A drainage device and its control method

Abstract

This invention discloses a drainage device and its control method, wherein the method includes the following steps: controlling a second water pipe of a multi-stage telescopic pipe to extend downward along a first water pipe, and a third water pipe moving with the movement of the second water pipe; the first, second, and third water pipes are sequentially slidably connected to form a multi-stage telescopic pipe with adjustable length; the outer diameter of the first water pipe is smaller than the inner diameter of the second water pipe; the first water pipe extends into the second water pipe from its front end; controlling the third water pipe to extend downward along the second water pipe; controlling the second water pipe to retract upward along the first water pipe to increase the overlap length between the first and second water pipes and make it greater than a threshold. Before the water pump starts, the second water pipe is first controlled to retract upward relative to the first water pipe to increase the overlap length between them, thereby effectively enhancing the bending and torsional resistance of the weak connection area and preventing the first water pipe from bending and deforming during the pumping process.

Description

Technical Field

[0001] This invention relates to the field of drainage, and more particularly to a drainage device and its control method. Background Technology

[0002] Drainage operations often employ drainage devices equipped with multi-stage telescopic pipes. These pipes typically consist of a first, second, and third water pipe that slide and nest sequentially. The outer diameter of the first pipe is smaller than the inner diameter of the second pipe, and the first pipe extends from the front end of the second pipe, forming a nested structure that can slide relative to each other. In actual operation, the entire multi-stage telescopic pipe is usually tilted to the target position, and then driven to extend stage by stage, allowing the water pump connected to the end to be submerged in water for drainage. Under heavy drainage loads, the bending moment and axial force on the multi-stage telescopic pipe increase significantly. Because the expansion and contraction functions of the sections rely mainly on sliding fit, lacking rigid support, the pipes are subjected to large torques under load, making them prone to bending, reducing structural strength, and affecting the stability of the drainage operation. Summary of the Invention

[0003] Therefore, it is necessary to provide a drainage device and its control method to solve the problem that water pipes lack rigid support, are subjected to large torques under load, are prone to bending, reduce structural strength, and affect the stability of drainage operations.

[0004] To achieve the above objectives, the inventors provide a method for controlling a drainage device, comprising the following steps:

[0005] The second water pipe of the multi-stage telescopic pipe extends downward along the first water pipe, and the third water pipe moves with the movement of the second water pipe. The first water pipe, the second water pipe, and the third water pipe are slidably connected in sequence to form a multi-stage telescopic pipe with adjustable length. The outer diameter of the first water pipe is smaller than the inner diameter of the second water pipe, and the first water pipe extends into the second water pipe from the front end.

[0006] Control the third water pipe to extend downwards along the second water pipe;

[0007] Control the second water pipe to retract upwards along the first water pipe to increase the overlap length between the first and second water pipes and make it greater than the threshold.

[0008] Furthermore, the overlap length of the first water pipe and the second water pipe is greater than or equal to one-quarter of the length of the first water pipe.

[0009] Furthermore, the outer diameter of the third water pipe is smaller than the inner diameter of the second water pipe, and the third water pipe extends from the rear end of the second water pipe. The outer diameter of the first water pipe is smaller than the inner diameter of the third water pipe, and the first water pipe can extend from the front end of the third water pipe.

[0010] Furthermore, when the second water pipe of the multi-stage telescopic pipe extends downward along the first water pipe, the following steps are also included:

[0011] The second water pipe of the multi-stage telescopic pipe extends downward along the first water pipe by driving the secondary rail to slide along the main rail via the first telescopic rod. The upper end of the secondary rail is slidably connected to the second water pipe, and the lower end of the secondary rail is slidably connected to the main rail. One end of the first telescopic rod is connected to the secondary rail, and the other end of the first telescopic rod is connected to the main rail.

[0012] Furthermore, the process of controlling the third water pipe to extend downward along the second water pipe also includes the following steps:

[0013] The third water pipe is controlled to extend downward along the second water pipe by driving the third water pipe to move away from the second water pipe relative to it. One end of the second telescopic rod is connected to the second water pipe, and the other end of the second telescopic rod is connected to the third water pipe.

[0014] Furthermore, the overlap length of the first and second water pipes is obtained by detecting the relative sliding distance between the main rail and the auxiliary rail using a distance sensor.

[0015] Furthermore, after controlling the second water pipe to retract upwards along the first water pipe, the following steps are also included:

[0016] Control the first water pipe to extend upwards along the second water pipe.

