CN219033087U - Anti-backflow device - Google Patents

Abstract

The application discloses prevent flowing backward device belongs to flood control equipment field, has solved present flood control device and has not only flood control inefficiency, also can not effectively block ponding diffuse into the problem. And fixing columns are respectively arranged on the retaining walls at two sides of the garage inlet and extend along the height direction of the retaining walls. A telescopic rod is arranged in each fixed column respectively, and water retaining cloth is arranged between the two telescopic rods. A water retaining cloth storage groove is formed in the ground between the two fixed columns, and extends along the width direction of the garage inlet. And the top of each fixed column is provided with a lifting mechanism respectively. A lifting rod is connected between the two lifting mechanisms, the lifting rod is connected with one end of the water retaining cloth, and the other end of the water retaining cloth is fixed at the bottom of the water retaining cloth storage tank. The lifting mechanism can drive the lifting rod to move up and down so as to expand or retract the water retaining cloth. The flood control device is high in flood control efficiency and can effectively prevent ponding from overflowing.

Description

Anti-backflow device

Technical Field

The application relates to the technical field of flood control equipment, in particular to a backflow preventing device.

Background

When extreme rainfall weather such as heavy rain occurs, the short time strong rainfall can lead to urban drainage system paralysis, and unnecessary rainwater can't pass through municipal pipe network and discharge to cause the road surface ponding. At this time, underground facilities such as underground garages, subways, underground shops and the like face the risk of rainwater backflow, and great losses are caused.

At present, when heavy rain occurs, a sand bag or a baffle Hong Ban is manually conveyed to an inlet of an underground facility so as to avoid rainwater from entering, however, the flood control method is low in efficiency and can not timely and effectively prevent ponding from overflowing.

Disclosure of Invention

The embodiment of the application solves the problems that the existing flood control device is low in flood control efficiency and can not effectively block ponding from overflowing.

The embodiment of the utility model provides a backflow preventing device, which comprises a fixed column, a lifting mechanism, a lifting rod, a telescopic rod, water retaining cloth and a water retaining cloth storage tank; the retaining walls on two sides of the garage inlet are respectively provided with a fixing column, and the fixing columns extend along the height direction of the retaining walls; each fixing column is internally provided with one telescopic rod, and water retaining cloth is arranged between the two telescopic rods; the water retaining cloth storage grooves are formed in the ground between the two fixed columns and extend along the width direction of the garage inlet; the top of each fixed column is provided with one lifting mechanism respectively; the lifting rods are connected between the two lifting mechanisms, the lifting rods are connected with one end of the water retaining cloth, and the other end of the water retaining cloth is fixed at the bottom of the water retaining cloth storage groove; the lifting mechanism can drive the lifting rod to move up and down so as to expand or retract the water retaining cloth.

In one possible implementation, the lifting mechanism comprises a motor, a spool, a flexible cord, and a closable hook; the motor is fixed on the fixed column, and the output end of the motor is connected with the winding drum; one end of the flexible cable is fixed with the winding drum, the other end of the flexible cable is connected with the closable hook, the other end of the closable hook is connected with the lifting rod, so that when the motor drives the winding drum to rotate, the winding drum can retract the flexible cable, and then the flexible cable can drive the lifting rod to move up and down along the height direction of the fixed column.

In one possible implementation manner, two hanging rings are arranged at the top of the lifting rod, the two hanging rings are respectively positioned at two ends of the lifting rod, and the two hanging rings are respectively connected with the closable hooks at corresponding positions.

In one possible implementation, the backflow prevention device further comprises a water level sensor, a sump, and a controller; the water collecting pit is arranged at one end, away from the retaining wall, of the fixed column, and the water level sensor is arranged in the water collecting pit; the water level sensor is electrically connected with the controller, and the controller is electrically connected with the motor.

