ANFO (ammonium nitrate fuel oil) explosive conveying system capable of continuously operating

Abstract

The invention relates to operation equipment for on-site mixed loading of ammonium nitrate fuel oil explosives, in particular to an ammonium nitrate fuel oil explosive conveying system capable of continuous operation, which comprises two conveyors capable of respectively placing porous granular ammonium nitrate, each conveyor is connected with a hose arranged on a telescopic arm of an ammonium nitrate fuel oil explosive truck, the tail end of the hose is provided with a rotational flow taper pipe, and the tail end of the rotational flow taper pipe is connected with the two conveyors. The rotational flow taper pipe is connected with a static mixing device, and one conveyor is switched to the other conveyor for pneumatic conveying after pneumatic conveying of the porous granular ammonium nitrate to the hose is completed; fuel of the ammonium nitrate fuel oil explosive and porous granular ammonium nitrate pneumatically conveyed by the conveyor are respectively conveyed into the rotational flow taper pipe for rotational flow primary mixing and then flow into the static mixing device for repeated cross mixing, so that the explosive mixing uniformity is improved, and the blasting effect is improved. Meanwhile, by arranging the two conveyors, the pneumatic continuous conveying operation of the ammonium nitrate fuel oil explosives can be achieved, shutdown for feeding is not needed, and the operation efficiency is improved.

Description

Technical Field

[0001] The invention relates to an operating device for mixing and loading ammonium nitrate oil explosive on site, in particular to an ammonium nitrate oil explosive conveying system capable of continuous operation. Background Art

[0002] Ammonium oil-fuel mixture refers to a powdered or granular explosive mixture composed of ammonium nitrate and fuel, which is mainly suitable for blasting projects in the open air and without the danger of methane and mine dust explosion. It includes powdered ammonium oil-fuel mixture, porous granular ammonium oil-fuel mixture, etc. In the blasting engineering industry, in order to improve safety, mixing vehicles are gradually used to achieve on-site mixing of explosives. At present, on-site mixing of ammonium oil-fuel mixture is to transport porous granular ammonium nitrate and fuel to the mixer at the end of the hose respectively, and then transport them to the blasthole, wherein the porous granular ammonium nitrate is generally transported by spiral, which not only has a slow transport speed, but is also prone to blockage; and once the porous granular ammonium nitrate in the silo is transported, it is necessary to stop the machine to add materials to the silo before continuing to transport, and continuous explosives transportation operations cannot be carried out, affecting the progress of the project. At the same time, the existing hose end mixer is not uniform enough for mixing explosives, and when the uneven explosives are transported to the blasthole for blasting, the blasting effect is affected. Summary of the invention

[0003] In view of the above technical problems, the present invention provides an ammonium oil-fuel mixture conveying system which has high conveying efficiency, uniform mixing and can operate continuously.

[0004] The technical solution adopted by the present invention to solve the above technical problems is: a continuously operable ammonium oil-fuel mixture conveying system, which comprises two conveyors for respectively placing porous granular ammonium nitrate, each conveyor is connected to a hose installed on a telescopic arm of an ammonium oil-fuel mixture vehicle, a swirl cone is provided at the end of the hose, and the swirl cone is connected to a static mixing device, one of the conveyors is switched to the other conveyor for pneumatic conveying after pneumatically conveying the porous granular ammonium nitrate to the hose; the fuel of the ammonium oil-fuel mixture and the porous granular ammonium nitrate pneumatically conveyed by the conveyor are respectively conveyed into the swirl cone for swirl initial mixing, and then flow into the static mixing device for repeated cross mixing, and then flow into the blast hole after being collected.

[0005] Preferably, each conveyor comprises a cylindrical shell arranged on the frame of the ammonium oil fuel explosive vehicle, a conical cavity with a large upper diameter and a small lower diameter is provided in the shell, a feed bin is provided on the upper side of the shell, a compartment is formed between the shell and the cavity, a blower unit is installed in the compartment, a discharge channel connected to the hose is provided in the compartment, after the porous granular ammonium nitrate in the feed bin enters the cavity, the heat generated by the blower unit heats the cavity to preheat the porous granular ammonium nitrate, and the wind transported into the cavity by the blower unit blows the porous granular ammonium nitrate to the discharge channel and then enters the hose.

