Foundation pit water level monitoring device and monitoring method for rugged terrain

Abstract

The invention discloses a rugged terrain foundation pit water level monitoring device and method. The rugged terrain foundation pit water level monitoring device comprises a mounting plate, a fixing screw rod is vertically arranged on the edge of the mounting plate, the fixing screw rod penetrates through the mounting plate and is movably connected with the mounting plate, the bottom end of the fixing screw rod is coaxially connected with a reinforcing rod, and a drill bit is arranged at the bottom end of the reinforcing rod; a vertical plate is fixed on the mounting plate, a driving screw penetrates through the axis of the vertical plate and is positioned on two sides of the vertical plate, a driving rope is wound on one side of the driving screw, a floating ball is connected to the other end of the driving rope, a driving gear sleeves the other side of the driving screw, the driving gear is meshed with a rack, a controller is arranged below the rack, and the controller is fixed on the mounting plate. According to the method, after the mounting plate is fixed through the fixing screw, the floating ball moves along with the water level until the rack moves downwards to press a button of the controller to trigger an alarm, and a worker drains water. The problem that the risk is high when the foundation pit in the rugged terrain is monitored manually in the prior art is solved.

Description

Technical Field

[0001] This invention belongs to the field of water level monitoring technology, specifically relating to a water level monitoring device and method for foundation pits in rugged terrain. Background Technology

[0002] Water level monitoring in foundation pits is a core safety assurance component in foundation pit construction, directly impacting pit stability and construction safety. An abnormal rise in water level significantly increases pore water pressure in the soil, reduces shear strength, and can easily lead to collapses, settlement, piping, and other safety accidents, causing substantial economic losses and casualties. Current mainstream monitoring methods employ daily manual monitoring with water level gauges, or utilize structures such as buoys, traction ropes, and displacement conversion components to collect water level data. For example, existing patent application number 202221861961.8 discloses a foundation pit water level monitoring device, whose core principle is to use water level changes to drive mechanical displacement, which is then converted into measurable parameters for continuous water level monitoring. However, current technology has the following drawbacks: 1. Poor adaptability to rugged terrain: Excavation pits in rugged areas such as hillsides are mostly steep slopes and gullies with uneven ground. It is difficult for staff to approach the edge of the pit for manual monitoring, which can easily lead to safety accidents such as slipping and falling. In addition, the traditional device installation structure is either complex and difficult to install, or the fixing structure is simple and cannot withstand the impact of sloping ground and rainwater, which can easily cause it to tip over or slide, resulting in monitoring failure.

[0003] 2. Lack of early warning function: Some existing devices can only collect water level data and do not have an automatic early warning mechanism. Especially at night or in severe weather such as heavy rain, personnel cannot reach the site in time. When the water level rises abnormally, the early warning is delayed, which can easily lead to safety accidents such as collapse, subsidence, and piping.

[0004] 3. Transmission and installation defects: The transmission structure of traditional devices is easily affected by terrain vibration and shifts, resulting in insufficient water level identification accuracy; at the same time, the installation lacks targeted design, the insertion resistance is large in rugged soil or gravel layers, and the vertical pull-out resistance is weak, which can easily cause the device to be driven away from the bottom of the pit by the buoyancy of the float. Summary of the Invention

[0005] The purpose of this invention is to provide a foundation pit water level monitoring device for rugged terrain, which solves the problem of high risk when monitoring foundation pits in rugged terrain by humans in the prior art.

[0006] Another object of the present invention is to provide a method for monitoring the water level in foundation pits in rugged terrain.

[0007] The first technical solution adopted in this invention is a foundation pit water level monitoring device for rugged terrain, including a mounting plate, a fixing screw is vertically arranged on the edge of the mounting plate, the fixing screw passes through the mounting plate and is movably connected to the mounting plate, a reinforcing rod is coaxially connected to the bottom end of the fixing screw, and a drill bit is arranged at the bottom end of the reinforcing rod. A vertical plate is fixed on the mounting plate, and a drive screw passes through the axis of the vertical plate. The drive screw is located on both sides of the vertical plate. A drive rope is wound on one side, and a float is connected to the other end of the drive rope. A drive gear is sleeved on the other side, and the drive gear meshes with a rack. A controller is set below the rack and is fixed on the mounting plate.

