A backflow prevention device

Abstract

The application discloses a backflow prevention device, belongs to the field of flood control equipment, and solves the problems that current flood control devices are low in flood control efficiency and cannot effectively prevent accumulated water from overflowing. A fixed column is arranged on each of the two side retaining walls of a garage entrance, and the fixed column extends along the height direction of the retaining wall. A telescopic rod is arranged in each fixed column, and a water screen is arranged between the two telescopic rods. A water screen storage groove is formed in the ground between the two fixed columns, and the water screen storage groove extends along the width direction of the garage entrance. A lifting mechanism is arranged at the top of each fixed column. The two lifting mechanisms are connected with a lifting rod, one end of the lifting rod is connected with the water screen, and the other end of the water screen is fixed to the bottom of the water screen storage groove. The lifting mechanism can drive the lifting rod to move up and down, so that the water screen is unfolded or folded. The application is high in flood control efficiency and can effectively prevent accumulated water from overflowing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flood control equipment, in particular to a flood backflow prevention device. BACKGROUND

[0002] When extreme precipitation weather such as heavy rain occurs, short-time heavy precipitation will cause the urban drainage system to be paralyzed, and the excess rainwater cannot be discharged through the municipal pipe network, thereby causing urban flooding. At this time, underground facilities such as underground garages, subways, underground shopping malls and the like are at risk of rainwater backflow, which will cause great losses.

[0003] At present, when heavy rain occurs, sandbags or flood barriers are generally manually transported to the entrances of underground facilities to prevent rainwater from entering, however, this flood control method is not only low in efficiency, but also cannot effectively block the flooding of accumulated water. SUMMARY

[0004] The embodiment of the present application provides a flood backflow prevention device, which solves the problem that the current flood control device is low in flood control efficiency and cannot effectively block the flooding of accumulated water.

[0005] The embodiment of the present application provides a flood backflow prevention device, which solves the problem that the current flood control device is low in flood control efficiency and cannot effectively block the flooding of accumulated water.

[0006] In a possible implementation manner, the lifting mechanism comprises a motor, a winding drum, a flexible cable and a closable hook; the motor is fixed on the fixed column, and an output end of the motor is connected to the winding drum; one end of the flexible cable is fixed to the winding drum, and the other end of the flexible cable is connected to the closable hook; the other end of the closable hook is connected to the lifting rod, so that when the motor drives the winding drum to rotate, the winding drum can wind or unwind the flexible cable, and in turn the flexible cable can drive the lifting rod to move up and down along the height direction of the fixed column.

[0007] In a possible implementation, two hanging rings are arranged at the top of the lifting rod, and the two hanging rings are respectively arranged at the two ends of the lifting rod, and the two hanging rings are respectively connected with the closable hooks at corresponding positions.

[0008] In a possible implementation, the anti-backflow device further comprises a water level sensor, a sump and a controller; the sump is arranged at the end of the fixed column away from the retaining wall, and the water level sensor is arranged in the sump; the water level sensor is electrically connected with the controller, and the controller is electrically connected with the motor.

[0009] In a possible implementation, the anti-backflow device further comprises a drainage mechanism; the drainage mechanism comprises a drainage pipe and a check valve; the water inlet end of the drainage pipe is arranged at the bottom of the sump, the water outlet end of the drainage pipe is communicated with a municipal pipeline; and the check valve is arranged on the drainage pipe.

[0010] In a possible implementation, the anti-backflow device further comprises a water retaining wing; one water retaining wing is arranged on each of the fixed columns, the water retaining wing extends along the height direction of the fixed column, and the water retaining wing is located at the side of the water retaining cloth away from the entrance of the garage.

[0011] In a possible implementation, the anti-backflow device further comprises a supporting mechanism; the supporting mechanism comprises a plurality of rod barrels, anti-falling pieces and supporting rods; the plurality of rod barrels are fixedly arranged at the bottom of the water retaining cloth storage tank along the width direction of the entrance of the garage, the rod barrels extend along the height direction of the water retaining cloth, and the rod barrels are located at the side of the water retaining cloth away from the entrance of the garage; one supporting rod is arranged in each of the rod barrels, one end of the supporting rod can slide in the rod barrel, the other end of the supporting rod is connected to the top end of the water retaining cloth, and the anti-falling pieces are arranged between the supporting rod and the rod barrel.

