CN117234247B - Water level dynamic balance control device for recharging well - Google Patents
Water level dynamic balance control device for recharging well Download PDFInfo
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- CN117234247B CN117234247B CN202311336134.6A CN202311336134A CN117234247B CN 117234247 B CN117234247 B CN 117234247B CN 202311336134 A CN202311336134 A CN 202311336134A CN 117234247 B CN117234247 B CN 117234247B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 140
- 230000005540 biological transmission Effects 0.000 claims abstract description 31
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 4
- 239000000725 suspension Substances 0.000 description 8
- 239000003673 groundwater Substances 0.000 description 4
- 238000009435 building construction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Abstract
The invention provides a water level dynamic balance control device for a recharging well, which comprises a floating body assembly, a control board, two balance control doors and a transmission assembly. The body assembly includes: the cylinder frame is vertically and fixedly arranged in the recharging well, and the floating ball is arranged in the cylinder frame in a sliding manner; the two sides of the control panel are connected with the floating ball through elastic connecting pieces; the control door is provided with two symmetrical sliding grooves; the two sliding doors are respectively arranged in the sliding groove in a sliding way; the control ring is rotatably arranged on the end face of the control door; the control ring is provided with two symmetrical and inclined arc-shaped grooves, and the two sliding grooves are provided with two straight line grooves; each sliding rod sequentially passes through the sliding door, the linear groove and the arc groove. The two transmission components are respectively arranged between the two balance control doors and the control panel; when the control panel moves up and down, the two control rings are driven to rotate, and one of the two sliding doors in the two balance control doors is controlled to be opened and closed. The device can ensure the dynamic balance of the water level of the recharging well by controlling the opening degree of the water inlet end and the water outlet end.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a water level dynamic balance control device for a recharging well.
Background
Recharging wells are a construction method for maintaining the ground water level of a building. The foundation pit is required to be dug in the building construction process, when the foundation pit generates water, the water level of the foundation pit is required to be controlled to drop until the water level meets the standard requirement of the water level, and meanwhile, the height consistency of the underground water levels of adjacent buildings is required to be ensured, so that the collapse of the buildings is prevented. Therefore, when building construction is carried out, water is usually filled into the recharging well to maintain the groundwater level of the adjacent building, so as to keep the dynamic balance of the water level inside and outside the deep foundation pit and prevent the surrounding building from collapsing.
To maintain the groundwater level, adjustments are typically made by recharging. The recharging water quantity needs to be controlled in the recharging process. Most of water level regulation and control of recharging wells in the prior art are rough, and control accuracy is low. For example, chinese patent CN202221926495.7 discloses a dynamic balance control device for water level of recharging well, when the water level is too low, the buoyancy of the suspension cylinder is lowered, and the valve column blocking the water inlet pipe is opened by the lever principle until the suspension cylinder is resuspended. The water level control precision is low, the water control line is difficult to reach, and meanwhile, the water level balance problems of small water level change and overhigh water level of the recharging well cannot be solved.
Disclosure of Invention
The invention provides a water level dynamic balance control device for a recharging well, which aims to solve the technical problem of water level dynamic balance in the recharging well. The invention provides the following technical scheme.
A water level dynamic balance control device for a recharging well, wherein one side of the recharging well is provided with a water inlet channel and a water outlet channel along the horizontal direction; the water inlet channel and the water outlet channel are respectively communicated with a water inlet pipe and a water outlet pipe; comprising the following steps:
a float assembly comprising a cartridge and a float ball; the cylinder frame is vertically and fixedly arranged in the recharging well, and the floating ball is arranged in the cylinder frame in a sliding manner;
two groups of elastic connecting pieces are connected with two opposite end points of the floating ball and are in sliding abutting connection with the outer wall of the cylinder frame;
the control board is connected with the two groups of elastic connecting pieces on two sides of the control board and is elastically abutted with the outer wall of the cylinder frame; the control board slides along the height direction of the cylinder frame along with the floating ball according to the water level of the recharging well;
the two balance control doors are respectively arranged in the water inlet channel and the water drainage channel; the balance control door comprises a control door, a control ring, two sliding doors and a sliding rod; the middle part of the control door is provided with a channel; two symmetrical sliding grooves are formed in one end face of the control door, which faces the outer side of the recharging well; the two sliding doors are respectively arranged in the sliding grooves in a sliding manner; the control ring is rotatably arranged on one end face of the control door, which faces the inner side of the recharging well; the control ring is provided with two symmetrical and inclined arc-shaped grooves, and the two sliding grooves are provided with two linear grooves along the length direction; each sliding rod sequentially penetrates through the sliding door, the linear groove and the arc-shaped groove; the control ring rotates to drive the sliding rod to move along the arc-shaped groove, so as to drive the sliding door to adjust the opening of the channel in the chute;
the two transmission components are respectively arranged between the two balance control doors and the control panel; when the control board moves up and down, the two control rings are driven to rotate, one of the two sliding doors in the two balance control doors is controlled to be opened and closed, and the opening degree is adjusted.
