CN117259908A - Oxyhydrogen flame cutting method and oxyhydrogen flame cutting system - Google Patents
Oxyhydrogen flame cutting method and oxyhydrogen flame cutting system Download PDFInfo
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- CN117259908A CN117259908A CN202311557513.8A CN202311557513A CN117259908A CN 117259908 A CN117259908 A CN 117259908A CN 202311557513 A CN202311557513 A CN 202311557513A CN 117259908 A CN117259908 A CN 117259908A
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- 238000005520 cutting process Methods 0.000 title claims abstract description 146
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000007789 gas Substances 0.000 claims abstract description 125
- 239000001301 oxygen Substances 0.000 claims abstract description 37
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 37
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000005496 tempering Methods 0.000 claims abstract description 12
- 230000005855 radiation Effects 0.000 claims abstract description 11
- 238000002485 combustion reaction Methods 0.000 claims abstract description 7
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 230000001276 controlling effect Effects 0.000 claims description 6
- 150000001335 aliphatic alkanes Chemical class 0.000 claims description 4
- 230000002441 reversible effect Effects 0.000 claims description 2
- 238000009749 continuous casting Methods 0.000 abstract description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 239000002699 waste material Substances 0.000 abstract description 7
- 229910000831 Steel Inorganic materials 0.000 description 10
- 239000010959 steel Substances 0.000 description 10
- 239000001257 hydrogen Substances 0.000 description 5
- 229910052739 hydrogen Inorganic materials 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000010926 purge Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 206010016754 Flashback Diseases 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 239000003915 liquefied petroleum gas Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K7/00—Cutting, scarfing, or desurfacing by applying flames
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K7/00—Cutting, scarfing, or desurfacing by applying flames
- B23K7/10—Auxiliary devices, e.g. for guiding or supporting the torch
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/38—Torches, e.g. for brazing or heating
- F23D14/42—Torches, e.g. for brazing or heating for cutting
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses an oxyhydrogen flame cut-off cutting method and a cutting system thereof, which belong to the technical field of continuous casting billet production and comprise the following contents: s1, preheating a workpiece before cutting to reach the temperature required by oxyhydrogen flame ignition, and igniting by heat radiation of the workpiece; s2, opening a first auxiliary valve, an oxyhydrogen valve and a cutting oxygen valve, performing cutting operation on a workpiece after ignition, and controlling auxiliary gas by using the first auxiliary valve to reduce the combustion speed and tempering probability of oxyhydrogen; s3, after the cutting operation is finished, sequentially closing the cutting oxygen valve, the oxyhydrogen valve and the first auxiliary air valve to realize fire breaking; and S4, re-igniting when the cutting operation is performed again, and performing the flameout after the cutting operation is finished, and repeating the ignition and the flameout until the processing is stopped. The invention reduces the burning speed and tempering probability of oxyhydrogen gas by introducing auxiliary gas, and simultaneously, utilizes the complete flameout of the non-cutting time period during the oxyhydrogen flame cutting to avoid the energy waste and the equipment loss caused by the non-flameout cutting mode.
Description
Technical Field
The invention relates to the technical field of continuous casting billet production, in particular to an oxyhydrogen flame cutoff cutting method and an oxyhydrogen flame cutoff cutting system.
Background
In the cutting operation of continuous casting billets, oxyhydrogen flame is often adopted to cut steel or continuous casting billets, and the oxyhydrogen flame is concentrated, so that the use is more convenient. However, because the oxyhydrogen flame burns fast, when the oxyhydrogen mixed gas is turned off, the flow rate of oxyhydrogen gas in the oxyhydrogen main pipe is lower than the burning speed, and tempering phenomenon can occur, so that danger is caused.
In order to prevent the danger caused by tempering, a continuous fire mode is adopted at present, namely, when oxyhydrogen flame is used for cutting steel materials by an automatic cutting machine tool or cutting continuous casting billets, whether the oxyhydrogen flame is used for cutting operation or clearance time of cutting, the oxyhydrogen flame is always in a continuous fire burning state. This prevents the risk of flashback, but wastes energy and increases cutting costs. In addition, the cutting nozzle of the cutting gun is in an ignition state for a long time, is not durable and is frequently replaced; the equipment runs under long-term load, the equipment failure rate is high, the maintenance cost is high, and the maintenance workload is increased; once the air source equipment is in fault, the steel billet can be cut manually, so that the working strength of operators is greatly increased, and the quality of the steel billet is also affected.
