CN107590932B

CN107590932B - Door plug alarm

Info

Publication number: CN107590932B
Application number: CN201710812089.5A
Authority: CN
Inventors: 王忠琦
Original assignee: Ningbo Hi Tech Zone Inno Technology Co ltd
Current assignee: Ningbo Hi Tech Zone Inno Technology Co ltd
Priority date: 2016-08-29
Filing date: 2016-08-29
Publication date: 2020-09-18
Anticipated expiration: 2036-08-29
Also published as: CN107590932A; CN106285263B; CN106285263A

Abstract

The invention discloses a door plug alarm, which comprises a base body, wherein a wedge surface is formed at the top of the base body, an elastic pressing plate is arranged above the wedge surface of the base body, one side end part of the elastic pressing plate is inserted into one side end part on the base body, the base body applies a rotating torque force to the elastic pressing plate to ensure that the elastic pressing plate and the wedge surface always keep an included angle, an alarm device, a battery, a storage unit, a controller and a detection unit with a telescopic detection rod are arranged in the base body, a through hole is formed in the wedge surface of the base body, a telescopic trigger connecting rod penetrates through the through hole, the top of the trigger connecting rod is ensured to be contacted with the bottom surface of the elastic pressing plate under the action of a first reset spring, and the bottom end of the trigger connecting rod is arranged above the telescopic; this detecting element can turn into the displacement volume of telescopic test rod the signal of telecommunication input to controller, and when detecting element detected that the elastic pressing plate has the displacement change, the controller control alarm device reported to the police. The door plug alarm solves the technical problem of improving the alarm sensitivity of the door plug alarm, and has wide market application prospect.

Description

Door plug alarm

The present patent application is a divisional application of the invention patent application (application No. 2016107670268 entitled "door stopper alarm", filed 2016-8-29).

Technical Field

The invention relates to an anti-theft alarm device, in particular to a door plug alarm.

Background

When the door is in an open or closed state, the traditional door plug alarm can only achieve the purpose of stopping the door. However, with the development of modern society, the door plug alarm with a single function cannot meet the requirements of people in daily life, and people need a door plug alarm with more functions. Especially, family theft in modern society often happens, which poses great threat to personal and property safety of people.

In view of the above situation, a burglarproof alarm door plug is provided in the published chinese utility model patent document with patent number 201520141484.1. The structure of the alarm device comprises an alarm horn for realizing alarm, a power supply device for supplying power to the alarm horn, a switch for controlling the alarm horn and a bump which is fixed on an elastic contact plate and is used for triggering the switch when the elastic contact plate is pressed down. The working principle is as follows: firstly, the anti-theft alarm door plug with the structure is inserted into a door gap after the door is closed, and the elastic contact plate is not stressed due to the fact that the door does not apply pressure to the door plug at the moment, a bump on the elastic contact plate cannot squeeze the switch, and the whole circuit cannot be connected. When someone wants to open the door by force outside the door, the door stopper receives the pressure that the door was applyed, and elastic contact plate will receive pressure application lug and close the switch, and whole circuit switch-on, warning loudspeaker will send the warning sound, realize reporting to the police and remind the function.

However, the burglar alarm door plug with the structure has an obvious technical defect, and the technical defect is that the burglar alarm door plug with the structure is inserted into a door gap when in use, and only can prevent an outsider from forcibly opening the door and entering a room, and under the condition that the gap distance between the traditional door body and the ground is relatively large, when the outsider ejects the door plug with the structure from the door gap in advance by hands or a self-contained tool, the outsider opens the door at the moment, and the door plug cannot bear the pressure applied by the door, namely the door plug with the structure loses the original alarm reminding function.

Accordingly, the applicant has determined that there is a need for further structural design improvements to prior art door plug alarms.

Disclosure of Invention

The invention aims to solve the defects of the prior art and provide a door plug alarm with high alarm sensitivity.