Preferably, the transmission assembly comprises:
the rack is fixedly arranged on one side of the control panel facing the control door;
the transmission shaft is rotatably erected between the control board and the control door through the frame plate; the frame plate is fixedly arranged in the water inlet channel or the water outlet channel;
the transmission gear is fixedly arranged at one end of the transmission shaft and meshed with the rack;
a drive gear; the control ring is a toothed ring, and the driving gear is meshed with the toothed ring.
Preferably, the sliding door comprises an adjusting door and a sliding block, one ends of which are fixedly connected with each other; the sliding block is arranged in the sliding groove in a sliding way; the opposite end surfaces of the two regulating doors are planes, and after the two regulating doors are abutted, a circular baffle structure is formed to shield a channel in the middle of the control door;
the two ends of the sliding rod are respectively fixed with a baffle, and the two baffle are respectively abutted with the end faces of the sliding block and the toothed ring.
Preferably, sealing rubber strips are fixedly arranged on the opposite end faces of the two matched adjusting doors respectively.
Preferably, the cylinder frame is of a cylindrical structure with a hollow interior; long strip through grooves are formed in two sides of the cylinder frame; the two elastic connecting pieces are fixedly connected with the floating ball through a short shaft; the two short shafts are respectively arranged in the two long strip through grooves in a sliding mode.
Preferably, the elastic connection member includes:
the floating plates are fixedly connected with the floating balls through the short shafts respectively; the floating plate is provided with a horizontally arranged adjusting groove;
the moving block is fixedly connected with one side of the control board; the moving block is arranged in the adjusting groove in a sliding manner;
the guide rod penetrates through the moving block and is fixedly connected with two ends of the adjusting groove respectively; the guide rod is in sliding fit with the moving block;
the two springs are sleeved on the guide rod; two ends of one spring are respectively connected with one end of the adjusting groove and one end face of the moving block, and two ends of the other spring are respectively connected with the other end of the adjusting groove and the other end face of the moving block.
Preferably, the cylinder frame is fixedly arranged on the wall of the recharging well through a fixed block.
Preferably, the side surface of the control board is provided with graduations along the length direction.
Preferably, the water storage device further comprises a water storage tank; the water inlet pipe is communicated with the reservoir through the booster pump, and the water outlet pipe is communicated with the reservoir.
The invention has the beneficial effects that:
the invention provides a water level dynamic balance control device for a recharging well, which is used for controlling the balance of water inlet and water outlet of the recharging well through a balance control door of a water inlet channel and a balance control door of a water outlet channel, and always maintaining the current water level. When the water level changes, the control panel is driven to move up and down through the floating ball, the opening degrees of the two balance control doors are driven through the transmission assembly, the water level state of the recharging well is changed through the change of the opening degrees of the balance control doors which are changed in real time, and finally the recharging well returns to a steady state again. The device can realize the water level steady state fast, can solve any water level change condition, and control accuracy is higher, also can resume the steady state fast through little aperture change in the face of little water level change.
