Mining one-step hollow self-drilling anchor rod

Abstract

The utility model discloses a mining one-step hollow self-drilling anchor rod which comprises a hollow rod body, a self-locking mechanism arranged at the tail end of the hollow rod body, a drilling structure arranged at the head of the hollow rod body, and a piston, a steel wire and a resin anchoring agent which are arranged in an inner cavity of an anchoring section of the hollow rod body, the drilling structure comprises a plug and a drill bit, one-way ratchet teeth are machined on the matching faces of the plug and the drill bit, and the two ends of the steel wire are connected with the piston and the plug respectively. By adopting the anchor rod provided by the utility model and being matched with an onboard anchor rod drilling machine for a coal mine, drilling can be performed after the anchor rod is manually placed, an anchoring agent is immediately pushed out after drilling is finished to finish anchoring, and manual intervention is not needed in the whole process; according to the anchor rod, automatic installation of the anchor rod can be achieved only through the forward and reverse rotation function of the onboard anchor rod drilling machine for the coal mine, the construction technology of the anchor rod is greatly optimized, meanwhile, the labor intensity of workers is reduced, the influence of hole collapse on construction is reduced, and the efficiency of supporting construction is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of coal mine roadway anchoring and supporting, and particularly relates to a one-step hollow self-drilling anchor rod for mine use. BACKGROUND

[0002] Anchor rod support can effectively control the deformation of surrounding rock and is widely used in the fields of coal mines, metal mines and the like at home and abroad. Taking the fast excavation support of a coal mine roadway as an example, 50 meters of the roadway can be excavated per day, and about 14 sets of resin anchor rods are needed for supporting per 1 meter of excavation, and 700 sets of anchor rods need to be installed per day. The traditional manual support technology has a complicated construction process, and the process flow mainly includes the following 9 working procedures: drill rod installation, step-by-step hole forming, drill rod dismounting, anchor agent loading, anchor rod loading, anchor rod advancing, anchor agent stirring, waiting for solidification and pre-tightening, and the one-step hollow self-drilling anchor rod for mine use cannot meet the requirements of the excavation construction progress. In order to improve the anchor rod support efficiency, a series of automatic construction equipment such as an anchor rod support drilling machine and a drilling and anchoring integrated machine and the matching hollow grouting anchor rod are developed. SUMMARY

[0003] In order to overcome the above-mentioned defects of the prior art, the utility model provides a one-step hollow self-drilling anchor rod for mine use.

[0004] The utility model discloses a technical scheme that solves the technical problems: a one-step hollow self-drilling anchor rod for mine use, which comprises a hollow rod body, a self-locking mechanism arranged at the tail end of the hollow rod body, a drilling structure arranged at the head of the hollow rod body, a piston, a steel wire and a resin anchoring agent arranged in the inner cavity of the anchoring segment of the hollow rod body, the drilling structure comprises two parts of a plug and a drill bit, one-way ratchet teeth are processed on the matching surfaces of the plug and the drill bit, and the two ends of the steel wire are connected with the piston and the plug respectively.

[0005] Further, two pawls are arranged on the outside of the plug.

[0006] Further, a grouting hole is formed in the base body of the plug.

[0007] Further, the piston comprises a hollow wire tube and two sealing rings sleeved on the hollow wire tube, a spacing column is arranged between the two sealing rings, fastening nuts are arranged on the outside of the two sealing rings, an end cover is arranged at the end of the hollow wire tube, and a spring is arranged between the end cover and the fastening nut.

[0008] Further, the hollow rod body is a seamless steel pipe, the exposed end is processed with left-handed wave threads, and the anchoring segment is a seamless steel pipe.

[0009] Further, the drilling part of the drill bit is embedded with a hard alloy piece.

[0010] Further, the self-locking mechanism is a double-nut self-locking mechanism, which comprises a self-locking nut and a hexagonal nut.

