CN103016045B - Mining continuous quantitative secondary hole sealing system - Google Patents

Abstract

The invention discloses a mining continuous quantitative secondary hole sealing system. An air inlet pipeline of the secondary hole sealing system is connected with an inlet of a mechanical timer. An outlet of the mechanical timer is simultaneously connected with branch pipelines I and II. The branch pipeline II is sequentially connected with a pressure regulating valve II, a one-way valve II and a fastening device in series. The fastening device is connected with a pneumatic motor through a high-pressure air pipe. The pneumatic motor is connected with a rotary feeder. The upper end of the rotary feeder is connected with the lower end of a bin of a feeding device, and the lower end of the rotary feeder is connected with the upper end of an acceleration air chamber. The branch pipeline I is sequentially connected with a pressure regulating valve I, a one-way valve I and the acceleration air chamber in series. The secondary hole sealing system is particularly applied to secondary hole sealing for underground gas extraction drilling in a coal mine; powder can be continuously and quantitatively conveyed according to the actual conditions of an underground site of the coal mine, so that the powder hole sealing quality is controlled more effectively. An underground compressed air system is used as power, so that the secondary hole sealing system can be used in the underground site of the coal mine safely and reliably.

Description

Continuous Quantitative Secondary Sealing System for Mine

technical field

The invention relates to a mining powder conveying device, in particular to a secondary hole sealing device for gas drainage drilling.

Background technique

Gas disaster is one of the main disasters in coal mines. One of the fundamental measures to prevent and control gas disasters in coal mines is gas drainage. However, many coal mines in my country are in the late stage of gas drainage. Gas drainage can easily cause spontaneous combustion of coal seams. For this reason, engineers and technicians in this field proposed the "Secondary Sealing Method to Increase the Concentration of Gas Drainage in Coal Seam Boreholes" (ZL200810023609.5), that is, to transport fine expansion powder into the drainage borehole, and the powder is A method for sealing coal and rock fissures in the extraction area under the action of negative pressure to increase the extraction concentration. According to the actual conditions of coal mines, in order to better transport powder into the borehole, engineers and technicians in this field invented "a secondary sealing device for gas drainage boreholes" (ZL200810023608.0). After the device is connected to the underground compressed air system of the coal mine, the powder will be blown back by the air force and its own gravity, and will fall to the mixing chamber to be mixed with the compressed air, and then transported to the gas drainage borehole to seal the coal and rock fissures. However, the device has problems such as discontinuous feeding, large and small feeding volume, and even blockage of the conveying pipeline, which affects the effect of the secondary sealing to a certain extent.

Contents of the invention

In order to overcome the defects of the existing "secondary hole sealing device for gas drainage drilling" that the feeding is discontinuous, the amount of feeding is suddenly large and small, and even the delivery pipeline is blocked, the present invention provides a mining continuous Quantitative secondary sealing system, the continuous quantitative secondary sealing system for mines can continuously feed materials, and the conveying pipeline will not be blocked.

The technical scheme of the present invention is: the continuous quantitative secondary sealing system for mines includes an air intake pipeline, a mechanical timer, a feeding device and a discharge pipeline, the air intake pipeline is connected with the inlet of the mechanical timer, and the mechanical timer The outlet of the valve is connected with the branch pipeline I and the branch pipeline II at the same time. The branch pipeline II is connected in series with the pressure regulating valve II, the check valve II and the fastening device. The fastening device is connected with the air motor through the high-pressure air pipe, and the air motor and the The rotary feeder is connected, the upper end of the rotary feeder is connected with the lower end of the silo of the feeding device, the lower end of the rotary feeder is connected with the upper end of the acceleration chamber, and the I branch pipeline is connected in series with I pressure regulating valve, I A one-way valve and an accelerating air chamber, the outlet of the accelerating air chamber is connected with the discharge pipeline.

The Ⅰ pressure regulating valve, the Ⅰ check valve and the Ⅱ pressure regulating valve, and the Ⅱ check valve respectively control the Ⅰ branch pipeline and the Ⅱ branch pipeline between the mechanical timer and the feeding device. The upper end of the silo is provided with a silo cover, and the upper part of the silo is provided with a safety valve. Flange connections are used between the rotary feeder and the air motor, the silo and the acceleration air chamber. The Ⅱ branch pipeline is connected with the high-pressure gas pipe through a fastening device. The intake pipeline, branch I pipeline, and branch II pipeline are all four-point iron pipes, the high-pressure air pipe is a plastic hose, and the discharge pipeline is a six-point iron pipe; the branch I pipeline and the accelerating air chamber, the accelerating air chamber and the The outlet pipes are all connected with variable diameter threads.

