CN211205350U - Sensor overload protection device - Google Patents

Abstract

The utility model discloses a sensor overload protector aims at solving under heavy load and impact environment, avoids the load direct application to the sensor on. The utility model discloses a following technical scheme realizes: the arm end of the rotating rocker arm is provided with a transmission bolt parallel to the trigger sensor and an energy absorption spring sleeved on the transmission bolt, the touch head faces to the sensing surface of the trigger sensor, a return spring fixedly connected to the arm body of the rotating rocker arm and a limiting device located below the return spring and facing to the arm body of the rotating rocker arm are arranged below the touch head, under the action of load, the rotating rocker arm rotates clockwise along a rotating shaft on the arm body, the return spring is compressed, the tail end of the rotating rocker arm is driven to rotate towards the limiting device, the compressed energy absorption spring pushes the transmission bolt to move axially along a guide hole on the rotating rocker arm, and the trigger sensor is switched on by signals; when the external load disappears, the energy absorption spring drives the transmission bolt to reset, and the touch head contact is separated from the sensor, so that the sensor is switched on and off.

Description

Sensor overload protection device

Technical Field

The present invention relates to a trigger sensor technology (hereinafter referred to as "trigger sensor") that uses an electrical contact switch for positioning, monitoring, and detecting and transmits signals in a wired or wireless (e.g., inductive, optical, etc.) manner. In particular for protecting aircraft trigger sensors against overload and impact signals.

Background

The life is reduced regardless of the length of time the instrument is used. Sensors are no exception. The sensor is an important component, and therefore, it becomes a difficult and expensive task to maintain. The sensor is a detection device which can sense the measured information and convert the sensed information into an electric signal or other information in a required form according to a certain rule to output so as to meet the requirements of information transmission, processing, storage, display, recording, control and the like. The overload sensor is subject to a large impact acceleration during use, and has a severe requirement on the impact resistance of the device in order to ensure the reliable operation of the device. In order to improve the shock resistance of the device, encapsulation measures are generally taken for the circuit, and in addition, in order to ensure the shock resistance of the system, the structure and protection design of the system are required. The harsh environments encountered are primarily high and low temperature environments and high impact, high overload environments, under the influence of which failures in the system due to welding failure are progressively exposed. The sensor has a plurality of forms, the overload protection design method of each structural form is different, the methods have respective advantages and disadvantages, the overload protection is designed by methods such as a boss, and the like, and the forming method comprises a back etching technology, a silicon direct bonding technology, a glass etching technology and the like. However, these structures generally have a great limitation that the size of the cavity is large, the sensitivity is further improved, the utilization rate of the silicon wafer is reduced, the complexity of the manufacturing process is increased, and the production cost is increased.

In modern aircraft condition monitoring, a large number of trigger type sensors are used for condition monitoring of moving parts, and the traditional trigger method is that the moving parts act on the sensors directly or through a transmission mechanism without overload protection to give position signals. The traditional triggering mode is applied in a small-load or impact-free environment, and the signal triggering is direct and reliable; however, in order to prevent the displacement of the trigger point, the sensor is damaged by exceeding the designed trigger stroke of the sensor, the requirement on the adjustment precision is high, and in the heavy load and impact environment, even if the stroke is perfectly adjusted, the sensor is often damaged by the over-stroke due to the structural deformation caused by the heavy load and the impact.

SUMMERY OF THE UTILITY MODEL

In order to solve under heavy load and impact environment, avoid the load directly to use the sensor on, eliminate the heavy load simultaneously and strike the reliability that the structural deformation influence signal that leads to triggers, the protection triggers formula sensor and does not receive the damage, the utility model aims at providing a mainly used protection aircraft is with triggering formula sensor not impaired, avoids the malfunction of the sensor that probably appears, prevents that the sensor from bearing overload and impact and the damage prevent overload, the trigger signal protection device who strikes.

The utility model provides a technical scheme that its technical problem adopted is: a sensor overload protection device, which is provided with a rotary rocker arm 3 provided with a touch head 9 on an arm body, is characterized in that: a transmission bolt 1 parallel to the trigger sensor 8 and an energy-absorbing spring 2 sleeved on the bolt shaft are arranged at the arm end of the rotating rocker arm 3, the touch head 9 faces the sensing surface of the trigger sensor 8, a return spring 7 fixedly connected to the arm body of the rotating rocker arm 3 and a limiting device 6 positioned below the return spring 7 and facing the arm body of the rotating rocker arm 3 are arranged below the touch head 9, the transmission bolt 1 capable of axially moving is arranged, the rotating rocker arm 3 rotates clockwise along a rotating shaft 5 on the arm body under the action of load of the energy-absorbing spring 2 assembled between the rotating rocker arm 3 and the transmission bolt 1, the return spring 7 is compressed, the tail end of the rotating rocker arm 3 is driven to rotate towards the limiting device 6, and when the external load exceeds the elastic force of the energy-absorbing spring 2, the compressed energy-absorbing spring 2 pushes the transmission bolt 1 to axially move along a guide hole 10 on the rotating rocker arm 3, the trigger sensor 8 is in signal connection, if the external load acting on the left end of the transmission bolt 1 does not disappear, the limiting device 6 limits the rotating rocker arm 3 to be incapable of continuously rotating, and the stroke of the compression trigger sensor 8 is kept unchanged all the time; when the external load disappears, the energy absorption spring 2 drives the transmission bolt 1 to reset, the reset spring 7 enables the rotating rocker arm 3 to rotate in the opposite direction, and the contact of the touch head 9 is separated from the sensor, so that the sensor is switched on and off.