[0008] The first technical solution of the present invention is further characterized in that, The controller is fixedly connected to the mounting plate via the base, and the outer side of the controller is covered with a silicone waterproof cover, the edge of which is fixedly connected to the base.

[0009] The drive screw has a spiral winding groove on the side where the drive rope is wound, and the drive rope is wound around the outside of the drive screw along the direction of the spiral winding groove.

[0010] The rack is set vertically, and a guide plate is fitted on the upper part of the rack. A vertical rod is fixed to the back of the guide plate, and the bottom of the vertical rod is fixedly connected to the mounting plate. A pressure plate is fixed to the bottom of the rack, and the pressure plate is located directly above the button on the controller. The controller signal is connected to an alarm.

[0011] The bottom end of the reinforcing rod is fixedly connected to a mounting base, which is then fixedly connected to the drill bit.

[0012] Several limiting rods are arranged around the outside of the reinforcing rod, and the bottom of the limiting rods is hinged to the mounting base through a hinge. A baffle is provided on one side of the mounting base opposite to the limiting rod to limit the opening angle between the limiting rod and the reinforcing rod.

[0013] A push plate is provided at the top of the limiting rod. The push plate is arc-shaped, and the center of the inner arc surface of the push plate is fixed to the top of the limiting rod.

[0014] The second technical solution adopted in this invention is a method for monitoring the water level in foundation pits in rugged terrain, comprising the following steps: S1, rotate the fixing screw to drive the drill bit into the soil or gravel layer to complete the fixing of the mounting plate; S2, the float floats on the surface of the water and rises with the water level. The rise of the float drives the drive screw to rotate, which causes the rack to move downward. At the same time, the push plate is squeezed by the soil layer of the foundation pit, which drives the limit rod to unfold along the hinge, thus reinforcing the installation plate; S3, the rack moves down until the pressure plate presses the button on the controller, triggering an alarm, and the staff drains the water.

[0015] The beneficial effects of this invention are: (1) This invention uses a buoyancy drive and mechanical transmission mechanism composed of a float, a drive rope, and a gear rack to accurately convert water level changes into mechanical pressing actions, automatically triggering the controller to link with the alarm to achieve wireless early warning. This technology eliminates the need for staff to risk approaching the edge of the rugged foundation pit or entering the interior for monitoring, solving the safety hazards of slipping and falling in steep terrain caused by traditional manual monitoring. At the same time, it fills the early warning gap in unattended scenarios such as nighttime and heavy rain, ensuring timely response when water levels are abnormal and effectively preventing safety accidents such as collapse and subsidence.

[0016] (2) This invention employs a conical structure to reduce the insertion resistance of soil or gravel layers, combined with a dual stabilization design of "fixed screw + reinforcing rod + deployable limiting rod": the symmetrical fixed screws ensure the lateral balance of the device, preventing tipping due to tilted ground; the deployable limiting rod automatically unfolds when the device tends to move upwards, through the squeezing action of the push plate and the soil layer, enhancing the vertical pull-out resistance and preventing the device from detaching from the bottom of the pit due to the buoyancy of the float. This significantly improves the ease of installation and long-term stability of the device in complex terrains such as steep slopes and gullies.

[0017] (3) The present invention limits the vertical sliding trajectory of the rack by the cooperation of the guide plate and the upright, avoids the interference of terrain vibration on the transmission structure, ensures the precise linkage between water level change and alarm trigger, and solves the problem of insufficient accuracy caused by transmission deviation of traditional devices; at the same time, the controller is fully enclosed by a silicone waterproof cover to isolate the erosion of rainwater and humid environment, and the simple mechanical transmission structure reduces the failure points, significantly improving the weather resistance and reliability of the device.