In the proposal, in order to prevent backfire, oxyhydrogen flame is blown out by alkane gas to realize the cutoff cutting of a cutting gap, however, the proposal is called a cutoff cutting method, and only the air supply of a main way is actually cut off, an auxiliary air bypass valve is always in a normally open state, a flame which does not cutoff is kept, and a pilot flame is still kept. The working mode is suitable for the old continuous casting billet production line, and has low pulling speed and unstable billet temperature.
At present, the metallurgical industry rapidly develops, the continuous casting production line of the steel industry has high drawing speed, and the steel billet is high to 800 ℃ or even above. In the state of the metallurgical industry at present, whether a better energy-saving solution can be adopted is a technical problem faced by the person skilled in the art.
Disclosure of Invention
The invention aims to provide an oxyhydrogen flame cutoff cutting method and an oxyhydrogen flame cutoff cutting system, which solve the problems in the prior art, reduce the burning speed and tempering probability of oxyhydrogen gas by introducing auxiliary gas, and simultaneously utilize the heat radiation of a workpiece to ignite oxyhydrogen flame, so that complete cutoff of a non-cutting time period during cutting by utilizing oxyhydrogen flame can be realized, and energy waste and equipment loss caused by a non-cutoff cutting mode are avoided.
In order to achieve the above object, the present invention provides the following solutions:
the invention provides an oxyhydrogen flame cut-off method, which comprises the following steps:
s1, preheating a workpiece before cutting to reach the temperature required by oxyhydrogen flame ignition, and igniting by heat radiation of the workpiece;
s2, opening a first auxiliary gas valve, an oxyhydrogen gas valve and a cutting oxygen valve, performing cutting operation on the workpiece after ignition, and controlling auxiliary gas by using the first auxiliary gas valve to reduce the combustion speed and tempering probability of oxyhydrogen gas;
s3, after the cutting operation is finished, sequentially closing the cutting oxygen valve, the oxyhydrogen valve and the first auxiliary air valve to realize fire cutoff;
and S4, re-igniting when the cutting operation is performed again, and performing the flameout after the cutting operation is finished, and repeating the ignition and the flameout until the processing is stopped.
Preferably, step S2.1 and step S2.2 are included between step S2 and step S3:
s2.1, closing the first auxiliary air valve after the workpiece is preheated to finish a drainage opening, and performing cutting operation;
and S2.2, when the workpiece cutting is about to be completed, opening the first auxiliary air valve again.
Preferably, the auxiliary gas controlled by the first auxiliary gas valve adopts alkane gas.
Preferably, in step S3, when the workpiece cutting is about to be completed, the first auxiliary air valve is closed, the second auxiliary air valve is opened, the oxyhydrogen gas in the pipeline behind the oxyhydrogen gas valve is purged to the cutting gun, then the oxyhydrogen gas valve is closed, and the cutting oxygen valve is closed.
Preferably, the auxiliary gas controlled by the second auxiliary gas valve adopts non-combustible gas.
Preferably, in step S2, when the first auxiliary gas valve and the oxyhydrogen gas valve are opened, the first auxiliary gas valve and the oxyhydrogen gas valve are simultaneously opened or sequentially opened or opened in reverse order.
Preferably, in step S1, when the workpiece cannot reach the temperature required by oxyhydrogen flame ignition, the oxyhydrogen gas bypass pipe and the auxiliary gas bypass pipe are opened, the continuous supply of oxyhydrogen gas is maintained, and the cutting gun is not broken.
The invention also provides a cutting system for the oxyhydrogen flame cutoff cutting method, which comprises an oxyhydrogen main pipe, a first auxiliary air pipe and a cutting oxygen pipe, wherein the oxyhydrogen main pipe and the first auxiliary air pipe are communicated through a first three-way pipe and then are gathered to a mixing pipe for output, the mixing pipe and the cutting oxygen pipe are communicated with a cutting gun together, an oxyhydrogen valve is arranged on the oxyhydrogen main pipe, a first auxiliary air valve is arranged on the first auxiliary air pipe, a cutting oxygen valve is arranged on the cutting oxygen pipe, and the oxyhydrogen valve, the first auxiliary air valve and the cutting oxygen valve are electrically connected with a controller.
