A new type of plugging device for mine anchor cable

Abstract

The utility model discloses a new type of plugging device of mine anchor cable, including base, the middle part of base is equipped with steel strand channel, the upper end part grouting pipe in steel strand channel, the outer sleeve of grouting pipe is equipped with the plugging pipe, and is equipped with the clearance channel for the slurry through between the outer wall of grouting pipe and the inner wall of plugging pipe, and the upper end part of plugging pipe is provided with the sealing ring outward, the inner wall of sealing ring is equipped with a section of inner recess cavity, and the inner recess cavity and plugging pipe constitute the plugging chamber between, the lower end part of base is equipped with the grouting channel that communicates with steel strand channel, and the upper end part of grouting channel is equipped with one -way channel, and the lower end end portion in steel strand channel is installed with the plugging sealing ring. The utility model has the comprehensive technology of grouting and plugging function, installs with the grouting function together with anchor cable under the condition of not changing the structural property of anchor cable, can reduce cost and has higher economic value, the modelling is exquisite, and the operation process is simplified, and the labor intensity of operating personnel is reduced.

Description

Technical Field

[0001] This utility model relates to the field of coal mine roadway support technology, specifically a new type of mine anchor cable sealing device. It is mainly used for coal mine surrounding rock control, roof support, roadway maintenance, water prevention, and full-length anchoring technology required in special sections of underground roadways (faults, rockbursts, and collapse columns, etc.) to achieve advanced support, reinforced support, and composite support, thereby achieving the purpose of strong support. Background Technology

[0002] With the extension of coal mine service life and the increase in mining depth, years of mining have resulted in complex and interwoven goaf areas, and both new and old roadways are significantly affected by mining activities. Severe deformation of the surrounding rock is prevalent, with roof subsidence and fracturing, sidewall compression, and floor heave being common occurrences. Roadway cross-sections are shrinking, impacting normal production and transportation. The shortcomings of traditional support structures are becoming increasingly apparent; they are unable to resist the deformation and damage of the surrounding rock and cannot provide long-term stable support. Problems such as roof collapse, sidewall deformation, and floor heave are frequent, making solutions to roadway support issues an urgent matter.

[0003] Existing tunnel support technologies have shortcomings. Some technologies only provide localized support without considering the overall mechanical properties of the surrounding rock, resulting in uneven support effects and weak control over deformation in deep surrounding rock. Composite support technologies have flawed construction processes and synergistic effects; different support methods are not tightly integrated, leading to limited strength improvement and high costs and time consumption. Active support technologies have poor adaptability to complex geology and mining impacts, and cannot dynamically adjust support forces according to surrounding rock deformation. "Integrated tunneling, anchoring, and grouting" is a leading technology that combines tunneling, anchoring, and grouting to achieve efficient synergy between tunneling and support. It can promptly anchor and control the impact of rockburst and mining pressure on the surrounding rock, while grouting reinforces the surrounding rock, fills fissures, improves overall strength and stability, prevents large deformations, reduces secondary maintenance work, lowers costs, and increases tunneling speed and production efficiency. Full-length anchoring followed by grouting wraps the support rods to prevent corrosion, extend tunnel life, and improve safety technology levels, showing broad application prospects.

[0004] Currently, mining anchor cables consist of steel strands, locking devices, trays, and accessories, but lack grouting functionality. With increasing coal mine service life and mining depth, roadways are aging, and issues related to surrounding rock control and roof support are becoming more prominent. Currently, the hollow grouting anchor cables used in coal mines have had one central steel strand removed as a grouting channel. This changes the original 19 steel strands to 18, altering the strand structure and reducing the anchor cable's tensile strength. Furthermore, the hollow channel is prone to blockage due to the bending of the steel strands during installation. Moreover, existing anchor cables cannot significantly improve support strength, cannot reinforce or improve surrounding rock, fill cracks, or effectively prevent surrounding rock deformation and damage. The installation process is also complex, increasing construction time and labor intensity, thus affecting support effectiveness and safety.

