WO2014079276A1

WO2014079276A1 - Field emulsion explosive mixing and charging system and charging method suitable for underground engineering

Info

Publication number: WO2014079276A1
Application number: PCT/CN2013/084409
Authority: WO
Inventors: 周桂松; 安振伟; 陈曦; 张小勇; 邓小英; 李名松; 万红彬; 仲峰; 朱根华
Original assignee: 葛洲坝易普力股份有限公司
Priority date: 2012-11-22
Filing date: 2013-09-27
Publication date: 2014-05-30

Abstract

A field emulsion explosive mixing and charging system and charging method suitable for underground engineering. A drug outlet of a mixing machine is connected with a drug inlet end of a drug conveying pump, the drug outlet end of the drug conveying pump is communicated with a drug conveying hose through a water ring adding device, a mixing shaft is arranged in a drug mixing cavity of a mixing machine shell, a premixing chamber is formed above the feeding hole of the mixing machine shell, a drug spray device is arranged at the drug outlet end of the drug conveying hose, a spray head of the drug spray device is a cylindrical structure, and the spray head is provided with a main drug spray hole along the axial line of the spray head. The aim of ensuring the explosion effect is fulfilled mainly through technical innovations on three aspects: I, the pre-mixing chamber is formed on the top of the mixing machine shell; II, the sensitizing way of the emulsion explosive is physical sensitization; and III, the drug spray device is additionally arranged at the upper end of the drug conveying hose. Meanwhile, specific to the aim of lowering the working pressure of the drug conveying pump, a shearing device arranged on the drug conveying hose and used for increasing the viscosity of the emulsion explosive in the prior art is eliminated.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of explosive mixed charge for underground engineering, and more particularly to an in-situ mixing of an emulsion explosive suitable for underground engineering. Mixing system and charging method. BACKGROUND OF THE INVENTION Underground engineering (such as underground mines) mostly adopts a bottomless sublevel caving method, and the blastholes are arranged in a fan-shaped arrangement. Traditionally, it is mainly used as an ammonic explosive charge or a car for charging. The principle of the charge is to use the powder (or granular) ammonium fryer to have good dispersibility, and it is wrapped with explosive powder by compressed air, and It is blown into the blasthole. The traditional method of charging has problems such as high drug return rate, high air pollution, low packing density, and poor blasting effect. At the same time, because the main component of ammonium explosives has strong water absorption, ammonium oil explosives are not suitable for the charging of water-containing blastholes, especially for large-scale underground mine charging blasting. Moreover, if the ammonium explosive stays in the blasthole for a long time, the explosive performance of the ammonium explosive will be greatly affected, and even a blind cannon phenomenon will occur. Because the loaded emulsion explosive has the advantages of high charge density, good blasting effect and less toxic gas after explosion, it has gradually become the development direction of underground mine charge. One way to load emulsion explosives is to transport the emulsion explosives processed into the factory to the blasting site and then manually load the blastholes. There are two main drawbacks to this method:

1. The safety of the emulsion explosive during transportation is low, and it is prone to explosion and other safety accidents. 2. For the upper blasthole, the depth of the blasthole is large (the maximum depth can reach more than 30m), not only labor intensity, but also The difficulty of the medicine is even greater. In the process of charging, it is inevitable that the phenomenon of "click hole" or the charge is not in place, and the blasting effect is difficult to guarantee. Another way is to transport the raw materials or semi-finished products (such as water phase, oil phase, sensitizer, latex matrix, dry material, etc.) that make up the emulsion explosive to the blasting site, and then use the mixed explosive vehicle (or mobile). The explosive manufacturing module can be transported to the blasting site by a transportation device such as a truck when it is used. The raw materials or semi-finished products constituting the emulsion explosive are mixed and then transported into the blasthole. Since the risk factor of the raw materials or semi-finished products constituting the emulsion explosives is low, the above-mentioned on-site mixed emulsion explosives can greatly reduce the danger during the transportation of the explosives. Therefore, various kinds of emulsion explosives are mixed at home and abroad. Mixing, charging system and charging method. The Chinese patent "CN 201945262 U" discloses a submerged emulsion explosive charger, which mainly comprises a latex matrix storage tank, an additive storage tank, a latex matrix pump, an additive pump, a pressure measuring device, and a drag reduction. Devices and mixing devices. Wherein, the additive pump is connected to the drag reducing device, and the drag reducing device is connected to the mixing device through the drug delivery tube, and the latex matrix and the additive are mixed in the mixing device and sprayed into the blasthole by the drug pump. It should be particularly noted that the above additives have two effects, one of which is one of the components constituting the emulsion explosive, and the other is that the drag reduction device can be used to reduce the resistance, thereby facilitating the charging of the emulsion component. Moreover, the sensitization mode of the above emulsion explosive is a chemical sensitization mode, that is, the additive dispersed in the latex matrix chemically reacts in the blasthole to form microbubbles (ie, "hot spots" that promote the detonation reaction), which pass through a period of time" After the fermentation, an emulsion explosive is formed. Due to the continuous decrease in the density of the explosive during the formation of the emulsion explosive in the blasthole, the explosive form continues to expand and change, and the explosive may slowly fall out of the blasthole under the action of gravity. In addition, the degree of chemical sensitization is also affected by the ambient temperature and time, which will affect the stability of the explosive properties of the emulsion explosive. The viscosity of the emulsion explosive used for the upward charging of the blasthole is generally required to be high, and the viscosity of the latex matrix generally does not change significantly when the sensitizer is mixed with the latex matrix to form an emulsion explosive by chemical sensitization. In order to make the viscosity of the emulsion explosive sufficiently high, either the latex matrix itself is required to have a higher viscosity, or a device for increasing the viscosity is added at the time of charging. U.S. Patent Application "US 006070511 A" discloses a method for blasting a hole in a subterranean project. It adds a shearing device to the delivery hose that shears the shearing device. The viscosity will increase, and then reduced by the introduction of the liquid lubricant, and then mixed at the outlet end of the drug delivery hose through the mixing device, finally pumped into the blasthole under the action of the drug delivery pump, and passed through the blasthole. Chemical sensitization forms an emulsion explosive. The above method helps the explosive to adhere firmly in the blasthole by adjusting the viscosity, thereby reducing the occurrence of the re-feeding phenomenon, but the shearing device needs to additionally increase the pressure drop, which increases the load of the pump. It is not conducive to the safe work of the pump. The Canadian patent application "CA 494193" discloses a method suitable for underground engineering gunhole charging. The components constituting the latex are pumped through the drug delivery tube, and the water ring is used to reduce the resistance during the pumping process. At the end of the drug delivery tube, there is a ball valve or a spring valve structure shearing device. After the shearing device passes through the shearing device, the viscosity becomes larger, so that the explosive is pumped out and adhered in the upward blasthole, but it is guaranteed to be consumed in the shearing. The pressure drop on the cutting device is not less than 10. 5kgf, so the pumping pressure is still relatively large, which is still not conducive to the safe operation of the pump. In addition, when the emulsion explosive is mixed in the field, the viscosity, density, sensitivity and explosive properties of the explosive can be changed by mixing the latex matrix with the dry bulk material to satisfy the blasting effect. The latex matrix is a fluid material having a large density and viscosity, and the dry bulk material is often a powder or granule having a small density. Material. The existing mechanical emulsion explosive on-site mixer is divided into vertical and horizontal structures, wherein the vertical structure is not suitable for mixing two materials with different density differences (such as the above latex matrix and lightweight dry bulk material). The traditional horizontal mixer is used to mix the rubber matrix and the light dry bulk material. Since the latex matrix is a high-viscosity fluid, the blending effect of the blade motion in the mixing chamber of the mixer is small, and it is difficult to realize the latex matrix and the powdery dry. A thorough mix of bulk materials. In summary, the main technical problems to be solved in the on-site mixed charging system for underground engineering are: Under the premise of satisfying the blasting effect, the pressure of the pump is reduced as much as possible, thereby facilitating the pump The safe work, and the blasting effect is determined by the explosive performance and the charging effect of the emulsion explosive. At present, the sensitization of emulsion explosives is divided into chemical sensitization and physical sensitization. As can be seen from the above, the emulsion sensitizing method using chemical sensitization is not suitable for the upper blasthole of underground engineering. The emulsion sensitizing method using physical sensitization effectively overcomes the defects of chemically sensitized emulsion explosives. The defects of the closest prior art are as follows: 1. The blasting effect cannot be guaranteed very well. The main reasons are as follows: (1) The explosive performance of the emulsion explosive is not ideal, and the main factors causing such defects are: The sensitization method with emulsion explosives is chemically sensitized. Due to the defects of the chemical sensitization method, the emulsion explosive using this sensitization method is not suitable for the upper blasthole of underground engineering; b. The existing mixing machine is difficult The high-viscosity latex matrix is thoroughly and uniformly mixed with the low-density dry bulk material; (2) The charging effect is not satisfactory, and the emulsion explosive is easy to fall back to the blasthole, and the charging effect is not only the viscosity of the emulsion explosive, The sensitization method is related to factors such as the speed at which the explosive is ejected from the delivery hose. Second, in order to ensure the explosive performance of explosives, it is often necessary to add a shearing device for increasing the viscosity of the emulsion explosives on the drug delivery hose, but this will greatly increase the working pressure of the drug delivery pump, which is not convenient for the safe operation of the drug delivery pump. . SUMMARY OF THE INVENTION One of the technical problems to be solved by the present invention is to provide an emulsion explosive on-site mixed charging system suitable for underground engineering, and to reduce the working pressure of the drug delivery pump under the premise of ensuring the blasting effect. The technical scheme of the present invention is as follows: an emulsion explosive on-site mixed charging system suitable for underground engineering, comprising a mixing machine (1) and a medicine delivery hose (4), wherein the medicine dispensing port of the mixing machine (1) Connected to the drug feeding end of the drug delivery pump (2) through a pipe, the drug discharging end of the drug delivery pump is connected to the drug feeding end of the drug delivery hose (4) through a water ring adding device (3); The mixer (1) is a horizontal structure and includes a mixer casing (5), and the mixer casing (5) In the closed structure, the internal mixing chamber (5a) is surrounded by left and right side plates, front and rear side plates and a top bottom plate, and a feed port is opened at the left side of the top plate, and the medicine is opened at the right side of the bottom plate. a mouth (5b), and the feed port and the drug outlet (5b) are in communication with the mixing chamber (5a); the mixing chamber (5a) of the mixer shell (5) is provided with a mixing mixture a shaft (6), the left and right portions of the mixing shaft (6) are respectively supported by bearings on the corresponding left and right side plates, and the mixing shaft (6) is rotated by the motor (7); (6) There are 2~5 radial blade groups uniformly distributed in the circumferential direction, each radial blade group is composed of 2~6 radial blades (8), and the radial blades (8) in the same group are mixed The axial arrangement of the shaft (6) is characterized in that: a premixing chamber (9) is arranged above the feed opening of the mixer housing (5), and the inner chamber of the premixing chamber passes through the discharge opening at the bottom thereof Connected to the feed port of the mixer casing (5); a flat dry bulk discharge pipe (10) is vertically disposed above the premixing chamber (9), and the dry material is discharged. The discharge end of the tube passes through the premixing chamber (9) The opening at the top communicates with the inner cavity of the premixing chamber; the side of the premixing chamber (9) is horizontally provided with a flat latex matrix discharge pipe (11), and the latex matrix discharge pipe is discharged The material end communicates with the inner cavity of the premixing chamber through an opening on the side of the premixing chamber (9); the mixing shaft (6) is surrounded by an axial blade group, and the position and number of the axial blade group are The radial vane sets are in one-to-one correspondence, and each axial vane set is composed of 1 to 3 axial vanes (12), and the axial vanes (12) and all radial vanes of the corresponding radial vane set (8) a fixed connection; the dispensing end of the drug delivery hose (4) is provided with a spraying device, the spraying device comprises a spray head (13) and a second sleeve (15), wherein