In one possible implementation, the backflow prevention device further comprises a drainage mechanism; the drainage mechanism comprises a drainage pipe and a check valve; the water inlet end of the drain pipe is arranged at the bottom of the water collecting pit, and the water outlet end of the drain pipe is communicated with the municipal pipeline; the check valve is disposed on the drain pipe.

In one possible implementation, the backflow prevention device further comprises a water blocking wing; each fixing column is provided with a water blocking wing, the water blocking wings extend along the height direction of the fixing column, and the water blocking wings are located on one side, away from the garage inlet, of the water blocking cloth.

In one possible implementation, the backflow prevention device further comprises a support mechanism; the supporting mechanism comprises a plurality of pole barrels, anti-falling pieces and supporting poles; the plurality of rod cylinders are fixed at the bottom of the water retaining cloth storage groove at intervals along the width direction of the garage inlet, extend along the height direction of the water retaining cloth, and are positioned at one side of the water retaining cloth, which is far away from the garage inlet; one end of the supporting rod can slide in the rod cylinder, and the other end of the supporting rod is connected to the top end of the water retaining cloth; the anti-falling piece is arranged between the support rod and the rod barrel.

In one possible implementation, a plurality of drain holes are provided in the bottom of the stem.

In one possible implementation, the highest point of the pole cylinder is higher than the bottom of the water cloth storage tank.

In one possible implementation, the anti-falling member includes a latch and a latch groove; the clamping block is fixed at the top of the rod barrel and is positioned in the inner cavity of the rod barrel; the clamping groove is formed in the bottom of the supporting rod and is positioned on the outer side wall of the supporting rod; the clamping block can be clamped in the clamping groove, so that the supporting rod is prevented from falling out of the rod barrel.

One or more technical solutions provided in the embodiments of the present utility model at least have the following technical effects or advantages:

the embodiment of the utility model provides a backflow preventing device which comprises a fixed column, a lifting mechanism, a lifting rod, a telescopic rod, water retaining cloth and a water retaining cloth storage tank. And fixing columns are respectively arranged on the retaining walls at two sides of the garage inlet and extend along the height direction of the retaining walls. A telescopic rod is arranged in each fixed column respectively, and water retaining cloth is arranged between the two telescopic rods. A water retaining cloth storage groove is formed in the ground between the two fixed columns, and extends along the width direction of the garage inlet. And the top of each fixed column is provided with a lifting mechanism respectively. A lifting rod is connected between the two lifting mechanisms, the lifting rod is connected with one end of the water retaining cloth, and the other end of the water retaining cloth is fixed at the bottom of the water retaining cloth storage tank. The lifting mechanism can drive the lifting rod to move up and down so as to expand or retract the water retaining cloth. In practical application, when no flood occurs, the water retaining cloth is stored in the water retaining cloth storage tank, so that normal traffic of vehicles is not affected; when the flood occurs, the lifting mechanism drives the lifting rod to rise, and the lifting rod rises to drive the water retaining cloth to be unfolded, so that the water retaining cloth can be unfolded rapidly to block rainwater which is diffused into the garage, the flood control efficiency is high, and accumulated water can be effectively prevented from being diffused into the garage.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments of the present utility model will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a backflow preventing device according to an embodiment of the present disclosure;

fig. 2 is a schematic view of an unfolding structure of a water retaining cloth of a backflow preventing device according to an embodiment of the present application;

FIG. 3 is an enlarged view at A in FIG. 2;

FIG. 4 is a top view at B in FIG. 2;

fig. 5 is a schematic structural diagram of a supporting mechanism according to an embodiment of the present application;

fig. 6 is a schematic view of a water-retaining cloth storage structure of the anti-backflow device according to the embodiment of the present application;

fig. 7 is a schematic structural diagram of a backflow preventing device according to an embodiment of the present disclosure;

FIG. 8 is a schematic view of a connection between a lifting mechanism and a lifting rod according to an embodiment of the present disclosure;

fig. 9 is an enlarged view at C in fig. 8;

fig. 10 is a schematic structural diagram of connection between a water blocking cloth and a lifting rod according to an embodiment of the present disclosure;

fig. 11 is an enlarged view of D in fig. 10;

fig. 12 is a schematic structural diagram III of an anti-backflow device according to an embodiment of the present application;

fig. 13 is a schematic structural diagram of a backflow preventing device according to an embodiment of the present disclosure.

