Hole opening sealing mechanism for coal seam drilling
By designing the casing and expansion ring structure, the problem of gaps caused by vibration in the coal seam borehole sealing device was solved, achieving a highly efficient and stable sealing effect and improving the reliability of borehole sealing and the efficiency of installation and disassembly.
Patent Information
- Application Number
- CN202520256982.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-18
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2035-02-18
AI Technical Summary
Existing coal seam borehole sealing devices are prone to gaps due to vibration during the drilling process, resulting in poor sealing. Furthermore, the cement curing time is long, which affects the efficiency of gas extraction.
The system employs a casing, rubber plug, and expansion ring structure. After the rubber plug is inserted into the end of the borehole, the expansion ring is inserted into the gap between the casing and the rubber plug. The expansion ring compresses the rubber plug to make it expand radially, tightly fitting the inner wall of the borehole to achieve a highly efficient seal.
It improves the stability and efficiency of borehole sealing, reduces the difficulty of installation and disassembly, and enhances the reliability of borehole sealing.
Smart Images
Figure CN223724562U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of sealing device, specifically, relate to a hole sealing mechanism of coal seam drilling. BACKGROUND
[0002] Coal seam drilling refers to drilling at relevant positions in coal seams, passing through the drilling to open up a gas extraction channel, and then extracting gas through the drilling. However, during the drilling process or the extraction process, a jetting phenomenon may occur, i.e., sudden high-pressure gas is ejected from the drilling and carries a large amount of coal powder, which not only pollutes the roadway but also affects gas extraction.
[0003] Therefore, it is usually necessary to seal the surroundings of the drilling to prevent gas from overflowing from the drilling wall. A common sealing method is to inject cement between the hole and the pipeline (extraction pipe, drill rod, etc.), which seals the hole with cement. However, the hole itself is a relatively loose structure, and vibrations generated during drilling or extraction can cause the seal to be unstable. In addition, the cement itself needs a certain amount of time to solidify, and during this process, if it moves, it is easy to produce gaps. Therefore, a more stable and efficient sealing device needs to be designed. SUMMARY
[0004] The utility model discloses a hole sealing mechanism of coal seam drilling, which can efficiently and stably seal the hole of the drilling.
[0005] The utility model discloses a hole sealing mechanism of coal seam drilling, which can efficiently and stably seal the hole of the drilling.
[0006] Further, the diameter of one end of the rubber plug close to the drill rod head is greater than the diameter of the other end.
[0007] Further, the outer diameter of one end of the expansion ring close to the rubber plug is greater than the outer diameter of the other end.
[0008] Further, one end of the expansion ring away from the rubber plug is provided with a pressing plate, one end of the pressing plate away from the expansion ring is provided with a sleeve, and a spring is arranged between the pressing plate and the sleeve; the sleeve is threadedly connected with the outer wall of the sleeve.
[0009] Further, the pressing plate is provided with a ring-shaped clamping groove near one end of the expansion ring, and the expansion ring is provided with a ring-shaped clamping ring near one side of the pressing plate, and the clamping ring is clamped in the clamping groove.
[0010] Further, the clamping ring is threadedly connected with the clamping groove.
[0011] Further, the expansion ring comprises a semicircular first expansion ring and a semicircular second expansion ring, the clamping ring comprises a semicircular first clamping ring and a semicircular second clamping ring, the first clamping ring is arranged on the first expansion ring, and the second clamping ring is arranged on the second expansion ring.
[0012] Further, the sleeve is provided with a ring-shaped limiting groove near one end of the spring, and the spring is arranged in the limiting groove.
[0013] The coal seam drilling hole sealing mechanism has the advantages that when in use, the sleeve is inserted into the drilling hole, the rubber plug is inserted into the end of the drilling hole, after the rubber plug is tightly inserted, the expansion ring is inserted into the gap between the rubber plug and the sleeve, the rubber plug can be further squeezed by the insertion of the expansion ring, the rubber plug is radially expanded, and the rubber plug is more closely attached to the inner wall of the drilling hole, so that more efficient and stable sealing is realized. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 The coal seam drilling hole sealing mechanism provided by the embodiment of the utility model has the advantages that the sleeve is inserted into the drilling hole, the rubber plug is inserted into the end of the drilling hole, after the rubber plug is tightly inserted, the expansion ring is inserted into the gap between the rubber plug and the sleeve, the rubber plug can be further squeezed by the insertion of the expansion ring, the rubber plug is radially expanded, and the rubber plug is more closely attached to the inner wall of the drilling hole, so that more efficient and stable sealing is realized.