[0006] Preferably, a feed port connected to the feed bin is provided at the top of the cavity, a strong air inlet is provided at the lower side wall of the cavity, a main discharge port and an auxiliary discharge port both connected to the discharge channel are provided at the lower side wall of the cavity located below the strong air inlet, a spiral air induction groove is provided on the inner wall of the cavity, the upper end of the air induction groove is connected to the strong air inlet, the middle part is connected to the main discharge port, and the lower end is connected to the auxiliary discharge port, and a weak air inlet is provided at the bottom end of the cavity. Air outlet; after the porous granular ammonium nitrate enters the cavity from the feed port, the strong wind delivered by the air supply unit through the strong air inlet flows along the air inlet groove to form a vortex flow to blow the porous granular ammonium nitrate flowing toward the lower part of the cavity downward to the main discharge port, and then flows into the discharge channel; the weak wind delivered by the air supply unit through the weak air inlet blows the residual porous granular ammonium nitrate flowing toward the bottom of the cavity upward to the auxiliary discharge port, and then flows into the discharge channel.

[0007] Preferably, a material guide plate is obliquely arranged in the cavity, the lower end of the material guide plate is connected to the auxiliary discharge port, and the higher end is arranged at the lower side of a corresponding section of the air duct, and a plurality of air holes are opened on the material guide plate. Weak wind blows toward the plurality of air holes to blow the residual porous granular ammonium nitrate to the auxiliary discharge port.

[0008] Preferably, an inner wall of the cavity is provided with an installation groove along the circumferential direction, and the periphery of the guide plate is arranged in the installation groove, half of the installation groove coincides with a section of the air induction groove from the auxiliary discharge port to its opposite position, and the other half of the installation groove is symmetrical with the half; a circular opening is provided on the guide plate near the auxiliary discharge port, and clamping strips extend on both sides of the opening respectively, and the two clamping strips are clamped into the auxiliary discharge port, and the axis of the weak air inlet passes through the opening, and the weak wind delivered by the weak air inlet blows toward the opening to blow the residual porous granular ammonium nitrate to the auxiliary discharge port.

[0009] Preferably, the guide plate located in the area where the half section of the installation groove is located is provided with several grooves, each of which extends from the edge of the guide plate to the opening, and the bottom of each groove is provided with several air holes; the inner wall of the cavity is provided with several air guide grooves from the weak air inlet to the installation groove, and a notch is provided on the edge of the guide plate corresponding to each air guide groove, and each of the grooves is connected to a notch.

[0010] Preferably, the top of the outer shell is provided with a cover plate covering the top end of the closed cavity, the feed bin is arranged on the cover plate, and the feed port is opened on the cover plate; the bottom of the outer shell is provided with a bottom plate covering the bottom end of the closed cavity, the weak air inlet is opened on the bottom plate, and the air supply unit includes a strong air supply fan and a weak air inlet fan installed on the bottom plate, the strong air supply fan delivers strong air to the strong air inlet, and the weak air supply fan delivers weak air to the weak air inlet.

[0011] Preferably, the upper end diameter of the swirl cone tube is large and the lower end diameter is small, one side of the upper end of the swirl cone tube is connected to the end of the hose, and the other side of the upper end of the swirl cone tube is connected to a fuel pipe for conveying fuel for ammonium nitrate oil explosive, and the pneumatically conveyed porous granular ammonium nitrate generates a swirl in the inner cavity of the swirl cone tube and is initially mixed with the fuel, and then flows into the middle joint from the lower end of the swirl cone tube, and then flows into the static mixing device from the middle joint.

[0012] Preferably, the static mixing device comprises an outer tube connected to the intermediate joint and a mixing unit arranged in the outer tube, the mixing unit comprises three sections connected in sequence: front, middle and rear sections, each section is spliced ​​into a grid shape by several frames arranged vertically intersecting each other, and the mixture is first dispersed into multiple fluids in the grid shape and then repeatedly cross-mixed in the grid shape.

