Foundation pit drainage device based on PLC
By using a PLC-based foundation pit drainage device, water level sensors and a control system are used to automatically drain water, solving the problems of equipment damage and safety hazards caused by water accumulation in coal mine foundation pits, and achieving a safe and efficient drainage effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUAINAN MINING IND GRP
- Filing Date
- 2025-03-31
- Publication Date
- 2026-05-15
AI Technical Summary
The water accumulation in the operating pit at the auxiliary shaft of the coal mine cannot be removed in time, leading to equipment damage, electrical leakage, and personnel safety hazards, which cannot be effectively solved by existing technologies.
A PLC-based pit drainage device is adopted. The first and second water level sensors detect the water level, and the PLC controller and relay control the solenoid valve and diaphragm pump to automatically drain the water and remove the water in a timely manner.
It enables the automatic and timely removal of water accumulated in the foundation pit, reduces the labor intensity of employees, eliminates safety hazards, avoids equipment damage, and ensures the safety of equipment and personnel.
Smart Images
Figure CN224243924U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of coal mine electromechanical technology, and in particular to a PLC-based pit drainage device. Background Technology
[0002] Currently, water accumulation is common in the auxiliary shaft operation pits of coal mines. Due to time constraints during maintenance, maintenance personnel cannot remove the water immediately. The water accumulation in the pit not only affects the safe operation of the equipment, but also causes sensor damage, leakage, and equipment corrosion, resulting in equipment damage. Furthermore, there are safety hazards for personnel during the drainage process. Utility Model Content
[0003] This invention addresses the problem in the prior art where the inability to promptly remove water accumulated in the foundation pit causes equipment damage and safety hazards.
[0004] This utility model solves the above-mentioned technical problems through the following technical solution: a PLC-based foundation pit drainage device, the device including a first water level sensor and a second water level sensor located at different heights in the foundation pit, the first water level sensor and the second water level sensor being respectively connected to two input ports of a PLC controller, the output port of the PLC controller being connected to one end of a relay coil, the other end of the relay coil being connected to a first power supply, one end of a relay auxiliary contact being connected to a second power supply, the other end of the relay auxiliary contact being connected to one end of a solenoid valve, the other end of the solenoid valve being connected to a second power supply, the solenoid valve being located on an air pipe, one end of the air pipe being connected to an air source, the other end of the air pipe being connected to a diaphragm pump, and the diaphragm pump being connected to a water suction pipe in the foundation pit.
[0005] Preferably, the height of the first water level sensor in the foundation pit is less than the height of the second water level sensor in the foundation pit. The position of the first water level sensor in the foundation pit is the low water level, the position of the second water level sensor in the foundation pit is the high water level, and the position between the low water level and the high water level is the medium water level.
[0006] Preferably, the PLC controller is model S7-300, one end of the first water level sensor and the second water level sensor are respectively connected to the first power supply, the other end of the first water level sensor is connected to the input port I1.6 of the PLC controller, and the other end of the second water level sensor is connected to the input port I1.7 of the PLC controller.
[0007] Preferably, the relay model is RH2B-UL, and the output port Q1.0 of the PLC controller is connected to one end of the relay coil.
[0008] Preferably, the first water level sensor and the second water level sensor are DPPI type float level switches.
[0009] Preferably, the solenoid valve is a pneumatic solenoid valve, model 2V025-08.
[0010] Preferably, the diaphragm pump is a pneumatic diaphragm pump, model QYB-10.
[0011] Preferably, the device also includes a host computer connected to a PLC controller.
[0012] Preferably, the first power supply is a 24V power supply, one end of the first water level sensor and the second water level sensor are respectively connected to the positive terminal of the first power supply, and the other end of the relay coil is connected to the negative terminal of the first power supply.
[0013] Preferably, the second power supply is a 12V power supply, one end of the relay auxiliary contact is connected to the positive terminal of the second power supply, and the other end of the solenoid valve is connected to the negative terminal of the second power supply.