[0011] Compared with the prior art, the anchor rod has the following advantages:

[0012] The anchor rod of the utility model, supporting the anchor rod drill of machine of coal mine, can drill after manual placing anchor rod, immediately push out anchoring agent (the plug rotates with the rod body in the process of pushing out anchoring agent, and the stirring of anchoring agent is completed) after drilling, and the whole process does not need manual intervention;The anchor rod of the utility model only uses the positive and negative rotation function (positive rotation is right rotation facing the rock wall, and negative rotation is left rotation facing the surrounding rock) of the anchor rod drill of machine of coal mine, and can realize automatic installation of the anchor rod, greatly optimizes the construction process of the anchor rod, and removes the processes of disassembling drill rod, installing anchor rod and stirring anchoring agent in the traditional process, simultaneously reduces the labor intensity of workers, reduces the influence of hole collapse on construction, and improves the efficiency of support construction.

[0013] 1、 Compared with the traditional anchor rod, the utility model uses hollow anchor rod to replace solid rod body, integrates resin anchoring agent in the inner cavity of the rod body, pushes out resin anchoring agent through rod body rotation and steel wire, and the tail end is provided with a drill bit for drilling.

[0014] 2、 The utility model adopts a new drilling structure, which is composed of a plug and a drill bit.

[0015] 3、 The utility model uses a new piston structure, uses a hollow wire pipe as a piston main body, enables drilling water to smoothly pass through the piston, and is provided with an end cover at the tail end of the wire pipe.

[0016] 4、 The anchor rod of the utility model can adopt one-step construction process, only needs to have positive and negative rotation function, can realize automatic installation of the anchor rod, greatly optimizes the construction process of the anchor rod, reduces the labor intensity of workers and the influence of hole collapse on construction, and improves the efficiency of support construction. BRIEF DESCRIPTION OF DRAWINGS

[0017] The utility model will be illustrated by examples and with reference to the drawings, wherein:

[0018] Figure 1 is the overall composition schematic diagram of the utility model;

[0019] Figure 2 is the drilling water supply schematic diagram of the utility model;

[0020] Figure 3 is the plug structure schematic diagram of the utility model;

[0021] Figure 4 is Figure 3 AA sectional view of the utility model;

[0022] Figure 5 is Figure 3 B enlarged view of the utility model;

[0023] Figure 6 is the side view of the plug of the utility model;

[0024] Figure 7 is the drill bit structure schematic diagram of the utility model;

[0025] Figure 8 is Figure 7 AA sectional view of the utility model;

[0026] Figure 9 is Figure 7 B enlarged view of the utility model;

[0027] Figure 10 is Figure 7 left view of the utility model;

[0028] Figure 11 is Figure 7 right view of the utility model;

[0029] Figure 12 is the anchoring agent pushing principle schematic diagram of the utility model;

[0030] Figure 13 is the self-locking mechanism structure schematic diagram of the utility model, wherein: (1) is the state of forming self-locking; (2) is the state of separating from self-locking;

[0031] Figure 14 is the structure schematic diagram of the piston of the utility model;

[0032] The figure mark includes: conical seal 1, self-locking nut 2, hexagonal nut 3, pad plate 4, piston 5 (including: hollow silk tube 51, fastening nut 52, end cover 53, spring 54, sealing ring 55, spacer column 56), hollow rod body 6, anchoring agent 7, steel wire 8, plug 9, drill bit 10. DETAILED DESCRIPTION

[0033] A mine one-step hollow self-drilling anchor rod, like Figure 1As shown, including: conical seal 1, self-locking nut 2, hex nut 3, backing plate 4, piston 5, hollow rod body 6, anchoring agent 7, steel wire 8, plug 9, drill bit 10 and so on, wherein:

[0034] Hollow rod body 6 is a seamless steel pipe, the exposed end is processed with left-handed wave thread, the anchoring segment is a seamless steel pipe, the built-in piston 5 and the resin anchoring agent 7, the plug 9 and the drill bit 10 are processed with one-way meshing ratchet teeth, and can rotate around the central shaft in one direction.

