Anti-blocking and anti-smashing orifice protection device for coal mine gas extraction drilling

Abstract

The invention relates to the technical field of coal mine underground gas control, in particular to an anti-blocking and anti-smashing orifice protection device for coal mine gas extraction drilling. The technical problems that in the prior art, when exposed drill holes are blocked, temporary measures are usually adopted, the effect is poor, the drill holes are prone to being lost, and the drill holes need to be cleaned one by one before networking extraction, and time and labor are wasted are solved. According to the technical scheme, the anti-blocking and anti-smashing orifice protection device for the coal mine gas extraction drill hole comprises a fixed base which is inserted into and fixed to a drill hole orifice; the anti-blocking cap is configured to detachably cover the outer end opening of the fixed base so as to seal the hole opening; two ends of the connecting chain are respectively connected with the fixed base and the anti-blocking cap; effective protection of the orifice is achieved through a pure mechanical structure, complex tools are not needed in the whole using process, operation is easy and convenient, the device is simple in structure and low in cost and can adapt to the severe environment of an underground coal mine, and the reliability and efficiency of orifice protection are improved.

Description

Technical Field

[0001] This invention relates to the field of underground gas control technology in coal mines, and in particular to a protective device for preventing blockage and smashing of gas extraction boreholes in coal mines. Background Technology

[0002] In underground gas drainage operations in coal mines, a large number of drainage boreholes need to be drilled in the coal face first. After the boreholes are drilled, drainage pipes are inserted and the boreholes are sealed. However, there is a time interval (i.e., the "gap period") between the end of the sealing and the connection of the drainage pipeline network for drainage. During this period, the exposed borehole openings face two major problems: First, broken coal and gangue from the roof and coal face of the roadway are prone to fall into the boreholes due to equipment operation or mine pressure, causing blockage. Second, the openings of the drainage pipes at the borehole openings are easily damaged by falling rocks or by collisions with equipment and materials moving in the roadway.

[0003] Currently, there is no specific solution to this problem. Workers usually use temporary measures, such as stuffing the openings with cotton yarn, rags and other debris. However, these methods are ineffective, easy to lose, and need to be cleaned one by one before network sampling, which is time-consuming and laborious and cannot fundamentally solve the problem.

[0004] Therefore, in response to the above problems, a hole-blocking and anti-collision protection device for coal mine gas drainage boreholes is proposed. It achieves effective protection of the hole opening through a purely mechanical structure. The entire process requires no complicated tools, is easy to operate, and the device has a simple structure and low cost. It can adapt to the harsh environment of underground coal mines and improve the reliability and efficiency of hole opening protection. Summary of the Invention

[0005] To overcome the limitations of existing technologies in sealing exposed boreholes, workers typically employ temporary measures, such as plugging the boreholes with cotton yarn, rags, or other debris. However, these methods are ineffective, prone to loss, and require individual cleaning before network sampling, which is time-consuming and labor-intensive.

[0006] The technical solution of this invention is: a hole-blocking and anti-collision protection device for coal mine gas drainage boreholes, comprising: A mounting base is configured to be inserted into and fixed to the drill hole opening; An anti-clogging cap is configured to detachably cover the outer end port of the fixed base to seal the orifice; The connecting chain connects the fixed base and the anti-blocking cap at both ends.

[0007] Preferably, during the sealing operation, the fixing base is inserted into the borehole opening and fixed with sealing material; then the anti-blocking cap is attached to the fixing base by thread or snap connection to form a physical seal; the two are connected by a connecting chain to prevent parts from being lost; before extraction, only the anti-blocking cap needs to be removed to expose the regular opening for connecting to the extraction pipeline network.

[0008] Preferably, the fixing base is a short tubular structure with a flange at one end; the flange can prevent the fixing base from sliding completely into the drill hole, ensuring that the base is stably fixed at the hole opening position. The short tubular structure is easy to insert into the drill hole and is firmly bonded to the hole wall by sealing agent or quick-drying cement to form a stable base.

[0009] Preferably, the anti-blocking cap is a solid structure with an external hemispherical or conical shape; the hemispherical or conical structure allows falling objects to slide down the slope, avoiding the accumulation of debris, while the solid structure provides sufficient strength and impact resistance to effectively prevent coal or gangue from damaging the orifice.

[0010] Preferably, the anti-clogging cap is detachably connected to the outer end port of the fixed base via a threaded connection or a snap-fit ​​connection; the threaded connection ensures a tight seal, while the snap-fit ​​connection facilitates quick installation and removal. Both methods can achieve a reliable physical seal and prevent foreign objects from entering.

