CN115527338A - Safety alarm device of electronic platform - Google Patents

Abstract

The invention relates to the technical field of electronic stations, in particular to a safety alarm device of an electronic station, which comprises a support arm member, a pull rope, a linkage member and an alarm unit; one end of the pull rope is arranged on the first support arm to form a positioning section, the other end of the pull rope movably bypasses the second support arm to form a traction section, and the pull rope forms a holding section arranged along the length direction of the crosspiece between the first support arm and the second support arm; when the holding section is stressed and deformed, the traction section pulls the movable block to move from the initial position to the triggering position, and the elastic piece is used for providing elastic force to drive the movable block to reset; when the movable block is at the trigger position, the detection piece is triggered, and the player responds to the detection piece and broadcasts the warning voice. The invention can send out alarm voice when passengers depend on the guardrail so as to remind the passengers not to depend on the guardrail.

Description

Safety alarm device of electronic platform

Technical Field

The invention relates to the technical field of electronic stations, in particular to a safety alarm device of an electronic station.

Background

Along with the progress of science and technology, in order to make the passenger have the information of riding a bus of better understanding, a lot of places convert traditional bus stop into electronic platform, can carry on electronic display screen usually on the electronic platform, can show bus arrival information in real time.

In order to prevent passengers from randomly crossing over the platform and stepping on the highway, a guardrail is usually arranged on one side of the platform close to the highway to block the passengers; but discovery when practical application, a lot of passengers can rely on the guardrail when waiting for the bus, and the guardrail is often relied on to make the guardrail appear not hard up easily to form the potential safety hazard, be unfavorable for passenger's safety, consequently need improve current bus stop, with send safety warning when the passenger relies on the guardrail, remind the passenger not to rely on the guardrail.

Disclosure of Invention

In order to solve at least one of the technical problems mentioned in the background, an object of the present invention is to provide a security alarm device for an electronic platform.

In order to achieve the purpose, the invention provides the following technical scheme:

a security alarm device for an electronic platform for mounting on a barrier of the electronic platform, the barrier including two uprights and a crosspiece fixed between the uprights, the security alarm device comprising:

the support arm component comprises a first support arm and a second support arm which are respectively arranged on the two upright posts;

the pull rope is arranged between the first support arm and the second support arm to form a holding section arranged along the length direction of the crosspiece, and the positioning section at least comprises a positioning point which is positioned relative to the upright post in a holding manner;

the linkage component is arranged on the stand column provided with the second support arm and comprises a base body, a movable block and an elastic piece, the base body is fixed with the stand column, the movable block can move between an initial position and a triggering position along the base body, the movable block is connected with the traction section, when the maintaining section is deformed under stress, the traction section pulls the movable block to move from the initial position to the triggering position, and the elastic piece is used for providing elastic force to drive the movable block to reset;

and the alarm unit comprises a detection piece and a player for broadcasting alarm voice, wherein the detection piece is arranged on the linkage member, when the movable block is positioned at the trigger position, the detection piece is triggered, and the player responds to the detection piece to broadcast the alarm voice.

Preferably, the movable block can perform linear movement between the initial position and the triggering position along the vertical direction relative to the base body.

Preferably, a vertically extending slideway is arranged in the base body, and the movable block is arranged in the slideway in a sliding manner; the end part of the traction section penetrates into the slideway through the top of the base body in a vertical movable manner and is fixed with the movable block, or the end part of the traction section is connected with the movable block through a vertically arranged pull rod, wherein the pull rod can move in the vertical direction relative to the base body.

Preferably, the outer side of the second support arm is fixedly connected with a guide ring, and the traction section movably penetrates through the guide ring and then vertically extends downwards.

Preferably, the elastic part includes the spring, the spring is located in the slide, and its one end is connected with the slide roof, and the other end is connected with the movable block, the pull rod is worn to establish in the spring.

Preferably, the bottom of the movable block is provided with a stopping member, the stopping member comprises a shaft body vertically fixed at the bottom of the movable block and a limiting part, and the limiting part can move between an avoiding position and a stopping position relative to the shaft body; the bottom of the base body is provided with an avoidance hole communicated with the slide way; under the avoidance position, the limiting piece is closed to the shaft body so that the limiting piece can pass through the avoidance hole along with the shaft body; and under the stop position, the limiting part at least partially extends to the outside of the shaft body to form a stop.