[0035] The working principle of the drilling water supply of the utility model is as shown in Figure 2 The working principle of the drilling water supply of the utility model is as shown in

[0036] The structure of the plug 9 of the utility model is as shown in Figures 3 to 6 The plug is installed at the end head of the anchor rod drilling end, a plurality of slurry outlet holes are formed in the base body, one-way ratchet teeth are processed on the drill bit cooperation surface, and two pawls are formed on the side surface, which are used for guiding the steel wire 8 to be wound on the surface of the drill bit 10;

[0037] The structure of the drill bit of the utility model is as shown in Figures 7 to 11 The drill bit drilling part is embedded with hard alloy pieces, one-way ratchet teeth are processed on the drill bit cooperation surface, the anchor rod drilling machine hydraulic motor is positively rotated, at this time, the plug ratchet teeth are engaged with the drill bit ratchet teeth, the coal rock is cut, the anchor rod drilling machine hydraulic motor is reversely rotated to separate the plug ratchet teeth from the drill bit ratchet teeth, and the plug and the drill bit start to rotate relatively.

[0038] The working principle of the anchoring agent pushing out of the utility model is as shown in Figure 12 In this process, the hollow rod body 6 is reversely rotated by driving the drilling machine hydraulic motor, the ratchet teeth of the plug 9 are disengaged from the ratchet teeth of the drill bit 10 to rotate relatively, the steel wire 8 is guided to be wound on the surface of the drill bit 10 through the plug 9, the piston 5 is moved towards the drill bit 10, the piston 5 is pulled by the steel wire 8, the resin anchoring agent is extruded (the anchoring agent end buckle is removed in advance, and can be easily broken), the anchoring agent flows out through the slurry outlet hole at the plug position, and is stirred by the rotating plug and the hollow rod body after being pushed out.

[0039] The working principle of the self-locking mechanism of the utility model is as shown in Figure 13 The anchor rod drilling machine hydraulic motor is positively rotated, the hex nut 3 is driven to retreat and abut against the self-locking nut (the rod body is processed with left-handed thread), double-nut self-locking is formed, the rod body is rotated to drill, as shown in Figure 13 (1); the hydraulic motor is reversely rotated, at this time, the hex nut is rotated forward along the rod body to separate from the self-locking nut, and the pre-tightening function is realized, as shown in Figure 13 (2);

[0040] The structure of the piston is shown in the utility model Figure 14 As shown in the utility model, comprising: hollow silk tube 51, fastening nut 52, end cover 53, spring 54, sealing ring 55, spacer column 56. Hollow silk tube 51 transports cooling water supply in the drilling process, sealing ring 55 seals water and air, prevents the piston from deflecting, end cover 53 is pressed and forms a seal with hollow silk tube 51, prevents the anchor agent from backflowing. The piston moves as a whole under the traction of steel wire 8 and pushes out the anchor agent.

[0041] The coal mine-used machine-mounted anchor rod drilling machine matched with the utility model is composed of a long feeding mechanism, a short feeding mechanism, a roof mechanism and a slide assembly rotating mechanism; the roof mechanism is extended and supported on the coal wall to be drilled when in use, and has the functions of stabilizing the anchor rod drilling machine and supporting the rod; the long and short feeding oil cylinders are connected in parallel by two oil cylinders; the short feeding oil cylinder causes the rotary drilling machine part to slide on the square guide rail; the long feeding oil cylinder causes the square guide rail to slide on the slide assembly; the rotating mechanism is composed of a motor and a water jacket, and transmits torque through an output shaft; the back sealing in the water jacket ensures the sealing of the slag water and gas; and two groups of bearings are used to offset the axial and radial loads; the construction process of the anchor rod of the utility model comprises: anchor rod installation, drilling machine drilling, pushing of the anchor agent, stirring of the setting agent and pre-tightening. Compared with the traditional construction process, the coal mine-used machine-mounted anchor rod drilling machine matched with the utility model can drill after the anchor rod is placed manually, and can supply water to push out the anchor agent and complete anchoring after drilling is completed, so that the processes of disassembling the drill rod, assembling the anchor rod, pushing the anchor rod and stirring the anchor agent in the traditional process are omitted, and the construction process of the anchor rod is greatly optimized.