the spray head (13) is a cylindrical structure a main spray hole (13a) is opened along the axial line of the spray head (13), the main spray hole has an aperture of 8 mm to 15 mm; and the first sleeve (14) is jacketed on the spray head (13) The upper portion of the first sleeve (14) is exposed to the upper nozzle of the second sleeve (15), and the remaining portion of the first sleeve (14) extends to the upper tube of the second sleeve (15) In the mouth, and the extending portion is screwed to the second sleeve (15), and the nozzle (13) is limited by the step of the upper end of the inner wall of the first sleeve (14) and the step of the inner wall of the second sleeve (15) The lower portion of the second sleeve (15) is inserted into the inner hole of the drug delivery end of the drug delivery hose (4), and the insertion portion is tightly fitted with the hole wall of the inner hole of the drug delivery hose (4). In order to ensure the blasting effect, the invention is mainly realized by three technical innovations. The specific technical innovations are as follows: First, on the basis of the traditional structure, a premixing chamber (9) is added on the top of the mixer casing. The latex matrix in the inner cavity of the premixing chamber (9) forms a strip-shaped jet, and the light material (ie dry bulk material) is evenly laid on the latex matrix strip under the action of gravity, and further mixed. The preliminary mixing is formed before, which is beneficial to improve the mixing characteristics of the mixer. In addition, in order to improve the overall stirring effect of the blade, an axial blade group is added between the radial blade groups which play a major role in material blending, so that the material is in the entire mixing chamber (5a) of the mixer casing (5). Inverting, increasing the influence range of the radial blade (8) blending material, thereby greatly improving the overall mixing degree of the emulsion explosive components, and finally uniformly mixing the high-viscosity emulsion explosive. Second, the sensitization method of the current emulsion explosive is physical sensitization, that is, the components constituting the emulsion explosive are mixed into an emulsion explosive in the mixing chamber (5a) of the mixer casing (5), and then the medicine pump is mixed. (2) The pumping hose (4) is pumped into the blasthole, which effectively overcomes the defects of the traditional chemical sensitization method and eliminates the problem of returning the emulsion explosive due to expansion in the blasthole. Thirdly, a spraying device is added at the upper end of the medicine delivery hose (4), because the main spray hole (13a) of the spray head (13) has a smaller aperture and is smaller than the diameter of the medicine delivery hose (4). In this way, the speed at which the emulsion explosive is sprayed to the blasthole is greatly improved, so that the emulsion explosive can be prevented from falling out of the blast hole by gravity before reaching the charging surface of the blasthole (P), and the emulsion explosive can be made. It adheres well to the blasthole, which greatly improves the charge effect. At the same time, the technical innovation adopted by the present invention to reduce the working pressure of the drug delivery pump (2) and ensure the safe operation of the drug delivery pump (2) is as follows: The prior art is provided on the drug delivery hose (4) for improvement The shearing device for emulsifying the viscosity of the explosive, which greatly reduces the working pressure of the drug delivery pump (2), thereby ensuring the safe operation of the drug delivery pump (2). The viscosity of the emulsion explosive is improved and achieved by using a physical sensitization method and adding different proportions of dry bulk material. In the present invention, the feed end of the dry bulk discharge pipe (10) communicates with the discharge end of the dry bulk storage tank (17) through the first feed pipe (16), and in the first feed pipe ( 16) a first metering device (18) is connected in series, and the first metering device (18) is a feed screw or a diaphragm pump; the feed end of the latex matrix discharge pipe (11) passes through the second feed pipe (19) ) is in communication with the discharge end of the rubber substrate storage tank (20), and has a second metering device (21) connected in series with the second feed tube (19), and the second metering device (21) is a cam rotor pump. With the above structure, the present invention transports dry bulk material to the dry bulk discharge pipe (10) through the dry bulk storage tank (17), and can be transported to the latex matrix discharge pipe (11) through the rubber matrix storage tank (20). Latex matrix. Preferably, each of said radial blade sets is composed of four radial blades (8), and each axial blade group is composed of two axial blades (12); the left end of said mixing shaft (6) Extending into the mixing chamber (5a) of the mixer housing (5), the extended end is connected to the output shaft of the motor (7). Of course, the specific number of radial blades in the radial blade group and the specific number of axial blades in the axial blade group can be adjusted accordingly according to actual needs, and is not limited to the number in the embodiment. a power regulating agent inlet port (5c) is opened in a middle portion of the top plate of the mixer casing (5), and the power regulating agent inlet port communicates with the mixing chamber (5a) of the mixer casing (5); The power regulator feed port (5c) communicates with the discharge end of the porous ammonium nitrate storage tank (23) through the third feed pipe (22), and a third metering device is connected in series on the third feed pipe (22). (24), and the third metering device (24) is a conveying screw; the third metering device (24) is connected to the discharge end of the fourth feeding tube (25), and the fourth feeding tube (25) is advanced The material end is connected to the discharge end of the diesel storage tank (26), and a fourth metering device (27) is connected in series on the fourth feed pipe (25), and the fourth metering device (27) is a gear pump. In the art, porous granular ammonium nitrate is mixed with diesel to form a porous granular ammonium explosive, which is mixed as a power regulator into an emulsion explosive to form a heavy ammonium explosive, also known as an emulsified ammonium explosive. Among them, the power regulator can play the role of increasing the density of the explosive and the relative weight of the explosive, which can improve the blasting effect. The center line of the main spray hole (13a) is on the same line as the center line of the first and second sleeves (14, 15), and is axially opened on the nozzle (13) by 3 to 5 The auxiliary injection hole (13b) is evenly distributed around the main spray hole (13a) in the circumferential direction, and the auxiliary injection hole (13b) has a diameter L of 3 mm to 10 mm. According to the above structure, the present invention can divide the emulsion explosive in the drug delivery hose into a plurality of explosives and spray it into the blasthole, thereby further increasing the speed at which the emulsion explosive is directed at the blasthole. Although the structure is simple, the present invention can be further improved. The charging effect of the invention. In the actual manufacturing process, the aperture of the auxiliary injection hole (13b) can be flexibly selected between 3 mm and 10 mm according to the actual situation, and of course, it can be selected in addition to 3 mm to 10 mm. The distance from the upper end of the auxiliary injection hole (13b) to the core line of the main spray hole (13a) is greater than the distance from the lower end of the auxiliary injection hole (13b) to the core line of the main spray hole (13a), and the auxiliary injection hole ( The angle between the hole core line of 13b) and the core line of the main spray hole (13a) is 2° to 10°. With the above structure, the present invention can have a certain scattering angle between the explosive flow ejected from the auxiliary injection hole (13b) and the explosive flow ejected from the main injection hole (13a), thereby ensuring a certain scattering area and optimizing The shape of the spray surface is sprayed, and the sprayed emulsion explosive is uniformly attached to the blasthole, thereby further improving the blasting effect of the explosive. The inner wall of the second sleeve (15) has 1~5 sump (15a) in the circumferential direction, the sump (15a) is close to the nozzle (13), and the depth of the sump (15a) is 1 mm~ 3mm, width is 5 mm~5mm; the bottom of each of the sump (15a) has 5~20 drain holes (15b) in the circumferential direction, and the drain 孑L (15b) has a hole diameter of lmm~5mm. In order to reduce the conveying resistance of the emulsion explosive in the drug delivery hose, the present invention adds a ring-shaped lubricating water agent through the water ring adding device (3), and the ring-shaped lubricating water agent is wrapped in the inner wall of the drug delivery hose and The emulsion explosives in the drug delivery hose are interspersed with the emulsion explosive in the drug delivery hose and moved toward the drug delivery end of the drug delivery hose. In order to ensure the explosive performance of the emulsion explosive, it is necessary to filter out the lubricating water agent when the emulsion explosive is sprayed to the blasthole. With the above structure, the present invention can filter the lubricating water between the drug delivery hose and the emulsion explosive through the sump (15a), and the filtered lubricating agent seeps into the second casing through the drain hole (15b). (15), so as to reliably guarantee the explosion performance. Preferably, the sump (15a) has a depth of 1 mm to 3 mm and a width of 5 mm to 15 mm. The above design parameters are moderate, and drainage can be well achieved. Of course, values or ranges of values outside the above parameter ranges may also be selected as needed, and are not limited to the design parameters described in this embodiment. In the present embodiment, the number of the drain holes (15b) is moderate, which prevents the drainage effect from being affected by the too small number of drain holes (15b), and avoids setting too many drain holes (15b) without benefit. In addition, the diameter of the drain hole (15b) can be flexibly selected from 1mm to 5mm according to the actual situation, and of course, it can be selected in addition to lmm~5mm. The second technical problem to be solved by the present invention is to provide a charging method based on an on-site mixed charging system suitable for underground engineering, and to reduce the working pressure of the medicine pump under the premise of ensuring the blasting effect. A charging method based on an on-site mixed charging system for an underground engineering, characterized in that: an emulsion explosive mixed in a mixing chamber (5a) of the mixing machine casing (5) is in the diameter Pushed toward the blade (8), the drug outlet (5b) of the mixer casing (5) is pushed out, and the pushed emulsion explosive is introduced through the water ring under the pumping pressure of the drug pump (2). The device (3), and the lubricating water agent is introduced between the inner tube wall of the drug delivery hose (4) and the emulsion explosive through the water ring adding device (3); the emulsion explosive is in the drug delivery pump