In order to achieve the purpose, the door plug alarm designed by the invention comprises a base body, wherein the height from the center or one side end part of the base body to the other side end part of the base body is gradually reduced, a wedge surface is formed on the top surface of the base body, an elastic pressing plate is arranged above the wedge surface of the base body, one side end part of the elastic pressing plate is inserted into the end part of one side of the base body with smaller relative height, the base body applies a rotating torque force to the elastic pressing plate to ensure that the elastic pressing plate and the wedge surface always keep an included angle, and an alarm device is arranged in the base body; a through hole is formed in the wedge surface of the base body, a telescopic trigger connecting rod penetrates through the through hole, and the top of the trigger connecting rod is ensured to be in contact with the bottom surface of the elastic pressing plate under the action of a first return spring; the base body is also internally provided with a battery, a storage unit and a controller, the battery is used for supplying power, the controller is connected with the storage unit, and the output of the controller controls the alarm device; a detection unit with a telescopic detection rod is further arranged in the base body, and the bottom end of the trigger connecting rod is arranged above the telescopic detection rod and is in contact with the telescopic detection rod; the detection unit can convert the displacement of the telescopic detection rod into an electric signal to be input to the controller, and when the detection unit detects that the elastic pressing plate has displacement change, the controller controls the alarm device to give an alarm.

The controller compares and judges two electric signals to control output, wherein the electric signals refer to current values, voltage values and the like.

According to the door plug alarm provided by the invention, the detection unit is additionally arranged in the base body, and the detection unit is used for detecting and judging whether the elastic pressing plate of the door plug alarm has micro displacement change in the using process, so that the controller controls the alarm device to give an alarm. The detection unit detects that the elastic pressing plate has micro displacement change and then controls the alarm device to give an alarm through the controller according to the following specific principle: in the using process, the door plug alarm with the structure is inserted into a door seam formed between a door body and the ground, and an initial acting force is applied to an elastic pressing plate of the door plug alarm by the door body, at the moment, a specific included angle is formed between the elastic pressing plate and a wedge surface on a base body, a trigger connecting rod on the elastic pressing plate drives a telescopic detection rod on a detection unit, the telescopic detection rod generates a displacement variable, the displacement variable is converted into an electric signal by the detection unit, then the electric signal is input to a controller, and the electric signal is used as the displacement initial value of the elastic pressing plate and is stored in a storage unit; then, when the door plug alarm generates a displacement change under the action of external force in the using process of the door plug alarm, the external acting force of the door body on the elastic pressure plate of the door plug alarm is changed inevitably, the change of the acting force can cause the angle value of a specific included angle formed by the elastic pressing plate and the wedge surface on the base body to change, the trigger connecting rod on the elastic pressing plate can drive the telescopic detection rod on the detection unit again synchronously, at the moment, the controller can receive an electric signal corresponding to the displacement variable value of the telescopic detection rod again, then the controller can compare the electric signal corresponding to the displacement variable value with the electric signal corresponding to the displacement initial value in the storage unit, and if the two values are not consistent, the controller controls the alarm device to alarm.

The door plug alarm provided by the invention has the advantages that the external acting force originally applied to the elastic pressing plate of the door body can be changed when the door body is subjected to displacement change in the using process, the detection unit can detect the signal variable, and the door plug alarm is controlled to give an alarm through the controller. Therefore, the door stopper alarm of above-mentioned structure possesses higher alarm sensitivity relatively in the in-service use, and the door body possesses higher safety protection level relatively with the door stopper alarm cooperation of this structure after using.

Preferably, the detection unit of the present invention comprises a cover, a housing, a telescopic detection rod, a pressure sensor, a pressure transmitter, a rubber sheet with a boss, and a detection spring, wherein the cover is disposed on the upper portion of the housing, the telescopic detection rod passes through the cover, a lower cover is disposed on the lower portion of the telescopic detection rod, the rubber sheet of the boss is disposed on the detection surface of the pressure sensor, the detection spring is disposed on the boss of the rubber sheet and located in the lower cover, the height of the boss is smaller than that of the detection spring, a signal of the pressure sensor is input to the pressure transmitter, and a signal of the pressure transmitter is input to the controller.