[0013] Preferably, each section of the grid is formed by splicing two groups of frames that intersect vertically, and each group of frames includes three frames arranged in parallel, one frame in one group of frames includes a frame formed according to the inner wall of the outer tube and three cross bars arranged perpendicular to the frame, each cross bar is vertically connected to the corresponding frame in the other group of frames to form a grid, the three cross bars are connected by two vertically arranged vertical bars, and the two ends of each vertical bar extend to press against the inner wall of the outer tube; each cross bar is divided into three sections, one section is connected to the frame, and the other two sections are respectively connected to two vertical bars.

[0014] As can be known from the above technical scheme, the present invention can realize the pneumatic continuous conveying operation of ammonium nitrate oil explosive by arranging two conveyors, does not need to stop feeding, and improves operating efficiency.Simultaneously, the present invention utilizes the wind pressure of pneumatic conveying porous granular ammonium nitrate to be provided with swirl cone, thereby fuel and porous granular ammonium nitrate are first mixed under swirl effect, then dispersed into multiple streams of fluid by three sections of grid-like static mixing devices and repeatedly cross-mixed, improves the uniformity of explosive mixing, and improves blasting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention.

[0016] Figure 2 It is a schematic cross-sectional structure diagram of a preferred embodiment of the conveyor in the present invention.

[0017] Figure 3 It is a schematic diagram of the installation structure of the material guide plate in the present invention.

[0018] Figure 4 It is a schematic structural diagram of a preferred embodiment of the mixing unit in the present invention.

[0019] Figure 5 It is a structural schematic diagram of one of the frames of the present invention.

[0020] Figure 6 It is a grid-shaped projection schematic diagram of the present invention. DETAILED DESCRIPTION

[0021] The present invention is described in detail below in conjunction with the accompanying drawings. The illustrative embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0022] like Figure 1 As shown, the present invention provides a kind of ammonium oil fuel oil explosive conveying system that can operate continuously, it comprises two conveyors 4 that can place porous granular ammonium nitrate respectively, each conveyor is connected with the hose 101 installed on the telescopic arm of the ammonium oil fuel oil explosive vehicle, the end of the hose is provided with a swirl cone 102, the swirl cone is connected with a static mixing device 41, one of the conveyors switches to another conveyor for pneumatic conveying after pneumatically conveying porous granular ammonium nitrate to the hose, thereby realizing the pneumatic continuous conveying operation of ammonium oil fuel oil explosive. In the implementation process, the switching control can be automatically controlled by installing components such as sensors and solenoid valves, when the sensor detects that the porous granular ammonium nitrate in a conveyor is conveyed, the solenoid valve of the conveyor is controlled to be closed to feed it again; and the solenoid valve of another conveyor is automatically controlled to open, so as to realize continuous conveying. The fuel of the ammonium oil fuel oil explosive and the porous granular ammonium nitrate pneumatically conveyed by the conveyor are respectively conveyed to the swirl cone for swirl initial mixing, and then flow into the static mixing device for repeated cross mixing, and then flow into the blast hole after being collected. Thus, the uniformity of explosive mixing is greatly improved through the initial mixing of the swirl cone and the repeated cross mixing of the static mixing device, ensuring the blasting effect. At the same time, the present invention utilizes the wind pressure of the pneumatically transported porous granular ammonium nitrate to achieve swirl initial mixing, without the need for additional power, thus saving energy consumption and reducing costs.

[0023] like Figure 2 and Figure 3Each conveyor 4 of the present invention comprises a cylindrical shell 5 arranged on the frame of the ammonium oil explosive vehicle, and a conical cavity 1 with a large upper diameter and a small lower diameter is arranged in the shell. This structure can make the porous granular ammonium nitrate gather in the lower part with a smaller space, which is conducive to centralized transportation; a feed bin 6 is arranged on the upper side of the shell, and a compartment 7 is formed between the shell and the cavity, and an air supply unit is installed in the compartment, and a discharge channel 3 connected with the hose is arranged in the compartment. After the porous granular ammonium nitrate in the feed bin enters the cavity, the heat generated by the air supply unit warms the cavity to preheat the porous granular ammonium nitrate, and the wind transported to the cavity by the air supply unit blows the porous granular ammonium nitrate to the discharge channel, and then flows into the hose, and is mixed with the fuel in the swirl cone and the static mixing device to form explosive and then transported to the blasthole. It can be seen that compared with the transmission screw conveying, the present invention realizes pneumatic conveying, which is not only not easy to cause blockage, but also improves the conveying speed, makes the conveying more uniform, and is safer; and the porous granular ammonium nitrate is preheated, thereby improving the uniformity and detonation sensitivity of subsequent explosive mixing.