[0012] In a possible implementation, a plurality of water draining holes are arranged at the bottom of the rod barrel.

[0013] In a possible implementation, the highest position of the rod barrel is higher than the bottom of the water retaining cloth storage tank.

[0014] In a possible implementation, the anti-falling piece comprises a clamping block and a clamping groove; the clamping block is fixed at the top of the rod barrel and located in the inner cavity of the rod barrel; the clamping groove is arranged at the bottom of the supporting rod and located on the outer side wall of the supporting rod; and the clamping block can be clamped in the clamping groove to prevent the supporting rod from being pulled out of the rod barrel.

[0015] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0016] This invention provides an anti-backflow device, which includes fixed columns, a lifting mechanism, a lifting rod, a telescopic rod, a water-blocking cloth, and a water-blocking cloth storage tank. A fixed column is installed on each side of the retaining wall at the garage entrance, extending along the height of the retaining wall. A telescopic rod is installed inside each fixed column, and a water-blocking cloth is installed between two telescopic rods. A water-blocking cloth storage tank is provided in the ground between two fixed columns, extending along the width of the garage entrance. At the top of each fixed column...

[0017] Each section is equipped with a lifting mechanism. A lifting rod connects the two lifting mechanisms, with one end of the lifting rod connected to the water-blocking fabric, and the other end of the fabric fixed to the bottom of the fabric storage tank. The lifting mechanism can move the lifting rod up and down to unfold or retract the water-blocking fabric. In practical applications, when no flood occurs, the water-blocking fabric is stored in the storage tank and will not affect normal vehicle passage; when a flood occurs, the lifting mechanism moves the lifting rod upward, which in turn unfolds the water-blocking fabric, allowing it to quickly deploy and block rainwater from entering the garage. This not only provides high flood control efficiency but also effectively prevents water from overflowing. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are illustrative of the present invention.

[0019] The embodiments described herein are provided in the accompanying drawings. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0020] Figure 1 Schematic diagram of the anti-backflow device provided in the embodiments of this application Figure 1 ;

[0021] Figure 2 This is a schematic diagram of the unfolded structure of the water-blocking cloth of the anti-backflow device provided in the embodiments of this application;

[0022] Figure 3 for Figure 2 Enlarged view of point A in the image;

[0023] Figure 4 for Figure 2 Top view at point B in the diagram;

[0024] Figure 5 A schematic diagram of the support mechanism provided in the embodiments of this application;

[0025] Figure 6 This is a schematic diagram of the water-blocking cloth retraction structure of the anti-backflow device provided in the embodiments of this application;

[0026] Figure 7 Structure diagram of the anti-backflow device provided by the embodiment of the present application Figure 2 ;

[0027] Figure 8 Structure diagram of the connection between the lifting mechanism and the lifting rod provided by the embodiment of the present application

[0028] Figure 9 Enlarged view of C in Figure 8 ;

[0029] Figure 10 Structure diagram of the connection between the water-blocking cloth and the lifting rod provided by the embodiment of the present application

[0030] Figure 11 Enlarged view of D in Figure 10 ;

[0031] Figure 12 Structure diagram of the anti-backflow device provided by the embodiment of the present application Figure 3 ;

[0032] Figure 13 Structure diagram of the anti-backflow device provided by the embodiment of the present application Figure 4 .

