Mine anchor cable pressure air quantitative squeezing device and precise anchoring method

Abstract

The present invention discloses a device for quantitative air pressure injection and precise anchoring of mining anchor cables, which are applicable to the field of surrounding rock support engineering in coal mine tunnels. It comprises a pneumatic double-rod cylinder, a canned bottle and a mixer. The wind direction control valve in the pneumatic double-rod cylinder is used to adjust the forward and backward movement direction of the guide rod, driving the canned bottle to realize the functions of slurry discharge and removal. Under the action of wind pressure, the two-component adhesive in the canned bottle is continuously squeezed out. After being fully stirred by the mixer, the adhesive is continuously transported to the slurry outlet at the end of the anchor cable, and then the anchoring length is designed according to the pre-measured surrounding rock crack position to further realize the precise anchoring of the anchor cable. Each borehole corresponds to a group of canned bottles, which is convenient for underground construction, and the canned bottle capacity is set according to the overall situation of the tunnel, which is conducive to achieving precise bonding in specific crack areas, making full use of the rare compressed air power source underground, easy to operate, and highly applicable.

Description

Technical Field

[0001] The present invention relates to a device for quantitatively squeezing and injecting air into a mining anchor cable and a precise anchoring method, and is particularly applicable to the field of surrounding rock support engineering in coal mine tunnels. Background Art

[0002] Bolt cable anchoring technology can significantly improve rock strength and stratum integrity, and has become the main technical means to control the stability of surrounding rock in coal mine tunnels.

[0003] Current anchoring technology mainly relies on resin anchors to bond the anchor cable body to the surrounding rock. The resin anchor is packaged by separating the mastic and curing agent with a special polyester film. Only by fully mixing the mastic and curing agent can the bonding strength between the resin anchor and the surrounding rock be optimized. Nowadays, anchor drilling rigs are commonly used to drive the anchor cable to rotate and stir the polyester film, thereby allowing the cement and curing agent to mix. This method has three major disadvantages: (1) Due to the presence of polyester film, there will be weak surfaces after the cement and curing agent are mixed and hardened, which reduces the bonding strength to a certain extent; (2) When the surrounding rock is relatively broken or the drilling hole is not well formed, the resin anchor will be stuck and cannot be pushed to the bottom of the hole, resulting in discontinuous anchoring of the resin anchor when anchoring the surrounding rock, and insufficient mixing, resulting in reduced anchoring force; (3) The anchoring length formed by the mixing of the resin anchor is limited, generally only able to achieve end anchoring and extended anchoring. For some weak surrounding rock or water-rich surrounding rock tunnels, this anchoring method has the risk of insufficient anchoring strength and requires full-length anchoring. However, the anchor drilling rig capacity is insufficient, and using too much anchor will result in insufficient mixing or premature hardening of the anchor. The above three problems directly affect the stability control effect of the tunnel surrounding rock, and in serious cases, tunnel collapse and other problems may occur.

[0004] In recent years, there have been some explorations in the field of anchoring reliability technology. In order to achieve a full mix of the clay and curing agent in the resin anchor, patent CN111927514B proposed a prestressed full-length anchoring method with the addition of steel sand by the post-injection method. The mixing degree of the resin anchor is improved by adding small-particle steel sand into the borehole, but the construction process is very complicated, which seriously restricts the construction efficiency of the anchor cable. Patent CN103161484B proposed a paste fixed-length anchoring support method, which completely eliminated the anchoring method of the anchoring agent. A plastic hose is placed in the borehole, and a grouting pump is used to inject the prepared paste slurry into the borehole through the plastic hose. The anchor cable is then inserted into the borehole. Although this method achieves full-length anchoring and improves the control effect, the construction process is still relatively complicated. In order to achieve control of weak surrounding rock tunnels, full-length anchoring technology has become a trend, but full-length anchoring completely closes the free section of the anchor cable, making the surrounding rock lack the buffering and pressure-relieving properties. Therefore, there is an urgent need for a method for accurately anchoring an anchor cable and a squeezing device for achieving rapid and accurate anchoring. Summary of the Invention

[0005] Technical problem: The purpose of the present invention is to overcome the shortcomings of the existing technology and propose a device for quantitative squeezing of mine anchor cables with compressed air and a precise anchoring method. The device has a simple structure and is convenient for use in narrow spaces in tunnels. The precise anchoring method formed by the device improves the reliability of the anchoring system and the construction efficiency of the anchor cables, and the technical effect is significant.