Icon: 1-fixing columns; 2-a lifting mechanism; 21-an electric motor; 22-winding drum; 23-flexible cable; 24-a closable hook; 3-lifting bar; 3 a-hanging ring; 4-a telescopic rod; 5-water retaining cloth; 6-a water retaining cloth storage tank; 7-a water level sensor; 8-a water collecting pit; 9-retaining wall; 10-hydrofoils; 11-a supporting mechanism; 111-a pole barrel; 111 a-draining holes; 112-anti-falling pieces; 112 a-a clip; 112 b-a clamping groove; 113-supporting rods; 12-a drainage mechanism; 121-a drain pipe; 122-check valve; 13-cover plate.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the embodiments of the present utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the embodiments of the present utility model and simplify description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. The terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the embodiments of the present utility model will be understood by those of ordinary skill in the art according to specific circumstances.

As shown in fig. 1 to 13, an embodiment of the present utility model provides a backflow preventing device including a fixed column 1, a lifting mechanism 2, a lifting rod 3, a telescopic rod 4, a water cloth 5 and a water cloth storage tank 6. In practical application, the material of the water retaining cloth 5 is PVC knife scraping cloth, the lifting height is 1.1 m, and the water retaining height is 1 m.

With continued reference to fig. 1, a retaining wall 9 on both sides of the garage entrance is provided with a fixing column 1, and the fixing column 1 extends along the height direction of the retaining wall 9. In practical application, the height of the fixing column 1 is set according to practical requirements.

With continued reference to fig. 2, a telescopic rod 4 is respectively disposed in each fixed column 1, and a water blocking cloth 5 is disposed between the two telescopic rods 4. Specifically, a water blocking cloth 5 is disposed between the two telescopic rods 4, the water blocking cloth 5 is unfolded along with the rising of the lifting rod 3, and the telescopic rods 4 are also stretched along with the water blocking cloth 5 when the water blocking cloth 5 is unfolded so as to support the left end and the right end of the water blocking cloth 5.

With continued reference to fig. 10, a water cloth storage tank 6 is provided on the ground between the two fixing posts 1, the water cloth storage tank 6 extending in the width direction of the garage entrance. In practical application, when the water retaining cloth 5 is not used, the water retaining cloth storage tank 6 can store the water retaining cloth 5 so as to prevent the water retaining cloth 5 from being exposed outside to influence the traffic of vehicles.

With continued reference to fig. 8, a lifting mechanism 2 is provided at the top of each fixed column 1. A lifting rod 3 is connected between the two lifting mechanisms 2, the lifting rod 3 is connected with one end of a water retaining cloth 5, and the other end of the water retaining cloth 5 is fixed at the bottom of a water retaining cloth storage groove 6. The lifting mechanism 2 can drive the lifting rod 3 to move up and down so as to expand or retract the water retaining cloth 5. In practical application, when no flood occurs, the water retaining cloth 5 is stored in the water retaining cloth storage tank 6, so that normal traffic of vehicles is not affected; when the flood occurs, the lifting mechanism 2 drives the lifting rod 3 to rise, and the lifting rod 3 rises to drive the water retaining cloth 5 to be unfolded, so that the water retaining cloth 5 can be unfolded rapidly to block rainwater which is diffused into a garage, the flood control efficiency is high, and accumulated water can be effectively prevented from being diffused into the garage.