In the preferred embodiment, the detection unit detects that the elastic pressing plate has micro displacement change, and then the controller controls the alarm device to give an alarm according to the following specific principle: in the using process, the door plug alarm with the structure is inserted into a door seam formed between a door body and the ground, and an initial acting force is applied to an elastic pressing plate of the door plug alarm by the door body, at the moment, a specific included angle is formed between the elastic pressing plate and a wedge surface on a base body, a trigger connecting rod on the elastic pressing plate drives a telescopic detection rod on a detection unit, the telescopic detection rod generates a displacement variable, a synchronous pressure sensor can detect an initial pressure value, the pressure transmitter converts the initial pressure value into an initial electric signal, the initial electric signal is input to a controller, and the initial electric signal is stored in a storage unit as an initial displacement value of the elastic pressing plate; then, when the door plug alarm generates a displacement change under the action of external force in the using process of the door plug alarm, the external acting force of the door body on the elastic pressure plate of the door plug alarm is changed inevitably, the change of the acting force can cause the angle value of a specific included angle formed by the elastic pressing plate and the wedge surface on the base body to change, the trigger connecting rod on the elastic pressing plate can drive the telescopic detection rod on the detection unit again, at the moment, the controller can receive an electric signal variable sent by a pressure transmitter again to serve as the displacement variable value of the elastic pressing plate, then the controller can compare the displacement variable value with the displacement initial value in the storage unit, and if the two values are not consistent, the controller controls the alarm device to give an alarm.

Another technical preference is that the detection unit of the invention is composed of a cover body, a shell, a telescopic detection rod, a piezoelectric ceramic piece, a fixed seat, a rubber piece with a boss, a detection spring and a circuit board, wherein the cover body is arranged at the upper part of the shell, the telescopic detection rod penetrates through the cover body, a lower cover is arranged at the lower part of the telescopic detection rod, the piezoelectric ceramic piece, the fixed seat and the circuit board are positioned in the shell, the rubber piece with the boss is arranged on the piezoelectric ceramic piece, the piezoelectric ceramic piece is fixed on the fixed seat, the detection spring is arranged on the boss of the rubber piece and is positioned in the lower cover body, and the boss is shorter than the detection spring; be equipped with amplifier circuit and AD converting circuit on the circuit board, the piezoceramics piece passes through amplifier circuit and connects AD converting circuit, AD converting circuit's output signal input extremely the controller.

In the preferred embodiment, the detection unit detects that the elastic pressing plate has micro displacement change, and then the controller controls the alarm device to give an alarm according to the following specific principle: in the using process, the door plug alarm with the structure is inserted into a door seam formed between a door body and the ground, and an initial acting force is applied to an elastic pressing plate of the door plug alarm by the door body, at the moment, a specific included angle is formed between the elastic pressing plate and a wedge surface on a base body, a trigger connecting rod on the elastic pressing plate drives a telescopic detection rod on a detection unit, the telescopic detection rod generates a displacement variable, the synchronous piezoelectric ceramic piece outputs an initial electric signal, an AD conversion circuit is carried out after the initial electric signal is amplified by a fruit and fruit amplification circuit, the initial electric signal is converted into a digital signal which is easier to identify by a controller and is input to the controller, and the digital signal is stored in a storage unit as an initial displacement value of the elastic pressing plate; then, when the door plug alarm generates a displacement change under the action of external force in the using process of the door plug alarm, the external acting force of the door body on the elastic pressure plate of the door plug alarm is changed inevitably, the change of the acting force can cause the change of an angle value of a specific included angle formed by the elastic pressure plate and a wedge surface on the base body, the synchronous trigger connecting rod on the elastic pressure plate can drive the telescopic detection rod on the detection unit again, at the moment, the controller can receive a digital signal variable sent by the piezoelectric ceramic piece again and obtained through amplification and AD (analog-to-digital) conversion as a displacement variable value of the elastic pressure plate, then the controller can compare the displacement variable value with a displacement initial value in the storage unit, and if the two values are not consistent, the controller can control the alarm device to give an alarm.