Preferably, the shaft body comprises an upper shaft section and a lower shaft section which are axially connected, the upper shaft section is fixed with the movable block, the radius of the upper shaft section is larger than that of the lower shaft section, a step surface is formed between the upper shaft section and the lower shaft section, a cap is screwed on the lower shaft section through threads, and the outer diameter of the cap is smaller than that of the avoidance hole; an axially extending accommodating groove is formed in the peripheral side wall of the lower shaft section, and the upper end of the limiting piece is hinged in the accommodating groove; under the avoidance position, the limiting piece is turned into the accommodating groove, and the cap covers the limiting piece; and under the stop position, the limiting part is turned out of the accommodating groove, and the limiting part is abutted against the step surface through the cap cover.

Preferably, the detection piece comprises a sensing piece and a triggering piece for triggering the sensing piece, the triggering piece is arranged on the movable block, the sensing piece is arranged on the base, and when the triggering piece moves to a triggering position along with the movable block, the triggering piece triggers the sensing piece.

Preferably, the upright post provided with the first supporting arm is provided with a locker used for fixing the positioning section, the locker comprises a fixing block and at least one locking bolt, a channel for the positioning section to pass through is formed in the middle of the fixing block, the at least one locking bolt is in threaded connection with the fixing block, and the inner end of the at least one locking bolt abuts against the positioning section.

Preferably, a rope winding member for accommodating the winding positioning section is further provided on the column on which the first support arm is mounted.

Compared with the prior art, the invention has the advantages that:

when using this scheme to the guardrail of electron platform, when the user relies on the guardrail, it at first can rely on the section of keeping of stay cord, the section of keeping of stay cord can be to being close to crosspiece one side bending deformation after receiving passenger's dependence, thereby pull the section and just can atress pull the movable block, the elasticity that makes the movable block overcome the elastic component is advanced to the trigger position by initial position, in case the movable block gets into the trigger position, the detection piece just can be triggered, and then the player responds the detection piece and reports warning pronunciation, in order to remind the passenger not to rely on the guardrail.

In addition, the elastic piece is arranged in the scheme, so that when the body of a user stops depending on the elastic piece, the movable block can automatically reset under the elastic force of the elastic piece and enter the initial position again, and the holding section also returns to the initial state at the moment so as to send out safety warning again when a passenger depends on the elastic piece again.

Drawings

FIG. 1 is a schematic view of the present invention mounted to a guard rail;

fig. 2 is a partial structural diagram of the docking station;

FIG. 3 is an enlarged view of portion A of FIG. 1;

FIG. 4 is a vertical cross-sectional view of the present invention;

FIG. 5 is an enlarged view of portion B of FIG. 4;

FIG. 6 is an enlarged view of the shaft location of FIG. 5;

fig. 7 is a schematic structural view of the limiting member in the avoiding position state;

FIG. 8 is a schematic structural view of the position limiting member in the stopping position state;

FIG. 9 is a radial cross-sectional view of the base at the movable block position.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-9, the present embodiment provides a safety alarm device for an electronic platform, which is mainly used to be installed on a guardrail 1 of the electronic platform, as shown in fig. 2, the guardrail 1 is installed on one side of the platform near a highway for blocking pedestrians at the platform, as shown in fig. 1, and includes two upright posts 11 and a crosspiece 12 fixed between the two upright posts 11; it can be understood that the electronic station further comprises a control module and a display screen, and the information of bus arrival and the like is displayed on the display screen through the display screen; of course, a voice player can be further arranged on the electronic platform and used for playing voice, such as bus arrival reminding voice, safety warning voice and the like. There are many disclosures and applications of such electronic stations in the prior art, and therefore they will not be described in detail herein.

The safety alarm device provided by the invention comprises a support arm component, a pull rope 3, a linkage component 4 and an alarm unit, and the following parts are specifically explained:

as shown in fig. 1 and 4, the arm member includes a first arm 21 and a second arm 22 respectively mounted on the two uprights 11, and it should be noted that the first arm 21 and the second arm 22 both extend toward the side of the guardrail 1 away from the highway, and the first arm 21 and the second arm 22 are provided with through holes for the pull rope 3 to pass through.

As shown in fig. 1 and 4, one end of the pulling rope 3 is mounted on the first arm 21 to form a positioning section 31, the other end of the pulling rope movably bypasses the second arm 22 to form a pulling section 32, and the pulling rope 3 forms a holding section 33 arranged along the length direction of the crosspiece 12 between the first arm 21 and the second arm 22; retaining section 33 is located on the inside of rung 12, i.e., the side of rung 12 that is away from the roadway (as shown in FIG. 2).