With continued reference to fig. 7, a cover plate 13 is provided on top of the lifting bar 3, the size of the cover plate 13 being matched to the size of the water cloth storage tank 6. In practical application, set up apron 13 can seal the top of manger plate cloth spread groove 6 to make manger plate cloth spread groove 6 be in the confined state when manger plate cloth 5 is not used, not only do not influence the traffic of vehicle, also can avoid debris to get into manger plate cloth spread groove 6.

The embodiment of the utility model provides a backflow preventing device which comprises a fixed column 1, a lifting mechanism 2, a lifting rod 3, a telescopic rod 4, water retaining cloth 5 and a water retaining cloth storage tank 6. The retaining walls 9 on two sides of the garage entrance are respectively provided with a fixed column 1, and the fixed columns 1 extend along the height direction of the retaining walls 9. Each fixed column 1 is provided with a telescopic rod 4 respectively, and a water retaining cloth 5 is arranged between the two telescopic rods 4. A water retaining cloth storage groove 6 is formed in the ground between the two fixing columns 1, and the water retaining cloth storage groove 6 extends along the width direction of the garage entrance. A lifting mechanism 2 is respectively arranged at the top of each fixed column 1. A lifting rod 3 is connected between the two lifting mechanisms 2, the lifting rod 3 is connected with one end of a water retaining cloth 5, and the other end of the water retaining cloth 5 is fixed at the bottom of a water retaining cloth storage groove 6. The lifting mechanism 2 can drive the lifting rod 3 to move up and down so as to expand or retract the water retaining cloth 5. In practical application, when no flood occurs, the water retaining cloth 5 is stored in the water retaining cloth storage tank 6, so that normal traffic of vehicles is not affected; when the flood occurs, the lifting mechanism 2 drives the lifting rod 3 to rise, and the lifting rod 3 rises to drive the water retaining cloth 5 to be unfolded, so that the water retaining cloth 5 can be unfolded rapidly to block rainwater which is diffused into a garage, the flood control efficiency is high, and accumulated water can be effectively prevented from being diffused into the garage.

In practice, the lifting mechanism 2 comprises a motor 21, a drum 22, a flexible cord 23 and a closable hook 24. The motor 21 is fixed on the fixed column 1, and the output end of the motor 21 is connected with the winding drum 22. As shown in fig. 3, the fixing post 1 is provided with a through hole, and the motor 21 is installed in the through hole, so that heat dissipation is performed during the working process of the motor 21, and the service life of the motor 21 is prolonged.

With continued reference to fig. 9, one end of the flexible cable 23 is fixed to the drum 22, the other end of the flexible cable 23 is connected to the closable hook 24, and the other end of the closable hook 24 is connected to the lifting rod 3, so that when the motor 21 drives the drum 22 to rotate, the drum 22 can retract the flexible cable 23, and the flexible cable 23 can drive the lifting rod 3 to move up and down along the height direction of the fixed column 1. In practical application, when flood occurs, the motor 21 rotates forward to drive the winding drum 22 to rotate forward, the winding drum 22 rotates forward to tighten the flexible rope 23, the lifting rod 3 moves upwards along with tightening of the flexible rope 23, the lifting rod 3 moves upwards to drive the water retaining cloth 5 to be unfolded, and when the lifting rod 3 rises to a designated position, the motor 21 stops working, and at the moment, the water retaining cloth 5 can block rainwater which overflows into a garage, so that a flood control effect is achieved; when flood is eliminated, the motor 21 rotates reversely to drive the winding drum 22 to rotate reversely, the winding drum 22 rotates reversely to loosen the flexible rope 23, the lifting rod 3 moves downwards along with the loosening of the flexible rope 23, and the lifting rod 3 moves downwards to drive the water retaining cloth 5 to be retracted. The expansion and the retraction of the water retaining cloth 5 are controlled by the motor 21, so that the manual expansion and the retraction are not needed, and the automation degree is high. Meanwhile, the spreading efficiency of the water retaining cloth 5 is higher, and the flood control efficiency is greatly improved.

