阅读说明：本技术 一种水库用防汛预警装置 (Flood prevention early warning device for reservoir ) 是由 郑扬 虞以诺 于 2021-01-06 设计创作，主要内容包括：本发明涉及防汛预警领域,尤其是一种水库用防汛预警装置,包括固定管,所述固定管的两端外表面均设置有安装块,所述固定管的上端设置有基台,所述固定管的内部设置有驱动机构,所述驱动机构的一端设置有移动机构,所述基台的一端设置有触发机构；所述驱动机构包括开设在固定管的内壁的滑槽,所述固定管的内侧设置有浮块,所述浮块的前后两端外表面连接有限位块,所述限位块的上端滑槽的内侧设置有齿条,所述基台的上端连接有固定架,所述齿条与固定架之间连接有齿轮。该一种水库用防汛预警装置,可以使得防汛报警系统跟随着大坝水位的变化启动,整个装置全自动化,且不易受到风浪的影响,稳定性较高,比较灵敏。(The invention relates to the field of flood prevention early warning, in particular to a flood prevention early warning device for a reservoir, which comprises a fixed pipe, wherein installation blocks are arranged on the outer surfaces of two ends of the fixed pipe; the driving mechanism comprises a sliding groove formed in the inner wall of the fixed pipe, floating blocks are arranged on the inner side of the fixed pipe, limiting blocks are connected to the outer surfaces of the front end and the rear end of each floating block, racks are arranged on the inner sides of the sliding grooves in the upper ends of the limiting blocks, a fixing frame is connected to the upper end of the base station, and gears are connected between the racks and the fixing frame. This flood prevention early warning device for reservoir can be so that flood prevention alarm system follows the change start of dam water level, and whole device full automatization is just difficult for receiving the influence of stormy waves, and stability is higher, and is more sensitive.)

1. The utility model provides a flood prevention early warning device for reservoir, is including fixed pipe (1), its characterized in that: the outer surfaces of two ends of the fixed pipe (1) are respectively provided with an installation block (2), the upper end of the fixed pipe (1) is provided with a base platform (3), the inside of the fixed pipe (1) is provided with a driving mechanism (4), one end of the driving mechanism (4) is provided with a moving mechanism (5), and one end of the base platform (3) is provided with a trigger mechanism (6);

the driving mechanism (4) comprises a sliding groove (41) formed in the inner wall of the fixed pipe (1), a floating block (42) is arranged on the inner side of the fixed pipe (1), the outer surfaces of the front end and the rear end of the floating block (42) are connected with limiting blocks (43), a rack (44) is arranged on the inner side of the sliding groove (41) at the upper end of each limiting block (43), the upper end of the base platform (3) is connected with a fixed frame (45), and a gear (46) is connected between each rack (44) and the fixed frame (45);

the moving mechanism (5) comprises a limiting track (51) arranged inside the upper end of the mounting block (2), one end of the gear (46) is provided with a first screw rod (52), the outer side of the first screw rod (52) is provided with a moving ring (53), the lower end of the moving ring (53) is provided with a limiting rod (54), one end of the moving ring (53) is provided with a connecting rod (55), and one end of the connecting rod (55) is provided with a trigger block (56);

the trigger mechanism (6) comprises a protection box (61) arranged at one end of the installation block (2), a pressure sensor (62) is installed at one end of the protection box (61), a first fixing shaft (63) is arranged in the protection box (61), a second fixing shaft (64) is arranged in the protection box (61) and is close to the oblique upper side of the first fixing shaft (63), a rotating ring (65) is sleeved on the outer side of the first fixing shaft (63), a first rotating rod (66) is arranged at the rear end of the rotating ring (65), a first connecting head (67) is arranged at the upper end of the first rotating rod (66), a reset spring (68) is connected to the upper end of the first connecting head (67), a second connecting head (69) is connected between the reset spring (68) and the second fixing shaft (64), a second rotating rod (610) is arranged on the oblique upper side of the rotating ring (65), the one end of second bull stick (610) is provided with trigger lever (612), the inner wall fixed mounting of the one end protection box (61) of trigger lever (612) has alarm button (614), bayonet socket (611) have been seted up to the inside of second bull stick (610), the inside of protection box (61) is close to one side of second bull stick (610) and installs installing frame (615), the internally mounted of installing frame (615) has motor (616), second lead screw (617) are installed to the one end of motor (616), slide bar (618) are installed to the inside front side that is close to second lead screw (617) of protection box (61), slide bar (618) have been cup jointed fast (619) in the outside of slide bar (618) and second lead screw (617), the inside of the one end bayonet socket (611) of fast (619) is provided with cylinder piece (620).