[0011] Preferably, the connecting chain is a metal chain or a high-strength corrosion-resistant rope; the metal chain has high strength and durability and is suitable for harsh underground environments; the high-strength corrosion-resistant rope is lightweight and corrosion-resistant, and can be selected according to actual needs. The function of the connecting chain is to prevent the anti-blocking cap from being lost and to facilitate suspension during operation.

[0012] Preferably, the flange of the fixed base is configured to prevent the fixed base from sliding completely into the drill hole; the flange acts as a stop structure to ensure that the base does not go too deep after being inserted into the drill hole, thereby maintaining the connectability of the outer end port and facilitating the closing of the anti-clogging cap and the connection of the extraction tube.

[0013] Preferably, the anti-blocking cap is made of metal material; metal material has high hardness and impact resistance, can withstand the impact of falling rocks in the well, and extend the service life of the device.

[0014] Preferably, the inner side of the anti-clogging cap is provided with an internal thread, and the outer end port of the fixed base is provided with an external thread, and the internal thread matches the external thread; the threaded engagement provides a stable connection and seal, and the anti-clogging cap can be tightened or loosened by rotation, which is simple to operate and highly reliable.

[0015] Preferably, one end of the connecting chain is fixed to the flange of the fixed base, and the other end is fixed to the anti-clogging cap; thus ensuring that the anti-clogging cap will not fall off the device after disassembly, avoiding loss, and facilitating temporary hanging of the anti-clogging cap when connecting the extraction tube.

[0016] Preferably, the connecting chain is fixed to the fixed base and the anti-clogging cap by welding; welding provides a strong connection that is not easy to fall off, adapts to downhole vibration and impact environments, and ensures the long-term reliability of the device.

[0017] The beneficial effects of this invention are: During borehole sealing operations, this invention involves inserting a fixed base into the borehole opening and securing it with sealing material. Then, an anti-blocking cap is attached to the fixed base via threads or snap-fit ​​connections, forming a physical seal. A connecting chain links the two to prevent parts loss. Before extraction, simply removing the anti-blocking cap exposes the well-formed borehole for connection to the extraction pipeline. Thus, effective borehole protection is achieved through a purely mechanical structure. The entire process requires no complex tools, is easy to operate, and the device is simple in structure and low in cost. It can adapt to the harsh environment of underground coal mines, improving the reliability and efficiency of borehole protection. Attached Figure Description

[0018] Figure 1 The diagram shown is a first three-dimensional structural schematic of the anti-blocking and anti-smashing hole protection device for coal mine gas extraction boreholes according to the present invention. Figure 2 The diagram shown is a second three-dimensional structural schematic of the anti-blocking and anti-smashing hole protection device for coal mine gas extraction boreholes according to the present invention. Figure 3 The diagram shown is a partial structural diagram of the anti-blocking and anti-smashing borehole protection device for coal mine gas drainage boreholes according to the present invention. Figure 4 The diagram shown is a partial structural diagram of the anti-blocking and anti-smashing hole protection device for coal mine gas drainage boreholes according to the present invention. Explanation of reference numerals in the attached diagram: 1. Fixed base; 2. Anti-clogging cap; 3. Connecting chain; 11. Flange. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Example 1 Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 This invention provides an embodiment: a hole-blocking and anti-collision protection device for coal mine gas drainage boreholes, comprising: Fixed base 1, configured to be inserted into and fixed to the drill hole opening; The anti-blocking cap 2 is configured to detachably cover the outer end port of the fixed base 1 to seal the orifice; Connecting chain 3, with fixed base 1 and anti-blocking cap 2 connected to both ends respectively.

[0021] During the sealing operation, the fixed base 1 is inserted into the borehole and fixed with sealing material; then the anti-blocking cap 2 is attached to the fixed base 1 by thread or snap connection to form a physical seal; the two are connected by the connecting chain 3 to prevent parts from being lost; before extraction, the anti-blocking cap 2 can be removed to expose the regular opening for connection to the extraction pipeline.

[0022] Furthermore, the fixed base 1 is a short tubular structure with a flange 11 at one end; the flange 11 can prevent the fixed base 1 from sliding completely into the drill hole, ensuring that the base is stably fixed at the hole opening position. The short tubular structure is easy to insert into the drill hole and is firmly bonded to the hole wall by sealing agent or quick-drying cement to form a stable base.

[0023] Furthermore, the anti-blocking cap 2 is a solid structure with an external shape that is hemispherical or conical; the hemispherical or conical structure allows falling objects to slide down the slope, avoiding the accumulation of debris, while the solid structure provides sufficient strength and impact resistance to effectively prevent coal or gangue from damaging the orifice.

