Selective alarm based on magnetorheological fluid

A magnetorheological fluid and selective technology, applied in the direction of alarms, instruments, etc., can solve the problems of alarm installation mechanism, alarm strength, sensitivity and durability, and production cost constraints, and achieve compact structure, high reliability, and high reliability. Responsive effect

Active Publication Date: 2014-11-05
ZHEJIANG NORMAL UNIVERSITY
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Problems solved by technology

The main reason is that this kind of professional alarm is restricted by various factors suc

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  • Selective alarm based on magnetorheological fluid

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Embodiment Construction

[0007] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0008] In the figure, a selective alarm device based on magnetorheological fluid of the present invention, its internal structure is composed of a flat plate 1, a sealing ring 2, a shaft frame 3, a magnetorheological fluid 4, an electromagnetic coil 5, an isolator 7, Volume compensator 8, delay conversion contact 9, return spring 10, and housing 11 are composed. The magneto-rheological fluid 4 is filled between the housing 11 , the shaft frame 3 and the isolator 7 , and is sealed by the sealing ring 2 , the electromagnetic coil 5 is wound on the shaft frame 3 , and the volume compensator 8 is arranged inside the isolator 7 .

[0009] The electromagnetic coil 5 is in the energized state, and a magnetic circuit 12 is generated in the housing 11, the shaft frame 3 and the gap 6 between them, thereby generating a magnetic field around the magnetor...

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Abstract

The invention relates to a selective alarm based on magnetorheological fluid, which is used for keeping order in a playground for children and ensuring safety of the children. The device is composed of a flat plate, a sealing circle, a shaft frame, the magnetorheological fluid, electromagnetic coins, an isolator, volume compensators, delay switching contacts, reset springs and a shell. When the electromagnetic coins are energized, magnetic circuits are generated in the shell, the shaft frame and the gap, and thus the magnetorheological fluid is converted to a high-viscosity and low-liquidity Bingham fluid from the original Newton fluid. The shaft frame is fixed inside the shell. When enough pressure (larger than the shearing force of the magnetorheological fluid) is applied to the flat plate, the shaft frame begins to move downwardly until to be contacted with the delay switching contact, and an alarm is given. Through adjusting the magnitude of current passing through the electromagnetic coins, the shearing force of the magnetorheological fluid can enable a child to pass through without giving an alarm and an alarm is given when an adult passes. The device selectively gives an alarm through changing the magnitude of the current, and intelligence of the alarm can be realized.

Description

technical field [0001] The invention relates to an alarm device, in particular to a selective alarm device based on magnetorheological fluid. Background technique [0002] With the continuous improvement of people's living standards, various scenic spots in the amusement park are full of children every holiday, which makes it possible for those criminals to take advantage of it, and incidents of missing children often occur. Existing alarm has multiple, such as car (police car, ambulance) alarm, safe alarm, anti-theft door alarm. However, there are no special alarms for children installed at specific attractions in playgrounds. The main reason is that this professional alarm is restricted by various factors such as installation mechanism, alarm intensity and sensitivity, durability and production cost. In order to ensure the safety of places where children gather, such as playgrounds, it is imperative to produce alarms that are easy to install, reliable and cheap. Conten...

Claims

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Application Information

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IPC IPC(8): G08B21/02
Inventor 高春甫张广邓绍泰黄鹏任韶卿季海峰
Owner ZHEJIANG NORMAL UNIVERSITY
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