Grouting anchor rod device for coal mining

Abstract

The invention discloses a grouting anchor rod device for coal mining, and relates to the technical field of mine supporting, the grouting anchor rod device comprises an anchor rod body, a protection mechanism is arranged on the outer surface of the anchor rod body, the protection mechanism comprises a mounting sleeve, the mounting sleeve is fixedly connected to the top of the anchor rod body, and a plurality of mounting rods are fixedly connected to the inner surface of the mounting sleeve. Through the arrangement of the protection mechanism, when the anchor rod body is inserted into the hole, the rotating rods and the supporting rods which are evenly distributed on the outer surface of the anchor rod body are driven to be unfolded under the cooperation of the counter-acting force generated by the bottom of the hole on the pressed sliding rod and the pushing block, and therefore the anchor rod body is located in the center of the hole; when the anchor rod is inserted into a hole in the side of a roadway, the situation that the placing position of the anchor rod body deviates due to gravity is greatly avoided, the space between the outer surface of the anchor rod body and the hole is more uniform, slurry distribution is more uniform during follow-up grouting, and therefore the supporting effect of the anchor rod is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of mine tunnel support, and particularly to a grouting bolt device for coal mine excavation. Background Art

[0002] The grouting bolt device for coal mine excavation is a support system specifically designed for the complex geological conditions in coal mine shafts (such as broken roof, high stress, gas outburst, etc.). By using the grouting reinforcement technology, the stability of the surrounding rock is improved to ensure the safety of coal mining operations.

[0003] When most existing grouting bolts are in use, it is necessary to first drill the part of the coal mine roadway that needs to be supported. Install a tray, nut, and grout stopper at the tail of the grouting bolt, and then insert it into the pre-drilled hole in the roadway. Through a grouting pump, high-pressure cement slurry is injected into the hollow bolt. The slurry seeps out from the grouting holes in the bolt body and penetrates into the cracks in the surrounding rock. Finally, after the slurry hardens, an active support system is formed.

[0004] Although the above-mentioned bolt can better solve the problem of coal mine roadway support during use, during the process of installing and grouting the grouting bolt, since the grouting bolt needs to be inserted into the holes in both the roof and the sidewall of the roadway for support, when the grouting bolt is inserted into the holes in the roof and the sidewall of the roadway, there will be a difference in the placement angle. When the grouting bolt is inserted into a relatively horizontal hole in the sidewall of the roadway, due to the influence of gravity, the inserted bolt will fit more closely to the bottom of the hole, and there will be a large space between the upper part of the bolt and the hole, resulting in the deviation of the placement position of the bolt in the hole in the sidewall of the roadway, and uneven distribution of the slurry in the hole in the sidewall of the roadway. Furthermore, after the slurry hardens, the bonding force of the hole wall is uneven, thus affecting the support effect of the grouting bolt.

[0005] Therefore, the present invention proposes a grouting bolt device for coal mine excavation to solve the above problems. Summary of the Invention

[0006] In view of this, the technical problem to be solved by the present invention is to provide a grouting bolt device for coal mine excavation to solve the problem in the prior art that when the grouting bolt is inserted into a relatively horizontal hole in the sidewall of the roadway, due to the influence of gravity, the inserted bolt will fit more closely to the bottom of the hole, resulting in the deviation of the placement position of the bolt in the hole in the sidewall of the roadway and affecting the support effect after grouting of the grouting bolt.

[0007] To achieve the above object, the present invention provides the following technical solution: A grouting bolt device for coal mine excavation, including a bolt body, a protective mechanism is arranged on the outer surface of the bolt body, the protective mechanism includes an installation sleeve, the installation sleeve is fixedly connected to the top of the bolt body, a plurality of installation rods are fixedly connected to the inner surface of the installation sleeve, a plurality of rotating rods are rotatably connected to the outside of each installation rod, a pressure-receiving sliding rod is slidably connected in each installation rod, a plurality of pushing blocks are fixedly connected to one side of the pressure-receiving sliding rod, each pushing block is slidably connected to the installation rod, the pushing block is slidably connected to the adjacent rotating rod, the sides of the rotating rod and the pushing block close to each other are both arranged as inclined surfaces, when the top of the pressure-receiving sliding rod is pressed, the rotating rod can be driven to rotate through the pushing block, and the protective mechanism is used to make the position of the bolt body inserted into the hole centered.

