Rainwater collecting device for building roof

Abstract

The utility model relates to the technical field of rainwater collection, in particular to a rainwater collection device for a building roof. A dredging nail is arranged between a bottom groove and a water filtering frame; the dredging nail is fixedly connected with the bottom of the bottom groove and located under the water passing hole. When the water passing hole is blocked, rainwater entering the water filtering frame in unit time is more than rainwater discharged out of the water filtering frame from the water passing hole, further, the water filtering frame compresses an elastic piece on the lower portion under the action of water gravity and moves downwards, and along with continuous downward movement of the water filtering frame, the dredging nail under the water passing hole can dredge the water passing hole to dredge the water filtering frame. When water flows into the water filtering frame, the water flows into the water passing holes, the blocked water passing holes are cleaned to drain the water passing holes, so that the water on the water filtering frame can flow out of the dredged water passing holes to reduce the water on the water filtering frame, and after the water on the water filtering frame is gradually reduced, the gravity is smaller than the elastic force of the elastic piece, the water filtering frame moves upwards to drain the water. Impurities in the rainwater are continuously filtered.

Description

Technical Field

[0001] This utility model relates to the field of rainwater harvesting technology, specifically to a rainwater harvesting device for building roofs. Background Technology

[0002] Water scarcity has become an undeniable factor restricting the sustainable economic development of human society. Whether in urban or rural planning, buildings occupy a very large area, and rainwater often flows into sewers after falling on buildings, resulting in a significant waste of rainwater resources. To reduce this waste, rainwater harvesting systems are typically installed on building rooftops to collect and reuse rainwater.

[0003] Currently, rainwater collection mechanisms for building roofs mainly consist of three parts: a drainage channel, a drainage pipe, and a storage tank. The drainage channel is installed under the eaves of the building. Rainwater slides down the roof and enters the drainage channel, finally flowing into the storage tank along the drainage pipe, thus collecting the rainwater. For example, a wastewater and rainwater collection and utilization device for houses, with announcement number CN105804178B, includes a wastewater collection device, a recycling device, and a rainwater collection device. The wastewater collection device includes a vegetable washing sink, a vegetable water collection sink, a solids collection sink, a primary screening device, and a final discharge pipe. This device is used to transport the wastewater after washing vegetables to the recycling device. The recycling device includes a water collection tank, a water pump, an inlet pipe, an outlet pipe, and nozzles.

[0004] The above-mentioned common types of rooftop rainwater harvesting devices have the following shortcomings in practical applications: Since the drainage channels are usually set up in the open air facing the eaves of the building roof, dust, dead branches and leaves and other debris easily accumulate in the drainage channels, which not only makes the collected rainwater have a high impurity content, but also easily causes blockage of the drainage pipes, increasing the difficulty of subsequent cleaning and maintenance and increasing maintenance costs. Utility Model Content

[0005] The purpose of this invention is to provide a rainwater collection device for building roofs to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a rainwater collection device for building roofs, including a bottom trough, with mounting frames symmetrically fixedly connected to the lower end of the bottom trough; the mounting frames are installed on the wall below the roof by expansion bolts; a water outlet is provided at the lower part of the bottom trough; the water outlet is connected to an external water storage tank through a pipe; a filter frame is slidably connected inside the bottom trough, and a water passage hole is opened on the filter frame; a drain nail is provided between the bottom trough and the filter frame; the drain nail is fixedly connected to the bottom of the bottom trough, and the drain nail is located directly below the water passage hole; an elastic member for supporting the filter frame is provided between the bottom of the filter frame and the inside of the bottom trough.

[0007] Using the above technical solution, when the water passage hole is blocked, more rainwater enters the filter rack per unit time than rainwater exits from the water passage hole. This causes the rainwater to accumulate on the filter rack. Under the action of gravity, the filter rack compresses the elastic element at the bottom and moves downward. As it continues to move downward, the unblocking nail directly below the water passage hole enters the water passage hole and cleans the blocked water passage hole, thus allowing the water on the filter rack to flow out through the unblocked water passage hole, reducing the amount of water on the filter rack. As the amount of water on the filter rack gradually decreases, the gravity becomes less than the elastic force of the elastic element, and the filter rack moves upward to continue filtering impurities in the rainwater.

