Automatic drainage device for water sump of coal mining roadway

Abstract

The utility model relates to the technical field of coal mine production, in particular to an automatic drainage device for a coal mine excavation roadway water sump, and aims to solve the problems that in the existing coal mine water sump accumulated water drainage process, a submersible pump is generally controlled manually to drain water; usually, operators cannot automatically control the water pump to drain water according to the water level of the water sump, and finally the overall water drainage efficiency of the water sump is low. According to the device, an annular wood block serves as a buoy and ascends along with the liquid level of a water sump to drive a magnet to approach an upper magnetic reed switch, a reed pipe senses a magnetic field to enable a reed to be attracted and control a first switch to be electrified and attracted, an alternating-current relay is electrified and attracted and control a third switch to be attracted, and then a PLC controls a submersible pump to drain accumulated water in the water sump. When the liquid level in the water sump descends to the position close to the lower magnetic reed switch, the second switch is powered on, the control system is powered off due to normally-closed disconnection of the second switch, the water pump is stopped, drainage is finished, and the automation level of water sump drainage is effectively improved in the whole process.

Description

Technical Field

[0001] The utility model relates to the technical field of coal mine production, in particular to an automatic drainage device for a water sump in a coal mine excavation roadway. Background Art

[0002] Due to the accumulation of water gushing and dripping in the driving face and the return airway in the coal mine, as well as various water pipe drips, a large amount of water often accumulates in the roadway water sump. Coupled with inadequate supervision, the phenomenon of water accumulation in the roadway is serious, which greatly deteriorates the underground working environment, is not conducive to creating a standardized production, and is extremely likely to cause corrosion to production metal equipment, steel rails, metal supports, etc., seriously shortening the service life of production equipment. At present, the commonly used drainage method in the coal mine underground roadway is to place a submersible pump in the water sump, and the start and stop of the pump are both completed by manual operation. Therefore, it does not have the function of automatically starting and stopping the pump according to the water level in the water sump and remotely controlling the start and stop of the pump for drainage, significantly reducing the overall drainage efficiency of the mine water sump. Content of the Utility Model

[0003] The utility model provides an automatic drainage device for a water sump in a coal mine excavation roadway to solve the problems existing in the above background.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] An automatic drainage device for a water sump in a coal mine excavation roadway includes a water sump. A liquid level sensor is vertically and fixedly arranged inside the water sump. An annular wooden block is movably sleeved on the liquid level sensor. A submersible pump is also fixedly arranged inside the water sump. The submersible pump is connected with a drain pipe, and both the liquid level sensor and the submersible pump are connected to a PLC controller.

[0006] Further, a top magnetic reed switch is fixedly connected to the top of the liquid level sensor, and a bottom magnetic reed switch is fixedly connected to the bottom of the liquid level sensor. The top magnetic reed switch is connected with a first switch, and the bottom magnetic reed switch is connected with a second switch.

[0007] Further, an annular magnet is arranged on the liquid level sensor between the top magnetic reed switch and the bottom magnetic reed switch, and the annular wooden block and the annular magnet are fixedly connected.

[0008] Further, both the top magnetic reed switch and the bottom magnetic reed switch are connected to an AC relay. The AC relay is connected with a third switch, and the AC relay and the third switch are also connected to the PLC controller.

[0009] Further, a low-voltage explosion-proof switch is fixedly arranged at the roadway floor of the water sump. The low-voltage explosion-proof switch is connected to the submersible pump through a load wire, and the low-voltage explosion-proof switch is also connected to the PLC controller.

[0010] The utility model has the following beneficial effects:

[0011] An automatic drainage device for a water sump in a coal mine excavation roadway provided by the utility model mainly consists of components such as a reed switch, an annular wooden block, a magnet, a submersible pump, a control switch, and a PLC controller. By using the annular wooden block as a float, when the liquid level in the water sump rises, it drives the magnet to approach the upper reed switch. The reed switch senses the magnetic field and makes the reed pieces attract and control the first switch to be energized and attracted. The AC relay is energized and attracted to control its third switch to be attracted. The normally open contact of the contactor forms self-holding in the system and controls the submersible pump to drain the accumulated water in the water sump through the PLC controller. Even if the liquid level drops, the pump will not stop, improving the drainage stability. When the liquid level in the water sump drops to near the lower reed switch, the second switch is energized, and its normally closed contact disconnects to de-energize the control system, thus ensuring that the pump stops and the drainage ends. The entire process effectively improves the automation level of water sump drainage and solves the problem that in the process of draining the accumulated water in the water sump in a coal mine shaft, due to the generally adopted method of manually controlling the submersible pump for drainage, it usually causes the operators to be unable to automatically control the pump drainage according to the water level in the water sump, ultimately resulting in low overall drainage efficiency of the water sump. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic diagram of the overall structure of the utility model.

[0013] Figure 2 is a schematic diagram of the control circuit of the utility model.