[0017] Furthermore, the fourth water pipe is driven to extend upward along the first water pipe by the third telescopic rod, and the first water pipe is driven to extend upward along the second water pipe. The outer diameter of the fourth water pipe is smaller than the inner diameter of the first water pipe. The fourth water pipe extends into the first water pipe from the front end. One end of the third telescopic rod is connected to the fourth water pipe, and the other end of the third telescopic rod is connected to the sub-rail. The sub-rail is slidably connected to the second water pipe.

[0018] Furthermore, the process of controlling the third water pipe to extend downward along the second water pipe also includes the following steps:

[0019] The water pump is immersed in water, and the water pump is directly or indirectly connected to the third water pipe;

[0020] After controlling the second water pipe to retract upwards along the first water pipe, the following steps are also included:

[0021] Control the water pump to pump water.

[0022] To achieve the above objectives, the inventors also provide a drainage device comprising: a multi-stage telescopic pipe and a controller. The multi-stage telescopic pipe includes a first water pipe, a second water pipe, and a third water pipe, which are sequentially slidably connected. The outer diameter of the first water pipe is smaller than the inner diameter of the second water pipe. The first water pipe extends into the second water pipe from its front end. The controller is used to execute the control method of the drainage device described in any of the above embodiments.

[0023] Unlike existing technologies, the above technical solution has the following beneficial effects:

[0024] Before the water pump is started, this application controls the second water pipe to retract upward relative to the first water pipe to increase the overlap length between the two, thereby effectively enhancing the bending and torsional resistance of the weak connection area and preventing the first water pipe from bending and deforming during the pumping process.

[0025] The above description of the invention is merely an overview of the technical solution of this application. In order to enable those skilled in the art to better understand the technical solution of this application and to implement it based on the description and drawings, and to make the above-mentioned objectives and other objectives, features and advantages of this application easier to understand, the following description is provided in conjunction with the specific embodiments and drawings of this application. Attached Figure Description

[0026] The accompanying drawings are only used to illustrate the principles, implementation methods, applications, features, and effects of specific embodiments of the present invention and other related contents, and should not be considered as limitations on this application.

[0027] Figure 1 This is a flowchart of the control method in this embodiment;

[0028] Figure 2 This is a perspective view of the drainage device in this embodiment;

[0029] Figure 3 This is a schematic diagram showing the overlap length of the first and second water pipes in this embodiment;

[0030] Figure 4 This is a schematic diagram of the rope displacement sensor in this embodiment;

[0031] Figure 5 This is a schematic diagram of the controller connection in this embodiment;

[0032] Figure 6 This is a perspective view of the drainage vehicle in this embodiment.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Multi-stage telescopic pipe; 11. First water pipe; 12. Second water pipe; 13. Third water pipe; 14. Fourth water pipe; 15. Fifth water pipe; 2. Water pump; 3. First telescopic rod; 4. Second telescopic rod; 5. Third telescopic rod; 6. Main rail; 7. Sub-rail; 8. Chassis; 9. Controller; 10. Distance sensor; 10. Pull rope. Detailed Implementation

[0035] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0036] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0037] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0038] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0039] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.

[0040] Unless otherwise specified, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0041] As understood in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments in this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0042] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0043] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this application pertains, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0044] Please see Figures 1 to 6 This embodiment provides a control method for a drainage device, including the following steps:

[0045] Step S101: Control the second water pipe 12 of the multi-stage telescopic pipe 1 to extend downward along the first water pipe 11. The overlap length of the first water pipe 11 and the second water pipe 12 is less than a threshold. The third water pipe 13 moves with the movement of the second water pipe 12. The first water pipe 11, the second water pipe 12, and the third water pipe 13 are sequentially slidably connected to form the multi-stage telescopic pipe 1 with adjustable length. The outer diameter of the first water pipe 11 is smaller than the inner diameter of the second water pipe 12. The first water pipe 11 extends into the second water pipe 12 from the front end.

[0046] Step S102: Control the third water pipe 13 to extend downward along the second water pipe 12;

[0047] Step S103: Control the second water pipe 12 to retract upward along the first water pipe 11 to increase the overlap length of the first water pipe 11 and the second water pipe 12 and make it greater than the threshold.