[0015] Figure 2 The coal seam drilling hole sealing mechanism provided by the embodiment of the utility model has the advantages that the sleeve is inserted into the drilling hole, the rubber plug is inserted into the end of the drilling hole, after the rubber plug is tightly inserted, the expansion ring is inserted into the gap between the rubber plug and the sleeve, the rubber plug can be further squeezed by the insertion of the expansion ring, the rubber plug is radially expanded, and the rubber plug is more closely attached to the inner wall of the drilling hole, so that more efficient and stable sealing is realized.
[0016] Figure 3 The coal seam drilling hole sealing mechanism provided by the embodiment of the utility model has the advantages that the sleeve is inserted into the drilling hole, the rubber plug is inserted into the end of the drilling hole, after the rubber plug is tightly inserted, the expansion ring is inserted into the gap between the rubber plug and the sleeve, the rubber plug can be further squeezed by the insertion of the expansion ring, the rubber plug is radially expanded, and the rubber plug is more closely attached to the inner wall of the drilling hole, so that more efficient and stable sealing is realized.
[0017] Figure 4 The coal seam drilling hole sealing mechanism provided by the embodiment of the utility model has the advantages that the sleeve is inserted into the drilling hole, the rubber plug is inserted into the end of the drilling hole, after the rubber plug is tightly inserted, the expansion ring is inserted into the gap between the rubber plug and the sleeve, the rubber plug can be further squeezed by the insertion of the expansion ring, the rubber plug is radially expanded, and the rubber plug is more closely attached to the inner wall of the drilling hole, so that more efficient and stable sealing is realized.
[0018] Figure 5 The coal seam drilling hole sealing mechanism provided by the embodiment of the utility model has the advantages that the sleeve is inserted into the drilling hole, the rubber plug is inserted into the end of the drilling hole, after the rubber plug is tightly inserted, the expansion ring is inserted into the gap between the rubber plug and the sleeve, the rubber plug can be further squeezed by the insertion of the expansion ring, the rubber plug is radially expanded, and the rubber plug is more closely attached to the inner wall of the drilling hole, so that more efficient and stable sealing is realized.
[0019] Figure 6 The coal seam drilling hole sealing mechanism provided by the embodiment of the utility model has the advantages that the sleeve is inserted into the drilling hole, the rubber plug is inserted into the end of the drilling hole, after the rubber plug is tightly inserted, the expansion ring is inserted into the gap between the rubber plug and the sleeve, the rubber plug can be further squeezed by the insertion of the expansion ring, the rubber plug is radially expanded, and the rubber plug is more closely attached to the inner wall of the drilling hole, so that more efficient and stable sealing is realized.
[0020] Reference signs: 11 - sleeve, 12 - drill rod, 21 - rubber plug, 22 - expansion ring, 221 - first expansion, 222 - second expansion, 23 - snap ring, 231 - first snap ring, 232 - second snap ring, 24 - pressure plate, 25 - snap groove, 26 - sleeve, 27 - spring. DETAILED DESCRIPTION
[0021] The specific embodiments are described below with reference to the accompanying drawings. As shown in the accompanying drawings Figure 1 - accompanying Figure 6 The hole sealing mechanism of the coal seam drilling of the embodiment includes a drill rod 12, a sleeve 11 sleeved on the outer wall of the drill rod 12, a rubber plug 21 sleeved on the outer wall of the sleeve 11, and an expansion ring 22 sleeved on the outer wall of the sleeve 11. An expansion gap is arranged between the end of the rubber plug 21 away from the head of the drill rod 12 and the outer wall of the sleeve 11, and the expansion ring 22 is clamped in the expansion gap. The thickness of the expansion ring 22 is greater than the thickness of the expansion gap. Specifically, in use, the sleeve 11 is inserted into the drill hole, the rubber plug 21 is inserted into the end of the drill hole, and after the rubber plug 21 is tightly inserted, the expansion ring 22 is inserted into the gap between the rubber plug 21 and the sleeve 11. By inserting the expansion ring 22, the rubber plug 21 can be further squeezed, so that the rubber plug 21 expands radially, and then more tightly adheres to the inner wall of the drill hole, achieving more efficient and stable sealing. After the drilling is completed, the expansion ring 22 is removed first, and then the rubber plug 21 and the sleeve 11 can be removed more easily, which can improve the installation and disassembly efficiency.
[0022] The diameter of the rubber plug 21 in the embodiment near the end of the drill rod 12 is greater than the diameter of the other end. Specifically, with the insertion of the rubber plug 21, the drill hole can be better sealed, and the drill hole within a certain diameter range can be sealed.