[0024] Furthermore, the anti-blocking cap 2 is detachably connected to the outer end port of the fixed base 1 via a threaded connection or a snap-fit ​​connection; the threaded connection ensures a tight seal, while the snap-fit ​​connection facilitates quick installation and removal. Both methods can achieve a reliable physical seal and prevent foreign objects from entering.

[0025] Furthermore, the connecting chain 3 is a metal chain or a high-strength corrosion-resistant rope; the metal chain has high strength and durability and is suitable for harsh underground environments; the high-strength corrosion-resistant rope is lightweight and corrosion-resistant, and can be selected according to actual needs. The function of the connecting chain 3 is to prevent the anti-blocking cap 2 from being lost and to facilitate suspension during operation.

[0026] Furthermore, the flange 11 of the fixed base 1 is configured to prevent the fixed base 1 from sliding completely into the drill hole; the flange 11 serves as a stop structure to ensure that the base does not go too deep after being inserted into the drill hole, thereby maintaining the connectability of the outer end port and facilitating the closing of the anti-blocking cap 2 and the connection of the extraction tube.

[0027] Furthermore, the anti-blocking cap 2 is made of metal; metal has high hardness and impact resistance, and can withstand the impact of falling rocks downhole, extending the service life of the device.

[0028] Furthermore, the inner side of the anti-blocking cap 2 is provided with an internal thread, and the outer end of the fixed base 1 is provided with an external thread. The internal thread and the external thread are matched. The threaded engagement provides a stable connection and seal. The anti-blocking cap 2 can be tightened or loosened by rotation. The operation is simple and highly reliable.

[0029] Furthermore, one end of the connecting chain 3 is fixed to the flange 11 of the fixed base 1, and the other end is fixed to the anti-blocking cap 2; thus ensuring that the anti-blocking cap 2 will not fall off the device after disassembly, avoiding loss, and facilitating temporary hanging of the anti-blocking cap 2 when connecting the extraction tube.

[0030] Furthermore, the connecting chain 3 is fixed to the fixed base 1 and the anti-blocking cap 2 by welding; welding provides a strong connection that is not easy to fall off, adapts to downhole vibration and impact environments, and ensures the long-term reliability of the device.

[0031] Through the above steps, during the sealing operation, the fixed base 1 is inserted into the borehole opening and fixed with sealing material; then the anti-blocking cap 2 is connected to the fixed base 1 by threads or snaps to form a physical seal; the two are connected by the connecting chain 3 to prevent parts from being lost; before extraction, only the anti-blocking cap 2 needs to be removed to expose the regular opening for connecting to the extraction pipeline network; thus, the orifice is effectively protected through a purely mechanical structure. The entire process requires no complicated tools, is easy to operate, and the device has a simple structure and low cost, which can adapt to the harsh environment of underground coal mines and improve the reliability and efficiency of orifice protection.

[0032] Example 2 Optionally, the present invention provides another embodiment, which provides a hole-blocking and anti-smashing protection device for coal mine gas drainage boreholes; the device includes a fixed base 1, an anti-blocking cap 2, and a connecting chain 3; the fixed base 1 is a short tubular structure with a flange 11 at one end, made of steel, with an outer diameter slightly smaller than the diameter of the borehole (for example, when the borehole diameter is 50mm, the outer diameter of the fixed base 1 can be 45mm), and a length of 50-100mm; the outer diameter of the flange 11 is larger than the borehole diameter to prevent the fixed base 1 from completely sliding into the borehole; The fixed base 1 is inserted into the borehole opening to a depth of about 5-10cm and is fixed to the coal wall and extraction pipe with a sealing agent (such as quick-drying cement); the anti-blocking cap 2 is a solid structure with an external hemispherical shape, made of cast steel, with internal threads machined on its inner side, which match the external threads of the outer end of the fixed base 1. It is detachably covered on the fixed base 1 by means of threaded connection to achieve physical sealing; the connecting chain 3 is a stainless steel metal chain with a length of 100-200mm, and its two ends are respectively welded to the flange 11 of the fixed base 1 and the anti-blocking cap 2.

[0033] During installation, during the sealing process, the fixing base 1 is inserted into the borehole and fixed with a sealing agent; then, the anti-blocking cap 2 is tightened onto the fixing base 1 to ensure a seal; the connecting chain 3 hangs naturally to prevent the anti-blocking cap 2 from being lost; when it is necessary to connect to the extraction pipeline, the anti-blocking cap 2 is unscrewed by hand and hung aside by the connecting chain 3, which exposes the inner hole of the fixing base 1 for connecting the extraction branch pipe.

[0034] Example 3 Optionally, the present invention provides another embodiment, which further provides a more detailed and optimized implementation method based on embodiment 2.