Drawings
FIG. 1 is a perspective view showing the internal structure of a water level dynamic balance control apparatus for a recharging well according to an embodiment of the present invention;
FIG. 2 is a plan view showing the overall structure of a water level dynamic balance control apparatus for a recharging well according to an embodiment of the present invention;
FIG. 3 is a partial perspective view showing the internal structure of a water level dynamic balance control apparatus for a recharging well according to an embodiment of the present invention;
FIG. 4 is a diagram of a balance control door of a dynamic balance control apparatus for a recharging well according to an embodiment of the present invention;
FIG. 5 is a perspective view of another angle balance control door of the water level dynamic balance control apparatus for a recharging well according to an embodiment of the present invention.
1, recharging a well; 2. a cartridge holder; 3. a fixed block; 4. a control gate; 5. a floating ball; 6. a floating plate; 7. a control board; 8. a water inlet channel; 9. a drainage channel; 10. a rack; 11. a transmission gear; 12. a transmission shaft; 13. a spring; 14. a moving block; 15. a frame plate; 16. a slide bar; 17. an adjusting door; 18. a sliding block; 19. a drive gear; 20. a sealing rubber strip; 21. an arc-shaped long strip groove; 22. a toothed ring.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
To maintain the groundwater level, adjustments are typically made by recharging. The recharging water quantity needs to be controlled in the recharging process. Most of water level regulation and control of recharging wells in the prior art are rough, and control accuracy is low. For example, chinese patent CN202221926495.7 discloses a dynamic balance control device for water level of recharging well, when the water level is too low, the buoyancy of the suspension cylinder is lowered, and the valve column blocking the water inlet pipe is opened by the lever principle until the suspension cylinder is resuspended. Breaking the suspended state of the suspension buoy can be achieved by reaching a certain water level, and maintaining the suspended state again can be achieved by the water level falling beyond a certain range of the suspension buoy. When the underground water level rises, the suspension cylinder is always in a suspension state, and the device cannot control the water level. Therefore, the water level control precision is low, the water level control line is difficult to accurately reach, and the problems of small water level change of the recharging well and water level balance of overhigh water level cannot be solved. To this end, the present embodiment proposes a water level dynamic balance control device for a recharging well, as shown in fig. 1 to 5, comprising a float assembly, a control board 7, two balance control gates and two transmission assemblies.
As shown in fig. 2, fig. 2 is a cross-sectional view of an internal structure, and a water inlet channel 8 and a water drain channel 9 are formed on one side of the recharging well 1 along the horizontal direction; the water inlet channel 8 and the water outlet channel 9 are respectively communicated with a water inlet pipe and a water outlet pipe; in order to complete water level steady-state control and realize steady-state circulation of water inlet and water discharge, the water storage tank is also included; the water inlet pipe is communicated with the reservoir through the booster pump, and the water outlet pipe is communicated with the reservoir.
As shown in fig. 1-5, the float assembly includes a cartridge 2 and a float ball 5; the cylinder frame 2 is fixedly arranged on the wall of the recharging well 1 through a fixed block 3; the cylinder frame 2 is vertically and fixedly arranged in the recharging well 1, and the floating ball 5 is slidably arranged in the cylinder of the cylinder frame 2; the two sides of the control plate 7 are connected with two opposite end points of the floating ball 5 through elastic connecting pieces, and slide along the height direction of the cylinder frame 2 along with the floating ball 5 according to the water level of the recharging well 1; the two balance control doors are respectively arranged in the water inlet channel 8 and the water outlet channel 9; the balance control door comprises a control door 4, a control ring, two sliding doors and a sliding rod 16; the middle part of the control door 4 is provided with a channel; two symmetrical sliding grooves are formed in one end face, facing the outer side of the recharging well, of the control door 4; the two sliding doors are respectively arranged in the sliding groove in a sliding way; the control ring is rotatably arranged on one end face of the control door 4, which faces the inner side of the recharging well; the control ring is provided with two symmetrical and inclined arc-shaped grooves, and the two sliding grooves are provided with two linear grooves along the length direction; each sliding rod 16 sequentially passes through the sliding door, the linear slot and the arc slot; wherein, the control ring rotates to drive the sliding rod 16 to move along the arc-shaped groove, thereby driving the sliding door to adjust the opening of the channel in the chute; the two transmission components are respectively arranged between the two balance control doors and the control panel 7; when the control board 7 moves up and down, the two control rings are driven to rotate, one of the two sliding doors in the two balance control doors is controlled to be opened and closed, and the opening degree is adjusted.