( 2 ) The pumping pressure and the lubricating agent are wrapped around the inner tube wall of the drug delivery hose (4), and finally moved to the drug delivery end of the drug delivery hose (4), outside the emulsion explosive Lubricating agent is said second casing

The drain tank (15a) and the drain hole (15b) of (15) are filtered out, and the emulsion explosive is finally ejected from the main spray hole (13a) and the auxiliary spray hole (13b) of the spray head (13), and is sprayed toward the blast hole. (P); the diameter of the drug delivery hose (4) is 25 mm to 40 mm, and the flow rate of the emulsion explosive in the drug delivery hose (4) is 0.7 m/s to 3.5 m/s, and the emulsion explosive is sprayed. The speed of the main spray hole (13a) of the nozzle (13) is 2.5 m/s to 15 m/s. In the charging method, the blasting performance is mainly ensured from the aspect of ensuring the charging effect. Theoretically, the faster the flow rate of the emulsion explosive in the drug delivery hose (4), the faster the emulsion explosive is ejected from the main spray hole (13a) of the spray head (13), and the easier the emulsion explosive is. Firmly attached to the blasthole, it is not easy to return powder, which can improve the charging effect, so as to ensure the blasting effect from the charge. However, the faster the flow rate of the emulsion explosive in the drug delivery hose (4), the emulsion explosive is ejected out of the nozzle (13) The faster the speed of the main spray hole (13a), the greater the working pressure of the drug delivery pump (2), and the more unfavorable the safe operation of the drug delivery pump (2). Therefore, in order to reduce the working pressure of the drug delivery pump under the premise of ensuring the blasting effect, the flow rate of the emulsion explosive in the drug delivery hose (4) is required, and the emulsion explosive is sprayed out of the nozzle (13). The speed at the spray hole (13a) and the pipe diameter of the delivery hose (4) are compromised. In the charging method, the diameter of the drug delivery hose (4) is 25 mm to 40 mm, and the flow rate of the emulsion explosive in the drug delivery hose (4) is 0.7 m/s to 3.5 m/s, and The emulsion explosive is ejected from the main spray hole (13a) of the head (13) at a speed of 2.5 m/s to 15 m/s. The above three parameters are relatively moderate in size, and the working pressure of the drug delivery pump (2) can be reduced under the premise of ensuring the blasting performance, thereby facilitating the safe operation of the drug delivery pump (2). Advantageous Effects: In order to ensure the blasting effect, the present invention is mainly realized by technical innovations in three aspects. The specific technical innovations are as follows: First, on the basis of the conventional structure, a premixing chamber is added at the top of the mixer casing. (9), the latex matrix in the inner cavity of the premixing chamber (9) forms a strip-shaped jet in the strip, and the lightweight material (ie dry bulk material) is evenly laid on the latex matrix strip under the action of gravity, The preliminary mixing is formed before further mixing, which is beneficial to improve the mixing characteristics of the mixer. In addition, in order to improve the overall stirring effect of the blade, an axial blade group is added between the radial blade groups which play a major role in material blending, so that the material is in the entire mixing chamber (5a) of the mixer casing (5). Inverting, increasing the influence range of the radial blade (8) blending material, thereby greatly improving the overall mixing degree of the emulsion explosive components, and finally uniformly mixing the high-viscosity emulsion explosive. Second, the sensitization method of the current emulsion explosive is physical sensitization, that is, the components constituting the emulsion explosive are mixed into an emulsion explosive in the mixing chamber (5a) of the mixer casing (5), and then the medicine pump is mixed. (2) The pumping hose (4) is pumped into the bore, which effectively overcomes the drawbacks of traditional chemical sensitization. Thirdly, a spraying device is added at the upper end of the medicine delivery hose (4), since the main spray hole (13a) of the spray head (13) has a smaller aperture and is smaller than the diameter of the delivery hose (4). In this way, the speed at which the emulsion explosive is sprayed to the blasthole is greatly improved, so that the emulsion explosive can be prevented from falling out of the blast hole by gravity before reaching the charging surface of the blasthole (P), and the emulsion explosive can be made. It adheres well to the blasthole, which greatly improves the charge effect. At the same time, the technical innovation adopted by the present invention to reduce the working pressure of the drug delivery pump (2) and ensure the safe operation of the drug delivery pump (2) is as follows: The prior art is provided on the drug delivery hose (4) for improvement. Emulsified explosive viscosity This will greatly reduce the working pressure of the drug delivery pump (2), thus ensuring the safe operation of the drug delivery pump (2). The viscosity of the emulsion explosive is improved and achieved by using a physical sensitization method and adding different proportions of dry bulk material. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of the structure of the present invention; FIG. 2 is a schematic view of the mixing machine 1 of FIG. 1; FIG. 3 is a partial enlarged view of a portion A of FIG. FIG. 5 is an outline view of the head 13 of FIG. 4; and FIG. 6 is an outline view of the first sleeve 14 and the second sleeve 15 of FIG. In the above figures, the component names of the respective labels are as follows:

I-mixer, 2-drug pump, 3-water ring adding device, 4-drug hose, 5 mixer shell, 6-mixing shaft, 7-motor, 8-radial blade, 9 Premixing chamber, 10-dry material discharge pipe,

I I-latex matrix discharge tube, 12-axial blade, 13 nozzle, 14-first sleeve, 15-second

16 first feeding tube, 17-dry bulk storage tank, 18—first metering device, 19 second feeding tube,

20—gel matrix storage tank,

21 second metering device, 22 third feeding tube, 23 porous ammonium nitrate storage tank, 24—third metering device, 25 fourth feeding tube,

26 diesel storage tank, 27—four metering device, 28—connector, 29—connector, 30—connecting pipe, 31 water ring storage tank, 32—gear pump, and 33—check valve. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be further described below with reference to the accompanying drawings and embodiments. As shown in Figures 1 to 6, the present invention mainly consists of a mixing machine 1, a drug delivery pump 2, a water ring adding device 3, and a drug delivery. The hose 4, the premixing chamber 9, the dry bulk discharge tube 10, the latex matrix discharge tube 11, and a spraying device are formed. The kneading machine 1 is of a horizontal structure, and includes a kneading machine casing 5, and the kneading machine casing 5 is a closed structure, and the inner mixing chamber 5a is surrounded by left and right side plates, front and rear side plates and a top plate. And a feeding port (not shown) is opened in the left part of the top plate, and a medicine outlet 5b is opened in the right part of the bottom plate, and the feeding port and the medicine discharging port 5b are communicated with the medicine mixing chamber 5a. a mixing shaft 6 is disposed in the mixing chamber 5a of the mixer casing 5, and the left and right portions of the mixing shaft 6 are respectively supported by the bearing (not labeled) on the corresponding left and right side plates, and the mixing shaft is mixed 6 is rotated by the motor 7. In this embodiment, the left end of the mixing shaft 6 extends outside the mixing chamber 5a of the mixer casing 5, the protruding end is connected to the output shaft of the motor 7, and the motor 7 is mounted through the connecting member 28. On the connecting seat 29, the connecting seat 29 is fixedly connected to the outer surface of the left side plate of the mixer casing 5. Of course, we can also replace the motors with hydraulic motors as needed, and they all function the same, which is the power of the mixing shaft 6. As shown in FIG. 2, on the mixing shaft 6, there are 2 to 5 radial blade groups uniformly distributed in the circumferential direction, and each radial blade group is composed of 2 to 6 radial blades 8, and the diameters in the same group The blade 8 is disposed in the axial direction of the mixing shaft 6. In this embodiment, each of the radial blade sets is preferably composed of four radial blades 8 , and the specific arrangement of the radial blades 8 is exactly the same as that of the prior art, and details are not described herein. As one of the technical means for improvement of the present invention, the mixing shaft 6 is surrounded by an axial blade group, and the position and number of the axial blade groups are in one-to-one correspondence with the radial blade group. Each of said axial blade sets consists of 1 to 3 axial blades 12 which are fixedly connected to all radial blades 8 of the corresponding radial blade set. In the present embodiment, each of the axial blade sets is composed of two axial blades 12. As shown in FIG. 1 and 2, a premixing chamber 9 is provided above the feeding port of the mixer casing 5, and the premixing chamber 9 has a square structure and has an inner cavity through which the inner cavity passes. The discharge port at the bottom of the 9 is in communication with the feed port of the mixer housing 5. A flat dry bulk discharge pipe 10 is vertically disposed above the premixing chamber 9, and the discharge end of the dry bulk discharge pipe 10 passes through the opening at the top of the premixing chamber 9 and the premixing chamber 9 The lumen is connected. The feeding end of the dry bulk discharge pipe 10 communicates with the discharge end of the dry bulk storage tank 17 through the first feed pipe 16, and the first metering device 18 is connected in series on the first feed pipe 16, and the first A metering device 18 is preferably a feed screw or diaphragm pump. The side of the premixing chamber 9 is horizontally provided with a flat latex matrix discharge pipe 11, and the discharge end of the latex matrix discharge pipe 11 passes through the opening of the side of the premixing chamber 9 and the inner cavity of the premixing chamber 9. Connected. The feed end of the latex matrix discharge pipe 11 communicates with the discharge end of the rubber substrate storage tank 20 through the second feed pipe 19, and the second metering device 21 is connected in series with the second feed pipe 19, and the second metering Device 21 is preferably a cam rotor pump. As shown in FIG. 1, 2, and 3, preferably, a power regulating agent inlet port 5c is opened in a middle portion of the top plate of the mixer casing 5, and the power regulating agent inlet port 5c is mixed with the mixer casing 5 The drug chamber 5a is in communication. The power regulator inlet 5c communicates with the discharge end of the porous ammonium nitrate storage tank 23 through the third feed pipe 22, and a third metering device 24 is connected in series to the third feed pipe 22, and the third metering device 24 It is preferably a conventionally used conveying screw. The third metering device 24 is connected to the discharge end of the fourth feed pipe 25, and the feed end of the fourth feed pipe 25 is connected to the discharge end of the diesel storage tank 26. A fourth metering device 27 is connected in series to the fourth feed pipe 25, and the fourth metering device 27 is a gear pump. As shown in Fig. 1 and 2, the dispensing port of the mixer 1 (i.e., the dispensing port 5b on the outer casing 5 of the kneading machine) is connected to the feeding end of the drug delivery pump 2 through a pipe (not shown). The dispensing end of the drug delivery pump 2 is in communication with the drug delivery hose 4 through a water ring adding device 3, thereby delivering the emulsion explosive mixed in the mixing machine 1 into the drug delivery hose 4. In the present embodiment, the structure of the water ring adding device 3 is a conventional structure, and the structure disclosed in the Chinese patent ZL201020253795. Further, the water ring adding device 3 is connected to the water ring storage tank 31 via a connecting pipe 30, and a gear pump 32 and a check valve 33 are connected in series to the connecting pipe 30, and the check valve 33 is located at the gear pump 32 and the water The ring is added between the devices 3, thereby providing the lubricating water agent for lubricating the water ring adding device 3 by the water ring storage tank 31, so as to reduce the resistance of the emulsion explosive when transported over the long distance in the drug delivery hose 4, and Effectively reduce the working pressure of the drug delivery pump 2. As shown in Figures 1, 4, 5 and 6, a dispensing device is provided at the dispensing end of the upper portion of the drug delivery hose 4, the spraying device being provided by the spray head 13, the first sleeve 14, and the second sleeve 15. Composition. The nozzle 13 has a cylindrical structure, and a main spray hole 13a is formed on the nozzle 13 along its axis, and the main spray hole 13a has a hole diameter of 8 mm to 15 mm. Further, 3 to 5 auxiliary injection holes 13b are formed in the nozzle 13 in the axial direction, and the auxiliary injection holes 13b are uniformly distributed around the main spray holes 13a in the circumferential direction, and the aperture of the auxiliary injection holes 13b is provided. 3mm~10mm. In addition, the distance from the upper end of the auxiliary injection hole 13b to the core line of the main spray hole 13a is greater than the distance from the lower end of the auxiliary injection hole 13b to the core line of the main spray hole 13a, and the hole line of the auxiliary injection hole 13b is The angle formed between the core lines of the main spray holes 13a is 2° to 10°. The first nozzle 14 is jacketed on the nozzle 13 , the upper portion of the first sleeve 14 is exposed to the upper nozzle of the second sleeve 15 , and the remaining portion of the first sleeve 14 extends to the second sleeve 15 . The upper portion of the upper nozzle is threadedly coupled to the second sleeve 15. The main spray hole 13a of the spray head 13 has a core line on the same line as the center line of the first and second sleeves 14, 15, and the spray head 13 is formed by the upper end of the inner wall of the first sleeve 14 and the second sleeve. The step on the inner wall of the 15 is axially limited. The lower portion of the second sleeve 15 is inserted into the inner hole of the drug delivery end of the drug delivery hose 4, and the insertion portion is tightly fitted with the hole wall of the inner hole of the drug delivery hose 4, thereby firmly mounting the spray device in the drug delivery. The upper end of the hose 4. It can be further seen from Figures 1, 4, 5 and 6 that the inner wall of the second sleeve 15 has 1 to 5 sump 15a in the circumferential direction, the sump 15a is close to the nozzle 13, and the sump 15a The depth is from 1mm to 3mm and the width is from 5mm to 15mm. The bottom of each of the sump 15a has 5 to 20 drain holes 15b in the circumferential direction, and the drain hole 15b has a hole diameter of 1 mm to 5 mm. An charging method based on an on-site mixed charging system for an underground engineering, characterized in that: the emulsion explosive mixed in the mixing chamber 5a of the mixing machine casing 5 is pushed by the radial blade 8 Next, the dispensing port 5b of the mixer casing 5 is pushed out, and the pushed emulsion explosive is first introduced into the device 3 through the water ring under the pumping pressure of the drug delivery pump 2, and is added through the water ring adding device 3 A lubricating water agent is introduced between the inner tube wall of the drug delivery hose 4 and the emulsion explosive; the emulsion explosive moves along the inner tube wall of the drug delivery hose 4 under the pumping pressure of the drug delivery pump 2 and the lubricating agent And finally moving to the dispensing end of the upper portion of the drug delivery hose 4, the lubricating water agent outside the emulsion explosive is filtered by the drain tank 15a and the drain hole 15b of the second sleeve 15, and the emulsion explosive is finally discharged from the head of the head 13 The spray hole 13a and the auxiliary injection hole 13b are ejected and sprayed toward the blast hole. . The pipe diameter of the drug delivery hose 4 is 25 mm to 40 mm, the flow rate of the emulsion explosive in the drug delivery hose 4 is 0.7 m/s to 3.5 m/s, and the emulsion spray ejects the main spray of the nozzle 13 The speed of the drug hole 13a is 2. 5 m / s to 15 m / s, and the drug delivery amount of the drug delivery hose 4 is 60 kg / min ~ 100 kg / min. Further, the lubricating water agent is composed of water and a surfactant, and the surfactant is one or more of sodium dodecyl sulfate, sodium dodecylbenzenesulfonate, and sodium succinatesulfonate. The composition of the components. The above lubricating water agent not only helps to prevent the instability of the explosive performance caused by chemical sensitization, but also helps to reduce the interfacial tension between the explosive and the lubricant, and reduces the pressure of the drug delivery. It should be noted that the latex matrix has a kinematic viscosity of 15000 cP to 35000 cP, a water content of 15% to 20%, and a weight ratio of other explosives of 60% to 98%. The light dry bulk material is used as a sensitized dry material, and its material is glass microbead or resin microbead, and its bulk density is 0.05g/cm ^{3 to} 0.60g/cm ³ , and other explosives are 2% by weight. ~10%. The explosive power regulator is composed of porous granular ammonium nitrate and diesel oil, wherein the weight ratio of the porous granular ammonium nitrate to the diesel oil is (93.0%~96.0%): (4%~7%), and the optimal mass ratio is 94.5. %: 5.5%. In addition, the explosive power regulator accounts for 0% to 30% by weight of the explosive.