[0005] Based on the above, it is essential to develop a new type of mine anchor cable sealing device. It should be based on "integrated anchoring and grouting, pressure relief" technology, adding grouting functionality without altering the basic component structure to achieve integrated operation; it should be able to dynamically adjust the support force, improve strength, simplify operation, reduce costs, and enhance production efficiency and safety levels to meet the needs of deep coal mining. Utility Model Content

[0006] The purpose of this utility model is to overcome the defects and deficiencies of the existing technology and provide a new type of sealing device for mining anchor cables, which solves the various problems existing in the existing technology.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A novel sealing device for mining anchor cables includes a base with a steel strand channel in the middle for steel strands to pass through. A grouting pipe, fitted over the steel strand, is embedded in the upper end of the steel strand channel. A sealing pipe is fitted over the grouting pipe, and a gap channel for grout to pass through is provided between the outer wall of the grouting pipe and the inner wall of the sealing pipe. A sealing ring is provided on the upper end of the sealing pipe, and the inner wall of the sealing ring has a concave cavity. The concave cavity and the sealing pipe form a sealing chamber, and the upper end of the concave cavity communicates with the gap channel. The lower end of the base has a grouting channel connected to the steel strand channel. The upper end of the grouting channel has a one-way channel communicating with it and leading the grout to the gap channel. A sealing ring for sealing and preventing grout leakage is installed at the lower end of the steel strand channel.

[0009] The upper end of the steel strand channel is a stepped hole. The stepped sections are used to hold the grouting pipe and the sealing pipe, respectively. The grouting pipe and the sealing pipe are embedded and fixed on the corresponding stepped sections, and are sealed to the base by a sealing ring.

[0010] The upper end of the sealing tube has an outer annular cavity on its outer wall, and the outer annular cavity is located in the middle of the sealing chamber.

[0011] The sealing ring is fitted with clamps on the outer walls of its upper and lower ends to enhance sealing reliability and prevent media leakage.

[0012] A one-way valve is installed in the one-way channel, and a safety valve is installed at the inner end of the grouting channel.

[0013] The sealing ring is a one-way nine-hole groove sealing ring.

[0014] The unidirectional nine-hole groove sealing ring includes a sealing ring body. The upper end of the sealing ring body is a conical section, and the lower end is a small-diameter cylindrical section. The holes in the middle of the sealing ring body corresponding to the conical section are evenly distributed with inner convex ribs, and the inner convex ribs form nine-hole grooves.

[0015] The opening of the conical section is provided with a gradually tapered chamfered structure to reduce frictional damage during the strand threading process.

[0016] The lower end of the steel strand channel is provided with a groove. The conical section of the one-way nine-hole groove sealing ring is on top and the cylindrical section is on the bottom. It is inserted into the groove and fixed by a snap ring. The upper half of the groove is conical and matches the conical section of the sealing ring body. The lower end of the conical section is provided with a vertical section that seals with the groove.

[0017] Compared with existing technologies, this utility model is a comprehensive technical device that integrates grouting and sealing functions, and its specific advantages are as follows:

[0018] (1) This device achieves the grouting function without changing the properties of the steel strand. When the grout is filled, the expanding sealing ring can effectively prevent the grout from leaking from the sealing point and play a sealing role. It is a key component for realizing the full-length anchoring technology of anchor rods and anchor cables. While ensuring the completeness of the function, it has an exquisite shape, simplifies the operation process, and reduces the labor intensity of operators.

[0019] (2) The application of this device can significantly reduce costs and has high economic value; it can be installed together with the anchor cable and has grouting function without changing the structural properties of the anchor cable, thus avoiding additional complicated installation procedures and cost inputs.

[0020] (3) This sealing device has excellent flexibility in the coal mine support process. It can be set in advance during the coal mine support process and grouting can be carried out when the roadway is affected by stress and mining. It can also be used to carry out grouting operations at the same time as the surrounding rock of the excavated roadway is supported by anchor bolts and anchor cables, based on the existing coal mine mining technology.

[0021] (4) This device can significantly improve the support strength and effectively prevent the roof and surrounding rock from deforming, sinking, and roof collapse due to stress and mining. It eliminates safety hazards from the root and provides a solid guarantee for safe production in coal mines. It meets the relevant requirements of the state for safe production in coal mines. While improving the technical level of safe production in coal mines, it creates good social and economic benefits and provides strong support for the sustainable development of the coal mining industry. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 A schematic diagram of the sealing ring structure;

[0024] Figure 3 for Figure 2 The main view;

[0025] Figure 4 for Figure 2 Top view.

[0026] Figure label:

[0027] 1. Base; 2. Sealing pipe; 3. Grouting pipe; 4. Grouting channel; 5. Safety valve; 6. One-way valve; 7. One-way channel; 8. Sealing ring; 9. Sealing sealing ring; 91. Conical section; 92. Cylindrical section; 93. Nine-hole groove; 94. Beveled angle; 95. Vertical section; 10. Steel strand channel; 11. Inner concave cavity; 12. Outer annular concave cavity; 13. Clamp; 14. Snap ring. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0029] See appendix Figure 1-4 ;