[0014] The advantages provided by this utility model are:
[0015] In this invention, the first and second water level sensors are installed at different heights within the foundation pit. When the water level in the pit reaches the position of the second water level sensor, indicating a high water level, it signifies that the water will affect the equipment and drainage is necessary. At this time, both the first and second water level sensors are closed, both input ports of the PLC controller receive a high level, and the output port of the PLC controller outputs a high level, activating the relay. This energizes the solenoid valve, and the air supply to the diaphragm pump via the solenoid valve starts, pumping water to drain the water from the foundation pit. During drainage, when the water level in the pit drops below the low water level, both the first and second water level sensors are disconnected. At this time, both input ports of the PLC controller receive a low level, and the output port of the PLC controller outputs a low level, deactivating the relay. This de-energizes the solenoid valve, stops the air supply to the diaphragm pump, and the diaphragm pump stops working, thus stopping drainage. This invention can drain water from the foundation pit in a timely manner, reduce the labor intensity of workers, eliminate safety hazards when clearing water, and also prevent sensor damage and leakage caused by water accumulation in the foundation pit, avoid equipment corrosion and damage, and effectively protect the safety of personnel and equipment in the auxiliary shaft. Attached Figure Description
[0016] Figure 1 A circuit diagram of a PLC-based foundation pit drainage device provided for an embodiment of this utility model;
[0017] Figure 2 A schematic diagram showing the installation positions of the first water level sensor and the second water level sensor in a PLC-based foundation pit drainage device provided for an embodiment of this utility model;
[0018] Figure 3 A schematic diagram of the host computer display in the PLC-based foundation pit drainage device provided in this embodiment of the utility model;
[0019] In the diagram: 1 First water level sensor, 2 Second water level sensor, 3 PLC controller, 4 Relay, 5 Solenoid valve, 6 Diaphragm pump. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model are described clearly and completely below with reference to specific embodiments and accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.
[0021] like Figure 1 As shown, this embodiment provides a PLC-based foundation pit drainage device, including: a first water level sensor 1, a second water level sensor 2, a PLC controller 3, a relay 4, a solenoid valve 5, and a diaphragm pump 6. Both the first water level sensor 1 and the second water level sensor 2 are placed in the foundation pit at different heights. (See [reference]). Figure 2 In this utility model, the height of the first water level sensor 1 in the foundation pit is less than the height of the second water level sensor 2 in the foundation pit. The position of the first water level sensor 1 in the foundation pit is the low water level, the position of the second water level sensor 2 in the foundation pit is the high water level, and the position between the low water level and the high water level is the middle water level.
[0022] PLC controller 3 is a Siemens 300 series, model S7-300. One end of the first water level sensor 1 is connected to the positive terminal of a 24V power supply, and the other end is connected to input port I1.6 of PLC controller 3. One end of the second water level sensor 2 is connected to the positive terminal of a 24V power supply, and the other end is connected to input port I1.7 of PLC controller 3. The first water level sensor 1 and the second water level sensor 2 are DPPI type miniature float level switches, which can generate open and close signals when affected by the buoyancy of water.
[0023] Relay 4, model RH2B-UL, is connected to one end of the coil of PLC controller 3 via its output port Q1.0. The other end of the coil is connected to the negative terminal of a 24V power supply. One end of the auxiliary contact of relay 4 is connected to the positive terminal of a 12V power supply, and the other end is connected to one end of solenoid valve 5. The other end of solenoid valve 5 is connected to the negative terminal of a 12V power supply. Solenoid valve 5 is located on the air pipe and inside the pneumatic valve control box. Solenoid valve 5 is a pneumatic solenoid valve, model 2V025-08. One end of the air pipe is connected to the air source, and the other end is connected to diaphragm pump 6, which is connected to the suction pipe in the foundation pit. Diaphragm pump 6 is a pneumatic diaphragm pump, model QYB-10.
[0024] The PLC-based foundation pit drainage device of this invention also includes a host computer, which is connected to the PLC controller.
[0025] Working Principle: Addressing the current problem that maintenance personnel cannot immediately remove accumulated water from the mine's auxiliary shaft operating pit due to time constraints, leading to damage to sensors, electrical leaks, equipment corrosion, and safety hazards during drainage, this invention addresses the requirement for timely drainage when the water level reaches a certain point. The first water level sensor 1 and the second water level sensor 2 are installed at different heights within the pit. For example, the first water level sensor 1 is installed below the second water level sensor 2. The position of the first water level sensor 1 indicates a low water level, the position of the second water level sensor 2 indicates a high water level, and the position between the low and high water levels indicates a medium water level. When the water level exceeds the high water level, drainage is required; when the water level is below the low water level, drainage is unnecessary as the water will not affect the equipment.
[0026] To this end, the first water level sensor 1 is connected to the input port I1.6 of the PLC controller 3, the second water level sensor 2 is connected to the input port I1.7 of the PLC controller 3, the output port Q1.0 of the PLC controller 3 is connected to one end of the relay 4, the other end of the relay 4 is connected to the solenoid valve 5, the solenoid valve 5 is located on the air pipe, one end of the air pipe is connected to the air source, and the other end of the air pipe is connected to the diaphragm pump 6, which is connected to the suction pipe in the pit.