[0024] Preferably, a feed port 11 connected to the feed bin is provided at the top of the cavity, a strong air inlet 12 is provided at the lower side wall of the cavity, a main discharge port 13 and an auxiliary discharge port 14 both connected to the discharge channel 3 are provided on the lower side wall of the cavity located below the strong air inlet, a spiral air induction groove 15 is provided on the inner wall of the cavity, the upper end of the air induction groove is connected to the strong air inlet, the middle part is connected to the main discharge port, and the lower end is connected to the auxiliary discharge port, and a weak air inlet 16 is provided at the bottom end of the cavity. During the implementation process, after the porous granular ammonium nitrate enters the cavity from the feed port, the strong wind conveyed by the air supply unit through the strong air inlet flows along the air induction groove to form a vortex to blow the porous granular ammonium nitrate flowing to the lower part of the cavity downward to the main discharge port, and then flows into the discharge channel. At the same time, the weak wind conveyed by the air supply unit through the weak air inlet blows the residual porous granular ammonium nitrate flowing to the bottom of the cavity upward to the auxiliary discharge port, and then flows into the discharge channel. Therefore, the present invention realizes the pneumatic conveying of porous granular ammonium nitrate through the dual blowing mode from top to bottom and from bottom to top, which can not only ensure more uniform conveying, but also not easy to be blocked and blow more thoroughly.

[0025] The strong wind used in the present invention refers to the wind delivered by the air supply unit with a relatively large positive pressure, and the weak wind refers to the wind delivered by the air supply unit with a relatively small positive pressure. After the porous granular ammonium nitrate enters the cavity from the top, it will fall downward under the action of its own gravity. When it falls to the lower part of the cavity, a strong wind of swirl can be generated to break it up and evenly transport it downward to the main discharge port. During the implementation process, there may be a small part of the porous granular ammonium nitrate that overcomes the strong wind and falls to the bottom of the cavity under the action of gravity. Therefore, the present invention sets an upward weak wind at the bottom, so as to "lift" the residual porous granular ammonium nitrate, so that it cannot be "precipitated" at the bottom of the cavity, and then blow it to the auxiliary discharge port and "converge" with the porous granular ammonium nitrate in the main discharge port, so as to ensure that the porous granular ammonium nitrate is transported more thoroughly and avoid residue.

[0026] Specifically, a guide plate 2 is obliquely arranged in the cavity 1, and the lower end of the guide plate is connected to the auxiliary discharge port, and the upper end is arranged at the lower side of a corresponding section of the air duct, so that all the residual porous granular ammonium nitrate can fall on the guide plate, and the inclined guide plate can guide the porous granular ammonium nitrate to the auxiliary discharge port, further avoiding the residual porous granular ammonium nitrate; a plurality of air holes 21 are opened on the guide plate 2, and weak wind blows toward the plurality of air holes to blow the residual porous granular ammonium nitrate to the auxiliary discharge port, avoiding the porous granular ammonium nitrate to remain on the guide plate. Preferably, the inner wall of the cavity is provided with a mounting groove 17 along the circumferential direction, the periphery of the guide plate is arranged in the mounting groove, half of the mounting groove coincides with a section of the air induction groove from the auxiliary discharge port to its opposite position, and the other half of the mounting groove is symmetrical with the half, that is, half of the edge of the guide plate is arranged in the air induction groove, and the other half of the edge of the guide plate is arranged on the lower side of the corresponding air induction groove through the symmetrical mounting grooves. When the strong wind blows most of the porous granular ammonium nitrate to the main discharge port, a small part of the strong wind may pass over the main discharge port and flow along the air induction groove of the lower section. Thus, under the action of swirl, the porous granular ammonium nitrate remaining in this section is blown to the guide plate on the lower side by the strong wind. When the strong wind flows to contact the guide plate, the edge of the guide plate in the air duct collides with the strong wind, thereby destroying the swirling effect of the strong wind, and then stopping the strong wind from flowing and guiding it to the guide plate, thereby blowing all the porous granular ammonium nitrate on the guide plate to the auxiliary discharge port at the lower end of the guide plate, completely preventing the porous granular ammonium nitrate from remaining on the guide plate.

