Liquid oxygen gas explosion system and working method

Abstract

The application relates to the field of blasting technology, and discloses a liquid oxygen gas explosion system and a working method, wherein the liquid oxygen gas explosion system comprises a liquid oxygen supply unit, a mother pipe and a plurality of liquid injection main pipes which are sequentially connected; a plurality of liquid oxygen blasting units are distributed on each liquid injection main pipe; and an electric detonation unit is connected with each liquid oxygen blasting unit. The liquid oxygen gas explosion system and the working method have intrinsic safety, high efficiency and green environmental protection, are a new type of blasting rock breaking technology and method which are truly safe, efficient, green and environmentally-friendly, and solve the problem that, although there are many domestic gas explosion related technologies and construction processes at present, a liquid oxygen gas explosion system and a construction process method which are complete in system, safe and efficient and have strong operability are lacked.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of blasting technology, in particular to a liquid oxygen gas explosion system and working method. BACKGROUND

[0002] The methods for breaking rock mainly include explosive blasting, carbon dioxide gas explosion, mechanical breaking, hydraulic breaking, etc. Among them, the explosive blasting has the lowest cost and is most widely used. However, in some complex and sensitive areas (such as areas near highways, railways, water conservancy and hydropower, ancient buildings, residential areas, etc.), when rock breaking is carried out, the ordinary explosive blasting has high blast speed and great power, which will produce great blast vibration, flying stones, noise, dust, air shock wave, toxic and harmful gas, etc. on land, and will produce great blast vibration, underwater shock, toxic and harmful gas, surge, etc. under water, thereby easily causing some secondary disasters. Compared with the explosive blasting, the methods of mechanical breaking, hydraulic breaking or carbon dioxide gas explosion have less harmful effects, but have low efficiency, high cost and long construction period, which are not conducive to large-scale rock breaking in engineering. Although the liquid oxygen gas explosion has lower efficiency than the explosive blasting, it has much higher efficiency than the carbon dioxide gas explosion, mechanical breaking and hydraulic breaking, and is a truly safe, efficient, green and environmentally friendly blasting process. SUMMARY

[0003] To achieve the above purpose, the present application discloses a liquid oxygen gas explosion system, which comprises a liquid oxygen supply unit, a mother pipe and a plurality of liquid injection main pipes connected in sequence, a plurality of liquid oxygen blasting units are distributed on each liquid injection main pipe, and an electric initiation unit connected with each liquid oxygen blasting unit.

[0004] Preferably, the liquid oxygen supply unit comprises a Dewar flask, a booster valve and a liquid injection valve installed on the Dewar flask, and the liquid injection valve is connected with the mother pipe through a high-pressure metal hose.

[0005] Preferably, the mother pipe is a steel pipe with both ends plugged, the inner diameter of the mother pipe is greater than that of the high-pressure metal hose, the inner diameter of the mother pipe is 15-20 mm, the outer surface of the mother pipe is wrapped with a plurality of temperature insulation layers, the mother pipe is provided with a liquid inlet connected with the high-pressure metal hose and a liquid outlet connected with each liquid injection main pipe.

[0006] Preferably, the liquid injection main pipe is an aluminum round pipe, the inner diameter of the liquid injection main pipe is 8-10 mm, at least three liquid injection main pipes are connected with the mother pipe and form a closed-loop liquid injection main pipe network through a large tee joint and a straight-through connection.

[0007] Preferably, the liquid oxygen blasting unit comprises: a liquid injection branch pipe connected with the liquid injection main pipe through a small tee, the liquid injection branch pipe being an aluminum material round pipe, the inner diameter of the liquid injection branch pipe being 6-8 mm, a fracturing device being connected with the liquid injection branch pipe, the fracturing device comprising a shell, the material of the shell comprising but not limited to a PE or PA12 bag, a PE round pipe, a high polymer polyethylene round pipe, and a glass steel round pipe, the liquid injection branch pipe extending into the shell, a plurality of special paper cores being arranged in the shell and sleeved on the liquid injection branch pipe, the height of the special paper core being between 200-500 mm, and the diameter being between 70-120 mm, an electric ignition head being mounted on the shell and connected with the electric initiation unit, and an exhaust pipe being mounted on a wire harness pipe for penetrating the electric ignition head.

[0008] Preferably, the electric initiation unit comprises a high-energy pulse initiator, the connection end of the high-energy pulse initiator being connected with each liquid oxygen blasting unit through an initiation network, the initiation network comprising the electric ignition head, a foot wire, a connection wire between blast holes, and a blasting bus.

[0009] The application further discloses a working method of liquid oxygen gas explosion, which applies the liquid oxygen gas explosion system.

[0010] Step 1: a plurality of rows of blast holes are formed at the preset positions of target rocks.

[0011] Step 2: the fracturing device is assembled and placed in the blast hole, the liquid injection branch pipe, the exhaust pipe, and the electric ignition wire harness extending out of the hole of the blast hole by at least 50 cm, and the blast hole is filled.

[0012] Step 3: a liquid injection main pipe network for connecting the liquid injection main pipe and the Dewar jar is formed through a large tee and a straight-through connection, and each fracturing device and the high-energy pulse initiator are connected in series through the initiation network.

[0013] Step 4: gas explosion pre-warning is performed, after confirming that the gas explosion area is cleared, the booster valve and the liquid injection valve are sequentially opened to inject liquid oxygen, the Dewar jar is pressurized, liquid oxygen flows in the liquid injection main pipe network, and is injected into the fracturing device through the liquid injection branch pipe, after the fracturing device is filled, the booster valve and the liquid injection valve are closed, the liquid injection main pipe network is disconnected, the liquid injection main pipe and the hose are retrieved, and the liquid injection main pipe and the hose and the Dewar jar are well covered and protected.