With continued reference to fig. 11, two hanging rings 3a are provided on the top of the lifting rod 3, the two hanging rings 3a are respectively located at two ends of the lifting rod 3, and the two hanging rings 3a are respectively connected with closable hooks 24 at corresponding positions. In practical application, through setting up two link 3a at the top of lift bar 3, can realize the lift bar 3 fast with the connection of hoist mechanism 2 with dismantle, promoted lift bar 3 by a wide margin and hoist mechanism 2's dismouting efficiency.

With continued reference to fig. 2, the anti-backflow device further includes a water level sensor 7, a sump 8, and a controller. A water collecting pit 8 is arranged at one end of the fixed column 1, which is far away from the retaining wall 9, and a water level sensor 7 is arranged in the water collecting pit 8. The water level sensor 7 is electrically connected to a controller, which is electrically connected to the motor 21. In practical application, the water level in the water pit 8 is monitored in real time through the water level sensor 7, meanwhile, the water level sensor 7 can also transmit the water level information to the controller, the controller compares the received water level information with a preset water level, when the water level information is more than or equal to the preset water level, the controller controls the motor 21 to rotate positively, the motor 21 rotates positively to drive the winding drum 22 to rotate positively, the winding drum 22 rotates positively to tighten the flexible rope 23, the lifting rod 3 moves upwards along with tightening of the flexible rope 23, the lifting rod 3 moves upwards to drive the water retaining cloth 5 to be unfolded, after the lifting rod 3 rises to a specified position, the motor 21 stops working, and at the moment, the water retaining cloth 5 can block rainwater which overflows into a garage, so that a flood control effect is achieved; when the water level information is lower than the preset water level, the controller controls the motor 21 to reversely rotate, the motor 21 reversely rotates to drive the winding drum 22 to reversely rotate, the winding drum 22 reversely rotates to loosen the flexible rope 23, the lifting rod 3 moves downwards along with the loosening of the flexible rope 23, and the lifting rod 3 moves downwards to drive the water retaining cloth 5 to be folded. Through setting up water level sensor 7, sump 8 and controller, improved the precision of flood control, do not need manual control motor 21, the degree of automation of flood control is high and flood control is efficient.

With continued reference to fig. 6, the anti-backflow device further includes a drainage mechanism 12. The drain mechanism 12 includes a drain pipe 121 and a check valve 122. The water inlet end of the drain pipe 121 is arranged at the bottom of the water collecting pit 8, and the water outlet end of the drain pipe 121 is communicated with municipal pipelines. A check valve 122 is provided on the drain pipe 121. In practical application, the drain pipe 121 can drain the accumulated water in the water collecting pit 8, so as to avoid overflow phenomenon caused by excessive accumulated water in the water collecting pit 8. Meanwhile, a check valve 122 is installed at the end of the drain pipe 121 to prevent the drain pipe 121 from being in a rainwater backflow phenomenon.

With continued reference to fig. 12, the anti-backflow device further includes a water deflector 10. Each fixed column 1 is provided with a water retaining wing 10, the water retaining wings 10 extend along the height direction of the fixed column 1, and the water retaining wings 10 are positioned on one side of the water retaining cloth 5, which is away from the garage entrance. In practical application, the water retaining wing 10 not only can support the water retaining cloth 5 and ensure the flood control effect of the water retaining cloth 5, but also can prevent rainwater from penetrating into the garage from the fixed telescopic rod 4 of the fixed column 1 by the water retaining wing 10, thereby improving the flood control effect of the backflow prevention device.