[0006] and a tube connecting the discharging opening of the pump with a check valve in it at the pump end, and a check valve in it at the pump end, the tube connecting the discharging opening of the pump with a check valve in it at the pump end, and a check valve in it at the pump end. The air is sent to the wind direction control valve. When the guide rod is pushed, the air is sent into the air bin I through the inner air pipe II by the air direction control valve, pushing the guide rod to squeeze the canned bottle; when the guide rod is to be retracted, the air is sent to the inner air pipe III by the air direction control valve to enter the air bin II, thereby pushing the guide rod in the opposite direction to achieve the effect of ventilation; the canned bottle includes a detachable canned bottle I and a detachable canned bottle II, which are respectively filled with material A and material B that can form a binder after mixing. The detachable canned bottle I and the detachable canned bottle II are arranged in the canned bottle storage bin. The tails of the detachable canned bottle I and the detachable canned bottle II are respectively connected to a guide rod for squeezing out the material. The discharge ports of the detachable canned bottle I and the detachable canned bottle II are respectively connected to the mixer through the slurry outlet. The mixer includes a mixing and stirring part. The inlet of the mixing and stirring part is respectively connected to the slurry outlet through a plastic slurry inlet pipe. The outlet of the mixing and stirring part is provided with a connector through the slurry outlet pipe. A roller is provided in the mixing and stirring part, and a cross-shaped plastic fan blade is provided on the roller.

[0007] A mining anchor cable has a grouting channel provided in the anchor cable body for discharging slurry from the end. The slurry outlet of the anchor cable body is arranged on the side of the anchor cable end. The anchor cable body is designed without an anchoring section and does not require an anchoring section blocking structure.

[0008] Furthermore, according to the requirements of the anchoring length, a sealing structure is provided on the anchor cable body to realize fixed-length grouting and limit the flow of slurry. The sealing structure is used to limit the slurry injected into the end of the anchor cable to the drilling space between the sealing structure and the bottom of the borehole, thereby realizing fixed-length grouting anchoring without anchoring agent. The sealing structure includes slurry-stopping cotton or an expansion air bag that expands rapidly when it comes into contact with water.

[0009] Furthermore, the grouting channel is a hollow grouting steel pipe arranged inside the anchor cable, the outer diameter of the anchor cable hollow grouting steel pipe is 7 to 9 mm, and the inner diameter is 4 to 6 mm; the grouting channel is a circular hollow channel arranged inside the anchor rod, and the inner diameter of the anchor rod circular hollow channel is 4 to 6 mm.

[0010] A method for rapid fixed-length grouting of a mining anchor cable comprises the following steps: setting an anchor cable drill hole in an area where anchor cable support is required, placing the mining anchor cable provided with a grouting channel and an end grouting outlet into the anchor cable drill hole, then grouting is performed through the grouting channel on the anchor cable body, and installing a tray and a fastening nut at the tail end of the anchor cable after the slurry solidifies.

[0011] Furthermore, according to the position of the surrounding rock fracture zone detected in advance, a sealing structure is installed at the corresponding position of the anchor cable in the grouting hole, and the generation of the grouting section is controlled by the sealing structure. The mining anchor cable is placed in the drill hole together with the sealing structure. Then, the anchor cable is grouted in a fixed quantity and length through the grouting channel and the grouting outlet using a grouting device. After waiting for the slurry to solidify, a tray and a fastening nut are installed at the tail end of the anchor cable body.

[0012] Furthermore, a rubber plug is provided at the tail end of the anchor cable, and the anchor cable together with the rubber plug, tray, nut or lock is pushed into the drill hole, and then the anchor cable is quickly grout-anchored along its entire length using a grouting device. After the slurry solidifies, the installation of the anchor cable is completed without applying pre-tightening force.

[0013] A precise anchoring method for a compressed air quantitative squeezing device for a mining anchor cable, wherein the material bottles A and B, which will form a binder for fixed-length grouting after mixing, are precisely and quantitatively filled according to the requirements of a single anchoring borehole in the area, so that the canned bottles of binder form an optimal grouting amount suitable for anchoring in the geological area. The staff only needs to install the precisely and quantitatively filled canned bottles into the grouting equipment and inject all of them into the anchor rod to complete the precise and quantitative grouting. The steps are simple, and there will be no operational errors. In addition, the anchoring effect formed after the precise grouting is the best.