[0027] A circular opening 22 is provided on the guide plate 2 near the auxiliary discharge port, and clips 23 extend from both sides of the opening. The two clips are inserted into the auxiliary discharge port, which is not only convenient for placing the guide plate, but also convenient for guiding the porous granular ammonium nitrate to the auxiliary discharge port. During the implementation process, the weak wind at the bottom blows toward the opening to blow the remaining porous granular ammonium nitrate to the auxiliary discharge port. Since the opening is provided on the inclined guide plate, the porous granular ammonium nitrate on the guide plate is easier to flow toward the opening, further avoiding residue, and then under the conveying pressure of the weak wind, the porous granular ammonium nitrate at the opening without any obstruction is completely blown toward the auxiliary discharge port. And the axis of the weak air inlet passes through the opening, thereby ensuring that there is a large air volume at the opening to provide sufficient conveying pressure.

[0028] The present invention provides several grooves 24 on the guide plate 2 located in the area where the half section of the installation groove is located, and each groove extends from the edge of the guide plate to the opening. Since the area corresponding to the half section is difficult to be blown by strong wind, the provision of grooves is conducive to the flow of porous granular ammonium nitrate in this part, ensuring that no residue will remain in this area. Preferably, the bottom of each groove is provided with several air holes 21 to prevent the porous granular ammonium nitrate from remaining at the bottom of the groove. Several air guide grooves 18 are provided on the inner wall of the cavity 1 from the weak air inlet to the installation groove, and a notch 25 is provided on the edge of the guide plate corresponding to each air guide groove, and each of the grooves is connected to a notch, so that weak wind can flow along the air guide groove to the notch, preventing the porous granular ammonium nitrate from remaining in the gap between the installation groove and the guide plate.

[0029] Preferably, the top of the shell 5 is provided with a cover plate 51 covering the top of the closed cavity, the feed bin 6 is arranged on the cover plate, and the feed port is opened on the cover plate; the bottom of the shell is provided with a bottom plate 52 covering the bottom of the closed cavity, thereby the cavity and the compartment are closed by the cover plate and the bottom plate, which can improve the sealing and prevent heat loss; the weak air inlet is opened on the bottom plate, and the air supply unit includes a strong air supply fan 8 and a weak air supply fan 9 installed on the bottom plate, the strong air supply fan delivers strong wind to the strong air inlet, and the weak air supply fan delivers weak wind to the weak air inlet, thereby realizing the classification control of strong and weak wind. In the implementation process, a feed pipe 61 is arranged on the feed bin 6, and the feed bin is funnel-shaped, and its lower end outlet is connected to the feed port, thereby the porous granular ammonium nitrate can be quantitatively transported into the feed bin, and the porous granular ammonium nitrate flows into the cavity from the feed port under the action of gravity, realizing quantitative transportation.

[0030] Specifically, the strong air inlet and the strong air inlet are both arranged on one side of the cavity, and the strong air inlet pipe 81 connecting the strong air inlet and the strong air inlet is tangentially arranged on the outer wall of the cavity on this side to ensure that the strong wind enters the air inlet groove tangentially to achieve the purpose of forming a swirl; the weak air inlet, the main discharge port and the auxiliary discharge port are all arranged on the other side of the cavity. On the one hand, such an arrangement provides heat sources on both sides of the cavity to improve the uniformity of preheating; on the other hand, the space of the compartment is fully utilized and the layout is more reasonable. The discharge channel 3 tangentially arranged on the outer wall of the cavity on the other side is a three-way channel, which is conducive to balancing the layout of the cavity, making air intake and discharge more convenient, thereby increasing the discharge speed and preventing blockage; wherein the two forks of the three-way channel are respectively connected to the main discharge port and the auxiliary discharge port, and the third fork is connected to the discharge pipe 31 installed on the outer wall of the shell. During the implementation process, due to the high conveying pressure of strong wind, a certain negative pressure is formed on the auxiliary discharge port after it enters the discharge channel, thereby making the discharge speed of the auxiliary discharge port faster and smoother, further avoiding material blockage.