The positioning section 31 at least includes a positioning point that is kept positioned relative to the upright post 11, that is, the positioning section 31 of the pull rope 3 is in a fixed state at the position of the positioning point and cannot be pulled, specifically:

as shown in fig. 4, in order to fix the positioning section 31, in this embodiment, a locker 7 for fixing the positioning section 31 is disposed on the upright post 11 on which the first support arm 21 is mounted, the locker 7 includes a fixing block 71 and at least one locking bolt 72, a channel 711 through which the positioning section 31 vertically passes is disposed in the middle of the fixing block 71, the at least one locking bolt 72 is screwed onto the fixing block 71, and an inner end of the at least one locking bolt abuts against the positioning section 31, when fixing, the positioning section 31 passes through the channel 711, and then the locking bolt 72 is screwed, so that the inner end of the locking bolt 72 presses the pull rope 3 against a sidewall of the channel 711, and thus a pressing point position between the inner end of the locking bolt 72 and the pull rope 3 is the aforementioned positioning point position, at which the pull rope 3 is fixed and cannot be pulled.

Of course, in other alternative embodiments, the end of the pull rope 3 can also be fixed directly to the first arm 21, in which case the fixing of the pull rope 3 can also be effected.

During actual installation, the pull rope 3 sequentially passes through the first support arm 21 and the second support arm 22, the lock 7 is used to fix the fixed point of the pull rope 3 (i.e. fix the positioning section 31) at the side of the first support arm 21, and the other end movably passes through the through hole of the second support arm 22 to form the traction section 32.

As shown in fig. 4 and 5, the linking member 4 is disposed on the upright 11 on which the second support arm 22 is mounted, and includes a base 41, a movable block 42 and an elastic member, the base 41 is fixed to the upright 11, the movable block 42 is movable between an initial position and a triggering position along the base 41, and the movable block 42 is connected to the traction section 32; in this embodiment, preferably, the movable block 42 performs a linear motion between the initial position and the triggering position along a vertical direction with respect to the base 41, specifically: as shown in fig. 5, a vertically extending slide way 411 is provided in the base 41, and the movable block 42 is slidably disposed in the slide way 411, so as to realize the linear motion of the movable block 42 in the vertical direction.

The connection mode of the movable block 42 and the traction section 32 can be as follows: the end of the traction section 32 is connected to the movable block 42 through a vertically disposed pull rod 44, wherein the pull rod 44 is movable in a vertical direction relative to the base 41, specifically, the pull rod 44 vertically penetrates through the base 41, one end of the pull rod is fixed to the movable block 42, and the other end of the pull rod movably penetrates through the top of the base 41 to be connected to the traction section 32.

In other alternative embodiments, the connection of the movable block 42 to the traction segment 32 may also be: the end of the traction section 32 vertically and movably penetrates into the slideway 411 through the top of the base body 41 and is fixed with the movable block 42.

Of course, in order to ensure that the pulling section 32 can be vertically connected with the pulling rod 44 downwards after being led out from the holding section 33, so as to ensure that the pulling direction of the pulling section 32 is approximately the same as the axial direction of the pulling rod 44, in this embodiment, as shown in fig. 3 and 4, a guide ring 221 is fixedly connected to the outer side of the second arm 22, and the pulling section 32 movably passes through the guide ring 221 and then vertically extends downwards, that is, the pulling rope 3 passes through the second arm 22 and then passes through the guide ring 221, and under the guidance of the guide ring 221, the pulling rope 3 vertically extends downwards right above the pulling rod 44.

In this embodiment, the elastic member is used for providing an elastic force to drive the movable block 42 to return, and a spring 43 may be used, as shown in fig. 5, the spring 43 is disposed in the slide way 411, one end of the spring 43 is connected to the top wall of the slide way 411, the other end of the spring is connected to the movable block 42, and the pull rod 44 is inserted into the spring 43, so that a downward pushing force is generated to the movable block 42 under the elastic force of the spring 43, and the movable block 42 is kept at the initial position under the action of the pushing force.