Preferably, the hydrogen and oxygen pipeline collecting device comprises a second auxiliary air pipe and a stop valve, wherein the second auxiliary air pipe is communicated with the hydrogen and oxygen main pipe in a collecting way through a second three-way pipe, the collected pipelines are communicated to the first three-way pipe, the second auxiliary air pipe is provided with the second auxiliary air valve, the second auxiliary air valve is electrically connected with the controller, and the stop valve is arranged on the hydrogen and oxygen main pipe and is positioned in front of the hydrogen and oxygen valve.
Preferably, the oxyhydrogen valve is provided with an oxyhydrogen bypass pipe in parallel, and the oxyhydrogen bypass pipe is provided with an oxyhydrogen regulating valve; the first auxiliary gas valve is provided with an auxiliary gas bypass pipe in parallel connection, and the auxiliary gas bypass pipe is provided with an auxiliary gas regulating valve.
Compared with the prior art, the invention has the following technical effects:
according to the invention, the first auxiliary air valve is used for controlling the auxiliary air to be introduced, so that the combustion speed and tempering probability of oxyhydrogen gas are reduced, on the basis, the oxyhydrogen flame is ignited by utilizing the heat radiation of the workpiece, the complete flameout of the non-cutting time period during the cutting by utilizing the oxyhydrogen flame can be realized, the energy waste and the equipment loss caused by the non-flameout cutting form are avoided, and the energy-saving and environment-friendly effects are achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the gas circuit structure of the present invention;
wherein, 1, an auxiliary gas regulating valve; 2. an auxiliary gas bypass pipe; 3. a first auxiliary air pipe; 4. an oxyhydrogen valve; 5. a oxyhydrogen gas main pipe; 6. a hydrogen-oxygen bypass pipe; 7. an oxyhydrogen gas regulating valve; 8. a controller; 9. cutting an oxygen valve; 10. cutting an oxygen pipe; 11. a first tee; 12. a stop valve; 13. a mixing tube; 14. a cutting gun; 15. a first auxiliary gas valve; 16. a second auxiliary air pipe; 17. a second auxiliary gas valve; 18. and a second three-way pipe.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide an oxyhydrogen flame cutoff cutting method and an oxyhydrogen flame cutoff cutting system, which are used for solving the problems in the prior art, reducing the combustion speed and tempering probability of oxyhydrogen gas by introducing auxiliary gas, simultaneously igniting oxyhydrogen flame by utilizing heat radiation of a workpiece, realizing complete cutoff of a non-cutting time period during cutting by utilizing oxyhydrogen flame, and avoiding energy waste and equipment loss caused by a non-cutoff cutting mode.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
The existing working mode of the oxyhydrogen flame cutting is continued to be a former cutting mode without cutting off fire, and the cutting mode keeps the air supply of the bypass pipeline for carrying out incomplete cutting off fire by cutting off the air supply of the main pipeline, and the ventilation quantity of the main pipeline is reduced, the burning intensity of flame is reduced, the energy consumption is reduced to a certain extent, and the small fire which smoothly ignites the main fire is always kept open. The working mode is based on the working mode of the traditional old continuous casting steel billet production line, and the old production line has the characteristics of low pulling speed, unstable steel billet temperature and the like, and can only ignite main fire by means of continuous fire. With the rapid development of the metallurgical industry, the continuous casting production line in the steel industry has high pulling speed, and the billet temperature is up to 800 ℃ or even above, and the invention can directly ignite by the heat radiation of the temperature of the billet.
Specifically, as shown in fig. 1, the invention provides an oxyhydrogen flame cutoff cutting method, which comprises the following steps:
s1, preheating a workpiece (mainly a steel billet or other workpieces which need to be cut and can be preheated at high temperature) before cutting, reaching the temperature required by oxyhydrogen flame ignition, transmitting heat radiation of the workpiece to a cutting gun 14, and igniting oxyhydrogen gas discharged by the cutting gun 14 to perform ignition.
S2, before cutting operation, opening a first auxiliary air valve 15, an oxyhydrogen valve 4 and a cutting oxygen valve 9, supplying mixed gas of hydrogen, oxygen and auxiliary gas to a cutting gun 14, igniting by using heat radiation of a workpiece, and then cutting the workpiece, wherein the first auxiliary air valve 15 controls the feeding of auxiliary gas, and the fed auxiliary gas can reduce the burning speed and tempering probability of oxyhydrogen.