[0008] A further improvement of the present invention is that the unblocking nail includes a spike and a water passage; the lower end of the water passage is fixedly connected to the bottom groove; the lower end of the water passage is uniformly provided with through holes along the circumferential direction; a support column is fixedly connected to the upper end of the water passage along the circumferential direction; the spike is fixedly connected to the upper end of the support column; the outer edge of the spike extends to the outer side of the water passage.

[0009] Using the above technical solution, when the unblocking nail is inserted into the water passage hole, by setting a spike on its upper part and connecting it with the spaced support columns, the rainwater on the filter rack can enter the water passage through the gap between the support columns, and then enter the bottom trough through the through hole at its lower part for collection, so as to improve the unblocking efficiency.

[0010] A further improvement of this utility model is that: a telescopic part is slidably connected to the outer side of the bottom trough; a compression cylinder is fixedly installed between the filter frame and the bottom trough; a movable plate is slidably connected inside the compression cylinder; a movable rod is provided at the upper end of the movable plate, one end of the movable rod is fixedly connected to the movable plate, and the other end extends to the outside of the compression cylinder and is fixedly connected to the filter frame; a support spring is sleeved on the movable rod; one end of the support spring abuts against the upper end face of the compression cylinder, and the other end abuts against the lower part of the filter frame.

[0011] A telescopic cylinder is fixedly installed on the outside of the bottom groove; a movable plate is slidably connected inside the telescopic cylinder, and a movable rod is fixedly connected to the upper part of the movable plate; the end of the movable rod away from the movable plate extends to the outside of the telescopic cylinder and is fixedly connected to the telescopic part.

[0012] The cavity of the telescopic cylinder located under the movable plate is connected to the cavity of the telescopic cylinder located under the moving plate through a pipe, and the cavity is filled with a liquid medium.

[0013] By adopting the above technical solution, as the rainwater on the filter rack gradually increases, the filter rack moves downward to compress the movable rod, which in turn pushes the movable plate downward, and then pushes the moving plate upward. As the moving plate moves upward, it drives the moving rod upward and pushes the telescopic part upward, thereby raising the upper edge of the device. This effectively prevents rainwater from overflowing along the upper edge of the device due to blockage of the water passage holes on the filter rack, thus improving the practicality of the device.

[0014] A further improvement of this utility model is that the inner diameter of the compression cylinder is larger than the inner diameter of the telescopic cylinder.

[0015] By adopting the above technical solution, the inner diameter of the compression cylinder is set to be larger than that of the telescopic cylinder. After the filter frame moves down and the movable plate inside the compression cylinder is displaced by a unit displacement, the movable plate inside the telescopic frame needs to move a height greater than the unit displacement to ensure that the volume transfer of the two is the same. This allows the telescopic part to move upward more quickly, improves the response speed of the telescopic part, and reduces the risk of rainwater overflowing from the top after blockage, thereby improving the rainwater collection effect of the device.

[0016] A further improvement of this utility model is that a hook is fixedly installed on the side of the bottom groove near the mounting bracket; a hanging bracket is provided at the bottom of the hook, and the hanging bracket is fixedly connected to the wall by expansion bolts; the hook and the hanging bracket are snapped together.

[0017] The above technical solution involves first installing the bracket onto the wall using fixing bolts, then temporarily installing the device by connecting the bracket to the hook, and finally fixing the mounting frame to the wall by drilling holes to complete the installation of the device. Since the bracket installed first is relatively light, it facilitates the installation process.

[0018] A further improvement of this utility model is that a bending part is provided at the upper edge of the bracket; a buffer pad is provided on the inner side of the bending part.