[0014] Step 5: the blasting operator uses the high-energy pulse initiator to initiate each fracturing device, and after the blast smoke is dissipated, it is checked whether there is a blind blast.

[0015] Preferably, in step 1, a plurality of rows of blast holes are drilled at the preset positions of the target rock by a drilling device, the drilling device comprises a moving trolley and a drilling assembly mounted on the moving trolley through a lifting assembly, the lifting assembly comprises an upper lifting plate and a lower lifting plate arranged in a top-bottom mode, the lower lifting plate is mounted on the top end of the moving trolley through a pad plate, the drilling assembly is mounted on the upper lifting plate, two groups of lifting cylinders are symmetrically connected between the upper lifting plate and the lower lifting plate with the drilling assembly as the center, the drilling assembly comprises a fixing seat connected with the upper lifting plate, a drilling motor located in the fixing seat and a main drill bit mounted on the output end of the drilling motor, the main drill bit penetrates the lower lifting plate, the pad plate and the moving trolley in sequence, a rotating shell is rotatably mounted with a fixing sleeve, and the fixing sleeve is sleeved on the output end of the drilling motor.

[0016] Preferably, the fixing sleeve is connected with the fixing seat, an inner fixing plate is fixedly mounted on the inner wall of the rotating shell, an inner sliding plate is slidably mounted on the inner wall of the rotating shell, the fixing sleeve penetrates the inner fixing plate and the inner sliding plate, a return spring is sleeved on the fixing sleeve and connected between the inner fixing plate and the inner sliding plate, four screw blocks form a ring structure, an outer thread matched with the screw blocks is formed on the fixing sleeve, a fixing frame is connected between the output end of the drilling motor and the inner wall of the rotating shell, the screw blocks are resettable mounted on the inner sliding plate, four cutting plates form a tubular structure and are connected with the screw blocks in sequence through connecting rods, and the fixing sleeve is mounted with a ring-shaped top block matched with the screw blocks at the end away from the fixing seat.

[0017] Preferably, the side fixing shell is embeddedly mounted on the side end of the rotating shell, a side rotating shaft is rotatably mounted on the side fixing shell, one end of the side rotating shaft extends into the rotating shell and is connected with the fixing sleeve through a pair of meshing bevel gears, the other end of the side rotating shaft is mounted with a rotating rod, the rotating rod is mounted with a pushing block, the pushing block is slidably connected in the transmission frame, a spraying box is fixedly mounted on the side end of the rotating shell, an elastic capsule is mounted in the spraying box, a spraying head with a one-way valve is mounted on the spraying box and connected with the elastic capsule, a pressing plate is located in the spraying box and presses the elastic capsule, one end of a vertical rod is connected with the transmission frame, the other end of the vertical rod extends into the spraying box and is connected with the pressing plate, and the side fixing shell is provided with a blowing blade mounted on the side rotating shaft. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the description of the specific embodiments or the prior art. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor based on these drawings.

[0019] Figure 1 It is a schematic diagram of the liquid oxygen gas explosion system of the present application;

[0020] Figure 2Structure diagram of the fracturing device of the present application;

[0021] Figure 3 Structure diagram of the special paper core of the present application;

[0022] Figure 4 Flowchart of the working method of the liquid oxygen gas explosion of the present application;

[0023] Figure 5 Structure diagram of the drilling device of the present application;

[0024] Figure 6 Structure diagram of the drilling assembly of the present application;

[0025] Figure 7 Sectional view of the drilling assembly of the present application Figure 1 ;

[0026] Figure 8 Pressing diagram of the elastic capsule of the present application;

[0027] Figure 9 Sectional view of the drilling assembly of the present application Figure 2 ;

[0028] Figure 10 Cutting plate action diagram of the present application.

[0029] In the figure: 1. Dewar flask; 2. Booster valve; 3. Liquid injection valve; 4. High-pressure metal hose; 5. Main pipe; 6. Main liquid injection pipe; 7. Large tee joint; 8. Straight pipe; 9. Small tee joint; 10. Branch liquid injection pipe; 11. Fracturing device; 11-1. Shell; 11-3. Exhaust pipe; 11-4. Electric ignition head; 11-5. Special paper core; 12. Fixed nut; 13. Initiating network; 14. Connection end; 15. Electric initiation unit; 16. Reset spring; 20. Moving trolley; 21. Drilling assembly; 22. Upper lifting plate; 23. Lower lifting plate; 24. Lifting cylinder; 25. Fixed seat; 26. Drilling motor; 27. Main drill bit; 28. Fixed sleeve; 29. Rotating shell; 30. Inner fixed plate; 31. Inner sliding plate; 32. Screw block; 33. Fixed frame; 34. Cutting plate; 35. Connecting rod; 36. Annular top block; 37. Side fixed shell; 38. Side rotating shaft; 39. Bevel gear; 40. Rotating rod; 41. Push block; 42. Transmission frame; 43. Spraying box; 44. Elastic capsule; 45. Spraying head; 46. Pressing plate; 47. Vertical rod; 48. Air supply blade. DETAILED DESCRIPTION

[0030] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0031] Embodiments

[0032] The present application will be further described below in conjunction with the drawings.

[0033] As Figure 1 shown, the liquid oxygen gas explosion system provided by the embodiment includes a liquid oxygen supply unit, a mother pipe 5 and a plurality of liquid injection main pipes 6 connected in sequence, each of the liquid injection main pipes 6 is distributed with a plurality of liquid oxygen blasting units, and further includes an electric detonation unit 15 connected with each of the liquid oxygen blasting units.