[0018] (4) The overall structure of the present invention has no redundant parts, the core components are made of conventional and low-cost materials, and the installation process does not require complicated tools. Workers can complete the operation at the edge of the foundation pit, which greatly reduces the construction and procurement costs. After the device is put into use, it does not require regular maintenance and can operate stably for a long time, especially suitable for foundation pit projects in remote and rugged areas. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the foundation pit water level monitoring device for rugged terrain according to the present invention. Figure 2 This is the present invention. Figure 1 Enlarged structural diagram at point B; Figure 3 This is the present invention. Figure 1 Enlarged structural diagram at point A; Figure 4 This is the present invention. Figure 1 Enlarged structural diagram at point C; Figure 5This is a schematic diagram of the internal structure of the silicone waterproof cover in this invention.

[0020] In the diagram, 1. Guide plate, 2. Pressure plate, 3. Rack, 4. Silicone waterproof cover, 5. Base, 6. Mounting plate, 7. Vertical plate, 8. Drive gear, 9. Float, 10. Vertical rod, 11. Fixing screw, 12. Drive screw, 13. Drive rope, 14. Reinforcing rod, 15. Push plate, 16. Limiting rod, 17. Mounting seat, 18. Hinge, 19. Baffle, 20. Controller, 21. Drill bit. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] Example 1 This invention relates to a foundation pit water level monitoring device for rugged terrain, such as... Figure 1 and Figure 2 As shown, the device includes a mounting plate 6, with a fixing screw 11 vertically inserted through its edge. The fixing screw 11 is threadedly connected to the mounting plate 6, allowing for flexible adjustment of its insertion depth into the soil or gravel layer at the bottom of the pit by rotating the fixing screw 11, adapting to variations in ground flatness in rugged terrain. The bottom end of the fixing screw 11 is coaxially fixedly connected to the reinforcing rod 14, with their axes coinciding to ensure uniform force transmission. The bottom end of the reinforcing rod 14 is integrally equipped with a drill bit 21. The pointed structure of the drill bit significantly reduces the insertion resistance of the fixing screw 11 in complex soil layers in rugged terrain, facilitating rapid fixing of the device by workers in a safe area at the edge of the pit.

[0023] A vertical plate 7 is fixedly attached to the top of the mounting plate 6. A mounting through hole for the drive screw 12 is provided at the axial center of the vertical plate 7. The drive screw 12 passes horizontally through this through hole and rotatably engages with the vertical plate 7, ensuring stable rotation of the drive screw 12 around the vertical plate 7. The drive screw 12 extends to both sides of the vertical plate 7. One side of the screw has a suitable rope winding structure. One end of the drive rope 13 is tightly wound around this rope winding structure, while the other end is firmly connected to a float 9. The float 9 floats in the water-filled area of ​​the pit and can rise and fall synchronously with water level changes to pull the drive rope 13. On the other side of the drive screw 12, a drive gear 8 is fixedly sleeved. The drive gear 8 meshes with the vertically arranged rack 3. The rack 3 is located on one side of the drive gear 8 and extends vertically. A controller 20 is correspondingly installed below it. The controller 20 is securely installed on the top of the mounting plate 6 through a fixed structure to ensure that the rack 3 can accurately trigger the relevant functions of the controller when it moves, so as to realize the effective linkage between water level changes and control signals.

[0024] Example 2 This invention relates to a foundation pit water level monitoring device for rugged terrain, such as... Figure 1 and Figure 2 As shown, it includes a mounting plate 6, with a fixing screw 11 vertically arranged on the edge of the mounting plate 6. The fixing screw 11 passes through the mounting plate 6 and is movably connected to the mounting plate 6. A reinforcing rod 14 is coaxially connected to the bottom end of the fixing screw 11, and a drill bit 21 is provided at the bottom end of the reinforcing rod 14. A vertical plate 7 is fixed on the mounting plate 6. A drive screw 12 passes through the shaft of the vertical plate 7. The drive screw 12 is located on both sides of the vertical plate 7. A drive rope 13 is wound on one side. A float 9 is connected to the other end of the drive rope 13. A drive gear 8 is sleeved on the other side. The drive gear 8 meshes with a rack 3. A controller 20 is set below the rack 3. The controller 20 is fixed on the mounting plate 6.

[0025] Furthermore, a continuous spiral winding groove is provided on one side of the drive screw 12 for winding the drive rope 13. The drive rope 13 is tightly wound around the outside of the drive screw 12 along the spiral trajectory of the spiral winding groove, ensuring that the drive rope can stably pull the drive screw to rotate when the water level changes, and avoiding slippage or transmission deviation.