With the arrangement, when a person depends on the guardrail 1, the person firstly depends on the holding section 33 of the pull rope 3, so that the holding section 33 is bent and deformed towards one side close to the crosspiece 12, at the moment, because the positioning section 31 of the pull rope 3 is kept fixed, one end of the holding section 33, which is connected with the traction section 32, can pull the traction section 32 upwards, and then under the traction of the traction section 32, the movable block 42 can overcome the elastic force of the spring 43 to move upwards from the initial position until the triggering position is reached; once the person leaves the holding section 33, the movable block 42 is returned to the initial position by the elastic force of the spring 43, and the holding section 33 is also returned to the initial state.

The alarm unit comprises a detection piece 5 and a player (not shown in the figure), in the embodiment, the detection piece 5 and the player are both connected with a control unit (not shown in the figure), when the detection piece 5 is triggered, the control unit controls the player to start broadcasting alarm voice, such as broadcasting voice information of 'do not depend on the guardrail 1', and the like, in the embodiment, the control unit can be a control module of the electronic platform, or an external control unit, which is not specifically limited herein and can be selected according to actual needs; similarly, the player may be a voice player provided in the station itself, or may be a player additionally provided on the station, which is not limited herein.

The detection piece 5 is arranged on the linkage component 4, when the movable block 42 is at the trigger position, the detection piece 5 is triggered, and the player responds to the detection piece 5 and broadcasts warning voice.

The detecting member 5 may specifically be: as shown in fig. 5, the detecting member 5 includes a sensing member 51 and a triggering member 52 for triggering the sensing member 51, in this embodiment, the sensing member 51 may adopt a proximity switch, and the triggering member 52 may adopt a magnet, and the sensing member 51 is connected to the control unit; the triggering piece 52 is arranged on the movable block 42, the sensing piece 51 is arranged on the base, and when the triggering piece 52 moves to a triggering position along with the movable block 42, the triggering piece 52 triggers the sensing piece 51, so that the player starts to broadcast the warning voice.

The specific installation of the triggering element 52 and the sensing element 51 is as follows: as shown in fig. 5 and 9, a sliding groove 412 extending vertically is formed in a side wall of the sliding rail 411, a side wall of the movable block 42 extends laterally to form a sliding portion 421, the sliding portion 421 is slidably connected in the sliding groove 412, the sensing element 51 is mounted on a top wall of the sliding groove 412, the triggering element 52 is mounted on a top wall of the sliding portion 421, and when the triggering element 52 moves along with the sliding portion and the sensing element 51 contacts, that is, the movable block 42 moves to a triggering position, the sensing element 51 is triggered.

When the pull rope 3 is actually installed, it needs to be ensured that the holding section 33 of the pull rope 3 is kept in a tensioned state in an initial state, and that the vertical distance between the sensing piece 51 and the triggering piece 52 cannot be too small, if the vertical distance between the sensing piece 51 and the triggering piece 52 is too small, then the holding section 33 is slightly touched and deformed in subsequent use, and the triggering piece 52 can be easily pulled by the pulling section 32 to trigger the sensing piece 51; the triggering element 52 and the sensing element 51 are located in the base 41, and when the positioning segment 31 is fixed, it cannot be determined whether the distance between the triggering element 52 and the sensing element 51 is too small, and based on this, in order to effectively control the vertical distance between the sensing element 51 and the triggering element 52 when the rope 3 is actually pulled, the present embodiment is further improved:

as shown in fig. 5 and 6, a stopping member 6 is disposed at the bottom of the movable block 42, the stopping member 6 includes a shaft body 61 vertically fixed at the bottom of the movable block 42 and a limiting member 62, and the limiting member 62 is movable between an avoiding position and a stopping position relative to the shaft body 61; the bottom of the base 41 is provided with an avoiding hole 413 communicated with the slideway 411, wherein the limiting member 62 is rod-shaped

In the avoiding position, as shown in fig. 6 and 7, the limiting member 62 is closed to the shaft body 61 so that the limiting member 62 can pass through the avoiding hole 413 along with the shaft body 61; in other words, after the limiting member 62 is folded on the shaft body 61, the whole of the limiting member 62 and the shaft body 61 can freely pass through the avoiding hole 413.

In the stop position, as shown in fig. 8, the limiting element 62 at least partially extends to the outside of the shaft body 61 to form a blocking position, that is, the extending portion of the limiting element 62 forms a blocking function at the bottom of the avoiding hole 413, so that the limiting element 62 cannot pass through the avoiding hole 413.