[0048] The drainage device is typically installed on a drainage vehicle, and its multi-stage telescopic pipe 1 may include three nested water pipe sections. Initially, the water pipe sections are in a partially overlapping, contracted position, reducing the length of the multi-stage telescopic pipe 1. In some embodiments, the multi-stage telescopic pipe 1 may include four, five, or six nested water pipe sections. The pitch of the multi-stage telescopic pipe 1 can be pre-adjusted so that the third water pipe 13 is tilted downwards towards the water surface, allowing the extended water pump 2 to be submerged in the water. The water pump 2 is typically installed at the end of the first-stage water pipe port of the multi-stage telescopic pipe 1.

[0049] When performing a drainage task, the controller 9 first drives the second water pipe 12 downwards, while the first water pipe 11 remains fixed. The second water pipe 12 is moved outwards as much as possible to maximize the length of both the first and second water pipes, causing their overlap to shorten to below a set overlap threshold. At this point, the water pump 2 is not submerged or the water level is insufficient. The controller 9 then drives the third water pipe 13 to extend outwards along the second water pipe 12, allowing the water pump 2 to reach the target water depth. Because the overlap length between the first and second water pipes 11 is too small, the bending resistance of the overlapping and connecting area is insufficient. If the water pump 2 is started in this state for drainage, the first water pipe 11 is prone to bending deformation due to stress. Therefore, before starting the water pump 2, this application controls the second water pipe 12 to retract upwards relative to the first water pipe 11 to increase the overlap length, thereby effectively enhancing the bending and torsional resistance of this weak connecting area and preventing the first water pipe 11 from bending and deforming during the pumping process.

[0050] Please see Figure 3 In some embodiments, the overlap length of the first water pipe 11 and the second water pipe 12 is greater than or equal to one-quarter of the length of the first water pipe. Optionally, the length of the first water pipe 11 is more than 4m, and the overlap length of the first water pipe 11 and the second water pipe 12 is more than 1m, i.e., the threshold is 1m. Preferably, the length of the first water pipe 11 is 4.298m, the length of the second water pipe 12 is 7.966m, and the overlap length is 1.1m. If the first water pipe 11 extends too far from the second water pipe 12, the bending moment it bears will increase significantly. By setting the overlap length to not less than 1.1m, a sufficiently long effective support area can be formed before pumping water, reducing the probability of deflection deformation at the root of the first water pipe 11.

[0051] Please see Figure 2 and Figure 3In some embodiments, the outer diameter of the third water pipe 13 is smaller than the inner diameter of the second water pipe 12, and the third water pipe 13 extends from the rear end of the second water pipe 12. The outer diameter of the first water pipe 11 is smaller than the inner diameter of the third water pipe 13, and the first water pipe 11 can extend from the front end of the third water pipe 13. This structure facilitates both the downward extension of the third water pipe 13 and the upward extension of the first water pipe 1, improving the operational flexibility of the multi-stage telescopic pipe 1. The second water pipe 12 has the largest diameter, followed by the third water pipe 13, and the first water pipe 11 has the smallest. When controlling the retraction of the multi-stage telescopic pipe 1, the first water pipe 11 can be retracted into the third water pipe 13. The second water pipe 12 is the outermost pipe, with its outer wall exposed, and can be assembled onto a drainage vehicle using a suitable structure.

[0052] In some embodiments, when controlling the second water pipe 12 of the multi-stage telescopic pipe 1 to extend downward along the first water pipe 11 in step S101, the control method further includes the following steps:

[0053] The second water pipe 12 of the multi-stage telescopic pipe 1 extends downward along the first water pipe 11 by driving the secondary rail 7 to slide along the main rail 6 via the first telescopic rod 3. The upper end of the secondary rail 7 is slidably connected to the second water pipe 12, and the lower end of the secondary rail 7 is slidably connected to the main rail 6. One end of the first telescopic rod 3 is connected to the secondary rail 7, and the other end of the first telescopic rod 3 is connected to the main rail 6.

[0054] The main rail 6 is installed on both sides of the secondary rail 7, providing sliding support for the secondary rail 7 from below. The secondary rail 7 is installed on both sides of the second water pipe 12, providing sliding support for the second water pipe 12. The sliding direction of the secondary rail 7 and the main rail 6 is the same as the extension and retraction direction of the first telescopic rod 3 and the multi-stage telescopic pipe 1, converting the linear output motion of the first telescopic rod 3 into the directional sliding of the secondary rail 7 along the main rail 6. Through the connection between the secondary rail 7 and the second water pipe 12, the motion is transmitted to the second water pipe 12 of the multi-stage telescopic pipe 1, thereby causing the second water pipe 12 to slide (extend or retract) along the first water pipe 11.