[0008] Preferably, it is characterized in that: A plurality of guide rods are fixedly connected to one side of the pushing block, each guide rod is slidably connected to the installation rod, and the guide rod is arranged as an arc.

[0009] Preferably, it is characterized in that: The guide rod slides through the drive of the rotating rod.

[0010] Preferably, it is characterized in that: A support rod is slidably connected to the top of each rotating rod, and a compression spring is fixedly connected between the support rod and the rotating rod.

[0011] Preferably, it is characterized in that: Two balls are rotatably connected to the top of the support rod, and when the rotating rod does not rotate, the balls are in contact with the installation rod.

[0012] Preferably, it is characterized in that: It further includes a limiting mechanism for assisting in fixing the protective mechanism, the limiting mechanism includes an installation groove, the installation groove is opened on one side of the pressure-receiving sliding rod, a limiting block is slidably connected in the installation groove, a support spring is fixedly connected between the limiting block and the installation groove, two limiting grooves are opened on one side of the installation rod close to the limiting block, and the limiting block can be inserted into any one of the limiting grooves.

[0013] Preferably, it is characterized in that: The end of the limiting block close to the limiting groove is arranged as a hemispherical shape, and the limiting groove is adapted to the shape of the limiting block.

[0014] Preferably, it is characterized in that: An auxiliary mechanism for limiting the top of the bolt body is arranged on the top of the installation sleeve, the auxiliary mechanism includes a plurality of protective rods, each protective rod is slidably connected to the top of the installation sleeve, a guide block is fixedly connected to the top of each pressure-receiving sliding rod, clamping blocks are fixedly connected to both sides of the protective rod, and the clamping blocks are clamped with the installation sleeve.

[0015] Preferably, it is characterized in that: one side of the protective rod close to the compression sliding rod is arranged as an inclined surface, one side of the guide block is arranged as an inclined surface, and when the guide block moves downward, it can push the adjacent protective rod to slide through the inclined surface.

[0016] Preferably, it is characterized in that: the protective rods are evenly distributed on the top of the installation sleeve.

[0017] Compared with the prior art, the present invention provides a grouting bolt device for coal mine excavation, having the following beneficial effects:

[0018] 1. Through the setting of the protection mechanism of the present invention, when the bolt body is inserted into the hole, under the cooperation of the reaction force generated by the bottom of the hole on the compression sliding rod and the push block, the rotating rods and support rods evenly distributed on the outer surface of the bolt body are driven to unfold, so that the bolt body is located at a more central position in the hole. When it is inserted into the hole in the roadway side, the situation that the placement position of the bolt body is offset due to gravity is greatly avoided, making the space between the outer surface of the bolt body and the hole more uniform. Furthermore, when grouting subsequently, the distribution of the grout is also more uniform, thus ensuring the support effect of the bolt.

[0019] 2. Through the setting of the protection mechanism of the present invention, even when the bolt body is inserted into the hole in the roadway roof, the bolt body can also be located at the central position of the hole in the roadway roof through the protection mechanism, effectively preventing the situation of skew when manually inserting the bolt body, ensuring the grouting uniformity of the bolt body inserted into the hole in the roadway roof. And when the bolt body is inserted into a vertical hole, by blocking the unfolding of the rotating rod and the support rod, the speed at which the grout accelerates downward due to the influence of gravity can be reduced, prolonging the residence time of the grout at the top of the bolt body, enabling the grout to flow into the gap between the bolt and the hole wall for a longer time, and further improving the effect when grouting the bolt body.

[0020] 3. Through the setting of the auxiliary mechanism of the present invention, after the bolt body is inserted into the hole, by the abutment of the protective rod with the inner wall of the hole, the stability of the top of the bolt body can be improved, avoiding the situation that the top of the bolt body shakes or even skews due to the contact between the grout and the hole when grouting the top of the bolt body, and further ensuring the stability and uniformity when grouting the top of the bolt body into the hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a three-dimensional structure diagram of the present invention;

[0022] Figure 2 is the present invention Figure 1 partial three-dimensional structure diagram;

[0023] Figure 3 is the present invention Figure 2 partial cross-sectional structure diagram;

[0024] Figure 4 For the present invention Figure 2 Partial three-dimensional structure diagram;

[0025] Figure 5 Structure diagram of the installation sleeve and the installation rod in the present invention;

[0026] Figure 6 Partial sectional structure diagram of the installation rod of the present invention;

[0027] Figure 7 Three-dimensional structure diagram of the top of the installation sleeve in the present invention.