2. The flood prevention early warning device for the reservoir according to claim 1, characterized in that: the quantity of spout (41) is two sets of, fixed connection between stopper (43) and kicking block (42), looks adaptation between stopper (43) and spout (41), stopper (43) sliding connection is in the inside of spout (41), fixed connection between the lower extreme of rack (44) and the upper end of stopper (43).

3. The flood prevention early warning device for the reservoir according to claim 1, characterized in that: the fixing frame (45) is fixedly arranged on the outer surface of the upper end of the base station (3), the gear (46) is connected with the fixing frame (45) through a rotating shaft, and the gear (46) is meshed with the rack (44) and connected with the rack.

4. The flood prevention early warning device for the reservoir according to claim 1, characterized in that: one end of the first screw rod (52) is fixedly connected with the gear (46), the moving ring (53) is in threaded connection with the first screw rod (52), the upper end of the limiting rod (54) is fixedly connected with the moving ring (53), and the limiting rod (54) is in sliding connection with the limiting track (51).

5. The flood prevention early warning device for the reservoir according to claim 1, characterized in that: the quantity of connecting rod (55) is three groups, three groups fixed connection between connecting rod (55) and shift ring (53), three groups fixed connection between connecting rod (55) and trigger piece (56).

6. The flood prevention early warning device for the reservoir according to claim 1, characterized in that: protection box (61) fixed welding is in the one end of base station (3), pressure sensor (62) fixed mounting is in the one end of protection box (61), first fixed axle (63) fixed mounting is in the inside of protection box (61), second fixed axle (64) fixed mounting is in the inside of protection box (61), it is connected to rotate between swivel becket (65) and first fixed axle (63), fixed connection between the rear end of first bull stick (66) and swivel becket (65), rotate between first adapter (67) and first bull stick (66) and be connected, fixed connection between reset spring (68) and first adapter (67), fixed connection between second adapter (69) and reset spring (68), rotate between second adapter (69) and the second fixed axle (64) and be connected.

7. The flood prevention early warning device for the reservoir according to claim 1, characterized in that: the lower extreme and the swivel becket (65) of second bull stick (610) between fixed connection, the one end of trigger lever (612) and the one end fixed connection of second bull stick (610), the shape of bayonet socket (611) is semicircle form, alarm button (614) fixed mounting is at the inner wall of one side protection box (61) of trigger lever (612), alarm button (614) and trigger lever (612) are located same height.

8. The flood prevention early warning device for the reservoir according to claim 1, characterized in that: the mounting frame (615) is fixedly mounted on one side, close to the second rotating rod (610), of the interior of the protection box (61), the motor (616) is fixedly mounted in the mounting frame (615), one end of the second screw rod (617) is fixedly connected with an inner rotor of the motor (616), the sliding rod (618) is fixedly mounted on one side, close to the second screw rod (617), of the interior of the protection box (61), the sliding block (619) is in threaded connection with the second screw rod (617), the sliding block (619) is in sliding connection with the sliding rod (618), the cylindrical block (620) is fixedly connected with the sliding block (619), and the cylindrical block (620) is movably embedded in the trigger rod (612).

Technical Field

The invention relates to the technical field of flood prevention early warning, in particular to a flood prevention early warning device for a reservoir.