[0014] The specific steps are as follows:

[0015] S1. To efficiently and quickly control roadway deformation, precise anchoring to weak surrounding rock or crack development locations is required: Exploring the distribution of cracks in the surrounding rock of coal mine roadways, designing roadway support methods and hollow anchor cable length L', and obtaining the hollow anchor cable anchor length L based on the crack distribution, specifically the length from the bottom of the borehole to the crack layer. At this point, the required binder volume V for grouting is calculated as:

[0016] V=1 / 4π(D 2 -D' 2 )L+1 / 4πd 2 L'

[0017] Where D is the borehole diameter, D' is the anchor cable diameter, and d is the diameter of the hollow anchor cable hollow tube;

[0018] S2. Based on the volume V of grouting binder required for each drill hole, the required amount of material A and material B required to produce the volume V of binder after the filling components are combined with each other is calculated, and the two mixtures are respectively filled into removable cans I and removable cans II, ensuring that the guide rods synchronously squeeze removable cans I and removable cans II, and the two mixtures are extruded from the slurry outlet with the required binder ratio maintained;

[0019] S3. Drill holes corresponding to the hollow anchor cables at predetermined locations according to the support plan. Install the hollow anchor cables, trays, and nuts, or the hollow anchor cables, trays, and locks, in place in advance. Use the drill to push the nuts or locks to move the hollow anchor cables into the holes, while keeping the drill stationary.

[0020] S4. Connect the air inlet of the quantitative squeezing device to the air duct in the tunnel, and then connect the connector of the quantitative squeezing device to the tail end of the hollow anchor cable.

[0021] S5. Use the wind direction control valve in the quantitative extrusion device to control the guide rod to move forward under the action of compressed air. The gas is discharged from the air outlet I. The material A and material B in the detachable cans I and detachable cans II are squeezed into the mixer by the guide rod at the same time. The two slurries react with each other at the entrance of the mixing and stirring section. As the guide rod continues to move forward, the mixed adhesive passes through two cross-shaped plastic fan blades in sequence, driving the roller to rotate together, so that the adhesive is fully mixed. The adhesive is then transported to the bottom of the hollow anchor cable hole through the plastic slurry outlet pipe. The adhesive then flows along the hole wall to the specific fracture area, achieving precise anchoring of the anchor cable.

[0022] S6. Use the wind direction control valve in the quantitative squeezing device to control the retraction of the guide rod, and the gas is discharged from the air outlet II. Remove the cans of adhesive No. I and No. II. After the guide rod returns to its original position, install the next set of cans and prepare for the anchoring of the next anchor cable.

[0023] S7. After one production shift is completed, the mixer can be dismantled and replaced.

[0024] 10. The precise anchoring method according to claim 9, characterized in that the total amount of material A and material B filled in the detachable cans I and II is to meet the total demand for anchor grouting in the entire tunnel, assuming that the amount of anchoring adhesive in each drill hole is the same, and the diameter d' of the cans is known, the total length of the cans is calculated as l = 4kV / (d 2 π), where k is the richness coefficient, the length of a single canning bottle l'=1 / 2l, the slurries of material A and material B are respectively put into two canning bottles, and the moving distance of the guide rod each time the anchor rope is injected is calculated according to the injection amount.

[0025] Beneficial effects:

[0026] ① The cans can be personalized, achieving a one-lane-one-policy solution. The anchoring position of the anchor cable can be designed according to the location of the crack development, thereby accurately obtaining the required volume of adhesive and customized length of the cans. The raw materials in the detachable cans can be fixed to one set for each drill hole, eliminating the need for staff to calculate and facilitating operation. Alternatively, they can be set according to the total number of lanes, with a predetermined amount of adhesive slurry pressed in each time.

[0027] ② The setting time of the binder is adjustable, and accurate reinforcement of hollow anchor cables under different surrounding rock conditions can be achieved according to demand;

[0028] ③ It overcomes the drawbacks of uneven mixing of anchoring agents and low anchoring quality during the mixing of traditional anchor cables, and does not require resin anchoring agents for end anchoring. Construction can be completed with one grouting and anchoring.