[0033] Figure: 1-fixed column; 2-lifting mechanism; 21-motor; 22-winding drum; 23-flexible cable; 24-closable hook; 3-lifting rod; 3a-hanging ring; 4-telescopic rod; 5-water-blocking cloth; 6-water-blocking cloth storage tank; 7-water level sensor; 8-water collecting pit; 9-retaining wall; 10-water-blocking wing; 11-supporting mechanism; 111-rod cylinder; 111a-drainage hole; 112-anti-falling piece; 112a-clamping block; 112b-clamping groove; 113-supporting rod; 12-drainage mechanism; 121-drainage pipe; 122-check valve; 13-cover plate. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0035] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. The terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. In addition, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0036] As shown in Figures 1 to 13 Embodiments of the present application provide a reverse flow prevention device, which comprises a fixed column 1, a lifting mechanism 2, a lifting rod 3, a telescopic rod 4, a water blocking cloth 5 and a water blocking cloth storage tank 6. In practical application, the material of the water blocking cloth 5 is PVC knife scraping cloth, the lifting height is 1.1 meters, and the water blocking height is 1 meter.

[0037] Continuing to refer to Figure 1 As shown in the drawings, a fixed column 1 is arranged on each side of the retaining wall 9 at the entrance of the garage, and the fixed column 1 extends along the height direction of the retaining wall 9. In practical application, the height of the fixed column 1 is set according to actual needs.

[0038] Continuing to refer to Figure 2 As shown in the drawings, a telescopic rod 4 is arranged in each fixed column 1, and a water blocking cloth 5 is arranged between the two telescopic rods 4. Specifically, the water blocking cloth 5 is arranged between the two telescopic rods 4, and the water blocking cloth 5 is unfolded as the lifting rod 3 rises. At the same time, the telescopic rod 4 is also elongated to support the left and right ends of the water blocking cloth 5.

[0039] Continuing to refer to Figure 10 As shown in the drawings, a water blocking cloth storage tank 6 is opened on the ground between the two fixed columns 1, and the water blocking cloth storage tank 6 extends along the width direction of the entrance of the garage. In practical application, when the water blocking cloth 5 is not used, the water blocking cloth storage tank 6 can store the water blocking cloth 5 to avoid the water blocking cloth 5 being exposed to the outside to affect the vehicle passage.

[0040] Continuing to refer to Figure 8As shown, one lifting mechanism 2 is arranged at the top of each fixed column 1. A lifting rod 3 is connected between the two lifting mechanisms 2, and one end of the lifting rod 3 is connected to the water screen 5, and the other end of the water screen 5 is fixed to the bottom of the water screen storage tank 6. The lifting mechanism 2 can drive the lifting rod 3 to move up and down to unfold or fold the water screen 5. In actual application, when no flood occurs, the water screen 5 is stored in the water screen storage tank 6, which does not affect the normal passage of vehicles; when flood occurs, the lifting mechanism 2 drives the lifting rod 3 to rise, and the lifting rod 3 drives the water screen 5 to unfold, so that the water screen 5 can quickly unfold to block the rainwater flowing into the garage, which not only has high flood prevention efficiency, but also can effectively block the water from flowing in.

[0041] Continuing to refer to Figure 7 As shown, a cover plate 13 is arranged at the top of the lifting rod 3, and the size of the cover plate 13 matches the size of the water screen storage tank 6. In actual application, the cover plate 13 can close the top of the water screen storage tank 6, so that the water screen storage tank 6 is in a closed state when the water screen 5 is not used, which not only does not affect the passage of vehicles, but also can prevent sundries from entering the water screen storage tank 6.

[0042] The embodiment of the present application provides a backflow prevention device, which comprises a fixed column 1, a lifting mechanism 2, a lifting rod 3, a telescopic rod 4, a water screen 5 and a water screen storage tank 6. One fixed column 1 is arranged on each side of the retaining wall 9 at the entrance of the garage, and the fixed column 1 extends along the height direction of the retaining wall 9. One telescopic rod 4 is arranged in each fixed column 1, and the water screen 5 is arranged between the two telescopic rods 4. The water screen storage tank 6 is opened on the ground between the two fixed columns 1, and extends along the width direction of the entrance of the garage. One lifting mechanism 2 is arranged at the top of each fixed column 1. The lifting rod 3 is connected between the two lifting mechanisms 2, one end of the lifting rod 3 is connected to the water screen 5, and the other end of the water screen 5 is fixed to the bottom of the water screen storage tank 6. The lifting mechanism 2 can drive the lifting rod 3 to move up and down to unfold or fold the water screen 5. In actual application, when no flood occurs, the water screen 5 is stored in the water screen storage tank 6, which does not affect the normal passage of vehicles; when flood occurs, the lifting mechanism 2 drives the lifting rod 3 to rise, and the lifting rod 3 drives the water screen 5 to unfold, so that the water screen 5 can quickly unfold to block the rainwater flowing into the garage, which not only has high flood prevention efficiency, but also can effectively block the water from flowing in.