[0034] The working principle and beneficial effects of the above technical solution are as follows:

[0035] The liquid oxygen gas explosion system provided by the present application has the following advantages: the liquid oxygen blasting unit is buried in a blast hole and connected with the mother pipe 5 through the liquid injection main pipe 6, the mother pipe 5 is connected with the liquid oxygen supply unit, thereby forming a liquid injection main pipe network. After the liquid oxygen supply unit is opened, liquid oxygen is sent into the liquid oxygen blasting unit buried in the blast hole, and the electric detonation unit 15 controls the liquid oxygen blasting unit connected in series to realize blasting operation. The liquid oxygen gas explosion system disclosed by the present application has intrinsic safety, high efficiency and green environmental protection. In particular, in special areas or places where the use of explosives is prohibited (or limited), the present application does not need complicated approval and does not use civilian explosive materials, and can solve the problem of rapid rock breaking. Moreover, the present application has higher efficiency and lower cost than the non-explosive rock breaking methods such as rock breaking hammer, splitting machine, cement expanding agent and carbon dioxide gas explosion, and has more advantages. The present application is a new type of blasting rock breaking technology and method which is truly safe, efficient, green and environmentally friendly, and solves the problem that although there are many gas explosion related technologies and construction processes in China at present, there is still a lack of a complete, safe, efficient and operable liquid oxygen gas explosion system and construction process method.

[0036] In one embodiment, the liquid oxygen supply unit includes a Dewar flask 1, a booster valve 2 and a liquid injection valve 3 installed on the Dewar flask 1, and the liquid injection valve 3 is connected with the mother pipe 5 through a high-pressure metal hose 4.

[0037] The working principle and beneficial effects of the above technical solution are as follows:

[0038] The Dewar 1 is a movable low-temperature adiabatic pressure container with high-vacuum multi-layer adiabatic, mainly used for storing, transporting and using medium such as liquid oxygen, and can provide continuous liquid. It is mainly composed of a stainless steel inner container, a stainless steel outer shell, a support structure, an internal booster, an internal vaporizer and a valve pipeline and a safety system. The Dewar 1 adopts a high-vacuum multi-layer winding adiabatic structure, the inner container is used to store low-temperature liquid, the outer wall is wound with multi-layer adiabatic material, has super strong heat insulation performance, and the interlayer (the space between the two containers) is also pumped into high vacuum, which together form a good adiabatic system. It has the characteristics of safety and reliability, easy to use, high loading rate, and can be refilled repeatedly. In order to facilitate safe loading, unloading and moving on the construction site, a steel tool frame is arranged on the periphery of the Dewar. In order to prevent damage to the Dewar valve instrument and the stainless steel shell during operation, a 3mm thick steel plate protection layer is welded on the steel frame. The booster valve 2 is mainly used for Dewar pressure boosting during gas explosion operation, the liquid injection valve 3 is mainly used for controlling the amount of liquid oxygen added to the liquid oxygen gas explosion system during gas explosion operation, and the high-pressure metal hose 4 is used to connect the liquid injection valve 3 and the mother pipe 5. The inner diameter is consistent with the hole diameter of the liquid injection valve 3, and is generally 10mm.

[0039] In one embodiment, the mother pipe 5 is a steel pipe with both ends plugged, the inner diameter of the mother pipe 5 is larger than that of the high-pressure metal hose 4, the inner diameter of the mother pipe 5 is 15-20mm, and the outer surface of the mother pipe 5 is wrapped with a plurality of temperature insulation layers. The mother pipe 5 is provided with a liquid inlet connected with the high-pressure metal hose 4 and a liquid outlet connected with each liquid injection main pipe 6.

[0040] The working principle and beneficial effects of the above technical solution are:

[0041] The mother pipe 5 is a section of steel pipe with both ends plugged (the length is generally 60-100cm), and the inner diameter is larger than that of the high-pressure metal hose 4, generally 15-20mm. The mother pipe 5 has a plurality of liquid inlets and outlets, which are respectively connected with the high-pressure metal hose 4 and the liquid injection main pipe 6. The outer surface of the pipe body of the mother pipe 5 has a plurality of temperature insulation layers to reduce the heat exchange between the low-temperature liquid oxygen in the mother pipe 5 and the surrounding medium as much as possible. It is mainly used to balance the liquid oxygen pressure output by multiple Dewars 1, improve the liquid injection efficiency of the liquid oxygen gas explosion system, and reduce the liquid injection operation time.

[0042] In one embodiment, the liquid injection main pipe 6 is an aluminum material round pipe, the inner diameter of the liquid injection main pipe 6 is 8-10mm, at least three liquid injection main pipes 6 are connected with the mother pipe 5, and are connected with each other through a large three-way valve 7 and a straight-through valve 8 to form a closed-loop liquid injection main pipe network.

[0043] As Figure 2 , Figure 3As shown, in one embodiment, the liquid oxygen blasting unit comprises: a liquid injection branch pipe 10 connected with the liquid injection main pipe 6 through a small tee joint 9, the liquid injection branch pipe 10 is an aluminum material round pipe, the inner diameter of the liquid injection branch pipe 10 is 6-8mm, a fracturing device 11 is connected with the liquid injection branch pipe 10, the fracturing device 11 comprises a shell 11-1, the material of the shell 11-1 comprises but is not limited to a PE or PA12 bag, a PE round pipe, a high polymer polyethylene round pipe, a glass steel round pipe, the liquid injection branch pipe 10 extends into the shell 11-1, a plurality of special paper cores 11-5 are arranged in the shell 11-1 and sleeved on the liquid injection branch pipe 10, the height of the special paper core 11-5 is between 200-500mm, the diameter is between 70-120mm, an electric ignition head 11-4 connected with an electric initiation unit 15 is installed on the shell 11-1, and an exhaust pipe 11-3 is installed on a wire harness pipe for penetrating the electric ignition head 11-4.