Another technical preference is that the detection unit of the present invention is composed of a telescopic detection rod, a frame support, a guide rail, a pair of sliders, a pair of metal frames, a pair of metal clamping plates, and a linear displacement sensor, wherein the frame support is fixed on the base, the guide rail is fixed on the inner wall of one side of the frame support, the guide groove on the guide rail faces the opposite side of the base, the pair of sliders are movably connected to the guide rail and can respectively perform displacement adjustment along the guide groove, each slider can be locked once adjusted to a set position, each slider is fixed with one metal frame, each metal frame is fixed with one metal clamping plate, a plug-in port is formed between the pair of metal clamping plates, the telescopic detection rod is inserted into the plug-in port, and a taper is provided in the axial direction of the telescopic detection rod, and the single side is fixed with the elastic pressing plate, one side frame used for fixing the metal clamping plate on each metal frame body and one side frame used for fixing the metal clamping plate with the sliding block are symmetrical, at least one deformation section with the thickness of 0.5-1.5 mm is arranged on the other symmetrical side frame of any one metal frame body, an installation plate is fixed on the outer side of the metal frame body, a step shaft is fixed on the installation plate and vertically penetrates through any deformation section on the metal frame, a second reset spring and a trigger rod are sleeved on the step shaft part of the step shaft, the step shaft is locked by a stop nut on the outer side, the trigger rod is positioned between the second reset spring and the stop nut, the linear displacement sensor is connected to the trigger rod in a propping manner, and the signal of the linear displacement sensor is input to the controller.

In the preferred technical scheme, the detection unit detects that the elastic pressing plate has micro displacement change, and then the controller controls the alarm device to give an alarm according to the following specific principle: in the using process, the door plug alarm with the structure is inserted into a door seam formed between a door body and the ground, and an initial acting force is applied to an elastic pressing plate of the door plug alarm by the door body, at the moment, the elastic pressing plate and a wedge surface on a base body form a specific included angle, a trigger connecting rod on the elastic pressing plate drives a telescopic detection rod on a detection unit, the telescopic detection rod generates a displacement variable, a pair of metal frames are fixed to sliding blocks on one side and the sliding blocks are locked on a guide rail in consideration of certain taper formed by the telescopic detection rod in the preferred scheme in the axial direction, so that only the line variable section on a pair of side frames on one metal frame body is bent to cause the whole corresponding metal frame body to generate single-side offset along with the displacement change of the telescopic detection rod, and the size value between a pair of metal clamping plates is changed along with the displacement change of the telescopic detection rod, the single-side offset of the metal frame body can also synchronously generate a single-side offset for the trigger rod fixed with the corresponding metal frame body, and the single-side offset of the trigger rod is captured by the linear displacement sensor, is input to the controller in the form of an electric signal and is stored in the storage unit as the initial displacement value of the elastic pressure plate; then, when the door plug alarm generates a displacement change under the action of external force in the using process of the door plug alarm, the external acting force of the door body on the elastic pressure plate of the door plug alarm is changed inevitably, the change of the acting force can cause the angle value of a specific included angle formed by the elastic pressing plate and the wedge surface on the base body to change, the synchronous trigger connecting rod on the elastic pressing plate can drive the telescopic detection rod on the detection unit again, at the moment, the controller can receive an electric signal variable sent by the linear displacement sensor again to serve as a displacement variable value of the elastic pressing plate, then the controller can compare the displacement variable value with the displacement initial value in the storage unit, and if the two values are not consistent, the controller controls the alarm device to give an alarm.