[0031] A bottom bin 10 is provided on the lower side of the bottom plate of the present invention, and a weak air inlet pipe 91 connected to the weak air inlet fan passes through the bottom plate into the bottom bin and is connected to the weak air inlet, so that the weak air inlet can be inclined corresponding to the material guide plate to ensure that the axis of the weak air inlet passes through the opening; the bottom of the bottom bin is open, and a filter screen 53 is installed on it, and an air induced draft duct 54 is provided in the bottom bin, and two interfaces at one end of the air induced draft duct are respectively connected to the air inlets of the strong air inlet fan and the weak air inlet fan, and the other end of the air induced draft duct is arranged on the upper side of the filter screen, so that under the action of the air supply unit, the external air is filtered and introduced into the cavity by the air induced draft duct, thereby improving the purity of the wind and ensuring the quality of the porous granular ammonium nitrate. The present invention stores the entire pneumatic system in the bottom bin and the outer shell, which not only makes full use of the waste heat, but also does not install other components on the outside of the entire conveyor except for the control valve, pressure gauge, etc. On the one hand, the volume of the entire conveyor is reduced, reducing the occupied space; on the other hand, it reduces interference with other equipment on the mixed loading vehicle, further improving safety.

[0032] like Figure 4 , Figure 5 and Figure 6The swirl cone 102 of the present invention has a large diameter at the upper end and a small diameter at the lower end. One side of the upper end of the swirl cone is connected to the end of the hose. The other side of the upper end of the swirl cone is connected to a fuel pipe 103 for conveying fuel for ammonium nitrate oil explosive. The porous granular ammonium nitrate conveyed by wind generates a swirl in the inner cavity of the swirl cone and is initially mixed with the fuel, and then flows into the intermediate joint 104 from the lower end of the swirl cone, and then flows into the static mixing device 41 from the intermediate joint. In the implementation process, the end of the upper end of the swirl cone is sealed, and the hose is arranged along the tangent of the swirl cone to ensure that the conveyed porous granular ammonium nitrate generates a swirl in the swirl cone, thereby mixing with the fuel conveyed from the upper end, and then flows into the intermediate joint from the lower end of the swirl cone under the action of the gravity and wind pressure of the mixture.

[0033] The static mixing device 41 of the present invention includes an outer tube 411 connected to the middle joint and a mixing unit 412 arranged in the outer tube, and the mixing unit disperses the mixture after the initial mixing into multiple fluids and repeatedly cross-mixes them. The mixture flowing into the middle joint enters the outer tube and then flows into the mixing unit. The mixing unit includes three sections connected in sequence, namely the front, middle and rear sections, each of which is spliced ​​into a grid shape by several frames 413 arranged vertically intersecting. The mixture is first dispersed into 12 fluids in a grid shape, and then repeatedly cross-mixed in the grid shape, so that the mixture is mixed three times, which greatly improves the uniformity of the mixing. Preferably, the front, middle and rear sections are distributed vertically in pairs to change the flow direction of each mixing, disrupt the flow field law of the mixture, and further improve the uniformity of the mixing.