[0035] The flange 11 of the fixed base 1 is specifically designed as an annular protrusion, with an outer diameter 10-20mm larger than the borehole diameter (for example, when the borehole diameter is 50mm, the outer diameter of the flange 11 is 60mm), effectively preventing the fixed base 1 from completely sliding into the borehole when inserted or subjected to external force; the anti-blocking cap 2 is made of cast steel, with an external conical shape and a cone angle of 60-90 degrees. This design allows falling objects (such as coal blocks and gangue) to slide down the slope, avoiding accumulation; the internal thread on the inner side of the anti-blocking cap 2 and the external thread on the outer end of the fixed base 1 adopt standard thread specifications (such as M40×1.5) to ensure a tight fit; the connecting chain 3 is a high-strength stainless steel chain with a chain link diameter of 3-5mm. One end of the chain is fixed to the side of the flange 11 of the fixed base 1 by arc welding, and the other end is welded to the top of the anti-blocking cap 2 in the same way. The welding strength must meet the requirements of the downhole vibration environment.

[0036] During installation, after the fixed base 1 is inserted into the drill hole, it is cured with a sealing agent to form a stable base; when the anti-blocking cap 2 is tightened, the threaded connection provides a sealing pressure of at least 0.5MPa to prevent water and small debris from seeping in; the length of the connecting chain 3 is designed to be 150mm to ensure that the anti-blocking cap 2 can hang naturally after being unscrewed without interfering with the connection of the extraction pipe; this embodiment is particularly suitable for high-gas mines, where the solid cast steel structure of the anti-blocking cap 2 can withstand an impact energy of at least 10J to prevent damage.

[0037] The present invention achieves orifice protection through the above embodiments. Its core principle is to use the fixed base 1 to provide a stable base, the anti-blocking cap 2 to achieve physical isolation, and the connecting chain 3 to prevent the loss of components. During the "window period", the hemispherical or conical structure of the anti-blocking cap 2 guides the falling objects to the surrounding area to avoid direct impact on the orifice. The threaded or snap-fit ​​connection ensures the reliability of the seal. The fixing method of the connecting chain 3 avoids the problem of easy loss of traditional temporary measures. The entire device requires no maintenance and the pure mechanical structure is suitable for the harsh downhole environment.

[0038] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A clogging and tampering prevention orifice protection device for coal mine gas extraction drilling, characterized in that: The utility model relates to a kind of drilling hole sealing device, including: Fixed base (1) is configured to be inserted and fixed in drill hole orifice; Anti-blocking cap (2) is configured to be detachably covered on the outer end port of the fixed base (1) to seal the orifice; Connecting chain (3) is connected with the fixed base (1) and the anti-blocking cap (2) respectively at both ends.

2. The anti-blocking and anti-punching orifice protection device for coal mine gas extraction drilling according to claim 1, characterized in that: The fixed base (1) is a short tubular structure with a flange (11) at one end.

3. The anti-blocking and anti-punching orifice protection device for coal mine gas extraction drilling according to claim 1, characterized in that: The anti-blocking cap (2) is a solid structure with a hemispherical or conical external shape.

4. The anti-blocking and anti-punching orifice protection device for coal mine gas extraction drilling according to claim 1, characterized in that: The anti-blocking cap (2) is detachably covered on the outer end port of the fixed base (1) by threaded connection or buckle connection.

5. The anti-blocking and anti-punching orifice protection device for coal mine gas extraction drilling according to claim 1, characterized in that: The connecting chain (3) is a metal chain or a high-strength corrosion-resistant rope.

6. The anti-blocking and anti-punching orifice protection device for coal mine gas extraction drilling according to claim 2, characterized in that: The flange (11) of the fixed base (1) is configured to prevent the fixed base (1) from sliding completely into the drill hole.

7. The anti-blocking and anti-punching orifice protection device for coal mine gas extraction drilling according to claim 3, characterized in that: The anti-blocking cap (2) is made of metal material.

8. The anti-blocking and anti-punching orifice protection device for coal mine gas extraction drilling according to claim 4, characterized in that: The inner side of the anti-blocking cap (2) is provided with internal threads, and the outer end port of the fixed base (1) is provided with external threads, and the internal threads match the external threads.

9. The anti-blocking and anti-punching orifice protection device for coal mine gas extraction drilling according to claim 5, characterized in that: One end of the connecting chain (3) is fixed to the flange (11) of the fixed base (1), and the other end is fixed to the anti-blocking cap (2).

10. The anti-blocking and anti-punching orifice protection device for coal mine gas extraction drilling according to claim 9, characterized in that: The connecting chain (3) is fixed to the fixed base (1) and the anti-blocking cap (2) by welding.

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