The utility model has the advantages of it is following:

the utility model discloses be equipped with the drive bolt that can axial motion on the rocking arm of rotation, be equipped with energy-absorbing spring between rocking arm of rotation and drive bolt, be equipped with reset spring at the other end of rocking arm of rotation to be provided with the stopper, protect the trigger type sensor not to damage through the device that is equipped with spring energy-absorbing, the stop device of rocking arm of rotation 3 can guarantee that the stroke of compression trigger type sensor 8 keeps invariable, protects the trigger type sensor not to damage; when heavy load and impact load act, the energy-absorbing spring 2 only acts on the transmission bolt 1 and cannot be transmitted to the sensor, so that the sensor can be prevented from being damaged due to overload and impact; meanwhile, the reliability of signal triggering influenced by structural deformation caused by heavy load and impact is eliminated; the maximum load that the swing arm 3 receives is the spring force of the energy-absorbing spring 2, and the spring force of the energy-absorbing spring 2 is smaller, do benefit to the sufficient structural rigidity of design in order to guarantee that the stroke of the trigger sensor 8 is not influenced by structural deformation, solved under heavy load and impact environment, avoid the load to act on the sensor directly, the utility model discloses utilize the swing arm of lever type, through the drive bolt absorption impact energy who is equipped with the energy-absorbing spring, utilize the stop device of the other end of rocker arm, prevent that the impact load from acting on the sensor directly, and the energy-absorbing spring has protected the sensor trigger device to receive the heavy load and damage; after the load is removed, a sensor trigger block arranged on the rotating rocker arm can be separated from the sensor by using a return spring at the sensor end, and the signal trigger device is reset. The utility model discloses can also utilize the compression stroke that drive bolt 1 can suitably increase the load, do benefit to the adjustment of sensor, improve the reliability of sensor switch-on under the vibration simultaneously.

Drawings

Fig. 1 is a schematic structural diagram of the overload protection device of the sensor of the present invention. The trigger signal is an overload protection device schematic diagram.

In the figure: the energy-absorbing device comprises a transmission bolt 1, an energy-absorbing spring 2, a rotating rocker arm 3, a fastening piece 4, a rotating shaft 5, a limiting device 6, a return spring 7, a trigger sensor 8, a touch head 9 and a guide hole 10.

The present invention is further described with reference to the following figures and examples, but the invention is not limited thereby within the scope of the described embodiments. All of these concepts should be considered within the scope of the present disclosure.

Detailed Description

See fig. 1. In the following embodiments described below, a sensor overload protection device is provided, in which a transmission bolt 1 capable of moving axially is mounted on a swing arm 3, an energy absorbing spring 2 is mounted between the swing arm 3 and the transmission bolt 1, a return spring 7 is mounted at the other end of the swing arm, and a limiting device 6 is provided, the elastic force of the energy absorbing spring 2 is greater than the sum of the working pressure of the return spring 7 and the rotational friction force of the swing arm 3, when a load acts on the left end of the transmission bolt 1, the swing arm 3 rotates along a rotating shaft 5 to compress the return spring 7, and at this time, under the action of the energy absorbing spring 2, no axial relative displacement is generated between the transmission bolt 1 and the swing arm 3. After the rotating rocker arm 3 continues to rotate to the limiting device 6, the trigger type sensor 8 is in signal connection, if the load acting on the left end of the transmission bolt 1 does not disappear, the rotating rocker arm 3 cannot continue to rotate under the limiting of the limiting device 6, the stroke of the compression trigger type sensor 8 is always kept unchanged, when the external load exceeds the elastic force of the energy-absorbing spring 2, the energy-absorbing spring 2 is compressed, and the transmission bolt 1 axially moves along the guide hole 10 on the rotating rocker arm 3. After the external load is removed, the energy absorption spring 2 drives the transmission bolt 1 to reset, the reset spring 7 enables the rotary rocker arm 3 to rotate in the opposite direction, and the contact on the rotary rocker arm 3 is separated from the sensor, so that the sensor is switched on and off.

The foregoing is directed to the preferred embodiment of the present invention, and it is noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.

Claims (2)

1. A sensor overload protection device having a rotating rocker arm (3) with a trip head (9) formed on the arm body, characterized in that: the arm end of the rotating rocker arm (3) is provided with a transmission bolt (1) parallel to the trigger sensor (8) and an energy absorption spring (2) sleeved on the bolt shaft, the touch head (9) faces to the sensing surface of the trigger sensor (8), a reset spring (7) fixedly connected to the arm body of the rotating rocker arm (3) and a limiting device (6) located below the reset spring (7) and facing to the arm body of the rotating rocker arm (3) are arranged below the touch head (9), the transmission bolt (1) capable of axially moving are arranged, under the action of load, the energy absorption spring (2) assembled between the rotating rocker arm (3) and the transmission bolt (1) enables the rotating rocker arm (3) to clockwise rotate along a rotating shaft (5) on the arm body to compress the reset spring (7), the tail end of the rotating rocker arm (3) is driven to rotate towards the limiting device (6), and the compressed energy absorption spring (2) pushes the transmission bolt (1) to rotate along a guide hole (10) in the rotating rocker arm (3) ) The energy absorption spring (2) drives the transmission bolt (1) to reset after carrying out axial movement, and the rotating rocker arm (3) rotates along the opposite direction to control the connection and disconnection of the sensor.

2. The sensor overload protection apparatus of claim 1, wherein: the elastic force of the energy-absorbing spring (2) is larger than the sum of the working pressure of the return spring (7) and the rotating friction force of the rotating rocker arm (3).

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