And S3, after the cutting operation is finished, sequentially closing the cutting oxygen valve 9, the oxyhydrogen valve 4 and the first auxiliary air valve 15, realizing the cutoff of fire, waiting for the opening of the next cutting operation, and not consuming the oxyhydrogen because the cutoff of fire is completed at the moment.
And S4, when the cutting operation is performed again, the heat radiation of the workpiece is reused for ignition, after the cutting operation is finished again, each valve is closed in sequence to perform the flameout according to the sequence, and the ignition and the flameout are repeated until the machining is stopped.
According to the invention, the first auxiliary gas valve 15 is used for controlling the auxiliary gas to be introduced, so that the combustion speed and tempering probability of oxyhydrogen gas are reduced, on the basis, the oxyhydrogen flame is ignited by utilizing the heat radiation of the workpiece, the complete flameout of the non-cutting time period during the cutting of the oxyhydrogen flame can be realized, the main path and the bypass pipeline are cut off, the energy waste and the equipment loss caused by the non-flameout cutting form are avoided, and the energy-saving and environment-friendly effects are achieved. The oxyhydrogen flame cutting seam can keep the advantages of narrow cutting seam and smooth cutting seam, so that the consumption of oxyhydrogen gas and energy source can be reduced in the period to be cut, the service life of the oxyhydrogen generator can be prolonged, and the safety and reliability of re-ignition can be ensured.
Further, step S2.1 and step S2.2 may be included between step S2 and step S3:
s2.1, after the workpiece is preheated and the drainage opening is finished, closing the first auxiliary air valve 15 to perform cutting operation, wherein no auxiliary air is introduced into the cutting gun 14, and oxyhydrogen flame is completely adopted for cutting, so that the cutting efficiency is high;
and S2.2, when the workpiece cutting is about to be completed, opening the first auxiliary air valve 15 again so as to introduce auxiliary air before the cutoff of fire, and reducing the combustion speed and tempering probability of oxyhydrogen by using the auxiliary air.
The auxiliary gas controlled by the first auxiliary gas valve 15 may be an alkane gas, which includes propane, natural gas, coke oven gas and/or acetylene, or other liquefied petroleum gas.
In addition, in the other way of stopping the fire, in step S3, when the workpiece is about to be cut, the first auxiliary air valve 15 may be closed, the second auxiliary air valve 17 may be opened, and the second auxiliary air valve 17 may be used to control the supply of another auxiliary air, which may purge the oxyhydrogen gas in the pipeline behind the oxyhydrogen valve 4 to the cutting gun 14, replace the oxyhydrogen gas with a non-flammable gas, so as to prevent backfire when the flame is closed, close the oxyhydrogen valve 4 immediately after the purging is completed, and simultaneously close the cutting oxygen valve 9 to perform the fire stopping. In order to prevent the secondary gas from flowing back into the oxyhydrogen gas main pipe 5, a shutoff valve 12 may be provided on the oxyhydrogen gas main pipe 5.
The secondary gas controlled by the second secondary gas valve 17 may be a non-combustible gas including nitrogen, compressed air, and/or oxygen, etc.
It should be noted that: the sequence of opening the first auxiliary valve 15 and the oxyhydrogen valve 4 in step S2 is not specifically required, and may be simultaneously opened, or may be performed in the sequence of opening the first auxiliary valve 15 and then opening the oxyhydrogen valve 4, or in the sequence of opening the oxyhydrogen valve 4 and then opening the first auxiliary valve 15.
In step S1, when the workpiece cannot reach the temperature required for oxyhydrogen flame ignition, for example, under the following conditions: 1) Producing a large blank, and producing a continuous casting billet with the pulling speed lower than 0.5m/min and the cutting surface temperature lower than 500 ℃; 2) When the temperature of the billet is lower before casting in continuous casting production; 3) Cutting the numerical control cold plate. Under the working conditions, when the supply of the main oxyhydrogen gas is disconnected, the oxyhydrogen gas bypass pipe 6 and the auxiliary gas bypass pipe 2 are opened, the continuous supply of the oxyhydrogen gas is kept, the cutting gun 14 is not broken, and the long-term open flame is kept.