In order to promote the deformation sensitivity of the upward deformation section of the corresponding metal frame body, at least one notch is arranged on the deformation section of the metal frame body, and the entity area of the upward deformation section can be relatively reduced by the notch, so that under relatively smaller acting force, the deformation section with the notch can be sensitively sensed, and the synchronous completion and the deformation bias consistent with the stress direction are realized.

Compared with an anti-theft alarm door plug in the prior art, the door plug alarm has higher anti-theft alarm sensitivity, and particularly, in the specific use process of the door plug alarm, as long as the whole door plug alarm generates displacement, the door plug alarm can immediately alarm and ring to prompt a user to have potential safety hazards, so that after a door body is closed, the door plug alarm provided by the invention is inserted into a door seam, and people inside and outside the door cannot open the corresponding door body under the condition that the door plug alarm is not triggered to alarm.

Drawings

Fig. 1 is a schematic structural diagram of a door plug alarm provided in embodiment 1;

fig. 2 is a system diagram of a control portion in the door stopper alarm provided in embodiment 1;

fig. 3 is a schematic structural diagram of a detection unit in the door plug alarm provided in embodiment 1;

fig. 4 is a schematic structural diagram of a detection unit in the door stopper alarm provided in embodiment 2;

fig. 5 is a schematic structural diagram of a detection unit in the door plug alarm provided in embodiment 3;

FIG. 6 is an enlarged partial schematic view at A of FIG. 5;

fig. 7 is a partially enlarged schematic structural diagram of a detection unit in the door plug alarm provided in embodiment 4.

In the figure: the device comprises a base body 1, a wedge surface 2, an elastic pressing plate 3, an alarm device 4, a through hole 5, a trigger connecting rod 6, a first return spring 7, a battery 8, a storage unit 9, a controller 10, a cover body 11, a shell body 12, a telescopic detection rod 13, a pressure sensor 14, a pressure transmitter 15, a boss 16, a rubber sheet 17, a detection spring 18, a lower cover 19, a piezoelectric ceramic sheet 20, a fixed seat 21, a circuit board 22, an amplifying circuit 23, an AD conversion circuit 24, a frame support 25, a guide rail 26, a slide block 27, a metal frame 28, a metal clamping plate 29, a linear displacement sensor 30, a guide groove 31, a plug interface 32, a deformation section 33, an installation plate 34, a step shaft 35, an upper step shaft part 36, a second return spring 37, a trigger rod 38, a stop nut 39, a notch 40 and a detection unit.

Detailed Description

The invention is further illustrated with reference to the following figures and examples.

Example 1:

as shown in fig. 1-3, the door plug alarm provided in this embodiment includes a base 1, a height of one side end of the base 1 gradually decreases from the other side end, and a wedge surface 2 is formed on a top surface of the base, an elastic pressing plate 3 is disposed above the wedge surface 2 of the base 1, one side end of the elastic pressing plate 3 is inserted into one side end of the base 1 with a relatively small height, and the base 1 applies a rotational torque to the elastic pressing plate 3 to ensure that the elastic pressing plate 3 and the wedge surface 2 always maintain an included angle, and an alarm device 4 is disposed in the base 1; a through hole 5 is arranged on the wedge surface 2 of the base body 1, a telescopic trigger connecting rod 6 penetrates through the through hole 5, and the top of the trigger connecting rod 6 is ensured to be contacted with the bottom surface of the elastic pressing plate 3 under the action of a first reset spring 7; a battery 8, a storage unit 9 and a controller 10 are further arranged in the base body 1, the battery 8 is used for supplying power, the controller 10 is connected with the storage unit 9, and the output of the controller 10 controls the alarm device 4; a detection unit is also arranged in the base body 1;

the detection unit comprises a cover body 11, a shell body 12, a telescopic detection rod 13, a pressure sensor 14, a pressure transmitter 15, a rubber sheet 17 with a boss 16 and a detection spring 18, wherein the cover body 11 is arranged on the upper part of the shell body 12, the telescopic detection rod 13 penetrates through the cover body 11, a lower cover 19 is arranged on the lower part of the telescopic detection rod 13, the rubber sheet 17 of the boss 16 is arranged on a detection surface of the pressure sensor 14, the detection spring 18 is arranged on the boss 16 of the rubber sheet 17, the detection spring 18 is positioned in the lower cover 19 11, the height of the boss 16 is smaller than that of the detection spring 18, a signal of the pressure sensor 14 is input to the pressure transmitter 15, and a signal of the pressure transmitter 15 is input to the controller 10.