With continued reference to fig. 6, the anti-backflow device further includes a support mechanism 11. The support mechanism 11 includes a plurality of lever barrels 111, a drop-off prevention member 112, and a support lever 113. The plurality of pole section of thick bamboo 111 are fixed in the bottom of manger plate cloth storage tank 6 along the width direction interval of garage entry, and pole section of thick bamboo 111 extends along the direction of height of manger plate cloth 5, and pole section of thick bamboo 111 is located the one side that faces away from the garage entry of manger plate cloth 5. Each of the pole barrels 111 is provided with a support pole 113, one end of the support pole 113 can slide in the pole barrel 111, and the other end of the support pole 113 is connected to the top end of the water retaining cloth 5. An anti-drop member 112 is provided between the support rod 113 and the rod tube 111. In practical application, when no flood occurs, the water retaining cloth 5 is stored in the water retaining cloth storage tank 6, and the support rod 113 is stored in the rod barrel 111; when the flood occurs, the lifting mechanism 2 drives the lifting rod 3 to rise, the lifting rod 3 rises to drive the water retaining cloth 5 to be unfolded, and the water retaining cloth 5 is unfolded to drive the supporting rod 113 to rise, so that the supporting rod 113 can support the water retaining cloth 5, the flood control effect of the water retaining cloth 5 is improved, and damage to the water retaining cloth 5 caused by extrusion of a large amount of accumulated water to the water retaining cloth 5 is avoided.

With continued reference to fig. 4, a plurality of drain holes 111a are provided in the bottom of the stem tube 111. In practical applications, since there may be water accumulation in the shaft tube 111, the water accumulation in the shaft tube 111 can be discharged by providing the drain hole 111a, so that rainwater is prevented from accumulating in the shaft tube 111 to keep the inside of the shaft tube 111 in a dry state.

With continued reference to fig. 13, the highest of the lever cylinder 111 is higher than the bottom of the water cloth storage tank 6. In practical application, the highest position of the rod barrel 111 is higher than the bottom of the water-retaining cloth storage groove 6, so that rainwater in the water-retaining cloth storage groove 6 is prevented from entering the rod barrel 111.

With continued reference to fig. 5, the anti-falling member 112 includes a latch 112a and a latch groove 112b. A clamping block 112a is fixed on the top of the rod barrel 111, and the clamping block 112a is positioned in the inner cavity of the rod barrel 111. A clamping groove 112b is formed in the bottom of the support rod 113, and the clamping groove 112b is located on the outer side wall of the support rod 113. The clamping block 112a can be clamped in the clamping groove 112b so as to prevent the supporting rod 113 from falling out of the rod barrel 111. In practical application, when the water retaining cloth 5 is unfolded, the top of the supporting rod 113 can rise along with the water retaining cloth 5, so that the bottom of the supporting rod 113 is driven to slide in the rod barrel 111, and when the supporting rod 113 is unfolded to a certain height, the clamping block 112a arranged at the top of the rod barrel 111 can be clamped with the clamping groove 112b arranged at the bottom of the supporting rod 113, so that the supporting rod 113 is prevented from falling out of the rod barrel 111, the supporting rod 113 can always support the water retaining cloth 5, and the reliability of the supporting mechanism 11 is further guaranteed.

In this specification, each embodiment is described in a progressive manner, and the same or similar parts of each embodiment are referred to each other, and each embodiment is mainly described as a difference from other embodiments.

The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the present application; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced with equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions.

Claims (10)

1. The anti-backflow device is characterized by comprising a fixed column (1), a lifting mechanism (2), a lifting rod (3), a telescopic rod (4), water retaining cloth (5) and a water retaining cloth storage tank (6);

the retaining walls (9) at two sides of the garage inlet are respectively provided with a fixed column (1), and the fixed columns (1) extend along the height direction of the retaining walls (9);

each fixing column (1) is respectively provided with one telescopic rod (4), and a water retaining cloth (5) is arranged between the two telescopic rods (4);

the water retaining cloth storage grooves (6) are formed in the ground between the two fixing columns (1), and the water retaining cloth storage grooves (6) extend along the width direction of a garage inlet;

the top of each fixed column (1) is provided with a lifting mechanism (2); the lifting rods (3) are connected between the two lifting mechanisms (2), the lifting rods (3) are connected with one end of the water retaining cloth (5), and the other end of the water retaining cloth (5) is fixed at the bottom of the water retaining cloth storage groove (6);

the lifting mechanism (2) can drive the lifting rod (3) to move up and down so as to expand or retract the water retaining cloth (5).