Thus, during installation; when pulling the rope 3, the limiting member 62 can be kept at the stopping position, then the rope 3 vertically penetrates out of the channel 711 of the fixed block 71, then the rope 3 penetrating out of the channel 711 is tensioned downwards, the movable block 42 is pulled upwards along with the tensioning of the rope 3, finally the limiting member 62 abuts against the bottom of the base body 41, at this time, the movable block 42 cannot move upwards continuously, and thus the rope 3 cannot be pulled continuously, at this time, it is indicated that the movable block 42 and the trigger 52 reach the expected initial position, and at this time, the positioning section 31 of the rope 3 can be locked in the channel 711 by using the locking bolt 72; finally, the limiting member 62 is moved from the stopping position to the avoiding position, and the installation is completed, so that the subsequent normal use can be performed.

The specific structure for the stop member 6 is: as shown in fig. 6, the shaft body 61 includes an upper shaft segment 611 and a lower shaft segment 612 which are axially connected, the upper shaft segment 611 is fixed with the movable block 42 and has a radius larger than that of the lower shaft segment 612, so that a step surface 613 is formed at the joint of the upper shaft segment 611 and the lower shaft segment 612.

The cap 63 is screwed on the lower shaft section 612 in a threaded manner, specifically, an external thread is arranged on the outer peripheral wall of the lower shaft section 612, an internal thread is arranged on the inner peripheral wall of the cap 63, and the cap 63 is screwed on the lower shaft section 612 through the matching of the external thread and the internal thread.

In order to ensure that the cap 63 can normally pass through the avoiding hole 413 so that the movable block 42 can enter the triggering position from the initial position, in the embodiment, the outer diameter of the cap 63 is smaller than the radius of the avoiding hole 413.

As shown in fig. 6, an axially extending accommodating groove 6121 is formed in a peripheral sidewall of the lower shaft segment 612, an upper end of the limiting member 62 is hinged in the accommodating groove 6121, and the accommodating groove 6121 is configured such that, when the limiting member 62 is accommodated in the accommodating groove 6121, a sidewall of the limiting member 62 does not protrude from the peripheral wall of the lower shaft segment 612, so as to ensure that the cap 63 can be normally screwed on the lower shaft segment 612.

In the avoiding position, as shown in fig. 6, the limiting member 62 is turned into the accommodating groove 6121, and the cap 63 covers the limiting member 62; in the stop position, as shown in fig. 8, the stopper 62 is turned out of the receiving groove 6121, and the stopper 62 abuts against the step surface 613 through the cap 63.

Through the above arrangement, when the pull rope 3 is installed, the cap 63 can be screwed off first, the limiting member 62 is turned up, and then the cap 63 is screwed onto the lower shaft segment 612 again until the limiting member 62 is abutted against the step surface 613 by the front end of the cap 63, at this time, the limiting member 62 enters the stopping position, so that the distance between the trigger member 52 and the sensing member 51 is not too small when the pull rope 3 is installed; after the installation of the pull cord 3 is completed, the cap 63 is unscrewed again, the stopper 62 is turned over to the accommodating groove 6121, and then the cap 63 is screwed onto the lower shaft segment 612 again, so that the stopper 62 is accommodated inside the cap 63.

In the present embodiment, the cap 63 is disposed to cooperate with the position-limiting member 62, so as to: because the limiting member 62 needs to be fixed when being turned to the stopping position, otherwise, the effect of stopping and limiting cannot be achieved, the cap 63 is arranged to tightly abut against the limiting member 62, so that the limiting member 62 is kept at the stopping position; moreover, when the limiting member 62 is located at the avoiding position, the cap 63 can wrap the limiting member 62 through the cap 63, so that the limiting member 62 can be blocked by the cap 63 in the process that the limiting member 62 moves up and down along with the movable block 42, and the interference of the limiting member 62 in the normal up-and-down movement of the shaft body 61 caused by the turning-out of the limiting member 62 from the accommodating groove 6121 is prevented.