When the device is dynamically adjusted, the floating ball 5 moves up and down in the cylinder frame 2 due to the water level. Preferably, the surface of the control board 7 is abutted with the cylinder body of the cylinder frame 2, and the control board 7 moves up and down with the floating ball 5 in the cylinder frame 2 due to the elastic connecting piece. The current state of the device is a stable state, the floating ball 5 is positioned at the water control line, the opening degrees of the two balance control doors at the water inlet channel and the water discharge channel determine the water inlet amount and the water discharge amount, and the current balance state is maintained.
When the water level descends, the floating ball 5 descends, the connecting pieces on two sides drive the control panel 7 to wholly descend, and at the moment, the two balance control doors are driven by the two groups of transmission assemblies to dynamically adjust. One end of the sliding rod 16 moves along with the inclined arc groove on the control ring to the outside or inside direction of the ring under the rotation drive of the control ring, so that the sliding door on the other end face slides up and down in the sliding groove, the two sliding doors are opened and closed, and the opening degree is changed. At this time, the opening degree of the balance control door of the water inlet channel is increased, and the opening degree of the balance control door of the water outlet channel is reduced and gradually approaches to the opening degree in the initial stable state. When the water level rises, the transmission assembly drives the two balance control doors to open and close reversely, and the two balance control doors are close to the initial stable state dynamically. Therefore, the above structure of this embodiment can carry out water level feedback adjustment fast to accurate regression reaches accuse waterline department, makes the water level of recharging well 1 realize dynamic balance regulation and control.
In order to increase the stability of the overall transmission structure and the effect of dynamic adjustment of the water level, as shown in fig. 3, 4 and 5, fig. 3 is a partial perspective view of the internal structure, fig. 4 is a structural view of the balance control door, and fig. 5 is another angular structural view of the balance control door. The transmission assembly comprises a rack 10, a transmission shaft 12, a transmission gear 11 and a drive gear 19. The rack 10 is fixedly arranged on one side of the control panel 7 facing the control door 4; the transmission shaft 12 is rotatably erected between the control panel 7 and the control door 4 through a frame plate 15; the frame plate 15 is fixedly arranged in the water inlet channel 8 or the water outlet channel 9; the transmission gear 11 is fixedly arranged at one end of the transmission shaft 12 and meshed with the rack 10; the control ring is a toothed ring 22, and the drive gear 19 is meshed with the toothed ring 22. Wherein, the floating ball 5 controls the movement of the control board 7, when the control board 7 moves, the rack 10 drives the transmission gear 11 to rotate, and the transmission shaft 12 drives the driving gear 19 to rotate, so as to drive the toothed ring 22 to rotate, and further drive the sliding door to open and close, namely, the opening degree of the two balance control doors is regulated and controlled through the floating ball 5.
Specifically, the sliding door includes an adjusting door 17 and a sliding block 18, one ends of which are fixedly connected to each other; the sliding block 18 is arranged in the sliding groove in a sliding way; opposite end surfaces of the two adjusting doors 17 are plane, and after the two adjusting doors 17 are abutted, a circular baffle structure is formed to shield a channel in the middle of the control door 4; the two ends of the sliding rod 16 are respectively fixed with a baffle, and the two baffle are respectively abutted with the end surfaces of the sliding block 18 and the toothed ring 22 to ensure the stable sliding of the sliding rod 16 in the linear groove and the arc groove.
When the balance control door is required to be completely closed, sealing rubber strips 20 are respectively fixedly arranged on the opposite end faces of the two matched adjusting doors 17.