[0027] When the water level in the foundation pit reaches the position of the second water level sensor 2, indicating a high water level, it signifies that the water will affect the equipment and therefore requires drainage. At this time, both the first water level sensor 1 and the second water level sensor 2 are closed. Input ports I1.6 and I1.7 of the PLC controller 3 receive a high level, and output port Q1.0 of the PLC controller 3 outputs a high level. The auxiliary contact of relay 4 is closed, energizing the solenoid valve 5. Air is supplied to the diaphragm pump 6 through the solenoid valve 5. The diaphragm pump 6 is a pneumatic diaphragm pump; once pressurized, it starts pumping water to drain the water from the foundation pit. When the water level is at the middle level, it will not affect the output port Q1.0 of the PLC controller 3, maintaining its original output state. During drainage, when the water level in the pit drops below the low level, both the first water level sensor 1 and the second water level sensor 2 disconnect. At this time, input ports I1.6 and I1.7 of the PLC controller 3 receive a low level, and output port Q1.0 of the PLC controller 3 outputs a low level. The auxiliary contact of relay 4 disconnects, solenoid valve 5 is de-energized, the air supply to the diaphragm pump 6 stops, and the diaphragm pump 6 stops working, thus stopping drainage. The host computer connected to the PLC controller can display the water level in the pit and the operating status of the diaphragm pump by receiving the output status signal, facilitating timely monitoring of the water level in the pit and the operation of the diaphragm pump. This invention achieves the high and low output levels of output port Q1.0 by setting the high and low input levels of the two input ports I1.6 and I1.7 of the PLC controller 3. This control method is the control logic inherent in the S7-300 PLC and is existing technology, not within the protection scope of this invention.
[0028] The PLC-based foundation pit drainage device of this utility model is being used in the auxiliary shaft of the East Shaft of Zhangji Coal Mine, Huainan Mining Group. It is currently performing well and can promptly drain the water accumulated in the foundation pit and display the current water level. This device reduces the labor intensity of employees, eliminates safety hazards when clearing water, and also prevents sensor damage and leakage caused by water accumulation in the foundation pit, avoids equipment corrosion and damage, effectively protects the safety of personnel and equipment in the auxiliary shaft, and makes the hoisting system safer to operate.
[0029] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. A PLC-based foundation pit drainage device, characterized in that: The device includes a first water level sensor (1) and a second water level sensor (2) located at different heights in the foundation pit. The first water level sensor (1) and the second water level sensor (2) are respectively connected to two input ports of the PLC controller (3). The output port of the PLC controller (3) is connected to one end of the coil of the relay (4). The other end of the coil of the relay (4) is connected to the first power supply. One end of the auxiliary contact of the relay (4) is connected to the second power supply. The other end of the auxiliary contact of the relay (4) is connected to one end of the solenoid valve (5). The other end of the solenoid valve (5) is connected to the second power supply. The solenoid valve (5) is located on the air pipe. One end of the air pipe is connected to the air source. The other end of the air pipe is connected to the diaphragm pump (6). The diaphragm pump (6) is connected to the suction pipe in the foundation pit.
2. The PLC-based foundation pit drainage device according to claim 1, characterized in that: The height of the first water level sensor (1) in the foundation pit is less than the height of the second water level sensor (2) in the foundation pit. The position of the first water level sensor (1) in the foundation pit is the low water level, and the position of the second water level sensor (2) in the foundation pit is the high water level. The position between the low water level and the high water level is the middle water level.
3. The PLC-based foundation pit drainage device according to claim 2, characterized in that: The model of the PLC controller (3) is S7-300. One end of the first water level sensor (1) and the second water level sensor (2) are respectively connected to the first power supply. The other end of the first water level sensor (1) is connected to the input port I1.6 of the PLC controller (3), and the other end of the second water level sensor (2) is connected to the input port I1.7 of the PLC controller (3).
4. The PLC-based foundation pit drainage device according to claim 3, characterized in that: The relay (4) is model RH2B-UL, and the output port Q1.0 of the PLC controller (3) is connected to one end of the coil of the relay (4).
5. The PLC-based foundation pit drainage device according to claim 3, characterized in that: The first water level sensor (1) and the second water level sensor (2) are DPPI type float level switches.
6. The PLC-based foundation pit drainage device according to claim 3, characterized in that: The solenoid valve (5) is a pneumatic solenoid valve, model number 2V025-08.
7. The PLC-based foundation pit drainage device according to claim 3, characterized in that: The diaphragm pump (6) is a pneumatic diaphragm pump, model QYB-10.
8. The PLC-based foundation pit drainage device according to claim 1, characterized in that: The device also includes a host computer, which is connected to the PLC controller.
9. The PLC-based foundation pit drainage device according to claim 3, characterized in that: The first power supply is a 24V power supply. One end of the first water level sensor (1) and the second water level sensor (2) are respectively connected to the positive terminal of the first power supply, and the other end of the relay (4) coil is connected to the negative terminal of the first power supply.
10. The PLC-based foundation pit drainage device according to claim 1, characterized in that: The second power supply is a 12V power supply. One end of the auxiliary contact of the relay (4) is connected to the positive terminal of the second power supply, and the other end of the solenoid valve (5) is connected to the negative terminal of the second power supply.