[0028] In the figure:

[0029] 1. Anchor rod body;

[0030] 201. Installation sleeve; 202. Installation rod; 203. Rotating rod; 204. Compression sliding rod; 205. Push block; 206. Guide rod; 207. Support rod; 2071. Ball; 208. Compression spring;

[0031] 301. Installation groove; 302. Limit block; 303. Support spring; 304. Limit groove;

[0032] 401. Guide block; 402. Protection rod; 403. Clamping block. Detailed implementation manners

[0033] Now, the subject matter described herein will be discussed with reference to example embodiments. It should be understood that discussing these embodiments is only to enable those skilled in the art to better understand and thus implement the subject matter described herein. Without departing from the scope of protection of the content of this specification, changes can be made to the functions and arrangements of the elements discussed. Each example can omit, substitute, or add various processes or components as needed. Additionally, the features described in some examples can also be combined in other examples.

[0034] As Figure 1-7As shown in the figure, this embodiment provides a grouting bolt device for coal mine excavation, which includes a bolt body 1. A protection mechanism is arranged on the outer surface of the bolt body 1. The protection mechanism includes an installation sleeve 201. The installation sleeve 201 is fixedly connected to the top of the bolt body 1. The installation sleeve 201 is fixed to the bolt body 1 through bolts and can be installed with the bolt body 1 according to the hole distribution. During installation, the bolt body 1 is inserted into the installation sleeve 201 from bottom to top. A plurality of installation rods 202 are fixedly connected to the inner surface of the installation sleeve 201. The installation rods 202 are evenly distributed on the outer surface of the bolt body 1. A plurality of rotating rods 203 are rotatably connected to the outside of each installation rod 202. A pressure-bearing sliding rod 204 is slidably connected to each installation rod 202. A plurality of push blocks 205 are fixedly connected to one side of the pressure-bearing sliding rod 204. Each push block 205 is slidably connected to the installation rod 202. The push block 205 is slidably connected to the adjacent rotating rod 203. The sides of the rotating rod 203 and the push block 205 close to each other are both provided with inclined surfaces. When the top of the pressure-bearing sliding rod 204 is pressed, the rotating rod 203 can be driven to rotate through the push block 205. The protection mechanism is used to make the position of the bolt body 1 inserted into the hole centered.

[0035] A plurality of guide rods 206 are fixedly connected to one side of the push block 205. Each guide rod 206 is slidably connected to the installation rod 202. The guide rod 206 is set to be arc-shaped. The guide rod 206 slides through the drive of the rotating rod 203. A support rod 207 is slidably connected to the top of each rotating rod 203. A compression spring 208 is fixedly connected between the support rod 207 and the rotating rod 203. Two balls 2071 are rotatably connected to the top of the support rod 207. When the rotating rod 203 does not rotate, the ball 2071 abuts against the installation rod 202.

[0036] Through the setting of the ball 2071, when the support rod 207 slides outwards, the ball 2071 can reduce the friction between the support rod 207 and the installation rod 202, so that the sliding of the support rod 207 is smoother.

[0037] Compared with the prior art, through the setting of the protection mechanism, when it is inserted into the hole in the side wall of the roadway, it greatly avoids the situation that the placement position of the bolt body 1 is offset due to gravity, makes the space between the outer surface of the bolt body 1 and the hole more uniform, and then makes the distribution of the slurry more uniform during subsequent grouting, thus ensuring the support effect of the bolt. And through the protection mechanism, the bolt body 1 can also be located at the center position of the hole in the roadway roof, effectively preventing the situation of skew when the bolt body 1 is manually inserted, ensuring the grouting uniformity when the bolt body 1 is inserted into the hole in the roadway roof. And when the bolt body 1 is inserted into the vertical hole, through the blocking of the rotating rod 203 and the support rod 207, the speed of the slurry flowing downward under the influence of gravity can be reduced, the residence time of the slurry at the top of the bolt body 1 can be extended, and the slurry has a longer time to flow into the gap between the bolt and the hole wall, further improving the effect of grouting the bolt body 1.