Referring to fig. 1 again, the invention further provides a cutting system for the oxyhydrogen flame cutoff cutting method as described above, which comprises an oxyhydrogen gas main pipe 5, a first auxiliary gas pipe 3 and a cutting oxygen gas pipe 10, wherein the oxyhydrogen gas main pipe 5 and the first auxiliary gas pipe 3 are connected with two through holes of a first three-way pipe 11, and the other through hole of the first three-way pipe 11 is connected with a mixing pipe 13, namely the oxyhydrogen gas main pipe 5 and the first auxiliary gas pipe 3 are communicated through the first three-way pipe 11 and then are gathered into the mixing pipe 13 for output. The mixing pipe 13 is communicated with the cutting gun 14 together with the cutting oxygen pipe 10, and the cutting gun 14 discharges the mixed cutting gas which can be directly ignited and can be cut after ignition. The oxyhydrogen gas main pipe 5 is provided with an oxyhydrogen gas valve 4, the first auxiliary gas pipe 3 is provided with a first auxiliary gas valve 15, the cutting oxygen pipe 10 is provided with a cutting oxygen valve 9, the oxyhydrogen gas valve 4, the first auxiliary gas valve 15 and the cutting oxygen valve 9 are electrically connected with the controller 8, and the opening and closing of each valve can be controlled through the controller 8, so that the introducing state of each gas is controlled.
The hydrogen-oxygen main pipe comprises a second auxiliary air pipe 16 and a stop valve 12, wherein the second auxiliary air pipe 16 is communicated with the hydrogen-oxygen main pipe 5 in a converging way through a second three-way pipe 18, and the converged pipeline is communicated to the first three-way pipe 11. The second auxiliary air pipe 16 is provided with a second auxiliary air valve 17, the second auxiliary air valve 17 is electrically connected with the controller 8, the controller 8 is used for controlling the opening and closing of the second auxiliary air valve 17, and the oxyhydrogen in the rear pipeline of the oxyhydrogen valve 4 can be purged to the cutting gun 14 by controlling the second auxiliary air valve 17, so that the non-combustible gas is replaced. The stop valve 12 is arranged at the front position of the oxyhydrogen valve 4 on the oxyhydrogen main pipe 5, and by the arrangement of the stop valve 12, non-combustible gas can be prevented from entering the oxyhydrogen main pipe 5 in the purging process.
The oxyhydrogen valve 4 is provided with the oxyhydrogen bypass pipe 6 in parallel, the oxyhydrogen bypass pipe 6 is provided with the oxyhydrogen regulating valve 7, when the oxyhydrogen main pipe 5 is closed by utilizing the oxyhydrogen valve 4, a small amount of air can be continuously supplied by utilizing the oxyhydrogen bypass pipe 6, the cutting gun 14 is in a non-flameout state, and the requirement that the temperature working condition required by oxyhydrogen flame ignition cannot be achieved by a workpiece is met. The first auxiliary air valve 15 is provided with an auxiliary air bypass pipe 2 in parallel, the auxiliary air bypass pipe 2 is provided with an auxiliary air regulating valve 1, when the first auxiliary air pipe 3 is closed by the first auxiliary air valve 15, a small amount of air can be continuously supplied by the auxiliary air bypass pipe 2, the cutting gun 14 is in a non-flameout state, and the requirement that the workpiece cannot reach the temperature working condition required by oxyhydrogen flame ignition is met.
The cutting system greatly reduces the waste of energy sources, and in the steelmaking continuous casting production, the hydrogen-oxygen generator after the fire cutoff transformation can save more than half of electric quantity and reduce the maintenance cost of equipment; after the flameout transformation, the load operation time of the oxyhydrogen generator is shortened, and the equipment failure rate is reduced, so that the cost of manpower and material resources for maintenance is reduced, and the labor intensity of operators is reduced; after the fire-breaking transformation, the equipment failure rate is reduced, the manual blank cutting times of operators due to the air source problem are greatly reduced, and the problems existing in the prior art in a cutting mode of incomplete fire-breaking can be effectively solved.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (10)
1. The oxyhydrogen flame cutoff cutting method is characterized by comprising the following steps of:
s1, preheating a workpiece before cutting to reach the temperature required by oxyhydrogen flame ignition, and igniting by heat radiation of the workpiece;
s2, opening a first auxiliary gas valve, an oxyhydrogen gas valve and a cutting oxygen valve, performing cutting operation on the workpiece after ignition, and controlling auxiliary gas by using the first auxiliary gas valve to reduce the combustion speed and tempering probability of oxyhydrogen gas;
s3, after the cutting operation is finished, sequentially closing the cutting oxygen valve, the oxyhydrogen valve and the first auxiliary air valve to realize fire cutoff;
and S4, re-igniting when the cutting operation is performed again, and performing the flameout after the cutting operation is finished, and repeating the ignition and the flameout until the processing is stopped.