In the charging method, the blasting performance is mainly ensured from the aspect of ensuring the charging effect. Theoretically, the faster the flow rate of the emulsion explosive in the drug delivery hose 4, the faster the emulsion explosive is ejected from the main spray hole 13a of the spray head 13, and the easier the emulsion explosive adheres to the blasthole. Inside, it is not easy to return powder, which can improve the effect of the charge, so as to ensure the blasting effect from the charge. However, the faster the flow rate of the emulsion explosive in the drug delivery hose 4, the emulsion explosive ejects the main spray hole 13a of the spray head 13 The faster the speed, the greater the working pressure of the drug delivery pump 2, and the more unfavorable the safe operation of the drug delivery pump 2. Therefore, it is necessary to make a compromise between the flow rate of the emulsion explosive in the drug delivery hose 4, the speed at which the emulsion explosive is ejected from the main spray hole 13a of the spray head 13, and the diameter of the drug delivery hose 4 and the like. In order to reduce the working pressure of the drug delivery pump under the premise of ensuring the blasting effect. The following examples of using the above charging method are provided: Example 1: The diameter of the blasthole of an underground mine is 42 mm, the blasthole is a horizontal hole, the depth of the blasthole is 2 m, and the dynamic viscosity of the raw material latex matrix used is 25000 cP. The latex matrix has a water content of 18%, the latex matrix accounts for 98% of the explosives, the lightweight bulk material is made of glass microbeads, and the light bulk material accounts for 2% of the explosives. The lg 12-mercapto sodium sulfonate is dissolved in water to make 1 kg of lubricant. The weight ratio of lubricant to explosive is 0.02: 1, the inner diameter of the delivery hose is 0.75", and the length of the delivery hose is 15m. The relative weight of the explosive (relative to ANFO) 0.81, the relative volumetric power of the explosive (relative to ANFOM.04, the viscosity of the explosive is 300,000 cP~500,000 cP (varies with temperature, etc.), the pressure of the pump is about 0.4 MPa, the packing density It is 1.1 g/cm ³ , the charging efficiency is 20 kg/min, and the blasting is successful. Example 2: The diameter of the blasthole of an underground mine is 42mm, the blasthole is horizontal, the depth of the blasthole is 2m, and the power of the raw material latex matrix is used. Viscosity is 25000 cP, latex matrix The water content is 18%, the latex matrix accounts for 98% of the explosives, the light bulk material uses the glass microbead material, the light bulk material accounts for 2% of the explosives, and the water is directly used as the lubricant, the lubricant and the explosive weight. The ratio is 0.02: 1, the inner diameter of the delivery hose is 0.75", and the length of the delivery hose is 15m. The relative weight of the explosive is formulated (relative to ANFO) 0.81, the relative volumetric power of the explosive (relative to ANFO) 1.04, the viscosity of the explosive It is 300,000 cP~500,000 cP (varies with temperature and other conditions), the pressure of the drug delivery pump is about 1.3 MPa, the packing density is 1.1 g/cm ³ , the charging efficiency is 20 kg/min, and the blasting is successful. Example 3: The vertical depth of the underground mine is 76mm, the maximum depth of the blasthole is 22m, the dynamic viscosity of the raw latex matrix is 25000cP, the moisture content of the latex matrix is 18%, and the proportion of the latex matrix is 98%. The light bulk material is made of resin microbead material, and the proportion of light bulk material accounts for 2% of the explosive. The lg-dodecyl sulfate and sodium lg-dodecyl sulfonate are dissolved in water to prepare 1kg lubricant. , the weight ratio of lubricant to explosive is 0.02: 1, The inner diameter of the drug hose is 1. 5", the length of the drug delivery hose is 50m. The relative weight of the explosive is 0.81 (relative to ANFO), the relative volumetric power of the explosive (relative to ANFO) is 1.04, and the viscosity of the explosive is 600000 cP~800000cP. (It varies with temperature and other conditions), the packing density is 1.1 g/cm ³ , the charging efficiency is 40 kg/min, the pressure of the pump is less than 1.5 MPa, and the phenomenon of blasthole refilling does not occur during the charging process. blasting. Example 4: The diameter of the blasthole in a vertical mine is 76mm, the maximum depth of the blasthole is 31m, the dynamic viscosity of the raw material latex matrix is 28000cP, and the water content of the latex matrix is 16%. The ratio of latex matrix to explosives is 83%, the light bulk material is made of glass microbead material, and the proportion of light bulk material to explosives is 2%. The granular bulk material is made of porous granular ammonium explosive, and the granular bulk material accounts for explosives. The ratio is 15%, 3g of sodium decyl sulfate is dissolved in water to make 1kg of lubricant, the weight ratio of lubricant to explosive is 0.03: 1, the inner diameter of the delivery hose is 1. 5", the length of the delivery hose It is 50m. The relative weight of the explosive is 0.85 relative to ANFO, the relative volumetric power of the explosive (relative to ANFO) is 1.20, and the viscosity of the explosive is 800000cP~11000000cP (varies with temperature and other conditions), the packing density is 1.25 g. /cm ³ , the charging efficiency is 40kg/min, the pressure of the drug delivery pump is less than 1.8MPa, the phenomenon of blasthole refilling does not occur during the charging process, and the blasting is successful. Example 5: The diameter of the blasthole of an underground mine is vertical. 100mm, the maximum depth of the blasthole is 25m, the raw latex matrix has a dynamic viscosity of 28000cP, the latex matrix has a water content of 16%, the latex matrix accounts for 97% of the explosive, and the lightweight bulk uses resin beads. Material, sensitized dry material The ratio of 3% is 12% sodium sulphate and sodium lg-dodecyl sulfonate dissolved in water to make a 1kg lubricant, the weight ratio of lubricant to explosive is 0.04: 1, the drug delivery hose The inner diameter of 1. 5", the length of the delivery hose is 50m. The relative weight of the prepared explosive (relative to ANFO) is 0.81, the relative volumetric power of the explosive (relative to ANFO) is 1.05, and the viscosity of the explosive is 1000000 cP~1200000 cP (varies with temperature and other conditions), and the packing density is 1.07 g/cm. ³ , the charging efficiency is 60 kg / min, the pressure of the drug delivery pump is less than 2.0 MPa, the phenomenon of blasthole refilling does not occur during the charging process, and the blasting is successful. The above is only the preferred embodiment of the present invention, and is not intended to limit the invention. Any modifications, equivalent substitutions and improvements made within the spirit and scope of the present invention should be included in the present invention. Within the scope of protection.