[0044] The working principle and beneficial effects of the above technical solution are:

[0045] The special paper core 11-5 is ignited by the ignition head in the oxygen-rich environment, burns quickly, generates a large amount of heat, the liquid oxygen in the fracturing device 11 is vaporized by the heat, and the expanded gas breaks the rock. The special paper core 11-5 uses recycled waste paper, crop straw, and garden pruning branches as raw materials, replacing the original national standard toilet paper, reducing many processes such as bleaching, disinfection, etc. in the production process of the original toilet paper, saving energy consumption, and more importantly, reducing the generation of toxic and harmful substances in the production process, which is conducive to achieving the goal of energy saving, green, and environmental protection of liquid oxygen gas explosion.

[0046] It needs to be emphasized that:

[0047] 1. The special paper core is rolled into a cylindrical shape, and the cylindrical diameter usually adopts several specifications such as 120mm, 90mm, and 70mm. For the convenience of processing and transportation, and the convenience of gas explosion operation, the single roll length is generally 200mm, 300mm, and 500mm.

[0048] 2. In order to expand the contact area of the special paper core and the liquid oxygen, increase the adsorption and oxygen saturation of the paper core and the liquid oxygen, the paper core structure is loose, and the porosity is larger than that of general toilet paper. The rolled paper is a multi-layer structure, and the paper core should not be rolled too tightly, but should have a certain degree of relaxation.

[0049] 3. In order to facilitate the insertion of the liquid injection branch pipe during the processing of the gas explosion fracturing device, the center of the special paper core usually has a hollow.

[0050] 4. The special paper core replaces the original national standard toilet paper, reduces many processes such as bleaching, disinfection, and sterilization in the production process of the original toilet paper, saves energy consumption, and more importantly, reduces the generation of toxic and harmful substances in the production process, to a certain extent, achieves the goal of energy saving, green, and environmental protection in the production process.

[0051] 5. The main raw materials for producing special paper cores are recycled waste paper, crop straw, and garden branches, with a small amount of toner added. All raw materials are recycled, which is another concrete manifestation of achieving energy-saving, green, and environmentally friendly goals.

[0052] 6. The special paper core replaces the original national standard toilet paper, which is cheaper (by about 25% or more), effectively reducing the process cost of liquid oxygen explosion and facilitating the promotion and engineering application of liquid oxygen explosion technology.

[0053] In one embodiment, the electric detonation unit 15 includes a high-energy pulse detonator. The connection end 14 of the high-energy pulse detonator is connected to each liquid oxygen blasting unit through the detonation network 13. The detonation network 13 includes an electric ignition head, lead wire, borehole connection wire, and detonation busbar.

[0054] like Figure 4 As shown, this embodiment also provides a method for operating a liquid oxygen explosion, which utilizes the liquid oxygen explosion system described above, and includes the following steps:

[0055] Step 1: Drill multiple rows of blast holes at the predetermined locations on the target rock;

[0056] Specifically, when opening multiple blast holes, the hole spacing and row spacing are generally smaller than those used in traditional explosive blasting, while the hole depth is basically the same as that used in traditional explosive blasting.

[0057] Step 2: Assemble the fracturing device 11 and place it into the borehole. The injection branch pipe 10, the exhaust pipe 11-3, and the electric ignition wire harness should extend at least 50cm out of the borehole opening and fill the borehole.

[0058] Specifically, based on factors such as borehole diameter, borehole depth, rock conditions, borehole spacing, blasting requirements, and surrounding environment at the gas explosion site, the diameter and length of the fracturing device 11 for each borehole are determined. A liquid injection branch pipe 10 (usually greater than 1m in depth) is cut for each borehole depth. At the location where the liquid injection branch pipe 10 is planned to be inserted into the fracturing device 11, several through-holes are drilled at certain intervals (usually 40-60cm) using a hand drill. Then, several liquid oxygen explosion-specific paper cores 11-5 are threaded onto the liquid injection branch pipe 10. At least two electric ignition heads 11-4 are placed and fixed at intervals on the special paper cores 11-5, and the electric ignition heads 11-4 are connected. The wiring terminals are tightly wrapped with electrical tape. Use a special PE or PA12 bag for gas explosions. Put the above-processed liquid injection branch pipe 10 and special paper core 11-5 into the PE or PA12 bag. One end of the bag has the liquid injection branch pipe, exhaust pipe and electric ignition wire bundled together. Then seal both ends of the bag.

[0059] The assembly device for cracking 11 can be assembled on site according to the actual depth of the blast hole, environment, blasting requirements and other factors, or the assembly device for cracking 11 can be assembled according to certain common specifications in advance and then transported to the site for use;

[0060] The assembled cracking device 11 is loaded into the blast hole, and generally more than two people work together. During operation, pay attention to prevent soil and rock from entering the hole, do not force it into the hole, and pay attention to avoid damaging the liquid oxygen cracking device outer package thickening PE or PA12 bag. The liquid injection branch pipe, exhaust pipe and electric ignition wire pipeline bundle should be stretched out of the hole by at least 50 cm;

[0061] The hole section of the cracking device blast hole is filled. The filling material is soil, rock powder and other site materials, and stone blocks, stones and other materials should not be used. The filling should be dense. The blocking of the water blast hole should use fine sand, quick-drying cement, gypsum and other materials. The length of the blocking should be greater than the minimum resistance line of the blast hole, to ensure that the blast gas does not escape from the hole too early, affecting the gas explosion energy utilization rate. Do not damage the bag, liquid injection branch pipe, exhaust pipe and electric ignition wire in the hole during filling;

[0062] Step 3, connect the large three-way pipe 7 and the straight pipe 8 to form a closed loop liquid injection main pipe network for connecting the liquid injection main pipe 6 and the Dewar flask 1, and then connect each cracking device 11 and the high-energy pulse initiator through the detonation network 13 in series;