[0023] The outer diameter of the expansion ring 22 in the embodiment near the end of the rubber plug 21 is greater than the outer diameter of the other end. Specifically, the greater the expansion ring 22 enters the rubber plug 21, the greater the degree of radial expansion of the rubber plug 21.
[0024] The end of the expansion ring 22 in the embodiment away from the rubber plug 21 is provided with a pressure plate 24, the end of the pressure plate 24 away from the expansion ring 22 is provided with a sleeve 26, and the spring 27 is arranged between the pressure plate 24 and the sleeve 26. The sleeve 26 is threadedly connected with the outer wall of the sleeve 11. Specifically, by screwing the sleeve 11, the expansion ring 22 can be squeezed by the spring 27 and the pressure plate 24, which can better press it into the rubber plug 21 and continuously squeeze the expansion ring 22 to prevent it from coming out of the rubber plug 21.
[0025] The pressing plate 24 in the embodiment is provided with an annular clamping groove 25 near one end of the expansion ring 22, the expansion ring 22 is provided with an annular clamping ring 23 near one side of the pressing plate 24, and the clamping ring 23 is clamped in the clamping groove 25. The clamping ring 23 is threadedly connected with the clamping groove 25. The expansion ring 22 comprises a semicircular first expansion ring 221 and a semicircular second expansion ring 222; the clamping ring 23 comprises a semicircular first clamping ring 231 and a semicircular second clamping ring 232; the first clamping ring 231 is arranged on the first expansion ring 221, and the second clamping ring 232 is arranged on the second expansion ring. Specifically, the expansion ring 22 is arranged in a split structure, so that a suitable expansion ring 22 can be replaced according to the actual hole diameter of the drilling hole, and only the first expansion ring 221 and the second expansion ring 222 need to be clamped on the side wall of the sleeve 11 and combined, without the need to sleeve the expansion ring 22 from the end of the sleeve 11.
[0026] The sleeve 26 in the embodiment is provided with an annular limiting groove near one end of the spring 27, and the spring 27 is arranged in the limiting groove.
[0027] In summary, the hole sealing mechanism for the coal seam drilling hole in the embodiment is used by inserting the sleeve 11 into the drilling hole, inserting the rubber plug 21 into the end of the drilling hole, inserting the expansion ring 22 into the gap between the rubber plug 21 and the sleeve 11 after the rubber plug 21 is tightly inserted, and further pressing the rubber plug 21 by inserting the expansion ring 22, so that the rubber plug 21 is radially expanded, and then more tightly adheres to the inner wall of the drilling hole, achieving more efficient and stable sealing. After the drilling is completed, the expansion ring 22 is removed, and then the rubber plug 21 and the sleeve 11 can be removed more easily, which can improve the installation and disassembly efficiency.
Claims
1. A borehole mouth sealing mechanism for a coal seam borehole comprising a drill string, a casing sleeve fitted over the outer wall of the drill string, characterised in that: The rubber plug is sleeved on the outer wall of the sleeve pipe, and the expansion ring is sleeved on the outer wall of the sleeve pipe. An expansion gap is arranged between the rubber plug and the outer wall of the sleeve pipe, and the expansion ring is arranged in the expansion gap.
2. A borehole mouth sealing mechanism for a coal seam borehole according to claim 1, characterised in that: The diameter of the rubber plug close to the one end of the drill pipe head is larger than the diameter of the other end.
3. The borehole mouth sealing mechanism for coal seams as claimed in claim 1 wherein: The outer diameter of the expansion ring close to the rubber plug is larger than the outer diameter of the other end.
4. The borehole mouth sealing mechanism for coal seams as claimed in claim 1 wherein: The one end of the expansion ring away from the rubber plug is provided with a pressing plate, the one end of the pressing plate away from the expansion ring is provided with a sleeve, and the pressing plate and the sleeve are provided with a spring.
5. A borehole mouth sealing mechanism for a coal seam borehole according to claim 4, characterised in that: The one end of the pressing plate close to the expansion ring is provided with an annular clamping groove, and the side of the expansion ring close to the pressing plate is provided with an annular clamping ring.
6. A borehole mouth sealing mechanism for a coal seam borehole according to claim 5, characterised in that: The clamping ring and the clamping groove are threadedly connected.
7. The borehole mouth sealing mechanism for coal seams as claimed in claim 5 wherein: The expansion ring includes a semicircular first expansion ring and a semicircular second expansion ring, the clamping ring includes a semicircular first clamping ring and a semicircular second clamping ring, the first clamping ring is arranged on the first expansion ring, and the second clamping ring is arranged on the second expansion ring.
8. The borehole mouth sealing mechanism of claim 4, wherein: The one end of the sleeve close to the spring is provided with an annular limiting groove, and the spring is arranged in the limiting groove.