The specific principle that the detection unit detects that the elastic pressing plate 3 has micro displacement change and then controls the alarm device 4 to give an alarm through the controller 10 is as follows: in the using process, the door plug alarm with the structure is inserted into a door seam formed between a door body and the ground, and an initial acting force is applied to an elastic pressing plate 3 of the door plug alarm by the door body, at the moment, a specific included angle is formed between the elastic pressing plate 3 and a wedge surface 2 on a base body 1, a trigger connecting rod 6 on the elastic pressing plate 3 drives a telescopic detection rod 13 on a detection unit, the telescopic detection rod 13 generates a displacement variable, a synchronous pressure sensor 14 detects an initial pressure value, the initial pressure value is converted into an initial electric signal by a pressure transmitter 15, the initial electric signal is input to a controller 10, and the initial electric signal is stored in a storage unit 9 as the initial displacement value of the elastic pressing plate 3; then, when the door plug alarm generates a displacement change under the action of external force in the using process of the door plug alarm, the external acting force of the door body on the elastic pressure plate 3 of the door plug alarm is changed, the change of the acting force can cause the change of the angle value of a specific included angle formed by the elastic pressing plate 3 and the wedge surface 2 on the base body 1, the synchronous trigger connecting rod 6 on the elastic pressing plate 3 can drive the telescopic detection rod 13 on the detection unit again, at the moment, the controller 10 can receive an electric signal variable sent by a pressure transmitter 15 again to serve as the displacement variable value of the elastic pressing plate 3 at the moment, then the controller 10 can compare the displacement variable value with the displacement initial value in the storage unit 9, and if the two values are not consistent, the controller 10 can control the alarm device 4 to give an alarm.

Example 2:

the general structure of a door plug alarm provided in this embodiment is the same as that of embodiment 1, as shown in fig. 4, but in this embodiment, the detection unit is composed of a cover 11, a housing 12, a telescopic detection rod 13, a piezoelectric ceramic plate 20, a fixing seat 21, a rubber sheet 17 with a boss 16, a detection spring 18, and a circuit board 22, the cover 11 is disposed on the upper portion of the housing 12, the telescopic detection rod 13 penetrates through the cover 11, a lower cover 19 is disposed on the lower portion of the telescopic detection rod 13, the piezoelectric ceramic plate 20, the fixing seat 21, and the circuit board 22 are disposed in the housing 12, the rubber sheet 17 with the boss 16 is disposed on the piezoelectric ceramic plate 20, the piezoelectric ceramic plate 20 is fixed on the fixing seat 21, the detection spring 18 is disposed on the boss 16 of the rubber sheet 17, and the detection spring 18 is disposed in the lower cover 19, and the height of the boss 16 is smaller than that of the detection spring 18; the circuit board 22 is provided with an amplifying circuit 23 and an AD conversion circuit 24, the piezoelectric ceramic piece 20 is connected with the AD conversion circuit 24 through the amplifying circuit 23, and an output signal of the AD conversion circuit 24 is input to the controller 10.