Background

Reservoirs, generally interpreted as "water conservancy structures that store and hold floods and regulate water flow, can be utilized for irrigation, power generation, flood control and fish farming. "it refers to an artificial lake formed by building a barrage at the throat of a mountain ditch or river. After the reservoir is built, the functions of flood control, water storage irrigation, water supply, power generation, fish culture and the like can be realized. Sometimes natural lakes are also called reservoirs (natural reservoirs). The scale of the reservoir is generally divided into small, medium and large sizes according to the size of the reservoir capacity, and in some southern areas, if continuous rainstorm occurs, the reservoir can have the situation of sudden increase of water level, and needs to be prevented.

The conventional flood prevention early warning device for the reservoir has the defects that the flood prevention early warning device is greatly influenced by water surface spray, and when wind power is high, the flood prevention warning device can be triggered even if the water surface does not reach the warning water level, so that the flood prevention early warning device is not stable enough and has a narrow application range.

Disclosure of Invention

The invention aims to solve the defects in the prior art, and provides a flood prevention early warning device for a reservoir.

In order to achieve the above purposes, the technical scheme adopted by the invention is as follows: a flood prevention early warning device for a reservoir comprises a fixed pipe, wherein installation blocks are arranged on the outer surfaces of two ends of the fixed pipe, a base station is arranged at the upper end of the fixed pipe, a driving mechanism is arranged inside the fixed pipe, a moving mechanism is arranged at one end of the driving mechanism, and a triggering mechanism is arranged at one end of the base station;

the driving mechanism comprises a sliding groove formed in the inner wall of the fixed pipe, a floating block is arranged on the inner side of the fixed pipe, the outer surfaces of the front end and the rear end of the floating block are connected with limiting blocks, a rack is arranged on the inner side of the sliding groove at the upper end of each limiting block, a fixing frame is connected to the upper end of the base station, and a gear is connected between the rack and the fixing frame;

the moving mechanism comprises a limiting track arranged inside the upper end of the mounting block, a first lead screw is arranged at one end of the gear, a moving ring is arranged on the outer side of the first lead screw, a limiting rod is arranged at the lower end of the moving ring, a connecting rod is arranged at one end of the moving ring, and a trigger block is arranged at one end of the connecting rod;

the trigger mechanism comprises a protection box arranged at one end of an installation block, a pressure sensor is installed at one end of the protection box, a first fixed shaft is arranged in the protection box, a second fixed shaft is arranged in the protection box and close to the oblique upper part of the first fixed shaft, a rotating ring is sleeved on the outer side of the first fixed shaft, a first rotating rod is arranged at the rear end of the rotating ring, a first connecting head is arranged at the upper end of the first rotating rod, a reset spring is connected to the upper end of the first connecting head, a second connecting head is connected between the reset spring and the second fixed shaft, a second rotating rod is arranged above the rotating ring in an oblique manner, a trigger rod is arranged at one end of the second rotating rod, an alarm button is fixedly installed on the inner wall of the protection box at one end of the trigger rod, a bayonet is arranged in the second rotating rod, an installation frame is installed at one side of the protection box close to the second rotating rod, the mounting frame is internally provided with a motor, a second lead screw is installed at one end of the motor, a slide bar is installed at the front side, close to the second lead screw, of the inside of the protection box, the slide bar is sleeved with the outer side of the second lead screw, and a cylindrical block is arranged inside a bayonet at one end of the slide bar.

Preferably, the quantity of spout is two sets of, fixed connection between stopper and the kicking block, looks adaptation between stopper and the spout, stopper sliding connection is in the inside of spout, fixed connection between the lower extreme of rack and the upper end of stopper.

Preferably, the fixing frame is fixedly installed on the outer surface of the upper end of the base station, the gear is connected with the fixing frame through a rotating shaft, and the gear and the rack are meshed and connected with each other.