[0019] By adopting the above technical solution, a bending part is set on the bracket. When the hook is attached to the bracket, the hook will slide along the inner side of the bending part when the lower end of the hook contacts the bending part during actual operation, thereby improving the convenience of installation.

[0020] A further improvement of this utility model is that a slot is provided on the side of the telescopic part near the bottom groove, and a sealing strip is embedded in the slot.

[0021] Using the above technical solution, the telescopic part will move upward under the action of gravity. Since the rainwater collection takes a certain amount of time, the telescopic part will rise slowly. By setting a sealing strip, the sealing between the telescopic part and the side wall of the bottom trough is improved during the rising process, thereby improving the leak-proof performance of the collection device during the collection process.

[0022] A further improvement of this utility model is that: an outwardly turned-out boss is provided at the upper edge of the bottom groove, and a sealing ring is fixedly installed at the lower edge of the boss; the sealing ring is hollow, and an inwardly turned-out flange is provided at the lower edge of the telescopic part.

[0023] Using the above technical solution, after the hole is blocked, as the telescopic part moves upward, the inner flange of the telescopic part will abut against the boss on the bottom groove, thereby squeezing the sealing ring and further strengthening the sealing between the telescopic part and the bottom groove, thus preventing water from flowing out from the gap between them.

[0024] A further improvement of this utility model is that: a slide is provided at the water outlet, and the slide is fixedly connected to the bottom groove; a water outlet bucket is slidably engaged inside the slide, and a flexible pipe is fixedly connected to the water outlet bucket.

[0025] By adopting the above technical solution, the water outlet bucket is connected to the slide frame by sliding the bucket through one side of the slide frame. The water outlet bucket can be tightly fitted with the sliding groove on the slide frame to make the installation of the water outlet bucket stable.

[0026] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows:

[0027] 1. In this utility model, when the water passage hole is blocked, more rainwater enters the filter rack per unit time than rainwater exits from the water passage hole. This causes the rainwater to accumulate on the filter rack. Furthermore, under the action of gravity, the filter rack compresses the elastic element at the bottom and moves downward. As it continues to move downward, the unblocking nail directly below the water passage hole enters the water passage hole and cleans the blocked water passage hole, thus clearing the water passage hole. This allows the water on the filter rack to flow out from the cleared water passage hole, reducing the amount of water on the filter rack. As the amount of water on the filter rack gradually decreases, the gravity becomes less than the elastic force of the elastic element, and the filter rack moves upward to continue filtering impurities in the rainwater.

[0028] 2. In this utility model, when the unblocking nail is inserted into the water passage hole, by setting a spike on its upper part and connecting it with the spaced support columns, rainwater on the filter rack can enter the water passage through the gap between the support columns, and then enter the bottom trough through the through hole at its lower part for collection, thereby improving the unblocking efficiency. At the same time, by conveniently setting the spike on the outer edge of the water passage, the amount of clogging mud and sand entering the water passage can be reduced during unblocking, thereby reducing the risk of blockage. In addition, the diameter of the water passage is smaller than the diameter of the water passage hole, thereby improving the water flow effect during the unblocking process and further enhancing the unblocking effect.

[0029] In this invention, when the water passage holes on the filter rack become clogged, causing the water entering the filter rack to flow in faster than the water exiting, the amount of rainwater on the filter rack gradually increases. This causes the filter rack to move downwards, compressing the movable rod and pushing the movable plate downwards. This reduces the space in the compression cylinder located below the movable plate, allowing the liquid medium (hydraulic oil or water) to enter the cavity in the telescopic cylinder located below the movable plate along the pipe. This pushes the movable plate upwards, which in turn causes the movable rod to move upwards and pushes the telescopic part upwards. This effectively raises the upper edge of the device, preventing rainwater from overflowing along the upper edge of the device due to clogged water passage holes on the filter rack, thus improving the practicality of the device. Attached Figure Description

[0030] The present invention will be further described below with reference to the accompanying drawings.