The specific principle that the detection unit detects that the elastic pressing plate 3 has micro displacement change and then controls the alarm device 4 to give an alarm through the controller 10 is as follows: in the using process, the door plug alarm with the structure is inserted into a door seam formed between a door body and the ground, and an initial acting force is applied to an elastic pressing plate 3 of the door plug alarm by the door body, at the moment, a specific included angle is formed between the elastic pressing plate 3 and a wedge surface 2 on a base body 1, a trigger connecting rod 6 on the elastic pressing plate 3 drives a telescopic detection rod 13 on a detection unit, the telescopic detection rod 13 generates a displacement variable, a synchronous piezoelectric ceramic piece 20 outputs an initial electric signal, after the initial electric signal is amplified by an effect amplifying circuit 23, an AD conversion circuit 24 is carried out to convert the initial electric signal into a digital signal which is easier to identify by a controller 10, the digital signal is input to the controller 10, and the digital signal is stored in a storage unit 9 as an initial displacement value of the elastic pressing plate 3; then, in the use process of the door plug alarm, once the door plug alarm generates a displacement change under the action of an external force, the external force applied to the elastic pressing plate 3 of the door plug alarm by the door body originally generates a slight change, the change of the external force will cause the change of the angle value of a specific included angle formed by the elastic pressing plate 3 and the wedge surface 2 on the base body 1, the synchronous trigger connecting rod 6 on the elastic pressing plate 3 will drive the telescopic detection rod 13 on the detection unit again, at this time, the controller 10 will receive a digital signal variable sent by the piezoelectric ceramic plate 20 and obtained through amplification and AD analog-to-digital conversion again as the displacement variable value of the elastic pressing plate 3, and then the controller 10 will compare the displacement variable value with the displacement initial value in the storage unit 9, if the two values are not consistent, the controller 10 controls the alarm device 4 to alarm.

Example 3:

in the present embodiment, the general structure of the door plug alarm is the same as that of embodiment 1, as shown in fig. 5 and 6, but in the present embodiment, the detection unit is composed of a telescopic detection rod 13, a frame bracket 25, a guide rail 26, a pair of sliding blocks 27, a pair of metal frames 28, a pair of metal clamping plates 29 and a linear displacement sensor 30, the frame bracket 25 is fixed on the base 1, the guide rail 26 is fixed on one side inner wall of the frame bracket 25, a guide groove 31 on the guide rail 26 faces the opposite side of the base 1, a pair of the sliding blocks 27 are movably connected to the guide rail 26 and can be respectively adjusted in displacement along the guide groove 31, each sliding block 27 can be locked once adjusted to a set position, one of the metal frames 28 is fixed on each sliding block 27, one of the metal clamping plates 29 is fixed on each metal frame 28, a plug-in port 32 is formed between a pair of metal clamping plates 29, the telescopic detection rod 13 is inserted into the plug-in port 32, and is provided with a taper in the axial direction, one side of the telescopic detection rod is fixed with the elastic pressing plate 3, one side frame for fixing the metal clamping plate 29 on each metal frame 28 is symmetrical to one side frame for fixing with the sliding block 27, wherein the other symmetrical side frame of the metal frame 28 on the left side is provided with a pair of deformation sections 33 with the thickness of 0.5-1.5 mm, the outer side of the metal frame 28 is fixed with a mounting plate 34, the mounting plate 34 is fixed with a step shaft 35, the step shaft 35 vertically penetrates through one deformation section 33 on the metal frame, and a second return spring 37 and a trigger rod 38 are sleeved and connected on the upper step shaft part 36, and are locked by a stop nut 39 on the outer side, the trigger rod 38 is located between the second return spring 37 and the stop nut 39, the linear displacement sensor 30 is abutted on the trigger rod 38, and the signal of the linear displacement sensor 30 is input to the controller 10.