[0029] ④ Make full use of the rare compressed air power source underground to facilitate operation and construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the mining anchor cable pressure air quantitative squeezing device of the present invention;

[0031] Figure 2 This is a cross-sectional schematic diagram of a pneumatic double-rod cylinder of a mine anchor cable air pressure quantitative squeezing device of the present invention;

[0032] Figure 3 Schematic diagram of the wind direction control valve of the mine anchor cable pressure air quantitative squeezing device of the present invention at gear O;

[0033] Figure 4 This is a schematic diagram of the wind direction control valve in gear A of the mine anchor cable pressure air quantitative squeezing device of the present invention;

[0034] Figure 5 Schematic diagram of the wind direction control valve of the mine anchor cable pressure air quantitative squeezing device of the present invention in gear B;

[0035] Figure 6 This is a schematic diagram of the forward movement of the guide rod of the pneumatic double-rod cylinder in gear A of the mine anchor cable pressure air quantitative squeezing device of the present invention;

[0036] Figure 7 Schematic diagram of the guide rod retraction of the pneumatic double-rod cylinder in gear B of the mining anchor cable pressure air quantitative squeezing device of the present invention;

[0037] In the figure: 1 ~ pneumatic double-rod cylinder, 1-1 ~ air inlet, 1-2 ~ wind direction control valve, 1-3 ~ pressure gauge, 1-4 ~ guide rod, 1-5 ~ canned bottle storage bin, 1-6 ~ air outlet I, 1-7 ~ air outlet II, 1-8 ~ wind warehouse I, 1-9 ~ wind warehouse II, 1-10 ~ inner air pipe I, 1-11 ~ inner air pipe II, 1-12 ~ inner air pipe III, 2 ~ canned bottle, 2-1 ~ detachable canned bottle I, 2-2 ~ detachable canned bottle II, 3 ~ mixer, 3-1 ~ plastic slurry inlet pipe, 3-2 ~ mixing and stirring part, 3-3 ~ roller, 3-4 ~ cross-shaped plastic fan blade, 3-5 ~ plastic slurry outlet pipe, 3-6 ~ connector. DETAILED DESCRIPTION

[0038] The embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0039] like Figure 1 、 Figure 2 As shown, a device for quantitative squeezing of an anchor cable with compressed air for mining of the present invention comprises an extrusion grouting device, in which a canned bottle 2 is installed, and the extrusion grouting device comprises a pneumatic double-rod cylinder 1 arranged behind the canned bottle 2, and an end portion of the extrusion grouting device is provided with a mixer 3 connected to the discharge port of the canned bottle 2 for mixing multiple materials, and the mixer 3 outputs the mixed material; the pneumatic double-rod cylinder 1 of the extrusion grouting device comprises guide rods 1-4 and an air bin for driving the guide rods 1-4, the number of the guide rods 1-4 matches the number of the canned bottles 2, and the bottom of the guide rods 1-4 It is a piston placed in the wind bin, wherein the rodless chamber of the wind bin is wind bin I 1-8, and the rod chamber is wind bin II 1-9. A pressure gauge 1-3 is connected to wind bin I 1-8. An air inlet 1-1 and an air outlet II 1-7 are provided on the side of wind bin I 1-8. An air outlet I 1-6 is provided on the side of wind bin II 1-9. A wind direction control valve 1-2 is also provided on the wind bin. The wind direction control valve 1-2 is connected to the inner air pipe I 1-10, the inner air pipe II 1-11 and the inner air pipe III 1-12 respectively. The inner air pipe I 1-10 is the air inlet pipe, which sends air from the air inlet 1-1 to the wind direction control valve 1-2.

[0040] When the guide rod 1-4 is pushed, the air is transported to the inner air pipe II 1-11 and into the air bin I 1-8 by the wind direction control valve 1-2, and the guide rod 1-4 moves forward; when the guide rod 1-4 is to be retracted, the air is transported to the inner air pipe III 1-12 and into the air bin II 1-9 by the wind direction control valve 1-2, thereby achieving the function of ventilation. The canned bottle 2 includes a detachable canned bottle I 2-1 and a detachable canned bottle II 2-2, which are respectively filled with material A and material B which can form a binder after mixing. The detachable canned bottle I 2-1 and the detachable canned bottle II 2-2 are arranged in the canned bottle storage bin 1-5. The detachable canned bottle The tail of Ⅰ2-1 and the detachable canned bottle Ⅱ2-2 are respectively connected to a guide rod 1-4 for squeezing out the material. The discharge ports of the detachable canned bottle Ⅰ2-1 and the detachable canned bottle Ⅱ2-2 are respectively connected to the mixer 3 through the slurry outlet 2-3. The mixer 3 includes a mixing and stirring part 3-2. The inlet of the mixing and stirring part 3-2 is respectively connected to the slurry outlet 2-3 through a plastic slurry inlet pipe 3-1. The outlet of the mixing and stirring part 3-2 is provided with a connector 3-6 through a slurry outlet pipe 3-5. A roller 3-3 is provided in the mixing and stirring part 3-2, and a cross-shaped plastic fan blade 3-4 is provided on the roller 3-3.