[0038] Further embodiment:

[0039] It further includes a limiting mechanism for assisting in fixing the protection mechanism. The limiting mechanism includes an installation groove 301, which is opened on one side of the pressure-receiving sliding rod 204. A limiting block 302 is slidably connected in the installation groove 301. A support spring 303 is fixedly connected between the limiting block 302 and the installation groove 301. Two limiting grooves 304 are opened on one side of the installation rod 202 close to the limiting block 302. The limiting block 302 can be inserted into any one of the limiting grooves 304. One end of the limiting block 302 close to the limiting groove 304 is set as a hemispherical shape, and the limiting groove 304 is adapted to the shape of the limiting block 302. Through the setting of the limiting mechanism, the stability of the protection mechanism when it is unfolded can be ensured.

[0040] Even further embodiment:

[0041] An auxiliary mechanism for limiting the top of the bolt body 1 is provided at the top of the installation sleeve 201. The auxiliary mechanism includes a plurality of protection rods 402. Each protection rod 402 is slidably connected to the top of the installation sleeve 201. A guide block 401 is fixedly connected to the top of each pressure-receiving sliding rod 204. Clamping blocks 403 are fixedly connected to both sides of the protection rod 402. The clamping blocks 403 are clamped with the installation sleeve 201. One side of the protection rod 402 close to the pressure-receiving sliding rod 204 is set as an inclined surface, and one side of the guide block 401 is set as an inclined surface. When the guide block 401 moves downward, it can push the adjacent protection rod 402 to slide through the inclined surface. The protection rods 402 are evenly distributed on the top of the installation sleeve 201.

[0042] Through the setting of the auxiliary mechanism, it avoids the situation that the top of the bolt body 1 shakes or even skews when grouting at the top of the bolt body 1 due to the contact between the slurry and the hole, and further ensures the stability and uniformity of grouting the top of the bolt body 1 into the hole.

[0043] The working principle of all the contents in the above embodiments is as follows:

[0044] State before work: After installing the corresponding accessories onto the bolt body 1 and before inserting it into the hole in the roadway side, the rotating rod 203 is in an unrotated state and is located inside the mounting rod 202, and the support rod 207 is located inside the rotating rod 203, and the compression spring 208 is in a compressed state.

[0045] The following is the working principle and its beneficial effects of the protection mechanism:

[0046] After the staff inserts the bolt body 1 into the hole in the roadway side, the top of the bolt body 1 gradually approaches the bottom of the hole, and thus the top of the pressure-receiving sliding rod 204 and the guiding block 401 gradually approach the bottom of the hole. After approaching, under the thrust generated by the hole, the guiding block 401 and the pressure-receiving sliding rod 204 can slide towards the mounting sleeve 201. The pressure-receiving sliding rod 204 drives the push block 205 to slide downwards. Since the push block 205 is slidably connected to the rotating rod 203 and the sliding surface where the push block 205 is close to the rotating rod 203 is an inclined surface, when the push block 205 slides downwards, the inclined surface of the push block 205 pushes the inclined surface of the rotating rod 203, so that the rotating rod 203 rotates around the bottom as the center and gradually rotates away from the pressure-receiving sliding rod 204. Through the cooperation of multiple pressure-receiving sliding rods 204, push blocks 205 and rotating rods 203, multiple rotating rods 203 can rotate simultaneously. The upper end of the rotating rod 203 rotates and gradually approaches the hole wall. When rotating, the guiding rod 206 simultaneously slides on the mounting rod 202 along an arc trajectory to guide the rotating rod 203. At the same time, when the rotating rod 203 rotates outwards, the mounting rod 202 releases the limit on the top of the rotating rod 203. Then, under the pushing force of the resilience of the compression spring 208, the ball 2071 slides out of the rotating rod 203, and one end of the slid-out support rod 207 contacts the hole wall. Thus, with the cooperation of multiple rotating rods 203 and support rods 207 evenly distributed on the outer surface of the bolt body 1, the supporting force generated with the hole wall can make the bolt body 1 be in a relatively central position inside the hole.