In another preferred embodiment, as shown in fig. 3, the cartridge holder 2 has a cylindrical structure with a hollow interior; the two sides of the cylinder frame 2 are provided with long strip through grooves; the two elastic connecting pieces are fixedly connected with the floating ball 5 through a short shaft; the two short shafts are respectively arranged in the two long strip through grooves in a sliding way. The elastic connection comprises a floating plate 6, a moving block 14, a guide bar and two springs 13. The floating plates 6 are fixedly connected with the floating balls 5 through short shafts respectively; the floating plate 6 is provided with a horizontally arranged adjusting groove; the moving block 14 is fixedly connected with one side of the control board 7; the moving block 14 is arranged in the adjusting groove in a sliding way; the guide rods pass through the moving blocks 14 and are fixedly connected with two ends of the regulating groove respectively; the guide rod is in sliding fit with the moving block 14; the two springs 13 are sleeved on the guide rod; two ends of one spring 13 are respectively connected with one end of the adjusting groove and one end face of the moving block 14, and two ends of the other spring 13 are respectively connected with the other end of the adjusting groove and the other end face of the moving block 14. The structure is used for realizing adjustment of the water control line. When the control panel 7 is shifted outwards to be separated from the transmission gear 11, the water control line can be readjusted by adjusting the water level. When the control panel 7 is released, the rack on the control panel 7 is re-meshed with the transmission gear 11, and the water level regulation steady state is maintained again.
In addition, in order to facilitate adjustment of the water control line, the side surface of the control board 7 is provided with graduations in the length direction.
The device provided by the embodiment controls the balance of water inlet and water outlet of the recharging well through the balance control door of the water inlet channel and the balance control door of the water outlet channel, and the current water level is always maintained. When the water level changes, the floating ball 5 drives the control panel 7 to move up and down, the transmission assembly drives the opening of the two balance control doors, the water level state of the recharging well is changed through the change of the opening of each balance control door which is changed in real time, and finally the recharging well returns to a steady state again. The device can realize the water level steady state fast, can solve any water level change condition, and control accuracy is higher, also can resume the steady state fast through little aperture change in the face of little water level change.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (9)
1. A water level dynamic balance control device for a recharging well, wherein a water inlet channel (8) and a water outlet channel (9) are arranged on one side of the recharging well (1) along the horizontal direction; the water inlet channel (8) and the water outlet channel (9) are respectively communicated with a water inlet pipe and a water outlet pipe;
characterized by comprising the following steps:
the floating body assembly comprises a cylinder frame (2) and a floating ball (5); the barrel frame (2) is vertically and fixedly arranged in the recharging well (1), and the floating ball (5) is arranged in the barrel of the barrel frame (2) in a sliding manner;
two groups of elastic connecting pieces are connected with two opposite end points of the floating ball (5) and are in sliding abutting connection with the outer wall of the cylinder frame (2);
the two sides of the control board (7) are respectively connected with the two groups of elastic connecting pieces and elastically abutted with the outer wall of the cylinder frame (2); the control board (7) slides along the height direction of the cylinder frame (2) along with the floating ball (5) according to the water level of the recharging well (1);
the two balance control doors are respectively arranged in the water inlet channel (8) and the water discharge channel (9); the balance control door comprises a control door (4), a control ring, two sliding doors and a sliding rod (16); the middle part of the control door (4) is provided with a channel; two symmetrical sliding grooves are formed in one end face, facing the outer side of the recharging well, of the control door (4); the two sliding doors are respectively arranged in the sliding grooves in a sliding manner; the control ring is rotatably arranged on one end face of the control door (4) towards the inner side of the recharging well; the control ring is provided with two symmetrical and inclined arc-shaped grooves, and the two sliding grooves are provided with two linear grooves along the length direction; each sliding rod (16) sequentially passes through the sliding door, the linear groove and the arc groove; the control ring rotates to drive the sliding rod (16) to move along the arc-shaped groove, so as to drive the sliding door to adjust the opening of the channel in the sliding chute;
the two transmission components are respectively arranged between the two balance control doors and the control panel (7); when the control board (7) moves up and down, the two control rings are driven to rotate, one of the two sliding doors in the two balance control doors is controlled to be opened and closed, and the opening degree is adjusted.