[0041] like Figure 3 、 Figure 4 and Figure 5 As shown, the wind direction control valve 1-2 control valve includes O gear, A gear and B gear. In O gear, the internal air pipe I1-10 is closed, in A gear, the internal air pipe I1-10 is connected to the internal air pipe II1-11, and in B gear, the internal air pipe I1-10 is connected to the internal air pipe III1-12.

[0042] A mining anchor cable, wherein the anchor cable body is provided with a grouting channel for discharging slurry from the end portion, and the slurry outlet of the anchor cable body is arranged on the side of the anchor cable end portion. The anchor cable body is designed without an anchoring section, and does not require an anchoring section sealing structure. According to the requirements of the anchoring length, a sealing structure is provided on the anchor cable body to implement fixed-length grouting and restrict the flow of slurry. The sealing structure is used to restrict the slurry injected into the end portion of the anchor cable to the borehole space above the sealing structure, thereby achieving fixed-length grouting anchoring. The sealing structure includes slurry-stopping cotton or an expansion airbag that expands rapidly when exposed to water. The grouting channel is a hollow grouting steel pipe arranged inside the anchor cable, with an outer diameter of 7 to 9 mm and an inner diameter of 4 to 6 mm; the grouting channel is a circular hollow channel arranged inside the anchor rod, with an inner diameter of 4 to 6 mm.

[0043] A method for rapid, fixed-length grouting of a mining anchor cable comprises: setting an anchor cable borehole in an area where anchor cable support is required, inserting a mining anchor cable equipped with a grouting channel and an end grouting outlet into the anchor cable borehole, then grouting is performed through the grouting channel on the anchor cable body. After the slurry solidifies, a tray and a fastening nut are installed at the tail end of the anchor cable body. A sealing structure is installed based on the location of a pre-detected surrounding rock fracture zone, and the sealing structure controls the location of subsequent grouting. The anchor cable, along with the sealing structure, is placed in the borehole, and a grouting device is then used to perform quantitative, fixed-length grouting of the anchor cable through the grouting channel and the grouting outlet. After the slurry solidifies, a tray and a fastening nut are installed at the tail end of the anchor cable body. A rubber plug is provided at the tail end of the anchor cable, and the anchor cable, along with the rubber plug, tray, nut, or lock, is pushed into the borehole. The grouting device is then used to rapidly and fully grout the anchor cable. After the slurry solidifies, the anchor cable is installed without the need for applying a preload.

[0044] A precise anchoring method for a mine anchor cable compressed air quantitative squeezing device accurately and quantitatively fills the adhesive for fixed-length grouting according to regional requirements, so that the canned bottle of adhesive forms the optimal grouting amount suitable for anchoring in the geological area. The staff only needs to install the canned bottle with precise quantitative filling into the grouting equipment and inject it completely to complete the precise quantitative grouting. The steps are simple and there will be no operational errors. In addition, the anchoring effect formed after precise grouting is the best.

[0045] The specific steps are as follows:

[0046] S1. To better control roadway deformation, precise anchoring is required to weak surrounding rock or crack development locations: explore the distribution of cracks in the surrounding rock of coal mine roadways, design the roadway support method and the hollow anchor cable length L'. Based on the crack distribution, the hollow anchor cable anchor length L is obtained, specifically the length from the bottom of the drill hole to the crack layer. At this time, the required grouting binder volume V is calculated as:

[0047] V=1 / 4πD 2 -D' 2 L+1 / 4πd 2 L'

[0048] Where D is the borehole diameter, D' is the anchor cable diameter, and d is the diameter of the hollow anchor cable hollow tube;