[0034] In the implementation process, the grid shape of each section is formed by splicing two groups of frames intersecting vertically, and each group of frames includes three frames arranged in parallel to ensure that the mixture can be dispersed into 12 streams of fluid. Preferably, a frame 413 in one group of frames includes a frame 414 formed according to the inner wall of the outer tube and three crossbars 415 arranged vertically to the frame, and each crossbar 415 is vertically connected to the corresponding frame in another group of frames to form a grid shape, so as to achieve repeated cross mixing. The three crossbars are connected by two vertically arranged vertical rods 416, and the two ends of each vertical rod extend to the inner wall of the outer tube, which not only ensures the stability of the whole mixing unit, but also surrounds the grid space of four rows with the outer tube, and each row is divided into three columns by two vertical rods, thereby forming 12 grids, and then the mixture is dispersed into 12 streams of fluid, ensuring that the mixture is fully dispersed, and further improving the uniformity of mixing. Each crossbar is divided into three sections, one of which is connected to the frame, and the other two sections are respectively connected to the two vertical rods. Therefore, the vertical rod and a section of the horizontal rod can be separately set as components, and then formed into an integral mixing unit by welding, and then the mixing unit is inserted into the outer tube to complete the installation. The component splicing method is not only convenient for installation and disassembly, but also conducive to cleaning.

[0035] As can be seen from the above, the present invention first preheats the porous granular ammonium nitrate through a conveyor, and pre-disperses the porous granular ammonium nitrate by means of wind blowing, and then conveys it to the vortex cone for initial mixing with the fuel, and then repeatedly cross-mixes it through a static mixing device. It can be seen that the conveying system of the present invention adopts a three-mixing method of pre-dispersion, initial mixing, and repeated cross-mixing, which greatly improves the uniformity of the explosive mixing and improves the blasting effect; at the same time, the wind pressure also has a preheating effect, which improves the detonation sensitivity.

Claims

1. A continuously operable ammonium nitrate oil explosive conveying system, comprising two conveyors for respectively placing porous granular ammonium nitrate, characterized in that: Each conveyor is connected to a hose installed on a telescopic arm of an ammonium oil fuel oil explosive vehicle, a swirl cone is provided at the end of the hose, and the swirl cone is connected to a static mixing device. After one conveyor pneumatically conveys porous granular ammonium nitrate to the hose, it switches to another conveyor for pneumatic conveyance; the fuel of the ammonium oil fuel oil explosive and the porous granular ammonium nitrate pneumatically conveyed by the conveyor are respectively conveyed into the swirl cone for swirl initial mixing, and then flow into the static mixing device for repeated cross mixing, and then flow into the blast hole after being collected.

2. according to the described ammonium nitrate oil explosive delivery system of continuous operation of claim 1, it is characterized in that: Each conveyor includes a cylindrical shell arranged on the frame of the ammonium nitrate oil explosive vehicle, a conical cavity with a large upper diameter and a small lower diameter is arranged in the shell, a feed bin is arranged on the upper side of the shell, a compartment is formed between the shell and the cavity, a blower unit is installed in the compartment, a discharge channel connected to the hose is arranged in the compartment, after the porous granular ammonium nitrate in the feed bin enters the cavity, the heat generated by the blower unit heats the cavity to preheat the porous granular ammonium nitrate, and the wind transported into the cavity by the blower unit blows the porous granular ammonium nitrate to the discharge channel and then enters the hose.

3. according to the described ammonium nitrate oil explosive delivery system of continuous operation of claim 2, it is characterized in that: The top of the cavity is provided with a feed port connected to the feed bin, the lower side wall of the cavity is provided with a strong air inlet, the lower side wall of the cavity is provided with a main discharge port and an auxiliary discharge port both connected to the discharge channel, located below the strong air inlet, a spiral air induction groove is provided on the inner wall of the cavity, the upper end of the air induction groove is connected to the strong air inlet, the middle part is connected to the main discharge port, and the lower end is connected to the auxiliary discharge port, and the bottom end of the cavity is provided with a weak air inlet After the porous granular ammonium nitrate enters the cavity from the feed port, the strong wind delivered by the air supply unit through the strong air inlet flows along the air duct to form a vortex flow to blow the porous granular ammonium nitrate flowing toward the lower part of the cavity downward to the main discharge port, and then flows into the discharge channel. The weak wind delivered by the air supply unit through the weak air inlet blows the residual porous granular ammonium nitrate flowing toward the bottom of the cavity upward to the auxiliary discharge port, and then flows into the discharge channel.