2. The anti-backflow device according to claim 1, characterized in that the lifting mechanism (2) comprises a motor (21), a drum (22), a flexible cable (23) and a closable hook (24);

the motor (21) is fixed on the fixed column (1), and the output end of the motor (21) is connected with the winding drum (22);

one end of the flexible cable (23) is fixed with the winding drum (22), the other end of the flexible cable (23) is connected with the closable hook (24), the other end of the closable hook (24) is connected with the lifting rod (3), so that when the motor (21) drives the winding drum (22) to rotate, the winding drum (22) can retract and release the flexible cable (23), and then the flexible cable (23) can drive the lifting rod (3) to move up and down along the height direction of the fixed column (1).

3. The backflow prevention device according to claim 2, characterized in that two hanging rings (3 a) are arranged on the top of the lifting rod (3), the two hanging rings (3 a) are respectively arranged at two ends of the lifting rod (3), and the two hanging rings (3 a) are respectively connected with the closable hooks (24) at corresponding positions.

4. The backflow prevention device according to claim 2, further comprising a water level sensor (7), a sump (8) and a controller;

the water collecting pit (8) is arranged at one end, deviating from the retaining wall (9), of the fixed column (1), and the water level sensor (7) is arranged in the water collecting pit (8);

the water level sensor (7) is electrically connected with the controller, and the controller is electrically connected with the motor (21).

5. The backflow prevention device of claim 4, further comprising a drainage mechanism (12);

the drainage mechanism (12) comprises a drainage pipe (121) and a check valve (122);

the water inlet end of the water drain pipe (121) is arranged at the bottom of the water collecting pit (8), and the water outlet end of the water drain pipe (121) is communicated with a municipal pipeline;

the check valve (122) is provided on the drain pipe (121).

6. The anti-backflow device of claim 1, further comprising a water blocking fin (10);

each fixed column (1) is provided with a water blocking wing (10), the water blocking wings (10) extend along the height direction of the fixed column (1), and the water blocking wings (10) are positioned on one side, deviating from a garage inlet, of the water blocking cloth (5).

7. The backflow prevention device according to claim 1, further comprising a support mechanism (11);

the supporting mechanism (11) comprises a plurality of rod barrels (111), anti-falling pieces (112) and supporting rods (113);

the plurality of rod cylinders (111) are fixed at the bottom of the water-retaining cloth storage groove (6) at intervals along the width direction of the garage inlet, the rod cylinders (111) extend along the height direction of the water-retaining cloth (5), and the rod cylinders (111) are positioned on one side, away from the garage inlet, of the water-retaining cloth (5);

one supporting rod (113) is arranged in each rod barrel (111), one end of each supporting rod (113) can slide in each rod barrel (111), and the other end of each supporting rod (113) is connected to the top end of each water retaining cloth (5);

the anti-falling piece (112) is arranged between the supporting rod (113) and the rod barrel (111).

8. The backflow prevention device according to claim 7, wherein a plurality of drain holes (111 a) are provided at the bottom of the stem cylinder (111).

9. The backflow prevention device according to claim 7, wherein the highest position of the stem cylinder (111) is higher than the bottom of the water cloth storage tank (6).

10. The backflow prevention device according to claim 7, wherein the falling off prevention member (112) includes a block (112 a) and a block groove (112 b);

the clamping block (112 a) is fixed at the top of the rod barrel (111), and the clamping block (112 a) is positioned in the inner cavity of the rod barrel (111);

the clamping groove (112 b) is formed in the bottom of the supporting rod (113), and the clamping groove (112 b) is located on the outer side wall of the supporting rod (113);

the clamping block (112 a) can be clamped in the clamping groove (112 b) so as to prevent the supporting rod (113) from being separated from the rod barrel (111).

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