Preferably, one end of the first screw rod is fixedly connected with the gear, the moving ring is in threaded connection with the first screw rod, the upper end of the limiting rod is fixedly connected with the moving ring, and the limiting rod is in sliding connection with the limiting track.

Preferably, the quantity of connecting rod is three groups, three groups fixed connection between connecting rod and the shifting ring, three groups fixed connection between connecting rod and the trigger block.

Preferably, the protection box is fixedly welded at one end of the base station, the pressure sensor is fixedly installed at one end of the protection box, the first fixing shaft is fixedly installed in the protection box, the second fixing shaft is fixedly installed in the protection box, the rotating ring is rotatably connected with the first fixing shaft, the rear end of the first rotating rod is fixedly connected with the rotating ring, the first connecting head is rotatably connected with the first rotating rod, the reset spring is fixedly connected with the first connecting head, the second connecting head is fixedly connected with the reset spring, and the second connecting head is rotatably connected with the second fixing shaft.

Preferably, fixed connection between the lower extreme of second bull stick and the swivel, the one end of trigger lever and the one end fixed connection of second bull stick, the shape of bayonet socket is semicircle form, alarm button fixed mounting is at the inner wall of one side protection box of trigger lever, alarm button and trigger lever are located same height.

Preferably, the mounting frame fixed mounting is in the inside of protection box near one side of second bull stick, motor fixed mounting is in the inside of mounting frame, fixed connection between the one end of second lead screw and the inside rotor of motor, slide bar fixed mounting is in the inside of protection box near one side department of second lead screw, threaded connection between smooth fast and the second lead screw, sliding connection between smooth fast and the slide bar, fixed connection between cylinder piece and the smooth fast, cylinder piece activity is inlayed in the inside of trigger lever.

Compared with the prior art, the invention has the following beneficial effects:

1. when the water level of dam rises, the floating block can move up under the buoyancy effect of water, the floating block moves up and can drive the stopper to slide and move up in the inboard of spout, the stopper moves up and can drive the rack to move up, because be the intermeshing relation between rack and the gear, so the in-process that the rack moved up can drive the gear and rotate in the inboard of mount, can convert the rise of dam water level into the rotation number of turns of gear, through setting up the stopper in the inside of fixed pipe, can avoid the stopper to receive the influence of stormy waves, and is more practical.

2. Can drive first lead screw when gear revolve and rotate, because be threaded connection relation between shift ring and the first lead screw, and the gag lever post of shift ring lower extreme is restricted in spacing orbital inside, so can make the shift ring remove in order to remove in the outside of first lead screw when first lead screw pivoted, thereby reach the purpose that drives the connecting rod and remove, can make trigger block remove through the connecting rod removal, can make trigger block trigger pressure sensor through trigger block removal, can convert the rotation of trigger block into pressure, it is more practical.

3. When the pressure sensor senses the pressure from the trigger block, the motor can be started to drive the second screw rod to rotate, due to the fact that the second screw rod and the sliding block are in threaded connection, the sliding block can move outside the second screw rod and the sliding rod when the second screw rod rotates, the cylindrical block at one end of the sliding block can be driven to move through the sliding block, when the cylindrical block moves out of the bayonet, the second rotating rod can lose the supporting force of the cylindrical block, the stretched reset spring restores to the original state under the action of the elastic force of the second rotating rod, the reset spring resets to drive the first connecting head to move upwards, the first connecting head moves upwards to enable the first rotating rod to rotate with the rotating ring as a fulcrum, meanwhile, the second rotating rod can also rotate with the rotating ring, the purpose of enabling the trigger rod to move to trigger the alarm button is achieved, and the anti-flood alarm system can be started through the triggering of the alarm button, the flood prevention alarm system can be started along with the change of the water level of the dam by matching the moving mechanism and the triggering mechanism, the whole device is fully automatic, is not easily influenced by wind waves, and is high in stability and sensitive.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the overall cutaway structure of the present invention;

FIG. 3 is an enlarged view of the portion B of the present invention;

FIG. 4 is a schematic structural diagram of the moving mechanism of the present invention;

FIG. 5 is an enlarged view of part A of the present invention;

FIG. 6 is a schematic structural view of the trigger mechanism of the present invention;

FIG. 7 is a schematic structural view of the trigger mechanism of the present invention;

FIG. 8 is an enlarged view of the part C according to the present invention.