[0026] Example 3 Based on Embodiment 2 above, in this embodiment, the rack 3 of the foundation pit water level monitoring device for rugged terrain is arranged strictly vertically, with a guide plate 1 tightly fitted on its upper part. The two form a smooth sliding fit, which can effectively limit the sliding trajectory of the rack 3, avoid transmission deviation caused by vibration of rugged terrain, and ensure the accuracy of vertical movement. The back side of the guide plate 1 is firmly fixed to the upright 10. The upright 10 extends vertically downwards, and its bottom is reliably fixed to the mounting plate 6, providing solid support for the guide plate 1 and ensuring the stability of the rack 3 during movement.

[0027] The bottom of the rack 3 is securely connected to the horizontally arranged pressure plate 2 via a fastener. The lower surface of the pressure plate 2 remains flat and precisely corresponds to the top of the trigger button on the controller 20, ensuring that the rack 3 can evenly apply force to press the button when it moves down, avoiding pressing deviation. The controller 20 establishes a stable signal connection with the alarm, which enables rapid transmission of pressing commands. When the button is pressed and triggered, the controller 20 can immediately send an alarm signal to the alarm, ensuring timely response of the early warning function when the water level is abnormal, and adapting to the monitoring needs of unattended operation in rugged terrain.

[0028] Example 4 This embodiment is based on the above embodiment 3, such as Figure 3 As shown, the bottom end of the reinforcing rod 14 of the foundation pit water level monitoring device for rugged terrain is connected to the mounting base 17 by a stable fixing method. The connection between the two is tight and the force is evenly transmitted, which can ensure the stability of the subsequent structure in the complex stress environment of rugged terrain. The bottom end of the mounting base 17 is fixed to the drill bit 21. The overall structure is compact and strong, which can avoid loosening caused by assembly gaps. At the same time, with the help of the pointed structure of the drill bit, the insertion resistance of the device in the soil or gravel layer is further reduced, which is suitable for the installation requirements of rugged terrain.

[0029] Several limiting rods 16 are evenly arranged around the outer side of the reinforcing rod 14 in the circumferential direction. The number and spacing of the limiting rods 16 are adapted to ensure the balance of the device under vertical force. The bottom of each limiting rod 16 is hinged to the mounting base 17 through a hinge 18. The connection method of the hinge 18 allows the limiting rod 16 to have flexible opening and closing freedom. In the initial state, the limiting rod 16 can fit tightly against the outer side of the reinforcing rod 14 without affecting the operation of inserting the entire device into the bottom of the foundation pit.

[0030] A baffle 19 is fixedly installed on one side of each limiting rod 16 on the mounting base 17. The baffle 19 and the mounting base 17 form a solid integrated structure. Its core function is to precisely limit the maximum opening angle between the limiting rod 16 and the reinforcing rod 14. In this embodiment, the maximum included angle between the limiting rod 16 and the reinforcing rod 14 is limited to 60°. This avoids structural deformation or obstruction during insertion due to over-extension of the limiting rod 16, and ensures that the limiting rod 16 forms a stable support angle with the soil layer of the foundation pit after expansion. This effectively improves the vertical pull-out resistance of the device and prevents the device from detaching from the bottom of the foundation pit due to buoyancy of the float or terrain disturbance.

[0031] Example 5 This embodiment is based on embodiment 4 above, such as Figure 4 As shown, the limiting rod 16 of the foundation pit water level monitoring device of the present invention, used in rugged terrain, has a push plate 15 at its top, specially adapted to the pull-out resistance requirements. The push plate 15 has an overall downward-sloping arc structure, which can maximize the contact area with the soil. The center of the inner arc surface of the push plate 15 is connected to the top of the limiting rod 16 by a stable fixing method. The connection point precisely corresponds to the force center of the limiting rod, ensuring that when the soil compresses the push plate, the force can be evenly transmitted to the limiting rod 16, avoiding structural deformation or loosening of the connection caused by uneven local force. This design of fixing the center of the inner arc surface not only ensures the connection strength between the push plate and the limiting rod, but also allows the push plate to smoothly drive the limiting rod to unfold outward along the hinge 18 when subjected to the upward extrusion force of the foundation pit soil, thereby forming a stable supporting engagement state with the soil, effectively strengthening the vertical pull-out resistance of the device.