[0031] Figure 1 This is a schematic diagram of the first overall structure of the present invention;

[0032] Figure 2 This is a schematic diagram of the second overall structure of the present invention;

[0033] Figure 3 This is a schematic diagram of the installation structure of the water outlet bucket of this utility model;

[0034] Figure 4 This is a schematic diagram of the first internal structure of the present invention;

[0035] Figure 5 This is a schematic diagram of the second internal structure of the present invention;

[0036] Figure 6 This is a schematic diagram of the compression cylinder installation structure of this utility model;

[0037] Figure 7 This is a schematic diagram of the installation structure of the hook and hanger of this utility model;

[0038] Figure 8This is a schematic diagram of the installation structure of the sealing ring of this utility model;

[0039] In the diagram: 1. Bottom trough; 2. Mounting bracket; 3. Filter rack; 4. Water passage hole; 5. Unclogging nail; 6. Spike; 7. Water passage; 8. Support column; 9. Through hole; 10. Telescopic part; 11. Compression cylinder; 12. Movable plate; 13. Movable rod; 14. Support spring; 15. Telescopic cylinder; 16. Moving plate; 17. Moving rod; 18. Hook; 19. Hanger; 20. Bending part; 21. Buffer pad; 22. Slot; 23. Sealing strip; 24. Boss; 25. Sealing ring; 26. Flanged edge; 27. Slide; 28. Water outlet hopper; 29. ​​Flexible pipe. Detailed Implementation

[0040] The present invention will be further described in detail below with reference to the embodiments.

[0041] Example 1

[0042] like Figures 1-5 As shown, a rainwater collection device for building roofs includes a bottom trough 1, with mounting frames 2 symmetrically fixedly connected to the lower end of the bottom trough 1; the mounting frames 2 are installed on the wall below the roof by expansion bolts; a water outlet is provided at the lower part of the bottom trough 1; the water outlet is connected to an external water storage tank through a pipe; a filter frame 3 is slidably connected inside the bottom trough 1, and a water passage hole 4 is provided on the filter frame 3; a drain nail 5 is provided between the bottom trough 1 and the filter frame 3; the drain nail 5 is fixedly connected to the bottom of the bottom trough 1, and the drain nail 5 is located directly below the water passage hole 4; an elastic element for supporting the filter frame 3 is provided between the bottom of the filter frame 3 and the inside of the bottom trough 1.

[0043] When the water passage hole 4 is blocked during operation, more rainwater enters the filter rack 3 per unit time than exits from the water passage hole 4. This causes the rainwater to accumulate on the filter rack 3. Under the influence of gravity, the filter rack 3 compresses the lower elastic element and moves downward. As it continues to move downward, the unblocking nail 5 directly below the water passage hole 4 enters the water passage hole 4 and clears the blockage. This allows the water on the filter rack 3 to flow out through the cleared water passage hole 4, reducing the amount of water on the filter rack 3. As the amount of water on the filter rack 3 gradually decreases, the gravity becomes less than the elastic force of the elastic element, and the filter rack 3 moves upward to continue filtering impurities from the rainwater.

[0044] like Figure 4 and Figure 5 As shown, the unblocking nail 5 includes a spiked part 6 and a water-passing part 7; the lower end of the water-passing part 7 is fixedly connected to the bottom groove 1; the lower end of the water-passing part 7 is uniformly provided with through holes 9 along the circumferential direction; a support column 8 is fixedly connected to the upper end face of the water-passing part 7 along the circumferential direction; the upper end of the support column 8 is fixedly connected to the spiked part 6; the outer edge of the spiked part 6 extends to the outer side of the water-passing part 7.