4. according to the described ammonium nitrate oil explosive delivery system of continuous operation of claim 3, it is characterized in that: A material guide plate is obliquely arranged in the cavity, wherein the lower end of the material guide plate is connected to the auxiliary discharge port, and the higher end of the material guide plate is arranged at the lower side of a corresponding section of the air duct. A plurality of air holes are opened on the material guide plate, and weak wind blows toward the plurality of air holes to blow the residual porous granular ammonium nitrate to the auxiliary discharge port.

5. according to the described ammonium nitrate oil explosive delivery system of continuous operation of claim 4, it is characterized in that: An inner wall of the cavity is provided with a mounting groove along the circumferential direction, and the periphery of the guide plate is arranged in the mounting groove, half of the mounting groove coincides with a section of the air induction groove from the auxiliary discharge port to the opposite position thereof, and the other half of the mounting groove is symmetrical with the half; a circular opening is provided on the guide plate near the auxiliary discharge port, and clamping strips extend on both sides of the opening respectively, and the two clamping strips are clamped into the auxiliary discharge port, and the axis of the weak air inlet passes through the opening, and the weak wind delivered by the weak air inlet blows toward the opening to blow the residual porous granular ammonium nitrate to the auxiliary discharge port.

6. according to the described ammonium nitrate oil explosive delivery system of continuous operation of claim 5, it is characterized in that: The guide plate located in the area where the half section of the installation groove is located is provided with several grooves, each of which extends from the edge of the guide plate to the opening, and the bottom of each groove is provided with several air holes; the inner wall of the cavity is provided with several air guide grooves from the weak air inlet to the installation groove, and a notch is provided on the edge of the guide plate corresponding to each air guide groove, and each of the grooves is connected to a notch.

7. according to the described ammonium nitrate oil explosive delivery system of continuous operation of claim 3, it is characterized in that: The top of the shell is provided with a cover plate covering the top end of the cavity, the feed bin is arranged on the cover plate, and the feed port is opened on the cover plate; the bottom of the shell is provided with a bottom plate covering the bottom end of the cavity, the weak air inlet is opened on the bottom plate, and the air supply unit includes a strong air supply fan and a weak air inlet fan installed on the bottom plate, the strong air supply fan delivers strong air to the strong air inlet, and the weak air supply fan delivers weak air to the weak air inlet.

8. According to any one of claims 1 to 7, the continuously operable ammonium nitrate oil fuel delivery system is characterized in that: The upper end diameter of the swirl cone tube is large and the lower end diameter is small. One side of the upper end of the swirl cone tube is connected to the end of the hose, and the other side of the upper end of the swirl cone tube is connected to a fuel pipe for conveying fuel for ammonium nitrate oil explosive. The porous granular ammonium nitrate conveyed by pneumatic means generates a swirl in the inner cavity of the swirl cone tube and is initially mixed with the fuel, and then flows into the middle joint from the lower end of the swirl cone tube, and then flows into the static mixing device from the middle joint.

9. The continuously operable ammonium nitrate oil explosive delivery system according to claim 8, wherein: The static mixing device includes an outer tube connected to the middle joint and a mixing unit arranged in the outer tube. The mixing unit includes three sections, namely front, middle and rear sections, which are connected in sequence. Each section is spliced ​​into a grid shape by several frames arranged vertically intersecting each other. The mixture is first dispersed into multiple fluids in the grid shape and then repeatedly cross-mixed in the grid shape.

10. The continuously operable ammonium nitrate oil explosive delivery system according to claim 9, wherein: Each section of the grid is formed by splicing two groups of frames that intersect vertically, and each group of frames includes three frames arranged in parallel. One frame in one group of frames includes a frame formed according to the inner wall of the outer tube and three cross bars arranged perpendicular to the frame. Each cross bar is vertically connected to the corresponding frame in the other group of frames to form a grid. The three cross bars are connected by two vertically arranged vertical bars, and the two ends of each vertical bar extend to press against the inner wall of the outer tube; each cross bar is divided into three sections, one of which is connected to the frame, and the other two sections are respectively connected to two vertical bars.

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