The invention has the advantages that it is especially suitable for secondary sealing of boreholes for gas drainage in coal mines, and can realize continuous and quantitative transportation of powder materials according to the actual conditions of coal mine underground sites, and more effectively control the quality of powder sealing holes. The device uses the underground compressed air system as power, and is safe and reliable when used in coal mines.

Description of drawings

Fig. 1 is a structural schematic diagram of an embodiment of the present invention.

In the figure: 1. Intake pipeline, 2. Mechanical timer, 3.ⅠPressure regulating valve, 4.ⅠCheck valve, 5.ⅡPressure regulating valve, 6.ⅡCheck valve, 7.Feeding device, 7 -1. Hopper cover, 7-2. Hopper, 7-3. Air motor, 7-4. Rotary feeder, 7-5. Acceleration chamber, 8. Fastening device, 9. Ⅱ branch pipeline , 10.Ⅰ branch pipeline, 11. High pressure gas pipe, 12. Discharge pipeline, 13. Safety valve

Detailed ways

The intake pipeline 1 is connected with the inlet of the mechanical timer 2, and the outlet of the mechanical timer 2 is connected with the I branch pipeline 10 and the II branch pipeline 9 at the same time. The II branch pipeline 9 is sequentially connected in series with the II pressure regulating valve 5 , the II check valve 6 and the fastening device 8 . The fastening device 8 is connected to the air motor 7-3 through the high-pressure air pipe 11, and the air motor 7-3 is connected to the rotary feeder 7-4. The upper end of the rotary feeder 7-4 links to each other with the lower end of the feed bin 7-2 of the feeding device 7, and the lower end of the rotary feeder 7-4 links to each other with the upper end of the acceleration chamber 7-5. The I branch pipeline is connected in series with the pressure regulating valve I, the one-way valve I and the acceleration chamber 7-5, and the outlet of the acceleration chamber 7-5 is connected with the discharge pipeline 12.

Rotary feeder 7-4 has four impellers, the speed is constant when the air pressure is constant, and continuous quantitative feeding can be realized. The speed is 6 r/min~20 r/min, and the feeding volume is 8 L/min~30 L/ min. The acceleration chamber 7-5 is a conical curve structure, which can evenly mix the powder supplied by the rotary feeder 7-4 with the airflow in the pipeline within 2s. The gas-solid ratio at the discharge end can be controlled by adjusting the pressure regulating valves on the two branches, and it is between 0.02 and 0.07.

Working process: the underground pressure air pipeline is connected with the air intake pipeline 1, the mechanical timer 2 is turned to set the working time, the II pressure regulating valve 5 and the II check valve 6 are adjusted, and the rotation speed of the air motor 7-3 is controlled. The powder in the silo 7-2 is supplied to the acceleration air chamber 7-5 at a certain speed by the rotary feeder 7-4; adjust the I pressure regulating valve 3 and the I check valve 4, and control the I branch pipeline 10 airflow. This air flow and the powder in the acceleration chamber 7-5 are evenly mixed in the pipeline to reach a certain gas-solid ratio, and the powder is blown into the borehole through the discharge pipeline 12. After the feeding is completed within the set time, the mechanical Timer 2 automatically closes the intake pipe 1 and stops feeding. The required output gas-solid ratio can be adjusted through I pressure regulating valve 3 and I one-way valve 4 or II pressure regulating valve 5 and II one-way valve 6; when I branch through I pressure regulating valve 3 and I one-way valve 4 When the airflow pressure in the pipeline 10 increases and the airflow pressure in the II branch pipeline 9 is kept constant or decreases, the gas-solid ratio in the discharge pipeline 12 will increase; When the gas flow pressure in the II branch pipeline 9 increases and the gas flow pressure in the I branch pipeline 10 remains constant or decreases, the gas-solid ratio in the discharge pipeline 12 will decrease.

Claims (1)

1. a mining continuous and quantitative formula secondary hole sealing system, this is mining, and continuous and quantitative formula secondary hole sealing system comprises air inlet pipeline, mechanical timer, feeding device and discharging pipeline, it is characterized in that: air inlet pipeline is connected with the import of mechanical timer, the outlet of mechanical timer is connected with II branch line with I branch line simultaneously, II branch line sequential series has II pressure regulator valve, II one way valve and fastener, fastener is connected with air motor by high-pressure air pipe, air motor is connected with rotary feeder, the upper end of rotary feeder is connected with the lower end of the feed bin of feeding device, the lower end of rotary feeder is connected with the upper end of accelerating air chamber, I branch line sequential series has I pressure regulator valve, I one way valve and acceleration air chamber, the outlet accelerating air chamber is connected with discharging pipeline.