[0049] S2. Based on the volume V of grouting binder required for each drill hole, determine the filling composition of material A and material B that, when combined, produce the volume V of binder, and fill the two mixtures into detachable canning bottle I2-1 and detachable canning bottle II2-2, respectively. Ensure that the guide rods 1-4 synchronously squeeze the detachable canning bottle I2-1 and the detachable canning bottle II2-2 so that the two extruded mixtures maintain the required binder ratio;

[0050] S3. Drill holes corresponding to the hollow anchor cables at predetermined locations according to the support plan. Install the hollow anchor cables, trays, and nuts, or the hollow anchor cables, trays, and locks, in place in advance. Use the drill to push the nuts or locks to move the hollow anchor cables into the holes, while keeping the drill stationary.

[0051] S4. Connect the air inlet 1-1 of the quantitative squeezing device to the air duct in the tunnel, and then connect the connector 3-6 of the quantitative squeezing device to the tail end of the hollow anchor cable.

[0052] S5. Use the wind direction control valve 1-2 in the quantitative extrusion device to control the guide rod 1-4 to move forward under the action of compressed air. The gas is discharged from the air outlet I1-6. The material A and material B in the detachable canned bottle I2-1 and the detachable canned bottle II2-2 are simultaneously pumped into the mixer 3. The two slurries react with each other at the inlet of the mixing and stirring section 3-2. As the guide rod 1-4 continues to move forward, the mixed adhesive passes through the two cross-shaped plastic fan blades 3-4 in sequence, driving the roller 3-3 to rotate together, so that the adhesive is fully mixed. The adhesive is then transported to the bottom of the hollow anchor cable hole through the plastic slurry outlet pipe 3-5. Thereafter, the adhesive flows along the hole wall to the specific fracture area, achieving precise anchoring of the anchor cable.

[0053] S6. Use the wind direction control valve 1-2 in the quantitative squeezing device to control the guide rod 1-4 to retract, and the gas is discharged from the air outlet II 1-7. Remove the cans of adhesive No. I and No. II. After the guide rod 1-4 returns to its original position, install the next set of cans 2 and prepare to anchor the next anchor cable. Figure 6 and Figure 7 As shown;

[0054] S7. After one production shift is completed, the mixer 3 is disposed of.

[0055] The material A and material B filled in the removable cans Ⅰ2-1 and detachable cans Ⅱ2-2 are the sum of the anchor grouting in a section of the tunnel. Assuming that the amount of anchor adhesive in each borehole is the same, and the diameter d' of the cans is known, the total length of the can 2 is l = 4kV / (d 2 π), where k is the richness coefficient, the length of a single canning bottle l'=1 / 2l, the slurries of material A and material B are respectively loaded into two canning bottles, and the moving distance of the guide rods 1-4 each time the anchor rope is injected is calculated according to the injection amount.