In the figure: 1. a fixed tube; 2. mounting blocks; 3. a base station; 4. a drive mechanism; 41. a chute; 42. floating blocks; 43. a limiting block; 44. a rack; 45. a fixed mount; 46. a gear; 5. a moving mechanism; 51. a limiting track; 52. a first lead screw; 53. a moving ring; 54. a limiting rod; 55. a connecting rod; 56. a trigger block; 6. a trigger mechanism; 61. a protective case; 62. a pressure sensor; 63. a first fixed shaft; 64. a second fixed shaft; 65. a rotating ring; 66. a first rotating lever; 67. a first connector; 68. a return spring; 69. a second connector; 610. a second rotating rod; 611. a bayonet; 612. a trigger lever; 614. an alarm button; 615. installing a frame; 616. a motor; 617. a second lead screw; 618. a slide bar; 619. the smoothness is fast; 620. a cylindrical block.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.

Referring to fig. 1-8, a flood prevention early warning device for a reservoir includes a fixed pipe 1, mounting blocks 2 are disposed on outer surfaces of two ends of the fixed pipe 1, a base station 3 is disposed at an upper end of the fixed pipe 1, a driving mechanism 4 is disposed inside the fixed pipe 1, a moving mechanism 5 is disposed at one end of the driving mechanism 4, and a trigger mechanism 6 is disposed at one end of the base station 3;

the driving mechanism 4 comprises a sliding groove 41 arranged on the inner wall of the fixed pipe 1, a floating block 42 is arranged on the inner side of the fixed pipe 1, the outer surfaces of the front end and the rear end of the floating block 42 are connected with limiting blocks 43, a rack 44 is arranged on the inner side of the sliding groove 41 at the upper end of each limiting block 43, the upper end of the base station 3 is connected with a fixed frame 45, and a gear 46 is connected between each rack 44 and the fixed frame 45;

the moving mechanism 5 comprises a limiting track 51 arranged inside the upper end of the mounting block 2, one end of the gear 46 is provided with a first screw rod 52, the outer side of the first screw rod 52 is provided with a moving ring 53, the lower end of the moving ring 53 is provided with a limiting rod 54, one end of the moving ring 53 is provided with a connecting rod 55, and one end of the connecting rod 55 is provided with a trigger block 56;

the trigger mechanism 6 comprises a protection box 61 arranged at one end of the mounting block 2, one end of the protection box 61 is provided with a pressure sensor 62, a first fixed shaft 63 is arranged in the protection box 61, a second fixed shaft 64 is arranged in the protection box 61 and close to the oblique upper part of the first fixed shaft 63, a rotating ring 65 is sleeved on the outer side of the first fixed shaft 63, a first rotating rod 66 is arranged at the rear end of the rotating ring 65, a first connecting head 67 is arranged at the upper end of the first rotating rod 66, a return spring 68 is connected at the upper end of the first connecting head 67, a second connecting head 69 is connected between the return spring 68 and the second fixed shaft 64, a second rotating rod 610 is arranged at the oblique upper part of the rotating ring 65, one end of the second rotating rod 610 is provided with a trigger rod 612, an alarm button 614 is fixedly arranged on the inner wall of the protection box 61 at one end of the trigger rod 612, a bayonet 611 is arranged in the second rotating rod 610, a mounting frame 615 is arranged at one, the motor 616 is installed inside the installation frame 615, the second lead screw 617 is installed at one end of the motor 616, the slide bar 618 is installed at the front side, close to the second lead screw 617, inside the protection box 61, the slide bar 618 and the second lead screw 617 are sleeved with the slide block 619, and the cylindrical block 620 is arranged inside the bayonet 611 at one end of the slide block 619.

