible relative to the coil. The sensor electromagnet coil current sampling and amplification module amplifies the tiny mV voltage on the sampling resistor R1 to the V level through the amplifier and sends it to the next stage for sampling; The sensor electromagnet coil current detection module is used to detect the current change amplitude and duration width; The sensor logic processing module MCU, as the central processor of the entire sensor, is responsible for controlling the driving electromagnet and detecting the electromagnet current; The key end actuator suction cup is made of metal with strong magnetic conductivity.

[0005] The electromagnetic lock suction cup detection method of the magnetic safety door lock is that when the sensor controls the electromagnet to be energized, it first detects whether there is a metal suction cup approaching by detecting the instantaneous current change when the electromagnet is energized. If the suction cup is detected, the power is kept on and a locking signal is output to the controller; if the suction cup is not detected approaching, a small current (small suction force) is used to periodically energize, but no locking signal is output.

[0006] Compared with existing technologies, the present invention has the following advantages: The problem addressed by the present invention is the danger of insufficient magnetic suction force preventing the door from locking due to a large gap between the door lock and the actuator caused by assembly or other external factors. The present invention ensures that the gap is sufficiently small when assembled to ensure normal door lock function and avoid dangerous failure. The present invention can achieve a higher level of security for electromagnetic magnetic locks, making it suitable for industrial safety applications, protecting personnel or machinery, and reducing the risk of dangerous failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a principle block diagram of the magnetic safety door lock of the present invention; Figure 2 This is the current waveform diagram sampled by the present invention (where a is the current waveform diagram when the inductance value of the electromagnet coil remains unchanged, and b is the current waveform diagram when the inductance value of the electromagnet coil increases). DETAILED DESCRIPTION

[0008] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0009] like Figure 1 As shown in the figure, a magnetic safety door lock consists of a sensor on the lock body and an actuator on the key end. After the sensor receives the lock command from the controller, it controls the electromagnet to generate a strong magnetic field to attract the metal suction cup of the actuator. The sensor uses transistor Q1 to switch and drive the electromagnet L1 to supply power. The voltage regulator D1 and diode D2 provide a discharge path for the coil, which speeds up the discharge speed after power failure. The resistor R1 is used as the coil current sampling resistor, and its resistance value is negligible relative to the coil. The sensor electromagnet coil current sampling and amplification module amplifies the tiny mV voltage on the sampling resistor R1 to the V level through the amplifier and sends it to the next stage for sampling; The sensor electromagnet coil current detection module is used to detect the current change amplitude and duration width; the sensor logic processing module MCU, as the central processor of the entire sensor, is responsible for controlling the driving electromagnet and detecting the electromagnet current; the key end actuator suction cup is made of metal with strong magnetic conductivity.

[0010] The main core component of the lock body sensor adopts a circular flat electromagnet, and the internal coil of the electromagnet is waterproofed by a glue-filling process; the sensor uses a transistor Q1 switch to drive the electromagnet power supply, and the electromagnet coil is connected in parallel with a discharge path device, and a Zener voltage regulator D1 is used in series with a Schottky diode D2 to increase the coil discharge voltage, which can accelerate the discharge speed after the coil is powered off, and keep the current change of each driving electromagnet consistent; a small resistor R1 is connected in series with the sensor electromagnet coil loop to sample the electromagnet current. The resistance value is selected to be negligible compared to the coil resistance, so as not to affect the current and suction of the electromagnet; after R1 sampling, it is converted into a voltage signal and then amplified by the amplifier to the voltage range that the MCU can detect, and then sampled by AD to detect the current of the electromagnet; the metal suction cup, the core component of the key actuator, must be made of a strong magnetic conductive metal material with high density and high flatness surface treatment to achieve a strong magnetic suction force.

[0011] The electromagnetic lock suction cup detection method of the magnetic safety door lock is as follows: after the sensor receives the lock command from the controller, it drives the electromagnet to energize; when the actuator suction cup is not close to the sensor electromagnet, the inductance value of the electromagnet coil remains unchanged. At the moment the electromagnet is energized, the sampled current waveform is as follows: Figure 2 As shown in a, the amplitude is small and the duration is short. When the actuator suction cup is close to the sensor electromagnet, the inductance of the electromagnet coil will increase. At the moment the electromagnet is energized, the sampled current waveform is as follows: Figure 2 As shown in b, the amplitude is large and the duration is long. By setting the thresholds of the sampling amplitude and duration, the size of the gap between the electromagnet and the suction cup can be matched, thereby detecting the presence or absence of the suction cup.

[0012] This new design allows for detection of the magnetic lock suction cup, achieving a higher level of safety and reducing the risk of dangerous failures.

[0013] The above is a preferred embodiment of the present invention. For ordinary technicians in this field, based on the teachings of the present invention, without departing from the principles and spirit of the present invention, changes, modifications, substitutions and variations made to the implementation methods are still within the scope of protection of the present invention.

Claims

1. A magnetic safety door lock, characterized in that: It consists of a sensor on the lock body and an actuator on the key end. After the sensor receives the lock command from the controller, it controls the electromagnet to generate a strong magnetic field to attract the metal suction cup of the actuator. The sensor uses transistor Q1 to switch and drive the electromagnet L1 to supply power. The voltage regulator D1 and diode D2 provide a discharge path for the coil, which speeds up the discharge speed after power failure. The resistor R1 is used as the coil current sampling resistor, and its resistance value is negligible relative to the coil. The sensor electromagnet coil current sampling and amplification module amplifies the tiny mV voltage on the sampling resistor R1 to the V level through the amplifier and sends it to the next stage for sampling; The sensor electromagnet coil current detection module is used to detect the current change amplitude and duration width; The sensor logic processing module MCU, as the central processor of the entire sensor, is responsible for controlling the driving electromagnet and detecting the electromagnet current; The key end actuator suction cup is made of metal with strong magnetic conductivity.

2. A method for detecting the electromagnetic lock suction cup of a magnetic safety door lock according to claim 1, characterized in that: When the sensor controls the electromagnet to be energized, it first detects whether a metal suction cup approaches by detecting the instantaneous current change when the electromagnet is energized. If a suction cup is detected, the power is continuously supplied and a locking signal is output to the controller. If no suction cup is detected approaching, a small current is used to periodically supply power, but no locking signal is output.

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