[0045] During operation, when the unblocking nail 5 is inserted into the water passage hole 4, the rainwater on the filter rack 3 can enter the water passage 7 through the gaps between the support columns 8 by setting the spikes 6 on its upper part and connecting them. Then, it enters the bottom groove 1 through the through hole 9 at its lower part and is collected, thereby improving the unblocking efficiency. At the same time, by conveniently setting the spikes 6 on the outer edge of the water passage 7, the amount of clogging mud and sand entering the water passage 7 can be reduced during unblocking, thereby reducing the risk of blockage in the water passage 7. In addition, the diameter of the water passage 7 is smaller than the diameter of the water passage hole 4, thereby improving the water flow effect during the unblocking process and further enhancing the unblocking effect.

[0046] Example 2

[0047] Based on Embodiment 1, this application provides another technical solution, such as... Figure 4 and Figure 6 As shown, a telescopic part 10 is slidably connected to the outer side of the bottom tank 1; a compression cylinder 11 is fixedly installed between the water filter frame 3 and the bottom tank 1; a movable plate 12 is slidably connected inside the compression cylinder 11; a movable rod 13 is provided at the upper end of the movable plate 12, one end of the movable rod 13 is fixedly connected to the movable plate 12, and the other end extends to the outside of the compression cylinder 11 and is fixedly connected to the water filter frame 3; a support spring 14 is sleeved on the movable rod 13; one end of the support spring 14 abuts against the upper end face of the compression cylinder 11, and the other end abuts against the lower part of the water filter frame 3;

[0048] A telescopic cylinder 15 is fixedly installed on the outside of the bottom groove 1; a movable plate 16 is slidably connected inside the telescopic cylinder 15; a movable rod 17 is fixedly connected to the upper part of the movable plate 16; one end of the movable rod 17 away from the movable plate 16 extends to the outside of the telescopic cylinder 15 and is fixedly connected to the telescopic part 10.

[0049] The cavity of the telescopic cylinder 15 located below the movable plate 12 is connected to the cavity of the telescopic cylinder 15 located below the movable plate 16 through a pipe, and the cavity is filled with a liquid medium.

[0050] During operation, when the water passage hole 4 on the water filter rack 3 becomes blocked, causing the water entering the water filter rack 3 to flow in faster than the water exiting, the amount of rainwater on the water filter rack 3 will gradually increase. This causes the water filter rack 3 to move downward, compressing the movable rod 13, which in turn pushes the movable plate 12 downward, reducing the space in the compression cylinder 11 located below the movable plate 12. This allows the liquid medium, hydraulic oil, or water inside to enter the cavity in the telescopic cylinder 15 located below the moving plate 16 along the pipe, thus pushing the moving plate 16 upward. As the moving plate 16 moves upward, it will drive the moving rod 17 upward and push the telescopic part 10 upward, thereby raising the upper edge of the device. This effectively prevents rainwater from overflowing along the upper edge of the device due to the blockage of the water passage hole 4 on the water filter rack 3, thus improving the practicality of the device.

[0051] like Figure 6 As shown, the inner diameter of the compression cylinder 11 is larger than the inner diameter of the telescopic cylinder 15.

[0052] During operation, by setting the inner diameter of the compression cylinder 11 to be larger than the inner diameter of the telescopic cylinder 15, after the filter frame moves down and causes the movable plate 12 inside the compression cylinder 11 to move to a unit displacement, the movable plate 16 inside the telescopic frame needs to move a height greater than the unit displacement to ensure that the volume transfer of the two is the same. This allows the telescopic part 10 to move upward more quickly, improving the response speed of the telescopic part 10. In turn, it reduces the risk of rainwater overflowing from the top after blockage and improves the rainwater collection effect of the device.

[0053] Example 3

[0054] Based on Embodiment 2, this application provides another technical solution, such as... Figure 2 and Figure 7 As shown, a hook 18 is fixedly installed on the side of the bottom groove 1 near the mounting bracket 2; a bracket 19 is provided at the lower part of the hook 18, and the bracket 19 is fixedly connected to the wall by expansion bolts; the hook 18 and the bracket 19 are engaged.