[0043] In actual application, the lifting mechanism 2 comprises a motor 21, a winding 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 to the winding drum 22. As shown, Figure 3 As shown, the fixed column 1 is provided with a through hole, and the motor 21 is installed in the through hole, so as to facilitate heat dissipation during the operation of the motor 21, thereby prolonging the service life of the motor 21.

[0044] With reference to the drawings Figure 9 As shown, 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 wind and unwind 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. In actual application, when the flood occurs, the motor 21 rotates forward, the motor 21 drives the winding drum 22 to rotate forward, the winding drum 22 rotates forward to tighten the flexible cable 23, and the lifting rod 3 moves up with the tightening of the flexible cable 23, and the lifting rod 3 drives the water-blocking cloth 5 to unfold, and when the lifting rod 3 rises to the specified position, the motor 21 stops working, at this time the water-blocking cloth 5 can block the rainwater flowing into the garage, thereby achieving the effect of flood control; when the flood subsides, the motor 21 rotates reversely, the motor 21 drives the winding drum 22 to rotate reversely, the winding drum 22 rotates reversely to loosen the flexible cable 23, and the lifting rod 3 moves down with the loosening of the flexible cable 23, and the lifting rod 3 drives the water-blocking cloth 5 to fold. The unfolding and folding of the water-blocking cloth 5 are controlled by the motor 21, and do not need to be unfolded and folded manually, and the degree of automation is high. At the same time, the unfolding efficiency of the water-blocking cloth 5 is high, and the flood control efficiency is greatly improved.

[0045] With reference to the drawings Figure 11 As shown, two hanging rings 3a are arranged at the top of the lifting rod 3, the two hanging rings 3a are respectively located at the two ends of the lifting rod 3, and the two hanging rings 3a are respectively connected with the corresponding closable hooks 24. In actual application, by arranging the two hanging rings 3a at the top of the lifting rod 3, the connection and disassembly of the lifting rod 3 and the lifting mechanism 2 can be quickly realized, and the disassembly efficiency of the lifting rod 3 and the lifting mechanism 2 is greatly improved.

[0046] With reference to the drawings Figure 2As shown, the anti-inversion device further comprises a water level sensor 7, a sump 8 and a controller. The sump 8 is arranged at the end of the fixed column 1 away from the retaining wall 9, and the water level sensor 7 is arranged in the sump 8. The water level sensor 7 is electrically connected with the controller, and the controller is electrically connected with the motor 21. In actual application, the water level in the sump 8 is monitored in real time by the water level sensor 7, and the water level sensor 7 can also transmit the water level information to the controller. The controller compares the received water level information with the preset water level. When the water level information is greater than or equal to the preset water level, the controller controls the motor 21 to rotate forward, and the motor 21 rotates forward to drive the winding drum 22 to rotate forward, and the winding drum 22 rotates forward to tighten the flexible cable 23, and the lifting rod 3 moves upward with the tightening of the flexible cable 23, and the lifting rod 3 moves upward to drive the water screen 5 to unfold. When the lifting rod 3 rises to the specified position, the motor 21 stops working, and at this time the water screen 5 can block the rainwater flowing into the garage, thereby achieving the effect of flood control; when the water level information is lower than the preset water level, the controller controls the motor 21 to rotate reversely, and the motor 21 rotates reversely to drive the winding drum 22 to rotate reversely, and the winding drum 22 rotates reversely to loosen the flexible cable 23, and the lifting rod 3 moves downward with the loosening of the flexible cable 23, and the lifting rod 3 moves downward to drive the water screen 5 to be folded. By arranging the water level sensor 7, the sump 8 and the controller, the accuracy of flood control is improved, and the motor 21 does not need to be manually controlled, so that the degree of automation of flood control is high and the efficiency of flood control is high.