[0032] like Figure 5 As shown, the controller 20 is securely connected to the mounting plate 6 via the base 5. The base 5 provides a flat and firm mounting reference for the controller, and its fixing method to the mounting plate 6 can resist vibration interference from rugged terrain, ensuring that the controller remains stable during monitoring and avoiding the impact of displacement on signal triggering accuracy. Simultaneously, the outer surface of the controller 20 is entirely covered with a silicone waterproof cover 4. This waterproof cover is made of flexible silicone material, possessing both good sealing performance and moderate elasticity, adapting to the force transmission requirements during subsequent pressing of the pressure plate. The edges of the silicone waterproof cover 4 are tightly connected to the base 5, forming a fully enclosed protective structure that completely isolates rainwater, accumulated water, and moisture from the pit, preventing malfunctions of the controller's internal electronic components due to moisture and ensuring long-term reliable operation of the device in rugged and humid environments.

[0033] Example 6 The present invention provides a method for monitoring the water level in foundation pits in rugged terrain, employing the aforementioned device for monitoring the water level in foundation pits in rugged terrain, and includes the following steps: S1. First, place the mounting plate 6 stably at the preset monitoring position at the bottom of the foundation pit to ensure that the mounting plate 6 is level and to guarantee the accurate operation of the subsequent transmission structure. Then, by rotating the fixing screws 11 symmetrically arranged on the edge of the mounting plate 6, and using the drill bit 21 at the bottom of the reinforcing rod 14 at the bottom of the fixing screw 11, quickly drill into the soil or gravel layer of the rugged terrain. The insertion depth of the fixing screw 11 can be flexibly adjusted according to the difference in ground flatness. Under the action of the drill bit 21, the insertion resistance of complex soil layers is effectively reduced, so that the fixing screw 11 forms a stable engagement with the soil layer, and finally achieves lateral balance and fixation of the mounting plate 6 at the bottom of the foundation pit. S2, the float 9 naturally floats above the water surface in the foundation pit above the mounting plate 6, always maintaining synchronization with the water level. When the water level in the foundation pit rises abnormally due to rainfall, groundwater infiltration, etc., the float 9 floats upward synchronously under the action of buoyancy, and the drive rope 13 fixed to its bottom is pulled and stretched accordingly. Since the drive rope 13 is tightly wound in the spiral rope groove of the drive screw 12, the upward force of the float 9 is converted into the rotational power of the drive screw 12 through the drive rope 13, driving the drive screw 12 to rotate stably around the vertical plate 7. The drive gear 8 at the other end of the drive screw 12 rotates synchronously, forming a precise transmission with the meshing rack 3. Under the constraint of the guide plate 1 and the vertical rod 10, the rack 3 moves smoothly downward in the vertical direction. Meanwhile, as the water level rises, the buoyancy of the float 9 gradually increases. When the buoyancy reaches a certain level, causing the device to slightly move upward, the reinforcing rod 14 moves upward along with the device. At this time, the arc-shaped push plate 15 at the top of the limiting rod 16 is subjected to the reverse extrusion force of the pit soil. Since the push plate 15 adopts an inclined downward arc design, it can smoothly transmit the driving force after being subjected to force, causing the limiting rod 16 to unfold outward along the hinge 18 at the bottom until it is limited to the preset maximum unfolding angle by the baffle 19 on the mounting base 17. After unfolding, the limiting rod 16 fits tightly with the pit soil or pit wall, forming a solid support interlocking structure, which significantly improves the vertical pull-out resistance of the device and prevents the device from detaching from the bottom of the pit due to the buoyancy of the float. S3. As the water level continues to rise, the rack 3 moves vertically downwards, and the horizontal pressure plate 2 fixed to its bottom moves downwards simultaneously, precisely aligning with the trigger button of the controller 20. Because the controller 20 is covered with a highly elastic silicone waterproof cover 4, the downward movement of the pressure plate 2 presses against the cover, causing it to deform elastically. This deformation force is smoothly transmitted to the internal trigger button, ensuring both waterproof sealing and unimpeded transmission. When the water level rises to the preset warning threshold, the pressure plate 2 fully presses the trigger button. The controller 20 immediately receives this mechanical pressing signal and sends a command to the external alarm via wireless communication, quickly triggering the alarm function. After receiving the alarm, personnel can promptly go to the site to investigate the cause of the water accumulation and carry out drainage operations, effectively preventing safety accidents such as pit collapse, settlement, and piping caused by abnormally high water levels.