2. The oxyhydrogen flame cutoff cutting method according to claim 1, wherein step S2 and step S3 include step S2.1 and step S2.2 between step S2 and step S3:
s2.1, closing the first auxiliary air valve after the workpiece is preheated to finish a drainage opening, and performing cutting operation;
and S2.2, when the workpiece cutting is about to be completed, opening the first auxiliary air valve again.
3. The oxyhydrogen flame cutoff cutting method according to claim 1, wherein the auxiliary gas controlled by the first auxiliary gas valve is an alkane gas.
4. The oxyhydrogen flame cutoff cutting method according to claim 1, wherein in step S3, when the workpiece cutting is about to be completed, the first auxiliary gas valve is closed, the second auxiliary gas valve is opened, oxyhydrogen gas in a pipeline behind the oxyhydrogen gas valve is purged to a cutting gun, then the oxyhydrogen gas valve is closed, and the cutting oxygen valve is closed.
5. The oxyhydrogen flame cutoff method according to claim 4, wherein the secondary gas controlled by the second secondary gas valve is a non-combustible gas.
6. The oxyhydrogen flame cutoff method according to claim 1, wherein the first auxiliary valve and the oxyhydrogen valve are opened simultaneously or sequentially or in reverse order in step S2.
7. The oxyhydrogen flame cutoff cutting method according to claim 1, wherein in step S1, when the workpiece cannot reach a temperature required for oxyhydrogen flame ignition, an oxyhydrogen gas bypass pipe and an auxiliary gas bypass pipe are opened to keep continuous supply of oxyhydrogen gas, and a cutting gun is not burned.
8. A cutting system for the oxyhydrogen flame cutoff cutting method according to any one of claims 1 to 7, comprising an oxyhydrogen gas main pipe, a first auxiliary gas pipe and a cutting oxygen pipe, wherein the oxyhydrogen gas main pipe and the first auxiliary gas pipe are communicated through a first three-way pipe and then are converged to a mixing pipe for output, the mixing pipe and the cutting oxygen pipe are communicated with a cutting gun together, an oxyhydrogen gas valve is arranged on the oxyhydrogen gas main pipe, a first auxiliary gas valve is arranged on the first auxiliary gas pipe, a cutting oxygen valve is arranged on the cutting oxygen pipe, and the oxyhydrogen gas valve, the first auxiliary gas valve and the cutting oxygen valve are electrically connected with a controller.
9. The cutting system of claim 8, comprising a second auxiliary air pipe and a stop valve, wherein the second auxiliary air pipe is communicated with the oxyhydrogen gas main pipe in a converging way through a second three-way pipe, the converged pipeline is communicated to the first three-way pipe, the second auxiliary air pipe is provided with a second auxiliary air valve, the second auxiliary air valve is electrically connected with the controller, and the stop valve is arranged on the oxyhydrogen gas main pipe and in front of the oxyhydrogen gas valve.
10. The cutting system of claim 8, wherein the oxyhydrogen gas valve is provided with an oxyhydrogen gas bypass pipe in parallel, and the oxyhydrogen gas bypass pipe is provided with an oxyhydrogen gas regulating valve; the first auxiliary gas valve is provided with an auxiliary gas bypass pipe in parallel connection, and the auxiliary gas bypass pipe is provided with an auxiliary gas regulating valve.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311557513.8A CN117259908A (en) | 2023-11-22 | 2023-11-22 | Oxyhydrogen flame cutting method and oxyhydrogen flame cutting system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311557513.8A CN117259908A (en) | 2023-11-22 | 2023-11-22 | Oxyhydrogen flame cutting method and oxyhydrogen flame cutting system |
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