[0055] During operation, due to the relatively large overall size of the equipment and the fact that installation is done at height, directly installing it by first installing the bracket 2 would be inconvenient. Therefore, in this solution, the bracket 19 is first installed on the wall with fixing bolts. Then, the bracket 19 is connected to the hook 18 to achieve temporary installation of the device. Finally, the bracket 2 is fixed to the wall by drilling holes to complete the installation of the device. Since the bracket 19 installed first is relatively light, it provides convenience for the installation process. At the same time, the bracket 19 provides a connection point at the top of the device, thereby improving the connection stability of the device and preventing the device from tipping over due to the accumulation of rainwater and thus improving the safety of the device.

[0056] like Figure 7 As shown, a bend 20 is provided at the upper edge of the bracket 19; a buffer pad 21 is provided on the inner side of the bend 20.

[0057] During operation, by setting a bending part 20 on the bracket 19, when the hook 18 is snapped onto the bracket 19, the hook 18 will slide along the inner side of the bending part 20 after the lower end of the hook contacts the bending part 20, thus improving the convenience of installation. At the same time, the bending part 20 can improve the overall structural strength of the bracket 19, thus strengthening the bracket 19. In addition, by setting a buffer pad 21 on the inner side of the bending part 20, the abnormal noise between the bracket 19 and the hook 18 caused by loose bolts can be avoided during the later use of the device, thus preventing the effect of use.

[0058] like Figure 8 As shown, the telescopic part 10 has a slot 22 on the side near the bottom groove 1, and a sealing strip 23 is embedded in the slot 22.

[0059] During operation, when the water passage hole 4 on the filter frame is blocked, as the amount of rainwater increases, the telescopic part 10 will move upward under the action of gravity. Since the rainwater collection takes a certain amount of time, the telescopic part 10 will rise slowly. By setting a sealing strip 23, the sealing between the telescopic part 10 and the side wall of the bottom tank 1 during the rising process is improved, thereby improving the leak-proof performance of the collection device during the collection process.

[0060] like Figure 8 As shown, an outwardly turned boss 24 is provided at the upper edge of the bottom groove 1, and a sealing ring 25 is fixedly installed at the lower edge of the boss 24; the sealing ring 25 is hollow, and an inwardly turned flange 26 is provided at the lower edge of the telescopic part 10.

[0061] During operation, after the hole is blocked, as the telescopic part 10 moves upward, the inner flange 26 of the telescopic part 10 will abut against the boss 24 on the bottom groove 1, thereby compressing the sealing ring 25 and further strengthening the seal between the telescopic part 10 and the bottom groove 1, thus preventing water from flowing out from the gap between them. At the same time, by setting the sealing ring 25 to a vacuum, when the telescopic part 10 tilts slightly, if one part is not fully compressed, the other side will be over-compressed, which will transfer the medium in the sealing ring 25 on that side to the other side. This ensures that the sealing ring 25 can achieve good sealing performance even when the telescopic part 10 is slightly tilted.

[0062] like Figure 3 As shown, a slide 27 is provided at the water outlet, and the slide 27 is fixedly connected to the bottom trough 1; a water outlet 28 is slidably engaged inside the slide 27, and a flexible tube 29 is fixedly connected to the water outlet 28.

[0063] During operation, blockages are prone to occur at the water outlet, requiring cleaning after blockage. Since the installation location is outdoors at a high altitude, using threaded connections or other fixed installation methods between the water outlet 28 and the bottom trough 1 would cause inconvenience for later maintenance. Therefore, in this solution, the water outlet 28 is connected to the slide 27 via a sliding clip on one side of the slide 27. The water outlet 28 can be tightly fitted with the sliding groove on the slide 27 to ensure stable installation of the water outlet 28.