The specific principle that the detection unit detects that the elastic pressing plate 3 has micro displacement change and then controls the alarm device 4 to give an alarm through the controller 10 is as follows: in the using process, the door plug alarm with the structure is inserted into a door seam formed between a door body and the ground, and it is to be ensured that the door body exerts an initial acting force on the elastic pressing plate 3 of the door plug alarm, at this time, the elastic pressing plate 3 and the wedge surface 2 on the base body 1 form a specific included angle, the trigger connecting rod 6 on the elastic pressing plate 3 drives the telescopic detection rod 13 on the detection unit, the telescopic detection rod 13 generates a displacement variable, considering that the telescopic detection rod 13 in the preferred scheme forms a certain taper in the axial direction, a pair of metal frames are both fixed to the sliding block 27 on one side, and a pair of sliding blocks 27 are locked on the guide rail 26, so that along with the displacement change of the telescopic detection rod 13, only the deformation section on a pair of side frames on one of the metal frames 28 is bent to cause the single-side offset of the corresponding metal frame 28 as a whole, therefore, the size value of the socket between the pair of metal clamping plates 29 changes along with the displacement change of the telescopic detection rod 13, and the unilateral offset of the metal frame 28 synchronously causes the trigger rod 38 fixed with the corresponding metal frame 28 to generate unilateral offset, and the unilateral offset of the trigger rod 38 is captured by the linear displacement sensor 30, is input to the controller 10 in the form of an electric signal and is stored in the storage unit 9 as the initial displacement value of the elastic pressing plate 3; then, when the door plug alarm generates a displacement change under the action of external force in the using process of the door plug alarm, the external acting force of the door body on the elastic pressure plate 3 of the door plug alarm is changed, the micro-change of the acting force can cause the angle value of a specific included angle formed by the elastic pressing plate 3 and the wedge surface 2 on the base body 1 to change, the synchronous trigger connecting rod 6 on the elastic pressing plate 3 can drive the telescopic detection rod 13 on the detection unit again, at the moment, the controller 10 can receive an electric signal variable sent by the linear displacement sensor 30 again to serve as the displacement variable value of the elastic pressing plate 3 at the moment, then the controller 10 can compare the displacement variable value with the initial displacement value in the storage unit 9, and if the two values are not consistent, the controller 10 can control the alarm device 4 to give an alarm.

Example 4:

the general structure of the door plug alarm provided in this embodiment is the same as that of embodiment 1, as shown in fig. 7, but in order to improve the deformation sensitivity of the upward deformation section of the corresponding metal frame 28, in this embodiment, a notch 40 is provided on the deformation section 33 of the metal frame 28, and the setting of the notch 40 can relatively reduce the physical area of the upward deformation section, so that under relatively smaller acting force, the deformation section 33 provided with the notch 40 can both sense sensitively, and synchronously complete the deformation offset in the same direction as the force.

Claims

1. A door plug alarm comprises a base body, wherein the height from the center or one side end part of the base body to the other side end part of the base body is gradually reduced, a wedge surface is formed on the top surface of the base body, an elastic pressing plate is arranged above the wedge surface of the base body, one side end part of the elastic pressing plate is inserted into the end part of one side of the base body with the relatively small height, the base body applies a rotating torque force to the elastic pressing plate to ensure that the elastic pressing plate and the wedge surface always keep an included angle, and an alarm device is arranged in the base body; a through hole is formed in the wedge surface of the base body, a telescopic trigger connecting rod penetrates through the through hole, and the top of the trigger connecting rod is ensured to be in contact with the bottom surface of the elastic pressing plate under the action of a first return spring; the intelligent alarm device is characterized in that a battery, a storage unit and a controller are further arranged in the base body, the battery is used for supplying power, the controller is connected with the storage unit, and the output of the controller controls the alarm device; a detection unit with a telescopic detection rod is further arranged in the base body, and the bottom end of the trigger connecting rod is arranged above the telescopic detection rod and is in contact with the telescopic detection rod; the detection unit can convert the displacement of the telescopic detection rod into an electric signal to be input to the controller, and when the detection unit detects that the elastic pressing plate has displacement change, the controller controls the alarm device to give an alarm; the detection unit is characterized by comprising a cover body, a shell, a telescopic detection rod, a piezoelectric ceramic piece, a fixed seat, a rubber piece with a boss, a detection spring and a circuit board, wherein the cover body is arranged at the upper part of the shell; be equipped with amplifier circuit and AD converting circuit on the circuit board, the piezoceramics piece passes through amplifier circuit and connects AD converting circuit, AD converting circuit's output signal input extremely the controller.