Claims

1. A device for quantitative squeezing of air-pressured anchor cables for mining, characterized by: The invention comprises an extrusion grouting device, wherein a canned bottle (2) is installed in the extrusion grouting device, the extrusion grouting device comprises a pneumatic double-rod cylinder (1) arranged behind the canned bottle (2), an end of the extrusion grouting device is provided with a mixer (3) connected to the discharge port of the canned bottle (2) for mixing multiple materials, and the mixer (3) outputs the mixed material; the pneumatic double-rod cylinder (1) of the extrusion grouting device comprises a guide rod (1-4) and an air bin for driving the guide rod (1-4), the number of the guide rods (1-4) matches the number of the canned bottles (2), the bottom of the guide rod (1-4) is a piston placed in the air bin, wherein the rodless cavity of the air bin is air bin I (1-8), and the rod cavity The air chamber is composed of two parts, namely, the air chamber II (1-9). The air chamber I (1-8) is connected to a pressure gauge (1-3). The air chamber I (1-8) is provided with an air inlet (1-1) and an air outlet II (1-7). The air chamber II (1-9) is provided with an air outlet I (1-6). The air chamber is also provided with an air direction control valve (1-2). The air direction control valve (1-2) is respectively connected to an inner air pipe I (1-10), an inner air pipe II (1-11) and an inner air pipe III (1-12). The inner air pipe I (1-10) is an air inlet pipe, which sends air from the air inlet (1-1) to the air direction control valve (1-2). When the guide rod (1-4) is pushed, the air is passed through the air direction control valve (1-2). The inner air pipe II (1-11) is sent into the wind bin I (1-8), pushing the guide rod (1-4) to squeeze the canned bottle (2); when the guide rod (1-4) is to be retracted, the air is sent to the inner air pipe III (1-12) by the air direction control valve (1-2) and enters the wind bin II (1-9), thereby pushing the guide rod (1-4) in the reverse direction to achieve the function of ventilation; the canned bottle (2) includes a detachable canned bottle I (2-1) and a detachable canned bottle II (2-2), which are respectively filled with material A and material B that can form a binder after mixing. The detachable canned bottle I (2-1) and the detachable canned bottle II (2-2) are arranged in the canned bottle storage bin (1-5), and the detachable canned bottle I (2-1) and the detachable canned bottle II (2-2) are respectively placed in the canned bottle storage bin (1-5). The tail of the unloading canning bottle II (2-2) is respectively connected to a guide rod (1-4) for extruding the material. The discharge ports of the detachable canning bottle I (2-1) and the detachable canning bottle II (2-2) are respectively connected to the mixer (3) through the slurry outlet (2-3). The mixer (3) includes a mixing and stirring part (3-2). The inlet of the mixing and stirring part (3-2) is respectively connected to the slurry outlet (2-3) through a plastic slurry inlet pipe (3-1). The outlet of the mixing and stirring part (3-2) is provided with a connector (3-6) through a slurry outlet pipe (3-5). A roller (3-3) is provided in the mixing and stirring part (3-2), and a cross-shaped plastic fan blade (3-4) is provided on the roller (3-3).

2. The device for quantitative injection of compressed air into mining anchor cables according to claim 1, characterized in that: In the mining anchor cable used, a grouting channel is provided in the anchor cable body for realizing slurry discharge from the end. The slurry outlet of the anchor cable body is arranged on the side of the anchor cable end. The anchor cable body is designed without an anchoring section and does not require an anchoring section sealing structure.

3. The device for quantitative squeezing of an anchor cable using compressed air according to claim 2, characterized in that: According to the requirements of the anchoring length, a sealing structure is provided on the anchor cable body to realize fixed-length grouting and limit the flow of slurry. The sealing structure is used to limit the slurry injected into the end of the anchor cable to the drilling space between the sealing structure and the bottom of the borehole, thereby realizing fixed-length grouting anchoring without anchoring agent. The sealing structure includes slurry-stopping cotton or an expansion air bag that expands rapidly when exposed to water.

4. The device for quantitative squeezing of anchor cables with compressed air according to claim 2 is characterized in that: The grouting channel is a hollow grouting steel pipe arranged inside the anchor cable, the outer diameter of the anchor cable hollow grouting steel pipe is 7~9mm, and the inner diameter is 4~6mm; the grouting channel is a circular hollow channel arranged inside the anchor rod, and the inner diameter of the anchor rod circular hollow channel is 4~6mm.

5. The mining anchor cable pressure air quantitative squeezing device according to claim 3 is characterized in that: The method for rapid fixed-length grouting of mining anchor cables is as follows: an anchor cable drill hole is set in the area where anchor cable support is required, and then the mining anchor cable with a grouting channel and an end slurry outlet is placed into the anchor cable drill hole, and then grouting is carried out through the grouting channel on the anchor cable body. After the slurry solidifies, a tray and a fastening nut are installed at the tail end of the anchor cable.

6. The mining anchor cable pressure air quantitative squeezing device according to claim 3, characterized in that: In the rapid fixed-length grouting method: according to the position of the surrounding rock fracture zone detected in advance, a sealing structure is installed at the corresponding position of the anchor cable in the grouting hole, and the generation of the grouting section is controlled by the sealing structure. The mining anchor cable together with the sealing structure is placed in the drill hole. Then, the anchor cable is grouted in a quantitative and fixed length through the grouting channel and the grouting outlet using a grouting device. After the slurry solidifies, a tray and a fastening nut are installed at the tail end of the anchor cable body.

7. The device for quantitative squeezing of anchor cables with compressed air for mining use according to claim 3, characterized in that: In the rapid fixed-length grouting method: a rubber plug is provided at the tail end of the anchor cable, and the anchor cable together with the rubber plug, tray, nut or lock is pushed into the drill hole, and then the anchor cable is quickly grout-anchored along its entire length using a grouting device. After the slurry solidifies, the installation of the anchor cable is completed without applying pre-tightening force.