[0055] In some embodiments, the sliding connection between the main rail 6 and the secondary rail 7, and the sliding connection between the secondary rail 7 and the second water pipe 12, can be achieved through a pulley groove structure or a slider groove structure. The main rail 6, the secondary rail 7, and the first telescopic rod 3 can form a first telescopic mechanism.

[0056] In some embodiments, when controlling the third water pipe 13 to extend downward along the second water pipe 12 in step S102, the control method further includes the following steps:

[0057] The third water pipe 13 is controlled to extend downward along the second water pipe 12 by driving the third water pipe 13 to move away from the second water pipe 12. One end of the second telescopic rod 4 is connected to the second water pipe 12, and the other end of the second telescopic rod 4 is connected to the third water pipe 13.

[0058] The extension / retraction direction of the second telescopic rod 4 is consistent with the axial movement direction of the third water pipe 13 relative to the second water pipe 12, and the second telescopic rod 4 is arranged on one side of the second water pipe 12 and the third water pipe 13, with its axis parallel to the axes of the second water pipe 12 and the third water pipe 13. The two ends of the second telescopic rod 4 are respectively connected to the third water pipe 13 and the second water pipe 12, and its extension or retraction action is directly converted into relative displacement between the two. The second telescopic rod 4 can be combined with corresponding wiring to form a second telescopic mechanism.

[0059] Please see Figure 1 In some embodiments, after controlling the second water pipe 12 to retract upward along the first water pipe 11 in step S103, the control method further includes the following steps:

[0060] Step S104: Control the first water pipe 11 to extend upward along the second water pipe 12.

[0061] The extension and retraction of the first water pipe 11 is controlled by the third telescopic rod 5, which can be directly or indirectly connected to the first water pipe 11. The third telescopic rod 5 can be combined with corresponding wiring to form a third telescopic mechanism. In the case of direct connection, one end of the third telescopic rod 5 is connected to the first water pipe 11, and the other end is connected to the subrail 7, the second water pipe 12, or other supportable components. In the case of indirect connection, one end of the third telescopic rod 5 can be connected to the fourth water pipe 14, which is slidably connected to the first water pipe 11, thus forming an indirect relationship between the third telescopic rod 5 and the first water pipe 11.

[0062] Preferably, the fourth water pipe 14 is driven to extend upward along the first water pipe 11 by the third telescopic rod 5, which in turn drives the first water pipe 11 to extend upward along the second water pipe 12. In this configuration, the multi-stage telescopic pipe 1 consists of four nested water pipes. The outer diameter of the fourth water pipe 14 is smaller than the inner diameter of the first water pipe 11. The fourth water pipe 14 extends from the front end of the first water pipe 11. One end of the third telescopic rod 5 is connected to the fourth water pipe 14, and the other end is connected to the secondary rail 7. The secondary rail 7 is slidably connected to the second water pipe 12. In other embodiments, a sixth water pipe can be slidably connected to the front end of the fourth water pipe 14. The sixth water pipe is directly driven by the third telescopic rod to indirectly drive the extension and retraction of the fourth and first water pipes.

[0063] The controller 9 controls the third telescopic rod 5 to first drive the fourth water pipe 14 to extend axially from the front end of the first water pipe 11. Once the fourth water pipe 14 reaches the predetermined extension position, the third telescopic rod 5 continues to extend, causing the first water pipe 11 to extend synchronously from the second water pipe 12 through a linkage. This structure significantly increases the length of the water pipe in the direction of the front end of the second water pipe 12. The direction of the first water pipe 11 is defined as the front, and the direction of the third water pipe 13 is defined as the rear.

[0064] In some embodiments, the first telescopic rod 3, the second telescopic rod 4, and the third telescopic rod 5 can be in the form of hydraulic cylinders, pneumatic cylinders, or electric cylinders, and can be controlled and driven by the controller 9 respectively. Preferably, all three use the same type of driving energy, such as hydraulic cylinders, which facilitates control and wiring and saves costs. Generally, the two ends of the telescopic rods are hinged (such as pin connections) to accommodate small deflections during movement. For example, the second telescopic rod 4 is a hydraulic cylinder, with the cylinder body hinged to the outer wall connecting seat of the second water pipe 12 via a pin, and the piston rod end hinged to the corresponding connecting seat of the third water pipe 13.