[0042] The specific process flow is as follows:

[0043] 1) Drilling preparation: the rod body is assembled except the pad, the anchor rod is placed in the anchor rod drilling machine drill sleeve, the pad is placed on the anchor rod, the drilling machine is pushed to abut against the coal wall, the drilling cooling water supply is transported, the water flows through the hole in the rod body, flows to the position of the piston 5, passes through the hollow shaft of the piston and is transported to the position of the drill bit 10 (the water pressure is not enough to push the piston to move);

[0044] 2) Drilling: the anchor rod drilling machine hydraulic motor is driven to rotate forward, the hexagonal nut 3 is driven to retreat and abut against the self-locking nut 2 (the left-hand thread is processed on the exposed end of the rod body), the double-nut self-locking is formed, the rod body is driven to rotate and drill, at this time, the ratchet teeth of the plug 9 are engaged with the ratchet teeth of the drill bit 10, and the coal rock is cut;

[0045] 3) Push out the anchoring agent and stir: anchor rod drilling in place (hexagonal nut 3 close to the pad 4, pad 4 close to the coal wall), drive the drilling hydraulic motor reverse rotation, at this time the hexagonal nut 3 should be along the rod body into, but there is no moving space forward, so the rod body reverse rotation, the ratchet teeth of the plug 9 and the ratchet teeth of the drill bit 10 disengage and rotate relative to each other, so that the steel wire 8 is guided to wind on the surface of the drill bit 10 through the plug 9, the piston 5 moves to the drill bit 10 direction, the piston 5 is pulled by the steel wire, extruding the resin anchoring agent 7 (the end buckle of the anchoring agent is removed in advance, which can be easily broken), the anchoring agent flows out through the slurry outlet at the plug position and is anchored after stirring through the rod body;

[0046] 4) Pre-tightening: after waiting for a period of time, drive the hydraulic motor to rotate reversely, at this time, since the rod body has been anchored, the hexagonal nut 3 cannot rotate the rod body and is forced to rotate along the rod body, realizing the pre-tightening function (since there is no activity space between the hexagonal nut and the rock wall, during the process of rotating the nut, it is similar to pulling the rod body outward, after the rod body hits the end of the drill sleeve, it will force the equipment to move and create space, or the drilling machine can be moved backward to create pre-tightening space in advance).

Claims

1. A one-step hollow self-drilling mine anchor rod, characterized in that: The hollow rod body, the self-locking mechanism arranged at the tail end of the hollow rod body, the drilling structure arranged at the head of the hollow rod body, the piston, the steel wire and the resin anchoring agent arranged in the inner cavity of the anchoring segment of the hollow rod body, the plug and the drill bit, the one-way ratchet teeth arranged on the mating surface of the plug and the drill bit, and the connection of the two ends of the steel wire with the piston and the plug.

2. The one-step hollow self-drilling rock anchor rod according to claim 1, characterized in that: Two pawls are arranged outside the plug.

3. The one-step hollow self-drilling rock bolt according to claim 1, characterized in that: The slurry outlet hole is arranged on the base body of the plug.

4. The one-step hollow self-drilling rock bolt according to claim 1, characterized in that: The piston comprises a hollow silk tube and two sealing rings sleeved on the hollow silk tube, a spacing column is arranged between the two sealing rings, a fastening nut is arranged outside each of the two sealing rings, an end cover is arranged at the end of the hollow silk tube, and a spring is arranged between the end cover and the fastening nut.

5. The one-step hollow self-drilling rock bolt according to claim 1, characterized in that: The hollow rod body is a seamless steel pipe, and the exposed end is processed with left-handed wave threads, and the anchoring segment is a seamless steel pipe.

6. The one-step hollow self-drilling rock bolt according to claim 1, characterized in that: The drilling part of the drill bit is embedded with a hard alloy piece.

7. The one-step hollow self-drilling rock bolt according to claim 1, characterized in that: The self-locking mechanism is a double-nut self-locking mechanism, comprising a self-locking nut and a hexagonal nut.

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