8. A precise anchoring method using the mining anchor cable pressure-air quantitative squeezing device according to any one of claims 1 to 7, characterized in that: The material bottles of material A and material B, which will form the adhesive for fixed-length grouting after mixing, are accurately and quantitatively filled according to the requirements of a single anchoring borehole in the anchoring area, so that the canned bottle (2) of the adhesive forms the best grouting amount suitable for the anchoring in the geological area. The staff only needs to install the accurately and quantitatively filled canned bottle (2) into the grouting equipment and complete the accurate and quantitative grouting after all the canned bottles are injected into the anchor rod; the specific steps are as follows: S1. In order to control the deformation of the roadway efficiently and quickly, it is necessary to accurately anchor the roadway to the weak surrounding rock or the location of the crack development: explore the distribution of cracks in the surrounding rock of the coal mine roadway, design the roadway support method and the length of the hollow anchor cable L', and obtain the anchoring length of the hollow anchor cable according to the crack distribution. L , specifically the length from the bottom of the borehole to the layer where the crack is located, at this time calculate the volume of binder required for grouting V for: V =1 / 4π( D 2 -D' 2 ) L +1 / 4πd 2 The in D is the borehole diameter, D' is the anchor cable diameter, d is the diameter of the hollow tube of the hollow anchor cable; S2, according to the volume of grouting binder required for each drill hole V， The volume generated by the combination of filling components V The required amount of material A and material B of the binder is determined, and the two mixed materials are respectively filled into the detachable canning bottle I (2-1) and the detachable canning bottle II (2-2), and the guide rod (1-4) is ensured to synchronously squeeze the detachable canning bottle I (2-1) and the detachable canning bottle II (2-2) so that the two mixed materials maintain the required ratio of the binder and are squeezed out from the slurry outlet (2-3); S3. Drill holes corresponding to the hollow anchor cables at predetermined locations according to the support plan. Install the hollow anchor cables, trays, and nuts, or the hollow anchor cables, trays, and locks, in place in advance. Use the drill to push the nuts or locks to move the hollow anchor cables into the holes, while keeping the drill stationary. S4, connecting the air inlet (1-1) of the quantitative squeezing device to the air duct in the tunnel, and then connecting the connector (3-6) of the quantitative squeezing device to the tail end of the hollow anchor cable; S5. The wind direction control valve (1-2) in the quantitative extrusion device is used to control the guide rod (1-4) to move forward under the action of the compressed air. The gas is discharged from the air outlet I (1-6). The material A and the material B in the detachable canned bottle I (2-1) and the detachable canned bottle II (2-2) are squeezed into the mixer (3) by the guide rod (1-4) at the same time. The two slurries react with each other at the entrance of the mixing and stirring part (3-2). As the guide rod (1-4) continues to move forward, the mixed adhesive passes through the two cross-shaped plastic fan blades (3-4) in turn, driving the roller (3-3) to rotate together, so that the adhesive is fully mixed. Then, the adhesive is transported to the bottom of the hollow anchor cable hole through the plastic slurry outlet pipe (3-5). Thereafter, the adhesive flows along the hole wall to the specific crack area, thereby realizing the precise anchoring of the anchor cable. S6. Use the wind direction control valve (1-2) in the quantitative squeezing device to control the guide rod (1-4) to retract, and the gas is discharged from the air outlet II (1-7). Remove the cans of adhesive No. I and No. II. After the guide rod (1-4) returns to its original position, install the next set of cans (2) and prepare to anchor the next anchor cable. S7. After one production shift is completed, the mixer (3) can be dismantled and replaced.

9. The precise anchoring method according to claim 8, characterized in that: The total amount of material A and material B filled in the removable cans Ⅰ (2-1) and removable cans Ⅱ (2-2) is to meet the total demand for anchor grouting in the entire tunnel. Assuming that the amount of anchor adhesive in each borehole is the same and the diameter d' of the cans is known, calculate the total length of the cans (2) l =4k V / (d' 2 π), where k is the richness coefficient, the length of a single canned bottle l '=1 / 2 l , put the slurry of material A and material B into two cans respectively, and the moving distance of the guide rod (1-4) is calculated according to the injection volume each time the anchor rope is injected.

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