[0063] Specifically, the Dewar flask 1, high-pressure metal hose 4, mother pipe 5, liquid injection main pipe 6, liquid injection branch pipe 10 and cracking device 11 prepared in advance are connected through large and small three-way pipes, straight pipes, fixed nuts, sealing rings and other special connecting components for gas explosion inflation pipe network to form a closed loop liquid injection main pipe network. Each connection part should be firm, sealed and airtight;

[0064] Connect the electric ignition line, connect the electric ignition lines of each blast hole in series with copper core double-stranded wire, and then connect into the detonation station with copper core double-stranded wire, and hand over to the blasting operator for detection;

[0065] Step 4, gas explosion warning, after confirming that the gas explosion area is clear, open the pressure increasing valve 2 and the liquid injection valve 3 in an orderly manner to fill liquid oxygen, increase the pressure in the Dewar flask 1, circulate liquid oxygen in the liquid injection main pipe network, and fill liquid oxygen into the cracking device 11 through the liquid injection branch pipe. After the liquid injection main pipe network is disconnected, the liquid injection mother pipe and the hose are retracted, and the Dewar flask 1 is covered and protected;

[0066] Specifically, the on-site person in charge issues a gas explosion early warning signal after checking and confirming that the liquid injection main pipe network is connected and unblocked, and the electric ignition circuit is normal. The gas explosion area starts to clear the site, and the warning personnel are in place according to the pre-prepared plan. According to experience, the liquid oxygen gas explosion safety warning range is generally not less than 50 meters, and when the mountain gas explodes, the influence of rolling stones should also be considered, and the safety range should be appropriately increased. Except for the necessary perfusion operation personnel and equipment, other personnel and equipment are withdrawn from the warning area, and safety protection measures are taken for part of the equipment that cannot be moved;

[0067] The on-site person in charge issues a start liquid oxygen perfusion instruction after checking and confirming that the warning personnel are in place and the warning area has been cleared according to the requirements. The operator first wears the gas explosion operation special safety protection suit, opens the pressure valve of the Dewar flask, opens the liquid injection valve of the Dewar flask, and a series of operations according to the gas explosion operation procedure, and perfuses liquid oxygen into the fracturing device through the liquid injection main pipe network; During the perfusion process, the system working state should be observed, and if any abnormality is found, the liquid oxygen perfusion operation should be terminated immediately;

[0068] After the liquid oxygen in the liquid injection main pipe network is perfused for several minutes (the time is mainly affected by the number, diameter, length, etc. of the liquid oxygen perfused fracturing device), the on-site technician comprehensively determines that all the fracturing devices in the blast hole have completed the liquid oxygen perfusion according to the pressure gauge indication of the Dewar flask and the working state of the exhaust pipe of the fracturing device, and immediately issues a termination instruction. The operator closes the pressure valve and liquid injection valve of the Dewar flask in an orderly manner, locks the liquid injection main pipe with a gas explosion pipe network special clamp, and cuts off the connection between the liquid injection main pipe and the mother pipe;

[0069] The mother pipe and the hose are withdrawn, and the Dewar flask, the mother pipe and the hose are covered and protected as required, and the operator quickly withdraws from the warning area;

[0070] Step 5, the blaster uses a high-energy pulse initiator to detonate each fracturing device 11, and checks for blind shots after the smoke dissipates.

[0071] Specifically, the on-site person in charge issues a detonation command after confirming that the warning area has been cleared and each warning point reports safety, and the blaster uses a high-energy pulse initiator to ignite and detonate according to the specified procedure;

[0072] After detonation, wait for 5 minutes or until the smoke dissipates, and then the technician enters the construction site to check for blind shots. If it cannot be confirmed, wait for 30 minutes, confirm safety, and issue a release signal, and each warning point is released to withdraw.

[0073] The working principle and beneficial effects of the above technical scheme are:

[0074] The working method of liquid oxygen gas explosion disclosed in the application comprises the following steps: opening holes, a plurality of rows of blast holes are opened at the preset positions of target rocks; assembling a cracking device 11, the cracking device 11 is assembled according to the caliber size of the blast hole, the depth of the blast hole, the nature of the rock, the size of the hole row distance, the blasting requirements, the surrounding environment and other factors; the assembled cracking device 11 is placed into the blast hole; the cracking device 11 in the blast hole is packed; a complete closed-loop liquid injection pipe network is formed by connecting the Dewar flask 1, the high-pressure metal hose 4, the mother pipe 5, the liquid injection main pipe 6, the liquid injection branch pipe 10 and the cracking device 11 through the straight-through pipe 8, the large three-way pipe 7, the small three-way pipe 9, the nut and the snap ring; liquid oxygen is injected into the cracking device 11 in the blast hole through a series of operations such as opening the pressure booster valve 2 and the liquid injection valve 3; after several minutes, the pressure of the Dewar flask and the working state of the exhaust pipe 11-3 of the cracking device 11 in the blast hole are comprehensively judged to determine whether the liquid injection into all the cracking devices 11 in the blast holes is completed; the pressure booster valve 2 and the liquid injection valve 3 are closed; the liquid injection main pipe 6 is locked by using the gas explosion special clamp and is cut off; the mother pipe 5 is retracted; personnel and equipment are removed; the high-energy pulse initiator is checked; and ignition and explosion are performed under the condition that the electric initiation unit 15 meets the ignition condition. The liquid oxygen gas explosion special paper core 11-5 in the cracking device 11 is ignited, the ignited special paper core 11-5 burns rapidly in the surrounding oxygen-rich environment, a large amount of heat is generated, the liquid oxygen in the cracking device 11 is vaporized by heat, the rapidly expanded gas generates high pressure stress in the blast hole, and the rock around the blast hole is broken.