Claims

claims

1. An on-site mixing and charging system for emulsion explosives suitable for underground engineering, including a mixer (1) and a drug delivery hose (4), in which the drug outlet of the mixer (1) is connected to the drug delivery hose through a pipeline The medicine inlet end of the pump (2) is connected, and the medicine outlet end of the medicine delivery pump is connected to the medicine inlet end of the medicine delivery hose (4) through the water ring adding device (3); the mixer (1) It is a horizontal structure and includes a mixer shell (5), and the mixer shell (5) is a closed structure, and its internal mixing chamber (5a) is surrounded by left and right side plates, front and rear side plates, and top and bottom plates. And there is a feed port on the left part of the top plate, and the medicine outlet (5b) is opened on the right part of the bottom plate, and the feed port and the medicine outlet (5b) are both connected with the medicine mixing chamber (5a) The mixing chamber (5a) of the mixer casing (5) is provided with a mixing shaft (6), and the left and right parts of the mixing shaft (6) are supported on the corresponding left and right side plates through bearings. And the mixing shaft (6) rotates under the driving of the motor (7); there are 2 to 5 radial blade groups evenly distributed in the circumferential direction on the mixing shaft (6), and each radial blade group consists of 2 to 6 It is composed of radial blades (8), and the radial blades (8) in the same group are arranged along the axial direction of the mixing shaft (6), and is characterized by: above the feed inlet of the mixer shell (5) A premixing chamber (9) is provided, and the inner cavity of the premixing chamber is connected to the feed port of the mixer shell (5) through the discharge port at the bottom; above the premixing chamber (9) A flat dry bulk material discharge pipe (10) is vertically provided, and the discharge end of the dry bulk material discharge pipe is connected to the inner cavity of the premixing chamber (9) through the opening at the top of the premixing chamber; A flat latex matrix discharge pipe (11) is horizontally provided on the side of the premixing chamber (9). The discharge end of the latex matrix discharge pipe passes through the opening on the side of the premixing chamber (9) and connects to the premixing chamber. lumen communication;