The quantity of spout 41 is two sets ofly, fixed connection between stopper 43 and the kicking block 42, looks adaptation between stopper 43 and the spout 41, stopper 43 sliding connection is in the inside of spout 41, fixed connection between the lower extreme of rack 44 and the upper end of stopper 43, and mount 45 fixed mounting is in the upper end surface of base station 3, and the pivot is connected between gear 46 and the mount 45, and intermeshing is connected between gear 46 and the rack 44.

Thereby at first use the inside of bolt through installation piece 2 to reach and install device fixed mounting in the assigned position, when the water level of dam rises, floating block 42 can move up under the buoyancy effect of water, floating block 42 moves up and can drive stopper 43 and slide in the inboard of spout 41 and move up, stopper 43 moves up and can drive rack 44 and move up, because be intermeshing relation between rack 44 and gear 46, so rack 44 moves up the in-process can drive gear 46 and rotate at the inboard of mount 45, can convert the rise height of dam water level into the number of turns of gear 46, through setting up stopper 43 in the inside of fixed pipe 1, can avoid stopper 43 to receive the influence of stormy waves, and is practical.

One end of the first screw 52 is fixedly connected with the gear 46, the moving ring 53 is in threaded connection with the first screw 52, the upper end of the limiting rod 54 is fixedly connected with the moving ring 53, the limiting rod 54 is in sliding connection with the limiting track 51, the number of the connecting rods 55 is three, the three connecting rods 55 are fixedly connected with the moving ring 53, and the three connecting rods 55 are fixedly connected with the trigger block 56.

When the gear 46 rotates, the first screw 52 can be driven to rotate, due to the fact that the moving ring 53 and the first screw 52 are in threaded connection, and the limiting rod 54 at the lower end of the moving ring 53 is limited inside the limiting track 51, the moving ring 53 can move outside the first screw 52 when the first screw 52 rotates, the purpose of driving the connecting rod 55 to move is achieved, the trigger block 56 can move through the movement of the connecting rod 55, and the trigger block 56 can trigger the pressure sensor 62 through the movement of the trigger block 56.

The protection box 61 is fixedly welded at one end of the base station 3, the pressure sensor 62 is fixedly arranged at one end of the protection box 61, the first fixing shaft 63 is fixedly arranged in the protection box 61, the second fixing shaft 64 is fixedly arranged in the protection box 61, the rotating ring 65 is rotatably connected with the first fixing shaft 63, the rear end of the first rotating rod 66 is fixedly connected with the rotating ring 65, the first connector 67 is rotatably connected with the first rotating rod 66, the reset spring 68 is fixedly connected with the first connector 67, the second connector 69 is fixedly connected with the reset spring 68, the second connector 69 is rotatably connected with the second fixing shaft 64, the lower end of the second rotating rod 610 is fixedly connected with the rotating ring 65, one end of the trigger rod 612 is fixedly connected with one end of the second rotating rod 610, the bayonet 611 is semicircular, the alarm button 614 is fixedly arranged on the inner wall of the protection box 61 at one side of the trigger rod 612, the alarm button 614 and the trigger rod 612 are located at the same height, the mounting frame 615 is fixedly mounted inside the protection box 61 and close to one side of the second rotating rod 610, the motor 616 is fixedly mounted inside the mounting frame 615, one end of the second lead screw 617 is fixedly connected with an inner rotor of the motor 616, the sliding rod 618 is fixedly mounted inside the protection box 61 and close to one side of the second lead screw 617, the slider 619 is in threaded connection with the second lead screw 617, the slider 619 is in sliding connection with the sliding rod 618, the cylindrical block 620 is fixedly connected with the slider 619, and the cylindrical block 620 is movably embedded inside the trigger rod 612.