[0034] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0035] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for monitoring the water level of a foundation pit in rugged terrain, characterized by, The mounting plate (6) is provided with a fixing screw (11) perpendicularly on its edge. The fixing screw (11) passes through the mounting plate (6) and is movably connected to the mounting plate (6). A reinforcing rod (14) is coaxially connected to the bottom end of the fixing screw (11). A drill bit (21) is provided at the bottom end of the reinforcing rod (14). A vertical plate (7) is fixed on the mounting plate (6). A drive screw (12) passes through the shaft of the vertical plate (7). The drive screw (12) is located on both sides of the vertical plate (7). A drive rope (13) is wound on one side. A float (9) is connected to the other end of the drive rope (13). A drive gear (8) is sleeved on the other side. A rack (3) meshes with the drive gear (8). A controller (20) is set below the rack (3). The controller (20) is fixed on the mounting plate (6).

2. The device for monitoring the water level of a foundation pit in rugged terrain according to claim 1, characterized in that, The controller (20) is fixedly connected to the mounting plate (6) via the base (5), and the controller (20) is covered with a silicone waterproof cover (4) on the outside, with the edge of the silicone waterproof cover (4) fixedly connected to the base (5).

3. The device for monitoring the water level of a foundation pit in rugged terrain according to claim 1, characterized in that, The drive screw (12) has a spiral winding groove on one side of the drive rope (13), and the drive rope (13) is wound around the outside of the drive screw (12) along the direction of the spiral winding groove.

4. The device for monitoring the water level of a foundation pit in rugged terrain according to claim 1, characterized in that, The rack (3) is set vertically, and a guide plate (1) is sleeved on the upper part of the rack (3). A vertical rod (10) is fixed on the back side of the guide plate (1), and the bottom of the vertical rod (10) is fixedly connected to the mounting plate (6). A pressure plate (2) is fixed to the bottom of the rack (3). The pressure plate (2) is located directly above the button of the controller (20). The controller (20) is connected to an alarm.

5. The device for monitoring water level in foundation pit in rugged terrain according to claim 1, characterized in that, The bottom end of the reinforcing rod (14) is fixedly connected to a mounting base (17), and the mounting base (17) is fixedly connected to the drill bit (21).

6. The device for monitoring the water level of a foundation pit in rugged terrain according to claim 5, characterized in that, The reinforcing rod (14) is surrounded by several limiting rods (16), and the bottom of the limiting rods (16) is hinged to the mounting base (17) via hinges (18). A baffle (19) is provided on one side of the mounting base (17) relative to the limiting rod (16) to limit the opening and closing angle between the limiting rod (16) and the reinforcing rod (14).

7. The device for monitoring the water level of a foundation pit in rugged terrain according to claim 6, characterized in that, The top of the limiting rod (16) is provided with a push plate (15), which is arc-shaped, and the center of the inner arc surface of the push plate (15) is fixed to the top of the limiting rod (16).

8. A method for monitoring a water level of a foundation pit in a rugged terrain, characterized by, The method of using the foundation pit water level monitoring device according to any one of claims 1 to 7 includes the following steps: S1, rotate the fixing screw (11) to drive the drill bit (21) to drill into the soil or gravel layer, and complete the fixing of the mounting plate (6); S2, the float (9) floats on the surface of the water and rises with the water level. The rise of the float (9) drives the drive screw (12) to rotate, thereby moving the rack (3) downward. At the same time, the push plate (15) is squeezed by the soil layer of the foundation pit, which drives the limit rod (16) to unfold along the hinge (18) to form a reinforcement of the mounting plate (6); S3, the rack (3) moves down until the pressure plate (2) presses the button of the controller (20), triggering an alarm, and the staff drains the water.

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