[0075] Advantage one, the application has intrinsic safety. The liquid oxygen gas explosion is caused by the vaporization of the liquid oxygen in the cracking device due to physical volume change, no detonator, explosive and other civilian explosive materials are used, no explosion shock wave and toxic and harmful gas is generated, and the blasting vibration peak is low; the used equipment has no controlled materials and adopts the in-hole filling technology, thereby reducing the safety risk of the operation personnel in carrying and operating the "inflatable pipe"; once a blind blast occurs in the liquid oxygen gas explosion, the cracking device has the characteristics of automatically removing the risk of combustion and explosion within a short time (mainly affected by the environmental temperature and the liquid injection amount of the single-hole cracking device, generally about 30 minutes in Guangxi Zhuang Autonomous Region);

[0076] Advantage two, the application has high efficiency. Through a large number of engineering applications, the technology and construction process have been mature, the bench blasting of more than 10 meters can be implemented, the rock breaking amount of one blasting can reach more than 5000 square meters, and large hydraulic hammer cannot knock hard rocks; the application can be used for open-air rock breaking, tunnel excavation, town rock breaking, and gas explosion demolition of bridges and other buildings (structures);

[0077] Advantage three, the application has green environmental protection. Liquid oxygen gas explosion only produces oxygen and a small amount of carbon dioxide, and basically does not produce toxic and harmful gases; liquid oxygen gas explosion has low explosion speed and small intensity, and in addition to breaking rocks to do work, it will not cause excessive crushing of the rock near the blast hole, so the blasting dust is obviously less than that of traditional explosive blasting;

[0078] Advantage four, the application technology and construction process are mature, the engineering application range is wide, especially in special areas or places where the use of explosives is prohibited (or limited), without complicated approval and without the use of civilian explosive materials, the problem of rapid rock breaking can be solved. Moreover, compared with the non-explosive rock breaking methods such as breaking hammer, splitting machine, cement expanding agent and carbon dioxide gas explosion, the efficiency is higher, the cost is lower, and the superiority is more. It is a truly safe, efficient, green and environmentally friendly new blasting rock breaking technology and method.

[0079] And the safety of liquid oxygen gas explosion mainly shows the following characteristics:

[0080] (1) Liquid oxygen gas explosion has high intrinsic safety: ① All objects in the liquid oxygen gas explosion system are free of civilian explosive materials and dangerous chemicals; ② Liquid oxygen gas explosion has no explosion shock wave and very small blasting vibration. Since it is gas expansion, the blasting fly distance can be controlled. The warning distance of explosive blasting is generally not less than 200m, while the warning distance of liquid oxygen blasting is generally 30m;

[0081] (2) The operation safety and public safety are guaranteed. Liquid oxygen gas explosion adopts hole filling technology, and the assembled device outside the hole is free of dangerous materials, so the operation of assembling and loading into the blast hole is safe. After the blast hole is blocked, liquid oxygen is injected into the gas explosion package through the liquid injection pipe network, and the static normal pressure operation is also safe. Moreover, criminals cannot use this liquid oxygen gas explosion package to commit destructive activities;

[0082] (3) Avoid high-risk operation of blind charge treatment. Blind charge in blasting operation is difficult to avoid, and treatment of blind charge is a high-risk operation in blasting operation. If liquid oxygen gas explosion occurs, if it is not ignited for a period of time (the specific time is different due to different environmental temperature, liquid oxygen gas explosion package liquid volume, rock properties and other factors, generally about 30 minutes), the liquid oxygen in the blast hole will quickly vaporize due to the absorption of heat from the surrounding medium, the pressure in the hole will quickly rise, and the gaseous oxygen will quickly discharge from the exhaust pipe of the blast hole. The oxygen concentration in the blast hole is quickly reduced, and the ignition will not have the ability to burn and explode. Therefore, the blind charge of liquid oxygen gas explosion has the characteristics of automatic risk removal.

[0083] The injection branch pipe 10 is cut according to the hole depth of the blast hole, the length of the injection branch pipe 10 is greater than the hole depth of the blast hole by more than 1 m, a plurality of through injection holes are drilled on the injection branch pipe 10 at equal intervals, the interval between adjacent through injection holes is 40-60 cm, a plurality of special paper cores 11-5 are arranged on the injection branch pipe 10, at least two electric ignition heads are respectively and separately arranged on the special paper cores 11-5 at intervals, and the electric ignition heads are connected.

[0084] As shown in Figures 5 to 10 In one embodiment, in step 1, a plurality of blast holes are drilled at a predetermined position of the target rock by a drilling device, the drilling device includes a moving trolley 20 and a drilling assembly 21 mounted on the moving trolley 20 through a lifting assembly, the lifting assembly includes an upper lifting plate 22 and a lower lifting plate 23 arranged one above the other, the lower lifting plate 23 is mounted on the top end of the moving trolley 20 through a pad, the drilling assembly 21 is mounted on the upper lifting plate 22, two groups of lifting cylinders 24 are symmetrically connected between the upper lifting plate 22 and the lower lifting plate 23 with the drilling assembly 21 as the center, the drilling assembly 21 includes a fixed seat 25 connected with the upper lifting plate 22, a drilling motor 26 located in the fixed seat 25, and a main drill bit 27 mounted on the output end of the drilling motor 26, the main drill bit 27 penetrates the lower lifting plate 23, the pad and the moving trolley 20 in sequence, a fixed sleeve 28 is rotatably mounted on a rotating shell 29, and the fixed sleeve 28 is sleeved on the output end of the drilling motor 26.

[0085] The working principle and beneficial effects of the above technical solution are:

[0086] The moving trolley 20 moves to the predetermined position of the target rock, the lifting cylinders 24 are contracted, thereby driving the drilling assembly 21 to project out of the lifting plate 23, the pad and the moving trolley 20, the drilling motor 26 in the fixed seat 25 works, thereby driving the rotating shell 29 and the main drill bit 27 mounted thereon to work synchronously, and the main drill bit 27 completes the hole drilling operation of the target rock.