The trigger block 56 can trigger the pressure sensor 62 by moving the trigger block 56, the motor 616 can be started when the pressure sensor 62 senses the pressure from the trigger block 56, the motor 616 is started to drive the second lead screw 617 to rotate, due to the threaded connection relationship between the second lead screw 617 and the sliding block 619, the sliding block 619 can be moved outside the second lead screw 617 and the sliding rod 618 when the second lead screw 617 rotates, the cylindrical block 620 at one end of the sliding block 619 can be driven to move by the movement of the sliding block 619, the second rotating rod 610 can lose the supporting force of the cylindrical block 620 when the cylindrical block 620 moves out of the bayonet 611, at this time, the stretched return spring 68 is restored under the action of the elastic force of the return spring 68, the return spring 68 resets to drive the first connecting head 67 to move upwards, the first connecting head 67 moves upwards to enable the first rotating rod 66 to rotate by taking the rotating ring 65 as a fulcrum, meanwhile, the second rotating rod 610 can also rotate through the rotating ring 65, so that the purpose that the triggering rod 612 moves to trigger the alarm button 614 is achieved, the flood prevention alarm system can be started through triggering of the alarm button 614, the flood prevention alarm system can be started along with the change of the water level of the dam through the matching between the moving mechanism 5 and the triggering mechanism 6, the whole device is fully automatic, is not easily influenced by wind waves, and is high in stability and sensitive.

The working principle of the invention is as follows:

referring to the attached drawings 1-8 of the specification, firstly, the device is fixedly installed at a designated position by penetrating through the inside of the installation block 2 with bolts, when the water level of the dam rises, the floating block 42 moves upwards under the buoyancy of water, the floating block 42 moves upwards to drive the limit block 43 to slide upwards on the inner side of the chute 41, the limit block 43 moves upwards to drive the rack 44 to move upwards, because the rack 44 and the gear 46 are meshed with each other, the gear 46 is driven to rotate on the inner side of the fixed frame 45 in the process of moving upwards the rack 44, the rising height of the water level of the dam can be converted into the number of rotation turns of the gear 46, the limit block 43 is arranged inside the fixed pipe 1, the limit block 43 can be prevented from being affected by wind waves, the device is practical, when the gear 46 rotates, the first screw 52 can be driven to rotate, because the movable ring 53 and the first screw 52 are in threaded connection, and the limit rod 54 at the lower end of the moving ring 53 is limited in the limit track 51, so that the moving ring 53 can move outside the first lead screw 52 when the first lead screw 52 rotates, thereby achieving the purpose of driving the connecting rod 55 to move, the trigger block 56 can move through the movement of the connecting rod 55, the trigger block 56 can trigger the pressure sensor 62 through the movement of the trigger block 56, the motor 616 can be started when the pressure sensor 62 senses the pressure from the trigger block 56, the motor 616 can be started to drive the second lead screw 617 to rotate, because the second lead screw 617 and the sliding block 619 are in a threaded connection relationship, the sliding block 619 can move outside the second lead screw 617 and the sliding rod 618 when the second lead screw 617 rotates, the cylindrical block 620 at one end of the sliding block 619 can be driven to move through the movement of the sliding block 619, and when the cylindrical block 620 moves out of the bayonet 611, the second rotating rod 610 can lose the supporting force of the cylindrical block 620, at the moment, the stretched return spring 68 is restored under the action of the elastic force of the return spring 68, the return spring 68 resets to drive the first connecting head 67 to move upwards, the first connecting head 67 moves upwards to enable the first rotating rod 66 to rotate by taking the rotating ring 65 as a fulcrum, and meanwhile, the second rotating rod 610 also rotates by taking the rotating ring 65 as a fulcrum, so that the purpose of enabling the trigger rod 612 to move to trigger the alarm button 614 is achieved, the flood prevention alarm system can be started by triggering the alarm button 614, the flood prevention alarm system can be started along with the change of the water level of the dam by matching between the moving mechanism 5 and the trigger mechanism 6, the whole device is fully automatic, is not easily influenced by wind waves, and is high in stability and sensitive.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.