There are axial blade groups evenly distributed around the mixing shaft (6). The position and number of the axial blade group correspond to the radial blade group, and each axial blade group consists of 1 to 3 pieces. Composed of axial blades (12), the axial blades (12) are fixedly connected to all radial blades (8) of the corresponding radial blade group;

The medicine delivery end of the medicine delivery hose (4) is equipped with a spraying device. The spraying device includes a nozzle (13) and a second casing (15). The nozzle (13) has a cylindrical structure. The nozzle (13) has a cylindrical structure. 13) has a main spray hole (13a) along its axis, and the diameter of the main spray hole is 8mm~15mm; there is a first casing (14) outside the nozzle (13), and the first casing (14) is The upper part of the casing (14) is exposed outside the upper nozzle of the second casing (15), and the remaining part of the first casing (14) extends into the upper nozzle of the second casing (15), and this extension The inlet part is threadedly connected to the second casing (15), and the nozzle (13) is axially limited by the steps at the upper end of the inner wall of the first casing (14) and the steps on the inner wall of the second casing (15); The lower part of the second sleeve (15) is inserted into the inner hole of the medicine delivery end of the medicine delivery hose (4), and the insertion section tightly matches the hole wall of the inner hole of the medicine delivery hose (4).

2. The on-site mixing and charging system for emulsified explosives suitable for underground engineering according to claim 1, characterized in that: the feed end of the dry bulk material discharge pipe (10) passes through the first feeding pipe (16) and The discharge end of the dry bulk material storage tank (17) is connected, and a first metering device (18) is connected in series to the first feeding pipe (16), and the first metering device (18) is a feeding screw or a diaphragm pump;

The feed end of the latex matrix discharge pipe (11) is connected to the discharge end of the latex matrix storage tank (20) through the second feed pipe (19), and there is a second feed pipe (19) connected in series. Metering device (21), and the second metering device (21) is a cam rotor pump.

3. The on-site mixing and charging system for emulsion explosives suitable for underground engineering according to claim 1 or 2, characterized in that: each of the radial blade groups is composed of 4 radial blades (8), and each The axial blade set is composed of two axial blades (12); the left end of the mixing shaft (6) extends to the outside of the mixing chamber (5a) of the mixer casing (5), and the extended end is connected to the mixing chamber (5a) of the mixer casing (5). The output shaft of the motor (7) is connected.

4. The on-site mixing and charging system for emulsified explosives suitable for underground engineering according to claim 4, characterized in that: a power modifier feed port (5c) is opened in the middle of the top plate of the mixer shell (5) , the power regulator feed port is connected with the mixing chamber (5a) of the mixer shell (5);

The power regulator feed port (5c) is connected to the discharge end of the porous ammonium nitrate storage tank (23) through the third feeding pipe (22), and a third metering device is connected in series on the third feeding pipe (22) (24), and the third metering device (24) is a feeding screw;

The third metering device (24) is connected to the discharge end of the fourth feeding pipe (25), and the feeding end of the fourth feeding pipe (25) is connected to the discharge end of the diesel storage tank (26), and A fourth metering device (27) is connected in series on the fourth feeding pipe (25), and the fourth metering device (27) is a gear pump.

5. The on-site mixing and charging system for emulsion explosives suitable for underground engineering according to claim 1, characterized in that: the hole center line of the main spray hole (13a) and the first and second casings (14, 15 ) are on the same straight line, and there are 3 to 5 auxiliary injection holes (13b) on the nozzle (13) along the axial direction. The auxiliary injection holes (13b) are evenly distributed along the circumferential direction on the main nozzle. around the chemical hole (13a), and the hole diameter of the auxiliary injection hole (13b) is 3mm~10mm.

6. The emulsion explosive on-site mixing and charging system suitable for underground engineering according to claim 5, characterized in that: the distance from the upper end of the auxiliary spray hole (13b) to the center line of the main spray hole (13a) is greater than the The distance between the lower end of the auxiliary spray hole (13b) and the center line of the main spray hole (13a), and the sandwich formed between the center line of the auxiliary spray hole (13b) and the hole center line of the main spray hole (13a) The angle is 2°~10°.

7. The on-site mixing and charging system for emulsion explosives suitable for underground engineering according to claim 5 or 6, characterized in that: the inner wall of the second casing (15) is provided with 1 to 5 drain channels ( 15a), the draining groove (15a) is close to the nozzle (13), and the depth of the draining groove (15a) is 1mm~3mm, and the width is 5mm~5mm;

The bottom of each drain channel (15a) has 5 to 20 drain holes (15b) along the circumferential direction, and the hole diameter of the drain holes (15b) is 1 mm to 5 mm.

8. A charging method based on the on-site mixing and charging system of emulsified explosives suitable for underground engineering as claimed in claim Ί, characterized in that: the mixing cavity (5a) of the mixer shell (5) is internally mixed The mixed emulsion explosive is pushed out of the discharge port (5b) of the mixer casing (5) by the radial blade (8), and the pushed out emulsion explosive is pushed out by the pumping pressure of the drug delivery pump (2) Next, first pass through the water ring adding device (3), and introduce lubricating water agent between the inner tube wall of the adding drug delivery hose (4) and the emulsified explosive through the water ring adding device (3); the emulsified explosive is added to the drug delivery pump (2) Encouraged by the pumping pressure and lubricant, along the medicine delivery hose

(4) moves, and finally moves to the discharge end of the upper part of the drug delivery hose (4), and the lubricant on the outside of the emulsion explosive is drained by the drain groove (15a) of the second casing (15) and the drain hole (15b), and the emulsion explosive is finally ejected from the main spray hole (13a) and auxiliary spray hole (13b) of the nozzle (13), and sprayed Toward the blast hole (P);

The diameter of the drug delivery hose (4) is 25mm~40mm, the flow rate of the emulsion explosive in the drug delivery hose (4) is 0.7m/s~3.5m/s, and the emulsion explosive is sprayed out of the nozzle The speed of the main spray hole (13a) of (13) is 2.5m/s~15m/s.