[0065] Please see Figure 4 In some embodiments, the overlap length of the first water pipe 11 and the second water pipe 12 can be detected by the distance sensor 10. For example, the distance sensor 10 obtains the overlap length by detecting the outer walls of the first water pipe 11 and the second water pipe 12; or, the distance sensor 10 obtains the overlap length of the first water pipe 11 and the second water pipe 12 by detecting the relative sliding distance between the main rail 6 and the auxiliary rail 7, where the first water pipe 11 can start without relative displacement. Since the auxiliary rail 7 is connected to the second water pipe 12, the sliding distance of the auxiliary rail 7 relative to the main rail 6 directly corresponds to the axial displacement of the second water pipe 12. Under the condition that the first water pipe 11 remains stationary, the displacement of the second water pipe 12 is linearly inversely proportional to the overlap length. Therefore, by monitoring the change in the distance between the main and auxiliary rails 7 in real time by the high-precision distance sensor 10, the overlap length data can be obtained indirectly and continuously without the need to place the sensor inside the water pipe, thus avoiding sealing, wear, and space limitation problems.

[0066] Please see Figure 4 Preferably, the distance sensor 10 is a pull-cord displacement sensor, electrically connected to the controller 9. The body of the pull-cord displacement sensor is mounted on the main rail 6, and the end of the pull cord 101 is mounted on the secondary rail 7. In other embodiments, the distance sensor 10 may also be an ultrasonic sensor, an infrared displacement sensor, or a laser displacement sensor, etc.

[0067] Please see Figure 1 In some embodiments, when controlling the third water pipe 13 to extend downward along the second water pipe 12 in step S102, the control method further includes the following steps:

[0068] Immerse water pump 2 in water, and connect water pump 2 directly or indirectly to the third water pipe 13;

[0069] In step S103, after controlling the second water pipe 12 to retract upward along the first water pipe 11, the control method further includes the following steps:

[0070] Step S105: Control water pump 2 to pump water.

[0071] First, the controller 9 stops the water pump 2 when it is submerged to a preset depth in the water as the third water pipe 13 extends downward along the second water pipe 12. Then, the controller 9 retracts the second water pipe 12 to enhance the rigidity of the connection section; finally, the water pump 2 is started when the structure is in a highly stable state. Because the pumping process generates vibration and fluid load, starting the water pump 2 when the first water pipe 11 is structurally weak (insufficient overlap length) can easily lead to pipe bending or instability. Strictly limiting the start of the water pump 2 to after the second water pipe 12 has retracted and the overlap length meets the requirement significantly improves the structural safety of the system under high loads.

[0072] In some embodiments, the water pump 2 is installed on the last section of the multi-stage telescopic pipe 1. If the third water pipe 13 is the last section, it is installed on the water pump 2, thus the water pump 2 and the third water pipe 13 are directly connected. If a fifth water pipe 15 is slidably connected to the rear end of the third water pipe 13, the water pump 2 is installed on the fifth water pipe 15, thus the water pump 2 and the third water pipe 13 are indirectly connected.

[0073] Please see Figure 6 In some embodiments, the main rail 6 serves as a support structure for the multi-stage telescopic pipe 1 and can be hinged to the chassis 8 of the drainage vehicle, forming a rotatable hinge point. This allows the main rail 6 to pitch around the hinge axis in a vertical plane. To achieve active control of the pitch angle of the main rail 6, the drainage device also includes a pitch mechanism. This mechanism includes a fourth telescopic rod, one end of which is hinged to the chassis 8, and the other end is hinged to the lower part of the main rail 6. When the fourth telescopic rod extends or retracts, it applies a pushing or pulling force to the main rail 6, thereby driving the main rail 6 to lift upwards or fall downwards around its hinge point with the chassis 8, thus adjusting the overall pitch angle. The multi-stage telescopic pipe 1 is adjusted to a suitable tilt angle so that subsequent extension operations can accurately deliver the water pump 2 into the water body.

[0074] Please see Figures 1 to 6 This embodiment also provides a drainage device, which includes a multi-stage telescopic pipe 1 and a controller 9. The multi-stage telescopic pipe 1 includes a first water pipe 11, a second water pipe 12, and a third water pipe 13, which are slidably connected in sequence. The controller 9 is used to execute the control method of the drainage device described in any of the above embodiments. The controller 9 may be a programmable logic controller (PLC), which has pre-stored program logic for executing the control method.