[0047] Through the setting of the protection mechanism, when the bolt body 1 is inserted into the hole, with the cooperation of the reaction force generated by the bottom of the hole on the pressure-receiving sliding rod 204 and the push block 205, the rotating rods 203 and support rods 207 evenly distributed on the outer surface of the bolt body 1 are driven to expand, so that the bolt body 1 is in a relatively central position inside the hole. When it is inserted into the hole in the roadway side, it greatly avoids the situation that the placement position of the bolt body 1 deviates due to gravity, makes the space between the outer surface of the bolt body 1 and the hole more uniform, and further makes the distribution of the slurry more uniform during subsequent grouting, thus ensuring the support effect of the bolt.

[0048] In addition, through the cooperation of the support rod 207 and the compression spring 208, when the rotating rod 203 is unfolded, if the hole wall is uneven, the compression spring 208 can also push the support rod 207 to contact the uneven hole wall, so as to ensure the centering effect of the anchor rod body 1 when the protection mechanism is in use.

[0049] Through the setting of the protection mechanism, even when the anchor rod body 1 is inserted into the hole in the roadway roof, the protection mechanism can also make the anchor rod body 1 located at the center position of the hole in the roadway roof, effectively preventing the skew situation when the anchor rod body 1 is manually inserted, ensuring the grouting uniformity of the anchor rod body 1 inserted into the hole in the roadway roof, and when the anchor rod body 1 is inserted into a vertical hole, by expanding the blocking of the rotating rod 203 and the support rod 207, the speed of the slurry accelerating downward due to the influence of gravity can be reduced, prolonging the residence time of the slurry at the top of the anchor rod body 1, enabling the slurry to flow into the gap between the anchor rod and the hole wall for a longer time, and further improving the effect of grouting the anchor rod body 1.

[0050] The following is the working principle and its beneficial effects of the limiting mechanism:

[0051] Further, when the anchor rod body 1 is not inserted into the hole, as Figure 6 shown, the limiting block 302 is inserted into the upper limiting groove 304, increasing the resistance when the pressure-receiving sliding rod 204 slides, thus ensuring the stability of the pressure-receiving sliding rod 204 and the rotating rod 203, preventing the occurrence of mis-opening phenomenon, and when the top of the pressure-receiving sliding rod 204 is pushed by the bottom of the hole, since the limiting block 302 is set as a sphere and the shape of the limiting groove 304 is adapted to the limiting block 302, then through the extrusion of the spherical surface of the limiting block 302 by the limiting groove 304, the limiting block 302 slides into the installation groove 301, the support spring 303 is compressed, until the pressure-receiving sliding rod 204 slides under pressure to an appropriate position, the limiting block 302 is aligned with the lower limiting groove 304, at this time, under the pushing of the resilience of the support spring 303, the limiting block 302 can be inserted into the lower limiting groove 304, continuously increasing the resistance when the pressure-receiving sliding rod 204 slides, and further ensuring the stability when the protection mechanism is unfolded.

[0052] The following is the working principle and its beneficial effects of the auxiliary mechanism:

[0053] Furthermore, when the guiding block 401 and the pressure-receiving sliding rod 204 slide towards the installation sleeve 201, the inclined surface of the guiding block 401 gradually approaches the inclined surface of the protection rod 402. Then, under the extrusion of the inclined surface of the guiding block 401 on the inclined surface of the protection rod 402, the protection rod 402 can be pushed to slide away from the anchor rod body 1, and the clamping block 403 is disengaged from the clamping connection with the installation sleeve 201. Until the guiding block 401 stops sliding, the protection rod 402 abuts against the inner wall of the hole.

[0054] Through the setting of the auxiliary mechanism, after the bolt body 1 is inserted into the hole, the stability of the top of the bolt body 1 can be improved by the abutment of the protective rod 402 against the inner wall of the hole, avoiding the situation that the top of the bolt body 1 shakes or even tilts due to the contact between the slurry and the hole when grouting the top of the bolt body 1, and further ensuring the stability and uniformity when grouting the top of the bolt body 1 into the hole.