In order to store the redundant part of the pulling rope 3 from the positioning section 31, in the embodiment, as shown in fig. 1 and 4, the column 11 on which the first arm 21 is mounted is further provided with a rope winding member 8 for storing and winding the positioning section 31, which mainly comprises a box 81 and a winding reel 82 rotatably disposed in the box 81, the top of the box 81 is provided with an opening for the pulling rope 3 to penetrate, and the pulling rope 3 is led out from the bottom of the channel 711 and then wound on the winding reel 82 through the opening.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (10)

1. A safety alarm device of an electronic platform is used for being installed on a guardrail of the electronic platform, the guardrail comprises two upright posts and a crosspiece fixed between the two upright posts, and the safety alarm device is characterized by comprising a first upright post, a second upright post and a first alarm rod;

the support arm component comprises a first support arm and a second support arm which are respectively arranged on the two upright posts;

the pull rope is arranged between the first support arm and the second support arm to form a holding section arranged along the length direction of the crosspiece, and the positioning section at least comprises a positioning point for keeping positioning relative to the upright post;

the linkage component is arranged on the stand column provided with the second support arm and comprises a base body, a movable block and an elastic piece, the base body is fixed with the stand column, the movable block can move between an initial position and a triggering position along the base body, the movable block is connected with the traction section, when the maintaining section is deformed under stress, the traction section pulls the movable block to move from the initial position to the triggering position, and the elastic piece is used for providing elastic force to drive the movable block to reset;

and the alarm unit comprises a detection piece and a player for broadcasting alarm voice, wherein the detection piece is arranged on the linkage member, when the movable block is positioned at the trigger position, the detection piece is triggered, and the player responds to the detection piece to broadcast the alarm voice.

2. The security alarm device of an electronic platform according to claim 1, wherein the movable block is linearly movable in a vertical direction with respect to the base between an initial position and a triggered position.

3. A security alarm device for an electronic platform according to claim 2, wherein a vertically extending slide is provided in the base, and the movable block is slidably provided in the slide; the end of the traction section penetrates into the slideway through the vertical activity of the top of the base body and is fixed with the movable block, or the end of the traction section is connected with the movable block through a vertically arranged pull rod, wherein the pull rod can move along the vertical direction relative to the base body.

4. A security alarm device at an electronic platform according to claim 2 or 3, wherein a guide ring is fixedly connected to the outer side of the second arm, and the pulling section movably passes through the guide ring and then extends vertically and downwardly.

5. The security alarm device of an electronic platform according to claim 3, wherein the elastic member comprises a spring, the spring is disposed in the slide way, one end of the spring is connected to the top wall of the slide way, the other end of the spring is connected to the movable block, and the pull rod is inserted into the spring.

6. The security alarm device of an electronic platform according to claim 3, wherein the bottom of the movable block is provided with a stopping member, the stopping member comprises a shaft body vertically fixed at the bottom of the movable block and a limiting member, and the limiting member is movable between an avoiding position and a stopping position relative to the shaft body; the bottom of the base body is provided with an avoidance hole communicated with the slide way; under the avoidance position, the limiting piece is closed to the shaft body so that the limiting piece can pass through the avoidance hole along with the shaft body; and under the stop position, at least part of the limiting part extends to the outside of the shaft body to form blocking.

7. The safety warning device of an electronic platform according to claim 6, wherein the axle body comprises an upper axle segment and a lower axle segment which are axially connected, the upper axle segment is fixed with the movable block and has a radius larger than that of the lower axle segment, a step surface is formed between the upper axle segment and the lower axle segment, a cap is screwed on the lower axle segment, and the outer diameter of the cap is smaller than that of the avoidance hole; the peripheral side wall of the lower shaft section is provided with an axially extending accommodating groove, and the upper end of the limiting piece is hinged in the accommodating groove; under the avoidance position, the limiting piece is turned into the accommodating groove, and the cap covers the limiting piece; and under the stop position, the limiting part is turned out of the accommodating groove, and the limiting part is abutted against the step surface through the cap cover.

8. The security alarm device of an electronic platform of claim 1, wherein the detecting member comprises a sensing member and a triggering member for triggering the sensing member, the triggering member is disposed on the movable block, the sensing member is disposed on the base, and the triggering member triggers the sensing member when the triggering member travels with the movable block to a triggering position.

9. The security alarm device of an electronic platform according to claim 1, wherein the column on which the first arm is mounted is provided with a locker for fixing the positioning section, the locker comprises a fixing block and at least one locking bolt, the fixing block has a channel for the positioning section to pass through, the at least one locking bolt is screwed on the fixing block, and the inner end of the at least one locking bolt abuts against the positioning section.

10. The security alarm device of an electronic platform according to claim 1, wherein the pillar mounted with the first arm further comprises a rope winding member for receiving the winding positioning section.

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