2. The water level dynamic balance control apparatus for a recharging well of claim 1, wherein the transmission assembly comprises:
the rack (10) is fixedly arranged on one side of the control panel (7) facing the control door (4);
the transmission shaft (12) is rotatably erected between the control panel (7) and the control door (4) through a frame plate (15); the frame plate (15) is fixedly arranged in the water inlet channel (8) or the water outlet channel (9);
the transmission gear (11) is fixedly arranged at one end of the transmission shaft (12) and meshed with the rack (10);
a drive gear (19); the control ring is a toothed ring (22), and the driving gear (19) is meshed with the toothed ring (22).
3. The water level dynamic balance control device for a recharging well according to claim 2, wherein the sliding door comprises an adjusting door (17) and a sliding block (18) which are fixedly connected to each other at one end; the sliding block (18) is arranged in the sliding groove in a sliding way; opposite end surfaces of the two regulating doors (17) are planes, and after the two regulating doors (17) are abutted, a circular baffle structure is formed to shield a channel in the middle of the control door (4);
and two ends of the sliding rod (16) are respectively fixed with a baffle, and the two baffle are respectively abutted with the end surfaces of the sliding block (18) and the toothed ring (22).
4. A water level dynamic balance control device for recharging wells according to claim 3, characterized in that sealing strips (20) are fixedly arranged on the opposite end surfaces of the two matched regulating doors (17).
5. The water level dynamic balance control device for a recharging well according to claim 1, wherein the cartridge (2) is of a cylindrical structure with a hollow interior; long strip through grooves are formed in two sides of the cylinder frame (2); the two elastic connecting pieces are fixedly connected with the floating ball (5) through a short shaft; the two short shafts are respectively arranged in the two long strip through grooves in a sliding mode.
6. The water level dynamic balance control apparatus for a recharging well of claim 5, wherein the elastic connection comprises:
the floating plates (6) are fixedly connected with the floating balls (5) through the short shafts respectively; the floating plate (6) is provided with a horizontally arranged adjusting groove;
the moving block (14) is fixedly connected with one side of the control board (7); the moving block (14) is arranged in the adjusting groove in a sliding manner;
the guide rods penetrate through the moving blocks (14) and are fixedly connected with two ends of the adjusting groove respectively; the guide rod is in sliding fit with the moving block (14);
two springs (13) are sleeved on the guide rod; two ends of one spring (13) are respectively connected with one end of the adjusting groove and one end face of the moving block (14), and two ends of the other spring (13) are respectively connected with the other end of the adjusting groove and the other end face of the moving block (14).
7. The water level dynamic balance control device for a recharging well according to claim 1, wherein the cylinder frame (2) is fixedly arranged on the wall of the recharging well (1) through a fixed block (3).
8. The water level dynamic balance control device for a recharging well according to claim 1, wherein the side surface of the control plate (7) is provided with graduations in the length direction.
9. The water level dynamic balance control apparatus for a recharging well of claim 1, further comprising a reservoir; the water inlet pipe is communicated with the reservoir through the booster pump, and the water outlet pipe is communicated with the reservoir.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202311336134.6A CN117234247B (en) | 2023-10-16 | 2023-10-16 | Water level dynamic balance control device for recharging well |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311336134.6A CN117234247B (en) | 2023-10-16 | 2023-10-16 | Water level dynamic balance control device for recharging well |
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| CN117234247B true CN117234247B (en) | 2024-03-01 |
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| CN218116363U (en) * | 2021-08-19 | 2022-12-23 | 杨微 | Water gate that water conservancy project used blocks |
| KR20230058222A (en) * | 2021-10-22 | 2023-05-03 | (주)미농바이오 | Farm waterway management system for a smart farm |
| CN114263153A (en) * | 2021-11-02 | 2022-04-01 | 武汉志宏水利水电设计院 | A drainage structures for flood control flood fighting |
| CN218094559U (en) * | 2022-07-25 | 2022-12-20 | 中铁一局集团(广州)建设工程有限公司 | Water level dynamic balance control device for recharge well |
| CN116024945A (en) * | 2023-03-02 | 2023-04-28 | 黑龙江八一农垦大学 | Isolated partition irrigation device for paddy fertilizer field test |
| CN116732956A (en) * | 2023-05-30 | 2023-09-12 | 扬州市飞龙气动液压设备有限公司 | PLC synchronous self-lifting gate and working method thereof with threshold protection switching circuit |
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