[0075] Please see Figure 5If the first telescopic rod 3, the second telescopic rod 4, and the third telescopic rod 5 are hydraulic cylinders, then the controller 9 is connected to the corresponding solenoid directional valve, controlling the flow of hydraulic oil via electrical signals, thereby driving the piston rod of the hydraulic cylinder to move. At this time, the controller 9 and the hydraulic system achieve control linkage through an electro-hydraulic interface. The water pump 2 is connected to the output control terminal of the controller 9 via a power cable, typically controlled by a relay, contactor, or frequency converter for on / off switching or speed regulation. The real-time displacement signal from the distance sensor 10 is transmitted to the input interface of the controller 9 via analog signal lines or digital communication lines (such as RS485, CAN bus).

[0076] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.

Claims

1. A control method for a drainage device, characterized in that, Includes the following steps: The second water pipe of the multi-stage telescopic pipe extends downward along the first water pipe, and the third water pipe moves with the movement of the second water pipe. The first water pipe, the second water pipe, and the third water pipe are slidably connected in sequence to form a multi-stage telescopic pipe with adjustable length. The outer diameter of the first water pipe is smaller than the inner diameter of the second water pipe, and the first water pipe extends into the second water pipe from the front end. Control the third water pipe to extend downwards along the second water pipe; Control the second water pipe to retract upwards along the first water pipe to increase the overlap length between the first and second water pipes and make it greater than a threshold. When controlling the second water pipe of the multi-stage telescopic pipe to extend downward along the first water pipe, the following steps are also included: The second water pipe of the multi-stage telescopic pipe extends downward along the first water pipe by driving the secondary rail to slide along the main rail via the first telescopic rod. The upper end of the secondary rail is slidably connected to the second water pipe, and the lower end of the secondary rail is slidably connected to the main rail. One end of the first telescopic rod is connected to the secondary rail, and the other end of the first telescopic rod is connected to the main rail.

2. The control method according to claim 1, characterized in that, The overlap length of the first water pipe and the second water pipe is greater than or equal to one-quarter of the length of the first water pipe.

3. The control method according to claim 1, characterized in that, The outer diameter of the third water pipe is smaller than the inner diameter of the second water pipe. The third water pipe extends into the second water pipe from the rear end. The outer diameter of the first water pipe is smaller than the inner diameter of the third water pipe. The first water pipe can extend into the third water pipe from the front end.

4. The control method according to claim 1, characterized in that, When controlling the third water pipe to extend downward along the second water pipe, the following steps are also included: The third water pipe is controlled to extend downward along the second water pipe by driving the third water pipe to move away from the second water pipe relative to it. One end of the second telescopic rod is connected to the second water pipe, and the other end of the second telescopic rod is connected to the third water pipe.

5. The control method according to claim 1, characterized in that, The overlap length of the first and second water pipes is obtained by detecting the relative sliding distance between the main and auxiliary rails using a distance sensor.

6. The control method according to claim 1, characterized in that, After controlling the second water pipe to retract upwards along the first water pipe, the following steps are also included: The first water pipe extends upward along the second water pipe by controlling the third telescopic rod.

7. The control method according to claim 6, characterized in that, The fourth water pipe is driven to extend upward along the first water pipe by the third telescopic rod, and the first water pipe is driven to extend upward along the second water pipe. The outer diameter of the fourth water pipe is smaller than the inner diameter of the first water pipe. The fourth water pipe extends into the first water pipe from the front end. One end of the third telescopic rod is connected to the fourth water pipe, and the other end of the third telescopic rod is connected to the secondary rail. The secondary rail is slidably connected to the second water pipe.

8. The control method according to claim 1, characterized in that, When controlling the third water pipe to extend downward along the second water pipe, the following steps are also included: The water pump is immersed in water, and the water pump is directly or indirectly connected to the third water pipe; After controlling the second water pipe to retract upwards along the first water pipe, the following steps are also included: Control the water pump to pump water.

9. A drainage device, characterized in that, The drainage device includes: a multi-stage telescopic pipe and a controller. The multi-stage telescopic pipe includes a first water pipe, a second water pipe and a third water pipe. The first water pipe, the second water pipe and the third water pipe are slidably connected in sequence. The outer diameter of the first water pipe is smaller than the inner diameter of the second water pipe. The first water pipe extends into the second water pipe from its front end. The controller is used to execute the control method of the drainage device according to any one of claims 1 to 8.

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