[0030] A novel sealing device for mining anchor cables includes a base 1. A steel strand channel 10 is provided in the middle of the base 1 for steel strands to pass through. A grouting pipe 3, fitted around the steel strand, is embedded in the upper end of the steel strand channel 10. A sealing pipe 2 is fitted around the grouting pipe 3. A gap channel for grouting fluid is provided between the outer wall of the grouting pipe 3 and the inner wall of the sealing pipe 2. A sealing ring 8 is provided on the upper end of the sealing pipe 2. The inner wall of the sealing ring 8 has a concave cavity 11, which forms a sealing chamber with the sealing pipe 2. The upper end of the concave cavity 11 communicates with the gap channel. A grouting channel 4, connected to the steel strand channel, is provided at the lower end of the base 1. A one-way channel 7, connected to the grouting channel 4 and leading the grout to the gap channel, is provided at the upper end of the grouting channel 4. A one-way valve 6 is installed in the one-way channel 7, and a safety valve 5 is installed at the inner end of the grouting channel 4. The one-way valve and safety valve installed in the grouting channel ensure that the sealing ring expands and has a sealing function at the same time as grouting, realizing the concept of "one device, multiple functions". The lower end of the steel strand channel 10 is equipped with a sealing ring 9 for sealing and preventing grout leakage.

[0031] Furthermore, the upper end of the steel strand channel 10 is a stepped hole. The stepped sections are used to mount the grouting pipe 3 and the sealing pipe 2, respectively. The grouting pipe 3 and the sealing pipe 2 are embedded and fixed on the corresponding stepped sections, and are sealed to the base 1 by a sealing ring. The stepped sections of different diameters provide precise installation positioning for the grouting pipe and the sealing pipe, and the embedded fixing increases the connection strength between the pipe and the channel. The grouting pipe forms a dedicated grouting channel to ensure accurate injection of grout into the target area, and relies on the sealing ring to seal with the base to prevent grout leakage during grouting. The sealing pipe is used to seal the channel after grouting to prevent the intrusion of external moisture and debris. It is also sealed to the base by a sealing ring, and together with the sealing of the grouting pipe, they form a complete sealing system to comprehensively protect the quality and reliability of the engineering structure.

[0032] Furthermore, the upper end of the sealing pipe 2 has an outer annular cavity 12 on its outer wall, and the outer annular cavity 12 is located in the middle of the sealing chamber. The outer annular cavity enhances the sealing effect. Clamps 13 are respectively fitted and fixed to the upper and lower ends of the sealing ring 8 on its outer wall. During grouting, the grout enters the sealing ring through a one-way valve installed in the channel, causing the sealing ring to expand immediately within the orifice without depressurization, thus achieving the sealing function. The clamps 13 enhance the sealing reliability and prevent media leakage.

[0033] Furthermore, the sealing ring 9 is a one-way nine-hole groove sealing ring. It is pre-installed within the device and fixed to the steel strand after it passes through. During installation and use, a key point is that the diameter of the central channel of the new mining anchor cable is φ26mm, the anchor cable diameter is φ21.8mm, and the difference after the anchor cable rod passes through the channel is 4.2mm. A sealing ring must be installed in the hollow part to prevent grout from flowing out. Due to the special location and structure, and the high grouting pressure, through continuous use, summarization, adjustment, and trial production, a one-way nine-hole groove rubber sealing ring with sealing function was invented for use with the new mining anchor cable. The one-way nine-hole groove sealing ring includes a sealing ring body. The upper end of the sealing ring body is a conical section 91, and the lower end is a small-diameter cylindrical section 92. The holes in the middle of the sealing ring body corresponding to the conical section 91 are evenly distributed with internally protruding ribs, which form nine-hole grooves 93.

[0034] The device is installed together with the steel strand. The steel strand automatically enters the sealing ring, and the outer surface groove and the inner groove of the sealing ring are in close contact, thus performing its sealing function. This sealing ring has a unique structure; it is made of flame-retardant rubber and has a sealing function to prevent grout leakage. It is unidirectionally installed, following the installation of the anchor rod, along with the new type of mining anchor cable; it cannot be installed bidirectionally. It has nine evenly distributed grooves inside, which perfectly match the recessed parts between each strand of the anchor rod, preventing grout leakage from these points. This sealing ring is already installed internally during the manufacturing of the new type of mining anchor cable, and its lower part is fixed by grooves and spring clips, eliminating the need for secondary installation during construction. Operation is simple and convenient. Because the sealing ring seals the anchor cable contact section with a spiral structure, unlike ordinary sealing rings, it is a special sealing ring. The opening of the conical section 91 has a chamfered angle 94 structure to reduce frictional damage during the steel strand threading process. This forms a low-resistance guiding channel during the steel strand threading process, allowing the steel strand to slide naturally along the inclined surface rather than suddenly turning, effectively dispersing contact stress and avoiding local jamming. The lower end of the steel strand channel 10 is provided with a groove, the conical section 91 of the one-way nine-hole groove sealing ring is on top, and the cylindrical section 92 is below, which is inserted into the groove and fixed by the snap ring 14. The upper half of the groove is conical and matches the conical section of the sealing ring body. The lower end of the conical section 91 is provided with a vertical section 95 that seals the groove.