[0047] With reference back to Figure 6 As shown, the anti-inversion device further comprises a drainage mechanism 12. The drainage mechanism 12 comprises a drainage pipe 121 and a check valve 122. The water inlet end of the drainage pipe 121 is arranged at the bottom of the sump 8, and the water outlet end of the drainage pipe 121 is communicated with the municipal pipeline. The check valve 122 is arranged on the drainage pipe 121. In actual application, the drainage pipe 121 is arranged to drain the accumulated water in the sump 8, so as to avoid the phenomenon of excessive overflow of the accumulated water in the sump 8. At the same time, the check valve 122 is installed at the end of the drainage pipe 121, so as to avoid the phenomenon of rainwater inversion of the drainage pipe 121.

[0048] With reference back to Figure 12 As shown, the anti-inversion device further comprises a water screen wing 10. One water screen wing 10 is arranged on each fixed column 1, and the water screen wing 10 extends along the height direction of the fixed column 1, and the water screen wing 10 is located on the side of the water screen 5 away from the garage entrance. In actual application, the water screen wing 10 not only can support the water screen 5 to ensure the flood control effect of the water screen 5, but also can avoid the rainwater from seeping into the garage from the fixed telescopic rod 4 of the fixed column 1, thereby improving the flood control effect of the anti-inversion device.

[0049] With reference back to Figure 6As shown, the anti-inversion device further comprises a supporting 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 barrels 111 are fixed at the bottom of the water screen storage tank 6 along the width direction of the garage entrance, the rod barrels 111 extend along the height direction of the water screen 5, and the rod barrels 111 are located on the side of the water screen 5 away from the garage entrance. Each rod barrel 111 is provided with a supporting rod 113, one end of the supporting rod 113 can slide in the rod barrel 111, and the other end of the supporting rod 113 is connected to the top end of the water screen 5. The anti-falling piece 112 is arranged between the supporting rod 113 and the rod barrel 111. In actual application, when no flood occurs, the water screen 5 is stored in the water screen storage tank 6, at this time the supporting rod 113 is accommodated in the rod barrel 111; when the flood occurs, the lifting mechanism 2 drives the lifting rod 3 to rise, the lifting rod 3 rising drives the water screen 5 to unfold, the water screen 5 unfolding drives the supporting rod 113 to rise, so that the supporting rod 113 can support the water screen 5, improve the flood control effect of the water screen 5, and avoid damage to the water screen 5 caused by a large amount of water pressing the water screen 5.

[0050] Continuing to refer to Figure 4 As shown, a plurality of water draining holes 111a are arranged at the bottom of the rod barrel 111. In actual application, because there may be accumulated water in the rod barrel 111, the water draining holes 111a are arranged to drain the accumulated water in the rod barrel 111, avoid rainwater accumulating in the rod barrel 111, and keep the rod barrel 111 in a dry state.

[0051] Continuing to refer to Figure 13 As shown, the highest part of the rod barrel 111 is higher than the bottom of the water screen storage tank 6. In actual application, the highest part of the rod barrel 111 is arranged to be higher than the bottom of the water screen storage tank 6, which avoids rainwater in the water screen storage tank 6 entering the rod barrel 111.

[0052] Continuing to refer to Figure 5 As shown, the anti-falling piece 112 comprises a clamping block 112a and a clamping groove 112b. The clamping block 112a is fixed at the top of the rod barrel 111 and located in the inner cavity of the rod barrel 111. The clamping groove 112b is arranged at the bottom of the supporting rod 113 and located on the outer side wall of the supporting rod 113. The clamping block 112a can be clamped in the clamping groove 112b to avoid the supporting rod 113 from being pulled out of the rod barrel 111. In actual application, when the water screen 5 is unfolded, the top of the supporting rod 113 can rise with the water screen 5, thereby driving the bottom of the supporting rod 113 to slide in the rod barrel 111, 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, thereby avoiding the supporting rod 113 from being pulled out of the rod barrel 111, so that the supporting rod 113 can always support the water screen 5, and further ensure the reliability of the supporting mechanism 11.