[0055] The embodiments of the present invention have been described above, but the embodiments are not limited to the above specific implementation manners. The above specific implementation manners are only illustrative and not restrictive. Under the inspiration of this embodiment, those of ordinary skill in the art can also make many forms, all of which fall within the protection scope of this embodiment.

Claims

1. A grouting bolt device for coal mine excavation, including a bolt body (1), characterized in that, A protective mechanism is arranged on the outer surface of the anchor rod body (1); The protective mechanism includes an installation sleeve (201), the installation sleeve (201) is fixedly connected to the top of the anchor rod body (1), a plurality of installation rods (202) are fixedly connected to the inner surface of the installation sleeve (201), a plurality of rotating rods (203) are rotatably connected to the outside of each installation rod (202), a pressure-bearing sliding rod (204) is slidably connected in each installation rod (202), a plurality of pushing blocks (205) are fixedly connected to one side of the pressure-bearing sliding rod (204), each pushing block (205) is slidably connected to the installation rod (202), the pushing block (205) is slidably connected to the adjacent rotating rod (203), and the sides of the rotating rod (203) and the pushing block (205) close to each other are both arranged as inclined surfaces; When the top of the pressure-bearing sliding rod (204) is pressed, the rotating rod (203) can be driven to rotate through the pushing block (205), and the protective mechanism is used to center the position where the anchor rod body (1) is inserted into the hole.

2. The grouting bolt device for coal mine excavation according to claim 1, characterized in that: A plurality of guide rods (206) are fixedly connected to one side of the pushing block (205), each guide rod (206) is slidably connected to the installation rod (202), and the guide rod (206) is arranged in an arc shape.

3. The grouting bolt device for coal mine mining according to claim 2, characterized in that: The guide rod (206) slides through the drive of the rotating rod (203).

4. A grouting bolt device for coal mine excavation according to claim 3, characterized in that: A support rod (207) is slidably connected to the top of each rotating rod (203), and a compression spring (208) is fixedly connected between the support rod (207) and the rotating rod (203).

5. The grouting bolt device for coal mine excavation according to claim 4, characterized in that: Two balls (2071) are rotatably connected to the top of the support rod (207), and when the rotating rod (203) does not rotate, the balls (2071) are abutted against the installation rod (202).

6. A grouting bolt device for coal mine mining according to claim 1, characterized in that: The utility model further includes a limiting mechanism for assisting in fixing the protective mechanism, the limiting mechanism includes an installation groove (301), the installation groove (301) is opened on one side of the pressure-bearing sliding rod (204), a limiting block (302) is slidably connected in the installation groove (301), a support spring (303) is fixedly connected between the limiting block (302) and the installation groove (301), two limiting grooves (304) are opened on one side of the installation rod (202) close to the limiting block (302), and the limiting block (302) can be inserted into any one of the limiting grooves (304).

7. The grouting bolt device for coal mine excavation according to claim 6, characterized in that: One end of the limiting block (302) close to the limiting groove (304) is arranged in a hemispherical shape, and the limiting groove (304) is adapted to the shape of the limiting block (302).

8. A grouting bolt device for coal mine mining according to claim 1, characterized in that: An auxiliary mechanism for limiting the top of the anchor rod body (1) is arranged on the top of the installation sleeve (201), the auxiliary mechanism includes a plurality of protective rods (402), each protective rod (402) is slidably connected to the top of the installation sleeve (201), a guide block (401) is fixedly connected to the top of each pressure-bearing sliding rod (204), clamping blocks (403) are fixedly connected to both sides of the protective rod (402), and the clamping blocks (403) are clamped with the installation sleeve (201).

9. The grouting bolt device for coal mine excavation according to claim 8, characterized in that: One side of the protective rod (402) close to the compression sliding rod (204) is arranged as an inclined surface, one side of the guide block (401) is arranged as an inclined surface, and when the guide block (401) moves downward, it can push the adjacent protective rod (402) to slide through the inclined surface.

10. A grouting bolt device for coal mine excavation according to claim 9, characterized in that: The protective rods (402) are evenly distributed on the top of the mounting sleeve (201).

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