[0035] In summary, the sealing device is cylindrical in shape and consists of two parts. The upper part includes the grouting pipe, sealing ring, and one-way valve. The expanding sealing ring seals the grout in the injection hole and the rock stratum. The lower part consists of the grouting channel, sealing ring channel, safety valve, and steel strands. During grouting, the grout enters the one-way valve 6 through channel 4, opening the valve core before its spring. It then enters the channel between the 2φ35 steel pipe and the 3φ30 steel pipe through channel 7, before entering the sealing ring 8. Once the grout fills the channel, it will expand the sealing ring 8. After reaching a certain pressure, the one-way valve will close. The grout will then enter the safety valve 5 through channel 4. After the safety valve is opened, it enters the anchor cable channel 10 and then flows into the rock stratum through this channel. A one-way nine-hole groove sealing ring 9 is installed at the base of the sealing device.

[0036] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0037] Therefore, the above description is only a preferred embodiment of this application and is not intended to limit the scope of this application; that is, all equivalent modifications made in accordance with the scope of the claims of this application shall be within the protection scope of the claims of this application.

Claims

1. A novel sealing device for mining anchor cables, comprising a base (1), wherein a steel strand channel (10) for passing through a steel strand is provided in the middle of the base (1), and a grouting pipe (3) fitted around the steel strand is embedded in the upper end of the steel strand channel (10), characterized in that: The grouting pipe (3) is fitted with a sealing pipe (2), and a gap channel for grout to pass through is provided between the outer wall of the grouting pipe (3) and the inner wall of the sealing pipe (2). A sealing ring (8) is provided on the upper end of the sealing pipe (2). A concave cavity (11) is provided on the inner wall of the sealing ring (8). The concave cavity (11) and the sealing pipe (2) form a sealing chamber. The upper end of the concave cavity (11) is connected to the gap channel. The lower end of the base (1) is provided with a grouting channel (4) connected to the steel strand channel. The upper end of the grouting channel (4) is provided with a one-way channel (7) connected to it and leading the grout to the gap channel. A sealing ring (9) for sealing and preventing grout leakage is installed at the lower end of the steel strand channel (10).

2. The novel sealing device for mining anchor cables according to claim 1, characterized in that: The upper end of the steel strand channel (10) is a stepped hole. The stepped sections are used to install the grouting pipe (3) and the sealing pipe (2). The grouting pipe (3) and the sealing pipe (2) are embedded and fixed on the corresponding stepped sections, and are sealed with the base (1) by the sealing ring.

3. The novel sealing device for mining anchor cables according to claim 1, characterized in that: The upper end of the sealing tube (2) has an outer annular cavity (12) on its outer wall, and the outer annular cavity (12) is located in the middle of the sealing chamber.

4. The novel sealing device for mining anchor cables according to claim 1, characterized in that: The sealing ring (8) is fitted with clamps (13) on the outer walls of its upper and lower ends to enhance sealing reliability and prevent media leakage.

5. The novel sealing device for mining anchor cables according to claim 1, characterized in that: A one-way valve (6) is installed in the one-way channel (7), and a safety valve (5) is installed at the inner end of the grouting channel (4).

6. The novel sealing device for mining anchor cables according to claim 1, characterized in that: The sealing ring (9) is a one-way nine-hole groove sealing ring.

7. The novel sealing device for mining anchor cables according to claim 6, characterized in that: The unidirectional nine-hole groove sealing ring includes a sealing ring body. The upper end of the sealing ring body is a conical section (91), and the lower end is a small-diameter cylindrical section (92). The hole in the middle of the sealing ring body corresponding to the conical section (91) is evenly distributed with inner convex ribs, and the inner convex ribs form a nine-hole groove (93).

8. The novel sealing device for mining anchor cables according to claim 7, characterized in that: The opening of the conical section (91) is provided with a chamfered (94) structure to reduce frictional damage during the strand threading process.

9. The novel sealing device for mining anchor cables according to claim 7, characterized in that: The lower end of the steel strand channel (10) is provided with a groove. The conical section (91) of the one-way nine-hole groove sealing ring is on top and the cylindrical section (92) is on the bottom. It is inserted into the groove and fixed by a snap ring (14). The upper half of the groove is a cone shape that matches the conical section of the sealing ring body. The lower end of the conical section (91) is provided with a vertical section (95) that seals the groove.

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