[0087] In one embodiment, the fixed sleeve 28 is connected with the fixed seat 25, an inner fixed plate 30 is fixedly mounted on the inner wall of the rotating shell 29, an inner sliding plate 31 is slidingly mounted on the inner wall of the rotating shell 29, the fixed sleeve 28 penetrates the inner fixed plate 30 and the inner sliding plate 31, a return spring 16 is sleeved on the fixed sleeve 28 and connected between the inner fixed plate 30 and the inner sliding plate 31, four screw blocks 32 form a ring structure, an outer thread is formed on the fixed sleeve 28 and matched with the screw blocks 32, a fixed frame 33 is connected between the output end of the drilling motor 26 and the inner wall of the rotating shell 29, the screw blocks 32 are resettable mounted on the inner sliding plate 31, four cutting plates 34 form a tubular structure and are connected with the screw blocks 32 one by one through connecting rods 35, and the fixed sleeve 28 is provided with a ring-shaped top block 36 matched with the screw blocks 32 at the end away from the fixed seat 25.

[0088] The working principle and beneficial effects of the above technical solution are:

[0089] With the continuous contraction of the lifting cylinder 24, the depth of the hole drilled by the main drill bit 27 is deepened, and the stone chips in the blast hole are rotated out along the surface of the main drill bit 27 (i.e. the stone chips move from the head of the main drill bit 27 to the root of the main drill bit 27), and if the humidity is large, part of the stone chips will be bonded to the root of the main drill bit 27, at this time, because the rotating shell 29 and the main drill bit 27 rotate synchronously, the rotating shell 29 drives the inner sliding plate 31 and the inner fixed plate 30 on the inner wall thereof to rotate synchronously, and the four screw blocks 32 on the inner sliding plate 31 form a ring structure and cooperate with the external threads opened on the fixed sleeve 28, thereby driving the inner sliding plate 31 to act in the stretching direction of the return spring 16, the screw blocks 32 drive the cutting plate 34 to act towards the root of the main drill bit 27 through the connecting rod 35, thereby removing the stone chips bonded to the root of the main drill bit 27, to prevent too many stone chips from gathering at the root of the main drill bit 27, and with the annular top block 36 expanding the ring structure formed by the four screw blocks 32, the ring structure formed by the four screw blocks 32 is disengaged from the cooperation with the external threads opened on the fixed sleeve 28, and under the contraction of the return spring 16, the inner sliding plate 31 is reset and repeatedly acts in the stretching direction of the return spring 16.

[0090] When the drilling motor 26 in the fixed seat 25 is working, because the fixed sleeve 28 is fixedly connected with the fixed seat 25, both of them do not act, and the output end of the drilling motor 26 and the rotating shell 29 connected with the output end of the drilling motor 26 through the fixed frame 33 rotate synchronously, so that the rotating shell 29 rotates around the fixed sleeve 28 as the center.

[0091] In an embodiment, the side fixed shell 37 is embeddedly installed at the side end of the rotating shell 29, the side rotating shaft 38 is rotatably installed on the side fixed shell 37, one end of the side rotating shaft 38 extends into the rotating shell 29 and is connected with the fixed sleeve 28 through a pair of engaged bevel gears 39, the other end of the side rotating shaft 38 is provided with a rotating rod 40, the rotating rod 40 is provided with a push block 41, the push block 41 is slidingly connected in a transmission frame 42, a spraying box 43 is fixedly installed at the side end of the rotating shell 29, an elastic capsule 44 is installed in the spraying box 43, a spraying head 45 provided with a one-way valve is installed on the spraying box 43 and connected with the elastic capsule 44, a pressing plate 46 is located in the spraying box 43 and presses the elastic capsule 44, one end of a vertical rod 47 is connected with the transmission frame 42, the other end of the vertical rod 47 extends into the spraying box 43 and is connected with the pressing plate 46, and the side fixed shell 37 is provided with a blowing blade 48 installed on the side rotating shaft 38.

[0092] The working principle and beneficial effects of the above technical solution are:

[0093] When the rotating shell 29 rotates with the fixed sleeve 28 as the center, the side fixed shell 37 mounted on the rotating shell 29, the side rotating shaft 38 mounted on the side fixed shell 37 rotate through the engagement of a bevel gear 39, the side rotating shaft 38 drives the air blowing blades 48 mounted thereon and located in the side fixed shell 37 to work, thereby sending air into the rotating shell 29 communicated with the side fixed shell 37 and blowing out from the bottom of the rotating shell 29, and further playing a role of dust reduction, and the rotating rod 40 mounted on the side rotating shaft 38, the block 41 mounted on the rotating rod 40 and the transmission frame 42 cooperate to drive the vertical rod 47 connected with the transmission frame 42, the pressing plate 46 connected with the vertical rod 47 to periodically press the elastic capsule 44 in the spraying box 43, thereby spraying the water in the elastic capsule 44 from the spraying head 45, so that, because the spraying head 45 also rotates with the fixed sleeve 28 as the center, the spraying range of the spraying head 45 is expanded, and the water mist sprayed from the spraying head 45 flows along the airflow blown out from the bottom of the rotating shell 29, thereby enhancing the directionality of the water mist and playing a good role of dust reduction.