[0064] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A rainwater collection device for building roofs, comprising a bottom trough (1), wherein mounting frames (2) are symmetrically fixedly connected to the lower end of the bottom trough (1); the mounting frames (2) are installed on the wall below the roof by expansion bolts; characterized in that: The bottom of the trough (1) is provided with a water outlet; the water outlet is connected to an external water storage tank through a pipe; a filter rack (3) is slidably connected inside the bottom trough (1), and a water passage hole (4) is opened on the filter rack (3); a drain nail (5) is provided between the bottom trough (1) and the filter rack (3); the drain nail (5) is fixedly connected to the bottom of the bottom trough (1), and the drain nail (5) is located directly below the water passage hole (4); an elastic element for supporting the filter rack (3) is provided between the bottom of the filter rack (3) and the inside of the bottom trough (1).

2. The rainwater collection device for building roofs according to claim 1, characterized in that: The unclogging nail (5) includes a spike (6) and a water passage (7); the lower end of the water passage (7) is fixedly connected to the bottom groove (1); the lower end of the water passage (7) is uniformly provided with through holes (9) along the circumferential direction; a support column (8) is fixedly connected to the upper end face of the water passage (7) along the circumferential direction; the upper end of the support column (8) is fixedly connected to the spike (6); the outer edge of the spike (6) extends to the outside of the water passage (7).

3. A rainwater collection device for building roofs according to claim 2, characterized in that: A telescopic part (10) is slidably connected to the outer side of the bottom groove (1); a compression cylinder (11) is fixedly installed between the water filter frame (3) and the bottom groove (1); a movable plate (12) is slidably connected inside the compression cylinder (11); a movable rod (13) is provided at the upper end of the movable plate (12), one end of the movable rod (13) is fixedly connected to the movable plate (12), and the other end extends to the outside of the compression cylinder (11) and is fixedly connected to the water filter frame (3); a support spring (14) is sleeved on the movable rod (13); one end of the support spring (14) abuts against the upper end face of the compression cylinder (11), and the other end abuts against the lower part of the water filter frame (3); A telescopic cylinder (15) is fixedly installed on the outside of the bottom groove (1); a movable plate (16) is slidably connected inside the telescopic cylinder (15); a movable rod (17) is fixedly connected to the upper part of the movable plate (16); one end of the movable rod (17) away from the movable plate (16) extends to the outside of the telescopic cylinder (15) and is fixedly connected to the telescopic part (10). The cavity of the telescopic cylinder (15) located below the movable plate (12) is connected to the cavity of the telescopic cylinder (15) located below the movable plate (16) through a pipe, and the cavity is filled with a liquid medium.

4. A rainwater collection device for building roofs according to claim 3, characterized in that: The inner diameter of the compression cylinder (11) is larger than the inner diameter of the telescopic cylinder (15).

5. A rainwater collection device for building roofs according to claim 4, characterized in that: A hook (18) is fixedly installed on the side of the bottom groove (1) near the mounting bracket (2); a bracket (19) is provided at the lower part of the hook (18), and the bracket (19) is fixedly connected to the wall by expansion bolts; the hook (18) and the bracket (19) are engaged.

6. A rainwater collection device for building roofs according to claim 5, characterized in that: The upper edge of the hanger (19) is provided with a bend (20); a buffer pad (21) is provided on the inner side of the bend (20).

7. A rainwater collection device for building roofs according to claim 6, characterized in that: The telescopic part (10) has a slot (22) on the side near the bottom groove (1), and a sealing strip (23) is embedded in the slot (22).

8. A rainwater collection device for building roofs according to claim 7, characterized in that: An outwardly turned boss (24) is provided at the upper edge of the bottom groove (1), and a sealing ring (25) is fixedly installed at the lower edge of the boss (24); the sealing ring (25) is hollow, and an inwardly turned flange (26) is provided at the lower edge of the telescopic part (10).

9. A rainwater collection device for building roofs according to claim 8, characterized in that: A slide (27) is provided at the water outlet, and the slide (27) is fixedly connected to the bottom groove (1); a water outlet bucket (28) is slidably engaged inside the slide (27), and a flexible tube (29) is fixedly connected to the water outlet bucket (28).

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