[0014] The meanings of the reference numerals are as follows:

[0015] 1. Water sump; 2. Liquid level sensor; 3. Upper reed switch; 4. Annular magnet; 5. Annular wooden block; 6. Lower reed switch; 7. Submersible pump; 8. Drain pipe; 9. PLC controller; 10. Load wire; 11. Low-voltage explosion-proof switch; 12. Roadway floor; 13. First switch; 14. Second switch; 15. AC relay; 16. Third switch. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The following further describes the utility model with reference to the drawings and specific embodiments.

[0017] As Figure 1-2 shown, an automatic drainage device for a water sump in a coal mine excavation roadway includes a water sump 1. A liquid level sensor 2 is vertically and fixedly arranged inside the water sump 1. An annular wooden block 5 is movably sleeved on the liquid level sensor 2. A submersible pump 7 is also fixedly arranged inside the water sump 1. The submersible pump 7 is connected to a drain pipe 8, and both the liquid level sensor 2 and the submersible pump 7 are connected to a PLC controller 9.

[0018] The top of the liquid level sensor 2 is fixedly connected to the upper magnetic reed switch 3, and the bottom of the liquid level sensor 2 is fixedly connected to the lower magnetic reed switch 6. The upper magnetic reed switch 3 is connected to the first switch 13, and the lower magnetic reed switch 6 is connected to the second switch 14.

[0019] An annular magnet 4 is provided on the liquid level sensor 2 between the upper magnetic reed switch 3 and the lower magnetic reed switch 6, and the annular wooden block 5 and the annular magnet 4 are fixedly connected.

[0020] Both the upper magnetic reed switch 3 and the lower magnetic reed switch 6 are connected to the AC relay 15. The AC relay 15 is connected to the third switch 16, and the AC relay 15 and the third switch 16 are also connected to the PLC controller 9.

[0021] A low-voltage explosion-proof switch 11 is fixedly provided at the roadway floor 12 of the sump 1. The low-voltage explosion-proof switch 11 is connected to the submersible pump 7 through the load line 10, and the low-voltage explosion-proof switch 11 is also connected to the PLC controller 9.

[0022] When the present utility model is specifically applied, when the accumulated water flows into the sump 1, the annular wooden block 5 is used as a buoy and rises with the liquid level in the sump 1, driving the annular magnet 4 close to the upper magnetic reed switch 3. The reed switch of the upper magnetic reed switch 3 senses the magnetic field and makes the reed pieces attract and control the first switch 13 to be energized and attracted. Then, the AC relay 15 is energized and attracted to control its third switch 16 to be attracted. The normally open contact of the contactor forms self-holding in the system and controls the submersible pump 7 to drain the accumulated water in the sump 1 through the PLC controller 9, so that the submersible pump 7 will not stop even if the liquid level drops, thereby improving the stability of drainage; when the liquid level in the sump 1 drops to near the lower magnetic reed switch 6, the second switch 14 is energized, and its normally closed contact is disconnected to de-energize the control system, thereby ensuring that the submersible pump 7 stops and the drainage ends. The entire process effectively improves the automation level of the drainage of the sump 1 and solves the problem that in the process of draining the accumulated water in the sump 1 in the coal mine shaft at present, since the submersible pump 7 is generally manually controlled for drainage, the operators usually cannot automatically control the submersible pump 7 for drainage according to the water level in the sump, resulting in low overall drainage efficiency of the sump 1. Therefore, the device has good practicability.

Claims

1. An automatic drainage device for a water tank in a coal mining tunnel, comprising a water tank (1), characterized in that: A liquid level sensor (2) is vertically fixedly provided inside the water tank (1), a circular wooden block (5) is movably sleeved on the liquid level sensor (2), a submersible pump (7) is also fixedly provided inside the water tank (1), the submersible pump (7) is connected to a drainage pipe (8), and the liquid level sensor (2) and the submersible pump (7) are both connected to a PLC controller (9).

2. The automatic drainage device for water tank in coal mining tunnel according to claim 1 is characterized by: The top of the liquid level sensor (2) is fixedly connected to an upper magnetic reed switch (3), the bottom of the liquid level sensor (2) is fixedly connected to a lower magnetic reed switch (6), the upper magnetic reed switch (3) is connected to a first switch (13), and the lower magnetic reed switch (6) is connected to a second switch (14).

3. The automatic drainage device for water tank in coal mining tunnel according to claim 2 is characterized by: An annular magnet (4) is provided on the liquid level sensor (2) located between the upper reed switch (3) and the lower reed switch (6), and the annular wooden block (5) and the annular magnet (4) are fixedly connected.

4. The automatic drainage device for water tank in coal mining tunnel according to claim 3 is characterized by: The upper reed switch (3) and the lower reed switch (6) are both connected to an AC relay (15), the AC relay (15) is connected to a third switch (16), and the AC relay (15) and the third switch (16) are also connected to the PLC controller (9).

5. The automatic drainage device for water tank in coal mining tunnel according to claim 1 is characterized by: A low-pressure flameproof switch (11) is fixedly provided on the tunnel floor (12) of the water tank (1), the low-pressure flameproof switch (11) is connected to the submersible pump (7) via a load line (10), and the low-pressure flameproof switch (11) is also connected to the PLC controller (9).

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