[0094] Obviously, the above embodiments are only examples for clearly illustrating the present application, and are not intended to limit the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments are not required to be exhausted, and the changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A method for operating liquid oxygen explosion, applied to a liquid oxygen explosion system, characterized in that, The method comprises the following steps: Step 1, a plurality of blast holes are formed at a preset position of the target rock; Step 2, the fracturing device is assembled and placed in the blast hole, the liquid injection branch pipe, the exhaust pipe and the electric ignition wire pipeline bundle are extended out of the blast hole orifice by at least 50 cm, and the blast hole is filled; Step 3, the liquid injection main pipe network for connecting the liquid injection main pipe and the Dewar flask is formed by connecting the large three-way pipe and the straight pipe, and each fracturing device and the high-energy pulse initiator are connected in series through the detonation network; Step 4, the gas explosion is prewarned, the gas explosion area is cleared, the pressurizing valve and the liquid injection valve are sequentially opened to inject liquid oxygen, the Dewar flask is pressurized, the liquid oxygen flows in the liquid injection main pipe network, and is injected into the fracturing device through the liquid injection branch pipe, after the fracturing device is filled, the pressurizing valve and the liquid injection valve are closed, the liquid injection main pipe network is disconnected, the liquid injection main pipe and the hose are retrieved, and the Dewar flask is covered and protected; Step 5, the high-energy pulse initiator is used by the blaster to initiate each fracturing device, and after the blast smoke is dissipated, it is checked whether there is a blind shot; The liquid oxygen gas explosion system comprises a liquid oxygen supply unit, a main pipe and a plurality of liquid injection main pipes connected in sequence, a plurality of liquid oxygen blasting units are distributed on each liquid injection main pipe, and an electric initiation unit connected with each liquid oxygen blasting unit. The liquid oxygen supply unit comprises a Dewar flask, a pressurizing valve and a liquid injection valve mounted on the Dewar flask, and the liquid injection valve is connected with the main pipe through a high-pressure metal hose; The liquid oxygen blasting unit comprises a liquid injection branch pipe connected with the liquid injection main pipe through a small three-way pipe, a fracturing device connected with the liquid injection branch pipe, the fracturing device comprises a shell, the liquid injection branch pipe extends into the shell, a plurality of special paper cores are arranged in the shell and sleeved on the liquid injection branch pipe, an electric ignition head connected with the electric initiation unit is mounted on the shell, and an exhaust pipe is mounted on the wire bundle pipe for penetrating the electric ignition head; In step 1, a plurality of blast holes are formed at a preset position of the target rock by a drilling device, the drilling device comprises a moving trolley and a drilling assembly mounted on the moving trolley through a lifting assembly, the lifting assembly comprises an upper lifting plate and a lower lifting plate arranged one above the other, the lower lifting plate is mounted on the top end of the moving trolley through a pad plate, the drilling assembly is mounted on the upper lifting plate, two groups of lifting cylinders are symmetrically connected between the upper lifting plate and the lower lifting plate with the drilling assembly as the center, the drilling assembly comprises a fixed seat connected with the upper lifting plate, a drilling motor located in the fixed seat and a main drill bit mounted on the output end of the drilling motor, the main drill bit penetrates the lower lifting plate, the pad plate and the moving trolley in sequence, a fixed sleeve is rotatably mounted on the rotating shell, and the fixed sleeve is sleeved on the output end of the drilling motor; The fixed sleeve is connected with the fixed seat, an inner fixed plate is fixedly mounted on the inner wall of the rotating shell, an inner sliding plate is slidably mounted on the inner wall of the rotating shell, the fixed sleeve penetrates the inner fixed plate and the inner sliding plate, a return spring is sleeved on the fixed sleeve and connected between the inner fixed plate and the inner sliding plate, four screw blocks form a ring structure, an outer thread is formed on the fixed sleeve and matched with the screw blocks, a fixed frame is connected between the output end of the drilling motor and the inner wall of the rotating shell, the screw blocks are resettable mounted on the inner sliding plate, four cutting plates form a tubular structure and are connected with the screw blocks one by one through connecting rods, and the fixed sleeve away from the fixed seat end is provided with a ring-shaped top block matched with the screw blocks.

2. A method of operating a liquid oxygen gas generator as defined in claim 1, wherein The mother pipe is a steel pipe with both ends blocked, the inner diameter of the mother pipe is larger than the high-pressure metal hose, the inner diameter of the mother pipe is 15-20 mm, the outer surface of the mother pipe is wrapped with multiple temperature insulation layers, the mother pipe is provided with a liquid inlet connected with the high-pressure metal hose and a liquid outlet connected with each liquid injection main pipe.

3. A method of operating a liquid oxygen gas generator as defined in claim 1, wherein The liquid injection main pipe is an aluminum material round pipe, the inner diameter of the liquid injection main pipe is 8-10 mm, at least three liquid injection main pipes are connected with the mother pipe and form a closed loop liquid injection main pipe network through a large three-way pipe and a straight-through connection.

4. The method of claim 1, wherein, The liquid injection branch pipe is an aluminum material round pipe, the inner diameter of the liquid injection branch pipe is 6-8 mm, the height of the special paper core is 200-500 mm, and the diameter is 70-120 mm.

5. The method of claim 1, wherein, The electric detonation unit comprises a high-energy pulse initiator, a connecting end of the high-energy pulse initiator is connected with each liquid oxygen blasting unit through a detonation network, the detonation network comprises an electric ignition head, a foot wire, a connection wire between blast holes, and a detonation bus.

6. The method of claim 1, wherein, The side fixed shell is embedded and installed at the side end of the rotating shell, the side rotating shaft is rotatably installed on the side fixed shell, one end of the side rotating shaft extends into the rotating shell and is connected with the fixed sleeve through a pair of meshing bevel gears, the other end of the side rotating shaft is provided with a rotating rod, the rotating rod is provided with a shifting block, the shifting block is slidingly connected in the transmission frame, the spraying box is fixedly installed at the side end of the rotating shell, the elastic bag body is installed in the spraying box, the spraying head with a one-way valve is installed on the spraying box and is connected with the elastic bag body, the pressing plate is located in the spraying box and presses the elastic bag body, one end of the vertical rod is connected with the transmission frame, the other end of the vertical rod extends into the spraying box and is connected with the pressing plate, the side fixed shell is provided with a blowing blade installed on the side rotating shaft.

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