[0053] The various embodiments in the specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the difference from other embodiments.

[0054] The above examples are only used to illustrate the technical solutions of the present application, and are not limited to the present application; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the present application.

Claims

1. A backflow prevention device, characterized by, It includes fixed column (1), lifting mechanism (2), lifting rod (3), telescopic rod (4), water cloth (5) and water cloth storage tank (6); Respectively set up one fixed column (1) on the retaining wall (9) of both sides of garage entrance, the fixed column (1) extends along the height direction of the retaining wall (9); Respectively set up one telescopic rod (4) in each fixed column (1), two telescopic rods (4) are provided with the water cloth (5); The ground between two fixed columns (1) is provided with the water cloth storage tank (6), the water cloth storage tank (6) extends along the width direction of garage entrance; Respectively set up one lifting mechanism (2) on the top of each fixed column (1), two lifting mechanisms (2) are connected with the lifting rod (3), one end of the lifting rod (3) is connected with the water cloth (5), the other end of the water cloth (5) is fixed on the bottom of the water cloth storage tank (6); The lifting mechanism (2) can drive the lifting rod (3) to move up and down to unfold or fold the water cloth (5); The lifting mechanism (2) includes motor (21), winding drum (22), flexible cable (23) and closeable hook (24); The motor (21) is fixed on the fixed column (1), 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 closeable hook (24), the other end of the closeable 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 wind or unwind 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); It also includes water level sensor (7), water collecting pit (8) and controller; The water collecting pit (8) is arranged at the end of the fixed column (1) away from the retaining wall (9), 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); It also includes support mechanism (11); The support mechanism (11) includes a plurality of rod barrels (111), anti-falling pieces (112) and support rods (113); A plurality of rod barrels (111) are fixed on the bottom of the water cloth storage tank (6) along the width direction of garage entrance, the rod barrel (111) extends along the height direction of the water cloth (5), and the rod barrel (111) is located on the side of the water cloth (5) away from the garage entrance; One support rod (113) is arranged in each rod barrel (111), one end of the support rod (113) can slide in the rod barrel (111), and the other end of the support rod (113) is connected to the top end of the water cloth (5); The anti-falling piece (112) is arranged between the support rod (113) and the rod barrel (111); The highest part of the rod cylinder (111) is higher than the bottom of the water-blocking cloth storage tank (6).

2. The backflow preventing device according to claim 1, characterized in that Two hanging rings (3a) are arranged at the top of the lifting rod (3), and the two hanging rings (3a) are respectively located at the two ends of the lifting rod (3) and are connected with the corresponding closable hooks (24).

3. The backflow prevention device of claim 1, wherein Further comprising a drainage mechanism (12); The drainage mechanism (12) comprises 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 the municipal pipeline; The check valve (122) is arranged on the drain pipe (121).

4. The backflow prevention device of claim 1, wherein Further comprising a water-blocking wing (10); One water-blocking wing (10) is arranged on each fixed column (1), the water-blocking wing (10) extends along the height direction of the fixed column (1), and the water-blocking wing (10) is located on the side of the water-blocking cloth (5) away from the entrance of the garage.

5. The backflow prevention device of claim 1, wherein A plurality of water draining holes (111a) are arranged at the bottom of the rod cylinder (111).

6. The backflow prevention device of claim 1, wherein The anti-falling piece (112) comprises a clamping block (112a) and a clamping groove (112b); The clamping block (112a) is fixed at the top of the rod cylinder (111), and the clamping block (112a) is located in the inner cavity of the rod cylinder (111); The clamping groove (112b) is arranged at the bottom of the supporting rod (113), and the clamping groove (112b) is located on the outer side wall of the supporting rod (113); The clamping block (112a) can be clamped in the clamping groove (112b) to avoid the supporting rod (113) from being pulled out of the rod cylinder (111).

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