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A selective alarm based on magnetorheological fluid

A magneto-rheological fluid and alarm technology, applied to alarms, instruments, etc., can solve the problems of alarm installation mechanism, alarm strength, sensitivity, durability, and production cost constraints, and achieve compact structure, high reliability, The effect of cost convenience

Active Publication Date: 2017-03-08
知普企望(温州)电力技术研究院有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The main reason is that this kind of professional alarm is restricted by various factors such as installation mechanism, alarm intensity and sensitivity, durability and production cost.

Method used

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  • A selective alarm based on magnetorheological fluid

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Embodiment Construction

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

[0009] 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 casing 11 has two chambers, which are isolated by the isolator 7. The two chambers are respectively provided with an opening. The opening of the upper chamber forms a moving pair with the shaft frame 3. The shaft frame 3 and the sealing ring 2 The upper chamber is sealed, the magnetorheological fluid 4 is filled in this sealed chamber, and the electromagnetic coil 5 is wound on the shaft frame 3; The variable liquid 4 is isolated from the lower chamber, and a volume compensator 8 ...

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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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Patent Type & Authority Patents(China)
IPC IPC(8): G08B21/02
Inventor 高春甫张广邓绍泰黄鹏任韶卿季海峰
Owner 知普企望(温州)电力技术研究院有限公司
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